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    • 4. 发明授权
    • Laser driving apparatus and image forming apparatus using the same
    • 激光驱动装置及使用其的图像形成装置
    • US6144680A
    • 2000-11-07
    • US114512
    • 1998-07-14
    • Hajime KajiTomobumi Nakayama, deceasedMichiharu MasudaTakayuki Kawakami
    • Hajime KajiTomobumi Nakayama, deceasedMichiharu MasudaTakayuki Kawakami
    • H01S5/06H01S5/042H01S5/0683H01S5/40H04N1/40H01S3/00
    • H04N1/4005H01S5/4025H04N1/40037H01S5/042H01S5/0683
    • A laser driving apparatus for driving a plurality of laser beam sources includes a plurality of laser beam sources, a photodetector for detecting amounts of laser beams emitted from the plurality of laser beam sources, a plurality of current sources for driving the plurality of laser beam sources, a plurality of switches respectively interposed between the plurality of laser beam sources and the plurality of current sources, a plurality of controllers for controlling light amounts of the plurality of laser beam sources by comparing the light amounts detected by the photodetector with a reference value and controlling current amounts of the plurality of current sources in accordance with the comparison values, a plurality of sample/hold circuits respectively interposed between the photodetector and the plurality of controllers, and timing adjustment device for outputting a plurality of timing signals of a first type for controlling the plurality of switches and a plurality of timing signals of a second type for controlling the plurality of sample/hold circuits. The timing adjustment device outputs the plurality of timing signals of the first type for time-divisionally turning on the plurality of switches and sequentially making the plurality of laser beam sources to emit laser beams one by one. The plurality of timing signals of the second type making each of the plurality of sample/hold circuits corresponding to the plurality of switches sample while each of the plurality of switches is on. The plurality of timing signals of the second type making each of the plurality of sample/hold circuits sample while any one of the switches which are turned on before a corresponding switch is on.
    • 用于驱动多个激光束源的激光驱动装置包括:多个激光束源,用于检测从所述多个激光束源,用于驱动所述多个激光束源的多个电流源发射的激光束的量的光电检测器 中,多个分别插入在多个激光束源和所述多个电流源,用于通过比较由所述光检测器与参考值检测的光量控制所述多个激光光源的光量的多个控制器之间的开关 控制电流量的多个电流源的根据比较值,多个分别插入在光电探测器和所述多个控制器,以及定时调整装置之间,用于输出多个用于定时的第一类型的信号的采样/保持电路的 控制多个开关和多个定时信号 用于控制多个采样/保持电路的第二类型的Nals。 定时调整装置输出第一类型的多个定时信号,用于分时地接通多个开关,并依次使多个激光束源逐个发射激光束。 在多个开关中的每一个接通时,使与多个开关相对应的多个采样/保持电路中的每一个采样的第二类型的多个定时信号被采样。 多个采样/保持电路中的每一个采样的第二类型的多个定时信号在相应的开关导通之前被接通的任何一个开关中采样。
    • 7. 发明授权
    • Laser control apparatus with a current detecting and interrupting system
    • 具有电流检测和中断系统的激光控制装置
    • US06347105B1
    • 2002-02-12
    • US09411393
    • 1999-10-04
    • Tomobumi NakayamaMichiharu MasudaHisatsugu TaharaAkio ItoYukio Yokoyama
    • Tomobumi NakayamaMichiharu MasudaHisatsugu TaharaAkio ItoYukio Yokoyama
    • H01S300
    • H01S5/06825
    • An image forming apparatus is arranged to form an image with laser light emitted from a semiconductor laser source, and is constructed so as to protect the laser source from a breakdown, by regulating electric current flowing to the laser source no matter when an adjusting circuit for adjusting the light amount of the semiconductor laser source is apt to supply the electric current that could break the laser source, to the laser source. The apparatus is constructed in such structure that during an automatic light amount control period the laser light amount emitted from the semiconductor laser source is detected and a current source circuit is made inactive when the light amount detected is over a set light amount and that during periods other than the control period the electric current flowing to the semiconductor laser is detected and the current source circuit is made inactive when the light amount detected becomes over a fixed ratio times the current detected during the automatic light amount control period. In this way, the protection circuit can operate effectively anytime of emission of the laser source, so as to protect the laser source from the breakdown.
    • 图像形成装置被配置成通过从半导体激光源发射的激光形成图像,并且被构造成通过调节流向激光源的电流来保护激光源免受击穿,不管当调节电路 调整半导体激光源的光量易于将激光源的电流提供给激光源。 该装置的结构是这样一种结构,即在自动光量控制期间,检测出半导体激光源发出的激光量,并且当检测到的光量超过设定的光量时,电流源电路被激活,而在期间 当检测到的光量变得超过在自动光量控制周期期间检测到的电流的固定比率时,检测到流过半导体激光器的电流,并且检测流过半导体激光器的电流,并使电流源电路无效。 以这种方式,保护电路可以随时发射激光源,以保护激光源免受击穿。