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JP2018074472

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DESCRIPTION JP2018074472
Abstract: To provide a speaker capable of more effectively suppressing heat generation of a voice
coil even when a voice signal with a large output is input to the voice coil. A magnet 20, a
diaphragm 12 vibrating by the magnet 20, a yoke 22 provided on each of a pair of end faces of
the magnet, an air core coil, wherein the magnet 20 and the yoke 22 The voice coil 18
accommodated in the inner space of the air core coil so as to be capable of reciprocating along
the coil axis line so that the pair of end faces is orthogonal to the coil axis, and the surface of the
diaphragm 12 opposite to the voice coil 18 And a support rod 24 fixed to the magnet 20 at one
end and fixed to the diaphragm 12 at the other end to reciprocate the magnet 20 and the yoke
22 along the axial direction of the voice coil 18. A bottomed frame 16 for resiliently supporting
the diaphragm 12, and a heat sink 26 fixed to the bottom 16A of the frame 16 and having an
opening into which the voice coil 18 is inserted. It is over mosquitoes. [Selected figure] Figure 1
スピーカ
[0001]
The present invention relates to a speaker, and more particularly to a speaker capable of
effectively preventing overheating of a voice coil when a high-output audio signal is input.
[0002]
Conventionally, a moving coil type speaker in which a voice coil vibrates has generally been used
as a speaker.
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However, in the conventional speaker, there is a problem that the lead wire for inputting an
audio signal to the voice coil is easily broken because the voice coil vibrates.
[0003]
Therefore, a moving magnet type speaker has been developed in which a voice coil is fixed to a
frame and a magnet is vibrated.
[0004]
As such a speaker, for example, a diaphragm, a ring-shaped magnet attached to a hole at a
central portion of the diaphragm, a frame for elastically supporting the diaphragm, and a hollow
cylindrical shape provided at the central portion of the frame There is a speaker device having a
pole portion of the above, a heat sink attached to the pole portion and fixed to the frame, and a
drive coil fixed in a state of being inserted into the pole portion (Patent Document 1).
[0005]
In addition, it has a diaphragm provided so as to be movable with respect to the frame, a coil
fixed to the frame, and magnetic flux applying means for applying a magnetic flux to the coil, and
the diaphragm is In the speaker device driven in the axial direction, the magnetic flux applying
means may apply a magnetic flux substantially perpendicular to the coil axial direction to the
coil.
In this speaker device, the magnetic flux applying means includes a drive magnet fixed to the
diaphragm (Patent Document 2).
[0006]
Furthermore, the two voice coils are arranged at predetermined intervals in the vibration
direction and in opposite phases to each other, and the voice coils are connected in series and
fixed in the housing and arranged in the vibration direction. A magnet magnetized in the
thickness direction is movably disposed substantially in the middle of the voice coil, and the
magnetic pole of the voice coil is changed in accordance with the flow direction of the voice
current flowing through each voice coil. There is a speaker comprising an exciter configured to
move in a voice coil, a planar diaphragm, and the exciter attached to the back side of the
diaphragm (Patent Document 3).
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[0007]
Patent Document 1: Japanese Patent Application Laid-Open No. 2000-115888 Patent Document
3: Japanese Patent No. 3694183 Patent Document No. 4032395
[0008]
An object of the present invention is to provide a speaker capable of effectively suppressing
overheating of a voice coil when a voice signal with a large output is input to the voice coil, as
compared with a conventional moving magnet type speaker.
[0009]
According to a first aspect of the present invention, there is provided a magnet in which one end
face is magnetized to the N pole and the other end face to the S pole, a diaphragm, and yokes
respectively provided on the pair of end faces of the magnet. A voice coil which accommodates
the magnet and the yoke so as to be able to reciprocate along the axial direction of the coil, and
one end is fixed to the diaphragm and the other end is fixed to the magnet. And a support
member for supporting the yoke in a reciprocating manner along the axial direction, a frame for
elastically supporting the peripheral portion of the diaphragm, and an opening fixed to the
bottom of the frame and to which the voice coil is attached And a heat sink.
[0010]
In the speaker, since the voice coil is fixed to the frame via the heat sink, disconnection of the
audio signal input terminal due to the vibration of the voice coil can be effectively prevented.
Also, since the voice coil is directly inserted into the opening of the heat sink, the heat generated
by inputting the voice signal to the voice coil is dissipated from the heat sink to the outside
world.
Also, part of the heat generated by the voice coil is radiated to the magnet, transmitted through
the support member to the diaphragm, and dissipated from the diaphragm to the outside world.
Therefore, overheating of the voice coil in the case where a voice signal with a large output is
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input to the voice coil is effectively suppressed.
[0011]
The magnet has a pair of end faces, and one end face of the pair of end faces is magnetized in the
N pole and the other in the S pole, and yokes are provided in both the N pole and the S pole.
Because of the construction, the magnet and the yoke are compact as a whole.
As a result, the followability of the magnet to the voice signal input to the voice coil is improved,
and voice reproduction with high accuracy becomes possible.
