JP2010041128

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DESCRIPTION JP2010041128
An object of the present invention is to lower the lowest resonance frequency f and obtain good
acoustic characteristics while miniaturizing a speaker, and in particular to eliminate the adverse
effect of a locally formed small space. A vibrating body (4), a magnetic circuit (3), and a frame (2)
supporting the vibrating body (4) and the magnetic circuit (3). The vibrating body (4) is a voice
on which a vibrating plate and a voice coil are wound. The coil support portion 44 and the edges
42 and 43 that vibratably support the voice coil support portion 44 on the frame 2 are provided,
and both of the edges 42 and 43 are disposed on the magnetic circuit 3. A space K1 is formed
between and surrounded by the frame 2 and the voice coil support 44, and the air holes 44a and
44b of the voice coil support 44 are inside the space K1 and the voice coil support 44
respectively. The internal space K0 is in communication. [Selected figure] Figure 1
Speaker apparatus and automobile
[0001]
In particular, the present invention relates to a speaker device mounted in a limited space such as
a door of a car and a car equipped with the speaker device.
[0002]
In the conventional speaker device, a space is provided between the inner peripheral surface of
the speaker case and the outer peripheral surface of the magnetic circuit portion, and the space
is communicated with the internal space provided between the diaphragm and the magnetic
circuit. A large chamber is formed in the case (see, for example, Patent Document 1).
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Hereinafter, this technique is referred to as a first conventional example.
[0003]
In the conventional speaker device, in the space formed by the voice coil support, the edge, the
magnetic circuit and the frame, the space is provided between the diaphragm and the magnetic
circuit by providing the air hole in the voice coil support. It is in communication with the internal
space (see, for example, Patent Document 2). Hereinafter, this technique is referred to as a
second conventional example.
[0004]
[Patent Document 1] Japanese Patent Application Publication No. 2007-181120 (claim 1, [0040],
[0043], [0045], FIG. 4) WO 2008/004272 (claim [8], [0037], FIG. 1)
[0005]
In a general dome-shaped speaker, a voice coil wound around a voice coil connected to a domeshaped diaphragm is arranged so as to be able to vibrate in a magnetic gap of a magnetic circuit,
and the diaphragm is a speaker via an edge portion It is fixed to the frame.
In the speaker with the above configuration, when an electric signal is supplied to the voice coil
from the outside, a driving force due to the magnetic action is generated in the voice coil, and the
diaphragm vibrates to emit a sound wave. In such a dome-shaped speaker, a space called a
chamber may be provided on the back of the speaker to lower the lowest resonance frequency
f0. However, when the chamber is provided on the back of the speaker, the thickness of the
speaker itself becomes large, so it has been difficult to reduce the minimum resonance frequency
f0 and obtain good acoustic characteristics while achieving downsizing of the speaker.
[0006]
In the first prior art example described above, it is possible to lower the lowest resonance
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frequency f0 while achieving miniaturization by forming the chamber, and in the second prior art
example by the voice coil support portion, the edge, the magnetic circuit and the frame The
compression of air in the formed space is reduced, making it possible to obtain good acoustic
properties. However, when the diaphragm vibrates with a large amplitude in the vicinity of the
lowest resonance frequency f0 in both prior art examples, a small space formed locally (for
example, in the first prior art example is formed below the edge, the second prior art example In
this case, the air in the space formed on the outer periphery of the magnet repeats the process of
compression and expansion, and in particular, when the air is compressed, the downward
vibration of the diaphragm may be suppressed to cause distortion in the acoustic characteristics.
[0007]
The present invention has been made in view of the above-described circumstances, and an
example of the problem is to solve the problems as described above, and a speaker device
capable of solving these problems and the speaker device The purpose is to provide a car
equipped with
[0008]
In order to solve the above-mentioned subject, a speaker device concerning the invention
according to claim 1 is provided with a vibrator, a magnetic circuit, a frame which supports the
vibrator and the magnetic circuit, and the vibrator is a vibrator. A plate, a voice coil support on
which a voice coil is wound, and a plurality of edges supporting the voice coil support vibratably
on the frame, each of the plurality of edges being formed by the magnetic circuit The first space
is disposed on the upper side and is surrounded by the frame and the voice coil support portion
between the plurality of edges, and the voice coil support portion has a vent hole on the side
surface, and the vent hole The present invention is characterized in that the first space
communicates with an internal space inside the voice coil support.
