Mask-frame combination for a color picture tube
US5359259A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 12, 1992 |
| Grant date | Oct 25, 1994 |
| Priority date | — |
| Expiry date | Jun 12, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J2229/0766
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A mask-frame combination for a color picture tube includes a metal mask (12) placed over the frame with a skirting that overhangs the frame with an overhang height (H) and that is bent back toward the frame, and includes spot welds (15.1-15.12) located around the mask skirting for attaching the mask to the frame, wherein the mask skirting (13) bears against the outside of the frame (11) for attaching the mask where it is bent back, wherein the spot welds are arranged on each side of the long sides in such a manner that in each long side there is a central spot weld situated close to the mid-point of the long side and an outer spot weld on each side of the central spot weld and separated from the central spot weld by a distance of between D/14 and D/9, where D equals the length of the diagonal of the frame, and wherein the mask skirting is provided on each long side with openings (17) on two sides of each outer spot weld and adjacent thereto.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.