Rearview mirror assembly for vehicle

  • US 10,029,616 B2
  • Filed: 01/16/2017
  • Issued: 07/24/2018
  • Est. Priority Date: 09/20/2002
  • Status: Active Grant
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First Claim
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1. An exterior electrically variable reflectance mirror reflective element assembly suitable for use for a vehicle, said exterior electrically variable reflectance mirror reflective element assembly comprising:

  • an electrically variable reflectance mirror reflective element;

    wherein said electrically variable reflectance 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 said third 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 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 1×

    10

    3
    ohm·

    cm;

    wherein said metal material of said first metal thin film is different than said metal material of said second metal thin film;

    wherein said mirror reflector provides at least 55 percent photopic reflectance measured in accordance with Society of Automotive Engineers test procedure SAE J964a;

    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 width of said perimeter seal is at least 0.5 mm and not greater than 3 mm;

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

    wherein at least a perimeter edge portion of said rear substrate is inward of a corresponding perimeter edge portion of said front substrate by 0.1 mm to 2 mm;

    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 a vehicle normally viewing said front substrate when said exterior electrically variable reflectance mirror reflective element assembly is mounted in an exterior mirror assembly attached at an exterior portion of the vehicle;

    wherein at least a portion of said mirror reflector extends from under said perimeter seal outward towards at least a portion of said perimeter edge of said rear substrate;

    wherein said electrically variable reflectance mirror reflective element comprises a curved mirror reflective element having a more curved outboard region and a less curved inboard region, and wherein said front and rear substrates comprise aspheric substrates; and

    wherein a laser-etched demarcation demarcates said more curved outboard region of said electrically variable reflectance mirror reflective element from said less curved inboard region of said electrically variable reflectance mirror reflective element.

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