JPS62216140A - Deflecting yoke - Google Patents

Abstract

PURPOSE:To reduce an eddy current loss so as to lower the generation of heat in a deflecting yoke, by forming a magnetic layer on the outer surfaces of forming wires of at least one pair of coils among horizontal and vertical deflecting coils. CONSTITUTION:A deflecting coil forming conductor is constituted of a fine solid conductor 6, and a magnetic layer 7 by ferro-plating is coated on this outer circumferential surface, covering it with an insulating layer 4. Next, a conductor 8 formed like this is wound in a saddle type, setting down to a deflecting coil 1. If doing like this, such the magnetic layer 7 that is high in magnetic permeability exists on each surface of conductors 8a-8c so that magnetic flux phia-phic to be produced out of these adjacent conductors 8a-8c are bypassed through the magnetic layer 7, thus passing of the magnetic flux into each inside of the conductors is suppressed. In consequence, even when the frequency of an electric current flowing in the coil 1 is higher as much as 64kHz or so, a high frequency current is effectively flowable without entailing any reduction in an effective conductor sectional area.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a deflection yoke used in a cathode ray tube.

[Conventional technology]

Deflection yokes for high-resolution cathode ray tubes used in character displays and graphic ink display monitors, which are rapidly developing as computer terminal equipment in recent years, tend to have higher horizontal deflection scanning frequencies in order to improve display performance. be.

Conventionally, this horizontal deflection frequency was about the same as the deflection frequency for television, 15.75 KHz, but with the increase in resolution, it has increased to 64 KHz or higher, up to 180 KHz.
It has come to be used at frequencies as high as KHz.

When the frequency of the deflection sawtooth current flowing through the deflection yoke increases, the eddy current product and skin loss of the deflection coil increase. Furthermore, in the core for a deflection yoke, the eddy current product and hysteresis loss tend to increase as well. When the deflection yoke is in operation, these losses are celebrated as heat generation in the deflection yoke itself, resulting in an increase in the temperature of the deflection yoke, which can reduce the reliability of the instrument and prevent misconvergence, mislanding, and raster distortion as a display device. The generation of the above-mentioned eddy current is explained as the fourth cause and the saddle type horizontal deflection coil (1) shown in FIG. 5 will be explained.

This horizontal deflection coil (1) is formed by winding the conducting wire L51, and the magnetic flux generation state of the wound conducting wire is as shown in FIG. Here, each conducting wire (5a) to (
5c), the current flows in the same direction, so each conductor (6
a) The magnetic flux φ, ~φ, created around ~(5C) crosses the adjacent wires (5a)~(5C), and as a result, the current flows through the conductors (5a)~(5C). limits the effective conductor cross-sectional area. This causes an eddy current loss, which increases as the frequency of the IFL flow flowing through the horizontal deflection coil (1) increases.

For this reason, as a countermeasure against heat generation in horizontal deflection coils, thin twisted wires, so-called Lindt wires, are often used as conductive wires for coil forming, as disclosed in Japanese Patent Application Laid-Open No. 59-186289. Its structure is shown in FIG. In the same figure,
The Lindt wire (2) consists of each strand (3) covered with an insulating layer (4).
) has a diameter of about 1/3 to 1/4 of the 2!4 strain conventionally used as a deflection yoke for televisions, that is, the wire diameter is 0.
．． It is made by twisting multiple strands of 1 to 0.15M.
By reducing the effective conductor width of the coil, the thin flow loss occurring inside the coil conducting wire is reduced to 411M.

[Problem that the invention seeks to solve]

However, when using a saddle-shaped coil (1) as shown in Figure 4 as a horizontal deflection coil with a high deflection frequency, the deflection yoke is made by bundling several conductive wires and winding them around a mold. It is generally made by coil fusion molding. In saddle-type coils that go through this manufacturing process, the aforementioned Lindt wire (2) is difficult to handle due to its structure.
There are problems such as product variations and deterioration of manufacturing yield. Furthermore, up to the scanning level of 6 4 Kl (z), heat generation can be suppressed to a level that poses no practical problem by using a Litz wire (2) or a low-loss core material; Even if it is adopted, it is still insufficient in terms of heat generation.

This invention solves the above problems.

The object of this invention is to provide a deflection yoke that can effectively reduce eddy current loss in response to high frequency scanning.

