Tension mask color cathode ray tube front assembly having a stabilized mask support frame
US4725756A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 3, 1986 |
| Grant date | Feb 16, 1988 |
| Priority date | — |
| Expiry date | Mar 3, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J2229/0722
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A front assembly for a color cathode ray tube is disclosed. The tube includes a faceplate having on its inner surface a centrally disposed phosphor screen. A shadow mask support structure is resting on and secured to the inner surface of the faceplate on opposed sides of the screen. A foil shadow mask is secured to the structure under high inward tension. The shadow mask support structure according to the invention is characterized by having at least one foot resting on the inner surface for bracing and stabilizing the structure against upset from the high tension of the mask. Other embodiments of the invention are shown in which one or more of the feet have a plurality of open-ended or closed-ended openings therein for facilitating passage of the cement used for attaching the support structure to the inner surface of the faceplate. The openings according to the invention present cement-contactible edges for enhancing the securement of the support structure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.