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    Plural belt document feeder with optimum optical properties
    1.
    发明授权
    Plural belt document feeder with optimum optical properties 失效
    多种带式送纸器具有最佳的光学特性

    公开(公告)号：US4903074A

    公开(公告)日：1990-02-20

    申请号：US336992

    申请日：1989-04-12

    申请人： William L. Lama ,  Robert P. Loce ,  Martin Pepe, Jr. ,  Eleanor Whitte ,  Robert P. Siegel ,  Antje B. Parker ,  Peter Watson

    发明人： William L. Lama ,  Robert P. Loce ,  Martin Pepe, Jr. ,  Eleanor Whitte ,  Robert P. Siegel ,  Antje B. Parker ,  Peter Watson

    IPC分类号： G03B27/62 ,  G03G15/00

    CPC分类号： G03G15/60 ,  G03B27/625 ,  G03G2215/00185

    摘要： A document feeder is provided for presenting documents to the platen of a copier for copying with a vacuum belt platen transport system having document transporting belts movable under a substantially planar vaccum plenum backing. Also included is a vacuum system for applying a partial vacuum to a document sheet being transported by the movable belts over the platen. Show-through and show-around problems are reduced by optically mtching the belts and the plenum backing. In the preferred embodiment, the background surface is slightly roughend and made to be approximately 92% reflective to light during image exposure. The belts are composed of a urethane material which is approximately 16% transmissive but provides a 91% reflectance when moving along the plenum surface.

    摘要翻译： 提供了一种文件馈送器，用于将文件呈现在复印机的压板上，用于通过真空带压板输送系统进行复印，所述真空带压板输送系统具有可在基本上平面的真空充气背衬下移动的文档传 还包括真空系统，用于将部分真空施加到由可移动带在压板上传送的原稿上。 通过旋转皮带和充气背衬来减少显示和显示问题。 在优选实施例中，背景表面稍微变粗糙并且在图像曝光期间被制成大约92％的反射光。 皮带由氨基甲酸乙酯材料构成，其大约为16％透射性，但是当沿着气室表面移动时，它提供了91％的反射率。

    Method of hybrid halftone printing by limiting the number of gray pixels and gray pixel levels
    2.
    发明授权
    Method of hybrid halftone printing by limiting the number of gray pixels and gray pixel levels 失效
    通过限制灰度像素数量和灰度像素级别的混合半色调打印方法

    公开(公告)号：US5406379A

    公开(公告)日：1995-04-11

    申请号：US980030

    申请日：1992-11-23

    申请人： Jeffrey D. Kingsley ,  Robert P. Loce ,  Susan E. Dunn ,  William L. Lama

    发明人： Jeffrey D. Kingsley ,  Robert P. Loce ,  Susan E. Dunn ,  William L. Lama

    IPC分类号： B41J2/52 ,  G03F5/00 ,  G03G15/00 ,  H04N1/23 ,  H04N1/40 ,  H04N1/405 ,  H04N1/21 ,  G01D9/42

    CPC分类号： H04N1/40087

    摘要： A hybrid halftone cell selection method enables selection of gray levels in halftone printing algorithms to minimize the effects of noise resulting in nonuniformities, such as, for example, halftone banding. The method requires selection of hybrid halftone cells possessing structures wherein the total number of gray pixels are limited. The number of gray pixels having any given intermediate reflectance level in any halftone cell is also limited. The cell selection method thus reduces the number of TRC gray steps to some minimum required number by eliminating the most noise sensitive cells (i.e. those cells having the highest percentage of gray level pixels). The intermediate reflectance values of the gray pixels in the selected cells are then selected to produce uniform gray steps and reduce variability in the TRC.

    摘要翻译： 混合半色调细胞选择方法使得能够在半色调打印算法中选择灰度级以最小化导致不均匀性（例如半色调条带）的噪声的影响。 该方法需要选择具有其中灰色像素总数有限的结构的混合半色调细胞。 在任何半色调单元中具有任何给定中间反射率水平的灰度像素的数量也受到限制。 因此，通过消除大多数噪声敏感小区（即具有最高百分比灰度像素的那些小区），小区选择方法将TRC灰阶的数目减少到一些最小所需数量。 然后选择所选单元格中的灰色像素的中间反射率值，以产生均匀的灰阶，并减少TRC中的变异性。

    Multi-beam scanning system compensated for banding
    4.
    发明授权
    Multi-beam scanning system compensated for banding 失效
    多波束扫描系统补偿条带

    公开(公告)号：US4989019A

    公开(公告)日：1991-01-29

    申请号：US469987

    申请日：1990-01-25

    申请人： Robert P. Loce ,  William L. Lama ,  Per S. Nylen

    发明人： Robert P. Loce ,  William L. Lama ,  Per S. Nylen

    IPC分类号： B41J2/44 ,  G02B26/10 ,  G02B26/12 ,  G03G15/04 ,  G06K15/12 ,  H04N1/191

    CPC分类号： H04N1/1912 ,  G06K15/1261

    摘要： A multi-beam laser ROS print system is described which is adapted to minimize banding in output prints. Multiple beams from a laser source are separated by a distance which causes the beam to scan consecutive lines in a non-consecutive scan; e.g., according to a particular beam interlacing sequence. It has been found that as a general proposition, banding decreases with increasing interlacing orders and, furhter, that once a print system error frequency, or another frequency of interest has been identified, there are a number of interlacing orders, each an optimum value, which can be introduced to reduce banding which would ordinarily result from the particular frequency error.

