Electrophotographic copying apparatus with device for exposing i

Details Electrophotographic copying apparatus with device for exposing i Electrophotographic copying apparatus with device for exposing i

1976-11-04

1978-04-25

Moses, Richard L.

Photocopying

Including fiber optics

355 71, G03G 1500

Patent

active

040860086

ABSTRACT:
In an electrophotographic copying apparatus in which an imagewise exposed photoconductive plate moving to a developing station passes a light source and a light shield which are arranged for selectively exposing parts of the photoconductive plate outside the area of the copy image, the light shield is made slightly light transmitting, such as by making it of a glass or plastic having a light transmittance of 2.5 to 25%, so that the light source and shield serve the dual functions of fully exposing nonimage parts of the plate and weakly exposing its image area, thus improving the contrast and tone reproduction in the developed image.

REFERENCES:
patent: 3724942 (1973-04-01), Gibson et al.
"Shutter Assembly for Selectively Erasing Nonimage Areas of a Photoconductor Segment", IBM Tech. Bull., vol. 16, No. 4, Sept. 1973, pp. 1262, 1263.

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