Optical disc having a high-speed access capability and reading a

Details Optical disc having a high-speed access capability and reading a Optical disc having a high-speed access capability and reading a

1990-02-26

1993-05-25

Richardson, Robert L.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4434, 3692753, G11B 700

Patent

active

052146294

ABSTRACT:
An optical disc for a sample servo type optical disc system. Servo areas disposed periodically on each of tracks of the optical disc are sequentially offset relative to those on the adjacent tracks as viewed in the radial direction by a predetermined distance. An apparatus used for signal read-out from the optical disc comprises a circuit for detecting a servo signal originating in servo pits from a detection signal output from a photodetector, a circuit for generating a clock signal synchronized with the servo signal, a counter for outputting a count value representative of the counted clocks at the timing of the servo signal, and a circuit for generating a light spot velocity signal from the count value.

REFERENCES:
patent: 4779253 (1988-10-01), Getreuer et al.
patent: 4843601 (1989-06-01), Eguchi et al.
patent: 4929917 (1990-05-01), Yokogawa
patent: 4951275 (1990-08-01), Saitoh et al.
"High Speed Access Method of Optical Disk Memory" Optical Memory Symposium, Dec. 18, 1986.
"Sample Access", SPIE, vol. 695, Optical Mass Data Storage II, pp. 160-164, 1986.

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