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    • 32. 发明授权
    • Reduction of differential gloss with halftoned clear toner
    • 用半色调透明调色剂减少差别光泽度
    • US07304770B2
    • 2007-12-04
    • US10929811
    • 2004-08-30
    • Shen-Ge WangChu-Heng LiuBeilei Xu
    • Shen-Ge WangChu-Heng LiuBeilei Xu
    • H04N1/405B41M3/10
    • H04N1/54G06K15/02G06K15/186H04N1/4058
    • A method for reduction of differential gloss as found in halftone image hardcopy prints. The method comprises selecting either a single halftone or employing two halftones: a first halftone having a high apparent gloss characteristic; and a second halftone having a low apparent gloss characteristic. A determination is then made of which areas of the halftone image correspond to potentially high gloss and low gloss regions under normal printing conditions. An overlay of clear toner is applied to the hardcopy print of the halftone image. In one approach a single halftone is employed to control the physical area coverage of the applied clear toner layer so as to adjust the local gloss across for the determined regions and thereby balance the evenness of gloss across the entire hardcopy print of the halftone image. Greater physical area coverage is provided as controlled by the single halftone in low gloss regions, and corresponding less physical area coverage is provided in the low gloss regions. In a further approach two halftones are employed. The first halftone is directed to those portions of the overlaid clear toner determined as corresponding to potentially low gloss regions of the halftone image, and the second halftone is directed to those portions of the clear toner layer determined as overlaying potentially high gloss regions of the halftone image.
    • 减少在半色调图像硬拷贝印刷品中发现的差别光泽的方法。 该方法包括选择单个半色调或采用两个半色调:具有高表观光泽特性的第一半色调; 和具有低表观光泽特性的第二半色调。 然后确定半色调图像的哪些区域在正常打印条件下对应于潜在的高光泽度和低光泽度区域。 将透明调色剂的覆盖层应用于半色调图像的硬拷贝印刷。 在一种方法中,使用单个半色调来控制施加的透明调色剂层的物理面积覆盖,以便调整所确定区域的局部光泽度,从而平衡半色调图像的整个硬拷贝印刷品的光泽均匀度。 在低光泽区域由单一半色调控制提供更大的物理面积覆盖,并且在低光泽区域中提供相应较少的物理面积覆盖。 在另一方面,采用两个半色调。 第一个半色调指向重叠的透明调色剂的那些部分,这些部分被确定为对应于半色调图像的潜在的低光泽区域,并且第二半色调指向被确定为覆盖半色调的潜在高光泽区域的透明调色剂层的那些部分 图片。
    • 34. 发明授权
    • Contact electrostatic printing image forming method and apparatus using
image area centered patch of tonerpatches of toner
    • 接触静电印刷图像形成方法和使用图像区域中心的调色剂调色剂片的装置
    • US5937248A
    • 1999-08-10
    • US197785
    • 1998-11-23
    • Chu-Heng LiuWeizhong Zhao
    • Chu-Heng LiuWeizhong Zhao
    • G03G15/11G03G15/32G03G15/10
    • G03G15/321G03G15/11
    • A printing machine and method for efficiently forming toner images such that a quantity of unused toner applied to a photoreceptor of the machine is significantly diminished are provided. The printing machine and method include a movable photoreceptor having a photoconductive surface for supporting electrostatic charge; a first charging device for selectively charging only scattered portions of the surface of the photoreceptor; a liquid developer material supply and application apparatus for applying a coat of charged toner solids having a single polarity onto each charged selected scattered portion, thereby forming an image area patch of toner; an exposure device for image-wise exposing each charged selected scattered portion to form a first latent image therein; and a contact electrostatic printing (CEP) assembly including a conductive (CEP) roll and a bias source coupled thereto, for applying compressive and tensile forces to the image area centered patches of toner moving through an image processing nip formed by the photoconductive surface of the photoreceptor and the conductive CEP roll, wherein the bias source cooperates with a charge pattern of the image area centered patches of toner to generate image-wise electric fields within the image processing nip, and the image-wise electric fields together with the compressive and tensile forces, enable easy separation of background area toner solids from image area toner solids of the image area centered patches of toner, and onto the CEP roll; thereby resulting in an efficiently produced, quality toner image with significantly reduced non-development marking material generated and requiring removal.
    • 提供了一种有效地形成调色剂图像的打印机和方法,使得施加到机器的感光体上的未使用调色剂的量显着减少。 印刷机和方法包括具有用于支撑静电荷的光导表面的可动感光体; 第一充电装置,用于选择性地仅对感光体的表面的散射部分进行充电; 液体显影剂供应和施加装置,用于将具有单一极性的带电调色剂固体涂层施加到每个带电的选定散射部分上,从而形成调色剂的图像区域贴片; 曝光装置,用于对每个带电的所选散射部分进行成像曝光以在其中形成第一潜像; 以及包括导电(CEP)辊和耦合到其上的偏压源的接触静电印刷(CEP)组件,用于将压缩和拉伸力施加到由图像区域中心的调色剂移动的色粉移动通过由 感光体和导电CEP辊,其中偏压源与图像区域中心的调色剂片的电荷图案配合,以在图像处理辊隙内产生成像的电场,并且成像电场与压缩和拉伸 使得背景区域调色剂固体可以从图像区域中心的调色剂色块的图像区域调色剂固体容易地分离到CEP辊上; 从而产生有效产生的质量调色剂图像,其显着减少的非显影标记材料产生并需要去除。