Photo printing by intensity and velocity modulation

Details Photo printing by intensity and velocity modulation Photo printing by intensity and velocity modulation

1979-06-21

1981-05-05

Hix, L. T.

Photocopying

Projection printing and copying cameras

With cathode ray tube for light source

355 68, 355 83, G03B 2780

Patent

active

042655323

ABSTRACT:
Automatic incremental control of the exposure of a photosensitive image-receiving material during contact or projection printing is achieved by the use of a scanning exposing light beam, such as that from a cathode ray tube, wherein both the beam intensity and its rate of deflection can be varied in response to signals derived from a photodetector which views the scanning light after its passage through each incremental area of the transparency being reproduced.
Embodiments capable of combined control of the intensity and velocity, or the dwell time, of the scanning light beam are disclosed, together with means for controlling exposure level and contrast.

REFERENCES:
patent: 2842025 (1958-07-01), Craig
patent: 3011395 (1961-12-01), Foise
patent: 3041932 (1962-07-01), Kilminster
patent: 3400632 (1968-09-01), Wahli

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