Optical card recording/reproducing apparatus with presetting of

Details Optical card recording/reproducing apparatus with presetting of Optical card recording/reproducing apparatus with presetting of

1994-05-18

1995-09-05

Hajec, Donald

Registers

Coded record sensors

Particular sensor structure

369 32, 369 4426, G06K 710

Patent

active

054480485

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.

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patent: 5293568 (1994-03-01), Oshiba et al.
patent: 5339300 (1994-08-01), Akatsuka et al.

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