JPH10255688A - Deflection yoke - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a deflection yoke capable of being stably held regardless of the form of a horizontal, deflection coil, and ensuring the electric insulating property with a vertical deflection coil. SOLUTION: In a deflection yoke having a substantially cylindrical separator 20, and a saddle-shaped horizontal deflection coil 21 arranged at least in contact with the inside of the separator 20 to generate mainly a pincushion-shaped horizontal deflecting magnetic field, the inner circumferential circular form of the part making contact with the horizontal deflection coil 21 of the separator 20 is conformed to the outside circumferential form of the horizontal coil 21, and the inner circumferential form near the vertical axis non-contact with the deflection coil 21 is situated on the outside of the circumferential form when the inner circumferential circular form of the contact part is extended to the vertical axis.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a deflection yoke for a cathode ray tube, and more particularly to a deflection yoke suitable for an in-line type color picture tube in which three electron beams arranged in a line are concentrated by a deflection magnetic field generated by the deflection yoke.

[0002]

2. Description of the Related Art At present, in-line type color picture tubes are often used in TV picture sets and cathode ray tube display devices. This in-line type color picture tube, as shown in FIG. 5, emits three electron beams 4B, 4G, 4R in a line on the same horizontal plane and emitted from an electron gun 3 disposed in a neck 2 of a funnel 1. Deflection yoke 6 mounted outside near the boundary between large diameter portion 5 and neck 2 of funnel 1
Is generated by the horizontal and vertical deflection magnetic fields, and the phosphor screen 9 formed of a three-color phosphor layer that emits blue, green, and red light formed on the inner surface of the panel 8 through the shadow mask 7 is horizontally and vertically polarized. It is formed in a structure for displaying a color image by performing vertical scanning.

In this in-line type color picture tube, the horizontal deflection magnetic field generated by the deflection yoke 6 is mainly a pincushion type, and the vertical deflection magnetic field is a barrel type. The electron beams 4B, 4G, and 4R can be concentrated, and the deflection distortion can be reduced. The deflection yoke 6
A pair of saddle-type horizontal deflection coils 12 are disposed inside a substantially cylindrical separator 11 made of an insulating material such as a synthetic resin, and a pair of toroidal types wound around a cylindrical core 13 outside the separator 11. It is formed in a structure in which the vertical deflection coils 14 are arranged.

Such a deflection yoke 6 has a winding distribution in the cross section of each horizontal deflection coil 12 of c which is used for a color picture tube having a relatively small deflection angle.
os ^x θ distribution. The horizontal deflection coil 12 having such a distribution matches the circumferential shape of the inner surface of the separator 11 and has a shape suitable for obtaining a large deflection efficiency. For a deflection yoke used in a picture tube having a large deflection angle, in order to obtain an optimum magnetic field distribution, the magnetic field distribution of the horizontal and vertical deflection coils 12 and 14 is optimized, and an auxiliary deflection coil, a permanent magnet, a magnetic field correction It can be made practical by adding magnetic pieces for use.

As shown in FIG. 6, the deflection yoke 6 has a shape in the circumferential direction inside a horizontal deflection coil 12 disposed inside a separator 11 in order to avoid a decrease in deflection efficiency. Has a circular arc shape that substantially matches the outer shape near the boundary between the large diameter portion of the funnel and the neck. The outer circumferential shape of the horizontal deflection coil 12 has an arc shape that substantially matches the inner circumferential shape of the separator 11 so that it can be compactly and tightly held inside the separator 11. In general, a line 16 (dashed line) extending the inner circumferential shape of the horizontal deflection coil 12 to the vertical axis (V axis) is a line extending the outer circumferential shape of the horizontal deflection coil 12 to the vertical axis,
That is, even if the horizontal deflection coil 12 is brought into close contact with the outer surface near the boundary between the large diameter portion of the funnel and the neck, the inner surface near the vertical axis of the separator 11 is prevented from intersecting with the circumferential arc shape of the inner surface of the separator 11. A gap is formed between the separator 11 and the outer surface of the funnel, and the separator 11 does not contact the outer surface of the funnel.

However, assuming that the winding distribution of the horizontal deflection coil 12 is a distribution that strengthens the pincushion magnetic field component of the horizontal deflection magnetic field, the circumferential shape inside the horizontal deflection coil 12 is extended to the vertical axis as shown in FIG. The line 16 (dashed line) intersects with the line 17 (dashed line) that extends the outer circumferential shape of the horizontal deflection coil 12 to the vertical axis. In such a deflection yoke, the inner surface near the vertical axis of the separator 11 comes into contact with the outer surface of the funnel, so that the deflection yoke 6 may not be mounted at a desired position.