[0009]
FIG. 1 is a cross-sectional view showing a configuration of a speaker device 1 according to an
embodiment of the present invention, FIG. 2 is a partial enlarged view of FIG. 1, and FIG. 3 is a
schematic view showing air flow of the speaker device shown in FIG. FIG. 4 is a perspective view
showing the configuration of a voice coil support according to an embodiment of the present
invention.
The speaker device 1 includes a frame 2, a magnetic circuit 3, and a vibrating body 4.
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The frame 2 has a function as a base of the speaker device 1.
[0010]
The frame 2 is made of, for example, an iron-based metal, a non-ferrous metal or an alloy thereof,
a synthetic resin or the like. Examples of iron-based metals include pure iron, oxygen-free steel
and silicon steel. Examples of non-ferrous metals include aluminum, magnesium or zinc.
Examples of the synthetic resin include olefin resins such as polypropylene, and thermoplastic
resins such as ABS (acrylonitrile / butadiene / styrene) and polyethylene terephthalate. The
frame 2 is formed by, for example, squeezing an iron-based metal, die-casting a non-ferrous
metal or an alloy thereof, or injection-molding a synthetic resin.
[0011]
As a whole, the frame 2 having a substantially concave shape includes, in order from the upper
end, a cover supporting portion 2a for supporting the cover 6, a support mounting portion 2b for
mounting the annular support 5 for supporting the vibrating body 4, and a magnetic A side face
2c surrounding the entire circuit 3 and a bottom 2d on which the magnetic circuit 3 is mounted
are provided, and a center pole 2e extending in the acoustic radiation direction is provided at the
center of the bottom 2d. In the bottom portion 2d, a convex portion 2f is annularly formed in the
vicinity of the outer periphery of the bottom surface, and the magnetic circuit 3 is mounted on
the convex portion 2f. Therefore, the bottom portion 2d and the magnetic circuit 3 are formed
inside the convex portion 2f. There is a gap s (see FIG. 3) therebetween. The center pole 2e is
formed in a substantially cylindrical shape provided with a projection of a convex portion at the
top and penetrates the center of the magnetic circuit 3. The cover 6 is provided with a plurality
of sound emission holes for emitting sound waves emitted from the diaphragm 41 or the edge
42. Further, the cover 6 is attached to the frame 2 so as to cover the diaphragm 41 and the edge
42.
[0012]
The vibrating body 4 has a diaphragm 41, edges 42 and 43, a voice coil support portion 44, and
a voice coil 45. The diaphragm 41 has a reverse dome shape, and the outer peripheral edge
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portion is fixed to the outer peripheral surface near the upper end of the voice coil support
portion 44 with an adhesive or the like, and is concave inside the voice coil support portion 44.
The outer peripheral end of the diaphragm 41 has a falling portion falling along the voice coil
support portion 44 and an outer peripheral side portion extending from the falling portion
toward the edge 42. The diaphragm 41 is bonded, in particular, by an adhesive or the like
between the falling portion and the outer peripheral side surface of the voice coil support portion
44. The diaphragm 41 is not limited to the inverted dome shape, and may have another shape
such as a dome shape or a flat shape.
[0013]
The material of the diaphragm 41 is, for example, paper, a woven fabric using fibers, a knitted
fabric using fibers, a non-woven fabric, a woven fabric using fibers, impregnated with a binding
resin made of silicone resin or the like, a metal material, There are synthetic resins, acrylic foams,
hybrid materials composed of synthetic resins and metals, and the like. Examples of the metal
material include aluminum, titanium, duralumin, beryllium, magnesium, and alloys thereof.
