JPS599694U

JPS599694U - ultrasonic ceramic microphone

Info

Publication number: JPS599694U
Application number: JP10336482U
Authority: JP
Inventors: 宇都宮　良一
Original assignee: 松下電器産業株式会社
Priority date: 1982-07-07
Filing date: 1982-07-07
Publication date: 1984-01-21

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

一第１図は本考案の超音波セラミックマイクロホン−実
施例を示す断面図、第２図は本考案のマイクロホン構造
のうち、複合共振子の振動モードと放射音波の位相の位
相の分布状態を示した図であ名。第３図は本考案超音波
セラミックマイクロホンと従来の超音波セラミックマイ
クロホンの感度、周波数特性を示したグラフａ及び指向
特性を示したグラフｂである。特性図中の実線は、本考
案のマイクロホン、破線は従来のマイクロホンである。第４図は従来例の超音波セラミックマイクロホンを示す
断面図である。１・・・圧電磁気振動子、２・・・バイモルフ振動子、
３・・・付加共振子、４・・・端子板、５．１２・・・
弾性接着剤、６・・・金属ベース、７・・・ケース、１
０・・・共鳴板、ｉｏａ・・・連結部。　　　　　　１
、　　　　　　　　　゛第３図第４図Figure 1 is a sectional view showing an embodiment of the ultrasonic ceramic microphone of the present invention, and Figure 2 shows the phase distribution of the vibration mode of the composite resonator and the phase of the radiated sound wave in the microphone structure of the present invention. Name with a diagram. FIG. 3 is a graph a showing the sensitivity and frequency characteristics of the ultrasonic ceramic microphone of the present invention and a conventional ultrasonic ceramic microphone, and a graph b showing the directivity characteristics. The solid line in the characteristic diagram represents the microphone of the present invention, and the broken line represents the conventional microphone. FIG. 4 is a sectional view showing a conventional ultrasonic ceramic microphone. 1... Piezomagnetic oscillator, 2... Bimorph oscillator,
3...Additional resonator, 4...Terminal board, 5.12...
Elastic adhesive, 6... Metal base, 7... Case, 1
0...Resonance plate, ioa...Connection part. 1
, ゛Figure 3Figure 4

Claims

[Scope of utility model registration request]

A composite resonator comprising an additional resonator made of synthetic resin in the shape of an inverted truncated cone provided in the upper central part of a bimorph resonator, a support for elastically supporting and installing the composite resonator, and the composite resonator and the support. In an ultrasonic ceramic microphone consisting of a case that houses the body, the ultrasonic transmission and
An ultrasonic ceramic microphone characterized in that a resonance plate having an outer diameter smaller than the fundamental vibration mode diameter of the bimorph oscillator is adhesively fixed to a wave receiving surface via a connecting portion integrally molded with the resonance plate.