[0012]
According to a second aspect of the present invention, in the speaker according to the first
aspect, the support member is a rod-like main body, a diaphragm fixing part formed on one end
of the main body, and fixed to the back surface of the diaphragm And a magnet attachment part
formed at the other end of the part and to which a magnet is attached.
[0013]
In the speaker, the support member is fixed to the back surface of the diaphragm at the
diaphragm fixing portion at one end, and the magnet is attached to the magnet attachment
portion.
Therefore, the reciprocation of the magnet is efficiently transmitted to the diaphragm through
the main body.
[0014]
According to a third aspect of the present invention, in the speaker according to the second
aspect, a central hole extending along a reciprocation direction of the magnet is formed in a
central portion of the magnet and the yoke, and the support member The present invention
relates to a speaker which has a diameter smaller than that of the main body and which is
inserted and fixed to the center hole of the magnet and the yoke.
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[0015]
In the above speaker, the magnet attachment portion is smaller in diameter than the main body
portion, so by inserting the magnet attachment portion into the center holes of the magnet and
the yoke, the magnet and the yoke are inserted between the magnet attachment portion and the
main body portion. Positioned in the axial direction at the step.
[0016]
According to a fourth aspect of the present invention, in the speaker according to the second or
third aspect, the diaphragm fixing portion has a diameter larger than that of the main portion,
and the support member is formed in an umbrella shape as a whole. About.
[0017]
In the speaker, since the diaphragm fixing portion has a larger diameter than the main portion
and is formed in an umbrella shape, the ratio of the diameter of the diaphragm fixing portion to
the diameter of the main portion can be large.
Therefore, as compared with the case where the diaphragm fixing portion and the main body
portion have the same diameter in the supporting member, the fixing of the supporting member
to the diaphragm becomes more reliable, and the weight of the entire supporting member is also
reduced. it can.
Furthermore, the heat transferred from the magnet to the support member is more reliably
transferred from the support member to the diaphragm.
[0018]
According to a fifth aspect of the present invention, in the speaker according to the second or
third aspect, an opening is formed at a central portion of the diaphragm, the diaphragm fixing
portion of the support member has the same outer diameter as the main body, Or while having
an outer diameter smaller than a main-body part, it is related with what is penetrated fixed to the
said opening part of a diaphragm.
[0019]
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In the above-mentioned speaker, the support member has a rod-like form as a whole.
Therefore, the support member can be manufactured easily and inexpensively as compared with
a support member having an umbrella-like form as a whole.
[0020]
A sixth aspect of the present invention is the speaker according to the fifth aspect, wherein the
diaphragm fixing portion has an outer diameter smaller than that of the main portion, and a step
is formed between the diaphragm fixing portion and the main portion About things.
[0021]
In the above speaker, when the diaphragm fixing portion is inserted into and fixed to the opening
of the diaphragm, the diaphragm and the support member are positioned relative to each other
by the step formed between the diaphragm fixing portion and the main body. Thus, the support
member can be more reliably fixed to the diaphragm, as compared with the embodiment in
which there is no step between the diaphragm fixing portion and the main body portion.
[0022]
A seventh aspect of the present invention is the speaker according to any one of the first to sixth
aspects, wherein the support member is a high thermal conductivity metal selected from pure
aluminum, aluminum alloy, pure magnesium and magnesium alloy, or nitrided The present
invention relates to a high thermal conductivity ceramic selected from aluminum, silicon carbide,
sapphire, alumina, and silicon nitride.
[0023]
In the speaker, the support member is a high thermal conductivity metal such as pure aluminum,
aluminum alloy, pure magnesium, and magnesium alloy, or high thermal conductivity ceramic
such as aluminum nitride, silicon carbide, sapphire, alumina, and silicon nitride Since the support
member is formed from the above, the support member is high in thermal conductivity as well as
light in weight and excellent in strength as compared with the case of being formed of other
materials.
[0024]
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Therefore, in the speaker, the heat transferred from the voice coil to the magnet is effectively
transferred to the diaphragm through the support member.
In addition, the reciprocation of the magnet by inputting the voice signal to the voice coil is also
effectively transmitted to the diaphragm through the support member.
[0025]
According to an eighth aspect of the present invention, in the speaker according to any one of
the first to seventh aspects, the heat sink includes a central portion having an opening for
mounting a voice coil formed at a central portion, and the central portion And radially outward
extending fins.
[0026]
In the speaker, the heat generated by the voice coil is transferred to the center, and then
transferred to the fins and dissipated from the fins to the outside world.
[0027]
A ninth aspect of the present invention relates to the speaker of the eighth aspect, wherein the
fin extends from the central portion to the inner peripheral surface of the side wall of the frame
in a state where the heat sink is fixed to the bottom of the frame.
[0028]
In the speaker, since the fins of the heat sink extend from the center to the side wall of the frame,
the bottom of the frame has a configuration substantially constituted by the heat sink.
As a result, heat is dissipated more effectively as compared to a speaker in which the heat sink is
fitted in the opening formed at the center of the bottom of the frame.
[0029]
According to a tenth aspect of the present invention, in the speaker according to any one of the
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first to ninth aspects, the winding direction of the winding of the voice coil is one end side and
the other end side bordering on the axial center of the voice coil. And what about the opposite
direction.
