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JPH09187096

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Notice
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
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPH09187096
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the
technical field of a speaker device for converting an electrical signal into sound.
[0002]
2. Description of the Related Art Heretofore, as shown in FIGS. 8 to 12, a so-called internalmagnet or external-magnet type magnetic circuit and a magnetic circuit of this magnetic circuit
are disposed so as to be movable and movable. The voice coil 108 and the cone paper 101,
which is a diaphragm attached to the voice coil, to convert the electric signal supplied to the
voice coil 108 into the sound generated by the vibration of the cone paper 101. A speaker device
for converting has been proposed.
[0003]
Such a speaker device is referred to as a conductive speaker.
In this conductive type speaker device, the voice coil 108 moves in the magnetic flux in the
magnetic gap 119 along with the cone paper 101 by supplying an electric signal, and the cone
paper 101 is vibrated. Let
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[0004]
As shown in FIGS. 8 and 9, the inner magnet type magnetic circuit includes a wedge type yoke
111, a disk-like magnet 110 disposed on the bottom surface of the wedge type yoke 111, and a
magnet 110 disposed on the magnet 110. And the pole piece 113. An annular top plate 109 is
attached to the tip of the wedge-shaped yoke 111. The top plate 109 and the pole piece 113
form an annular magnetic gap 119.
[0005]
The center portion of the frame 106 is attached to the tip end side of the wedge-shaped yoke
111. The frame 106 supports the outer peripheral edge portion of the corn paper 101 through
the flexible edge 103 at the outer peripheral edge.
[0006]
As shown in FIGS. 10 to 12, the external magnet type magnetic circuit is disposed on the disk
110, an annular magnet 110 disposed on the front surface of the yoke 111, and the magnet 110.
And an annular top plate 109. At the center of the front surface of the yoke 111, a cylindrical
pole piece portion 117 is provided in a protruding manner. The pole piece portion 113 forms an
annular magnetic gap 119 with the top plate 109.
[0007]
The central portion of the frame 106 is attached to the rear surface of the yoke 111. The frame
106 supports the outer peripheral edge portion of the corn paper 101 through the flexible edge
103 at the outer peripheral edge.
[0008]
The above-mentioned corn paper 101 is formed of a material having a uniform thickness such as
paper. In the central portion of the cone paper 101, an opening closed by a cap 105 is formed.
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[0009]
The voice coil 108 is attached to the central portion of the cone paper 101 via a bobbin formed
in a cylindrical shape of an insulating material. The voice coil 108 is wound around the outer
peripheral surface portion of the bobbin. That is, the voice coil 108 has its front end attached to
the rear surface of the central portion of the cone 101. The voice coil 108 is in a state of being
protruded rearward from the cone paper 101.
[0010]
The cone paper 101 is supported at its outer peripheral edge by the frame 106 via the edge 103
to position the voice coil 108 in the magnetic gap 119.
[0011]
By the way, in the speaker apparatus as described above, particularly in the thin speaker
apparatus, the overall height of the frame 106 becomes low, and the frame 106 and the abovementioned cone paper 101 approach each other. Therefore, it is difficult to secure the slack of
the tinsel wire 114 connecting the voice coil 108 and the input terminal 115.
Therefore, in this speaker device, it is difficult to lower the lowest resonance frequency f0, and
sound reproduction in the low frequency band can not be performed well.
[0012]
Further, in this speaker device, when the amplitude of the cone paper 101 is increased, the tinsel
wire 114 may come into contact with the cone paper 101 or the like, and therefore the allowable
input can not be increased.
[0013]
Furthermore, since the overall height of the cone paper 101 is limited, sound reproduction in the
high frequency band and the low frequency band can not be performed well.
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[0014]
Therefore, the present invention is proposed in view of the above-mentioned situation, and it is
possible to reproduce a wide band sound including a high band and a low band without causing
an increase in the size of the apparatus configuration, and an allowance is also made. An object
of the present invention is to solve the problem of providing a speaker device that can increase
the input.
[0015]
SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the speaker
device according to the present invention comprises: a diaphragm supported at its peripheral
portion via a flexible edge; and a central portion of the diaphragm And a magnetic circuit having
a magnetic gap portion and a magnetic circuit for positioning the voice coil in the magnetic gap
portion, and the diaphragm is bent in the peripheral portion in the backward direction with
respect to the sound emission direction The bent portion is formed, and the bent portion and the
edge form an annular V-shaped groove portion.
