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JP2008306380

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DESCRIPTION JP2008306380
The present invention provides a speaker that withstands a large input by suppressing the
transfer of heat of a voice coil to a diaphragm. A speaker (1) includes a heat sink (13) joined to a
front end of a bobbin (7) and a coupler (14) joined to a front face of the heat sink and a rear face
of a diaphragm (11). The heat sink 13 includes an inner bottom portion having a concave cross
section, and a first flange portion extending from the front end portion of the inner bottom
portion toward the outer periphery and whose rear surface is in contact with the front end
portion of the bobbin. A diaphragm receiving portion joined to the rear surface portion of the
plate 11, an inner leg portion disposed rearward from the inner peripheral portion of the
diaphragm receiving portion to form a hollow portion at the center, and an outer peripheral
portion of the diaphragm receiving portion And an outer leg disposed on the rear side. The inner
leg of the coupler 14 is joined to the inner bottom of the heat sink 13, and the outer leg of the
coupler 14 is joined to the outer periphery of the first ridge of the heat sink 13. With this
structure, the heat generated by the voice coil 8 can be efficiently dissipated through the heat
sink 13. [Selected figure] Figure 1
スピーカ
[0001]
The present invention relates to a speaker used for various audio devices, information
communication devices, and the like.
[0002]
A conventional general speaker 100 is joined to a cylindrical magnet 101, a top plate 102 joined
to the front surface of the magnet 101, and the bottom of the magnet 101, as shown in FIG. The
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magnetic circuit 105 is formed and formed of a yoke 104 having a center pole 103 projecting
upward, a bobbin 106 disposed so as to surround at least a part of the magnetic circuit 105, and
a bobbin 106 A voice coil 107 disposed in the magnetic gap of the magnetic circuit 105 and
capable of oscillating back and forth, a frame 108 joined to the magnetic circuit 105, and an
inner peripheral part thereof joined to one end of the bobbin 106; The diaphragm 110 is
supported by the frame 108 through the edge 109, and the inner peripheral portion is joined to
the bobbin 106, and the outer peripheral portion A damper 111 which is supported by the
middle portion of the frame 108, includes a has a structure in which a cap 112 for covering the
front center portion of the diaphragm.
[0003]
In the speaker 100 configured as described above, the diaphragm 110 vibrates by applying an
audio current to the voice coil 107 and a sound is generated, but at the same time, the voice coil
107 generates heat.
The heat generated in the voice coil 107 is directly transmitted to the bobbin 106, the diaphragm
110, and the cap 112 and dissipated. However, since the heat can not be dissipated sufficiently
at a large amplitude, the voice coil 107 is thermally destroyed. There was a problem that.
[0004]
In recent years, with the improvement of the amplifier performance for driving a speaker, a
speaker that can withstand a large input is required.
From such a background, the heat resistance performance of the voice coil itself has been
improved, and it has come to be able to withstand a large input.
[0005]
However, as the heat resistance of the voice coil is improved, the voice coil generates heat at a
higher temperature than before when the input is large, and thus the temperature of the bobbin
rises more than before and the heat increases. It became transmitted to the diaphragm. Recently,
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since a resin such as polypropylene is often used as the material of the diaphragm for good
appearance and high rigidity, etc., the diaphragm near the joint of the bobbin by the heat
transmitted to the diaphragm. Part of the speaker may be softened and the speaker may be
damaged.
[0006]
Heretofore, there are, for example, (1) Japanese Patent Application Laid-Open No. 2004-260547
(Patent Document 1) and (2) Japanese Patent Application Laid-Open No. 2005-354296 (Patent
Document 2) as a speaker provided with measures for improving the heat radiation.
[0007]
In Patent Document 1, a frame, a diaphragm coupled to the frame, and a diaphragm coupled to
the frame for the purpose of efficiently radiating the heat of the voice coil to the outside through
the cap, and a part thereof A speaker comprising a voice coil disposed in a magnetic gap of the
magnetic circuit and a dust cap coupled to the bobbin so as to cover the voice coil, wherein a
damping material is coupled to the surface of the dust cap Speaker is disclosed (claim 1).
