CRT with means for monitoring electron beam
US4827183A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 2, 1988 |
| Grant date | May 2, 1989 |
| Priority date | — |
| Expiry date | Feb 2, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/24
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A cathode ray tube useful as a transducer for converting electrical signal information into a visual pattern on a recording medium uses a cylindrical envelope along which a signal modulated beam is projected. A fiber optics plate is positioned along the sidewall of the envelope and the beam is swept in a liner scan of the fiber optics plate by an array of electromagnets, positioned along the envelope and properly excited to deflect the beam appropriately. For monitoring the properties of the electron beam, the inner surface of the end plate of the envelope is provided with a patterned coating of luminescent material on which the electron beam is incident when undeflected by the array of electromagnets. Sensors are provided for measuring the flux distribution for monitoring the properties of the electron beam.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.