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DESCRIPTION JP2001025089

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DESCRIPTION JP2001025089
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker used in various acoustic devices.
[0002]
2. Description of the Related Art A conventional speaker will be described with reference to a half
sectional view of FIG.
[0003]
In the figure, reference numeral 6 is a magnetic circuit constituted by a lower plate 7 having a
center pole, a ring-shaped magnet 8 and a ring-shaped upper plate 9, and a frame 10 is coupled
to the upper surface of the magnetic circuit 6. It is done.
Also, 11 is a voice coil, and the inner peripheral edge of the suspension 13 is coupled to the voice
coil 11 so that the lower portion fits into the magnetic gap 12 of the magnetic circuit 6 without
eccentricity, and the outer periphery is coupled to the frame 10 The voice coil 11 is supported by
the suspension 13.
[0004]
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1
An outer peripheral portion of the diaphragm 2 is connected to the edge 1a, and an outer
peripheral portion of the edge 1a is connected to the frame 10 together with the gasket 14, and
an inner peripheral portion of the diaphragm 2 is connected to the voice coil. Bonded to the top
of 11.
[0005]
Denoted at 15 is a bowl-shaped dust cap joined to the central upper surface of the diaphragm 2,
and 16 are lead wires at both ends of the voice coil 11, each of which is crimped on the surface
of the diaphragm 2. The eyelet 17 solders each tinsel wire 18 and the other end of the tinsel wire
18 is soldered and connected to the terminal 19a of the connector 19 fixed to the frame 10.
[0006]
The lead wire 16 is bonded to the diaphragm 2 with an adhesive applied.
[0007]
In addition, the bonding described above is most commonly performed by using an adhesive.
[0008]
The operation of the conventional speaker configured as described above will be described
below.
[0009]
First, when an input signal is applied to the voice coil 11 from the connector 19 through the
terminal 20 and the tinsel wire 18, the voice coil 11 is driven according to Fleming's left-hand
rule, and the diaphragm 2 is driven by this driving force. It vibrates and emits sound into the air.
[0010]
FIG. 17 is a half sectional view of another conventional speaker, and the difference from the
conventional speaker of FIG. 16 is that a flat metal plate in which the dust cap 15a is joined on
the diaphragm 2 and on the edge 1a. And the other parts are the same as those of the resin
molded plate, so that the description will be omitted.
[0011]
However, in the above-described conventional configuration, in the case of a type of loudspeaker
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2
in which the input signal applied to the loudspeaker is large, the coupling surface between the
diaphragm and the edge is enlarged to increase the coupling strength. Although this method is
used, when the speaker is driven, this coupling portion serves as the point of action of the
bending action, resulting in the occurrence of strength deterioration.
[0012]
Particularly when the diaphragm is a hard material (for example, made of metal), the compliance
is largely different at the junction of the outermost periphery and the edge of the diaphragm, so
when the input signal becomes large and the amplitude of the diaphragm becomes large, The
joint portion has a problem that the action point of the bending action becomes, and the edge
with a large compliance is easily broken from the action point.
[0013]
The present invention is intended to solve the above-mentioned problems, and it is an object of
the present invention to provide a speaker having improved reliability with respect to a large
input.
[0014]
SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the
loudspeaker according to the present invention mainly comprises a frame coupled to a magnetic
circuit forming a magnetic gap, and a voice coil fitted in the magnetic gap. A diaphragm in which
an outer peripheral portion is bonded to an edge and an outer peripheral portion is connected to
an edge of the frame and an annular rib is provided on an outer periphery of a bonding surface
with the diaphragm; It is composed of an elastic adhesive filled in the annular rib, and the elastic
adhesive filled in the annular rib increases the internal loss in the annular rib, thereby acting as a
bending action. Even if the input signal of the speaker is increased and the amplitude of the
diaphragm is increased by dispersing the points, breakage of the edge is less likely to occur, and
the reliability for the large input is improved. And it makes it possible to test.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION According to the first aspect of the present
invention, a frame coupled to a magnetic circuit having a magnetic gap formed therein, and a
voice coil coupled to the magnetic gap as a central coupling A diaphragm having a portion
bonded and connected to an edge, an edge having an outer peripheral portion coupled to the
periphery of the frame and a concave annular rib provided on the outer periphery of a bonding
surface with the diaphragm; And an adhesive having elasticity filled therein, and since the
concave annular rib and the elastic adhesive are filled in the annular rib, the internal loss in the
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3
annular rib is increased, and the action of the bending action is performed. Even if the input
signal of the speaker is increased and the amplitude of the diaphragm is increased by dispersing
the points, breakage of the edge is less likely to occur, and it is possible to provide a speaker with
improved reliability for a large input. It is intended.
