JP2569370Y2 - Auxiliary coil unit for deflection device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an auxiliary coil unit of a deflecting device, and more particularly to an auxiliary coil unit of a deflecting device capable of correcting convergence deviation with a simple structure.

[0002]

2. Description of the Related Art As an auxiliary coil unit of this kind of deflection device, for example, one disclosed in Japanese Patent Application Laid-Open No. Sho 61-230245 is known. This is shown in FIG. The auxiliary coil unit 52 of this deflecting device has a pair of U-shaped cores 54 and 55 arranged so as to sandwich the neck portion 53 of the color picture tube from above and below, and fits on the central sides of the U-shaped cores 54 and 55. The inserted coil bobbins 54a, 55a and the auxiliary coil 54 wound around the coil bobbins 54a, 55a
b, 55b.

A vertical deflection current or an auxiliary current synchronized with the vertical deflection current is supplied to the auxiliary coils 54b and 55b, and the same as a vertical deflection magnetic field (shown by a solid line) is applied between both legs of the U-shaped cores 54 and 55. Directional pincushion-like auxiliary magnetic fields Ha and Hb (shown by dotted lines) are generated. As a result, the vertical convergence shift VC shown in FIG.
R can be corrected.

[0004] Other related prior arts are disclosed in, for example, JP-A-63-143727 and JP-A-1-175515.
No. 0 discloses this.

[0005]

In recent years, television sets have become more integrated into ICs and LSIs, and a deflection device having a low impedance has been required. Therefore, the number of turns of the vertical deflection coil is reduced, and accordingly, the number of turns of the auxiliary coils 54b and 55b is also reduced. However, when the number of turns of the auxiliary coils 54b and 55b is reduced, as shown in FIG.
4a, 55a, the magnetic flux leakage due to the auxiliary coils 54b, 55b becomes unbalanced in the right and left directions.
In addition, the strength of the magnetic field between the two legs of the cores 54 and 55 on which this is superimposed also becomes unbalanced in the left and right, and there is a problem that it is not possible to properly correct the deviation of convergence.

SUMMARY OF THE INVENTION An object of the present invention is to provide an auxiliary coil unit of a deflecting device capable of satisfactorily correcting convergence deviation even when the number of turns of the auxiliary coil is small.

[0007]

According to a first aspect of the present invention, an auxiliary coil is provided at a central side of a pair of U-shaped cores which are mounted vertically facing each other across a neck portion of a color picture tube. In the auxiliary coil unit of the deflection device for generating an auxiliary magnetic field in the same direction as the direction of the vertical deflection magnetic field, the auxiliary coil has two or more winding layers, and the winding of each layer is
When there is a slight number of wires, the winding arrangement of the layer with the smaller number of windings
The providing auxiliary coil unit of the deflection device according to claim to Rukoto symmetrically structure.

In a second aspect, the present invention comprises a pair of U-shaped cores, which are mounted to face each other up and down with a neck portion of a color picture tube, wound around an auxiliary coil. In the auxiliary coil unit of the deflecting device that generates an auxiliary magnetic field in the same direction as the direction of the vertical deflection magnetic field, the winding layer of the auxiliary coil has a bilaterally symmetric structure, and the auxiliary coil is arranged along the center side of the U-shaped core during adjustment. Provided is an auxiliary coil unit for a deflection device, which is slidable left and right.

[0009]

In the auxiliary coil unit of the deflecting device according to the first aspect of the present invention, since the winding layer of the auxiliary coil has a symmetric structure, even if the number of turns of the auxiliary coil is small, the leakage magnetic flux due to the auxiliary coil is balanced on the left and right. And this was superimposed
The strength of the magnetic field between the two legs of the core is also balanced in the left and right directions, and the convergence deviation can be corrected well.

In the auxiliary coil unit of the deflecting device according to the second aspect of the present invention, the winding layer of the auxiliary coil has a symmetrical structure, and the auxiliary coil is slid left and right along the central side of the U-shaped core during adjustment. The auxiliary coil can be unbalanced due to assembly errors, etc.
Even when you've made in the, it becomes possible to correct the imbalance by sliding the auxiliary coil to the left and right.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. Note that this does not limit the present invention. FIG. 1 is a side view of a deflection device 1 having an auxiliary coil unit 2 according to a first embodiment of the present invention. Deflection device 1
Is mounted on the neck portion of the color picture tube, the U-shaped cores 4 and 5 of the auxiliary coil unit 2 sandwich the neck portion of the color picture tube from above and below. Coiled bobbins 4a, 5a are fitted into the center sides of the U-shaped cores 4, 5, respectively.

