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。

公开(公告)号：US5223857A

公开(公告)日：1993-06-29

申请号：US756935

申请日：1991-09-09

申请人： Robert P. Loce ,  Martin E. Banton ,  Melvin E. Swanberg ,  William L. Lama ,  Michael S. Cianciosi ,  Susan E. Feth ,  Kevin J. Garcia ,  Peter K. Wu ,  Girmay K. Girmay

发明人： Robert P. Loce ,  Martin E. Banton ,  Melvin E. Swanberg ,  William L. Lama ,  Michael S. Cianciosi ,  Susan E. Feth ,  Kevin J. Garcia ,  Peter K. Wu ,  Girmay K. Girmay

IPC分类号： B41J2/44 ,  G02B26/10 ,  G02B26/12 ,  G06K15/12 ,  H04N1/113 ,  H04N1/40

CPC分类号： G06K15/1204 ,  G02B26/127 ,  H04N1/40037

摘要： A pulsed imaging Raster Output Scanner utilizes pulse width modulation in conjunction with spatial filtering to form three exposure levels at the surface of a recording medium, one of the levels associated with a specific color.

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。

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。

公开(公告)号：US4571022A

公开(公告)日：1986-02-18

申请号：US598756

申请日：1984-04-10

申请人： William L. Lama ,  James D. Rees

发明人： William L. Lama ,  James D. Rees

IPC分类号： G02B6/04 ,  G02B3/00 ,  G02B6/06 ,  G02B6/08 ,  G02B27/18

CPC分类号： G02B3/0087 ,  G02B3/0056 ,  G02B6/06

摘要： An exemplary two-row design for a reduction/enlargement gradient index lens is provided. The gradient index fibers of each row are aligned in the length direction so that the fiber axis lies along respective symmetrical planes. These planes are tilted with respect to each other and with respect to a plane normal to the object and image planes by some small angle. The array images objects in an object plane onto an image parallel plane of a magnification dependent on the system parameter. In this configuration, the center fiber of one row is aligned such that a plane extending through the axis of the center fiber in the width direction of the lens makes a right angle with the object and image planes. A further characteristic of the two-row array is that adjacent fibers in adjoining rows are offset to provide the required contiguous image at the image plane and to optimize the exposure uniformly.

摘要翻译： 提供了用于缩小/放大梯度折射率透镜的示例性两行设计。 每行的梯度折射率纤维在长度方向上对准，使得光纤轴线沿着相应的对称平面。 这些平面相对于彼此倾斜并且相对于垂直于物体和图像平面的平面倾斜一些小的角度。 将物体平面中的对象数组映射到取决于系统参数的放大倍率的图像平行平面上。 在这种构造中，一行的中心纤维被对准，使得在透镜的宽度方向上延伸穿过中心光纤的轴线的平面与物体和像面成直角。 两列阵列的另一个特征是相邻行中的相邻光纤被偏移以在图像平面处提供所需的连续图像并且均匀地优化曝光。

公开(公告)号：US4071799A

公开(公告)日：1978-01-31

申请号：US783904

申请日：1977-04-01

申请人： Thomas J. Hammond ,  William L. Lama

发明人： Thomas J. Hammond ,  William L. Lama

IPC分类号： H01J61/52

CPC分类号： H01J61/523

摘要： A low pressure sodium vapor lamp including a sodium vapor discharge tube and a light reflector partially surrounding the discharge tube and defining a light transmission aperture for desired directional light output. The light reflector is in tangential contact with the discharge tube on the surface thereof opposite to the light aperture. The contact between discharge tube and light reflector provides a thermal coupling for heat conduction from the discharge tube. The area of this thermal coupling thus becomes the coolest portion of the discharge tube, the "cold spot" of the lamp where excess sodium is condensed.