[0016]
According to a second aspect of the present invention, the outer shape of the diaphragm of the
first aspect is enlarged so as to cover and seal the concave annular rib filled with the adhesive. In
addition to the effects, the diaphragm can be enlarged to provide a speaker with improved bass
reproduction capability.
[0017]
According to a third aspect of the present invention, the outer peripheral portion of the
diaphragm of the first aspect is provided with a bent portion, and in addition to the same effect
as the first aspect, the outer peripheral portion of the diaphragm By reinforcing the mechanical
strength of the outer peripheral part by bending, the reproduction frequency is expanded, and
deformation of the nozzle of the coating device for adhesive application for filling the annular rib
is also prevented, and the arrangement of the nozzles The setting becomes easy, the efficiency of
the adhesive filling process can be improved, and an inexpensive speaker can be provided.
[0018]
According to a fourth aspect of the present invention, a bent portion is provided on the outer
periphery of the dust cap coupled to the diaphragm in the vicinity of the concave annular rib of
the first aspect so as to cover the voice coil. In addition to the effects and effects of claim 1, it is
possible to place a nozzle for applying an adhesive on the outer peripheral portion of the dust
cap to fill the adhesive, and the application of the adhesive for filling the annular rib is performed
at high speed. The efficiency of the adhesive filling process can be improved, and an inexpensive
speaker can be provided, and the bending of the outer peripheral part also improves the
mechanical strength of the outer peripheral part of the dust cap, thereby reinforcing the
mechanical strength. It is possible to provide a speaker whose reproduction frequency is
expanded by the above.
[0019]
The invention according to claim 5 of the present invention is that the outer periphery of the
bent portion of the dust cap according to claim 4 is provided with a fold, and the mechanical
strength of the outer periphery of the dust cap is further increased. It is possible to provide a
speaker that is improved and the reproduction frequency is further expanded.
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4
[0020]
According to a sixth aspect of the present invention, the dust cap according to the fourth or fifth
aspect is fitted into and coupled to a voice coil, and further, the centering accuracy at the time of
incorporation of the dust cap and The bonding strength is improved.
[0021]
The invention according to claim 7 of the present invention is the dust cap according to claim 4
or claim 5 or claim 6 provided with a convex-concave bent portion in the middle part, and this
bent portion As a result, the mechanical strength of the entire dust cap is also improved, and the
reinforcement of the mechanical strength makes it possible to provide a speaker whose
reproduction frequency is further expanded.
[0022]
Embodiments of the present invention will be described below with reference to FIGS. 1 to 15.
[0023]
The same parts as those in the prior art are given the same reference numerals and their
explanations are omitted, and only the differences will be explained.
[0024]
(Embodiment 1) FIG. 1 is a half sectional view of an embodiment of a loudspeaker according to
the present invention, and FIG. 2 is a perspective view of an essential part of a joint part of an
edge and a diaphragm which is the essential part. is there.
[0025]
According to the figure, 1b is an annular rib having a U-shaped cross section provided on the
outer peripheral surface of the joint portion of the diaphragm 2 and the edge 1a, and 3 is a cured
after filling the annular rib 1b. Is also a flexible adhesive such as rubber.
[0026]
With the above configuration, the internal loss is increased by the adhesive 3 in the annular rib
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1b, the point of action of the bending action is dispersed, the input signal of the speaker is
increased, and the amplitude of the diaphragm is increased. Also, the breakage of the edge 1a
does not easily occur, and a speaker having improved reliability with respect to a large input can
be obtained.
In addition, the internal loss imparting action of the adhesive 3 suppresses the resonance at the
bonding surface of the diaphragm 2 and the edge 1a, and has an effect that flat frequency
characteristics can be obtained.
[0027]
Although the shape of the annular rib 1b has been described as a U-shape in the above
embodiment, it may be appropriately set according to the form in which the adhesive 3 can be
filled, and the annular rib 1b is Depending on the size of the connecting portion between the
edge 1 a and the diaphragm 2, a plurality of them may be provided concentrically, and the same
applies to the following embodiments.
Moreover, although the shape of the roll part 1c of the edge 1a is illustrated as a down roll shape
in the said embodiment, another shapes, such as an up roll and a waveform, may be sufficient.
[0028]
(Embodiment 2) FIG. 3 is a perspective view of an edge of an essential part of another
embodiment of the present invention and an essential part of a joint component of a diaphragm,
and FIG. 4 is a half sectional view of the same speaker. is there.
