Apparatus for projecting a screen pattern onto a photoconductor

Details Apparatus for projecting a screen pattern onto a photoconductor Apparatus for projecting a screen pattern onto a photoconductor

1983-02-15

1984-10-16

Moses, R. L.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

355 71, G03G 1500

Patent

active

044771770

ABSTRACT:
A duplicator has a movable photoconductor on which electrostatic images are formed. A rotatable transparent cylinder positioned adjacent the front side of the photoconductor has a screen pattern thereon. Wheels on the cylinder contact the photoconductor so that the cylinder is rotated in response to movement of the photoconductor. An elongate light shield positioned inside the cylinder has a first slot adjacent the portion of the cylinder near the photoconductor, and a Fresnel lens is positioned in the slot. Light rays from a point source located outside the cylinder pass through a second slot in the shield and are reflected from a mirror inside the cylinder onto the Fresnel lens. The lens collimates the light rays and directs them through the screen on the transparent drum to thereby project onto the photoconductor an image of the screen pattern on the cylinder.

REFERENCES:
patent: 2598732 (1952-06-01), Walkup
patent: 3493381 (1970-02-01), Maurer
patent: 3535036 (1970-10-01), Starkweather
patent: 3914047 (1975-10-01), Hunt, Jr. et al.
patent: 3958877 (1976-05-01), Menon et al.
patent: 3961847 (1976-06-01), Turner et al.
patent: 3961848 (1976-06-01), Turner
patent: 3963342 (1976-06-01), Stark et al.
patent: 3967894 (1976-07-01), Tsilibes
patent: 3981577 (1976-09-01), Tsilibes
patent: 4012137 (1977-03-01), Goren
patent: 4227795 (1980-10-01), Bobbe et al.
Research Disclosure No. 18542, Sep. 1979.
Research Disclosure No. 19629, Aug. 1980.

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