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JP2000209694

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DESCRIPTION JP2000209694
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker diaphragm, and more particularly to a means for improving the heat dissipation
characteristics of a diaphragm to which a voice coil is directly fixed.
[0002]
2. Description of the Related Art FIG. 3 shows an example of a speaker using a conventional
diaphragm. The diaphragm 11 shown in the figure extends in a plane from the top to the outside
of the inner peripheral portion having an R shape and is further inclined to be joined to the edge
10 so that the upper and lower plates are combined. The outer periphery of the edge 10 is fixed
to the frame 6.
[0003]
The voice coil 4 is bonded to the inner peripheral surface of the diaphragm 11 with an adhesive
5. The magnetic circuit for applying a magnetic field to the voice coil 4 has a configuration in
which the magnet 7, the center plate 8 of the magnetic body, and the magnet 7 which are
sequentially inserted into the center pole of the frame 6 are fastened by screws 9. The same
poles of the magnets 7 face each other to generate a repulsive magnetic field. The terminal 12
fixed to the frame 6 is connected to the voice coil 4 by a lead wire not shown.
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[0004]
The above-described conventional speaker diaphragm is formed in a flat plate shape, so that the
speaker can be formed thin, but the magnetic circuit is not provided on both sides of the voice
coil. The performance of transferring the heat generated by the voice coil to the magnetic circuit
to dissipate heat is deteriorated, and the heat may be directly transmitted to the diaphragm,
which may burn the diaphragm, and an improvement in safety is required.
[0005]
The diaphragm proposed in Japanese Patent Application Laid-Open No. 6-284499 has a
structure in which a voice coil is directly adhered to the inner periphery and two sheets sandwich
the core material, but a sufficient heat dissipation effect can not be obtained.
[0006]
This invention was made in view of the above-mentioned point, and the place made into the
object aims at the diaphragm for speakers which raised the heat dissipation effect of the
diaphragm which can be formed in flat form and can make a speaker thin. It is to provide.
[0007]
A speaker diaphragm according to the present invention is a speaker diaphragm having a voice
coil fixed to the inner periphery, wherein the height of the honeycomb gradually decreases from
the inner periphery toward the outer periphery. A diaphragm is attached to both sides of the core
of the structure, and the surface of the diaphragm is covered with a metal foil.
[0008]
In the speaker diaphragm, ribs extending radially from the inner periphery are formed on at least
one of the diaphragms attached to both surfaces of the honeycomb structure core.
[0009]
Further, in each of the speaker diaphragms, the height of the inner periphery of the core of the
honeycomb structure is at least higher than the height of the voice coil, and the inner periphery
is also covered with the metal foil.
[0010]
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DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A loudspeaker diaphragm which
is an embodiment of the present invention will be described based on the drawings.
FIG. 1 is a cross-sectional view showing a speaker using a diaphragm according to an
embodiment of the present invention, and FIG. 2 is a plan view showing the same diaphragm.
[0011]
The diaphragm 1 shown in the figure extends from the top to the bottom of the inner periphery
in a planar manner and is bonded to the core 2 so as to sandwich the core 2.
The core 2 is formed of aluminum or the like in a honeycomb structure, and has a shape that
spreads toward the central portion of the diaphragm.
An R-shaped portion 2 a of the height of the voice coil 4 is formed on the inner peripheral
portion of the core 2.
The upper and lower plates of the diaphragm 1 are joined at the outer peripheral portion and
joined to the edge 10.
The outer periphery of the edge 10 is fixed to the frame 6.
In the diaphragm 1, ribs 1a, 1a... Extending radially outward from the central portion are formed.
The upper and lower surfaces of such a diaphragm and the ribs 2 a are covered with an
aluminum foil 3.
[0012]
The voice coil 4 is bonded to the inner peripheral surface of the rib 2 a by an adhesive 5. The
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magnetic circuit for applying a magnetic field to the voice coil 4 has a configuration in which the
magnet 7, the center plate 8 of the magnetic body, and the magnet 7 which are sequentially
inserted into the center pole of the frame 6 are fastened by screws 9. The same poles of the
magnets 7 face each other to generate a repulsive magnetic field. The terminal 12 fixed to the
frame 6 is connected to the voice coil 4 by a lead wire not shown.
[0013]
As described above, since the surface of the diaphragm 1 is covered with the aluminum foil, the
diaphragm itself becomes a heat dissipation body excellent in heat dissipation, and the heat
generated by the voice coil 4 can be efficiently radiated.
[0014]
According to the speaker diaphragm of the present invention, since the heat generated by the
voice coil is efficiently radiated by the diaphragm itself, the input resistance performance and the
safety can be remarkably improved.
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