Optical information reproducing apparatus

Details Optical information reproducing apparatus Optical information reproducing apparatus

1987-11-24

1989-12-12

Gonzalez, Frank

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

369112, G01J 120

Patent

active

048869597

ABSTRACT:
An optical information reproducing apparatus comprises a photo-detector, a focusing optical system for focusing an information recording plane of a record carrier having a transparent layer on this recording plane to the photo-detector and an optical element for compensating for astigmation caused by the transparent layer to enhance reliability of information reproduction, and the optical axis of the focusing optical system is inclined relative to a normal line to the information recording plane.

REFERENCES:
patent: 4410241 (1983-10-01), de Lang et al.
patent: 4643538 (1987-02-01), Wilson
patent: 4709139 (1987-11-01), Nakamura et al.
patent: 4731527 (1988-03-01), Nomura et al.
patent: 4733065 (1988-03-01), Hoshi et al.
patent: 4742219 (1988-05-01), Ando

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