JP3192326B2 - Deflection yoke and color cathode ray tube equipped with the deflection yoke - Google Patents

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 frequently displayed on a peripheral portion of a screen surface as represented by a window. For this reason, it is required that a fine image can be displayed in this portion.

[0003] Raster distortion is also one of the important factors that determine the image quality at the peripheral portion of the screen surface, and the requirement for raster distortion of the screen surface, which is affected by the magnetic field distribution of the deflection yoke itself, is very severe. It has become something. In particular, high-order raster distortions such as gull wings extremely degrade visual image quality, and it is necessary to avoid them.

[0004] In order to meet these demands, for example, Japanese Patent Publication No. 2-11973 discloses a method of reducing high-order raster distortion by providing a concave portion at the center of a screen-side flange portion of a horizontal deflection coil. Has been proposed. Further, Japanese Patent Publication No. 4-10174 proposes a method of reducing high-order raster distortion by making the screen-side flange portion of the horizontal deflection coil a trapezoidal shape.

[0005]

However, in the conventional method disclosed in Japanese Patent Publication No. 2-19773, in the pressing step of giving a concave shape to the central portion of the screen-side flange portion of the horizontal deflection coil, the coil wire material is used. Is likely to be abnormally stretched and damaged. Also, if the concave shape is formed too deep, the concave shape contacts the glass funnel portion of the cathode ray tube when the deflection yoke is mounted on the cathode ray tube, so a concave shape sufficient to remove high-order raster distortion is formed. There is a problem in manufacturing and design that it is difficult to perform. Further, in the method disclosed in Japanese Patent Publication No. Hei 4-10174, there is a high possibility that the coil wire is likely to be abnormally deformed and damaged at the trapezoidal apex of the screen side flange portion of the horizontal deflection coil. There is a problem.

In order to solve the above-mentioned problems in the prior art, the present invention does not damage the coil wire of the screen-side flange portion when winding the horizontal deflection coil, and also replaces the horizontal deflection coil with a glass funnel when the deflection yoke is mounted. It is an object of the present invention to provide a deflection yoke capable of sufficiently reducing high-order raster distortion without making contact with a portion. In addition, high-order raster distortion is sufficiently reduced,
An object of the present invention is to provide a color cathode ray tube capable of improving image quality.

[0007]

In order to achieve the above object, a deflection yoke according to the present invention comprises a saddle type horizontal deflection coil and a saddle type vertical deflection coil provided outside the saddle type horizontal deflection coil. A deflection yoke including at least a core provided outside the saddle-type vertical deflection coil, the deflection yoke being disposed on the most screen side of the saddle-type horizontal deflection coil and extending in a circumferential direction so as to surround a tube axis. the screen side flange portion formed by winding, between gap penetrates in its vertical direction, and the left and right ends are
A space portion is provided such that no gap, wherein the space portion has a shape extending in the left-right along the curved from the middle portion of the screen side flange portion.

[0008] The structure of the color cathode ray tube according to the present invention is provided on a color cathode ray tube main body having a glass panel, a glass funnel connected to a rear portion of the glass panel, and a rear portion of the color cathode ray tube main body. An electron gun, a saddle-type horizontal deflection coil disposed on the outer periphery of the rear portion of the color cathode ray tube main body, a saddle-type vertical deflection coil provided outside the saddle-type horizontal deflection coil, and an outer side of the saddle-type vertical deflection coil. A color cathode ray tube including a deflection yoke having at least a provided core, the color cathode ray tube being disposed at the most screen side of the saddle type horizontal deflection coil, and formed by being wound around the tube axis in the circumferential direction. the screen side flange portion, in the vertical direction
Wherein the gap between the through and the left and right ends is provided space portion so that there is no gap, the space portion is a shape extending in the left-right along the curved from the middle portion of the screen side flange portion And

[0009]

