Optical disc apparatus with sensing circuitry to judge a movemen

Details Optical disc apparatus with sensing circuitry to judge a movemen Optical disc apparatus with sensing circuitry to judge a movemen

1997-04-18

1999-05-04

Tran, Thang V.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4434, 369 4441, G11B 700

Patent

active

059011203

ABSTRACT:
An optical disc apparatus which records and reproduces an information signal from an optical disc having land and groove tracks, whose width ratio being set to be 1 or to be a value close thereto, is capable of detecting a moving direction of a beam spot in a random access mode, by applying a four-division or six-division optical sensor, segmented by division lines tilted by 45.degree..+-.25.degree. from the track tangential direction, wherein two output signals having a phase difference of about 90.degree. are produced and the moving direction is detected.

REFERENCES:
patent: 4866687 (1989-09-01), Kasai et al.
patent: 4974220 (1990-11-01), Harada
patent: 5249213 (1993-09-01), Kobunayn
patent: 5311490 (1994-05-01), Matoba et al.

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