Method of manufacturing a color TV focusing mask
US4659317A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 26, 1981 |
| Grant date | Apr 21, 1987 |
| Priority date | — |
| Expiry date | May 26, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J9/146
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method of manufacturing a focusing shadow mask for a color cathode ray tube is disclosed in which two conductive plates or surfaces, forming the electrode structure, are secured together by insulating material so that they do not contact each other. Strips or columns of insulating material are accurately located with respect to the matrix of apertures formed in the focus mask by etching cavities which may be in the form of grooves within at least one of the plates forming the electrode structure between adjacent aperture areas, and filling such accurately positioned cavities with a dielectric frit material, and then after firing such frit material etching away the surface of the plate so as to provide raised strips or pillars of insulator material firmly bonded and embedded in the mask structure. Finally, a conductive surface film or second conductive plate is provided on the raised insulating frit material by depositing a film of conductive metallic material on the surface of the frit, such as aluminum deposited by an evaporation technique, or by bonding such second conductive plate to the surface of the insulating frit material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.