B - Operations – Transporting – 41 – J
Patent
B - Operations, Transporting
41
J
B41J 2/44 (2006.01) G02B 26/12 (2006.01) G03F 7/20 (2006.01)
Patent
CA 2101582
Abstract of the Disclosure A laser exposure apparatus utilizing a laser, beam divider, modulator, beam expander, beam combiner, polygonal mirror and also a scanner lens, path-folding mirror and a reference mask. The laser beam is divided in the beam divider into a writing beam and a reference beam, both of which are brought together by means of two path-folding mirrors and a beam combiner. The writing beam is then guided through an exposure slit onto a printing form by a path-folding mirror. One additional exposure device is disposed upstream and/or downstream of the exposure slot, and in the direction of conveyance of the printing form. Only one of the additional exposure devices is switched on during operation, so that either a preexposure or an afterexposure is accomplished in addition to the laser main exposure of the printing form.
Haberhauer Helmuth
Kraemer Norbert
Zertani Rudolf
Fetherstonhaugh & Co.
Hoechst Aktiengesellschaft
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