Light spot position detector

Details Light spot position detector Light spot position detector

1992-01-23

1993-06-01

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4441, G11B 709

Patent

active

052166520

ABSTRACT:
A light spot position detector reliably effects spot-on-track detection even if the reflectivities of recording tracks and intertrack areas of an optical disk are substantially the same as each other. A tracking error signal used to control a scanning spot applied to the recording tracks on the optical disk is produced by mixing light spot position signals that are generated according to the three beam method and the push pull method from light beams reflected from light spots on the signal recording surface of the optical disk.

REFERENCES:
patent: 4787076 (1988-11-01), Deguchi et al.
patent: 5090004 (1992-02-01), Ohsato et al.
patent: 5140577 (1992-08-01), Ohsato
patent: 5148424 (1992-09-01), Wachi
patent: 5155717 (1992-10-01), Bakx
patent: 5159589 (1992-10-01), Ohsato
Patent Abstracts of Japan, vol. 9, No. 334 (P-417), Dec. 27, 1985, & JP60-157737.
Patent Abstracts of Japan, vol. 13, No. 253 (P-883), Jun. 13, 1989 & JP10-50243.

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