The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 16, 1992
Filed:
Dec. 20, 1989
Applicant:
Inventors:
Jean-Pierre Huignard, Paris, FR;
Philippe Defranould, Nice, FR;
Assignee:
Thomson-CSF, Puteaux, FR;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03H / ;
U.S. Cl.
CPC ...
333144 ; 333147 ;
Abstract
A delay device for a frequency signal comprises an element made of acousto-optical material, provided with a first piezo-electric transducer transmitting an acoustic signal in the element and with a second piezoelectric transducer capable of detecting an acoustic wave. A light beam goes through the element and creates a field charge in the element. This charge field plays the role of a reflector for the acoustic wave transmitted by the transducer. By translating the beam along the direction Z, the propagation time of the transmitted acoustic wave is made to vary.