Focus error detection with two symmetrically splitted reflected

Details Focus error detection with two symmetrically splitted reflected Focus error detection with two symmetrically splitted reflected

1994-12-29

1997-01-14

Hindi, Nabil

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4423, 369120, G11B 700

Patent

active

055947140

ABSTRACT:
In an optical pickup, a focus error detector for detecting a focus error of an objective lens for an optical disk includes a focusing lens for focusing the reflected light of the optical disk, a diffraction optical device for diffracting the reflected light focused by the focusing lens into two light rays, two bi-segmented photo-detectors for receiving the two split light rays, respectively, and a circuit for outputting a desired focus error signal from the signal detected from the photo-detectors. The circuit outputs a pure focus error signal without errors created by the deviation of the light amount in the photo-detectors due to the tilt or shift of the reflected light, thereby contributing to the stable operation and miniaturization of the optical pickup.

REFERENCES:
patent: 4841508 (1989-06-01), Kimura
patent: 4970710 (1990-11-01), Lee
patent: 4973836 (1990-11-01), Matsuoka
patent: 5161139 (1992-11-01), Inoue et al.
patent: 5465247 (1995-11-01), Kobayashi

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