US PATENT SUBCLASS 347 / 253
.~.~.~ By varying intensity of light beam

Current as of: June, 1999
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347 /   HD   INCREMENTAL PRINTING OF SYMBOLIC INFORMATION

224  DF  LIGHT OR BEAM MARKING APPARATUS OR PROCESSES {2}
225  DF  .~ Scan of light {12}
251  DF  .~.~ Tone marking {3}
253.~.~.~ By varying intensity of light beam

DEFINITION

Classification: 347/253

By varying intensity of light beam:

(under subclass 251) Subject matter wherein means for providing a halftone or grey scale image includes means for modulating power level of the writing beam.