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Electrochromic indicator device assembled with an adhesion promoting layer

  • US 4,558,924 A
  • Filed: 03/22/1983
  • Issued: 12/17/1985
  • Est. Priority Date: 03/30/1982
  • Status: Expired due to Fees
First Claim
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1. Electrochromic indicating device comprising:

  • first and second electrodes facing each other across a cavity filled with an electrolyte, said first electrode being composed of an oxide of a transition metal and supported by a surface of a transparent or translucent substrate wherein a conducting layer is interposed between said first electrode and said substrate for supply of current to said first electrode and a protection layer is provided on said conducting layer, surrounding said first electrode and on a region not covered by said first electrode, said second electrode being a counter electrode provided as a layer on a second substrate which is a metallic substrate, said substrates being joined together around said electrolyte-filled cavity by an adhesive bonding material applied in a region between said protection layer and said metallic substrate, said device further comprising;

    an adhesion-promoting layer (14,

         17) consisting essentially of at least one substance selected from a group which consists of polyvinyl alcohol and polyvinyl butyral and applied on at least a surface of the metallic substrate in the region where the substrates are to be bonded with each other, said adhesion promoting layer being interposed at least between the metallic substrate upon which it is applied and a film of the adhesive bonding material (18) applied between the substrates for bonding them together.

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