Apparatus for recording information on and/or reproducing inform

Details Apparatus for recording information on and/or reproducing inform Apparatus for recording information on and/or reproducing inform

1991-04-04

1993-01-05

Young, Wayne R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4434, 369 54, G11B 7095

Patent

active

051777266

ABSTRACT:
An optical disc such as a magnetooptic disc has information storage tracks each associated with a plurality of pairs of wobble pits arranged therealong. A light beam emitted from a light beam source such as a semiconductor laser is applied as a convergent light beam through an objective lens to the optical disc. A deviation of the light beam from a focused condition on the optical disc is detected as a focus error. A light beam returning from the optical disc is detected by a light detector. When the light beam returns from the wobble pits in each pair, the light detector produces a detected signal with successive peak values corresponding to the wobble pits, and the peak values are averaged. The objective lens is moved along its optical axis by an actuator based on the sum of a signal representing the focus error and a bias which maximizes the absolute value of the average of the peak values from the light detector.

REFERENCES:
patent: 4860271 (1989-08-01), Yokogawa et al.
patent: 4866688 (1989-09-01), Ohtake et al.
patent: 5031166 (1991-07-01), Getreuer et al.
patent: 5034940 (1991-07-01), Saito et al.
patent: 5097458 (1992-03-01), Suzuki
patent: 5099468 (1992-03-01), Suzuki et al.
patent: 5113384 (1992-05-01), McDonald et al.

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