JP2969049B2 - 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. Raster distortion is one of the important factors that determine the image quality at the periphery of the screen surface, and the requirements for the raster distortion at the upper and lower edges of the screen surface, which determines the quality of the magnetic field distribution of the deflection yoke itself, are very severe. It has become.

Usually, the magnetic field distribution in the screen-side cone portion of a saddle-type coil used as a horizontal deflection coil has a strong pincushion distortion in order to remove the raster distortion at the upper and lower ends of the screen surface by the horizontal magnetic field distribution itself. have. However, if this contains a large amount of fourth-order pincushion distortion, higher-order vertical raster distortion called gullwing occurs. This gull wing severely degrades the visual image quality and must be avoided.

[0004] In order to respond to these requirements, Japanese Patent Publication No. 2-1
Japanese Patent Application Laid-Open No. 1973 proposes a method of reducing the gull wings at the upper and lower ends of the screen surface by providing a concave portion at the center of the screen-side flange portion of the horizontal deflection coil. Japanese Patent Application Laid-Open No. Sho 62-180936 proposes a method of reducing the gull wings at the upper and lower ends of the screen surface by making the screen-side flange portion of the horizontal deflection coil a polygonal 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. If the concave shape is formed too deep, the concave shape comes into contact with the funnel portion of the cathode ray tube when the deflection yoke is mounted on the cathode ray tube, so that it is difficult to form a concave shape sufficient to remove the gull wing. And design problems. In the method disclosed in Japanese Patent Application Laid-Open No. 62-180936, there is a high possibility that the coil wire is abnormally deformed and damaged at the vertex of the polygonal shape of the screen-side flange portion of the horizontal deflection coil. Manufacturing problems. By the way, in general, in the deflection yoke, a ferrite core is mounted to enhance the deflection magnetic field strength.
At the same time, the ferrite core also has a function of relaxing the distortion of the magnetic field formed by the deflection coil itself (hereinafter, referred to as a “core magnetic field effect”). Therefore, even if the distortion of the horizontal magnetic field is controlled by the winding distribution of the deflection coil to minimize the deflection aberration, the distortion of the magnetic field is reduced by the cored magnetic field effect of the ferrite core. There is a problem that the correction sensitivity is reduced.

In order to solve the above-mentioned problems in the prior art, the present invention provides a deflection yoke capable of sufficiently reducing the gull wing without damaging a coil wire of a screen side flange portion at the time of winding a horizontal deflection coil. The purpose is to do. It is another object of the present invention to provide a color cathode ray tube capable of sufficiently reducing gull wings and 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. And a core provided outside of the saddle-type vertical deflection coil, wherein the maximum projection point of the screen-side cone portion of the saddle-type horizontal deflection coil in the tube axis direction is the screen of the core. Compared to when located at the side tip
Cored magnetic field effect of the core is characterized that you position in a range less than 10%. In the configuration of the deflection yoke of the present invention, the maximum projection point in the tube axis direction of the screen-side cone portion of the saddle-type horizontal deflection coil is located within a range from 20 mm to 60 mm from the screen-side tip of the core. Is preferred.

[0008] Further , in the configuration of the deflection yoke of the present invention,
The screen-side cone of a saddle-type horizontal deflection coil
The part has a winding angle of 1 ° to 80 ° with respect to the horizontal axis.
And a winding angle of 18 ° to 30 °
It is preferred to have a discrete winding distribution.

[0009] 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 a 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 a saddle-type vertical deflection coil. a color cathode ray tube and a deflection yoke comprising at least a core provided outside the tube axis direction maximum protruding point of the screen side cone portion of the saddle-type horizontal deflection coil, scree of the core
Cored magnetic field of the core as compared to
Effect is characterized that you position in a range less than 10%.

[0010]

According to the configuration of the deflection yoke of the present invention, the screen-side cone portion of the saddle type horizontal deflection coil has a tube axis direction.
Position the maximum protrusion at the screen end of the core .
The cored magnetic field effect of the core is less than 10%
If it is possible to realize a state of distortion of the horizontal magnetic field distribution that minimizes higher-order raster distortion (gull wing) at the upper and lower ends of the screen surface by positioning the gull wing, the gull wing can be effectively reduced. . Also, since the gull wing can be effectively reduced, the screen-side flange portion of the horizontal deflection coil is not provided with a concave shape as in the related art, and the screen-side flange portion of the horizontal deflection coil is not made polygonal. , Can be formed in a substantially arc shape. As a result, it is possible to solve a manufacturing problem such as damaging the coil wire of the screen side flange portion at the time of winding the horizontal deflection coil.