[0016]
Further, according to the present invention, in the above speaker device, a damping agent is
applied to the inner wall of the annular V-shaped groove portion formed of the bent portion and
the edge.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be
described below with reference to the drawings.
[0018]
The speaker device according to the present invention, as shown in FIG. 1, is configured to have a
magnetic circuit and a frame 6 supported on the magnetic circuit.
[0019]
The magnetic circuit includes a bowl-shaped yoke 11 made of a magnetic material, and a diskshaped magnet 10 fixedly disposed on the bottom of the yoke 11 (front of the rear wall). There
is.
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A cylindrical pole piece 13 is fixedly disposed on the front surface of the magnet 10.
The pole piece 13 is coaxial with the magnet 10.
[0020]
At the front end face of the yoke 11, a disk-shaped plate 9 having a through hole at the center is
attached.
The tip end portion of the pole piece 13 is inserted into the through hole in the central portion of
the plate 9.
The inner circumferential surface of the through hole at the center of the plate 9 and the outer
circumferential surface of the tip of the pole piece 13 face each other to form a magnetic gap 19.
[0021]
The frame 6 is made of a material having sufficient rigidity, such as metal, and is formed in a
cylindrical shape whose front end side is expanded in a substantially conical shape, and its rear
end side portion is fixed to the rear surface portion of the yoke 11.
The yoke 11 is fixed by caulking the crimped portion 12 of the rear surface portion to the
through hole provided at the central portion of the frame 6.
[0022]
A peripheral portion of the cone paper 1 serving as a diaphragm is attached to the holding
portion on the front end side of the frame 6 by a gasket 4 via an edge 3.
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The edge 3 is formed with flexibility and is displaceable in the front-rear direction.
The edge 3 is formed in an annular shape, and has a shape bulging in a cylindrical surface shape
with respect to the front side (the sound emission direction). The edge 3 is formed of paper, cloth
or rubber.
[0023]
The above-mentioned cone paper 1 is composed of a substantially conical cone portion and a
dome-shaped cap 5 attached to the cone portion so as to close the through hole at the central
portion of the cone portion. The outer peripheral edge portion of the above-mentioned cone
paper 1 is bent rearward over the entire circumference. The outer peripheral edge of the cone
portion is joined to the edge 3. That is, the bent portion of the outer peripheral edge portion of
the cone paper 1 and the inner peripheral side portion of the edge 3 form an annular V-shaped
groove portion.
[0024]
Thus, in the case where the edge 3 is formed of paper or cloth on the inner wall portion of the V
groove portion formed by the bent portion of the cone paper 1 and the edge 3, a damping agent
(dumping agent) 2) is applied. As the damping agent 2, organic solvent-based “Moen 464”
(trade name), a water-soluble emulsion resin, or the like can be used. In addition, when the said
edge 3 is formed with rubber | gum, the said damping agent 2 is unnecessary.
[0025]
A bobbin is attached to the central portion of the cone paper 1 toward the rear side. The bobbin
is formed in a cylindrical shape, and its front end is attached to the center of the cone paper 1.
[0026]
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6
It is desirable that the bobbin be formed lightweight while having high rigidity. Therefore, it is
desirable that the bobbin be formed by rounding a synthetic resin material such as Bakelite
board, paper or cloth impregnated with epoxy resin, glass-epoxy board (glass fiber material
solidified with epoxy resin), etc. into a cylindrical shape. Also, the bobbin may be formed of a
metal plate, paper or the like.
[0027]
The voice coil 8 is bonded to the outer peripheral surface of the bobbin. The voice coil 8 has a
tinsel wire (lead wire) 14 and is wound and formed in a cylindrical shape. The tinsel cord 14 is
connected to an input terminal 15 provided on the frame 6 via a support member.
[0028]
The voice coil 8 is located in the magnetic gap 19. That is, the voice coil 8 is coaxial with the pole
piece 13 and enters between the pole piece 13 and the inner surface of the through hole at the
center of the plate 9.
[0029]
The front end side portion of the bobbin is connected to and supported by the rear end side
portion of the frame 6 via a flexible and vibration absorbing damper 7.
[0030]
In the speaker device configured as described above, as shown in FIG. 7, the entire height of the
above-mentioned cone paper 1 shown by the arrow h in FIG. 7 can be increased while
suppressing the overall height of the entire speaker device. The space between the paper 1 and
the frame 6 can be widened.
Therefore, in this speaker device, the slack of the tinsel wire 14 can be secured large, and the
amplitude of the cone paper 1 can be increased, so that the allowable input can be increased.
