Recording system for recording information on record medium by u

Details Recording system for recording information on record medium by u Recording system for recording information on record medium by u

1981-03-03

1983-04-12

Hartary, Joseph W.

Recorders

Printing, dotting, or punching marker

Ink transfer support or moving means

346 76L, 369106, 369116, G01D 1514

Patent

active

043800157

ABSTRACT:
A recording light beam from an argon laser is modulated with an electrical recording signal and then recorded on a rotating disc-shaped record medium. Immediately after this recording, a recorded signal on the record medium is reproduced with a light beam from a helium-argon laser and converted into an electrical signal. Duty cycles of both signals are sensed by respective duty cycle sensors. A differential amplifier produces a differential signal between the sensed duty cycles and supplies it to an optical modulator arranged to control the output of the recording laser. The modulator controls the recording light beam to its optimum light level for recording in response to the differential signal which was detected just before its modulation.

REFERENCES:
patent: 4225873 (1980-09-01), Winslow
patent: 4283785 (1981-08-01), Miyauchi

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