In addition, the configuration of the deflection yoke of the present invention is
There are, screen side cone portion of the saddle-type horizontal deflection coil
The maximum protrusion point in the pipe axis direction is the tip of the core on the screen side.
Located within the range of 20 mm or more and 60 mm or less from the part
According to the preferred example, the screen of the horizontal deflection coil
To reduce the cored magnetic field effect of the core on the cone side
be able to. Further, in the configuration of the deflection yoke of the present invention,
The screen side cone of the saddle type horizontal deflection coil
The part has a winding angle of 1 ° to 80 ° with respect to the horizontal axis.
And a winding angle of 18 ° to 30 °
The preferred example of having a winding distribution
The optimal horizontal magnetic field distribution to minimize gull wings
The simple state can be easily realized. Because mo
The fourth-order pincushion distortion that causes lewing is
Winding with a winding angle of 1 ° to 18 ° based on the horizontal axis
To the winding of the screen side cone of the horizontal deflection coil
Therefore, the winding angle is relatively 1 °.
4th order by reducing the winding distribution in the range of 18 ° from
Gull wing by reducing pincushion distortion
It is because it can suppress.

Further, the structure of the color cathode ray tube of the present invention.
According to the present invention, the deflection yoke according to the configuration of the present invention is used.
That makes the gull wing effective as described above
To improve image quality.
Can be.

[0013]

EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples. <First Embodiment> FIG. 1 is a side view showing an embodiment of a deflection yoke according to the present invention, and FIG. 2 is a front view of the deflection yoke shown in FIG. 1 as viewed from a screen side. As shown in FIG. 1, the deflection yoke includes a horizontal deflection coil 1 wound in a saddle shape.
And a saddle-type vertical deflection coil 2 provided outside the horizontal deflection coil 1 and a ferrite core 3 provided outside the vertical deflection coil 2.

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

The gull wing, which is a high-order raster distortion at the upper and lower ends of the screen surface, is caused by distortion of the horizontal magnetic field distribution near the screen side opening of the deflection yoke. In the present deflection yoke, the state of the distortion of the horizontal magnetic field distribution is set as shown by a solid line 6 in FIG. 3 in order to minimize the gull wing. The state shown in FIG. That is, the horizontal magnetic field distribution indicated by the broken line 7 has 4
The following pincushion distortion is included. This fourth-order pincushion distortion is caused by a winding angle of 1 ° with respect to the horizontal axis.
This is generated by the winding of the screen-side cone portion 1a of the horizontal deflection coil 1 wound in a range of 18 ° to 18 °. Therefore, in the screen side cone portion 1a of the horizontal deflection coil 1 of the present embodiment, the winding distribution in the range of the winding angle of 1 ° to 18 ° is relatively reduced, and the winding angle of 18 ° to 30 ° is relatively reduced.
Appropriate adjustments have been made in advance to increase the winding distribution in the range of °. Thereby, the fourth-order pincushion distortion can be reduced, so that the distortion state (solid line 6 in FIG. 3) of the horizontal magnetic field distribution that minimizes the gull wing can be realized.

However, when the ferrite core 3 is mounted on the screen-side cone portion 1a of the horizontal deflection coil 1 in which the state of the distortion of the horizontal magnetic field distribution is adjusted as described above, the horizontal magnetic field distribution is reduced by the cored magnetic field effect of the ferrite core 3. Since the state of distortion is alleviated, the state of distortion (solid line 8 in FIG. 4) of the optimum horizontal magnetic field distribution for minimizing the gull wing 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 sensitivity of the deflection aberration correction due to the distortion of the horizontal magnetic field distribution is reduced due to the cored magnetic field effect of the ferrite core 3, when it is necessary to precisely control the state of the distortion of the horizontal magnetic field distribution, the ferrite core 3 It is necessary to do this in the absence of 3.

FIG. 5 is a diagram showing the relationship between the cored magnetic field effect of the ferrite core and the distance between the point of maximum projection of the screen-side cone of the horizontal deflection coil in the tube axis direction and the distance between the screen-side tip of the ferrite core. As is clear from FIG. 5, when the distance between the tube-side maximum protrusion point 4 of the screen-side cone portion 1 a of the horizontal deflection coil 1 and the screen-side tip portion 3 a of the ferrite core 3 becomes 20 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 projection point 4 of the screen-side cone portion 1a of the horizontal deflection coil 1 in the tube axis direction and the screen-side tip portion 3a of the ferrite core 3 is set to 30 mm. . As a result, the effect of the cored magnetic field of the ferrite core 3 on the screen side cone portion 1a of the horizontal deflection coil 1 can be reduced, so that the optimal horizontal magnetic field distribution distortion state that minimizes the gull wing (the broken line 9 in FIG. 4). ) Can be realized.

