Abstract: The invention relates to an imaging system for a multi-magnification copier which employs a plurality of gradient index lens arrays to provide a 1.times. as well as a magnification capability. The magnification range of the copier is extended beyond the discrete value associated with each lens array by changing the speed at which the document is normally scanned in the isometric mode so that the image is anamorphically magnified in the scanning direction. This magnification either enlarges or compresses the image at the imaging plane and, due to the narrow scan slit employed with gradient index lens arrays, retains adequate resolution in the developed image.

Abstract: A gradient index lens is positioned between an object and image plane to transmit an image of an object onto the image plane. The lens is oriented at an angle with respect to the object and image planes such that exposure modulation of the image plane in the process direction is minimized.

Abstract: A multi-element lens is provided having a central cavity containing a heavy, high index gas. The central cavity is defined by a pair of meniscus elements and acts as a thick positive lens. The pressure of the gas in the cavity is varied in response to magnification changes desired, the pressure change causing a change in the refractive index of the gas thereby altering the focal length of the lens.

Abstract: A gradient index lens array is provided with reduction and enlargement capabilities. Gradient index fibers are arranged in single row or double row (bundled) configuration with fibers increasingly departing from the perpendicular condition at the center of the array relative to object and image planes in a characteristic fan-like manner. Fiber lengths are adjusted to compensate for changes in total conjugate which occur because of the progressive tilting of the axes of the individual fiber lenses. This is achieved, in one embodiment, by grinding the faces of a lens array into a convex configuration.

Abstract: The present invention relates to a xerographic printer capable of reproducing microfilm or microfiche images over a broad enlargement range. The printer includes a light housing completely enclosed except for an aperture in the bottom wall. Microfilm or fiche images are successively presented adjacent this aperture. The walls of the housing are coated with a diffusely reflective material and cause light from a flash illumination source mounted within the housing to diffusely illuminate the surface of the image adjacent the aperture.

Abstract: In an optical system for a multi-magnification copying device, a relative illumination filter is mounted in a fixed position relative to the projection lens with the center on the lens optical axis. The filter provides a radially varying transmission therethrough which compensates for circularly symmetric nonuniformities in the optical system at any magnification.

Abstract: An illumination system for a document copying machine including an optical cavity having interior walls coated with a white, diffusely reflecting material. One end of the cavity contains a platen for positioning document to be copied while the opposing end contains a lens for forming an image of the document on a light sensitive image plane. Illumination from a single flash illumination source located within the cavity, undergoes multiple reflections from the walls resulting in a uniform diffuse illumination of the document.

Abstract: In a full-frame, copying system, translucent registration guides along the edges of a platen area provide an operator with an indication of which portion of a document overlying the platen will be copied onto selected copy paper at the particular magnification ratio selected. Illumination sources located on the image side of a projection lens create line images which are projected through the lens to illuminate appropriate registration guides corresponding with the particular magnification ratio.

Abstract: A toner and imaging system wherein the utilized toner is composed of a permanent colorant of the final color desired and additionally contains heat sensitive dye that darkens the color of the toner so that it more efficiently absorbs heat during flash fusing but then decomposes, becoming colorless, to leave an image the color of the permanent colorant.

Abstract: A toner and imaging system wherein the utilized toner is composed of a permanent colorant of the final color desired and additionally contains heat sensitive dye that darkens the color of the toner so that it more efficiently absorbs heat during flash fusing but then decomposes, becoming colorless, to leave an image the color of the permanent colorant.

Abstract: Techniques to render documents and like objects uncopyable by photocopy means. Illumination spectral composition, object background color, and photoreceptor sensitivity are appropriately combined such that the photoreceptor perceives no object contrast. The result may be either a blackout or a whiteout of the object information.

Abstract: An optical system is disclosed for substantially doubling the capacity of a photocopying apparatus or the like. It provides alternative modes of operation; adjacent imaging of adjacent objects or double imaging of a single object. In the adjacent imaging mode, a single projection lens projects adjacent images of two adjacent objects in a straightforward way. In the alternative double imaging mode, a pair of projection lenses projects twin images of a single object along "parallel" optical paths.

Abstract: A symmetrical light intensity distribution profile is achieved by placing a pair of similar asymmetrical linear DC gas discharge lamps in parallel position but opposed in polarity. The individual asymmetrical distributions of the lamps combine in a symmetrical total intensity distribution. A desired "butterfly" or other intensity distribution profile can be achieved.

Abstract: A multi-color electrostatic printing machine having processing components to produce either a color or black and white copy of an original. Individual development rollers, one for color and one for black and white, are moved into contact with a photoconductor to develop latent electrostatic images thereon for either a color or black and white copy. Toner donor apparatus spaced about the periphery of the color development roller supply the latter with color toner and additional toner donor apparatus supplies the black development roller with black toner. Each developed color image is transferred in superimposed relationship on sheets of paper.