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Transparent touch panel

  • US 5,955,198 A
  • Filed: 08/28/1997
  • Issued: 09/21/1999
  • Est. Priority Date: 07/04/1994
  • Status: Expired due to Term
First Claim
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1. A transparent touch panel comprising:

  • (a) a base plate having a first transparent electro conductive layer on one of the surfaces thereof;

    (b) a top plate having a second transparent electro conductive layer on one of the surfaces thereof, wherein said base plate and said top plate are combined so that said first transparent electro conductive layer and said second transparent electro conductive layer face each other securing a certain specified clearance; and

    (c) a plurality of dot spacers located in between said base plate and said top plate, said dot spacers made of a composite resin including a flexible modified epoxy resin,wherein a pressure given from the other surface of said top plate makes said second transparent electro conductive layer placed on said top plate touch said first transparent electro conductive layer placed on said base plate to indicate a place where said pressure is given,wherein each of said plurality of dot spacers is installed at a certain interval and with a predetermined height in order to insure a clearance between said base plate and said top plate,wherein said modified epoxy resin is a resin created through a chemical reaction between a curing agent and at least one modified epoxy compound selected from the group consisting of rubber-modified epoxy compound, polyether-modified epoxy compound, fatty-acid-modified epoxy compound, polythiol-modified epoxy compound, and silicone-resin-modified epoxy compound,wherein a hardness of said dot spacers is not more than 95 in accordance with the test method specified in JIS-K6301-A; and

    wherein said rubber-modified epoxy compound is modified epoxy compound modified with at least one selected from the group consisting of urethane rubber, polybutadiene rubber, polyisoprene rubber and polyether rubber.

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