Examples of the synthetic resin include polypropylene, polyethylene, polystyrene, polyethylene
terephthalate, polyethylene naphthalate, polyarylate, polymethyl methacrylate, polycarbonate,
epoxy resin and the like. In addition, the acrylic foam uses, for example, methyl methacrylate,
methacrylic acid, styrene, maleic anhydride, and methacrylamide as raw materials.
[0014]
As a material of the voice coil support portion 44, for example, a metal material or a synthetic
resin can be adopted. Specifically, for example, a material having no air permeability, such as a
metal such as aluminum or duralmin, or a resin film such as polyimide can be adopted as the
material of the voice coil support portion 23.
[0015]
In the voice coil support portion 44 formed in a cylindrical shape, the diaphragm 41 is fixed to
the inner circumferential surface near the upper end, and the voice coil 45 is wound around the
outer circumferential surface near the lower end (that is, the magnetic circuit 3 side). There is.
Both ends of the voice coil 45 are electrically connected to the other ends of a pair of tinsel wires
(not shown). The voice coil support portion 44 is fixed to the inner peripheral portion of the edge
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42 and the inner peripheral portion of the edge 43 by an adhesive or the like in the vicinity of
the upper end and in the vicinity of the center, respectively. The edges 42 and 43 are fixed to the
support mounting portion 2 b of the frame 2 by the support 5, whereby the voice coil support 44
is supported by the frame 2. The voice coil support portion 44 is elastically held by the edges 42
and 43 so that the voice coil 45 is disposed in a magnetic gap g (see FIG. 3) described later. The
edges 42 and 43 also play a role of elastically supporting the diaphragm 41, the voice coil
support portion 44 and the voice coil 45 along the vibration direction (vertical direction) in the
driving state of the speaker device 1 .
[0016]
As shown in FIG. 2, the edges 42 and 43 respectively have rising portions 42 a and 43 a adhered
to the voice coil support portion 44 at an angle upward, and flat extending horizontally from the
outer peripheral edge of the rising portions 42 a and 43 a And 42b, 43b, curved portions 42c,
43c curved in a convex shape from the outer peripheral edge of the flat portions 42b, 43b, and
flat portions 42d, 43d extending horizontally from the outer peripheral edge of the curved
portions 42c, 43c, The cross section is substantially S-shaped in the lateral direction. The flat
portion 42d is sandwiched by the upper end of the support 5 and the lower end of the cover 6,
and the flat portion 43d is sandwiched by the lower end of the support 5 and the upper end of
the support mounting portion 2b. Here, since the inner peripheral side surface of the support
base 5 is formed to be inclined outward as it goes downward, most of the bottom surface of the
flat portion 42d is in close contact with the support base, but the upper surface of the flat
portion 43d is on the curved portion 43c side Some of the are exposed. The flat portions 42 d
and 43 d of the edges 42 and 43 are located below the flat portions 42 b and 43 b. Therefore,
the flat portions 42d and 43d are disposed below the flat portions 42b and 43b, so that the
occurrence of lateral vibration or the like of the diaphragm 41 can be suppressed. It becomes
possible to support vibratably. Since the edges 42 and 43 move following the vibration of the
diaphragm 41, it is necessary to provide a predetermined space above and below the edge 42.
The cover 6 has a curved cross-sectional shape in the vicinity of the edge 42 and the inner
surface of the cover 6 forms a predetermined space between the edge 42 and the cover 6. The
support 5 has a shape in which the inner peripheral side surface is inclined outward as it goes
downward, so that a predetermined space is formed between the edge 43 and the support 5.
Therefore, the edges 42 and 43 can move following the vibration of the diaphragm 41.
[0017]
The tops T of the curved portions 42c and 43c are disposed outside the center line C which
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bisects the horizontal distance between one end and the other end of the curved portions 42c
and 43c. By arranging in this manner, the top T where the curvature is large and a relatively
large force acts is provided at a position further away from the voice coil support portion 44, so
that the edge is obtained even if the diaphragm 41 is vibrated with a large amplitude. 42 and 43
can follow the vibration of the diaphragm 41. Further, the amplitude of the diaphragm 41 can be
made relatively large, and a large volume of reproduced sound can be provided.
