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JP2003299185

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Notice
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complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JP2003299185
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
loudspeaker structure, and more particularly to a loudspeaker structure in which a magnetic
circuit is disposed in front of a diaphragm.
[0002]
2. Description of the Related Art Heretofore, a speaker is roughly constituted of a diaphragm, a
voice coil (voice coil bobbin), a frame and a magnetic circuit.
[0003]
In addition, various proposals have been made for such a speaker to adopt a cooling structure for
cooling a voice coil etc. (Japanese Patent Application Laid-Open Nos. 9-130889, 6-233367, and
6). -29299 and Japanese Utility Model Laid-Open No. 11-47 etc.).
[0004]
The temperature rise of the voice coil greatly affects the limit of the input resistance, and the
cooling structure is adopted from the viewpoint that the input resistance can not be set high.
[0005]
On the other hand, by arranging the magnetic circuit in front of the diaphragm utilizing the space
in front of the diaphragm, the heat dissipation effect is promoted, and a space for arranging the
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magnetic circuit etc. behind the diaphragm is unnecessary, and the entire speaker Various
speakers have also been proposed which have realized the downsizing and thinning of the
speaker (see Japanese Patent Application Laid-Open Nos. 2000-78688, 2000-350275, and 865784).
[0006]
At this time, in order to dispose the magnetic circuit in front of the diaphragm, a magnetic circuit
holding member having a depth in the front-rear direction separately (or abolished) from the
center pole disclosed in JP-A-9-130889 and the like. Is required.
[0007]
FIG. 4 is a partially cutaway view showing an example of a speaker in which a magnetic circuit is
disposed in front of such a diaphragm.
In FIG. 4, 1 is a diaphragm, 2 is a magnetic circuit disposed in front of the diaphragm 1, 3 is a
voice coil for driving the magnetic circuit 2 to the magnetic gap formed by the magnetic circuit 2,
and 4 is a voice coil 3. The aluminum die-cast magnetic circuit holding unit is integrally formed
with a magnetic circuit holding seat 4b for fixing (adhesion or screwing) the magnetic circuit 2 to
the front end face of the cylindrical portion 4a while the cylindrical portion 4a is positioned on
one side. A member 5 is a frame made of sheet metal holding the peripheral portion of the
diaphragm 1 and fixing the flange portion 4 c of the magnetic circuit holding member 4 with a
screw 6.
[0008]
By the way, in the speaker structure configured as described above, the heat radiation effect is
promoted by arranging the magnetic circuit 2 in front of the diaphragm 1. There was a problem
that it did not reach to secure sufficient heat dissipation effect.
[0009]
Therefore, as shown in FIG. 5, it is considered that the air holes 5a are formed in the frame 5, and
the air flow is formed from the space between the voice coil 3 and the cylindrical portion 4a to
the air holes 5a to promote the heat dissipation effect. (A hole similar to Japanese Patent
Application Laid-Open No. 2000-350275 is formed in the frame).
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2
[0010]
However, in such a configuration, since there is a distance from the voice coil 3 which actually
generates heat to the air hole 5a, there is a problem that it is still insufficient from the viewpoint
of the heat radiation effect.
[0011]
An object of the present invention is to provide a speaker structure capable of sufficiently
securing a heat radiation effect while a magnetic circuit is disposed in front of a diaphragm in
order to solve the above-mentioned problems.
[0012]
SUMMARY OF THE INVENTION In order to achieve the object, the loudspeaker structure
according to the first aspect of the present invention is directed to a front position from a central
rear position of the diaphragm to arrange a magnetic circuit in front of the diaphragm. And a
voice for driving the diaphragm with a magnetic gap formed by the magnetic circuit, and a
magnetic circuit holding member integrally formed with a cylindrical portion which rises up and
a magnetic circuit holding seat provided on the front end face of the cylindrical portion In a
speaker structure comprising a coil, a frame for holding the diaphragm and the magnetic circuit
holding member, an opening formed on an end face of the magnetic circuit holding member
facing the magnetic circuit holding seat, and the magnetic circuit holding member. The gist of the
present invention is to provide a through hole which is penetrated to the peripheral surface of
the circuit holding member and a radiation fin which is formed in a rib shape from the inner wall
of the magnetic circuit holding member.
