Film for correcting spatial irregularity in the gain of optical images of intensifier tubes
US4187002A · kind A · utility
4Cited by
5References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 28, 1977 |
| Grant date | Feb 5, 1980 |
| Priority date | — |
| Expiry date | Oct 28, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/205
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The present invention relates to a film for correcting gain irregularities occurring between the different points of optical images. The film applied to the image is split into elementary areas of constant transparency. Within each of these areas, the transparency is adjusted by opaque parts separated by transparent parts. The product of the gain of the image by the transparency of the film is maintained constant over the whole of the area of the image. In the example, these elementary areas are squares and the opaque parts are strips of fixed width. Application is to the image intensifier tubes of scintillography circuits.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.