JPH10150669A - Cathode-ray tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To extend the effective adjustment range of a variable resistor of a deflection yoke by providing a variable resistor which has a similar function in addition to another variable resistor. SOLUTION: A series connection body of a 1st fixed resistor 3, a 1st variable resistor 5, and a 2nd fixed resistor 4 is connected in parallel to a series connection body of a 1st vertical coil half body 1 and a 2nd vertical coil half body 2, and the slider of the 1st variable resistor 5 is connected to the connection point between the 1st vertical coil half body 1 and 2nd vertical coil half body 2. Then the 2nd variable resistor 6 is connected in parallel to the 1st variable resistor 5, and the slider of this 2nd variable resistor 6 is connected to the connection point between the 1st vertical coil half body 1 and 2nd vertical coil half body 2. Namely, the variable resistor 6 which is different from the fixed resistor 3 and has the function similar to that of the variable resistor 5 is provided. Therefore, the effective adjustment range is expanded by optionally adjusting the variable resistors 5 and 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cathode ray tube, and more particularly to an improvement in a deflection yoke provided in the cathode ray tube.

[0002]

2. Description of the Related Art As is well known, a deflection yoke provided in a cathode ray tube is wound around a pair of clad-shaped horizontal deflection coils and a pair of clad or toroidal shapes inside a trumpet-shaped core. And vertical deflection coils connected in series with each other.

[0003] By driving the horizontal deflection coil and the vertical deflection coil, the electron beam from the electron gun is deflected so that it is irradiated on the phosphor surface on the display surface, for example, from the upper left to the lower right.

In recent years, in such a vertical deflection coil, the amount of deflection current flowing in each of a first vertical coil half and a second vertical coil half which are arranged opposite to each other and connected in series has been changed. The composition came to be known.

[0005] With this configuration, it is possible to easily take measures against misconvergence called Yv on the screen of the cathode ray tube without attaching a convergence yoke or the like.

Specifically, a series connection of a first fixed resistor, a variable resistor, and a second fixed resistor is connected in parallel with a series connection of a first vertical coil half and a second vertical coil half. The slider of the variable resistor is connected to a connection point between the first vertical coil half and the second vertical coil half (see JP-A-7-222184).

[0007]

However, in the deflection yoke having such a configuration, the amount of correcting the misconvergence called Yv can be increased by increasing the resistance value of the variable resistor.

This means that when the variable resistance is maximized or minimized, the values of the resistors connected in parallel to the first and second vertical coil halves are unbalanced.

As a side effect in this case, there occurs a phenomenon in which scanning lines are displaced or folded at the upper end of the raster on the screen, so that normal display cannot be performed and a vertical raster size is reduced. This phenomenon also depends on the circuit constant of the cathode ray tube.

The variable resistor is provided mainly for adjustment on the maker side of the cathode ray tube.
Normally, the resistance value is fixed when the convergence becomes the best.

For this reason, it has been pointed out that the convergence cannot be adjusted on the user side.

Further, even when the resistance value of the variable resistor is not fixed on the manufacturer side, if the resistance value after the convergence adjustment is maximum or minimum, the resistance value is increased or decreased further. Adjustment will not be possible.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a cathode ray tube capable of expanding an effective adjustment range of a variable resistor of a deflection yoke.

It is another object of the present invention to provide a cathode ray tube capable of adjusting convergence even on the user side.

[0015]

In order to achieve such an object, the present invention basically provides a pair of clad-type horizontal deflection coils and a pair of clad-shaped or toroidal coils which are wound in series with each other. A vertical yoke having a vertical deflection coil connected thereto, wherein the vertical deflection coil is capable of varying a current flowing through a first vertical coil half and a second vertical coil half which are arranged opposite to each other. Is connected to the cathode ray tube, characterized by being provided with another variable resistor which is separate from the variable resistor and has the same function as the variable resistor. Things.

In the cathode ray tube constructed as described above, by providing a separate variable resistor in addition to the conventionally provided variable resistor, the effective adjustment range can be adjusted by arbitrary adjustment of each of the variable resistors. Can be expanded.

For this reason, even if a bad effect such as a variation in the scanning line or a turn-up occurs at the upper end of the raster on the screen, adjustment for eliminating the problem can be performed.

Further, even if the resistance value of one variable resistor is fixed after the convergence is adjusted on the maker side, the convergence can be adjusted on the user side using the other variable resistor.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG . FIG. 1 is a main part configuration diagram showing one embodiment of a cathode ray tube according to the present invention, and shows a circuit diagram of a vertical deflection coil of a deflection yoke.

In FIG. 1, first, a first vertical coil half 1 and a second vertical coil half 2 which are arranged to face each other are connected in series.

A first fixed resistor 5, a first variable resistor 5, a second fixed resistor 4, and a first fixed resistor 5 are connected in parallel with the series connection of the first vertical coil half 1 and the second vertical coil half 2. Are connected, and the slider of the first variable resistor 5 is connected to a connection point between the first vertical coil half 1 and the second vertical coil half 2.

A second variable resistor 6 is connected in parallel with the first variable resistor 5, and a slider of the second variable resistor 6 includes the first vertical coil half 1 and the second vertical coil It is connected to the connection point with the half 2.

In the deflection yoke configured as described above, it is assumed that the slider of the variable resistor 5 is positioned at the middle point of the variable resistor 5 and the fixed resistor connected to the first vertical deflection coil 1 side. If the resistance of the resistor 3 is R3 and the resistance of the fixed resistor 4 connected to the second vertical deflection coil 2 is R4, and the relationship of R3> R4 is always satisfied, the vertical deflection coils 1, 2 The currents i ₁ and i ₂ flowing through have a relationship of i ₁ <i ₂ .

