Electro-optic mirror element and process of making same

  • US 9,897,889 B2
  • Filed: 09/23/2016
  • Issued: 02/20/2018
  • Est. Priority Date: 11/18/2013
  • Status: Active Grant
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First Claim
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1. A process for filling a variable reflectance vehicular electro-optic rearview mirror reflective element assembly, said filling process comprising:

  • providing an unfilled mirror cell comprising a front substrate and a rear substrate joined by a perimeter seal, wherein said perimeter seal spaces said front and rear substrates apart and forms an interpane cavity therebetween, and wherein said perimeter seal has a gap between terminal ends of said perimeter seal to provide a fill port for said unfilled mirror cell when said front and rear substrates are joined together;

    providing a filling element, wherein said filling element comprises (i) a fluid reservoir, (ii) a mirror cell receiving portion and (iii) a channel that provides fluid communication between said fluid reservoir and said mirror element receiving portion;

    providing a compressible sealing element having a passageway therethrough;

    positioning said unfilled mirror cell in a vacuum chamber with said fill port disposed at an upper portion of said unfilled mirror cell;

    positioning said filling element and said compressible sealing element in the vacuum chamber such that said mirror cell receiving portion receives said upper portion of said unfilled mirror cell, with said fluid reservoir disposed above said mirror cell receiving portion, and with said compressible sealing element between said filling element and said unfilled mirror cell, wherein said filling element substantially seals at said unfilled mirror cell around said fill port via said compressible sealing element;

    establishing negative pressure in the vacuum chamber to place said unfilled mirror cell under negative pressure with no pressure differential between said interpane cavity and the negative pressure of the vacuum chamber;

    providing electro-optic fluid at said fluid reservoir of said filling element, said electro-optic fluid flowing through said channel of said filling element and through said passageway of said compressible sealing element and through said fill port of said unfilled mirror cell to fill said interpane cavity with said electro-optic fluid; and

    after said interpane cavity is filled with said electro-optic fluid and while the filled mirror cell is still in the vacuum chamber and under negative pressure, removing said filling element and said compressible sealing element from the filled mirror cell and plugging said fill port.

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