Shadow mask having ribs bounding rectangular apertures
US3944867A · kind A · utility
18Cited by
7References
2Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 15, 1974 |
| Grant date | Mar 16, 1976 |
| Priority date | — |
| Expiry date | Mar 15, 1994 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J29/07
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A shadow mask for use in a color cathode ray tube to insure that a given electron beam impinges only on a given portion of the cathode ray tube screen. The mask comprises a webbing or sheet of relatively thin, electrically conductive material which defines a mask plane and which has therein a periodic array of electron transmissive apertures. The sheet includes a periodic array of ribs and/or dimples extending out of the plane of the mask to impart substantial rigidity to the mask.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.