JPS6313244A - Deflection yoke device - Google Patents

Abstract

PURPOSE:To decrease needless radiation fields out of horizontal-deflection magnetic fields without bad effects on screen characteristics, by making an auxiliary bobbin, around which a pair of cancel coils are wound, mounted/fixed in horizontal deflection coils. CONSTITUTION:Definite currents are conducted in horizontal deflection coils 2 and 3, vertical deflection coils 4 and 5, cancel coils 8 and 9, respectively. Then, cancel magnetic fields HC generated by the cancel coils 8 and 9, which are mounted/fixed nearly on the periphery of the horizontal deflection coils 2 and 3 through an auxiliary bobbin 10 and formed nearly in saddle shapes, are formed in the direction opposite to needless radiation fields HR, which leak outside from the deflection yoke 7 itself, out of the horizontal-deflection magnetic fields HB generated by the horizontal deflection coils 2 and 3. Thus, the needless radiation fields HR are partially cancelled by the cancel magnetic fields HC and decreased.

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, 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 CR'l'' display device, the frequency of the horizontal deflection coil is usually 15.75 KHz.
horizontal deflection current of 60H for the vertical deflection coil.
A vertical deflection current of z is supplied, and the electron beam is deflected by a predetermined amount using the horizontal deflection magnetic field and vertical deflection magnetic field generated from each deflection coil to obtain a desired image on the screen.
In this case, both the horizontal deflection 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 G 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 However, no measures were taken to reduce the external leakage magnetic field using the deflection yoke itself.

In recent years, however, video equipment has become more diverse, with high-frequency compatible terminal equipment such as conbeaters being placed close to the cathode ray tube to which the deflection yoke is attached. Among the leakage magnetic fields, there is a concern that the external leakage magnetic field of the high-frequency horizontal deflection magnetic field becomes unnecessary radiation and has an adverse effect such as causing malfunctions in other devices such as terminal equipment. There is a growing demand for reducing unnecessary radiation.

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 case of a 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 not required because of the characteristics. (
External leakage magnetic field) forms another deflection magnetic field, which improves the screen characteristics (landing).

There was a problem in that it had an adverse effect on convergence and 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 other models near the deflection yoke, or it may cause disturbances in the video signal and disrupt normal image characteristics. There was a problem that it had an adverse effect such as not being able to obtain the desired results.

<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 and a pair of toroidal or saddle-shaped vertical deflection coils wound along the core, and insulation between the horizontal deflection coil and the vertical deflection coil arranged on the inner surface of the core. The deflection yoke body is composed of the coil bobbin to be held, and the coil bobbin of the deflection yoke body is composed of a front annular part, a rear annular part, and a pair of diagonally located connecting parts connecting both the annular parts. Attach an auxiliary bobbin with a groove formed on the
A pair of canceling coils that generate a magnetic field opposite to the horizontal deflection magnetic field that leaks to the outside from the deflection yoke body generated by the horizontal deflection coil are inserted into the grooves of the auxiliary bobbin and formed into a roughly hollow shape, and are attached to the deflection yoke body. 〇Work〉 A pair of canceling coils are attached to the coil bobbin using an auxiliary bobbin, and are inserted into the groove of the auxiliary bobbin to close the front end enlarged part and the rear end enlarged part of the coil bobbin. It is located on the outer circumferential surface and back of the deflection yoke body and is formed into a roughly hollow shape and is attached and fixed to the deflection yoke body to prevent horizontal deflection that leaks to the outside from the deflection yoke body caused by the horizontal deflection coil. Unnecessary radiation of the magnetic field can be reduced by a predetermined amount 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. A pair of saddle-shaped horizontal deflection coils 2.3 are wound around the inner surface of the core 1, and a pair of toroidal-shaped vertical deflection coils are wound around the outer periphery. A coil 4.5 is wound. 6 is a coil bobbin arranged on the inner surface of the core 1 to maintain insulation between the horizontal deflection coil 2.3 and the vertical deflection coil 4.5;
, the horizontal deflection coil 2.3, the vertical deflection coils 4 and 5, and the coil bobbin B constitute the deflection yoke main body 7. The horizontal deflection coil 2.3 forming part of the deflection yoke body 7 includes:
As shown in FIG. 3, a pair of cancellation coils 8.9 are connected in series to the horizontal deflection coil 2.3. The cancel coil 8°9 generates a magnetic field opposite to the horizontal deflection magnetic field leaked to the outside from the deflection yoke body 7 generated by the horizontal deflection coil 2.6, and is attached to the deflection yoke body 7 via an auxiliary bobbin 10. Fixed. Auxiliary bobbin 1
0 is a front annular portion disposed along the outer circumferential surface 6a1 of the front end enlarged portion 6a of the coil bobbin 6 which forms a part of the deflection yoke main body 7, as shown in FIG. 'J10a, the outer circumferential surface 6b1 and the back surface 6b2 of the enlarged rear end portion 6b of the coil bobbin 6.
A diagonal position connecting the rear annular part 10b disposed along the front annular part 10b and the front annular part 10a and the rear annular part 10b disposed outside the deflection yoke main body 7, that is, on the outside of the core 1. It consists of a pair of connecting parts 10C and 10d,
It is attached and fixed to the coil bobbin B by appropriate means such as binding or adhesion. Front annular portion 10 of auxiliary bobbin 10
a, the rear annular portion 10b has a groove portion 11 having a substantially U-shaped cross section, and the groove portion 11 has a substantially U-shaped cross section toward the outer circumference in the front annular portion 10a, and toward the rear, side, outer circumference, side, and rear in the rear annular portion 10b. The connecting portions 10C and 10d are each formed with a groove portion 12 having a substantially U-shaped cross section toward the outside. The canceling coils 8.9 are inserted into the grooves 11.12 of the auxiliary bobbin 10, and are arranged on the coil bobbin 6 corresponding to the winding position of the horizontal deflection coil 2.3.
horizontal deflection coil 2.3 housed within the front end enlarged portion 6a of the
Front end crossing Ma2a.