Further, in the speaker device, the attachment of the tinsel cord 14 is also facilitated.
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[0031]
Furthermore, in this speaker device, since the depth of the cone paper 1 is larger than the full
height of the speaker device, good sound reproduction can be performed in a wide frequency
band including a high frequency band and a low frequency band.
[0032]
And, in this speaker device, the circumferential direction of the support system consisting of the
edge 3 and the damper 7 and the drive system consisting of the magnetic gap 19 by the bending
portion of the outer peripheral edge of the cone paper 1 and the braking agent 2 It is possible to
prevent the rolling of the corn paper 1 resulting from the unevenness of
By preventing such rolling, the clarity of the reproduced sound is improved.
[0033]
In this speaker device, as shown in FIG. 2, the yoke 11 may be formed in a disk shape, and the
front surface portion of the yoke 11 may support the rear surface portion of the frame 6.
[0034]
In this case, a substantially cylindrical yoke portion 18 is attached to the front surface portion of
the rear wall portion of the frame 6, and the yoke portion 18 and the yoke 11 form a bowlshaped yoke.
The yoke portion 18 is positioned and attached by a yoke guide 16 provided as a recess on the
front surface of the rear wall portion of the frame 6.
[0035]
A cylindrical center pole portion 17 is integrally provided on the front surface of the yoke 11 in a
protruding manner. The magnet 10 is attached to the tip of the center pole portion 17. A pole
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piece 13 forming a magnetic gap 19 with the yoke portion 18 is attached to the front surface of
the magnet 10.
[0036]
Furthermore, in this speaker device, as shown in FIG. 3, the frame 6 may be attached to the rear
surface portion of the bowl-shaped yoke 11. In this case, the rear wall portion of the frame 6 is
formed with a frame concave portion 12 bulging back. The yoke 11 is positioned with respect to
the frame 6 by fitting the rear end side portion to the frame recess 12. The plate 9, the magnet
10 and the pole piece 13 are attached to the yoke 11 as described above.
[0037]
In this speaker device, as shown in FIG. 4, a bowl-shaped yoke may be configured by the diskshaped bottom plate 20 and the substantially cylindrical yoke 11. The frame 6 has a through
hole in the rear wall and is positioned relative to the bottom plate 20 by fitting the through hole
to a step formed in the rear surface of the bottom plate 20. The magnet 10 and the pole piece 13
are attached to the bottom plate 20.
[0038]
Further, in this speaker device, as shown in FIG. 5, a bowl-shaped yoke is constituted by a diskshaped bottom plate 20 and a substantially cylindrical yoke 11, and the frame 6 is formed on the
rear surface of the bottom plate 20. The front of the rear wall may be attached. In this case, the
rear wall portion of the frame 6 is formed with a frame concave portion 12 bulging back. The
bottom plate 20 is positioned with respect to the frame 6 by fitting the rear surface side portion
to the frame recess 12. The magnet 10 and the pole piece 13 are attached to the bottom plate
20.
[0039]
In the speaker device configured as described above, since the frame 6 is supported on the rear
side portion of the bowl-shaped yoke, the entire height of the frame 6 can be increased, and Dust
such as iron powder or the like generated at the attachment portion with the bowl-shaped yoke
can be prevented from entering the magnetic gap 19.
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[0040]
Furthermore, as shown in FIG. 6, this speaker device may be configured to include a so-called
internal magnet type magnetic circuit.
This magnetic circuit has a disk-shaped yoke 11 made of a magnetic material, and an annular
magnet 10 fixed to the front surface of the yoke 11. A cylindrical center pole portion 17 is
integrally protruded at the center of the front surface portion of the yoke 11. The center pole
portion 17 is coaxial with the magnet 10 and enters the central through hole portion of the
magnet 10.
[0041]
On the front surface of the magnet 10, a disk-shaped plate 9 having a through hole at its central
portion is attached. The tip end side portion of the center pole portion 17 is inserted into the
through hole in the central portion of the plate 9. The inner circumferential surface of the
through hole at the center of the plate 9 and the outer circumferential surface of the tip of the
center pole 17 face each other to form a magnetic gap 19.
[0042]
The frame 6 is made of a material having sufficient rigidity, such as metal, and is formed in a
cylindrical shape whose front end side is expanded in a substantially conical shape, and its rear
end side portion is fixed to the front surface portion of the plate 9.
[0043]
A peripheral portion of the cone paper 1 serving as a diaphragm is attached to the holding
portion on the front end side of the frame 6 by a gasket 4 via an edge 3.
