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    • 7. 发明授权
    • Laser scanning unit having automatic power control function
    • 激光扫描装置具有自动功率控制功能
    • US5832012A
    • 1998-11-03
    • US703699
    • 1996-08-27
    • Yoshiyuki ArakiTakeshi Maruyama
    • Yoshiyuki ArakiTakeshi Maruyama
    • B41J2/44B41J2/47G02B26/10G02B26/12H01S5/06H04N1/23H01S3/103
    • G02B26/127B41J2/471
    • A laser scanning unit emits a laser beam for scanning a surface within a predetermined scanning range. The laser scanning unit has a laser diode, and a laser diode controller for controlling the laser diode to emit the laser beam. The laser beam has an intensity set in accordance with image data corresponding to one of a plurality of predetermined graduation steps within an intensity range defined by a first intensity and a second intensity greater than the first intensity. The laser scanning unit is further provided with a first adjusting system for adjusting the first intensity to become a first predetermined intensity, and a second adjusting system for adjusting the second intensity to become a second predetermined intensity. One of the first adjusting system and the second adjusting system is actuated during each scanning operation, and are actuated alternately during successive scanning operations.
    • 激光扫描单元发射用于在预定扫描范围内扫描表面的激光束。 激光扫描单元具有激光二极管和用于控制激光二极管发射激光束的激光二极管控制器。 激光束具有根据与由第一强度和大于第一强度的第二强度限定的强度范围内的多个预定刻度步骤之一相对应的图像数据设置的强度。 激光扫描单元还设置有用于将第一强度调整为第一预定强度的第一调节系统和用于调节第二强度以变为第二预定强度的第二调节系统。 在每次扫描操作期间,第一调节系统和第二调节系统中的一个被致动,并且在连续扫描操作期间被交替致动。
    • 8. 发明授权
    • Light intensity control circuit for an optical scanning unit
    • 用于光学扫描单元的光强控制电路
    • US5473153A
    • 1995-12-05
    • US296413
    • 1994-08-26
    • Yoshiyuki ArakiSatoshi Takami
    • Yoshiyuki ArakiSatoshi Takami
    • B41J2/44G02B26/10G06K15/12H04N1/40G01J1/32
    • H04N1/4005G06K15/1209H04N1/40037
    • A light intensity control circuit for an optical scanning device in which an intensity of a beam emitted by a laser diode, is modulated in accordance with an image signal. The image signal includes information about gradation levels of an image to be formed by the scanning device on a photoconductive surface. A first control circuit sets a first intensity value of the beam corresponding to a minimum gradation level of the image to be formed, and a second circuit sets a second intensity value of the beam corresponding to a maximum gradation level of the image to be formed. A driving circuit drives the laser diode such that the intensity of the beam is determined in accordance with the image signal and a difference between the first intensity value and the second intensity value.
    • 一种用于光学扫描装置的光强度控制电路,其中由激光二极管发射的光束的强度根据图像信号进行调制。 图像信号包括关于由光电导表面上的扫描装置形成的图像的灰度级的信息。 第一控制电路设置对应于要形成的图像的最小灰度级的光束的第一强度值,并且第二电路设置与要形成的图像的最大灰度级相对应的光束的第二强度值。 驱动电路驱动激光二极管,使得根据图像信号和第一强度值与第二强度值之间的差确定光束的强度。