[0013]
The speaker structure according to claim 2 is characterized in that a plurality of the through
holes are formed and located in the vicinity of the magnetic circuit. A magnetic circuit holding
member integrally formed with a cylindrical portion rising from a central rear position of the
diaphragm toward a front position to arrange a magnetic circuit and a magnetic circuit holding
seat provided on the front end surface of the cylindrical portion And a voice coil for driving the
diaphragm with a magnetic gap formed by the magnetic circuit, and a frame for holding the
diaphragm and the magnetic circuit holding member, the magnetic circuit holding member and
the magnetic circuit holding member. The gist is that the frame and the frame are integrally
formed to be thick by aluminum die casting.
[0014]
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3
The speaker structure according to a fourth aspect of the present invention is summarized as the
cylindrical portion has a cylindrical shape at least in the vicinity of the magnetic circuit holding
seat.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of a speaker structure
according to the present invention will be described based on the drawings.
1 and 2 show Embodiment 1 of the speaker structure of the present invention, FIG. 1 is a
longitudinal sectional view of the speaker, and FIG. 2 (A) is a cutaway view of the magnetic
circuit holding member, FIG. 2B is a bottom view of the magnetic circuit holding member.
[0016]
In FIG. 1, the speaker 10 includes a diaphragm 11, a magnetic circuit 12 disposed in front of the
diaphragm 11, a voice coil 13 for driving the magnetic circuit 12 in a magnetic gap formed by
the magnetic circuit 12, and an inner side of the voice coil 13. A magnetic circuit holding
member 14 integrally formed with a magnetic circuit holding seat 14b for fixing (adhesion or
screwing) the magnetic circuit 12 to the front end face of the cylindrical portion 14a, and the
diaphragm A frame 15 made of a sheet metal is provided, which holds the peripheral edge
portion 11 and fixes the flange portion 14 c of the magnetic circuit holding member 14 with a
screw 6.
[0017]
The magnetic circuit 12 includes a yoke 16, a magnet 17, and a plate 18, and is disposed in front
of the diaphragm 11 by utilizing the space in front of the diaphragm 11, thereby promoting a
heat dissipation effect and downsizing the entire speaker 10. In addition, it has achieved
thinning.
[0018]
The magnetic circuit holding member 14 is formed thicker than the frame 15, and is formed of
aluminum, copper, brass, zinc, or an alloy thereof.
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Aluminum die casting is preferable in consideration of heat dissipation (endothermic property)
and formability unique to the material.
Further, the magnetic circuit holding member 14 is expanded rearward to open the rear end
thereof to form an opening 14d.
[0019]
A plurality of through holes 14 e are formed on the front side of the cylindrical portion 14 a of
the magnetic circuit holding member 14 (in the vicinity of the magnetic circuit holding seat
surface 14 b).
The through holes 14 e are not limited to the perfect circular shape, and may be any shape such
as an ellipse or a polygon.
Also, the number and size thereof are not particularly limited.
[0020]
As shown in FIG. 2, a plurality of rib-shaped radiation fins 14 f are formed on the inner wall of at
least the cylindrical portion 14 a of the magnetic circuit holding member 14.
The heat dissipating fins 14f are formed at equal intervals toward the center over the entire
length in the depth direction of the cylindrical portion 14a.
[0021]
Screw holes 14 g are formed in the flange portion 14 c of the magnetic circuit holding member
14.
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A plurality of screw holes 14g may be formed in accordance with the weight of the magnetic
circuit holding member 14 or the like.
[0022]
The frame 15 is integrally formed (punched or the like) from a thin sheet metal, and an air hole
15a is formed.
[0023]
In the above configuration, the heat generated by the voice coil 13 and the magnetic circuit 12 is
transmitted from the through hole 14e to the air path from the through hole 14e to the opening
14d via the inside of the cylindrical portion 14a, and between the voice coil 13 and the
cylindrical portion 14a. It is discharged from the two systems of the air path leading to the air
hole 15a to the outside.
