Microwave oven magnetron having choking structure and leakage flux compensation means
US5177403A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 30, 1990 |
| Grant date | Jan 5, 1993 |
| Priority date | — |
| Expiry date | Oct 30, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J23/54
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In a microwave oven magnetron, a first metal cylinder and a ring-like permanent magnet are provided on a magnetron body. Second and third metal cylinders are coaxially arranged in the first metal cylinder so that choking grooves for choking second and fourth harmonic waves are formed between the first and second metal cylinders and the second and third metal cylinders. A ferromagnetic cylinder made of iron or iron alloy is arranged around the first metal cylinder. Thus, a magnetic flux supplied from the permanent magnet into a space inside of the second metal cylinder have axial components which are greater than or equal to 400 gauss in over half the inner space.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.