JPS63202826A - Deflecting yoke device - Google Patents

Abstract

PURPOSE:To reduce the unnecessary radiation from a yoke by providing unnecessary radiation countermeasure means generating the magnetic field opposite to the magnetic field leaking to the outside of a core among the horizontal deflecting magnetic filed generated by horizontal deflecting coils. CONSTITUTION:A deflecting yoke 7 is constituted of a core 1, horizontal deflecting coils 4, 5, and a coil bobbin 6. Unnecessary radiation countermeasure means 8, 9 are provided near the Y axis (vertical axis) of the yoke 7 on the outside of the yoke 7. The countermeasure means 8, 9 are constituted of multiple loop-shaped coils 8c, 9c and located nearly symmetrically in the peripheral direction centering the Y axis of the yoke 7. By providing such countermeasure means 8, 9, the magnetic field leaking to the outside of the core 1 (unnecessary radiation) among the horizontal deflecting magnetic field generated by the deflecting coils 2, 3 is reliably reduced almost over the whole periphery of the deflecting yoke 7 by the magnetic field generated by the countermeasure means 8, 9 and opposite to the unnecessary radiation.

Description

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

<Prior Art> As is well known, in a deflection yoke mounted on a cathode ray tube of a television receiver or a CRT display device, a horizontal deflection coil of 15.75 KHz or more and up to about 120 KHz is normally used. A vertical deflection current of around 60 Hz is supplied to the vertical deflection coils, 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, and the desired image is displayed on the screen. In this case, the horizontal deflection magnetic field,
Both the vertical deflection magnetic field produces a leakage magnetic field to the outside of the deflection meter (core). 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 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 toroidal or saddle-shaped vertical deflection filter wound along the inner surface of the core, and a horizontal deflection coil and a vertical deflection coil arranged on the inner surface of the core. A deflection yoke is constructed from a fill bobbin that maintains insulation between the coils and defines the position of each coil, and is positioned approximately symmetrically in the circumferential direction around the Y axis of the deflection yoke outside the deflection yoke. In addition, an unnecessary radiation countermeasure means consisting of at least a plurality of loop-shaped coils is provided, and a magnetic field opposite to the magnetic field leaking to the outside of the core among the horizontal deflection magnetic fields generated by the horizontal deflection coil is generated by the unnecessary radiation countermeasure means. It is what it is.

Function> An unnecessary radiation countermeasure means consisting of at least a plurality of loop-shaped fills is installed outside the deflection yoke so as to be substantially symmetrical in the circumferential direction around the Y-axis of the deflection yoke. Of the horizontal deflection magnetic field generated by the horizontal deflection fill, the magnetic field leaking to the outside of the core (unnecessary radiation) is
The unwanted radiation is reliably reduced over almost the entire circumference of the deflection yoke by a magnetic field opposite to the unwanted radiation generated by the unnecessary radiation countermeasure means.

