Mirror coating

  • US 5,528,422 A
  • Filed: 12/07/1993
  • Issued: 06/18/1996
  • Est. Priority Date: 12/07/1993
  • Status: Expired due to Term
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First Claim
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1. A mirror coating comprising a recurring succession of two materials which have individually variable thicknesses, and which form a layered interference filter structure, and wherein the mirror coating exhibits substantially neutral reflected chromaticity as observed with reflected visible light, has a peak transmittance of not less than 60% within a predetermined spectral band pass region, has a peak absorbance of not less than 30% within a spectral region other than the predetermined spectral band pass region, and which simultaneously has a luminous reflectance greater than 50% for the visible light striking the mirror coating, and wherein the recurring succession of materials comprises:

  • a first layer of ferric oxide having a thickness dimension of about 145.30 nanometers;

    a second layer of silicon dioxide having a thickness dimension of about 72.89 nanometers;

    a third layer of ferric oxide having a thickness dimension of about 54.14 nanometers;

    a fourth layer of silicon dioxide having a thickness dimension of about 43.74 nanometers;

    a fifth layer of ferric oxide having a thickness dimension of about 26.0 nanometers;

    a sixth layer of silicon dioxide having a thickness dimension of about 133.60 nanometers; and

    a seventh layer of ferric oxide having a thickness dimension of about 85.79 nanometers.

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