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    • 6. 发明授权
    • Method and apparatus for determining a correction pattern of periodical
unevenness of an apparatus in which optical beams are reflected by a
rotating polygonal mirror and scan a recording body
    • 用于确定光束由旋转多面镜反射并扫描记录体的装置的周期性不均匀性的校正图案的方法和装置
    • US5845054A
    • 1998-12-01
    • US681920
    • 1996-07-29
    • Fumihiko Fukunaga
    • Fumihiko Fukunaga
    • G02B26/10H04N1/113H04N1/401H04N1/40
    • H04N1/4015
    • An apparatus for forming an image corresponding to an input image signal, includes a light beam generator for generating a light beam; a driver for driving the light beam generator; and an image outputting device for scanning the generated light beam which has been reflected by a rotary polygonal mirror to a recording medium in a primary direction and, for moving the recording medium in a secondary direction substantially perpendicular to the primary direction so that the image is formed. A periodical modulation signal generator changes a phase or an amplitude of a first reference signal including a fundamental frequency having a period corresponding to one rotation of the rotary polygonal mirror, and generates a plurality of periodical modulation signals having different phases or different amplitudes from each other. A multiplier multiplies a second reference signal having a predetermined frequency value by the plurality of periodical modulation signals respectively. A controller controls the driver and the image outputting device in accordance with a plurality of multiplied periodical signals, and forms images respectively corresponding to the plurality of multiplied periodical signals. A periodical modulation signal inputting device inputs a first periodical modulation signal corresponding to a first position on the recording medium, and a second periodical modulation signal corresponding to a second position different from the first position. A calculator generates an unevenness correction signal in response to the inputted first and second periodical modulation signals.
    • 一种用于形成对应于输入图像信号的图像的装置,包括用于产生光束的光束发生器; 用于驱动光束发生器的驱动器; 以及图像输出装置,用于将已经被旋转多面镜反射的所产生的光束沿主要方向扫描到记录介质,并且用于沿着与主要方向基本垂直的次要方向移动记录介质,使得图像是 形成。 周期性调制信号发生器改变包括具有与旋转多面镜的一个旋转相对应的周期的基频的第一参考信号的相位或幅度,并且产生具有彼此不同相位或不同振幅的多个周期性调制信号 。 乘法器分别乘以具有预定频率值的第二参考信号与多个周期性调制信号。 控制器根据多个相乘周期信号控制驱动器和图像输出装置,并且形成分别对应于多个倍增周期信号的图像。 周期性调制信号输入装置输入对应于记录介质上的第一位置的第一周期性调制信号和对应于与第一位置不同的第二位置的第二周期调制信号。 计算器响应于输入的第一和第二周期性调制信号产生不平坦校正信号。