Exterior rearview mirror assembly

  • US 9,073,491 B2
  • Filed: 08/04/2014
  • Issued: 07/07/2015
  • Est. Priority Date: 09/20/2002
  • Status: Active Grant
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First Claim
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1. An exterior rearview mirror assembly suitable for use for a vehicle, said exterior rearview mirror assembly comprising:

  • a casing portion;

    wherein said casing portion comprises a variable reflectance mirror reflective element;

    an attachment portion;

    wherein said attachment portion is configured for attaching at a side of a vehicle;

    wherein said mirror reflective element comprises 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 and wherein a transparent electrically conductive layer is disposed at said second surface of said front substrate;

    wherein said rear substrate has a third surface and a fourth surface and wherein a mirror reflector is disposed at at least a portion of a surface of said rear substrate;

    wherein said mirror reflector comprises a stack of thin films and wherein said stack of thin films comprises at least a first metal thin film and a second metal thin film;

    wherein said first metal thin film is formed of a metal material that has a specific resistivity of less than about 1×

    10

    3
    ohm·

    cm;

    wherein said second metal thin film is formed of a metal material that has a specific resistivity of less than about 1×

    10

    3
    ohm·

    cm;

    wherein said electrochromic medium is disposed in an interpane cavity between said third surface of said rear substrate and said second surface of said front substrate and is 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, and wherein said perimeter layer comprises a reflective perimeter layer;

    wherein said perimeter layer comprises at least one metal thin film and wherein said perimeter layer is electrically conductive;

    wherein said perimeter layer generally conceals said perimeter seal from view by a driver of the vehicle normally viewing said front substrate when said exterior rearview mirror assembly is mounted at the vehicle;

    wherein said exterior rearview mirror assembly comprises a light source;

    wherein said light source comprises a light source of an indicator;

    wherein said light source comprises at least one light emitting diode that passes less than about 75 milliamps forward current when powered; and

    wherein said indicator is disposed rearward of said mirror reflective element and, when actuated, illuminates through said mirror reflective element.

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