EP 1437030 A1 20040714 - AN ELECTRO-ACOUSTIC TRANSDUCER WITH TWO DIAPHRAGMS
Title (en)
AN ELECTRO-ACOUSTIC TRANSDUCER WITH TWO DIAPHRAGMS
Title (de)
ELEKTROAKUSTISCHER WANDLER MIT ZWEI MEMBRANEN
Title (fr)
TRANSDUCTEUR ELECTROACOUSTIQUE DOTE DE DEUX DIAPHRAGMES
Publication
Application
Priority
- DK 0200592 W 20020911
- DK PA200101325 A 20010911
- US 31879801 P 20010911
Abstract (en)
[origin: WO03024151A1] The present invention relates to an electro-acoustic transducer suitable for applications within mobile communication equipment and hearing aids. The transducer comprises two diaphragms positioned on opposite sides of a magnetic circuit having two magnetic gaps. When used as a microphone the transducer is substantially insensitive to vibrations, and when used as a speaker the transducer generates only very low vibration levels. The magnetic circuit has a number of advantages compared to conventional transducers with circular magnetic. The transducer can be made lightweight and with very compact dimensions compared to conventional designs. In a preferred embodiment the diaphragms are rectangular. The transducer may additionally be used as a vibration generator for silent alarm signals.
IPC 1-7
IPC 8 full level
H04R 1/00 (2006.01); H04R 1/02 (2006.01); H04R 7/02 (2006.01); H04R 7/04 (2006.01); H04R 9/00 (2006.01); H04R 9/02 (2006.01); H04R 9/06 (2006.01); H04R 9/08 (2006.01); H04R 25/00 (2006.01); H04R 31/00 (2006.01)
CPC (source: EP)
H04R 9/063 (2013.01); H04R 9/025 (2013.01); H04R 9/046 (2013.01); H04R 25/00 (2013.01); H04R 31/006 (2013.01); H04R 2499/11 (2013.01)
Citation (search report)
See references of WO 03024151A1
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SK TR
DOCDB simple family (publication)
WO 03024151 A1 20030320; CN 1554210 A 20041208; EP 1437030 A1 20040714; JP 2005503091 A 20050127
DOCDB simple family (application)
DK 0200592 W 20020911; CN 02817691 A 20020911; EP 02776891 A 20020911; JP 2003528061 A 20020911