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Laser beam delivery path and target proximity sensor

  • US 5,382,785 A
  • Filed: 11/15/1993
  • Issued: 01/17/1995
  • Est. Priority Date: 05/04/1992
  • Status: Expired due to Fees
First Claim
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1. An operating system for a laser diode device, including;

  • a laser diode for emitting a laser beam along a beam delivery path;

    photosensor means disposed proximate to said laser diode to receive laser diode light reflected retrograde in said beam delivery path and generate a photodiode signal;

    sampling pulse means for driving said laser diode to emit a brief sampling pulse upon power-up of said operating system;

    means for comparing said photodiode signal during said brief sampling pulse to a predetermined beam path threshold level; and

    ,means for warning of an occluded beam delivery path if said photodiode signal exceeds said predetermined beam path threshold level.

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