Class 399/180 - Having halftone screen

Subclass of Class 399 - Electrophotography
Definition: Subject matter wherein a means or method is provided that
No. of patents: 31
Last issue date: 03/23/2010

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Number	Title	Issue Date
7684736	Image forming method, screen set and image forming apparatus An image forming apparatus for forming a color image of CMK color plates by electrophotography system in which a K color plate having highest visibility among CMYK colors is composed of a rational number mesh. Profile of halftone dots (201Kh) becomes constant...	03/23/2010
7215444	Systems and methods for designing zero-shift supercell halftone screens Conventional design tools were not developed for designing square zero-shift supercells. Conventionally, solutions that enable square zero-shift supercells were found by trial and error or by exhaustive analysis. According to a first design criterion of this inventi...	05/08/2007
6606470	Color plane partial exposure for reducing edge effect A method for reducing edge effect (white gapping) between objects formed on a photoconductive member of an imaging device includes, during processing of a given color plane, partially exposing the photoconductive member for all image data that specifies a...	08/12/2003
5786843	Two-dimensional modulation for line screen printing An improved method of line screen printing. Instead of screening the image with only one set of lines, the image is also screened with a second set of lines, which are substantially orthogonal to those of the first set. (FIG. 3). The screening is accompli...	07/28/1998
5134439	Exposure compensation system for a dual mode electrophotographic print engine A dual mode electrophotographic print engine. A voltage controller (25) provides operating voltage to a scorotron (27), which applies a charge to a photoreceptive medium. In a first mode a screen (40) is placed in a first position, out of the optical path...	07/28/1992
4901104	Image recording apparatus In an image recording apparatus, a halftone screen having its light transmittance varying regularly is arranged on an optical path extending between a light source and a photo-sensitive recording medium. The halftone screen is movable along the optical pa...	02/13/1990
4888636	Image reproducing system An image forming system includes a color test chart that has a pattern with three tonality levels for each color component. A reading device can read the test chart as well as an original image and generates image signals representing the one of the test ...	12/19/1989
4791450	Multicolor electrophotographic reproduction apparatus and method for producing color accented copies A multicolor electrophotographic reproduction apparatus and method are provided for reproducing a copy in a selected colors. The apparatus includes a digitizer for inputting information denoting the location(s) of the pictorial information and the locatio...	12/13/1988
4783680	Halftone screening system for printer/copier A copier/printer with a light/lens system providing copies of documents, a raster output scanner providing prints in response to image signals, a source of screen image signals, and control means for operating both the light/lens system and the raster out...	11/08/1988
4674856	Image formation apparatus The disclosure is directed to an image formation apparatus for producing both mirror images and normal images. The apparatus comprises an image inverting prism positionable selectively in an optical path of an image transmission device or outside thereof....	06/23/1987
4668978	Thermal transfer color image forming apparatus with image color and image color density control functions A color and density mode control system for an image forming apparatus including an optical scanner and a color specifying unit for specifying the mode, i.e., colors that the apparatus is to use in making copies. Depending on the color mode selected, colo...	05/26/1987
4157869	Transparency reproducing machine An electrostatographic printing machine in which a plurality of transparencies are reproduced simultaneously on a common copy sheet. The printing machine utilizes a pair of slide projectors arranged so that they simultaneously project non-over-lapping light im...	06/12/1979
4120580	Collating system for slide reproduction An electrostatographic printing machine in which a plurality of transparencies are reproduced. The transparencies are stored in an ordered sequence and advanced automatically into communication with the reproduction system so as to form ordered sets of co...	10/17/1978
4111540	Field lens for an electrophotographic printing machine An electrophotographic printing machine in which the platen thereof is a field lens. In the opaque reproduction mode, the original document is positioned on the platen in a light receiving relationship with the illumination system. The presence of the fie...	09/05/1978
