JPH10223155A - Deflection yoke - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve deflection efficiency by reducing the inner diameter of a core without having a harmful influence, such as difficult control of the winding position of a vertical deflection coil. SOLUTION: A vertical separator 4 of a vertical deflection coil 2 is formed only at a part on its circumference. The vertical separator 4 is not formed in the vicinity of an X-axis end, where the total sum of products per the unit angle of a horizontal deflection coil 3 and the vertical deflection coil 2 is large. As a result, it is possible to reduce the inner diameter of a core 1. The inner surface of the core 1 is formed so as to leave the inner surface of the core 1 more as it goes farther away from the X-axis end, and in order to leave the inner surface of the core 1 at a maximum at a Y-axis end. As a result, it is possible to bring the vertical deflection coil 2 into close contact with the horizontal separator 5, even if the circular core 1 is used. A rib can be formed at the inner surface of the vertical separator 4. It is thus possible to control the winding position of the vertical deflection coil 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflection yoke suitable for use in a cathode ray tube device of a television receiver. Specifically, by providing a separator for the vertical deflection coil only on a part of the circumference, the inner diameter of the core is reduced without adverse effects such as the restriction of the winding position of the vertical deflection coil being impossible, and the deflection efficiency is improved. And a deflection yoke.

[0002]

2. Description of the Related Art FIG. 5 shows a conventional cathode ray tube device. This cathode ray tube (CRT: Cathode-Ray Tube) 50
Is composed of a funnel 50b and a neck 50a, and a deflection yoke 60 is disposed in the funnel 50b.

The deflection yoke 60 is configured by winding a vertical deflection coil and a horizontal deflection coil around a core. For example, each coil is wound in a saddle shape. As is well known, a sawtooth current of a horizontal deflection cycle flows through the horizontal deflection coil, and a sawtooth current of the vertical deflection cycle flows through the vertical deflection coil, and the electron gun ( R (red), G (green), B from not shown)
The (blue) electron beam is deflected up, down, left, and right.

By the way, television sets, computers,
In order to save power in displays and the like, it is required to improve the deflection efficiency of the deflection yoke 60. In addition, the deflection frequency tends to increase year by year due to the demand for higher definition, and the temperature of the deflection yoke 60 tends to increase significantly. As a countermeasure, it is necessary to improve the deflection efficiency.

For this reason, various methods have conventionally been proposed for improving the deflection efficiency by bringing the deflection magnetic field closer to the beam orbit (the glass outer surface of the cathode ray tube).

FIG. 6 shows a configuration of a conventional deflection yoke 60. This figure shows a cross section (x-
(y-plane).

In the deflection yoke 60, a separator 51 for a vertical deflection coil (hereinafter referred to as a "vertical separator") and a separator 53 for a horizontal deflection coil (hereinafter referred to as a "horizontal separator") 53 are sequentially provided on the inner surface side of a circular core 56. Are arranged. A horizontal deflection coil 54 is wound around the horizontal separator 53 in a saddle shape.
, A vertical deflection coil 52 is wound in a saddle shape.

Here, the horizontal deflection coil 54 has a large number of coils wound around the x-axis end and a small number of coils at the y-axis end so as to generate a pincushion magnetic field for correcting convergence characteristics and image distortion characteristics. Here, the horizontal separator 53 is constituted by an arc eccentric in the y-axis direction or a plurality of arcs in contact with the arc. As a result, the horizontal deflection coil 54 can be made closer to the beam trajectory, and the deflection efficiency of the horizontal deflection coil 54 is improved.

In addition to the deflection yoke 60 shown in FIG. 6, a deflection yoke 60a as shown in FIG. 7 has been proposed.

The deflection yoke 60a has a circular core 56.
On the inner surface side of a, a vertical separator 51a and a horizontal separator 53a, which are constituted by arcs eccentric in the y-axis direction, are arranged in order. A horizontal deflection coil 54a is wound around the horizontal separator 53a in a saddle shape, and a vertical deflection coil 52a is wound around the vertical separator 51 in a saddle shape. The core 5 is provided on the outer surface of the vertical separator 51a.
A rib 57a for positioning the 6a is provided.

In the deflection yoke 60a, since the vertical separator 51a is constituted by an arc decentered in the y-axis direction, the vertical deflection coil 52a can be made closer to the beam orbit, and the deflection efficiency of the vertical deflection coil 52a is reduced. Has been enhanced.

A deflection yoke 60b as shown in FIG. 8 has been proposed for the deflection yoke 60 as shown in FIG.

The deflection yoke 60b has a circular core 56.
A horizontal separator 53b is arranged on the inner surface side of b.
The horizontal separator 53b includes a horizontal deflection coil 54.
b is wound in a saddle shape, and the vertical deflection coil 52b is wound in a saddle shape directly on the core 56b. In this case, a gap 58 is formed near the y-axis end of the vertical deflection coil 52b and the horizontal separator 53b.

In the deflection yoke 60b, since the vertical deflection coil 52b is wound directly around the core 56b, the inner diameter of the core 56b can be reduced by the thickness of the vertical separator 51 in FIG. Thereby, the deflection efficiency of the vertical deflection coil 54b and the horizontal deflection coil 54b is enhanced.

