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DESCRIPTION JP2003219497

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DESCRIPTION JP2003219497
[0001]
The present invention relates to a small diameter cylindrical portion to which a bobbin wound
with a voice coil is fitted, a large diameter cylindrical portion fixed to a speaker frame, the small
diameter cylindrical portion, and the large diameter cylindrical portion. The present invention
relates to a speaker damper having an arm part bridged with the part.
[0002]
2. Description of the Related Art In FIG. 6, which is a cross-sectional view of a conventional
loudspeaker, a magnetic circuit 1 is stacked on a yoke 5 having a center pole portion 3 formed at
its central portion, and the yoke 5 A top plate 13 is formed of an annular magnet 9 provided with
a hole 7 through which 3 is inserted, and a top plate 13 laminated on the magnet 9 and provided
with a hole 11 through which the center pole portion 3 is inserted at the center. A magnetic gap
15 is formed between the inner wall surface of the hole 11 and the circumferential surface of the
center pole portion 3.
[0003]
The magnetic circuit 1 is provided on the lower surface of the truncated cone-shaped frame 17.
The outer peripheral portion of the diaphragm 21 is attached to the upper portion of the frame
17 via the edge member 19, and the bobbin 25 around which the voice coil 23 is wound is
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attached to the inner peripheral portion of the diaphragm 21.
[0004]
The bobbin 25 is supported by a damper 27 formed by injection molding of a resin provided on
the frame 17 so that the voice coil 23 is positioned between the magnetic gaps 15 of the
magnetic circuit 1.
[0005]
As shown in FIG. 7 which is an enlarged view seen from the plane, the damper 27 has an inner
ring portion 27a to which the bobbin 25 around which the voice coil 23 is wound is fitted and an
outer ring portion 27b fixed to the frame 17 of the speaker. And a plurality of arm portions 27c
bridged between the inner ring portion 27a and the outer ring portion 27b.
[0006]
The arm portion 27c is disposed between the inner ring portion 27a and the outer ring portion
27b and extends in the circumferential direction. The arm portion main body 27d is connected to
the inner ring portion 27a from one end of the arm portion main body 27d. The ring connection
portion 27e and an outer ring connection portion 27f connected to the outer ring portion 27b
from the other end of the arm portion main body 27d.
[0007]
Furthermore, the diaphragm 21 is provided with a cap 33 for preventing dust from entering the
bobbin 25.
Then, when a voice current flows through the voice coil 23, the voice coil 23 is driven, the
diaphragm 21 vibrates via the bobbin 25, and a sound is generated.
[0008]
However, as shown in FIG. 6, since the damper 27 is plate-like (planar), the connecting portion of
the arm 27c of the damper 27 to the inner ring 27a (bobbin 25) is also It is on the same plane.
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Therefore, when the bobbin 25 moves in the axial direction, there is a problem that the bobbin
25 is laterally shaken (rolling).
[0009]
In addition, since the arm portion 27c is arranged in one direction, if the bobbin 25 around
which the voice coil 23 is wound vibrates in the axial direction, the stroke can be sufficiently
taken. Therefore, a rotational force in the circumferential direction acts on the bobbin 25 and a
rotational force acts on the edge member 19 through the diaphragm 21 and the edge member
19 is twisted, causing distortion in the reproduced sound. It will occur.
Furthermore, since the edge member 19 is twisted, the stroke amount of the edge member 19 is
reduced, and the stroke amount as designed can not be obtained. In addition, stress is
concentrated on the inner ring connecting portion 27e and the outer ring connecting portion 27f
which are the root of the arm portion 27c, so that material fatigue tends to occur, and there is a
problem in durability.
[0010]
Furthermore, in the case of a bobbin on which a voice coil having a shape that does not perform
absolute rotational movement, for example, an oval or track shape, is wound, the damper 27 in
which the arm portions 27c are arranged in one direction can not be used.
