JPH0869763A - Deflection yoke and color cathode-ray tube mounted with it - Google Patents

Abstract

PURPOSE: To provide a deflection yoke which can sufficiently reduce the raster distortions of higher orders (gull wing) of higher order at the left and right of a screen plane without damaging the coil wire at a screen side flange when winding is performed to construct a vertical deflection coil. CONSTITUTION: A deflection yoke is composed of a horizontal deflection coil 1 wound in a saddle form, a saddle-form vertical deflection coil 2 furnished on the outside of the horizontal deflection coil 1, and a ferrite core 3 furnished on the outside of the vertical deflection coil 2. The screen side cone part 2a of the vertical deflection coil 2 is wound in the range of winding angle from 1 deg. to 80 deg. with reference to the vertical axis, in particular the wire winding distribution should be such that weighting is laid in the range 18 deg. to 30 deg.. The max. protrusive point 4 in the tube axis direction of the screen side cone part 2a of the vertical deflection coil 2 is located 20mm apart from the screen side foremost part 3a of the ferrite core 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflection yoke and a color cathode ray tube equipped with the deflection yoke.

[0002]

2. Description of the Related Art In a color cathode ray tube used for a display monitor in recent years, information is very often displayed in the peripheral portion of a screen surface as represented by windows. Therefore, it is required to enable fine image display in this portion. Raster distortion is one of the important factors that determine the image quality in the peripheral part of the screen surface, and the magnetic field distribution of the deflection yoke itself determines the quality of the raster surface. ing.

Generally, the vertical magnetic field distribution of a deflection yoke mounted on a color cathode ray tube for a display monitor has barrel distortion as a whole from the electron gun side to the screen side from the viewpoint of self-convergence. With such barrel distortion, the raster distortion on the left and right of the screen surface becomes a pincushion shape. Therefore, by supplying a correction current from the circuit side of the display monitor to the horizontal deflection coil, this distortion is reduced. Have been removed.

However, since this correction current usually has a waveform for correcting the secondary pincushion distortion, if the raster distortion on the left and right of the screen surface includes a gull wing, which is a high-order distortion, this correction current is generated. In some cases, the distortion cannot be completely removed. On the other hand, this gull wing severely degrades the visual image quality and must be avoided.

In Japanese Patent Publication No. 2-11973,
A method has been proposed in which a gull wing at the upper and lower ends of the screen surface is reduced by giving a concave shape to the central portion of the screen side flange portion of the horizontal deflection coil. Further, Japanese Patent Laid-Open No. 62-180936 proposes a method of reducing the gullwing at the upper and lower ends of the screen surface by making the screen side flange portion of the horizontal deflection coil into a polygonal shape.

Further, it can be easily inferred that the gullwing on the left and right of the screen surface can be reduced by applying these methods to the vertical deflection coil.

[0007]

However, according to the method disclosed in Japanese Patent Publication No. 2-11973, a coil wire rod is used in a pressing process in which a central portion of a screen side flange portion of a vertical deflection coil is provided with a concave shape. Is likely to be abnormally stretched and damaged. Further, if the concave shape is formed too deep, the concave shape abuts the cone portion of the horizontal deflection coil when the deflection yoke is assembled, which makes it difficult to form the concave shape sufficient to remove the gull wing. There is a problem above. Further, in the method disclosed in Japanese Patent Laid-Open No. 62-180936, there is a high possibility that the coil wire rod is abnormally deformed and damaged at the apex angle portion of the polygonal shape of the screen side flange portion of the vertical deflection coil. There is a manufacturing problem.

Generally, in the deflection yoke, a ferrite core is mounted to enhance the strength of the deflection magnetic field. At the same time, the ferrite core serves to mitigate the distortion of the magnetic field formed by the deflection coil itself (hereinafter referred to as "existence"). It also has a "core magnetic field effect"). Therefore, even if the distortion of the vertical magnetic field is controlled by the winding distribution of the deflection coil in order to minimize the deflection aberration, the distortion of the magnetic field is mitigated by the cored magnetic field effect of the ferrite core. There is a problem that the correction sensitivity decreases.

