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Laser scanner safety apparatus and method

  • US 5,023,818 A
  • Filed: 09/21/1989
  • Issued: 06/11/1991
  • Est. Priority Date: 09/21/1989
  • Status: Expired due to Term
First Claim
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1. Record media scanning apparatus, comprising:

  • a laser for providing a scanning beam;

    laser power supply means for providing power to drive said laser;

    a motor for driving a movable element forming part of said scanning apparatus, said motor having sensing means associated therewith for sensing the speed of operation of said motor and for providing an output signal which varies in accordance with the speed of said motor;

    motor driver means for driving said motor;

    detection means coupled to said laser power supply means for detecting when said laser is operating and providing an output signal which varies in accordance with whether or not said laser is operating;

    logic means coupled to said detection means and to said sensing means of said motor and capable of producing a logical output signal which is dependent upon the output signals from said detection means and said sensing means of said motor;

    microprocessor means for controlling said laser power supply means and said motor driver means coupled to said logic means;

    laser operating signal coupling means coupled to said microprocessor means and to said laser power supply means; and

    motor operating signal coupling means coupled to said microprocessor means and to said motor driver means;

    whereby said microprocessor means is capable of controlling the operation of said motor and said laser power supply means in accordance with the logical output signal received from said logic means.

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