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    DIRT INSENSITIVE OPTICAL PAPER PATH SENSOR
    2.
    发明专利
    DIRT INSENSITIVE OPTICAL PAPER PATH SENSOR 未知

    公开(公告)号：CA1240754A

    公开(公告)日：1988-08-16

    申请号：CA491274

    申请日：1985-09-20

    Applicant: XEROX CORP

    Inventor： HUBBLE FRED F III ,  BULLOCK RANDOLPH A ,  CHEUNG LI-FUNG ,  CRUMRINE ROBERT E ,  MARTIN JAMES P ,  WHITE PETER P ,  ZOMORRODI MEHRDAD

    IPC: G01V8/12 ,  B65H7/14 ,  G03G15/00 ,  G01N21/86

    Abstract: The present invention is concerned with a self-adjusting document sensor compensating for degradation of the sensor system. A suitable light source and a detector are provided, the output of the detector being fed into an amplifier whose gain depends upon a feedback signal. Periodically, the output of the amplifier is compared to a reference. If the output of the amplifier falls below the reference, a pulse is sent to a ripple counter whose digital output is fed back to the amplifier to change the gain of the amplifier.If the detector is an unbiased photodiode operating in the transconductance mode, the leakage currents and their subsequent effect on output with amplifier gain changes will be minimized.

    PHASE CONTROLLED REGULATED POWER SUPPLY
    3.
    发明专利
    PHASE CONTROLLED REGULATED POWER SUPPLY 未知

    公开(公告)号：CA1195374A

    公开(公告)日：1985-10-15

    申请号：CA403207

    申请日：1982-05-18

    Applicant: XEROX CORP

    Inventor： BULLOCK RANDOLPH A ,  MASON LAWRENCE J

    IPC: G05F1/56 ,  H05B39/04 ,  G05F1/44

    Abstract: A circuit is provided for regulating the application of power to a load which is relatively insensitive to rapid power fluctuation of the type exemplified by typical AC line sources. In one embodiment, an AC line source is applied, via a full wave rectifier, at a controlled rate to a tungsten lamp whose operation is controlled by a transistor switching network. The transistor operation, in turn, is controlled by comparing a portion of the rectified signal with a signal proportional to the light output of the lamp.

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