Method and apparatus for improving the uniformity of an LED prin

Details Method and apparatus for improving the uniformity of an LED prin Method and apparatus for improving the uniformity of an LED prin

1989-07-07

1991-01-01

Reinhart, Mark J.

Recorders

Light or beam recording

Including record receiver or handling means therefor

346160, G01D 1514, G01D 245, H04N 1036

Patent

active

049822039

ABSTRACT:
An apparatus and method are provided to correct for the amount of degradation in light output of the light source used with an electrophotographic recording medium of an optical printer. The percentage amount of degradation due to aging is predicted by measuring degradation over a short interval and used to adjust the light output of the individual LEDs by pulse width modulation or current modulation so that there is a uniform light output. Similarly, the percentage amount of degradation due to temperature changes is predicted and used to adjust the light output.

REFERENCES:
patent: 4780731 (1988-10-01), Creutzmann

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