Projection copying apparatus and projection screen therefor

Details Projection copying apparatus and projection screen therefor Projection copying apparatus and projection screen therefor

1990-02-01

1991-03-26

Wintercorn, Richard A.

Photocopying

Projection printing and copying cameras

With focusing or projection screen

355 40, 355218, G03B 1324, G03B 1326

Patent

active

050033433

ABSTRACT:
A projection copying apparatus for reproducing microfilmed originals on a light-tightly disposable projection screen and for producing copies of microfilmed originals comprises means for copying of dot originals operating for complete or sectional copying of the originals, and a projection screen including a diffusing disc, an LCD dics arranged on the diffusing disc, the LCD disc being switchable between two conditions so that in one of the conditions it is transparent for observation of the originals and in the other of the conditions it is opaque for copying or searching.

REFERENCES:
patent: 4472050 (1984-09-01), Stockburger et al.
patent: 4734789 (1988-03-01), Smith et al.
patent: 4903078 (1990-02-01), Yeo
patent: 4929057 (1990-05-01), Aoki et al.
patent: 4933754 (1990-06-01), Reed et al.

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