The edge 3 is formed with flexibility and is displaceable in the front-rear direction. The edge 3 is
formed in an annular shape and has a shape bulging in a cylindrical surface shape with respect
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to the front side (the sound emitting direction). The edge 3 is formed of paper, cloth or rubber.
[0044]
The above-mentioned cone paper 1 is composed of a substantially conical cone portion and a
dome-shaped cap 5 attached to the cone portion so as to close the through hole at the central
portion of the cone portion. The outer peripheral edge portion of the above-mentioned cone
paper 1 is bent rearward over the entire circumference. The outer peripheral edge of the cone
portion is joined to the edge 3. That is, the bent portion of the outer peripheral edge portion of
the cone paper 1 and the inner peripheral side portion of the edge 3 form an annular V-shaped
groove portion.
[0045]
Thus, in the case where the edge 3 is formed of paper or cloth on the inner wall portion of the V
groove portion formed by the bent portion of the cone paper 1 and the edge 3, the damping
agent (dump Agent 2 is applied.
[0046]
A bobbin is attached to the central portion of the cone paper 1 toward the rear side.
The bobbin is formed in a cylindrical shape, and its front end is attached to the center of the cone
paper 1.
[0047]
The voice coil 8 is bonded to the outer peripheral surface of the bobbin. The voice coil 8 has a
tinsel wire (lead wire) 14 and is wound and formed in a cylindrical shape. The tinsel cord 14 is
connected to an input terminal 15 provided on the frame 6 via a support member.
[0048]
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The voice coil 8 is located in the magnetic gap 19. That is, the voice coil 8 is coaxial with the
center pole portion 17 and enters between the center pole portion 17 and the inner surface
portion of the through hole at the central portion of the plate 9.
[0049]
The front end side portion of the bobbin is connected to and supported by the rear end side
portion of the frame 6 via a flexible and vibration absorbing damper 7.
[0050]
As described above, in the speaker device according to the present invention, the overall height
of the diaphragm can be increased while the overall height of the entire speaker device is
suppressed, so the distance between the diaphragm and the frame is wide. can do.
Therefore, in this speaker device, the slack of the tinsel wire can be secured large, and the
amplitude of the diaphragm can be increased, so that the allowable input can be increased. In
addition, in the speaker device, the attachment of the tinsel cord is also facilitated.
[0051]
Furthermore, in this speaker device, since the depth of the diaphragm is larger than the full
height of the speaker device, good sound reproduction can be performed in a wide frequency
band including the high frequency band and the low frequency band.
[0052]
And, in this speaker device, the diaphragm which is generated from the circumferential nonuniformity of the drive system consisting of the support system consisting of the edge and the
damper and the magnetic gap by the bending portion at the outer peripheral edge of the
diaphragm Can be prevented from rolling.
By preventing such rolling, the clarity of reproduced sound can be improved.
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[0053]
That is, according to the present invention, it is possible to provide a speaker device capable of
wide-range sound reproduction including high band and low band without causing an increase in
size of the device configuration, and capable of increasing the allowable input. is there.
[0054]
Brief description of the drawings
[0055]
1 is a longitudinal sectional view showing a first configuration of the speaker device according to
the present invention.
[0056]
2 is a longitudinal sectional view showing a second configuration of the speaker device according
to the present invention.
[0057]
3 is a longitudinal sectional view showing a third configuration of the speaker device according
to the present invention.
[0058]
4 is a longitudinal sectional view showing a fourth configuration of the speaker device according
to the present invention.
[0059]
5 is a longitudinal sectional view showing a fifth configuration of the speaker apparatus
according to the present invention.
[0060]
6 is a longitudinal sectional view showing a sixth configuration of the speaker device according
to the present invention.
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[0061]
7 is a longitudinal sectional view showing the shape of the cone paper and the edge of the above
speaker device.
[0062]
8 is a longitudinal sectional view showing a first example of the conventional speaker device.
[0063]
9 is a longitudinal sectional view showing a second example of the conventional speaker device.
[0064]
10 is a longitudinal sectional view showing a third example of the conventional speaker device.
[0065]
11 is a longitudinal sectional view showing a fourth example of the conventional speaker device.
[0066]
12 is a longitudinal sectional view showing a fifth example of the conventional speaker device.
[0067]
Explanation of sign
[0068]
Reference Signs List 1 cone paper 2 dumping agent 5 cap 8 voice coil 9 plate 10 magnet 11 yoke
13 pole piece 19 magnetic gap
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