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JP2005051283

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DESCRIPTION JP2005051283
A speaker device whose thickness can be easily reduced and a method of manufacturing the
same. SOLUTION: A gap positioning portion 620 of an assembly jig 600 is mounted on a
mounting portion 610 in a state of being fitted inside a magnet portion 200 having different
magnetic pole faces on inner and outer side surfaces. The diaphragm 400 in which the voice coil
500 is wound around the substantially cylindrical rising outer periphery in advance is fitted to
the inner periphery of the gap positioning portion 620 with the outer periphery of the voice coil
500. It adheres to the magnet unit 200. The end portion of the outer cylindrical portion 310 of
the magnetic body 300 is fitted to the outer yoke 230 of the magnet portion 200 while the
holding portion 440 is held and bonded. The assembly jig 600 is removed to form the speaker
device 100. In the state where the magnetic body 300 covers the edge portion 430 and enters
the inner peripheral side of the voice coil 500, the thickness can be easily reduced, and the
productivity can be improved. [Selected figure] Figure 4
Speaker apparatus and method of manufacturing the same
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker device that vibrates a diaphragm by means of a voice coil disposed in a magnetic circuit
to produce sound, and a method of manufacturing the same. [0002] Conventionally, speaker
devices can be roughly classified into two types, an internal magnet type and an external magnet
type (see, for example, Patent Document 1). As described also in Patent Document 1, in the
internal magnet type speaker device, a magnet is disposed between a yoke formed in a
substantially plate shape of a magnetic material and a disk-shaped top plate. Then, in the
magnetic gap between the peripheral edge of the yoke and the peripheral edge of the top plate, a
cylindrical voice coil integrally provided on one surface of the diaphragm is axially movably
disposed. On the other hand, in the external magnet type speaker device, there is provided a
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flange portion projecting outward in a flange shape from one end in the axial direction of a
center pole formed in a substantially cylindrical shape of a yoke, and a ring top corresponding to
this flange portion. A ring-shaped magnet is disposed between the plate and the plate. And, in the
magnetic gap between the outer peripheral surface of the center pole of the yoke and the inner
peripheral surface of the top plate, a cylindrical voice coil integrally provided on one surface of
the diaphragm is axially movably disposed. . [Patent Document 1] JP-A-58-53299 (page 3 upper
left column-page 4 lower right column, FIG. 3 and FIG. 6) Problems to be Solved by the Invention
2. Description of the Related Art Portable electronic devices such as mobile phones, personal
handyphone systems (PHS), personal digital assistants (PDAs), and notebook computers in recent
years are widely used, and downsizing and weight reduction of speakers have been attempted.
An object of the present invention is to provide a speaker device whose thickness can be easily
reduced and a method of manufacturing the same in view of the above-described circumstances
and the like. According to a first aspect of the present invention, there is provided a vibration
plate including a magnet, a vibrating portion, and an edge portion provided on a peripheral
portion of the vibrating portion. A voice coil provided integrally and a peripheral portion of the
diaphragm are positioned and held, and is continuous with one magnetic pole surface of the
magnet and covers an edge portion of the diaphragm and is provided over the inner periphery of
the voice coil A magnetic body for forming a magnetic circuit by movably moving the voice coil
in the axial direction with the magnet to form a magnetic circuit. Here, the axial direction means
the thickness direction of the speaker device that is perpendicular to the planar direction of the
diaphragm.
The invention according to claim 21 is a method for manufacturing a speaker device for
manufacturing the speaker device according to any one of claims 1 to 20, wherein the
substantially flat plate shape conforming to the shape of the diaphragm is provided. A state in
which the gap positioning portion of the assembly jig is fitted with the magnet using an assembly
jig provided with the mounting portion and a gap positioning portion provided in a substantially
closed shape on one surface of the mounting portion Placing the voice coil on the gap positioning
portion of the assembly jig on which the magnet is placed, and placing the peripheral portion of
the diaphragm on the magnet; A speaker characterized in that the magnetic body is connected in
a state in which the peripheral portion of the diaphragm is held by the magnet, and the assembly
jig is removed from the side opposite to the connecting side of the connected magnetic body. It is
a manufacturing method of an apparatus. The invention according to claim 22 is characterized in
that the mounting portion has a substantially flat shape, and the thickness dimension of the
mounting portion in the planar direction is predetermined with a predetermined diameter
dimension and a substantially closed shape on one surface of the mounting portion. Using the
assembly jig provided with the gap positioning portion provided in a dimension, the gap
positioning portion of the assembly jig is fitted on the inside of the magnet, and the magnet is
placed on the placing portion, and the magnet is placed. A voice coil is provided in the assembly
jig disposed, and a vibration plate and a vibration plate having an edge portion provided on the
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periphery of the vibration portion are assembled in a state in which the voice coil is fitted to the
gap positioning portion. Further, the peripheral portion is placed on the magnet, and the edge
portion of the diaphragm is covered with the magnet placed on the assembly jig, and the
peripheral portion of the diaphragm is extended to the inner peripheral side of the voice coil.
Holding the magnetic material to connect the magnetic material, It is a manufacturing method of
the speaker apparatus characterized by removing the above-mentioned assembly jig from the
opposite side to the side to connect. BEST MODE FOR CARRYING OUT THE INVENTION A first
embodiment which is an embodiment of a speaker device according to the present invention will
be described below with reference to the drawings. Although this embodiment exemplifies a
small speaker device, it is not limited to this. First Embodiment (Configuration of Speaker Device)
FIG. 1 is a plan view showing a speaker device. FIG. 2 is a side view showing the speaker device.
FIG. 3 is a cross-sectional view showing the speaker device. In FIG. 1 to FIG. 3, reference numeral
100 denotes a speaker device, and the speaker device 100 is particularly applicable to portable
electric devices such as mobile phones, PHS (Personal Handyphone System), PDAs (Personal
Digital Assistant), notebook computers, etc. It is a small device that is used and is a device that
outputs an audio signal by sound generation.
The speaker device 100 includes a magnet unit 200, a magnetic body 300, a diaphragm 400,
and a voice coil 500. The magnet unit 200 includes a magnet body 210, an inner yoke 220, and
an outer yoke 230. The magnet main body 210 is formed in a substantially ring shape of a
magnetic material, and different magnetic pole surfaces are formed on the inner peripheral
surface and the outer peripheral surface. That is, the magnet main body 210 is magnetized, for
example, in a state in which the inner circumferential surface is N pole and the outer
circumferential surface is S pole. The magnet unit 200 and the magnetic body 300 constitute a
magnetic circuit. The inner yoke 220 is formed in a substantially ring shape, for example, by a
magnetic material such as a steel plate mainly composed of iron. The inner yoke 220 has an axial
dimension substantially equal to or slightly longer than that of the magnet body 210, and one
end face in the axial direction is flush with or slightly offset from one end face of the magnet
body 210. It is fitted and fixed to the inner peripheral surface of the magnet main body 210 in
the state. The inner yoke 220 may be integrally joined to the magnet body 210 with an adhesive
or the like. Similar to the inner yoke 220, the outer yoke 230 is formed in a substantially ring
shape of a magnetic material. The outer yoke 230 has an outer peripheral fitting portion 231
whose inner diameter is substantially the same as the outer diameter of the magnet body 210. At
one axial end of the outer peripheral fitting portion 231, a flange portion 232 which protrudes
outward in a bowl shape is bent and formed in series. Further, at the outer peripheral edge of the
flange portion 232, a positioning fitting portion 233 which is formed in a cylindrical shape
coaxially with the outer peripheral fitting portion 231 is bent and formed in series. The outer
yoke 230 has one end face in the axial direction opposite to the side on which the flange portion
232 is provided flush with one end face in the axial direction of the magnet main body 210 or is
slightly offset in the axial direction. The magnet unit 200 is assembled and formed integrally as it
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is assembled in a state of fitting and fixing 210 on the inner circumferential surface. The magnet
portion 200 is in a state where a magnetic pole surface, that is, an N pole is formed on the inner
peripheral surface of the inner yoke 220. The outer yoke 230 may be integrally joined to the
magnet body 210 with an adhesive or the like. The magnetic body 300 is formed in a
substantially ring shape of a magnetic material, as in the case of the inner yoke 220 and the
outer yoke 230, for example. The magnetic body 300 has an outer cylindrical portion 310 as an
outer frame portion formed in a substantially cylindrical shape having substantially the same size
as the inner diameter of the positioning fitting portion 233 of the outer yoke 230.
