Track-lead-in control device for optical head

Details Track-lead-in control device for optical head Track-lead-in control device for optical head

1995-09-19

1997-07-08

Hindi, Nabil

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 4428, G11B 700

Patent

active

056469160

ABSTRACT:
A photosensor receives laser light reflected from an optical disk with a two-segmented photodetecting surface. A relative speed detecting section binarizes a difference signal of output signals of the photosensor, and detects time points when the laser light is located at the centers of tracks and grooves of the optical disk. When a detected interval is longer than a preset value, the relative speed detecting section outputs a speed detection pulse having a preset pulse width. A track detecting section binarizes a sum signal of the output signals of the photosensor, detects time points when the laser light is located at a track edge, and outputs a track detection pulse having a preset pulse width. A loop switch turns on/off a tracking servo loop in accordance with a tracking start signal that is generated by an AND circuit and a D flip-flop.

REFERENCES:
patent: 4731771 (1988-03-01), Maeda et al.
patent: 5191566 (1993-03-01), Yamaguchi et al.
patent: 5216651 (1993-06-01), Hwang
patent: 5327407 (1994-07-01), Suzuki et al.
patent: 5459705 (1995-10-01), Matoba et al.

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