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JP2000152380

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DESCRIPTION JP2000152380
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
small-sized speaker for reproducing a large input acoustic signal, and more particularly to a
speaker characterized by a structure having a high heat dissipation effect.
[0002]
2. Description of the Related Art In recent years, small-sized, space-saving sound reproducing
devices have been used, and the speakers used for sound reproducing devices for such
applications are often small in diameter. FIG. 21 (a) is a cross-sectional view showing an example
of the structure of a conventional small aperture speaker, and FIG. 21 (b) is a perspective view
showing the structure of the central portion of the speaker. The speaker of such a structure is
demonstrated below.
[0003]
In the loudspeaker shown in FIGS. 21A and 21B, an annular magnetic circuit including a center
pole 202, an annular magnet 203, and an annular plate 204 is formed at the lower end of the
frame 201. An annular magnetic gap 205 formed by the upper outer peripheral portion of the
center pole 202 and the inner peripheral portion of the top plate 204 generates a high density of
magnetic flux, and the voice coil bobbin 206 is held so as to vibrate freely vertically. . The voice
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coil 210 is wound around the outer periphery of the lower end portion of the voice coil bobbin
206.
[0004]
The voice coil 210 generates an electromagnetic force to cause the voice coil bobbin 206 to
vibrate when a driving current is applied. A diaphragm 208 and a damper (also referred to as a
suspension) 207 are fixed to the voice coil bobbin 206 at an inner peripheral portion. The outer
peripheral portion of the diaphragm 208 is attached to the frame 201 so as to be vibrated via an
annular edge 209. The outer periphery of the damper 207 is fixed to the frame 201, and the
inner periphery of the damper 207 is held so as to be able to vibrate integrally with the voice coil
bobbin 206.
[0005]
In the speaker thus configured, when a drive current corresponding to the audio signal is applied
to the voice coil 210, a drive force is generated by the drive current and the magnetic flux of the
magnetic gap 205, and the voice coil bobbin 206 and the edge 209 are generated. The
diaphragm 208 held at the top and bottom vibrates up and down, and a sound is emitted.
[0006]
However, in the small speaker of the conventional structure shown in FIG. 21, since the aperture
of the diaphragm 208 is small, the input must be increased in order to obtain a predetermined
sound pressure.
In the case of a small speaker, the voice coil 210 to be driven is also small and the overall heat
capacity is also small. Therefore, when excessive drive power is inputted, the small voice coil 210
is heated by Joule heat and is broken. As described above, the conventional small-sized speaker
has a drawback that it is difficult to reproduce the sound with a large input.
[0007]
The present invention has been made in view of such conventional problems, and it is an object
of the present invention to provide a small speaker which enables large input by adding a heat
dissipation mechanism to a magnetic circuit and can obtain large reproduced sound. And
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[0008]
SUMMARY OF THE INVENTION In order to solve such problems, the invention according to claim
1 of the present application is an annular magnet formed in an annular shape, the upper and
lower annular surfaces being magnetized, and the annular magnet An annular plate fixed to the
upper annular surface of the magnetic disk and formed into a hollow disk shape of magnetic
metal, and a cylindrical portion and a disk portion are integrally formed using magnetic metal,
and the lower annular surface of the annular magnet is A disk portion is fixed, a center pole
whose outer peripheral surface of the cylindrical portion faces the inner peripheral surface of the
annular plate, a frame fixed to a part of the annular plate, and a voice coil bobbin around which a
voice coil is wound A damper having an outer peripheral portion fixed to the frame and an inner
peripheral portion fixed to the voice coil bobbin, and an outer peripheral portion fixed to the
frame via an edge A speaker having a diaphragm which is held movably and whose inner
peripheral portion is fixed to the voice coil bobbin and emits sound, the through hole opened in
the axial direction of the center pole and the lower end portion are the center A radiator made of
a metal having a thermal conductivity higher than that of the center pole, and a radiation fin
attached to a lower end of the radiator. It is further characterized in that it is provided.
[0009]
According to the invention of claim 2 of the present application, the annular magnet is formed in
an annular shape, the upper and lower annular surfaces are magnetized, and the upper annular
surface is fixed to the upper annular surface of the annular magnet. An annular plate and a
cylindrical portion and a disc portion are integrally formed using magnetic metal, the disc
portion is fixed to the lower annular surface of the annular magnet, and the outer peripheral
surface of the cylindrical portion is the inner periphery of the annular plate A center pole facing
the surface, a frame fixed to a part of the annular plate, a voice coil bobbin around which a voice
coil is wound, and an elastic member formed into a corrugated shape, the outer peripheral
portion being fixed to the frame A damper whose inner periphery is fixed to the voice coil
bobbin, and an outer periphery which is vibratably held by the frame via an edge, and an inner
periphery is fixed to the voice coil bobbin A speaker comprising a sound radiating plate, wherein
the through hole opened in the axial direction of the center pole and the lower end portion are
press-fit into the through hole so that the lower end portion protrudes below the disc portion of
the center pole; A radiator formed of metal having a thermal conductivity higher than that of the
center pole, and an upper end portion of the center pole is attached to a position facing the inner
peripheral surface of the voice coil bobbin, A heat collecting plate having a diameter and a
radiation fin attached to the lower end of the center pole are further provided.
[0010]
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According to the invention of claim 3 of the present application, the annular magnet is formed in
an annular shape, the upper and lower annular surfaces are magnetized, and the upper annular
surface is fixed to the upper annular surface of the annular magnet. An annular plate and a
cylindrical portion and a disc portion are integrally formed using magnetic metal, the disc
portion is fixed to the lower annular surface of the annular magnet, and the outer peripheral
surface of the cylindrical portion is the inner periphery of the annular plate A center pole facing
the surface, a frame fixed to a part of the annular plate, a voice coil bobbin around which a voice
coil is wound, and an elastic member formed into a corrugated shape, the outer peripheral
portion being fixed to the frame A damper whose inner periphery is fixed to the voice coil
bobbin, and an outer periphery which is vibratably held by the frame via an edge, and an inner
periphery is fixed to the voice coil bobbin A speaker including a diaphragm for emitting sound,
wherein the through hole opened in the axial direction of the center pole and the lower end
portion are press-fit into the through hole so that the lower end portion protrudes below the disk
portion of the center pole; A heat pipe in which a small amount of liquid is sealed at a critical
pressure in a metal pipe having a thermal conductivity higher than that of the center pole, and
the heat pipe at a position facing the inner peripheral surface of the voice coil bobbin at the
upper end of the center pole. A heat collecting plate mounted in contact with the upper portion
and having an outer diameter substantially the same as the outer diameter of the center pole and
a lower end of the heat pipe diffuses the heat conducted by the heat pipe into the air A radiation
fin is further provided.
