Improved mesh for CRT scan expansion lens and lens fabricated therefrom
US4767964A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 4, 1987 |
| Grant date | Aug 30, 1988 |
| Priority date | — |
| Expiry date | Feb 4, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J29/806
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An improved mesh lens for PDA-type cathode-ray tubes is constructed in a manner that permits deformation into a concavo-convex shape with a substantially shorter radius of curvature than heretofore obtainable with prior art devices. A mesh lens (12) formed in accordance with this invention particularly comprises of multitude of interconnected webs (58) forming an array of apertures (60). Each web (58) has opposing ends and a midline (62) extending between those ends. The mesh (12) is configured so that an individual aperture (60) of the array is formed by a set of webs (58) interconnected at their ends. The midline (62) of each web in the undeformed mesh defines a bent line. The mesh can be deformed into a concavo-convex shape having a relatively short radius of curvature. This is so because the individual webs of the mesh respond to the application of deformation forces by initially straightening, thereby effectively delaying the development of tensile stresses in the webs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.