Focus servo apparatus for multi-layer disc and method for operat

Details Focus servo apparatus for multi-layer disc and method for operat Focus servo apparatus for multi-layer disc and method for operat

1997-10-15

2000-12-19

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 54, G11B 7085

Patent

active

06163512&

ABSTRACT:
A focus servo apparatus for a multi-layer disc includes a focus driving unit for outputting a driving signal for performing a focus jump operation of pulling in a pick-up and moving a focus of the pick-up, a level holder for maintaining a driving signal level of the driving signal from the focus driving unit corresponding to a focus position when the focus of the pick-up is positioned at a corresponding data surface of a disc, an adder for adding the driving signal from the level holder and a driving signal from a main focus servo unit, and a switch for selectively outputting the driving signal of the main focus servo unit when the pick-up is pulled-in and an output signal from the adder when the focus of the pick-up is positioned at the data surface of the disc. The improved focus servo apparatus is capable of carrying out a stable focus servo operation by incorporating the level holder and a focus jump function.

REFERENCES:
patent: 4740679 (1988-04-01), Doi
patent: 4878211 (1989-10-01), Suzuki et al.
patent: 5010538 (1991-04-01), Takeda et al.
patent: 5060215 (1991-10-01), Kawamura et al.
patent: 5187696 (1993-02-01), Ishii et al.
patent: 5202871 (1993-04-01), Yokota
patent: 5745450 (1998-04-01), Miyazono

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