JPH081789B2 - Deflection yoke - Google Patents

Description

TECHNICAL FIELD The present invention relates to a deflection yoke used in a cathode ray tube.

[Conventional technology]

The deflection yoke for a high resolution cathode ray tube used for a monitor for a character display or a graphic display, which has been rapidly developed in recent years as a computer terminal device, tends to have a high horizontal deflection scanning frequency in order to improve display performance. Conventionally, this horizontal deflection frequency was about the same as the deflection frequency of 15.75 KHz for televisions, but with the increase in resolution, it was 64 KHz or higher, with a maximum of 130 KH.
It has come to be used at high frequencies as high as z.

When the frequency of the sawtooth wave current of the deflection flowing through the deflection yoke increases, the eddy current loss and the skin loss of the deflection coil increase. On the other hand, in the core for the deflection yoke, eddy current loss and hysteresis loss also tend to increase.
When the deflection yoke operates, these losses appear as the entire heat generation of the deflection yoke itself, resulting in an increase in the temperature of the deflection yoke, impairing the reliability, and causing misconvergence, mislanding, and raster distortion. As a display device, there is a possibility of causing a fatal performance defect.

The generation of the eddy current will be described with reference to the saddle type horizontal deflection coil (1) shown in FIGS. 4 and 5. This horizontal deflection coil (1) is formed by winding a conducting wire (5), and the magnetic flux generation state of the winding conducting wire is as shown in FIG. Here, in each conductor (5a) ~ (5c),
Since the electric currents flow in the same direction, the magnetic fluxes φa to φc created by the respective conducting wires (5a) to (5c) around the conducting wires (5a) to (5c) are adjacent to each other.
(5a) to (5c) as a result of crossing (5c)
Limits the effective conductor cross section of the current flowing in This causes a kind of eddy current loss, which increases as the frequency of the current flowing through the horizontal deflection coil (1) increases.

Therefore, as a measure against heat generation of the horizontal deflection coil, as shown in Japanese Patent Laid-Open No. 59-186239, a twisted wire of thin wire,
A so-called litz wire is often used for a coil forming conductor. Its structure is shown in FIG. In the same figure, the diameter of each strand (3) covered with the insulating layer (4) is about 1/3 to 1/4 of the conductor wire which is conventionally used as a deflection yoke for televisions. That is, a plurality of wires having a wire diameter of 0.1 to 0.15 mm are twisted together, and the effective conductor width of the coil is reduced to reduce the eddy current loss generated inside the coil conductor.

[Problems to be solved by the invention]

However, when the saddle type coil (1) as shown in FIG. 4 is used as the horizontal deflection coil having a high deflection frequency, the deflection yoke is formed by bundling several conductor wires and winding them in a die and heating them by energization heating. It is generally made by coil fusion molding. In the saddle type coil that undergoes such a manufacturing process, the ridge wire (2) shown in FIG. 7 is difficult to handle because of its structure, which causes problems such as variations in products and deterioration in manufacturing yield. Up to 64KHz scanning, it is possible to suppress heat generation to a level where there is no practical problem by using the rits wire (2) and the use of low-loss core material, but at 130KHz scanning, even if the rits structure is adopted, heat is generated. As for, it is still insufficient. That is, even if the lit structure is adopted, it is difficult to suppress the heat generation of the deflection coil to a level at which there is no practical problem. From the above, there are three problems when the conventional problems are sorted out.

In other words, the first problem with the conventional deflection yoke is that the deflection coil for the deflection yoke using a single wire-shaped conducting wire has an effective disconnection of the conduction path due to mutual flux linkage of the wound conducting wires even when the deflection frequency is about 64 KHz. Due to the reduction of the area and the loss of the eddy current, there was heat generation and there was a practical problem.

As the second problem, as a means for solving the first problem, since a deflection wire having a deflection frequency of about 64 KHz is unavoidably used, it is inevitable to use a ricks-structured conductor wire (shown in FIG. 7). Since they are matched, it is difficult to form a saddle type coil (shown in FIG. 4), and as a result, there is a problem in that product variations and manufacturing yields are poor.

Further, as a third problem, when the deflection frequency is further increased to about 130 KHz, there is a problem in using the conductor wire of this rit structure even in the case of using the conventional conductor wire of the rit structure, because of the heat generation due to the increase of the current loss. .

The present invention has been made to solve the above problems, and an object of the present invention is to provide a deflection yoke capable of sufficiently reducing heat generated in the entire horizontal deflection coil during high frequency scanning. .

[Means for solving problems]

In the deflection yoke according to the present invention, a magnetic layer having a high magnetic permeability and a magnetic layer having a high magnetic permeability are provided on an outer surface of a conductor of a conductor for forming at least one of a horizontal deflection coil and a vertical deflection coil, instead of a conventional insulating layer. An insulating layer is continuously provided on each of the layers, the magnetic layer suppresses a magnetic flux passing through the inside of the conductor, and the insulating layer insulates the outermost circumference of the conductor. It is characterized in that a deflection coil is configured.

[Action]

According to the present invention, the outer circumference of the conductor of the conductor for forming the deflection yoke is provided with a continuous magnetic layer having a high magnetic permeability in advance and an insulating layer on the magnetic layer. The conductor of the conducting wire is insulated, and the passage of the magnetic flux into the adjacent conductor is reduced, and the effective conductor area does not decrease even during high frequency scanning.For example, regarding the structure of the conducting wire for the horizontal deflection coil at about 64 KHz. Even if the rit structure is not taken, that is, even if the structure of the conventional single wire-shaped conductor is used, the heat generation of the entire horizontal deflection coil is suppressed.

