Light output power monitor for a LED printhead

Details Light output power monitor for a LED printhead Light output power monitor for a LED printhead

1989-12-04

1991-05-14

Reinhart, Mark J.

Recorders

Light or beam recording

Including record receiver or handling means therefor

355202, H04N 121

Patent

active

050160273

ABSTRACT:
A light output monitor for a light emitting diode printhead has a light detector internal to the printhead for measuring the light output power of each light emitting diode along a printhead. Calibration factors relating the light output power measured by the detector to the light output power transmitted to the photoreceptive surface of the printer are stored in memory on the printhead. An exposure control device regulates the amount of time each light emitting diode in the printhead exposes the photoreceptive surface with light. A processor periodically and aperiodically uses the light output measurements and the calibration factors to compensate the exposure control device for light output power non-uniformities and temporal irregularities.

REFERENCES:
patent: 4780731 (1988-10-01), Creutzmann et al.
patent: 4878072 (1989-10-01), Reinten
patent: 4897672 (1990-01-01), Horiuchi et al.
Siemans Information Systems, Inc., "LED Image Generator", 1988.

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