Non-linear reflectance optical information recording layer irrad

Details Non-linear reflectance optical information recording layer irrad Non-linear reflectance optical information recording layer irrad

1993-09-10

1995-07-18

Epps, Georgia Y.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369116, 369112, 369283, 369288, 369109, G11B 7095

Patent

active

054348404

ABSTRACT:
Disclosed is an optical disk player capable of suppressing the influence of side lobes of an irradiated spot on the reflected light from an optical disk, thereby ensuring an improved recording/reproducing characteristic. The optical disk player comprises an optical irradiation system for focusing a laser beam as a spot along an information recording portion of an optical disk, and an optical detection system for guiding reflected light from the spot to a photosensor, whereby recorded information is reproduced based on an output signal from the photosensor. The information recording portion is formed of a reflection film whose reflectance increases gradually or stepwise in accordance with an increase in intensity of incident light. The optical irradiation system has an amplitude filter or a phase filter.

REFERENCES:
patent: 5121378 (1992-06-01), Hirose
patent: 5315573 (1994-05-01), Nakao et al.

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