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JP2005341475

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JP2005341475
PROBLEM TO BE SOLVED: To suppress an abnormal temperature rise of a voice coil even in a
speaker aiming to increase the input, heat can be collected from upper and lower portions of the
voice coil almost evenly and dissipated to the outside, and the heat of the voice coil due to large
input An object of the present invention is to provide a speaker with high input resistance that
can increase the breakage limit and can exhibit stable performance. SOLUTION: First and second
metal heat dissipators 4, 8 are provided respectively on the upper and lower sides of a plate 7,
and heat generated from the voice coil 10 is collected almost evenly through the respective metal
heat dissipators 4, 8 and dissipated. The inner end portions of the metal heat dissipating
members 4 and 8 are each substantially L-shaped and disposed so as to face the voice coil 10 to
enhance heat collection. [Selected figure] Figure 1
スピーカ
[0001]
The present invention relates to an electroacoustic transducer such as a speaker, which is a type
of acoustic equipment, and more particularly to a high input tolerant speaker in which the heat
dissipation of a voice coil is improved.
[0002]
The general configuration of the conventional electroacoustic transducer is to couple an annular
magnet to the front of a bottom plate integrally coupled with a pole piece at the center, and
further couple an annular top plate to the front of the top plate A frame is coupled, a peripheral
portion of a damper having a voice coil fitted to the magnetic gap in a central portion thereof
coupled to the magnetic gap formed between the pole piece and the annular top plate is coupled
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to the frame; A peripheral portion of a diaphragm in which a coil is coupled to a central portion is
coupled to the frame, and a dust cap is provided at the central portion.
[0003]
In the electro-acoustic transducer according to the above-described conventional configuration,
the heat generation from the voice coil is dissipated by the top plate, bottom plate, etc. of the
magnetic circuit, but when a large input is continuously applied, the temperature of the voice coil
rises. The magnetic circuit itself has a high temperature, so that sufficient heat radiation can not
be performed, and in the worst case, the voice coil can not withstand the temperature rise and is
disconnected.
[0004]
For this reason, as shown in FIG. 6, an electroacoustic transducer having a structure that radiates
heat from the frame 14 'provided on the front of the plate 7' and installs the metal component 8
'for radiating heat on the front of the plate 7' Various types of development have been developed,
but heat release from the voice coil 10 'can not be sufficiently dissipated by the metal part 8' for
heat dissipation from the front of the plate 7 'alone, and there is a risk that the voice coil 10' may
be thermally destroyed. The
An example of the prior art as shown in FIG. 6 is Japanese Utility Model Application Laid-Open
No. 62-178691.
Japanese Utility Model Sho 62-178691
[0005]
The present invention solves the above-mentioned conventional problems and suppresses
abnormal temperature rise of the voice coil even in the speaker intended to increase the input,
and heat generated from the voice coil can be collected almost equally up and down and
dissipated to the outside. It is an object of the present invention to provide a high input resistant
speaker capable of enhancing the thermal destruction limit of a voice coil by input and exhibiting
stable performance.
[0006]
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2
The invention according to claim 1 comprises a pole piece 2 in which a magnet 3 is provided on
the front surface of a bottom plate 2a, and a plate 7 whose inner peripheral surface is opposed to
the outer peripheral surface of the pole piece 2 via a magnetic gap 9 In the speaker in which the
voice coil 10 is provided in the magnetic gap 9, first and second metal heat dissipating members
4 and 8 are provided on the upper and lower surfaces of the plate 7, respectively, The above
object is achieved as a configuration in which the components are disposed apart from and
facing each other.
According to a second aspect of the present invention, in the first aspect, the inner end portions
of the first and second metal heat dissipators 4, 8 have substantially L-shaped longitudinal cross
sections, and the bent portions 5a, 8a thereof. Are arranged to face the voice coil 10.
According to a third aspect of the present invention, in the first aspect, the inner metal ring 5
having a substantially L-shaped longitudinal cross section is provided at the inner end of the first
metal heat radiator 4 and the bending portion 5a is a voice The first metal heat dissipating
member 4 is disposed to face the coil 10 and has a spoke structure, and the spokes 4c are
housed in a recess 7a formed on the lower surface of the plate 7. According to a fourth aspect of
the present invention, in the first aspect, the outer end portions of the first and second metal heat
sinks 4 and 8 project outward from the plate 7 and the outside of the first metal heat sink 4 It is
characterized in that metal fins 6 for heat dissipation are provided at the end.
