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:
Sep. 17, 1991
Filed:
Sep. 28, 1988
Arthur Kurz, Karlsruhe, DE;
Deutsche Thomson-Brandt GmbH, Villingen-Schwenningen, DE;
Abstract
An arrangement for playing back data read out of data tracks on a recorded medium, in which a tracking circuit positions a beam of light on data tracks of the recorded medium. From a photodetector with a plurality of photodiodes, there are generated a data signal, a focusing-error signal, and a tracking-error signal. These signals result from the beam of light that is reflected by the recorded medium onto the photodetector. An offset-compensation voltage is applied to one input of a tracking control amplifier in the tracking circuit. The tracking error signal is generated from photovoltages of predetermined ones of photodiodes. The offset-compensation voltage is varied until one of the photovoltages is equal to the sum of the offset-compensation voltage and of another one of the photovoltages to maintain the operating point of the tracking circuit at an optimal midpoint.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile