Claims
- 1. A photocathode assembly comprising:
- a substrate consisting essentially a polycrystalline alkaline metal halide;
- a photocathode formed on said substrate and mainly consisting of a semimetal and at least one element selected from alkaline metals; and
- an alkaline metal oxide layer being interposed between said photocathode and said substrate.
- 2. A photocathode assembly according to claim 1, wherein a composition ratio of the semimetal and the at least one element selected from alkaline metals is stoichiometric or mostly stoichiometric.
- 3. A photocathode according to claim 11, wherein a surface region of said photocathode which faces a fluorescent screen contains a larger number of atoms of other alkaline metals than of cesium.
- 4. A photocathode assembly according to claim 2, wherein said semimetal is antimony, and a composition ratio of antimony and the alkaline metals other than cesium is 1 : 0.1 to 1 : 10.
- 5. A photocathode assembly according to claim 2, wherein said semimetal is antimony and the alkaline metals are cesium and elements other than cesium, and a composition ratio of antimony to the alkaline metals other than cesium is 1:0.1 to 1:10.
- 6. A photocathode assembly according to claim 2, wherein said photocathode contains oxygen.
- 7. A photocathode assembly according to claim 6, wherein oxygen is bonded to the semimetal, manganese, or silver.
- 8. A method of forming a photocathode, comprising the steps of:
- forming an alkaline metal oxide layer on a substrate consisting essentially of a polycrystalline alkali metal halide and
- forming, on said alkaline metal oxide layer, a photocathode mainly consisting of a semimetal and one or a plurality of alkaline metals, wherein a composition ratio of the semimetal and the one or a plurality of types of alkaline metals is stoichiometric or mostly stoichiometric.
- 9. A method according to claim 8, wherein said forming an alkaline metal oxide layer is performed by oxidizing an alkaline metal deposited on said substrate.
- 10. A method according to claim 9, wherein said depositing an alkaline metal and oxidizing an alkaline metal are alternately repeated.
- 11. A photocathode assembly according to claim 2, wherein said at least one alkaline metals includes cesium.
- 12. A photocathode assembly according to claim 1, wherein a porous or polycrystalline intermediate layer is provided between said substrate and said alkaline metal oxide layer.
Priority Claims (1)
Number |
Date |
Country |
Kind |
62-61070 |
Mar 1987 |
JPX |
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Parent Case Info
This is a continuation of application No. 07/169,477, filed Mar. 17, 1988 3/17/88, which was abandoned upon the filing hereof.
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Continuations (1)
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Number |
Date |
Country |
Parent |
169477 |
Mar 1988 |
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