JPH01253142A - Deflection yoke device - Google Patents

Abstract

PURPOSE:To reduce the loss by the high-frequency magnetic field and surely correct the deflecting magnetic field by constituting a magnetic field correcting piece with multiple fine wire-shaped magnetic materials and arranging it so that the lengthy direction of the magnetic materials is extended nearly in the same direction as the direction of the magnetic field to be corrected. CONSTITUTION:A magnetic field correcting piece 1 is constituted by arranging many fine wire-shaped magnetic materials 1a-1n. The correcting piece 1 is arranged so that the lengthy direction of the magnetic materials matches with the direction of the deflecting magnetic field to be corrected. The fine wire- sheped magnetic materials of the correcting piece 1 constitute a magnetic circuit parallel with the vertical deflecting magnetic field phiV. The magnetic resistance value is sufficiently low, and it effectively acts for the correction of the vertical deflecting magnetic field. On the other hand, the horizontal deflecting magnetic field phiH permeates the correcting piece 1 in the thickness direction. An eddy current is generated on the perpendicular plane to the magnetic flux, but the magnetic field correcting piece 1 is finely divided on the perpendicular plane. The resistance value of a current circuit becomes extremely high, thus the eddy current loss is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a deflection yoke device used in a cathode ray tube of television equipment.

<Prior art> In general, in a cathode ray tube in which electron beams are arranged in-line, the horizontal deflection magnetic field as a whole is made into a binkushion shape, and the vertical deflection magnetic field is made into a barrel shape as a whole, thereby theoretically achieving good coverage over the entire screen area. You can get convergence. However, in reality, misconvergence remains due to the structure of the cathode ray tube and the deflection yoke. This misconvergence must be corrected individually depending on the type of cathode ray tube and the characteristics of the deflection yoke incorporated therein.

For this reason, conventionally, magnetic pieces made of silicon steel, permalloy, or the like have been placed at appropriate locations on the deflection yoke to correct the deflection magnetic field.

For example, looking at the vertical deflection magnetic field that deflects the electron beam in the vertical direction of the screen, it is necessary to set the screen side to a substantially binction magnetic field and the electron gun side to a strong barrel magnetic field. For this reason, as shown in Japanese Unexamined Patent Publication No. 57-3352, a magnetic piece is placed on the electron gun side between the horizontal deflection coil and the vertical deflection coil.

<Problem to be Solved by the Invention> By the way, a horizontal deflection current of 15.75 KHz is normally passed through the horizontal deflection coil, and a current of a high frequency of 32 KHz or 64 KHz is passed through the horizontal deflection coil in television equipment that targets text information. used. For this reason, the magnetic piece disposed in a high-frequency magnetic field generates heat due to eddy current loss, which significantly increases the temperature of the deflection yoke and also increases the loss of horizontal deflection power.

In addition, since the magnetic piece is placed in a narrow gap such as between a horizontal deflection coil and a vertical deflection coil, it can only be made thin, and it quickly saturates due to high magnetic flux density and corrects the deflection magnetic field. can't do enough.

For this reason, it is conceivable to use a magnetic piece with high magnetic permeability, but this has the disadvantage that the magnetic piece generates more heat due to an increase in eddy current loss due to a decrease in magnetic resistance.

The present invention has been made in order to eliminate the above-mentioned drawbacks, and provides a deflection yoke device that reduces loss due to high frequency magnetic fields and ensures correction of a specific deflection magnetic field.

Means for Solving the Problems> A deflection yoke device of the present invention includes a deflection yoke device i equipped with a horizontal deflection coil and a vertical deflection coil, and a magnetic field correction piece that affects the magnetic field generated from the coil. It is characterized in that it is composed of a plurality of thin magnetic bodies and is arranged so that the longitudinal direction of the magnetic bodies extends in substantially the same direction as the direction of the magnetic field to be corrected.

Effect〉 Since the magnetic field correction piece is composed of multiple thin wire-shaped magnetic bodies, the resistance value of the entire magnetic field correction piece increases against eddy current caused by magnetic flux passing through the magnetic field correction piece from the thickness direction. become equivalent. Therefore, the eddy current cover becomes significantly smaller and heat generation of the magnetic field correction piece is suppressed.

In addition, since the magnetic field correction piece is arranged so that the longitudinal direction of the magnetic body almost coincides with the direction of the deflection magnetic field intended for correction, that is, the direction of magnetic flux, the magnetic path through which the magnetic flux passes is transformed into a path with lower magnetic resistance. In other words, the form of the deflection magnetic field can be changed.

<Examples> Examples of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows a plan view of the magnetic field correction piece. The magnetic field correction piece 1 is constructed by arranging a large number of thin linear magnetic bodies 1a, 1b to 1n. As the material of the thin magnetic wire, a material with high magnetic permeability such as pure iron, silicon steel, permalloy, etc. is used. Individual magnetic bodies 1a, l
b to 1n have an insulating coating made of a known substance.

For example, in the case of silicon steel, it is desirable to have a resistivity of 10 Ωm or more, as in the case of cross-cutting a phosphate film.

When the thin wire magnetic bodies 1a, lb to 1n have a rectangular cross section as shown in FIG. 2a, the space factor of the magnetic portion 2 can be increased. Each magnetic portion 2 is coated with an insulating nuclide 3 and electrically isolated from each other, and is formed into a plate shape using an insulating material such as silicone varnish. Alternatively, it may be formed into a plate shape using varnished glass cloth or the like as a base. Magnetic material 1a.

