Color picture tube apparatus having a pair of bar shaped...

Details Color picture tube apparatus having a pair of bar shaped... Color picture tube apparatus having a pair of bar shaped...

2006-05-02

2006-05-02

Williams, Joseph (Department: 2879)

Electric lamp and discharge devices

Cathode ray tube

Ray generating or control

C313S440000, C313S441000

Reexamination Certificate

active

07038368

ABSTRACT:
On an outer circumferential surface of a neck portion of a funnel, a CPU having a pair of quadrupole magnets and a pair of bar-shaped magnets each having magnetic poles on both sides in a major axis direction are provided. The pair of bar-shaped magnets sandwich the neck portion substantially in an in-line direction of an in-line type electron gun, and are provided so that identical poles are opposed to each other, between an end plate of an insulating frame of a deflection yoke and the CPU at a distance from the end plate. In the case where a rotational shift of electron beams is caused, electron beams R and B are corrected so as to move upward and downward (or downward and upward) respectively by a quadrupole magnetic field generated by the quadrupole magnets. Then, the electron beams R and B are corrected so as to move downward and upward (or upward and downward) respectively by the quadrupole magnetic field generated by the pair of bar-shaped magnets. Thus, a misconvergence due to the rotational shift of the electron beams can be corrected.

REFERENCES:
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patent: 11-260287 (1999-09-01), None
patent: 2002-25469 (2002-01-01), None

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