Cathode for an electron gun

Details Cathode for an electron gun Cathode for an electron gun

1979-02-26

1980-09-02

Smith, Alfred E.

Electric lamp and discharge devices

With temperature modifier

For filament or heated cathode

313270, 313341, H01J 115, H01J 1916

Patent

active

042208890

ABSTRACT:
A cathode for an electron gun in which a lanthanum hexaboride cap has an internal recess which accommodates a pyrolytic graphite heater element. The cap is cup-shaped, while the heater element is in the form of a frustum of a cone and is resiliently maintained in abutting relationship with the cap by a corrugated tubular member and an assembly of rigid tubes. A cylindrical shell surrounds the periphery of the cap, and a pair of generally conical shielding elements are located in position to intercept stray thermal radiation from the heater element. All of these cathode components are supported in coaxial relationship with each other within the electron gun.

REFERENCES:
patent: 2498775 (1950-02-01), Watrous, Jr.
patent: 3440475 (1969-04-01), Schiller et al.
patent: 3532923 (1970-10-01), Vogel
patent: 3958146 (1976-05-01), Buescher et al.
patent: 4068145 (1978-01-01), Nakagawa et al.

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