In order to solve the above-mentioned problems in the prior art, the present invention is a deflection capable of sufficiently reducing the gull wing in the left and right rasters without damaging the coil wire of the screen side flange when winding the vertical deflection coil. The purpose is to provide a yoke. It is another object of the present invention to provide a color cathode ray tube capable of sufficiently reducing the gull wing in the left and right rasters and improving the image quality.

[0010]

In order to achieve the above object, a deflection yoke according to the present invention has a saddle type horizontal deflection coil and a saddle type vertical deflection coil provided outside the saddle type horizontal deflection coil. And a core provided outside the saddle type vertical deflection coil, wherein the maximum projection point of the screen side cone of the vertical deflection coil in the tube axis direction is the tip of the core on the screen side. It is characterized in that it is located within a range of 10 mm or more and 60 mm or less from the part.

The structure of the color cathode ray tube according to the present invention includes a color cathode ray tube body having a glass panel, a glass funnel connected to the rear portion of the glass panel, and a rear portion of the color cathode ray tube body. Of the saddle type horizontal deflection coil, the saddle type vertical deflection coil provided outside the saddle type horizontal deflection coil, and the saddle type vertical deflection coil. A color cathode ray tube comprising a deflection yoke having at least an outer core, wherein a maximum projection point of a screen side cone portion of the vertical deflection coil in the tube axis direction is 10 mm from the screen side tip portion of the core. It is characterized in that it is located in the range of not less than 60 mm.

Further, in the structure of the deflection yoke of the present invention or the structure of the color cathode ray tube of the present invention, the screen side cone portion of the vertical deflection coil has a winding angle of 1 ° to 80 ° with respect to the vertical axis. It is preferable to have a winding distribution in which the winding angle is in the range of and the winding angle is in the range of 18 ° to 30 °.

[0013]

According to the structure of the deflection yoke of the present invention, the maximum projection point of the screen side cone of the vertical deflection coil in the tube axis direction is located within the range of 10 mm to 60 mm from the screen side tip of the core. As a result, the cored magnetic field effect of the core on the screen side cone of the vertical deflection coil can be reduced. Therefore, if the state of distortion of the vertical magnetic field distribution that minimizes the high-order raster distortion (gull wing) on the left and right of the screen surface can be realized, the gull wing can be effectively reduced. In addition, since the gull wing can be effectively reduced, the screen side flange of the vertical deflection coil does not have a concave shape, and the screen side flange of the vertical deflection coil does not have to have a polygonal shape. Can be As a result, it is possible to solve the manufacturing problem that the coil wire of the screen side flange is damaged when the vertical deflection coil is wound.

Further, according to the structure of the color cathode ray tube of the present invention, since the deflection yoke according to the structure of the present invention is used, the gull wing can be effectively reduced as described above. , The image quality can be improved.

Further, in the structure of the deflection yoke of the present invention or the structure of the color cathode ray tube of the present invention, the screen side cone portion of the vertical deflection coil has a winding angle of 1 ° to 80 ° with respect to the vertical axis. According to the preferred example of winding in a range and having a weighted winding distribution in the range of a winding angle of 18 ° to 30 °, high-order raster distortion (gullwing) on the left and right of the screen surface is minimized. The optimum state of distortion of the vertical magnetic field distribution can be easily realized. This is because the 4th-order pincushion distortion that causes the gullwing is from 1 ° to 1 ° of winding angle with reference to the vertical axis.
Since it is generated by the winding of the screen side cone of the vertical deflection coil wound in the range of 8 °, by relatively reducing the winding distribution in the range of 1 ° to 18 ° This is because it is possible to suppress the occurrence of gullwings by reducing the fourth-order pincushion distortion.

[0016]

EXAMPLES The present invention will be described in more detail below with reference to examples. <First Embodiment> FIG. 1 is a plan view showing an embodiment of the deflection yoke according to the present invention, and FIG. 2 is a sectional view taken along the line A--A of FIG. As shown in FIG. 1, the deflection yoke includes a horizontal deflection coil 1 wound in a saddle type, and a horizontal deflection coil 1
The saddle type vertical deflection coil 2 is provided outside the vertical deflection coil 2 and the ferrite core 3 is provided outside the vertical deflection coil 2.

