The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 10, 1984
Filed:
Feb. 15, 1983
Pierce B Day, Pittsford, NY (US);
Eastman Kodak Company, Rochester, NY (US);
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.