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JPH08251692

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPH08251692
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker in which a diaphragm, a coil and a magnetic circuit are accommodated in a frame, and
more particularly to a speaker in which the magnetic circuit is securely fixed in the frame.
[0002]
2. Description of the Related Art FIG. 3 (a) is a cross-sectional view showing a conventional onvehicle dynamic speaker, and FIG. 3 (b) is an enlarged cross-sectional view of a magnetic circuit A
shown in FIG. 3 (a). In the speaker shown in FIG. 3A, a cone-shaped paper diaphragm 2 is
provided in the frame 1. The conical bottom 2a of the diaphragm 2 is connected to the opening
edge 1a of the frame 1 via a deformation joint 4 whose cross section is curved in a semicylindrical shape. The outer periphery of the conical head 2 b of the diaphragm 2 is supported on
the inner surface of the frame 1 via the damper 5. The damper 5 is formed of a flexible sheet
obtained by knitting resin fibers, a paper material, a resin film, or the like, and a multistage
waveform is formed concentrically. The diaphragm 2 is supported by the deformation joint 4 and
the damper 5 in a vibratable state.
[0003]
Further, a cylindrical bobbin 6 is connected to the conical head 2b of the diaphragm 2, and a pair
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of coils (voice coils) C1 and C2 are wound around the outer periphery of the bobbin 6. The
bobbin 6 is formed of a paper material or a paper material impregnated with a resin.
[0004]
A ring-shaped member constituting the magnetic circuit A is provided on the base end side in the
frame 1. In FIG. 3B, the ring-shaped member provided inside the bobbin 6 is a yoke 7, which is
made of a magnetic material of high magnetic permeability. The ring-shaped member provided
on the outer side of the bobbin 6 has a magnet 8 magnetized so as to have magnetic anisotropy
in the axial direction, and a magnetic body 8a of high permeability connected to both axial end
faces of the magnet 8 , 8b.
[0005]
A pair of gaps G1 and G2 are formed in the opposing part of the yoke 7 and the magnetic
members 8a and 8b, and the coils C1 and C2 are located in the respective gaps. The longitudinal
magnetic field in the Y-axis direction emitted from the magnet 8 is converted by the magnetic
members 8a and 8b into a transverse magnetic field toward the gaps G1 and G2, and a magnetic
flux crossing the coils C1 and C2 located in the gaps G1 and G2 is given. . When a voice current
is applied to the coils C1 and C2, an electromagnetic force (driving force) in the Y-axis direction
acts on the coils C1 and C2 by the current and the magnetic flux, and the coils C1 and C2 and the
bobbin 6 At the same time, vibration is given to the diaphragm.
[0006]
In the magnetic circuit A of the conventional type speaker shown in FIGS. 3 (a) and 3 (b), the step
1c on the inner peripheral side and the step on the outer peripheral side on the base end side of
the frame 1 1d is formed, and the yoke 7 constituting the magnetic circuit A, the magnet 8 and
the magnetic body 8b are positioned between the steps and fixed with an adhesive.
[0007]
However, in the structure in which the members constituting the magnetic circuit A are fixed
only by the adhesive, the mounting strength is low.
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That is, the coils C1 and C2 generate heat due to Joule heat by the AC voice current flowing
through the coils C1 and C2, and this heat is transferred to the yoke 7, the magnet 8 and the
magnetic members 8a and 8b. Due to this heat, the adhesion of the yoke 7 to the frame 1 or the
adhesive bonding the magnet 8 and the magnetic body 8 b to the frame 1 is reduced, and the
yoke 7 or the magnet 8 to the magnetic body 8 b There is a drawback that it is easy to get out of
it. In particular, when the frame 1 is formed of resin such as ABS in order to reduce the weight of
the entire speaker, the heat generated at the portions of the coils C1 and C2 and the magnetic
circuit A can not be dissipated to the outside, and the heat is accumulated. The influence of heat
on the surface of the magnetic circuit A increases, and the mounting strength of the members
constituting the magnetic circuit A tends to be reduced.
[0008]
Also, in order to increase the attachment strength of the members constituting the magnetic
circuit A, as shown in FIG. 4, the attachment member 9 is provided on the top of the yoke 7, and
the screw 10a is inserted into the attachment member 9 from the diaphragm 2 side. A structure
is conceivable in which the tip of the screw 10 a is screwed into the screw hole 10 b of the tip 1
e of the convex portion formed on the bottom of the frame 1.
[0009]
However, in the mounting structure shown in FIG. 4, when the screw head of the screw 10 a is
tightened and rotated by a driver or the like, iron powder scraped from the male screw portion of
the screw 10 a or the head of the screw 10 a passes above the yoke 7 And there is a risk that
they will fall within the gaps G1, G2.
