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:
Oct. 28, 1997
Filed:
Jul. 25, 1989
Marino Giuseppe Carasso, Eindhoven, NL;
Johannes Jacobus Verboom, Eindhoven, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
Disclosed is a record carrier for optically detectable data storage, apparatus for manufacturing such a record carrier and apparatus for recording and/or reproducing information on such a record carrier. The record carrier is provided with periodic track variations whose period corresponds to a frequency for which the power spectrum of the digitally coded information substantially exhibits a zero point. When scanned by a beam of radiation, the periodic track variations produce periodic modulation in the beam of a frequency corresponding to the period of the track variations in order to generate a clock signal of a frequency equal to the bit frequency during recording or reproduction.