Optical apparatus for effecting recording and/or reproducing of

Details Optical apparatus for effecting recording and/or reproducing of Optical apparatus for effecting recording and/or reproducing of

1992-05-11

1993-03-16

Psitos, Aristotelis

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4423, 2502015, G11B 700, G01J 120

Patent

active

051950812

ABSTRACT:
Disclosed is a device for reproducing information from an information recording medium having, on its information recording surface, a surface layer transmitting light therethrough. The information reproducing device includes a light source generating an illuminating light beam, a photodetector for receiving light from the information recording medium illuminated by the light beam from the light source, information reproduction being effected by the result of the detection by the photodetector, and an illuminating optical system for condensing the light beam from the light source and for directing it onto the information recording medium, the position of the condensing point by the illuminating optical system being spaced apart from the information recording surface of the information recording medium during the information reproduction by the detection by the photodetector.

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patent: 4886959 (1989-12-01), Hoshi et al.
patent: 4900910 (1990-02-01), Doi

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