Method and apparatus for equalizing power output in a laser mark

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

1987-08-05

1988-02-23

Albritton, C. L.

Electric heating

Metal heating

By arc

219121LA, 219121LS, 219121LW, 219121LZ, B23K 2600

Patent

active

047272350

ABSTRACT:
Variations in laser output power are compensated for by increasing the on time of weaker output lasers relative to the more powerful lasers. To avoid nonlinearities 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. Additionally, 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-ionization 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.

REFERENCES:
patent: 4304981 (1981-12-01), Gappa
patent: 4307282 (1981-12-01), Gappa
patent: 4347523 (1982-08-01), Ohara
patent: 4564739 (1986-01-01), Mattelin
patent: 4596995 (1986-06-01), Yamakawa et al.
patent: 4629858 (1986-12-01), Kyle
patent: 4663760 (1987-05-01), Shimada et al.
patent: 4675498 (1987-06-01), Lemelson

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