System for calculating focus servo control signal using focus er

Details System for calculating focus servo control signal using focus er System for calculating focus servo control signal using focus er

1992-09-11

1995-01-03

Psitos, Aristotelis

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4425, 369 4411, G11B 700

Patent

active

053792823

ABSTRACT:
A focus servo device for use in an optical disk apparatus including a reproducer for irradiating a light beam emitted from a light source to an optical disk through an objective lens, and detecting an RF signal and a focus error signal on the basis of the return light beam reflected from the optical disk; a maximum-minimum detector for detecting the maximum and the minimum of the RF signal obtained from the reproducer; and a control signal generator for generating a focus servo signal obtained from the reproducer responsive to the maximum and the minimum of the RF signal detected by the maximum-minimum detector. Since the focus servo lock-in control is performed in conformity with the detected maximum and minimum values of the reproduced RF signal, the apparatus is capable of recording information on and/or reproducing the same from any optical disk regardless of the disk's reflectivity.

REFERENCES:
patent: 4677605 (1987-06-01), Abed
patent: 4786794 (1988-11-01), Doi
patent: 4878211 (1989-10-01), Suzuki et al.
patent: 5065386 (1991-11-01), Takeya et al.
patent: 5084849 (1992-01-01), Ishii et al.
patent: 5086420 (1992-02-01), Doi
patent: 5187696 (1993-02-01), Ishii et al.

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