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JP2008109288

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2008109288
An object of the present invention is to provide a "speaker" suitable for thinning which can
secure good acoustic performance in the middle to high range and the low range. A speaker (30)
holds and fixes a damper (38) between yokes (41, 42) located radially outward of magnetic gaps
(G1, G2). The inner periphery of the damper (38) elastically supports a bobbin (32). At the same
time, the diaphragm 35 is elastically supported at the outer peripheral portion of the damper 38.
[Selected figure] Figure 1
スピーカ
[0001]
The present invention relates to an electrodynamic speaker, and more particularly to a speaker in
which a tapered diaphragm is disposed to surround a bobbin on which a voice coil is wound.
[0002]
Conventionally, the diaphragm is arranged around the bobbin by fixing the base end of the
bobbin to the small-diameter inner peripheral edge with the large diameter side of the tapered
diaphragm facing the magnetic circuit side, and so on. Thus, there is known a speaker whose
thickness is reduced by suppressing the overall height dimension.
In this type of speaker, a damper that elastically supports a vibration system is adhesively fixed
to a bobbin (for example, see Patent Document 1), and a damper is adhesively fixed to an outer
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peripheral portion of a diaphragm (for example, Patent Document 2) See).
[0003]
FIG. 7 is a cross-sectional view of a speaker showing the former example of the prior art
disclosed in Patent Document 1. This speaker 1 is wound around a magnetic circuit 2 having a
magnetic gap G and a tip portion of a bobbin 3 A voice coil 4 disposed in G, a diaphragm 5 made
of tapered cone paper and the like, and an inner peripheral edge portion is adhesively fixed to a
base end portion (upper end portion in the drawing) of the bobbin 3 The lower frame 7 and the
upper frame 8 integrally supported on the outer peripheral edge of the diaphragm 5 via the edge
6 and the outer peripheral edge are held and fixed to the upper frame 8 so that the inner
peripheral edge is a bobbin A damper 9 is adhesively fixed to the base end portion 3, a dustproof
cap 10 mounted on a bobbin 3 and a dustproof screen 11 covering an opening 7 a of the lower
frame 7. The magnetic circuit 2 is constituted by the magnet 12 and the yokes 13 and 14, and a
magnetic gap G is formed between the yokes 13 and 14.
[0004]
The speaker 1 configured in this manner is arranged such that the diaphragm 5 surrounds the
bobbin 3 by directing the large diameter side of the tapered diaphragm 5 toward the magnetic
circuit 2 side. Thinning with a reduced height dimension has been realized. The damper 9 of the
speaker 1 is disposed so as to cover the opening 8 a of the upper frame 8, and elastically
supports the base end of the bobbin 3 and the inner peripheral edge of the diaphragm 5.
[0005]
On the other hand, FIG. 8 is a cross-sectional view of a speaker showing the latter conventional
example disclosed in Patent Document 2, and parts corresponding to FIG. 7 are given the same
reference numerals. In the loudspeaker 20 shown in FIG. 8, an annular spacer 16 is attached on
the inner wall 15 a of the frame 15 on which the magnetic circuit 2 is installed, and the outer
peripheral edge of a pair of dampers 17 and 18 held and fixed to the annular spacer 16. Is
adhesively fixed to the outer peripheral edge of the diaphragm 5. By thus supporting the outer
peripheral edge of the diaphragm 5 with the plurality of dampers 17 and 18 to increase the
restraint force on the vibration system, undesired rolling phenomenon is caused even if the
bobbin 3 is not directly supported by the dampers. It can be suppressed.