<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 to 3, reference numeral 1 denotes an annular core formed by joining a pair of semi-annular cores, and a pair of saddle-shaped horizontal deflection coils 2.5 are wound around the inner surface of the core 1. , a pair of toroidal vertical deflection films 4.5 are wound around the outer periphery. 6 is arranged on the inner surface of the core 1 to maintain insulation between the horizontal deflection coil 2.6 and the vertical deflection filter 4.5, and the winter coil 2. B, the coil bobbin that defines the position of 4.5, and the deflection yoke 7 is formed by the core 1, the horizontal deflection filter 2°3, the vertical deflection coil 4.5, and the coil bobbin 6.
Configure. An unnecessary radiation countermeasure means 8.9 is provided outside the deflection yoke 7 and near the Y axis (vertical axis) of the deflection yoke 7. The unnecessary radiation countermeasure means 8.9, as shown in Fig. 4,
Consisting of a plurality of continuous loop-shaped coils 8C (9C), the deflection yoke 7 is arranged substantially symmetrically in the circumferential direction with the Y axis (vertical axis) of the deflection yoke 7 as the center.
Locked (locked) with the locking protrusion 1° provided on the coil bobbin 6.
The vertical deflection coil 4.5 is wound and fixed at a predetermined distance from the surface of the deflection yoke main body 7. Here, unnecessary radiation countermeasure means 8.
For example, as shown in FIG. 5, the coils 8C and 9C constituting the horizontal deflection coil 2.3 are connected in series to the horizontal deflection coil 2.3. A current that matches the horizontal deflection current supplied to No. 3 is supplied. And unnecessary radiation countermeasures 8.
Several continuous loop-shaped coils 8c and 9C of 9 cause a magnetic field (unnecessary It generates a magnetic field (cancelling magnetic field) that is opposite to radiation). Here, in this embodiment, the coils 8C and 9C of the unnecessary radiation countermeasure means 8 and 9 are 0.4
In the deflection yoke device having such a structure, the coils 8C, 9
The unnecessary radiation countermeasure means 8.9 consisting of C is positioned outside the deflection yoke 7 via the locking protrusion 10 so as to be substantially symmetrical in the circumferential direction about the Y axis (vertical axis) of the deflection meter 7. Make the specified wiring connections in the installed state. Thereafter, a predetermined 11 currents are applied to the horizontal deflection filters 2 and 6, the vertical deflection filter 4.5, and the coils 8C and 9C constituting the unnecessary radiation countermeasure means 8.9, respectively. With the application of current, the sixth
As shown in the figure, out of the horizontal deflection magnetic field HB generated by the horizontal deflection coil 2.3, the unnecessary radiation countermeasure means 8. The canceling magnetic field Hc generated by the canceling magnetic field Hc becomes a magnetic field in the opposite direction at the exit portion of the unnecessary radiation HH to the core 1 and around the inlet portion 9, and as a result, the unnecessary radiation HR is canceled by the canceling magnetic field Hc and is surely reduced. It is. Here, ■ and ■ in the figure indicate the direction of the current flowing through the coils 8C and 9C.

In one embodiment of the deflection yoke device of the present invention, the coil constituting the unnecessary radiation countermeasure means is formed by a plurality of continuous loop-shaped coils, but as shown in FIG. The fill 8C (9C) of the unnecessary radiation countermeasure means 8 (9) may be formed by combining the shaped fill A and the wide loop shaped coil B, and connecting the coils A and B appropriately. Similar to a plurality of continuous loop-shaped coils, unnecessary radiation is reduced. In addition, in one embodiment of the deflection yoke device of the present invention, the unnecessary radiation countermeasure means was described using three loop-shaped coils, but the number of loop-shaped coils can be changed as necessary. It is something that can be increased;
The unnecessary radiation countermeasure means was constructed only with a loop-shaped fill, but as shown in Fig. 8, a loop-shaped coil 8C (9C)
A magnetic piece 11 made of a toolite piece, a silicon steel plate, etc. is inserted into each or a part of the inside (in the case of the figure, only the central part),
In other words, the coils 8C-(9C) may be formed by winding them in a loop through the magnetic piece 11. In this case, the generation of the canceling magnetic field is more efficient than when only the fill is used, and the magnetic piece By using this method, unnecessary radiation can be reliably reduced even when the number of turns of the coil is reduced. Furthermore, in one embodiment of the deflection yoke device of the present invention, the coil constituting the unnecessary radiation countermeasure means is formed in a polygonal shape with respect to the deflection yoke. It may also be formed as a curved shape. Furthermore, in one embodiment of the deflection yoke device of the present invention, a vertical deflection coil is wound around the core in a toroidal shape. It is okay to do so. Furthermore, in one embodiment of the deflection yoke device of the present invention, it has been described that the unnecessary radiation countermeasure means are provided above and below the deflection yoke, but they may be arranged either above or below. In this case, it is necessary to not only reduce unnecessary radiation but also to make the entire device more compact.