[0011]
According to the invention of claim 4 of the present application, the annular magnet is formed in
an annular shape, the upper and lower annular surfaces are magnetized, and the upper annular
surface is fixed to the upper annular surface of the annular magnet. An annular plate and a
cylindrical portion and a disc portion are integrally formed using magnetic metal, the disc
portion is fixed to the lower annular surface of the annular magnet, and the outer peripheral
surface of the cylindrical portion is the inner periphery of the annular plate A center pole facing
the surface, a frame fixed to a part of the annular plate, a voice coil bobbin around which a voice
coil is wound, and an elastic member formed into a corrugated shape, the outer peripheral
portion being fixed to the frame A damper whose inner periphery is fixed to the voice coil
bobbin, and an outer periphery which is vibratably held by the frame via an edge, and an inner
periphery is fixed to the voice coil bobbin A speaker comprising: a diaphragm for emitting sound;
and a dome-shaped center cap fixed to a central portion of the diaphragm, the speaker
comprising: a through hole opened in the axial direction of the center pole; and the center cap A
radiator formed by using a metal having a heat conductivity higher than that of the center pole,
and a radiator having the above opening and the upper end portion pressed into the through
hole so as to project upward from the opening of the center cap; A radiation fin attached to the
upper end portion of the above is further provided.
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[0012]
The invention according to claim 5 of the present application is an annular magnet formed in an
annular shape, wherein the upper and lower annular surfaces are magnetized, and the upper
annular surface of the annular magnet is fixed and formed in a hollow disk shape with magnetic
metal. An annular plate and a cylindrical portion and a disc portion are integrally formed using
magnetic metal, the disc portion is fixed to the lower annular surface of the annular magnet, and
the outer peripheral surface of the cylindrical portion is the inner periphery of the annular plate
A center pole facing the surface, a frame fixed to a part of the annular plate, a voice coil bobbin
around which a voice coil is wound, and an elastic member formed into a corrugated shape, the
outer peripheral portion being fixed to the frame A damper whose inner periphery is fixed to the
voice coil bobbin, and an outer periphery which is vibratably held by the frame via an edge, and
an inner periphery is fixed to the voice coil bobbin A speaker comprising: a diaphragm for
emitting sound; and a dome-shaped center cap fixed to a central portion of the diaphragm, the
speaker comprising: a through hole opened in the axial direction of the center pole; and the
center cap Attached at a position facing the inner peripheral surface of the voice coil bobbin at
the upper end of the center pole, having an outer diameter substantially the same as the outer
diameter of the center pole, and the same inner diameter as the through hole An annular heat
collecting plate having an opening, and an upper end portion thereof is pressed into the through
hole of the center pole and the opening of the heat collecting plate so that the upper end
protrudes upward from the opening of the center cap, and the thermal conductivity from the
center pole A radiator formed in the shape of a cylinder using a high-temperature metal, and a
radiation fin attached to the upper end of the center pole. Than is.
[0013]
The invention according to claim 6 of the present application is an annular magnet formed in an
annular shape, the upper and lower annular surfaces being magnetized, and the upper annular
surface being fixed to the upper annular surface of the annular magnet and formed in a hollow
disk shape with magnetic metal. An annular plate and a cylindrical portion and a disc portion are
integrally formed using magnetic metal, the disc portion is fixed to the lower annular surface of
the annular magnet, and the outer peripheral surface of the cylindrical portion is the inner
periphery of the annular plate A center pole facing the surface, a frame fixed to a part of the
annular plate, a voice coil bobbin around which a voice coil is wound, and an elastic member
formed into a corrugated shape, the outer peripheral portion being fixed to the frame A damper
whose inner periphery is fixed to the voice coil bobbin, and an outer periphery which is
vibratably held by the frame via an edge, and an inner periphery is fixed to the voice coil bobbin
In a speaker comprising a diaphragm emitting a sound and a dome-shaped center cap fixed to a
central portion of the diaphragm, a non-through hole opened in the axial direction of the center
pole and the center cap The opening is attached to the upper end of the center pole at a position
facing the inner peripheral surface of the voice coil bobbin, has substantially the same diameter
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as the outer diameter of the center pole, and the same inner diameter as the non-through hole An
annular heat collecting plate having an opening, and a metal having a thermal conductivity
higher than that of the center cap, which is pressed into the non-through hole of the center pole
and the opening of the heat collecting plate so as to protrude above the center cap A heat pipe in
which a small amount of liquid is sealed at a critical pressure in a pipe made of plastic, and the
heat conducted to the heat pipe attached to the upper end of the heat pipe A radiation fin
diffuses into air, and is characterized in further providing the.
[0014]
The invention according to claim 7 of the present application is an annular magnet formed in an
annular shape, the upper and lower annular surfaces being magnetized, and the upper annular
surface being fixed to the upper annular surface of the annular magnet and formed in a hollow
disk shape with magnetic metal. An annular plate and a cylindrical portion and a disc portion are
integrally formed by using a magnetic metal, the disc portion is fixed to a lower annular surface
of the annular plate, and an outer peripheral surface of the cylindrical portion is an inner
periphery of the annular plate. A center pole facing the surface, a frame fixed above the annular
plate, a voice coil bobbin around which a voice coil is wound, and a corrugated elastic member,
the outer peripheral portion of which is fixed to the frame, A damper in which an inner
peripheral portion is fixed to the voice coil bobbin, and an outer peripheral portion is vibratably
held by the frame via an edge, and an inner peripheral portion is fixed to the voice coil bobbin A
speaker having a vibrating plate, wherein the frame is fixed to the upper annular surface of the
annular plate to fix the frame, and an opening having an inner diameter substantially the same as
the inner diameter of the annular plate is formed; A heat dissipation plate annularly formed of a
metal having high thermal conductivity is further provided.
[0015]
The invention according to claim 8 of the present application is an annular magnet formed in an
annular shape, the upper and lower annular surfaces being magnetized, and the upper annular
surface being fixed to the upper annular surface of the annular magnet and formed in a hollow
disk shape with magnetic metal. An annular plate and a cylindrical portion and a disc portion are
integrally formed by using a magnetic metal, the disc portion is fixed to a lower annular surface
of the annular plate, and an outer peripheral surface of the cylindrical portion is an inner
periphery of the annular plate. A center pole facing the surface, a frame fixed above the annular
plate, a voice coil bobbin around which a voice coil is wound, and a corrugated elastic member,
the outer peripheral portion of which is fixed to the frame, A damper in which an inner
peripheral portion is fixed to the voice coil bobbin, and an outer peripheral portion is vibratably
held by the frame via an edge, and an inner peripheral portion is fixed to the voice coil bobbin A
speaker having a vibration plate for emitting a metal, wherein an opening is fixed to the upper
annular surface of the annular plate and has an inner diameter substantially the same as the
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inner diameter of the annular plate, and a metal having a higher thermal conductivity than the
center pole And a cup-shaped heat dissipating plate for fixing the frame.
[0016]
The invention according to claim 9 of the present application is an annular magnet formed in an
annular shape, the upper and lower annular surfaces being magnetized, and the upper annular
surface being fixed to the upper annular surface of the annular magnet and formed in a hollow
disk shape with magnetic metal. An annular plate and a cylindrical portion and a disc portion are
integrally formed using magnetic metal, the disc portion is fixed to the lower annular surface of
the annular magnet, and the outer peripheral surface of the cylindrical portion is the inner
periphery of the annular plate A center pole facing the surface, a frame fixed to a part of the
annular plate, a voice coil bobbin around which a voice coil is wound, and an elastic member
formed into a corrugated shape, the outer peripheral portion being fixed to the frame A damper
whose inner periphery is fixed to the voice coil bobbin, and an outer periphery which is
vibratably held by the frame via an edge, and an inner periphery is fixed to the voice coil bobbin
A speaker comprising: a diaphragm for emitting sound, wherein a pipe hole penetrated along the
radial direction from the outer peripheral portion to the inner peripheral portion of the annular
plate, and the pipe hole of the annular plate are press-fit, The pipe is formed of a metal pipe
having a thermal conductivity higher than that of the pole, one end of the pipe is opposed to the
voice coil bobbin via an air gap, the middle part of the pipe is bent into an L shape, And a
radiation fin attached to the other end of the heat pipe for diffusing the heat conducted by the
heat pipe into the air. .
