JPH07115655A - Deflection york device for color picture tube - Google Patents

Abstract

PURPOSE:To reduce the Yh correction coils of an Yh correction coil device in a deflection york device for a color picture tube. CONSTITUTION:A bridge diode circuit is used for an Yh correction circuit, the Yh correction coils 31 and 32 shared for correcting the upper part and lower part of a screen are incorporated and a vertical current in a fixed direction is made flow through the Yh correction coils 31 and 32. Thus, Yh correction coil wiring is simplified and cost reduction accompanying it is made possible.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflection yoke device for a color picture tube used in a color television receiver or the like.

[0002]

2. Description of the Related Art In recent years, a deflection yoke device for a color picture tube requires a correction circuit using a correction coil in order to correct misconvergence.

The structure of a conventional Yh correction coil device of a deflection yoke device for a color picture tube will be described below with reference to FIGS. FIG. 5 is a front view showing an internal configuration of a Yh correction coil device of a conventional deflection yoke device for a color picture tube.

Reference numeral 3 denotes a CRT neck portion, which has a structure having three R, G, and B electron guns in an in-line arrangement. The electron guns are arranged as viewed from the CRT side. The Yh correction coil device of the deflection yoke for the color picture tube is arranged at the rear of the deflection yoke, and
A pair of U-shaped magnetic bodies 1 arranged on both outer sides of the neck portion 3.
1 and 12 and Yh correction coils 33 to 36 wound around the magnetic legs of the coils. As shown in FIG. 6 which is a connection circuit, a Yn correction circuit is used here, but 33 and 34 of the Yh correction coils are Yh correction coils for the upper side of the screen and are connected in series, and 35 and 36. Is a Yh correction coil for the lower side of the screen and is connected in series. These Yh correction coils 33 to 36 are Y and
h correction is possible.

For adjustment of Yh correction, a variable resistor 54 is connected in series to the upper Yh correction coils 33 and 34 for the upper screen side at the upper side of the screen, and a Yh correction coil 35 for the lower part of the screen at the lower side of the screen. This is performed by the variable resistor 55 connected in series to 36. In the figure, 1 and 2 are vertical coils, and D ₅ and D
₆ is a diode.

The operation of the Yh correction coil device of the deflection yoke device for a color picture tube having the above structure will be described below. In a deflection yoke used in a CRT having three electron guns in an in-line arrangement, a deflection yoke composed of a horizontal deflection coil having a pin magnetic field component and a vertical deflection coil having a barrel magnetic field component is generally used.

In this case, red-left and blue-right misconvergence occurs on the Y axis as shown in FIG. 4 due to the barrel-type vertical deflection magnetic field, and Yh correction is required.
Conventionally, in the above Yh correction, as shown in FIGS. 7 and 8, Yh correction coils 33 and 34 are provided on the upper side of the screen, and Y are provided on the lower side of the screen.
Using the h correction coils 35 and 36, currents are passed through the vertical circuit to generate magnetic fields b1 and b2, and F1 and F2 forces are applied to blue and red electrons, respectively, and Yh is corrected.

[0008]

However, in the above-mentioned conventional structure, the Yh correction coils 33 and 34 at the upper side and the Yh correction coils 35 and 36 at the lower side are used independently in the upper and lower portions of the screen. So Figure 5
As described above, four Yh correction coils 33 to 36 are required. Therefore, in order to create these Yh correction coils 33 to 36, two coils are wound around each of the U-shaped magnetic bodies 11 and 12, and two equivalent coils are required. The above problems have the problems that the wiring becomes complicated and the man-hour becomes high.

The present invention solves the above-mentioned conventional problems, and provides a deflection yoke device for a color picture tube capable of correcting Yh at the upper side and the lower side of a screen with only a few two Yh correction coils. Has an aim.

[0010]

In order to achieve this object, a deflection yoke device for a color picture tube of the present invention is a deflection yoke device for an in-line type color picture tube, which is disposed at a rear portion thereof for misconvergence. Of the correction coil device, the first and second U-shaped cores, the first Yh correction coil wound on the first core, and the second Yh correction coil so as to vertically oppose the first Yh correction coil. And a second Yh correction coil wound around a U-shaped core of
The correction coil is incorporated in a bridge diode circuit, and is configured to flow a rectified current through the first and second correction coils.

[0011]

According to the present invention, the current flowing in the Yh correction coil can always be made to be in a constant direction by the above-mentioned configuration, and separate Yh correction coils are not required for the upper portion and the lower portion of the screen. Therefore, the Yh correction coil can be shared between the upper part and the lower part of the screen, and the number of Yh correction coils can be reduced from four to two. Therefore, the wiring which has been complicated until now can be simplified, and the work cost can be reduced accordingly.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS.
Will be described with reference to. The same components as those described as the conventional example are designated by the same reference numerals.