A deflection yoke 60c as shown in FIG. 9 has been proposed for the deflection yoke 60 as shown in FIG.

In the deflection yoke 60c, a horizontal separator 53c is arranged on the inner surface side of a core 56c eccentric in the y-axis direction. A horizontal deflection coil 54c is wound around the horizontal separator 53c in a saddle shape.
2c is wound directly around the core 56c in a saddle shape.

In the deflection yoke 60c, the core 5
The gap 6c is eccentric in the y-axis direction by the gap 58 shown in FIG. 8, and the inner diameter of the core 56c is reduced in the y-axis direction by the gap 58. Thereby, the deflection efficiency of the vertical deflection coil 54c and the horizontal deflection coil 54c is increased.

[0018]

The deflection yoke 60a shown in FIG. 7 has a vertical separator 51a eccentric in the y-axis direction.
, The deflection efficiency of the vertical deflection coil 52a is improved, but the deflection efficiency of the horizontal deflection coil 54a is the same as that of the deflection yoke 60 shown in FIG. Further, in the deflection yoke 60b shown in FIG. 8, since the inner diameter of the core 56b can be reduced, the deflection efficiency of the vertical deflection coil 52b and the horizontal deflection coil 54b is improved as compared with the deflection yoke 60 shown in FIG. However, a gap 5 is provided inside the vertical deflection coil 52b.
8, the vertical deflection coil 52b
Has room to be closer to the beam trajectory. Further, since there is no rib on the inner surface side of the core 56, the position of the wire rod can be restricted only on the neck portion side and the funnel portion side of the core 56b, which causes a variation in the magnetic field distribution at the crossover portion.

In the deflection yoke 60c shown in FIG.
Since the core 56c is eccentric in the y-axis direction, the effect of improving the deflection efficiency is large. However, the variation in firing of the core 56c becomes large, polishing becomes difficult, and the cost increases. In addition, since there is no rib on the inner surface side of the core 56c, the wire position is changed to the neck portion side and the funnel portion side of the core 56c. And the distribution of the magnetic field at the transitional portion varies.

In view of the above, the present invention provides a deflection yoke in which the inner diameter of the core is reduced and the deflection efficiency is improved without the disadvantage that the winding position of the vertical deflection coil cannot be regulated. .

[0021]

In a deflection yoke according to the present invention, a first separator for a vertical deflection coil and a second separator for a horizontal deflection coil are sequentially disposed on the inner surface side of a circular core. Is provided only on a part of the circumference, the horizontal deflection coil is wound around the second separator in a saddle shape, and the vertical deflection coil is wound around the first separator on the circumference where the first separator is located. And on the circumference without the first separator, directly wound around the core.

In the present invention, the first separator for the vertical deflection coil is provided only on a part of the circumference.
For example, near the x-axis end where the sum of linear products per unit angle of the horizontal deflection coil and the vertical deflection coil becomes large, the first
Is not provided. The inner diameter of the core is regulated by the product of the horizontal and vertical deflection coils and the thickness of each separator, but as described above, by not providing the first separator at the x-axis end where the sum of the product becomes larger, It is possible to reduce the inner diameter.

The inner surface of the vertical separator is, for example,
The distance from the inner surface of the core increases as the distance from the x-axis end increases, and the distance from the inner surface of the core increases at the y-axis end. Thus, even if a circular core is used, the vertical deflection coil can be brought into close contact with the horizontal deflection coil separator. For example, ribs are formed on the inner surface of the vertical separator. This makes it possible to regulate the winding position of the vertical deflection coil.

[0024]

FIG. 1 shows a cathode ray tube device as an embodiment. This cathode ray tube (CRT: Catod)
e-Ray Tube) 10 has a funnel 10b and a neck 1
0a, and the deflection yoke 2 is attached to the funnel 10b.
0 is arranged.

The deflection yoke 20 is constructed by winding a vertical deflection coil and a horizontal deflection coil around a core. For example, each coil is wound in a saddle shape. As is well known, a sawtooth current having a horizontal deflection cycle flows through the horizontal deflection coil 3 and a sawtooth current having a vertical deflection cycle flows through the vertical deflection coil 2. R (red), G (green), B from a gun (not shown)
The (blue) electron beam is deflected up, down, left, and right.

FIG. 2 shows the configuration of the deflection yoke 20. This figure shows a cross section (xy plane) perpendicular to the tube axis (z axis).

In the deflection yoke 20, a vertical separator 4 and a horizontal separator 5 are sequentially arranged on the inner surface side of the circular core 1. The inner surface of the vertical separator 4 is not provided in the vicinity of the x-axis end, and the other portion is gradually separated from the inner surface of the core 1 as it becomes farther from the x-axis end, and is most distant from the inner surface of the core 1 at the y-axis end. It is formed as follows. On the outer surface of the vertical separator 4, a rib 6 for positioning the core 1 is provided. In addition, the horizontal separator 5 is y
It is composed of an arc decentered in the axial direction. The horizontal deflection coil 3 is wound around the horizontal separator 5 in a saddle shape. The vertical deflection coil 2 is wound around the vertical separator 4 on the circumference where the vertical separator 4 is located, and is directly wound on the core 1 on the circumference where the vertical separator 4 is not located (near the x-axis end).

