EP 1038290 B1 20040128 - ULTRASONIC TRANSDUCER WITH A CUP-SHAPED SUPPORT
Title (en)
ULTRASONIC TRANSDUCER WITH A CUP-SHAPED SUPPORT
Title (de)
ULTRASCHALLWANDLER MIT TOPFÖRMIGER HALTERUNG
Title (fr)
TRANSDUCTEUR ULTRASONORE A SUPPORT CUPULIFORME
Publication
Application
Priority
- DE 9803297 W 19981103
- DE 19754891 A 19971210
Abstract (en)
[origin: WO9930313A1] Disclosed is an ultrasonic transducer that can be used as a transmitter and a receiver in pulse echo applications, especially in automobiles, to detect objects inside the automobile, i.e. for controlling air bag ignition during an accident. The inventive ultrasonic transducer comprises a membrane (2) with a piezoelectric plate (3) on the back thereof. The diameter of the piezoelectric plate (3) is 60 % -85 % the diameter of the membrane (2). A material (4) made of a soft open cell material is foamed on the back of the main surface of the membrane (2). Advantageous features with respect to the sensitivity and the mechanical quality of the transducer are obtained by foaming said material. The cited ratio between the diameter of the piezo ceramic element (3) and the membrane (2) provides a large aperture angle of the sound radiation when said foamed material is used.
IPC 1-7
IPC 8 full level
G10K 9/122 (2006.01); H04R 17/00 (2006.01)
CPC (source: EP)
G10K 9/122 (2013.01)
Citation (examination)
US 4437032 A 19840313 - GELHARD EGON [DE]
Designated contracting state (EPC)
DE FR GB NL
DOCDB simple family (publication)
WO 9930313 A1 19990617; DE 19754891 C1 19990715; DE 59810685 D1 20040304; EP 1038290 A1 20000927; EP 1038290 B1 20040128; JP 2001526479 A 20011218
DOCDB simple family (application)
DE 9803297 W 19981103; DE 19754891 A 19971210; DE 59810685 T 19981103; EP 98962245 A 19981103; JP 2000524787 A 19981103