JPH10208666A - Deflection yoke - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a deflection yoke furnishing the functions to correct a horizontal trapezoidal distortion and to correct the misconvergence in the vertical direction of the R and B lateral lines at the up and down ends of a screen concurrently. SOLUTION: This deflection yoke furnishes a correcting coil device in which, six coils 30a to 30f to correct the slippage of convergence of the lateral line in one direction are connected in series to the end of the small diameter opening of the deflection yoke, six coils 31a to 31f to correct the slippage of convergence in the vertical direction of the lateral line in the other direction are connected in series, two set of coils in which six coils are connected in series respectively are connected in parallel, and variable resisters 20 and 21 in order to regulate the current are provided at one side end of the parallel connection. This correcting coil device is connected in series to vertical deflection coils 8a and 8b, a magnetic flux generated by the correcting coil is regulated by the variable resistors 20 and 21 of the correcting coil device, and the YV misconvergence at the up and down ends of a screen is corrected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-convergence method in which electron beams emitted from three electron guns arranged inline are automatically concentrated by a deflection magnetic field generated by a pair of horizontal and vertical deflection coils. The present invention relates to a deflection yoke mounted on and used in a color picture tube.

[0002]

2. Description of the Related Art Generally, in a deflection yoke mounted on a self-convergence type color picture tube, various misconvergences occur due to the assembling accuracy and compatibility with the mounted color picture tube. Among them, in particular, a vertical direction generated between a red light emitting electron beam (hereinafter, referred to as a red beam) R and a blue light emitting electron beam (hereinafter, referred to as a blue beam) B of a horizontal line at an upper end of a screen and a horizontal line at a lower end of the screen in vertical deflection. It is necessary to correct the direction misconvergence (hereinafter referred to as YV misconversion). Conventionally, as a means for correcting such YV miscon- trol, a resistor and a variable resistor are connected in parallel to two vertical deflection coils arranged on the left and right sides of a color picture tube in between, and the variable resistor is used to connect two resistors. There is a method in which the balance of the magnetic field generated by a vertical deflection coil composed of a plurality of coils is changed to simultaneously correct the vertical and horizontal directions of the screen.
Hereinafter, a conventional deflection yoke provided with a means for correcting such YV misconversion will be described.

FIG. 11 is a circuit diagram of a conventional deflection yoke, FIG. 12 is a sectional view of a vertical deflection coil of the deflection yoke, and FIG.
14 is a cross-sectional view of the vertical deflection coil of the deflection yoke, FIG. 14 is an explanatory diagram showing a change in the convergence pattern on the screen, FIG. 15 is an explanatory diagram showing a change in the vertical deflection coil magnetic flux of the deflection yoke, and FIG. FIG. 4 is an explanatory diagram showing a change in horizontal trapezoidal distortion of the deflection yoke. In FIG. 11, vertical deflection coils 1a and 1b composed of two coils are connected in series with each other. A series circuit of the resistors 2a and 2b and the variable resistor 3 is connected in parallel to both ends. Further, the variable terminal 3a of the variable resistor 3 is connected to the vertical deflection coil 2
It is connected to the intermediate connection point between a and 2b.

In the circuit having the above-described configuration, by operating the variable resistor 3, the vertical deflection coils 1 a and 1
b, the resistance values connected in parallel to each other can be varied so that the vertical deflection currents flowing through the vertical deflection coils 1a and 1b can be unbalanced.

FIGS. 12 and 13 are sectional views of a vertical deflection coil in the conventional deflection yoke shown in FIG. In these figures, 11 is a vertical deflection magnetic field, 12a, 12
b is the direction of the vertical deflection current; 13a and 13b are the directions of the change in the vertical deflection current; 14 is the change in the vertical deflection magnetic field;
B, 15G and 15R are electron beams, and 16B and 16R are deflection forces applied to the electron beams 15B and 15R.

In FIG. 12A, when the electron beams 15B, 15G, and 15R are deflected to the upper side of the screen,
The directions 12a and 12b of the vertical deflection current flowing through the vertical deflection coils 1a and 1b and the state of the generated vertical deflection magnetic field 11 are shown. Similarly, FIG. 12B shows the vertical deflection current directions 12a and 12b and the vertical deflection magnetic field 11 when the electron beams 15B, 15G and 15R are deflected to the lower side of the screen. In FIG. 12, it is assumed that the position of the variable terminal 3a of the variable resistor 3 shown in FIG. 11 is at the middle point.