[0011]
As a damper in which no rotational force acts on the bobbin 25, there is a damper in which half
of the arm portions of the plurality of arm portions are in the opposite direction, but there is a
problem that the stroke can not be sufficiently obtained.
[0012]
The present invention has been made in view of the above problems, and a first object of the
present invention is to provide a speaker damper in which the bobbin does not shake sideways.
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The second problem is to provide a speaker damper in which a sufficient stroke occurs and a
rotational force does not act on the bobbin.
[0013]
The third problem is to provide a speaker damper having excellent durability.
[0014]
The invention according to claim 1 which solves the above problems is a small diameter
cylindrical portion to which a bobbin wound with a voice coil is fitted, and a large diameter
cylindrical portion fixed to a speaker frame In the speaker damper having the small diameter
cylindrical portion and the arm portion bridged between the large diameter cylindrical portion,
the arm portion is an even number, and each arm portion is the small diameter cylindrical
portion, the large diameter An arm portion main body disposed between the cylindrical portions
and extending in the circumferential direction, a small diameter cylindrical connection portion
connected from one end of the arm portion main body to the outer cylindrical surface of the
small diameter cylindrical portion, and the arm portion main body The small diameter tube
connection portion and the large diameter tube connection portion of one arm portion of the
adjacent arm portions, and the large diameter tube connection portion connected to the inner
tube surface of the large diameter tube portion from the other end of Are connected in the
vicinity of one open surface of the small diameter cylindrical portion and the large diameter
cylindrical portion, and The small-diameter cylindrical connecting portion and the large diameter
tubular connecting portion parts, the small diameter cylinder portion, a speaker damper,
characterized in that it is connected to the other open surface near the large-diameter cylindrical
portion.
[0015]
Among the adjacent arm portions, the small diameter cylinder connection portion and the large
diameter cylinder connection portion of one arm portion are connected in the vicinity of one
open surface of the small diameter cylinder portion and the large diameter cylinder portion, and
the other arm portion The small diameter cylinder connection portion and the large diameter
cylinder connection portion are connected to the vicinity of the other open surface of the small
diameter cylinder portion and the large diameter cylinder portion, whereby the bobbin of the
arm portion of the speaker damper (small diameter cylinder portion) The connection of the two
parts is different in the axial direction of the bobbin.
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Therefore, even if the bobbin moves in the axial direction, lateral movement of the bobbin is less
likely to occur.
[0016]
According to the second aspect of the present invention, the small diameter cylindrical portion to
which the bobbin around which the voice coil is wound is fitted, the large diameter cylindrical
portion fixed to the speaker frame, the small diameter cylindrical portion, and the large diameter
cylindrical portion A speaker damper having an arm portion bridged between, wherein the arm
portion has the following configuration.
(1) There are a plurality of the arm portions.
(2) The arm portion is disposed between the small diameter cylindrical portion and the large
diameter cylindrical portion, and extends in the circumferential direction, the arm portion main
body, and the outside of the small diameter cylindrical portion from one end of the arm portion
main body It consists of a small diameter cylinder connection part connected to a cylinder
surface, and a large diameter cylinder connection part connected to an inner cylinder surface of
the large diameter cylinder part from the other end of the arm part main body. (3) The
longitudinal cross-sectional shape of the said arm part main body is wavelike. (4) The arm
portion main body has a flat shape smaller than the width of the arm portion main body. (5) The
arm portion main body of the arm portion is roughly divided into two groups having different
directions of extension from the large diameter cylinder connecting portion to the small diameter
cylinder connecting portion, and the elastic coefficient in the circumferential direction of one
whole group and the other The elastic coefficients in the circumferential direction of the entire
group of are substantially equal.
[0017]
The arm portion has a plurality of arm portions, and the arm portion main body of the arm
portion is roughly divided into two groups extending in different directions from the large
diameter cylinder connection portion to the small diameter cylinder connection portion. The
rotational force is not generated in the bobbin because the elastic modulus and the elastic
modulus in the circumferential direction of the other group are substantially equal. Since no
rotational force is generated on the bobbin, no twist is generated on the edge of the diaphragm,
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so that distortion can be prevented from occurring in the reproduced sound.
