JP2003272542A - Deflection yoke and color cathode-ray tube device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a deflection yoke capable of realizing good convergence quality without installing a separate correction unit. <P>SOLUTION: This deflection yoke sweeps an electron beam emitted from the neck side of a color cathode-ray tube in the horizontal direction and in the vertical direction by a horizontal deflection coil 24 and a vertical deflection coil. The curvature R2 of a bent root part 24c within an angle of 20° from the horizontal direction in the radial direction of the deflection coil 24 is set larger than the curvature R1 of the root part 24c within an angle of 70° from the vertical direction. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color cathode ray tube device such as a display device and a television receiver, and more particularly to a deflection yoke provided in the color cathode ray tube device.

[0002]

2. Description of the Related Art A color cathode ray tube apparatus is provided with a color cathode ray tube (color cathode ray tube) and a deflection yoke, and three electron beams emitted from an electron gun arranged at a neck portion of the color cathode ray tube are used to generate the color cathode ray tube. B (blue) provided on the inner surface of the screen of the funnel part of
The G (green) and R (red) phosphor screens are respectively colored to display an image.

The deflection yoke includes a core, a vertical deflection coil, a vertical separator, a horizontal deflection coil, and a horizontal separator, and is disposed between the funnel portion and the neck portion of the color cathode ray tube. And an R beam (electron beam for developing red color), a G beam (electron beam for developing green color), and a B beam emitted from an electron gun disposed in the neck portion of the color cathode ray tube by applying a current to the horizontal deflection coil. The beam (electron beam for blue color development) is deflected horizontally and vertically.

The vertical separator is arranged inside the core, and the vertical deflection coil is wound inside the vertical separator. Further, a horizontal separator is arranged inside the vertical deflection coil, and the horizontal deflection coil is wound inside the horizontal separator.

FIG. 5 is a sectional view of a horizontal deflection coil 124 wound around a horizontal separator 125 in a conventional deflection yoke. In the conventional horizontal deflection coil 124 shown in FIG. 5, 124a is a small-diameter side bend portion, 124b is a large-diameter side bend portion, and 124c (124cx, 124cu) is a root portion of the small-diameter side bend portion 124a (small-diameter side bend root portion). ). 5A is a sectional view taken along a horizontal plane including the z-axis and the x-axis, FIG. 5B is a sectional view taken along an inclined plane including the z-axis and the u-axis, and FIG. An enlarged view of the side bend root portion 24cx, (d) is an enlarged view of the small diameter side bend root portion 124cu in (b) above, and (e).
FIG. 4 is a cross-sectional view of a plane (a vertical plane including the x-axis, u-axis, and y-axis) that passes through the small-diameter side bend root portion 24c perpendicularly to the z-axis.

In the conventional horizontal deflection coil 124,
The curvatures of the small-diameter side bend roots 124cx and 124cu are the same R2 as shown in FIGS. 5C and 5D. As can be seen from FIG. 5E, the conventional horizontal deflection coil 124 has a horizontal separator 125 such that the curvature of the small-diameter side bend root portion 124c is the same R2 over the entire circumference of the small-diameter side bend portion 124a. It is wound around.

[0007]

However, the conventional deflection yoke described above has a problem regarding misconvergence described below. FIG. 6 is a diagram for explaining the misconvergence in the conventional deflection yoke. FIG. 6A is a horizontal deflection magnetic field generated by the conventional deflection yoke during right deflection,
(B) is the magnetic flux density generated by the conventional deflection yoke during right deflection, and (c) is the trajectory of the electron beam during right deflection.

In the above conventional deflection yoke, the horizontal deflection magnetic field becomes a pinning magnetic field as shown in FIG. 6A, and the G beam magnetic flux density is higher than the B beam and R beam magnetic flux density as shown in FIG. 6B. become weak. As a result, there is a problem that a misconvergence pattern in which the G beam is deviated from the B and R beams is generated on the phosphor screen of the color CRT as shown in FIG. 6C.

The demands for higher precision and higher quality of the color cathode ray tube device are increasing year by year, and in particular, the demand for improving the convergence quality is rapidly increasing. Therefore, in addition to the horizontal and vertical deflection coils of the deflection yoke,
A unit for convergence correction is provided to adjust the misconvergence pattern. Alternatively,
A magnet or the like is provided to adjust the misconvergence pattern.

However, in order to drive the convergence correction unit, a power source and a circuit different from those for driving the deflection yoke are required, so that there is a problem that the cost of the apparatus becomes high. In addition, adjustment work using a magnet or the like is difficult.

The present invention has been made in order to solve such a conventional problem, and an object of the present invention is to provide a deflection yoke which can realize good convergence quality without providing another correction unit. Is.

[0012]

A deflection yoke according to claim 1 of the present invention is a deflection device for scanning an electron beam emitted from a neck side of a color cathode ray tube in horizontal and vertical directions by a horizontal deflection coil and a vertical deflection coil. In the yoke, the curvature of the bend root of the horizontal deflection coil is locally changed within a predetermined radial angle range.