At one end in the axial direction of the outer cylindrical portion 310, a bridge portion 320 which
is bent to the inner peripheral side in a substantially arc shape is formed in series. Furthermore,
on the inner peripheral edge of the bridge portion 320, an inner cylindrical portion 330 as an
inner frame portion formed in a substantially cylindrical shape whose outer diameter is smaller
than the inner diameter of the inner yoke 220 of the magnet portion 200 by a predetermined
dimension It is bent and formed. Further, a plurality of substantially circular through holes 321
may be formed in the bridge portion 320. The end face of the magnetic body 300 opposite to the
side where the bridge portion 320 of the outer cylindrical portion 310 is provided is in contact
with the flange portion 232 of the outer yoke 230 of the magnet portion 200, and the outer
cylindrical portion 310 In a state of being fitted to the positioning fitting portion 233 of the outer
yoke 230 of the magnet unit 200, they are connected by an adhesive or the like. In addition, you
may connect not only by adhesion ¦ attachment by an adhesive agent but making it engage ¦
engage and connect the claw part formed by cutting and joining, joining by welding, etc. In a
state where the magnetic body 300 is connected to the outer yoke 230 of the magnet unit 200,
the outer circumferential surface of the inner cylindrical portion 330 faces the inner
circumferential surface of the inner yoke 220 via the magnetic gap G having a predetermined
gap size, A magnetic pole surface, that is, an S pole is formed on the outer peripheral surface of
the inner cylindrical portion 330 to form a magnetic circuit. The diaphragm 400 is formed
substantially in the shape of a thin film, for example, of a magnesium thin plate or a resin film
whose surface has been subjected to a corrosion resistance treatment, and has a curved vibrating
portion 410 in the approximate center. On the periphery of the vibrating portion 410, a
substantially cylindrical standing portion 420 is bent and formed in series on the side opposite to
the side where the vibrating portion 410 is curved. The rising portion 420 is formed such that
the inner diameter is larger than the outer diameter of the inner cylindrical portion 330 of the
magnetic body, and the outer diameter is smaller than the inner diameter of the inner yoke 220
of the magnet portion 200. Further, at one axial end of the rising portion 420, a curved edge
portion 430 curved in the same direction as the vibrating portion 410 in the outer peripheral
direction is bent in a series of arcs. Further, at the outer peripheral edge of the edge portion 430,
a holding portion 440 which protrudes outward in a bowl shape is bent and formed in series. The
diameter of the diaphragm 400 is substantially the same as the inner diameter of the positioning
fitting portion 233 of the outer yoke 230 of the magnet unit 200. Further, the width dimension
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in the radial direction of the holding portion 440 is formed to be substantially the same as the
thickness dimension of the outer cylindrical portion 310 of the magnetic body 300. The vibrating
portion 410, the edge portion 430 and the rising portion 420 may be separately provided. The
vibrating portion 410 and the rising portion 420 may be integrally configured, or the edge
portion 430 and the rising portion 420 may be integrally configured.
In the diaphragm 400, when the magnetic body 300 is connected to the magnet portion 200, the
holding portion 440 is between the flange portion 232 of the outer yoke 230 of the magnet
portion 200 and one end portion of the outer cylinder portion 310. While being positioned and
held by the magnetic body 300. In this assembled diaphragm 400, the upstanding portion 420 is
axially movable without contacting between the inner yoke 220 of the magnet portion 200 and
the inner cylindrical portion 330 of the magnetic body 300, and the vibrating portion 410 is The
magnetic body 300 is disposed on the inner circumferential side of the inner cylindrical portion
330. For example, in the voice coil 500, a wire is wound directly around the outer peripheral
surface of the rising portion 420 of the diaphragm 400. In addition, it is good to fix with an
adhesive agent etc. Then, both ends of the wire are pulled out to the side opposite to the side
where the magnetic body 300 is connected, which is the lower side in FIG. Also, the voice coil
may be fixed to the inner circumferential surface of the rising portion 420. (Assembling
Operation of Speaker Device) Next, the assembling operation of the speaker device 100 will be
described with reference to the drawings. 4A and 4B are explanatory views showing the
assembling operation of the speaker device 100. FIG. 4A is an explanatory view showing a
positioning process of the magnet main body 210, the inner yoke 220 and the outer yoke 230,
and FIG. 4B is a positioning process of the diaphragm 400. FIG. 7C is an explanatory view
showing an assembling process of the magnetic body 300, and FIG. 7D is an explanatory view
showing a completed state of the speaker device 100. First, an assembly jig 600 formed in
advance is disposed at a predetermined assembly position. As shown in FIG. 4, this assembly jig
600 is formed of, for example, a synthetic resin, and has a mounting portion 610 on a
substantially circular plate. A substantially cylindrical gap positioning portion 620 having a
central axis passing through the center of the mounting portion 610 is integrally protruded on
one surface of the mounting portion 610. Further, in the gap positioning portion 620, a plurality
of notches 621 may be formed in a concave shape along the axial direction in a state of being
divided into a plurality. Then, as shown in FIG. 4A, the magnet portion 200 assembled and
formed integrally beforehand in the assembly jig 600 is mounted in a state in which the gap
positioning portion 620 of the assembly jig 600 is fitted on the inner periphery. It is placed on
the placement unit 610. Thereafter, an adhesive (not shown) is applied to the upper surface of
the flange portion 232 of the outer yoke 230 of the magnet unit 200 placed on the placement
unit 610. Further, as shown in FIG. 4B, a state in which the outer periphery of the voice coil 500
is fitted to the inner periphery of the gap positioning portion 620 of the rising portion 420 of the
diaphragm 400 on which the voice coil 500 is wound in advance. Insert it into
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At this time, since the gap positioning part 620 is provided with the plurality of cut parts 621,
the frictional force is relatively reduced and the parts are fitted relatively smoothly. Further, an
adhesive applied in advance is superimposed in a state in which the holding portion 440 which is
the peripheral portion of the diaphragm 400 is placed on the flange portion 232 while being
fitted to the positioning fitting portion 233 of the outer yoke 230 of the magnet portion 200.
