JP2001093439A - Deflection yoke and color cathode-ray tube image receiver using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a deflection efficiency of a deflection yoke, which has been difficult because it is necessary that an inner diameter of a horizontal deflection coil should be narrowed or a length of the coil should be prolonged, however, the horizontal deflection coil should be made small in the former case, which may cause a coil wire to be easily heated up, on the other hand, there is a restriction on a neck shadow and the like in the later case. SOLUTION: In a deflection yoke having a saddle type horizontal deflection coil and in a color cathode-ray tube image receiver using the deflection yoke, for example, a bend area 22A at a large caliber side of a saddle type horizontal deflection coil 15A (15B) is divided for example into three wherein several numbers of coil wires are bundled, and the three divided bent parts 23-1, 23-2, and 23-3 are arranged for example in the direction of Y-axis with being spaced away from each other by a specified clearance, therefore, inductance of the horizontal deflection coils 15A and 15B can be made small.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a deflection yoke and a color cathode ray tube receiver using the same, and more particularly, to a deflection yoke having a saddle type saddle-type horizontal deflection coil and a color cathode ray tube receiver using the same.

[0002]

2. Description of the Related Art In a color cathode ray tube used in a television receiver or a display monitor, a color image is displayed on a screen by deflecting the traveling directions of three electron beams emitted from an electron gun up, down, left, and right. Has been assembled. A deflection yoke having a horizontal deflection coil and a vertical deflection coil is used to deflect the electron beam.

[0003] The deflection yoke is mounted on a portion called a cone from the neck of the cathode ray tube to the funnel. In this deflection yoke, a deflection magnetic field is formed by flowing a horizontal deflection current to a horizontal deflection coil and a vertical deflection current to a vertical deflection coil on the trajectory of three electron beams emitted from the electron gun. The electron beam is deflected up, down, left, and right by the deflection magnetic field.

Here, the horizontal deflection coil of the deflection yoke generally has a saddle (saddle) shape as shown in FIG. In the horizontal deflection coil 100, the magnetic field generated by the bend portions 101 and 102 does not contribute much to the deflection of the electron beam, and the extension of the magnetic field in the Z-axis direction (the depth direction of the cathode ray tube) is reduced. However, it works to lower the deflection efficiency.

[0005]

By the way, due to the recent improvement of the horizontal scanning frequency and environmental problems, it has become more important to improve the deflection efficiency of the deflection yoke. In order to improve the deflection efficiency, it is generally conceivable to reduce the inner diameter of the horizontal deflection coil or lengthen the coil.

However, in order to reduce the inner diameter of the horizontal deflection coil, it is necessary to reduce the size of the horizontal deflection coil. As a result, a new problem arises in that the coil wire tends to generate heat. On the other hand, increasing the coil length of the horizontal deflection coil is not easy due to restrictions such as neck shadows. Here, the neck shadow refers to a phenomenon in which the electron beam collides with the inner wall surface of the neck portion during traveling, and the traveling of the electron beam is disturbed and appears as a shadow on the screen.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a deflection yoke capable of improving deflection efficiency by reducing the inductance of a horizontal deflection coil and a collar using the same. An object of the present invention is to provide a cathode ray tube receiver.

[0008]

A deflection yoke according to the present invention has a saddle type horizontal deflection having a loop shape and comprising a longitudinal coil portion for generating a main deflection magnetic field directly contributing to the deflection of an electron beam and other bend portions. The horizontal deflection coil has a structure in which a bend portion is divided into a plurality of coil wires as a group. This deflection yoke is used for a color cathode ray tube receiver.

In the deflection yoke and the color cathode ray tube receiver using the same, when the bend portion of the horizontal deflection coil is divided into a plurality of bundles of a plurality of coil wires, the larger the interval between the divided bend portions is, The effect of the mutual inductance acting on the coil wire between the divided bend portions is reduced, and as a result, the inductance of the horizontal deflection coil is reduced. As the inductance decreases, the deflection efficiency of the deflection yoke increases.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic perspective view showing an overall image of a color cathode ray tube to which the present invention is applied.

In FIG. 1, a panel 12 having a fluorescent screen provided on an inner surface is mounted on an opening of a picture tube valve 11,
An electron gun 13 for emitting an electron beam is sealed in the rear end of the picture tube valve 11. A cone-shaped deflection yoke 14 for deflecting the electron beam emitted from the electron gun 13 is attached to the neck of the picture tube valve 11.