The screen side cone portion 2a of the vertical deflection coil 2 is wound in a range of a winding angle of 1 ° to 80 ° with respect to the vertical axis, and particularly weighted in a range of winding angle of 18 ° to 30 °. Has a winding distribution in which is placed, and the maximum protrusion point 4 in the tube axis direction is located 20 mm from the screen side tip portion 3a of the ferrite core 3. Further, a screen side flange portion 5 is continuously formed from a maximum projection point 4 in the tube axis direction of the screen side cone portion 2a of the vertical deflection coil 2 as a starting point. As shown in FIG. 2, the screen side flange portion 5 of the vertical deflection coil 2 is wound so as to have a substantially arc shape.

The gull wing in the left and right rasters is caused by the distortion of the vertical magnetic field distribution in the vicinity of the screen side opening of the deflection yoke. In this deflection yoke, the distortion state of the vertical magnetic field distribution is set as shown by the solid line 6 in FIG. 3 in order to minimize the gull wing.
The distortion of the vertical magnetic field distribution generated by the gull wing is as shown by the broken line 7 in FIG. That is, the vertical magnetic field distribution indicated by the broken line 7 contains a fourth-order pincushion distortion. The fourth-order pincushion distortion is generated by the winding of the screen side cone portion 2a of the vertical deflection coil 2 wound in the range of the winding angle of 1 ° to 18 ° with respect to the vertical axis. Therefore, in the screen side cone portion 2a of the vertical deflection coil 2 of this embodiment,
Relatively, appropriate adjustments have been made in advance so as to reduce the winding distribution in the winding angle range of 1 ° to 18 ° and increase the winding distribution in the winding angle range of 18 ° to 30 °. As a result, the fourth-order pincushion distortion can be reduced, so that the state of distortion of the vertical magnetic field distribution that minimizes gullwing (solid line 6 in FIG. 3) can be realized.

However, when the ferrite core 3 is attached to the screen side cone portion 2a of the vertical deflection coil 2 in which the distortion state of the vertical magnetic field distribution is adjusted as described above, the vertical magnetic field distribution of the vertical magnetic field distribution is caused by the cored magnetic field effect of the ferrite core 3. Since the strain state is relaxed, the strain state (solid line 8 in FIG. 4) of the optimum vertical magnetic field distribution that minimizes gullwing changes to the state shown by the broken line 9 in FIG. As a result, proper gull wing correction cannot be performed. As described above, since the deflection aberration correction sensitivity due to the distortion of the magnetic field distribution is reduced by the cored magnetic field effect of the ferrite core 3, when the distortion of the magnetic field distribution is required to be precisely controlled, it is necessary to perform the correction without the ferrite core. Will be required.

FIG. 5 is a graph showing the relationship between the cored magnetic field effect of the ferrite core and the distance between the maximum projection point in the tube axis direction of the screen side cone of the vertical deflection coil and the screen side tip of the ferrite core. As is clear from FIG. 5, when the distance between the maximum protruding point 4 of the screen side cone portion 2a of the vertical deflection coil 2 in the tube axis direction and the screen side tip portion 3a of the ferrite core 3 becomes 10 mm or more,
It can be seen that the cored magnetic field effect is attenuated to 10% or less. Based on this, in the present embodiment, the distance between the maximum protruding point 4 of the screen side cone portion 2a of the vertical deflection coil 2 in the tube axis direction and the screen side tip portion 3a of the ferrite core 3 is set to 20 mm. As a result, the effect of the cored magnetic field of the ferrite core 3 on the screen side cone portion 2a of the vertical deflection coil 2 can be reduced, and thus the optimum vertical magnetic field distribution distortion state that minimizes gullwing (solid line 8 in FIG. 4). ) Can be realized.

As described above, the screen side cone portion 2a of the vertical deflection coil 2 has a winding angle of 1 ° with reference to the vertical axis.
To a winding angle of 80 °, especially a winding angle of 18 ° to 3 °
The winding distribution is weighted in the range of 0 °, and the maximum projection point 4 of the screen side cone portion 2a of the vertical deflection coil 2 in the tube axis direction is located 20 mm from the screen side tip portion 3a of the ferrite core 3. If it is located, the gull wing can be effectively reduced. As a result, the screen-side flange portion 5 of the vertical deflection coil 2 is provided with a concave shape, and the screen-side flange portion 5 of the vertical deflection coil 2 is not formed into a polygonal shape but is formed into a substantially arc shape as described above. Therefore, it is possible to solve the manufacturing problem that the coil wire of the screen side flange portion 5 is damaged when the vertical deflection coil 2 is wound.

