Projection device for a photocopying machine

Details Projection device for a photocopying machine Projection device for a photocopying machine

1976-11-10

1978-04-18

Wintercorn, Richard A.

Photocopying

Including fiber optics

354197, 355 8, 355 50, G03B 2700

Patent

active

040848957

ABSTRACT:
The present invention is a projection device for a photocopying machine in which the original documents are moved during the photocopying process and which permits photocopying both of thick and of thin original documents. The projection means includes a focussing means which has a short focal length and is positioned to correctly focus the image of thin original documents which are brought to an exposure station and are only separated space-wise from the focussing means onto a photosensitive material, and a transparent block which, when a thick original document is copied, is automatically interposed between the focussing means and the exposure station and compensates the deviation in the path of image-wise light caused by the transparent carrier on which the thick original document is supported, whereby good resolution is achieved in photocopies of all types of original documents.

REFERENCES:
patent: 3476478 (1969-11-01), Rees, Jr.
patent: 3882520 (1975-05-01), Kamp et al.
patent: 3955888 (1976-05-01), Kakiuchi et al.

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