Title:
LOW NOISE UNDERWATER MIKE
Document Type and Number:
Japanese Patent JPS52408
Kind Code:
A
Abstract:
PURPOSE: To eliminate noises and electric induction noises due to parallel movement of an underwater mike by forming hollow storage sections so that two piezoelectric elements disposed in the opposite direction of depolarization are probided with an equal drag.
Inventors:
FUKUSHIMA MASATADA
Application Number:
JP7571275A
Publication Date:
January 05, 1977
Filing Date:
June 23, 1975
Export Citation:
Assignee:
HITACHI LTD
International Classes:
H04R1/44; H04R17/02; (IPC1-7): H04R1/44
Domestic Patent References:
| JPS3115204Y1 | ||||
| JPS4027926Y1 |
Next Patent: JPH052409