[0030]
In the above-mentioned speaker, since the winding direction of the winding is opposite between
the one end half and the other half of the voice coil, when an audio signal is input to the voice
coil, the one end half and the other half Magnetic field lines in opposite directions are generated
in the end half.
Therefore, in the axial direction central portion where the magnetic lines of force on one end half
and the magnetic lines of force on the other half overlap, the lines of magnetic force intensify
each other.
Therefore, as compared with the case where the winding direction of the winding is the same
between the one end half and the other half of the voice coil, the diaphragm vibrates with a
larger amplitude if the output of the audio signal is the same. It can be done.
[0031]
An eleventh aspect of the present invention is the speaker according to any one of the first to
tenth aspects, wherein the yoke has a bottom contacting the end face of the magnet, and a side
wall rising from the bottom wall at the periphery of the bottom. Relates to what is a plate-like
yoke.
[0032]
In the above speaker, magnetic lines of force coming from the N pole of the magnet to the S pole
extend parallel to the inner circumferential surface of the voice coil through the side wall of the
yoke.
Therefore, since the magnetic lines of force formed by the magnet interlink with the winding of
the voice coil, if the output of the audio signal is the same, the electromagnetic force received by
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the magnet is greater than that in the case where the yoke does not have a side wall portion
growing.
Further, the yoke can be reduced in weight as compared with the case where the yoke has the
same washer shape as the height of the side wall portion.
[0033]
As described above, according to the present invention, it is possible to provide a moving magnet
type speaker that can more effectively suppress overheating of the voice coil even when an audio
signal with a large output is input to the voice coil.
[0034]
FIG. 1 is a cross-sectional view showing a cross section of the loudspeaker of Embodiment 1 cut
along an axis.
FIG. 2 is a perspective cross-sectional view showing the internal structure of the speaker of the
first embodiment.
FIG. 3 is a cross-sectional view showing a cross section of the loudspeaker of Embodiment 2
taken along the axis.
FIG. 4 is a perspective sectional view showing the internal structure of the loudspeaker of the
second embodiment.
FIG. 5 is a cross-sectional view showing a cross section of the loudspeaker of Embodiment 3
taken along the axis.
FIG. 6 is a perspective sectional view showing the internal structure of the loudspeaker of the
third embodiment.
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FIG. 7 is a cross-sectional view showing a cross section of the loudspeaker of the fourth
embodiment taken along an axis. FIG. 8 is a cross-sectional view showing a cross section of the
loudspeaker of the fifth embodiment taken along an axis. FIG. 9 is a perspective view showing an
overall configuration of a voice coil provided in the speaker of the first embodiment. FIG. 10A is a
cross-sectional view showing a cross section of the voice coil shown in FIG. 3 taken along the
axis, and FIG. 10B is a plan view showing a configuration of a separator provided in the voice
coil. FIG. 11 is a schematic view showing the operation of the voice coil shown in FIG. 9 and FIG.
FIG. 12 is a schematic view showing the operation of the voice coil shown in FIG. 9 and FIG. FIG.
13A is a perspective view showing a configuration of each of a magnet and a yoke provided in
the loudspeakers of Embodiments 1, 4 and 5, and FIG. 13B is a diagram showing the yoke
mounted on both end faces of the magnet. It is a perspective view which shows the state which
was carried out. Fig. 14 (A) is a perspective view showing a configuration of a support rod
provided in the speaker of Embodiments 1 and 4, and Fig. 14 (B) is a cross-sectional view
showing a cross section of the support rod taken along an axis. It is. Fig. 15 (A) is a perspective
view of a support rod provided in the speaker of Embodiments 2, 3 and 5, and Fig. 15 (B) is a cut
along the axis of the support rod shown in Fig. 15 (A). Is a cross-sectional view showing the cross
section. 15 (C) is a perspective view showing an example of a modification of the support rod
shown in FIGS. 15 (A) and 15 (B), and FIG. 15 (D) is a support shown in FIG. 15 (C) It is sectional
drawing which shows the cross section which cut | disconnected the stick | rod along the axis
line. Fig. 16 (A) is a plan view showing a configuration of a heat sink provided in the speaker of
Embodiments 1 and 5. Fig. 16 (B) is a plan view X- of the heat sink taken along an axis in Fig. 16
(A). It is sectional drawing which shows the cross section cut | disconnected along X. FIG. FIG. 17
is a plan view showing the configuration of the heat sink provided in the speakers of the second
to fourth embodiments. FIG. 18 is a plan view showing the configuration of a modification of the
heat sink shown in FIG. FIG. 19 is a plan view showing the configuration of still another
modification of the heat sink shown in FIG. Fig. 20 (A) is a plan view showing a configuration of a
frame provided in the loudspeakers of Embodiments 1 and 5. Fig. 20 (B) is an axial line in Fig. 20
(A) showing the frame shown in Fig. 20 (A). FIG. 6 is a cross-sectional view showing a cross
section cut along a plane Y-Y along FIG. Fig. 21 (A) is a plan view showing a configuration of a
frame provided in the loudspeaker according to Embodiments 2 to 4. Fig. 21 (B) is an axial line in
Fig. 21 (A) showing the frame shown in Fig. 21 (A). FIG. 6 is a cross-sectional view showing a
cross section cut along a plane Y-Y along FIG.
