Color cathode ray tube
AssigneeKabushiki Kaisha Toshiba
InventorsNorio Koike, Hidemi Matsuda, Kiyoshi Tokita, Kaneharu Kida
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Abstract
The shadow mask of a color cathode ray tube is arranged in the vicinity of a phosphor screen. The shadow mask is provided with through-holes that select the electron beams emitted from the electron guns. A layer comprising, as a filler, one or other of a metal, metal oxide, metal carbide, metal nutride, or a mixture of two or more of these, for example zirconium powder and, as a binder, one of an amorphous metal oxide compound, amorphous metal hydroxide compound or a mixture of these, for example silicon oxide, is formed on the surface of the shadow mask. This layer increases thermal radiation of the shadow mask, reduces electron scattering, and raises the residual emissivity.
Claims7
A color cathode ray tube comprising:
- a phosphor screen;
- a shadow mask with a large number of apertures, arranged in the vicinity of said phosphor screen;
- an electron gun generating an electron beam passing through said apertures of said shadow mask to excite said phosphor screen;
- wherein said shadow mask is coated with a layer consisting essentially of a binder selected from the group consisting of amorphous metal oxide, amorphous metal hydroxide and mixture thereof;
- and
- a filler selected from the group consisting of metal, metal oxide, metal carbide, metal nitride and mixture thereof.
Dependencies are inferred from the claim text.