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DESCRIPTION JP2005203946

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DESCRIPTION JP2005203946
PROBLEM TO BE SOLVED: A speaker capable of reducing vibration propagation to a frame or the
like with a simple configuration, and adjusting the stiffness of a vibrating portion of the speaker
to change the low frequency resonance frequency f or the sound pressure level. To provide.
SOLUTION: In the speaker 10 provided with a vibrating portion 30 supported at one end by the
frame 40 and at the other end in the magnetic gap G of the magnetic circuit portion 20, the
bobbin 33 of the vibrating portion 30 is a magnetic circuit portion 20. It is supported via the
viscous fluid 50 filled in the gap with the support part 21c provided in. [Selected figure] Figure 1
スピーカ
[0001]
The present invention relates to a speaker, and more particularly to a speaker capable of
reducing the propagation of vibration to a frame or the like.
[0002]
FIG. 10 is a side sectional view schematically showing the structure of a conventional speaker.
The speaker 100 is configured to include a magnetic circuit unit 200, a vibrating unit 300 and a
frame 40. The magnetic circuit portion 200 includes a yoke 21 formed of a magnetic material
such as iron, an annular magnet 22 disposed on the front side of the yoke 21, and an annular top
plate disposed on the front side of the magnet 22. And 23 are included. The yoke 21 is formed of
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a cylindrical center pole 21a and a back plate 21b.
[0003]
The vibrating portion 300 includes a diaphragm 31 having a substantially conical shape, an edge
32 adhesively fixed to the front end of the diaphragm 31, and a cylindrical bobbin adhesively
fixed to the rear end of the diaphragm 31. 33, a voice coil 34 wound around the outer periphery
of the bobbin 33, an annular damper 35 adhesively fixed to the bobbin 33 and the frame 40, and
a center cap 36 for capping the central portion of the diaphragm 31. It is configured.
[0004]
The frame 40 is a frame member for fixing the magnetic circuit unit 200 and the vibrating unit
300, and is formed in a substantially truncated cone shape.
The front opening of the frame 40 is adhesively fixed to the diaphragm 31 via the edge 32, and
the rear side of the frame 40 is adhesively fixed to the top plate 23 of the magnetic circuit unit
200. A hole (not shown) for adjusting the back pressure of the diaphragm 31 is formed at a
predetermined position on the wall surface.
[0005]
Such a speaker 100 can be attached by fixing the outer peripheral portion of the frame 40 to an
opening provided in a cabinet (not shown) such as a cabinet. When the speaker 100 is driven
(the electric signal is supplied to the voice coil 34), the driving force acts on the voice coil 34 in
the magnetic gap G, the diaphragm 31 is displaced, and a sound wave is emitted from the
diaphragm 31 to the surroundings. At this time, the amplitude energy of the vibration unit 300
propagates to the frame 40 supporting the vibration unit 300, and the amplitude energy also
propagates to the housing via the frame 40, so that the entire housing vibrates.
[0006]
The magnitude of the vibration of the housing varies depending on the driving ability of the
vibrating portion 300, the weight of the vibrating portion 300, the vibration propagation rate of
the frame 40 and the housing, etc. This vibration becomes larger as the speaker is.
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[0007]
When the vibration of the case becomes large, the vibration propagates to the floor or wall on
which the case is installed, and the vibration of the floor or wall leaks out as sound, causing a
problem of noise other than the listener.
In addition, when the vibration of the case becomes large, the required performance of the case
support such as a speaker stand on which the case is mounted is increased in order to make it
difficult to transmit the vibration, and a stronger structure is required. There is also a problem
that it leads to the increase in cost and weight of
[0008]
In the case of the speaker 100 shown in FIG. 10, there are two places where the amplitude
energy of the vibrating part 300 directly propagates to the frame 40 supporting the vibrating
part 300, the edge 32 and the damper 35. With regard to the edge 32, various measures have
been made to reduce the propagation of vibration, and for example, a double-edge structure in
which cushion members are provided on the upper and lower sides of the outer periphery of the
diaphragm 31 and connected to the frame 40. An edgeless structure or the like is known, in
which an outer peripheral portion 31 and a frame 40 are provided with a slit.
