Optical disc with alternating servo patterns and driving apparat

Details Optical disc with alternating servo patterns and driving apparat Optical disc with alternating servo patterns and driving apparat

1990-05-21

1992-07-07

Envall, Jr., Roy N.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4428, 369 54, 3692753, G11B 7085

Patent

active

051289164

ABSTRACT:
An optical disc having a plurality of information tracks, each information track having a servo field including a pair of wobbled pits and a clock pit. The distance between one of the wobbled pits and the clock pit in each servo field is selected such that the optical disc includes at least three different types of servo field. These differnt types of servo field appear in a predetermined sequence for every one or more contiguous information tracks. A driving apparatus for driving such an optical disc has a direction detecting circuit for detecting the moving velocity of a movable portion of an optical head, and a speed detecting circuit for detecting the relative velocity of the movable portion.

REFERENCES:
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patent: 4432083 (1984-02-01), Hsieh et al.
patent: 4443870 (1984-04-01), Hazel et al.
patent: 4674081 (1987-06-01), Gerard et al.
patent: 4779251 (1988-10-01), Burroughs
patent: 4779253 (1988-10-01), Getreuer et al.
patent: 4811135 (1989-03-01), Janz
patent: 4879612 (1989-11-01), Freeze et al.
patent: 4879707 (1989-11-01), Getreuer et al.
Monen, Marinus J., "LD500 Optical Disk Design Overview", SPIE, vol. 695, Optical Mass Data Storage II, 1986, pp. 112-115.
Millar, Ronald et al., "Servo and Clock Sampling in the Optimem 1000", SPIE, vol. 529, Optical Mass Data Storage, 1985, pp. 140-144.

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