Optical disk drive tracking error detection unit

Details Optical disk drive tracking error detection unit Optical disk drive tracking error detection unit

1996-09-26

1999-04-06

Tran, Thang V.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4441, G11B 709

Patent

active

058927441

ABSTRACT:
A tracking error detecting unit outputs a tracking error signal for two types of optical disks having different recording densities. The tracking error detecting unit includes a diffraction grating for generating first- and second-order beams and a photodetector having detecting sections for receiving zero-, first- and second-order beams to generate reproduced signal, first pair of detected signals and a second pair of detected signals, respectively. The tracking error detecting unit outputs a difference between the first pair of detected signals in the case of a high density disk and outputs the difference between the second pair of detected signals in the case of an ordinary density disk to output a tracking error signal.

REFERENCES:
patent: 5113378 (1992-05-01), Kimura
patent: 5123003 (1992-06-01), Noda et al.
patent: 5138592 (1992-08-01), Fujita
"Optical Disk System" by Asakura-Shoten; date unknown; pp. 44-45.

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