LED age correction means

Details LED age correction means LED age correction means

1988-09-08

1989-10-31

Evans, Arthur G.

Recorders

Electric recording

Electrochemical

346160, 400 53, G01D 1500

Patent

active

048780723

ABSTRACT:
An aging correction system for an LED array in a printer, in which each LED can be energized during a variable time and in which a light sensor, with which the relative light-output of each LED can be measured and compared with earlier measured values, is disposed near the array, and in which on the basis of these measured values a new correction value is determined.

REFERENCES:
patent: 4477821 (1984-10-01), Yamamoto
patent: 4799071 (1989-01-01), Zeise et al.

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