JPH07169413A - Deflection yoke - Google Patents

Abstract

PURPOSE:To correct misconvergence of RED and BLUE in Y direction on Y axis. CONSTITUTION:Frame coils 6 are wound around frame coil bobbins 2. E-shaped magnetic bodies 7 are inserted into the frame coil bobbins 2 and magnetic fields are generated from the tips of the E-shaped magnetic bodies 7. A magnetic body piece 9 which is inserted into a magnetic body holder interrupts a part of the magnetic fields generated from the E-shaped magnetic bodies 7. The magnetic body piece 9 interrupts a part of the magnetic fields generated from the E-shaped magnetic body 7 o that the right-left magnetic fields generated from the E-shaped magnetic body 7 are made asymmetric without using any variable resistor and misconvergence of RED and BLUE in Y direction on Y axis can be corrected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflection yoke to be combined with a cathode ray tube used in a television receiver or the like.

[0002]

2. Description of the Related Art In a deflection yoke to be combined with a cathode ray tube (hereinafter referred to as CRT), RE on the X-axis on the screen is generally caused by a lateral displacement of a ferrite core.
In order to correct the asymmetry of D and BLUE, magnetic pieces are attached to the left and right of the horizontal deflection coil of the deflection yoke on the electron gun side of the CRT to correct the deflection magnetic field of the horizontal deflection coil.

FIG. 6 is an explanatory view showing a state of a magnetic field when a variable resistor is connected to a coma coil in a conventional deflection yoke having a coma coil. In the case of a deflection yoke having a coma coil, as shown in FIG. 6, the coma coil that generates a sextupole magnetic field and the E-shaped magnetic body are attached to the left and right sides of the horizontal deflection coil on the electron gun side. Little effect can be expected. In such a case, generally, as shown in FIGS. 7 to 9, RED and BLUE on the X axis on the screen are caused by the left and right swing of the deflection yoke.
The asymmetric misconvergence on the Y axis is corrected by making the asymmetrical magnetic field on the left and right of the coma coil asymmetrical by using a variable resistor as shown in FIG.

[0004]

However, in the case of the deflection yoke configured as described above, the RED and BLUE misconvergences in the Y direction on the Y axis caused by the left and right swings cause the left and right magnetic fields generated from the coma coil. Must be made asymmetric by a variable resistor to correct the deflection yoke, which causes deterioration of efficiency of the deflection yoke and complication of the circuit.

The present invention has been made in view of the above-mentioned problems. The left and right magnetic fields generated from the coma coil are made asymmetric without using a variable resistor, and RED in the Y direction on the Y axis,
An object of the present invention is to provide a deflection yoke capable of correcting BLUE misconvergence.

[0006]

In order to achieve the above object, the deflection yoke of the present invention interrupts a part of the magnetic field of the coma coil with a magnetic piece.

[0007]

The effect of the magnetic field of the coma coil is partly reduced by blocking with the magnetic piece, and the misconvergence of RED and BLUE in the Y direction on the Y axis caused by the left and right swing is corrected, resulting in the screen. RED on the upper X axis,
It is possible to correct the BLUE asymmetry.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a side view of a deflection yoke according to an embodiment of the present invention. In FIG. 1, 1 is a neck holder. Reference numeral 2 denotes a top coil bobbin around which a top coil is wound, which is mounted on the neck holder 1. Reference numeral 3 denotes a ferrite core. Due to the deviation of the attachment of the ferrite core 3, asymmetry of RED and BLUE on the X axis on the screen occurs. Reference numeral 4 is a wiring board, and 5 is a vertical deflection coil.

FIG. 2 is a top view of the neck holder of the deflection yoke of the same embodiment. In FIG. 2, reference numeral 6 denotes a top coil, which is wound around the top coil bobbin 2. 7 is an E-shaped magnetic body. The E-shaped magnetic body 7 is the top coil bobbin 2
The magnetic field is generated from the tip of the E-shaped magnetic body 7. Reference numeral 8 is a magnetic material holder, and a magnetic piece 9 (shown in FIG. 3) is inserted into the magnetic material holder 8. Magnetic piece 9
Cuts off a part of the magnetic field generated from the E-shaped magnetic body 7.
Reference numeral 11 is a fixed band, and 10 is a screw.

FIG. 3 shows the influence of the magnetic piece 9 on the coma coil magnetic field generated by the E-shaped magnetic body 7 when the magnetic piece 9 is inserted into the magnetic body holder 8. On the side where the magnetic piece 9 is inserted, a part of the magnetic field of the coma coil 6 moves inside the inserted magnetic piece 9, so that the magnetic field spanning the RED electron beam is reduced and the deflection force FR is weakened. That is, the pattern as shown in FIG. 8 can be corrected.

FIG. 4 is a wiring diagram of the vertical portion of the deflection yoke of this embodiment. A coma coil is connected in series to the vertical coil.

[0013]

As described above, according to the present invention, the RED on the X-axis on the screen caused by the left and right displacement of the ferrite core mounting of the deflection yoke without deterioration of the deflection efficiency and complication of the circuit, BLUE asymmetry can be corrected by blocking a part of the magnetic field generated by the coma coil with a magnetic piece.

[Brief description of drawings]

FIG. 1 is a side view of a deflection yoke according to an embodiment of the present invention.

FIG. 2 is a top view of a neck holder of a deflection yoke according to an embodiment of the present invention.

FIG. 3 is an explanatory view showing a state of a magnetic field when a magnetic piece is attached in the embodiment.

FIG. 4 is a wiring diagram of a vertical portion of the deflection yoke of the same embodiment.

FIG. 5 is an explanatory diagram showing a state of a magnetic field generated by a conventional top coil.

FIG. 6 is an explanatory diagram showing a state of a magnetic field when a variable resistor is connected to a conventional coma coil.

FIG. 7 is an explanatory diagram showing an asymmetric state of RED and BLUE on the X axis.

FIG. 8 is an explanatory diagram showing a pattern when the asymmetry shown in FIG. 7 is corrected by swinging the deflection yoke.

9 is an explanatory diagram showing a state in which the pattern shown in FIG. 8 is corrected by a magnetic field of a coma coil.

[Explanation of symbols]

 1 neck holder 2 coma coil bobbin 3 ferrite core 4 wiring board 5 vertical deflection coil 6 coma coil 7 E-shaped magnetic material 8 magnetic material holder 9 magnetic piece 10 screw 11 fixed band

Claims (1)

[Claims] 1. A deflection yoke for generating a deflection magnetic field for deflecting an electron beam of a cathode ray tube, comprising a coma coil for generating a sextupole magnetic field on the electron gun side of the cathode ray tube and an E-shaped magnetic body. A deflection yoke is provided with a magnetic piece that blocks a part of the magnetic field generated by the top coil.