Color cathode ray tube having electron gun with reduced eddy cur

Details Color cathode ray tube having electron gun with reduced eddy cur Color cathode ray tube having electron gun with reduced eddy cur

1984-02-09

1986-06-03

Moore, David K.

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313412, H01J 2951

Patent

active

045932263

ABSTRACT:
A color cathode ray tube has a three beam, in-line electric gun in one end of the tube focused on a phosphor screen on the other end of the tube. A common magnetic deflection field controls all three beams, thereby causing a coma distortion, if not corrected. The three beams pass through three aligned apertures in the bottom of a shield cup which corrects the distortion. As a result, eddy currents might form around the apertures to defeat its corrective functions. These eddy currents are eliminated by slender cuts formed in the shield cup and radiating from the two outside apertures.

REFERENCES:
patent: 2617061 (1952-11-01), Gier
patent: 4196370 (1980-04-01), Hurhes
patent: 4449069 (1984-05-01), Assil et al.

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