[0017]
The invention according to claim 10 of the present application is an annular magnet formed in an
annular shape, the upper and lower annular surfaces being magnetized, and the upper annular
surface being fixed to the upper annular surface of the annular magnet and formed in a hollow
disc shape with magnetic metal. An annular plate and a cylindrical portion and a disc portion are
integrally formed using magnetic metal, the disc portion is fixed to the lower annular surface of
the annular magnet, and the outer peripheral surface of the cylindrical portion is the inner
periphery of the annular plate A center pole facing the surface, a frame fixed to a part of the
annular plate, a voice coil bobbin around which a voice coil is wound, and an elastic member
formed into a corrugated shape, the outer peripheral portion being fixed to the frame A damper
whose inner periphery is fixed to the voice coil bobbin, and an outer periphery which is
vibratably held by the frame via an edge, and an inner periphery is fixed to the voice coil bobbin
A speaker having a diaphragm that radiates sound, and a pipe groove radially formed from an
outer peripheral portion to an inner peripheral portion in an upper annular surface of the
annular plate, and a thermal conductivity higher than that of the center pole The pipe is formed
of a metal, one end of the pipe is opposed to the voice coil bobbin via a gap, the middle part of
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the pipe is bent in an L shape, and a small amount of liquid is sealed in the pipe by a critical
pressure, A heat pipe inserted into the pipe groove of the annular plate, and a radiation fin
attached to the other end of the heat pipe for diffusing the heat conducted by the heat pipe into
the air are further provided. It is a thing.
[0018]
The invention according to claim 11 of the present application is an annular magnet formed in an
annular shape, the upper and lower annular surfaces being magnetized, and the upper annular
surface of the annular magnet being fixed and formed into a hollow disc shape with magnetic
metal. An annular plate and a cylindrical portion and a disc portion are integrally formed using
magnetic metal, the disc portion is fixed to the lower annular surface of the annular magnet, and
the outer peripheral surface of the cylindrical portion is the inner periphery of the annular plate
A center pole facing the surface, a frame fixed above the annular plate, a voice coil bobbin
around which a voice coil is wound, and a corrugated elastic member, the outer peripheral
portion of which is fixed to the frame, A damper in which an inner peripheral portion is fixed to
the voice coil bobbin, and an outer peripheral portion is vibratably held by the frame via an edge,
and an inner peripheral portion is fixed to the voice coil bobbin A speaker provided with a
diaphragm for emitting an electric sound, the pipe hole penetrating along the radial direction
from the outer peripheral portion to the inner peripheral portion of the annular plate, and fixed
to the upper annular surface of the annular plate; It is formed of an annular heat insulating
material for fixing the frame on the upper surface, and a metal pipe having a thermal
conductivity higher than that of the center pole, one end of the pipe faces the voice coil bobbin
via a gap, and the middle part of the pipe Are bent in an L-shape, the other end of the pipe is
attached to the outer peripheral part of the frame, a small amount of liquid is sealed in the pipe
at critical pressure, and the heat pipe is pressed into the pipe hole of the annular plate; Are
further provided.
[0019]
The invention according to claim 12 of the present application is an annular magnet formed in an
annular shape, the upper and lower annular surfaces being magnetized, and the upper annular
surface being fixed to the upper annular surface of the annular magnet and formed in a hollow
disk shape with magnetic metal. An annular plate and a cylindrical portion and a disc portion are
integrally formed using magnetic metal, the disc portion is fixed to the lower annular surface of
the annular magnet, and the outer peripheral surface of the cylindrical portion is the inner
periphery of the annular plate A center pole facing the surface, a frame fixed to the upper
annular surface of the annular plate, a voice coil bobbin around which a voice coil is wound, and
a corrugated elastic member, the outer peripheral portion being fixed to the frame A damper
having an inner peripheral portion fixed to the voice coil bobbin, an outer peripheral portion is
vibratably held by the frame via an edge, and an inner peripheral portion to the voice coil bobbin
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A speaker comprising: a diaphragm that is worn and emits sound; and a pipe hole penetrated
along the radial direction from the outer peripheral portion to the inner peripheral portion of the
annular plate; Is formed of an annular heat-insulated ring to which is fixed and a metal pipe
having a thermal conductivity higher than that of the center pole, one end of the pipe faces the
voice coil bobbin via a gap, and the middle part of the pipe is L-shaped And the other end of the
pipe is attached to the upper surface of the heat insulating ring, and a small amount of liquid is
sealed in the pipe at a critical pressure, and a heat pipe press-fitted into the pipe hole of the
annular plate is further provided. It is characterized by
[0020]
According to the invention of claim 13 of the present application, the annular magnet is formed
in an annular shape, the upper and lower annular surfaces are magnetized, and the upper
annular surface is fixed to the upper annular surface of the annular magnet. An annular plate and
a cylindrical portion and a disc portion are integrally formed using magnetic metal, the disc
portion is fixed to the lower annular surface of the annular magnet, and the outer peripheral
surface of the cylindrical portion is the inner periphery of the annular plate A center pole facing
the surface, a frame fixed to the upper annular surface of the annular plate, a voice coil bobbin
around which a voice coil is wound, and a corrugated elastic member, the outer peripheral
portion being fixed to the frame A damper having an inner peripheral portion fixed to the voice
coil bobbin, an outer peripheral portion is vibratably held by the frame via an edge, and an inner
peripheral portion to the voice coil bobbin In a speaker including a diaphragm that is worn and
emits sound, a pipe hole penetrated along the radial direction from the outer peripheral portion
to the inner peripheral portion of the annular plate, and a lower surface at the outermost
peripheral portion of the frame It is formed of a fixed annular heat insulating ring and a metal
pipe having a thermal conductivity higher than that of the center pole, one end of the pipe faces
the voice coil bobbin via an air gap, and the middle part of the pipe is L-shaped A heat pipe, the
other end of the pipe is attached to the upper surface of the heat insulation ring, a small amount
of liquid is sealed in the pipe at a critical pressure, and the heat pipe is pressed into the pipe hole
of the annular plate; An annular radiation fin attached to the other end and formed in an annular
shape using a metal having a thermal conductivity higher than that of the center pole. A.
[0021]
According to the invention of claim 14 of the present application, the annular magnet is formed
in an annular shape, the upper and lower annular surfaces are magnetized, and the upper
annular surface is fixed to the upper annular surface of the annular magnet. An annular plate and
a cylindrical portion and a disc portion are integrally formed using magnetic metal, the disc
portion is fixed to the lower annular surface of the annular magnet, and the outer peripheral
surface of the cylindrical portion is the inner periphery of the annular plate A center pole facing
the surface, a frame fixed to a part of the annular plate, a voice coil bobbin around which a voice
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coil is wound, and an elastic member formed into a corrugated shape, the outer peripheral
portion being fixed to the frame A damper whose inner periphery is fixed to the voice coil
bobbin, and an outer periphery which is vibratably held by the frame via an edge, and an inner
periphery is fixed to the voice coil bobbin A speaker having a diaphragm that radiates sound, the
pipe hole axially penetrating along the inner periphery of the annular plate, and the disk portion
of the center pole, the pipe of the annular plate A center pole hole formed at the same radial
position as the hole, an insulation ring inserted in the center pole hole, a metal pipe having a
thermal conductivity higher than that of the center pole, and one end of the pipe being the voice
The other end of the pipe is attached to face the outer peripheral surface of the coil bobbin so
that the other end of the pipe protrudes below the center pole, and a small amount of liquid is
sealed in the pipe at the critical pressure, the pipe hole of the annular plate and the heat
insulating ring A heat pipe press-fit into a hole and the other end of the heat pipe are diffused to
diffuse the heat conducted by the heat pipe into the air And radiating fins, and is characterized in
further providing the.
