Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1991-08-05
1994-02-08
McElheny, Jr., Donald E.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4428, 235476, 235494, G11B 700
Patent
active
052854337
ABSTRACT:
In an apparatus for recording and/or reproducing data on and/or from an optical card having a plurality of tracks, each of which includes a data portion and ID portions provided at both ends of the data portion, in said data portion the data is recorded in a plurality of sectors in a reciprocal manner by projecting from an optical head a recording or reproducing light beam onto the optical card, while the optical card is moved with respect to the light beam, a relative position of the optical card with respect to the optical head is detected to derive a sector position signal. A start point of a sector for which the data will be recorded or reproduced is determined by counting the sector position signal. The sector position signal is derived by counting pulses generated by a rotary encoder coupled with the motor for moving the optical card to derive a count value and a comparator for comparing the count value with a reference value which is generated in accordance with a predetermined track format. The sector position signal may be also derived by counting PLL clock pulses which are generated on the basis of a signal obtained by reading PLL synchronizing regions in the ID portion.
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Horiguchi Toshio
Oshiba Mitsuo
McElheny Jr. Donald E.
Olympus Optical Co,. Ltd.
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