Patent · US Expired

Proximity focused image intensifier having a glass spacer ring between a photocathode and a fluorescent screen disk

US4961026A · kind A · utility

5Cited by

2References

28Claims

0Family size

Assignee

Proxitronic Funk GmbH & Co. KG · DE

Inventors

Hans W. Funk · Hirschberg, DE
Kurt Frank · Schorndorf, DE
Bernd Engel · Stuttgart, DE

Key dates

Filing date	Feb 3, 1989
Grant date	Oct 2, 1990
Priority date	—
Expiry date	Feb 3, 2009

Classification

Technology area (CPC H)Electricity
CPC primaryH01J29/861
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

In an image intensifier comprising an evacuated vessel with a first disk which forms an input window and on whose inner surface a photocathode is disposed, and with a second disk which forms an output window and on whose inner surface a fluorescent screen is disposed. The spacing between the first and second disks is small in relation to the diameter of the image intensifier. The input and output windows are plane-parallel, and a spacer ring is disposed between the first and second disks whose inside diameter increases from the area of the first disk in the direction of the second disk. The spacer ring is spaced at its inside diameter as close as possible to the first disk.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.