[0008]
Further, in Patent Document 2, a pole piece provided with a magnet on the front surface of the
bottom plate so that the heat generation of the voice coil and the magnetic circuit portion of the
speaker can be efficiently dissipated to the outside when the diaphragm has a large amplitude. A
speaker comprising: a plate in which an outer peripheral surface of a pole piece and an inner
peripheral surface are disposed opposite to each other via a magnetic gap, and a voice coil
bobbin having a voice coil in the magnetic gap is vibratably provided via a damper. A
substantially cylindrical air inlet / outlet control member having a first air inlet / outlet hole in
the coil bobbin and a second air inlet / outlet hole at the front of the post piece located inside the
voice coil bobbin Are fixed coaxially, and the pressure change on the back of the damper due to
the amplitude before and after the vibration system causes the center of the speaker and the
Performed inflow and out of the back side of the air over discloses a speaker, characterized by
cooling the voice coil (claim 1).
JP, 2004-260547, A JP, 2005-354296, A
[0009]
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However, the speakers of Patent Document 1 and Patent Document 2 have the following
problems.
[0010]
In patent document 1, in order to maintain the thermal radiation efficiency of a voice coil, the
voice coil bobbin or the dust cap is comprised with metal materials (claims 1, 2).
In Patent Document 2, a voice coil bobbin is provided with a first air outflow hole, and an air
inflow control member having a second air outflow hole is fixed to the front of the pole piece.
Therefore, each time the vibration system such as voice coil and diaphragm vibrates to the front
and back side, the back side of the damper becomes negative pressure and positive pressure
accordingly, and air is taken in and released alternately. The heat of the voice coil and the heat of
the magnetic circuit can be efficiently cooled by the air flowing in and out.
[0011]
As described above, both of Patent Document 1 and Patent Document 2 are configured to
enhance the heat radiation effect of heat generated in the voice coil, but there is a joint where the
voice coil bobbin and the diaphragm are in direct contact with each other, The heat of the voice
coil is easily transmitted to the diaphragm, and there is a problem that it is not a sufficient
measure against the softening of the diaphragm.
[0012]
The present invention has been made in view of such problems, and its object is to suppress the
transfer of the heat of the voice coil to the diaphragm while reducing the appearance and the
sound quality and having a simple configuration. , To provide a speaker that can withstand a
large input.
[0013]
According to one aspect of the present invention, a magnetic circuit including a magnet, a top
plate joined to the front of the magnet, and a yoke joined to the bottom of the magnet, and
surrounding at least a part of the magnetic circuit And a voice coil which is wound around the
bobbin and is disposed in the magnetic gap of the magnetic circuit so that it can oscillate back
and forth, a frame joined to the magnetic circuit, and an outer peripheral edge portion A speaker
comprising: a diaphragm supported by the frame through an edge; and a damper having an inner
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peripheral portion joined to the bobbin and an outer peripheral portion supported by the middle
step of the frame, the front end of the bobbin And a coupler joined to the front surface of the
heat sink and joined to the rear surface of the diaphragm. That the speaker is provided.
[0014]
Further, according to one aspect of the present invention, at least a portion of the magnetic
circuit includes a magnetic circuit including a magnet, a top plate joined to the front surface of
the magnet, and a yoke joined to the bottom surface of the magnet A voice coil disposed around
the bobbin, a voice coil disposed in the magnetic gap of the magnetic circuit and capable of
oscillating back and forth, a frame joined to the magnetic circuit, and A speaker comprising: a
diaphragm having a peripheral portion supported by the frame through an edge; and a damper
having an inner peripheral portion joined to the bobbin and an outer peripheral portion
supported by a middle step of the frame. There is provided a speaker including a heat sink joined
to the front stage and joined to the rear surface of the diaphragm.
[0015]
According to the present invention, it is possible to provide a speaker that withstands a large
input by suppressing the transfer of heat of the voice coil to the diaphragm while reducing the
appearance and the sound quality and having a simple configuration.
[0016]
Hereinafter, embodiments of the present invention will be described with reference to the
drawings.
