Method for correcting beam intensity upon scanning and recording

Details Method for correcting beam intensity upon scanning and recording Method for correcting beam intensity upon scanning and recording

1984-01-09

1986-04-08

Goldberg, E. A.

Recorders

Printing, dotting, or punching marker

Ink transfer support or moving means

369116, G01D 942

Patent

active

045816174

ABSTRACT:
A method for automatically correcting variations in intensity of laser beams output from a projection lens, which variations occur due to variations of a spectrum pattern of optical fibers when their tip portions move, by paying attention to each of focal points of an image sensor which focal points correspond respectively to the optical fibers, comparing the sum of signal outputs from regions of the image sensor, which regions correspond respectively to the laser beams, with a signal output corresponding to a standard beam intensity required for the exposure of a photosensitive material to determine a value to be corrected, and then feeding the value back to acousto-optic light modulators so as to change the modulation efficienties of the acousto-optic light modulators.

REFERENCES:
patent: 3787888 (1974-01-01), Haskal
patent: 4093961 (1978-06-01), Kanamaru
patent: 4283785 (1981-08-01), Miyauchi
patent: 4470075 (1984-09-01), Yoshimoto

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