Recorders – Light or beam recording – Including record receiver or handling means therefor
Patent
1988-06-23
1990-01-30
Walberg, Teresa J.
Recorders
Light or beam recording
Including record receiver or handling means therefor
346160, G01D 942, G01D 1514
Patent
active
048976725
ABSTRACT:
A checking method for a device having a plurality of light emitting elements, especially an LED array installed in electronic printing equipment. The check is done while the LED array is mounted in the equipment and does not require removal thereof. The check is done in a short time period, so it can be done during a period of page change of the printer, without disturbing the operation of the printer. Each of the LEDs are lighted one by one with a pulse. The output emission of the array is detected by a photoelectric detector which is positioned to detect the emission from any of the LEDs. The output of the detector becomes a burst of pulses, each of the pulses representing the emission property of a corresponding LED. Each pulse is converted into a digital signal and stored in a RAM as emission data. The emission data is fed back to the driver of each LED to compensate for differences in the emission characteristics of the LEDs. This improves the uniformity of the output image the electronic printer. Each time of the check is performed, the RAM is rewritten. Thereby, a change in the emission data indicates a change or degradation of one or more of the LEDs. This enables one to forecast the life expectancy of the LED array, and maintenance of the printer becomes easier.
REFERENCES:
patent: 4780731 (1988-10-01), Creutzmann
Horiuchi Mamoru
Kimura Masatoshi
Shimizu Hirotoshi
Uehara Yuji
Wada Yoshinori
Fujitsu Limited
Rogers Scott A.
Walberg Teresa J.
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