[0017]
First Embodiment FIG. 1 is a cross-sectional view of a loudspeaker 1 according to a first
embodiment of the present invention.
The speaker 1 of FIG. 1 is joined to a cylindrical magnet 2, an annular top plate 3 joined to the
front surface of the magnet 2, and the bottom surface of the magnet 2, and is integrally formed
in the central part thereof. An outer magnetic type magnetic circuit 6 configured by a yoke
(bottom yoke) 5 having a center pole 4 protruding, a bobbin 7 disposed so as to surround at least
a part of the magnetic circuit 6, and a bobbin 7 The voice coil 8 which is wound and disposed in
the magnetic gap of the magnetic circuit 6 and can be oscillated back and forth, the frame 9
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joined to the magnetic circuit 6, and the outer peripheral edge portion to the frame 9 via the
edge 10 The diaphragm 11 to be supported, the damper 12 whose inner periphery is joined to
the bobbin 7 and whose outer periphery is supported by the middle step of the frame 9, the heat
sink 13 joined to the front end of the bobbin 7, and heat And a coupler 14 that is joined to the
rear face portion of the front portion and the diaphragm 11 of the link 13.
[0018]
The bobbin 7 is made of, for example, aluminum, and the diaphragm 11 is made of, for example,
polypropylene.
Further, a through hole for air inflow and outflow is provided at the center of the center pole 4.
[0019]
The heat sink 13 is formed of a material having high thermal conductivity, specifically, a metal
such as aluminum, iron, or a zinc alloy.
The coupler 14 is formed of a material having a lower thermal conductivity than the heat sink
13.
As a material of the coupler 14, for example, a resin material or a metal material is used, but in
the present embodiment, a resin material, specifically, an ABS resin is used.
[0020]
FIG. 2 is a cross-sectional view showing the detailed structure of the heat sink 13 and the coupler
14.
As shown in FIG. 2, the heat sink 13 extends from the front end portion of the inner bottom
portion 15 having a concaved cross section disposed inside the bobbin 7 and the inner bottom
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portion 15 toward the outer periphery, and the rear surface is in contact with the front end
portion of the bobbin And a first ridge portion 16 to be
The coupler 14 includes: a diaphragm receiving portion 17 joined to the rear surface portion of
the diaphragm 11; and an inner leg portion 18 disposed rearward from an inner peripheral
portion of the diaphragm receiving portion 17 to form a hollow portion at the center. And an
outer leg portion 19 disposed on the rear side from the outer peripheral portion of the
diaphragm receiving portion 17.
The inner leg 18 of the coupler 14 is joined to the inner bottom 15 of the heat sink 13, and the
outer leg 19 of the coupler 14 is joined to the outer periphery of the first ridge 16 of the heat
sink 13.
[0021]
In the speaker 1 of FIG. 1, when a large input is applied to the voice coil 8, the voice coil 8
generates high temperature heat, and this heat is transmitted to the heat sink 13 via the bobbin
7. The heat transferred to the heat sink 13 is efficiently dissipated from the surface of the heat
sink 13. A part of the air heated by the heat sink 13 passes through the inside of the yoke 5 and
flows to the rear of the speaker 1, and also flows into the space surrounded by the diaphragm
11, the damper 12 and the frame 9, thereby radiating heat. It will be.
[0022]
Since the coupler 14 having a low thermal conductivity is joined between the heat sink 13 and
the diaphragm 11, the heat transmitted to the heat sink 13 is not easily transmitted to the
diaphragm 11. Therefore, the problem that the diaphragm 11 is softened by the heat generated
from the voice coil 8 does not occur.
[0023]
As described above, the speaker 1 according to the first embodiment has a configuration in
which the heat sink 13 and the coupler 14 are disposed between the bobbin 7 and the
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diaphragm 11, and the heat generated by the voice coil 8 can be used as the heat sink 13. It is
possible to dissipate heat efficiently. As a result, the transmission of heat generated by the voice
coil 8 to the diaphragm 11 can be suppressed without impairing the appearance and the sound
quality and the speaker can withstand a large input.