Here, the horizontal deflection coil 3 is generally formed to generate a pincushion magnetic field in order to correct convergence characteristics and image distortion characteristics. Therefore, when viewed in a cross section (xy plane) perpendicular to the tube axis (z axis), the wire rod of the horizontal deflection coil 3 concentrates on the x axis end and y
It is less at the shaft end.

On the other hand, since the vertical deflection coil 2 does not require a pincushion magnetic field as much as the horizontal deflection coil 3, the linear product per angle is represented by the x-axis in the sum of the horizontal deflection coil 3 and the vertical deflection coil 2. The end is larger than the y-axis end. The inner diameter of the core 1 is the horizontal deflection coil 3 at the x-axis end,
It is regulated by the linear product of the vertical deflection coil 2 and the thickness of the horizontal separator 5 and the vertical separator 4.

As described above, in the deflection yoke 20 according to the present embodiment, the vertical separator 4 is provided near the x-axis end where the sum of linear products of the vertical deflection coil 2 and the horizontal deflection coil 3 per unit angle is largest. It is not to be provided. This makes it possible to reduce the inner diameter of the circular core 1 by the thickness of the vertical separator 4,
The deflection efficiency of the vertical deflection coil can be increased.

Since the deflection yoke 20 is provided with the vertical separator 4, the winding position of the vertical deflection coil 2 can be regulated by providing a rib on the inner surface side of the vertical separator 4. FIG. 3 shows a configuration in which a rib 7 is provided on the inner surface side of the vertical separator 4. In the above-described embodiment, the vertical separator 4 is provided except for the x-axis end. However, as shown in FIG. 4, a portion without the vertical separator 4 may be further increased. This makes it possible to generate a local magnetic field distribution for correcting higher-order misconvergence and image distortion in the vertical deflection coil 2b and the horizontal deflection coil 3b.

[0032]

According to the present invention, the separator for the vertical deflection coil is provided only on a part of the circumference, and there is no adverse effect such that the winding position of the vertical deflection coil cannot be regulated. And the deflection efficiency can be improved.

The inner surface of the core 1 is separated from the inner surface of the core 1 as the distance from the x-axis end increases, and further away from the inner surface of the core 1 at the y-axis end. Thereby, even if the circular core 1 is used, the vertical deflection coil 2 can be brought into close contact with the horizontal separator 5. Furthermore, a rib can be provided on the inner surface side of the vertical separator, and the vertical deflection coil can be accurately wound.

Further, a circular core is used,
The deformation during the core firing can be prevented, and the inner and outer surfaces of the core can be easily polished, thereby preventing an increase in cost.

[Brief description of the drawings]

FIG. 1 is a diagram showing a cathode ray tube device showing an embodiment of the present invention.

FIG. 2 is a sectional view of a deflection yoke in the embodiment.

FIG. 3 is a cross-sectional view showing a deflection yoke in which ribs are provided on the inner surface of a vertical separator in the embodiment.

FIG. 4 is a cross-sectional view showing a deflection yoke in which a vertical deflection coil is directly wound around a core at a plurality of positions in the embodiment.

FIG. 5 is a view showing a conventional cathode ray tube device.

FIG. 6 is a sectional view showing a conventional deflection yoke.

FIG. 7 is a sectional view showing a deflection yoke in which a vertical separator is eccentric in a y-axis direction.

FIG. 8 is a sectional view showing a deflection yoke in which a vertical deflection coil is directly wound around a core.

FIG. 9 is a sectional view showing a deflection yoke in which a core is eccentric in the y-axis direction.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Core, 2 ... Vertical deflection coil, 3 ... Horizontal deflection coil, 4 ... Vertical separator, 5 ... Horizontal separator, 6, 7 ... Rib, 10 ... Cathode ray tube Device, 10a: neck portion, 10b: funnel portion, 20: deflection yoke

Claims (3)

[Claims] 1. A first separator for a vertical deflection coil and a second separator for a horizontal deflection coil are sequentially arranged on the inner surface side of a circular core, and the first separator is provided only on a part of the circumference. The horizontal deflection coil is wound around the second separator in a saddle shape, and the vertical deflection coil is wound around the first separator on the circumference where the first separator is located, and the first separator is wound around the circumference. A deflection yoke, which is wound directly around the core on a non-circular circumference. 2. The method according to claim 1, wherein the first separator has at least x
The inner surface of the first separator is provided except for the vicinity of the shaft end, and the inner surface of the first separator is separated from the inner surface of the core as the distance from the x-axis end increases, and the innermost surface of the first separator is separated from the inner surface of the core at the y-axis end. The deflection yoke according to claim 1. 3. The deflection yoke according to claim 1, wherein a rib for regulating a winding position of the vertical deflection coil is provided on an inner surface of the first separator.