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Electrically-heated window sheet material

  • US 10,237,922 B2
  • Filed: 07/16/2015
  • Issued: 03/19/2019
  • Est. Priority Date: 01/21/2013
  • Status: Active Grant
First Claim
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1. An electrically-heated window sheet material, comprising:

  • a heatable transparent conductive film having an upper side and a lower side; and

    a plurality of bus bars positioned to supply electricity to the transparent conductive film and comprising an upper bus bar and a lower bus such that the upper bus bar is connected to the upper side of the transparent conductive film and the lower bus bar is connected to the lower side of the transparent conductive film,wherein the transparent conductive film has a first region formed in a band shape extending between the upper and lower bus bars such that the upper side of the transparent conductive film has a recess portion formed in the first region and recessed toward the lower side of the transparent conductive film and that the transparent conductive film has a plurality of openings formed in the first region and positioned in a portion of the first region within 400 mm from the lower side of the transparent conductive film along the lower side of the transparent conductive film to face the recess portion and to generate a current flow bypassing the openings between the upper and lower bus bars, the transparent conductive film has a second region formed in a band shape extending between the upper and lower bus bars and a third region formed in a band shape extending between the upper and lower bus bars such that the first region is interposed between the second and third regions, and the transparent conductive film includes a frequency selective surface in the first region such that the frequency selective surface transmits a vertically polarized electromagnetic wave of a predetermined frequency through the plurality of openings.

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