For example, when the vertical deflection coil is of a clad type, the first vertical deflection coil 1 is located on the left side as viewed from the cathode ray tube screen, and the second vertical deflection coil 2 is located on the right side as viewed from the cathode ray tube screen. This is equivalent to always setting the right vertical deflection coil 2 closer to the cathode ray tube.

For this reason, it is possible to easily take measures against raster distortion on the screen caused by imbalance between the left and right of the deflection coil and the unbalanced swing of the deflection yoke.

On the contrary, R3 and R4 always satisfy R3 <R
Assuming that the relationship is 4, the currents flowing through the vertical deflection coils 1 and 2 respectively have a relationship of i ₁ > i ₂ , and it is possible to easily take measures against the raster distortion of the pattern opposite to the above-described raster distortion. .

Here, the resistance values R3,
When R4 satisfies R3 <R4 and the slider of the variable resistor 5 is adjusted to the fixed resistor 3, the vertical deflection currents i ₁ and i ₂ flowing through the vertical deflection coils 1 and ₂ are i ₁ ≪ the i _2.

Conversely, when the relationship of R3> R4 is satisfied and the slider of the variable resistor 5 is adjusted to the fixed resistor 4 side, the vertical deflection currents i ₁ and i ₂ flowing through the vertical deflection coils 1 and ₂ Is i ₁
≫i ₂ .

[0029] The relationship between i ₁ «i ₂ or i ₁ »i _2, will be emphasized as the difference R3, R4 large.

As a result, the correction amount of the misconvergence Yv shown in FIG. 4 or 5 can be sufficiently secured.

In this embodiment, another variable resistor 6 which is separate from the fixed resistor 3 and has the same function as the variable resistor 3 is provided.

The provision of the variable resistor 6 allows the effective adjustment range to be expanded by arbitrary adjustment of each of the variable resistors 5 and 6.

For this reason, even if a bad effect such as a variation in scanning lines or a turn-up occurs at the upper end of the raster on the screen, adjustment for eliminating the problem can be performed.

Further, even if the resistance value of one variable resistor 5 is fixed after the convergence is adjusted by the manufacturer, the convergence can be adjusted by using the other variable resistor 6 on the user side. .

Embodiment 2 FIG . FIG. 2 is a main part configuration diagram showing another embodiment of the cathode ray tube according to the present invention, and shows a circuit diagram of a vertical deflection coil of a deflection yoke.

In the figure, first, a first vertical coil half 1 and a second vertical coil half 2 which are arranged to face each other are connected in series.

The second variable resistor 6, the first variable resistor 5, and the fixed resistor 4 are connected in series with the series connection of the first vertical coil half 1 and the second vertical coil half 2. A connecting body is connected, and a slider of the first variable resistor 5 is connected to a connection point between the first vertical coil half 1 and the second vertical coil half 2, and a second variable resistor 6 The slider is connected to a connection point between the second variable resistor 6 and the first variable resistor 5.

It is needless to say that the same effect as in the first embodiment can be obtained also in the case of such a configuration.

Embodiment 3 FIG . FIG. 3 is a main part configuration diagram showing another embodiment of a cathode ray tube according to the present invention, and shows a circuit diagram of a vertical deflection coil of a deflection yoke.

In the figure, first, a first vertical coil half 1 and a second vertical coil half 2 which are arranged to face each other are connected in series.

The second variable resistor 6, the first variable resistor 5, the third variable resistor 7 and the second variable resistor 6 are connected in parallel with the series connection of the first vertical coil half 1 and the second vertical coil half 2. Are connected to a connection point between the first vertical coil half 1 and the second vertical coil half 2, and a slider of the second variable resistor 6 is connected to the first variable resistor 5. The moving element is connected to the connection point between the second variable resistor 6 and the first variable resistor 5, and the slider of the third variable resistor 7 is connected to the third variable resistor 7 and the first variable resistor 5. It is connected to a connection point with the resistor 5.

It is needless to say that the same effect as in the first embodiment can be obtained also in the case of such a configuration.

[0043]

As is apparent from the above description,
According to the cathode ray tube of the present invention, the effective adjustment range of the variable resistor of the deflection yoke can be expanded.

Also, the convergence can be adjusted on the user side.

[Brief description of the drawings]

FIG. 1 is a main part configuration diagram showing one embodiment of a cathode ray tube according to the present invention.

FIG. 2 is a main part configuration diagram showing another embodiment of the cathode ray tube according to the present invention.

FIG. 3 is a main part configuration diagram showing another embodiment of the cathode ray tube according to the present invention.

FIG. 4 is an explanatory diagram showing an example of a pattern of misconvergence Yv.

FIG. 5 is an explanatory diagram showing another example of the pattern of misconvergence Yv.

[Explanation of symbols]

1 first vertical deflection coil, 2 second vertical deflection coil, 3 first fixed resistor, 4 second fixed resistor, 5
... First variable resistor, 6... Second variable resistor, 7... Third variable resistor.

Claims (1)

[Claims] 1. A deflection yoke in which a pair of clad-type horizontal deflection coils and a pair of clad-shaped or toroidally wound vertical deflection coils connected in series are arranged, and the vertical deflection coils are mutually separated. In a cathode ray tube configured by connecting variable resistors capable of varying currents respectively flowing through the first vertical coil half and the second vertical coil half disposed opposite to each other, the cathode ray tube is different from the variable resistor. A cathode ray tube characterized by being provided with another variable resistor having the same function as the variable resistor.