Half tone screen exposure apparatus

Details Half tone screen exposure apparatus Half tone screen exposure apparatus

1982-07-29

1984-08-21

Wintercorn, Richard A.

Photocopying

Projection printing and copying cameras

Illumination systems or details

355 70, G03B 2772

Patent

active

044667353

ABSTRACT:
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.

REFERENCES:
patent: 2384578 (1945-09-01), Turner
patent: 4059357 (1977-11-01), Klein
patent: 4135813 (1979-01-01), Frank et al.
patent: 4260256 (1981-04-01), Smart

Affiliated with

Also associated with

Rating

Half tone screen exposure apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Half tone screen exposure apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Half tone screen exposure apparatus will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1936702