LANGEVIN TYPE OSCILLATOR AND ACTIVE SONAR EQUIPPED WITH LANGEVIN TYPE OSCILLATOR

摘要

PROBLEM TO BE SOLVED: To provide a Langevin type oscillator capable of adjusting frequency characteristics of the sound pressure of ultrasonic waves radiated from the Langevin type oscillator by changing neither the dimension, shape, and quality of material of the whole of a Langevin type oscillator nor the dimension, shape, and quality of material of each component constituting the Langevin type oscillator.;SOLUTION: A Langevin type oscillator 10 of this invention comprises: piezoelectric oscillators 21,...,2N and electrodes 31,...,3(N+1) that form an oscillator 70 by being interlaminated; a front mass 40 that clamps the oscillator 70; a rear mass 50 and a bolt 60, where a piezoelectric oscillator 2k keeps piezoelectric material 2ka and insulating materials 2kb alternately arranged circumferentially and arranged to be rotatable between the electrodes 3k and 3(k+1), and where the electrode 3k keeps conductive members 3ka and insulating members 3kb alternately arranged circumferentially.;SELECTED DRAWING: Figure 1;COPYRIGHT: (C)2017,JPO&INPIT