Optical card having guide patterns for information line position

Details Optical card having guide patterns for information line position Optical card having guide patterns for information line position

1994-09-12

1995-09-19

Hajec, Donald

Registers

Records

235454, 235494, 369 4426, 3692753, G06K 710

Patent

active

054517621

ABSTRACT:
A guide pattern used to position a light spot on a desired information line is formed in each track formed of a plurality of information lines. Light reflected from this guide pattern is converted into electrical signals by a photodetector, and a signal indicating a positional deviation from each information line is generated. A mirror is driven by a piezoelectric element, and a recording light beam is irradiated onto one of the information lines. Information lines traversed are counted on the basis of the positional deviation signal outputted when the information lines are traversed. Positioning on the desired information line is performed on the basis of the counted value.

REFERENCES:
patent: 4885458 (1989-12-01), Horiguchi et al.
patent: 4979159 (1990-12-01), Tsuruoka et al.
patent: 4983819 (1991-01-01), Hashimoto
patent: 5008552 (1991-04-01), Kuramochi et al.
patent: 5132522 (1992-07-01), Oshiba
patent: 5157249 (1992-10-01), Hashimoto et al.

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