[0009]
On the other hand, the damper 35 prevents swinging in the direction perpendicular to the
movable direction of the diaphragm 31, ie, so-called rolling, and also functions to hold the
vibrating portion 300 at the center position of the speaker. When using ones, there is a problem
that the centering function becomes weak and the rolling becomes large and the sound is
distorted.
[0010]
On the other hand, Patent Document 1 below discloses a loudspeaker that does not use a
damper, in which the vibrating portion operates stably on the central axis of the loudspeaker, and
more specifically, on the inner circumferential portion of a ring-shaped magnet It has a magnetic
suspension mechanism in which a cylindrical magnet is movably disposed so as to always
stabilize at a balanced position of magnetic flux, and the vibrating portion and the magnetic
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suspension mechanism are integrally connected by a joint rod, Are stably held on the central axis
of the magnetic circuit unit.
[0011]
However, the speaker described in Patent Document 1 has a problem that a magnetic suspension
mechanism using a plurality of magnets is provided, which complicates the structure and
increases the cost of parts.
Further, the speaker 100 and the speaker described in Patent Document 1 do not have the
function of adjusting the stiffness of the vibrating portion, and can not change the low-pass
resonant frequency f0 or the sound pressure level. It was difficult to adjust the sound and adjust
it according to the user's preference.
JP 2001-186588 A
Means for solving the problem and its effect
[0012]
The present invention has been made in view of the above problems, and it is possible to reduce
the vibration propagation to a frame or the like with a simple configuration, and to adjust the
stiffness of the vibrating portion of the speaker, so that the low resonance frequency f0. The
purpose is to provide a speaker that can change the sound pressure level.
[0013]
In order to achieve the above object, a speaker (1) according to the present invention is a speaker
provided with a vibrating portion having one end supported by the frame and the other end
disposed in the magnetic gap of the magnetic circuit portion. The other end portion is
characterized by being supported via a viscous fluid filled in a gap with a support portion
provided in the magnetic circuit portion.
[0014]
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According to the speaker (1), since the other end portion of the vibrating portion is supported via
the viscous fluid filled in the gap with the support portion provided in the magnetic circuit
portion, the conventional speaker As described above, even without using the damper member
for holding the other end of the vibrating portion at the central position, the vibrating portion
can be held at the central position so as to be drivable in the movable direction. Vibration
propagation to the ground can also be reduced.
Therefore, the vibration transmitted to the housing in which the speaker is installed can be
reduced, and the leakage of sound transmitted from the housing to the outside can be reduced.
Further, since the vibration transmitted to the housing can be reduced, the required performance
of the housing support such as the speaker stand can be alleviated, and the material cost of the
housing support can be reduced and the weight can be reduced. . Further, when a damper
member is used as in the conventional speaker, there is a possibility that the damper member
may be damaged by repeated fatigue due to the amplitude operation of the vibrating portion, but
the other end portion of the vibrating portion The durability of the speaker can also be improved
since it is supported via the viscous fluid.
[0015]
In the speaker (2) according to the present invention, the auxiliary vibration connected to the
vibration unit is provided in the speaker including the vibration unit having one end supported
by the frame and the other end disposed in the magnetic gap of the magnetic circuit unit. Part
and a support part provided in the magnetic circuit part via the auxiliary vibration part and a
gap, and a part of the auxiliary vibration part is filled with the viscous fluid filled in the gap with
the support part. It is characterized by being supported via
[0016]
According to the speaker (2), a part of the auxiliary vibration portion is supported via the viscous
fluid filled in the gap with the support portion provided in the magnetic circuit portion, so that
the speaker (1) Similar effects can be obtained, and the strength of the vibrating portion can be
reinforced by the auxiliary vibrating portion, and the stability of the amplitude operation of the
vibrating portion can be enhanced.
[0017]
In the speaker (3) according to the present invention, the auxiliary vibration connected to the
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vibration unit is provided in the speaker including the vibration unit having one end supported
by the frame and the other end disposed in the magnetic gap of the magnetic circuit unit. And a
plurality of support portions provided in the magnetic circuit portion with a gap between the
other end portion of the vibration portion and the auxiliary vibration portion, and the other end
portion of the vibration portion and the auxiliary vibration portion It is characterized in that a
part is supported via a viscous fluid filled in a gap with these supports.
