Color display tube with magnetic field shaping means

Details Color display tube with magnetic field shaping means Color display tube with magnetic field shaping means

1984-10-03

1986-11-25

DeMeo, Palmer C.

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313414, 313431, H01J 2956, H01J 2964

Patent

active

046251456

ABSTRACT:
In a color display tube having an electron gun of the "in-line" type for generating three electron beams situated with their axes in one plane, the electron gun includes curved field shapers at the end from which the beams exit into frame and line deflection fields. Each field shaper includes two or more plates of ferromagnetic material aligned along a curve and spaced from each other by slots. The plates are arranged symmetrically with respect to the plane and the central beam axis, and a concave side of each field shaper faces the three beam axes. At least the ends of each field shaper which are most remote from the plane have substantially flat plates extending in the direction of the central electron beam axis. By using such field shapers the losses in the line deflection field are small and substantially undistorted, while a desirable pincushion-shaped distortion of the frame deflection field is intensified.

REFERENCES:
patent: 3594600 (1971-07-01), Murata et al.
patent: 3860850 (1975-01-01), Takenaka et al.
patent: 4196370 (1980-04-01), Hughes
patent: 4220897 (1980-09-01), Barten et al.
patent: 4237437 (1980-12-01), Vink et al.
patent: 4495438 (1985-01-01), Kornaker

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