[0035]
1. Embodiment 1 Hereinafter, an example of a speaker of the present invention will be
described. <Structure> As shown in FIGS. 1 and 2, the speaker 1 according to the first
embodiment includes a circular diaphragm 12, a frame 16 that elastically holds the diaphragm
12, and a central portion of a bottom surface 16 A of the frame 16. Voice coil 18 fixed via heat
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sink 26, cylindrical magnet 20 housed inside voice coil 18, and support member fixed to
diaphragm 12 at one end and supporting magnet 20 at the other end And 24 as a support bar.
[0036]
The diaphragm 12, as shown in FIGS. 1 and 2, generally has a circular planar shape convexly
curved forward, that is, in a direction in which sound is emitted, but the planar shape is limited to
a circular shape. It may be elliptical or the like. The diaphragm 12 is formed of a material
selected from fiber materials such as paper and non-woven fabric, plastic materials such as PET
resin and polyimide resin, polyether-ether-ketone resin, and polypropylene resin, and mixtures
thereof. The diaphragm 12 can also be formed of aluminum or an alloy thereof, magnesium or an
alloy thereof, or the like.
[0037]
An edge 14 formed of an elastic material such as rubber is provided around the entire periphery
of the diaphragm 12 and elastically fixed to the frame 16 via the edge 14. In the example shown
in FIG. 1 and FIG. 2, the edge 14 has a semicircular concave cross section, but may have a wavy
cross section. The edge 14 is not limited to that shown in FIGS. 1 and 2, and one having a
semicircular projecting cross section may be used, and one having a circular or elliptical closed
cross section may also be used.
[0038]
The voice coil 18 is an air core coil as shown in FIG. 9 and FIG. 10A, and one end side coil 18A
located at one end side bordering the separator 19 located at the center in the axial direction and
the separator 19 And the other end side coil 18B positioned on the other end side with the
separator 19 as a boundary. Therefore, the voice coil 18 is divided into the one end side coil 18A
and the other end side coil 18B with the separator 19 as a boundary. The separator 19, the one
end side coil 18A and the other end side coil 18B are integrally formed.
[0039]
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The one end side coil 18A and the other end side coil 18B have the same inner diameter B and
the same outer diameter A, but as shown in FIG. 9 and FIG. 10A, the winding directions of the
windings are opposite to each other. It is done. The winding end portion of the one end side coil
18A and the winding start portion of the other end side coil 18B are connected by a crossover
wire 18C.
[0040]
On the other hand, as shown in FIGS. 9 and 10B, the separator 19 is a washer-like member made
of an insulating material and has the same inner diameter as the inner diameter B of the voice
coil 18, but the outer diameter is It is larger than the outer diameter A of the one end side coil
18A and the other end side coil 18B. The separator 19 is formed with a slit 19A through which
the winding start portion of the one end side coil 18A is inserted and a slit 19B through which
the crossover wire 18C is inserted.
[0041]
In the voice coil 18, as shown in FIGS. 1 and 2, the other end side coil 18B is inserted into the
opening of the heat sink 26, and the front surface of the heat sink 26 in the separator 19; It is
fixed to the upper surface. The coil pressing block 28 is attached and fixed to the outside of the
one end side coil 18A. The coil pressing block 28 is formed in an annular shape as a whole, and
the outer peripheral surface is formed in a conical surface shape which is reduced toward the
front. The coil holding block 28 is fixed to the front surface of the separator 19 and the heat sink
26 on the bottom surface.
[0042]
Although the above example is an example in which the voice coil 18 is a bobbinless coil, the
bobbins are integrally formed on both surfaces of the separator 19, and the winding is wound
around the respective bobbins in opposite directions. The voice coil 18 in which the coil 18A and
the other end side coil 18B are formed can also be preferably used.
[0043]
As shown in FIGS. 13A and 13B, the magnet 20 has a cylindrical shape as a whole, and a central
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hole 21 is formed at the central portion along the axis.
One end face of the magnet 20 is magnetized to the N pole, and the other end face is magnetized
to the S pole.
[0044]
The yoke 22 is a bottomed cylindrical body made of a ferromagnetic material, and has a bottom
22A and a side wall 22B. An opening 22C is formed in the center of the bottom 22A. The outer
diameter of the yoke 22 is substantially the same as the outer diameter of the magnet 20. The
yoke 22 is mounted on both end surfaces of the magnet 20 so as to be concentric with the
magnet 20 as shown in FIG. 13 (B).
[0045]
The yoke 22 may be formed in a washer shape, but as shown in FIGS. 13A and 13B, a dish-like
body having a bottom 22A and a side wall 22B, in other words, a bottomed cylindrical body By
doing so, weight reduction can be achieved as compared with the case of being formed in a
washer shape.
