Exterior mirror element with wide angle portion

  • US 7,887,204 B2
  • Filed: 09/29/2010
  • Issued: 02/15/2011
  • Est. Priority Date: 05/23/2007
  • Status: Active Grant
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First Claim
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1. An electrochromic mirror reflective element suitable for use in an exterior rearview mirror assembly of a vehicle, said electrochromic mirror reflective element comprising:

  • a front glass substrate having a first surface and a second surface;

    a rear glass substrate having a third surface and a fourth surface;

    an electrochromic medium disposed between said front and rear glass substrates, wherein said electrochromic medium is bounded by a seal;

    said electrochromic mirror reflective element comprising a principal planar reflector portion and an auxiliary wide angle curved portion;

    wherein said principal planar reflector portion comprises a principal mirror reflector disposed at said rear glass substrate;

    wherein said auxiliary wide angle curved portion comprises one of (a) a curved recess established at a region of said second surface of said front glass substrate by at least one of grinding and ablating and (b) a curved recess established at a region of said fourth surface of said rear glass substrate by at least one of grinding and ablating;

    wherein said auxiliary wide angle curved portion comprises an auxiliary mirror reflector coated at said curved recess;

    wherein said first surface of said front glass substrate comprises a generally planar surface;

    wherein said third surface of said rear glass substrate comprises a generally planar surface;

    wherein said curved recess has a cross-dimension size that is in the range from about 30 millimeters to about 80 millimeters;

    wherein said curved recess comprises a radius of curvature that is in the range from about 200 millimeters to about 1,000 millimeters; and

    wherein said curved recess has a maximum recess depth that is in the range from about 0.11 millimeters to about 4.04 millimeters.

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