Photographic screen

Details Photographic screen Photographic screen

1986-12-31

1987-12-29

Davie, James W.

350353, G02F 117

Patent

active

047156902

ABSTRACT:
There is presented an optical screen suitable for taking a picture by placing it between the object and a photosensitive material. The optical screen has a specific means for controlling the difference in transmission density in an optically heterogeneous pattern and/or the specific area of the lower transmission density portions, typically an electrochromic display device. By use of such a single optical screen having a variable optically heterogeneous pattern, cumbersome operations for displacing one screen for another in the prior art can be obviated.

REFERENCES:
patent: 3986771 (1976-10-01), Tsukada
patent: 4297695 (1981-10-01), Marshall

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