[0018]
Since the edge 42 and the edge 43 have substantially the same shape and substantially the same
material, the rigidity is substantially the same, so both exhibit substantially the same behavior. As
a result, since the voice coil support portion 44 is supported by two equal forces of the same
magnitude, the lateral movement of the voice coil support portion 44 can be effectively
suppressed, whereby the voice coil 45 can be used as the plate 31 in the magnetic gap g. It is
possible to suppress the generation of abnormal noise and the like accompanying the contact
with an object. Further, since the mounting positions of the edges 42 and 43 are above the
magnetic gap g, the mounting to the voice coil support portion 44 is not difficult, and the
production can be facilitated.
[0019]
In addition, the materials of the edges 42 and 43 are selected from known materials used for the
edges, which have relatively low or hardly air permeability to the material constituting the
damper made of rubber, resin sheet, polyester fiber, aramid fiber etc. Ru. As a result, as shown in
FIG. 1, an annular space K1 is formed by the edges 42 and 43, the voice coil support portion 44,
and the support base 5. In addition, a substantially annular space K2 is formed by the edge 43,
the voice coil support portion 44, the case side surface 2c, and the yoke side portion 33d
described later.
[0020]
The voice coil support portion 44 is supported by the frame 2 via the edges 42 and 43 above the
position where the voice coil 45 is wound. Further, the total length of the voice coil support
portion 44 (the vibration direction of the diaphragm 41) is smaller than the total length of the
speaker 1 (the vibration direction of the diaphragm 41). In addition, the voice coil support
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portion 44 has the entire height such that the lower end portion of the voice coil support portion
44 is disposed in the vicinity of the lower surface of the plate 31 of the magnetic circuit 3
described later or the upper surface of the magnet 32. The voice coil support portion 44 is
supported on the frame 2 by the edges 42 and 43 above the voice coil 45, and prevents the voice
coil support portion 44 from rolling by vibration propagating through the voice coil support
portion 44. can do. The characteristic vibration generated in the voice coil supporting portion as
shown in the second prior art is a factor, that is, the position of the voice coil becomes an
antinode in the characteristic vibration to generate rolling and contact with the magnetic circuit
etc. It can be deterred. The voice coil support portion 44 forms an internal space K0, the upper
portion of which is sandwiched by the diaphragm 41 and the lower portion of which is
sandwiched by the plate 31 and the center pole 2e. Also, the voice coil support portion 44 has a
first vent 44 a formed at a predetermined height between the edge 42 and the edge 43. Further,
the voice coil support portion 44 has a second vent 44b formed at a predetermined height below
the edge 43 and above the upper end of the yoke side portion 33d. By forming the first air vent
44a and the second air vent 44b, as shown in FIG. 3, the space K1 is formed of the voice coil 44
through the air passage 50a formed by the first air vent 44a. It communicates with the internal
space K0. In addition, the space K2 is in communication with the internal space K0 of the voice
coil 44 via the air passage 50b constituted by the second air hole 44b.
[0021]
The positions of the vent holes 44a and the vent holes 44b in the circumferential direction are
substantially the same, that is, 44a is bored immediately above the vent holes 44b. A plurality of
vent holes 44a and 44b may be provided respectively, in which case the height 44a may be
provided directly above the vent holes 44b having substantially the same height and which are
bored at substantially equal intervals in the circumferential direction. desirable. For example, as
shown in FIG. 4A, when four vent holes 44a and 44b are respectively provided, the vent holes
44b 1, 44b 2, 44b 3 and 44b 4 have substantially the same height and are 90 degrees in the
circumferential direction. It is desirable that the holes 44a1, 44a2, 44a3 and 44a4 have a
substantially identical height and be drilled immediately above the holes 44b1, 44b2, 44b3 and
44b4, respectively. Further, three vent holes 44a and 44b may be bored, and they may be bored
at intervals of about 120 degrees in the circumferential direction.
