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    • 22. 发明授权
    • Light beam scanning apparatus and image forming apparatus
    • 光束扫描装置和图像形成装置
    • US06885480B2
    • 2005-04-26
    • US10929399
    • 2004-08-31
    • Kenichi KomiyaKoji TanimotoDaisuke Ishikawa
    • Kenichi KomiyaKoji TanimotoDaisuke Ishikawa
    • H04N1/053H04N1/113H04N1/12H04N1/04
    • H04N1/053H04N1/1135H04N1/12H04N2201/04712H04N2201/04732H04N2201/04744H04N2201/04782H04N2201/04793
    • A synchronizing circuit and a timing adjusting circuit set a position of an exposure area by beam scanning as an additional value of a first setting value set in dot unit corresponding to the scanning of a pixel clock period and a second setting value set in tap unit corresponding to the scanning of a period smaller than the pixel clock period. A CPU controls the synchronizing circuit and the timing adjusting circuit so that the exposed position becomes an objective position. The CPU changes the second setting value to a first predetermined value by increasing the first setting value by one dot, in the case that the additional value is increased to reach a first threshold. Further, the CPU changes the second setting value to a second predetermined value by decreasing the first setting value by one dot, in the case that the additional value of the synchronizing circuit and the timing adjusting circuit in which the first setting value is increased by one dot is decreased to reach a second threshold smaller than the first threshold.
    • 同步电路和定时调整电路通过光束扫描设置曝光区域的位置,作为对应于像素时钟周期的扫描设置的点单位的第一设定值的附加值和对应于抽头单元对应的第二设定值 到比像素时钟周期小的扫描。 CPU控制同步电路和定时调整电路,使得曝光位置成为目标位置。 在增加附加值以达到第一阈值的情况下,CPU通过将第一设定值增加一个点来将第二设定值改变为第一预定值。 此外,在将第一设定值增加1的同步电路和定时调整电路的附加值的情况下,CPU将第一设定值减小一点,CPU将第二设定值变更为第二规定值 点减小以达到小于第一阈值的第二阈值。