Recalibration system for LED array

Details Recalibration system for LED array Recalibration system for LED array

1988-09-30

1989-08-15

Evans, Arthur G.

Recorders

Electric recording

Electrochemical

346160, G01D 1500

Patent

active

048579440

ABSTRACT:
A simple and reliable method of recalibrating a LED print head comprises providing a photodetector array for detecting the intensity of illumination of each LED, comparing the actual intensity with a desired value and adjusting the level of current applied to the LED array until the actual and desired values correspond, at which time a memory storing the current levels to be applied to the diode array is updated. One or more reference diodes are provided and employed in an initial step in which the current applied to the reference diodes is adjusted until actual and desired current levels correspond, at which time all stored current values for all LED are updated.

REFERENCES:
patent: 4651176 (1987-03-01), Yamakawa et al.
patent: 4700206 (1987-10-01), Yamakawa et al.

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