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    • 11. 发明授权
    • Lithographic printing process
    • 光刻印刷工艺
    • US4011085A
    • 1977-03-08
    • US511293
    • 1974-10-02
    • Sidney L. RapoportDouglas F. Mitchell
    • Sidney L. RapoportDouglas F. Mitchell
    • B41M1/06B41M3/00G03F5/00G03F5/12G03F5/22B41M1/18
    • G03F5/22B41M1/06B41M3/00G03F5/00G03F5/12
    • An improved two printing step process for reproducing visual subject matter including the making of a secondary printing plate with a positive image random pattern screen and printing a substrate sequentially and in registry with the secondary printing plate and a master printing plate made with a conventional half tone screen. The random pattern screen is a positive image phototransparency having a large plurality of irregularly shaped highlight areas and contrasting shadow areas per square inch, an optical density from about 0.17 to about 1.6, a contrast factor from about 0.75 to about 1.5 and a transparency factor from about 0.25 to about 0.60. The random pattern screen is made from a transparent plate having light disruptive projections on its surface. A negative and a positive phototransparency of the transparent plate are made while controlling exposure and developing conditions to produce a positive image screen having the desired characteristics.
    • 一种用于再现视觉主题的改进的两个印刷步骤过程,包括制作具有正像随机图案屏幕的二次印版和顺序地印刷基板并与二次印刷版对准,以及用常规半色调制成的母版印刷 屏幕。 随机图案屏幕是具有大量不规则形状的高亮区域和每平方英寸约束阴影区域的正像图像透明度,约0.17至约1.6的光密度,约0.75至约1.5的对比度因子和来自 约0.25至约0.60。 随机图案屏幕由其表面上具有光破坏性突起的透明板制成。 在控制曝光和显影条件以产生具有所需特性的正图像屏幕的同时,进行透明板的负和正光透视。
    • 15. 发明授权
    • Screens for producing a printing plate for image reproduction
    • 用于生产用于图像再现的打印板的屏幕
    • US3634092A
    • 1972-01-11
    • US3634092D
    • 1969-08-01
    • ANTON WILHELM JEMSEBY
    • JEMSEBY ANTON WILHELM
    • G03F5/12G03F5/00
    • G03F5/12
    • A screen for use in the production of a printing plate for image reproduction has individual mutually identical transparent surface elements surrounded by nontransparent surface portions, the centers of said transparent surface elements being situated on the crossings between lines in two coordinate line systems, the lines of which are spaced an equal distance apart and form an acute angle of 15*-60*, said surface elements having an at least substantial portion in the general form of a rhomb with its sides parallel to the lines of respectively one and the other coordinate line system, and the longest diagonal of the rhomb being at least equally long as said distance between the lines of the coordinate line systems.
    • 用于生产用于图像再现的印版的屏幕具有由非透明表面部分包围的单独相互相同的透明表面元件,所述透明表面元件的中心位于两个坐标系中的线之间的交叉处, 它们间隔相等的距离并形成15°-60°的锐角,所述表面元件具有一般形式的菱形的至少相当大的部分,其侧面平行于一条和另一条坐标线 系统,并且所述菱形的最长对角线至少等同于所述坐标系系线之间的所述距离。
    • 18. 发明授权
    • Halftone screen with cell matrix
    • 半色调屏幕与单元格矩阵
    • US4188225A
    • 1980-02-12
    • US894902
    • 1978-04-10
    • Hua-Kuang Liu
    • Hua-Kuang Liu
    • G03F5/12G03F5/00
    • G03F5/12
    • An improved halftone dot screen for use in reproduction of continuous-tone graphic images is disclosed. The screen comprises a two-dimensional matrix of cells (dots) each cell having a common pattern of transmittance to radiation utilized in the reproduction process. The common pattern of transmittance for each cell is characterized by a finite number of different discrete transmittance level patterns. In a preferred embodiment, these patterns include portions arranged along the respective sides of a parallelogram. In one preferred embodiment, the discrete transmittance level patterns comprise an array of concentric parallelograms. Each parallelogram has a plurality of dot portions arranged along the sides of the parallelogram. The sides of the parallelogram patterns are preferably disposed at a substantial angle to the horizontal to reduce moire and rosette pattern effects and to simplify the reproduction process.
    • 公开了一种用于再现连续色调图形图像的改进的半色调点阵屏幕。 屏幕包括每个单元的单元的二维矩阵(点),其具有与在再现处理中使用的辐射的透射率的共同图案。 每个单元的透射率的共同图案的特征在于有限数量的不同离散透射率水平图案。 在优选实施例中,这些图案包括沿着平行四边形的各个侧面布置的部分。 在一个优选实施例中,离散透射率水平图案包括同心平行四边形阵列。 每个平行四边形具有沿着平行四边形的侧面布置的多个点部分。 平行四边形图案的侧面优选地以与水平面相当的角度设置,以减少莫尔条纹和玫瑰花纹图案效果并简化再现过程。