Cathode for image intensifier tube having reduced veiling glare
US4961025A · kind A · utility
8Cited by
9References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 18, 1988 |
| Grant date | Oct 2, 1990 |
| Priority date | — |
| Expiry date | Aug 18, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J2229/8922
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An image intensifier tube has a faceplate formed of optical material. The outer surface of the faceplate has light receiving and light transmitting surfaces and a layer of a reduced metal oxide material for reducing stray light which is transmitted into the faceplate and reflected off of internal surfaces thereof. The layer has a blackened appearance and is formed by reducing the metal oxide of the faceplate material with hydrogen at a predetermined pressure and temperature to cause the blackening to reach a depth sufficient to reduce transmission of stray light therethrough.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.