[0022]
The invention according to claim 15 of the present application is an annular magnet formed in an
annular shape, wherein the upper and lower annular surfaces are magnetized and the upper
annular surface of the annular magnet is fixed and formed in a hollow disk shape with magnetic
metal. An annular plate and a cylindrical portion and a disc portion are integrally formed using
magnetic metal, the disc portion is fixed to the lower annular surface of the annular magnet, and
the outer peripheral surface of the cylindrical portion is the inner periphery of the annular plate
A center pole facing the surface, a frame fixed to a part of the annular plate, a voice coil bobbin
around which a voice coil is wound, and an elastic member formed into a corrugated shape, the
outer peripheral portion being fixed to the frame A damper whose inner periphery is fixed to the
voice coil bobbin, and an outer periphery which is vibratably held by the frame via an edge, and
an inner periphery is fixed to the voice coil bobbin A speaker having a diaphragm for emitting a
sound, wherein the pipe hole axially penetrated along the inner peripheral portion of the annular
plate, the damper hole penetrated by the damper, and the damper hole The diaphragm hole is
provided at a radial position and is formed of a diaphragm hole penetrating the diaphragm and a
metal pipe having a thermal conductivity higher than that of the center pole, and one end of the
pipe faces the outer peripheral surface of the voice coil bobbin The other end of the pipe is
attached to project forward of the diaphragm via the damper hole and the diaphragm hole, and a
small amount of liquid is sealed in the pipe at a critical pressure, and the pipe hole of the annular
plate is inserted. It is further characterized in that it is further provided with a press-in heat pipe
and a radiation fin attached to the other end of the heat pipe for diffusing the heat conducted by
the heat pipe into the air. It is an.
[0023]
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The invention according to claim 16 of the present application is an annular magnet formed in an
annular shape, wherein the upper and lower annular surfaces are magnetized and the upper
annular surface is fixed to the upper annular surface of the annular magnet and formed in a
hollow disk shape with magnetic metal. An annular plate and a cylindrical portion and a disc
portion are integrally formed using magnetic metal, the disc portion is fixed to the lower annular
surface of the annular magnet, and the outer peripheral surface of the cylindrical portion is the
inner periphery of the annular plate A center pole facing the surface, a frame fixed to a part of
the annular plate, a voice coil bobbin around which a voice coil is wound, and an elastic member
formed into a corrugated shape, the outer peripheral portion being fixed to the frame A damper
whose inner periphery is fixed to the voice coil bobbin, and an outer periphery which is
vibratably held by the frame via an edge, and an inner periphery is fixed to the voice coil bobbin
A speaker having a diaphragm for emitting sound, and an annular pipe groove formed in parallel
to the disc portion along the outer surface of the cylindrical portion of the annular plate, and the
outer surface of the cylindrical portion of the annular plate It is formed by a pipe guide groove
formed in the axial direction along with a metal pipe having a thermal conductivity higher than
that of the center pole, and is bent in an annular shape so that the upper part of the pipe fits with
the annular pipe groove of the annular plate. And the other end of the pipe is attached so as to
protrude below the center pole, and a small amount of liquid is sealed in the pipe at a critical
pressure and inserted into the pipe groove of the annular plate and the hype groove of the
annular plate And a radiation fin attached to the other end of the heat pipe for diffusing the heat
conducted by the heat pipe into the air. It is an.
[0024]
The invention according to claim 17 of the present application is an annular magnet formed in an
annular shape, wherein the upper and lower annular surfaces are magnetized, and the upper
annular surface of the annular magnet is fixed and formed in a hollow disk shape with magnetic
metal. An annular plate and a cylindrical portion and a disc portion are integrally formed using
magnetic metal, the disc portion is fixed to the lower annular surface of the annular magnet, and
the outer peripheral surface of the cylindrical portion is the inner periphery of the annular plate
A center pole facing the surface, a frame fixed to a part of the annular plate, a voice coil bobbin
around which a voice coil is wound, and an elastic member formed into a corrugated shape, the
outer peripheral portion being fixed to the frame A damper whose inner periphery is fixed to the
voice coil bobbin, and an outer periphery which is vibratably held by the frame via an edge, and
an inner periphery is fixed to the voice coil bobbin In a speaker comprising: a diaphragm that
radiates sound; and a dome-shaped center cap fixed to a central portion of the diaphragm, an
opening provided in the center cap, and a thermal conductivity more than that of the center pole
It is formed of a high metal pipe, and the lower portion of the pipe is bent in an annular shape so
as to abut on the upper surface of the cylindrical portion of the center pole, and the upper
portion of the pipe protrudes to the front of the diaphragm through the opening of the center
cap. A heat pipe mounted so that the pipe encloses a small amount of liquid at a critical pressure,
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and a radiation fin attached to the upper end of the heat pipe for diffusing the heat conducted by
the heat pipe into the air; Are further provided.
[0025]
The invention according to claim 18 of the present application is an annular magnet formed in an
annular shape, wherein the upper and lower annular surfaces are magnetized and the upper
annular surface of the annular magnet is fixed and formed in a hollow disk shape with magnetic
metal. An annular plate and a cylindrical portion and a disc portion are integrally formed using
magnetic metal, the disc portion is fixed to the lower annular surface of the annular magnet, and
the outer peripheral surface of the cylindrical portion is the inner periphery of the annular plate
A center pole facing the surface, a frame fixed to a part of the annular plate, a voice coil bobbin
around which a voice coil is wound, and an elastic member formed into a corrugated shape, the
outer peripheral portion being fixed to the frame A damper whose inner periphery is fixed to the
voice coil bobbin, and an outer periphery which is vibratably held by the frame via an edge, and
an inner periphery is fixed to the voice coil bobbin An inner peripheral pipe groove formed along
an inner peripheral portion of the center pole, in a speaker including: a diaphragm that radiates
sound; and a dome-shaped center cap fixed to a central portion of the diaphragm; An opening
provided in the center cap and a metal pipe having a thermal conductivity higher than that of the
center pole, and a small amount of liquid is sealed in the pipe at a critical pressure, and the lower
portion of the pipe is the center pole A heat pipe which is bent in an annular shape so as to fit in
an inner peripheral pipe groove, and attached to a heat pipe so that the upper part of the pipe
protrudes forward of the diaphragm through the opening of the center cap; A radiation fin is
further provided, which is attached and which diffuses the heat conducted by the heat pipe into
the air.
[0026]
DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) A loudspeaker according
to a first embodiment of the present invention will be described with reference to the drawings,
focusing on the structure of a magnetic circuit.
In the drawings of the respective embodiments, the same parts as those in the conventional
example are given the same names, and the detailed description is omitted.
