Dynamic information storage or retrieval – Information location or remote operator actuated control – Selective addressing of storage medium
Patent
1988-03-11
1991-11-05
Envall, Jr., Roy N.
Dynamic information storage or retrieval
Information location or remote operator actuated control
Selective addressing of storage medium
369 4426, 369 4428, 369 50, 3692573, G11B 7085
Patent
active
050635468
ABSTRACT:
An optical disc having a plurality of information tracks, each information track having a servo field including a pair of wobbled pits and the clock pit. The distance between one of the wobbled pits and the clock pit in each servo field is selected so that the optical disc includes at least three different types of servo field. These different types of servo field appear in a predetermined sequence for every one or more contiguous information tracks. A transducing apparatus for tranducing 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.
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Furukawa Teruo
Ito Osamu
Nakajima Yoshiki
Ogawa Masaharu
Tanaka Kunimaro
Envall Jr. Roy N.
Mitsubishi Denki & Kabushiki Kaisha
Young W. R.
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