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[0006]
The magnetic circuit 2 of the speaker 20 is constituted by a substantially cylindrical laminated
body in which the magnet 21 is interposed between the lower yoke 22 and the upper yoke 23,
and an annular yoke 24 surrounding the laminated body. There is. A magnetic gap G1 is formed
between the lower yoke 22 and the annular yoke 24, and a magnetic gap G2 is formed between
the upper yoke 23 and the annular yoke 24. The voice coils 25 and 26 wound around the bobbin
3 are arranged. That is, although the magnetic circuit 2 of the speaker 1 shown in FIG. 7 has a 1
gap structure, the magnetic circuit 2 of the speaker 20 shown in FIG. 8 has a 2 gap structure. JPA-8-237794 (page 3-4, FIG. 4) JP-A-2006-41676 (page 4-7, FIG. 1)
[0007]
By the way, in the prior art example of the former shown in FIG. 7, the front direction of the
speaker 1 can be used regardless of whether it is above or below. However, when the front
direction of the speaker 1 is above, damper 9 and the upper frame 8 easily become acoustic
obstacles, and when the front direction is the lower side in the figure, the magnetic circuit 2 and
the dustproof screen 11 easily become acoustic obstacles. Therefore, such a conventional
speaker 1 is likely to cause disturbance of the frequency characteristic and deterioration of the
directivity in the middle to high frequency range, and there is a problem that good acoustic
performance can not be expected. In addition, if the dustproof screen 11 is removed from the
speaker 1, foreign matter intrudes from the outside into the magnetic gap G to easily cause an
operation failure.
[0008]
On the other hand, in the case of the latter conventional example shown in FIG. 8, when the front
direction of the speaker 20 is used as the upper side in the figure, no acoustic obstacle exists in
front of the diaphragm 5, so that the acoustic performance in the middle to high range does not
deteriorate However, in order to suppress the rolling phenomenon of the bobbin 3 and the like, it
is necessary to increase the restraining force on the vibration system by using a plurality of
dampers 17 and 18, etc., another problem that a sufficient amount of amplitude can not be
secured in the vibration system. was there. That is, since the damper mechanism of the speaker
20 elastically supports the outer peripheral edge portion of the diaphragm 5 which is largely
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separated from the bobbin 3, the bobbin 3 rolls and noises at high input when the restraint force
on the vibration system is weak. There is a risk that it may be released or cause a break in the
voice coil 4. Therefore, in such a conventional speaker 20, it is necessary to adopt a damper
mechanism in which the restraining force with respect to the vibration system is enhanced, and
as a result, the amount of amplitude of the vibration system is suppressed. It will be gone.
[0009]
The present invention has been made in view of the circumstances of the prior art as described
above, and an object thereof is to provide a speaker suitable for thinning which can ensure good
acoustic performance in the middle to high range and the low range.
[0010]
According to the present invention, the damper is held and fixed to the yoke located radially
outward of the magnetic gap, and the bobbin and the diaphragm are elastically supported by the
damper.
At this time, the inner periphery of one damper may elastically support the bobbin and the outer
periphery may elastically support the diaphragm, or the damper may be elastically supported by
the damper provided on the radially inner side of the yoke. Alternatively, the diaphragm may be
elastically supported by another damper provided radially outward of the yoke.
[0011]
According to the speaker of the present invention, since the bobbin and the diaphragm are both
elastically supported by the damper, the rolling phenomenon of the bobbin is suppressed even at
high input, and a sufficient amplitude amount can be secured in the vibration system. Therefore,
good acoustic performance can be ensured in the low frequency range. In addition, since the
speaker can be configured such that the diaphragm is largely exposed in the front direction and
no acoustic obstacle exists in the front, good acoustic performance can be ensured even in the
middle to high range. And since this diaphragm has a tapered diaphragm arranged so as to
surround the bobbin, it is suitable for thinning.
[0012]
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According to the present invention, a bobbin on which a voice coil is wound, a magnetic circuit
having a magnetic gap in which the voice coil is disposed, and a tapered outer side of the bobbin
are disposed in the radial direction of the bobbin. A speaker comprising: a diaphragm supporting
an end; and a frame integrated with the magnetic circuit to support an outer peripheral edge of
the diaphragm, wherein the diaphragm is driven by energizing the voice coil, A damper is held
and fixed to a yoke located radially outward of the magnetic gap in the magnetic circuit, and an
inner peripheral edge portion of a portion of the damper extending radially inward from the yoke
is fixed to the bobbin. A portion of the damper extending radially outward from the yoke is fixed
to the diaphragm.
