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

1997-06-12

1999-08-10

Husar, Stephen

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

315 15, H01J 2951

Patent

active

059363371

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 consists of 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.

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patent: 5621286 (1997-04-01), Toujou et al.
"Development of Color Picture Tube with Hi-UPF Electron Gun", M. Fukushima et al, Dec. 19, 1977, Electron Device Meeting Material EDD-77-138, and Translation of an Extract.

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