Optical information recording/reproducing apparatus

Details Optical information recording/reproducing apparatus Optical information recording/reproducing apparatus

1988-09-22

1991-04-09

Levy, Stuart S.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369121, 369124, G11B 7125

Patent

active

050070398

ABSTRACT:
An optical information recording/reproducing apparatus includes signal recording means for recording a signal on a film. The signal is recorded by raising the temperature of the film with a writing laser beam. A signal reproduction apparatus reproduces the signal by irradiating the film with a reading laser beam. There is an optical system provided in common to both the writing laser beam and the reading laser beam. The signal recorded on the film is reproduced substantially simultaneously with the recording of the signal in order to allow for confirmation of the signal that has been recorded. A modulating circuit is provided for modulating the intensity of the writing laser beam with a frequency of at least twice as high as the maximum frequency of the signal to be recorded.

REFERENCES:
patent: 4494226 (1985-01-01), Hazel et al.
patent: 4538257 (1985-08-01), Klinger
patent: 4564931 (1986-01-01), O'Hara et al.
patent: 4787077 (1988-11-01), Barton et al.
patent: 4811329 (1989-03-01), Shikama et al.

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