In this embodiment, the screen side cone portion 2a of the vertical deflection coil 2 is wound in the range of a winding angle of 1 ° to 80 ° with respect to the vertical axis, and in particular, a winding angle of 1
Although the winding distribution is weighted in the range of 8 ° to 30 °, the winding distribution is not necessarily limited to this configuration, and if the state of distortion of the vertical magnetic field distribution that minimizes gullwing can be realized, There is no limit to the winding angle range.

Further, in this embodiment, the maximum projection point 4 in the tube axial direction of the screen side cone portion 2a of the vertical deflection coil 2 is set to the screen side tip portion 3a of the ferrite core 3.
However, the present invention is not limited to this position, and the same effect can be obtained if the ferrite core 3 is positioned within a range of 10 mm or more and 60 mm or less from the screen side tip portion 3a. it can.

<Second Embodiment> FIG. 6 is a plan view of a color cathode ray tube according to the present invention. As shown in FIG. 6, the color cathode ray tube body 10 includes a glass panel 11 and a glass funnel 12 connected to the rear portion of the glass panel 11, and an electron gun (not shown) is provided at the rear portion of the glass funnel 12. No) is provided. Further, on the outer periphery of the rear portion of the glass funnel 12, a horizontal deflection coil 1 wound in a saddle type, a saddle type vertical deflection coil 2 provided outside the horizontal deflection coil 1, and an outside of the vertical deflection coil 2 are provided. A deflection yoke composed of the ferrite core 3 is attached. The screen side cone portion 2a of the vertical deflection coil 2 has a winding angle of 1 ° to 80 ° with reference to the vertical axis.
And has a winding distribution weighted in the range of a winding angle of 18 ° to 30 °, and the maximum of the screen side cone portion 2a of the vertical deflection coil 2 in the tube axis direction. The protrusion point 4 is located 20 mm from the screen side tip portion 3 a of the ferrite core 3. Further, a screen side flange portion 5 is continuously formed from a maximum projection point 4 in the tube axis direction of the screen side cone portion 2a of the vertical deflection coil 2 as a starting point. In addition, the vertical deflection coil 2
The screen side flange portion 5 is wound so as to have a substantially arc shape. That is, in the color cathode ray tube of this embodiment, the deflection yoke having the structure shown in the first embodiment is used as the deflection yoke (see FIGS. 1 and 2). As described above, since the deflection yoke having the structure shown in the first embodiment is used, the optimum vertical magnetic field distribution that minimizes the high-order raster distortion (gull wing) on the left and right of the screen surface as described above is obtained. Since the distortion state can be easily realized, the image quality can be improved.

Also in this embodiment, the screen side cone portion 2a of the vertical deflection coil 2 is wound in the range of the winding angle of 1 ° to 80 ° with respect to the vertical axis.
Although the winding distribution is weighted in the range of 8 ° to 30 °, the winding distribution is not necessarily limited to this configuration, and if the state of distortion of the vertical magnetic field distribution that minimizes gullwing can be realized, There is no limit to the winding angle range.

Also in the present embodiment, the maximum protruding point 4 of the screen side cone portion 2a of the vertical deflection coil 2 in the tube axis direction is set to the screen side tip portion 3a of the ferrite core 3.
However, the present invention is not limited to this position, and the same effect can be obtained if the ferrite core 3 is positioned within a range of 10 mm or more and 60 mm or less from the screen side tip portion 3a. it can.

[0027]

As described above, according to the deflection yoke of the present invention, the maximum projection point in the tube axis direction of the screen side cone portion of the vertical deflection coil is set to 10 mm or more and 60 mm or less from the screen side tip portion of the core. By locating in the range, the cored magnetic field effect of the core on the screen side cone portion of the vertical deflection coil can be reduced.
Therefore, if the state of distortion of the vertical magnetic field distribution that minimizes the high-order raster distortion (gull wing) on the left and right of the screen surface can be realized, the gull wing can be effectively reduced. Further, since the gull wing can be effectively reduced, the screen side flange portion of the vertical deflection coil is not provided with a concave shape, or the screen side flange portion of the vertical deflection coil is not polygonal.
It can be generally arcuate. As a result, it is possible to solve the manufacturing problem that the coil wire of the screen side flange is damaged when the vertical deflection coil is wound.