[0013]
In the speaker configured as described above, since the bobbin and the diaphragm are both
elastically supported by the damper, the rolling phenomenon of the bobbin is suppressed even at
high input, and a sufficient amount of amplitude can be secured in the vibration system.
Therefore, good acoustic performance can be ensured in the low frequency range.
In addition, since the speaker can be configured such that the diaphragm is largely exposed in
the front direction and no acoustic obstacle exists in the front, good acoustic performance can be
ensured even in the middle to high range.
[0014]
In the above configuration, the damper fixed to the diaphragm is extended outward in the radial
direction of the diaphragm and fixed to the frame so that the diaphragm is supported by the
frame via the extension part of the damper. In such a case, it is possible to omit the edge portion
interposed between the frame and the outer peripheral edge of the diaphragm in a general
speaker, so that the cost of parts can be reduced.
[0015]
In the above configuration, a groove serving as an adhesive reservoir is formed at the outer
peripheral edge of the damper fixed to the diaphragm, and a portion of the damper adjacent to
the groove is adhered and fixed to the diaphragm. This eliminates the possibility of the adhesive
flowing down along the tapered diaphragm, and makes it possible to define the relative position
between the damper and the diaphragm with high accuracy by using the grooved adhesive
reservoir as a positioning portion.
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[0016]
Further, in the above configuration, the yoke holding and fixing the damper has a first yoke and a
second yoke for sandwiching the damper, and the first yoke and the second yoke extend in the
circumferential direction. If the concavo-convex fitting is performed at a plurality of places, not
only the magnetic efficiency of the yoke is improved, but also the damper is easily attached to the
yoke with high positional accuracy using the fitting convex part of the first yoke or the second
yoke. Can.
[0017]
An embodiment will be described with reference to the drawings. FIG. 1 is a cross-sectional view
of a loudspeaker according to a first embodiment of the present invention, and FIG. 2 is an
enlarged view of a portion A of FIG.
[0018]
The speaker 30 shown in FIG. 1 includes a magnetic circuit 31 in which magnetic gaps G1 and
G2 are provided side by side with a predetermined interval, and a pair of coils 32 wound around
a bobbin 32 and disposed in the magnetic gaps G1 and G2. A diaphragm 35 made of voice coils
33 and 34 and a cone paper formed in a tapered shape and whose inner peripheral edge is
adhesively fixed to a base end (upper end in the figure) of the bobbin 32 and a magnetic circuit
31 are integrated. The bobbin 32 and the diaphragm 35 are held and fixed between the frame 37
supporting the outer peripheral edge of the diaphragm 35 through the edge 36 and the
cylindrical yoke 41 and the tapered yoke 42 of the magnetic circuit 31. It is mainly composed of
a resiliently supported damper 38 and a dustproof cap 39 crowned to the bobbin 32.
In the speaker 30, the tapered diaphragm 35 is disposed so as to surround the magnetic circuit
31 and the bobbin 32. Therefore, the thickness reduction is realized while suppressing the
overall height dimension.
[0019]
The magnetic circuit 31 has a substantially cylindrical laminated body in which a magnet 40 is
interposed between the lower yoke 43 and the upper yoke 44, an annular plate-like yoke 45
surrounding the lower yoke 43 via the magnetic gap G1, and The cylindrical yoke 41 erected on
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the outer periphery of the annular plate-like yoke 45, and the tapered yoke 42 surrounding the
upper yoke 44 via the magnetic gap G2 are formed.
The magnet 40 is magnetized in the axial direction, and each yoke 41 to 45 is made of a
magnetic material such as iron.
The frame 37 on which the lower yoke 43 of the magnetic circuit 31 and the annular plate-like
yoke 45 are mounted and fixed is made of a nonmagnetic material such as an aluminum alloy.
