Optical system for use in electronic enlarger

Details Optical system for use in electronic enlarger Optical system for use in electronic enlarger

1982-07-01

1984-07-03

Griffin, Donald A.

Photocopying

Projection printing and copying cameras

With cathode ray tube for light source

G03B 2772

Patent

active

044576188

ABSTRACT:
An optical system for reducing the visual effects of fringing or artifacts in projection prints made with an electronic enlarger employing a flying spot scanner as an illumination source. The optical system includes a graded density aperture mask in conjunction with a raster relay lens to alter the energy distribution of the flying spot so that, as outline areas of the transparency are scanned, fringing varies in a more gradual manner than before thereby rendering the fringing visually unobjectionable.

REFERENCES:
patent: 2480423 (1949-08-01), Simmon
patent: 2842025 (1958-07-01), Craig
patent: 3153698 (1964-10-01), Hall et al.
patent: 3177764 (1965-04-01), Akima
patent: 3651252 (1972-03-01), Land et al.
patent: 3700329 (1972-10-01), Mason

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