[0018]
According to the speaker (3), since the other end portion of the vibrating portion and a part of
the auxiliary vibrating portion are supported via the viscous fluid filled in the gap with the
support portion, the speaker (3) The effect substantially similar to that of 1) can be obtained, and
by being fluid-supported at a plurality of locations, the load applied to the vibration unit can be
dispersed, and the effect of reducing the lateral displacement of the vibration unit can be
enhanced. it can.
Further, the strength of the vibrating portion can be reinforced by the auxiliary vibrating portion.
[0019]
In the loudspeaker (4) according to the present invention, in any one of the loudspeakers (1) to
(3), the viscous fluid includes a first viscous fluid and a second viscous fluid having a viscosity
higher than that of the first viscous fluid. The first viscous fluid with the second viscous fluid at
the opposite surface to the other end of the vibrating portion and / or a portion of the auxiliary
vibrating portion. It is characterized in that it is provided with a plurality of uneven portions for
filling in a sandwiched state.
[0020]
According to the speaker (4), the first viscous fluid may be used as the second viscous fluid on
the other surface of the other portion of the vibrating portion and / or the opposing surface to a
part of the auxiliary vibrating portion. Since the plurality of concavo-convex portions for filling in
a sandwiched state are provided, the first viscous fluid is sandwiched between the second viscous
fluid in the movable direction of the vibrating portion in the plurality of concavo-convex portions.
While being able to be filled in an elastic state, it is possible to reduce the frictional resistance of
the vibrating portion and to prevent the leakage of the first viscous fluid.
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[0021]
In the loudspeaker (5) according to the present invention, in any of the loudspeakers (1) to (4),
the supporting portion is disposed in a state in which the other end portion of the vibrating
portion is sandwiched. It is assumed.
According to the speaker (5), the support portion is disposed in a state of sandwiching the other
end portion of the vibrating portion, so lateral displacement of the vibrating portion can be
suppressed, and the positional accuracy of the vibrating portion Can increase
[0022]
Further, the speaker (6) according to the present invention is characterized in that any one of the
speakers (1) to (5) includes a displacement amount regulating means for regulating the
displacement amount of the vibrating portion in the movable direction. doing.
According to the speaker (6), since the displacement amount control means for restricting the
displacement amount of the vibrating portion in the movable direction is provided, when the
displacement amount of the vibrating portion in the movable direction is large, the driving force
is When it is large, it is possible to prevent the vibration portion from being overdumped, and the
vibration portion does not return to its original position due to a large amplitude greater than the
durability strength of the edge portion provided at one end of the vibration portion. It is possible
to eliminate such phenomena and to delay the deterioration of the edge portion.
[0023]
In the loudspeaker (7) according to the present invention, in any one of the loudspeakers (1) to
(6), pressure adjustment for changing the filling pressure of the viscous fluid and / or
replacement of the viscous fluid Characterized in that it comprises means.
According to the speaker (7), since the pressure adjustment / replacement means is provided, it
is possible to adjust the filling pressure of the viscous fluid and / or replace or refill the viscous
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fluid, and the vibration unit Thus, it is possible to adjust the low-frequency resonance frequency
f0 and the sound pressure level appropriately.
[0024]
The speaker (8) according to the present invention is characterized in that, in the speaker (7), the
pressure adjustment / replacement means is constituted by a mechanical mechanism which can
be operated manually.
According to the speaker (8), since the pressure adjustment / replacement means is constituted
by a mechanical mechanism that can be operated manually, adjustment and replacement of the
filling pressure of the viscous fluid can be facilitated by manual operation. And can be configured
with low cost mechanisms.
[0025]
The speaker (9) according to the present invention is characterized in that, in the abovementioned speaker (7), the pressure adjustment / replacement means includes a mechanism for
electrically driving. According to the speaker (9), since the pressure adjustment / replacement
means is configured to include the electrically driven mechanism, for example, a combination of a
driver such as a small motor, a gear mechanism, etc. By using it, adjustment of the filling
pressure of the viscous fluid can be easily performed from the outside with high accuracy
without disassembling the speaker.
