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JPS58119297

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DESCRIPTION JPS58119297
[0001]
The present invention relates to a flat speaker that uses a flat diaphragm and drives a node
portion at a primary resonance frequency of the flat diaphragm. The conventional flat speaker is
configured as shown in FIG. That is, the stepped frame 6 is coupled to the ring-shaped magnet 3
on the plate 2 having the center pole 1 and the magnetic circuit 6 similarly constituted by the
ring-shaped upper plate 4, and the frame 7 has a gasket 7. At the same time, the edge 9 attached
to the peripheral edge of the flat diaphragm 8 is bonded by bonding or the like, and the voice coil
1o is coupled to a portion of the lower surface of the flat diaphragm 8 which becomes a node by
the primary resonance frequency. The lower portion of the magnetic circuit 5 is fitted into the
magnetic gap 11 of the magnetic circuit 5 described above. In such a configuration, the position
where the voice coil 10 is attached to the flat plate diaphragm 8 is set at a position of 0.6R of a
radius R of a node of the primary resonance frequency, that is, the normal plate diaphragm 8.
However, the specific elastic modulus as the flat diaphragm 8. If the material A ░ of the flat plate
diaphragm 8 or the edge 9 changes due to the variation of the mass or the like, the circle
diameter of the node changes. From this point of view, the characteristic correction piece 12 is
attached to the center of the lower surface of the flat diaphragm 8, but its sound pressure
frequency characteristic is disorder such as peak or dinope at the frequency fx as shown by the
solid line in FIG. Was occurring. In the prior art, the height and outer diameter of the frame 6 are
configured in consideration of the appearance balance in consideration of the amplitude of the
flat plate moving plate 8, the diameter of the flat plate diaphragm 8 and the like. As described
above, the present invention is intended to eliminate the conventional defects, and a flat speaker
exhibiting stable sound pressure frequency characteristics stable even if there are variations in
the mass and specific elastic modulus of the flat plate diaphragm and further changes in the
material etc. The purpose is to provide In order to achieve the above object, the present invention
combines a voice coil so as to drive a flat diaphragm in a joint manner, and measures the
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dimension from the joint of the voice coil to the outer diameter of the frame for fixing the edge of
the flat diaphragm. It is characterized in that the wavelength of the primary resonance frequency
is set to be smaller, and the height of the frame is set to be equal to or less than the wavelength
of the primary resonance frequency. Hereinafter, an embodiment of the present invention will be
described with reference to FIG. 2 and FIG. First, in FIG. 2, reference numeral 12 denotes a
magnetic circuit constructed by introducing a ring-shaped magnet 15 and a top plate 16 on a
plate 14 having a center pole 13. A ring-shaped frame 18 with a part 17 is mounted.
The peripheral edge of the edge 21 joined to the peripheral edge of the edge 21 joined to the
peripheral edge of the flat diaphragm 20 together with the gasket 19 is joined to the stepped
portion 1 of the frame 18 by bonding or the like. The voice coil 22 is coupled to a portion of the
lower surface of the flat plate diaphragm 2o which forms a nodal circle by the primary resonance
frequency, and the lower portion of the voice coil 22 is fitted into the magnetic gap 23 of the
magnetic circuit 12 without eccentricity. . Further, the dimension A from the position where the
voice coil 22 is coupled to the outer peripheral portion of the frame 18 is configured to be A =-.
Cndot. So as to be equal to the% wavelength of the primary resonance frequency fx. FxV is the
speed of sound. Furthermore, the height B of the frame 18 is configured to be equal to or less
than the% wavelength of the primary resonance frequency fx, that is, B <-. By setting the
dimensions of the frame 18 in this manner, the sound waves emitted from the flat plate
diaphragm 20 are attenuated by reflection in the space formed on the lower surface of the flat
plate diaphragm 2o. In particular, the nodal diameter of the flat plate diaphragm 20 due to the
primary resonance frequency changes due to the variation of the specific elastic modulus and the
mass of the flat plate diaphragm 2 o and the change of the material of the flat plate diaphragm 2
o and the edge 21. Can be effective, and its sound pressure frequency characteristics can be flat
force as shown by the broken line in FIG. As described above, since the flat speaker of the
present invention is configured, the joint circle at the primary resonance frequency of the flat
plate diaphragm changes the specific elastic modulus and mass of the flat plate diaphragm, and
the material of the flat plate diaphragm and the edge Even if it fluctuates, the sound pressure
frequency characteristics can be made flat without sticking of the characteristic correction piece
by the size configuration of the frame, and it has the advantage that high fidelity reproduction
becomes possible, industrially It is of great value.
[0002]
Brief description of the drawings
[0003]
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2
FIG. 1 is a cross sectional view showing a conventional flat loudspeaker, FIG. 2 is a cross sectional
view showing one embodiment fIJ of the flat loudspeaker according to the present invention, and
FIG. 3 is a sound pressure frequency characteristic diagram of the conventional flat loudspeaker
according to the present invention. .
12 ...... magnetic circuit, 13 ииииии center ball, 14 ...... flop V- DOO, 15 ...... magnet, 16 ░░. и и и Upper
plate, 17 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 20 и и и и и и и и и flat plate, 21
и и и иииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии ... Magnetic gap 0
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