KR100215419B1 - Bobbin structure of deflection yoke - Google Patents

Abstract

In a deflection yoke assembly having bobbins mounted on top of the deflection yoke, two balance adjustment cores are provided inside the bobbin provided in the deflection yoke to accurately adjust the misconvergence to the absolute inductance value.

Description

Bobbin Structure of Deflection Yoke

First (a), (b) is a perspective view and a plan view showing a conventional conventional deflection yoke,

2 is a cross-sectional view showing the structure of a conventional deflection yoke bobbin,

(A) is a circuit diagram of FIG.

3 (b) is an equivalent circuit diagram of FIG. 3 (a),

4 is a cross-sectional view showing the structure of the deflection yoke bobbin according to the present invention,

5 is an equivalent circuit diagram of FIG.

Explanation of symbols for main parts of the drawings

1: deflection yoke 2: neck section

3: c-shaped 4: c-shaped

5: bobbin 6: zhdlf

7: Coil Separator 8: Horizontal Deflection Coil

9: vertical deflection coil 10: ferrite core

11: Fixed iron 12, 12A, 12B: Balance core

13: copper wire

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bobbin of a deflection yoke, and more particularly, to a bobbin of a deflection yoke that is mounted on the neck portion of a deflection yoke so as to accurately correct misconvergence of a screen.

Generally, a deflection yoke is installed in a cathode ray tube (CRT) such as a TV brown tube or a monitor to determine the position of an electron beam emitted from an electron gun. As shown in FIG. 1, the neck of the upper side of the deflection yoke 1 is provided. The coil 6 is wound around the bobbin 5, in which the U-shaped or U-shaped magnetic pieces 3 and 4 are assembled, and both sides of the part 2 are horizontally deflected inside and outside the coil separator 7. The ferrite core 10, on which the coil 8 and the vertical deflection coil 9 are wound, is fixedly installed by the fixed iron piece 11, respectively.

The basic operation of the deflection yoke configured as described above generates magnetic fields as the sawtooth pulse is applied to the horizontal and vertical deflection coils 8 and 9 to determine the position of the beam emitted from the electron gun.

However, since it is difficult to accurately scan the beam at a desired position due to an error due to the mechanical mechanism of the cathode ray tube or an error of the deflection yoke 1 itself, the magnetic pieces 3 and 4 are used as this correction means. The position of the beam is scanned on the desired dice.

The internal structure of the bobbin 5 shown in FIG. 1 (b) is shown in FIG. That is, the balance core 12 is provided in the inside of the bobbin 5.

FIG. 3 (a) shows a circuit of the structure of the conventional bobbin according to FIG. Here, the rotational speed of the balance core 12 is adjusted to vary the overall inductance value to adjust the misconvergence of the deflection yoke.

That is, as in the equivalent circuit shown in FIG. 3 (b), the total inductance L is expressed as follows.

According to Equation (1), the total inductance L total may vary depending on the values of the coils L3 and L4. Therefore, if the value of the coil L3 decreases, the current i1 flowing through the coils L1 and L3 can be represented by equation (2).

Therefore, when the value of the coil L3 is lowered, the value of the coil L4 must be increased, and as a result, the values of the currents i1 and i2 are inversely proportional to each other. Further, the ampere law for the magnetic field (H = ∫ idt) is also inversely proportional to each other in the magnetic fields F1 and F2 of the currents i1 and i2.

In this case, the magnetic field F2 of the current i2 may be represented by Equation (3).

F2 = qvB2 (where B2 = μH2) ------- (3)

Therefore, if the overall value of the balance core 12 is set to 13 μH, if the inductance value of one coil C1 is 7.8 μH, the inductance value of the opposite coil L2 is 2.3 μH.

However, there is a drawback in that a reliable deflection yoke characteristic cannot be obtained because the misconvergence generated in the conventional deflection yoke is adjusted relatively to the inductance value of the coil.

SUMMARY OF THE INVENTION An object of the present invention is to provide a bobbin structure of a deflection yoke capable of adjusting the miss convergence of a deflection yoke to an absolute value, which has been devised in view of such drawbacks.

In order to achieve the above object, the present invention is a deflection yoke assembly having a bobbin wound with a horizontal coil mounted on the neck of the upper end of the deflection yoke, characterized in that the bobbin is provided with two balance adjustment cores; It is done.

Hereinafter, with reference to the accompanying drawings will be described the configuration, operation and effect of the present invention.

4 is a cross-sectional view showing the bobbin of the deflection yoke according to the present invention, in which two balance cores 12A and 12B are provided.

Therefore, the inductance values of the horizontal coil L2 provided above and the horizontal coil L1 provided below shown in FIG. 5 are always the same.

If the inductance value of the coil L1 is 7.8 μH when the total inductance value is set to 13 μH, the coil L2 value is also 7.8 μH.

That is, as shown in the equivalent circuit of bobbin in FIG. 5, the values of currents i1 and i2 flowing through the vertical coils L1 and L2 are the same, and accordingly, the intensity F of the magnetic field of the two currents i1 and i2 is equal. Are equal to each other.

According to the present invention as described above, since two balance cores are provided inside the bobbin, the magnetic field for adjusting the miss convergence can be adjusted to the same inductance value, so that a more reliable deflection yoke can be obtained.

Claims (1)

A deflection yoke assembly having a bobbin of a coil wound in a horizontal coil mounted to a neck of an upper part of a deflection yoke, wherein said bobbin has two balance adjusting cores.