Optical pickup apparatus and a compensation element therefor

Details Optical pickup apparatus and a compensation element therefor Optical pickup apparatus and a compensation element therefor

1998-03-25

2000-04-18

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 58, G11B 700

Patent

active

060523557

ABSTRACT:
An optical pickup for performing a reproduction or recording operation of information on one of different kinds of optical information recording medium, each having a transparent base board in different thickness. The optical pickup includes: a laser beam generator; a light converging optical system for converging luminous flux from the laser beam generator through the transparent base board of the optical information recording medium onto an information recording surface of the optical information recording medium; a changing member for changing an optical path of the luminous flux, being reflected on the information recording surface, to be different from an optical path of the luminous flux, being emitted from the laser beam generator; an photo-detector for detecting the luminous flux being reflected on the information recording surface; and a compensation element, provided between the changing member and the photo-detector, for correcting spherical aberration of the luminous flux.

REFERENCES:
patent: 5748602 (1998-05-01), Chao et al.
patent: 5894464 (1999-04-01), Kim et al.
patent: 5966364 (1999-10-01), Kamatani

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