Electrochromic mirror for vehicles with illumination and heating control

  • US 5,446,576 A
  • Filed: 11/04/1992
  • Issued: 08/29/1995
  • Est. Priority Date: 11/26/1990
  • Status: Expired due to Fees
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First Claim
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1. A rearview mirror system for a vehicle comprising:

  • an electrochromic reflective element comprising a reflective surface having a continuously variable reflectance level;

    drive circuit means for supplying a signal to said reflective element in order to establish the reflectance level of said reflective element;

    a heater;

    wherein said heater includes first and second portions at least partially insulated from each other and terminal means for connecting a source of current selectively to said first portion alone and to said first and said second portion together, wherein said first and second portions have an electrical resistance together that is greater than either said first or second portion has alone;

    control means for selectively connecting said source of current to said first and said second portions together for selectively heating said first and said second portions together at a first rate for a first period of time in order to promote uniform coloration of said reflectance element to a given reflectance level for a given level of said signal and for selectively connecting said source of current to said first portion alone for selectively heating said first portion alone at a second rate that is higher than said first rate for a second period of time.

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