Laser lithography of thin film resinates
US4117177A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 13, 1976 |
| Grant date | Sep 26, 1978 |
| Priority date | — |
| Expiry date | Sep 13, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/146
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
The mosaic image screen of a shadow mask color tube has a plurality of sets of elemental screen areas, each of which areas includes a phosphor for emitting light of one of three primary colors and a filter which is transmissive of that color but otherwise is essentially a visible light attenuator. The color filter for the first set is formed by applying a thin film of a metallic resinate of a particular color onto the faceplate, directing a laser beam to the elemental screen areas for the other two primary colors to liquify the film and to withdraw the liquefied film from these areas, and heating the entire film to raise the energy threshold at which liquefaction occurs. Second and third metallic resinate films of the other two colors are similarly processed, and then all three films are heated to volatilize their respective organic material to form the color filters.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.