Electrochromic rearview mirror for vehicles with constant light transmitting area

  • US 5,406,414 A
  • Filed: 09/02/1993
  • Issued: 04/11/1995
  • Est. Priority Date: 04/27/1992
  • Status: Expired due to Term
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First Claim
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1. An electrochromic rearview mirror for a vehicle comprising:

  • first and second spaced, optically transparent elements, each having a front and rear surface and defining a space between said rear surface of said first element and said front surface of said second element;

    a reflective layer on one surface of said second optically transparent element;

    at least one optically transparent interlayer sandwiched between said first and second spaced optically transparent elements and in intimate contact therewith, said interlayer having an area less than said first and second spaced optically transparent elements, said optically transparent interlayer having a refractive index substantially equal to a refractive index of said first and second spaced elements;

    an electrochromic medium confined in said space between said rear surface of said first element and said front surface of said second element and not occupied by said optically transparent interlayer;

    means for sealing said electrochromic medium within said space; and

    means for applying an electric field to said electrochromic medium to cause variation in the light transmittance of said medium.

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