On the other hand, in FIG. 13, the direction of the change of the vertical deflection current 13 when the position of the variable terminal 3a of the variable resistor 3 is moved toward the resistor 2a from the state of FIG.
a and 13b and a change 14 in the vertical deflection magnetic field are shown. That is, FIG. 13A shows the electron beam 15 on the upper side of the screen.
FIG. 13B shows the case where the electron beams 15B, 15G and 15R are deflected to the lower side of the screen when B, 15G and 15R are deflected. The electron beams 15B, 15G,
15R and the electron beam 15B, 1
When 5G and 15R are deflected, all directions are opposite to each other.

In FIG. 11, by moving the position of the variable terminal 3a of the variable resistor 3 toward the resistor 2a, the value of the resistor connected in parallel to the vertical deflection coil 1a is reduced. Therefore, the amount of the vertical deflection current shunted to the resistor 2a increases, and the value of the current flowing to the vertical deflection coil 1a decreases. As a result, as shown in FIG. 13A or 13B, the direction 13a of the change in the vertical deflection current is the same as the direction 1 of the vertical deflection current shown in FIGS.
The direction is opposite to 2a.

On the other hand, the value of the resistance connected in parallel to the vertical deflection coil 1b increases. For this reason, the amount of the vertical deflection current shunted to the resistor 2b decreases, and the value of the current flowing to the vertical deflection coil 1b increases. As a result, the direction 13b of the change in the vertical deflection current is as shown in FIG.
Or, as shown in (b), FIG.
Of the deflection current 12b.

Therefore, the direction 13 of the change in the vertical deflection current
When the orientations a and 13b are in such directions, the change 14 in the vertical deflection magnetic field becomes a quadrupole magnetic field component as shown in FIG. 13A or 13B. For this reason, both ends of the electron beams 15B and 15R are shown in FIG.
As shown in (1), deflection forces 16B and 16R are applied. Here, focusing on the blue beam 15B, as shown in FIG. 13A, the electron beams 15B, 15G, 15R
Is deflected, a deflecting force 16B acts downward, and
As shown in FIG. 13B, the electron beam 15
When B, 15G and 15R are deflected, the deflection force is 1 upward.
6B works.

Although the case where the position of the variable terminal 3a of the variable resistor 3 shown in FIG. 11 is moved to the resistor 2a side has been described so far, the position of the variable terminal 3a of the variable resistor 3 is changed to the side of the resistor 2b. Is moved in the opposite direction to that described above.

Next, FIG. 14 is an explanatory diagram showing a change in the convergence pattern on the fluorescent screen 17, and FIG.
14A shows the case where the position of the variable terminal 3a of the variable resistor 3 shown in FIG. 4 is moved to the resistor 2a side, and FIG.
The case of moving to the b side is shown. The position of the variable terminal 3a of the variable resistor 3 is at the midpoint before being moved, and at this time, the state on the phosphor screen 17 is the horizontal line 1 of the blue beam.
Assuming that the horizontal line 18B of the red beam coincides with the horizontal line 18B of the red beam,
By moving the position of the variable terminal 3a of the variable resistor 3 toward the resistor 2a, the horizontal line 18B of the blue beam moves inward of the screen as shown in FIG. Conversely, resistance 2
When moving to the b side, the horizontal line 18B of the blue beam moves in the direction outside the screen.

As described above, in the deflection yoke shown in FIG. 11, the horizontal line 18B of the blue beam and the horizontal line 18R of the red beam simultaneously move in the upper and lower sides of the screen at the same time, respectively. The horizontal misalignment at the end can be corrected.

[0014]

However, as described above, in the conventional deflection yoke provided with the means for correcting the YV miscon, the current flowing through each of the vertical deflection coils located on the left and right of the receiving tube is interposed. There is a problem that the raster distortion is deteriorated due to the operation.

