JP2004171810A - Color cathode-ray tube device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a color cathode-ray tube device that mounts a deflecting yoke for maintaining deflection efficiency in the conventional deflecting yoke and can reduce color drift on a screen. <P>SOLUTION: A horizontal deflection coil 12 is provided on an inner surface via an insulation frame (not illustrated), a saddle-type vertical deflection coil 13 is provided on an outer surface, and a ferrite core 14 is provided while covering the vertical deflection coil 13. Additionally, a bend section 15 at an electron gun side comprises first and second bend sections 15a and 15b projecting to the left and right, respectively while being viewed from the electron gun side of the horizontal deflection coil 12. The outside arc portion of the first bend section 15a is continuously connected with that of the second bend section 15b, and the outside arc portion at the boundary portion between the first and second bend sections 15a and 15b is formed nearly at the same height as the upper surface of the electron gun at a connecting section 17. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a color cathode ray tube device equipped with a deflection yoke having a bend.
[0002]
[Prior art]
In recent years, as television sets have become larger, there has been a strong demand for a reduction in the depth of a cathode ray tube, that is, a reduction in the overall length of the cathode ray tube. However, increasing the deflection angle of the cathode-ray tube increases the deflection angle of the deflection yoke, causing the deflection efficiency of the deflection yoke to deteriorate. On the other hand, from the viewpoint of environmental problems in recent years, there is a strong demand for energy saving of television sets, that is, improvement of deflection efficiency (particularly, horizontal deflection efficiency).
[0003]
A conventional bendless-type deflection yoke with improved horizontal deflection efficiency will be described with reference to FIG. FIG. 8 is a side view of a conventional bendless type deflection yoke. In this deflection yoke 101, a horizontal deflection coil 102 is disposed inside through an insulating frame (not shown), and a vertical deflection coil 103 is disposed outside thereof. The ferrite core 104 is provided outside the vertical deflection coil 103. The electron gun-side transition portion 105 of the horizontal deflection coil 102 has a configuration in which the transition portion 105 is bent toward the electron gun side in the tube axis (Z-axis) direction without providing a bent portion formed by bending the transition portion 105. With this configuration, the horizontal deflection coil is extended closer to the electron gun than the deflection yoke having the bend portion. Therefore, the deflection center can be moved to the electron gun side, so that the deflection efficiency can be improved. Incidentally, as an example, in the case of the bend-up type deflection yoke, the deflection efficiency was about 17.5 mHA ² , whereas in the case of the bendless type deflection yoke, the deflection efficiency was able to be about 16 mHA ² .
[0004]
[Patent Document 1]
JP-A-2002-117786 [0005]
[Problems to be solved by the invention]
However, the conventional color cathode ray tube device using the bendless deflection yoke has the following problems.
[0006]
In the deflection yoke, a convergence yoke 106 for correcting color misregistration at the center position of the screen is provided. However, in the conventional bendless deflection yoke, the horizontal deflection coil 102 is used as shown in FIG. It had to be attached to the outer periphery of the transition section 105. For this reason, the diameter of the convergence yoke 106 has to be increased, and the convergence yoke 106 has a structure away from the electron beam in the tube. Therefore, it is necessary to use a convergence yoke having a large magnetization amount in order to obtain a sufficient correction amount. In this case, a change in the amount of magnetization of the convergence yoke due to a rise in the temperature of the convergence yoke 106 during operation is large because the absolute value of the amount of magnetization is large. As shown in FIG. 9, there is a problem that color shift of a screen occurs due to color shift of a vertical line of red (R) and blue (R).
[0007]
The present invention has been made to solve these problems, and is equipped with a deflection yoke that maintains the deflection efficiency of a conventional deflection yoke, and is capable of reducing color misregistration on a screen. The purpose is to provide.
