Indirectly heated cathode assembly and its associated electron gun structure
US5027029A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 8, 1989 |
| Grant date | Jun 25, 1991 |
| Priority date | — |
| Expiry date | Dec 8, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J1/20
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An indirectly heated type cathode assembly comprises a cathode sleeve having a heater within itself and having an emitter-impregnated type cathode disc fitted at one end, a plurality of straps connected at one end to a lower end portion of the cathode sleeve, and a cylinder holder whose upper end is connected to the other end of each strap, the holder being located outside the cathode sleeve such that it is spaced a predetermined distance apart from the cathode sleeve. A heat reflecting cylinder is located between the cathode sleeve and the holder of the indirectly heated type cathode assembly such that it is coaxial with the cathode sleeve and holder. The heat reflecting cylinder is supported by the holder and each strap extends such that it is not in contact with the heat reflecting cylinder. The strap is made of a Ta-W alloy or a Ta-W-Hf alloy. An electron gun structure comprises the indirectly heated type cathode assembly, a first grid placed in front of the indirectly heated type cathode assembly and an insulation support into which the first grid and the holder of the indirectly heated type cathode assembly are embedded partially and directly through a securing piece, respect…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.