• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    1535425 Electro-photographic printer XEROX CORP 6 April 1976 [10 April 1975] 13902/76 Heading G2X An electro-photographic printer comprises a photo-conductive member and a half-tone screen member, the members being at least part cylindrical and mounted with their axes substantially coincident, the screen member having the greater radius of curvature.
    公开号:SU727166A3
    申请号:SU762342408
    申请日:1976-04-06
    公开日:1980-04-05
    发明作者:М.Старк Ховард；Натан Горен Роберт
    申请人:Ксерокс Корпорейшн (Фирма)；
    IPC主号:
    专利说明:

    This invention relates to electrography, in particular to optical systems of electrophotographic copiers with rasterization of half-tone originals. The problem of obtaining grayscale and images is solved in the majority of yours by means of image rasterization, which consists in obtaining the effect of gradation of tones by changing the diameters of points or the width of lines, formed by a raster screen and making up a high-intensity light or low-intensity areas. By the optical density of the original sections, points or lines have a minimum size, increasing in the intermediate zones, and completely merge in the dark zones. An electrophotographic apparatus is known, comprising an electrophotographic cylinder, charging, exposing, developing, transferring and fixing the obtained image 2. The image scan in the renowned apparatus is carried out with the help of a lamp and a lens moving along the original synchronously with the rotation of the electrophotographic cylinder. The parts of the original are projected onto the surface of the cylinder through shch.p, having a contour configuration in the form of a butterfly, made of an opaque material. Such a scan of a halftone image causes blurring of the image, especially at the edges of the cylinder. The use of a flat raster, the lines of which are perpendicular to the cylinder generators, also eliminates the blurring of the halftone images, maximum at the edges of the cylinder. The aim of the invention is to improve the quality of the halftone image by eliminating edge blurring. The goal is achieved by the fact that the proposed apparatus is equipped with a curved raster screen with a curvature of a point equal to the curvature of the electrophotographic cylinder and installed at a distance from it, while their centers of curvature coincide. In FIG. 1 shows the projection system of the copier; figure 2 - raster screen. The device contains a lamp I, a glass slide 2, the original 3, operct 4,
    权利要求:
    Claims (1)
    [1]
    Claim
    The electrophotographic copied: an apparatus containing an electric photo · ’5 graphic cylinder, charging, exposure, manifestation, transfer nodes; and fixing the received image, with the fact that, in order to improve the quality of the 20-halftone image, it is equipped with a curved raster screen located at a distance from the surface of the electrophotographic tsilin; pa and parallel to it, while their 25 centers of curvature coincide.
    类似技术:
    公开号 | 公开日 | 专利标题
    US4403848A|1983-09-13|Electronic color printing system
    US3926518A|1975-12-16|Optical scanning system
    US4660961A|1987-04-28|Copying apparatus for synthesizing images
    US4472047A|1984-09-18|Apparatus and method for electrophotographically producing copy having continuous-tone and other content
    US3671121A|1972-06-20|Exposure device for controlling charge on a portion of a charged surface bordering an image frame projected on the charged surface
    SU727166A3|1980-04-05|Electrophotographic printing apparatus
    GB1501737A|1978-02-22|Optical system including a screen
    SU822771A3|1981-04-15|Electrophotographic device for multicolour copying
    GB1324097A|1973-07-18|Microfilm projection apparatus
    US3905822A|1975-09-16|Compound screen for object screening
    US4083632A|1978-04-11|Multi-frequency screen
    US4537490A|1985-08-27|Apparatus and method for electrophotographically producing copy having continuous-tone and other content
    US3700325A|1972-10-24|Scanning optical system for photocopying apparatus
    US4334763A|1982-06-15|Electrophotographic copying apparatus
    US4354756A|1982-10-19|Copying apparatus
    US3497296A|1970-02-24|Xerographic exposure apparatus
    GB1566606A|1980-05-08|Electrophotographic machine
    US4072413A|1978-02-07|Electrostatographic reproduction methods and machines
    US4072414A|1978-02-07|Screen for an electrophotographic printing machine
    US5150158A|1992-09-22|Flat screen for an electrophotographic printing device
    JPS6052866A|1985-03-26|Electrophotographic copying device for forming image in plural modes
    US4811057A|1989-03-07|Light source assembly for use with an electrophotographic copying apparatus
    US4967265A|1990-10-30|Color correction system for an electrophotographic copying machine
    US5049936A|1991-09-17|Electrophotographic copier/duplicator having dual imaging apparatus
    EP0264300B1|1992-09-09|Light source assembly for use with an electrophotographic copying apparatus
    同族专利:
    公开号 | 公开日
    FR2307297B1|1980-08-22|
    DE2614392A1|1976-10-21|
    NL7603734A|1976-10-12|
    US3963342A|1976-06-15|
    DE2614392C3|1979-01-25|
    GB1535425A|1978-12-13|
    JPS6041352B2|1985-09-17|
    DE2614392B2|1978-05-18|
    JPS51126838A|1976-11-05|
    CA1085905A|1980-09-16|
    FR2307297A1|1976-11-05|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US3120790A|1961-08-30|1964-02-11|Xerox Corp|Xerographic exposure apparatus|
    US3517596A|1967-12-27|1970-06-30|Rca Corp|Screening unit for half-tone color reproduction|
    US3700325A|1970-03-26|1972-10-24|David C Harper|Scanning optical system for photocopying apparatus|
    DE2218456A1|1971-07-07|1973-01-25|Elbe Kamera Gmbh|DEVICE FOR OVERLAY GRID EXPOSURE|JPS567947Y2|1975-04-09|1981-02-21|
    JPS5924820A|1982-08-02|1984-02-08|Ricoh Co Ltd|Optical recorder|
    US4477177A|1983-02-15|1984-10-16|Eastman Kodak Company|Apparatus for projecting a screen pattern onto a photoconductor|
    JPS6123134A|1984-07-12|1986-01-31|Fuji Xerox Co Ltd|Copying machine|
    JPS6357272U|1986-09-30|1988-04-16|
    JPH052502B2|1987-12-23|1993-01-12|Sekisui Plastics|
    JPH0523589B2|1988-05-30|1993-04-05|Sekisui Plastics|
    US5134439A|1990-05-25|1992-07-28|Colorocs Corporation|Exposure compensation system for a dual mode electrophotographic print engine|
    US5150158A|1990-10-29|1992-09-22|Colorocs Corporation|Flat screen for an electrophotographic printing device|
    JPH07143912A|1993-11-22|1995-06-06|Yamato Esuron Kk|Container for cosmetics|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    US05/566,886|US3963342A|1975-04-10|1975-04-10|Curved screen|
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