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AssigneeEastman Kodak Company
InventorJohn D. Griffith
Estimating the term…
An illuminating system, which illuminates a line and translates that line over a document on a platen of a scanner or copier which receives light from the line on an image (photo) receptor thereof, uses primary and secondary reflectors having internal reflective surfaces which are elliptical troughs. An elliptical trough is defined here as a surface having an elliptical cross section and maintaining that same cross section over its length. The primary reflector contains a lamp having a linear filament in a plane containing the major axis of the primary reflector ellipse and located at one of the focii thereof so as to provide a conjugate line for the light from the lamp along a line containing the other of the focii of the primary ellipse reflector. The primary elliptical trough is terminated by an aperture plate having an aperture in which the line is located. A secondary reflector has an internal reflective surface with a slit facing the document to be illuminated. The secondary reflector has focii, one of which is common with one of the focii of the first reflector located in the aperture while the other focii is along a line in the plane of the document being illuminated. The aperture is sized so that light retroreflected from the document in the image plane on the secondary reflector does not enter the primary reflector and affect the light emanating from the primary reflector which illuminates the line on the document.
A system for illuminating a linear zone on an image plane which comprises primary and secondary reflectors each being elliptical troughs and each having first and second focii which extend along lines parallel to said zone, said second of said focii of said primary reflector and said first of said focii of said secondary reflector being common and extending along the same line, said second focii of said secondary reflector being in said zone, a lamp extending along a line in common with said first of said focii of said primary reflector, a plate terminating said first reflector and extending along the plane containing said same line, said plate having an aperture containing said same line, and said aperture having dimensions to prevent light from regions of said image plane outside said zone from being retroreflected through said aperture into said primary reflector.
Dependencies are inferred from the claim text.