Method of making color picture tubes having a mix of electron guns
US5944571A · kind A · utility
2Cited by
4References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 7, 1997 |
| Grant date | Aug 31, 1999 |
| Priority date | — |
| Expiry date | Aug 7, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J9/244
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The present invention provides an improvement in a method of making a plurality of color picture tubes of approximately the same size and including a mix of at least two different types of electron guns therein. The electron guns include each a plurality of electrodes, with each electrode having openings for the passage of three electron beams. The improvement comprises selecting materials for each electrode of the at least two different types of electron guns that will produce a minimum difference in the focus voltage sensitivities between the two different types of electron guns.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.