[0007]
According to the first aspect of the present invention, since the first and second metal heat
dissipating members 4 and 8 are provided on the upper and lower sides respectively so as to
sandwich the plate 7 in a sandwich form, the heat generation from the voice coil 10 is
substantially equally applied to the upper and lower sides Since the heat is efficiently collected
and dissipated, the temperature rise of the voice coil 10 due to the large input can be kept
constant. Therefore, it is possible to add a larger input, and a speaker with high input tolerance
can be realized.
[0008]
According to the second aspect of the present invention, since the inner end portions of the first
and second metal heat dissipators 4, 8 opposed to the voice coil 10 are substantially L-shaped
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and the opposed surface is enlarged, generation from the voice coil 10 occurs. Heat can be
collected efficiently.
[0009]
According to the invention of claim 3, since the substantially L-shaped inner metal ring 5 is
provided at the inner end portion of the first metal heat dissipating member 4, the heat collecting
property is good, and the first metal heat dissipating member 4 is Since it arrange | positions in
the recessed part 7a of 7 lower surfaces, heat can be thermally radiated along the metal heat sink
4 in the recessed part 7a, and the thickness increase of the magnetic circuit 1 can be prevented.
[0010]
According to the fourth aspect of the present invention, the outer end portions of the two metal
heat dissipating members 4 and 8 are made to project outward from the plate 7, and the heat
dissipating metal fins 6 are provided on the outer end portion of the first metal heat dissipating
member 4. Therefore, the heat can be dissipated efficiently to the outside.
[0011]
Hereinafter, embodiments of the present invention will be described with reference to the
drawings.
[0012]
Embodiment 1 FIG. 1 shows a longitudinal sectional view of an embodiment of the present
invention.
[0013]
In the figure, a magnetic circuit 1 has a disk-shaped bottom plate 2a formed in the lower part in
the illustrated state, which is integrally coupled to the central portion of the bottom plate 2a and
extends upward. A substantially hollow cylindrical pole piece 2 is provided.
[0014]
An annular magnet 3 is provided on the front surface of the bottom plate 2 a, and an annular
first metal heat dissipating member 4 is provided on the front surface of the magnet 3.
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4
An inner metallic ring 5 is provided below the inner end of the first metal heat sink 4.
Further, at the outer end portion, a radiating metal fin 6 having a concavo-convex shape like a
gear is provided.
[0015]
FIG. 2 is a plan view of the first metal heat sink 4, FIG. 3 is a side view, and FIG. 4 is a bottom
view.
The first metal heat dissipating member 4 has a spoke structure, and includes an inner annular
portion 4a and a concentric outer annular portion 4b disposed on the outer side, and between
the inner and outer annular portions 4a and 4b. Are connected by a plurality of radial spokes 4c,
and a heat-radiating metal fin 6 having irregularities is formed on the outer peripheral portion of
the outer annular portion 4b.
The connection by the spokes 4c in this manner is to reduce the weight.
The number of spokes 4c is not limited to six as in the illustrated example, but may be increased
or decreased as appropriate.
[0016]
In FIG. 1, reference numeral 7 denotes an annular plate, and a plurality of recessed portions 7a in
the form of grooves for accommodating the first metal heat dissipating member 4 are formed on
the rear surface.
The recesses 7a are radially formed from the inner end to the outer end of the rear surface of the
plate 7, and the spokes 4c of the first metal heat sink 4 are located in these recesses 7a to
increase the thickness of the magnetic circuit 1. To prevent the magnetic circuit 10 from being
enlarged.
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[0017]
FIG. 1 is a cross-sectional view of the speaker corresponding to the line A-A 'in FIG. 2 and shows
a state in which the spokes 4c are accommodated in the recess 7a. Further, the protrusion (see
FIG. 3) on the front side of the inner annular portion 4a of the first metal heat dissipating
member 4 is also accommodated in an annular recess (not shown) formed on the inner side of
the plate 7. The cross section of the speaker corresponding to the line B-B 'in FIG. 2 is shown in
FIG. As shown in FIG. 5, the front surface of the magnet 3 is joined to the lower surface of the
plate 7 other than the recess 7a.
[0018]
As shown in FIGS. 1 and 5, the rear surface of the inner end portion of the plate 7 is substantially
L-shaped, and the front inner end portion of the inner metal ring 5 is joined to the lower portion.
The inner metal ring 5 connected to the first metal heat dissipating member 4 is substantially Lshaped, and the bent portion 5a is annular.
