Color cathode ray tube apparatus
US7312565B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 18, 2006 |
| Grant date | Dec 25, 2007 |
| Priority date | — |
| Expiry date | Sep 18, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J29/70
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In the vicinity of an end on the side of a large diameter portion of a deflection device, a pair of first permanent magnets for converging three electron beams in an X-axis direction and a pair of second permanent magnets for diverging them in the X-axis direction are provided. Inclination coefficients KTBH and KEWH of the distribution curve near the Z axis on the X axis of the Y-axis direction magnetic flux density of the magnetic fields respectively formed by the pair of first permanent magnets and the pair of second permanent magnets satisfy KTBH/KEWH<10 in at least one location within a range of 3 to 13 mm on the side of the phosphor screen with respect to a reference line in the Z-axis direction. An inclination coefficient KH of the distribution curve near the Z axis on the X axis of the Y-axis direction magnetic flux density of a combination magnetic field formed by the pair of first permanent magnets and the pair of second permanent magnets and an inclination coefficient KV of the distribution curve near the Z axis on the Y axis of the X-axis direction magnetic flux density of the combination magnetic field are both larger than 1.5 (Gauss/cm) in at least one location within …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.