FIG. 2 is a sectional view taken along the line AA 'in FIG. Auxiliary coils 4b, 5 are provided on coil bobbins 4a, 5a.
Although b is wound, the winding position is adjusted so that the winding layer has a left-right symmetric structure.

In the above-described auxiliary coil unit 2, since the auxiliary coils 4b and 5b are wound in a symmetrical structure, even if the number of turns of the auxiliary coils 4b and 5b is small,
Even if the leakage flux balances left and right and this is superimposed, the core
The magnetic field between the four legs does not become unbalanced in the left and right directions, so that the convergence deviation can be corrected well.
Become

FIG. 3 is a sectional view of the auxiliary coil unit 22 according to a second embodiment of the present invention. In the auxiliary coil unit 22, the lengths of the coil bobbins 24a and 25a are about 2/3 of the length of the center sides of the U-shaped cores 24 and 25, and the lengths on the center sides of the U-shaped cores 24 and 25 are approximately It is slidable by 1/3 the length. The state slid to the left end of the center side is indicated by a solid line, and the state slid to the right end of the center side is indicated by a dotted line. Auxiliary coils 24b and 25b are wound around the coil bobbins 24a and 25a, and the winding positions are adjusted so that the winding layers have a symmetric structure.

FIG. 4 shows that the auxiliary coil 24b is
4 shows a state in which the auxiliary coil 25b is located at the right end of the central side of the U-shaped core 25 and is located at the left end of the central side of the U-shaped core 25.
In this state, the strength of the magnetic field between the two legs of the core 24 is compensated.
Since the leakage magnetic flux of the auxiliary coil 24b is superimposed, the magnetic flux is biased rightward. On the other hand, the strength of the magnetic field between the two legs of the core 25 depends on the leakage magnetic flux of the auxiliary coil 25b,
It will be biased to the left. Therefore, the forces acting on the R, G, and B beams are in the direction of the arrow shown in FIG. 5A for upward deflection, and in the direction of the arrow shown in FIG. 5B for downward deflection. . Therefore, the magnitude of the vertical component force in the R, G, and B beams is such that the R beam> G beam>
B beam, and in the case of downward deflection, B beam> G beam>
It becomes an R beam.

Therefore, as for the convergence in the vertical direction, as shown in FIG. 6, a correction can be given to shift the R beam upward with respect to the G beam and shift the B beam downward. As for the orthogonal distortion, as shown in FIG. 7, it is possible to give a correction to tilt the G beam to the right with respect to the R and B beams.

FIG. 8 shows that the auxiliary coil 24b is
4, the auxiliary coil 25b is located at the right end of the central side of the U-shaped core 25.
In this state, the strength of the magnetic field between the two legs of the core 24 is compensated.
Since the leakage flux of the auxiliary coil 24b is superimposed, the magnetic flux is biased to the left. On the other hand, the strength of the magnetic field between the two legs of the core 25 depends on the leakage magnetic flux of the auxiliary coil 25b,
It will be biased to the right. Therefore, the force acting on the R, G, B beams is in the direction of the arrow shown in FIG. 9A for upward deflection, and in the direction of the arrow shown in FIG. 9B for downward deflection. . Therefore, the magnitude of the vertical component in the R, G, and B beams is such that the R beam <G beam <
B beam, B beam <G beam <
It becomes an R beam.

Therefore, as for the convergence in the vertical direction, as shown in FIG. 10, a correction can be given to shift the R beam downward with respect to the G beam and shift the B beam upward. Further, as for the orthogonal distortion, as shown in FIG. 11, a correction can be given to tilt the G beam to the left with respect to the R and B beams.

FIG. 12 shows a state in which the auxiliary coils 24b and 25b are located at the right ends of the center sides of the U-shaped cores 24 and 25. In this state, the intensity of the magnetic field generated by the auxiliary coils 24b and 25b is biased rightward. Therefore, the force acting on the R, G, and B beams is in the direction of the arrow shown in FIG. 13A for upward deflection, and in the direction of the arrow shown in FIG. 13B for downward deflection. . Therefore,
The magnitude of the vertical component of the R, G, and B beams is as follows: R beam> G beam> B beam for upward deflection, and R beam> G beam> B beam for downward deflection.