[0046]
As shown in FIGS. 14A and 14B, the support rod 24 is an example of a main body portion 24A
formed in a cylindrical shape as a whole and a diaphragm fixing portion formed at one end of the
main body portion 24A. And a magnet attachment portion 24C formed at the other end of the
main portion 24A.
[0047]
As shown in FIGS. 1, 2, 14 (A) and 14 (B), the umbrella-shaped portion 24B has a larger diameter
than the main portion 24A, and is formed into an umbrella or disc shape as a whole. The front
surface is curved in a convex shape in accordance with the shape of the back surface of the
diaphragm 12.
The umbrella portion 24B is bonded and fixed to the back surface of the diaphragm 12, that is,
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13
the rear surface of the front surface, that is, the surface opposite to the side to which the sound is
emitted.
The rear surface of the umbrella portion 24B may be a concave surface that is recessed forward
as in the present embodiment, but may be planar.
[0048]
The magnet mounting portion 24C has a cylindrical shape smaller in diameter than the main
body portion 24A, and as shown in FIGS. 1 and 2, the magnet 20 in a state where the yoke 22 is
mounted on both end surfaces is inserted. The magnet attachment portion 24C is inserted into
the opening 22C of the yoke 22 and the central hole 21 of the magnet 20, and is bonded and
fixed.
[0049]
The support rod 24 is preferably formed of a material having high thermal conductivity and light
weight. Such materials include high thermal conductivity metals selected from pure aluminum,
aluminum alloy, pure magnesium, and magnesium alloys, and high thermal conductivity ceramics
selected from aluminum nitride, silicon carbide, sapphire, alumina, and silicon nitride Etc. are
raised.
[0050]
As shown in FIGS. 1 and 2, the magnet 20 and the yoke 22 can be reciprocated along the axial
direction of the voice coil 18 in the internal cavity of the voice coil 18 with the support rod 24
being integrated with each other. Supported by
[0051]
As shown in FIGS. 16A and 16B, the heat sink 26 has a circular center in which the opening 26B
to which the other end side coil 18B of the voice coil 18 is inserted and adhesively fixed is
formed at the center. A portion 26A and fins 26C extending radially outward from the central
portion 26A.
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The heat sink 26 may also be formed from high thermal conductivity metals such as pure
aluminum, aluminum alloys, pure magnesium and magnesium alloys or high thermal conductivity
ceramics such as aluminum nitride, silicon carbide, sapphire, alumina and silicon nitride Is
preferred. Preferably, the central portion 26A and the fins 26C are integrally formed.
[0052]
As shown in FIG. 1, FIG. 2 and FIG. 20, the frame 16 has a bottom surface 16A to which the heat
sink 26 is fixed, and a side wall 16B rising from the peripheral portion of the bottom surface 16A
all around the bottom surface 16A. It is a bottom cylindrical member. At the center of the bottom
surface 16A of the frame 16, an opening 16C is formed in which the heat sink 26 is fitted and
fixed. On the other hand, the diaphragm 12 is elastically held via the edge 14 at the edge of the
side wall portion 16B.
[0053]
<Operation and Effect> When an audio signal is input to the voice coil 18 in the speaker 1, the
magnet 20 reciprocates along the axial direction of the voice coil 18 due to the axial magnetic
field generated in the voice coil 18.
[0054]
The reciprocation of the magnet 20 is transmitted to the diaphragm 12 via the support rod 24,
whereby the diaphragm 12 vibrates to generate sound.
[0055]
Since the voice coil 18 is inserted into and fixed to the opening 26B of the heat sink 26, the heat
generated by the voice coil 18 is transferred to the central portion 26A and then radiated from
the fins 26C to the outside.
[0056]
The heat generated by the voice coil 18 is also transmitted to the magnet 20, transmitted to the
diaphragm 12 through the support rod 24, and radiated from the diaphragm 12 to the outside.
03-05-2019
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[0057]
Thus, the heat generated by the voice coil 18 is radiated not only to the outside from the heat
sink 26 but also to the outside from the diaphragm 12 via the magnet 20 and the support rod
24, so Even when a high output voice signal is input, overheating of the voice coil 18 can be
effectively suppressed.
[0058]
Further, since the support rod 24 has a configuration in which the umbrella-shaped portion 24B
is formed at one end of the main body portion 24A formed in a bar shape as a whole, the heat
transmitted to the magnet 20 is the umbrella-shaped portion 24B and vibration. Effectively
emitted from the plate 12 to the outside world.
Therefore, the magnetic force reduction due to the heating of the magnet 20 is effectively
prevented.
[0059]
Furthermore, in the voice coil 18, the one end side coil 18A and the other end side coil 18B are
concentric with each other, but the winding direction is opposite.
Therefore, when an audio signal is input to the voice coil 18, as shown in FIGS. 11 and 12,
magnetic fields in opposite directions are generated.
[0060]
For example, as shown in FIG. 11, when a counterclockwise current flows in the one end side coil
18A, a clockwise current flows in the other end side coil 18B.
Thereby, the upper side in FIG. 11 of the one end side coil 18A is an N pole, the lower side is an S
pole, the upper side in the other end side coil 18B in FIG. 5 is an S pole, and the lower side is an
N pole.