FIG. 1 is a cross-sectional view showing the structure of the loudspeaker according to the first
embodiment.
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12
As shown in the drawing, the annular magnet 20 is an annular magnet in which an upper annular
surface parallel to each other and a lower annular surface are magnetized.
In the following description, the positional relationship of components is described with the
upper part as the radiation direction of the sound of the speaker.
The annular plate 21 is formed of a magnetic metal such as iron in a hollow disk shape, and is
fixed to the upper annular surface of the annular magnet 20.
The center pole 22 is formed by integrally forming a cylindrical portion and a disk portion using
magnetic metal, and the disk portion is fixed to the lower annular surface of the annular magnet
20, and the upper outer peripheral surface of the cylindrical portion And the inner
circumferential surface of the annular plate 21.
A through hole 24 is provided at the center of the center pole 22, and a cylindrical radiator 25
made of copper or aluminum having a thermal conductivity higher than that of the material of
the center pole 22 is press-fitted into the through hole 24.
At the lower end portion of the radiator 25, a disk-shaped radiation fin 26 is fixed in order to
enhance the heat radiation effect.
[0027]
The heat dissipating fins 26 may be attached with a plurality of fins spaced at a constant distance
in order to enhance the heat dissipating effect.
The lower end of the center pole 22 extends in a disk shape and is fixed to the lower end of the
annular magnet 20 as a bottom plate of the magnetic circuit.
In the magnetic air gap 23, a voice coil 28 wound around a cylindrical voice coil bobbin 27 is
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disposed.
The voice coil bobbin 27 is supported by the damper 29 and the edge 31 fixed to the outer
peripheral portion of the diaphragm 30 so as to be capable of piston movement.
The outer peripheral portion of the damper 29 and the edge 31 is fixed to a frame 32 disposed
on the annular plate 21.
[0028]
The operation of the speaker having such a structure will be described.
When a driving current flows through the voice coil 28, a driving force is generated by the
electromagnetic force, and the diaphragm 30 vibrates to generate a sound.
The voice coil 28 is made of a copper wire or an aluminum wire, and its resistance component
generates Joule heat.
A portion of the generated heat is dissipated directly from the magnetic air gap 23, but most of it
is transferred to the center pole 22 and the annular plate 21 through the air in the magnetic air
gap 23.
The amount of heat radiated is determined by the heat capacity of the magnetic circuit and the
heat radiation area (strictly speaking, the heat receiving area).
Although the temperature rise of the voice coil 28 can be suppressed as the heat radiation area is
larger, it is difficult to increase the heat radiation amount in the conventional structure because
the diameter of the speaker is small.
[0029]
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14
However, in the loudspeaker according to the present embodiment shown in FIG. 1, since the
radiator 25 is disposed at the center of the center pole 22, the heat transmitted from the voice
coil 28 to the center pole 22 dissipates heat from the center pole 22 itself. And the lower end of
the magnetic circuit.
Since the radiator 25 is made of a metal having a high thermal conductivity such as copper or
aluminum, the amount of heat transfer is increased compared to a center pole made of iron
alone.
For example, assuming that the outer diameter of the center pole 22 is 19φ (mm) and the
diameter of the radiator 25 is 8φ, the cross-sectional area of the radiator 25 is about one fourth
of the cross-sectional area of the center pole 22 The conductivity of copper is 386 (w / mK °)
and aluminum 228 (w / mK °), which is substantially 6 to 4 times larger than that of iron (60 (w
/ mK °)). For this reason, the amount of heat transfer passing through the cylindrical cross
section of the radiator 25 is equal to or greater than that of the 19 ° center pole 22. The heat
from the voice coil 28 is released from the center pole 22, transmitted to the lower end of the
magnetic circuit through the radiator 25, and released to the air behind the speaker through the
radiation fin 26 fixed to the radiator 25. Therefore, the temperature rise of the voice coil 28 is
reduced, and the voice coil 28 can be driven with higher power than the conventional one.
[0030]
Second Embodiment Next, a loudspeaker according to a second embodiment of the present
invention will be described with reference to the drawings. FIG. 2 is a cross-sectional view
showing the structure of the loudspeaker according to the second embodiment. The same
reference numerals as in the first embodiment denote the same parts in FIG. In the speaker of the
present embodiment, in addition to the structure of the first embodiment, a cylindrical heat
collecting plate 33 is attached so as to extend the center pole 22 upward, and is connected to the
upper portion of the radiator 25. The heat collecting plate 33 is a position facing the inner
peripheral surface of the voice coil bobbin 27 and is attached to the upper end of the center pole
22 and has an outer diameter substantially the same as the outer diameter of the cylindrical
portion of the center pole 22 And a metal having a thermal conductivity higher than that of the
material of the center pole 22 such as aluminum.
[0031]
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In the speaker of the second embodiment, more heat can be transmitted to the radiator 25 side
from the vicinity of the voice coil 28 through the heat collecting plate 33, so the heat radiation
effect is further enhanced.
[0032]
Third Embodiment Next, a loudspeaker according to a third embodiment of the present invention
will be described with reference to the drawings.
FIG. 3 is a cross-sectional view showing the structure of the loudspeaker according to the third
embodiment. The same parts as those of the loudspeaker according to the first or second
embodiment carry the same reference numerals for which detailed descriptions are to be
omitted. The center pole 22 constituting the magnetic circuit is provided with a through hole 24
along the central axis. A disk-like heat collecting plate 33 is attached to extend the center pole 22
upward. The heat pipe 34 is inserted into the through hole 24. The heat pipe 34 is a metal pipe
made of copper or aluminum and sealed with a small amount of liquid at a critical pressure, and
utilizing the heat of vaporization accompanying the change in state of the liquid and the
movement of the vaporized gas, It conducts heat quickly and efficiently. The upper end of the
heat pipe 34 is in contact with the heat collecting plate 33. At the lower end of the heat pipe 34,
a radiation fin 35 made of thin aluminum or copper is attached. The heat collecting plate 33 is
attached to the upper end portion of the center pole 22 at a position facing the inner peripheral
surface of the voice coil bobbin 27 so as to be in contact with the upper portion of the heat pipe
34. It has the same outer diameter.
[0033]
The heat pipe 34 transfers heat using vaporization condensation of the liquid sealed inside, so
the amount of heat transfer is about 20 times larger than that of a copper rod of the same
diameter. For example, the heat transfer amount of the heat pipe of φ3 corresponds to a copper
rod of φ20 and corresponds to an iron rod of φ45. Therefore, when the heat pipe of φ3 is
used, heat corresponding to the center pole of φ45 can be conducted. Normally, for small
speakers with a diameter of 5 cm or 8 cm, 16 が or 19 の center poles are used. However, if a
heat pipe is embedded in these center poles, the heat dissipation effect becomes extremely high.
By using the heat pipe 34 in this manner, more heat can be transferred. For this reason, the
amount of heat radiation further increases, and the temperature rise of the voice coil 28 can be
further reduced.
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[0034]
(Fourth Embodiment) In the speakers shown in the first to third embodiments, the radiator is
provided in the lower end direction of the magnetic circuit, but the radiator may be provided in
front of the diaphragm.
[0035]
In the loudspeaker according to the fourth embodiment shown in FIG. 4, the annular magnet 20,
the annular plate 21, the center pole 22, the voice coil bobbin 27, the damper 29, and a part of
the annular plate 21 are fixed as in the loudspeaker according to the first embodiment. A frame
32 is provided.
