Zero-bias gridded gun

Details Zero-bias gridded gun Zero-bias gridded gun

1980-04-14

1982-03-23

Chatmon, Jr., Saxfield

Electric lamp and discharge devices

Cathode ray tube

Ray generating or control

313454, 313348, 315 35, H01J 2946

Patent

active

043215050

ABSTRACT:
A gun for a linear-beam electron tube has a control grid for modulating the beam current which consists of an array of conductive web elements whose spacing from each other is much larger than their spacing from the concave emissive surface of the cathode. It was found that when this condition is met the grid can be operated at cathode potential while beam current is being drawn without distorting the electric accelerating field enough to ruin the focusing of the beam. Thus, when the grid is used to pulse the beam current on and off, it can have zero bias in the "on" condition, whereby the pulse modulator can be greatly simplified.

REFERENCES:
patent: 2947905 (1960-08-01), Pierce
patent: 3484645 (1969-12-01), Drees
patent: 3558967 (1971-01-01), Miriam
patent: 3818260 (1974-06-01), Elfe, Jr. et al.
patent: 3859552 (1975-01-01), Hechtel
patent: 3967150 (1976-06-01), Lien et al.
patent: 4023061 (1977-05-01), Berwick et al.
patent: 4096406 (1978-06-01), Miram et al.

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