FIG. 2 is a side view including a partially broken cross section of the deflection yoke 14 according to the present invention. As is apparent from FIG. 2, the deflection yoke 14 includes a saddle-type horizontal deflection coil 1.
5, parts such as a saddle-type vertical deflection coil 16, a coil bobbin (coil holder) 17, a core 18, and a ring magnet 19 are provided.

The horizontal deflection coil 15 and the vertical deflection coil 16 deflect the electron beam emitted from the electron gun 13 in the horizontal direction (horizontal direction) and the vertical direction (vertical direction) of the screen. These deflection coils 15 and 16 are mounted on a coil bobbin 17 having a cone shape. Specifically, the horizontal deflection coil 15 is mounted on the inner peripheral side of the coil bobbin 17, and the vertical deflection coil 16 is mounted on the outer peripheral side of the coil bobbin 17.

The core 18 is made of ferrite, and is mounted so as to cover the deflection coils 15 and 16 in order to further increase the efficiency of the magnetic field generated from the deflection coils 15 and 16. The ring magnet 19 is provided on the neck side of the deflection yoke 14 to correct an assembly error of the electron gun 13.

FIG. 3 is a schematic perspective view showing an example of the configuration of the saddle type horizontal deflection coil 15 as viewed obliquely from the rear. FIG. 4 is a schematic configuration diagram viewed from the front, and FIG. 5 is a cross-sectional view taken along the line AA 'in FIG.

The horizontal deflection coil 15 is composed of a pair of coils 15A and 15B mounted on the upper and lower sides of the X axis when viewed from the panel side. The pair of horizontal deflection coils 15A and 15B have exactly the same shape.
Hereinafter, description will be made by taking the upper horizontal deflection coil 15A as an example.

As can be clearly seen from FIG. 3, the horizontal deflection coil 15A has a loop shape, and longitudinal coil portions 21A, 21 which generate a main deflection magnetic field directly contributing to the deflection of the electron beam.
B and the other bend portions 22A and 22B. In the horizontal deflection coil 15A, of the bend portions 22A and 22B, the bend portion 22 on the large diameter side is used.
A is formed by dividing a plurality of (three in this example) a plurality of coil wires as a set.

In the large-diameter bend portion 22A,
The divided bend units 23-1, 23-2, 23-3 divided into three parts
Are provided at a distance D from each other in the Y-axis direction. The horizontal deflection coil 15A is formed by a mold winding. At this time, a pin is set in the middle of winding the coil wire, the running direction of the coil wire is changed, and in the case of the present example, the winding is divided into three layers, so that three divided bend portions 23 are formed on the large diameter side. The saddle-type horizontal deflection coil 15A having -1, 23-2, and 23-3 can be easily formed.

The same applies to the saddle type horizontal deflection coil 15B as to the saddle type horizontal deflection coil 15A. Thus, the saddle type horizontal deflection coil 15A,
In 15B, for example, the saddle type horizontal deflection coils 15A, 15B are formed by dividing the bend portion 22A on the large diameter side into a group of several turns (several coil wires) and dividing each other.
The inductance of B can be reduced.

In the case of the horizontal deflection coils 15A and 15B, the frequency of the horizontal deflection current I is high.
Assuming that the inductance of A and 15B is L, LI ² is an index of the deflection efficiency of the deflection yoke 14. Accordingly, since the LI ² is reduced by lowering the saddle-type horizontal deflection coil 15A by dividing the bend 22A, the inductance L of 15B, it becomes possible to improve the deflection efficiency. In particular, since the bend portion 22A is not a coil portion for generating a main deflection magnetic field that directly contributes to the deflection of the electron beam, the deflection efficiency of the deflection yoke 14 can be improved without greatly changing the dimensions of the horizontal deflection coils 15A and 15B. it can.

Here, the reason why the inductance is reduced by dividing the bend portions of the horizontal deflection coils 15A and 15B into blocks of several turns will be described.

Generally, the inductance L is a combination of the self-inductance L0 and the mutual inductance M acting between the coil wires when there are two or more coil wires. L = L0 + M1 + M2 + M3 +... At this time, the inductance change due to the distance between the coils is due to the influence of the mutual inductance M.

Here, for the sake of simplicity, a description will be given of a mutual inductance that affects two parallel lines.
The magnetic flux A generated by the current I is represented by the following equation (1).