Join at. Thereafter, as shown in FIG. 4C, while the end portion of the outer cylindrical portion
310 of the magnetic body 300 is fitted to the positioning fitting portion 233 of the outer yoke
230 of the magnet portion 200, the flange portion The holding portion 440 of the vibrating plate
400 is held by the flange portion 232 and the outer cylinder portion 310 until the holding
portion 440 of the vibrating plate 400 is in contact with the holding portion 440 of the vibrating
plate 400. In this state, the flange portion 232 and the outer cylinder portion 310 are joined by
an adhesive applied in advance. Then, as shown in FIG. 4D, the magnetic body 300 is assembled
from the side opposite to the side where the magnetic body 300 is joined so that the gap
positioning portion 620 can be pulled out from between the voice coil 500 of the magnet portion
200 and the diaphragm 400. The tool 600 is removed, and the speaker device 100 is assembled
and formed. (Operation and Effect of the Speaker Device) As described above, in the first
embodiment, the magnetic portion is held by positioning and holding the holding portion 440 of
the peripheral portion of the diaphragm 400 integrally provided with the voice coil 500. The
outer cylinder portion 310 of the magnetic body 300 is joined to one magnetic pole surface of
the magnetic body 200 via the outer yoke 230 constituting the magnet portion 200, and the
bridge portion 320 continues from the outer cylinder portion 310 of the magnetic body 300 to
the inner circumferential side. The inner cylindrical portion 330 of the magnetic body 300 which
covers the edge portion 430 of the diaphragm 400 and continues to the bridge portion 320 faces
the inner peripheral side of the voice coil 500, and the voice coil 500 is axially movable. A
magnetic gap G is formed in the radial direction of the portion 200 to form a magnetic circuit.
Therefore, the magnetic body 300 enters the dome shape on the inner peripheral side of the
voice coil 500 through the surface of the edge portion 430 from the outer peripheral side of the
diaphragm 400, and the magnet unit 200 is positioned on the outer peripheral side of the voice
coil 500. The configuration is obtained, and the amplitude of diaphragm 400 is relatively narrow
particularly in a portable type electric device, so that the distance between edge portion 430 and
magnetic body 300 is sufficiently small even if the distance between magnetic body 300 is
narrowed. Sound emission by vibration can be obtained, the dimension in the thickness direction
can be thinned, and thinning can be easily obtained. In addition, since the magnetic body 300 is
located in a dome shape on the surface side where the sound is generated, characterizing the
shape of the inner cylinder portion 330 facilitates acoustic characteristics such as horn effect
and tube resonance without using other members. Can be adjusted to improve the versatility.
Then, a standing portion 420 having a substantially cylindrical shape is provided in series from
the vibrating portion 410 as the vibrating plate 400, and an edge portion 430 of the peripheral
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portion is provided in series from the standing portion 420. Therefore, the voice coil 500 can be
directly wound on the outer peripheral surface of the rising portion 420 of the diaphragm 400,
and the productivity can be improved, and the diaphragm can be used without using a bobbin or
the like on which the voice coil 500 is wound. It can be provided integrally with 400, and the
configuration can be simplified, so that reduction in size and weight and cost can be easily
achieved. Furthermore, a state in which the magnetic body 300 wraps around the inner
periphery of the voice coil 500 can be easily obtained by the rising portion 420, and thinning can
be easily obtained without making the diaphragm 400 and the magnetic body 300 into
complicated shapes. It is possible to easily improve the manufacturability. The voice coil wound
in advance may be fixed to the inner peripheral surface of the rising portion 420 by a fixing
member such as an adhesive. Further, the outer peripheral edge of the edge portion of the
diaphragm 400 protrudes outward in a bowl shape and is positioned and held by the magnetic
body 300, that is, held by the outer yoke 230 of the magnet portion 200. The part 440 is
provided in series. Therefore, the diaphragm 400 can be easily positioned and held by the
magnetic body 300, that is, the diaphragm 400 can be easily positioned and held by being held
by the outer yoke 230 constituting the magnet unit 200, which is simple. Can easily improve the
manufacturability. Furthermore, since the peripheral portion of the diaphragm 400 is held by the
outer yoke 230 of the magnet unit 200 with the outer yoke 230 of the magnet unit 200 at one
end face of the outer cylinder 310 of the magnetic body 300, the increase in size in the radial
direction is suppressed. Positioning and holding can be performed, and miniaturization can be
easily achieved. The diaphragm 400 can be easily positioned and positioned by forming the
diametrical dimension of the diaphragm 400 to substantially the same dimension as the inner
diameter of the positioning fitting portion 233 of the outer yoke 230 of the magnet unit 200.
Positioning can be easily performed in which the voice coil 500 is disposed at a predetermined
position of the magnetic gap G without providing a special configuration such as a boss, and
manufacturability can be easily improved with a simple configuration. Further, the inner yoke
220 is fitted to the inner peripheral side of a ring-shaped magnet main body 210 having
different poles in the radial direction, that is, different magnetic pole surfaces on the outer
peripheral surface and the inner peripheral surface, and the outer yoke 230 on the outer
peripheral side. The magnetic circuit before fitting and attaching the magnetic body 300 is
integrally formed. Therefore, as a configuration for positioning and holding the peripheral
portion of the diaphragm 400, the magnetic body 300 and the outer yoke 230 can be easily held
by being held in a simple configuration, and the productivity can be improved. It is easily
obtained with a simple configuration that the magnetic gap G is formed to form a magnetic
circuit in a state where the magnetic coil wraps around and is positioned on the inner peripheral
side of the voice coil 500.
Further, as a configuration of the magnetic body 300 which covers the edge portion 430 of the
diaphragm 400 continuously to the one magnetic pole surface of the magnet unit 200 and turns
around to the inner peripheral side of the voice coil 500, the outer yoke 230 of the magnet unit
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200. The edge portion 430 of the diaphragm 400, and the end portion of the outer cylinder
portion 310 to be joined to the end portion of the inner cylinder portion 330 whose diameter is
smaller than the outer cylinder portion 310 and whose outer peripheral surface faces the inner
periphery of the voice coil 500. Are connected in series at the bridging portion 320 covering the
Therefore, with a simple configuration, for example, a steel plate can be easily formed by
pressing, and the productivity can be easily improved, and at the same time, a thin type can be
easily obtained. In addition, a positioning fitting portion 233 is provided on the outer yoke 230
of the magnet unit 200, and when connecting the magnetic body 300, the magnetic body 300 is
positioned and fitted so as to be concentric with each other. Therefore, the assembling operation
for obtaining the predetermined magnetic gap G can be facilitated, and the manufacturability can
be easily improved with a simple configuration. Further, the diaphragm 400 can also be
positioned by the positioning fitting portion 233, and the manufacturability can be easily
improved with a simpler configuration. Then, a through hole 321 is provided in the bridge
portion 320 of the magnetic body 300 facing the edge portion 430 of the diaphragm 400.
Therefore, since the air between the bridge portion 320 and the edge portion 430 communicates
with the outside through the through hole 321, the edge portion 430 of the diaphragm 400
vibrates in conjunction with the movement of the voice coil 500 at the time of sound generation.
