Optical head tracking error detection device

Details Optical head tracking error detection device Optical head tracking error detection device

1996-09-05

1999-03-23

Tran, Thang V.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4441, 369110, 369112, G11B 709

Patent

active

058869646

ABSTRACT:
To achieve a tracking error detection, a device for use in a simple optical system is disclosed which reduces offset resulting from the lateral movement of an objective lens or a tilt of an information recording medium. The disclosed device maintains the maximum amplitude of a tracking error signal irrespective of variations in track pitch of the information recording medium. The device produces a light beam having substantially-half portions about 180 degrees out of phase with each other, and another light beam which are directed and focused via an objective lens to an information recording medium. The light spots formed by the two light beams are disposed on the information recording medium with a spacing of substantially an integral multiple of the track pitch in the direction perpendicular to the tracks on the information recording medium. Each light beam returning from the information recording medium is received by a pair of split photodetectors, and a tracking error signal is obtained from the difference between the differential outputs.

REFERENCES:
patent: 5329517 (1994-07-01), Yamaguchi et al.
patent: 5373500 (1994-12-01), Tinet
patent: 5519685 (1996-05-01), Kato et al.
G. Bouwhuis et al., Principles of Optical Disc System, Adam Hilger, pp. 72-73 (1985).

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