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11 条记录 (耗时 0.012 秒)

    Transient state liquid crystal image bar with contrast enhancement
    3.
    发明公开
    Transient state liquid crystal image bar with contrast enhancement 失效
    StabförmigesÜbergangszustands-FlüssigkristallabbildungselementmiterhöhtemKontrast。

    公开(公告)号：EP0272820A2

    公开(公告)日：1988-06-29

    申请号：EP87310601.7

    申请日：1987-12-02

    申请人： XEROX CORPORATION

    发明人： Dir, Gary A. ,  Perregaux, Alain E.

    IPC分类号： G02F1/133

    CPC分类号： G02F1/1393 ,  G02F1/13363 ,  G02F2001/133531 ,  G02F2001/133638 ,  G02F2413/01

    摘要： A transient state liquid crystal image bar (12) having enhanced contrast with lower required driving voltage. The image bar is of the type having a nematic liquid crystal cell configured as a single array of dot shutters energizable by a single frequency voltage with crossed polarizer (14) and analyzer (15). The polarizing axis of the polarizer is at 45 degrees with the liquid crystal molecules (13) in their rest state. Thus, when all the image bar shutters are energized, it is in the non-transmission condition. For bursts of light to pass, the voltage to selected dot shutters is interrupted and reapplied. In one embodiment, the improvement is achieved by an optical compensator (28) or thin prism placed between the polarizer and the liquid crystal cell. In another embodiment, a quarter-wave plate is placed between the liquid crystal cell and the analyzer, with the analyzer being rotated about the image bar's optical axis a predetermined angle from its initial crossed position with respect to the polarizer, so that there is increased extinction of the light exiting from the liquid crystal cell, when the liquid crystal material is in its normally stable energized state.

    摘要翻译： 一种瞬态液晶影像棒（12），具有较低的所需驱动电压的对比度。 该图像棒是具有向列型液晶单元的类型，该向列型液晶单元被配置为具有由具有交叉偏振器（14）和分析器（15）的单个频率电压激励的点阵列的单个阵列。 偏振器的偏振轴在液晶分子（13）处于静止状态时为45度。 因此，当所有图像条快门都通电时，它处于非传输状态。 对于猝发的光通过，所选择的百叶窗的电压被中断并重新应用。 在一个实施例中，通过放置在偏振器和液晶单元之间的光学补偿器（28）或薄棱镜来实现改进。 在另一个实施例中，四分之一波片被放置在液晶单元和分析器之间，分析器围绕图像棒的光轴以相对于偏振器的初始交叉位置为预定角度旋转，使得增加 当液晶材料处于其正常稳定的通电状态时，从液晶单元出射的光的消光。

    Digital LED printer with multiple print imaging modes
    5.
    发明公开
    Digital LED printer with multiple print imaging modes 失效
    数码相机LED Drucker mit mehreren Bilddruckarten。

    公开(公告)号：EP0663759A1

    公开(公告)日：1995-07-19

    申请号：EP95300219.3

    申请日：1995-01-13

    申请人： XEROX CORPORATION

    发明人： Corona, Stephen C. ,  Tien, Paul C. ,  Dir, Gary A. ,  Duval, David R. ,  Ambalavanar, Samuel D.

    IPC分类号： H04N1/40

    CPC分类号： H04N1/40043 ,  H04N1/40031

    摘要： A digital LED printer is described which enables improved printing of images including both text and half-tones. A plurality of LED chips (1,2, ....N) are aligned in a row to form a printbar of a length sufficient to expose the width of a recording medium, such as a photoreceptor drum or belt. Each LED chip has an associated driver chip (40) which controls the individual LED on/off time as well as the magnitude of current applied to each LED so as to maintain uniform exposure of each energized LED. The LED on/off time is controlled by selection of one of a plurality of two bit or four bit gray level strobe signals, which are decoded (38) according to system logic. The LED printbar is addressed, during each pixel time interval, along a plurality of sub-lines, the exposure levels of each sub-line differing from the other. In one technique, sub-lines are associated with either printing of text or half-tones. In another technique, the number of gray level exposures is increased by overprinting sub-lines with subsequent sub-lines of different resolutions.

    摘要翻译： 描述了一种数字LED打印机，其能够改进打印包括文本和半色调的图像。 多个LED芯片（1,2，... N）排列成一排，以形成足以暴露诸如感光鼓或带的记录介质宽度的打印条。 每个LED芯片具有相关联的驱动器芯片（40），其控制单独的LED开/关时间以及施加到每个LED的电流的大小，以便保持每个通电的LED的均匀曝光。 LED开/关时间通过选择根据系统逻辑被解码（38）的多个二位或四位灰度级选通信号之一进行控制。 在每个像素时间间隔期间沿着多个子线寻址LED打印条，每条子线的曝光水平彼此不同。 在一种技术中，子行与文本或半色调的打印相关联。 在另一种技术中，通过用不同分辨率的后续子行覆盖子行来增加灰度级曝光的数量。

    Electronically variable MTF filter for image sensor arrays
    6.
    发明公开
    Electronically variable MTF filter for image sensor arrays 失效
    用于图像传感器阵列的电子可变MTF滤波器

    公开(公告)号：EP0354029A3

    公开(公告)日：1991-09-25

    申请号：EP89307891.5

    申请日：1989-08-03

    申请人： XEROX CORPORATION

    发明人： Seachman, Ned J. ,  Taillie, Joseph P. ,  Dir, Gary A.