[0018]
Since the thickness of the arm portion main body is a flat shape smaller than the width of the
arm portion main body, lateral movement of the bobbin is less likely to occur even when the
bobbin moves in the axial direction. Since the longitudinal cross-sectional shape of the arm
portion main body is wavy, a sufficient stroke can be obtained, and since the stress concentration
on each connection portion is relaxed by extending the arm itself, the durability is also improved.
[0019]
In the invention according to claim 3, the small diameter cylinder connecting portion and the
large diameter cylinder connecting portion of one of the two arm portions adjacent to each other
are the open surfaces of one of the small diameter cylinder and the large diameter cylinder. The
small diameter tube connecting portion and the large diameter tube connecting portion of the
other arm portion are connected in the vicinity, and the small diameter tube connecting portion
and the large diameter tube connecting portion are connected in the vicinity of the other open
surfaces of the small diameter tube portion and the large diameter tube portion. It is a damper
for speakers of 2 ..
[0020]
The small diameter cylinder connection portion and the large diameter cylinder connection
portion of one of the two arm portions adjacent to each other are connected in the vicinity of one
open surface of the small diameter cylinder portion and the large diameter cylinder portion, and
the other arm The small diameter tube connection portion and the large diameter tube
connection portion of the portion are connected to the other small open surface of the small
diameter tube portion and the large diameter tube portion, thereby connecting the bobbin of the
arm portion of the speaker damper (small diameter tube portion The connection with) is in two
different parts in the axial direction of the bobbin.
Therefore, even if the bobbin moves in the axial direction, lateral movement of the bobbin is less
likely to occur.
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[0021]
The invention according to claim 4 is characterized in that the directions of extension from the
large diameter cylindrical portion to the small diameter cylindrical portion of the arm portion
main body of the arm portion are different in adjacent arm portions. It is a damper for speakers
described in.
[0022]
Since the directions in which the arms extend from the large diameter cylindrical portion to the
small diameter cylindrical portion of the arm portion main body of the arm portion are different
at adjacent arm portions, the force for axially moving the bobbin without rotating the bobbin is It
occurs uniformly in the circumferential direction.
[0023]
The invention according to claim 5 is the damper for a speaker according to any one of claims 1
to 4, characterized in that the bus-line length is longer than the thickness of the cylinder of the
small diameter cylindrical portion.
When the bus length is longer than the thickness of the small-diameter cylindrical portion, the
distance between the connection portion of the speaker damper arm and the bobbin (smalldiameter cylindrical portion) of the damper is increased, and lateral deflection of the bobbin is
less likely to occur. Become.
[0024]
The invention according to claim 6 is characterized in that a plurality of ribs in a direction
intersecting with the generatrix direction are provided on the inner cylindrical surface of the
small diameter cylindrical portion in which the bobbin is fitted. Speakers for speakers.
[0025]
By providing a plurality of ribs in the direction intersecting with the generatrix direction on the
inner cylindrical surface of the small diameter cylindrical portion to which the bobbin is fitted,
when attaching the bobbin and the small diameter cylindrical portion of the speaker damper with
an adhesive Since the rib is blocked by the rib, it is possible to easily attach the bobbin and the
speaker damper even using a highly fluid adhesive.
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[0026]
The invention according to claim 7 is characterized in that the material is a polyester-based
thermoplastic elastomer, and is a multiblock copolymer in which a crystalline aromatic polyester
is a hard segment, a polyether or an aliphatic polyester is a soft segment. It is a damper for
speakers in any one of Claims 1-6.
[0027]
By using such a material, a speaker damper having excellent acoustic characteristics and
durability can be obtained.
The invention according to claim 8 is characterized in that the material is a synthetic resin whose
main component is polypropylene, and at least one fiber of polymetaphenylene isophthalamide
fiber, polyparaphenylene terephthalamide fiber, and polybenzazole fiber is used. The speaker
damper according to any one of claims 1 to 6, wherein the damper is a mixture.