According to the configuration of the deflection yoke of the present invention, the screen-side flange portion, which is arranged at the most screen side of the saddle type horizontal deflection coil and is wound in the circumferential direction so as to surround the tube axis, between the gap is through to the up and down direction
And, and, space portions so that no gap is provided in the right and left ends, by this <br/> and a shape of the space portion extending in the right and left along the curved from the middle portion of the screen side flange portion Since there is no coil wire in this space, the strength of the magnetic field in the tube axis direction generated near the corner of the screen-side flange of the saddle type horizontal deflection coil can be reduced. As a result, when deflecting the electron beam to the screen corner of the color cathode ray tube,
Since the Lorentz force acting on the electron beam also becomes smaller,
Higher-order vertical raster distortion of the screen surface can be reduced. Also, since the screen side flange of the saddle type horizontal deflection coil does not have a concave shape or a trapezoidal shape as in the prior art, the coil wire of the screen side flange is damaged when winding the saddle type horizontal deflection coil. In addition, it is possible to avoid contact between the concave shape when the deflection yoke is mounted on the cathode ray tube and the glass funnel portion of the cathode ray tube.

Further, according to the structure of the color cathode ray tube of the present invention, the use of the deflection yoke according to the structure of the present invention reduces high-order vertical raster distortion on the screen surface as described above. Therefore, image quality can be improved.

[0011]

EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples. Generally, the magnetic field on the screen side of the deflection yoke has a very high sensitivity for controlling raster distortion with respect to the magnetic field on the electron gun side. Therefore, for example, it is extremely effective to control the raster distortion by the magnetic field generated by the screen side flange of the saddle type coil.

As shown in FIG. 5, when deflecting the electron beam to the screen corner of the color cathode ray tube,
A magnetic field 3 in the tube axis direction is generated near the corner 2 of the screen side flange 1 of the saddle type horizontal deflection coil, and a Lorentz force 4 acts on the electron beam. The present invention has been made by paying attention to a magnetic field 3 generated in the vicinity of the corner portion 2 of the screen side flange portion 1 in the tube axis direction. That is, by providing a space in the screen side flange portion 1 of the saddle type horizontal deflection coil so that a gap penetrates in the vertical direction, the magnetic field strength of the magnetic field 3 in the tube axis direction is weakened, and the high order of the screen surface is reduced. This makes it possible to reduce raster distortion.

Hereinafter, the present invention will be described in more detail with reference to specific examples. <First Embodiment> FIG. 1 is a plan view showing an embodiment of a deflection yoke according to the present invention, and FIG. 2 is a view of the deflection yoke shown in FIG. 1 as viewed from a screen side. As shown in FIG. 1, the deflection yoke comprises a horizontal deflection coil 13 wound in a saddle shape,
It comprises a saddle type vertical deflection coil 14 provided outside the horizontal deflection coil 13 and a ferrite core 15 provided outside the vertical deflection coil 14.

The screen-side flange portion 5 of the horizontal deflection coil 13 has a maximum external dimension a in the tube axis direction (z-axis direction) of 2
0 mm, maximum outer dimension b in the horizontal direction (x-axis direction) is 12
0 mm, and the external shape when viewed from the screen side is substantially an arc shape (FIG. 2). Further, a space portion 6 is formed in the screen-side flange portion 5 of the horizontal deflection coil 13 so that a gap penetrates in the vertical direction. Here, the space portion 6 has a maximum dimension c of 5 in the pipe axis direction.
mm, and the maximum dimension d in the horizontal direction is set to be 80 mm.

In FIG. 1, a broken line 7 shows the conventional shape of the screen-side flange portion of the horizontal deflection coil. Its outer shape is substantially the same as that of the screen-side flange portion 5 of the present embodiment, but differs in that no space is formed so that a gap penetrates vertically.

As shown in FIG. 2, when deflecting the electron beam to the screen corner of the color cathode ray tube,
A magnetic field 10 in the tube axis direction is generated near the corner 9 of the screen-side flange 5 of the horizontal deflection coil 13, and a Lorentz force 11 acts on the electron beam. When the screen-side flange portion of the horizontal deflection coil has the above-described conventional shape, the magnetic field strength of the magnetic field 10 is very strong.
The Lorentz force 11 acting on the electron beam also increases.
Therefore, as shown in FIG. 3, high-order raster distortions 12 occur above and below the screen surface. The amount of this distortion e is 5
0.1 cm in a 1 cm (21 ")-90 ° color cathode ray tube.
7 mm, which extremely reduces image quality.

