Focus control method, and optical disk unit with focus offset co

Details Focus control method, and optical disk unit with focus offset co Focus control method, and optical disk unit with focus offset co

1996-04-01

1999-10-19

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 54, G11B 7095

Patent

active

059700327

ABSTRACT:
A focus control method controls a focus servo system which controls a focus of a light irradiated on an optical disk in an optical disk unit which has a plurality of operation modes. The focus control method includes the steps of (a) reading focus offset information from a memory which prestores focus offset information depending on the operation modes of the optical disk unit, and (b) controlling the focus with respect to the optical disk by supplying the focus offset information read in the step (a) to the focus servo system when the operation mode of the optical disk unit is switched from one mode to another.

REFERENCES:
patent: 4707648 (1987-11-01), Minami
patent: 4942564 (1990-07-01), Hofer et al.
patent: 5077719 (1991-12-01), Yanagi et al.
patent: 5097458 (1992-03-01), Suzuki
patent: 5142520 (1992-08-01), Yanagi et al.
patent: 5251194 (1993-10-01), Yoshimoto et al.

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