JPH0547316A - Deflection yoke core - Google Patents

Abstract

PURPOSE:To make simple manufacture of a cancellation coil and control thereof, by providing magnetic core portions for leakage field cancellation coils on the deflection yoke core. CONSTITUTION:This deflection yoke core 11 is provided, on the outer peripheral surface thereof at the large-diameter side, with a pair of magnetic core portions 11a, 11b for leakage field cancellation coil. Since the deflection yoke core 11 is of such a structure, the cancellation coil can be integrated, as an auxiliary item of parts, with the deflection yoke by mounting the cancellation coils 13a, 13b to the magnetic core portions 11a, 11b. This makes simple and easy the manufacture of the cancellation coil and the control thereof.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflection yoke core used in a CRT or the like.

[0002]

2. Description of the Related Art As shown in FIG. 4, when deflection coils 2a and 2b are applied to a deflection yoke core 1 to pass a deflection current, most of the magnetic fields generated by the deflection coils 2a and 2b are in and around the deflection yoke core 1. 1 is concentrated in the inner space, but a part of it is radiated to the outer space and becomes a leakage magnetic field.

Therefore, conventionally, in order to cancel this leakage magnetic field, the cancel coils 3a, 3 which are separate parts.
b is provided on the large diameter side of the core 1, and a deflection current (or a part thereof) is caused to flow through this to generate a reverse magnetic field.

[0004]

However, in the conventional deflection yoke core 1, in order to cancel the leakage magnetic field generated by the deflection coils 2a and 2b, the cancellation coils 3a and 3b are formed as separate parts. Must be retrofitted. Therefore, the cancel coil 3a,
There is a problem that the structural design of 3b and the management of its mounting position, mounting procedure, etc. are required, which complicates the manufacture and management of the cancel coil.

The present invention has been made to solve the above problems, and an object of the present invention is to obtain a deflection yoke core which can simplify the manufacture and management of the cancel coil. At the same time, another object of the present invention is to obtain a deflection yoke core capable of shielding a leak magnetic field.

[0006]

A first deflection yoke core according to the present invention is provided with a magnetic core portion for a leakage magnetic field canceling coil.

The second deflection yoke core according to the present invention has the magnetic core portion for the cancel coil and the conductive film for shielding the leakage electromagnetic field on the outer peripheral surface.

[0008]

The position and size of the magnetic core portion of the first deflection yoke core can be accurately determined by the design of the molding die for the deflection yoke core. Therefore, the position of the cancel coil applied to the magnetic core is also automatically determined. Also, winding of the cancel coil becomes easy. Therefore, the manufacture and management of the cancel coil are simple and easy.

The conductive film in the second deflection yoke core can shield the leakage electromagnetic field. Other functions are the same as those of the first deflection yoke core.

[0010]

FIG. 1 shows an embodiment of the first deflection yoke core. Deflection yoke core 11 of this embodiment
As shown in the figure, a pair of magnetic core portions 11 for the leakage magnetic field canceling coil extending in the radial direction on the outer peripheral surface on the large diameter side.
a and 11b are provided.

Since the deflection yoke core 11 of the embodiment has the above-mentioned structure, the magnetic core portions 11a and 11b are
As shown in FIG. 2, by providing the cancel coils 13a and 13b, the cancel coil, which is conventionally a separate component, can be integrated with the deflection yoke core 11 as an auxiliary component. In addition, 12a and 12b are deflection coils applied to the core 11.

Therefore, the manufacture and management of the cancellation are simple and easy. That is, the magnetic core portions 11a and 11b
Can be accurately provided at a predetermined position and in a predetermined size by designing and processing the molding die. Therefore, the cancel coils 13a, 1
The position of 3b is also determined.

Further, since the cancel coils 13a and 13b may be wound around the magnetic core portions 11a and 11b, the winding work is easy. Since the manufacturing process of the cancel coil is simplified in this way, its manufacture and its management are simple and easy.

FIG. 3 shows an embodiment of the second deflection yoke core.

In the figure, the same reference numerals are attached to the same deflections as in FIG. As shown in the figure, the deflection yoke core 21 of this embodiment is obtained by applying metal plating 22 to the outer peripheral surface of the deflection yoke core 11 shown in FIG. With such a configuration, not only the cancel coil can be manufactured and managed easily and easily, but also the leakage electromagnetic field can be shielded.

[0016]

As described above, according to the present invention, since the magnetic core portion for the leakage magnetic field canceling coil is provided, the manufacturing and management of the canceling coil can be simplified. Further, according to the present invention, since the conductive film is provided on the outer peripheral surface in addition to the magnetic core portion, the electromagnetic field can be shielded in addition to the above effect.

[Brief description of drawings]

FIG. 1 is a perspective view of a deflection yoke core according to an embodiment.

FIG. 2 is a front view showing a state in which a cancel coil is applied to the deflection yoke core of FIG.

FIG. 3 is a perspective view of a deflection yoke core according to another embodiment.

FIG. 4 is a front view showing a state in which a conventional deflection yoke core is provided with a cancel coil.

[Explanation of symbols]

 11, 21 Deflection yoke cores 11a, 11b Leakage magnetic field canceling coil core parts 12a, 12b Deflection coils 13, 13a Cancellation coil 22 Metal plating

Claims (2)

[Claims] 1. A deflection yoke core provided with a magnetic core portion for a leakage magnetic field canceling coil. 2. The deflection yoke core according to claim 1, wherein a conductive film for shielding a leakage electromagnetic field is provided on an outer peripheral surface.