Zinc sulfide ceramic material and cathode ray tubes using the same
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsYosuke Fujita, Fumio Fukushima, Yoji Fukuda, Tsuneharu Nitta
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Abstract
Highly densed zinc sulfide ceramic materials, which essentially comprise zinc sulfide and alkali metals and/or alkaline earth metals and impurities acting as luminescent center, and which show a high brightness of cathode luminescence under irradiation of electron beam having a low energy, are easily made in the form of the sintered material, by heating the mixture of the said materials in inert or sulfuring atmosphere.
Claims15
Particles of zinc sulfide sintered ceramic material adapted for use as the luminescent screen in a cathode ray tube consisting essentially of zinc sulfide and at least one element selected from the group consisting of Ca, Sr and Ba.
Particles of zinc sulfide sintered ceramic material adapted for use as the luminescent screen in a cathode ray tube, said material consisting essentially of zinc sulfide;
- at least one element selected from the group consisting of Ca, Sr and Ba;
- at least one activator selected from the group consisting of Au, Ag, Cu, Mn and Tb;
- and
- at least one co-activator selected from the group consisting of Al, Ga, In, Cl, Br and I.
A cathode ray tube including as the luminescent screen a layer of particles of a zinc sulfide sintered ceramic material which consists essentially of zinc sulfide and at least one element selected from the group consisting of Ca, Sr and Ba.
A cathode ray tube including as the luminescent screen therein a layer of particles of a zinc sulfide sintered ceramic material which consists essentially of:
- zinc sulfide;
- at least one element selected from the group consisting of Ca, Sr and Ba;
- at least one activator selected from the group consisting of Au, Ag, Cu, Mn and Tb;
- and
- at least one co-activator selected from the group consisting of Al, Ga, In, Cl, Br and I.
A luminescent screen adapted for use in a cathode ray tube, said screen comprising:
- a smooth, thin film of a dense, homogeneous zinc sulfide sintered ceramic material consisting essentially of:
- zinc sulfide;
- Ca, Sr, Ba or mixtures thereof present in an amount of from 0.02 to 3.0 percent of the zinc metal;
- Au, Ag, Cu, Mn, Tb or mixtures thereof as an activator;
- Al, Ga, In, Cl, Br, I or mixtures thereof as co-activator;
- and
- an aluminum conductive/reflection film of less than 1,000 Angstroms in thickness deposited on said film of ceramic material.
Dependencies are inferred from the claim text.