Cathode-ray tube and semiconductor device for use in such a cathode-ray tube
US4574216A · kind A · utility
23Cited by
4References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 19, 1985 |
| Grant date | Mar 4, 1986 |
| Priority date | — |
| Expiry date | Mar 19, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J29/84
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A semiconductor cathode is provided with deflection electrodes, with which a dipole field can be generated. As a result of this, electrons released at the surface of the semiconductor cathode leave the surface at a certain angle. For use inter alia in camera tubes, display tubes, such an inclined beam can be aligned without any problems. Positive ions which are released inter alia from residual gases and are accelerated in the direction of the cathode impinge on the cathode at an acute angle. As a result of this, the active part of the cathode is substantially not attacked by said positive ions, so that degradation is prevented.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.