Shadow mask for color CRT
US6432592B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 21, 2000 |
| Grant date | Aug 13, 2002 |
| Priority date | — |
| Expiry date | Apr 21, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J2229/0772
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A shadow mask for a color CRT includes an effective face having a plurality of electron beam through holes and having a predetermined curvature; and a skirt unit extendedly bent at an outer portion of the effective face at a predetermined angle in the axial direction of the CRT, so as to be combined to a frame, wherein the skirt unit of the shadow mask has a plurality of vertical beads in parallel to the axial direction of the CRT and at least one horizontal bead formed crosswise in the lengthwise direction almost perpendicular to the vertical bead. With this structure, the strength property of the skirt unit of the shadow mask is improved to thereby minimize the widening degree of the skirt occurring in mounting the mask. Also, the curvature deformation such as mask sinking is prevented, thereby improving the quality of the color CRT.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.