Light beam scanning apparatus for use with image forming apparatus
    3.
    发明授权
    Light beam scanning apparatus for use with image forming apparatus 失效
    用于图像形成装置的光束扫描装置

    公开(公告)号:US06243123B1

    公开(公告)日:2001-06-05

    申请号:US08919274

    申请日:1997-08-28

    IPC分类号: B41J247

    摘要: In a digital copying machine using a multi-beam optical system, a light beam position detector situated on a line extended from the surface of a photosensitive drum detects the passing position of each light beam scanned by a polygon mirror rotated by a polygon motor. A CPU calculates control amounts for galvanomirrors by using a beam position detector output processor, on the basis of the detection result of the beam position detector. Based on the calculated control amounts, galvanomirror drive circuits drive the galvanomirrors, thereby to control the positions of the beams in a sub-scan direction. The passing positions of the beams can be precisely detected with no special precision in assembling the optical system. In addition, the positions of the beams in the sub-scan direction can be controlled at predetermined positions, even if some change occurs in the structure of the optical system due to a variation in ambience or a variation with the passing of time.

    摘要翻译: 在使用多光束光学系统的数字复印机中,位于从感光鼓表面延伸的线上的光束位置检测器检测由多面镜马达旋转的多面镜扫描的每个光束的通过位置。 CPU根据光束位置检测器的检测结果,通过使用光束位置检测器输出处理器来计算电流计镜的控制量。 基于计算出的控制量,电流镜驱动电路驱动电流镜,从而控制光束在副扫描方向上的位置。 在组装光学系统时,可以精确地检测光束的通过位置,没有特别的精度。 此外,即使由于环境变化或随着时间的流逝的变化,光学系统的结构发生一些变化,也可以将子扫描方向上的光束的位置控制在预定位置。

    Image forming apparatus and image forming method
    10.
    发明授权
    Image forming apparatus and image forming method 失效
    图像形成装置及图像形成方法

    公开(公告)号:US06392684B1

    公开(公告)日:2002-05-21

    申请号:US09606744

    申请日:2000-06-29

    IPC分类号: B41J247

    CPC分类号: B41J2/473 G02B26/123

    摘要: There is provided an image forming apparatus which can implement digital control of a laser beam scan (analog amount) that moves at high speed, without using any high-speed, multi-bit A/D converter. Upon executing a digital process on the basis of analog detection value Vo corresponding to the passage position or light beam power of a light beam with which a photosensitive drum is irradiated, comparator CMP0, comparison reference value (threshold value) Vr of which changes in correspondence with detection value (integration output) Vo, is used. New comparison reference value Vr is supplied to comparator CMP0 on the basis of digital data BMDA corresponding to output CMPOUT of this comparator.

    摘要翻译: 提供了一种图像形成装置,其可以实现高速移动的激光束扫描(模拟量)的数字控制,而不使用任何高速,多位A / D转换器。 在基于与照射感光鼓的光束的通过位置或光束功率相对应的模拟检测值Vo执行数字处理时,比较器CMP0,其对应的比较基准值(阈值)Vr变化 具有检测值(积分输出)Vo。 基于对应于该比较器的输出CMPOUT的数字数据BMDA,将新的比较参考值Vr提供给比较器CMP0。