EP 0308931 B1 19931208 - Ultrasonic transducer with astigmatic transmission-reception characteristics.
Title (en)
Ultrasonic transducer with astigmatic transmission-reception characteristics.
Title (de)
Ultraschallwandler mit astigmatischer Sende-/Empfangscharakteristik.
Title (fr)
Transducteurs à ultrasons avec une caractéristique d'émission et de réception astigmatique.
Publication
Application
Priority
DE 3732412 A 19870925
Abstract (en)
[origin: EP0308931A2] Transducer whose astigmatic directional characteristic is based on radially non-symmetrical rigidity or sound velocity of the material of the oscillating diaphragm (2) which consists of a fibre composite material. <IMAGE>
IPC 1-7
IPC 8 full level
H04R 17/00 (2006.01); G10K 9/122 (2006.01); G10K 13/00 (2006.01)
CPC (source: EP US)
G10K 9/122 (2013.01 - EP US); G10K 13/00 (2013.01 - EP US)
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
EP 0308931 A2 19890329; EP 0308931 A3 19900321; EP 0308931 B1 19931208; DE 3732412 A1 19890413; DE 3886154 D1 19940120; JP H01119199 A 19890511; US 4907207 A 19900306
DOCDB simple family (application)
EP 88115593 A 19880922; DE 3732412 A 19870925; DE 3886154 T 19880922; JP 23866288 A 19880922; US 24928188 A 19880926