Optical device with improved focused error detection and tracing

Details Optical device with improved focused error detection and tracing Optical device with improved focused error detection and tracing

1996-11-14

1998-05-19

Neyzari, Ali

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369112, G11B 700

Patent

active

057545030

ABSTRACT:
An optical device for an optical disk drive, for performing focusing error detection and tracking error detection of a laser beam converged on an optical disk. The optical device includes a diffraction grating having first, second, third, and fourth regions for diffracting a reflected beam from the optical disk in different directions. The optical device further includes a first photodetector for detecting a part of the reflected beam diffracted by the first region of the diffraction grating, a second photodetector for detecting a part of the reflected beam diffracted by the second region of the diffraction grating, a third photodetector for detecting a part of the reflected beam diffracted by the third region of the diffraction grating, and a fourth photodetector for detecting a part of the reflected beam diffracted by the fourth region of the diffraction grating. The shape and size of each of the first and second regions of the diffraction grating are optimally controlled to thereby increase a quantity of light incident on the photodetectors for focusing error detection.

REFERENCES:
patent: 5615200 (1997-03-01), Hoshino
patent: 5623462 (1997-04-01), Tesuka et al.
patent: 5638352 (1997-06-01), Yang

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