Cathode ray tube having apertured shadow mask
US6566795B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 2, 2001 |
| Grant date | May 20, 2003 |
| Priority date | — |
| Expiry date | Jun 24, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J2229/0755
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A cathode ray tube capable of reducing the doming amount and suppressing the occurrence of moire stripes at the same time, which also can prevent the so-called persimmon stone phenomenon from occurring, is provided. In the apertures, the protruding portions that are protruding from end faces in the horizontal direction of the apertures to the inside of the apertures are formed. The protruding portion in the aperture located on the right side of the phosphor surface from the vertical center line of the shadow mask is protruding in the direction toward the peripheral portion on the right side, while the protruding portion in the aperture located on the left side of the phosphor surface is protruding toward the peripheral portion on the left side. Accordingly, the doming amount can be reduced and the occurrence of moire stripes can be suppressed at the same time, while the persimmon stone phenomenon in which the beam spot of an electron beam on the phosphor surface is cut partially can be prevented from occurring.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.