Color cathode ray tube and method for manufacturing the same display screen for color
US5844355A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 19, 1996 |
| Grant date | Dec 1, 1998 |
| Priority date | — |
| Expiry date | Jul 19, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J29/322
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A color cathode-ray tube having a good quality of display screen in which a fluorescent dot pattern is formed to have good configuration and positional accuracies. A method for manufacturing the display screen for the cathode-ray tube wherein a correction lens is formed with a plurality of fine adjacent planar or curved faces to cause uniform generation of a line width of latticed light/dark lines and a contrast thereof generated by level differences between the adjacent planar or curved faces when subjected to irradiation of exposure light all over a light exposure surface, the exposure light passed through the correction lens during vibration of the correction lens is directed through a shadow mask on a fluorescent film of an inner surface of a face panel of the cathode-ray tube for uniform irradiation thereof of the fluorescent film, the fluorescent dot pattern is formed on the inner surface of the face panel with the light-exposed fluorescent film used as a mask, whereby the fluorescent dot pattern having good configuration and positional accuracies is formed on the inner surface of the face panel, the display screen is formed with the fluorescent dot pattern having pixels of 1…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.