The diaphragm 31 is formed in a conical shape, the outer peripheral portion is vibratably held by
the frame 32 via the edge 31, the inner peripheral portion is fixed to the voice coil bobbin 27,
and the piston motion of the voice coil bobbin 27 vibrates. Emit The center cap 36 is a domeshaped cap fixed to the center of the diaphragm 30.
[0036]
In the present embodiment, the opening 37 is provided at the center of the center cap 36. Next, a
radiator 25 formed in a cylindrical shape using a metal having a high thermal conductivity is
prepared. Then, the radiator 25 is press-fit into the through hole 24 so that the upper end
portion of the radiator 25 protrudes upward from the opening 37 of the center cap 36. Then, the
radiation fin 26 is attached to the upper end portion of the radiator 25.
[0037]
(Fifth Embodiment) In the loudspeaker according to the fifth embodiment shown in FIG. 5, the
annular magnet 20, annular plate 21, center pole 22, voice coil bobbin 27, damper 29, annular
plate 21 as in the loudspeaker of the first embodiment. And a frame 32 fixed to a part of the
frame. The diaphragm 30 is formed in a conical shape, the outer peripheral portion is vibratably
held by the frame 32 via the edge 31, the inner peripheral portion is fixed to the voice coil
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bobbin 27, and the piston motion of the voice coil bobbin 27 vibrates. Emit The center cap 36 is
a dome-shaped cap fixed to the center of the diaphragm 30.
[0038]
In the present embodiment, the opening 37 is provided at the center of the center cap 36. A heat
collecting plate 33 is attached to the upper end portion of the center pole 22 at a position facing
the inner peripheral surface of the voice coil bobbin 27. The heat collecting plate 33 has an outer
diameter substantially the same as the outer diameter of the center pole 22 and is provided with
an opening having the same inner diameter as the through hole 24. Then, the radiator 25 is
press-fit into the through hole 24 of the center pole 22 and the opening of the heat collecting
plate 33. The radiator 25 is formed in a cylindrical shape using a metal having high thermal
conductivity so that the upper end projects upward from the opening 37 of the center cap 36.
Then, the radiation fin 26 is attached to the upper end portion of the radiator 25.
[0039]
Sixth Embodiment The loudspeaker according to the sixth embodiment shown in FIG. 6 has the
annular magnet 20, the annular plate 21, the center pole 22, the voice coil bobbin 27, the
damper 29, and the annular plate 21 as in the loudspeaker according to the first embodiment.
And a frame 32 fixed to a part of the frame. The diaphragm 30 is formed in a conical shape, the
outer peripheral portion is vibratably held by the frame 32 via the edge 31, the inner peripheral
portion is fixed to the voice coil bobbin 27, and the piston motion of the voice coil bobbin 27
vibrates. Emit The center cap 36 is a dome-shaped cap fixed to the center of the diaphragm 30.
[0040]
Also in the present embodiment, the opening 37 is provided at the center of the center cap 36,
and the non-through hole 24a is provided at the central axis of the center pole 22. A heat
collecting plate 33 is attached to the upper end portion of the center pole 22 at a position facing
the inner peripheral surface of the voice coil bobbin 27. The heat collecting plate 33 is an
annular heat collecting plate having an outer diameter substantially the same as the outer
diameter of the center pole 22 and an opening having the same inner diameter as the nonthrough hole 24 a. The heat pipe 34 is press-fit into the non-through hole 24 a of the center pole
22 and the opening of the heat collecting plate 33. The heat pipe 34 is a hollow pipe formed of a
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metal having a high thermal conductivity so as to protrude above the center cap 36 and a small
amount of liquid is sealed at a critical pressure. Then, the radiation fin 35 is attached to the
upper end portion of the heat pipe 34.
[0041]
Even with such a structure, the same effect as that shown in FIGS. 1 to 3 can be obtained. This is
particularly effective when the space behind the speaker is limited.
[0042]
Seventh Embodiment Next, a loudspeaker according to a seventh embodiment of the present
invention will be described with reference to the drawings. FIG. 7 is a cross-sectional view
showing the structure of the loudspeaker according to the seventh embodiment. As shown in the
drawing, the annular plate 21 is fixed to the upper portion of the annular magnet 20, and a
magnetic gap 23 is formed between the center pole 53 and the cylindrical portion. An annular
heat dissipating plate 52 having an opening 51 substantially equal to the inner diameter of the
annular plate 21 is mounted on the annular plate 21.
[0043]
The annular heat dissipating plate 52 is a heat dissipating plate fixed to the upper annular
surface of the annular plate 21 for fixing the frame 32 and having an opening 51 having the
same inner diameter as the inner diameter of the annular plate 21. In order to effectively collect
and release the heat of the voice coil 28, the annular heat dissipating plate 52 is annularly
formed of a metal having a high thermal conductivity, and the surface is colored black. The outer
periphery of the annular heat dissipation plate 52 is larger than the outer periphery of the
annular plate 21. A center pole 53 is disposed on an inner peripheral portion of the annular plate
21 with a voice coil bobbin 27 around which the voice coil 28 is wound. The center pole 53 is a
magnetic metal in which a cylindrical portion and a disk portion are integrally formed.
[0044]
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The disk portion of the center pole 53 is fixed to the lower end portion of the annular magnet 20
as a bottom plate of the magnetic circuit. The voice coil bobbin 27 is vibratably held by the
damper 29 and an edge 31 fixed to the outer peripheral portion of the diaphragm 30. The outer
peripheral portions of the damper 29 and the edge 31 are fixed to the frame 32.
[0045]
The operation of the speaker having such a structure will be described. When a driving current
flows through the voice coil 28, a driving force is generated by the electromagnetic force, and the
diaphragm 30 vibrates to generate a sound. The voice coil 28 is made of copper or aluminum
wire, and its resistance component generates Joule heat. A part of the generated heat is
dissipated directly from the magnetic gap 23 but most of it is transferred to the center pole 53
and the annular plate 21 through the air in the magnetic gap 23. The amount of heat is the heat
capacity and heat radiation area of the magnetic circuit. As the heat dissipation area is larger, the
temperature rise of the voice coil 28 is smaller. However, since the diameter of the speaker is
smaller, it is difficult to increase the heat dissipation in the normal structure.
[0046]
In the speaker of the present embodiment, the heat generated from the voice coil 28 is collected
by the annular heat dissipation plate 52 and conducted to the outer peripheral portion. Since the
annular heat dissipating plate 52 is made of a metal having a high thermal conductivity such as
copper or aluminum, the amount of heat transfer is increased as compared with the annular plate
21 made of iron alone. For example, when the thickness of the annular plate 21 is 4 mm and the
thickness of the annular heat dissipation plate 52 is 2 mm, the cross sectional area of the inner
diameter portion of the annular heat dissipation plate 52 is half the cross sectional area of the
inner diameter portion of the annular plate 21. However, the thermal conductivity is 386 (w /
mK °) for copper and 228 (w / mK °) for aluminum, as compared to 60 (w / mK °) for iron.
Thus, in the present embodiment, the thermal conductivity is six to four times greater, and the
actual amount of heat transfer is at least twice the amount of heat transfer of the annular plate
21. Furthermore, since the annular heat dissipating plate 52 is colored in black, the radiation
heat from the voice coil 28 can be well absorbed in addition to the heat conduction by air.
