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JPS5518826

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DESCRIPTION JPS5518826
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a flat type
loudspeaker according to the present invention, and FIG. 1 is a velocity distribution diagram of a
diaphragm at high frequency resonance of the flat type loudspeaker of the prior art. 1 · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · damper, 11 ......
DETAILED DESCRIPTION OF THE INVENTION The present invention is an improvement to the
speaker of the high-pitched high-pitched sound. As shown in FIG. 1, in the case of a flat layer
speaker using vibration 1 [A such as aluminum honeycomb 1 as in the prior art, the highfrequency resonance at the inner portion A ′ viewed from the drive portion of the voice coil B is
very fast. The sound pressure and distortion characteristics are degraded because the size is
increased. Therefore, as a method of eliminating this defect (11S / s // ')-conventionally, the
material of the diaphragm is tightly tightened by 2 and E: elastic modulus, P: density) which is
larger K, high sound Although the reproduction area is divided into two parts and ones having
different diaphragms and different voice coil diameters are used, these methods have the
drawback of being expensive. The present invention is intended to solve the above-mentioned
drawbacks, and by forming a through hole of a predetermined diameter at the center of the
diaphragm, flattening of the sound pressure characteristic, reduction of distortion in high
frequency resonance of the diaphragm, high frequency limit And the phase interference in the
vicinity of the diaphragm is eliminated, and the damping material is filled between the separator
and the through hole of the diaphragm, thereby providing high-resonance KTo provide a flat
loudspeaker designed to reduce Q. The present invention will be described in detail by the
illustrated embodiment. In the figure, the magnetic circuit 1 is formed by the plate 2 and the
magnet 3 and the pole yoke 4 and the driving force is applied by the vibration coil IE7. The edge
8 is a damper, and both hold the center of the vibration system), 9 is one damper (21. The
through hole 10 having a predetermined diameter is formed at the center of the vibration * S, but
if the through hole 10 is too large in diameter, the area of the diaphragm 5 decreases and the
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sensitivity is greatly reduced. Not be practical. Therefore, the decrease in sensitivity is
suppressed to about 0.64 dB according to K if the diameter of the through hole 10 is
experimentally selected to be 0.5 times the diameter of the pois-il. A separator 11 having a
diameter smaller than that of the through hole 10 is embedded in the diaphragm 50 through
hole 10 by the center ball 4. The separator 11 separates the diaphragm 5 in a blue-collapsing
manner to prevent phase interference in the vicinity of the diaphragm 5 or the separator 110 is
formed into a conical body 12 and the vibration 1 [5 to It is also used as an equalizer by letting
out. Between the diaphragm 50 through hole 10 described above and the seventh parator 11 by
filling the damping material 13 which is not permeable to Ka, air leakage from the through hole
10 is prevented, and high-resonance damping is performed to perform Q Restraint. In addition,
as the damping | braking material 13, the non-air-permeable elastic body which made the dump
material impregnate a foam of butyl rubber, or urethane rubber is used.
It should be a turtle. In the present invention, high-pass resonance is suppressed by forming the
through hole 10 having a predetermined diameter at the center of the diaphragm 5 as in the case
of the diaphragm 5, so that the diaphragm 5cJ5 <where E: elastic modulus, P: density) (Djlli The
cost can be reduced without the need for materials. Further, since the span of the outer periphery
and the inner periphery of the diaphragm 5 is smoked when viewed from the drive portion of the
through hole 10), the high frequency band limit frequency can be increased. Furthermore, since
the separator 11 is provided, the reduction of the sound pressure due to the phase interference
in the high region is eliminated, and even if the high frequency resonance is generated by the
damping material 13, the Q can be suppressed. In addition, the separator 11 can improve the
high-frequency characteristic by matching the phase of the sound wave emitted by the cone 12
to the equalizer. Furthermore, since the diaphragm sex is moved by the large diameter die coil 6,
power resistance and sensitivity can be increased.
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