Therefore, as for the convergence in the vertical direction, as shown in FIG. 14, the R beam is shifted upward, the B beam is shifted downward with respect to the G beam, and the G beam is shifted downward with respect to the G beam. A correction for shifting the R beam downward and shifting the B beam upward can be given. Note that the orthogonal distortion is not affected.

FIG. 15 shows a state in which the auxiliary coils 24b and 25b are located at the left end of the center sides of the U-shaped cores 24 and 25. In this state, the intensity of the magnetic field generated by the auxiliary coils 24b and 25b is biased to the left. Therefore, the force acting on the R, G, B beams is in the direction of the arrow shown in FIG. 16A for upward deflection, and in the direction of the arrow shown in FIG. 16B for downward deflection. . Therefore,
The magnitude of the vertical component of the R, G, and B beams is as follows: R beam <G beam <B beam for upward deflection, and R beam <G beam <B beam for downward deflection.

Therefore, as for the convergence in the vertical direction, as shown in FIG. 17, the R beam is shifted downward, the B beam is shifted upward with respect to the G beam, and the G beam is shifted downward with respect to the G beam. A correction can be given to shift the R beam upward and shift the B beam downward. Note that the orthogonal distortion is not affected.

As described above, in the second embodiment, by sliding the auxiliary coil on the central side of the U-shaped core,
Vertical convergence and orthogonal distortion can be freely corrected. Therefore, it is possible to freely correct a deviation of convergence and an orthogonal distortion caused by an assembly error or a variation in characteristics of the deflection coil. After the adjustment, the auxiliary coils 24b and 2
Fix the position of 5b.

[0024]

According to the auxiliary coil unit of the deflecting device of the present invention, the deviation of the convergence and the orthogonal distortion can be satisfactorily corrected with a simple configuration.

[Brief description of the drawings]

FIG. 1 is a side view showing a configuration of a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line A-A 'in FIG.

FIG. 3 is a sectional view showing the configuration of a second embodiment of the present invention.

FIG. 4 is an exemplary view showing a position of an auxiliary coil of FIG. 3;

FIG. 5 is an explanatory diagram showing directions of forces applied to B, G, and R beams.

FIG. 6 is an explanatory diagram showing convergence characteristics.

FIG. 7 is an explanatory diagram showing orthogonal distortion.

FIG. 8 is another example of the position of the auxiliary coil of FIG. 3;

FIG. 9 is an explanatory diagram showing directions of forces applied to B, G, and R beams.

FIG. 10 is an explanatory diagram showing convergence characteristics.

FIG. 11 is an explanatory diagram showing orthogonal distortion.

FIG. 12 is a view showing still another example of the position of the auxiliary coil of FIG. 3;

FIG. 13 is an explanatory diagram showing directions of forces applied to B, G, and R beams.

FIG. 14 is an explanatory diagram showing convergence characteristics.

FIG. 15 is a view showing still another example of the position of the auxiliary coil of FIG. 3;

FIG. 16 is an explanatory diagram showing directions of forces applied to B, G, and R beams.

FIG. 17 is an explanatory diagram showing convergence characteristics.

FIG. 18 is a side view showing a configuration of a conventional auxiliary coil unit.

FIG. 19 is an explanatory diagram showing convergence characteristics.

FIG. 20 is a cross-sectional view showing a configuration of a conventional auxiliary coil unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Deflection device 2 Auxiliary coil unit 4, 5 U-shaped core 4a, 5a Coil bobbin 4b, 5b Auxiliary coil

Claims (2)

(57) [Scope of request for utility model registration] 1. A color picture tube having a neck portion sandwiched vertically
Each at the center of a pair of U-shaped cores
The auxiliary coil is wound around the
Auxiliary coil unit of the deflection device that generates a unidirectional auxiliary magnetic field
In the,  The winding layer of the auxiliary coilMore than two layers, depending on the number of turns in each layer
When there is some, arrange the windings of the layer with a small number of turns.Left and right
Symmetric structureNasuAuxiliary coil for deflection device characterized by the following:
unit. 2. A pair of U-shaped cores mounted vertically opposite each other across a neck portion of a color picture tube, and auxiliary coils wound around respective central sides thereof, in the same direction as the direction of the vertical deflection magnetic field. In the auxiliary coil unit of the deflection device for generating the auxiliary magnetic field, the winding layer of the auxiliary coil has a left-right symmetric structure, and the auxiliary coil can slide left and right along the center side of the U-shaped core during adjustment. An auxiliary coil unit for a deflecting device.