The iron powder adheres to the yoke 7 and the magnetic members 8a and 8b by magnetic
attraction in the gaps G1 and G2. Since the gaps G1 and G2 are formed so as to have a very
narrow opposing distance, if iron powder is adsorbed in the gaps G1 and G2, they will interfere
with the vibration due to the electromagnetic force of the coils C1 and C2, and There is also a
risk of damaging the insulation coating of the coils C1 and C2.
[0010]
The present invention solves the above-mentioned conventional problems, and can firmly fix
members constituting a magnetic circuit and can prevent iron powder from entering the gap
portion of the magnetic circuit by making screw tightening unnecessary. And it aims at providing
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a speaker by making the installation work easy.
[0011]
According to the present invention, in a frame, a diaphragm, a coil for giving vibration to the
diaphragm, and a magnetic circuit for giving a magnetic field to the coil are provided, and the
coil constitutes a magnetic circuit. In the speaker positioned in the opposing gap of the member,
a mounting member made of nonmagnetic material is inserted between the center hole of the
member constituting the magnetic circuit and the frame, and the end of the mounting member is
the outer surface of the frame or It is characterized in that it is crimped to the end face of the
member constituting the magnetic circuit.
[0012]
In the above, the mounting member may support a small speaker installed on the diaphragm
side.
The small speaker is, for example, a tweeter, and can be a so-called two-way type speaker.
[0013]
The mounting member is formed of a nonmagnetic material such as aluminum or aluminum
alloy, brass, zinc alloy, copper, copper alloy, etc. For example, one formed in a tubular shape is
the center of the member constituting the magnetic circuit. It is inserted into the hole and the
frame, and the end of the mounting member is pressure-deformed, and the frame and the
member are crimped and fixed by the mounting member.
[0014]
In the present invention, the mounting member made of nonmagnetic material is inserted into
the center hole of the yoke or magnet, which is a member constituting the magnetic circuit, and
the hole formed in the frame, and the end of the mounting member is crimped and deformed. As
a result, the members constituting the magnetic circuit and the frame are crimped and fixed.
In this caulking operation, no metal powder is generated by the screw tightening operation, so
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that the metal powder does not enter the gap of the magnetic circuit and the coil is not damaged.
Furthermore, since the members constituting the magnetic circuit are firmly fixed by caulking,
the adhesive is thermally deteriorated such as when the members constituting the magnetic
circuit are fixed only by the adhesive, which may cause rattling or peeling off. There are no
problems with this.
[0015]
The mounting member is made of a nonmagnetic material, and may be made of resin or the like.
However, the mounting member is formed of a nonmagnetic metal having a good thermal
conductivity such as aluminum or aluminum alloy, so that it is generated from the coil portion.
The heat accumulated in the portion of the magnetic circuit can be dissipated to the outside of
the frame by the mounting member. In addition, when the mounting member is formed in a pipe
shape, the flow of air can be formed in the hollow portion, and the heat dissipation effect can be
further enhanced.
[0016]
If the mounting member is extended in the direction of the diaphragm (Y direction) and formed
into a cylindrical shape, a small speaker such as a tweeter can be installed thereon. That is, the
mounting member can be used both as a fixing mechanism of a member constituting a magnetic
circuit and as a support member of a small speaker such as a tweeter.
[0017]
Furthermore, when the mounting member is formed of a nonmagnetic material, no eddy current
loss or hysteresis loss occurs as in the case of using an iron-based metal, and an adverse effect on
the magnetic circuit can be prevented.
[0018]
In addition, fixing work by caulking is easy and automatic.
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[0019]
DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described
below with reference to the drawings.
FIG. 1 (a) is a longitudinal sectional view showing a dynamic type speaker used as an on-vehicle
or the like as the first embodiment of the present invention, and shows the time of fitting of the
mounting member, and FIG. 1 (b) is a mounting FIG. 2 is a cross-sectional view of a speaker
showing a second embodiment after the completion of caulking of members.
[0020]
In each of the embodiments shown in FIGS. 1 and 2, in these speakers, the frame 11 is formed by
injection molding of a plastic material such as ABS.
Therefore, the entire speaker is lightweight. In addition, the frame 11 may be die-casted from a
lightweight alloy such as an aluminum alloy or a zinc alloy other than plastic.
[0021]
The diaphragm 12 has a conical shape (cone shape) formed of paper or the like, and a spherical
dome portion 13 is joined to the conical head 12b. The edge of the conical bottom 12 a of the
diaphragm 12 is joined via the deformation joint 14 to the opening edge 11 a of the frame 11.