That is, for example, in the conventional circuit shown in FIG. 11, when the variable resistor 3 is moved to the means 2a side,
Since a current larger than the left vertical deflection coil 1a flows to the right vertical deflection coil 1b when viewed from the phosphor screen,
As shown in FIG. 15A, the magnetic flux generated by the right coil becomes larger than the magnetic flux generated by the left coil. As shown in FIG. 16A, the raster on the right side of the screen becomes larger than the left side of the screen. This produces a so-called positive horizontal trapezoidal distortion. Further, when the variable resistor 3 is moved to the resistor 2b side, a difference between the left and right magnetic fluxes occurs as shown in FIG. 15B, as shown in FIG. A so-called negative horizontal trapezoidal distortion in which the raster on the left side of the screen becomes large has occurred.
Therefore, in the conventional deflection yoke, misconvergence of a horizontal line as shown in FIG. 14 cannot be corrected without side effects.

Therefore, the present invention solves the above-mentioned problems of the prior art, and provides the misconvergence shown in FIG.
It is another object of the present invention to provide a deflection yoke capable of simultaneously and independently correcting the horizontal trapezoidal distortion shown in FIG.

[0017]

According to a first aspect of the present invention, there is provided a deflection yoke mounted on a color picture tube having three electron guns arranged in an in-line arrangement. A correction coil device connected to the vertical deflection coil on the small-diameter opening end side of the deflection yoke main body including a pair of vertical deflection coils disposed on the horizontal axis of the in-line arrangement; At least two sets of coils each having a reciprocating pole thereon, at least two sets of coils each having a reciprocating pole at an upper diagonal of the horizontal axis, and a reciprocating pole each at a lower diagonal of the horizontal axis; A series of six coils consisting of at least two sets of coils having a vertical line convergence correction in one direction and correcting a vertical line convergence deviation in the other direction Six coils are connected in series, two sets of the six coils are connected in series, and a first variable resistor for adjusting a correction current is arranged at one end of the parallel connection. did.

According to a second aspect of the present invention, a pair of vertical deflection coils arranged on the left and right sides of the color picture tube are connected in series with each other, and a variable terminal of a second variable resistor is connected to an intermediate connection point. One end of the second variable resistor is connected to a first terminal of the vertical deflection coil via a resistor, and the other end of the second variable resistor is connected to the first terminal of the vertical deflection coil via a resistor. Connected to a second terminal, further connected in series to a variable terminal of the first variable resistor of the correction coil device and the second terminal, and adjusted horizontal trapezoidal distortion by the second variable resistor. The vertical convergence deviation of the horizontal line caused by the side effect can be adjusted by the first variable resistor.

[0019]

According to the first and second aspects of the present invention, YV miscon and horizontal trapezoidal distortion can be adjusted independently of each other, whereby horizontal convergence can be adjusted while maintaining the quality of raster distortion. And the residual misconvergence can be reduced.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a top view of a deflection yoke according to an embodiment of the present invention, FIG. 2 is a rear view of the deflection yoke, and FIG. 3 is a circuit diagram of the deflection yoke. 4, 5, 6,
FIGS. 7, 8, and 9 are explanatory diagrams of a method of correcting the YV miscon and horizontal trapezoidal distortion of the deflection yoke, and FIG. 10 is a waveform diagram of a current flowing through the vertical deflection circuit when the deflection yoke is deflected to the upper side of the screen. FIGS. 4 to 9 show magnetic fluxes generated by the vertical deflection coil during the deflection on the screen when the vertical deflection current shown by the solid line in FIG. 10 flows, the state of the horizontal trapezoidal distortion at that time, and the correction coil. And the convergence state of the horizontal line at the top of the screen at that time.

In FIG. 1, 5 is a separator, 6 is a core, and 7 is a substrate. The vertical deflection coil 8 has a saddle shape, and includes two coils 8a and 8b.
10a and 10b are resistors connected in parallel to the vertical deflection coils, 20 is a variable resistor for adjusting the current flowing in each of the two vertical deflection coils, 21 is a variable resistor for adjusting the current flowing in the correction coil, and 22 is Bypass resistor, 23 is a magnetic piece, 30a to 30f are correction coils for correcting horizontal line deviation in one direction, and 31a to 31f are correction coils for correcting horizontal line deviation in the other direction. Six coils are connected in series. The respective correction coils are connected in parallel.

