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JPH04355600

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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 JPH04355600
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is directed to
an audio driven speaker in addition to an audio reproduction effect by air propagation from the
speaker in order to make it possible to feel the deep bass more ideally. Among the signals, for
example, a low-range audio signal of 150 Hz or less is converted to mechanical vibration, and
this is sensed in synchronization with the speaker reproduction to generate mechanical vibration
for enhancing realism. The present invention relates to a magnetic circuit member support
structure in a vibration unit.
[0002]
2. Description of the Related Art Conventionally, in a vibration unit of this type, a magnetic air
gap is formed by a yoke having a magnetic pole, a voice coil is disposed in the air gap, and a low
voltage is applied to the voice coil. It has been proposed to obtain mechanical vibration by
magnetic interference generated between the magnetic force generated in the voice coil with the
audio signal in the range and the magnetic force of the magnetic pole.
[0003]
As one means for propagating (outputting) the mechanical vibration of the vibration unit to the
diaphragm or the like, the yoke is held in the case main body of the vibration unit via a damper,
and the yoke and the case main body are displaced relative to each other. There is a structure in
which the case body is attached to a diaphragm or the like as an attachment member to output
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mechanical vibration.
(See, for example, Japanese Patent Publication No. 58-9640.) As in this vibration unit, one having
a structure that outputs mechanical vibration through the case main body can move the yoke in
the case main body in the direction of vibration. Need to hold. As a holding means of this yoke,
one by a single damper positioned so as to be horizontal to the voice coil in a plane including the
air gap where the voice coil is located (see, for example, Japanese Patent Publication No. 589640) Or two dampers (see, for example, JP-B-62-33799).
[0004]
Furthermore, as another yoke holding means, one having a structure for holding the yoke using a
spring member provided in the case main body (see, for example, JP-A-61-67400), or this spring
member may be used. There is a structure bent in a U-shape (see, for example, JP-A-63-197198,
in particular, see FIG. 3 and its description).
[0005]
SUMMARY OF THE INVENTION In a conventional vibration unit having a structure in which a
yoke is held in a case main body through a single ring-shaped damper, a magnet, a yoke, etc. are
used to form a magnet. Since the positional relationship between the circuit member and the
voice coil is held by a single ring-shaped damper, the voice coil and the magnetic circuit member,
which are always displaced relatively in the direction of vibration, do not vibrate when vibration
occurs. Misalignment with the direction of vibration, that is, twisting, causes problems such as
contact between the voice coil and the yoke of the magnetic circuit member to generate
abnormal noise.
In particular, unlike a general speaker that vibrates a lightweight voice coil, this is a big problem
in a structure that vibrates a heavy magnetic circuit member.
[0006]
As one means for solving such a problem, it is conceivable to absorb the above-mentioned
positional deviation by setting a wide gap between the voice coil and the yoke and the pole piece
in advance. However, widening the gap between them reduces the magnetic influence on each
other, affecting the electromagnetic performance, with the disadvantage that the excitation
efficiency is significantly reduced.
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[0007]
In order to solve such problems, a structure is proposed which uses two dampers to support
magnetic circuit components such as a yoke by this, but in such a structure, May cause abnormal
vibration due to the resonance of the dampers.
[0008]
As another magnetic circuit member supporting structure by other means, there is a structure in
which a ring-shaped spring member is attached to the outer periphery of the yoke and the yoke
is supported by the case main body by the ring-shaped spring member. This also has the
disadvantage that the voice coil and the magnetic circuit member may be misaligned with respect
to the non-excitation direction, as in the above-described structure using one damper.
If the ring-shaped spring member is thickened in order to eliminate this problem, the vibration
operation of the magnetic circuit member will be suppressed, and in addition to the deterioration
of the excitation efficiency, there is a disadvantage that the resonance frequency f0 becomes
high.
[0009]
Further, in the structure in which the yoke is suspended from the spring member bent in a Ushape, since the one end portion of the U-shaped spring material is attached to the inside of the
case main body, the suspension is suspended. At the time of vibration operation of the yoke, the
spring member is biased in the mounting direction, and therefore, the yoke may come in contact
with the voice coil to generate noise.
In addition, since the yoke is suspended by a spring member, the positioning with the voice coil is
very difficult, and it is easily affected by an external impact, and the case body becomes large,
and in particular, downsizing is required. It is unsuitable as a vibration unit used for the body
sensation system for motor vehicles.
[0010]
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The present invention provides a novel magnetic circuit member support structure that solves
various problems with the conventional magnetic unit support structure of the vibration unit, and
it is possible to apply a relatively constant force at the time of excitation. Deviation of the
positional relationship between the yoke and voice coil that fluctuates in the vibration direction
with respect to the non-excitation direction, that is, prevention of the twisting phenomenon,
improvement of the excitation efficiency and vibration propagation efficiency, and sufficient
acquisition of deep bass vibration It is an object of the present invention to provide a magnetic
circuit member support structure of a vibration unit capable of
[0011]
In order to achieve the above object, in the magnetic circuit member supporting structure of a
vibrating unit according to the present invention, one end of an elongated flat plate damper
attached with a yoke having a magnetic pole is provided. The part is separated from the frame to
be firmly supported, and the other end part is supported so as to be able to swing in the vibration
direction via the damper material.