Further, according to the color cathode ray tube of the present invention, by using the deflection yoke according to the structure of the present invention, the gull wing can be effectively reduced as described above. The quality can be improved.

Further, in the structure of the deflection yoke of the present invention or the structure of the color cathode ray tube of the present invention, the screen side cone portion of the vertical deflection coil has a winding angle of 1 ° to 80 ° with respect to the vertical axis. According to the preferred example of winding in a range and having a weighted winding distribution in the range of a winding angle of 18 ° to 30 °, high-order raster distortion (gullwing) on the left and right of the screen surface is minimized. The optimum state of distortion of the vertical magnetic field distribution can be easily realized. This is because the 4th-order pincushion distortion that causes the gullwing is from 1 ° to 1 ° of winding angle with reference to the vertical axis.
Since it is generated by the winding of the screen side cone of the vertical deflection coil wound in the range of 8 °, by relatively reducing the winding distribution in the range of 1 ° to 18 ° This is because it is possible to suppress the occurrence of gullwings by reducing the fourth-order pincushion distortion.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of a deflection yoke according to the present invention.

FIG. 2 is a cross-sectional view as seen from the direction AA of FIG.

FIG. 3 is a diagram for explaining a state of distortion of a vertical magnetic field distribution that minimizes gullwing and a state of vertical magnetic field distribution that causes gullwing.

FIG. 4 is a diagram for explaining a state of a vertical magnetic field distribution having no cored magnetic field effect and a state of a vertical magnetic field distribution having a cored magnetic field effect.

FIG. 5 is a diagram showing a relationship between a cored magnetic field effect of a ferrite core and a maximum projection point position in a tube axis direction of a screen side cone portion of a vertical deflection coil and a distance between a screen side tip portion of the ferrite core.

FIG. 6 is a plan view showing an embodiment of the color cathode ray tube according to the present invention.

[Explanation of symbols]

1 Saddle type horizontal deflection coil 2 Saddle type vertical deflection coil 2a Vertical deflection coil screen side cone portion 3 Ferrite core 3a Ferrite core screen side tip portion 4 Vertical deflection coil screen side cone portion maximum protruding point in the axial direction 5 Vertical Deflection coil screen side flange 6 Distortion state of vertical magnetic field distribution that minimizes gullwing 7 Distortion state of vertical magnetic field distribution that produces gullwing 8 Distortion state of optimum vertical magnetic field distribution that minimizes gullwing 9 Ferrite core State of vertical magnetic field distribution changed by cored magnetic field effect of 10 Color cathode ray tube body 11 Glass panel 12 Glass funnel

Claims (3)

[Claims] 1. A deflection comprising at least a saddle type horizontal deflection coil, a saddle type vertical deflection coil provided outside the saddle type horizontal deflection coil, and a core provided outside the saddle type vertical deflection coil. The maximum protruding point of the yoke in the tube axial direction of the screen side cone of the vertical deflection coil is 1 from the screen side tip of the core.
A deflection yoke which is located in a range of 0 mm or more and 60 mm or less. 2. A color cathode ray tube body having a glass panel, a glass funnel connected to the rear portion of the glass panel, an electron gun provided at the rear portion of the color cathode ray tube body, and a color cathode ray tube body. Deflection having at least a saddle-type horizontal deflection coil, a saddle-type vertical deflection coil provided outside the saddle-type horizontal deflection coil, and a core provided outside the saddle-type vertical deflection coil, which is disposed on the outer periphery of the rear portion. A color cathode ray tube having a yoke, wherein the maximum projection point of the screen side cone portion of the vertical deflection coil in the tube axis direction is located within a range of 10 mm or more and 60 mm or less from the screen side tip portion of the core. Is a color cathode ray tube. 3. The screen side cone portion of the vertical deflection coil is wound in a winding angle range of 1 ° to 80 ° with respect to the vertical axis, and weighted in a winding angle range of 18 ° to 30 °. 3. The deflection yoke according to claim 1 or the color cathode ray tube according to claim 2, which has a winding distribution in which is arranged.