As described above, the screen-side cone portion 1a of the horizontal deflection coil 1 has a winding angle of 1 ° with respect to the horizontal axis.
To 80 °, and in particular, a winding angle of 18 ° to 3 °.
The winding distribution is weighted in a range of 0 °, and the maximum projecting point 4 of the screen-side cone portion 1a of the horizontal deflection coil 1 in the tube axis direction is located 30 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 horizontal deflection coil 1 is not given a concave shape as in the prior art, and the screen-side flange portion 5 of the horizontal deflection coil is not formed into a polygonal shape. Therefore, it is possible to solve a problem in manufacturing that the coil wire of the screen side flange portion 5 is damaged when the horizontal deflection coil 1 is wound.

In this embodiment, the screen-side cone portion 1a of the horizontal deflection coil 1 is wound in a winding angle range of 1 ° to 80 ° with respect to the horizontal axis.
Although the winding distribution is weighted in the range of 8 ° to 30 °, the present invention is not necessarily limited to this configuration. If a state of distortion of the horizontal magnetic field distribution that minimizes the gull wing can be realized, There is no limitation on the range of the winding angle.

In this embodiment, the maximum projecting point 4 of the screen-side cone portion 1a of the horizontal deflection coil 1 in the tube axis direction is set to the screen-side tip portion 3a of the ferrite core 3.
From the screen side tip 3a of the ferrite core 3, but the same effect can be obtained if the ferrite core 3 is positioned within a range of 20 mm or more and 60 mm or less. it can.

<Second Embodiment> FIG. 6 is a plan view showing an embodiment of a color cathode ray tube according to the present invention. As shown in FIG. 6, the color cathode ray tube main body 9 includes a glass panel 10.
And a glass funnel 11 connected to the rear of the glass panel 10.
An electron gun (not shown) is provided at the rear of 1. A horizontal deflection coil 1 wound in a saddle shape, a saddle type vertical deflection coil 2 provided outside the horizontal deflection coil 1, and a horizontal deflection coil 2 provided outside the vertical deflection coil 2 are provided on the rear outer periphery of the glass funnel 11. A deflection yoke including the ferrite core 3 is mounted. The screen side cone portion 1a of the horizontal deflection coil 1 is wound in a range of a winding angle of 1 ° to 80 ° with respect to the horizontal axis, and particularly, a winding angle of 18 °.
Has a winding distribution weighted in the range of 30 ° to 30 °. The maximum projection point 4 of the screen side cone portion 1a of the horizontal deflection coil 1 in the tube axis direction is the ferrite core 3
Is located 30 mm from the screen-side tip 3a. Further, a screen-side flange portion 5 is continuously formed starting from a maximum projecting point 4 of the screen-side cone portion 1a of the horizontal deflection coil 1 in the tube axis direction. Also,
The screen-side flange portion 5 of the horizontal deflection coil 1 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, an optimum horizontal magnetic field distribution for minimizing higher-order raster distortion (gull wing) at the upper and lower ends of the screen surface as described above is obtained. Since the state of the distortion can be easily realized, the image quality can be improved.

Also in this embodiment, the screen-side cone 1a of the horizontal deflection coil 1 is wound in the range of a winding angle of 1 ° to 80 ° with respect to the horizontal axis.
Although the winding distribution is weighted in the range of 8 ° to 30 °, the present invention is not necessarily limited to this configuration. If a state of distortion of the horizontal magnetic field distribution that minimizes the gull wing can be realized, There is no limitation on the range of the winding angle.

Also in this embodiment, the maximum projection point 4 of the screen-side cone portion 1a of the horizontal deflection coil 1 in the tube axis direction is set to the screen-side tip portion 3a of the ferrite core 3.
From the screen side tip 3a of the ferrite core 3, but the same effect can be obtained if the ferrite core 3 is positioned within a range of 20 mm or more and 60 mm or less. it can.