In the above configuration, when a vertical deflection current indicated by a solid line in FIG. 10 flows, that is, when the screen is deflected upward, the vertical deflection current passes through the vertical deflection coils 8a and 8b and passes through the variable resistor 21. Via the correction coils 30a to 30
f, and 31a-31f. The vertical deflection coils 8a and 8b and the correction coils 30a to 30 at that time
The magnetic fluxes generated by f and 31a to 31f are as shown in FIGS.

First, the variable terminal 20a of the variable resistor 20
When the variable resistor 21 is at the midpoint, the currents flowing through the vertical deflection coils 8a and 8b, and the correction coils 30a to 30f and the correction coils 31a to 31f are equal. Therefore, as shown in FIG. 4A, the vertical deflection coils 8a and 8b
Are generated, the horizontal trapezoidal distortion of the raster does not change as shown in FIG. 4B, and the correction coils 30a to 30f and the correction coil 31a as shown in FIG.
Since the magnetic fluxes generated by .about.31f are equal and cancel each other, the convergence at the upper end of the screen does not change as shown in FIG. 5B.

Next, when the position of the variable terminal 20a of the variable resistor 20 is moved toward the resistor 10a, the value of the resistor connected in parallel to the vertical deflection coil 8a decreases. Therefore, the amount of the vertical deflection current shunted to the resistor 10a increases, and the value of the current flowing to the vertical deflection coil 8a becomes smaller than the current flowing to the vertical deflection coil 8b. for that reason,
As shown in FIG. 6A, the magnetic flux generated by the vertical deflection coil 8b becomes larger than the magnetic flux generated by the vertical deflection coil 8a, and as shown in FIG.
The right side has a large positive horizontal trapezoidal distortion. At this time, the misconvergence of the horizontal line at the upper end of the screen is represented by the horizontal line 18B of the blue beam and the horizontal line 18B of the red beam as shown in FIG.
It shifts inward from R. At this time, by moving the position of the variable terminal of the variable resistor 21 to the correction coils 30a to 30f, the value of the current flowing to the correction coils 30a to 30f becomes larger than the current flowing to the correction coils 31a to 31f. The magnetic flux generated by the correction coils 30a to 30f increases, and as shown in FIG. 7A, an upward deflecting force 16B acts on the blue beam, and a downward deflecting force 16R acts on the red beam. 7) can be eliminated as shown in FIG. 7B.

When the position of the variable terminal 20a of the variable resistor 20 is moved toward the resistor 10b, the value of the resistor connected in parallel to the vertical deflection coil 8b decreases. Therefore, the amount of the vertical deflection current shunted to the resistor 10b increases, and the value of the current flowing to the vertical deflection coil 8b becomes smaller than the current flowing to the vertical deflection coil 8a. for that reason,
As shown in FIG. 8A, the magnetic flux generated by the vertical deflection coil 8a becomes larger than the magnetic flux generated by the vertical deflection coil 8b. As shown in FIG.
The left side has a large negative horizontal trapezoidal distortion. At this time, the misconvergence of the horizontal line at the upper end of the screen is represented by the horizontal line 18B of the blue beam and the horizontal line 18B of the red beam as shown in FIG.
It shifts outward with respect to R. At this time, the position of the variable terminal 20a of the variable resistor 21 is adjusted by the correction coils 31a to 31.
By moving to the f side, the correction coils 31a to 31
Since the value of the current flowing to the f side becomes larger than the current flowing to the correction coils 30a to 30f, the correction coils 31a to 31f
The magnetic flux generated by f becomes large, and as shown in FIG. 9A, a downward deflecting force 16B acts on the blue beam, and an upward deflecting force 16R acts on the red beam, and the misconvergence shown in FIG. Can be solved as shown in FIG.

Similarly, when deflecting to the lower side of the screen,
Since only the direction of the magnetic flux when the screen is deflected upward is reversed, positive horizontal trapezoidal distortion, negative horizontal trapezoidal distortion, YV miscon inside the blue beam horizontal line (with respect to the red beam horizontal line), blue beam horizontal line It is possible to independently adjust the outer YV miscons.

In this embodiment, two sets of six correction coils are used. However, two sets of coils wound in such a manner that magnetic fluxes are generated in opposite directions on a horizontal axis in an in-line arrangement are connected in parallel. A connection method is also possible.

