Ferrite core, deflection yoke, and color picture tube apparatus
US7157998B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 4, 2005 |
| Grant date | Jan 2, 2007 |
| Priority date | — |
| Expiry date | Aug 19, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J2229/7031
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A ferrite core constituting a deflection yoke has a plurality of ridge-shaped convex portions on an inner circumferential surface. In a cross-section orthogonal to a center axis, the cross-sectional shape of an outer circumferential surface of the ferrite core is substantially circular, and the cross-sectional shape of an inner circumferential surface of the ferrite core excluding the convex portions is substantially circular in the vicinity of an end on a large diameter side of the ferrite core and is substantially rectangular in a portion between the vicinity of an end on a small diameter side and the vicinity of the end on the large diameter side. This can provide a low-cost color picture tube apparatus with a reduced deflection power and satisfactory productivity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.