On the other hand, if a space portion 6 is formed in the screen-side flange portion 5 of the horizontal deflection coil 13 so that a gap penetrates in the vertical direction as in this embodiment, the space portion 6 has Since there is no coil wire, the magnetic field intensity of the magnetic field 10 in the tube axis direction generated near the corner 9 of the screen-side flange 5 of the horizontal deflection coil 13 is weakened. As a result, the Lorentz force 11 acting on the electron beam is also reduced, so that higher-order vertical raster distortion 12 on the screen surface shown in FIG. 3 can be reduced.

The maximum dimension c of the space portion 6 in the tube axis direction is 5 m
m, and the relationship between the maximum horizontal dimension d of the space portion 6 and the amount of higher-order distortion e of the upper and lower rasters of the screen surface was examined using a 51 cm (21 ")-90 ° color cathode ray tube. The results are shown in Fig. 4. As is clear from Fig. 4,
It can be seen that when the maximum dimension d in the horizontal direction is 80 mm, the amount e of higher-order vertical raster distortion on the screen surface becomes zero. That is, when viewed from the screen side, the outer shape is substantially circular, the maximum outer dimension a in the tube axis direction is 20 mm,
A space portion 6 is formed in the screen-side flange portion 5 of the horizontal deflection coil 13 having the maximum outer dimension b in the horizontal direction of 120 mm so that a gap penetrates in the vertical direction.
If the maximum dimension c in the tube axis direction is set to 5 mm and the maximum dimension d in the horizontal direction is set to 80 mm, 51 cm (21 ″) − 90
° It is possible to eliminate high-order vertical raster distortion of the screen surface in a color cathode ray tube.

In the present embodiment, the outer shape of the screen-side flange portion 5 of the horizontal deflection coil 13 when viewed from the screen side is substantially arc-shaped, but is not necessarily limited to this shape. . Further, the maximum dimension a in the tube axis direction, the maximum outer dimension b in the horizontal direction, and the dimension c in the tube axis direction and the horizontal dimension d of the space portion 6 of the screen-side flange portion 5 of the horizontal deflection coil 13 are also shown in this embodiment. It is not limited to a value. That is, the point of the present invention is to form a space portion 6 in the screen-side flange portion 5 of the horizontal deflection coil 13 such that a gap penetrates in the vertical direction.

<Second Embodiment> FIG. 6 is a plan view showing a color cathode ray tube according to the present invention. As shown in FIG. 6, the color cathode ray tube main body 16 includes a glass panel section 17 and a glass funnel section 18 connected to a rear portion of the glass panel section 17.
An electron gun (not shown) is provided at the rear of the camera. A saddle-shaped horizontal deflection coil 13 and a horizontal deflection coil 1
3, a saddle type vertical deflection coil 14 provided outside
A deflection yoke including a ferrite core 15 provided outside the vertical deflection coil 14 is mounted. The screen-side flange portion 5 of the horizontal deflection coil 13 has a maximum outer dimension a of 20 mm in the tube axis direction (z-axis direction) and a maximum outer dimension b of 120 mm in the horizontal direction (x-axis direction), as viewed from the screen side. The outer shape at this time is substantially an arc shape. Further, a space portion 6 is formed in the screen-side flange portion 5 of the horizontal deflection coil 13 so that a gap penetrates in the vertical direction. Here, the space portion 6
The maximum dimension c in the tube axis direction is 5 mm, the maximum dimension d in the horizontal direction
Is set to be 80 mm. 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, it is possible to obtain a good linear shape without high-order vertical raster distortion of the screen surface as described above. And image quality can be improved.

In this embodiment, the outer shape of the screen-side flange portion 5 of the horizontal deflection coil 13 when viewed from the screen side is substantially arc-shaped, but is not necessarily limited to this shape. . Further, the maximum dimension a in the tube axis direction, the maximum outer dimension b in the horizontal direction, and the dimension c in the tube axis direction and the horizontal dimension d of the space portion 6 of the screen-side flange portion 5 of the horizontal deflection coil 13 are also shown in this embodiment. It is not limited to a value.

