Electrochromic device for controlling transmittance of light

  • US 4,958,917 A
  • Filed: 01/23/1989
  • Issued: 09/25/1990
  • Est. Priority Date: 01/29/1988
  • Status: Expired due to Fees
First Claim
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1. An electrochromic device for controlling transmittance of light, comprising:

  • a transparent inner substrate with a transparent electrode layer coated on each side thereof;

    first and second electrochromic layers which are formed on the electrode layers on the two opposite sides of said inner substrate, respectively, and are formed of one of a first electrochromic material which takes on a characteristic color in its electrochemically oxidized state and a second electrochromic material which takes on a characteristic color in its electrochemically reduced state;

    a transparent first outer substrate which is coated with a transparent electrode layer and is arranged opposite to and spaced from said inner substrate such that the electrode layer of the outer substrate faces the first electrochromic layer, the outer substrate being dimensioned larger than said inner substrate;

    a transparent second outer substrate which is coated with a transparent electrode layer and is arranged opposite to and spaced from said inner substrate such that the electrode layer of the second outer substrate faces the second electrochromic layer, the second outer substrate being dimensioned larger than said inner substrate;

    third and fourth electrochromic layers which are formed on said electrode layer on said first outer substrate and said electrode layer on said second outer substrate, respectively, and are formed of the other of said first and second electrochromic materials;

    a first peripheral seal formed of a butyl rubber base adhesive composition disposed in the space between the inner substrate and each of the first and second outer substrates so as to hold the inner substrate and the first and second outer substrates in the opposite and spaced arrangement and airtightly define a first space between the inner substrate and the first outer substrate and a second space between the inner substrate and the second outer substrate and forming a peripheral gap between the first and second outer substrates, a peripheral region of the inner substrate protruding into said peripheral gap;

    an electrolyte liquid which fills up said first space and said second space;

    a first connector which is an angled strip of a sheet metal having two parallel leg portions and is fitted on said inner substrate such that said two parallel legs are respectively fixed to the transparent electrode layers on the two opposite sides of said inner substrate;

    a second connector which is an angled strip of a sheet metal having two parallel leg portions and is fitted into a marginal region of the space between said first and second outer substrates such that said two parallel leg portions are respectively fixed to the transparent electrode layer on said first outer substrate and the transparent electrode layer on said second outer substrate;

    a second seal formed of polysulfide rubber filling said peripheral gap such that said first connector and at least said leg portions of said second connector are embedded in the second seal;

    a first lead which extends outward from said first connector through said first and second seals; and

    a second lead which extends outward from said second connector.

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