EP 0629334 B1 19960501 - MINIATURE OPTOACOUSTIC TRANSDUCER
Title (en)
MINIATURE OPTOACOUSTIC TRANSDUCER
Title (de)
MINIATURISIERTER OPTOAKUSTISCHER WANDLER
Title (fr)
TRANSDUCTEUR OPTOACOUSTIQUE MINIATURE
Publication
Application
Priority
- FR 9300163 W 19930218
- FR 9202521 A 19920303
Abstract (en)
[origin: FR2688372A1] Transducer comprising a wall (1) delimiting a cavity (3), an output channel (5) crossing the wall (1) and opening into the cavity (3), a light-transmitting member (6) extending through the wall and opening into the cavity (3), the output channel having a diameter and lenght in a ratio forming with the cavity (3) a resonating circuit having a cutoff frequency in the audible sound pass-band.
IPC 1-7
IPC 8 full level
H04R 23/00 (2006.01)
CPC (source: EP)
H04R 23/008 (2013.01)
Designated contracting state (EPC)
BE CH DE ES GB IT LI
DOCDB simple family (publication)
FR 2688372 A1 19930910; FR 2688372 B1 19960105; DE 69302470 D1 19960605; DE 69302470 T2 19961128; EP 0629334 A1 19941221; EP 0629334 B1 19960501; WO 9318628 A1 19930916
DOCDB simple family (application)
FR 9202521 A 19920303; DE 69302470 T 19930218; EP 93905404 A 19930218; FR 9300163 W 19930218