[0024]
In addition, the coupler 14 also has a secondary effect of facilitating the work of assembling the
heat sink 13 and the diaphragm 11. If the coupler 14 is not present and the heat sink 13 and the
diaphragm 11 are directly joined, there is a problem that the alignment of the diaphragm 11 is
not easy and the workability at the time of assembly is poor. The coupler 14 of the present
embodiment is provided with the inner leg portion 18 and the outer leg portion 19 for bonding
the heat sink 13 and the diaphragm receiving portion 17 for bonding the diaphragm 11 in
advance. Positioning of the diaphragm 13 and the diaphragm 11 can be performed simply and
accurately.
[0025]
Although a space is formed between the heat sink 13 and the coupler 14 as shown in FIG. 1, the
weight can be reduced. The heat sink 13 and the coupler 14 constitute a vibrating portion
together with the vibrating plate 11. However, if the weight of the vibrating portion increases,
the driving efficiency decreases and the acoustic characteristics deteriorate. On the other hand,
when a space is formed between the heat sink 13 and the coupler 14 as in the present
embodiment, the weight of the vibrating portion can be reduced, and the acoustic characteristics
do not deteriorate.
[0026]
In the case where the heat sink 13 and the coupler 14 are formed of a lightweight material, it is
possible to have a structure having no space. Also, as described in the embodiments to be
described later, the air inlet and outlet may be provided at at least one place instead of
eliminating the space.
[0027]
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Second Embodiment The second embodiment is different from the first embodiment in the
structure of the heat sink.
[0028]
FIG. 3A is a cross-sectional view of the speaker 1a according to the second embodiment of the
present invention, and FIG. 3B is a top view of a heat sink 13a which is a component of the
speaker 1a.
In FIG. 3A and FIG. 3B, the same components as in FIGS. 1 and 2 are denoted by the same
reference numerals, and in the following, differences will be mainly described.
[0029]
As shown in FIGS. 3 (a) and 3 (b), the heat sink 13a has a plurality of substantially square second
ridges 20 (shown in FIG. 2) extending outward from the outer peripheral end of the first ridge 16
3 (b) has 3). The configuration other than the heat sink 13a is the same as that of the speaker 1
according to the first embodiment.
[0030]
The surface area of the heat sink 13a is larger than that of the heat sink 13 by the amount of the
second flange 20, and the heat generated by the voice coil 8 and transmitted to the heat sink 13a
can be dissipated more efficiently. A speaker with higher input resistance than the speaker 1
according to one embodiment can be provided.
[0031]
In addition, the shape and number of objects of the 2nd collar part 20 are not limited to those of
this embodiment, A various change is possible in the range which does not deviate from the
meaning of this invention.
[0032]
Third Embodiment A third embodiment is different from the second embodiment in the structure
of the second ridge portion.
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[0033]
FIG. 4 (a) is a cross-sectional view of a speaker 1b according to a third embodiment of the
present invention, and FIG. 4 (b) is a top view of a heat sink 13b which is a component of the
speaker 1b.
In FIGS. 4 (a) and 4 (b), the same components as in FIGS. 3 (a) and 3 (b) are denoted by the same
reference numerals, and in the following, differences will be mainly described.
[0034]
As shown in FIGS. 4 (a) and 4 (b), the heat sink 13b has three second ridges 20a each having a
substantially rectangular cross section extending outward from the outer peripheral end of the
first ridge 16 The uneven portion 21 is formed on the surface of the second ridge portion 20a to
increase the surface area.
The structure is the same as that of the speaker 1 a according to the second embodiment except
for the uneven portion 21.
[0035]
In the speaker 1b according to the third embodiment, the surface area of the second flange
portion 20a is increased by the uneven portion 21, and the heat generated by the voice coil 8
and transmitted to the heat sink 13b via the bobbin 7 is The flange portion 20a can efficiently
dissipate heat to the outside air.
Therefore, the speaker 1 b has higher input resistance than the speaker 1 a according to the
second embodiment.
[0036]
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The shape and the number of the second flanges 20a are not limited to those of the present
embodiment, and various modifications can be made without departing from the spirit of the
present invention as in the second embodiment. It is.