[0024]

(Equation 1)

The inductance L (W
b / A) is a value obtained by dividing the magnetic flux of the above equation (1) by the current. From this equation, as shown in FIG. 6, when the distance between two parallel lines is d, the distance between ds1 and ds2 is r, and the line length is h, the mutual inductance M between the two parallel lines is Equation (2).

[0026]

(Equation 2)

As is apparent from the above equation (2), the effect of the mutual inductance M decreases as the distance d between the coil wires increases, and as a result, the inductance of the coil wire decreases. Therefore, in the saddle type horizontal deflection coils 15A and 15B, the distance D between the three divided bend portions 23-1, 23-2 and 23-3 corresponds to the coil wire distance d, and the bend portion 22A is divided. By doing so, the inductance of the horizontal deflection coils 15A and 15B can be reduced.

As described above, the saddle type horizontal deflection coil 15
By lowering the inductances of the A and 15B, the deflection efficiency of the deflection yoke 14 can be improved, and the degree of freedom in the arrangement between the bend portions 22A and 22B increases. This is advantageous for countermeasures for (center beam) displacement. Further, the bend unit 22
Since A and 22B are stratified (divided), the correlation withstand voltage of the coil wire is also advantageous.

Conversely, when a structure in which the bend portions 22A and 22B are stratified is employed, the number of turns is increased so that the inductance becomes equal to that in the case where the bend portions 22A and 22B are not employed, so that the horizontal deflection current can be reduced. This can contribute to lower power consumption. In addition, the divided bend portions 23-1 and 23 of each layer
The degree of freedom of the characteristics of the horizontal deflection coils 15A and 15B is increased by changing the interval D and the shape between -2 and 23-3.

In the above embodiment, in the horizontal deflection coil 15A (15B), the large-diameter side bend portion 22A
However, it is possible to stratify the bend portion 22B on the small-diameter side, which is less effective than the stratification on the large-diameter side. However, the inductance can be reduced.

Further, in the above-described embodiment, in the horizontal deflection coil 15A (15B), the large-diameter side bend portion 22A
Is divided in the Y-axis direction. However, as shown in FIG. 7, it is also possible to divide in the Z-axis direction. In this case as well, the inductance can be reduced by the same principle.

[0032]

As described above, according to the present invention,
In the deflection yoke having the saddle-type horizontal deflection coil and the color cathode ray tube receiver using the same, the inductance of the horizontal deflection coil is reduced by dividing the bend portion of the horizontal deflection coil into a plurality of bundled coil wires. To reduce the inner diameter of the horizontal deflection coil,
The deflection efficiency of the deflection yoke can be improved without lengthening the coil.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing an overall image of a color cathode ray tube to which the present invention is applied.

FIG. 2 is a side view including a partially broken surface of the deflection yoke according to the present invention.

FIG. 3 is a schematic perspective view showing an example of the configuration of a saddle-type horizontal deflection coil according to the present invention, as viewed obliquely from behind.

FIG. 4 is a schematic configuration diagram of a saddle type horizontal deflection coil according to the present invention as viewed from the front.

FIG. 5 is a sectional view taken along the line AA ′ of FIG. 4;

FIG. 6 is a diagram for explaining the principle of reducing the inductance of the horizontal deflection coil.

FIG. 7 is a sectional view of a main part showing another example of the saddle type horizontal deflection coil according to the present invention.

FIG. 8 is a schematic perspective view showing a horizontal deflection coil according to a conventional example.

[Explanation of symbols]

11 picture tube valve, 13 electron gun, 14 deflection yoke, 15, 15A, 15B horizontal deflection coil, 16 vertical deflection coil, 22A, 22B bend section, 23-1, 2
3-2, 23-3: Split bend section

Claims (2)

[Claims] 1. A longitudinal coil portion which forms a loop shape and generates a main deflection magnetic field which directly contributes to the deflection of an electron beam, and a bend portion other than the longitudinal coil portion, wherein the bend portion is formed by grouping a plurality of coil wires into a plurality. A deflection yoke having a saddle-type horizontal deflection coil divided into 2. A long coil portion which forms a loop shape and produces a main deflection magnetic field which directly contributes to the deflection of an electron beam, and a bend portion other than the longitudinal coil portion, wherein the bend portion is formed by grouping a plurality of coil wires. A color cathode-ray tube receiver using a deflection yoke having a saddle-type horizontal deflection coil divided into two.