The deformed joint portion 14 is provided in a circumferential shape separately from the
diaphragm 12 along the edge of the conical bottom portion 12b, and its cross-sectional shape is
a semicircular shape (semi-cylindrical shape) having a predetermined radius of curvature It is.
[0022]
The outer periphery of the conical head 12b of the diaphragm 12 is supported by the frame 11
via a damper 15 having a corrugated deformation portion formed concentrically in multiples. The
diaphragm 12 is vibratably supported by the deformation joint 14 and the damper 15. The
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bobbin 16 is connected to the conical head 12 b of the diaphragm 12. The bobbin 16 is
cylindrically wound by a sheet-like material such as a paper material or a resin material. A pair of
coils (voice coils) C1 and C2 are wound around the outer peripheral surface of the bobbin 16.
[0023]
Inside the base portion 11b of the frame 11, a ring-shaped member (pole piece) constituting the
magnetic circuit A1 is accommodated. The ring-shaped member provided inside the bobbin 16 is
a yoke 17, and is formed of a magnetic material of high permeability such as soft ferrite. The
ring-shaped member provided outside the bobbin 16 is a magnet 18. The magnet 18 is a bonded
magnet (plastic magnet) in which magnetic powder (magnet powder) is hardened by resin. Two
gaps G1 and G2 are formed at opposing portions of the yoke 17 and the magnet 18, and the coils
C1 and C2 are located in the respective gaps. In the magnet 18 in this embodiment, the portion
facing the coil C1 is N pole, and the portion facing the coil C2 is magnetized S pole.
[0024]
A central hole 11e is formed at the center of the frame base 11b. Further, on the frame base 11b,
a step 11d on the outer peripheral side concentric with the center hole 11e is formed. A ringshaped space B is formed on the more proximal side than this. The space portion B is formed to
secure a moving region of the end portion 16a of the bobbin 16 which passes through the gap of
the magnetic circuit A1 and extends to the base end side and the lower coil C2. is there.
[0025]
Hereinafter, a method of fixing the yoke 17 which is an inner ring-shaped member constituting
the magnetic circuit A1 will be described. In the first embodiment shown in FIG. 1 (a), a mounting
member 19 of nonmagnetic material is used. The mounting member 19 is formed of
nonmagnetic metal such as aluminum, aluminum alloy, zinc alloy, copper alloy or the like, and
the flange portion 19a and the pipe-shaped shaft portion 19b are integrally formed. Notches 19c
extending in the axial direction are formed at a plurality of locations at constant intervals in the
circumferential direction at the tip of the shaft 19b.
[0026]
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The outer peripheral diameter of the shaft portion 19b of the mounting member 19 is
substantially the same as the inner diameter of the central hole 11e of the frame 11 and the
central hole 17a of the yoke 17. The shaft portion 19b has almost no gap between the central
hole 11e and the central hole 17a. It is inserted without having.
[0027]
In the process before the diaphragm 12, the damper 15 and the like are attached in the frame
11, the yoke 17 is installed on the inner surface of the base 11 b of the frame 11.
The shaft portion 19 b of the mounting member 19 is inserted into the central hole 17 a of the
yoke 17 from the upper side in the drawing, and causes the portion where the cut 19 c is formed
to project from the central hole 11 e toward the bottom surface of the frame 11. For example,
when caulking tools such as reference numerals 21 and 22 are inserted from the upper and
lower sides of the mounting member 19 and pressed by a press machine or the like, the part
where the notch 19c of the tip of the shaft 19b is formed undergoes expansion deformation. As
shown in FIG. 1 (b), it is crimped to the outer surface of the base 11b of the frame 11. The yoke
17 and the frame 11 are sandwiched between the flange portion 19a of the mounting member
19 and the deformed portion by caulking, and the yoke 17 is positioned and fixed based on the
outer peripheral surface of the mounting member 19 fitted in the center hole 11e. Be done.
[0028]
The magnet 18, which is a ring-shaped member on the outer peripheral side, is fitted so as to be
positioned on the step 11d of the frame base 11b, and is fixed by an adhesive. The mounting
member 19 fixes the yoke 17 constituting the magnetic circuit A1 by caulking, and the screw
tightening operation is unnecessary. Therefore, the iron powder does not scatter in the frame 11
in the assembling operation, and the metal powder enters and adheres in the gap G1 or G2, so
that the coils C1 and C2 can not be moved or stuck or the coils C1 and C2 The coating of the
winding is not damaged by metal powder. In addition, since the assembly work by caulking can
be performed in a short time by a press machine or the like, the assembly work is easy.