[0037]
Fourth Embodiment The fourth embodiment is different from the first embodiment in the
structure of the heat sink and the coupler.
[0038]
FIG. 5 (a) is a cross-sectional view of the speaker 1c according to the fourth embodiment of the
present invention, FIG. 5 (b) is a rear view of the coupler 14a which is a component of the
speaker 1c, and FIG. 5 (c) is a back surface of the coupler 14a. It is a perspective view.
In FIGS. 5 (a) to 5 (c), the same components as in FIGS. 1 and 2 are denoted by the same
reference numerals, and in the following, differences will be mainly described.
[0039]
As shown in FIG. 5A, the heat sink 13c is formed with a first air inlet / outlet hole 22 (circular
hole) at the center of the inner bottom.
Further, as shown in FIGS. 5B and 5C, at least one inner leg protrusion 24 (five in FIGS. 5A and
5B) is provided on the inner leg 18a of the coupler 14a. ) Is formed. The inner leg projection 24
is joined to the inner bottom 18a of the heat sink 13c, whereby at least one notch 23 for air
inflow and outflow adjacent to the inner leg projection 24 (FIG. 5 (a) and 5) are formed in FIG.
[0040]
Further, at least one outer leg protrusion 25 (five in FIGS. 5A and 5B) is formed on the outer leg
19a of the coupler 14a. The outer leg projection 25 is joined to the first collar 16 of the heat sink
13c, whereby at least one notch 23 for air inflow and outflow adjacent to the outer leg projection
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25 (FIG. a) and 5 (b) are formed. Except the above-mentioned part, it has the same structure as
the speaker 1 by a 1st embodiment.
[0041]
In the loudspeaker 1c according to the fourth embodiment, the air in the space formed between
the heat sink 13c and the coupler 14a is transmitted through the first air inflow / outlet hole 22
of the heat sink 13c and the notch 23 of the coupler 14a. It becomes possible to flow into and
out of the space surrounded by the diaphragm 11, the damper 12 and the frame 9. As a result,
the air inside the bobbin 7 and the heat sink 13c whose temperature has risen due to the heat
generated by the voice coil 8 can be cooled, and a speaker having excellent heat dissipation
performance and high input resistance can be provided.
[0042]
The shapes and the numbers of the inner leg projections 24 and the outer leg projections 25 are
not limited to those of the present embodiment, and various modifications can be made without
departing from the scope of the present invention.
[0043]
Furthermore, in the present embodiment, the first air inflow / outflow hole 22 is a single circular
hole provided at the central portion of the heat sink 13c, but the shape and the number thereof
are not limited to this, and plural Various design changes are possible as needed, such as holes
other than circular holes.
[0044]
Fifth Embodiment A fifth embodiment is different from the fourth embodiment in the structure of
the magnetic circuit.
[0045]
FIG. 6 is a cross-sectional view of a loudspeaker 1d according to a fifth embodiment of the
present invention.
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In FIG. 6, the same components as in FIG. 5A are denoted by the same reference numerals, and in
the following, differences will be mainly described.
[0046]
As shown in FIG. 6, in the center pole 4 integrally formed in the central portion of the yoke 5a
constituting the magnetic circuit 6a and projecting upward, unlike in the fourth embodiment, air
flows into the central portion. There is no through hole for output.
Except for the above-mentioned part, it has the same structure as the speaker 1c according to the
fourth embodiment.
[0047]
As described above, in the loudspeaker 1d according to the fifth embodiment, since there is no
through hole at the central portion of the yoke 5a, the pressure of the air inside the bobbin 7
becomes high, and the air carrying heat around the heat sink 13c is the yoke 5a. The air does not
flow to the side, and instead, the air is rapidly transmitted to the space surrounded by the
diaphragm 11, the damper 12 and the frame 9 through the first air inlet / outlet 22 of the heat
sink 13c and the notch of the coupler 14a. It will flow.
As a result, the air inside the bobbin 7 can be cooled efficiently.