[Means for solving theme points]

The deflection yoke according to the present invention has a magnetic layer formed on the outer surface of a conductor of a coil-forming wire.

[Effect]

In this invention, because of the magnetic layer of the conductor of the coil-forming conductor, the passage of magnetic flux into the interior of the adjacent conductor is reduced, and even in the case of high frequency scanning, the expiration of the UI blood flow is not reduced, and for example, 64 K to 1z To some extent, heat generation is suppressed by adopting a hibernated structure.

[Example of Gu C Ming]

Hereinafter, an embodiment of the present invention will be explained in a simplified form.

No. 11 shows a conducting wire for forming a horizontal deflection coil of a deflection yoke according to the present invention. In the figure, (6) is a thin single wire conductor, and the outer peripheral surface of this conductor (6) is coated with magnetic 1iJ (7) by iron plating, and is covered with an insulating layer (4). These conductors (6) and magnetic 1
A horizontal deflection coil (1
) is formed.

Next, the operation of the above configuration will be explained with reference to FIG.

Since there is a magnetic layer (7) with high permeability made of iron plating on the surface of each conducting wire (8a) to (8C), the magnetic flux φa to φC generated from the adjacent conducting wires (8a) to (8C) is absorbed by the magnetic layer. (bypassed by the force. Therefore each conductor (6a)
~(6c) Passage of the magnetic fluxes φa to φC into the interior is suppressed. As a result, even when the frequency of the current flowing through the horizontal deflection coil (1) is as high as about 64 KHz, it is possible to effectively flow a high-frequency current through the conductor without reducing the effective cross-sectional area of the conductor. In other words, if the deflection frequency is up to about 65 KHz, eddy current loss can be suppressed by simply winding the conducting wire (8) with the above configuration in a saddle shape, which facilitates the manufacture of the knitting yoke. I can contribute.

FIG. 3 shows another example of this structure, and shows the conductor (
8), for example, a Lindt wire (
9), and the horizontal deflection coil (1) is formed by winding this litz wire (9) in a saddle shape.

In this case, even if the Linz structure has manufacturing advantages, the effect of reducing the effective conductor width due to the Linz structure and the effect of reducing the magnetic flux density towards the adjacent conductor (6) due to the magnetic layer (7) Due to the synergistic effect, the eddy current product can be significantly reduced.
If the deflection frequency is 64 KHz or higher, especially 180 Kl (
It can also be applied to objects up to about z.

Although the magnetic layer (7) on each side has been described as being made of iron plating, other magnetic plating may be used or it may be formed by a method other than plating.

Further, in the above example, the horizontal deflection coil (1) was explained, but the configuration of the present invention can also be applied to a vertical deflection coil.

〔Effect of the invention〕

As described above, the present invention provides a horizontal deflection coil and an "I-
Since magnetic J- is formed on the outer surface of the conductor of at least one of the shaping conductors of the 71 Mad direction coil, eddy current loss is reduced without using Lindt wire, which is difficult to wind, for example, in the horizontal deflection coil. In other words, it is possible to easily manufacture a deflection yoke with low heat generation, and from a performance point of view, by adopting the Lindt structure, it is possible to easily produce a deflection yoke with low heat generation.
Also in deflection scanning, there is an advantage that heat generation can be effectively suppressed.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a conductor for forming a horizontal deflection coil, which is an embodiment of the deflection yoke according to the present invention, FIG. 4 is a perspective view showing a saddle-type horizontal deflection coil, FIG. 5 is a schematic sectional view of the saddle-type horizontal deflection coil, and FIG. 6 is a cross-sectional view showing another example of the present invention. FIG. 7, which is an explanatory diagram of the operation when a horizontal deflection coil is formed, is a sectional view of a conventional Linz wire. (1)...Saddle type horizontal deflection coil, (6)...Conductor, (7)...Magnetic layer, (8)...Conducting wire, (9)...
...Linz Line. In addition, in the figures, the same reference numerals indicate the same or corresponding parts. Agent Dai Kyou 117 Sen 1 Figure z 5.7゜

Claims (3)

[Claims] (1) A deflection yoke characterized in that a magnetic layer is provided on the outer surface of a conductor for shaping of at least one of a horizontal deflection coil and a vertical deflection coil. (2) The deflection yoke according to claim 1, wherein the conducting wire is configured as a group of twisted wires. (3) The deflection yoke according to claim 1 or 2, wherein the magnetic layer is formed by plating.