[0026]
Hereinafter, an embodiment of a speaker according to the present invention will be described
based on the drawings. FIG. 1 is a view schematically showing the structure of the loudspeaker
according to the embodiment (1), wherein (a) is a side sectional view and (b) is a partially
enlarged sectional view around the bobbin 33 in (a). is there. However, here, components having
the same functions as those of the conventional speaker 100 shown in FIG. 10 are denoted by
the same reference numerals.
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[0027]
The speaker 10 is configured to include a magnetic circuit unit 20, a vibrating unit 30 and a
frame 40. The magnetic circuit unit 20 is a cylindrical support pole formed from a magnetic
material such as iron, and having a cylindrical center pole 21a, a back plate 21b, and a forward
peripheral edge of the center pole 21a. A yoke 21 comprising the yoke 21c, an annular magnet
22 disposed on the front side of the back plate 21b of the yoke 21, and an annular top plate 23
disposed on the front side of the magnet 22 are configured. In the present embodiment, the
support portion 21c of the yoke 21 is integrally formed with the center pole 21a, but in another
embodiment, the support portion 21c is made of a heat-resistant material such as aluminum or
ceramic. It may be manufactured separately and fixed on the center pole 21a.
[0028]
The vibration unit 30 includes a diaphragm 31 having a substantially conical shape, an edge 32
adhesively fixed to the front end of the diaphragm 31, and a cylindrical bobbin 33 adhesively
fixed to the rear end of the diaphragm 31. A voice coil 34 wound around the outer periphery of
the bobbin 33, and a breathable center cap 36 for capping the central portion of the diaphragm
31, etc. are configured, and no tamper member is provided. There is. Therefore, it is preferable to
use an edge 32 having a high function to generate an elastic restoring force necessary for the
amplitude of the diaphragm 31.
[0029]
Further, as shown in FIG. 1 (b), the support portion 21c provided on the yoke 21 has an annular
first recess 21d, a second recess 21e, and a third recess 21f on the surface facing the bobbin 33.
Is formed.
[0030]
In the gap between the second recess 21 e and the bobbin 33, the heat resistance low viscosity
fluid 51 such as oil that can resist frictional heat with low viscosity (0.1 to 1 Pa · s) and small
friction resistance when the bobbin 33 operates Is to be filled.
Each of the gaps between the first recess 21 d and the third recess 21 f and the bobbin 33 has
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high viscosity (10 to 80 Pa · s) for preventing leakage of the heat-resistant low-viscosity fluid 51
and withstands frictional heat. A heat resistant high viscosity fluid 52 such as silicone grease is to
be filled. The heat resistant low viscosity fluid 51 and the heat resistant high viscosity fluid 52
constitute a viscous fluid 50. The filling amounts and types of the heat-resistant low-viscosity
fluid 51 and the heat-resistant high-viscosity fluid 52 are appropriately set and selected in
accordance with the characteristics, the size, and the like of the speaker 10.
[0031]
Further, the width a of the first concave portion 21 d and the third concave portion 21 f with
respect to the movable direction is determined by the heat-resistant high-viscosity fluid 52 filled
in consideration of the displacement amount of the bobbin 33. The heat-resistant, low-viscosity
fluid 51 filled in the gap is designed so as not to leak to the outside of the first recess 21 d and
the third recess 21 f. Further, the clearance b between the bobbin 33 and the second recess 21 e
and the width c of the second recess 21 e in the movable direction are designed to be values at
which the frictional resistance due to the movement of the bobbin 33 is reduced.
[0032]
According to such a speaker 10, the front end of the vibrating portion 30 is supported by the
frame 40 via the edge 32, and the bobbin 33 supports the support portion 21c via the viscous
fluid at the rear end of the vibrating portion 30. It is supposed to be supported by Therefore, the
vibrating portion 30 can be driven in the movable direction with small friction resistance with
the support portion 21c, and the bobbin 33 is supported by the support portion 21c via the
viscous fluid. Therefore, the distance between the voice coil 34 disposed in the magnetic gap G
and the top plate 23 is kept constant, and the vibration propagating from the bobbin 33 to the
frame 40 is significantly reduced.
