Reading system for a control track of an optical disk

Details Reading system for a control track of an optical disk Reading system for a control track of an optical disk

1989-11-29

1992-06-23

Envall, Jr., Roy N.

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 54, 369 4434, 369 4411, 369 4428, G11B 712

Patent

active

051249626

ABSTRACT:
The control track of the optical disk is scanned by an optical pick-up. Data and clock are detected from the signal obtained by above scanning, and the missing state of the clock is further detected. In addition, the shifting direction relative to the control track of the optical pick-up is detected. When data indicates an error and the clock includes a large missing portion, the optical pick-up is shifted in a direction opposite to the shifting direction thereof. In the case where there is no shifting direction signal, the optical pick-up is shifted in a fixed direction. Such an operation is repeated until no shift is detected. In an alternative implementation, the control track of the optical disk is scanned by the optical pick-up. Data and clock are detected from the signal obtained by above scanning, and the missing state of the clock is further detected. When data indicates an error and the clock includes a large missing portion, the optical pick-up is shifted in a fixed direction. Thereafter, the width of the missing portion of the clock is detected. The optical pick-up is shifted in a direction opposite to the above when the missing width is widened and in the same direction as the above when the missing width is narrowed. Such an operation is repeated until no shift is detected.

REFERENCES:
patent: 4924455 (1990-05-01), Fujiie et al.
patent: 4982392 (1991-01-01), Soejima
patent: 5023855 (1991-06-01), Kobayashi et al.
patent: 5038334 (1991-08-01), Uchikoshi et al.

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