JPH03125597U

JPH03125597U -

Info

Publication number: JPH03125597U
Application number: JP3365190U
Authority: JP
Priority date: 1990-03-30
Filing date: 1990-03-30
Publication date: 1991-12-18

Description

[Brief explanation of drawings]

第１図は本考案の一実施例の共振送波器の縦断
面図、第２図ａ，ｂはそれぞれ圧電変換器２の平
面図と正面図、第３図ａ，ｂはそれぞれ弾性板１
２が共鳴管１１の長手方向の中心にあるときと中
心からずれてあるときの本実施例の送波電圧感度
周波数特性を示す図、第４図は本実施例の指向特
性を示す図、第５図は従来の共振送波器の縦断面
図、第６図は第５図の従来の共振送波器２０の送
波電圧感度周波数特性を示す図である。１：共振送波器、２：圧電変換器、１１：共鳴
管、１２：弾性板、１３_１，１３_２：圧電変換素
子、１４：溝、１５_１，１５_２，１５_３，１５_４：圧電アクチユエータ、１６_１，１６_２，１６_３，１６_４：ガイド、１７_１，１７_２：開口部、２
０：共振送波器、２１：共鳴管、２２：弾性板、
２３：圧電変換素子、ｌ_１，ｌ_２，ｌ_３：距離、
ｆ_ｒ０，ｆ_ｒ１，ｆ_ｒ２，ｆ_ｒ３：共振周波数、
Ａ：指向特性。 FIG. 1 is a longitudinal cross-sectional view of a resonant transmitter according to an embodiment of the present invention, FIGS. 2 a and b are a plan view and a front view of a piezoelectric transducer 2, respectively, and FIGS.
2 is a diagram showing the transmission voltage sensitivity frequency characteristics of this embodiment when it is at the center in the longitudinal direction of the resonance tube 11 and when it is offset from the center. FIG. 4 is a diagram showing the directivity characteristics of this embodiment. FIG. 5 is a longitudinal cross-sectional view of a conventional resonant transmitter, and FIG. 6 is a diagram showing the transmission voltage sensitivity frequency characteristics of the conventional resonant transmitter 20 of FIG. 1: Resonant transmitter, 2: Piezoelectric transducer, 11: Resonant tube, 12: Elastic plate, 13 ₁ , 13 ₂ : Piezoelectric conversion element, 14: Groove, 15 ₁ , 15 ₂ , 15 ₃ , 15 ₄ : Piezoelectric actuator, 16 ₁ , 16 ₂ , 16 ₃ , 16 ₄ : Guide, 17 ₁ , 17 ₂ : Opening, 2
0: Resonant transmitter, 21: Resonant tube, 22: Elastic plate,
23: Piezoelectric conversion element, l ₁ , l ₂ , l ₃ : distance,
f _r0 , f _r1 , f _r2 , f _r3 : resonance frequency,
A: Directional characteristics.

Claims

[Claims for Utility Model Registration] A resonant transmitter that generates and radiates sound waves into water, which is a metal having openings at both ends with a length approximately equal to half the underwater wavelength of the sound waves to be generated. an elastic plate provided in the resonance tube near the longitudinal center of the resonance tube and perpendicular to the longitudinal direction so that no gap is created between the resonance tube and the inner wall of the resonance tube; and the elastic plate. A resonant transmitter comprising: bending vibration type piezoelectric transducers fixed to both surfaces of the resonant tube; and a moving mechanism for moving the elastic plate in the longitudinal direction of the resonant tube.