[0029]
The outer periphery of the diaphragm 2 is made larger than the position of the annular rib 1b of
the roll portion 1c of the edge 1a, and the adhesive filled with the diaphragm 2 has flexibility
even after curing. A sealed space 4 filled with 3 is provided.
[0030]
As constructed above, the diaphragm 2 is enlarged to have the effect of improving the ability to
reproduce the bass.
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[0031]
(Embodiment 3) FIG. 5 is a perspective view of an edge of an essential part of another
embodiment of the present invention and an essential part of a joint component of a diaphragm,
and FIG. 6 is a half sectional view of the same speaker. FIG. 7 is a schematic view of the adhesive
application process.
[0032]
Reference numeral 2 a denotes a bent portion of the outer periphery of the diaphragm 2.
The adhesive 3 can be filled by bringing the nozzle 5 b of the adhesive application device 5 a into
contact with the bent portion 2 a of the outer periphery of the diaphragm 2.
[0033]
With the above construction, the adhesive 3 filling the annular rib 1b can be applied at a high
speed, and an inexpensive combination part of the edge 1a and the diaphragm 2 can be
efficiently obtained.
[0034]
In the above embodiment, the shape of the bent portion 2a on the outer periphery of the
diaphragm 2 is straight, but the shape of the nozzle 5b of the adhesive application device 5a and
the bent portion 2a on the outer periphery of the diaphragm 2 are It may be set appropriately in
accordance with the required strength.
[0035]
(Fourth Embodiment) FIG. 8 is a half sectional view of an embodiment of the present invention,
and FIG. 9 is a perspective view of the main part of the joint part of the dust cap, the edge and
the diaphragm which is the main part. It is.
[0036]
According to the drawing, 1b has a U-shaped cross section provided on the outer peripheral
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surface of the edge 1a of the connection portion of the flat dust cap 15b having the bent portion
20 whose outer periphery is bent, the diaphragm 2 and the edge 1a. The annular rib 3 is in the
form of an annular rib, and 3 is an adhesive such as a rubber-based adhesive having flexibility
even after being filled in the annular rib 1b.
The dust cap 15 b corresponds to the dust cap 15 a of the prior art, and the difference is that it
has a bent portion 20.
[0037]
With the above construction, as in the first embodiment, the internal loss is increased by the
adhesive 3 in the annular rib 1b, the action point of the bending action is dispersed, and the
input signal of the speaker is increased to cause vibration. Even if the amplitude of the plate 2 is
increased, breakage of the edge 1a is less likely to occur, and a speaker having improved
reliability for large input can be obtained.
[0038]
Further, the bent portion 20 of the dust cap 15b makes it possible to place the nozzle for
applying the adhesive on the bent portion 20 of the dust cap 15b to be filled with the adhesive 3,
thereby filling the annular rib 1b. The adhesive 3 can be applied at a high speed, and an
inexpensive combination of the edge 1a, the dust cap 15b and the diaphragm 2 can be obtained,
and the bending portion 20 also improves the mechanical strength of the outer peripheral
portion of the dust cap 15b. It is
[0039]
Although the bent portion 20 of the dust cap 15b is straight in the above embodiment, it may be
appropriately set according to the shape of the nozzle for applying the adhesive and the
necessary strength of the outer periphery of the dust cap 15b. It is.
[0040]
Further, the internal loss imparting action of the adhesive 3 suppresses the resonance at the
bonding surface of the dust cap 15b and the edge 1a and the diaphragm 2 to obtain flat
frequency characteristics.
[0041]
The above embodiment described above has the same effect as the third embodiment as
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8
understood from the above description, but the bent portion 20 is provided on the dust cap 15b.
Therefore, when the guide for the adhesive application nozzle (for example, the nozzle 5b of FIG.
7) is used, the dust cap 15b is more than when the bent portion 2a of the diaphragm 2 is used as
a guide as in the third embodiment. Since the metal plate or resin molded plate has sufficient
strength, the speed of the filling operation can be improved.
[0042]
(Fifth Embodiment) FIG. 10 is a perspective view of the main part of the dust cap of the main part
of another embodiment of the present invention, and FIG. 11 is a half sectional view of the same
speaker.
[0043]
Denoted at 15c is a dust cap which has an outer peripheral portion 20a which is bent and folded
at its outer periphery.
[0044]
With the above construction, the mechanical strength of the outer peripheral portion of the dust
cap 15c is further improved.
[0045]
In the above embodiment, the shape of the outer peripheral portion 20a of the dust cap 15c is a
straight line, but it may be appropriately set according to the nozzle shape for applying the
adhesive and the necessary strength of the outer peripheral portion 20a of the dust cap 15c. It is
good.
