Electron gun for color picture tube

Details Electron gun for color picture tube Electron gun for color picture tube

1991-09-30

1993-09-07

O'Shea, Sandra L.

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

315 15, 313449, H01J 2948

Patent

active

052432548

ABSTRACT:
An electron gun for a color picture tube comprising six spaced grid electrodes aligned in the direction that electron beams proceed. The fourth grid electrode comprises a pair of plate-shaped grid electrodes arranged to form a space therebetween and electrically connected with each other. Both plate-shaped grid electrodes are also connected with the second of the grid electrodes so that they receive the same voltage. The space defined between both plate-shaped grid electrodes is variable within the range corresponding to 0.29 to 1.15 times the thickness of each plate-shaped grid electrode. By the construction of the fourth grid electrode, the spaces defined between respective adjacent grid electrodes can be reduced. As a result, the generation of undesirable stray is restricted. Also, the kind of using electrodes can be widely selected, since the space defined between one side fourth grid electrode and the other side fourth grid electrode can be varied.

REFERENCES:
patent: 4443736 (1984-04-01), Chen
patent: 4825120 (1989-04-01), Takahashi
patent: 4940917 (1990-07-01), Stil
patent: 5036258 (1991-07-01), Chen et al.

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