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    • 9. 发明授权
    • Transistor circuit for reducing current after ignition in a metal paper
printer
    • 用于在金属打印机中降低点火后的电流的晶体管电路
    • US4575740A
    • 1986-03-11
    • US477559
    • 1983-03-21
    • Gottfried GoldrianVolker Rudolph
    • Gottfried GoldrianVolker Rudolph
    • B41J2/425G01D15/08H03K17/0422H04N1/23
    • B41J2/425G01D15/08H03K17/0422Y10T307/865
    • To obtain a good print quality in metal paper printers, the print current, after ignition of the arc, must be rapidly reduced to a fraction of the value necessary for ignition. For this purpose, two transistor power stages (T3, T4) are connected to the print electrode (2). Their partial currents form the print current, whose rapid reduction after ignition of the arc is obtained by the two transistor power stages being operated at voltages (U2, U3) of different magnitude. The second transistor stage (T4) is operated at a voltage (U3), whose magnitude corresponds to the drop in potential occurring upon ignition between the grounded metal layer (3) of the record carrier (4) and the print electrode. As a result, the second transistor stage is switched off when a diode (D) connected to it becomes non-conductive.
    • 为了在金属纸打印机中获得良好的打印质量,电弧点火之后的打印电流必须快速降低到点火所需值的一小部分。 为此,两个晶体管功率级(T3,T4)连接到打印电极(2)。 它们的部分电流形成打印电流,其通过在不同大小的电压(U2,U3)下操作的两个晶体管功率级获得电弧点火之后的快速减小。 第二晶体管级(T4)以电压(U3)工作,电压(U3)的大小对应于在记录载体(4)的接地金属层(3)和印刷电极之间点火时发生的电位降低。 结果,当与其连接的二极管(D)变得不导通时,第二晶体管级被切断。