In the portion 3a, the front end connecting wire 2a is located on the outer periphery of the portion 3a using the front annular portion 10a, and the horizontal deflection coil 2
．． 6 (not shown), connecting portions 10C, 1
In the rear end crossing M2b, 3b portion of the horizontal deflection coil 2.3 located outside the core 1 (the two deflection yoke bodies 7) and housed in the rear end enlarged part 6b of the coil bobbin 6 using Using the rear annular portion 10b, the rear end crossover wires 2b, 3
It is located on the outer periphery and rear surface of portion b, and is fixedly attached to the deflection yoke main body 7 in a state where it is finally formed into a substantially hollow shape. Here, in this example,
The cancel coil 8.9 is constructed by using 5 turns of 0.4+25 copper wire twisted together.Also, the cancel coil 8.9 is constructed by forming the coil into a substantially hollow shape in advance and attaching it to an auxiliary bobbin. 10 may be inserted into the groove 11.12 formed on the auxiliary bobbin 10 and fixed, or the coil may be directly wound on the auxiliary bobbin 10 using the groove 11.12 of the auxiliary bobbin 10. The canceling coil 8.9 may be wound to form a substantially hollow shape, and the method of winding the canceling coil 8.9 around the auxiliary bobbin 10 can be selected arbitrarily.

In the deflection yoke device having such a configuration, the horizontal deflection coils 2, 3 . Vertical deflection coil 4.5, cancellation coil 8.
A predetermined current is applied to each of 9. At this time, as shown in FIG. 5, out of the horizontal deflection magnetic field HB generated by the horizontal deflection coil 2.3, unnecessary radiation HR leaking from the deflection yoke body 7 to the outside is deflected by horizontal deflection through the auxiliary bobbin 10. Full 1.2. The canceling magnetic field Hc generated by the canceling coil 8.9, which is located approximately on the outer periphery of B and is formed into a substantially hollow shape and is fixed, becomes a magnetic field in the opposite direction.
Part of the unnecessary radiation HR is canceled out and reduced by the canceling magnetic field He. That is, as shown in FIG. 6, the center point of the horizontal deflection coil 2.3, that is, the deflection yoke body 7
The horizontal deflection magnetic field (HB
) The unnecessary radiation (HR) of 28 dB without the canceling coil 8.9 is reduced by about 60% to 20 dB by installing the canceling coil 8.9 and adding a canceling magnetic field (Hr). It is.

Here, in FIG. 5, ■ and O indicate the direction of the current flowing through the canceling coil 8.9.

In one embodiment of the deflection yoke device of the present invention, the front annular portion forming a part of the auxiliary bobbin for winding the cancel coil is disposed along the outer peripheral surface of the enlarged front end portion of the coil bobbin, and the cancel coil is As shown in FIGS. 7 and 8, the front annular portion of the auxiliary bobbin 10 is wound around the front end crossover portion of the horizontal deflection coil. 10a may be arranged along the back surface 6a2 of the front end enlarged portion 6a of the coil bobbin 6. In this case, the canceling coil 8.9 is arranged at the front end connecting wires 2a, 33 of the horizontal deflection coils 2, 3.
The front annular portion 10a is used to wind the front end connecting wire 2a, located on the back side of the 38 portion, and in such a configuration, unnecessary radiation can be reduced in the same way as in the above-mentioned embodiment. It is. Also, regarding the timing of winding the cancel coil on the auxiliary bobbin, it may be done in advance before the auxiliary bobbin is attached to the coil bobbin, or
This can be done after the auxiliary bobbin is attached to the coil bobbin, and can be set arbitrarily.The formation direction of the groove provided on the auxiliary bobbin also allows for efficient winding of the cancellation coil, and allows for vertical deflection of the cancellation coil. The direction is not limited to that of the embodiment as long as insulation from the coil can be maintained well. Further, in one embodiment of the deflection yoke device of the present invention, a vertical deflection coil is wound around the core in a toroidal manner.
The vertical deflection coil may be formed into a hollow shape and wound. Furthermore, in this embodiment, the cancellation coil is constructed using five turns of five stranded copper wires of 0.4z, but the number of wire diameters of the copper wires is one.

