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Thermostable back-surface mirrors

  • US 6,416,194 B1
  • Filed: 02/11/1999
  • Issued: 07/09/2002
  • Est. Priority Date: 02/11/1999
  • Status: Expired due to Fees
First Claim
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1. A thermostable back-surface mirror comprising, in combination:

  • an optically transparent glass substrate; and

    a mirror coating thermostable at temperatures greater than 400°

    C. on a surface of the glass substrate, said mirror coating having a reflective surface visible through the glass substrate and comprising;

    a reflectivity enhancing layer formed of silver or copper;

    an outer, reflective chromium-based layer overlying the reflectivity enhancing layer; and

    a second chromium-based layer formed of Cr or Ni—

    Cr alloy between the reflectivity enhancing layer and the glass substrate, wherein the outer chromium-based layer is substantially thicker than the second chromium-based layer.

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