[0028]
Durability is further improved by using such a material.
[0029]
DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention
will be described with reference to the drawings.
1 is a perspective view of the speaker damper of the embodiment as viewed from one side (upper
side), FIG. 2 is a perspective view of the speaker damper of FIG. 1 as viewed from the other side
(lower side), and FIG. FIG. 4 is a top view of the speaker damper, FIG. 4 is a cross-sectional view
taken along line A-A in FIG. 3, and FIG. 5 is a cross-sectional view taken along line B-B in FIG.
[0030]
The material of the speaker damper 100 according to the present embodiment is a polyester-
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based thermoplastic elastomer, which is a multiblock copolymer in which crystalline aromatic
polyester is a hard segment, polyether or aliphatic polyester is a soft segment. Using.
[0031]
As shown in FIGS. 1, 2 and 3, the speaker damper 100 comprises a small diameter cylindrical
portion 200 in which a bobbin wound with a voice coil is fitted, and a large diameter cylindrical
portion 300 fixed to the speaker frame. The small diameter cylindrical portion 200 and the large
diameter cylindrical portion 300 are bridged between the same shaped arm portions 400 and
400 ′.
[0032]
In the present embodiment, the arm portion 400 and the arm portion 400 'are alternately
provided to be adjacent to each other, and there are three arm portions 400 and three arm
portions 400'.
The arm portions 400 and 400 'are disposed between the small diameter cylindrical portion 200
and the large diameter cylindrical portion 300, and extend in the circumferential direction to the
arm portion main bodies 410 and 410' and one end of the arm portion main bodies 410 and 410
'. The small-diameter cylindrical connection portions 430 and 430 'connected to the outer
cylindrical surface of the small-diameter cylindrical portion 200, and the large-diameter
cylindrical portion connected to the inner cylindrical surface of the large-diameter cylindrical
portion 300 from the other end of the arm portion bodies 410 and 410'. It consists of diameter
tube connection parts 440 and 440 '.
[0033]
Adjacent arm portions 400 and arm portions 400 ′ are different in the direction of extension
from the large diameter cylindrical portion 300 of the arm portion main bodies 410, 410 ′ to
the small diameter cylindrical portion 200.
Further, as shown in FIGS. 1 and 2, the small diameter cylindrical connection portion 430 and
the large diameter cylindrical connection portion 440 of one of the adjacent arm portions 400
and 400 ′ are the small diameter cylindrical portion 200, The small diameter cylinder
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connection portion 430 'and the large diameter cylinder connection portion 440' of the other
arm portion 400 ', which are connected near one open surface (upper open end surface) of the
diameter cylinder portion 300, are the small diameter cylinder portion 200, large diameter It is
connected in the vicinity of the other open surface (lower open end surface) of the diameter
cylindrical portion 300.
[0034]
Furthermore, as shown in FIG. 4, the longitudinal cross-sectional shapes of the arm portion
bodies 410 and 410 'of the arm portions 400 and 400' are wavy, and further, the corrugations of
the arm portion main body 410 and the arm portion main body 410 ' The direction of is
opposite, ie, when one is a mountain, the other is a valley.
[0035]
As shown in FIG. 5, the thickness (t) of the arm body 410, 410 'is flat and smaller than the width
(w) of the arm body 410, 410'.
In the small diameter cylindrical portion 200, the bus length (L) is longer than the thickness (T)
of the cylinder.
[0036]
As shown in FIGS. 1, 2 and 3, a plurality of ribs 201 in the direction intersecting the generatrix
direction are provided on the inner cylindrical surface of the small diameter cylindrical portion
200 in which the bobbin is fitted.
The following effects can be obtained in the speaker damper 100 configured as described above.
[0037]
(1) There are three arm parts 400 and 400 'of the same material and the same shape, which have
different directions of extension from the large diameter cylindrical part 300 to the small
diameter cylindrical part 200 of the arm main parts 410 and 410'.
