JPH065228A - Deflection device - Google Patents

Abstract

PURPOSE:To provide a light-weight, low-cost deflection device which efficiently prevents a leakage magnetic field by using a leakage magnetic field cancelling unit formed of resin compact containing a specified amount of magnetic powder. CONSTITUTION:A leakage magnetic field cancelling unit 13 that a coil 15 of plural turns is given to a magnetic core 14 formed of resin compact containing 50wt.% or more magnetic powder is arranged in front of a deflection yoke core 1 so that a magnetic field counter to a leakage magnetic field given from a horizontally deflection coil 11 can be formed. The coil 15 is connected to the horizontally deflection coil 11 to carry part or all of a current thereto. In this way, the magnetic field counter to the leakage magnetic field given from the horizontally deflection coil 11 is formed to cancel the leakage magnetic field. At this time, because the magnetic powder is insulated with resin, no overcurrent loss occurs and the leakage magnetic field is efficiently cancelled. The magnetic core 14 can be accurately faced to the direction of the leakage magnetic field in an easily adjustable manner and so the leakage magnetic field is almost all cancelled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflection device used in a CRT display.

[0002]

2. Description of the Related Art FIG. 3 is a perspective view showing a deflection device for a conventional CRT display. In the figure, reference numeral 1 denotes a deflection yoke core, in which a horizontal deflection coil is arranged on a horizontal side wall and a vertical deflection coil is arranged on a vertical side wall, but the illustration is omitted. 2 is a large circular core provided on the front surface of the deflection yoke core 1 and 3 is the circular core 2
The coil is wound around, and a part or all of the current of the horizontal deflection coil is made to flow and is connected so as to form a reverse magnetic field with respect to the leakage magnetic field of the horizontal deflection coil.

In the conventional deflection device configured as described above, a reverse magnetic field is generated in the coil 3 by causing a part or all of the current of the horizontal deflection coil wound around the deflection yoke core 1 to flow in the coil 3. Thus, of the magnetic fields generated by the horizontal deflection coil, unnecessary leakage magnetic fields are canceled.

[0004]

However, in such a conventional deflection device, in order to prevent a leakage magnetic field,
It is necessary to use a large-sized thin magnetic ring having a diameter of 150 mm or more as the circular core 2, which causes problems such as a large weight and a high cost.

The present invention has been made in order to solve the above-mentioned problems, and an object thereof is to obtain a deflecting device which is light in weight and low in cost and which can effectively prevent a leakage magnetic field.

[0006]

The present invention is the following deflection device. (1) A deflection device in which a leakage magnetic field canceling device made of a resin molded body containing 50% by weight or more of magnetic substance powder is arranged on the front surface of a deflection yoke core so as to form a reverse magnetic field against the leakage magnetic field of the horizontal deflection coil. . (2) A leakage magnetic field canceling device in which a magnetic core made of a resin molded body containing 50% by weight or more of magnetic substance powder is wound multiple times to form a reverse magnetic field against the leakage magnetic field of the horizontal deflection coil. And a deflection device connected to the front surface of the deflection yoke core so that a part or all of the current of the horizontal deflection coil can flow. (3) A deflection magnetic field canceling device, which is made of a resin molding containing 50% by weight or more of magnetic substance powder and is integrated with a winding separator, forms a reverse magnetic field with respect to the leakage magnetic field of the horizontal deflection coil. Deflection device placed in front of the.

[0007]

In the deflection device according to the first aspect of the present invention, the leakage magnetic field is canceled because the leakage magnetic field canceling device forms an inverse magnetic field with respect to the leakage magnetic field of the horizontal deflection coil. Resin molded products containing 50% by weight or more of magnetic powder have a magnetic permeability of 10 or more, and since each magnetic powder is insulated by resin, there is no eddy current loss, which is a problem at high frequencies, and leakage is efficient. Cancel the magnetic field.

In the deflection device according to the second aspect of the present invention, the reverse magnetic field is formed with respect to the leakage magnetic field by causing the current from the horizontal deflection coil to flow through the winding of the leakage magnetic field canceling device, and is generated by the horizontal deflection coil. The leakage magnetic field that occurs is canceled.

In the deflection device according to the third aspect of the present invention, the leakage magnetic field canceling device integrated with the winding separator cancels the leakage magnetic field generated in the horizontal deflection coil.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. Example 1 FIG. 1 is a perspective view showing a deflection device of Example 1. On the inner peripheral wall of the horizontal side wall of the deflection yoke core 1, horizontal deflection coils 11 wound in a saddle shape are arranged so as to face each other, and on the vertical side wall, a vertical deflection coil 12 wound in a toroidal shape is vertically arranged. It is arranged facing each other. As the vertical deflection coil 12, a saddle type coil may be arranged on the inner peripheral wall.

