Electric lamp and discharge devices – Cathode ray tube – Ray generating or control
Patent
1978-07-24
1980-10-07
Smith, Alfred E.
Electric lamp and discharge devices
Cathode ray tube
Ray generating or control
313454, 313295, 313349, H01J 2946
Patent
active
042271169
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: 3843902 (1974-10-01), Miram et al.
patent: 4096406 (1978-06-01), Miram et al.
patent: 4145635 (1979-03-01), Tuck
Vacuum Tubes by K. R. Spangenberg; McGraw-Hill Book Co., Inc., New York, 1948; 860 pages.
Kuehne Gerhard B.
Miram George V.
Cole Stanley Z.
Nishimura Keiichi
Roberts Charles F.
Sgarbossa Peter J.
Smith Alfred E.
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