Patent
1988-02-17
1989-06-20
Gellner, Michael L.
354 15, G03B 4100
Patent
active
048413160
ABSTRACT:
An indexing system for selectively orienting one of a series of arcuately oriented different sized and/or shaped apertures formed around an aperture disc used in a photohead for exposing upon a photosensitive surface detailed graphic information using a light beam. The aperture disc has formed thereon, equidistantly spaced indicators in the form of slots allowing radiant energy generated by a light emitter to impede upon and energize a split cell photosensitive detector. A control system rotates an aperture wheel to a next selected position at a first volocity until a selected aperture is within the vicinity of the next selected position and subsequently rotates the aperture disc at a second slower velocity to precisely position the next selected position in registry with the light beam. A method for creating the aperture disc includes inscribing with a light beam upon a film, the pattern of the apertures and the indicators, developing the film as a master and contact printing copies of the images formed on the master.
REFERENCES:
patent: 3330182 (1967-07-01), Gerber et al.
patent: 4343540 (1982-08-01), Berdat
patent: 4400069 (1983-08-01), St. Pierre et al.
patent: 4516842 (1985-05-01), Trombert
Berdat Henry F.
Davidson Bruce L.
Pavone Robert J.
Gellner Michael L.
The Gerber Scientific Instrument Company
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