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WATCH COVER GLASS

  • US 20100196685A1
  • Filed: 09/25/2008
  • Published: 08/05/2010
  • Est. Priority Date: 09/26/2007
  • Status: Active Grant
First Claim
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1. A watch cover glass comprising a transparent substrate having a front surface and a back surface and, provided on at least one surface of the substrate, an antireflection film obtainable by laminating a SiO2 and Si3N4 mixed film and a Si3N4 film alternately one after another in the total of 4 layers or 5 or more layers and having the SiO2 and Si3N4 mixed film in the outermost layer.

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