[0022]

As described above, according to the deflection yoke according to the present invention, the deflection yoke is arranged at the most screen side of the saddle-type horizontal deflection coil and is formed by being wound around the tube axis in the circumferential direction. the screen side flange portion, through the inter-gap in the vertical direction, and a space portion in the gap is not <br/> so provided on the right and left ends, said space portion from the center portion of the screen side flange portion by the a shape extending in the left-right along the curved, because this is the space portion does not exist coil wire, saddle-type horizontal deflection coil on the screen side flange portion corner portion of the magnetic field in the tube axis direction generated in the vicinity of the The magnetic field strength can be reduced. As a result, when deflecting the electron beam to the screen corner of the color cathode ray tube, the Lorentz force acting on the electron beam is also reduced, so that higher-order vertical raster distortion on the screen surface can be reduced. Also, since the screen side flange of the saddle type horizontal deflection coil does not have a concave shape or a trapezoidal shape as in the prior art, the coil wire of the screen side flange is damaged when winding the saddle type horizontal deflection coil. In addition, it is possible to avoid contact between the concave shape when the deflection yoke is mounted on the cathode ray tube and the glass funnel portion of the cathode ray tube.

Further, according to the color cathode ray tube of the present invention, the use of the deflection yoke according to the configuration of the present invention reduces high-order vertical raster distortion of the screen surface as described above. Therefore, image quality can be improved.

[Brief description of the drawings]

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

FIG. 2 is a view of a deflection yoke shown in FIG. 1 as viewed from a screen side.

FIG. 3 is a diagram illustrating high-order vertical raster distortion of a screen surface.

FIG. 4 is a diagram showing the relationship between the maximum horizontal dimension of a space portion and the amount of higher-order distortion of upper and lower rasters on a screen surface.

FIG. 5 shows the magnetic field in the tube axis direction generated near the corner of the screen-side flange of the horizontal deflection coil and the Lorentz force acting on the electron beam when the electron beam is deflected to the screen corner of the color cathode ray tube. It is a figure for explaining.

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

[Explanation of symbols]

1, 5 Screen-side flange of saddle-type horizontal deflection coil 2, 9 Corner of screen-side flange of saddle-type horizontal deflection coil 3, 10 Magnetic field in tube axis direction 4, 11 Lorentz force 6 Screen of saddle-type horizontal deflection coil A space through which a gap penetrates in the vertical direction of the side flange 7 Screen-side flange of a conventional saddle-type horizontal deflection coil 12 Higher-order distortion of the upper and lower rasters of the screen surface 13 Saddle-type horizontal deflection coil 14 Saddle-type vertical deflection coil 15 Ferrite core a Maximum external dimension of the horizontal saddle coil on the screen side flange part in the tube axis direction b Maximum maximum external dimension of the horizontal saddle coil on the screen side flange part c Maximum dimension of the space part in the tube axis direction d Horizontal of the space part Maximum dimension in the direction e The amount of higher-order distortion of the upper and lower rasters on the screen

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01J 29/76

Claims (2)

(57) [Claims] 1. A deflection system 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. a yoke, said disposed closest to the screen side of the saddle-type horizontal deflection coils, on the screen side flange portion formed by winding in the circumferential direction so as to surround the tube axis, between gap penetrates to the vertical direction and a space portion provided so there is no gap in the right and left ends, Oh in shape the space portion extending in the right and left along the curved from the middle portion of the screen side flange portion
Deflection yoke, characterized in that that. 2. A color cathode ray tube main body having a glass panel, a glass funnel connected to a rear portion of the glass panel, an electron gun provided at a rear portion of the color cathode ray tube main body, and a color cathode ray tube main body. A saddle-type horizontal deflection coil arranged on the rear outer periphery, a saddle-type vertical deflection coil provided outside the saddle-type horizontal deflection coil, and a deflection yoke having at least a core provided outside the saddle-type vertical deflection coil. a color cathode ray tube having, disposed closest to the screen side of the saddle-type horizontal deflection coils, on the screen side flange portion formed by winding to the circumferential direction thereof so as to surround the tube axis, gap in the vertical direction during penetrates, and is due <br/> urchin space portion is no gap provided in the right and left ends, wherein the space portion is the screen side flange portion Color cathode ray tube, characterized in that the central portion is a shape extending in the left-right along the curvature.