Color cathode ray tube apparatus

Details Color cathode ray tube apparatus Color cathode ray tube apparatus

1993-06-30

1996-02-27

Coles, Sr., Edward L.

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313433, H01J 2950

Patent

active

054951399

ABSTRACT:
In a color cathode ray tube apparatus wherein three in-line electron beams are deflected by horizontal and vertical deflection magnetic fields of a deflector. The three in-line electron beams are arranged along an axis that is inclined with respect to a horizontal axis perpendicular to the tube axis and are emitted from an electron beam producing unit. Of the three electron beams, the center beam is focused at a higher degree than the pair of side beams by an electric field lens forming unit. The pair of side beams are deflected by a deflecting unit in the direction of arrangement of the three electron beams away from the center beam and are made incident on a focusing magnetic field generating device constituting a common magnetic field focusing type electron lens for focusing and converging the three electron beams. Then, the three electron beams are directed to a phosphor screen. Accordingly, the electron beams are desirably focused and converged on the phosphor screen with a small beam spot size.

REFERENCES:
patent: 4468587 (1984-08-01), Sluyterman
patent: 5113112 (1992-05-01), Shimoma et al.
patent: 5202604 (1993-04-01), Kweon
patent: 5281892 (1994-01-01), Kweon

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