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JPS6051100

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DESCRIPTION JPS6051100
[0001]
The present invention relates to a flat plate diaphragm configured by bonding surface materials
to upper and lower surfaces of a core material having a honeycomb structure, and a flat plate
speaker using a flat plate vibrating plate made of foamed resin, in resonant mode of the flat plate
vibrating plate. It is intended to drive the resulting nodes to obtain excellent characteristics.
Conventionally, as a flat speaker using a flat diaphragm, as shown in FIG. 1, a frame 2 is provided
with a magnetic circuit 5 formed of a plate 2 having a center pole 1, a ring magnet 3 and a ring
top plate 4 as well. 6 is joined, an edge 7 is joined to the periphery of the frame 6, a flat
diaphragm 8 is attached to the edge 7, a cone-shaped connecting member 9 is joined to the lower
surface of the flat diaphragm 8, and the connecting member The voice coil 10 is coupled to the
central portion of 9, and the middle portion of the voice coil 10 is held by the damper 11, and
the lower portion of the voice coil 1o is fitted into the magnetic gap 12 of the magnetic circuit 5;
This flat plate speaker is configured in the case where the aperture of the flat plate diaphragm 8
is large, and a connecting portion is formed at a node portion generated in a resonant mode of
the flat plate diaphragm 8 having a diameter larger than the aperture of the voice coil 1o. It is
bound to 9. As described above, when the diameter of the flat diaphragm 8 is large, the voice coil
10i with a large diameter can be used and magnetic saturation does not occur at the center pole
1 portion of the magnetic circuit 5, but a small diameter flat diaphragm is used. In the case of
driving at a constant torque, the diameter of the nodal circle of the flat diaphragm also becomes
small, and in order to achieve high efficiency, it is necessary to take large magnetic energy and to
saturate at the root of the center pole 1 Although it is necessary to increase the saturation
magnetic density using a membrane, pure iron or the like, there is a limit in selecting the material
alone, and there is a disadvantage that the cost is disadvantageous. The present invention
eliminates the above-mentioned conventional defects, improves the connecting member between
the voice coil and the flat plate diaphragm, and enables high-efficiency node driving even when
12-05-2019
1
using a small diameter flat plate moving plate. To try to Hereinafter, an embodiment of the
present invention will be described with reference to FIG. 2 and FIG. A magnetic circuit 13
comprises a plate 16 having a center pole 14, a ring-shaped magnet 16, and a ring-shaped upper
plate 17. A frame 18 is coupled to the magnetic circuit 13. The peripheral edge of the edge 19 is
bonded to the outer peripheral edge of the frame 18 by bonding or the like, and the flat
diaphragm 20 is bonded to the inner peripheral edge of the edge 19 by bonding or the like. The
flat diaphragm 20 may be formed by sticking a surface material on the upper and lower surfaces
of a honeycomb structure core material, or may be a foamed resin molded into a flat plate.
A connecting member 21 in the form of a truncated cone having a smaller diameter at the upper
side is connected to the lower surface of the flat diaphragm 20, and a voice coil 22 is connected
to the lower large diameter portion of the connecting member 21. The lower part of the voice
coil 22 is embedded without being biased to the magnetic gap 24 of the magnetic circuit. With
such a configuration, the aperture diameter of the voice coil 22 can be made smaller by the
inverted truncated conical connection member 21 even if the aperture diameter of the flat
diaphragm 20 is small and the inner diameter of the node due to the resonance mode is reduced.
. Therefore, the diameter of the center pole 14 of the magnetic circuit 13 can also be enlarged,
and magnetic saturation does not occur near the root of the center pole 14, and the magnetic
energy of the magnetic circuit 13 can be made large, which is highly efficient. As such, it is not
necessary to use a high magnetic permeability and cost material for the plate 16 with the center
pole 14. It is also possible to integrally form the connecting member 21 and the coil bobbin 22a
of the voice coil 22 as shown in FIG. As described above, the flat speaker of the present invention
can drive the node portion generated in the resonance mode of the flat diaphragm by the voice
coil with the large aperture, even if the flat diaphragm with the small aperture is used. By using a
large-diameter one, magnetic saturation does not occur near the center pole fence plate as a
magnetic circuit, and it is possible to make a large magnetic energy, to be a highly efficient
speaker, and of practical value. It is big.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a half sectional view of a conventional flat panel loudspeaker, FIG. 2 is a half sectional
view showing one embodiment of the flat panel loudspeaker of the present invention, and FIG. 3
is a half sectional view of a voice coil of another embodiment.
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2
13 иии Magnetic circuit, 14 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
upper plate, 18 и и и и frame, 19 ...... edge, 20 ...... flat diaphragm, 21 ...... connecting member, 22 ...
... voice coil, 2 early ...... Danno <-124 и и и и и и и и и Magnetic gap.
12-05-2019
3
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