Recalibration system for led array.

摘要

A simple and reliable method of recalibrating a LED print head (2) comprises providing a photodetector array (20) 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 (12) until the actual and desired values correspond, at which time a memory storing the current leveels to be applied to the diode array is updated. One or more reference diodes (22) 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.