[0029]
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Furthermore, if the mounting member 19 is formed of a nonmagnetic metal with good thermal
conductivity, when Joule heat in the coils C1 and C2 is accumulated in the portion of the
magnetic circuit A1, this heat passes through the mounting member 19 and the frame 11 It
becomes easy to diverge to the outside of the Therefore, even when the frame 11 is formed of a
synthetic resin and the heat of the portion of the magnetic circuit A1 is not easily dissipated to
the outside from the frame 11, a sufficient heat dissipation effect can be obtained using the
mounting member 19. In addition, when the mounting member 19 has a pipe shape, the heat of
the magnetic circuit A1 is easily dissipated by convection through the hollow portion. Further,
the pipe-like mounting member 19 is easy to be deformed at the time of caulking, and the
caulking operation is easy. Further, by forming the mounting member 19 of a nonmagnetic
material, it is possible to prevent the occurrence of eddy current loss and the like due to the
provision of the mounting member 19.
[0030]
The mounting member 29 in the second embodiment shown in FIG. 2 is formed of nonmagnetic
metal as in the first embodiment. The mounting member 29 has a flange portion 29a and a pipelike shaft portion 29b, and the same notch as that of the first embodiment shown in FIG. 1 is
formed at the tip of the shaft portion 29b. The shaft portion 29 b is inserted into the center hole
11 e of the frame 11 and the center hole 17 a of the yoke 17 without a gap.
[0031]
The mounting member 29 is formed with a cylindrical portion 29d extended forward from the
edge of the flange portion 29a, and a small speaker 23 such as a tweeter is fixed to the
cylindrical portion 29d. The mounting member 29 in the second embodiment is for fixing the
yoke 17 which is an inner ring-shaped member constituting the magnetic circuit A1, but the
mounting member 29 is a support for supporting the small speaker 23 such as a tweeter. It also
has a function as a member.
[0032]
Also in the embodiment shown in FIG. 2, the magnet 18 is positioned on the step 11 d and fixed
to the frame 11 by an adhesive. In this speaker, the mounting member 29 is inserted into the
center hole 17a of the yoke 17 and then inserted into the center hole 11e of the frame 11 before
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the diaphragm 12 and the damper 15 are attached, and the tool 21 shown in FIG. , 22 and so on.
Thereafter, the diaphragm 12 and the damper 15 are attached, and the small speaker 23 is
attached to the attachment member 29.
[0033]
Also in this embodiment, when the mounting member 29 is crimped, the iron powder does not
scatter and adhere to the gaps G1 and G2. Further, the heat from the coils C1 and C2 can be
effectively dissipated by the mounting member 29. In the second embodiment, both the members
constituting the magnetic circuit and the small speaker can be easily attached by using a caulking
operation.
[0034]
In the first and second embodiments described above, the ring-shaped members constituting the
magnetic circuit may be magnets located on the inner side of the bobbin 16 and yokes located on
the outer side of the bobbin 16. In this case, the magnet 18 is fixed by caulking by the mounting
member 19 or 29.
[0035]
Further, in the mounting member 19, the flange portion 19 a may be installed on the outer
surface side of the frame 11, and the mounting member may be press-deformed and crimped on
the upper end side of the yoke 17 in the drawing. Moreover, the diaphragm 12 may not be a
cone shape, and may be a speaker that emits a sound by the vibration of air in the horn.
[0036]
According to the present invention, the members constituting the magnetic circuit can be firmly
fixed by the mounting member, the generation of metal powder can be suppressed, and the metal
powder does not scatter inside the frame. Thus, the metal powder is prevented from adhering to
the gap portion of the magnetic circuit.
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[0037]
Further, the parts can be made common by using a structure in which the metal powder of the
mounting member does not scatter in the frame and by using the mounting member as a support
member for a small speaker such as a tweeter.
[0038]
Brief description of the drawings
[0039]
FIG. 1 (a) shows a speaker according to a first embodiment of the present invention, and is a
cross-sectional view showing attachment of the attachment member, and FIG. 1 (b) is a crosssectional view showing the attachment member after crimping.
[0040]
2 is a cross-sectional view showing the speaker of the second embodiment,
[0041]
3 (a) is a cross-sectional view showing a conventional speaker, FIG. 3 (b) is an enlarged crosssectional view of a magnetic circuit,
[0042]
Figure 4 is a cross-sectional view showing another conventional speaker structure,
[0043]
Explanation of sign
[0044]
11 Frame 11b Frame Base 11d Step 11e of Frame 11 Center Hole 12 Diaphragm 13 Dome 15
Damper 16 Bobbin 17 Yoke 17a Center Hole 18 Magnet 19, 29 Mounting Member 19a, 29a
Flange 19b, 29b Shaft 19c, 29c Notch 29d Cylindrical 21, 22 crimping tool 23 small speaker A1
magnetic circuit C1, C2 coil G1, G2 gap
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