Method of manufacturing color picture tubes
US4284662A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 23, 1979 |
| Grant date | Aug 18, 1981 |
| Priority date | — |
| Expiry date | Jan 23, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J29/28
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In a method of manufacturing a color picture tube of the type comprising the steps of coating phosphors of three primary colors on the inner surface of the face plate of the color picture tube to form dots or stripes of the phosphors, applying an acrylic resin emulsion on the dots or stripes of the phosphors to form an acrylic resin film, vapor depositing metal onto the film to form a metallic reflecting film, subjecting the acrylic resin film to a pyrolysis for decomposing it into gases, and removing the gases, the acrylic resin emulsion comprises a plurality of emulsions respectively containing conventional acrylic resin and normal butyl methacrylate resin. The normal butyl methacrylate resin is mixed with the conventional acrylic resin at a ratio of 5 to 40% by weight. According to this method, it is possible to prevent bulging of the metallic reflecting film during baking step while minimizing the number of the pin holes and cracks of the metallic reflecting film so as not to decrease the brightness of the reproduced picture.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.