JP3324316B2 - Color picture tube equipment - Google Patents

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 having a built-in in-line type electron gun, a self-convergence type deflection yoke mounted on the color picture tube, and an electron gun side end of the deflection yoke. A color image receiving system comprising: a pair of coma aberration correcting coils disposed opposite to each other above and below; and a differential type shunt circuit connected in parallel to a series connection of the pair of coma aberration correcting coils. It relates to a pipe device.

[0002]

2. Description of the Related Art Generally, a deflection yoke of a self-convergence type mounted on a color picture tube having a built-in in-line type electron gun generates a horizontal deflection magnetic field distorted like a pincushion and a vertical deflection magnetic field distorted like a barrel. Generate.
If the winding accuracy of the horizontal deflection coil and the vertical deflection coil and the assembly accuracy vary, or if there is an error in the combination of the deflection yoke and the color picture tube, the screen shown in FIG. ), Misconvergence due to misalignment tends to occur.

Among the misconvergences shown in FIG. 5A, a vertical misconvergence in which the vertical line of red R deviates from the vertical line of blue B is located on the tube axis 2 of the color picture tube 1 as shown in FIG. On the other hand, the correction can be made by inclining the central axis 4 of the deflection yoke 3 by an angle α in the left-right direction, or attaching a magnet piece 6 near the neck 5 of the color picture tube 1 as shown in FIG. The horizontal line misconvergence in which the horizontal line of the red R deviates from the horizontal line of the blue B is caused by the two fixed resistors 8a and 8b and the variable resistance of the series connection of the pair of vertical deflection coils 7a and 7b as shown in FIG. This can be corrected by connecting a differential type shunt circuit composed of the resistor 9 in parallel.

Further, among misconvergences as shown in FIG.
The horizontal line misconvergence which deviates from the horizontal line in the rotational direction is caused by tilting the center axis 4 of the deflection yoke 3 with respect to the tube axis 2 of the color picture tube 1 in the vertical direction,
The correction can be made by providing the differential coil 11 at the parallel connection point of the pair of horizontal deflection coils 10a and 10b. A vertical misconvergence in which the vertical line of red R deviates from the vertical line of blue B in the rotation direction at the top and bottom of the screen is caused by a pair of vertical deflection coils 7a and 7b connected in series as shown in FIG. Is connected in parallel to a series connection of the coma aberration correcting coils 12a and 12b, and a differential type shunt circuit composed of two fixed resistors 13a and 13b and a variable resistor 14,
The correction can be performed by causing a difference in the current flowing through each of the pair of coma aberration correction coils 12a and 12b.

[0005]

However, FIG.
When the vertical line misconvergence is corrected by applying the circuit shown in (1), when the horizontal / vertical deflection frequency changes with the switching of the display mode, it flows to each of the pair of coma aberration correcting coils 12a and 12b. There has been a problem that the current ratio changes and the initially set convergence condition is broken.

Accordingly, an object of the present invention is to correct coma aberration correction in a case where a differential shunt circuit is connected in parallel to a series connection of a pair of coma aberration correction coils to correct vertical line misconvergence. It is an object of the present invention to provide a color picture tube device in which the ratio of the current flowing through the coil is maintained substantially constant regardless of the switching of the vertical deflection frequency.

[0007]

According to the present invention, there is provided a color picture tube having a built-in in-line type electron gun, and a self-convergence type deflection mounted on the color picture tube. A yoke, a pair of coma aberration correcting coils disposed above and below the electron gun side end of the deflection yoke, and a series connection of a pair of coma aberration correcting coils, which are connected in parallel. A pair of coma aberration correcting coils are connected in series to a pair of vertical deflection coils of the deflection yoke, and the differential type shunt circuit is provided with a pair of coils when the deflection frequency is switched. Frame yield
Color picture tube apparatus is provided which is characterized in that it has a inductor to the current ratio of the differential correction coils is constant. In addition, a color picture tube with a built-in in-line electron gun, a self-convergence type deflection yoke attached to this color picture tube, and an upper and lower end of the electron gun side end of this deflection yoke are arranged opposite to each other. And a differential shunt circuit connected in parallel to a series connection of a pair of coma aberration correcting coils.
The pair of coma aberration correction coils are connected in series to a pair of vertical deflection coils of the deflection yoke, and the differential type shunt circuit is variable.
Resistor, and an inductor is connected in series with the variable resistor.
Color picture tube apparatus is provided which is characterized in that it is continued.

[0008]

According to the present invention, the differential type shunt circuit connected in parallel to the series connection of a pair of coma aberration correcting coils has an inductor component. Even if the impedance of the coil for change changes, the impedance of the shunt circuit also changes, so that the ratio of the current flowing through each of the pair of coma aberration correction coils can always be kept substantially constant.

[0009]

Next, an embodiment of the present invention will be described with reference to the drawings.

