Tension mask for color CRT, method for manufacturing the tension mask, and exposure mask used in the manufacture of the tension mask
US6762545B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 18, 2001 |
| Grant date | Jul 13, 2004 |
| Priority date | — |
| Expiry date | Apr 1, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J29/07
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A tension mask for a color cathode-ray tube, a method for manufacturing the tension mask, and an exposure mask for use in the manufacture of the tension mask are provided. The tension mask is manufactured by depositing photosensitive layers over the top and bottom surfaces of a steel foil. An upper exposure mask with a pattern including a series of parallel upper light transmission portions arranged in lines is aligned over the top surface of the steel foil, and a lower exposure mask with a pattern is aligned over the bottom surface of the steel foil. Here, the pattern of the lower exposure mask includes a series of parallel lower light transmission portions arranged in lines, a plurality of first light shielding portions intersecting adjacent lower light transmission portions among the series of the parallel lower light transmission portions, and a plurality of second light shielding portions partially extending between the edges of the adjacent lower light transmission portions. Following this, the photosensitive layers uncovered with the lower and upper exposure masks are exposed using an exposure light source, and then the upper and lower exposure masks are removed from the ste…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.