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US 6,924,589 B2Granted
Color picture tube device having improved horizontal convergence
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsEtsuji Tagami, Hiroshi Sakurai, Kazuo Nakano
Life of this patent
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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.
Claims25
A color picture tube device that deflects a plurality of electron beams and produces a color image on a phosphor screen, comprising:
- an electron gun which has a plurality of in-line cathodes and emits the plurality of electron beams;
- a deflection yoke which includes a horizontal deflection coil generating a horizontal deflection magnetic field, a vertical deflection coil generating a vertical deflection magnetic field, and a core;
- a quadrupole magnetic field generation unit which generates, between the phosphor screen and an end of a deflection region facing the electron gun, a quadrupole magnetic field having a vertical component and a horizontal component, the vertical component causing the plurality of electron beams to move toward or away from each other in a horizontal direction, the deflection region being where the horizontal and vertical deflection magnetic fields have deflection effects, the quadrupole magnetic field generation unit includes a core piece and a first wire wound around the core piece;
- and
- an auxiliary magnetic field generation unit which generates an auxiliary magnetic field for canceling out at least a part of the horizontal component of the quadrupole magnetic field, according to vertical deflection of the plurality of electron beams by the vertical deflection magnetic field,
- the auxiliary magnetic field generation unit includes a second wire wound around the core piece,
- the core piece, the first wire, and the second wire from a magnetic coil, and
- a magnetic flux generated by supplying a current to the second wire has an opposite direction to a direction of a magnetic flux generated by supplying a current to the first wire,
- wherein the quadruple magnetic field generation unit generates a magnetic flux that forms the quadrupole magnetic field, and
- when the plurality of electron beams are vertically deflected, the auxiliary magnetic field generation unit generates a magnetic flux which cancels out a part of the magnetic flux that is generated by the quadrupole magnetic field generation unit on one of upper and lower sides of a horizontal center line of the quadrupole magnetic field to which the plurality of electron beams are vertically deflected.
7 more elements
A color picture tube device that deflects a plurality of electron beams and produces a color image on a phosphor screen, comprising:
- an electron gun which has a plurality of in-line cathodes and emits the plurality of electron beams;
- a deflection yoke which includes a horizontal deflection coil generating a horizontal deflection magnetic field, a vertical deflection coil generating a vertical deflection magnetic field, and a core;
- and
- a quadrupole magnetic field generation unit which generates, between the phosphor screen and an end of a deflection region facing the electron gun, a quadrupole magnetic field having a vertical component and a horizontal component, the vertical component causing the plurality of electron beams to move toward or away from each other in a horizontal direction, the deflection region being where the horizontal and vertical deflection magnetic fields have deflection effects,
- wherein the quadrupole magnetic field generation unit weakens the horizontal component of the quadrupole magnetic field, according to vertical deflection of the plurality of electron beams by the vertical deflection magnetic field.
2 more elements
A color picture tube device that deflects a plurality of electron beams and produces a color image on a phosphor screen, comprising:
- an electron gun which has a plurality of in-line cathodes and emits the plurality of electron beams;
- a deflection yoke which includes a horizontal deflection coil generating a horizontal deflection magnetic field, a vertical deflection coil generating a vertical deflection magnetic field, and a core;
- and
- a magnetic field generation unit which generates, between the phosphor screen and an end of a deflection region facing the electron gun, a magnetic field having a vertical component and a horizontal component, the vertical component causing the plurality of electron beams to move toward or away from each other in a horizontal direction, the deflection region being where the horizontal and vertical deflection magnetic fields have deflection effects,
- wherein a magnetic field which is obtained by superposing the magnetic field generated by the magnetic field generation unit on the horizontal deflection magnetic field has a magnetic flux density distribution that is, as seen from above a tube axis of the color picture tube device, asymmetrical in the horizontal direction.
2 more elements
A color picture tube device that deflects a plurality of electron beams and produces a color image on a phosphor screen, comprising:
- an electron gun which has a plurality of in-line cathodes and emits the plurality of electron beams;
- a deflection yoke which includes a horizontal deflection coil generating a horizontal deflection magnetic field, a vertical deflection coil generating a vertical deflection magnetic field, and a core;
- a quadrupole magnetic field generation unit which generates, between the phosphor screen and an end of a deflection region facing the electron gun, a quadrupole magnetic field having a vertical component and a horizontal component, the vertical component causing the plurality of electron beams to move toward or away from each other in a horizontal direction, the deflection region being where the horizontal and vertical deflection magnetic fields have deflection effects;
- and
- a magnetizable member which changes the vertical deflection magnetic field to a compound magnetic field, the compound magnetic field being made up of (a) the vertical deflection magnetic field and (b) a virtual auxiliary magnetic field for canceling out at least a part of the horizontal component of the quadrupole magnetic field in synchronization with vertical deflection of the plurality of electron beams by the vertical deflection magnetic field.
2 more elements
A color picture tube device that deflects a plurality of electron beams and produces a color image on a phosphor screen, comprising:
- an electron gun which has a plurality of in-line cathodes and emits the plurality of electron beams;
- a deflection yoke which includes a horizontal deflection coil generating a horizontal deflection magnetic field, a vertical deflection coil generating a vertical deflection magnetic field, and a core;
- a quadrupole magnetic field generation unit which generates, between the phosphor screen and an end of a deflection region facing the electron gun, a quadrupole magnetic field having a vertical component and a horizontal component, the vertical component causing the plurality of electron beams to move toward or away from each other in a horizontal direction, the deflection region being where the horizontal and vertical deflection magnetic fields have deflection effects;
- and
- an auxiliary magnetic field generation unit which generates an auxiliary magnetic field for canceling out at least a part of the horizontal component of the quadrupole magnetic field, according to vertical deflection of the plurality of electron beams by the vertical deflection magnetic field,
- wherein the quadrupole magnetic field generation unit includes a magnet, and
- the auxiliary magnetic field generation unit includes a wire wound around the magnet.
4 more elements
A color picture tube device that deflects a plurality of electron beams and produces a color image on a phosphor screen, comprising:
- an electron gun which has a plurality of in-line cathodes and emits the plurality of electron beams;
- a deflection yoke which includes a horizontal deflection coil generating a horizontal deflection magnetic field, a vertical deflection coil generating a vertical deflection magnetic field, and a core;
- a quadrupole magnetic field generation unit which generates, between the phosphor screen and an end of a deflection region facing the electron gun, a quadrupole magnetic field having a vertical component and a horizontal component, the vertical component causing the plurality of electron beams to move toward or away from each other in a horizontal direction, the deflection region being where the horizontal and vertical deflection magnetic fields have deflection effects;
- and
- an auxiliary magnetic field generation unit which generates an auxiliary magnetic field for canceling out at least a part of the horizontal component of the quadrupole magnetic field, according to vertical deflection of the plurality of electron beams by the vertical deflection magnetic field,
- wherein the quadrupole magnetic field generation unit includes a core piece which has a magnetic portion and a magnetization portion, and
- the auxiliary magnetic field generation unit includes a wire which is wound around at least a part of the magnetizable portion of the core piece.
4 more elements
Dependencies are inferred from the claim text.