Color cathode ray tube having an intermediate layer between a face plate and a tricolor phosphor layer
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorYasuo Iwasaki
Life of this patent
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Abstract
A color cathode ray tube includes an intermediate layer between the face plate and the tricolor phosphor layer. The intermediate layer is a selective light absorption layer or a neutral filter layer. The selective light absorbing function and the uniform light absorbing function are imparted, not to the functional film on the outer surface of the face plate, but to the intermediate layer formed on the surface of the face plate facing the electron gun, namely, on the inner surface of the face plate. The mechanical strength of the functional film is thus enhanced.
Claims24
A color cathode ray tube comprising:
- a face plate including an inner surface onto which electron beams are projected;
- a transparent functional film formed on an outer surface of the face plate;
- a tricolor phosphor layer, provided on the inner surface side of the face plate including red, green and blue phosphors which emit light when the electron beams are impinged thereon;
- and
- an intermediate layer, having predetermined optical characteristics, provided between the inner surface of the face plate and the tricolor phosphor layer, wherein the intermediate layer is a selective light absorption layer having a light absorption characteristic common to the red, green and blue phosphors.
A color cathode ray tube comprising:
- a face plate including an inner surface onto which electron beams are projected;
- a transparent functional film formed on an outer surface of the face plate;
- a tricolor phosphor layer, provided on the inner surface side of the face plate including red, green and blue phosphors which emit light when the electron beams are impinged thereon;
- and
- an intermediate layer, having predetermined optical characteristics, provided between the inner surface of the face plate and the tricolor phosphor layer,
- wherein the intermediate layer is a neutral filter layer having a uniform transmittance with respect to the light emitted from the red, blue and green phosphors.
Dependencies are inferred from the claim text.