At the upper and lower ends of the front surface of the deflection yoke core 1,
The leakage magnetic field canceling device 13 is arranged so as to form an inverse magnetic field with respect to the leakage magnetic field of the horizontal deflection coil 11. The leakage magnetic field canceling device 13 uses 50 magnetic powders.
It comprises a magnetic core 14 made of a resin molded body containing by weight, and a winding 15 wound around the magnetic core 14 a plurality of times.

The magnetic core 14 is made of a flat plate-shaped compact filled in a resin such as an epoxy resin so as to insulate particles of magnetic powder such as ferrite, and the horizontal deflection coil 1
The deflection yoke core 1 is arranged at the upper and lower ends of the front surface of the deflection yoke core 1 so as to be oriented in the direction of the leakage magnetic field generated by 1. The winding 15 is wound around the magnetic core 14 so as to form a reverse magnetic field with respect to the leakage magnetic field, and is connected so that part or all of the current of the horizontal deflection coil 11 flows.

In the above deflection device, the winding 15
By causing a part or all of the current of the horizontal deflection coil to flow in, a reverse magnetic field is formed with respect to the leakage magnetic field of the horizontal deflection coil 11, and the leakage magnetic field is canceled. At this time, since the magnetic powder is insulated by the resin, the eddy current loss does not occur and the leakage magnetic field is efficiently canceled. Further, since the magnetic core 14 can be accurately opposed to the direction of the leakage magnetic field and its adjustment is easy, the leakage magnetic field is almost completely canceled.

Second Embodiment FIG. 2 is a perspective view showing a deflection device of a second embodiment. In this embodiment, the deflection yoke core 1 is constructed similarly to that of FIG. 1, and the horizontal deflection coil 11 and the vertical deflection coil 1 are arranged.
2 are arranged, but are not shown.

Reference numeral 16 denotes a winding separator used as a winding frame when forming a winding on the deflection yoke core 1. The magnetic core 14 made of a resin molding containing 50% by weight or more of magnetic powder is used as the winding separator 16. The magnetic core 14 is integrally formed, and a winding 15 is applied to the magnetic core 14 to form a leakage magnetic field canceling device 13.

In the above-mentioned deflection device, the winding separator 16 is attached to the deflection yoke core 1 so that the leakage magnetic field canceling device 13 forms an inverse magnetic field with respect to the leakage magnetic field of the horizontal deflection coil 11, so that the above-mentioned embodiment is realized. Like the above, the leakage magnetic field is canceled and the assembling property is excellent.

In the above embodiment, the magnetic core 1
Although 4 is formed in a flat plate shape, it may have a curved plate shape or other shapes, or may have a structure having a window portion in the plate.

[0018]

According to the deflection device of the first aspect of the present invention, since the leakage magnetic field canceling device made of the resin molding containing 50% by weight or more of the magnetic powder is used, the eddy current loss does not occur and the weight is light. In addition, it is possible to obtain a deflection device that can efficiently prevent a leakage magnetic field at low cost.

According to the deflection device of the second aspect of the present invention, since the leakage magnetic field canceling device in which the magnetic core made of the resin molding containing 50% by weight or more of the magnetic powder is wound, the leakage magnetic field canceling device is used. The device can be accurately opposed to the stray magnetic field, thereby providing a deflection device that can prevent the stray magnetic field more efficiently.

According to the deflection device of the third aspect of the present invention, since the leakage magnetic field canceling device is integrated with the winding separator, a deflection device excellent in assembling property can be obtained in addition to the above.

[Brief description of drawings]

FIG. 1 is a perspective view of a deflection device according to a first embodiment.

FIG. 2 is a perspective view of a deflection device according to a second embodiment.

FIG. 3 is a perspective view of a conventional deflection device.

[Explanation of symbols]

 1 Deflection yoke core 11 Horizontal deflection coil 12 Vertical deflection coil 13 Leakage magnetic field canceling device 14 Magnetic core 15 Winding 16 Winding separator

Claims (3)

[Claims] 1. A leakage magnetic field canceling device made of a resin molding containing 50% by weight or more of magnetic powder is arranged at the front surface of the deflection yoke core so as to form a reverse magnetic field against the leakage magnetic field of the horizontal deflection coil. A deflection device characterized by the above. 2. A leakage magnetic field canceling device in which a magnetic core made of a resin molding containing 50% by weight or more of magnetic powder is wound multiple times on a magnetic core to form a reverse magnetic field against the leakage magnetic field of the horizontal deflection coil. As described above, the deflection device is arranged on the front surface of the deflection yoke core and is connected so as to allow a part or all of the current of the horizontal deflection coil to flow. 3. A leakage magnetic field canceling device which is made of a resin molding containing 50% by weight or more of magnetic substance powder and is integrated with a winding separator so as to form a reverse magnetic field against the leakage magnetic field of the horizontal deflection coil. A deflection device arranged on the front surface of a deflection yoke core.