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Method of coating a transparent substrate

  • US 4,497,700 A
  • Filed: 03/22/1984
  • Issued: 02/05/1985
  • Est. Priority Date: 03/25/1983
  • Status: Expired due to Term
First Claim
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1. A method of coating a transparent substrate with a multilayer optical filter which comprises the steps of:

  • (a). applying a reflective silver coating to said substrate;

    (b). thereafter applying a protective coating to said silver coating of a metal oxide by magnetron cathode sputtering at an S protective coating rate and in an S protective coating partial pressure;

    (c). thereafter applying by magnetron cathode sputtering a dereflective metal oxide coating at an E dereflective coating-oxygen partial pressure and at an E dereflective coating rate; and

    (d). controlling the coating rates during the application of said protective and dereflective coating so that the S partial pressure is less than the E partial pressure and the S coating rate is less than the E coating rate.

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