Electron beam focusing device for use in a CRT

Details Electron beam focusing device for use in a CRT Electron beam focusing device for use in a CRT

1988-09-13

1990-12-25

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Plural concentrating, accelerating, and/or de-accelerating...

313450, H01J 2946, H01J 2956

Patent

active

049806068

ABSTRACT:
An electron beam focusing device for use in a cathode ray tube (CRT) including a first and a second conductor film each formed on the inner surface of a neck portion of the CRT, which are spaced apart from each other by a predetermined distance, and a resistive conductor film which connects the first and second conductor films with each other. The first conductor film is located before the second conductor film in a beam travelling direction. The additional conductor film has a higher resistivity than that of the first and second conductor films. The first conductor film is set at a higher potential than the second conductor film. A dark current flowing from a high potential side through the first conductor film, the resistive conductor film and the second conductor film produces a voltage drop across the resistive conductor film so that the surface potential of the resistive conductor film is stabilized, thus forming an electrostatic lens with a stabilized electric field.

REFERENCES:
patent: 3950667 (1976-04-01), De Jong et al.
patent: 4124540 (1978-11-01), Foreman et al.
patent: 4143298 (1979-03-01), Bing et al.
patent: 4243911 (1981-01-01), Winarsky et al.
patent: 4531075 (1985-07-01), Stone

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