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JPS5693096

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DESCRIPTION JPS5693096
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a cross-sectional view of an embodiment
of an ultrasonic ceramic microphone according to the present invention, and FIG. 2 compares a
conventional microphone with a microphone according to the present invention in terms of
sensitivity-frequency characteristics. FIG. 1 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · Piezoelectric ceramic vibrator, 2 · · · · Metal diaphragm or piezoelectric ceramic
vibrator, · · · · · · Bimorph vibrator, 4 · · · conical resonance Child 4a · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · composite resonators, 7 · · · · · · elastic bonding Agent 8, 8 Terminal plate 9,
10 Input / output terminal 9a, 10a Lead wire 11, Storage container 12, 12 · · · · · · · · · · · · · · · · · · · ·
························································································
· · · · · · · · · · · · · · · · · · · · · · · · · · ·.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ultrasonic
ceramic microphone with improved resonance characteristics. Conventionally, a microphone of
this type is a composite resonator type in which the apex of a conical resonator having a uniform
circular base is fixed to the central portion of a bimorph resonator formed by bonding two
piezoelectric ceramic vibrators. By selecting the radiation diameter, radiation angle, and
thickness of the conical resonator, predetermined acoustic resonance characteristics are adjusted
(1) to 7). However, in order to obtain single-resonance characteristics by these adjustments, it is
necessary to increase the thickness of the conical resonator and to increase the radial diameter,
etc., resulting in an increase in the mass of the conical resonator. And the transmission vibration
between the conical resonator and the bimorph oscillator is damped and the sensitivity is
lowered. In addition, since the base of the conical resonator is formed in a uniform circular
shape, there is a drawback that vibration distortion is easily caused. The present invention was
made to solve the above-mentioned drawbacks, and the base of the conical resonator has a
curved shape or a concavo-convex shape, and the enhancement of sensitivity to only the
resonance characteristic to the required frequency, the broadening of the bandwidth, and the
04-05-2019
1
vibration. An ultrasonic ceramic microphone with reduced distortion. The embodiments will be
described in detail below with reference to the drawings. FIG. 1 shows a cross-sectional view of
an embodiment of an ultrasonic ceramic microphone according to the present invention. A metal
diaphragm or piezoelectric ceramic vibrator 2 is bonded to the piezoelectric ceramic vibrator 1 to
form a bimorph vibrator 3, and the apex 4 a of the conical resonator 4 at the central portion of
the bimorph vibrator 3 (2) coupling axis The base 4b of the conical resonator 4 is formed in a
wave-like curve. The composite resonator 6 composed of the vibrator 3 and the resonator 4 is
attached to the terminal plate 8 through the elastic adhesive 7 and connected to the input /
output terminal 9 ° 10 by the lead wires 9a and 10a. The storage container 11 for storing the
terminal plate 8 and the composite resonator 6 is set to a shape that matches the resonance
characteristics of the composite resonator 6. The screen 12 is for internal protection. The shape
of the base 4b of the conical resonator 4 is not only a wavy curve, but also a concave and convex
curve. Further, the connecting shaft 5 is for facilitating the connection between the conical
resonator 4 and the bimorph oscillator 3 and it is not easy even if it is removed from the
manufacturing point of view. When an alternating current signal is applied to the bimorph
oscillator 3 from the input / output terminals 9 and 10, the bimorph oscillator: 3 performs
flexural oscillation according to the free oscillation mode, and the central portion of the bimorph
oscillator 3 becomes an abdominal portion of oscillation. The conical resonator 4 resonates at a
predetermined frequency due to the vibration of the central portion of the bimorph vibrator 3
and outputs 2 as a device (3) wave.
FIG. 2 shows the sensitivity-frequency characteristics of the composite resonator type ultrasonic
ceramic microphone by comparing the conventional type and the type according to the present
invention. A shows the characteristics of the conventional microphone, and B shows the
characteristics of the shaped microphone according to the present invention. As described above,
according to the configuration of the present invention, since the base 4b of the conical
resonator 4 has a wave-like curved shape, the radiation outer periphery is longer than the
conventional circular shape. As shown, it is possible to obtain an ultrasonic ceramic microphone
capable of suppressing vibration distortion and significantly attenuating high-order resonance,
and satisfying single-resonance type sensitivity-one-frequency characteristics required for
detectors and the like. Further, since the base 4b has a curved shape and the radial outer
periphery is obtained by <1 =, the mass can be reduced with a small cone as compared with the
conventional conical resonator 4 and the vibration between the bimorph oscillator 3 and
Transfer efficiency, and improve the temperature characteristics.
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