In this case, the air between the bridge portion 320 and the edge portion 430 can be prevented
from being pressurized or decompressed to regulate the vibration of the edge portion 430, and
the vibration of the diaphragm 400 can be obtained. Output is obtained. Second Embodiment
Next, a second embodiment which is another embodiment of the speaker device of the present
invention will be described based on FIG. In the second embodiment shown in FIG. 5, the
magnetization direction of the magnet unit 200 in the first embodiment is changed. FIG. 5 is a
cross-sectional view showing the speaker device according to the second embodiment. In the
second embodiment, the same components as those of the first embodiment are denoted by the
same reference numerals and the description thereof will be omitted. The same applies to the
third embodiment described below. (Structure of Speaker Device) In FIG. 5, reference numeral
700 denotes a speaker device. This speaker device 700 includes a magnet unit 800, a magnetic
body 900, a diaphragm 400 and a voice coil similar to those of the first embodiment. It has 500
and.
The magnet unit 800 includes a magnet body 810, a connection yoke 820, and a magnetic pole
forming yoke 830. The magnet main body 810 is formed in a substantially ring shape of a
magnetic material, and different pole faces are formed on both end faces in the axial direction.
That is, the magnet body 810 is magnetized in such a manner that, for example, the end face in
the axial direction on the upper side in FIG. 5 is N pole and the end face in the axial direction on
the lower side in FIG. The connection yoke 820 is formed in a substantially ring shape, for
example, of a magnetic material such as a steel plate whose main component is iron. The inner
diameter and the outer diameter of the connection yoke 820 are substantially the same as those
of the magnet main body 810, and the connection yoke 820 is integrally joined to an end surface
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serving as an upper surface in the axial direction by an adhesive or the like. Further, the
connection yoke 820 is formed to be inclined such that the inner peripheral surface is expanded
toward one of the axial directions. The connection yoke 820 is integrally joined to the magnet
main body 810 by, for example, an adhesive in a state in which the inner circumferential surface
expands upward. In this joined state, the corner portion of the magnet body 810 and the corner
portion of the connecting yoke 820 are continuous, and the inner peripheral surface of the
magnet body 810 and the inner peripheral surface of the connecting yoke 820 are continuous at
an obtuse angle . When the area of the holding portion 440 in contact with the magnet body 810
is sufficiently secured, the connecting yoke 820 may be omitted and the holding portion 440
may be in direct contact with the magnet main body 810. Similar to the connection yoke 820, the
magnetic pole forming yoke 830 is formed in a substantially ring shape of a magnetic material.
The magnetic pole forming yoke 830 has a ring-shaped holding plate 831 whose inner diameter
is smaller than the inner diameter of the magnet body 810 and whose outer diameter is
substantially the same as the outer diameter of the magnet body 810. A substantially cylindrical
magnetic pole forming portion 832 having a central axis coaxial with the central axis of the
holding plate portion 831 is bent in series on the inner peripheral edge of the holding plate
portion 831. Further, the upper end surface which is one end in the axial direction of the
magnetic pole forming portion 832 is formed to be inclined outward. The magnetic pole forming
yoke 830 is integrally joined with an adhesive in a state in which the outer peripheral edge is
continuous with the outer peripheral edge of the magnet main body 810 and the magnet main
body 810 is held by the holding plate portion 831 and the connection yoke 820. In this joined
state, the magnetic pole forming portion 832 is separated from the inner circumferential surface
of the magnet main body 810, and the tip end surface is gradually separated from the magnet
main body 810 and the connecting yoke 820 by the inclined end face which is the tip end
surface. The opposing corners are in an obtuse angle state.
As shown in FIG. 5, in the magnetic body 900, the holding portion 910 in the form of a hook is
bent in a series toward the lower edge of the outer yoke 230 of the magnetic body 300 of the
first embodiment. It is formed in a curved shape. In addition, the holding and holding portion
910 is formed such that the outer diameter of the magnetic body 900 has substantially the same
size as the outer diameter of the magnet portion 200. Further, in the magnetic body 900, the
holding and holding portion 910 is integrally connected to the upper surface of the connection
yoke 820 of the magnet portion 200 by, for example, an adhesive. In addition, you may connect
not only by adhesion ¦ attachment by an adhesive agent but making it engage ¦ engage and
connect the claw part formed by cutting and joining, joining by welding, etc. With the magnetic
body 900 connected to the magnet portion 200, the outer peripheral surface of the inner
cylindrical portion 330 faces the inner peripheral surface of the magnetic pole forming portion
832 of the magnetic pole forming yoke 830 via the magnetic gap G having a predetermined gap
size. Do. As a result, the magnetic pole surface, that is, the N pole is formed on the outer
peripheral surface of the inner cylindrical portion 330, and the S pole is formed on the inner
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peripheral surface of the magnetic pole forming portion 832 to form a magnetic circuit. The
inner peripheral surface of connection yoke 820 of magnet unit 200 is inclined, and the tip end
surface of magnetic pole forming portion 832 of magnetic pole forming yoke 830 is inclined.
Therefore, the magnetic flux from the tip of magnetic pole forming portion 832 to connection
yoke 820 and magnet body 810 Leakage is suppressed. Further, the holding portion 440 of the
diaphragm 400 is wider than that of the first embodiment, and the diameter of the diaphragm
400 is substantially the same as the outer diameter of the magnet portion 200. That is, the width
dimension in the radial direction of the holding portion 440 is formed by subtracting the inner
diameter of the outer cylindrical portion 310 of the magnetic body 900 from the outer diameter
of the magnetic body. As a result, when bonding the magnetic body 900 to the magnet unit 200,
the outer peripheral surface of the edge portion 430 is positioned on the inner peripheral surface
of the outer cylindrical portion 310. (Assembling Operation of Speaker Device) Next, the
assembling operation of the speaker device 700 will be described. An assembly jig 600 similar to
that of the first embodiment described above is disposed at a predetermined assembly position.
Then, the magnet unit 800 assembled and formed integrally in advance with the assembly jig
600 is placed on the placement unit 610 in a state in which the gap positioning unit 620 of the
assembly jig 600 is fitted on the inner periphery. Thereafter, an adhesive (not shown) is applied
to the upper surface of the connection yoke 820 of the magnet unit 800. Thereafter, the
upstanding portion 420 of the diaphragm 400 on which the voice coil 500 is wound in advance
is fitted in a state in which the outer periphery of the voice coil 500 is fitted to the inner
periphery of the gap positioning portion 620.
Then, a holding portion 440 which is a peripheral edge of the diaphragm 400 is superimposed
on the connection yoke 820 of the magnet portion 800 and is bonded with an adhesive applied
in advance. Thereafter, the adhesive is further applied to the upper surface of the holding portion
440. Then, the holding portion 910 of the magnetic body 900 is held by the diaphragm 400
bonded to the magnet portion 800 so that the outer peripheral edge is flush with the outer
peripheral edge of the holding portion 440 and the outer peripheral edge of the magnet portion
800. It is made to overlap on the part 440, and it joins with the adhesive agent apply ¦ coated
previously. At the time of bonding of the magnetic body 900, the outer peripheral surface of the
edge portion 430 of the diaphragm 400 is positioned at the lower end edge of the outer
cylindrical portion 310 of the magnetic body 900. As a result, the voice coil 500 is disposed at a
predetermined position between the inner cylindrical portion 330 and the magnetic pole forming
portion 832 of the magnet portion 200. Thereafter, the assembly jig 600 is removed as in the
first embodiment, and the speaker device 700 is assembled. (Functions and Effects of the Speaker
Device) As described above, in the second embodiment, the magnetic body 900 is connected to
one magnetic pole surface of the magnet unit 800 as in the first embodiment. To the edge
portion 430 of the diaphragm 400 and wrap around the inner periphery of the voice coil 500.
