JPS62213047A - Deflection yoke device - Google Patents

Abstract

PURPOSE:To reduce the unnecessary radiation of horizontal deflecting magnetic field of the main deflecting coil at a specific amount with the magnetic field of the auxiliary deflecting coil inverse to the horizontal deflecting magnetic field, by making the auxiliary deflecting coil of several turns at the position of the end of the winding of the horizontal deflecting coil independent from the main deflecting coil through a tap, and in an inverse connection. CONSTITUTION:A pair of horizontal deflecting coils 2 and 3 which compose a part of a deflection yoke main body 7, are composed of the auxiliary deflecting coils 2S(3S) of several turns at the positions of the ends of windings, that is, at the positions continuous around the peripheries from the bottom of the longer sides 2a(3a) to the front side crossing wire parts 2b(3b) and the rear side crossing parts 2c(3c), and the main deflecting coils 2M(3M) other than the auxiliary coils 2S(3S). The auxiliary deflecting coils 2S(3S) are independent from the main deflecting coils 2M(3M) through taps T, and connected inversely to the main deflecting coils 2M(3M). Therefore, magnetic fields are generated by the auxiliary deflecting coils 2S(3S) reverse to those by the main deflecting coils 2M(3M).

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 of a television receiver, CRT display device, etc., a horizontal deflection current of 15.75 KHz is normally supplied to a horizontal deflection coil. , 5QHz for vertical deflection coil
The device supplies a vertical deflection current of Both the magnetic field and the vertical deflection magnetic field produce leakage magnetic fields to the outside of the deflection yoke. 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, it has recently been Until now, no measures had been taken to reduce the external leakage magnetic field using the deflection yoke itself.

In contrast, in recent years, video equipment has become more diverse, such as placing high-frequency terminal equipment such as computers in close proximity 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 conventional deflection yoke in which a shield plate is provided to surround the outer periphery, there is a problem that the shield plate becomes large in size, and the shield plate is not required due to its characteristics. radiation(
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, other models that are close to the deflection yoke, especially those compatible with high frequencies, may malfunction 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 pair of horizontal deflection coils are wound around the core in a saddle shape, each consisting of a sub-deflection coil of several turns located at the end of the winding, and a main deflection coil other than the sub-deflection coil. The horizontal deflection magnetic field generated by the main deflection coil is made independent through a tap, and connected in reverse, so that the sub-deflection coil generates a magnetic field opposite to the horizontal deflection magnetic field generated by the main deflection coil, and the magnetic field of the sub-deflection coil reduces unnecessary radiation of the horizontal deflection magnetic field. This is what happens.

<Operation> A sub-deflection coil with several turns located at the end of the winding of the horizontal deflection coil is made independent from the main deflection coil via a tap, and is connected in reverse.The horizontal deflection generated by the main deflection coil Unnecessary radiation of the magnetic field can be reduced by a predetermined amount using a magnetic field opposite to the horizontal deflection magnetic field generated by the sub-deflection 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 and 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. A coil bobbin 6 is arranged on the inner surface of the core 1 and maintains insulation between the horizontal deflection coils 2 and 3 and the vertical deflection coils 4 and 5.
, the horizontal deflection coils 2 and 3, the vertical deflection coils 4 and 5, and the coil bobbin 6 constitute a deflection yoke main body 7. A pair of horizontal deflection coils 2 and 3 forming part of the deflection yoke body 7
are shown in Figures 3 and 4, respectively (where,
In FIGS. 3 and 4, only one horizontal deflection coil 2 is shown, but the same applies to the horizontal deflection coil 3.)
, from the winding end side, that is, the bottom of the longitudinal portion 2a (3a) (the opposing joining side of the pair of horizontal deflection coils 2 and 3) to the outer periphery of the front end connecting wire portion 2b (3b) and the rear end connecting wire portion 2c (3c) Sub-deflection coil 2S (3S) with several turns located continuously in
and the main deflection coil 2M excluding the sub-deflection coil 2S (3S)
(3M), and the sub-deflection coil 2
S (3S) is for the main deflection coil 2M (3M),
As shown in FIG. 5, it is connected independently to the main deflection coil 2M (3M) through a tap T (the winding end F2 of the sub-deflection coil 2S (3S) is connected to the main deflection coil 2M (3M)).
3M)) and the sub-deflection coil 2S).
(3S) generates a magnetic field opposite to the horizontal deflection magnetic field generated by the main deflection coil 2M (3M).

