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JP2003299192

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DESCRIPTION JP2003299192
[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 as a coaxial type
composite loudspeaker.
[0002]
2. Description of the Related Art Conventionally, a composite speaker structure in which a
diaphragm for woofer and a diaphragm for tweeter are coaxially arranged is well known as a
speaker structure (e.g. 7-11095).
[0003]
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
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).
[0004]
3 and 4 are cutaway views showing an example of a speaker in which a magnetic circuit is
disposed in front of such a diaphragm, and the speaker shown in FIG. 3 is a so-called external
magnet type, and the speaker shown in FIG. It is an internal magnet type.
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1
[0005]
The speaker 10 shown in FIG. 3 includes the diaphragm 1, the magnetic circuit 2 disposed in
front of the diaphragm 1, the voice coil 4 disposed in the magnetic gap 3 formed by the magnetic
circuit 2 to drive the magnetic circuit 2, and vibration A frame 5 made of sheet metal which holds
the peripheral portion of the plate 1 and a damper 6 which straddles the voice coil 3 and the
frame 5 are provided.
[0006]
The magnetic circuit 2 includes the yoke 7, the magnet 8 and the plate 9, and is disposed in front
of the diaphragm 1 utilizing the space in front of the diaphragm 1, thereby promoting the heat
radiation effect and miniaturizing the speaker 10 as a whole. In addition, it has achieved
thinning.
[0007]
The speaker 20 shown in FIG. 4 includes the diaphragm 11, the magnetic circuit 12 disposed in
front of the diaphragm 111, and the voice coil 14 disposed in the magnetic gap 13 formed by the
magnetic circuit 12 to drive the magnetic circuit 12. A frame 15 made of a sheet metal which
holds the peripheral portion of the plate 11 and a damper 16 which straddles the voice coil 13
and the frame 15 are provided.
[0008]
The magnetic circuit 12 includes a yoke 17, a magnet 18, and a plate 19, and is disposed in front
of the diaphragm 1 utilizing the space in front of the diaphragm 11, thereby promoting the heat
dissipation effect and downsizing the entire speaker 20. In addition, it has achieved thinning.
[0009]
The flow of magnetic flux differs depending on whether the magnets 8 and 18 and the plates 9
and 19 are outside or inside the yokes 7 and 17, respectively.
[0010]
By the way, in the loudspeakers 10 and 20 configured as described above, a composite in which
the magnetic circuit for the woofer and the magnetic circuit for the tweeter are disposed in front
of the diaphragms 1 and 11. It was difficult to make a mold (see FIG. 2 of Japanese Utility Model
Laid-Open Publication No. 7-11095).
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2
[0011]
This is because when the magnetic circuit for the woofer is disposed in front of the diaphragms 1
and 11, the amount of forward projection from the diaphragms 1 and 11 increases, and it is
difficult to make the entire speaker thinner. Do.
[0012]
In order to solve the above problems, the present invention has an object of providing a speaker
structure capable of realizing thinning of the entire speaker while arranging different composite
magnetic circuits in front of the diaphragm. Do.
[0013]
In order to achieve the object, the speaker structure according to claim 1 comprises a magnetic
circuit disposed in front of the diaphragm and having a yoke, a magnet, and a plate, the yoke, and
the yoke. A speaker structure including a voice coil for driving the diaphragm in a magnetic gap
formed by a plate, the second one being located in front of the magnetic circuit and facing the
magnetic circuit with the yoke interposed therebetween; A second magnetic circuit comprising a
diaphragm, the yoke, a second magnet, a second plate, and a yoke disposed on the front of the
magnetic circuit and sandwiching the yoke between the yoke and the second plate And a second
voice coil for driving a second diaphragm in the second magnetic gap.
[0014]
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.
[0015]
(First Embodiment) FIG. 1 shows a speaker structure according to a first embodiment of the
present invention, and is a cross-sectional view of an external-magnetic composite speaker in
which a magnetic circuit is disposed in front of a diaphragm.
[0016]
In FIG. 1, the speaker 30 is disposed in the diaphragm 31, the first and second magnetic circuits
32 and 33 disposed in front of the diaphragm 31, and the magnetic gap 34 formed by the first
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magnetic circuit 32. The voice coil 35 for driving the first magnetic circuit 32, the second voice
coil 37 disposed in the magnetic gap 36 formed by the second magnetic circuit 33 to drive the
second magnetic circuit 33, the diaphragm 31 A frame 38 made of sheet metal holding the
peripheral portion, a damper 39 straddling the voice coil 35 and the frame 38, and a second
diaphragm 40 provided on the second voice coil 37 are provided.
The second diaphragm 40 has a dome shape in the drawing, but may have a cone shape.
[0017]
Here, the diaphragm 31, the first magnetic circuit 32, and the voice coil 35 are used for the
woofer.
