JPS62241242A - Deflection yoke device - Google Patents

Abstract

PURPOSE:To reduce unrequired radiation of a horizontal deflection magnetic field by a method wherein the magnetic field generated by canceling coils toroidally wound on the core forms the inverse magnetic field to the horizontal deflection magnetic field leaking outside the main body of the deflection yoke. CONSTITUTION:In a deflection yoke device, horizontal deflection coils 2, 3, vertical coils 4, 5 and canceling coils 8, 9 are energized by the prescribed currents respectively. Thereby, the unrequired radiation HR leaking outside the main body of the deflection yoke 7, which is a part of the horizontal deflection magnetic field HB generated by the horizontal deflection coils 2, 3, and the canceling magnetic field Hc generated by the canciling coils 8, 9 toroidally wound on a part of the core 1 through an auxiliary bobbin 10 on which the vertical deflection coils 4, 5 are not wound form opposite phase magnetic fields with each other. Thus, said unrequired radiation HR is reduced being partly canceled by the canceling magnetic field Hc.

Description

DETAILED DESCRIPTION OF THE INVENTION <Field of Industrial Application> The present invention relates to an improvement in a deflection yoke device mounted on a cathode ray tube of a television receiver, a CRT display device, or the like.

<Prior Art> As is well known, in a deflection yoke mounted on a cathode ray tube such as a television receiver or a CRT display device, a horizontal deflection current of 15.75 KHz is normally supplied to a horizontal deflection coil. 601-1 for painter deflection coil
It supplies a vertical deflection current l7 of Both the magnetic field and the vertical deflection magnetic field produce leakage magnetic fields to the outside of the deflection yoke. and,
The existence of this external leakage magnetic field does not have a large effect on the characteristics of the deflection yoke, and since the deflection yoke itself is a device (component) that utilizes the leakage magnetic field from the deflection coil, until recently, No measures were taken to reduce the external leakage magnetic field using the deflection yoke itself.

In contrast, in recent years, video equipment has become more diversified, such as by placing terminal equipment that supports high frequencies, such as combinations and lights, in close proximity to cathode ray tubes equipped with deflection yokes. Of the external leakage magnetic field of the deflection yoke, the external leakage magnetic field of the high frequency horizontal deflection magnetic field becomes unnecessary radiation.
There is a concern that the deflection yoke itself may have an adverse effect, such as causing malfunctions in other types of terminal equipment, and for this reason, it has become desirable to reduce unnecessary radiation using the deflection yoke itself.

In conventional deflection yokes, the basic principles of deflection yokes,
In other words, from the viewpoint that the deflection yoke uses the leakage magnetic field from the deflection coil to deflect the electron beam by a predetermined amount, in a small number of deflection yokes, a magnetic shield plate is provided to surround the outer periphery of the deflection yoke. The deflection yoke itself was not provided with any means for reducing unnecessary radiation, except for one in which unnecessary radiation was reduced by a magnetic shield plate.

<Problems to be solved by the invention> However, in the conventional deflection yoke in which a shield plate is provided to surround the outer periphery, there is a problem that the shield plate is large in size, and the shield plate is characteristically unnecessary. (
External leakage magnetic field) forms another deflection magnetic field, which improves the screen characteristics (landing).

There was a problem in that it gave negative effects to the image (funvergence, deflection distortion). On the other hand, with a deflection yoke that does not have any means for reducing unnecessary radiation, as mentioned above, it may cause malfunctions in intermediate models that are close to the deflection yoke, especially those compatible with high frequencies, or may cause disturbances in the video signal, causing normal operation. There is a problem in that it has negative effects such as not being able to obtain good image characteristics.

<Means for solving the problems> In order to solve the above problems, the deflection yoke device of the present invention has the following features:
A core, a pair of saddle-shaped horizontal deflection coils wound along the inner surface of the core, a pair of toroidal-shaped vertical deflection coils wound around the outer periphery of the core, and a horizontal deflection coil arranged on the inner surface of the core. and a coil bobbin that maintains insulation between the vertical deflection coils.The deflection yoke body is composed of a coil bobbin that maintains insulation between the vertical deflection coils, and the horizontal deflection magnetic field generated by the horizontal deflection coils in series with the horizontal deflection coil of the deflection yoke body and leaking to the outside from the deflection yoke body A pair of canceling coils that generate a magnetic field are connected, and the canceling coil is connected to the core −゛
It is formed by winding it in a toroidal shape.

Function: A pair of canceling coils are wound in a toroidal manner around a pair of canceling coils, and the horizontal leakage from the deflection yoke body generated by the horizontal deflection coil to the outside. Unnecessary radiation of the deflection magnetic field can be reduced by using a canceling magnetic field that is opposite to the unnecessary radiation generated by the canceling coil.