[0022]
When eight air vents 44a and four air vents 44b are formed as shown in FIG. 4 (b), the air vents
44b1 are two stages vertically and the air vents 44b are one stage. , 44b2, 44b3 and 44b4 are
drilled at the same height at 90 degree intervals in the circumferential direction, and the vent
holes 44a1, 44a2, 44a3 and 44a4 have heights h directly above the vent holes 44b1, 44b2,
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44b3 and 44b4, respectively. It is desirable that the air holes 44a4, 44a6, 44a7, 44a8 be formed
at the same height h just above the air holes 44a1, 44a2, 44a3, 44a4.
[0023]
As described above, by providing the first air holes 44 a, the air in the space K 1 is suppressed
from being compressed, the air flows efficiently, and the vibration of the diaphragm 41 is not
suppressed, so that the acoustic characteristics can be obtained. It is possible to suppress the
occurrence of distortion or the like.
Further, by providing the second vent hole 44b, the air compressed in the space K2 can be
released, and the air can be made to flow. Thereby, suppression of the vibration of the diaphragm
41 by compression of the air of the space K2 can be suppressed. Further, by providing the vent
holes 44a and 44b, the air heated by the Joule heat of the voice coil 45 flows, and members
around the voice coil 45, for example, the plate 31, the magnet 32, and the edges 42 and 43
(especially rising It can suppress that the temperature of part 42a, 43a) rises. In particular,
occurrence of high temperature demagnetization in the magnet 32, and deterioration and peeling
of the rising portions 42a and 43a can be suppressed. Furthermore, a large chamber (air
chamber) below the diaphragm 41 can be secured, and the minimum resonance frequency f0 can
be reduced.
[0024]
In addition, it is desirable that both the first vent holes 44a and the second vent holes 44b be
formed in a circle having substantially the same size. In addition, it is desirable that the vent
holes be formed at substantially equal intervals in the circumferential direction as well as in the
height direction. By configuring the air holes 44a and 44b in this manner, distortion is less likely
to occur in the voice coil 45, as compared with the case where the drilling position in the
circumferential direction is shifted or when the heights are uneven. It becomes possible to
transmit the vibration to the diaphragm 41 evenly.
[0025]
The inner peripheral side surface of the support 5 is formed to be inclined outward as it goes
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downward. As described above, by inclining the inner peripheral side surface of the support 5
with respect to the vertical direction, the air in the space K1 can be more easily flowed, and the
diaphragm 41 can be efficiently vibrated. In particular, since the support base 5 is inclined
toward the outside of the edge as it goes downward, air can flow to the diaphragm 41 without
suppressing the vibration of the diaphragm 41. .
[0026]
The magnetic circuit 3 is configured by stacking the plate 31, the magnet 32, and the yoke 33 so
that the central axes coincide with each other. The plate 31 is formed of, for example, a magnetic
material such as iron, and is formed in a disk shape in which a through hole 31a having a larger
diameter than the center pole 2e is provided at the center, and upper and lower edges of inner
and outer peripheral surfaces are It is chamfered. The magnet 32 is made of, for example, a
permanent magnet such as a rare earth type, samarium cobalt type, alnico type, or ferrite type
magnet, and is formed in a disc shape provided with a through hole 32a having a larger diameter
than the through hole 31a. The diameter is smaller than that of the plate 31. The yoke 33 is
made of, for example, a magnetic material such as pure iron, non-oxygen steel, silicon steel, etc.,
and has a disk-like projection 33b provided with a through hole 33a larger in diameter than the
through hole 32a at the center It comprises a yoke bottom 33c for supporting the outer
periphery of the annular portion 33b and a yoke side 33d which rises from the outer periphery
of the yoke bottom 33c to the height of the plate 31 and is the side of the magnetic circuit 3. The
outer diameter of the yoke protrusion 33b is substantially the same as or smaller than that of the
magnet 32, the outer diameter of the yoke bottom 33c is substantially the same as or larger than
that of the plate 31, and the inner diameter of the yoke side portion 33d is that of the plate 31,
the magnet 32, and the protrusion. It is larger than the stem 33b.
