Flat configuration cathode ray tube
US4973889A · kind A · utility
5Cited by
1References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 31, 1990 |
| Grant date | Nov 27, 1990 |
| Priority date | — |
| Expiry date | Jan 31, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J31/126
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A flat configuration CRT having positioned behind one or more line cathodes an array of control electrodes for electron beam modulation and shield electrodes for mutually shielding the control electrodes, in which the shield electrodes are connected as a plurality of electrically separate blocks. DC voltages applied to the respective blocks are adjusted such as to establish identical levels of beam current for electron beams which are generated by emission from the line cathodes, thereby enabling accuracy requirements for spacing between these electrodes and the line cathodes to be substantially reduced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.