One end portion of the plate damper is configured to be firmly supported by being pinched by
the ridge line portion of the mountain-shaped support member. This configuration is attached to
a portion of the frame opposite to the lower surface of one end of the plate damper, and has a
mountain-shaped first support member formed to support the lower surface of the one end with
a ridgeline portion; A mountain-shaped second support member disposed opposite to the support
member and configured to press the upper surface at one end with a ridge line portion, screwed
into the second support member and penetrate the ridge line portion, and a plate And a screw
inserted in a non-contact manner into a hole provided at one end of the damper and screwed into
the ridge portion of the first support member. In addition, the other end of the plate damper is
surrounded by a damper material which is thick in the vibration direction and thin in the nonvibration direction, and the periphery of the damper material is fixed by a holding member
attached to the frame. Configured.
[0012]
When a low frequency range audio signal is applied to the voice coil of the vibration unit, a
magnetic force is generated in the voice coil along with the applied audio signal, and magnetic
interference occurs between the voice coil and the magnetic force of the magnetic pole. The
mechanical vibration is generated due to relative displacement between the yoke supported by
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the elongated plate damper and the frame on which the voice coil is mounted. At this time, the
plate damper has one end firmly supported and the other end swingably supported via the
damper material, so that the one end is fulcrum according to the vibration operation of the yoke
attached to the central portion. It oscillates in the direction of vibration and generates mechanical
vibration.
[0013]
EXAMPLES Examples will be described with reference to the drawings. FIG. 1 is a cross-sectional
view showing an example of a vibration unit in which the magnetic circuit member support
structure of the present invention is implemented, and FIG. 2 is a perspective view with a part cut
away. A frame 1 having a U-shaped cross section is made of a metal such as aluminum and
elongated in the lateral direction. A voice coil 2 is disposed inwardly at the center of the frame 1.
The voice coil 2 is wound around the bobbin 3, and the insulating substrate 4 fitted and attached
to the bobbin 3 is attached to the fixing plate 5. By moving and adjusting the mounting position
of the fixed plate 5 to the frame 1, the voice coil 2 can be correctly disposed in the magnetic gap
of the yoke 6. Reference numeral 7 denotes a terminal connected to the voice coil 2. The audio
signal in the low frequency range applied to the terminal 5 is supplied to the voice coil 2.
[0014]
Next, the yoke 6 provided with the magnet 8 will be described. The yoke 6 is formed of a
cylindrical member having a concave cross section, and is fixed in a state in which the magnet 8
is loosely fitted at the inner center position thereof. Therefore, a magnetic annular gap is formed
between the outer periphery of the magnet 8 and the inner wall surface of the cylindrical
member having a concave cross section, and a magnetic circuit is configured. The voice coil 2 is
disposed in the air gap. The yoke 6 is fixed to the central portion of the plate damper 9 so that
the voice coil 2 can be always positioned at the correct position in the air gap.
[0015]
The plate damper 9 has a rectangular cross-sectional shape in order to prevent twisting in the
non-oscillating direction, and is a plate-like elastic material having a sufficient thickness, such as
an elongated flat aluminum, brass or stainless steel. It is formed of The plate damper 9 is
positioned so as to be horizontal to the voice coil 2, and its both ends 9 A and 9 B are disposed
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apart from the frame 1.
[0016]
Next, an embodiment of the support structure of the plate damper 9 in which the magnetic
circuit member consisting of the yoke 6 provided with the magnet 8 is fixed to the central
portion will be described based on FIGS. First, one embodiment of a structure for supporting the
one end 9A of the plate damper 9 will be described based on the cross-sectional view of the main
part of FIG. The structure for supporting the one end 9A of the plate damper 9 shown in FIG. 3 is
constituted by the following portions. That is, a first support member 10 having a mountain
shape (in this embodiment, a wedge shape in this embodiment) is attached to the portion of the
frame 1 facing the lower surface of one end 9A, and the lower surface of one end 9A is a ridge
portion 10A. It is provided to support. The first support member 10 is disposed such that the
ridge line portion 10A is orthogonal to the plate damper 9. A second support member 11 having
a mountain shape (in this embodiment, a wedge shape in this embodiment) is disposed opposite
to the first support member 10 on the upper surface of one end 9A, and the upper surface of one
end 9A is a ridge line portion 11A It is provided to be pressed with. Reference numeral 12
denotes a hole provided at one end 9A, and 13 denotes a screw, which is screwed from the upper
surface of the second support member 11 and penetrates toward the ridge line portion 11A, and
further does not contact the hole 12 provided at one end 9A. And threaded into the ridge portion
10A of the first support member 10. Thus, one end 9A of the plate damper 9 is sandwiched
between the ridgeline portion 10A of the first support member 10 and the ridgeline portion 11A
of the second support member 11, and is firmly supported by the screw 13. The shapes of the
ridge portions 10A and 11A of the first support member 10 and the second support member 11
may be more V-shaped.
