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:
Mar. 29, 1994
Filed:
Oct. 18, 1991
Applicant:
Inventor:
Franz Bigge, Villingen, DE;
Assignee:
Deutsche Thomson-Brandt GmbH, Villingen-Schwenningen, DE;
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03K / ; H03L / ;
U.S. Cl.
CPC ...
307519 ; 307271 ; 307246 ; 328141 ; 331 17 ; 369240 ; 360 7303 ;
Abstract
A regulating circuit for controlling the speed of a rotating disc to provide a constant frequency signal from the disc includes a signal pickup device which moves radially along the disc and provides a velocity signal the frequency of which changes by a factor .DELTA.f as the position of the pickup device on the disc changes. A processor receives the velocity signal and produces a control signal in accordance with the factor .DELTA.f. A change-over switch provides a fine range voltage and a coarse range voltage which are used to control the speed of the disc in a fine range mode and a coarse range mode, respectively.