Color picture tube with reduced dynamic focus voltage

Details Color picture tube with reduced dynamic focus voltage Color picture tube with reduced dynamic focus voltage

1994-11-07

1997-10-14

O'Shea, Sandra L.

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

H01J 2951

Patent

active

056775911

ABSTRACT:
In an in-line color picture tube, the length L of the focussing electrode constituting the main lens of the electron gun is at least two times of the diameter D of the main lens and the focussing electrode includes a first electrode, a second electrode, and a third electrode. The electron gun has a correction electrode for forming a quadrupole lens in at least one of the opposing ends of the first electrode and the second electrode and the opposing ends of the second electrode and the third electrode and a voltage which varies in synchronization with the deflection current is applied to the first electrode and the third electrode, respectively.

REFERENCES:
patent: 5394053 (1995-02-01), Yun

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