[0024]

As described in the foregoing, according to the deflection yoke according to the present invention, the saddle-type horizontal deflection coil the tube axis direction maximum protruding point of the screen side cone portion, subscription of the core
Cored core compared to the case where the core
If the field effect is located in a range where the field effect is 10% or less, it is possible to realize a state of horizontal magnetic field distribution distortion that minimizes higher-order raster distortion (gull wing) at the upper and lower ends of the screen surface. Can be effectively reduced. Also, since the gull wing can be effectively reduced, the screen-side flange portion of the horizontal deflection coil is not provided with a concave shape as in the related art, and the screen-side flange portion of the horizontal deflection coil is not made polygonal. , Can be formed in a substantially arc shape. As a result, it is possible to solve a manufacturing problem such as damaging the coil wire of the screen side flange portion at the time of winding the horizontal deflection coil.

[0025] In addition, your on the configuration of the deflection yoke of the present invention
There are, screen side cone portion of the saddle-type horizontal deflection coil
The maximum protrusion point in the pipe axis direction is the tip of the core on the screen side.
Located within the range of 20 mm or more and 60 mm or less from the part
According to the preferred example, the screen of the horizontal deflection coil
To reduce the cored magnetic field effect of the core on the cone side
be able to. Further, in the configuration of the deflection yoke of the present invention,
The screen side cone of the saddle type horizontal deflection coil
The part has a winding angle of 1 ° to 80 ° with respect to the horizontal axis.
And a winding angle of 18 ° to 30 °
The preferred example of having a winding distribution
The distortion of the horizontal magnetic field distribution that minimizes the gull wing
State can be easily realized. Because Garwi
The fourth-order pincushion distortion that causes
Wound with a winding angle of 1 ° to 18 ° based on
By the winding of the screen side cone part of the horizontal deflection coil
Since it occurs, the winding angle is relatively 1 ° to 1 °.
By reducing the winding distribution in the range of 8 °, the fourth order pin
Reduces cushion distortion and suppresses gull wings
Because it can be

According to the color cathode ray tube of the present invention,
For example, the deflection yoke according to the configuration of the present invention is used.
Effectively reduces gull wings as described above
To improve image quality.
Wear.

[Brief description of the drawings]

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

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

FIG. 3 is a diagram for explaining a state of distortion of a horizontal magnetic field distribution that minimizes a gull wing and a state of a horizontal magnetic field distribution that generates a gull wing.

FIG. 4 is a diagram for explaining a state of a horizontal magnetic field distribution without a cored magnetic field effect and a state of a horizontal magnetic field distribution subjected to a cored magnetic field effect.

FIG. 5 is a diagram showing the relationship between the cored magnetic field effect of the ferrite core and the maximum projecting point position in the axial direction of the cone portion on the horizontal saddle coil screen side-distance between the tip of the ferrite core screen side.

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

[Explanation of symbols]

Reference Signs List 1 saddle type horizontal deflection coil 1a screen side cone of horizontal deflection coil 2 saddle type vertical deflection coil 3 ferrite core 3a screen side tip of ferrite core 4 maximum projection point of screen side cone of horizontal deflection coil in tube axis direction 5 horizontal Screen side flange of deflection coil 6 State of distortion of horizontal magnetic field distribution that minimizes gull wing 7 State of distortion of horizontal magnetic field distribution that generates gull wing 8 State of distortion of optimal horizontal magnetic field distribution that minimizes gull wing 9 Ferrite core State of horizontal magnetic field distribution changed by cored magnetic field effect

──────────────────────────────────────────────────の Continuation of front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H01J 29/76 JICST file (JOIS)

Claims (4)

(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, a tube of a screen side cone portion of the saddle type horizontal deflection coil;
The maximum axial projection point is the screen-side tip of the core.
The cored magnetic field effect of the core is 1
Deflection yoke characterized that you position in a range equal to or less than 0%. 2. A screen side of a saddle type horizontal deflection coil.
The maximum protrusion point of the cone part in the pipe axis direction is
Position within the range of 20mm or more and 60mm or less from the front end
The deflection yoke according to claim 1, wherein 3. The screen-side cone portion of the saddle type horizontal deflection coil is wound around a winding angle of 1 ° to 80 ° with respect to the horizontal axis, and has a winding angle of 18 ° to 30 °. deflection yaw click of claim 1 having a winding distribution for placing the weight on. 4. A color cathode ray tube main body having a glass panel, a glass funnel connected to a rear part of the glass panel, an electron gun provided at a rear part of the color cathode ray tube main body, and a color cathode ray tube main body. A deflection having at least a saddle-type horizontal deflection coil disposed on a rear outer periphery, 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 color cathode-ray tube including a yoke, wherein a maximum axial projection point of a screen-side cone portion of the saddle-type horizontal deflection coil is located at a screen-side tip portion of the core.
Color cathode ray tube cored field effect of which is characterized that you position in a range less than 10%.