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Microwave chemical vapor deposition apparatus and feedback control method

  • US 5,069,928 A
  • Filed: 01/27/1989
  • Issued: 12/03/1991
  • Est. Priority Date: 02/01/1988
  • Status: Expired due to Term
First Claim
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1. A microwave plasma CVD apparatus comprising:

  • (a) a hermetically sealed vacuum vessel;

    (b) raw material gas introducing means for introducing a raw material gas into the vacuum vessel;

    (c) evacuating means for evacuating said vacuum vessel; and

    (d) microwave introducing means for introducing microwaves through a microwave transmission circuit into said vacuum vessel to generate a plasma within the vacuum vessel;

    said microwave transmission circuit including a cavity resonator integrally provided with two matching circuits;

    said matching circuits comprising a plunger for varying the length of said cavity resonator and a pair of sliding matching irises.

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