[0027]
Here, the inner peripheral surface of the upper end of the yoke side portion 33d is provided with
a convex portion 33e inside, and the convex portion 33e is chamfered. The inner diameter of the
convex portion 33 e is slightly larger than the outer diameter of the plate 31. With such a
configuration, as shown in FIG. 3, a magnetic gap g, which is a slight gap, is formed between the
outer peripheral surface of the plate 31 and the inner peripheral surface of the upper end
portion of the yoke side portion 33d. As described above, since the voice coil 45 is disposed in
the magnetic gap g, the magnetic gap g is divided by the voice coil 45 into the inner portion and
the outer portion. The yoke side portion 33d has a recess in which a part of the inner peripheral
side opposite to the outer peripheral side of the yoke bottom 33c is recessed inward, and the
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recess is fitted to the yoke bottom 33c. Further, in the vicinity of the recess of the yoke side
portion 33d, a plurality of through holes 33f are formed in an annular or circumferential shape
described later.
[0028]
Further, since the magnetic circuit 3 having the above configuration is mounted on the convex
portion 2 f in the frame 2, a ventilating gap s is generated between the bottom portion 2 d and
the magnetic circuit 3 inside the convex portion 2 f.
[0029]
As described above, since the outer peripheral surface of the yoke projection 33b is supported by
the yoke bottom 33c, an annular space K3 is formed by the inner surface of the frame 2, the
bottom surface of the yoke projection 33b, and the inner peripheral surface of the yoke bottom.
Be done.
Further, since the inside diameter of the yoke side portion 33d is larger than that of the plate 31,
the magnet 32, and the projection-like portion 33b, the outer peripheral surface of the magnet
32, the inner peripheral surface of the yoke side portion 33d, the outer peripheral surface of the
projection-like portion 33b and the yoke bottom portion An annular space K4 is formed on the
upper surface of 33c.
[0030]
A center pole 2e penetrates through the through holes 31a, 32a and 33a, and annular air
passages 36a, 36b and 36c are formed between the center pole 2e and the plate 31, the magnet
32, and the yoke 33, respectively. The air passage 36b is wider than the air passage 36a, the air
passage 36c is wider than the air passage 36b, and the air passage 36 is constituted by the air
passages 36a, 36b and 36c. Then, as shown in FIG. 3, the space K3 communicates with the
internal space K0 of the voice coil support portion by the air passage 36. Further, since the
through hole 33f is provided in the yoke bottom portion 33c at a part near the boundary with
the yoke side portion 33d, the space K3 is separated from the space K4 through the air passage
37 constituted by the gap s and the through hole 33f. It communicates. The space K4
communicates with the internal space K0 of the voice coil support portion by the air passage 38a
which is an inner portion of the voice coil 45 in the magnetic gap g, and the space K4 is a space
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by an air passage 38b which is an outer portion of the voice coil 45 in the magnetic gap g. It
communicates with K2. In addition, since the upper and lower edge portions of the outer
periphery of the plate 31 and the convex portion 33e are chamfered, the air can easily flow in
the air passages 38a and 38b. In addition, since the upper and lower edges of the inner
periphery of the plate 31 are also chamfered, air can easily flow in the air passage 36.
[0031]
By connecting the space K3 to the internal space K0 as in the above configuration, the chamber
can be largely secured, and the minimum resonance frequency f0 can be reduced. Also, since the
space K4 is similarly in communication with the internal space K0, a large chamber can be
secured, and the minimum resonance frequency f0 can be reduced. In addition, since the space
K4 is also in communication with the space K2, the air flow occurs, so that the suppression of the
vibration of the diaphragm 41 due to the compression of the air in the space K2 can be
suppressed. Furthermore, the communication between the space K3 and the space K4 serves as a
larger chamber and can reduce the lowest resonance frequency f0. And since the circulation path
of air is realized by communicating the space K3, the space K4, and the internal space K0, it is
more effectively suppressed that the compressed air suppresses the downward vibration of the
diaphragm 41. be able to.