[0019]
Furthermore, on the front surface of the plate 7, an annular second metal heat dissipating
member 8 is provided. The inner end portion of the second metal heat sink 8 is also formed
substantially in an L shape, and the bent portion 8a has an annular shape. The second metal heat
dissipating body 8 does not have a spoke structure.
[0020]
Further, a magnetic gap 9 is formed between the inner peripheral surface of the annular plate 7
coupled to the front surface of the annular magnet 3 and the pole piece 2, and the cylindrical
voice coil 10 can vibrate in the magnetic gap 9. Are located in
[0021]
The central portion of the second metal heat dissipating member 8, ie, the bent portion 8a, is
disposed opposite to the voice coil 10, and the outer end portion, ie, the peripheral portion of the
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second metal heat dissipating member 8 is preferably a plate. It projects outward from the outer
end of 7.
[0022]
The inner end portion of the second metal heat dissipating member 8 disposed so as to face the
voice coil 10 so as to be separated from the voice coil 10 is substantially L-shaped to form the
bent portion 8a. It is because the heat of 10 was collected efficiently.
Further, the outer end portion of the second metal heat dissipating member 8 is preferably
protruded outward from the plate 7 in order to enhance the heat dissipating effect.
[0023]
The inner metal ring 5 provided below the central portion, ie, the inner end portion, of the first
metal heat sink 4 is also formed substantially in an L shape in order to enhance heat collection,
and its bent portion 5a is formed into a voice coil 10 The reason why they are spaced apart from
each other is also to improve heat collection.
[0024]
The first and second metal heat sinks 4 and 8 are made of a heat conductive material such as
aluminum or copper.
The inner metal ring 5 is also formed of the same material.
[0025]
Further, the voice coil 10 is provided on the rear outer peripheral surface of the cylindrical voice
coil bobbin 11.
An inner end portion of a damper 12 is coupled to the voice coil bobbin 11 and is vibratably
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supported, and a front portion of the voice coil bobbin 11 is coupled to a neck portion 13 b of a
conical diaphragm 13 to drive the diaphragm 13. Is configured as.
[0026]
The bottom surface 14a of the frame 14 having a bowl shape is formed on the front surface of
the second metal heat dissipating body 8, and the outer periphery of the damper 12 is supported
by the step 14b of the frame 14. The outer peripheral part of the diaphragm 13 is supported on
the front part 14c via the edge 15, and a speaker is comprised.
[0027]
In operation, when an audio signal is input to the voice coil 10, the diaphragm 13 vibrates
accordingly.
[0028]
In this case, the voice coil 10 generates heat when a large input is continuously applied.
[0029]
In the present invention, first and second metal heat dissipators 4 and 8 are provided on the
front and back of the plate 7, and the plate 4 is sandwiched to sandwich heat generation from the
voice coil 10 almost evenly. A substantially L-shaped inner metal ring 5 is provided at the inner
end of the first metal heat dissipating member 4, and the bent portion 5a of the first metal heat
dissipating member 4 and the substantially L-shaped bent portion 8a of the second metal heat
dissipating member 8 are voiced A heat dissipating metal which is made to face the coil 10 and
quickly collects heat generated by the voice coil 10 and guides the heat by the first metal heat
dissipating member 4 along the recess 7 a provided on the lower surface of the plate 7 The heat
is dissipated to the outside through the fins 6 and is also collected by the second metal heat
dissipating member 8 to dissipate heat.
[0030]
Of course, in the above embodiment, the first metal heat dissipating member 4 and the inner
metal ring 5 may be integrally formed.
[0031]
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The speaker cross section corresponding to the A-A 'line | wire in FIG. 2 of one Example of this
invention is shown.
The top view of the 1st metal heat sink used by the present invention is shown.
The side view same as the above is shown.
The bottom view of the same is shown.
The speaker cross section corresponding to the B-B 'line | wire in FIG. 2 is shown.
Cross-sectional explanatory drawing of a prior art example is shown.
Explanation of sign
[0032]
DESCRIPTION OF SYMBOLS 1 magnetic circuit 2 pole piece 2a bottom plate 3 magnet 4 1st
metal heat sink 4a inner annular part 4b outer annular part 4c spoke 5 inner metal ring 5a bent
part 6 metal fin for thermal radiation 7 plate 7a recessed part 8 second Metal heat sink 9
Magnetic gap 10 Voice coil 11 Voice coil bobbin 12 Damper 13 Diaphragm 13a Neck 14 Frame
14a Bottom 14b Step 14c Front 15 Edge
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