[0017]
Next, one embodiment of a structure for supporting the other end 9B of the plate damper 9 will
be described based on the cross-sectional view of the main part shown in FIG. 4 and the left side
view of the cross-section of the main part shown in FIG. The structure for supporting the other
end 9B of the plate damper 9 shown in FIGS. 4 and 5 is the upper and lower surfaces of the other
end 9B of the plate damper 9, that is, the damper material 14A formed thick in the vibration
direction A portion 14B is disposed, and in the non-oscillating direction, portions of the damper
members 14C and 14D formed thin are disposed so as to wrap the other end 9B of the plate
damper 9. Further, the damper members 14A, 14B and 14C, 14D are fixed at their peripheries by
the holding members 15 attached to the frame 1. Therefore, the other end 9B of the plate
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damper 9 can be swung in the excitation direction along with the vibration operation of the
magnetic circuit member such as the yoke 6, etc. Further, in the non-oscillation direction, the
damper material 14C , 14D is thin and is position-controlled by the holding member 15
positioned outside the same, so the movement of the plate damper 9 in the non-excitation
direction is suppressed and abnormal noise due to contact between the voice coil 2 and the yoke
6 The occurrence can be reliably prevented. Damper materials 14A-14D may be formed in one,
and may be divided and formed individually.
[0018]
In the vibration unit having the support structure configured as described above, when an audio
signal of, for example, a low frequency band is applied to the voice coil 2, a magnetic force is
generated in the voice coil based on the applied audio signal. Due to the magnetic interference
generated between the magnetic force of the voice coil 2 and the magnetic force of the magnet 8,
the yoke 6 supported by the plate damper 9 is displaced relative to the frame 1 to which the
voice coil 2 is attached. Vibration can be generated. At this time, the plate damper 9 swings the
other end 9B in the vibration direction with the one end 9A firmly supported as a fulcrum. This
mechanical vibration is propagated to the whole of the frame 1 so that the vibration can be
output from the side located in the vibration direction of the frame 1.
[0019]
As described above, according to the magnetic circuit member supporting structure of the
present invention, since the yoke can be fixed in advance to the central portion of the elongated
flat plate damper, it is horizontal to the voice coil. By simply supporting both ends of the plate
damper to the frame as described above, the mounting position of the yoke can be determined,
and the positional relationship can be determined accurately and quickly. In addition, one long
flat plate-shaped plate damper with the yoke fixed at the center is positioned horizontally to the
voice coil, and one end of the plate damper is firmly supported, and the other end is damper
material Since it is supported so as to be able to swing in the direction of vibration through the
support, it is possible to suppress the displacement of the yoke in the non-vibration direction,
and to prevent the yoke from coming into contact with the voice coil. The yoke can be stably
vibrated with respect to the voice coil.
[0020]
Further, in the case of the conventional structure in which only one end portion is fixed, the
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resonance frequency characteristic of the vibration is a sharp resonance characteristic
determined by the mass of the magnetic circuit member and the spring material supporting it. As
in the magnetic circuit member supporting structure of the invention, the elasticity of the damper
material is achieved by firmly supporting one end and supporting the other end so as to be able
to swing in the vibration direction via the damper material. By selecting the rate, it has become
possible to obtain vibration characteristics with constant amplitude in a wide frequency band.
[0021]
Brief description of the drawings
[0022]
1 is a cross-sectional side view showing an embodiment of the magnetic circuit member support
structure of the present invention.
[0023]
2 is a partially cut away perspective view of the embodiment shown in FIG.
[0024]
3 is a cross-sectional side view of an essential part showing one embodiment of the magnetic
circuit member support structure of the present invention.
[0025]
4 is a cross-sectional side view of an essential part showing one embodiment of the magnetic
circuit member support structure of the present invention.
[0026]
5 is a sectional left side view of the embodiment shown in FIG.
[0027]
Explanation of sign
[0028]
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1はフレームである。
2はボイスコイルである。
4 is an insulating substrate.
5 is a fixed plate.
6はヨークである。
7 is a terminal.
8はマグネットである。
9はプレートダンパである。
9A is one end. 9B is the other end. 10 is a first support member. 10A is a ridgeline portion. 11 is
a second support member. 11A is a ridgeline portion. 12 is a hole. 13はネジである。 14A, 14B,
14C, 14D are damper materials. 15 is a holding member.
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