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.Furthermore, the copper wires may be bundled without being twisted and wound with a pie 7 airer. Good wire diameter, for example 0.5ρ
When using a copper wire of ~1.0 g3, it may be constructed by simply using several turns instead of twisting or bundling a plurality of wires. Further, in one embodiment of the deflection yoke device of the present invention, the canceling coil is connected in series to the horizontal deflection coil, but it may also be configured to be connected in parallel to the horizontal deflection coil. Alternatively, it may be constructed by connecting to a separate power source that supplies the same current as the horizontal deflection current, without connecting it to the horizontal deflection coil.

<Effects of the Invention> The deflection yoke device of the present invention has been described in detail above, and produces the following effects.

In other words, the magnetic field generated by the canceling coil fixed to the deflection yoke body via the auxiliary bobbin forms a magnetic field opposite to the horizontal deflection magnetic field leaking from the deflection yoke body to the outside.As a result, the screen characteristics ( Landing, convergence, deflection distortion), the unnecessary radiation of the horizontal deflection magnetic field is reliably reduced without adversely affecting the deflection yoke.
This eliminates concerns about malfunctions or disturbances in video signals. In addition, an auxiliary bobbin with a cancellation coil attached to the coil bobbin is inserted into a groove formed in the auxiliary bobbin and fixed to the deflection yoke body, thereby providing insulation between the cancellation coil and the vertical deflection coil. At the same time, accidents such as contact between the cancel coil and other parts (tightening screws, etc.) can be prevented.In addition, by setting the direction in which the groove is formed as shown in the example, the cancel coil can be kept in good condition. In a device in which the coil is pre-formed into a substantially hollow shape and is fixed to the auxiliary bobbin, the insertion work of the cancellation coil into the groove can be done efficiently and the cancellation coil can be reliably prevented from falling out of the groove after insertion. It is something that Furthermore, the mounting position of the canceling coil to the deflection yoke body is reliably fixed at a fixed location for many years, and stable characteristics can be maintained without variation in the rate of reduction of unnecessary radiation. It is. Furthermore, the deflection yoke itself is equipped with a canceling coil to reduce unnecessary radiation via an auxiliary bobbin, which was completely unthinkable in the past.
The scope of application of the deflection yoke itself has increased significantly, and it is extremely promising in the future, especially for use in video equipment that supports 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 rear view, Fig. 3 is a circuit diagram showing the connection state between the horizontal deflection coil and the cancellation coil, and Fig. 4 is the same. FIG. 5 is a perspective view of the auxiliary bobbin, FIG. 5 is an explanatory diagram showing the state of the magnetic field generated by the horizontal deflection coil and canceling coil, FIG. 6 is a schematic explanatory diagram of an example of measuring unnecessary radiation, and FIG. A side view of another embodiment of the deflection yoke device of the present invention, and FIG. 8 is a rear view as well. 1...Core, 2.3...Horizontal deflection coil, 4.5.
...Vertical deflection coil, 6... Coil bobbin, 6a...
・Front end enlarged part, 6a1... Front end enlarged part outer peripheral surface, 6
a2... Back side of the enlarged rear end part, 6b... Enlarged rear end part, 6b1... Outer peripheral surface of the enlarged rear end part, 6b2... Back side of the enlarged front end part, 7... Deflection yoke body , 8.9...
Cancellation coil 10... Auxiliary bobbin, 10a...
- Front annular part, 10b... Rear annular part, 10C,
10d...Connection part, 11.12...Groove part,

Claims (1)

[Scope of Claims] 1. A core, a pair of saddle-shaped horizontal deflection coils wound along the core, and a pair of toroidal or saddle-shaped vertical deflection coils arranged on the inner surface of the core, A deflection yoke body is composed of a coil bobbin that maintains insulation between a horizontal deflection coil and a vertical deflection coil, and a diagonal shape that connects a front annular portion, a rear annular portion, and both annular portions to the coil bobbin of the deflection yoke main body. A pair of connecting parts located at the horizontal deflection coil, each of which is equipped with an auxiliary bobbin having a groove formed therein, and which generates a magnetic field opposite to the horizontal deflection magnetic field leaked to the outside from the deflection yoke body generated by the horizontal deflection coil. A deflection yoke device characterized in that each of the cancellation coils is inserted into a groove of the auxiliary bobbin to form a substantially hollow shape, and is fixedly attached to the deflection yoke main body. 2. The front annular part of the auxiliary bobbin is arranged along the outer circumferential surface of the enlarged front end part of the coil bobbin, the rear annular part is arranged along the outer circumferential surface and the back surface of the enlarged rear end part of the coil bobbin, and the connecting part 2. The deflection yoke device according to claim 1, wherein the deflection yoke device is located outside the deflection yoke main body. 3. The front annular part of the auxiliary bobbin is arranged along the back surface of the enlarged front end part of the coil bobbin, the rear annular part is arranged along the outer peripheral surface and the back face of the enlarged rear end part of the coil bobbin, and the connecting part is arranged. 2. The deflection yoke device according to claim 1, wherein the deflection yoke device is located outside the deflection yoke main body.