Therefore, as in the first embodiment, the thickness can be easily reduced. Further, by
characterizing the shape of the inner cylindrical portion 330 of the magnetic body 900, the
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acoustic characteristics such as the horn effect and the tube resonance can be easily adjusted
without using other members, and the versatility can be improved. Further, the magnetic body
900 is provided with a holding and holding portion 910 which is held and fixed by the magnet
portion 800. For this reason, the magnetic body 900 can be reliably joined, and a good magnetic
circuit can be obtained, and the diaphragm 400 can be securely fixed. Then, the diametrical
dimension of the diaphragm 400 is formed to be substantially the same as the outer diameter of
the magnet portion 200, and the radial dimension of the holding portion 440 is the outer
diameter of the magnetic body to the outer cylinder portion of the magnetic body 900. It is
formed in a size obtained by subtracting the inner diameter of 310. Therefore, when the
magnetic body 900 is joined to the magnet unit 200, the outer peripheral surface of the edge
portion 430 is positioned on the inner peripheral surface of the outer cylindrical portion 310,
and the voice coil 500 is not provided. Can be easily arranged at a predetermined position.
Furthermore, since the outer diameter of the magnetic body 900 is made to be the same as the
outer diameter of the magnet portion 800, the centers of the magnetic body 900 and the magnet
portion 800 can be easily positioned on the same concentric shaft. While being able to improve
the properties, it is possible to assemble and form the appropriate magnetic gap G with a simple
operation of confirming the condition of the outer peripheral edge at the time of joining the
magnetic body 900.
Since the inner peripheral surface of the connection yoke 820 of the magnet unit 800 is inclined,
leakage of magnetic flux from the magnetic pole forming portion 832 to the connection yoke
820 can be prevented, and a good magnetic circuit can be obtained with a simple configuration .
Furthermore, since the tip end face of the magnetic pole forming portion 832 is also inclined,
leakage of magnetic flux can be further prevented, and a better magnetic circuit can be obtained.
Further, since the inner peripheral edge of connection yoke 820 is connected continuously to the
inner peripheral edge of magnet main body 810, the corner of magnet main body 810 is not
exposed, and the magnetic flux from the tip of magnetic pole forming portion 832 to the corner
of magnet main body 810 Can be prevented more effectively, and a better magnetic circuit can
be obtained. Third Embodiment Next, a third embodiment which is another embodiment of the
speaker device of the present invention will be described based on FIGS. 6 and 7. FIG. In the third
embodiment shown in FIG. 6, the ring-shaped magnet unit 200 in the first embodiment described
above is changed to a bar-like magnet. FIG. 6 is a plan view showing the speaker device
according to the third embodiment, and FIG. 7 is a cross-sectional view taken along the alternate
long and short dash line A-A in FIG. (Structure of Speaker Device) In FIG. 6, 100A is a speaker
device, and the speaker device 100A includes a magnet unit 200A, a magnetic body 300A, a
diaphragm 400A, and a voice coil 500A. The magnet unit 200A includes a magnet body 210A, an
inner yoke 220A, and an outer yoke 230A. The magnet main body 210A is formed of a magnetic
material in a rod shape having a longitudinal direction, and has different magnetic poles on an
inner side surface (a surface in a direction toward the center position of the speaker device
100A) and an outer side surface (a surface on the outer side of the speaker device 100A) A face
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is formed. That is, for example, the magnet main body 210A is magnetized in such a manner that
the inner side is an N pole and the outer side is an S pole, and a magnetic circuit is formed
between the magnet portion 200A and the magnetic body 300A. The inner yoke 220A is formed
of, for example, a magnetic material such as a steel plate containing iron as a main component
into a rod-like flat plate having a longitudinal direction. The inner yoke 220A has an axial
dimension slightly longer than that of the magnet body 210A, and one end face in the axial
direction is flush with one end face of the magnet body 210A. It is fixed by the adhesion means
of Similar to the inner yoke 220A, the outer yoke 230A is formed of a magnetic material. The
outer yoke 230A includes straight portions 233A facing each other and arc portions 234A
connecting the straight portions 233A.
The outer yoke 230A has an outer fixing portion 231A fixed to the magnet body 210A. At one
axial end of the outer fixing portion 231A, a flange portion 232A protruding outward like a hook
is bent and formed in series. The straight portion 233A of the outer yoke 230A is fixed to the
magnet main body 210A in a state where one end face in the axial direction opposite to the side
on which the flange portion 232A is provided is flush with one end face in the axial direction of
the magnet main body 210A. The magnet unit 200A is integrally assembled and formed. The
magnet portion 200 forms a magnetic pole surface or an N pole on the inner side surface of the
inner yoke 220A, and forms a magnetic pole surface or an S pole on an outer side surface of the
outer yoke 230A. In the speaker device 100A, a pair of such rod-like magnet portions 200A are
provided at positions facing each other. The magnetic body 300A is formed of a magnetic
material in a substantially rod shape. The magnetic body 300A has an outer frame portion 310A
formed on the axial direction upper portion of the outer yoke 230A. At the lower end in the axial
direction of the outer frame portion 310A, a pressing portion 311A that protrudes outward in a
bowl shape is bent and formed in series. At the other end of the outer frame portion 310A, a
bridge portion 320A bent inward in a substantially arc shape is formed in series. Further, an
inner frame portion 330A formed in a substantially rod-like flat plate at a predetermined size
inner side from the inner side surface of the inner yoke 220A of the magnet portion 200A at the
end opposite to the side where the outer frame portion 310A of the bridge portion 320A is
formed. Are bent in series. Further, a plurality of substantially circular through holes 321 are
formed in the bridge portion 320A. The magnetic body 300A is fixed by an adhesive while the
pressing portion 311A of the outer frame portion 310A abuts on the flange portion 232A of the
outer yoke 230A of the magnet portion 200A. In addition, you may connect not only by adhesion
¦ attachment by an adhesive agent but making it engage ¦ engage and connect the claw part
formed by cutting and joining, joining by welding, etc. In the magnetic body 300A, the outer
surface of the inner frame portion 330A is opposed to the inner side surface of the inner yoke
220A via the magnetic gap G having a predetermined gap size in a state of being connected to
the magnet portion 200A. A magnetic pole surface, that is, an S pole is formed on the outer
surface to constitute a magnetic circuit. The diaphragm 400A is formed substantially in the
shape of a thin film, for example, of a magnesium thin plate, a resin film or the like whose surface
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has been subjected to anti-corrosion treatment. The diaphragm 400A is formed in an oval shape
having a longitudinal direction in accordance with the rod-like shape of the magnet portion 200A
and the magnetic body 300A, and the magnet portion 200A and the magnetic body 300A are
respectively positioned at two positions along the longitudinal direction. Is arranged.
