Color picture tube device having improved horizontal...

Details Color picture tube device having improved horizontal... Color picture tube device having improved horizontal...

2005-08-02

2005-08-02

Patel, Vip (Department: 2879)

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

C313S440000, C313S442000

Reexamination Certificate

active

06924589

ABSTRACT:
A color picture tube device that can adjust convergence without causing increases in cost and in power consumption is provided. One pair of magnetic flux generation means for generating a static quadrupole magnetic field are positioned above and below an area where a plurality of electron beams pass through. The static quadrupole magnetic field has an effect of adjusting convergence in a horizontal direction. In this construction, a magnetic flux generated by one of the two magnetic flux generation means that is closer to the plurality of electron beams is reduced, in sync with deflection of the plurality of electron beams in a vertical direction.

REFERENCES:
patent: 4231009 (1980-10-01), Barkow
patent: 5565732 (1996-10-01), Sluyterman et al.
patent: RE35548 (1997-07-01), Sluyterman et al.
patent: 02-239545 (1990-09-01), None
patent: 2001-043815 (2001-02-01), None

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