High-definition cathode-ray tube and manufacturing method thereof
US6020681A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 23, 1997 |
| Grant date | Feb 1, 2000 |
| Priority date | — |
| Expiry date | May 23, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J9/2273
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A color cathode-ray tube, and a method for manufacturing this color cathode-ray tube capable of reducing light/dark line patterns produced while the color cathode-ray tube is operated. Exposing light which has passed through a correction lens made of a continuous lens and a discontinuous lens is irradiated onto a photosensitive film of an inner surface of a face panel of the color cathode-ray tube via a shadow mask so as to expose this photosensitive film, and then while using the exposed photosensitive film as a mask, fluorescent dot patterns are formed on a surface of the face panel. The correction lens having a discontinuous plane owns a plurality of light incident planes, a light projection plane for projecting the light entered into the light incident planes outside this light projection plane, and a plurality of level difference planes arranged between the light incident planes located adjacent to each other. The plural light incident planes are arranged in a matrix form, and enters therein light emitted from an exposing light source, and also refracts the entered light along a desirable direction. Then, the plural level difference planes are provided in such a manner that tw…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.