Method of accessing a card shaped recording medium

Details Method of accessing a card shaped recording medium Method of accessing a card shaped recording medium

1992-08-07

1993-12-28

Psitos, Aristotelis

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 58, 369 4432, 235454, G11B 700

Patent

active

052746151

ABSTRACT:
A method of accessing an optical card comprises a first accessing step of making a beam spot projected from an optical head access a target track on the optical card, on those regions of the optical card which are on the outside of ID areas situated on the optical card at its both end portions along an axis of movement of the optical card, a detecting step of detecting whether a tracking error of the beam spot has occurred, following the completion of the first accessing step, and a second accessing step of making, where the tracking error of the beam spot has been detected, the beam spot access the target track on the region on the side opposite to the side where the tracking error has occurred.

REFERENCES:
patent: 4982391 (1991-01-01), Sakagami et al.
patent: 5018124 (1991-05-01), Ogasawara et al.
patent: 5027338 (1991-06-01), Ata
patent: 5042019 (1991-08-01), Kitai et al.

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