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[0038]
Therefore, since the elastic coefficient in the circumferential direction of the entire arm 400 and
the elastic coefficient in the circumferential direction of the arm 400 'are substantially equal, no
rotational force is generated on the bobbin.
Since no rotational force is generated on the bobbin, no twist is generated on the edge of the
diaphragm, so that distortion can be prevented from occurring in the reproduced sound.
[0039]
(2) As shown in FIG. 5, the thickness (t) of the arm portion main bodies 410 and 410 'is a flat
shape smaller than the width (w) of the arm portion main bodies 410 and 410'. Even if it moves,
the lateral movement of the bobbin hardly occurs.
[0040]
(3) As shown in FIG. 4, the vertical cross-sectional shape of the arm portion main bodies 410 and
410 ′ of the arm portions 400 and 400 ′ is wavy, so that a sufficient stroke can be obtained. ,
410 ', stress concentration on each connection is alleviated and durability is also improved.
[0041]
(4) As shown in FIG. 1 and FIG. 2, the small diameter cylinder connection portion 430 and the
large diameter cylinder connection portion 440 of one arm portion 400 among the adjacent arm
portions 400 and 400 ′ are the small diameter cylinder portion 200, A small diameter
cylindrical connection portion 430 'and a large diameter cylindrical connection portion 440' of
the other arm portion 400 ', which are connected near one open surface (upper open end
surface) of the large diameter cylindrical portion 300, are a small diameter cylindrical portion
200, By connecting in the vicinity of the other open surface (lower open end surface) of the large
diameter cylindrical portion 300, connection of the arm portions 400 and 400 'of the speaker
damper 100 with the bobbin (small diameter cylindrical portion 200) is There are two different
parts in the axial direction.
Therefore, even if the bobbin moves in the axial direction, lateral movement of the bobbin is less
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likely to occur.
[0042]
(5) The arm portions 400 and 400 'having different directions of extending from the large
diameter cylindrical portion 300 to the small diameter cylindrical portion 200 of the arm portion
main bodies 410 and 410' are alternately arranged to be adjacent to each other, thereby rotating
the bobbin. Without this, the force to move in the axial direction is uniformly generated in the
circumferential direction of the bobbin.
[0043]
(6) As shown in FIG. 5, in the small diameter cylindrical portion 200, the bobbin length (L) is
longer than the thickness (T) of the cylinder, so that the bobbin of the arm portion 400 of the
speaker damper 100 The distance between the connecting portion with the (small-diameter
cylindrical portion 200) is increased, and further, lateral deflection of the bobbin is less likely to
occur.
[0044]
(7) By providing a plurality of ribs 201 in the direction intersecting the generatrix direction on
the inner cylindrical surface of the small diameter cylindrical portion 200 with which the bobbin
is fitted, the bobbin and the small diameter cylindrical portion 200 of the speaker damper 100
Since the adhesive is blocked by the ribs 201 when attaching at the time of mounting, it is
possible to easily attach the bobbin and the speaker damper 100 even if a highly fluid adhesive is
used.
[0045]
(8) As a material of the damper 100 for a speaker, a polyester-based thermoplastic elastomer
consisting of a multiblock copolymer in which a crystalline aromatic polyester is a hard segment
and a polyether or an aliphatic polyester is a soft segment is used. Thus, a speaker damper
having excellent acoustic characteristics and durability can be obtained.
[0046]
The present invention is not limited to the above embodiment.
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In the above embodiment, three arm portions 400 and 400 'having the same shape and
extending in different directions extending from the large diameter cylindrical portion 300 to the
small diameter cylindrical portion 200 of the arm portion main bodies 410 and 410' are
provided.
However, the arm portion main body of the arm portion is roughly divided into two groups
different in the direction of extension from the large diameter cylinder connection portion to the
small diameter cylinder connection portion, and the elastic coefficient of one group as a whole
and the other group as a whole. The arm portions 400 and 400 'may not have the same shape or
the same number if the elastic coefficients in the circumferential direction are substantially equal.