[0024]
In other words, a continuous air path (also reversed) from the opening 14d to the inside of the
cylindrical portion 14a, the through hole 14e, between the voice coil 13 and the cylindrical
portion 14a, and the air hole 15a is formed. In combination with the separation between the
opening 14 d serving as the vent and the air hole 15 a serving as the exhaust port, cooling air not
affected by the heat of the voice coil 13 is fed into the air path by the air supply and exhaust. Is
also possible.
[0025]
In addition, the heat dissipating effect is promoted by the heat dissipating fins 14f, and since the
heat dissipating fins 14f are along the above-described air path (or air path), air is less likely to
stay in the internal space of the cylindrical portion 14a In addition to forming an air path (air
path), the air flowing through the air path (air path) can also enable cooling of the heat
dissipating fins 14f.
[0026]
Second Embodiment FIG. 3 shows a second embodiment of the speaker structure according to
the present invention, and FIG. 3 is a cutaway view of the speaker.
[0027]
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In FIG. 3, the speaker 20 includes a diaphragm 21, a magnetic circuit 22 disposed in front of the
diaphragm 21, and a voice coil 23 for driving the magnetic circuit 22 in a magnetic gap formed
by the magnetic circuit 22. And a magnetic circuit holding seat 24b integrally formed with a
magnetic circuit holding seat 24b for fixing (adhesion or screwing) the magnetic circuit 22 to the
front end face of the cylindrical portion 24a and for holding the magnetic circuit integral with
the diaphragm portion 24a. A member 24 is provided.
[0028]
The magnetic circuit 22 includes a yoke 26, a magnet 27, and a plate 28. By arranging the
magnetic circuit 22 in front of the diaphragm 21 using the space in front of the diaphragm 21,
the heat dissipation effect is promoted and the overall size of the speaker 20 is reduced. In
addition, it has achieved thinning.
[0029]
The magnetic circuit holding member 24 is provided with a frame portion 24c for holding the
peripheral portion of the diaphragm 21 by integral formation of aluminum die casting.
[0030]
The magnetic circuit holding member 24 is expanded rearward to open the rear end thereof to
form an opening 24d.
[0031]
By the way, the magnetic circuit holding member 24 according to the second embodiment cools
(radiates) the voice coil 23 and the magnetic circuit 22 by securing the characteristics and
thickness of the material, but secures the radiation effect. In order to do this, the opening 24d
may be eliminated and the whole of the cylindrical portion 24a may be formed of only the
material.
[0032]
Further, as in the first embodiment, the inside of the cylindrical portion 24a may be hollow, and
then the plurality of through holes 14e and holes similar to the air holes 15a may be formed.
[0033]
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Furthermore, as in the first embodiment, the radiation fin 14f may be formed.
Moreover, as in the first embodiment, all of the through holes 14e, the air holes 15a, and the
heat dissipating fins 14fa may be formed.
[0034]
According to the speaker structure of the present invention, with the above-described structure,
the heat dissipation effect can be sufficiently ensured while the magnetic circuit is disposed in
front of the diaphragm. .
[0035]
Brief description of the drawings
[0036]
1 is a longitudinal sectional view of the speaker showing the speaker structure according to
Embodiment 1 of the present invention.
[0037]
Similarly to FIG. 2, (A) is a cutaway view of the magnetic circuit holding member, and (B) is a
bottom view of the magnetic circuit holding member.
[0038]
3 is a cross-sectional view of the speaker showing the speaker structure according to the second
embodiment of the present invention.
[0039]
4 is a cross-sectional view of the speaker showing a conventional speaker structure.
[0040]
5 shows another conventional speaker structure, and is a cutaway view of the speaker.
[0041]
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Explanation of sign
[0042]
DESCRIPTION OF SYMBOLS 10 ... Speaker 11 ... Diaphragm 12 ... Magnetic circuit 13 ... Voice coil
(voice coil bobbin) 14 ... Magnetic circuit holding member 14a ... Tubular part 14b ... Bearing
surface 14c for magnetic circuit ... Flange part 14d ... Opening 14e ... Through-hole 14f ... Heat
radiation fin 15 ... frame
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