[0048]
In the speaker 1d of FIG. 6, since air does not flow from the heat sink 13c to the yoke 5a side, it
is conceivable that the temperature in the space surrounded by the diaphragm 11, the damper
12 and the frame 9 may rise depending on the case. Therefore, the bobbin 7 may be provided
with an air inlet / outlet hole so that the heat can be dissipated through the air inlet / outlet hole.
[0049]
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13
FIG. 7A is a cross-sectional view of the speaker 1e in which the air inflow / outflow hole 30 is
provided on the side surface of the bobbin 7a, and FIG. 7B is a plan view of the bobbin 7a.
[0050]
As shown in FIGS. 7 (a) and 7 (b), at least one air inlet / outlet hole 30 is formed on the side
surface of the bobbin 7a.
The configuration other than the bobbin 7a is the same as that of the speaker 1d of FIG.
[0051]
In the case of the speaker 1e of FIG. 7A, the heat-carrying air around the heat sink 13c flows not
only to the space surrounded by the diaphragm 11, the damper 12 and the frame 9, but also the
air inflow / outflow hole 30 of the bobbin 7a. It also flows to the outside through. As a result, the
problem that the temperature of the air in the space surrounded by the diaphragm 11, the
damper 12, and the frame 9 rises abnormally does not occur.
[0052]
In addition, the shape and number of the air inflow / outflow holes 30 of the bobbin 7a are not
limited to those of the present embodiment, and various changes can be made without departing
from the spirit of the present invention.
[0053]
Sixth Embodiment The sixth embodiment is different from the fourth embodiment in the
structure of the heat sink.
[0054]
FIG. 8 is a cross-sectional view of a loudspeaker 1f according to a sixth embodiment of the
present invention.
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In FIG. 8, the same components as in FIG. 5 are assigned the same reference numerals, and in the
following, differences will be mainly described.
[0055]
As shown in FIG. 8, the heat sink 13 d has a second flange 20 as in the speaker 1 a according to
the second embodiment.
Except for the above-mentioned part, it has the same structure as the speaker 1c according to the
fourth embodiment.
[0056]
The speaker 1 f according to the sixth embodiment can efficiently dissipate the heat generated by
the voice coil 8 and transmitted to the heat sink 13 c via the bobbin 7 by the second flange
portion 20, It is possible to provide a speaker having higher input resistance than the speaker 1c
according to the fourth embodiment.
[0057]
Seventh Embodiment The seventh embodiment is different from the first embodiment in the
structure of the coupler and the diaphragm.
[0058]
FIG. 9 is a cross-sectional view of a loudspeaker 1g according to a seventh embodiment of the
present invention.
In FIG. 9, the same components as in FIG. 1 are assigned the same reference numerals, and in the
following, differences will be mainly described.
[0059]
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15
As shown in FIG. 9, in the coupler 14a, at least one inner leg projection and at least one notch for
air flow in and out are formed in the inner leg similarly to the speaker 1c according to the fourth
embodiment. The outer leg is also formed with at least one outer leg projection and at least one
notch for air flow in and out.
Further, a second air inflow / outlet hole 26 (for example, a circular hole) is formed in the central
portion of the diaphragm 11a. Except the above-mentioned part, it has the same structure as the
speaker 1 by a 1st embodiment.
[0060]
In the loudspeaker 1g according to the seventh embodiment, the air in front of the diaphragm
11a is transmitted from the second air inflow / outlet hole 26 of the diaphragm 11a through the
notch 23 of the coupler 14a at the time of the amplitude before and after the diaphragm 11a.
Since it is possible to flow into and out of the space surrounded by the reference numeral 11 and
the damper 12, the heat sink 13 which is generated by the voice coil 8 and whose temperature
has risen can be efficiently cooled by the heat, It can provide high speakers.
[0061]
In the present embodiment, the second air inlet / outlet hole 26 is a single circular hole provided
at the center of the diaphragm 11a, but the shape and the number thereof are not limited to this.
Various design changes are possible as needed, such as a plurality of holes or holes other than
circular.
