Cathode-ray tube apparatus
US6646370B2 · kind B2 · utility
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1References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 26, 2001 |
| Grant date | Nov 11, 2003 |
| Priority date | — |
| Expiry date | Jan 23, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J2229/582
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electron gun assembly in a cathode-ray tube apparatus includes a quadrupole lens that is created in accordance with deflection of electron beams. The quadrupole lens is created by two mutually opposing grids. The two grids have non-circular electron beam passage holes in their mutually facing surfaces. Each electron beam passage hole has a waist portion which minimizes a horizontal or vertical dimension of a region for passing the associated electron beam.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.