A curved vibrating portion 410A is provided substantially at the center of the vibrating plate
400A. A substantially cylindrical standing portion 420A is bent in a series on the periphery of
the vibrating portion 410A on the side opposite to the side where the vibrating portion 410 is
curved. The rising portion 420A is formed so as not to contact between the outer surface of the
inner frame portion 330A of the magnetic body and the inner surface of the inner yoke 220A of
the magnet portion 200A. Further, at one axial end of the upstanding portion 420A, an edge
portion 430A which is curved in the same direction as the vibrating portion 410A in the outer
direction is bent in a series of arcs. Further, on the outer periphery of the edge portion 430A, a
holding portion 440A protruding outward like a hook is bent and formed in series. The vibrating
portion 410A, the edge portion 430A, and the rising portion 420A may be separately configured.
Further, the vibrating portion 410A and the rising portion 420A may be integrally configured, or
the edge portion 430A and the rising portion 420A may be integrally configured. In the voice
coil 500 A, for example, a wire is wound directly on the outer surface of the rising portion 420 of
the diaphragm 400. In addition, it is good to fix with an adhesive agent etc. Then, both ends of
the wire are drawn to the side opposite to the side where the magnetic body 300 is connected,
and become an input end of an audio signal. Further, in the arc portion 234A where the magnet
main body 210A of the outer yoke 230A is not disposed, the diaphragm 400A is formed in an arc
shape in the planar direction. The voice coil 500A has a linear portion at the location where the
magnet main body 210A and the magnetic body 300A are disposed, and is disposed along the
bar-like magnet main body 210A, and the diaphragm 400A at a location corresponding to the arc
portion 234A of the outer yoke 230A. It is formed in an arc shape in accordance with the shape
of the rising portion 420A. The holding portion 440A of the diaphragm 400A is held between the
flange portion 232A of the outer yoke 230A and the pressing portion 311A of the outer frame
portion 310A at the linear portion 233A where the magnet body 210A and the magnetic body
300A are disposed. In the above, it is fixed to the outer yoke 230A by means such as adhesion.
Further, a holder may be used which covers the outer yoke 230A in the arc portion and holds the
diaphragm 400A. (Operation and Effect of the Speaker Device) Similar to the operation and effect
of the first embodiment described above, the magnetic body 300A is joined to one magnetic pole
surface of the magnet unit 200A through the outer yoke 230A, and the diaphragm 400A is Of
the voice coil 500 so as to cover the edge portion 430 A of the voice coil 500.
Thereby, similarly to the first embodiment, the thickness can be easily reduced, and by
characterizing the shape of the inner frame portion 330A, for example, the acoustic
characteristics such as the horn effect and the tube resonance can be easily adjusted without
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using other members. it can. Further, in the third embodiment, since the rod-like magnet portion
200A is used, processing is easier and cost for processing is lower than that of a ring-shaped
magnet. Thus, according to the third embodiment, the time and cost required for production can
be reduced. Further, since the voice coil 500A is wound around the upstanding portion 420A of
the diaphragm 400A in a shape having a linear portion, the linear portion of the voice coil 500A
and the linear portion of the bar-like magnet portion 200A correspond to each other. It can be
arranged. As a result, the voice coil 500A can be maintained at a constant distance from the pole
face of the magnet unit 200A without bending, so that a good magnetic circuit can be
maintained. Further, since the pair of rod-like magnet units 200A are arranged to face each
other, the magnetic circuit formed by these magnet units 200A has a symmetrical shape, and is
laterally symmetrical by the electric signal flowing through the voice coil 500A. Since similar
vibration can be obtained, good vibration of the diaphragm 400A can be obtained, and a good
reproduction output of the audio signal can be obtained. In addition, the diaphragm 400A is
formed in an oval shape having a longitudinal direction and a direction orthogonal to the
longitudinal direction according to the shape of the voice coil 500A and the shape of the magnet
portion 200A. The assembly can be easily performed, for example, the dimensions of can be
easily matched. Fourth Embodiment Next, a fourth embodiment which is another embodiment of
the speaker device of the present invention will be described based on FIGS. 8 to 10. FIG. FIG. 8 is
a plan view showing the speaker apparatus according to the fourth embodiment, FIG. 9 is a crosssectional view taken along the alternate long and short dash line B-B in FIG. It is. (Structure of
Speaker Device) In the speaker device of the third embodiment, the voice coil is formed in a
substantially rectangular planar shape in the fourth embodiment. In FIG. 8, in the speaker device
100B, the voice coil 500B is formed in a rectangular shape, and rod-like magnet portions 200A
and 200B are disposed at positions corresponding to the four sides of the rectangular shape.
That is, a pair of rod-shaped magnet portions 200A opposed in the longitudinal direction of the
rectangle is disposed, and a pair of rod-shaped magnet portions 200B opposed in the direction
orthogonal to the longitudinal direction are disposed.
The magnet units 200B are disposed at both ends of the magnet unit 200A, and are designed to
be smaller than the length dimension of the magnet unit 200A. The magnet unit 200A is the
same as that of the third embodiment described above, and thus the description thereof is
omitted. Hereinafter, the magnet unit 200B is disposed and a direction orthogonal to the
longitudinal direction will be described. The magnet unit 200B includes a magnet body 210B, an
inner yoke 220B, and an outer yoke 230B. The magnet main body 210B is formed of a magnetic
material in a rod shape, and a magnetic pole surface which is the same as the magnet main body
210A is formed on the inner side surface and the outer side surface. That is, if the magnet main
body 210B has, for example, an N pole on the inner side surface of the magnet main body 210A
and an S pole on the outer side, the magnet main body 210B becomes an N pole on the inner side
and an S pole at the outer side. It is magnetized by The inner yoke 220 B is a member formed in
the same manner as the inner yoke 220 A described in the third embodiment, but the length
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dimension of the magnet main body 210 B to be fixed is greater than the length dimension of the
magnet main body 210 A Because of the small size, the longitudinal dimension of the inner yoke
220B is also set smaller than the longitudinal dimension of the inner yoke 220A. The outer yoke
230B includes straight portions 233A facing each other and a circular arc portion 234B
connecting the straight portions 233A. The outer yoke 230B has an outer fixing portion 231A
fixed to the magnet main body 210A and an outer fixing portion 231B fixed to the magnet main
body 210B. At one axial end of the outer fixing portions 231A and 232B, flange portions 232A
and 232B protruding outward in a hook shape are bent and formed in series. At this time, the
flange portion 232B in the arc portion 234A is formed larger than the flange portion in the linear
portion 233A so that the holding portion 440A of the diaphragm 400B can be adhered and fixed
to the flange portions 232A and 232B. There is. An outer frame portion 310B of the magnetic
body 300B is provided on the axial direction upper portion of the outer fixing portion 231B of
the outer yoke 230B. At the lower end in the axial direction of the outer frame portion 310B, a
pressing portion 311B protruding outward like a hook is bent and formed in series. The pressing
portion 311B has a shape that largely protrudes outward, and is formed to be joined to the
flange portion 232B of the outer yoke 230B. At the other end of the outer frame portion 310B, a
bridge portion 320B bent inward in a substantially arc shape is formed in series, and further, an
inner frame portion 330B is bent in series formed inside the bridge portion 320B. .
