Cathode ray tube having an overall length thereof shortened
US6329747A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 6, 2000 |
| Grant date | Dec 11, 2001 |
| Priority date | — |
| Expiry date | Jan 6, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J2229/4841
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The in-line type electron gun includes an electron beam generating section for generating and directing plural electron beams along toward a phosphor screen, and an electron beam focusing section for focusing the plural electron beams from the electron beam generating section onto the phosphor screen. The electron beam focusing section includes a focus electrode, at least one intermediate electrode and an anode supplied with a highest voltage arranged in the order named. The at least one intermediate electrode is supplied with an intermediate voltage between the highest voltage and a voltage supplied to the focus electrode. The following relationship is satisfied: 1.55.ltoreq.D/L.ltoreq.1.72, and 18.2 mm.ltoreq.d.ltoreq.26 mm,where D (mm) is a diagonal length of a usable display area of the phosphor screen, L (mm) is a distance from a center of the phosphor screen to an end of the anode facing toward the focus electrode, and d (mm) is an outside diameter of the neck portion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.