[0008]
[Means for Solving the Problems]
A deflection yoke according to the present invention includes a horizontal deflection coil having a transition portion and a bend formed on the electron gun side of the transition portion, a vertical deflection coil provided outside the horizontal deflection coil, and an outside of the vertical deflection coil. A color cathode ray tube device equipped with a deflection yoke provided with a ferrite core provided in the color cathode ray tube device, wherein the tube axis of the color cathode ray tube device provided with the deflection yoke is a Z axis, and passes through the Z axis and is perpendicular to the Z axis. The horizontal axis is the X axis, the vertical axis passing through the Z axis and perpendicular to the Z axis is the Y axis, the plane including the electron gun side end of the bend section is the XY plane, and the bend section is the electron gun. When viewed from the side, the bend portion has a protruding portion extending in a direction away from the Y-axis from the electron gun-side surface of the transfer portion and substantially parallel to the X-axis, and The bend from the outer end When heading along the outer arc toward the Y-axis, the length of the straight line connecting the Z-axis and the outer arc of the bend portion gradually decreases, and near the Y-axis, the Z-axis and the electron gun side of the transition portion It is characterized in that the distance becomes substantially equal to the distance connecting the surface.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a color cathode ray tube device according to an embodiment of the present invention will be described with reference to the drawings.
[0010]
First, a color cathode ray tube device according to an embodiment of the present invention will be described with reference to FIG. As shown in FIG. 7, a color cathode ray tube device 70 according to the present embodiment has a substantially rectangular glass panel 72 having a screen display unit 71, a funnel glass funnel 73 connected to the panel 72, and a glass funnel 73. It has a vacuum envelope consisting of a cylindrical glass neck 74 connected to the funnel 73. The deflection yoke 11 is mounted from the neck portion 74 side to the funnel 73 side, and the funnel 73 has a small diameter portion from a connection portion with the neck portion 74 to a position where the deflection yoke 11 is mounted, a so-called yoke portion 75. Having. On the inner surface of the panel 72, there is provided a phosphor screen 76 composed of a three-color phosphor layer in the form of a dot or a stripe that emits blue, green, and red light. A shadow mask 77 having a large number of electron beam passage holes is provided.
[0011]
An in-line type electron gun 79 for emitting three electron beams 78 is provided in the neck 74. The electron beam 78 is deflected in the horizontal and vertical directions by the horizontal and vertical deflection magnetic fields generated by the deflection yoke 11, and is horizontally and vertically scanned on the phosphor screen 76 via the shadow mask 77, thereby displaying a color image. .
[0012]
Next, a deflection yoke mounted on the color cathode ray tube according to the present embodiment will be described with reference to FIG.
[0013]
As shown in FIG. 1, a deflection yoke 11 mounted on a color cathode ray tube device according to the present embodiment has a saddle type horizontal deflection coil 12 on an inner surface of the insulating frame via an insulating frame (not shown). The saddle type vertical deflection coil 13 is provided on the outer surface of the insulating frame. A ferrite core 14 is provided outside the vertical deflection coil 13 so as to cover the vertical deflection coil 13. A bend 15 is formed on the electron gun side of the horizontal deflection coil 12.
[0014]
Next, a horizontal deflection coil of a deflection yoke of the color cathode ray tube device according to the present embodiment will be described with reference to FIG. As shown in FIG. 2, the horizontal deflection coil 12 includes a bend unit 15 on the electron gun side, a screen-side bend unit 16, and a transition unit 17 between the bend units 15 and 16.
[0015]
The bend unit 15 on the electron gun side includes a first bend unit 15a and a second bend unit 15b that protrude left and right. Further, the outer arc portions of the first bend portion 15a and the second bend portion 15b are connected seamlessly, and the outer arc portion of the boundary portion between the first bend portion 15a and the second bend portion 15b is a crossover portion. 17 is formed so as to have substantially the same height as the upper surface of the electron gun 17.
[0016]
Next, the configuration of the bend unit 15 will be described in more detail with reference to FIG. FIG. 3 is a view of the horizontal deflection coil of the horizontal deflection yoke according to the present embodiment as viewed from the electron gun side. The tube axis of the color cathode ray tube apparatus is the Z axis, the horizontal axis passing through the Z axis and perpendicular to the Z axis is the X axis, and the vertical axis passing through the Z axis and perpendicular to the Z axis is the Y axis. In addition, a plane including the electron gun side end of the bend portion when the horizontal deflection coil is viewed from the electron gun side is defined as an XY plane.
[0017]
As shown in FIG. 3, the first bend portion 15 a and the second bend portion 15 b that protrude left and right are in directions away from the Y-axis with respect to the electron gun-side surface of the transfer portion 17 and are substantially parallel to the X-axis. And a substantially arc portion 19 connected to the substantially straight portion 18. The substantially arc portions of the first bend portion 15a and the second bend portion 15b are aligned on the Y axis. It is connected. A gap 21 is formed in a portion surrounded by the substantially straight portion 18, the substantially circular arc portion 19, and the end 20 of the bridging portion 17 on the bend portion 15 side.
