Elemental semiconductor mirror

  • US 6,196,688 B1
  • Filed: 03/23/2000
  • Issued: 03/06/2001
  • Est. Priority Date: 05/15/1991
  • Status: Expired due to Fees
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First Claim
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1. A high luminous reflectance mirrored substrate comprising:

  • a glass substrate having first and second surfaces;

    a reflector coated upon said first surface of said glass substrate, said first surface adapted to face a source of light to be reflected;

    said reflector comprising a multilayer thin film stack comprising a first thin film layer of an elemental semiconductor which is closest to said first surface of said glass substrate and has a refractive index of greater than 3.0, a second thin film layer which is farthest from said first surface of said glass substrate, and a third thin film layer disposed between said first thin film layer and said second thin film layer, said third thin film layer having a refractive index between about 1.3 and 2.7, said second thin film layer having a refractive index greater than said third thin film layer;

    said reflector having a light reflectance of at least about 60% of light incident thereon at the wavelength region of about 550 nanometers and being achromatic; and

    a light absorbing coating on at least one of a surface of said glass substrate and a layer of said reflector, said light absorbing coating absorbing light transmitted by said reflector coated substrate.

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