[0047]
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20
Further, since the outer shape of the annular heat dissipating plate 52 is larger than that of the
annular plate 21, the outer peripheral portion outside the annular plate 21 acts as a heat
dissipating fin, and the heat dissipating area is increased. Therefore, the heat of the voice coil 28
is dissipated efficiently. As described above, in addition to the amount of heat released from the
normal magnetic circuit, the amount of heat emitted from the voice coil 28 is increased by the
amount released to the outside through the annular heat dissipating plate 52. Therefore, the
temperature rise of the voice coil 28 is further suppressed.
[0048]
Further, as shown in FIG. 8, the annular heat dissipating plate 54 may be formed in a cup shape
along the outer periphery of the frame 32, and the frame 32 may also be used as a heat
dissipating fin. In this way, the outer shape of the speaker can be prevented from being enlarged
by the disk-shaped heat dissipation plate.
[0049]
Eighth Embodiment Next, a loudspeaker according to an eighth embodiment of the present
invention will be described with reference to the drawings. FIG. 9 is a cross-sectional view
showing the structure of the loudspeaker according to the eighth embodiment, and FIG. 10 is an
enlarged perspective view showing a magnetic circuit and a voice coil portion of the loudspeaker.
As shown in FIG. 10, an annular plate 65 is fixed to the upper portion of the annular magnet 20.
Further, as shown in FIG. 9, a magnetic air gap 23 is formed between the inner peripheral
portion of the annular plate 65 and the cylindrical portion of the center pole 22. In the annular
plate 65, a pipe hole 61 is opened in the radial direction from the outer circumference to the
inner circumference, and the heat pipe 62 having the heat conduction function described above
is press-fit into the pipe hole 61.
[0050]
As shown in FIG. 9, the other end of the heat pipe 62 is extended from the side of the frame 32 to
the front surface of the speaker, and the radiation fin 63 is attached to the end. On the other
hand, a center pole 53 is disposed on the inner peripheral portion of the annular plate 65, and a
magnetic gap 23 is formed. The disk portion of the center pole 53 is fixed to the lower end
portion of the annular magnet 20 as a bottom plate of the magnetic circuit. In the magnetic air
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gap 23, a voice coil 28 wound around a voice coil bobbin 27 is disposed. The voice coil bobbin
27 is vibratably held by the damper 29 and the edge 31 fixed to the outer peripheral portion of
the diaphragm 30. The outer peripheral portions of the dampers 29 and the edge 31 are fixed to
a frame 32 disposed on the annular plate 65.
[0051]
The heat pipe 62 conducts electricity utilizing evaporation condensation of the liquid sealed
inside, so the amount of heat transfer is about 20 times as large as that of a copper rod of the
same diameter. Since the heat release amount by the heat pipe 62 is increased, the temperature
rise of the voice coil 28 can be suppressed. Further, by disposing the radiation fin 63 in front of
the speaker, the interference of the fin due to the radiation from the magnetic circuit can be
prevented, and the radiation effect can be enhanced.
[0052]
In the speakers shown in FIGS. 9 and 10, the heat pipe is disposed by providing the pipe holes 61
in the radial direction of the annular plate 65. However, as shown in FIGS. 11 and 12, the pipe
groove 64 is formed in the annular plate 66. And the heat pipe 62 may be attached. Furthermore,
a similar pipe hole or pipe groove may be provided to the annular heat dissipating plate 52 fixed
on the annular plate 21 shown in FIG. 7, and the heat pipe 62 may be attached.
[0053]
Embodiment 9 A loudspeaker according to Embodiment 9 of the present invention will be
described with reference to the drawings. FIG. 13 is a cross-sectional view showing the structure
of the loudspeaker according to the ninth embodiment. As shown in the drawing, an annular
plate 65 is fixed to the upper portion of the annular magnet 20, and a magnetic gap 23 is formed
between the center pole 53 and the cylindrical portion. A pipe hole 61 is formed in the annular
plate 65 in the radial direction from the outer periphery to the inner periphery, and a heat pipe
62 is attached to the pipe hole 61 by press fitting. The disk portion located at the lower end of
the center pole 53 is fixed to the lower end of the annular magnet 20 as a bottom plate of the
magnetic circuit. In the magnetic air gap 23, a voice coil 28 wound around a voice coil bobbin 27
is disposed.
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[0054]
The voice coil bobbin 27 is vibratably held by the damper 29 and an edge 31 fixed to the outer
peripheral portion of the diaphragm 30. The outer peripheral portions of the damper 29 and the
edge 31 are fixed to the frame 32. A frame 32 is mounted on the annular plate 65 via a heat
insulating material 71. The heat insulating material 71 is an annular heat insulating material
fixed to the upper annular surface of the annular plate 65 and fixing the frame 32 on the upper
surface. The other end of the heat pipe 62 is extended and fixed to the side of the frame 32.
Since the frame 32 is fixed to the annular plate 65 via the heat insulating material 71, the heat of
the annular plate 65 is less likely to be transmitted to the frame 32.
[0055]
On the other hand, in the heat pipe 62, the annular plate 65 side functions as a heat collecting
end, and the frame 32 side functions as a heat radiating end. The frame 32 also works as a heat
dissipating fin of the heat pipe 62. The heat pipe 62 transfers heat using vaporization
condensation of the liquid sealed inside, so the amount of heat transfer is about 20 times larger
than that of a copper rod of the same diameter. For this reason, the amount of heat radiation
further increases, and the temperature rise of the voice coil 28 can be further reduced. Further,
by using the frame 32 as a heat dissipating fin, the heat dissipating fin 63 as shown in FIG. 9 can
be eliminated.
[0056]
Tenth Embodiment Next, a loudspeaker according to a tenth embodiment will be described with
reference to FIG. FIG. 14 is a cross-sectional view showing the structure of the loudspeaker
according to the tenth embodiment. As shown in the drawing, an annular plate 65 is fixed to the
upper portion of the annular magnet 20, and a magnetic gap 23 is formed between the center
pole 53 and the cylindrical portion. In the annular plate 65, a pipe hole 61 is opened in the radial
direction from the outer circumference to the inner circumference, and a heat pipe 62 is attached
to the pipe hole 61 by press-fitting. The other end of the heat pipe 62 is extended from the side
of the frame 32 to the front of the speaker, and an annular radiation fin 81 is attached to the
end. The annular radiation fin 81 is a radiation plate formed in an annular shape using a metal
with high thermal conductivity. The annular radiation fin 81 and the heat pipe end 82 are fixed
to the frame 32 via an annular heat insulating ring 83. A center pole 53 is disposed on the inner
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periphery of the annular plate 65, and a magnetic gap 23 is formed.
[0057]
The disk portion located at the lower end of the center pole 53 is fixed to the lower end of the
annular magnet 20 as a bottom plate of the magnetic circuit. In the magnetic air gap 23, a voice
coil 28 wound around a cylindrical voice coil bobbin 27 is disposed. The voice coil bobbin 27 is
vibratably held relative to the frame 32 by the damper 29 and the edge 31 fixed to the outer
peripheral portion of the diaphragm 30. The outer peripheral portions of the dampers 29 and the
edge 31 are fixed to a frame 32 disposed on the annular heat dissipation plate 52.