[0046]
(Embodiment 6) FIG. 12 is a perspective view of the main part of the dust cap of the main part of
another embodiment of the present invention, and FIG. 13 is a half sectional view of the same
speaker.
[0047]
In the dust cap 15c of the fifth embodiment, a cylindrical recess 21 is provided which is fitted
and joined to the ring shape of the voice coil 11.
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[0048]
With the above configuration, the centering accuracy and the coupling strength can be improved
when the dust cap 15d is incorporated into the speaker.
[0049]
Although the fitting and joining of the dust cap 15d and the voice coil 11 in this embodiment is
on the inside of the ring of the voice coil 11, it may be on the outside or on the top, and it may be
appropriately set according to the form of the speaker. It is good.
[0050]
(Seventh Embodiment) FIG. 14 is a perspective view of the main part of the dust cap of the main
part of another embodiment of the present invention, and FIG. 15 is a half sectional view of the
same speaker.
[0051]
The reference numeral 15e denotes a bending portion 22 having a concavo-convex shape in the
middle between the joint portion (cylindrical recess 21) of the dust cap 15d of the sixth
embodiment with the voice coil 11 and the joint portion of the edge 1a and the diaphragm 2. Is a
dust cap provided with
[0052]
The mechanical strength of the entire dust cap 15e is also improved by the bent portion 22, and
the reinforcing function of the mechanical strength makes it possible to provide a speaker whose
reproduction frequency is further expanded.
[0053]
In the above embodiment, the bending portion 22 is described as being provided between the
joint portion of the cylindrical recess 21 and the edge 1a, but in the middle portion of the dust
cap 15e having no cylindrical recess 21. Even if it is provided, it is possible to provide a speaker
whose mechanical strength is improved and the reproduction frequency is expanded.
[0054]
Further, although the bent portion 22 of the dust cap 15e in the present embodiment has a
concavo-convex shape, it may be a wave shape, a wedge shape or the like, and appropriately set
according to the form of the speaker and the clearance with the diaphragm 2. It is good.
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[0055]
If a high thermal conductivity such as a metal plate is used as the dust cap in the fourth to sixth
embodiments, the temperature rise of the voice coil 11 can be suppressed by the heat radiation
effect, and the input resistance can be improved. Particularly in the case where the dust caps 15d
and 15e are inserted into the voice coil 11 as in the fifth and sixth embodiments, the heat
resistance effect can be further improved by the heat radiation effect.
[0056]
As described above, according to the speaker of the present invention, by filling the adhesive in
the annular rib, the point of action of the bending action is dispersed by increasing the internal
loss in the annular rib, Even if the input signal of the speaker becomes large and the amplitude of
the diaphragm becomes large, breakage of the edge hardly occurs, and a speaker having
improved reliability with respect to large input can be obtained.
[0057]
Brief description of the drawings
[0058]
1 is a half sectional view of an embodiment of the speaker of the present invention
[0059]
Fig. 2 A perspective view of the main part of the joint part of the edge and the diaphragm which
is the same main part
[0060]
3 is a perspective view of the main part of the other embodiment and the main part of the joining
part of the diaphragm
[0061]
Fig. 4 Half sectional view of the same speaker
[0062]
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11
5 is a perspective view of the main part edge of the other embodiment and the main part of the
joining part of the diaphragm
[0063]
Fig. 6 Half sectional view of the same speaker
[0064]
Fig. 7 A schematic view of the adhesive application process of the edge of the main part and the
diaphragm
[0065]
8 is a half sectional view of another embodiment of the speaker of the present invention
[0066]
Fig. 9 A perspective view of the main part of the joint part of the dust cap and the edge and the
diaphragm which is the same main part.
[0067]
10 is a perspective view of the main part of the dust cap of the main part of the same other
embodiment
[0068]
Fig. 11 Half sectional view of the same speaker
[0069]
12 is a perspective view of the main part of the dust cap of the main part of the same other
embodiment
[0070]
Fig. 13 Half sectional view of the same speaker
[0071]
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12
14 is a perspective view of the main part of the dust cap of the main part of the same other
embodiment
[0072]
Fig.15 Half sectional view of the same speaker
[0073]
Fig. 16 Half sectional view of the conventional speaker
[0074]
Fig. 17 Half sectional view of another conventional speaker
[0075]
Explanation of sign
[0076]
DESCRIPTION OF SYMBOLS 1a Edge 1b Annular rib 2 Diaphragm 3 Adhesive 4 Sealed space 5b
Nozzle 6 Magnetic circuit 10 Frame 11 Voice coil 12 Magnetic gap 15b, 15c, 15d, 15e Dust cap
20, 22 Folded part 20a Outer peripheral part 21 Concave part
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