    摘要翻译： 描述了一种多光束激光ROS打印系统，其适于最小化输出打印中的条纹。 来自激光源的多个光束被分开一段距离，该距离使光束以非连续扫描扫描连续的行; 例如，根据特定的光束交织序列。 已经发现，作为一般命题，条带随着交错顺序的增加而减小，并且，一旦打印系统错误频率或者其他感兴趣的频率已经被识别，则存在多个交织顺序，每个都是最佳值， 其可以被引入以减少通常由特定频率误差引起的条带。

    Printer compensated for vibration-generated scan line errors
    5.
    发明授权
    Printer compensated for vibration-generated scan line errors 失效
    打印机补偿振动产生的扫描线错误

    公开(公告)号：US4884083A

    公开(公告)日：1989-11-28

    申请号：US252618

    申请日：1988-10-03

    申请人： Robert P. Loce ,  William L. Lama

    发明人： Robert P. Loce ,  William L. Lama

    IPC分类号： B41F17/00 ,  B41J2/44 ,  B41J2/47 ,  G02B26/10 ,  G02B26/12 ,  G02B27/46 ,  G03F7/20 ,  H04N1/113

    CPC分类号： B41J2/471 ,  G02B26/12 ,  G02B27/46 ,  G03F7/20 ,  H04N1/1135

    摘要： A printing system employing a raster output scanning device is compensated for the effects of motion of the medium upon which an image is being printed. An amplitude transmittance spatial filter is positioned either in an exit pupil of the "slow scan" optics of the system or in the first Fourier transform plane of a lens positioned between the scanning device and the recording medium. Several preferred transmittance functions are provided.

    摘要翻译： 采用光栅输出扫描装置的打印系统被补偿了打印图像的介质的运动效果。 振幅透过率空间滤波器位于系统的“慢扫描”光学器件的出射光瞳中，或者位于位于扫描装置和记录介质之间的透镜的第一傅里叶变换平面中。 提供了几种优选的透射功能。

    Plywood suppression in ROS systems
    6.
    发明授权
    Plywood suppression in ROS systems 失效
    胶合板抑制在ROS系统

    公开(公告)号：US5089908A

    公开(公告)日：1992-02-18

    申请号：US735664

    申请日：1991-07-26

    申请人： Ronald E. Jodoin ,  Robert P. Loce ,  William L. Lama ,  James D. Rees ,  Abd-El-Fattah A. Ibrahim ,  James J. Appel

    发明人： Ronald E. Jodoin ,  Robert P. Loce ,  William L. Lama ,  James D. Rees ,  Abd-El-Fattah A. Ibrahim ,  James J. Appel

    IPC分类号： G02B26/12 ,  H04N1/29

    CPC分类号： G02B26/123 ,  H04N1/29

    摘要： A multiple diode laser array used in a ROS scanning system is modified to reduce the effects of undesirable spatial exposure variation at the surface of certain type of layered, semi-transparent photoreceptors. The spatial absorption variation is later manifested as a "plywooding" pattern formed on output prints derived from the exposed photoreceptor. The laser array is modified to form a merged scanning beam at the photoreceptor surface of two or more diode outputs, each output operating at a different wavelength than the other. In one embodiment, a plurality of diodes, each at a different wavelength, are sequentially addressed, and an image of each diode is scanned across the photoreceptor which results in an exposure distribution that would be similar to that formed by an incoherent beam.

    摘要翻译： 修改了在ROS扫描系统中使用的多重二极管激光器阵列，以减少某些类型的分层半透明感光体表面的不期望的空间曝光变化的影响。 空间吸收变化后来表现为在从曝光的感光体得到的输出印刷品上形成的“胶合”图案。 修改激光器阵列以在两个或更多个二极管输出的感光体表面处形成合并的扫描光束，每个输出的操作波长不同于另一个。 在一个实施例中，每个处于不同波长的多个二极管被顺序地寻址，并且每个二极管的图像跨越感光体扫描，导致与由非相干光束形成的曝光分布相似的曝光分布。

    Gradient index lens array with improved image quality due to stray light reduction
    8.
    发明授权
    Gradient index lens array with improved image quality due to stray light reduction 失效
    梯度折射率透镜阵列，由于杂散光减少而具有改善的图像质量

    公开(公告)号：US4761062A

    公开(公告)日：1988-08-02

    申请号：US923455

    申请日：1986-10-27

    申请人： Robert P. Loce ,  John A. Durbin ,  William L. Lama

    发明人： Robert P. Loce ,  John A. Durbin ,  William L. Lama

    IPC分类号： G02B3/00 ,  G02B6/04

    CPC分类号： G02B3/0087 ,  G02B3/0056

    摘要： A gradient index lens array having improved stray light characteristics is enabled by coating the surfaces of the fibers comprising the array with a low transmittance, low viscosity material. The index of this material is matched to that of the fiber surface to prevent Fresnel reflection. The interstitial areas of the lens array comprises a light absorbing material. In another embodiment, stray light caused by light scattering at the end faces of the lens array is reduced by masking the end face with a mask having apertures overlying the fiber faces. The mask apertures have slightly smaller diameters to mask out the rough outer edge of the fibers.

    摘要翻译： 具有改善的杂散光特性的梯度折射率透镜阵列可以通过用低透射率，低粘度的材料涂覆包括阵列的纤维的表面来实现。 该材料的指数与纤维表面的指数匹配，以防止菲涅耳反射。 透镜阵列的间隙区域包括光吸收材料。 在另一个实施例中，通过用具有覆盖在光纤面上的孔的掩模掩蔽端面来减少由透镜阵列的端面处的光散射引起的杂散光。 掩模孔径具有略小的直径以掩盖纤维的粗糙外边缘。