Example of Invention

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a horizontal deflection coil forming conductor of a deflection yoke according to the present invention. In the figure, (6) is a thin single wire conductor, and a high magnetic permeability magnetic layer (7) made of iron plating is continuously formed on the outer peripheral surface of the conductor (6). To an insulating layer (4). These conductor (6), magnetic layer (7) and insulating layer (4)
A horizontal deflection coil (1) is formed by winding or forming a single wire conductor (8) made of, for example, a saddle shape as shown in FIG.

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

Since there are magnetic layers (7) made of iron plated and having high magnetic permeability on the surfaces of the conductors (8a) to (8c), the magnetic fluxes φa to φc generated from the adjacent conductors (8a) to (8c) are Bypassed to (7). Therefore, each conductor (6a)
(6c) Passage of the magnetic fluxes φa to φc to the inside is suppressed. As a result, the frequency of the current flowing in the horizontal deflection coil (1)
Even if the frequency is as high as 64 KHz, it is possible to effectively pass a high-frequency current through the conductor without reducing the effective conductor cross-sectional area. That is, if the deflection frequency is up to about 65 KHz, the eddy current loss can be obtained by simply winding the single-wire-shaped conductor wire (8) having the above-mentioned configuration shown in FIG. With suppression, the horizontal deflection coil can be configured, which can contribute to the ease of manufacturing the deflection yoke. That is, the conventional problems described above can be solved.

FIG. 3 shows another example of the present invention, in which a magnetic layer (7) and an insulating layer (4) are formed on a conductor wire (8) having the above-mentioned structure, for example, a wire having a diameter of 0.1 to 0.2 mm. It is a rope wire (9) made by twisting several single wires into one.
The rope wire (9) is wound in a saddle shape to form a horizontal deflection coil (1). In this case, even if there is a sacrifice in manufacturing complexity due to the rit structure, the effect of reducing the effective conductor width from the conventional structure due to the rit structure and the new effect of the previous embodiment, that is, the insulating layer is included. The eddy current loss can be greatly reduced by the synergistic effect of the magnetic layer (7) and the effect of reducing the interlinkage magnetic flux density to the adjacent conductor (6), and the deflection frequency of 64 KHz or more, especially up to about 130 KHz is also supported. It will be possible.

In each of the above examples, the magnetic layer (7) is made of iron plating, but other magnetic plating may be used.
Further, it may be formed by a method other than plating.

Further, in the above example, the horizontal deflection coil (1) has been described, but the configuration of the present invention is also applicable to the vertical deflection coil.

〔The invention's effect〕

As described above, according to the present invention, a magnetic layer having a high magnetic permeability and the magnetic layer are formed on the outer surface of the conductor of the conductor for forming at least one of the horizontal deflection coil and the vertical deflection coil in place of the conventional insulating layer. An insulating layer is continuously provided on the layer in the flow direction of the conductor, the magnetic layer suppresses the magnetic flux passing inside the conductor of the conductor, and the insulating layer insulates the outermost circumference of the conductor. Since the above deflection coil is formed by winding molding, if the deflection frequency is up to about 64 KHz, the horizontal deflection coil does not have to use a ridge wire, which is difficult to form its winding wire. The conductor wire (8) of the present invention can be used in a heat generation state lower than that of the conventional single wire-shaped conductor wire. In other words, the deflection frequency is 64KH
Up to about z, for example, even if a single wire-shaped conductor of the present invention is used in place of the conventional ridge wire, the interlinkage magnetic flux generated between the adjacent conductors of the deflection coil at a high deflection frequency is generated inside the conductor of the conductor. The magnetic layer suppresses passage. As a result, the effective conductor cross-sectional area of the current path flowing through the conductor portion of the conductor can be suppressed, and the eddy current loss can be reduced. In other words, as a result, a deflection yoke that generates less heat than the conventional deflection coil over the entire deflection coil can be obtained. It is easy to manufacture, and from the point of view of performance only, there is an advantage that the rits structure can effectively suppress heat generation even at a higher deflection frequency, for example, 130 KHz deflection scanning.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a horizontal deflection coil forming conductor which is an embodiment of the deflection yoke according to the present invention, and FIG. 2 is an operation explanatory view when the horizontal deflection coil is formed by the first conductor, and FIG. FIG. 4 is a sectional view showing another example of the present invention, FIG. 4 is a perspective view showing a saddle type horizontal deflection coil, FIG. 5 is a schematic sectional view of a saddle type horizontal deflection coil, and FIG. 6 is a conductor wire of a conventional structure. FIG. 7 is an explanatory view of the operation when a horizontal deflection coil is molded, and FIG. 7 is a sectional view of a conventional ridge line. (1) ... saddle type horizontal deflection coil, (6) ... conductor,
(7) ... Magnetic layer, (8) ... Conductive wire, (9) ... Ritsu wire. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (3)

[Claims] 1. A conductor for forming at least one of a horizontal deflection coil and a vertical deflection coil, a conductor having a magnetic layer of high permeability and an insulating layer formed on the magnetic layer in that order on the outer surface of the conductor. Is continuously provided in the length direction of the wire, and the magnetic layer suppresses a magnetic flux passing inside the conductor of the wire, and the insulating layer insulates the outermost circumference of the wire. A deflection yoke comprising the above deflection coil. 2. A deflection yoke according to claim 1, wherein the conducting wire is formed as a stranded wire. 3. The deflection yoke according to claim 1 or 2, wherein the magnetic layer is formed by plating.