[0018]
When the length of a straight line connecting the outer arc 22 of the bend portion and the origin (X = 0, Y = 0) on the Z axis is X1, the substantially arc portion 19 is an outer arc end which is one end of the straight line. When 23 extends from the outermost end of the protruding portion along the arc toward the Y axis, X1 gradually decreases, and the X1 becomes the surface of the electron gun side (bend side) end of the transfer portion 17 near the Y axis. It is almost equal to the height R1.
[0019]
As described above, in the deflection yoke according to the present embodiment, since the Y component contributing to deflection is added by the structure of the bend portion 15, the horizontal deflection coil is extended to the electron gun side like a conventional bendless deflection yoke. Even if it is not necessary to adopt a structure for improving the deflection efficiency, it is possible to maintain the deflection efficiency substantially equal to that of the bendless type deflection yoke.
[0020]
Moreover, the deflection yoke according to the present embodiment does not have a structure in which the horizontal deflection coil is extended to the electron gun side, such as a bendless type deflection yoke in which a bend portion is tilted to the electron gun side. It is not necessary to attach the yoke to the outer periphery of the horizontal deflection coil 12. Therefore, it is possible to use a convergence yoke having a smaller diameter than that of the convergence yoke used for the bendless type deflection yoke, and thus it is possible to use a convergence yoke having a small amount of magnetization. Therefore, it is possible to reduce the change in the amount of magnetization due to the rise in the temperature of the convergence yoke during operation, and to reduce the color shift of the screen.
[0021]
Also, in the deflection yoke according to the present embodiment, since the bend portion 15 of the horizontal deflection coil is formed with the substantially linear portion 27 extending in the X-axis direction, a correction piece made of a magnetic material is provided near the bend portion 15. Thus, the color shift of the vertical line on the left and right of the screen can be sufficiently corrected. Hereinafter, the correction of the color shift of the vertical line on the left and right sides of the screen will be described with reference to FIG.
[0022]
As shown in FIG. 4, when the correction piece 24 is disposed near the bend 15 of the horizontal deflection coil, the deflection leakage magnetic field 25 generated from the substantially linear portion 27 is oriented in the Y-axis direction. The magnetic field lines 26 can be generated by being well magnetized. As a result, the electron beam can be efficiently moved in the horizontal direction, and the color shift of the vertical line on the left and right of the screen can be corrected efficiently.
[0023]
Although the air gap 21 is formed in the bend portion 15 of the horizontal deflection coil of the deflection yoke according to the present embodiment, a space need not be formed as shown in FIG. Further, the bend portion 15 of the horizontal deflection coil of the deflection yoke according to the present embodiment is bent in a direction perpendicular to the Z axis. However, as shown in FIG. The bend portion may be formed so as to be inclined with respect to the surface 28 perpendicular to the Z axis so as to be located on the screen side of the lower end portion. FIG. 5 is a diagram showing only the bend unit 15.
[0024]
Next, an experiment was conducted on the effect of the color cathode ray tube device according to the present embodiment, and the experimental result will be described.
[0025]
The color cathode ray tube device according to the present embodiment is a 22-inch color cathode ray tube device. As shown in FIG. 3, the deflection yoke mounted on the device is provided on the inner surface of the bend portion side end 20 of the crossing portion of the horizontal deflection coil. The radius R2 was set to 16 mm, the outer arc shape of the bend portion was set to 26 mm for the overhang distance L1 of the bend portion from the Y axis, and the distance L2 from the origin on the Y axis to the outer arc was set to 19 mm. A 22-inch color cathode-ray tube device having a conventional bendless-type deflection yoke is also used. The cross-sectional shape of the horizontal deflection coil has an inner surface radius R2 of 16 mm and an outer surface arc from the origin on the Y axis. The distance L2 to the portion was set to 19 mm. Further, the total length of the transition portion of the horizontal deflection coil is about 130 mm for the conventional bendless deflection yoke, and about 125 mm for the deflection yoke according to the present embodiment. A deflection yoke 5 mm longer on the electron gun side than that of the deflection yoke according to the present embodiment was used.
