Method and apparatus for equalizing power output in a laser...

Details Method and apparatus for equalizing power output in a laser... Method and apparatus for equalizing power output in a laser...

G - Physics

06

K

327/1.4

G06K 1/12 (2006.01) B23K 26/06 (2006.01) G06K 15/12 (2006.01)

Patent

CA 1292286

METHOD AND APPARATUS FOR EQUALIZING POWER OUTPUT IN A LASER MARKING SYSTEM ABSTRACT OF THE DISCLOSURE Variations in laser output power are compensated for by increasing the on time of weaker output lasers relative to the the more powerful lasers. To avoid non- linearities where the object to be marked is a moving substrate, the on time pulses which control the lasers are centered about a single time reference point. Addition- ally, for high printing rates a pre-ionization technique is disclosed which is utilized to enable a laser to fire more quickly than would otherwise be possible. Pre-ioni- zation may be used for every dot to be printed or only when a laser has not been fired during the previous printing "stroke" depending upon the stroke rate.

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