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EP 0134346 B1 19890531 - ULTRASONIC TRANSDUCERS

Title (en)

ULTRASONIC TRANSDUCERS

Publication

EP 0134346 B1 19890531 (EN)

Application

EP 83304934 A 19830825

Priority

EP 83304934 A 19830825

Abstract (en)

[origin: EP0134346A1] An ultrasonic transducer providing a plurality of different focal lengths within a unitary structure and comprising a piezoelectric element 10 having a curved surface having varying or different radii of curvature with respective sections 10a, l0b, 10c, 10d of the surface providing respective different focal lengths 01,02,03,04. Each section of the curved surface can include electrodes 22 in the form of a Fresnel zone pattern to provide focussing in the orthogonal dimension.

IPC 1-7

G10K 11/32; G10K 11/34

IPC 8 full level

B06B 1/06 (2006.01); G10K 11/32 (2006.01)

CPC (source: EP)

B06B 1/0692 (2013.01); G10K 11/32 (2013.01)

Designated contracting state (EPC)

DE GB NL

DOCDB simple family (publication)

EP 0134346 A1 19850320; EP 0134346 B1 19890531; DE 3379990 D1 19890706

DOCDB simple family (application)

EP 83304934 A 19830825; DE 3379990 T 19830825