Half tone screen exposure apparatus

Details Half tone screen exposure apparatus Half tone screen exposure apparatus

G - Physics

03

F

95/94.5

G03F 5/00 (2006.01) G03B 27/32 (2006.01) G03B 27/54 (2006.01) G03B 27/72 (2006.01)

Patent

CA 1205664

Abstract of the Disclosure A half tone screen of a graphic camera is uniformly exposed by a pinhole light projector positioned off axis with respect to the main optical projection axis. A light diffuser is positioned intermediate a light source and the pinhole has a variable density light attenuator pattern consisting of a plurality of circular lines for attenuating the light passing through the diffuser and aperture in a manner to produce uniform illumination of the half tone screen.

433616

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