EP 1152638 A1 20011107 - OPTICAL MICROPHONE ELEMENT AND OPTICAL MICROPHONE
Title (en)
OPTICAL MICROPHONE ELEMENT AND OPTICAL MICROPHONE
Title (de)
OPTISCHE MIKROFONEINHEIT UND OPTISCHES MIKROFON
Title (fr)
ELEMENT DE MICROPHONE OPTIQUE ET MICROPHONE OPTIQUE
Publication
Application
Priority
- JP 0007162 W 20001016
- JP 29422199 A 19991015
Abstract (en)
An optical microphone element comprising a diaphragm (31) vibrating with sound pressure, a case (40) containing the diaphragm (31) and having first and second openings (38, 39) made in symmetric positions and facing the diaphragm (31), a light source (32) for irradiating the diaphragm (31) with a light beam, and a photodetector (35) for receiving the light beam reflected by the diaphragm (31) and outputting a signal corresponding to vibration of the diaphragm (31). <IMAGE>
IPC 1-7
IPC 8 full level
H04R 23/00 (2006.01); H04R 25/00 (2006.01)
CPC (source: EP)
H04R 23/008 (2013.01); H04R 25/402 (2013.01)
Citation (search report)
See references of WO 0128286A1
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
WO 0128286 A1 20010419; EP 1152638 A1 20011107; JP 2001119796 A 20010427
DOCDB simple family (application)
JP 0007162 W 20001016; EP 00966509 A 20001016; JP 29422199 A 19991015