    IPC分类号： G02F1/13 ,  H04N1/028 ,  G02F1/133

    CPC分类号： H04N1/02805 ,  G02F1/1313 ,  H04N1/028

    摘要： A liquid crystal birefringent MTF filter 20 is permanently positioned between the lens 18 and the sensor array 15 of an image input scanner 10 to reduce image modulation at frequencies where moiré occurs, with a source of electric potential and a control switch for selectively applying the potential and switching the filter to or from a filtering state. In a variation of the first embodiment, a two-stage MTF filter is used. In a second embodiment, a tunable liquid crystal scattering MTF filter is combined with a full width sensor array.

    A multicolor liquid crystal display
    7.
    发明公开
    A multicolor liquid crystal display 失效
    MULTICOLOR液晶显示器

    公开(公告)号：EP0121305A3

    公开(公告)日：1987-03-25

    申请号：EP84300845

    申请日：1984-02-10

    申请人： XEROX CORPORATION

    发明人： Dir, Gary A.

    IPC分类号： G02F01/137 ,  G02F01/133

    CPC分类号： G02F1/13725 ,  G02F1/1335 ,  G02F1/133514

    摘要： Amulticolor display (300) which comprises a high contrast liquid crystal device (320), light source (314) and a luminance-balanced color mask (318). The liquid crystal device is the transmissive, twisted nematic type having high extinction ratio polarizers on the input and output sides and functions as a light shutter for the display. The liquid crystal material has a dichroic dye admixed therein to prevent build- up of the contrast limiting orthogonal mode electric vector of polarized light. The color mask contains different colored patches with gray surrounds, and the colored patches are luminance balanced in order that the different colored data displays are of substantially equal brightness. During the off-state there is no light bleed through so that the display presents a uniformly dark state or dead front.

    Electronically variable MTF filter for image sensor arrays
    9.
    发明公开
    Electronically variable MTF filter for image sensor arrays 失效
    Elektronisch变量MUEF-FilterfürAbbildungsanordnungen。

    公开(公告)号：EP0354029A2

    公开(公告)日：1990-02-07

    申请号：EP89307891.5

    申请日：1989-08-03

    申请人： XEROX CORPORATION

    发明人： Seachman, Ned J. ,  Taillie, Joseph P. ,  Dir, Gary A.

    IPC分类号： G02F1/13 ,  H04N1/028 ,  G02F1/133

    CPC分类号： H04N1/02805 ,  G02F1/1313 ,  H04N1/028

    摘要： A liquid crystal birefringent MTF filter 20 is permanently positioned between the lens 18 and the sensor array 15 of an image input scanner 10 to reduce image modulation at frequencies where moiré occurs, with a source of electric potential and a control switch for selectively applying the potential and switching the filter to or from a filtering state. In a variation of the first embodiment, a two-stage MTF filter is used.
    In a second embodiment, a tunable liquid crystal scattering MTF filter is combined with a full width sensor array.

    摘要翻译： 液晶双折射MTF滤光器20永久地定位在图像输入扫描器10的透镜18和传感器阵列15之间，以减少发生波纹的频率下的图像调制，并具有电位源和用于选择性地施加电势的控制开关 并且将过滤器切换到过滤状态或从过滤状态切换。 在第一实施例的变型中，使用两级MTF滤波器。 在第二实施例中，可调谐液晶散射MTF滤波器与全宽度传感器阵列组合。

    Transient state liquid crystal image bar with contrast enhancement
    10.
    发明公开
    Transient state liquid crystal image bar with contrast enhancement 失效
    瞬态状态液晶图像条与对比度增强

    公开(公告)号：EP0272820A3

    公开(公告)日：1988-10-05

    申请号：EP87310601

    申请日：1987-12-02

    申请人： XEROX CORPORATION

    发明人： Dir, Gary A. ,  Perregaux, Alain E.

    IPC分类号： G02F01/133

    CPC分类号： G02F1/1393 ,  G02F1/13363 ,  G02F2001/133531 ,  G02F2001/133638 ,  G02F2413/01

    摘要： A transient state liquid crystal image bar (12) having enhanced contrast with lower required driving voltage. The image bar is of the type having a nematic liquid crystal cell configured as a single array of dot shutters energizable by a single frequency voltage with crossed polarizer (14) and analyzer (15). The polarizing axis of the polarizer is at 45 degrees with the liquid crystal molecules (13) in their rest state. Thus, when all the image bar shutters are energized, it is in the non-transmission condition. For bursts of light to pass, the voltage to selected dot shutters is interrupted and reapplied. In one embodiment, the improvement is achieved by an optical compensator (28) or thin prism placed between the polarizer and the liquid crystal cell. In another embodiment, a quarter-wave plate is placed between the liquid crystal cell and the analyzer, with the analyzer being rotated about the image bar's optical axis a predetermined angle from its initial crossed position with respect to the polarizer, so that there is increased extinction of the light exiting from the liquid crystal cell, when the liquid crystal material is in its normally stable energized state.