Aperture disc and method of making the same

Details Aperture disc and method of making the same Aperture disc and method of making the same

1989-03-08

1990-07-10

Dees, Jose

Radiation imagery chemistry: process, composition, or product th

Radiation modifying product or process of making

Radiation mask

430 22, 354 4, G03F 100

Patent

active

049406418

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 velocity 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 aperture and the indicators, developing the film as a master and contact printing copies of the images formed on the master.

REFERENCES:
patent: 2413600 (1946-12-01), Bierman
patent: 3330182 (1967-07-01), Gerber et al.
patent: 3538828 (1970-11-01), Genovese
patent: 4516842 (1985-05-01), Trombert
patent: 4653882 (1987-03-01), Cerf

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