[0028]

According to the present invention, it is possible to easily adjust horizontal trapezoidal distortion and YV mis-cons, which were conventionally incompatible with each other, so that it is possible to cope with the increasingly severe standards of deflection distortion and convergence of computer display devices in recent years. A high-definition deflection yoke for an in-line type color picture tube can be realized.

[Brief description of the drawings]

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

FIG. 2 is a rear view of the deflection yoke according to the embodiment of the present invention.

FIG. 3 is a circuit diagram of a deflection yoke according to the embodiment of the present invention.

FIG. 4 shows Y of a deflection yoke according to an embodiment of the present invention.
Illustration of V miscon and horizontal trapezoidal distortion correction method

FIG. 5 illustrates a deflection yoke Y according to an embodiment of the present invention.
Illustration of V miscon and horizontal trapezoidal distortion correction method

FIG. 6 shows Y of the deflection yoke according to the embodiment of the present invention.
Illustration of V miscon and horizontal trapezoidal distortion correction method

FIG. 7 shows Y of the deflection yoke according to the embodiment of the present invention.
Illustration of V miscon and horizontal trapezoidal distortion correction method

FIG. 8 shows Y of the deflection yoke according to the embodiment of the present invention.
Illustration of V miscon and horizontal trapezoidal distortion correction method

FIG. 9 shows a deflection yoke Y according to an embodiment of the present invention.
Illustration of V miscon and horizontal trapezoidal distortion correction method

FIG. 10 is a waveform diagram of a current flowing in a vertical deflection circuit when deflection is performed to an upper side of a deflection yoke screen according to an embodiment of the present invention.

FIG. 11 is a circuit diagram of a conventional deflection yoke.

FIG. 12 is a sectional view of a vertical deflection coil of a conventional deflection yoke.

FIG. 13 is a sectional view of a vertical deflection coil of a conventional deflection yoke.

FIG. 14 is an explanatory diagram showing a change in a convergence pattern on a conventional screen.

FIG. 15 is an explanatory diagram showing a change in a vertical deflection coil magnetic flux of a conventional deflection yoke.

FIG. 16 is an explanatory diagram showing a change in horizontal trapezoidal distortion of a conventional deflection yoke.

[Explanation of symbols]

 8a, 8b Vertical deflection coil 10a, 10b Resistance 11 Vertical deflection magnetic field 15B, 15G, 15R Electron beam 16B, 16R Deflection force applied to current beam 18B Horizontal line of blue beam 18R Horizontal line of red beam 20, 21 Variable resistor 22 Bypass resistor 23 Magnetic piece 30a-30f Correction coil 31a-31f Correction coil

Claims (2)

[Claims] 1. A deflection yoke mounted on a color picture tube having three electron guns arranged in-line, comprising a pair of vertical deflection coils disposed on the left and right of the color picture tube with the color picture tube interposed therebetween. A correction coil device connected to the vertical deflection coil on the small-diameter opening end side of the deflection yoke main body, wherein the correction coil device has at least two sets of reciprocating poles on a horizontal axis in an in-line arrangement. And at least two sets of coils each having a reciprocating pole at the upper diagonal of the horizontal axis, and at least two sets of coils each having a repelling pole at the lower diagonal of the horizontal axis, A series connection of six coils for correcting the deviation of the vertical convergence of the horizontal line in one direction, and a series connection of six coils for correcting the deviation of the vertical convergence of the horizontal line in the other direction, 2 One of the coils are respectively connected in series
A deflection yoke, wherein a pair of coils are connected in parallel, and a first variable resistor for adjusting a correction current is arranged at one end of the parallel connection. 2. A pair of vertical deflection coils disposed on the left and right sides of the color picture tube are connected in series to each other, and a variable terminal of a second variable resistor is connected to an intermediate connection point between the coils. Of the variable resistor is connected to a first terminal of the vertical deflection coil via a resistor, and the other end of the variable resistor is connected to a second terminal of the vertical deflection coil via a resistor. Connecting the variable terminal of the first variable resistor of the correction coil device to the second terminal in series,
2. The horizontal variable trapezoidal distortion is adjusted by the second variable resistor, and a deviation of the horizontal convergence of the horizontal line caused by a side effect thereof can be adjusted by the first variable resistor. A deflection yoke as described.