Projection copying apparatus and projection screen therefor

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

G - Physics

03

B

314/9, 95/32.6

G03B 27/32 (2006.01) G03B 21/11 (2006.01) G03B 21/62 (2006.01)

Patent

CA 2009004

ABSTRACT OF THE DISCLOSURE 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.

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