Cover glass structure of flat type indicator tube
US4090102A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 3, 1977 |
| Grant date | May 16, 1978 |
| Priority date | — |
| Expiry date | Feb 3, 1997 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J7/22
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A flat type indicator tube is provided with a box-like cover glass on a substrate. The cover glass forms an air tight space together with the substrate. In the space, there are provided display sections each consisting of a plurality of anode segments disposed on the substrate, grid and cathode electrodes provided above the display sections. The cover glass is comprised of a flat major section, a side wall and a flange section. The flange section comprises a flat flange contacting the substrate through glass frit and a coupling portion so shaped as to receive one end portion of the exhaust tube therein. A projection is formed on and substantially perpendicular to the inner wall of the coupling portion of the flange section. The projection is contacted and serves to restrict undesired excessive insertion of the exhaust tube into the coupling portion. The exhaust tube is hermetically fixed between the coupling portion and the substrate through glass frit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.