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16
Therefore, in the voice coil 18, since the S poles strengthen each other at a portion between the
one end side coil 18A and the other end side coil 18B, the magnet 20 has a downward force as
shown by the arrow F in FIG. receive.
[0061]
On the other hand, as shown in FIG. 12, when a clockwise current flows in the one end side coil
18A, a counterclockwise current flows in the other end side coil 18B.
Thus, the upper side in FIG. 12 of the one end side coil 18A is the S pole and the lower side is the
N pole, the upper side in the other end side coil 18B in FIG. 12 is the N pole, and the lower side is
the S pole. Therefore, in the voice coil 18, since the N poles strengthen each other between the
one end side coil 18A and the other end side coil 18B, the magnet 20 receives an upward force
as shown by the arrow F in FIG.
[0062]
Thus, in the voice coil 18, since the winding directions of the winding of the one end side coil
18A and the other end side coil 18B are opposite to each other, between the one end side coil
18A and the other end side coil 18B Magnetic flux strengthens each other. Thus, unlike the case
where the winding directions of the first end coil 18A and the second end coil 18B are the same
as each other, in the magnet 20, a large electromagnetic force is generated along the axis of the
voice coil 18. Therefore, even when a low-output audio signal is input, a large audio can be
generated.
[0063]
In addition, the yoke 22 is concentrically attached to the magnet 20 on both end faces of the
magnet 20. Moreover, the outer diameter of the yoke 22 is substantially equal to the outer
diameter of the magnet 20. Therefore, by reducing the diameter of the magnet 20, the yoke 22
can also be reduced in size and weight, so that the size and weight of the entire speaker can be
reduced. Further, since the followability of the magnet 20 to the voice signal input to the voice
03-05-2019
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coil 18 is greatly improved, the voice signal can be reproduced with higher accuracy.
[0064]
2. Second Embodiment Another example of the speaker according to the present invention will
be described below. <Structure> As shown in FIGS. 3 and 4, the speaker 2 of Embodiment 2 is
fitted to a circular diaphragm 12, a frame 16 that elastically holds the diaphragm 12, and a
bottom opening of the frame 16. The heat sink 36 mounted and fixed, the voice coil 18 fixed to
the central portion of the heat sink 36, the cylindrical magnet 20 housed inside the voice coil 18,
and one end fixed to the diaphragm 12 at the other end And a support rod 34 as an example of a
support member for supporting the magnet 20 in
[0065]
The diaphragm 12 is curved in a convex shape toward the front as a whole, as in the speaker 1 of
the first embodiment. The planar shape and the material of the diaphragm 12 are as described in
the first embodiment, but an opening 12A for inserting the tip of the support rod 34 is formed in
the central portion.
[0066]
The diaphragm 12 is fixed to the frame 16 via the edge 14 provided over the entire
circumference, as in the speaker of the first embodiment, but as shown in FIGS. 3 and 4, the edge
14 has a semicircular protruding cross section. However, the edge 14 is not limited to those
shown in FIG. 3 and FIG. 4, and one having a semicircular concave cross section may be used,
and one having a circular or elliptical closed cross section may also be used.
[0067]
The voice coil 18 is an air-core coil and is located at the other end side of the separator 19 at the
one end side with the separator 19 located at the axial direction center part, the one end side
with the separator 19 as a boundary, and the separator 19 And the other end side coil 18B
whose winding direction is opposite to that of the one end side coil 18A is the same as the voice
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18
coil 18 in the speaker 1 of the first embodiment, but the voice of the speaker of the first
embodiment The dimension in the coil axial direction is larger than that of the coil. The other
points are as shown in FIGS. 9 and 10A.
[0068]
The voice coil 18 is fixed to the front surface of the heat sink 36 by the separator 19 while the
other end side coil 18B is inserted into the opening of the heat sink 36 as shown in FIGS. 3 and 4.
The coil pressing block 30 is attached and fixed to the outside of the one end side coil 18A. The
coil holding block 30 is a block made of aluminum or aluminum alloy which is formed in an
annular shape as a whole. The coil pressing block 30 is fixed to the front surface of the separator
19 and the heat sink 26 on the bottom surface.
[0069]
The magnet 20 is as described in the first embodiment. On the other hand, the yoke 22 is formed
of a ferromagnetic material as in the first embodiment and has a cylindrical shape with a bottom,
but the dimension of the voice coil 18 in the coil axial direction, that is, the vibration direction is
the yoke of the first embodiment. It is set larger than 22.
[0070]
The support rod 34 has a rod-like form as a whole as shown in FIG. 3, FIG. 4, FIG. 15 (A) and FIG.
15 (B), and is positioned at the main body 34A and one end of the main body 34A. And a magnet
attachment portion 34C which is a diameter-reduced portion formed at the other end of the main
body 34A.
[0071]
The tip portion 34B is a portion inserted into the opening 12A of the diaphragm 12 and
adhesively fixed to the inside of the opening 12A, and as shown in FIGS. 15A and 15B, the main
portion 34A and It may have the same outer diameter, and as shown in FIGS. 15 (C) and 15 (D), it
may have an outer diameter smaller than that of the main portion 34A.
