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Electrically-conductive, contrast-selectable, contrast-improving filter

  • US 5,521,765 A
  • Filed: 07/07/1994
  • Issued: 05/28/1996
  • Est. Priority Date: 07/07/1994
  • Status: Expired due to Term
First Claim
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1. A thin film contrast-improving filter, comprising:

  • a transparent substrate;

    a substantially transparent dielectric layer;

    a precoat layer;

    a metal layer consisting essentially of at least one metal selected from the group consisting of silver, gold, copper platinum, and alloys of these metals, said metal layer being substantially transmissive to visible light;

    a postcoat layer;

    a protective substantially transparent dielectric layer comprising silicon nitride; and

    a low-index, substantially-transparent, dielectric layer, the low-index layer having a lower index of refraction than the protective dielectric layer, wherein each of the postcoat and precoat layers has a thickness of 8 Å

    or more and is formed from a mixture of nickel metal and at least one of chromium and chromium nitride, the precoat and postcoat layers having a combined thickness of 24 Å

    or more.

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