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:
Nov. 25, 1980
Filed:
Jan. 31, 1979
Gerardus L Jansen, Eindhoven, NL;
Leonardus G Bovee, Eindhoven, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
An optical read apparatus for reading a disc-shaped record carrier. A read element is mounted on an adjusting member by means of which the read element is radially movable. Moreover, there is provided a deflection element for correcting the radial position of the scanning spot. In order to enable an arbitrary information unit on the record carrier to be read with a short searching time, the drive of both the adjusting member and the deflection element is controlled. In order to enable the adjusting member to be moved in a rapid and controlled manner there is provided a position indicator, which indicates the instantaneous radial position of the read element. Moreover, there is included a correction circuit which eliminates the adverse effect of inaccuracies in the position indicator on the searching time.