Fine adjustment apparatus for electron beam deflection a cathode ray tube
US6552484B1 · kind B1 · utility
Assignees
Inventor
Key dates
| Filing date | Jun 26, 2000 |
| Grant date | Apr 22, 2003 |
| Priority date | — |
| Expiry date | Dec 11, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J29/701
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Apparatus for displaying video images including a vacuum envelope which includes a neck portion and a display screen and an electron gun system. The electron gun system producing at least one electron beam, which in response to a magnetic field converges the at least one electron beam onto the display screen causing video images corresponding to the at least one electron beam to be displayed thereon. The apparatus further including a deflection yoke system for producing the magnetic field, the deflection yoke system comprising a plurality of electrical coils arranged such that a first magnetic field is formed and a second magnetic field is formed transverse to said first magnetic field, the deflection yoke system further including at least one conducting plate which includes magnetic field shaping features such that when said at least one conducting plate is electrically energized, the magnetic field is enhanced and balanced to compensate for undesired barrel distortion, pin-cushion distortion, and misconvergence errors. Alternatively, the deflection yoke system includes only a plurality of conducting plates which include magnetic field shaping features such that when the plurality…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.