Patent · US Expired

Electron beam generator

US4980558A · kind A · utility

2Cited by

12References

12Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Harald Rose · Darmstadt, DE
Gerald Schoenecker · Munich, DE

Key dates

Filing date	Jul 13, 1989
Grant date	Dec 25, 1990
Priority date	—
Expiry date	Jul 13, 2009

Classification

Technology area (CPC H)Electricity
CPC primaryH01J37/3007
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

An electron beam generator or electron gun has a line-shaped cathode with a flattened tip as an electron source, a slotted diaphragm disposed in the plane of the cathode tip, and a double anode having two electrodes also fashioned as slotted diaphragms. The voltage potentials of the three slotted diaphragms, and their respective distances to the cathode, are selected such that a stigmatic virtual electron source at infinity is obtained.

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