[0020]
An annular plate-like yoke 45, a cylindrical yoke 41, and a tapered yoke 42 located radially
outside the magnetic gaps G1 and G2 in the magnetic circuit 31 form a magnetic path from the
magnetic gap G1 to the magnetic gap G2. Integrated to make
The cylindrical yoke 41 and the annular plate-like yoke 45 are bonded and fixed to each other,
but both 41 and 45 may be an integral product. As shown in FIG. 2, on the upper end surface of
the cylindrical yoke 41 in the drawing, convex portions 41 a are protruded at a plurality of
places along the circumferential direction, and the convex portions 41 a are engraved on the
lower end surface in the drawing of the tapered yoke 42. The cylindrical yoke 41 and the tapered
yoke 42 are engaged with each other in a state in which the damper 38 is sandwiched by being
fitted into the recess provided. In addition, the engagement hole 38a for penetrating the convex
part 41a is formed in the multiple places along the circumferential direction of the damper 38.
As shown in FIG.
[0021]
The inner peripheral edge portion of the damper 38 is adhesively fixed to the outer peripheral
surface of the bobbin 32 at the middle of the two places where the voice coils 33 and 34 are
wound. In other words, the bobbin 32 is not only supported at its base end (upper end in the
figure) by the diaphragm 35, but it is also elastically supported by the damper 38 at the
circumferential portion located in the middle between the wound portions of both voice coils 33
and 34. It is done. On the other hand, the outer peripheral edge of the damper 38 is adhesively
fixed in the vicinity of the outer peripheral edge of the diaphragm 35 supported by the edge
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portion 36, and the outer peripheral edge of the diaphragm 35 is elastically supported by the
damper 38. The engaging holes 38a are formed at a plurality of locations at radially intermediate
portions of the damper 38, and as shown in FIG. 2, the peripheral portion of the engaging holes
38a is held between the cylindrical yoke 41 and the tapered yoke 42. It is worn. Further, since
the width dimension in the radial direction of the engagement hole 38a and the convex portion
41a of the cylindrical yoke 41 is set to be substantially equal, by inserting the convex portion
41a into the engagement hole 38a at the time of assembly work The positioning of the damper
38 with respect to the cylindrical yoke 41 can be performed. As shown in FIG. 1, the posture of
the damper 38 at the time of non-energization in which the vibration system is not vibrating is
set along a plane orthogonal to the axial direction.
[0022]
The speaker 30 configured in this way is used with the upper side shown in the drawing as the
front direction, and an audio current is supplied to the voice coils 33 and 34 via a lead wire (not
shown). That is, since the electromagnetic force acts on the voice coils 33 and 34 in the magnetic
gaps G1 and G2 and the bobbin 32 vibrates when the audio current is supplied, the diaphragm
35 is driven to vibrate and a sound is output.
[0023]
Further, in the speaker 30, since both the bobbin 32 and the diaphragm 35 are elastically
supported by the damper 38, the rolling phenomenon of the bobbin 32 is suppressed even at
high input, and a sufficient amplitude amount can be secured in the vibration system. Therefore,
good acoustic performance can be ensured in the low frequency range. Further, the speaker 30
has the diaphragm 35 exposed largely in the front direction, and no acoustic obstacle is present
in the front, so that good acoustic performance can be ensured even in the middle to high range.
[0024]
In this embodiment, the inner peripheral portion of one damper 38 elastically supports the
bobbin 32, and the outer peripheral portion of the damper 38 elastically supports the diaphragm
35, but the sizes are different. Using two dampers, the outer peripheral edge of one small
diameter damper and the inner peripheral edge of the other large diameter second damper are
sandwiched between the yokes 41 and 42, and the inner peripheral edge of the small diameter
damper May be bonded and fixed to the bobbin 32, and the outer peripheral edge portion of the
large diameter damper may be bonded and fixed to the diaphragm 35.
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[0025]
FIG. 3 is a cross-sectional view of a loudspeaker according to a second embodiment of the
present invention. The same reference numerals as in FIG. 1 denote the same parts in FIG.
[0026]
The speaker 50 shown in FIG. 2 is configured such that the damper 38 is extended outward in
the radial direction of the diaphragm 35 and fixed to the frame 37, and the diaphragm 35 is
supported by the frame 37 via the extension portion 38b. The point is different from the speaker
30 of the first embodiment described above.
Therefore, in the speaker 50, the edge portion interposed between the frame and the outer
peripheral edge portion of the diaphragm can be omitted in a general speaker, which has an
advantage that the cost of parts can be reduced.
