Information detection light intensity control apparatus in optic

Details Information detection light intensity control apparatus in optic Information detection light intensity control apparatus in optic

1994-06-07

1996-08-13

Epps, Georgia Y.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 58, G11B 700

Patent

active

055463720

ABSTRACT:
An information detection light intensity control apparatus in an apparatus reproducing information recorded in an optical disc in which a reflectance has a dependency on an incident light intensity, comprising a light source for emitting an information detection light which enters the optical disc and a control system for controlling an intensity of the information detection light which enters the optical disc so that a ratio of an intensity of the information detection light which enters the optical disc and an intensity of the information detection light reflected from the optical disc is set to a predetermined value. According to the information detection light intensity control apparatus, a spot head value of the information detection light is held to the optimum value by coping with an aberration of a fluctuation such as disc tilt, disc thickness variation, or the like or with a sensitivity fluctuation of a super resolution film so that the information recorded in the super resolution optical disc can be stably reproduced.

REFERENCES:
patent: 4051329 (1977-09-01), Blondet et al.
patent: 4937799 (1990-06-01), Hashimoto et al.
patent: 5216660 (1993-06-01), Iimura

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