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Projection cathode ray tube

  • US 5,126,626 A
  • Filed: 10/28/1991
  • Issued: 06/30/1992
  • Est. Priority Date: 03/29/1990
  • Status: Expired due to Fees
First Claim
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1. A method of reducing a Browning phenomenon in a projection cathode ray tube comprising the steps of:

  • (a) providing a fluorescent surface composed of a phosphor layer on an inner surface of a face panel of the projection cathode ray tube;

    (b) providing a multilayered optical interference film, composed of a plurality of optical thin film layers of alternately superimposed high refractive and low refractive index materials, between the fluorescent surface and the face panel; and

    (c) coating a transparent film of an inorganic material on an outermost surface of the multilayer optical interference film closest to the phosphor layer, to a thickness of at least 1.0 μ

    m to thereby prevent the Browning phenomenon of deterioration of optical characteristics of the multilayer optical interference film, caused over time by bombardment of electron beams while the projection cathode ray tube is active.

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