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Surface acoustic wave touchscreen sealing system

  • US 5,332,238 A
  • Filed: 01/04/1993
  • Issued: 07/26/1994
  • Est. Priority Date: 07/30/1991
  • Status: Expired due to Term
First Claim
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1. A sealing system for forming a liquid impermeable seal and barrier between the surface of a surface acoustic wave touchscreen and a housing comprising:

  • at least one elongated body of resiliently compressible self-supporting foam material having an open cell surface disposed on the surface of the surface acoustic wave touchscreen, said open cell surface being substantially transmissive to surface acoustic wave energy, said body having at least one liquid impermeable membrane surface portion, said membrane surface portion forming a liquid impermeable barrier extending between said surface acoustic wave touchscreen surface and said housing;

    means for maintaining said body in position between said surface acoustic wave touchscreen and said housing so that said membrane surface portion contacts the surface acoustic wave touchscreen surface and extends away from said surface acoustic wave touchscreen; and

    means for compressing said body between said surface acoustic wave touchscreen and said housing to form a liquid impermeable seal at the interface of said membrane surface portion and the surface of said surface acoustic wave touchscreen.

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