[0026]
As a result, the deflection efficiency of the deflection yoke of the present invention was about 16 mHA ² . Since the deflection efficiency of the conventional Bendoresu type deflection yoke was about 16mHA ^2, the deflection yoke according to the present invention was found to be maintained deflection efficiency comparable to conventional Bendoresu type deflection yoke. Also, while the conventional bendless deflection yoke is a convergence yoke having a diameter of 60 mm, the deflection yoke according to the present embodiment can use a convergence yoke having a diameter of 40 mm. The variation of the vertical line color shift Yh (FIG. 9) between R) and blue (B) could be reduced from 0.15 mm to 0.07 mm.
[0027]
In addition, the conventional bendless type deflection yoke and the deflection yoke according to the present embodiment use the same correction piece of a rectangular parallelepiped having a length (Y direction) of 30 mm, a width (X direction) of 5 mm, and a height (Z direction) of 5 mm. When the left and right vertical line color shift Yh (FIG. 9) is corrected, the maximum correction amount is 0.4 mm for the conventional bendless deflection yoke, whereas the deflection yoke according to the present embodiment is 1 mm. .1 mm, and it was found that the deflection yoke according to the present embodiment can greatly increase the correction amount for the vertical line color shift compared to the conventional bendless deflection yoke. Similar results were obtained by using a U-shaped correction piece extending 20 mm (cross section 5 (mm) × 5 (mm)) parallel to the Y axis from above and below the rectangular parallelepiped as the correction piece. .
[0028]
【The invention's effect】
The color cathode ray tube device according to the present invention has a structure of a horizontal deflection coil mounted on the color cathode ray tube device. Can be reduced. Further, by disposing the correction piece near the bend portion of the horizontal deflection coil, it is possible to efficiently correct the color shift of the vertical line.
[Brief description of the drawings]
FIG. 1 is an upper side view of a deflection yoke mounted on a color cathode ray tube device according to an embodiment of the present invention. FIG. 2 is a perspective view of a horizontal deflection coil of a deflection yoke mounted on a color cathode ray tube device according to an embodiment of the present invention. FIG. 3 is a view of the horizontal deflection coil of the deflection yoke according to the embodiment of the present invention as viewed from the electron gun side. FIG. 4 is a view in which a correction piece is arranged on the deflection yoke according to the embodiment of the present invention. FIG. 6 is a view showing a first modified example of a bend portion of the horizontal deflection coil of the deflection yoke according to the embodiment of the present invention. FIG. 6 is a diagram showing a second modified example of the bend portion of the horizontal deflection coil of the deflection yoke according to the embodiment of the present invention. FIG. 7 is a partially cutaway perspective view of a color cathode ray tube device according to an embodiment of the present invention. FIG. 8 is an upper side view of a conventional deflection yoke. FIG. Diagrams [Description of symbols]
DESCRIPTION OF SYMBOLS 11 Deflection yoke 12 Horizontal deflection coil 13 Vertical deflection coil 14 Ferrite core 15 Bend part 17 Transition part

Claims (2)

A horizontal deflection coil having a transition portion and a bend formed on the electron gun side of the transition portion, a vertical deflection coil provided outside the horizontal deflection coil, and a ferrite core provided outside the vertical deflection coil. A color cathode ray tube device equipped with a deflection yoke,
The tube axis of the color cathode ray tube device provided with the deflection yoke is defined as a Z-axis, a horizontal axis passing through the Z-axis and perpendicular to the Z-axis is defined as an X-axis, and passing through the Z-axis and perpendicular to the Z-axis. When the axis is the Y axis, and the plane including the electron gun side end of the bend portion is the XY plane, when the bend portion is viewed from the electron gun side,
The bend portion has a protruding portion extending in a direction away from the Y-axis from the electron gun-side surface of the transition portion and substantially parallel to the X-axis,
When going from the outermost end of the overhang portion to the Y axis along the outer arc of the bend portion, the length of a straight line connecting the Z axis and the outer arc of the bend portion gradually decreases, and the Y axis A color cathode ray tube device, wherein a distance between the Z axis and an electron gun side surface of the transition portion is substantially equal in the vicinity. 2. The color cathode ray tube device according to claim 1, wherein a magnetic material is provided near the bend portion.

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