[0062]
In the speaker 1g of FIG. 9, the notch for air inflow and outflow is formed between the heat sink
13 and the coupler 14a, but the diaphragm 11a is formed via the notch and the second air inflow
and outflow hole 26. The air in the space enclosed by the damper 12 and the frame 9 may leak
to the front side of the diaphragm 11a, which may affect the sound quality.
Then, the structure which eliminated the notch part is also considered.
[0063]
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16
FIG. 10 is a cross-sectional view of the speaker 1 h having no notch between the heat sink 13
and the coupler 14.
The speaker 1 h of FIG. 10 has the heat sink 13 and the coupler 14 having the same structure as
that of FIG. 1, and the second air inflow / outflow hole 26 is formed in the central portion of the
diaphragm 11 a as in FIG. 9.
[0064]
In the speaker 1h of FIG. 10, since there is no notch between the heat sink 13 and the coupler
14a, air leakage can be suppressed, and even if the second air inlet / outlet hole 26 is formed, the
influence on the acoustic characteristics is reduced. .
[0065]
Eighth Embodiment In the eighth embodiment, the materials of the diaphragm and the coupler
are different from those of the first embodiment.
[0066]
FIG. 11 is a cross-sectional view of a loudspeaker 1i according to an eighth embodiment of the
present invention.
In FIG. 11, the same components as in FIG. 1 are denoted by the same reference numerals, and in
the following, differences will be mainly described.
[0067]
The diaphragm 11b and the coupler 14b of the speaker 1i shown in FIG. 11 are formed of a
material having high thermal conductivity, specifically, a metal such as aluminum, iron, or a zinc
alloy.
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Except the above-mentioned part, it has the same structure as the speaker 1 by a 1st
embodiment.
[0068]
The speaker 1i according to the eighth embodiment generates the heat generated by the voice
coil 8 and transmitted through the bobbin 7 including the outer surface of the coupler 14b as
well as the outer surfaces of the heat sink 13 and the diaphragm 11b. Since heat can be
dissipated efficiently, a speaker with high input resistance can be provided.
[0069]
The coupler 14b in the present embodiment may be formed of the same material as the heat sink
13 or may be formed of another material.
When the coupler 14 b and the heat sink 13 are formed of the same material, the coupler 14 b
and the heat sink 13 may be integrated. The front surface of the integrated structure (which
performs the same function as the heat sink) is joined to the rear surface of the diaphragm 11 b,
and the rear surface is joined to the front stage of the bobbin 7. By using such a structure, it is
not necessary to assemble the heat sink and the coupler separately, and the workability is
improved.
[0070]
(Other Embodiments) Although the representative embodiments of the present invention have
been described above, the present invention is not limited to only the structure of the abovedescribed embodiments, and various modifications can be made without departing from the spirit
of the present invention. Changes are possible.
[0071]
For example, the form which combined any one or some of 1st-8th embodiment is also possible.
Although all the magnetic circuits of the first to eighth embodiments are of the external magnet
type, any form can be replaced with the magnetic circuit of the internal magnet type. For
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example, the speaker 1j shown in FIG. 12 is obtained by replacing the external magnet type
magnetic circuit 6 of the speaker 1 according to the first embodiment with an internal magnet
type magnetic circuit 6b. The magnetic circuit 6b comprises a cylindrical magnet 2a, an annular
top plate 3a joined to the front of the magnet 2a, and a yoke 5b joined to the bottom of the
magnet 2a.
[0072]
Also, the coupler and the heat sink are not limited to only the structure of the above embodiment,
and various applications are possible. For example, with regard to the structure of the coupler, as
shown in FIG. 13A, the coupler 14c is constituted by the diaphragm receiving portion 17a and
the inner leg portion 18b, and the inner leg portion 18b is joined to the inner bottom portion 15
of the heat sink 13. The structure may be adopted. In this case, the outer leg is unnecessary.
[0073]
Alternatively, as shown in FIG. 13 (b), a structure in which the coupler 14 d is constituted by the
diaphragm receiving portion 17 a and the outer leg portion 19 and the outer leg portion 19 is
joined to the first flange portion 16 of the heat sink 13. May be adopted. In this case, the inner
leg is not necessary.