[0032]
According to the speaker device 1 of the above-described embodiment, the air in each space is
compressed and expanded by connecting all the spaces (the spaces K1 to K4 in the above
example) with the internal space K0. When repeated, the downward vibration of the diaphragm is
not suppressed and distortion is not generated in the acoustic characteristics, and the minimum
resonance frequency f0 can be lowered and favorable acoustic characteristics can be obtained
while achieving downsizing of the speaker. .
[0033]
FIG. 5 is a cross-sectional view showing a configuration of a door 51 of a car attached with the
speaker device 1 according to the embodiment of the present invention.
In FIG. 5, the bracket 52 is disposed on the back surface of the door 51, the unit member 53 is
attached to the surface of the door 51, and the speaker device 1 is attached via the unit member
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53.
[0034]
Although the embodiments of the present invention have been described in detail with reference
to the drawings, the specific configuration is not limited to the embodiments, and changes in
design etc. within the scope of the present invention are not limited. Even if it exists, it is
contained in this invention. For example, in the above-mentioned embodiment, although the
shape of diaphragm 41 showed the example which is an inverted dome shape, it is not limited to
this and it may be a positive dome shape which is convex on the upper side. However, if the
inverted dome shape is used, the overall size of the speaker device can be further reduced.
[0035]
Moreover, in the above-mentioned embodiment, although the edge and the edge 43 showed the
example which is substantially the same in a shape and material substantially, it is not limited to
this, for example, even if it is another shape or another material, rigidity is It can be adopted
unless the behavior is extremely different due to a significant difference or the like. When the
shape and the material are substantially the same, the types of parts do not increase and the
production is simple. Further, in the above-described embodiment, an example is shown in which
both the edge 42 and the edge 43 have a curved portion that is convex upward, but the present
invention is not limited to this. For example, the curved portion of the edge 42 is convex upward
The curved portion of the edge 43 may be convex downward or vice versa. Moreover, in the
above-mentioned embodiment, although the diaphragm 41 and the voice coil support part 44
were made into another body, it is good also as integral molding. Further, a plurality of through
holes 33f may be provided in the yoke 33.
[0036]
BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows the structure of the
speaker apparatus based on one embodiment of this invention. It is the elements on larger scale
of FIG. It is a schematic diagram which shows the flow of the air of the speaker apparatus shown
in FIG. (A) Perspective view of voice coil support according to another embodiment of the present
invention, (b) Perspective view of voice coil support according to another embodiment of the
present invention. BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows
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the structure of the door of the motor vehicle which attached the speaker apparatus which
concerns on one embodiment of this invention.
Explanation of sign
[0037]
DESCRIPTION OF SYMBOLS 1 ... Speaker apparatus, 2 ... Frame, 2a ... Cover support part, 2b ...
Support stand attachment part, 2c ... Side, 2d ... Bottom part, 2e ... Center pole, 2f ... Convex part,
3 ... Magnetic circuit, 4 ... Vibrator, Reference Signs List 5 support base 6 cover 31 plate 31a
through hole 32 magnet 32a through hole 33yoke 33a through hole 33b protruding portion 33c
yoke bottom 33e convex 33f: through hole 36, 37, 38a, 38b: air passage, 41: diaphragm, 42, 43:
edge, 42a, 43a: rising portion, 42b, 43b: flat portion, 42c, 43c: curved portion 42d, 43d Flat
portion 44 Voice coil support portion 44a First vent 44b Second vent 45 Voice coil 50a 50b Vent
51 door 52 52 bracket , 53 ... unit Member, C ... centerline, g ... magnetic gap, K0 ... internal
space, K1, K2, K3, K4 ... space, s ... gap, T ... top
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