<Embodiment> Hereinafter, one embodiment of the deflection yoke device of the present invention will be described in detail with reference to the drawings. In FIGS. 1 and 2, reference numeral 1 denotes an annular core formed by joining a pair of semi-annular cores; core 1
A pair of saddle-shaped horizontal deflection coils 2.3 are wound on the inner surface, and a pair of toroidal-shaped vertical deflection coils 4 are wound on the outer periphery.
．． 5 is wrapped. A coil bobbin 6 is arranged on the inner surface of the core 1 and maintains insulation between the horizontal deflection coil 2.3 and the vertical deflection coil 4.5.
3. The deflection yoke main body 7 is constituted by the coils 4 and 5 in the 'M normal direction and the coil bobbin B. As shown in FIG. 3, a pair of canceling coils 8.9 are connected in series to the horizontal deflection coil 2.6, which forms part of the deflection yoke body 7, as shown in FIG. Cancellation coil 8
．． 9 generates a magnetic field opposite to the horizontal deflection magnetic field leaked to the outside from the deflection yoke main body 7 generated by the horizontal deflection coil 2.6, and is approximately 180° where the vertical deflection coil 4.5 of the core 1 is not wound. The non-wound parts located diagonally apart from each other, specifically, the outer periphery of the core 1 near the joint 1a, are wound in a toroidal manner via the auxiliary bobbin 10 that goes around the outer periphery of the core 1. It is. In this embodiment, the canceling coil 8.9 is constructed by using five turns of five 0.4φ copper wires twisted together or bundled without twisting and wound with a pie filer. It is something to do.

In the deflection yoke device having such a configuration, the horizontal deflection coil 2. Predetermined currents are applied to the JA direction coils 4 and 5 and the cancellation coils 8 and 9, respectively. On this occasion,
As shown in FIG. 4, in the horizontal deflection magnetic field [(B) generated by the horizontal deflection coil 2.3, unnecessary radiation T-TR leaking from the deflection yoke body 7 to the outside is Cancellation coil 8.9 is wound in a toroidal manner around the unwound portion of the vertical deflection coils 4 and 5 of γ1.
The canceling magnetic field t-Tc generated by t-Tc becomes a magnetic field in the opposite direction, and a part of it is canceled and reduced by the unnecessary radiation HRi:i canceling magnetic field Hc.

In one embodiment of the deflection yoke device of the present invention, an insulating means (insulating tube, -b, etc.) is provided on the core itself so that the cancel coil is connected to the core itself via an auxiliary bobbin, and the cancel coil is directly connected to the core without using an auxiliary bobbin. It may also be wound in a toroidal shape. In addition, in one embodiment of the deflection yoke of the present invention made of wood, a pair of semi-annular cores are joined to form an annular core. However, it is also possible to use a deflection yoke formed in advance into an annular shape. Of course. Furthermore, in this embodiment, the cancellation coil is constructed using five turns of 04Ω copper wires twisted together or bundled in a pie filer. The number of turns, etc. is not limited to the example, and can be changed or increased or decreased as appropriate in relation to the impedance of the horizontal deflection coil. When using copper wire with a thick wire diameter, for example, 05Ω to 10Ω, multiple wires may be twisted together. Rather than bundling, it is also possible to simply use several turns to form a toroidal structure.

<Effects of the Invention> The deflection yoke device of the present invention is as detailed above, and produces the following effects.

In other words, the magnetic field (cancelling magnetic field) generated by the canceling coil wound toroidally around the core is 1A from the deflection yoke body.
It forms a magnetic field opposite to the horizontal deflection magnetic field (unnecessary radiation) leaking to the horizontal deflection magnetic field (unnecessary radiation). It is extremely easy to prevent malfunctions in other models (combi, terminal equipment, etc.) that are close to the deflection yoke by simply winding it in a toroidal shape around the unwound part of the vertical deflection coil of the core. , the compact structure reduces unnecessary radiation, and is advantageous in terms of productivity and cost.Furthermore, the winding length of the canceling coil around the deflection yoke body is determined by using the core.
By winding the core in a toroidal manner and by using the unwound portion of the vertical deflection coil of the core, the shortest possible length can be obtained.Furthermore, by winding the coil closely around the core, the winding efficiency can be improved. It is possible to suppress the power loss of the deflection yoke body as much as possible. Furthermore, the winding of the canceling coil around the core does not affect or depend on the windings of other components, especially the vertical deflection coil, and the insulation between the vertical deflection coil and the canceling coil is also maintained. This can be done reliably by using an auxiliary bobbin, insulating means, etc., and is advantageous in terms of shape and performance. In addition, a canceling coil is wound in a toroidal manner around the unwound part of the vertical deflection coil in the core of the deflection yoke, which had never been considered before, increasing the range of application of the deflection yoke itself. I2 will become increasingly useful in the future, especially for video equipment compatible with high frequencies.

[Brief explanation of drawings]

FIG. 1 is a side view of one embodiment of the deflection yoke device of the present invention, FIG. 2 is a cross-sectional view taken along the line n--n in FIG. Similarly, FIG. 4 is an explanatory diagram showing the state of the magnetic field generated by the horizontal deflection coil and the cancellation coil. 2.3 horizontal tmm coil 4.5 vertical deflection coil 6 coil bobbin 7 deflection yoke body
8.9・Cancellation coil, Fig. 1 Fig. 3

Claims (1)

[Claims] 1. A core, a pair of saddle-shaped horizontal deflection coils wound around the inner surface of the core, a pair of toroidal vertical deflection coils wound around the outer periphery of the core, and a pair of toroidal vertical deflection coils wound around the outer periphery of the core; A deflection yoke body is constituted by a coil bobbin arranged to maintain insulation between the horizontal deflection coil and the vertical deflection coil, and a deflection yoke body is configured from a deflection yoke body in series with the horizontal deflection coil of the deflection yoke body. A deflection yoke device characterized in that a pair of canceling coils that generate a magnetic field opposite to a horizontal deflection magnetic field leaking to the outside are connected, and the canceling coils are wound around the core in a toroidal shape.