Electron gun with one directly heatable and one indirectly heata

Details Electron gun with one directly heatable and one indirectly heata Electron gun with one directly heatable and one indirectly heata

1986-07-03

1989-02-07

Moore, David K.

Electric lamp and discharge devices

Electrode and shield structures

Indirectly heated cathodes

313237, 313238, H01J 120

Patent

active

048033987

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).

REFERENCES:
patent: 2277024 (1942-03-01), Ruska et al.
patent: 3187216 (1965-06-01), Sciaky
patent: 3273003 (1963-02-01), Dietrich
patent: 4057746 (1977-11-01), Dumont
patent: 4082937 (1978-04-01), Istomin et al.

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