[0007]

As described above, the deflection yoke mounted on the in-line type color picture tube has a circumferential shape inside the horizontal deflection coil disposed inside the separator, and the deflection yoke is mounted on the horizontal deflection coil. It has an arc shape that substantially matches the outer shape near the boundary between the large diameter portion of the funnel and the neck, and the outer circumferential shape of the horizontal deflection coil substantially matches the inner circumferential shape of the separator. It has an arc shape. In general, even when the horizontal deflection coil is closely attached to the outer surface near the boundary between the large diameter portion of the funnel and the neck, a gap is formed between the inner surface near the vertical axis of the separator and the outer surface of the funnel, Are not in contact with the outer surface of the funnel. However, if the winding distribution of the horizontal deflection coil is set to increase the pincushion magnetic field component of the horizontal deflection magnetic field, the inner surface near the vertical axis of the separator comes into contact with the outer surface of the funnel, and the deflection yoke may not be mounted at a desired position. There is a problem.

To solve such a problem, FIG.
As shown in the figure, the separator 1 is in contact with the outer surface of the funnel.
1 may be removed to remove the vicinity of the vertical axis and provide a structure having an opening 19, but if such an opening 19 is formed, insulation with the toroidal vertical deflection coil 14 disposed outside the separator 11 is reduced. However, the electrical insulation of these two coils cannot be guaranteed. As described above, even if the electrical insulation between the two coils is reduced, the deflection yoke of the color picture tube, which is small and has a small deflection angle, in which high voltage is not applied to the deflection coil,
Although there is almost no problem, there is a problem with a deflection yoke of a color picture tube having a large deflection angle.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and is capable of stably holding a horizontal deflection coil irrespective of the shape of the horizontal deflection coil and ensuring electrical insulation with a vertical deflection coil. It is intended to constitute a yoke.

[0010]

A deflection yoke having a substantially cylindrical separator and a saddle type horizontal deflection coil which is arranged at least in contact with the inside of the separator and mainly generates a pincushion type horizontal deflection magnetic field.
The circular arc shape of the inner surface of the part in contact with the horizontal deflection coil of the separator matches the outer circumferential shape of the horizontal deflection coil, and the inner surface circumferential shape near the vertical axis where the horizontal deflection coil does not contact is in contact with the horizontal deflection coil. The circular arc shape in the inner circumferential direction of the portion to be extended is located outside the circumferential shape when the arc shape is extended to the vertical axis.

[0011] Further, the inner circumferential shape near the vertical axis of the separator is an arc shape, and the curvature of the inner circumferential shape near the vertical axis is changed to the inner circumferential shape of the portion in contact with the horizontal deflection coil. Greater than the curvature.

In addition, between the portion of the separator that contacts the horizontal deflection coil and the portion of the vertical axis, a portion that contacts the horizontal deflection coil and a portion near the vertical axis that has a different inner circumferential shape from the inner circumferential shape. Intervened.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of a deflection yoke for an in-line type color picture tube. The deflection yoke is a substantially cylindrical separator 2 made of an insulating material such as a synthetic resin.
0, a pair of saddle-type horizontal deflection coils 21 arranged inside the separator 20 and mainly generating a pincushion-type horizontal deflection magnetic field, and wound around a cylindrical core 22 and arranged outside the separator 20. And a pair of toroidal vertical deflection coils 23 mainly generating a barrel type vertical deflection magnetic field. The circumferential shape inside the horizontal deflection coil 21 is formed in an arc shape that substantially matches the circumferential shape near the boundary between the large diameter portion of the funnel and the neck of the color picture tube.

In particular, in the embodiment of the present invention, the separator 20 is formed in a shape shown in FIG. That is, the inner circumferential shape of the portion in contact with the horizontal deflection coil 21 is formed in an arc shape that matches the outer circumferential shape of the horizontal deflection coil 21, and the vicinity of the vertical axis (V axis) where the horizontal deflection coil 21 does not contact is formed. The shape of the inner surface in the circumferential direction is formed as an arc having a larger curvature than the arc of the inner surface of the portion in contact with the horizontal deflection coil 21. The vicinity of the vertical axis is located outside the circumferential shape indicated by the broken line 25 when the arc of the inner surface of the portion in contact with the horizontal deflection coil 21 is extended to the vertical axis. In this case, as shown in FIG. 3, an inner circumferential arc 27 at a portion that contacts the horizontal deflection coil and an inner circumferential arc 29 near the vertical axis are directly connected via a contact 28. Has become.

The outer surface of the separator 20 has a shape conforming to the inner surface so that the separator 20 has a predetermined thickness.

When the separator 20 is formed in the above shape and the saddle type horizontal deflection coil 21 is disposed inside the separator 20, the winding distribution of the horizontal deflection coil 21 is changed to change the magnetic field distribution of the generated pincushion type horizontal deflection magnetic field. Even if it is changed, the vicinity of the vertical axis of the separator 20 can be prevented from contacting the outer surface of the funnel, the desired deflection yoke which keeps the horizontal deflection coil 21 in a predetermined position and does not lower the insulation with the vertical deflection coil 22 Can be configured.

