Electrostatic and dynamic magnetic control of cathode ray for distortion compensation
US3946266A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 17, 1975 |
| Grant date | Mar 23, 1976 |
| Priority date | — |
| Expiry date | Jun 17, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J29/51
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A cathode ray tube is disclosed in which an electron beam is deflected to scan a phosphor screen for producing a picture thereon, and which has an electrostatic beam control device for deforming the cross section of the beam so as to compensate for the distortion in shape of the beam landing spot on the screen at its peripheral portion caused by the beam deflection and a magnetic beam control device for deforming the cross-section of the beam dynamically in response to the beam deflection so as to compensate for the distortion in shape of the beam landing spot on the screen at its central portion caused by the electrostatic beam control device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.