Also, when the diaphragm 35 is supported by the same member (damper 38) in this way, stress
does not act on the diaphragm 35 even if temperature or humidity changes, so that the acoustic
performance is stabilized. is there. Also in this second embodiment, two dampers having different
sizes may be used, and the small diameter damper may be used to elastically support the bobbin
32 and the large diameter damper may be used to elastically support the diaphragm 35.
[0027]
4 is a cross-sectional view of a loudspeaker according to a third embodiment of the present
invention, and FIG. 5 is an enlarged view of a portion B of FIG. 4. The same reference numerals as
in FIG. Do.
[0028]
In the speaker 60 shown in FIG. 4 and FIG. 5, a groove 38 c to be an adhesive reservoir is formed
at the outer peripheral edge of the damper 38.
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Then, a portion adjacent to the groove 38c in the outer peripheral edge portion of the damper 38
is adhesively fixed to the outer peripheral edge portion of the diaphragm 35, and the edge
portion 36 supports the diaphragm 35 slightly ahead of the damper 38. The point is different
from the speaker 30 of the first embodiment described above. Therefore, compared with the first
embodiment, this speaker 60 can reduce the diameter of the frame 37 even if the stroke of the
vibration system is equal. Further, the speaker 60 has an advantage of being able to correspond
to various frames having different diameters since the attachment position of the edge portion
36 to the diaphragm 35 can be appropriately selected. Further, since the speaker 60 has the
groove portion 38c which is an adhesive reservoir, there is no possibility that the adhesive flows
down along the tapered diaphragm 35, and the relative position between the damper 38 and the
diaphragm 35 with the groove portion 38c as a positioning portion It has the advantage that the
position can be defined with high accuracy. Also in this third embodiment, two dampers having
different sizes may be used, and the small diameter damper may be used to elastically support
the bobbin 32 and the large diameter damper may be used to elastically support the diaphragm
35.
[0029]
FIG. 6 is a cross-sectional view of a loudspeaker according to a fourth embodiment of the present
invention, in which the parts corresponding to FIG.
[0030]
In the speaker 70 shown in FIG. 6, the dustproof cap 39 in the first embodiment (speaker 30)
described above is removed and the spacers 70 and 71 are fixed on the upper yoke 44 of the
magnetic circuit 31. The portion 72 supports the inner peripheral edge of the diaphragm 35, and
a screw hole 71 a is formed in the central portion of the spacer 71.
The speaker 70 can be easily fastened and fixed to the speaker grill 80 by screwing the fixing
screw 81 penetrating the speaker grill 80 disposed on the front surface into the screw hole 71 a
of the spacer 71. However, preferably, an elastic member 82 such as a sponge is interposed
between the outer peripheral portion of the frame 37 and the speaker grill 80.
[0031]
In each of the above embodiments, the magnetic circuit having a two-gap structure in which the
magnetic gap G1 for disposing the voice coil 33 and the magnetic gap G2 for disposing the voice
coil 34 has been described. It is needless to say that the same effect as described above can be
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obtained by elastically supporting the bobbin 32 and the diaphragm 35 with dampers.
[0032]
FIG. 1 is a cross-sectional view of a speaker according to a first embodiment of the present
invention.
It is the A section enlarged view of FIG. It is sectional drawing of the speaker based on 2nd
Example of this invention. It is sectional drawing of the speaker based on 3rd Example of this
invention. It is the B section enlarged view of FIG. It is sectional drawing of the speaker based on
4th Example of this invention. It is sectional drawing of the speaker which concerns on a prior art
example. It is sectional drawing of the speaker which concerns on another prior art example.
Explanation of sign
[0033]
30, 50, 60, 70 Speaker 31 Magnetic circuit 32 Bobbin 33, 34 Voice coil 35 Diaphragm 36 Edge
part 37 Frame 38 Damper 38a Engagement hole 38b Extension part 38c Groove part 39
Dustproof cap 40 Magnet 41 Cylindrical yoke (first Yoke 41a Convex part 42 Tapered yoke
(second yoke) 70, 71 Spacer 80 Speaker grill 81 Fixing screw G1, G2 Magnetic gap
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