FIG. 1 is a block diagram of a correction coil device of a deflection yoke device for a color picture tube according to an embodiment of the present invention. In FIG. 1, 3 is an in-line type CRT neck portion,
U-shaped magnetic body 11 in the correction coil device to the left and right,
12 are arranged, and Yh correction coils 31 and 32 are wound around the U-shaped magnetic bodies 11 and 12 for Yh correction. The winding direction of the Yh correction coils 31 and 32 is set so that blue is wound so as to generate a magnetic field that can be acted by a force in the left direction and red is generated in the right direction. That is, FIG.
With such a magnetic field, the winding direction is such that the left Yh correction coil 31 can generate an N pole in the upper part, the lower S pole, and the right Yh correction coil 32 can generate an S pole in the upper part and an N pole in the lower part.

FIG. 2 shows a Yh correction coil 31 in a vertical circuit,
The wiring diagram of 32 is shown. As shown in the figure, diodes D _{1 to} D ₄ , variable resistors 51 and 52, and Y connected in series
The Yh correction coil 3 is provided by the h correction coils 31 and 32.
A bridge diode circuit is configured such that the terminals 1 and 32 are located inside, and the Yh correction coils 31 and 32 are connected so that a current always flows from a fixed direction. In the figure, 1 and 2 are vertical deflection coils, and 41 and 42 are resistors.

Next, the operation of the correction circuit device of the deflection yoke device for a color picture tube constructed as described above will be described with reference to FIG. First, in order to correct the misconvergence of Yh, it is necessary to adjust the red left and blue right shown in FIG. 4 to the respective centers. . For that purpose, Yh can be corrected by generating magnetic fields b1 and b2 as shown in FIG. 3 in the Yh correction coils 31 and 32 and pulling blue and red electrons in the directions F1 and F2, respectively. This Yh correction is a pair of Y
To be possible with the h correction coils 31 and 32, it is necessary to generate constant magnetic fields b1 and b2. That is, Yh
This means that it is necessary to always supply current to the correction coils 31 and 32 from a fixed direction. Therefore, as shown in FIG. 2, when the current flows from the hot side, the Yh correction coil 31 passes through the diodes D ₁ and D ₄ or the diodes D ₂ and D ₃ when the current flows from the cold side. , 32 may be supplied with an electric current. Also Y
The correction amount of h can be adjusted using the variable resistor 51 at the upper part of the screen and the variable resistor 52 at the lower part of the screen.

[0016]

As is clear from the above description of the embodiments, the present invention provides a Yh correction coil in the vertical circuit by providing a bridge diode for reducing the Yh correction coil in the Yh correction circuit section. It is possible to reduce the number to two, and solve the problem that the complicated wiring and the number of manufacturing steps are increased by separately using the Yh correction coils on the upper side and the lower side of the screen as in the prior art, and an excellent deflection yoke device for a color picture tube is provided. it can.

[Brief description of drawings]

FIG. 1 is a front view of a main part of a correction coil device of a deflection yoke device for a color picture tube according to an embodiment of the present invention.

FIG. 2 is a wiring circuit diagram of the correction coil device.

FIG. 3 is an explanatory diagram of a correction magnetic field of the correction coil device.

FIG. 4 is an explanatory diagram of misconvergence.

FIG. 5 is a front view showing the configuration of a correction coil device in a conventional deflection yoke device.

FIG. 6 is a wiring circuit diagram of the correction coil device.

FIG. 7 is an explanatory diagram of a correction magnetic field of the correction coil device.

FIG. 8 is an explanatory diagram of a correction magnetic field of the correction coil device.

[Explanation of symbols]

1, 2 Vertical coil 3 CRT neck part 11, 12 U-shaped magnetic body 31, 32 Yh correction coil 51, 52 Variable resistance D ₁ , D ₄ Diode

Claims (1)

[Claims] 1. A deflection yoke for an in-line type color picture tube, wherein a correction coil device for misconvergence disposed at a rear portion of the deflection yoke has first and second U-shaped cores and a first U-shaped core. A first Yh correction coil wound on a core-shaped core and a second Yh correction coil wound on a second U-shaped core so as to face the Yh correction coil vertically.
The deflection yoke device for a color picture tube, wherein the first and second Yh correction coils are incorporated in a bridge diode circuit so that a rectified current flows through the first and second correction coils.