Method for manufacturing color cathode ray tube and manufacturing apparatus therefor
US6106353A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 24, 1999 |
| Grant date | Aug 22, 2000 |
| Priority date | — |
| Expiry date | Aug 24, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J2229/0716
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method for manufacturing a color cathode ray tube capable of surely applying a predetermined tension force to a shadow mask and preventing the generation of wrinkles and a manufacturing apparatus of the color cathode ray tube. The method includes applying a compression force to a mask frame formed in a frame shape in the direction in which a gap between at least a pair of facing sides is reduced; and welding and fixing a shadow mask to the upper surface of the mask frame with a tension force applied in the direction opposite to the compression force. In this method, a place to which the compression force is applied is the upper end of the external surface of the mask frame. Thus, a repulsion force in the direction in which a shadow mask is stretched can surely be obtained after the compression force is released, as compared with the case where the same level of compression force is applied to the lower end. Consequently, it is possible to prevent the deterioration of the tension force of the shadow mask.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.