System for illuminating a linear zone which reduces the effect o

Details System for illuminating a linear zone which reduces the effect o System for illuminating a linear zone which reduces the effect o

1992-02-05

1993-01-12

Hayes, Monroe H.

Photocopying

Contact printing

Light boxes

355 67, 355 71, 362297, 362346, G03G 1504

Patent

active

051794136

ABSTRACT:
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.

REFERENCES:
patent: 3758774 (1973-09-01), Hildenbrandt
patent: 3768900 (1973-10-01), McLintic
patent: 4357075 (1982-11-01), Hunter
patent: 4473865 (1984-09-01), Landa
patent: 4518249 (1985-05-01), Murata et al.
patent: 4595947 (1986-06-01), Brueggemann
patent: 4816875 (1989-03-01), Takeda et al.
patent: 4858090 (1989-08-01), Downs
patent: 4871249 (1989-10-01), Watson

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