1b to 1n have cross-sectional dimensions of 0.2 to 0.71 on one side.
That's about it.

FIG. 2b shows another embodiment of the thin wire magnetic bodies 1a, 1b to 1n. The magnetic material has a circular cross section 4 and an insulating nuclide 5 . The other configurations are the same as described above.

In this case, it can be made inexpensively.

As shown in FIG. 3, the magnetic field correction piece 1 is disposed on the I+41 side of the horizontal deflection coil 6 and the vertical deflection coil 7 on the side of the 'Seiko gun'. Note that the coil bobbin is omitted.

Although the vertical deflection coil 7 is toroidally wound around the deflection core 8, it may be a saddle-shaped coil.

However, in the present invention, the longitudinal direction of the thin linear magnetic bodies 1 a + 1 b to 1 n of the magnetic field correction piece 1 is arranged to extend in the direction of the vertical deflection magnetic field φV. Therefore, the magnetic flux at the periphery of the vertical deflection magnetic field φV passes through the magnetic field correction piece 1 as a magnetic path, and as it moves away from the deflection axis, it is strongly attracted to the magnetic field correction piece 1, resulting in the barrel-shaped magnetic field being strengthened (
φ'v).

The operation of the present invention will be described.

First, the fine pole-shaped magnetic bodies 1a, lb to 1n of the magnetic field correction piece 1 constitute a parallel magnetic circuit 9 with respect to the vertical deflection magnetic field φV. Therefore, the magnetic resistance value is sufficiently low, and the vertical deflection It acts sufficiently effectively to correct the magnetic field.

On the other hand, the horizontal deflection magnetic field φH passes through the magnetic field correction piece 1 from the thickness direction. A current in the vortex' is generated in a plane perpendicular to the magnetic flux, and the magnetic field correction piece 1 has a structure in which the orthogonal plane is subdivided.

Therefore, the resistance value of the current circuit becomes extremely high and the eddy current loss becomes small.

Further, the eddy current loss is proportional to the thickness of the magnetic field correction piece and the square of the frequency of the magnetic field, and is inversely proportional to the resistivity specific to the magnetic field correction piece. Therefore, the thickness d of the magnetic field correction piece and the width S of the thin magnetic material are determined by taking into consideration the frequency of the horizontal deflection magnetic field. That is, when the frequency becomes high, the width S is made small.

Further, the thickness d of the magnetic field correction piece is determined in consideration of the magnitude of the demagnetizing field generated inside the correction piece.

Note that when the magnetic field correction piece undergoes magnetic saturation with respect to the vertical deflection magnetic field, a material with high magnetic permeability, for example, pure iron, is used. The increase in heat generation in this case can be avoided by reducing the eddy current loss.

<Effects> Since the present invention is a deflection yoke device in which the magnetic field correction piece is constructed and arranged as described above, it has the following effects.

(1) Since the magnetic field correction piece is constructed by installing multiple thin wire magnetic bodies, it is possible to configure the electrical resistance of the eddy current path generated by the magnetic flux passing from the thickness direction to be high, and as a result, the eddy '11L flow loss can be increased. Can be made smaller.

(2) Since the magnetic field correction pieces are arranged on the deflection yoke so that the longitudinal direction of the thin magnetic material forming the magnetic field correction pieces is oriented in almost the same direction as the direction of the magnetic flux of the deflection magnetic field to be corrected, the magnetic field correction pieces can be effectively deflected. Magnetic field modifications can be made.

(3) Even when the frequency of the first horizontal deflection stream is high and therefore a high-frequency magnetic field acts on the magnetic field correction piece, the amount of heat generated by the magnetic field correction piece can be suppressed by selecting the width of the thin magnetic material, and the deflection yoke It is possible to prevent the temperature of the device from rising.

(4) Since the magnetic field correction piece is made of subdivided magnetic material,
Eddy current loss can be reduced, heat generation can be suppressed, thereby preventing an increase in horizontal deflection power, and since a magnetic material with high magnetic permeability can be used, magnetic saturation relative to the vertical deflection value field can be reduced.

[Brief explanation of the drawing]

1 is a plan view of a magnetic field correction piece according to the present invention, FIGS. 2a and 2b are sectional views of the magnetic field correction piece of FIG. 1, FIG. 3 is a schematic sectional view of the deflection yoke device, and FIG. FIG. 2 is an explanatory diagram showing the arrangement of magnetic field correction pieces according to the present invention. In the figure, 1 is a magnetic field correction piece, la, lb to 1n are thin magnetic materials, 2 and 4 are magnetic parts, 3.5 is an insulating coating, and 6 is water'P
Deflection coils 7 are 1f direct deflection coils, and 8 is 1 flat core. Patent applicant Murata Manufacturing Co., Ltd. Figure 1 Figure 2a Figure 2b

Claims (1)

[Claims] 1. In a deflection yoke device equipped with a horizontal deflection coil and a vertical deflection coil, the magnetic field correction piece that affects the magnetic field generated from the coil is composed of a plurality of thin wire-shaped magnetic bodies, and the longitudinal direction of the magnetic bodies is A deflection yoke device characterized in that it is arranged so as to extend in substantially the same direction as the direction of a magnetic field to be corrected.