Laser exposure apparatus for printing forms to be imagewise expo

Details Laser exposure apparatus for printing forms to be imagewise expo Laser exposure apparatus for printing forms to be imagewise expo

1993-07-28

1996-04-02

Reinhart, Mark J.

Incremental printing of symbolic information

Light or beam marking apparatus or processes

Scan of light

347237, 347238, B41J 247

Patent

active

055045154

ABSTRACT:
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.

REFERENCES:
patent: 3144331 (1964-08-01), Thomnes
patent: 3859091 (1975-01-01), Wessells et al.
patent: 4298803 (1981-11-01), Matsuura et al.
patent: 4716097 (1987-12-01), Weed
patent: 4796038 (1989-01-01), Allen et al.
patent: 4864326 (1989-09-01), Kawamura et al.
patent: 4884857 (1989-12-01), Prakash et al.

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