Device for opening and closing a tracking servo loop of an optic

Details Device for opening and closing a tracking servo loop of an optic Device for opening and closing a tracking servo loop of an optic

1996-10-02

1998-07-07

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4435, G11B 7095

Patent

active

057779635

ABSTRACT:
A servo control device for controlling operation of tracking servo loop includes: on-track signal generating unit for generating on-track signal indicating whether a light beam irradiated on an optical disk is positioned on track of the optical disk or not, on the basis of the light beam reflected by the optical disk; tracking error signal generating unit for generating tracking error signal on the basis of the light beam reflected by the optical disk; discriminating unit for discriminating whether the light beam irradiated on the optical disk is positioned in pre-pit area or not; holding unit for holding value of the on-track signal immediately before entrance of the light beam to the pre-pit area on the basis of discrimination result of the discriminating unit; and control unit for opening and closing the tracking servo loop in accordance with the value of the on-track signal held by the holding unit and the tracking error signal.

REFERENCES:
patent: 4661942 (1987-04-01), Yoshimoto et al.

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