| 摘要 |
In a method or system for forming ink holding indicia at a processing surface of a printing form associated with a printing cylinder, a laser beam is provided. The laser beam is modulated to control whether or not at least a portion of the laser beam strikes the processing surface. A focusing optics focuses the laser beam to create a processing spot on the processing surface to create the ink holding indicia. At least a portion of the laser beam not intended to reach the processing surface is directed to a sump. A cover is provided over the sump substantially preventing radiation of the laser beam away from the sump. Alternatively, the processing surface may serve as the sump.
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