In the deflection yoke device having such a configuration, a predetermined current is applied to each of the horizontal deflection coils 2 and 3 and the vertical deflection coil 4.5. At this time, in the horizontal deflection coils 2 and 3, a normal pin-shaped horizontal deflection magnetic field is generated by the main deflection coils 2M and 3M, and at the same time, a magnetic field opposite to the horizontal deflection magnetic field is generated by the sub-deflection coils 2S and 3S. do. This sub-deflection coil 2S.

The magnetic field opposite to the horizontal deflection magnetic field generated by 3S is generated by the horizontal deflection magnetic field because some of the winding positions of the sub-deflection coils 2S and 3S are located on the outer periphery of the front end/rear end connecting wire portions 2b, 3b, 2c, and 3c. Among the deflection magnetic fields, this field mainly serves as a canceling magnetic field for unnecessary radiation leaking to the outside from the front and rear end crossovers 2b, 3b, 2c, and 3c of the horizontal deflection coils 2 and 3, and eliminates unnecessary radiation of the horizontal deflection magnetic fields. is partially canceled out and reduced. Here, a part of the horizontal deflection magnetic field generated by the main deflection coils 2M and 3M is in the longitudinal portion 2a.

It is canceled by the influence of the reverse magnetic field generated by the sub-deflection coils 2S and 3S located at the bottom of 3a, and the pin-shaped horizontal deflection magnetic field becomes barrel-shaped (the deflection efficiency decreases), but the coil distribution By strengthening the bottle magnetic field, the influence of the reverse magnetic field can be removed, and even if a sub-deflection coil is provided, no problem will arise in terms of deflection characteristics.

In one embodiment of the deflection yoke device of the present invention, the vertical deflection coil is wound around the core in a toroidal manner, but the vertical deflection coil may also be wound in a hollow shape. It is.

In addition, the winding end side in the present invention means the bottom of the longitudinal part of the horizontal deflection coil wound in a saddle shape (the opposing joining side of a pair of horizontal deflection coils) and the outer periphery of the front end and rear end crossover wire parts. Therefore, even if these portions are located on the winding start side during the winding operation, they are included in the present invention.

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

In other words, the few turns at the end of the horizontal deflection coil wound in a saddle shape are made independent from the main deflection coil via taps as a sub-deflection coil, and are connected in the opposite direction to the main deflection coil. This is a deflection coil that generates a magnetic field opposite to the horizontal deflection magnetic field generated by the main deflection coil.It does not require any changes in shape as a deflection yoke, and has an extremely simple configuration that eliminates unnecessary radiation of the horizontal deflection magnetic field (especially Unwanted radiation generated from the front and rear crossover portions of the horizontal deflection coil is reliably reduced, preventing malfunctions in other devices (such as computer terminals) that are close to the deflection yoke, and disturbances in video signals. This eliminates any concerns that may arise. In addition, the deflection yoke (horizontal deflection coil) itself is equipped with a means to reduce unnecessary radiation, which was completely unthinkable in the past, and the range of applications of the deflection yoke itself has been significantly increased, especially for high-frequency video equipment. This is extremely promising for the future.

[Brief explanation of drawings]

Fig. 1 is a partially sectional side view of an embodiment of the deflection yoke device of the present invention, Fig. 2 is a front view, Fig. 3 is a perspective view of the horizontal deflection coil, and Fig. 4 is a side view of the horizontal deflection coil. Similarly, FIG. 5 is a configuration wiring diagram of the horizontal deflection coil. 1... Core, 2, 3... Horizontal deflection coil, 2M, 3
M...Main deflection coil, 2S, 3S...Sub deflection coil, T...Tap,

Claims (1)

[Claims] A pair of horizontal deflection coils are wound around the core in a hollow shape, each consisting of a sub-deflection coil of several turns located at the end of the winding, and a main deflection coil other than the sub-deflection coil, with the sub-deflection coil being the main deflection coil. The sub-deflection coil is made independent of the deflection coil through a tap and connected in reverse, so that the sub-deflection coil generates a magnetic field opposite to the horizontal deflection magnetic field generated by the main deflection coil, and the magnetic field of the sub-deflection coil causes the horizontal deflection to be A deflection yoke device characterized by reducing unnecessary radiation of magnetic fields.