Photocopying – Projection printing and copying cameras – Combined with or convertible to a contact printer
Patent
1983-02-15
1984-07-10
Prescott, A. C.
Photocopying
Projection printing and copying cameras
Combined with or convertible to a contact printer
355 3R, 355 67, 355 71, G03G 1500, G03G 1530
Patent
active
044590113
ABSTRACT:
A duplicator has a photoconductor on which electrostatic images are formed. A member having a screen pattern of opaque and transparent areas is positioned adjacent to the photoconductor. A Fresnel lens near the screen member receives light rays from a concentrated light source spaced from the lens. Means are provided for folding light rays from the source a plurality of times and then directing the light rays onto the lens, thereby to provide collimated light rays that are directed onto the member to provide an image of the screen pattern onto the photoconductor. The light rays can be folded by means of a polygon of glass or other suitable materials, or by two parallel mirrors and a plurality of baffles arranged so that the light rays are reflected repeatedly from one mirror surface to the other. By folding the light rays a plurality of times, the distance traveled by light rays from the light source to the Fresnel lens can be equal to the focal length of the Fresnel lens and, at the same time, the projection apparatus can be quite small or compact.
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Childress G. Herman
Eastman Kodak Company
Prescott A. C.
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