JP2001210255A - Deflection yoke for monochrome tv - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive deflection yoke for a monochrome TV capable of compensating a horizontal trapezium distortion, using an easy method. SOLUTION: The deflection yoke for a monochrome TV is equipped with one pair each of horizontal deflection coils and vertical deflection coils. The pair of the vertical deflection coils comprise left and right side vertical deflection coils mutually connected in series V1 and V2, resistors R1 and R2 and a semi-fixed resistor VR provided with the fixed parts A, C and the movable part B. While the fixed parts, A, C of the semi-fixed resistor VR are connected to one end of the resistors, R1 and R2 respectively, the other ends, E and F of the resistors, R1 and R2 are connected to one end each of the vertical deflection coils, V1 and V2. The movable part B of the semi-fixed resistor VR is connected to the connection point C of the vertical deflection coils, V1, V2, to transform the current flowing to the left and right vertical deflection coils V1, V2, mutually connected in series.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a monochrome deflection yoke used for a monochrome display monitor, and more particularly to a monochrome deflection yoke capable of correcting trapezoidal distortion in a horizontal direction of a screen.

[0002]

2. Description of the Related Art A vertical deflection coil and a magnetic field of a monochromatic deflection yoke, which has been widely used in a monochrome display monitor or the like, are generally shown in FIG. In such a monochrome deflection yoke, for example, if the center of the magnetic field distribution of the deflection yoke or the center of the electron beam is separated in the horizontal direction of the screen, or if there is an imbalance in the winding distribution of the left and right vertical deflection coils, the monitor will not work. Figure 3 on raster screen
Horizontal trapezoidal distortion as shown in (b) and (c) has occurred. In recent years, with the increase in definition and size of the black-and-white display monitor, a black-and-white display monitor capable of correcting even a slight distortion such as trapezoidal distortion in the horizontal direction has been required. In order to correct these horizontal trapezoidal distortions, the conventional monochrome deflection yoke attaches a magnetic field correction magnet consisting of a bar-shaped magnet or a columnar magnet to the screen side of the cathode ray tube, and corrects the magnetic field while looking at the display monitor screen. The distortion was corrected by changing the mounting position and size of the magnet or rotating the columnar magnet. In addition, a pincushion distortion correction circuit is provided separately from the monochrome deflection yoke, and a correction current is superimposed on the deflection current to correct horizontal trapezoidal distortion.

[0003]

However, the means for correcting trapezoidal distortion in the horizontal direction by the above-described magnetic field correction magnet can correct the trapezoidal distortion partially, but it is difficult to correct the trapezoidal distortion entirely. Sometimes it is necessary to add and attach a correction magnet or to move the front side of the deflection yoke to the left and right to adjust the correction amount, which makes the adjustment work complicated. On the other hand, in the means for correcting trapezoidal distortion using the pincushion distortion correction circuit, it is necessary to provide a pincushion distortion correction circuit separately from the deflection yoke in order to obtain a current necessary for correcting the trapezoidal distortion. There was a disadvantage that it became expensive.

It is an object of the present invention to provide an inexpensive monochrome deflection yoke which can correct horizontal trapezoidal distortion by simple means.

[0005]

According to an aspect of the present invention,
A monochrome deflection yoke having a pair of horizontal deflection coils and a pair of vertical deflection coils, wherein the pair of vertical deflection coils are connected in series with left and right vertical deflection coils V1, V2.
, Resistors R1 and R2, and a semi-fixed resistor VR having fixed portions A and C and a movable portion B. The fixed portions A and C of the semi-fixed resistor VR are connected to resistors R1 and R2. And the other ends E and F of the resistors R1 and R2 are connected to one ends of the vertical deflection coils V1 and V2, and the movable portion B of the semi-fixed resistor VR is connected to the vertical deflection coils V1 and V2. Left and right vertical deflection coils V connected in series to point G
The present invention provides a monochrome deflection yoke which is configured to change the current flowing through V1 and V2.

In the monochrome deflection yoke according to the present invention, the fixed portions A and C of the semi-fixed resistor VR are connected to the resistors R1 and R2.
2 and the other ends E and F of the resistors R1 and R2 are connected to one ends of the vertical deflection coils V1 and V2, and the movable part B of the semi-fixed resistor VR is connected to the vertical deflection coils V1 and V2.
Of the left and right vertical deflection coils V1 and V2 depending on the state of trapezoidal distortion displayed on the screen.
Can be controlled by a semi-fixed resistor to correct horizontal trapezoidal distortion. In addition, the work of attaching the correction magnet is not required, and the trapezoidal distortion in the horizontal direction can be easily adjusted by the semi-fixed resistor, so that an inexpensive monochrome deflection yoke with improved workability for adjusting the trapezoidal distortion can be obtained.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. Note that the present invention is not limited by this. FIG.
FIG. 2 is a circuit diagram showing the configuration of the monochrome deflection yoke 1 according to the present invention, and FIG. 2 is an explanatory diagram of a magnetic field generated by a pair of vertical deflection coils. In the figure, V1 and V2 denote left and right vertical deflection coils, and the left vertical deflection coil V1 and the right vertical deflection coil V2 are connected in series at a connection point G.
R1 and R2 are resistors, and VR is a fixed part A, C
And a semi-fixed resistor having a movable part B. The fixed portion A of the semi-fixed resistor VR is connected to one end of the resistor R1, the fixed portion C is connected to one end of the resistor R2, and the other end E of the resistor R1 is connected to one end of the vertical deflection coil V1. The other end F of the resistor R2 is connected to one end of the vertical deflection coil V2. Further, the movable portion B of the semi-fixed resistor VR is connected to a connection point G between the vertical deflection coils V1 and V2 to form a pair of vertical deflection coils.

