Title:
ACTIVE COUPLER
Document Type and Number:
Japanese Patent JPS5411717
Kind Code:
A
Abstract:
PURPOSE: To improve sound pressure characteristics with a simple constitution by displacing a high polymer thin-film on the inside wall of a hermetic case forming a hermetic chamber.
Inventors:
SUZUKI AKIRA
Application Number:
JP7619777A
Publication Date:
January 29, 1979
Filing Date:
June 28, 1977
Export Citation:
Assignee:
NIPPON TELEGRAPH & TELEPHONE
International Classes:
H04R19/00; H04R19/02; H04R29/00; (IPC1-7): H04R19/02; H04R29/00
Domestic Patent References:
| JP42001205A | ||||
| JPS4712634A |