Method for reducing lead in time in an optical disk recording or

Details Method for reducing lead in time in an optical disk recording or Method for reducing lead in time in an optical disk recording or

1996-07-01

1998-03-03

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 54, 369 58, G11B 7095

Patent

active

057243255

ABSTRACT:
A method for rapidly implementing the data processing for an optical disk in an optical disk recording or reproducing apparatus capable of reproducing data from multiple types of disks. The method includes the steps of turning on a laser of a pickup device, setting the pickup device at an initial position, and driving a timer; obtaining a minimum tracking error point from an optical disk while vertically moving the pickup device from the initial position to the optical disk at a constant velocity; detecting a thickness of the optical disk from a value of the timer at the time when the minimum tracking error point is obtained and from the constant velocity during the vertical movement of the pickup device; obtaining minimum tracking error points between tracks on the optical disk while horizontally moving the pickup device at a constant velocity, at the time when the minimum tracking error point is obtained; detecting a pitch size between the tracks from a period between the minimum tracking error points and from the constant velocity during the horizontal movement of the pickup device; and discriminating the type of disk from the detected thickness of the optical disk and the detected pitch size between the tracks.

REFERENCES:
patent: 5416758 (1995-05-01), Ito

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