According to a second aspect of the present invention, in the deflection yoke according to the first aspect, the curvature of the bend root portion of the horizontal deflection coil on the small diameter side is locally changed.

According to a third aspect of the present invention, in the deflection yoke according to the second aspect, the curvature of the bend root portion within the angle of 20 ° in the radial direction from the horizontal direction is locally changed.

According to a fourth aspect of the present invention, in the deflection yoke according to the third aspect, the curvature of the bend root portion within an angle of 20 ° in the radial direction from the horizontal direction is smaller than the curvature of the bend root portion within an angle of 70 ° from the vertical direction. Is also enlarged.

A color cathode ray tube device according to a fifth aspect of the present invention includes the deflection yoke according to any one of the first to fourth aspects.

[0017]

1 is a block diagram of a color cathode ray tube device having a deflection yoke according to an embodiment of the present invention. In FIG. 1, 10 is a color cathode ray tube (color cathode ray tube), 10a is a funnel portion, 10b is a neck portion, 10
Reference numeral c is an electron gun, and 20 is a deflection yoke according to the embodiment of the present invention. The color cathode ray tube apparatus of FIG. 1 includes a color cathode ray tube 10 and a deflection yoke 20.

The color cathode ray tube 10 includes a funnel portion 1
0a, a neck portion 10b, and an electron gun 10c. An electron gun 10c is arranged on the neck portion 10b, and a deflection yoke 20 is arranged between the funnel portion 10a and the neck portion 10b.

The color cathode ray tube device shown in FIG.
Funnel part 1 with 3 electron beams emitted from c
The B (blue), G (green), and R (red) phosphor screens provided on the inner surface of the screen 0a are each made to develop a color, and an image is displayed.

FIG. 2 shows a deflection yoke 2 according to the embodiment of the present invention.
It is sectional drawing of 0. In FIG. 2, 21 is a core, 22 is a vertical deflection coil, 23 is a vertical separator, 24 is a horizontal deflection coil, and 25 is a horizontal separator. The sectional view of FIG. 2 is a sectional view taken along a plane passing through the z-axis which is the tube axis of the color CRT 10.

The deflection yoke 20 includes a core 21, a vertical deflection coil 22, a vertical separator 23, a horizontal deflection coil 24, and a horizontal separator 25. Core 21
A vertical separator 23 is disposed inside the vertical separator 23, and a vertical deflection coil 22 is provided inside the vertical separator 23.
Is wound in a saddle shape. Further, the vertical deflection coil 22
A horizontal separator 25 is provided inside the horizontal separator 25, and a horizontal deflection coil 24 is provided inside the horizontal separator 25.
Is wound in a saddle shape.

The deflection yoke 20 includes a vertical deflection coil 2
2 and a horizontal deflection coil 24, an electric current is caused to flow, and an electron gun 10c is provided on the neck portion 10b of the color cathode ray tube 10.
R beam (electron beam for red color development), G beam (electron beam for green color development), and B beam (electron beam for blue color development) emitted from are deflected in the horizontal and vertical directions.

The deflection yoke 20 is a color cathode ray tube 10.
Of the vertical deflection coil 22 and the horizontal deflection coil 2 along the curved surface from the funnel portion 10a to the neck portion 10b.
4 has a tapered shape so as to be arranged. Therefore, the vertical deflection coil 22 has a large diameter on the funnel portion 10a side and a small diameter on the neck 10b side.
The vertical separator 23 is wound in a saddle shape, and the horizontal deflection coil 24 also has a large diameter on the funnel portion 10a side.
A saddle-shaped horizontal separator 25 is wound around the horizontal separator 25 so that the neck 10b side has a small diameter.

FIG. 3 is a sectional view of the horizontal deflection coil 24 wound around the horizontal separator 25 in the deflection yoke 20. 3, the same components as those in FIG. 2 are denoted by the same reference numerals, and in the horizontal deflection coil 24 of FIG. 3, 24a is a small-diameter side bend portion, 24b is a large-diameter side bend portion, and 24c.
(24cx, 24cu) is a root portion of the small-diameter side bend portion 24a (small-diameter side bend root portion). 3A is a cross-sectional view taken along a horizontal plane including the z-axis and the x-axis, FIG. 3B is a cross-sectional view taken along an inclined plane including the z-axis and the u-axis, and FIG. An enlarged view of the side bend root portion 24cx, (d) is the small diameter side root portion 24 in (b) above.
An enlarged view of cu, (e) is a plane perpendicular to the z-axis and passing through the small-diameter side bend root 24c (vertical plane including the x-axis, u-axis, and y-axis)
FIG.

In the horizontal deflection coil 24 of this embodiment, the small-diameter side bend root portion 2 of the horizontal deflection coil 24 is used.
The curvature of 4 cu is R1 as in the conventional horizontal deflection coil 124 (see FIG. 5) as shown in FIG. 3 (d), but the curvature of the small-diameter side bend root 24cx is as shown in FIG. 3 (c). R2 (> R1) larger than that of the conventional horizontal deflection coil 124
It has become.

