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JPS53100227

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DESCRIPTION JPS53100227
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view showing a conventional ultrasonic
wave 74 crophone, FIG. 2 is a top view thereof, and FIG. 3 is a side view showing an embodiment
of the ultrasonic wave 74 crophone of the present invention, FIG. 4 is a top view of the same, and
FIG. 5 is a frequency characteristic diagram of an ultrasonic wave 74 crophone of the
conventional old invention. 4 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 и и
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[Detailed description of the invention] The present proposal relates to an ultrasonic microphone
using a piezoelectric polymer film, which measures the improvement of the wave receiving
spectrum and eliminates the disturbance of the frequency characteristic near the high frequency
i resonance. It is intended to be provided. As an ultrasonic l-wave microphone using a
piezoelectric polymer film in the prior art, it was configured as shown in FIG. 1 and FIG. 1)
Compose a piezoelectric upper molecular film 2 as a vibrating film on a metal frame 1 curved so
as to have a curvature radius determined by the lower range resonance frequency ~), and set the
resonance frequency to the ultrasonic range Further, it is necessary to select a small radius of
curvature to 46 to 70 V2, so that the piezoelectric quantity molecular film 2 as a vibrating film
becomes small, and the reception sensitivity is lower than that of the piezoelectric ceramic
microphone. Also, if the back of the piezoelectric polymer film 2 as a vibrating film is filled with
the sound absorbing material 3, the frequency characteristics in the vicinity of the resonance
frequency will be disturbed as shown by the broken line in FIG. It was inappropriate for The
present invention eliminates the above-mentioned conventional drawbacks. Hereinafter, an
embodiment of the present invention will be described with reference to FIGS. 3 to 4 of the
accompanying drawings. A metal frame 4 is curved with a radius of curvature determined by the
high-resonance frequency so as to be concave with respect to the sound wave arrival direction A.
In this frame 4, a piezoelectric polymer film 5 as a vibrating film is used. A sound collecting plate
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6 is provided on both sides of the frame 40 so as to form a paraboloid continuously. The sound
collecting plate 6 is made of metal or synthetic resin, and uses a material having sufficiently
different acoustic impedance from air. The opening 0 with the frame 4 including the sound
collecting plate 6 is determined in consideration of directivity. The frame 4 and the sound
collecting plate 6 can be integrally formed of metal. By thus mounting the sound collectors 6 on
both sides of the frame 4 so as to form a paraboloid, since the wavelength is short in the
ultrasonic region, the sound collection effect by the sound collectors 6 is large, as shown in FIG.
As shown by the solid line, the receiving agency is improved, and the disturbance of the
frequency characteristic is eliminated, and the stable characteristic can be obtained. As described
above, since the ultrasonic microphone of the present invention is structured, it is possible to
improve the wave receiving sensitivity, eliminate ? and disturbance in the vicinity of the
resonance frequency without using a sound absorbing material, and sufficiently serve as a
microphone for remote control. It has the advantage of being available and is a practical value
dog.
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