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19
In the example shown in FIG. 15C and FIG. 15D, a step 34D is formed between the tip 34B and
the main body 34A. By providing the step 34D on the support rod 34, the positioning of the
diaphragm 12 and the support rod 34 is facilitated.
[0072]
In the magnet 20 and the yoke 22, as shown in FIGS. 3 and 4, the bottom surface 22A of one
yoke 22 is attracted to the N pole of the magnet 20 and the bottom surface 22A of the other
yoke 22 is attracted to the S pole of the magnet 20. , And fixed to the magnet mounting portion
34C.
[0073]
The support rod 34 is formed of a material selected from high thermal conductivity metals and
high thermal conductivity ceramics, as with the support rod 24 of the first embodiment.
[0074]
As shown in FIGS. 3, 4 and 21, the frame 16 is a cylindrical member having side walls 16B and
an opening 16C which is open on the entire bottom surface and to which the heat sink 36 is
fixed.
The diameter of the opening 16C of the frame 16 is equal to the inner diameter of the side wall
16B, and a protrusion 16D for positioning the heat sink 36 is formed above the opening 16C in
the inner peripheral surface of the side wall 16B.
The diaphragm 12 is elastically held via the edge 14 at the upper edge of the side wall portion
16B.
[0075]
As shown in FIGS. 3, 4 and 17, the heat sink 36 has a circular central portion 36 </ b> A with an
opening 36 </ b> B formed at the central portion, and fins 36 </ b> C extending radially outward
from the central portion 36 </ b> A. , And an annular portion 36D which intersects with the fins
36C and is formed concentrically with the main body 36A. The other end side coil 18B of the
03-05-2019
20
voice coil 18 is inserted into the opening 36B and fixed by adhesion.
[0076]
The heat sink 36 is also preferably formed of a high thermal conductivity metal or a high thermal
conductivity ceramic. Preferably, the central portion 36A, the fins 36C and the annular portion
36D are integrally formed.
[0077]
When the heat sink 36 is fitted to the frame 16, the bottom of the frame 16 is substantially
formed by the heat sink 36, as shown in FIGS. 3 and 4.
[0078]
In the heat sink 36, as shown in FIG. 18, all the annular parts 36D may be omitted, and as shown
in FIG. 19, annular parts 36D other than the outermost annular part 36D. May be omitted.
[0079]
The speaker 2 has the same configuration as the speaker 1 of the first embodiment except for
the points described above.
[0080]
<Operation and Effect> When an audio signal is input to the voice coil 18 in the speaker 2, the
magnet 20 reciprocates along the axial direction of the voice coil 18 due to the axial magnetic
field generated in the voice coil 18.
[0081]
The reciprocation of the magnet 20 is transmitted to the diaphragm 12 through the support rod
34, whereby the diaphragm 12 vibrates to generate sound.
[0082]
Here, as shown in FIGS. 3 and 4, the heat sink 36 is configured to substantially occupy the entire
03-05-2019
21
bottom surface of the frame 16 in a state of being mounted on the frame 16.
Therefore, since the heat sink 36 can be enlarged compared to the speaker 1 of the first
embodiment in which the heat sink 26 occupies only the central portion of the bottom surface
16A of the frame 16, the heat generated by the voice coil 18 is more effective through the heat
sink 36. To the outside world.
[0083]
Further, by providing the annular portion 36D so as to intersect the fins 36C, the rigidity in the
circumferential direction of the fins 36C is improved as compared with the case where the
annular portion 36D is not provided.
The heat transferred from the central portion 36A to the fins 36C is not only dissipated to the
outside from the fins 36C, but also transferred to the annular portion 36D and dissipated from
the annular portion 36D.
Therefore, a higher heat dissipation effect can be obtained as compared to the case where the
heat sink 36 does not have the annular portion 36D.
[0084]
The heat generated by the one end side coil 18A is transmitted to the heat sink 36 through the
coil holding block 30 attached to the one end side coil 18A and dissipated from the heat sink 36
to the outside.
[0085]
Further, the heat generated by the voice coil 18 is transmitted to the yoke 22 and the magnet 20
and is also dissipated from the diaphragm 12 through the support rod 34.
[0086]
Furthermore, since the support bar 34 has a rod-like form as a whole, it can be manufactured
inexpensively and easily as compared with the support bar 24 of Embodiment 1 having an
umbrella-like or a bowl-like form as a whole. .
03-05-2019
22
[0087]
In addition, when the dimensions of the voice coil 18 and the yoke 22 in the coil axial direction
are larger than those of the voice coil 18 and the yoke 22 in the speaker according to the first
embodiment, they have excellent bass characteristics and receive a large output audio signal. The
magnet 20 and the yoke 22 are effectively prevented from jumping out of the voice coil 18.
[0088]
3.
Embodiment 3 Hereinafter, another example of the speaker of the present invention will be
described.
<Structure> As shown in FIGS. 5 and 6, the speaker 3 of the third embodiment is configured such
that the heat sink 26 is concentrically overlapped on the heat sink 36 in the speaker 2 of the
second embodiment.