摘要翻译： 一种低压钠蒸汽灯，包括钠蒸气放电管和部分围绕放电管的光反射器，并限定用于所需定向光输出的光传输孔。 光反射器与放电管在与光孔相对的表面上切向接触。 放电管和光反射器之间的接触提供了热耦合，用于从放电管的热传导。 因此，该热耦合的面积成为放电管的最冷部分，即过量的钠被冷凝的灯的“冷点”。

公开(公告)号：US5477317A

公开(公告)日：1995-12-19

申请号：US927751

申请日：1992-08-10

申请人： Cyril G. Edmunds ,  William L. Lama

发明人： Cyril G. Edmunds ,  William L. Lama

IPC分类号： B41J2/44 ,  B41J2/45 ,  B41J2/455 ,  G03G15/01 ,  G06K15/12 ,  H04N1/50 ,  H04N1/56

CPC分类号： H04N1/56 ,  G03G15/011 ,  G06K15/129 ,  H04N1/508

摘要： An apparatus for correcting color images in an electrophotographic printing machine in which a first image is developed on a photoconductive surface, the second and subsequent images are superimposed over the first developed image. The apparatus includes an input device for inputting an image signal having a plurality of color components. An image processing unit processes the inputted signal. The image processing unit includes an adaptive exposure processor that modulates the exposure level of a raster output scanner (ROS) for a given pixel as a function of toner previously developed at the pixel site, thereby allowing toner layers to be made independent of each other.

摘要翻译： 一种用于在电子照相印刷机中校正彩色图像的装置，其中第一图像在光电导表面上显影，第二和后续图像叠加在第一显影图像上。 该装置包括用于输入具有多个颜色分量的图像信号的输入装置。 图像处理单元处理输入的信号。 图像处理单元包括自适应曝光处理器，该自适应曝光处理器根据先前在像素位置显影的调色剂调节给定像素的光栅输出扫描器（ROS）的曝光水平，从而使调色剂层彼此独立。

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。

公开(公告)号：US4801978A

公开(公告)日：1989-01-31

申请号：US139391

申请日：1987-12-30

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

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

IPC分类号： G03G15/00 ,  G03G15/32 ,  G06K15/12 ,  H04N1/04 ,  H04N1/047 ,  H04N1/12 ,  H04N1/193 ,  H04N1/401 ,  G03B27/72

CPC分类号： H04N1/4015 ,  G03G15/04045 ,  G03G15/326 ,  G03G15/5033 ,  G06K15/1204 ,  H04N1/0473 ,  H04N1/12 ,  H04N1/193 ,  H04N2201/0471 ,  H04N2201/04767

摘要： In an electronic printer which utilizes an image write bar, a control circuit is provided to compensate for the effects of vibration in a rotating photoconductive member, typically a photoreceptor drum. In one embodiment an encoder is positioned so as to detect spatial displacements of indicia affixed to the photoconductor surface, Correction signals are generated and sent to control circuits which adjust the on/off timing of the write bar operation and/or the intensity of the image bar output. This adjustment results in compensation for the effects of photoconductor vibration.

摘要翻译： 在利用图像写入条的电子打印机中，提供控制电路以补偿旋转的感光体（通常是感光鼓）中的振动的影响。 在一个实施例中，定位编码器以便检测贴在感光体表面上的标记的空间位移，校正信号被产生并发送到控制电路，该控制电路调整写入条操作的开/关定时和/或图像的强度 栏输出。 这种调整可以补偿光电导体振动的影响。

公开(公告)号：US4774546A

公开(公告)日：1988-09-27

申请号：US9653

申请日：1987-01-28

申请人： Stephen C. Corona ,  William L. Lama ,  Douglas W. Story ,  Donald A. McTarnaghan ,  Gary A. Dir

发明人： Stephen C. Corona ,  William L. Lama ,  Douglas W. Story ,  Donald A. McTarnaghan ,  Gary A. Dir

IPC分类号： G03G15/04 ,  G03G15/00

CPC分类号： G03G15/04018

摘要： An electrophotographic reproduction device is described which is capable of forming images of an original document modified by information added to or replacing information of the original. A latent image of the document is formed on a photosensitive surface and a portion of the image, in a first embodiment, is maintained at the original charge level. This fully charged section is subsequently discharged in an image-wise pattern by a compact annotator device. The annotator includes an illumination source, an addressable light modulator device such as a liquid crystal panel and a lens array for forming the modulated light pattern onto the photosensitive surface.

摘要翻译： 描述了一种电子照相再现装置，其能够形成通过添加到或替换原稿的信息的信息而修改的原始文档的图像。 在第一实施例中，文件的潜像形成在感光表面上并且图像的一部分被保持在原始的充电水平。 该充满电的部分随后以紧凑的注释器装置以图像方式排出。 注释器包括照明源，诸如液晶面板的可寻址光调制器装置和用于将调制光图案形成在感光表面上的透镜阵列。