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JP2000197185

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DESCRIPTION JP2000197185
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
buzzer speaker suitable for being incorporated in a visor of a car.
[0002]
2. Description of the Related Art In recent years, audio equipment such as car stereos have been
attached to most cars, and music is enjoyed even when driving.
[0003]
However, the speakers of this type of audio equipment are attached to the rear of the rear seat
and the lower inside of the door panel from the viewpoint of easy installation space.
[0004]
Therefore, since a sound is heard from the back and the lower part of the occupant, there is a
problem that it is uncomfortable and difficult to hear.
Therefore, it has been proposed to incorporate a thin speaker in the visor.
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1
[0005]
As a speaker built in a visor of a car (hereinafter, referred to as a speaker for a visor in the
present specification), a full-drive speaker S described in Japanese Utility Model Application
Publication No. 58-19812 as shown in FIG. 5 has been proposed. There is.
[0006]
In the figure, the speaker S has a predetermined spacing on the upper surface of a flat plate-like
yoke plate 3 made of iron or other magnetic material, and mutually adjacent and mutually
adjacent magnetic pole surfaces are alternately magnetized to N and S different polarities. A
plurality of rod-like permanent magnets 4 are disposed, and air holes 6 are provided between the
permanent magnets 4 and 4 in order to release the back pressure generated when the diaphragm
5 is driven.
[0007]
The air hole 6 also functions as a sound hole.
A support frame 7 for fixing the diaphragm 5 is disposed around the yoke plate 3, and the
diaphragm 5 made of a flexible insulating material such as polyester or polyimide is viewed from
the pole face above the permanent magnet 4. It is suitably fixed to the support frame 7 by a
clamp etc. so that it may be located slightly apart.
[0008]
A voice coil 8 is formed on the upper surface of the diaphragm 5 by electric wire or etching, etc.,
and the magnetic flux generated between the pole faces of adjacent permanent magnets 4 and 4
adjacent to each other crosses at right angles via a space. When the current flows in the voice
coil 8, a propulsive force is generated in the voice coil 8 due to the left-hand rule of Fleming, and
thus the diaphragm 5 is generated. Vibrates and the sound is emitted to the outside through the
saran net 9.
[0009]
However, in the full drive speaker of the above configuration, the stroke of the diaphragm 5 is
short, so that there is a problem that the reproduction of the low tone range is not sufficient.
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2
[0010]
The present invention has been made in view of the above-mentioned problems, and an object
thereof is to provide a visor speaker capable of reproducing to a low frequency range.
[0011]
The invention according to claim 1 which solves the above-mentioned problems comprises a
diaphragm and a magnetic circuit supported by a suspension and for driving the diaphragm. It is.
[0012]
Since the magnetic circuit is supported by the suspension, the vibration of the lowest resonance
frequency determined by the mass of the magnetic circuit and the rigidity of the suspension can
also be used, so that the bass region can be reproduced well.
[0013]
In the invention of claim 1, the magnetic circuit may be attached to the diaphragm via a
suspension as in the invention of claim 2, and as in the invention of claim 3, a frame via the
suspension. It may be attached to
[0014]
When the magnetic circuit is attached to the diaphragm via the suspension, the diaphragm
preferably has a honeycomb structure as in the invention according to claim 4, from the
viewpoint of increasing the strength of the diaphragm.
[0015]
DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention
will be described with reference to the drawings.
(1) First Embodiment A description will be given using FIGS. 1 to 3.
FIG. 1 is a sectional view of a visor speaker according to a first embodiment, FIG. 2 is a top view
of FIG. 1, and FIG. 3 is an enlarged view of a magnetic circuit portion of FIG.
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[0016]
As shown in FIG. 1, a substantially rectangular diaphragm 107 is provided on the peripheral edge
of the frame 103 in which the concave portion 101 is formed on the bottom surface of which
one surface is open, with the support frame 105 of the diaphragm interposed. .
The diaphragm 107 of the present embodiment is made of paper, and uses a lightweight, highstiffness honeycomb-structured diaphragm.
[0017]
A cylindrical support member 109 is provided substantially at the center of the diaphragm 107,
and an outer peripheral portion of an annular suspension 111 is attached to the support member
109.
A cylindrical first yoke 121, which is located in the recess 101 of the frame 103 and whose one
surface is open, is attached to the inner peripheral portion of the suspension 111.
[0018]
On the inner bottom surface of the first yoke 121, a permanent magnet 123 set to an outer
diameter smaller than the diameter of the inner surface of the first yoke 121 and a second yoke
125 are stacked.
[0019]
Therefore, the magnetic circuit 127 is configured by the first yoke 121, the permanent magnet
123, and the second yoke 125.
Furthermore, as shown in FIG. 3, in the diaphragm 107, a gap (magnetic gap) between the inner
peripheral surface of the first yoke 121 of the magnetic circuit 127 and the peripheral surfaces
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of the permanent magnet 123 and the second yoke 125. ), And a bobbin 133 around which a coil
131 is wound is provided on the outer peripheral surface.
[0020]
As shown in FIG. 2, a lid 141 is provided to close the frame 103.
A plurality of sound holes 143 are formed in the lid 141 at predetermined intervals.
The operation of the above configuration will be described.
[0021]
When current flows through the coil 131, propulsive force is generated in the coil 131 due to
Fleming's left-hand rule, whereby the diaphragm 107 vibrates and sound is emitted to the
outside through the sound hole 143 of the lid 141. Ru.
[0022]
According to the above configuration, since the magnetic circuit 127 is supported by the
suspension 111 whose outer peripheral portion is attached to the diaphragm 107, vibration of
the lowest resonance frequency determined by the mass of the magnetic circuit 127 and the
rigidity of the suspension 111 can also be used. It can reproduce well to the range.
[0023]
In addition, since the diaphragm 107 has a light weight and high rigidity honeycomb structure,
the heavy magnetic circuit 127 can be supported.
(2) Second Embodiment A second embodiment will be described with reference to FIG.
In the present embodiment, only the suspension portion of the first embodiment is changed, so
the same reference numerals as in FIGS. 1 to 3 showing the first embodiment denote the same
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parts. , Their explanation is omitted.
[0024]
The magnetic circuit 127 is attached to the inner periphery of the suspension 201 whose outer
periphery is attached to the frame 103.
Even in such a configuration, since the magnetic circuit 127 is supported by the suspension 111
whose outer peripheral portion is attached to the frame 103, the vibration of the lowest
resonance frequency determined by the mass of the magnetic circuit 127 and the rigidity of the
suspension 201 can also be used. You can play well.
[0025]
As described above, according to the visor speaker of the present invention, by supporting the
magnetic circuit with the suspension, the vibration of the lowest resonance frequency determined
by the mass of the magnetic circuit and the stiffness of the suspension can also be used. It is
possible to reproduce well to the low frequency range.
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