[0089]
In the speaker 3, the heat sink 36 is inserted into and fixed to the opening 16 </ b> C of the
frame 16 as in the speaker 2 of the second embodiment.
The other end side coil 18B of the voice coil 18 is inserted and fixed to the opening 36B of the
heat sink 36.
The voice coil 18 is fixed to the front surface of the heat sink 36 in the separator 19, in other
words, the upper surface in FIGS. 5 and 6.
[0090]
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23
A heat sink 26 is disposed on the front side of the separator 19, that is, above the heat sink 36 in
FIGS. 5 and 6.
The one end side coil 18 </ b> A of the voice coil 18 is inserted and fixed to the opening 26 </ b>
A of the heat sink 26.
[0091]
An annular coil pressing block 32 is further inserted and fixed to the one end side coil 18A.
Instead of providing the coil pressing block 32, the thickness of the heat sink 26 may be set to be
substantially the same as the dimension in the coil axial direction of the one end side coil 18A.
[0092]
The heat sink 26 has an outer diameter smaller than that of the heat sink 36, and has the
configuration shown in FIGS. 16 (A) and 16 (B). However, the outer diameter of the heat sink 26
may be the same as that of the heat sink 36, and may be configured as shown in FIGS.
[0093]
In the embodiment shown in FIGS. 5 and 6, the heat sink 26 is disposed such that the fins 26C
overlap the fins 36C of the heat sink 36 in plan view, but the heat sink 26 is a fin of the heat sink
36 in terms of the fins 26C in plan view. It may be arranged to alternate with 36C.
[0094]
The speaker 3 has the same configuration as the speaker 2 of the second embodiment except for
the points described above.
[0095]
03-05-2019
24
<Operation and Effect> In the speaker 3, the heat generated at the other end side coil 18B by
inputting the audio signal to the voice coil 18 is transmitted to the heat sink 36 and dissipated to
the outside world.
On the other hand, part of the heat generated by the end side coil 18A is dissipated from the heat
sink 26 to the outside, while the remainder is transmitted from the heat sink 26 to the heat sink
36 and dissipated from the heat sink 36 to the outside.
[0096]
The speaker 3 has the same operations and effects as the speaker 2 of the second embodiment
except for the above-mentioned point.
[0097]
Therefore, in the speaker 3, the heat generated in the voice coil 18 can be more effectively
dissipated to the outside as compared to the speaker 2 of the second embodiment, so that
overheating of the voice coil 18 can be more effectively prevented.
[0098]
4.
Embodiment 4 Hereinafter, still another example of the speaker of the present invention will be
described.
As shown in FIG. 7, the speaker 4 of the fourth embodiment is configured by combining the
speaker 1 of the first embodiment with the frame 16 and the heat sink 36 that the speaker 2 of
the second embodiment has.
The configurations of the frame 16 and the heat sink 36 are as described in the second
embodiment.
[0099]
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25
Parts other than the frame 16 and the heat sink 36 in the speaker 4 have the same configuration
as that described in the first embodiment. Accordingly, the support rods 24 also have an
umbrella-like form as a whole, as described in the first embodiment.
[0100]
Since the heat sink 36 of the speaker 4 has a ring part 36 D in addition to the central part 36 A
and the fins 36 C in addition to the large outer diameter compared to the heat sink 26 of the
speaker 1 of Embodiment 1, the heat from the voice coil 18 Are more effective, and overheating
of the voice coil 18 is more effectively prevented.
[0101]
Further, the support rod 24 is generally umbrella-shaped, and the heat generated by the magnet
20 is effectively dissipated to the outside through the umbrella portion 24 B and the diaphragm
12, so the magnetic force is reduced due to overheating of the magnet 20. Is also effectively
prevented.
[0102]
5.
Fifth Embodiment Hereinafter, still another example of the speaker of the present invention will
be described.
As shown in FIG. 8, the speaker 5 of the fifth embodiment is configured by combining the
speaker 1 of the first embodiment with the support rod 34 and the diaphragm 12 of the speaker
2 of the second embodiment. The configuration of the support bar 34 is as described in the
second embodiment.
[0103]
Therefore, the speaker 5 has the configuration as described in the first embodiment except for
the support rod 34.
03-05-2019
26
[0104]
The speaker 5 has the feature that the support bar 34 is inexpensive and easy to manufacture as
compared with the support bar 24 having an umbrella-like form, since the support bar 34 has a
generally rod-like form.
[0105]
Reference Signs List 1 speaker 2 speaker 3 speaker 4 speaker 5 speaker 12 speaker 12
diaphragm 12A opening 14 edge 16 frame 18 voice coil 18A one end side coil 18B other end
side coil 18C cross wire 19 separator 20 magnet 21 center hole 22 yoke 22A bottom 22B side
wall 22C Opening 24 Support bar 24A Body 24B Umbrella 24C Magnet attachment 26 Heat sink
26A Center 26B Opening 26C Fin 34 Support bar 34A Body 34B Umbrella 34C Magnet
attachment 36 Heat sink 36A Center 36B Opening 36C Fin 36D ring part
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27
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