[0047]
In addition, as a material of the speaker damper 100, at least one kind of fibers of
polymetaphenylene isophthalamide fiber, polyparaphenylene terephthalamide fiber, and
polybenzazole fiber are mixed with a synthetic resin mainly composed of polypropylene. It may
be
Durability is further improved by using such a material.
[0048]
As described above, according to the invention of claim 1, the small diameter cylinder connection
portion and the large diameter cylinder connection portion of one of the adjacent arm portions
are the small diameter cylinder portion, The small diameter cylinder connection portion and the
large diameter cylinder connection portion of the other arm portion, which are connected near
one open surface of the large diameter cylinder portion, are near the other open surface of the
small diameter cylinder portion and the large diameter cylinder portion. By being connected, the
connection between the arm portion of the speaker damper and the bobbin (small diameter
cylindrical portion) is at two different portions in the axial direction of the bobbin.
Therefore, even if the bobbin moves in the axial direction, lateral movement of the bobbin is less
likely to occur.
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[0049]
According to the invention of claim 2, there are a plurality of the arm portions, and the arm
portion main body of the arm portion is roughly divided into two groups having different
directions of extending from the large diameter cylinder connection portion to the small diameter
cylinder connection portion. Since the elastic modulus in the circumferential direction of one
group is substantially equal to the elastic modulus in the circumferential direction of the other
group, no rotational force is generated on the bobbin.
Since no rotational force is generated on the bobbin, no twist is generated on the edge of the
diaphragm, so that distortion can be prevented from occurring in the reproduced sound.
[0050]
Since the thickness of the arm portion main body is a flat shape smaller than the width of the
arm portion main body, lateral movement of the bobbin is less likely to occur even when the
bobbin moves in the axial direction.
Since the longitudinal cross-sectional shape of the arm portion main body is wavy, a sufficient
stroke can be obtained, and since the stress concentration on each connection portion is relaxed
by extending the arm itself, the durability is also improved.
[0051]
According to the invention of claim 3, the small diameter cylinder connecting portion and the
large diameter cylinder connecting portion of one of the two arm portions adjacent to each other
are one of the small diameter cylinder portion and the large diameter cylinder portion. The small
diameter tube connection portion and the large diameter tube connection portion of the other
arm portion are connected in the vicinity of the open surface, and are connected in the vicinity of
the other open surface of the small diameter tube portion and the large diameter tube portion.
The connection of the arm portion of the damper to the bobbin (small diameter cylindrical
portion) is at two different portions in the axial direction of the bobbin.
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Therefore, even if the bobbin moves in the axial direction, lateral movement of the bobbin is less
likely to occur.
[0052]
According to the invention of claim 4, the direction from the large diameter cylindrical portion of
the arm portion main body of the arm portion to the small diameter cylindrical portion is
different in the adjacent arm portions, so that the bobbin is not rotated. The force to move in the
axial direction is uniformly generated in the circumferential direction of the bobbin.
[0053]
According to the fifth aspect of the present invention, since the bus bar length is longer than the
thickness of the cylinder of the small diameter cylindrical portion, the distance between the
connection portion with the bobbin (small diameter cylindrical portion) of the arm portion of the
speaker damper becomes wide. Furthermore, lateral movement of the bobbin is less likely to
occur.
[0054]
According to the invention of claim 6, by providing a plurality of ribs in the direction intersecting
with the generatrix direction on the inner cylindrical surface of the small diameter cylindrical
portion fitted with the bobbin, the small diameter cylindrical portion of the bobbin and the
speaker damper Since the adhesive is blocked by the ribs when attaching with an adhesive, the
bobbin and the speaker damper can be easily attached even with a high flow adhesive.
[0055]
According to the invention of claim 7, by using such a material, a speaker damper having
excellent acoustic characteristics and durability can be obtained.
According to the eighth aspect of the invention, the durability is further improved by using such
a material.
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