Color CRT device with deflection yoke
US5801480A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Feb 12, 1997 |
| Grant date | Sep 1, 1998 |
| Priority date | — |
| Expiry date | Feb 12, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J29/76
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A color CRT device having a cathode ray tube and a deflection coil. The cathode ray tube includes a panel provided with a phosphor surface which has a diagonal diameter of 45 cm or more and has an aspect ratio greater than 4/3 and an electron gun having a high-voltage electrode and a focusing electrode which is disposed in proximity to the high-voltage electrode across a gap. The deflection yoke includes a core which cross-section perpendicular to a tube axis of the cathode ray tube is approximately annular; a saddle type first deflection coil for deflecting in a horizontal direction an electron beam, and a toroidal type second deflection coil for deflecting in a vertical direction the electron beam. The color CRT device satisfies a following relational expression: ##EQU1## where L mm denotes a distance between a central position of the gap and an end surface of the core on a side of the stem, PA1 D mm denotes an inner diameter of the core on the side of the stem, PA1 .theta. denotes a maximum deflection angle of the cathode ray tube, and PA1 K denotes the aspect ratio.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.