Optical disk storage having focus servocontrol system in accorda

Details Optical disk storage having focus servocontrol system in accorda Optical disk storage having focus servocontrol system in accorda

1991-09-24

1994-02-01

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 44350, 369 44410, 369 54, 369116, G11B 7095

Patent

active

052837742

ABSTRACT:
An optical disk storage has a focus servocontrol system in accordance with an astigmatism method. Thus, the optical disk storage uses a cylindrical lens and a photosensor. The optical disk storage corrects an error generated by a light amount distribution offset of an optical beam to be radiated on the photosensor used for the focus servocontrol, so that a normal control signal can be generated and the recording/reproducing performance of the optical disk storage does not deteriorate. The optical disk storage calculates an offset amount between a center of the light amount distribution of the optical beam radiated on the radiation surface of the photosensor and a center of the photosensor.

REFERENCES:
patent: 4819220 (1989-04-01), Miyazaki et al.
patent: 5097458 (1992-03-01), Suzuki
patent: 5142520 (1992-08-01), Yanagi et al.
patent: 5148423 (1992-09-01), Gleim

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