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. 14, 1990
Filed:
Mar. 17, 1988
Toshiaki Tsuyoshi, Hachioji, JP;
Masatoshi Ohtake, Ome, JP;
Wasao Takasugi, Higashiyamato, JP;
Seiji Yonezawa, Hachioji, JP;
Takashi Takeuchi, Fujisawa, JP;
Tadashi Saitoh, Fujisawa, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
In a method of recording/reproducing information associated with an apparatus and recording medium, the medium has an alternate formation including tracks of first regions wherein at least an optical record of preformatted pits at a constant time interval is recorded and second regions in which information is recorded so that optical retrieval can be achieved. A clock signal is generated based on the readout signal of the preformatted pits to record an information signal in the second regions, and the clock signal is retarded and used to read out data pits that are the record of the information in the second regions.