[0033]
According to the speaker 10 according to the above-described embodiment (1), since the bobbin
33 is supported via the viscous fluid 50 filled in the gap with the support portion 21c provided in
the magnetic circuit portion 20, A state in which the vibration unit 30 can be driven in the
movable direction without using the damper 35 (see FIG. 10) for holding the other end (the
bobbin 33) of the vibration unit 30 at the center position as in the speaker 100 Can be held at a
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central position, and vibration propagation to the frame 40 can be reduced. Therefore, the
vibration transmitted to the housing (not shown) in which the speaker 10 is installed can be
reduced, and the leakage of sound transmitted from the housing to the outside can be reduced. In
addition, since the vibration transmitted to the casing can be reduced, the required performance
of the casing support (not shown) such as the speaker stand can be alleviated, and the material
cost and weight reduction of the casing support can be achieved. It becomes possible. Further,
when the damper 35 is used as in the conventional speaker 100, the damper 35 may be
damaged due to repeated fatigue caused by the amplitude operation of the vibrating portion 30,
but the bobbin 33 may be broken through the viscous fluid 50. Since it is supported, the
durability of the speaker 10 can also be improved.
[0034]
FIG. 2 is a view schematically showing the structure of the loudspeaker according to the
embodiment (2), wherein (a) is a side sectional view and (b) is a portion seen from the line B-B in
(a). It is a top view. FIG. 3 is a partial enlarged cross-sectional view around the bobbin of the
speaker in FIG. However, components having the same functions as those of the speaker 10
shown in FIG.
[0035]
In the speaker 10A according to the embodiment (2), the vibrating portion 30A is supported at a
plurality of places via the viscous fluid 50. Hereinafter, the difference from the speaker 10 shown
in FIG. 1 will be described. Only to explain.
[0036]
The yoke 21 of the magnetic circuit portion 20A includes a cylindrical center pole 21a, a back
plate 21b, a cylindrical support portion 21c extending forward from a front side peripheral
portion of the center pole 21a, and a center pole 21a. A substantially cylindrical supporting
portion 21g is provided, which extends forward from a substantially central portion of the front.
[0037]
The vibrating portion 30A includes a diaphragm 31 having a substantially truncated cone shape,
an edge 32 adhesively fixed to the front end of the diaphragm 31, and a cylindrical bobbin 33
adhesively fixed to the rear end of the diaphragm 31. A voice coil 34 wound around the outer
circumference 33, an air-permeable center cap 36 for capping the central portion of the
diaphragm 31, and an auxiliary vibration unit 37 adhesively fixed to the front end of the bobbin
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33 It is comprised including and it becomes a structure which does not provide a tamper
member.
[0038]
The auxiliary vibration portion 37 has a disc portion 37a having a disc shape whose peripheral
edge portion is adhered and fixed to one end of the front side of the bobbin 33, and a cylindrical
shape provided on the rear side from a substantially central portion of the disc portion 37a. And
a cylindrical portion 37b.
The disc portion 37a has a mesh structure for removing air when the diaphragm 31 is movable,
and the cylindrical portion 37b is disposed with a gap from the support portion 21g.
The auxiliary vibration portion 37 is formed of a material which is lightweight, heat resistant, and
hardly deformed, such as aluminum.
[0039]
Further, as shown in FIG. 3, in the supporting portion 21c, a first concave portion 21d, a second
concave portion 21e, and a third concave portion 21f having an annular shape are formed on the
surface facing the bobbin 33. .
Similarly, in the supporting portion 21g, a first concave portion 21d, a second concave portion
21e, and a third concave portion 21f having an annular shape are formed on the surface facing
the cylindrical portion 37b.
[0040]
The heat-resistant low-viscosity fluid 50 such as oil is filled in the gap between the second recess
21e and the bobbin 33, and the cylinder 37b, and the first recess 21d and the third recess 21f,
the bobbin 33, and the cylinder 37b The heat-resistant, high-viscosity fluid 52 such as grease is
filled in each of the gaps.
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[0041]
According to such a speaker 10, the front end of the vibrating portion 30 is supported by the
frame 40 via the edge 32, and the bobbin 33 is supported by the viscous fluid 50 at the rear end
of the vibrating portion 30. The cylindrical portion 37 b of the auxiliary vibration portion 37 is
supported by the support portion 21 g via the viscous fluid 50.