In the state where the magnetic body 300B is connected to the outer yoke 230B of the magnet
portion 200B, the outer peripheral surface of the inner frame portion 330B faces the inner
peripheral surface of the inner yoke 220B via the magnetic gap G having a predetermined gap
size. A magnetic pole surface, that is, an S pole is formed on the outer peripheral surface of the
inner frame portion 330B to constitute a magnetic circuit. The diaphragm 400 B is formed
substantially in the form of a thin film of, for example, a magnesium thin plate, a cone paper, or
the like whose surface has been subjected to a corrosion resistance treatment. The diaphragm
400B is formed in an oval shape having a longitudinal direction in accordance with the rod-like
shape of the magnet unit 200A and the magnetic body 300A. A curved vibrating portion 410B is
provided substantially at the center of the diaphragm 400B. The vibrating portion 410B is
formed in a substantially rectangular shape, and a substantially cylindrical standing portion
420B is bent in a series on the periphery of the vibrating portion 410B on the side opposite to
the side where the vibrating portion 410B is curved. The rising portion 420B is formed so as not
to contact between the outer surface of the inner frame portion 330A, 330B of the magnetic
body and the inner surface of the inner yoke 220A, 220B of the magnet portion 200A, 200B.
Further, at one axial end of the rising portion 420B, an edge portion 430B which is curved in the
same direction as the vibrating portion 410B in the outward direction is bent in a series of arcs.
Further, on the outer periphery of the edge portion 430B, a holding portion 440B protruding
outward like a hook is bent and formed in series. The vibrating portion 410B, the edge portion
430B and the rising portion 420B may be separately provided. Further, the vibrating portion
410B and the rising portion 420B may be integrally configured, or the edge portion 430B and
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the rising portion 420B may be integrally configured. (Operation and Effect of Speaker Device)
Similar to the operation and effect of the first embodiment described above, the magnetic bodies
300A and 300B are joined to one of the pole faces of the magnet units 200A and 200B via the
outer yoke 230B The edge portion 430B of the diaphragm 400B is covered so as to wrap around
inside the voice coil 500B. Thus, as in the first embodiment, the thickness can be easily reduced,
and by characterizing the shapes of the inner frame portions 330A and 330B, for example,
acoustic characteristics such as horn effect and tube resonance are also prepared without using
other members. Can be adjusted. Further, the voice coil 500 B is formed in a rectangular shape,
and a pair of rod-like magnet parts 200 A facing each other is provided in the longitudinal
direction of the rectangle, and the pair of rod-like magnets facing each other in the direction
orthogonal to the longitudinal direction. The portions 200B are provided on both ends of the
magnet portion 200A.
As a result, it is easier to make than a ring-shaped magnet, and since a magnetic circuit can be
formed around the entire circumference of the voice coil 500B by a rod-shaped magnet, good
voice reproduction output can be obtained. be able to. [Modification of the Embodiment] The
present invention is not limited to the above-described embodiments, and includes the following
modifications as long as the object of the present invention can be achieved. That is, the
configuration of the magnet units 200 and 800 is not limited to the above-described
configuration, and can be changed as appropriate. For example, as described above, the
connection yoke 820 may not be provided. Further, the magnetic bodies 300 and 900 can be
connected to one of the magnetic pole faces of the magnet units 200 and 800, and can be
changed to any shape that can be wound around the inner periphery of the voice coil 500. For
example, in the second embodiment, when sufficient joining can be performed at the end of the
outer cylindrical portion 310 of the magnetic body 900, the clamp holding portion 910 may not
be provided, or the flange portion 232 may not be provided. . Furthermore, also in the first
embodiment, the positioning fitting portion 233 may not be provided as long as the positioning
can be easily performed by an assembly jig or the like. For example, as shown in FIG. 11, the
outer yoke 230 of the magnet unit 200 according to the first embodiment is not provided with
the positioning fitting portion, and a diaphragm using the magnetic body 900 according to the
second embodiment. It is also possible to hold and hold 400. For example, as shown in FIG. 11,
the magnetic body 300 may be provided with a configuration capable of obtaining acoustic
characteristics such as a bass reflex effect, a horn effect, and tube resonance. That is, taking FIG.
11 as an example, reference numeral 950 denotes a cover portion, and the cover portion 950 has
a plate portion 951 formed in a substantially disc shape, for example, of a steel plate or the like.
At the periphery of the plate portion 951 is provided a joint portion 952 which is bent to be
inclined to one side and joined to the magnetic body 900. In addition, a plurality of circular holes
953A are formed in the plate portion 951. Then, a substantially cylindrical duct 953 that is led
out to the side where the joint portion 952 is bent is provided in series on the inner peripheral
edge of the circular hole 953A. The cover portion 950 is integrally attached to the magnetic body
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900 by welding the distal end portion of the joint portion 952 to the bridge portion 320 of the
magnetic body 900 by welding or the like in a state where the duct 953 protrudes toward the
diaphragm 400. . The through hole 321 provided in the magnetic body 900 is preferably
provided in a state facing the space defined by the cover portion 950 and the diaphragm 400.
According to such a configuration, the edge portion 430 and the magnetic body 900 are
provided. Can be used as a volume to resonate with the duct 953, so that a bass reflex effect can
be produced and more appropriate acoustic characteristics can be obtained.
Further, the cover portion 950A in FIG. 6 has a plate portion 951A formed in a substantially
rectangular shape. The peripheral edge of the plate portion 951A is joined to the magnetic body
300A, and connects the magnetic bodies 300A facing each other. In particular, as in the third
embodiment, the speaker device 100A in which the pair of rod-like magnet units 200A are
disposed opposite to each other is weak against pressure in the direction orthogonal to the
longitudinal direction of the speaker device. By connecting between 300 A, the speaker device
100 A can be reinforced and the diaphragm 400 A can be protected. Further, the hole 954
provided in the cover 950A is a hole for transmitting the vibration of the sound generated from
the speaker device 100A to the outside. As described above, since the magnetic body 300, 900
covers the edge portion 430 and wraps around the inner periphery of the voice coil 500, the
cover portion 950 on the substantially circular plate can be easily attached. While being able to
improve manufacturability, the diaphragm 400 can be protected with a simple configuration.
Furthermore, with the simple configuration in which the substantially cylindrical horn portion
953 is provided in the cover portion 950, it is possible to easily impart acoustic characteristics.
In the case where the cover portion 950 is used only as a cover of the diaphragm 400, it is
preferable that the plate portion 951 has a punching metal or mesh configuration, for example,
to ensure sound propagation. Furthermore, the configuration for bonding the magnetic body
300, 900 and the magnet unit 200, 800 may be any method. For example, as shown in FIG. 12, if
sufficient positioning coercivity can be obtained, the width dimension of the holding portion 440
of the diaphragm 400 is narrowed to connect the holding portion 910 of the magnetic body 300
and the magnet portion 800. A part of the yoke 820 may be directly joined. In this case, it is
preferable to provide a step by the thickness of the holding portion 440 in the holding portion
910, for example, to facilitate positioning and to improve the adhesion between the holding
portion 910 and the connection yoke 820. According to the configuration shown in FIG. 12, since
the magnetic body 300 and the magnet unit 800 are directly bonded, it is possible to prevent the
leakage of the magnetic flux and obtain a good magnetic circuit. In addition, the level ¦ step
difference for the thickness of the holding part 440 may be provided in the connection yoke 820,
and may be provided in both. In addition, although the peripheral portion of the diaphragm 400
is clamped and positioned and held at the time of joining the magnetic body 300, 900 and the
magnet portion 200, 800, the configuration has been described where positioning is held by this
clamping and fixing For example, a configuration for positioning and holding the diaphragm 400
may be provided on the magnetic members 300 and 900, and the diaphragm 400 may be
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positioned and held directly on the magnetic members 300 and 900, for example.
