Method for manufacturing a shadow mask of a Fe-Ni alloy
US5164021A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 14, 1990 |
| Grant date | Nov 17, 1992 |
| Priority date | — |
| Expiry date | Nov 14, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J9/142
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In composition of a Fe-Ni alloy used for television shadow masks and containing in, Co, Mn, Si and Cr as the major components, additional inclusion of Be assures high deformation resistance and easy pore formation via etching without impairing its inherent low thermal expansion. Introduction of annealing at 800.degree. to 1200.degree. C. temperature into production process sufficiently lowers proof stress of the product without causing any noticeable crystal coarseness. Increased mechanical strength enables production of a thin shadow mask material well suited for pore formation via etching, thereby assuring high grade screen display.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.