Therefore, the vibration unit 30 is supported so that it can be driven in the movable direction
with small frictional resistance, and the bobbin 33 and the cylindrical portion 37b are supported
by the support portions 21c and 21g via viscous fluid. Thus, the effect of reducing the lateral
displacement of the vibrating portion 30 is enhanced, and the distance accuracy between the
voice coil 34 disposed in the magnetic gap G and the top plate 23 is further enhanced.
[0042]
According to the speaker 10A according to the above-mentioned embodiment (2), the other end
portion (bobbin 33) of the vibrating portion 30 and the cylindrical portion 37b of the auxiliary
vibrating portion 37 are respectively filled in the gaps with the support portions 21c and 21g.
Since it is supported via the viscous fluid 50, substantially the same effect as the speaker 10
according to the above-described embodiment (1) can be obtained, and the load applied to the
vibration unit 30 by supporting the fluid at a plurality of locations. Can be dispersed, and the
effect of reducing the lateral displacement of the vibrating portion 30 can be enhanced. Further,
the strength of the vibrating portion 30 (particularly, the bobbin 33) can be reinforced by the
auxiliary vibrating portion 37, and the durability can be further improved.
[0043]
In the speaker 10A according to the embodiment (2), the bobbin 33 of the vibrating portion 30
and the cylindrical portion 37b of the auxiliary vibrating portion 37 support the fluid via the
viscous fluid 50, as a configuration in which the fluid is supported at a plurality of places. , 21g,
but in another embodiment, a cylindrical support portion 21h is extended at the front
approximately central portion of the center pole 21a in the configuration shown in FIG. The
cylindrical portion 37c having an outer diameter smaller than the inner diameter of the support
portion 21h is provided substantially at the center of the auxiliary vibration portion 37A, and the
gap between the inner circumferential surface of the support portion 21h and the outer
circumferential surface of the cylindrical portion 37c is filled with the viscous fluid 50. It may be
configured to
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[0044]
In still another embodiment, when the through hole 24 for air removal is formed in the
configuration shown in FIG. 5, that is, the center pole 21a, the bobbin 33 of the vibrating portion
30C is supported via the viscous fluid 50. The cylindrical portion 37d having an outer diameter
smaller than the inner diameter of the through hole 24 is provided substantially at the center of
the auxiliary vibration portion 37B without using the supporting portion 21c. The viscous fluid
50 may be filled in the gap between the inner circumferential surface and the outer
circumferential surface of the cylindrical portion 37d.
[0045]
Further, in still another embodiment, without providing the support portion 21c for supporting
the bobbin 33 of the vibration portion 30 via the viscous fluid 50, the bobbin 33 is formed by the
cylindrical portion 37b and the support portion 21g of the auxiliary vibration portion 37. A
plurality of support structures of the cylindrical portion 37 b of the auxiliary vibration portion 37
and the support portion 21 g may be provided.
[0046]
Next, a loudspeaker according to the embodiment (3) will be described.
FIG. 6 is a view schematically showing the structure of the speaker according to the embodiment
(3), in which (a) is a side sectional view, and (b) is a partially enlarged view around the bobbin of
the speaker in (a). FIG.
However, components having the same functions as those of the speaker 10 shown in FIG.
[0047]
In the speaker 10B according to the embodiment (3), the bobbin 33 is held by the support
portions 21c and 23a via the viscous fluid 50. Hereinafter, the difference from the speaker 10
shown in FIG. I will explain only.
[0048]
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The magnetic circuit unit 20B includes a yoke 21 including a cylindrical center pole 21a, a back
plate 21b, and a cylindrical support 21c extending forward from the front side peripheral edge of
the center pole 21a. And an annular top plate 23 disposed on the front side of the magnet 22.
The top plate 23 has a front side on the front side. A cylindrical support portion 23a is extended
forward from the inner diameter portion, and the support portion 21c and the support portion
23a sandwich the bobbin 33 with the viscous fluid 50 interposed therebetween.
[0049]
Further, as shown in FIG. 6B, the first recess 21 d, the second recess 21 e, and the third recess 21
f having an annular shape are formed on the surface facing the bobbin 33 in the support portion
21 c. It is done.
Similarly, in the supporting portion 23a, an annular first recess 23b, a second recess 23c, and a
third recess 23d are formed on the surface facing the bobbin 33.