In the embodiment shown in FIGS. 1 and 2,
Color picture tube 1 with built-in in-line electron gun 15
6, a deflection yoke 17 of a self-convergence type is mounted. The deflection yoke 17 has a pair of horizontal deflection coils 18a and 18b and a pair of vertical deflection coils 19a and 19a.
19b. A pair of vertical deflection coils 19a, 1
9b are connected in series with each other and connected in series with a pair of coma aberration correction coils 20a and 20b. A pair of upper and lower U-shaped cores 21a and 21b are disposed at the electron gun side end of the deflection yoke 17 so as to face each other.
A pair of comatic aberration correcting coils 20a and 20b are wound around a pair of U-shaped cores 21a and 21b, respectively.

For a series connection of a pair of vertical deflection coils 19a and 19b, a shunt circuit of a differential type comprising two fixed resistors 22, 23 and a variable resistor 24 (horizontal line misconvergence correction circuit shown in FIG. 8) Are connected in parallel. A pair of coma aberration correcting coils 20
a, 20b, two fixed resistors 2
5, 26, a differential shunt circuit composed of a variable resistor 27 and an inductor 28 are connected in parallel. This shunt circuit is for correcting the vertical vertical line misconvergence shown in FIG. 5B.

If the vertical deflection frequency is 60 Hz, and the currents flowing through the pair of coma aberration correcting coils 20a and 20b and the inductor 28 are I ₁ , I ₂ and I ₃ , the vertical deflection is accompanied by the switching of the display mode. Frequency 12
When the frequency is changed to 0 Hz, the impedance of the inductor 28 is doubled, so that the current I ₃ is suppressed from becoming larger than the current I ₂ . That is, it is possible to prevent the current ratio I ₁ / I ₂ from greatly changing and causing a deviation in the convergence condition.

In the above-described embodiment, the inductor 28 is connected to the movable electrode side of the variable resistor 27. However, as in the embodiment shown in FIG. 3, two inductors 28a and 28b are connected to two fixed resistors 25 and 26. May be connected in series.
Also, as in the embodiment shown in FIG.
Instead of 5 and 26, two inductors 28a and 28b may be used.

In the above-described embodiment, a U-shaped core is used as the core of the coma aberration correcting coil. However, an E-shaped core may be used. Whatever can be generated may be used.

[0015]

As described above, according to the present invention, even if the vertical deflection frequency changes with the switching of the image display mode,
As a result, the convergence condition is not deviated, and an image can be satisfactorily displayed in any of the plurality of modes.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a main part of a color picture tube device according to an embodiment of the present invention.

FIG. 2 is an electric circuit diagram of a main part of the color picture tube device according to one embodiment of the present invention;

FIG. 3 is an electric circuit diagram of a main part of a color picture tube device according to another embodiment of the present invention.

FIG. 4 is an electric circuit diagram of a main part of a color picture tube device according to another embodiment of the present invention.

FIG. 5 is a diagram showing a pattern of misconvergence caused by axis misalignment.

FIG. 6 is an explanatory diagram of a conventional misconvergence correction unit.

FIG. 7 is an explanatory diagram of a conventional misconvergence correction means.

FIG. 8 is an electric circuit diagram of a conventional misconvergence correction means.

FIG. 9 is an electric circuit diagram of a conventional misconvergence correction means.

FIG. 10 is an electric circuit diagram of a conventional misconvergence correction means.

[Explanation of symbols]

 REFERENCE SIGNS LIST 15 electron gun 16 color picture tube 17 deflection yoke 19 a, 19 b vertical deflection coil 20 a, 20 b coma aberration correction coil 21 a, 21 b U-shaped core 25, 26 fixed resistor 27 variable resistor 28, 28 a, 28 b inductor

Claims (2)

(57) [Claims] 1. A color picture tube having a built-in in-line type electron gun, a self-convergence type deflection yoke mounted on the color picture tube, and an upper and lower end of an electron gun side end of the deflection yoke. A pair of coma aberration correcting coils and a differential type shunt circuit connected in parallel to a series connection of a pair of coma aberration correcting coils. The coil is connected in series to a pair of vertical deflection coils of a deflection yoke, and a differential type shunt circuit is provided.
Is for correcting a pair of coma aberrations when the deflection frequency is switched
Color picture tube apparatus characterized by having an inductor to the current ratio of the coils is constant. 2. A color picture tube having a built-in in-line type electron gun, a self-convergence type deflection yoke mounted on the color picture tube, and an upper and lower end of an electron gun side end of the deflection yoke. A pair of coma aberration correcting coils and a differential type shunt circuit connected in parallel to a series connection of a pair of coma aberration correcting coils. The coil is connected in series with a pair of vertical deflection coils of the deflection yoke, and the differential type shunt circuit has a variable resistor, and the inductor is connected in series with the variable resistor.
A color picture tube device, wherein the color picture tube device is connected to the color picture tube device.