JPH06131992A - Deflection yoke device - Google Patents

Abstract

PURPOSE:To suppress the leakage magnetic field around a display device on good balance by winding a cancel coil behind a deflection coil device to minimize the leakage magnetic field. CONSTITUTION:A horizontal deflection coil 5 generates the leakage magnetic field 6b behind. The number of turns of cancel coils 4 is adjusted, and the cancel magnetic field 7b is generated to minimize the leakage magnetic field 6b. One or both of the cancel coils 4 may be inclined. When only one cancel coil 4 is inclined, the leakage magnetic field is measured, then the tilt angle and the number of turns of the other cancel coil can be determined.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a deflection yoke device mounted on a cathode ray tube such as a television receiver or a display device.

[0002]

2. Description of the Related Art In recent years, particularly in a display device, it has been pointed out that the leakage magnetic field from the deflection yoke becomes unnecessary radiation and adversely affects the human body, and it is required to suppress the leakage magnetic field below a certain standard. Is starting to appear.

In order to reduce the leakage magnetic field generated from such a deflection yoke device, for example, Japanese Patent Laid-Open No. 63-64250.
As disclosed in Japanese Unexamined Patent Publication (H01J29 / 76), a core and a pair of saddle-shaped horizontal deflection coils and a saddle-shaped vertical deflection coil wound along the inner surface of the core are provided. There is a configuration in which a leakage coil generated from the horizontal deflection coil is canceled by connecting a cancellation coil to the deflection coil.

[0004]

However, in the above-mentioned conventional deflection yoke device, unnecessary radiation in the front of the display device is effective, but no consideration is given to unnecessary radiation in the rear of the display device. There is a problem not.

[0005]

In order to solve the above-mentioned problems, according to the present invention, a horizontal deflection coil and a paddle-shaped vertical deflection coil wound along the inner surface of a core, and a leakage magnetic field from the horizontal deflection coil. In a deflection yoke device having a cancel coil for canceling the above, the cancel coil is wound with a minimum number of turns behind the deflection coil device. .

[0006]

With the above construction, the leakage magnetic field around the display device is reduced.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 shows the appearance of the deflection yoke device of the present invention. In the figure, reference numeral 1 indicates a deflection yoke device body. Reference numeral 2 is a vertical deflection coil, 3 is a coil separator, and 4 is a pair of cancel coils mounted on the coil separator. The cancel coil 3 is electrically connected to a horizontal deflection coil (not shown).

Next, FIG. 2 is a diagram showing the distribution state of the leakage magnetic field of the deflection yoke device. In the figure, reference numeral 5 indicates a horizontal deflection coil. 6a is the horizontal deflection coil 5
Represents the leakage magnetic field on the opening side (front side) where
b represents the leakage magnetic field on the neck side (rear side) generated by the horizontal deflection coil 5. These leakage magnetic fields are canceled by the canceling coil 4 on the opening side (front side).
And a neck side (rear side) canceling magnetic field 7b is generated to cancel it.

FIG. 3 is a graph showing the relationship between the number of windings of the cancel coil 4 and the leakage magnetic field at the front (0 °) and rear (180 °) measurement positions of the display device based on the MPR standard. As can be seen from this graph, as the number of windings of the cancel coil 4 increases, the leakage magnetic field gradually decreases at the measurement position in front of the display device, while at the measurement position behind the display device. It can be seen that there is a characteristic that the number of turns decreases up to a certain number of turns (around 23 to 24 turns in this measurement value), but increases beyond this. This is because the leakage magnetic field 6b on the neck side of the horizontal deflection coil is small, so that the leakage magnetic field on the neck side is canceled by a smaller number of windings than on the opening side, and the leakage magnetic field 6a from the opening side is canceled. Therefore, as the number of windings of the cancel coil 4 is increased, the leakage magnetic field 6a on the opening side is reduced, but the leakage magnetic field 6b on the neck side is rather increased. Therefore, in order to minimize the leakage magnetic field around the display device in a well-balanced manner, the number of windings of the cancel coil is set so that the value of the leakage magnetic field at the measurement position behind the display device is the minimum, that is, In this embodiment, it may be 23 to 24 turns. in this way,
By determining the number of turns of the cancel coil so that the value of the leakage magnetic field behind the display device is minimized,
The value of the leakage magnetic field around the display device can be minimized. The inclination angle θ (see FIG. 2) of the cancel coil 4 at this time was 30 °.

Further, FIG. 4 is a graph showing the relationship between the inclination angle θ of the cancel coil (see FIG. 2) and the leakage magnetic field. As can be seen from FIG. 4, the CR of the display device
Cancel coil 4 with respect to the axis T of T (see FIG. 2)
It is effective to mount it at an angle of θ = 25 ° to 35 °. By thus tilting the cancel coil 4, the direction of the leakage magnetic field and the canceling magnetic field of the cancel coil 4 are substantially the same, and the directions are opposite to each other, so that the canceling effect is increased. In this embodiment, as described above, the inclination angle θ is 25 ° to 30 °.
You can see that you can set it to °. The number of turns of the cancel coil 4 at this time was 30 turns.

Further, both of the cancel coils 4 may be tilted, or only one of them may be tilted (depending on the arrangement of other parts in the display device), and when only one of them is tilted, The leakage magnetic field may be measured to determine the tilt angle of the other cancel coil and the number of turns of each cancel coil.

[0012]

As described above in detail, according to the present invention, the horizontal deflection coil and the paddle-shaped vertical deflection coil wound along the inner surface of the core, and the leakage magnetic field from the horizontal deflection coil are canceled out. In the deflection yoke device including the cancel coil, the cancel coil is wound with the minimum number of turns behind the deflection coil device, so that the leakage magnetic field around the display device can be suppressed in a well-balanced manner.

[Brief description of drawings]

FIG. 1 is a side view showing an appearance of a deflection yoke device of the present invention.

FIG. 2 is a diagram showing a relationship between a leakage magnetic field and a canceling magnetic field.

FIG. 3 is a graph showing the relationship between the number of turns of the cancel coil and the leakage magnetic field.

FIG. 4 is a graph showing a relationship between a tilt angle of a cancel coil and a leakage magnetic field.

[Explanation of symbols]

 1 Deflection Yoke Device 2 Vertical Deflection Coil 3 Coil Separator 4 Cancellation Coil 5 Horizontal Deflection Coil 6a Leakage magnetic field on the opening side 6b Leakage magnetic field on the neck side 7a Canceling magnetic field on the opening side 7b Canceling magnetic field on the neck side

Claims (1)

[Claims] 1. A deflection yoke device comprising a horizontal deflection coil and a vertical deflection coil wound along an inner surface of a core, and a cancel coil for canceling a leakage magnetic field from the horizontal deflection coil. The deflection yoke device is characterized in that the coil is wound a minimum number of turns behind the deflection coil device.