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. 05, 1995
Filed:
May. 18, 1994
Mitsuo Oshiba, Tokyo, JP;
Olympus Optical Co., Ltd., Tokyo, JP;
Abstract
An optical card recording/reproducing apparatus scans a track of an optical card which includes a data portion at a center and ID portions at both ends. Each of the ID portions includes first and second address areas (identical address), a first sync area preceding the first address area, a second sync area between the first and second address areas, a third sync area succeeding the second address, a preamble preceding the first sync area, and a postamble (the preamble and the postamble are identical signals) succeeding the third sync signal. This apparatus comprises a RAM for storing data indicating the start and end points of each ID portion and of each sector with reference to a predetermined position of a track (e.g., the left end of the left ID portion), a counter for counting the relative moving distance of the optical card, and detection circuit for detecting the position of a sector by comparing the output from the counter with the data of the RAM. If a sync area is detected after detection of the preamble, the first address is demodulated. If a sync signal is detected after the demodulated address is error-corrected, data corresponding to the position of the boundary between the third sync signal and the postamble is preset to the counter.