Focus control device and method for use in multilayer optical di

Details Focus control device and method for use in multilayer optical di Focus control device and method for use in multilayer optical di

1997-10-28

1999-10-26

Edun, Muhammad

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4427, 369 4425, 369 94, 2502015, G11B 709

Patent

active

059740094

ABSTRACT:
In making a layer jump or focus search on a multilayer optical disk having two or more signal recorded layers, an objective lens is moved in a focusing direction to focus a laser beam onto a desired signal recorded layer with focus servo kept OFF. Based on the number of times a focus error signal having an S-shaped characteristic obtained as a result of driving the objective lens exceeds a predetermined voltage level, arrival at the desired signal recorded layer is determined. In this state, the focus servo is made active at the time when the focus error signal first goes to the 0 level.

REFERENCES:
patent: 5263011 (1993-11-01), Maeda et al.
patent: 5682372 (1997-10-01), Yamakawa et al.

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