Optical information recording and/or reproducing apparatus and m

Details Optical information recording and/or reproducing apparatus and m Optical information recording and/or reproducing apparatus and m

1995-11-14

1997-05-06

Ben, Loha

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4425, 369 4438, G11B 700

Patent

active

056278136

ABSTRACT:
An optical information recording and/or reproducing apparatus radiates a leading light beam from a first light source and a trailing light beam from a second light source to follow the leading beam onto an information track in a recording medium and to perform recording of information with the leading beam and verification with the trailing beam. The apparatus includes a common photosensor for detecting parts of light quantities of the light beams from the first and second light sources, a device for intermittently turning off the light beam not used for reproduction of preformat portions out of the leading beam and trailing beam, with respect to the preformat portions, and a light output controller for controlling the leading beam from the first light source and the trailing beam from the second light source at respective predetermined light outputs, based on the light quantities detected by the photosensor and reference values preliminarily set, when one of the leading beam and trailing beam is off and when both of the leading beam and trailing beam are on.

REFERENCES:
patent: 4811348 (1989-03-01), Arimoto et al.
patent: 5191204 (1993-03-01), Dickson et al.
patent: 5297128 (1994-03-01), Yamaguchi et al.
patent: 5408453 (1995-04-01), Holtslag et al.
patent: 5493554 (1996-02-01), Sasaki et al.
Patent Abstracts of Japan for publication No. 1-091343, vol. 13, No. 324, Jul. 1989.
Patent Abstracts of Japan for publication No. 1-013242, vol. 13, No. 185, May 1989.

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