Shadow mask assembly for color cathode ray tube
US4996458A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 14, 1989 |
| Grant date | Feb 26, 1991 |
| Priority date | — |
| Expiry date | Jun 14, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J29/076
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A laminated shadow mask assembly for use in a color picture tube including an evacuated envelope having a longitudinal axis and also having a phosphor deposited screen lying generally perpendicular to the longitudinal axis, which assembly comprises a finely perforated, laminated shadow mask having a plurality of apertures defined therein in a predetermined pattern; a support frame for the support of the laminated shadow mask; and expansion compensating couplings disposed around the support frame for connecting the support frame in position within the evacuated envelope with the laminated shadow mask held generally parallel to the phosphor deposited screen. The finely perforated, laminated shadow mask comprises at least two perforated metal sheets each having a perforated area having minute holes defined therein and also having a non-perforated area, which minute holes in both of the perforated metal sheets form the apertures in the finely perforated, laminated shadow mask when the perforated metal sheets are connected together by means of a plurality of weld deposits formed within the perforated areas thereof to connect the perforated metal sheets firmly together.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.