Color cathode-ray tube
US6465945B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 14, 2000 |
| Grant date | Oct 15, 2002 |
| Priority date | — |
| Expiry date | Apr 4, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J2229/8616
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The outer surface of a panel effective section of a vacuum envelope is substantially flattened. A phosphor screen is formed on the inner surface of the effective section and includes stripe-shaped phosphor layers and light absorption layers arranged in parallel. The panel effective section is formed such that a corner portion is 8 mm to 15 mm thicker than the central portion and the transmittance of the central portion is set at 40% to 60%. The phosphor screen is formed such that the ratio of the width of a light absorption layer to the pitch of phosphor layers in the central portion of the panel effective section is larger than or equal to that in the peripheral portion thereof. A shadow mask is opposed to the phosphor screen and has a mask body in which a number of electron beam passage apertures are formed. The pitch of apertures formed in the peripheral portion of the mask body is 1.3 to 1.4 times as large as that of apertures formed in the central portion thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.