This will reduce costs. Furthermore, in one embodiment of the deflection yoke device of the present invention, the coil constituting the unnecessary radiation countermeasure means was constructed by winding 10 turns of 0.4121 copper wire, but the diameter of the copper wire, the number of turns, etc. It is not limited to the examples, and can be changed/increased/decreased as appropriate in relation to the impedance of the horizontal deflection coil. Alternatively, instead of the copper wire, the coil may be constructed using, for example, a vinyl-coated lead wire in which the outer periphery of the copper wire is coated with an insulating material. In one embodiment of the present invention, the coil of the unnecessary radiation countermeasure means is connected in series with the horizontal deflection coil, but the coil may be connected in parallel with the horizontal deflection coil. is a separate tlJ that supplies the same current as the horizontal deflection current without being connected 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, a magnetic field is generated by an unnecessary radiation countermeasure means consisting of at least a plurality of loop-shaped coils located outside the deflection yoke (core) so as to be approximately symmetrical in the circumferential direction about the Y-axis of the deflection yoke. (Cancelling magnetic field) forms a magnetic field that leaks outside the core in the horizontal deflection magnetic field, that is, a magnetic field opposite to unnecessary radiation.As a result,
Unwanted radiation is reduced almost all around the deflection yoke (top and bottom).

[in the left and right directions], and there is no need to worry about causing malfunctions in other models (combi, evening terminals, etc.) that are close to the deflection yoke, having a negative impact on the human body, or causing disturbances in the video signal. It is something. In addition, there is no need to place any undesirable radiation countermeasures inside the core (deflection yoke), which effectively acts on unnecessary radiation and has almost no effect on the main deflection magnetic field inside the core. It does not adversely affect the characteristics (landing, convergence, deflection distortion). As described above, the deflection yoke device of the present invention has a moderate effect and will become more and more effective in the future, especially for use in video equipment compatible with high frequencies.

[Brief explanation of the drawing]

FIG. 1 is a side view of an embodiment of the deflection yoke device of the present invention, FIG. 2 is a top view, FIG. 6 is a sectional view taken along line I-1 in FIG. 1, and FIG. 4 is a side view of an embodiment of the deflection yoke device of the present invention. FIG. 5 is an explanatory diagram of the winding state of the loop-shaped coil constituting the unnecessary radiation countermeasure means in one embodiment. FIG.
The figure is an explanatory view seen from the head side of the deflection yoke, showing the state of the magnetic field generated by the horizontal deflection coil and the unnecessary radiation countermeasure means, and FIG. 7 is an unnecessary radiation countermeasure means in another embodiment of the deflection yoke device of the present invention. FIG. 8 is a top view of the structure of the unnecessary radiation countermeasure means. 1...Core, 2.3.Horizontal deflection coil, 4.5...
Vertical deflection coil, 6... Coil bobbin, 7... Deflection yoke, 8.9... Unwanted radiation countermeasure means, 8C, 9C.
・Loop-shaped coil,

Claims (1)

[Claims] A core, a pair of saddle-shaped horizontal deflection coils and a toroidal or saddle-shaped vertical deflection coil wound along the inner surface of the core, and the horizontal deflection coil and the vertical deflection coil arranged on the inner surface of the core. A deflection yoke is constructed from a coil bobbin that maintains insulation between the coils and defines the position of each coil, and the coil bobbin is positioned outside the deflection yoke so as to be approximately symmetrical in the circumferential direction about the Y axis of the deflection yoke. In addition, an unnecessary radiation countermeasure means consisting of at least a plurality of loop-shaped coils is provided, and a magnetic field opposite to the magnetic field leaking to the outside of the core out of the horizontal deflection magnetic field generated by the horizontal deflection coil is provided as the unnecessary radiation countermeasure means. A deflection yoke device characterized in that it is generated by.