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:
Aug. 21, 1979
Filed:
Jan. 24, 1978
Masayuki Hongu, Kawasaki, JP;
Sony Corporation, Tokyo, JP;
Abstract
A variable delay device for delaying an electrical signal includes a bar-shaped magnetostrictive member to be a transmitting path of a supersonic wave, an input transducer for converting an electric signal into a supersonic wave and an output transducer for converting a supersonic wave into an electric signal, the input and output transducers being provided at at opposite end portions of the magnetostrictive member, and a magnetic field producing device provided between the input and output transducers for supplying the magnetostrictive member with a magnetic field which varies in intensity along the elongated direction of the magnetostrictive member. The magnetic field supplied to the magnetostrictive member is controlled by a control signal applied to the magnetic field producing device to vary the Young's modulus of the magnetostrictive member. As a result, the velocity of the supersonic wave being transmitted therein is varied, to thereby control the delay time of the electric signal.