JPH0898193A - Color picture tube device - Google Patents

Abstract

PURPOSE: To attain correction for pincushion vertical isotropic astigmatism without moving unwillingly the electron beam at the center. CONSTITUTION: An inline color picture tube 8, a self-convergence deflecting yoke 9 attached to it, a pair of auxiliary coils 19, 20 around a pair of cores arranged symmetrically at the upper and the lower parts of the end part of the defleftion yoke 9 on the electron gun side, and a control circuit 12 to shunt a vertical deflecting current to the auxiliary coils 19, 20 are provided. The control circuit 12 is constituted of a serial connected body of two resistors 13, 14 connected in series to vertical coils 11a, 11b, two diodes 15, 16 connected to both ends of the serially connected body at their one ends of the same polarity, and two variable resistors 17, 18 connected to each other end of both diodes 15, 16 at their one ends. The other ends of both variable resistors 17, 18 are connected to the intermediate connection point of the serially connected body through the auxiliary coils 19, 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color picture tube incorporating an in-line type electron gun, a self-convergence type deflection yoke mounted on the color picture tube, and an end portion of the deflection yoke on the electron gun side. A pair of U-shaped or E-shaped cores symmetrically arranged above and below, auxiliary coils wound on both cores and connected to each other, and a vertical deflection current is shunted to the auxiliary coils. The present invention relates to a color picture tube device including a control circuit.

[0002]

2. Description of the Related Art In general, a color picture tube having an in-line type electron gun built therein is equipped with a deflection yoke of a self-convergence type. This deflection yoke generates a horizontal deflection magnetic field distorted in a pincushion shape and a vertical deflection magnetic field distorted in a barrel shape, so that the horizontal lines projected on the phosphor screen surface are shown in FIG. 3 especially at the four corners of the screen. Prone to misconvergence as shown. That is,
In the first and third quadrants of the phosphor screen surface 1, the red horizontal line R is above the blue horizontal line B, and in the second and fourth quadrants, the blue horizontal line B is the red horizontal line R. Located above each of the two horizontal lines R and B
Are liable to cause misconvergence (hereinafter referred to as a negative trilemma) which intersects on the vertical axis V. This negative trilemma can be reduced by reducing the degree of barrel distortion of the vertical deflection magnetic field. However, with such a configuration, in the upper and lower parts of the phosphor screen surface 1 on the vertical axis V, as shown in FIG.
Vertical line misconvergence occurs as shown in. This misconvergence is called pincushion type vertical isotropic astigmatism (hereinafter abbreviated as pin type Yh), and for example, a correction magnetic field generator as disclosed in Japanese Patent Laid-Open No. 2-44634 is used. Can be corrected.

The correction magnetic field generator is, as shown in FIG.
A pair of Us provided above and below the electron gun side end of the deflection yoke.
It is composed of letter-shaped cores 2 and 3 and coils 4 and 5 wound around the cores 2 and 3. When a positive half cycle component of the vertical deflection current is passed through the coil 5 wound around the lower core 3, a sextupole magnetic field is generated, and three electron beams b, g and r in the color picture tube 6 are generated. Forces act in the directions indicated by arrows Fb, Fg, and Fr. Then, when a negative half-cycle component of the vertical deflection current is passed through the coil 4 wound around the upper core 2, the same force as described above acts on the three electron beams b, g, r, so that the pin type Yh can be corrected.

[0004]

However, when the pin type Yh is corrected using the correction magnetic field generator configured as described above, the center of the center during the scanning period of the upper half (or the lower half) of the screen is scanned. Since the electron beam g moves upward (or downward) indicated by the arrow Fg, the electron beams b and r on both sides are generated.
Misco-vergence occurs between and. That is, the center electron beam g that should have been substantially converged with respect to the electron beams b and r on both sides accompanied by the pin type Yh.
However, by providing the correction magnetic field generator, a new misconvergence is caused, and the green horizontal line G spreads vertically with respect to the red and blue horizontal lines R and B as shown in FIG. .

Therefore, an object of the present invention is to provide a color picture tube device capable of correcting the pin type Yh without involuntarily moving the center electron beam.

[0006]

According to the present invention, in order to achieve the above-mentioned object, a color picture tube incorporating an in-line type electron gun and a deflection of a self-convergence type mounted on the color picture tube. A yoke, a pair of U-shaped or E-shaped cores symmetrically arranged above and below the electron gun side end of the deflection yoke, and one core wound around each core and connected to each other. A pair of auxiliary coils and a control circuit for shunting a vertical deflection current to the auxiliary coils are provided, and the control circuit includes a series connection body of two resistors connected in series to the vertical coil of the deflection yoke, and the series connection body. It is composed of two diodes, one end of which has the same polarity connected to both ends of the connection body, and two variable resistors whose one ends are connected to the other ends of both diodes. Of the series connection Color picture tube apparatus is provided which is characterized by comprising connected between the connection point.