[0058]
The heat pipe 62 conducts heat using evaporation condensation of the liquid sealed inside, so the
amount of heat transfer is about 20 times as large as that of a copper rod of the same diameter.
For this reason, the amount of heat radiation further increases, and the temperature rise of the
voice coil 28 can be further reduced. Furthermore, by arranging the annular radiation fin 81 in
front of the speaker, interference of the fin due to heat radiation from the magnetic circuit can be
prevented, and the heat radiation effect can be enhanced. Further, since the annular radiation fin
81 is fixed to the frame 32 via the heat insulating ring 83, resonance of the annular radiation fin
81 can be prevented. Furthermore, it can be used as a car-mounted speaker even in a place
where vibration is large. In the speaker of the present embodiment, the heat pipe 62 is disposed
by providing the pipe hole 61 in the radial direction of the annular plate 65, but a pipe groove
may be provided.
[0059]
Eleventh Embodiment Next, a loudspeaker according to an eleventh embodiment of the present
invention will be described with reference to the drawings. FIG. 15 is a cross-sectional view
showing the speaker structure of Embodiment 11, and FIG. 16 is an enlarged perspective view of
a magnetic circuit and a voice coil portion. As shown in the figure, an annular plate 96 is fixed to
the upper portion of the annular magnet 20, and a magnetic gap 23 is formed between the
center pole 97 and the cylindrical portion. In the inner peripheral portion of the annular plate
96, a pipe hole 91 for disposing the heat pipe 94 is provided in parallel with the central axis of
the center pole 97. As shown in FIG. 16, the pipe hole 91 is opened substantially in contact with
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the inner peripheral portion of the annular plate 96.
[0060]
The disk portion located at the lower end of the center pole 97 is fixed to the lower end portion
of the annular magnet 20 as a bottom plate of the magnetic circuit. A center pole hole 92 is
provided parallel to the central axis of the center pole 97 on the opposite surface of the center
pole 97 across the annular plate 96 and the annular magnet 20. A cylindrical heat insulating ring
93 is inserted into the center pole hole 92. A heat pipe 94 is attached through the heat insulating
ring 93 to the pipe hole 91 of the annular plate 96. The central hole of the pipe hole 91 on the
annular plate 96 and the center pole hole 92 substantially coincide with each other so that the
heat pipe 94 can be inserted linearly.
[0061]
The lower end portion of the heat pipe 94 protrudes into the air behind the speaker, and a
radiation fin 95 is attached to the tip end portion thereof. In the magnetic air gap 23, a voice coil
28 wound around a voice coil bobbin 27 is disposed. The voice coil bobbin 27 is vibratably held
by the damper 29 and the edge 31 fixed to the outer peripheral portion of the diaphragm 30.
The outer peripheral portions of the dampers 29 and the edge 31 are fixed to a frame 32
disposed on the annular plate 96.
[0062]
In the speaker having such a configuration, the heat from the voice coil 28 is dissipated to the air
from the lower end of the center pole 22 through the heat pipe 94. The heat pipe 94 conducts
heat using evaporation condensation of the liquid sealed inside, so the amount of heat transfer is
about 20 times as large as that of a copper rod of the same diameter. Therefore, the amount of
heat radiation through the heat pipe 94 is increased, and the temperature rise of the voice coil
28 can be reduced.
[0063]
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25
In the present embodiment, the heat pipe 94 is disposed in the air behind the speaker from the
lower end of the magnetic circuit. However, as shown in FIG. 17, the heat may be radiated to the
space in front of the speaker by passing through the damper hole 102 provided in the damper
101 and the diaphragm hole 104 opened in the diaphragm 103. In this case, both the damper
hole 102 and the diaphragm hole 104 are made larger than the outer diameter of the heat pipe
105 so as not to contact each other.
[0064]
Embodiment 12 Next, a loudspeaker according to Embodiment 12 of the present invention will
be described with reference to the drawings. FIG. 18 is a perspective view showing an
appearance around a center pole used for a loudspeaker according to a twelfth embodiment. An
annular pipe groove 112 is cut along a cylindrical portion of the center pole 111 consisting of a
cylindrical portion and a disk portion, and a heat pipe 113 is annularly fixed to the annular pipe
groove 112. An annular pipe groove 112 is located near the lower end of the voice coil and
absorbs the heat of the voice coil. The depth of the annular pipe groove 112 is larger than the
diameter of the heat pipe 113, so that even if the heat pipe 113 is fixed, it does not contact the
voice coil. Furthermore, in the cylindrical portion of the center pole 111, a pipe guide groove 114
is provided in parallel with the central axis of the center pole 111 so as to be orthogonal to the
annular pipe groove 112. Further, a hole 115 communicating with the pipe guide groove 114 is
provided in the disk portion of the center pole 111. Then, the heat pipe 113 is extended from the
pipe guide groove 114 to the air under the magnetic circuit through the hole 115. At the end of
the heat pipe 113, a radiation fin 116 is attached. Even with such a configuration, the same effect
as that of the eleventh embodiment can be obtained.
[0065]
Thirteenth Embodiment A loudspeaker according to a thirteenth embodiment of the present
invention will now be described with reference to the drawings. FIG. 19 is an external perspective
view of the periphery of a center pole used for the loudspeaker of the thirteenth embodiment. A
heat pipe 122 whose end is annularly formed is attached to the upper end of the cylindrical
portion of the center pole 121 that faces the voice coil 28 and is formed of a cylindrical portion
and a disk portion. The other end of the heat pipe 122 extends through the opening provided at
the center of the center cap of the speaker to the air in front of the speaker. And the radiation fin
123 is attached to this other end part. Even with such a configuration, the same effect as that of
the eleventh embodiment can be obtained.
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26
[0066]
Fourteenth Embodiment A loudspeaker according to a fourteenth embodiment of the present
invention will now be described with reference to the drawings. FIG. 20 is a perspective view
showing the structure around the heat pipe and the magnetic circuit used for the speaker of the
fourteenth embodiment. An annular heat radiation plate 132 is fixed on the annular plate 131.
An inner circumferential hyppe groove 133 is provided along the inner circumference of the
inner circumferential portion of the annular heat dissipation plate 132. A heat pipe 134 having
an annular tip end portion is disposed in the inner peripheral pipe groove 133 and is opposed to
the voice coil 28 wound around the voice coil bobbin 27.
[0067]
The other end of the heat pipe 134 extends in the front air of the speaker through an opening
provided in the damper and an opening provided in the center cap as in the case shown in FIG. A
radiation fin 135 is attached to the other end. In addition, annular radiation plate 132 may be
omitted for simplicity, and it may arrange directly on annular plate 131.
[0068]
As described above, in the speakers of the twelfth, thirteenth, and fourteenth embodiments, the
heat collecting portion of the heat pipe is formed in an annular shape, so that the heat of the
voice coil can be absorbed more effectively. Therefore, the amount of heat transfer can be
increased, and the temperature rise of the voice coil can be reduced.
[0069]
As described above, in the present invention, much heat from the voice coil can be dissipated by
adding a heat pipe or a radiator to the speaker. Therefore, the temperature rise of the voice coil
can be suppressed low. Therefore, even if the drive input is increased, breakage of the voice coil
due to the temperature rise of the speaker can be prevented, and the reliability can be enhanced.
Furthermore, since the drive input can be increased, it is possible to realize a small speaker with
high clarity and high reproduction sound pressure.
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