In the above-described embodiment, the arc in the inner circumferential direction at the portion in contact with the horizontal deflection coil and the arc in the inner circumferential direction near the vertical axis are connected directly via the contact point. As shown in FIG. 4A, the connection may be made via a step portion 29, or as shown in FIG. 4B, the connection may be made via a linear portion 30. Thus, both arcs 2
When the parts 6, 27 are connected via the step part 29, the straight part 30, etc., the degree of freedom in selecting the circular arc shape in the inner circumferential direction near the vertical axis is increased, and the optimum shape can be easily obtained.

Further, in the above embodiment, the inner circumferential shape of the separator is constituted by the two arcs having different curvatures at the portion in contact with the horizontal deflection coil and near the vertical axis.
The inner circumferential shape of the separator may be constituted by two or more arcs having different curvatures.

In the above-described embodiment, the circumferential shape has been described for a partial cross section of the separator. However, the circumferential shape of the separator may be the shape described above over the entire length along the central axis of the deflection yoke. Further, a part such as a part facing the large diameter part of the funnel may be merely formed in the above-described shape.

In the above embodiment, the deflection yoke in which the vertical deflection coil is a toroidal type has been described. However, the present invention can be applied to a deflection yoke in which the vertical deflection coil has a saddle type together with the horizontal deflection coil. It is.

[0022]

According to the present invention, there is provided a deflection yoke having a substantially cylindrical separator and a saddle type horizontal deflection coil which is arranged at least in contact with the inside of the separator and mainly generates a pincushion type horizontal deflection magnetic field. The circular arc shape in the inner circumferential direction of the portion in contact with the horizontal deflection coil matches the outer circumferential shape, and the inner circumferential shape in the vicinity of the vertical axis where the horizontal deflection coil does not contact the inner circumferential shape of the portion in contact with the horizontal deflection coil Direction is located outside the circumferential shape when extending to the vertical axis, and the inner circumferential shape near the vertical axis of the separator is an arc shape, and the inner circumferential shape near this vertical axis is The curvature of the arc shape is made larger than the curvature of the arc shape in the circumferential direction of the inner surface of the portion in contact with the horizontal deflection coil, and further, the horizontal deflection of the separator When a portion that is in contact with the horizontal deflection coil and a portion that has a different inner circumferential shape from the inner surface circumferential shape on the vertical axis side are interposed between the portion that contacts the vertical axis and the portion that contacts the vertical Can be prevented from contacting the outer surface of the funnel, the horizontal deflection coil can be held at a predetermined position, and the electrical insulation between the horizontal deflection coil and the vertical deflection coil can be prevented from being reduced. Further, the degree of freedom in designing the horizontal deflection coil is increased, and a desired deflection yoke can be formed.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a configuration of a deflection yoke for an in-line type color picture tube according to an embodiment of the present invention.

FIG. 2 is a sectional view showing a configuration of the deflection yoke.

FIG. 3 is a view for explaining a shape of a separator of the deflection yoke.

FIGS. 4A and 4B are diagrams for explaining shapes different from those of the separator.

5A is a diagram showing a configuration of an in-line color picture tube, and FIG. 5B is a diagram showing a configuration of a conventional deflection yoke mounted on the in-line color picture tube.

FIG. 6 is a sectional view showing a configuration of the conventional deflection yoke.

FIG. 7 is a diagram for explaining a problem when a pincushion-type magnetic field component generated by a horizontal deflection coil of the conventional deflection yoke is strengthened.

FIG. 8 is a diagram showing a configuration of a deflection yoke that solves the problem when the pincushion-type magnetic field component is strengthened.

[Explanation of symbols]

 Reference Signs List 20 separator 21 horizontal deflection coil 22 core 23 vertical deflection coil

Claims (3)

[Claims] 1. A deflection yoke comprising: a substantially cylindrical separator; and a saddle-type horizontal deflection coil which is disposed at least in contact with the inside of the separator and mainly generates a pincushion-type horizontal deflection magnetic field, wherein the separator comprises the horizontal The circular arc shape in the inner circumferential direction of the portion in contact with the deflection coil matches the outer circumferential shape of the horizontal deflection coil, and the inner circumferential shape near the vertical axis where the horizontal deflection coil does not contact the horizontal deflection coil The deflection yoke is located outside the circumferential shape when the circular arc shape of the inner surface circumferential direction of the portion to be extended is extended to the vertical axis. 2. The separator has an arcuate inner peripheral shape in the vicinity of the vertical axis, and has a circular arc shape in the inner peripheral direction in the vicinity of the vertical axis. 2. The deflection yoke according to claim 1, wherein the deflection yoke is larger than the curvature. 3. A separator is provided between a portion in contact with the horizontal deflection coil and a portion on the vertical axis side, a portion in contact with the horizontal deflection coil, and a portion having a different inner circumferential shape from the inner circumferential shape near the vertical axis. The deflection yoke according to claim 1, wherein