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    • 3. 发明授权
    • Power supply for discharge lamp
    • 放电灯电源
    • US4687971A
    • 1987-08-18
    • US794514
    • 1985-11-04
    • Norimitsu Shimizu
    • Norimitsu Shimizu
    • H05B41/19H05B41/32H05B37/00
    • H05B41/19H05B41/32
    • A power supply circuit comprises a single discharge capacitor having a charging sufficient to trigger discharge in a discharge lamp. The discharge capacitor is associated with means for accumulating energy, with which it is charged. The energy accumulating means receives commercially available alternating current and applies the accumulated energy to the discharge capacitor to charge the latter. The power supply circuit may include an auxiliary capacitor which has a smaller capacitance and higher potential rating than the discharge capacitor. The auxiliary capacitor may have a potential rating sufficient to activate the discharge lamp alone. The discharge capacitor cooperates with the auxiliary capacitor to define discharge period. Preferably, the power supply circuit may include means for blocking or shutting off power supply at a given timing to precisely control the discharge period. Such power supply blocking means is especially advantageous for controlling the quantity of light to be emitted by the discharge lamp. The discharge capacitor and the auxiliary capacitor are controlled so as to perform a two-stage flash which includes a first stage with a brief, relatively strong flash and a second stage with a longer, relatively weak flash. This flash is advantageous for fixing toner images with low- and high-toner-density components. Alternatively, the discharge period may be controlled to within a given period to achieve good fixation of the toner image without causing significant noise or smell.
    • 电源电路包括具有足以在放电灯中触发放电的充电的单个放电电容器。 放电电容器与用于蓄积能量的装置相关联,由此充电。 能量积存装置接收商业上可获得的交流电流,并将累积的能量施加到放电电容器以对其进行充电。 电源电路可以包括具有比放电电容器更小的电容和更高的电位额定值的辅助电容器。 辅助电容器可以具有足以单独激活放电灯的电位额定值。 放电电容器与辅助电容器配合以确定放电周期。 优选地,电源电路可以包括用于在给定时间阻塞或关闭电源以精确控制放电周期的装置。 这种电源阻断装置对于控制放电灯发射的光量是特别有利的。 放电电容器和辅助电容器被控制以便执行两级闪光,其包括具有短暂的较强闪光的第一级和具有较长的较弱的闪光的第二级。 该闪光对于用低和高调色剂浓度组分定影调色剂图像是有利的。 或者,可以将放电周期控制在给定的时间段内以实现调色剂图像的良好的固定,而不会引起显着的噪音或气味。