According to the monochrome deflection yoke according to the present invention thus constructed, the left and right vertical deflection coils V1,
When the center of the magnetic field distribution of V2 coincides with the center of the electron beam and the winding distribution of the left and right vertical deflection coils V1 and V2 is balanced, the magnetic field strength in the horizontal direction of the screen is as shown in FIG.
As shown in FIG. 3A, the screen becomes symmetrical, and the raster screen has a square shape as shown in FIG. The movable portion B of the semi-fixed resistor VR is located substantially in the middle of the semi-fixed resistor VR.

On the other hand, if the center of the magnetic field distribution of the left and right vertical deflection coils V1 and V2 does not coincide with the center of the electron beam, or if the winding distribution of the left and right vertical deflection coils V1 and V2 becomes unbalanced, FIG. ), The magnetic field strength in the left direction of the screen is increased, and the raster screen also has a horizontal trapezoidal distortion (see FIG. 3 (b)) on the left screen side, and the horizontal plane of the screen as shown in FIG. 4 (c). As the magnetic field intensity increases, horizontal trapezoidal distortion (see FIG. 3C) in which the right side of the raster screen becomes large occurs. Therefore, when a large horizontal trapezoidal distortion occurs on the left side of the raster screen as shown in FIG. 3B, the movable portion B of the semi-fixed resistor VR is moved to the left side and a large vertical deflection is performed by the right vertical deflection coil V2. If the current is made to flow, the electron beam is deflected to a greater extent in the vertical and vertical directions when the screen is deflected to the right than when the screen is deflected to the left, and as a result, as shown in FIG. A raster screen is obtained. On the other hand, when a large horizontal trapezoidal distortion occurs on the right side of the raster screen, the movable portion B of the semi-fixed resistor VR is moved to the right side so that a large vertical deflection current flows through the left vertical deflection coil V1. The beam is more greatly deflected in the vertical direction when the screen is deflected to the left than when the screen is deflected to the right, and as a result, as shown in FIG.

As described above, according to the monochrome deflection yoke of the present invention, a horizontal trapezoidal distortion can be easily corrected by simple means, and an inexpensive monochrome deflection yoke with improved adjustment workability can be provided. Becomes

[0011]

According to the present invention, a trapezoidal distortion in the horizontal direction which occurs in a monochrome display monitor equipped with a monochrome deflection yoke can be easily corrected by simple means, and an inexpensive monochrome deflection with improved adjustment workability. Yoke can be provided. There are significant practical effects.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing a configuration of a monochrome deflection yoke according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a magnetic field generated by left and right vertical deflection coils.

3A and 3B show a state of a raster screen due to a magnetic field of left and right vertical deflection coils, wherein FIG. 3A shows a state in which the screen is balanced, and FIG. 3B shows a horizontal trapezoidal distortion in which the left side of the raster screen is large; (C) is an explanatory view showing a large horizontal trapezoidal distortion on the right side of the raster screen.

4A and 4B show the magnetic field strength by a vertical deflection coil in the horizontal direction of the screen. FIG. 4A shows a state where the magnetic field strengths on the left and right sides of the screen are balanced, and FIG. 4B shows a state where the magnetic field strength on the left side of the screen is larger. FIG. 3C is an explanatory diagram showing a state where the magnetic field strength on the right side of the screen is larger.

[Explanation of symbols]

 Reference Signs List 1 Deflection coil for monochrome 2 Raster 3 Electron beam 4 Magnetic field V1, V2 Vertical deflection coil R1, R2 Resistor VR Semi-fixed resistor A, C Fixed end B Movable end E, F One end of resistor G Connection point

Claims (1)

[Claims] 1. A monochrome deflection yoke having a pair of horizontal deflection coils and a pair of vertical deflection coils, the pair of vertical deflection coils being connected in series with left and right vertical deflection coils V1, V2, and a resistor R1. , R2, and a semi-fixed resistor VR having fixed portions A, C and a movable portion B. The fixed portions A, C of the semi-fixed resistor VR are connected to resistors R1, R
2 and the other ends E and F of the resistors R1 and R2 are connected to one ends of the vertical deflection coils V1 and V2, and the movable portion B of the semi-fixed resistor VR is connected to the vertical deflection coil V.
A monochromatic deflection yoke which is connected to a connection point G between the first and second vertical deflection coils so as to change currents flowing through left and right vertical deflection coils V1 and V2 connected in series.