[0050]
The heat-resistant low-viscosity fluid 51 such as oil is filled in the gap between the second recess
21e and the bobbin 33, and the second recess 23c and the bobbin 33, and the first recess 21d
and the third recess 21f and the bobbin 33 are A heat-resistant high-viscosity fluid 52 such as
grease is filled in the space between the first recess portion 23b and the third recess portion 23d
and the bobbin 33, respectively.
[0051]
According to such a speaker 10B, the front end of the vibration unit 30 is supported by the frame
40 via the edge 32, and the bobbin 33 is supported by the support fluid 21 through the viscous
fluid 50 at the rear end of the vibration unit 30. , And are supported in a state of being
sandwiched by the support portions 23a.
[0052]
According to the speaker 10B according to the above-described embodiment (3), the rear end
portion of the vibrating portion 30 is supported in a state where the bobbin 33 is sandwiched
between the support portion 21c and the support portion 23a via the viscous fluid 50. Therefore,
the same effect as that of the speaker 10 according to the above-described embodiment (1) can
be obtained, and lateral displacement of the vibrating unit 30 can be suppressed, and the
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positional accuracy of the vibrating unit 30 can be enhanced.
[0053]
In the speaker 10B according to the above-described embodiment (3), the bobbin 33 is supported
in a state of being sandwiched between the support portion 21c and the support portion 23a via
the viscous fluid 50, but another In the embodiment, the bobbin 33 may be supported by only
the support portion 23 a without providing the support portion 21 c.
[0054]
Next, a loudspeaker according to the embodiment (4) will be described.
FIG. 7 is a partially enlarged cross-sectional view of the vicinity of the bobbin of the speaker
according to the embodiment (4).
However, components having the same functions as those of the speaker 10 shown in FIG. 1 will
be assigned the same reference numerals and descriptions thereof will be omitted.
In the speaker 10C according to the embodiment (4), over damping of the bobbin 33 can be
prevented, and only differences from the speaker 10 shown in FIG. 1 will be described below.
[0055]
The vibrating portion 30D has a diaphragm 31 having a substantially frusto-conical shape, an
edge 32 adhesively fixed to the front end of the diaphragm 31 (see FIG. 1A), and an adhesive rear
end to the rear end of the diaphragm 31. It includes a cylindrical bobbin 33, a voice coil 34
wound around the outer periphery of the bobbin 33, and a breathable center cap 36 (see FIG. 1A)
for capping the central portion of the diaphragm 31. The bobbin 33 is equipped with an annular
projection 33a protruding toward the center pole 21a at a predetermined distance on the rear
side of the third recess 21f of the support 21c.
The protrusion 33 a is formed of a hard material such as resin, and is adhered and fixed to the
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bobbin 33.
The projection 33a and the third recess 21f constitute a displacement amount control means.
[0056]
In such a speaker 10C, when the vibrating portion 30D approaches the overdump, the projecting
portion 33a abuts on the third concave portion 21f, whereby overdamping of the vibrating
portion 30D is prevented.
[0057]
According to the speaker 10C according to the above-mentioned embodiment (4), since the
displacement amount control means (the projection 33a and the third recess 21f) for restricting
the displacement of the vibrating portion 30D in the movable direction is provided, When the
amount of displacement of the vibrating portion 30D in the movable direction increases, or when
the driving force increases, it is possible to prevent the vibrating portion 30D from being in the
over-dump state, and one end of the vibrating portion 30D. A phenomenon that the vibrating
portion 30D does not return to the original position can be eliminated by a large amplitude
greater than the durability strength of the edge 32 provided, so that the deterioration of the edge
32 can be delayed, and the durability of the speaker can be improved. it can.
Further, the displacement amount of the bobbin 33 can be adjusted by the arrangement position
of the projection 33a.
[0058]
Next, a loudspeaker according to the fifth embodiment will be described.
FIG. 8 is a partially enlarged cross-sectional view of the vicinity of the bobbin of the speaker
according to the fifth embodiment. However, components having the same functions as those of
the speaker 10 shown in FIG. 1 will be assigned the same reference numerals and descriptions
thereof will be omitted. In the speaker 10D according to the fifth embodiment, adjustment of the
filling pressure of the viscous fluid 50 filled in the gap between the bobbin 33 and the support
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portion 21c and exchange of the viscous fluid 50 can be performed. Only differences from the
speaker 10 shown in FIG. 1 will be described.
