Optical head device and optical information processing apparatus

Details Optical head device and optical information processing apparatus Optical head device and optical information processing apparatus

1998-02-04

2000-07-18

Edun, Muhammad

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 94, 369 4435, G11B 709

Patent

active

060916907

ABSTRACT:
An optical head apparatus comprises: a light source for emitting light; a front-end converging optical system for converging the light emitted from the light source onto a multi-layer information storage medium; a back-end converging optical system for reconverging the light reflected from a layer on the multi-layer information storage medium; wavefront converting means for accepting the reconverged light, and for forming an wavefront to enable detection of a focus error signal and/or a tracking error signal; and a photodetector for receiving the light from the wavefront converting means, and for outputting a signal proportional to the amount of the received light.

REFERENCES:
patent: 5754512 (1998-05-01), Komma et al.
patent: 5802037 (1998-09-01), Lee et al.
patent: 5867468 (1999-02-01), Mori et al.

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