Shadow mask for cathode ray tubes
US7329980B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 14, 2005 |
| Grant date | Feb 12, 2008 |
| Priority date | — |
| Expiry date | Jan 24, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J2229/0755
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Disclosed herein is a shadow mask for cathode ray tubes. When the width of a smaller hole part of each of slots formed at the shadow mask is defined as Sw, the horizontal distance between the end of a taper-shaped larger hole part facing the panel side of each of the slots, which is adjacent to the edge part of the shadow mask, and the end of the smaller hole part, which is adjacent to the edge part of the shadow mask, is defined as Ta, and the incident angle at which the electron beam passes through each of the slots is defined as θ, the shadow mask has at least one slot through which the electron beam passes at an incident angle θ of above 47 degrees, and the at least one slot through which the electron beam passes at an incident angle θ of above 47 degrees is configured such that the following inequality is satisfied: 1<Ta/Sw<2.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.