[0059]
The supporting portion 21c provided on the yoke 21 of the magnetic circuit portion 20C
includes, on the surface facing the bobbin 33, an annular first recess 21d, a second recess 21e, a
third recess 21f, and an inner circumferential surface thereof. The screw hole 25 communicating
with the second recess 21e is formed, and the screw 26 is fitted into the screw hole 25 from the
inner peripheral surface of the support portion 21c. The pressure adjustment / replacement
means is configured by including the screw hole 25 and the screw 26.
[0060]
A heat-resistant low-viscosity fluid 51 such as oil is filled in the gap between the second recess
21 e and the bobbin 33 and the screw hole 25, and the gap between the first recess 21 d and the
third recess 21 f and the bobbin 33 is filled. Is made to be filled with a heat resistant high
viscosity fluid 52 such as grease.
[0061]
Therefore, by adjusting the degree of tightening of the screw 26 provided in the support portion
21c using a tool or the like, it is possible to adjust the filling pressure of the heat-resistant lowviscosity fluid 51 which has changed due to evaporation, wear or the like.
Further, by completely removing the screw 26, the heat-resistant low-viscosity fluid 51 can be
replaced. Note that the filling pressure of the heat-resistant high-viscosity fluid 52 may be
adjusted, replaced, or refilled by the same configuration.
[0062]
According to the speaker 10D according to the above-mentioned embodiment (5), since the
support portion 21c is provided with the pressure adjustment / replacement means, the
adjustment of the filling pressure of the viscous fluid and / or the exchange of the viscous fluid
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are performed. Thus, the stiffness of the vibration unit 30 can be adjusted, and the low resonance
frequency f0 and the sound pressure level can be appropriately changed. Further, since the
pressure adjustment / replacement means is constituted by the screw hole 25 and the screw 26,
adjustment and replacement of the filling pressure of the viscous fluid can be performed by a
manual operation with a simple and low-cost mechanism.
[0063]
In the speaker 10D according to the fifth embodiment, the pressure adjustment / replacement
means is constituted by a mechanical mechanism that can be manually operated, but in another
embodiment, as shown in FIG. The pressure adjustment / replacement means may be configured
by including the shaft 27, the gear mechanism 28, the driver (small motor etc.) 29, a drive switch
(not shown) provided in the housing, and the like. According to such a configuration, the
pressure adjustment / replacement means is configured to include an electrically driven
mechanism, so it is easy to adjust the filling pressure of the viscous fluid 50 from the outside
without disassembling the speaker. It can be done with high accuracy.
[0064]
BRIEF DESCRIPTION OF THE DRAWINGS It is the figure which showed typically the structure of
the speaker which concerns on embodiment (1) of this invention, (a) is side surface sectional
drawing, (b) is the partial expanded sectional view around a bobbin in (a). It is the figure which
showed typically the structure of the speaker based on Embodiment (2), (a) is side surface
sectional drawing, (b) is the fragmentary top view seen from the BB line in (a). FIG. 3 is a partial
enlarged cross-sectional view around a bobbin of the speaker shown in FIG. 2; It is the elements
on larger scale sectional view of the bobbin circumference of the speaker concerning another
embodiment. It is the elements on larger scale sectional view of the bobbin circumference of the
speaker concerning another embodiment. It is the figure which showed typically the structure of
the speaker based on Embodiment (3), (a) is side surface sectional drawing, (b) is the elements on
larger scale sectional view of the bobbin periphery in (a). It is a partial expanded sectional view
around a bobbin of a speaker concerning embodiment (4). It is a partial expanded sectional view
around a bobbin of a speaker concerning embodiment (5). It is the elements on larger scale
sectional view of the bobbin circumference of the speaker concerning another embodiment. It is
side surface sectional drawing which showed the structure of the conventional speaker typically.
Explanation of sign
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[0065]
10, 10A, 10B, 10C, 10D Speaker 20 20A, 20B, 20C Magnetic circuit unit 21c, 21g, 21h, 23a
Support unit 30, 30A, 30B, 30C, 30D Vibration unit 40 Frame 50 Viscous fluid
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