Method for making shadow mask for color picture tube and a shadow mask made thereby
US5752755A · kind A · utility
3Cited by
3References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 5, 1996 |
| Grant date | May 19, 1998 |
| Priority date | — |
| Expiry date | Jul 5, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J2229/0777
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A shadow mask for color picture tubes made of AK steel has an Ni layer on its surface so that an Fe-Ni alloy layer is obtained in a hydrogen heating furnace to induce substance diffusion of both the Ni layer and the AK steel shadow mask. A method for making shadow mask for color picture tubes including the steps of making a main flat shadow mask body with AK steel, coating its surface with Ni, forming an Fe-Ni alloy layer on the main flat shadow mask, and pressing the main flat shadow mask body to form a certain shape.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.