Variable reflectance mirror reflective element for exterior mirror assembly

  • US 8,506,096 B2
  • Filed: 10/01/2012
  • Issued: 08/13/2013
  • Est. Priority Date: 09/20/2002
  • Status: Active Grant
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First Claim
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1. A variable reflectance mirror reflective element suitable for use in a vehicular exterior rearview minor assembly, said minor reflective element comprising:

  • a front substrate and a rear substrate and an electrochromic medium disposed between said front and rear substrates;

    wherein said front substrate has a first surface and a second surface;

    said second surface of said front substrate having a transparent electrically conductive layer disposed thereat;

    wherein said rear substrate has a third surface and a fourth surface;

    a mirror reflector disposed at at least a portion of said third surface of said rear substrate;

    wherein said minor reflector comprises a stack of thin films and wherein said stack of thin films comprises at least one metal thin film;

    wherein said minor reflector has a sheet resistance of less than about 5 ohms per square;

    wherein at least one film of said stack of films comprises a material that has a specific resistivity of less than about 1×

    10

    2
    ohm·

    cm;

    wherein said electrochromic medium is disposed in an interpane cavity established between said third surface of said rear substrate and said second surface of said front substrate and bounded by a perimeter seal;

    wherein no part of said rear substrate extends beyond any part of said front substrate;

    wherein a perimeter layer is disposed at said second surface of said front substrate proximate a perimeter edge of said front substrate;

    wherein said perimeter layer generally conceals said perimeter seal from view by a person viewing through said front substrate; and

    wherein light that reflects off of said mirror reflector and passes through said electrochromic medium and said front substrate has a substantially untinted reflectant characteristic to a person viewing said mirror reflective element when no voltage is applied to said electrochromic medium.

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