Patent · US Expired

Electron gun with one directly heatable and one indirectly heatable cathode

US4803398A · kind A · utility

4Cited by

5References

3Claims

0Family size

Assignee

Leybold-Heraeus GmbH · DE

Inventors

Reinhardt Kraft · Schongau, DE
Horst Ranke · Alzenau, DE

Key dates

Filing date	Jul 3, 1986
Grant date	Feb 7, 1989
Priority date	—
Expiry date	Jul 3, 2006

Classification

Technology area (CPC H)Electricity
CPC primaryH01J3/027
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

An electron gun with one directly heatable initial cathode (2), one indirectly heatable second blocking cathode (3) and one focusing electrode (17). The focusing electrode (17) presents an initial centering region (18) and, by means of supporting braces, the blocking cathode (3) is fixed concentrically in a carrier ring (19) presenting a second centering region complementary to the first centering region (18). This permits the blocking cathode (3) to be introduced into the focusing electrode from the back by means of the carrier ring (19), and the carrier ring (19) is secured by means of a locking ring (24).

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