Color cathode ray tube having smooth screen edges
US4631440A · kind A · utility
3Cited by
4References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 29, 1985 |
| Grant date | Dec 23, 1986 |
| Priority date | — |
| Expiry date | Apr 29, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J29/076
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In a color cathode ray tube having a vertically striped screen and a vertically slotted aperture mask, the top and bottom screen edges are made smooth by varying the vertical pitch between mask apertures while keeping the number of apertures per vertical column constant, so that every other column terminates in a full length slot.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.