As can be seen from FIG. 3 (e), the horizontal deflection coil 24 of this embodiment has a small-diameter side bend root 24c within a range of an angle of 70 ° in the radial direction from the vertical direction (y-axis). The curvature becomes R1 which is the same as before, and the horizontal direction (x
R2 in which the curvature of the small-diameter side bend root portion 24c is larger than R1 in the range within 20 ° in the radial direction from the axis).
It is wound on the horizontal separator 25 so that it changes locally.

As described above, the curvature of the small-diameter side bend root portion 24c of the horizontal deflection coil 24 is locally changed within a predetermined radial angle range,
The horizontal deflection magnetic field that horizontally deflects the three electron beams emitted from the electron gun 10c can be changed to a pin magnetic field or a barrel magnetic field, and the magnetic field strength can be changed, so that the degree of freedom in adjusting the horizontal deflection magnetic field is increased. be able to. Therefore, if the angle range for locally changing the curvature of the small-diameter side bend root portion 24c and the value of the curvature are appropriately set, a good convergence quality can be realized over the entire screen only by the deflection yoke 20, and other convergence performances can be realized. There is no need to provide a correction unit.

FIG. 4 is a diagram for explaining the convergence in the deflection yoke 20 of the embodiment, (a) is a horizontal deflection magnetic field generated by the deflection yoke 20 during right deflection, (b) is a horizontal deflection magnetic field.
Is the magnetic flux density generated by the deflection yoke 20 during right deflection,
(C) is the trajectory of the electron beam during right deflection.

In the deflection yoke 20 of the embodiment, since the curvature of the small-diameter side bend root portion 24c of the horizontal deflection coil 24 is locally changed, the horizontal deflection magnetic field is generated as shown in FIG.
As shown in FIG. 4B, the magnetic flux density of the G beam becomes larger than that of the B beam and the R beam. As a result, on the phosphor screen of the color CRT, the G beam is most largely deflected and catches up with the B beam and the R beam as shown in FIG. 6C, and good convergence can be obtained.

As described above, according to the embodiment of the present invention, the small-diameter side bend root 24c of the horizontal deflection coil 24 is formed.
The curvature of is locally changed within a predetermined angle range in the radial direction, so that the degree of freedom in adjusting the horizontal deflection magnetic field can be widened, and good convergence quality can be achieved without providing another correction unit. it can. This makes it possible to realize an inexpensive color cathode ray tube device with good convergence quality.

Although the deflection yoke of the above-described embodiment has a structure in which the horizontal deflection coil is wound directly on the horizontal separator, the present invention provides windings provided on the large diameter side and the small diameter side of the horizontal separator, respectively. It is also applicable to a deflection yoke having a structure in which a horizontal deflection coil is wound around a die (winding guide).

[0032]

As described above, according to the deflection yoke of the present invention, the curvature of the bend root of the horizontal deflection coil is locally changed within a predetermined radial angle range. The degree of freedom in adjusting the horizontal deflection magnetic field can be widened, and good convergence quality can be achieved without providing another correction unit.

Further, according to the color cathode ray tube device of the present invention, there is an effect that an inexpensive color cathode ray tube device having good convergence quality can be realized.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a color cathode ray tube device provided with a deflection yoke according to an embodiment of the present invention.

FIG. 2 is a sectional view of a deflection yoke according to the embodiment of the present invention.

3 is a cross-sectional view of a horizontal deflection coil wound around a horizontal separator in the deflection yoke of FIG.

FIG. 4 is a diagram for explaining the convergence of the deflection yoke according to the embodiment of the present invention.

FIG. 5 is a sectional view of a horizontal deflection coil wound around a horizontal separator in a conventional deflection yoke.

FIG. 6 is a diagram for explaining misconvergence in a conventional deflection yoke.

[Explanation of symbols]

10 color CRT, 10a funnel part,
10b neck portion, 10c electron gun, 20 deflection yoke, 21 core, 22 vertical deflection coil, 23
Vertical separator, 24 Horizontal deflection coil, 24a
Small diameter side bend part, 24b Large diameter side bend part, 2
4c, 24cx, 24cu Small diameter side bend root,
25 Horizontal separator.

Claims (5)

[Claims] 1. A deflection yoke for scanning an electron beam emitted from a neck side of a color cathode ray tube in horizontal and vertical directions by a horizontal deflection coil and a vertical deflection coil, wherein a curvature of a bend root portion of the horizontal deflection coil is changed in a radial direction. The deflection yoke is characterized in that the deflection yoke is locally changed in a predetermined angle range. 2. The deflection yoke according to claim 1, wherein the curvature of the bend root portion on the small diameter side of the horizontal deflection coil is locally changed. 3. The deflection yoke according to claim 2, wherein the curvature of the bend root portion within an angle of 20 ° from the horizontal direction is changed locally. 4. The curvature of the bend root portion within an angle of 20 ° in the radial direction from the horizontal direction is made larger than the curvature of the bend root portion within an angle of 70 ° from the vertical direction. Deflection yoke. 5. A color cathode ray tube device comprising the deflection yoke according to any one of claims 1 to 4.