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148 条记录 (耗时 0.024 秒)

    Drive apparatus for optical element array
    7.
    发明公开
    Drive apparatus for optical element array 失效
    光学元件阵列驱动装置

    公开(公告)号：EP0487971A3

    公开(公告)日：1993-07-14

    申请号：EP91119275.5

    申请日：1991-11-12

    申请人： VICTOR COMPANY OF JAPAN, LIMITED

    发明人： Takanashi, Itsuo ,  Nakagaki, Shintaro ,  Negishi, Ichiro ,  Suzuki, Tetsuji ,  Tatsumi, Fujiko ,  Takahashi, Ryusaku ,  Maeno, Keiichi ,  Yoshimura, Tsuyoshi

    IPC分类号： G06K15/12

    CPC分类号： G06K15/1247

    摘要： A drive apparatus for an optical element array includes a counter counting clock pulses and being periodically reset at a horizontal scanning period. The counter outputs first and second counter signals out of phase with each other. A latch holds a pixel-corresponding segment of an input image signal. One of clock signals out of phase with each other is selected in response to the pixel-corresponding input-signal segment held by the latch. A first comparator compares the first counter signal and the pixel-corresponding input-signal segment held by the latch, and outputs a first identity signal when the first counter signal and the pixel-corresponding input-signal segment are equal to each other. A second comparator compares the second counter signal and the pixel-corresponding input-signal segment held by the latch, and outputs a second identity signal when the second counter signal and the pixel-corresponding input-signal segment are equal to each other. A drive pulse is generated which starts in synchronism with a start of a horizontal scanning period and which ends in response to the selected clock signal and in response to the first and second identity signals. An optical element in the array is driven in response to the drive pulse.

    A pulse-width modulation device
    10.
    发明公开
    A pulse-width modulation device 失效
    脉冲宽度调制装置

    公开(公告)号：EP0499288A3

    公开(公告)日：1992-12-09

    申请号：EP92102542.5

    申请日：1992-02-14

    申请人： VICTOR COMPANY OF JAPAN, LIMITED

    发明人： Takanashi, Itsuo ,  Yamamura, Takashi ,  Ichitou, Toshikatsu ,  Namiki, Kazunori

    IPC分类号： H04N1/40

    CPC分类号： G06F1/025 ,  H04N1/4056

    摘要： A pulse-width modulation device for controlling shapes of dots printed out by a printer by regulating shapes of pulses of pulse-width modulation signals, which respectively represent gray levels of pixels of input image, according to code signals respectively indicating shapes of pulses of pulse-width modulation signals, each of which has a duration composed of time slots respectively corresponding to bits of image data representing a gray level of a pixel. The pulse-width modulation device is provided with a code converter for converting image data corresponding to each pixel of an input image into a predetermined code indicating a shape of a pulse of a corresponding pulse-width modulation signal and for outputting a code signal representing the predetermined code. The indicated shape of the pulse is formed by making the corresponding pulse modulation signal have a high level at a predetermined number of time slots thereof, which are serially counted from the time slot corresponding to the most significant bit of the image data or from the time slot corresponding to the least significant bit of the image data according to a gray level of each pixel. The pulse-width modulation device is further provided with a pulse generating circuit for receiving the code signal and for generating the pulse of the predetermined pulse-width modulation signal according to the code in response to a predetermined clock signal.