Color cathode ray tube
US5525859A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 20, 1994 |
| Grant date | Jun 11, 1996 |
| Priority date | — |
| Expiry date | Dec 20, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J2229/0794
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A color cathode ray tube having an electron beam source has a glass panel with a plurality of fluorescent stripes and a plurality of black stripes located between each two adjacent fluorescent stripes. An aperture grill is located between the electron beam source and the glass panel. A plurality of parallel grill tapes are located between an upper part and a lower part of the aperture grill, and a plurality of slits are provided between each two adjacent grill tapes. The inside stress of a center grill tape is expressed by .alpha., the length of the grill tape at a center of the aperture grill is expressed by L.sub.0, and a grill tape pitch of the aperture grill is expressed by P.sub.ag. The inside stress is expressed by the following formula: EQU .alpha.>(L.sub.0 /P.sub.ag).sup.0.725 *(1.329*10.sup.-2 *L.sub.0 +5.354)*10.sup.-2. The above formula for the inside stress of a center grill tape in a color cathode ray tube having an aperture grill, acts so as to reduce picture quality deterioration generated by a vibration, such as voice output from a speaker.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.