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JPS5279873

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DESCRIPTION JPS5279873
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a conventional
ultrasonic ceramic microphone, FIG. 2 is a cross-sectional view of an ultrasonic ceramic
microphone according to an embodiment of the present invention, and FIG. 3 is an exploded
perspective view thereof. . 20: bimorph oscillator, 21, 21 ′: piezoelectric ceramic plate, 22:
support shaft, 23: hole, 24: resonant plate, 25: composite resonator, 26. · Elastic adhesive, 27 · · ·
terminal plate, 28 · · · annular projection, 29. 29 '· · · terminal, 30.30' · · · lead wire, 31 · · · · · · · · · ·
Protection Mesh. Fig. 9-171-開 52-79873 (2) Fig. 2 Fig. 3-172-
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ultrasonic
ceramic microphone using two piezoelectric ceramic plates or a bimorph 11 joint in which a
pressure electromagnetic S plate and a resin plate, a metal plate, and a ceramic plate are
laminated. I am impressed by First, the structure of a conventional ultrasonic ceramic
microphone of this type will be described with reference to FIG. In FIG. 1, 1 is a bimorph
oscillator formed by bonding two piezoelectric ceramic plates 2 and 2 'in opposite directions of
polarization, and 11 is a bonding shaft embedded in the above bimorph oscillator 1. , $ Is a
circular complex 2 made of metal or resin, and the resonator 8 is fixed to the connecting shaft 11
to constitute a composite resonator 4. Reference numeral 6 denotes a terminal plate on which
the terminals 6, 6 'are implanted. The composite resonator 4 is bonded to the terminal plate 6 at
an elastic bonding side 7. 8, 8 'are lead wires respectively connecting the electrodes of the
bimorph vibrator 1 and the terminals e, e', e is a cylindrical case, and the terminal plate 6 has an
opening at one end of the case 9 It is fixed to 10 is a protective net attached to the other part of
the case 1-the opening. However, with the above-mentioned conventional ultrasonic ceramic
microphone, a highly sensitive ultrasonic ceramic microphone having a sharp directional
characteristic can not be obtained. The present invention eliminates the above-mentioned
disadvantages of the prior art, and one embodiment of the present invention will be described
with reference to FIGS. 2 and 3. In FIG. 12 and FIG. 8, 20 is a bimorph oscillator formed by
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bonding 28 piezoelectric ceramic plates 11 and 21 'in opposite directions of polarization, and 22
is a conical support shaft. The lower end portion is attached to a hole 23 provided at the central
portion of the bimorph oscillator 20, and is attached to the other end of the support shaft 22 by
a resonance plate 24 made of metal or resin, or the like. Is configured. The resonance plate 24 is
attached to the support shaft 22 so as to be parallel to the bimorph oscillator 20. The composite
resonator 26 is supported by the elastic adhesive 261 on the hook-like projection 28 of the
terminal plate 27 as well as 29.21! 1 'is a terminal 1, so, so' embedded in the terminal plate 27;
lead wires connecting the terminals 29, 291 and the electrodes of the pie 4A / 7 vibrator 20; 31
is a cylindrical case; The two terminal plates are attached to the open end of -1 of the case 31.
s'm is a protective net attached to the other open end of the case. As described above, according
to the present invention, the space between the bimorph oscillator 20 and the resonance plate 24
is entirely fixed at 1 and the central portions of the bimorph oscillator 20 and the resonance
plate 24 are fixed via the support shaft 2R. Therefore, the deflection vibration of the bimorph
oscillator 2 o is effectively transmitted to the resonance plate 24 by utilizing the competition of
air examination between the bimorph oscillator 20 and the resonance plate 24, and via the
support shaft 2 nitrogenation. Since the connection of the bimorph transducer is transmitted, the
amplitude of the resonance plate 24 is doubled by the combined vibration with the abovementioned standing wave resonance transmission, and a highly sensitive ultrasonic ceramic
microphone is obtained.
In addition, narrow directivity can be provided by performing acoustic conversion by the platelike resonant plate 24, and the application capability of a door switch or the like that performs
signal transmission / reception only in a single direction can be improved. Due to the simple
structure of the complex resonator composed of the resonance transducer 20 and the resonance
plate 24, it is possible to obtain an ultrasonic ceramic microphone which is easy to manufacture
and is inexpensive. The ceramic microphone has the above-described structure, and according to
the present invention, a highly sensitive ultrasonic ceramic microphone having a sharp
directional characteristic is obtained.
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