As described above, the speaker devices 100 and 700 are not limited to those used in portable
electric devices. Further, when the speaker devices 100 and 700 are assembled and formed, the
assembly jig 600 may not be used. The assembly jig 600 is not limited to the above
configuration. For example, in the case of using the magnetic body 900, a jig having a
configuration in which a member for positioning the outer peripheral surface of the magnet
portion 200, 800 in a continuous state of the outer periphery of the magnetic body 900 may be
used. Furthermore, a configuration may be employed in which there is no cut portion 621 or a
configuration in which the positioning portion 620 is formed in a substantially cylindrical shape
and a plurality of protrusions are provided on the circumference. Then, a dustproof member such
as a net, woven fabric, non-woven fabric or the like is provided on the rear side of the speaker
device 100, 700 on the side opposite to the side to which the magnetic body 300, 900 is
attached. May be Although the voice coil 500 is wound around the outer peripheral surface of
the rising portion 420 of the diaphragm 400, for example, the voice coil 500 may be wound
around the inner peripheral surface of the rising portion 420. Further, in the third and fourth
embodiments, the shape in the plane direction of the diaphragms 400 A and 400 B is an oval
shape, but it is a substantially polygonal shape such as a rectangular shape, an elliptical shape, a
triangular shape or a hexagonal shape. Or the like, as long as it is formed in a closed shape.
Similarly, for the voice coils 500A and 500B, for example, the shape in the plane direction may
be a rectangular shape, an elliptical shape, or a substantially polygonal shape such as a triangular
shape or a hexagonal shape, that is, formed in a closed shape. Good. When the voice coil is
formed in a flat elliptical shape, an elliptical magnet may be used, or a combination of an arcshaped magnet and a bar-shaped magnet may be used. When the voice coil is formed in a planar
substantially polygonal shape, rod-like magnets can be installed at positions corresponding to the
respective sides. In the first and second embodiments, ring magnets are used, and in the third
and fourth embodiments, rod magnets are used. However, these ring magnets and rod magnets
are used. The speaker device may be formed by combining magnets, and the shape of these
magnets is not particularly limited. For example, it is a speaker device capable of forming a
magnetic circuit over the front peripheral portion by using a rod-like magnet in a straight part
and a semicircular magnet in an arc part in an oblong speaker device having a longitudinal
direction. It is also good. Further, in the first, third and fourth embodiments and FIGS. 3, 7 and 9
of these, the magnet portions 200, 200A, 200B are provided with the inner yokes 220, 220A,
220B and the magnet main body 210. 210A, 210B and the outer yokes 230, 230A, 230B are
formed such that one end faces in the axial direction are flush with each other, but the present
invention is not limited thereto.
That is, for example, as shown in FIG. 13, the magnet body 210 of the magnet portion 200 may
be disposed slightly lower along the axial direction. In addition, the specific structure and
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procedure in practicing the present invention can be appropriately changed to another structure
or the like as long as the object of the present invention can be achieved. [Operation and Effect of
the Embodiment] As described above, the peripheral portion of the diaphragm 400 integrally
provided with the voice coil 500 is positioned and held, and the magnetic body 300 is
continuously formed on one magnetic pole surface of the magnet unit 200. To cover the edge
portion 430 of the diaphragm 400 and face the inner peripheral side of the voice coil 500 with
the magnetic body 300 facing, and the magnetic gap in which the voice coil 500 intervenes in
the radial direction of the magnet portion 200 movably in the axial direction. Form G to form a
magnetic circuit. Therefore, the magnetic body 300 enters the dome shape on the inner
peripheral side of the voice coil 500 through the surface of the edge portion 430 from the outer
peripheral side of the diaphragm 400, and the magnet unit 200 is positioned on the outer
peripheral side of the voice coil 500. The configuration is obtained, and the amplitude of
diaphragm 400 is relatively narrow particularly in a portable type electric device, so that the
distance between edge portion 430 and magnetic body 300 is sufficiently small even if the
distance between magnetic body 300 is narrowed. Sound generation by vibration can be
obtained, the dimension in the thickness direction can be reduced, and the thickness can be
easily reduced. In addition, since the magnetic body 300 is located in a dome shape on the side
of the surface on which sound is generated, for example, acoustic characteristics such as horn
effect and tube resonance can be easily adjusted by the magnetic body 300 without using other
members. Can also be improved. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view
showing a speaker apparatus according to a first embodiment of the present invention. FIG. 2 is a
side view showing the speaker device according to the first embodiment. FIG. 3 is a crosssectional view showing the speaker device according to the first embodiment. FIG. 4 is an
explanatory view showing an assembling operation of the speaker device according to the first
embodiment. (A): an explanatory view showing a magnet positioning step (B): an explanatory
view showing a diaphragm positioning step (C): an explanatory view showing a magnetic body
assembling step (D): an explanation showing a completed state of the speaker device FIG. 5 is a
cross-sectional view showing a speaker device according to a second embodiment of the present
invention. FIG. 6 is a plan view showing a speaker device according to a third embodiment of the
present invention. FIG. 7 is a cross-sectional view showing a speaker device according to a third
embodiment of the present invention. FIG. 8 is a plan view showing a speaker device according to
a fourth embodiment of the present invention.
FIG. 9 is a cross-sectional view showing a speaker apparatus according to a fourth embodiment
of the present invention. FIG. 10 is another cross-sectional view showing a speaker device
according to a fourth embodiment of the present invention. FIG. 11 is a cross-sectional view
showing a speaker device according to still another embodiment of the present invention. FIG. 12
is a cross-sectional view showing a speaker device according to still another embodiment of the
present invention. FIG. 13 is a cross-sectional view showing a speaker device according to still
another embodiment of the present invention. [Description of the code] 100, 700, 100A, 100B
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Speaker device 200, 800, 200A, 200B Magnet part 210, 810, 210A, 210B Magnet body 220,
220A, 220B Inner yoke 230, 230A Outer yoke 233 Positioning as a positioning part Fitting part
300, 900, 300A, 300B Magnetic body 310, 310A, 310B Outer cylinder part 320, 320A, 330B
Bridged part 321 Through hole 330, 330A, 330B Inner cylinder part 400, 400A, 400B
Diaphragm 410, 410A, 410B Vibrating part 420, 420A, 420B Upstanding part 430, 430A, 430B
Edge part 440, 440A, 440B Holding part 500, 500A, 500B Voice coil 600 Assembly jig 610
Mounting part 620 Gap positioning part 21 cut portion 820 connecting yoke 830 magnetic pole
forming yoke 950,950A, 950B cover 953 horn section G magnetic gap
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