[0007]

In the present invention, the control circuit for shunting the vertical deflection current to the pair of auxiliary coils includes a series connection body of two resistors connected in series to the vertical coil of the deflection yoke, and this series connection. It consists of two diodes with one end of the same polarity connected to both ends of the body, and two variable resistors with one end connected to each other end of both diodes. The other ends of both variable resistors are connected via the auxiliary coil. Since the positive half-cycle component and the negative half-cycle component of the vertical deflection current are both connected to the intermediate connection point of the series connection body, a pair of auxiliary coils 1 is provided.
Divide into 9 and 20. Therefore, a quadrupole magnetic field acts on the three electron beams, and pin-type Yh correction can be performed in which only the electron beams on both sides are moved outward without involuntarily moving the center electron beam. Become.

Further, since the amounts of the positive and negative half cycle components of the vertical deflection current shunted to the pair of auxiliary coils can be adjusted by the pair of variable resistors, respectively, the upper half portion and the lower half portion of the screen can be adjusted. The pin type Yh in the half part can be individually corrected.

[0009]

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

As shown in FIG. 1, an in-line type electron gun 7 is provided.
A color picture tube 8 having a built-in type is equipped with a deflection yoke 9 of a self-convergence type. The deflection yoke 9 includes a pair of saddle type horizontal coils 10a and 10b and a pair of saddle type vertical coils 11a and 11b. Have A control circuit 12 for correcting the pin type Yh is connected to the pair of vertical coils 11a and 11b.

The control circuit 12 includes a pair of vertical coils 11.
a series connection of two resistors 13 and 14 connected in series to a and 11b, two diodes 15 and 16 in which negative terminals (cathodes) are connected to both ends of this series connection, and both diodes 15 , 16 consisting of two variable resistors 17 and 18, one end of which is connected to each positive polarity end (anode), and a pair of auxiliary coils 19 and 20, and the other end of each of the variable resistors 17 and 18 is 1 It is connected to an intermediate connection point 21 of the two resistors 13 and 14 via a pair of auxiliary coils 19 and 20. The two resistors 13 and 14 have the same resistance value.

As shown in FIG. 2, the pair of auxiliary coils 19 and 20 are respectively wound around a pair of U-shaped cores 22 and 23, and the pair of U-shaped cores 22 and 23 are deflected. The yokes 9 are arranged symmetrically above and below the electron gun side end.

In the color picture tube device having such a configuration, the positive half-cycle component and the negative half-cycle component of the vertical deflection current are both a pair of auxiliary coils 19 and 2.
Divide to 0. Therefore, the quadrupole magnetic field as shown in FIG. 2 acts on the three electron beams b, g and r, and the center electron beam g is not moved unintentionally, and only the electron beams b and r on both sides are externally irradiated. Directional forces Fb and Fr can be applied. That is, since the generation of the 6-pole magnetic field as shown in FIG. 5 can be changed to the generation of the quadrupole magnetic field as shown in FIG.
The pin type Yh can be corrected.

The amount of the positive half-cycle component of the vertical deflection current shunted to the pair of auxiliary coils 19 and 20 is variable resistor 17, and the amount of the negative half-cycle component is variable resistor 1.
Since each can be adjusted by 8, the pin type Yh in the upper half portion and the lower half portion of the screen can be individually corrected. Further, the axial deviation component between the color picture tube 8 and the deflection yoke 9 can be simultaneously corrected.

A pair of E-shaped cores can be used instead of the pair of U-shaped cores 22 and 23. Further, a coil other than the pin-type Yh correction coil, for example, a coma aberration correction coil can be wound around these cores. Furthermore, the two diodes 15 and 16 may be connected to the opposite polarity to the illustrated example.

[0016]

As described above, according to the present invention, the pincushion type vertical isotropic astigmatism that occurs as the degree of barrel distortion of the vertical deflection magnetic field is weakened in order to reduce the negative trilemma, It is possible to make a correction without unintentionally moving the electron beam, and this correction can be made individually in the upper half and lower half of the screen.

[Brief description of drawings]

FIG. 1 is an electric circuit diagram of a color picture tube device according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a pin-type Yh correction quadrupole magnetic field of the color picture tube device according to the embodiment of the present invention.

FIG. 3 is an explanatory diagram of an image pattern with a negative trilemma.

FIG. 4 is an explanatory diagram of an image pattern including a pin type Yh.

FIG. 5 is an explanatory diagram of a conventional pin-type Yh correction magnetic field generator.

FIG. 6 is an explanatory diagram of an image pattern generated by a conventional pin-type Yh correction magnetic field generator.

[Explanation of symbols]

 8 Color Picture Tube 9 Deflection Yoke 11a, 11b Vertical Coil 12 Control Circuit 13, 14 Resistance 15, 16 Diode 17, 18 Variable Resistance 19,20 Auxiliary Coil 22,23 U-shaped Core

Claims (1)

[Claims] 1. A color picture tube having an in-line type electron gun built-in, a self-convergence type deflection yoke mounted on the color picture tube, and symmetrically above and below the electron gun side end of the deflection yoke. A pair of U-shaped or E-shaped cores arranged, a pair of auxiliary coils wound around the cores and connected to each other, and a control circuit for shunting a vertical deflection current to the auxiliary coils. And the control circuit includes a series connection body of two resistors connected in series to the vertical coil of the deflection yoke, and two diodes having one end of the same polarity connected to both ends of the series connection body. It consists of two variable resistors with one end connected to each other end of both diodes,
A color picture tube device, wherein the other ends of both variable resistors are connected to an intermediate connection point of the series connection body via the auxiliary coil.