Further, the second diaphragm 40, the second magnetic circuit 33, and the second voice coil 37
are used for tweeter.
[0018]
The first magnetic circuit 32 includes a yoke 41, a magnet 42, and a plate 43, and is disposed in
front of the diaphragm 31 using the space in front of the diaphragm 31, thereby promoting the
heat dissipation effect and the entire speaker 30. Has realized the miniaturization and thinning of
the
The arrows in the figure indicate the flow of magnetic flux as the first magnetic circuit 32.
[0019]
The second magnetic circuit 33 shares the yoke 41 of the first magnetic circuit 32, and the
second magnet 44, the second plate 45 are positioned in front of the first magnetic circuit 32,
and the yoke 41 is The first magnetic circuit 32 is disposed at a position (coaxial) opposite to the
first magnetic circuit 32.
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The arrows in the figure indicate the flow of magnetic flux as the second magnetic circuit 33.
[0020]
Thus, in the second magnetic circuit 33, it is not necessary to provide a dedicated yoke by
sharing the yoke 41 with the first magnetic circuit 32, and not only can reduce the number of
parts, but In addition to being able to hold down the amount of forward protrusion of a minute, it
is possible to improve the mountability.
[0021]
(Second Embodiment) FIG. 2 shows a speaker structure according to a second embodiment of the
present invention, and is a cross-sectional view of an internal magnetic composite speaker in
which a magnetic circuit is disposed in front of a diaphragm.
[0022]
In FIG. 2, the speaker 50 is disposed in the diaphragm 51, the first and second magnetic circuits
52 and 53 disposed in front of the diaphragm 51, and the magnetic gap 54 formed by the first
magnetic circuit 52. The voice coil 55 for driving the first magnetic circuit 52, the second voice
coil 57 disposed in the magnetic gap 56 formed by the second magnetic circuit 53 to drive the
second magnetic circuit 53, the diaphragm 51 A frame 58 made of a sheet metal for holding the
peripheral portion, a damper 59 straddling the voice coil 55 and the frame 58, and a second
diaphragm 60 provided on the second voice coil 57 are provided.
The second diaphragm 60 is dome-shaped in the drawing, but may be cone-shaped.
[0023]
Here, the diaphragm 51, the first magnetic circuit 52, and the voice coil 55 are used for the
woofer.
Further, the second diaphragm 60, the second magnetic circuit 53, and the second voice coil 57
are used for tweeter.
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[0024]
The first magnetic circuit 52 includes a yoke 61, a magnet 62, and a plate 63. The first magnetic
circuit 52 is disposed in front of the diaphragm 51 using the space in front of the diaphragm 51,
thereby promoting the heat dissipation effect and the entire speaker 50. Has realized the
miniaturization and thinning of the
The arrows in the figure indicate the flow of magnetic flux as the first magnetic circuit 52.
[0025]
The second magnetic circuit 33 shares the yoke 61 of the first magnetic circuit 52, and the
second magnet 64, the second plate 65 are positioned in front of the first magnetic circuit 52,
and the yoke 61 is It is disposed at a position (coaxial) opposite to the first magnetic circuit 52
across.
The arrows in the figure indicate the flow of magnetic flux as the second magnetic circuit 53.
[0026]
Thus, in the second magnetic circuit 53, by sharing the yoke 61 with the first magnetic circuit
52, there is no need to provide a dedicated yoke, and it is possible not only to reduce the number
of parts, but In addition to being able to hold down the amount of forward protrusion of a
minute, it is possible to improve the mountability.
[0027]
According to the speaker structure of the present invention, by having the above-described
structure, it is possible to reduce the thickness of the entire speaker while arranging different
composite magnetic circuits in front of the diaphragm. It can be realized.
[0028]
Brief description of the drawings
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[0029]
1 is a cross-sectional view of the external magnet type composite speaker showing the speaker
structure according to the first embodiment of the present invention, in which a magnetic circuit
is disposed in front of the diaphragm.
[0030]
2 is a cross-sectional view of an internal magnetic composite speaker showing a speaker
structure according to a second embodiment of the present invention and having a magnetic
circuit disposed in front of the diaphragm.
[0031]
3 is a cross-sectional view of an external-magnet-type speaker in which the conventional speaker
structure is shown and a magnetic circuit is disposed in front of the diaphragm.
[0032]
4 is a cross-sectional view of an internal magnet type speaker in which a magnetic circuit is
disposed in front of the diaphragm, showing the conventional speaker structure.
[0033]
Explanation of sign
[0034]
Reference Signs List 30 speaker 31 diaphragm 32 first magnetic circuit (magnetic circuit) 33
second magnetic circuit 34 magnetic gap 35 voice coil 36 second magnetic gap 37 second voice
coil 40 second Second diaphragm 41 ... yoke 42 ... magnet 43 ... plate 44 ... second magnet 45 ...
second plate
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