Focus servo pull-in apparatus for use in a compatible disk playe

Details Focus servo pull-in apparatus for use in a compatible disk playe Focus servo pull-in apparatus for use in a compatible disk playe

1997-07-29

1999-10-12

Huber, Paul W.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 58, G11B 700, G11B 390

Patent

active

059663553

ABSTRACT:
A focus servo pull-in apparatus which discriminates the type of an optical disk and executes focus servo from the optimal position according to the disk type. This focus servo pull-in apparatus performs a focus servo pull-in control operation at the time of reproducing information from one of at least two types of recording media with different distances from surfaces of the recording media to information recording planes where information is recorded. The apparatus comprises a light-emitting unit for irradiating a light beam on an information recording surface of a recording medium in use, a light-receiving unit for receiving reflected light of the light beam from the information recording surface, a moving unit for moving an objective lens for directing the light beam to a focus, in a direction parallel to an optical axis of the light beam, a discrimination unit for discriminating a type of the recording medium in use and outputting a discrimination signal, and a control unit for performing different pull-in controls in accordance with the discrimination signal.

REFERENCES:
patent: 5289451 (1994-02-01), Ashinuma et al.
patent: 5526336 (1996-06-01), Park et al.
patent: 5659533 (1997-08-01), Chen et al.

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