Method for producing a calibrated array of light-emitting diodes

Details Method for producing a calibrated array of light-emitting diodes Method for producing a calibrated array of light-emitting diodes

1994-12-20

1997-12-16

Yockey, David F.

Incremental printing of symbolic information

Light or beam marking apparatus or processes

Scan of light

347236, 347238, 324767, 437 7, 437 8, B41J 245, G01R 3127, H01L 2166

Patent

active

056991037

ABSTRACT:
A method for producing a calibrated printhead having a plurality of light-emitting recording elements such as LEDs includes the steps of (a) burning-in the recording elements until a further aging characteristic of the recording elements is in a generally linear range; (b) measuring a light intensity emitted by each recording element after the burning-in in step (a); (c) establishing a target value for additional burning-in of at least those recording elements having measured light intensities above a minimum measured light intensity for a recording element; and (d) respectively providing additional burning-in to those recording elements towards the target value. An apparatus including the calibrated printhead has no data provided to the printhead which is corrected for relative non-uniformity of the recording elements to each other.

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