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Micro-current sensing auto-adjusting heater system for eye-shield

  • US 9,072,591 B2
  • Filed: 11/29/2014
  • Issued: 07/07/2015
  • Est. Priority Date: 02/16/2012
  • Status: Active Grant
First Claim
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1. An eye-shield condensation prevention system comprising:

  • an eye-shield adapted for protecting a user'"'"'s eyes, said eye-shield having a surface area divisible into at least one region for facilitating region heating of said eye-shield to a desired temperature;

    a power source;

    at least one pulse-width modulator;

    at least one microcomputer;

    at least one heating element on and corresponding with the at least one region for facilitating region heating of said eye-shield, said at least one heating element operatively connected to and corresponding with said at least one pulse-width modulator;

    a sensing circuit for comparing voltage sensed from said power source and heating element resistance voltage;

    and at least one circuit interconnecting said power source, said at least one pulse-width modulator, said at least one microcomputer, said at least one corresponding heating element for heating said eye-shield and said sensing circuit, wherein said at least one microcomputer relays information to said at least one pulse-width modulator that controls current to maintain the temperature of said at least one heating element region to a temperature above an anticipated dew point of an operating environment, said microcomputer determining heating element resistance from said sensing circuit and adjusting said pulse-width modulator'"'"'s control of current to said heater to compensate for variations in resistance that might otherwise be encountered from at least one of one eye-shield region to another eye-shield region and one eye-shield to another eye-shield.

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