Space-saving cathode ray tube employing a six-pole neck coil
US6465944B1 · kind B1 · utility
1Cited by
12References
2Claims
0Family size
Assignees
Inventor
Key dates
| Filing date | May 4, 2001 |
| Grant date | Oct 15, 2002 |
| Priority date | — |
| Expiry date | May 4, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J2229/703
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In a cathode ray tube, an electron beam is directed towards a faceplate having an electrode biased at screen potential and is magnetically scanned across the faceplate to impinge upon phosphors thereon to produce light depicting an image. A six-pole coil is disposed proximate the deflection yoke and/or on the tube neck to modify the focus of the red, green and blue electron beams to control focus. An electrode between the tube neck and the faceplate is biased at or above screen potential to deflect electrons over a greater total angle than is obtained from the magnetic deflection.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.