Laser beam printer
    1.
    发明授权
    Laser beam printer 失效
    激光束打印机

    公开(公告)号:US4712118A

    公开(公告)日:1987-12-08

    申请号:US897818

    申请日:1986-08-19

    CPC分类号: B41J13/26 G06K15/1219

    摘要: A laser beam printer includes: a recording medium for forming an image; a scanning unit for scanning a beam modulated by an image signal on the recording medium; a beam detector for detecting the position of the beam scanned by the scanning unit and outputting a synchro signal which defines the record start position on the recording medium; a sheet position detector for detecting the position, in the direction of scanning the beam, of a sheet to which the image formed on the recording medium is transferred; and a controller for controlling the output timing of the synchro signal in accordance with the position of a sheet detected by the sheet position detector.

    摘要翻译: 激光束打印机包括:用于形成图像的记录介质; 扫描单元,用于扫描由记录介质上的图像信号调制的光束; 光束检测器,用于检测由扫描单元扫描的光束的位置,并输出定义记录介质上的记录开始位置的同步信号; 纸张位置检测器,用于检测在扫描光束的方向上转印形成在记录介质上的图像的纸张的位置; 以及控制器,用于根据由片材位置检测器检测到的片材的位置来控制同步信号的输出定时。

    Safety apparatus for detecting an abnormality of power control element
    4.
    发明授权
    Safety apparatus for detecting an abnormality of power control element 失效
    用于检测功率控制元件的异常的安全装置

    公开(公告)号:US4882782A

    公开(公告)日:1989-11-21

    申请号:US96806

    申请日:1987-09-10

    IPC分类号: G05F1/10 H02H7/12

    CPC分类号: H02H7/12

    摘要: A safety apparatus for an AC control circuit has a bidirectional thyristor, a photocoupler for detecting a load current, a transistor and a self-hold circuit for checking if a detection output from the photocoupler indicates a failure of the thyristor to commutate or lack of a trigger signal and another transistor which is turned on to blow a fuse and to cut off the load current when a failure of the thyristor to commutate or lack of the trigger signal is detected.

    摘要翻译: 用于AC控制电路的安全装置具有双向晶闸管,用于检测负载电流的光电耦合器,晶体管和自保持电路,用于检查来自光电耦合器的检测输出是否指示晶闸管的故障转换或缺少 触发信号和另一个导通的熔断晶体管,以便在检测到可控硅整流或触发信号不足时,断开负载电流。