[0074]
Alternatively, as shown in FIG. 13C, the coupler 14e is constituted by the diaphragm receiving
portion 17a, the inner leg portion 18b and the outer leg portion 19 and the inner leg portion 18b
is formed on the inner bottom portion 15 of the heat sink 13. The structure in which the legs 19
are joined to the first collar 16 of the heat sink 13 may be employed.
[0075]
With regard to the method of joining the coupler and the heat sink, for example, as shown in FIG.
14 (a), the coupler 14f is composed of the diaphragm receiving portion 17a and the inner leg
portion 18c having a grooved hook formed at least in part. The heat sink 13c is composed of an
inner bottom portion 15a having a hole in the central portion and a first hook portion 16, and
the hook groove of the inner leg portion 18c is fitted into the inner peripheral portion of the
inner bottom portion 15a. You may employ ¦ adopt the structure which joins.
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[0076]
Alternatively, as shown in FIG. 14 (b), the coupler 14g is constituted by the diaphragm receiving
portion 17a and the outer leg portion 19b in which a grooved hook is formed at least in part, and
the heat sink 13 has the inner bottom portion 15 and the A structure in which the groove of the
hook of the outer leg portion 19 b is fitted into the outer peripheral edge portion of the first
collar portion 16 may be employed.
[0077]
BRIEF DESCRIPTION OF THE DRAWINGS Sectional drawing of the speaker 1 by the 1st
Embodiment of this invention.
FIG. 7 is a cross-sectional view showing the detailed structure of the heat sink 13 and the coupler
14;
(A) is sectional drawing of the speaker 1a by 2nd Embodiment of this invention, (b) is a top view
of the heat sink 13a which is a component of the speaker 1a.
(A) is sectional drawing of the speaker 1b by 3rd Embodiment of this invention, (b) is a top view
of the heat sink 13b which is a component of the speaker 1b. (A) is sectional drawing of the
speaker 1c by 4th Embodiment of this invention, (b) is a rear view of the coupler 14a which is a
component of the speaker 1c, (c) is a back perspective view of the coupler 14a. Sectional drawing
of the speaker 1d by the 5th Embodiment of this invention. (A) is sectional drawing of the
speaker 1e which provided the air inflow / outflow hole 30 in the side surface of the bobbin 7a,
(b) is a perspective view of the bobbin 7a. Sectional drawing of the speaker 1f by the 6th
Embodiment of this invention. Sectional drawing of the speaker 1g by 7th Embodiment of this
invention. Sectional drawing of the speaker 1h which does not have a notch part between the
heat sink 13 and the coupler 14. FIG. Sectional drawing of the speaker 1i by the 8th Embodiment
of this invention. Sectional drawing of the speaker 1j of internal magnet type. (A), (b) and (c) is
sectional drawing which shows the modification of a coupler. (A) And (b) is a figure which shows
the modification of the joining form of a coupler and a heat sink. Sectional drawing of the
conventional speaker 100. FIG.
Explanation of sign
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[0078]
DESCRIPTION OF SYMBOLS 1, 1a, 1b, 1c, 1d, 1e, 1f, 1g, 1i, 1j Speaker 2, 2a Magnet 3, 3a Top
plate 4, 4a Center pole 5, 5a, 5b Yoke (bottom yoke) 6, 6a, 6b Magnetic Circuit 7, 7a Bobbin 8
Voice Coil 9 Frame 10 Edge 11, 11a Diaphragm 12 Damper 13, 13a, 13b, 13c, 13d Heatsink 14,
14a, 14b, 14c, 14d, 14e, 14f, 14g Coupler 15, 15a Inner bottom portion 16 First ridge portion
17, 17a Diaphragm receiving portion 18, 18a, 18b, 18c Inner leg portion 19, 19a, 19b Outer leg
portion 20, 20a Second ridge portion 21 Irregular portion 22 First air inflow Outgoing hole 23
Notched portion 24 Inner leg protruding portion 25 Outer leg protruding portion 26 Second air
inlet / outlet hole 30 Air inlet / outlet hole
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