4095889	Exposure system for an electrophotographic printing machine An optical system in which a modulated light image of an original document is projected onto a receiving member. The optical system includes a lens and an opaque member having an array of apertures therein associated therewith to improve the light transmi...	06/20/1978
4083632	Multi-frequency screen A half-tone screen in which a substantially transparent substrate has a plurality of opaque regions disposed thereon. The opaque regions are arranged in at least a high frequency repetitive pattern and a low frequency repetitive pattern. This type of scre...	04/11/1978
4072414	Screen for an electrophotographic printing machine An electrophotographic printing machine in which a transparency light image is projected through a screen having a plurality of opaque regions. At least a portion of the opaque regions have a light reflecting surface on one side thereof and a light absorb...	02/07/1978
4068940	Variable contrast optical screening system An electrophotographic printing machine in which a latent image of an original document and a screen pattern are formed on a photoconductive member in superimposed registration with one another. The contrast of the screen pattern is regulated....	01/17/1978
4068939	Color transparency reproducing machine An electrophotographic printing machine in which color transparencies are reproduced. A projected image of the color transparency is scanned forming a light image thereof. The light image is modulated and filtered creating a single color half-tone light i...	01/17/1978
4066353	Half tone imaging system A half-tone screen in which a first and second set of grooves are inscribed in a transparent member. The grooves are arranged in a repetitive pattern with each groove from the first set being interposed between adjacent grooves of the second set, and the ...	01/03/1978
4066351	Variable illumination optical system An optical system in which a screen modulates the light produced thereby. The intensity of the light image is varied as a function of screen position....	01/03/1978
4063810	Color transparency reproducing machine An electrophotographic printing machine in which color transparencies are reproduced. A projected image of the color transparency is scanned forming a light image thereof. The light image is modulated and filtered creating a single color half-tone light i...	12/20/1977
4053217	Color transparency reproducing machine An electrophotographic printing machine in which color transparencies are reproduced. A projected image of the color transparency is scanned forming a light image thereof. The light image is modulated and filtered creating a single color half-tone light i...	10/11/1977
4013355	Notch filter for color transparency copying machines An electrophotographic printing machine in which color transparencies are reproduced. The printing machine includes a notch filter which transmits blue and green light images of the color transparency therethrough while blocking a portion of the red light...	03/22/1977
4012137	Optical system having a rotating screen An optical system in which a light image of an original document is projected onto a light sensitive member. The light image passes through a rotating screen at discrete time intervals forming successive half-tone light images at differing screen angles....	03/15/1977
4007981	Dual mode electrostatographic printing machine A dual mode color electrostatographic printing machine in which either a pictorial copy or a functional copy of an original document is reproduced. Either mode of operation is selectable. In the pictorial copying mode, the latent image recorded on the pho...	02/15/1977
3967894	Screened optical system An optical system in which a continuous tone light image of an original document is formed. The optical system is arranged to illuminate the original document and to create a finely divided uniformly distributed light image. A selectable feature therein p...	07/06/1976
3963342	Curved screen An electrophotographic printing machine in which an arcuate screen member has a curvature substantially equal to the curvature of an arcuate photoconductive member employed therein. The centers of curvature of the screen member and photoconductive member ...	06/15/1976
3961848	Electrophotographic printing machine with halftone screen cleaning An electrophotographic printing machine in which an adjustable screen has particles removed therefrom by a cleaning member moving thereacross....	06/08/1976
3961847	Arcuate screen for an electrophotographic printing machine An electrophotographic printing machine in which an arcuate screen member has a plane of curvature substantially normal to the plane of curvature of an arcuate photoconductive member employed therein....	06/08/1976
3958877	Half-tone screen with cleaning means for an electrophotographic printing machine An electrophotographic printing machine in which a screen moves from an inoperative position remote from a photoconductive member employed therein to an operative position closely adjacent thereto. As the screen moves from the operative position to the in...	05/25/1976

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Class 399/180 - Having halftone screen