Claims
- 1. An impregnated cathode structure comprising:
- A sleeve having a truncated conically-shaped top receiver portion with an opening having a predetermined diameter at the center thereof and a bottom lower space;
- oxide cathode material formed within, and conforming to the shape of, said top receiver portion and having a conically-shaped portion of oxide cathode material conforming said conically-shaped top receiver portion and exposed through said opening;
- a coating layer of platenoid material covering the exposed conically-shaped portion and overlapping an area of said top receiver portion adjacent said opening;
- a backing plug which divides the inside of said sleeve to form said top receiver portion and said bottom lower space; and
- a heater installed in said bottom lower space below said backing plug for indirectly heating said cathode structure.
- 2. The cathode structure as claimed in claim 1, wherein said sleeve is formed of a welded cylindrical body and a truncated conical cap.
- 3. The cathode structure as claimed in claim 1, wherein the platinoid elements are selected from Os, Ir and Ru.
Priority Claims (1)
Number |
Date |
Country |
Kind |
91-9767 |
Jun 1991 |
KRX |
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Parent Case Info
This application is a File Wrapper Continuation Application of application Ser. No. 07/896,662, filed Jun. 10, 1992, now abandoned.
US Referenced Citations (6)
Foreign Referenced Citations (3)
Number |
Date |
Country |
0052835 |
May 1981 |
JPX |
0068527 |
Apr 1985 |
JPX |
0225328 |
Nov 1985 |
JPX |
Non-Patent Literature Citations (1)
Entry |
Dispenser Cathodes: The Current State of the Technology; L. R. Fulce, IEDM 83; pp. 448-451, Dec. 1983. |
Continuations (1)
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Number |
Date |
Country |
Parent |
896662 |
Jun 1992 |
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