JPH06139954A - Color cathode-ray tube device - Google Patents

Abstract

PURPOSE:To enable the dislocation of electron beam convergence to be easily corrected externally, regarding an in-line type color cathode-ray tube. CONSTITUTION:A convergence correction device 20 is provided to correct the convergence dislocation of an electron beam via the external supply of an electrical signal to the external surface of the neck section 5 of a color cathode- ray tube. The device 20 has a plurality of coils 22b to 22c laid in such a way as generating quadrupole magnetic field along the center direction of the tube axis of the neck section 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color CRT device, and more particularly to a convergence correction device for an in-line self-convergence color CRT.

[0002]

2. Description of the Related Art A schematic structure of an in-line self-convergence type color CRT is shown in FIG. Reference numeral 1 is a color cathode ray tube body, and a panel 3 having a phosphor screen 2 formed on the inner surface thereof.
And a funnel 4 having a substantially pyramidal shape connected to the panel, and a cylindrical neck portion 5 connected to the funnel 4. Reference numeral 6 denotes an electron gun provided in the neck portion 5, which generates three electron beams in an in-line (horizontal line) shape around the tube axis of the neck portion 5. Reference numeral 7 is a base for supplying an operating voltage to the electron gun 6. Reference numeral 8 denotes a shadow mask which is arranged so as to face the phosphor screen 2, and selectively emits three electron beams from the electron gun 6 to the phosphors which emit red, blue and green colors forming the phosphor screen 2. It is for making them hit.
Denoted at 9 is a deflection yoke arranged on the outer periphery of the joint portion of the funnel 4 and the neck portion 5 for deflecting the electron beam over the entire phosphor screen 2 and focusing the three electron beams. Reference numeral 10 denotes a convergence purity magnet (hereinafter referred to as a CP magnet) attached to the neck portion 5 so as to surround the electron gun 6 behind the deflection yoke 9.
Color purity and static convergence are adjusted in the central portion of the phosphor screen 2 for the three electron beams from the electron gun 6.

FIG. 9 shows a schematic structure of the CP magnet 10. Three sets of magnets consisting of a pair of ring-shaped magnets, that is, two-pole magnets 11a and 11b, four-pole magnets 12a and 12b, and six-pole magnet 13a, 13b and a spacer that regulates the gap between the magnets of each set
14a, 14b, 14c, 14d. The stopper ring 15 prevents the entire body from rotating, and the screw 16 is tightened to fix the entire body to the neck portion 5.

In FIG. 8, in order to project an image on the panel 3, three electron beams emitted from the electron gun 6 are deflected by the deflection yoke 9 over the entire screen, and an arbitrary hole of the shadow mask 8 is formed. It must be correctly applied to the phosphor on the phosphor screen 2 defined through the above and focused on the entire screen. In the self-convergence type color cathode-ray tube, the focusing (convergence) of three electron beams in the peripheral part with respect to the center of the screen needs to be corrected especially from the outside if the magnetic field distribution of the deflection yoke 9 is appropriately determined. There is no.

In this case, the color purity of the entire screen is adjusted by C
The two-pole magnets 11a and 11b of the P magnet 10 are used. The two-pole magnets 11a and 11b have a magnetic pole configuration as shown in FIG. 10, and the strength of the magnetic field can be changed by the mutual opening angle, and the direction of the magnetic field can be changed by setting both rotation angles.
Therefore, by adjusting the two-pole magnets 11a and 11b,
It is possible to move three electron beams in the same direction by the same amount in the entire area of the screen so that the electron beams can be correctly projected onto the defined phosphor through any holes of the shadow mask. On the other hand, 4
The pole magnets 12a and 12b and the 6-pole magnets 13a and 13b have the magnetic pole configurations shown in FIGS. 11 and 12, respectively. The magnetic field strength is changed by the mutual opening angle, and the magnetic field is set by setting the entire rotation angle. You can change the direction of. Therefore, 4-pole magnet 12
By setting a and 12b, the electron beams (corresponding to red and blue) only on both sides of the electron gun 6 are moved by the same amount in different directions over the entire screen, and as shown in FIG. The electron beams (red, blue) can be converged. Further, by using the 6-pole magnets 13a and 13b, the electron beams (red and blue) only on both sides of the electron gun 6 are moved in the same direction by the same amount in the entire area of the screen, and as shown in FIG. Convergence between the red and blue) and the central electron beam (green) can be performed.

As described above, the two-pole magnets 11a, 11b and the four-pole magnet
12a, 12b and 6-pole magnets 13a, 13b can be used to adjust the color purity and the convergence in the entire area of the screen, and after this adjustment is completed, the stop ring 15 is tightened to fix the entire CP magnet 10. . However, in the in-line self-convergence type color cathode-ray tube, since the electron beam emission port of the electron gun 6 is arranged inline around the neck tube axis, for example, the heat of the electron gun 6 and the CP magnet 10 is reduced. Due to changes or the like, the electron beams on both sides are often displaced laterally with respect to the central electron beam as shown in FIG.

[0007]

Since the conventional color cathode ray tube is constructed as described above, for example, once the CP
If the convergence shift occurs after adjusting and fixing the magnet 10, the stop ring 15 must be loosened again and readjusted.If it is installed in the TV set or the display monitor set of the computer, readjustment work is required. It was difficult to do. The present invention has been made to solve the above problems, and an object of the present invention is to provide a color cathode ray tube device equipped with a convergence correction device that can easily correct the convergence deviation from the outside. .

[0008]

A color cathode ray tube device is a fluorescent lamp which is annularly arranged on the outer periphery of a neck portion and which has three electron beams emitted inline around the neck portion tube axis in a color cathode ray tube body. In addition to the convergence device for focusing on the surface, a plurality of coils arranged so as to generate a quadrupole magnetic field in the central direction of the neck tube axis are provided on the outer circumference of the neck, and these coils are electrically connected from the outside. It is provided with a convergence correction device that supplies a signal and corrects the focusing deviation of the electron beam. The convergence correction device has four coils, which are arranged at equal intervals along the inner periphery of the convergence device as a plurality of coils, or at 90 ° intervals on the side surface of the convergence device.
The same amount of magnetic field in different directions is generated in each adjacent coil.

[0009]

In the convergence correction device, an electric signal is externally supplied to a plurality of coils arranged on the outer circumference of the neck portion to generate a quadrupole magnetic field in the central direction of the tube axis of the neck portion. It corrects the focusing deviation of the electron beams on both sides with respect to the beam so that the readjustment of the convergence can be easily performed from the outside even when the color CRT is installed in the TV set or the like.

[0010]

【Example】

Example 1. FIG. 1 is a perspective view showing an essential part of an embodiment of the present invention, in which a CP magnet 10 is composed of three sets of magnets, that is, two-pole magnets 11a and 11b, four-pole magnets 12a and 12b, and a six-pole magnet 13a.
13b and spacers 14a, 14 that regulate the spacing between magnets of each set
b, 14c, and 14d, the rotation of the whole is prevented by the stop ring 15, and the whole is fixed to the neck portion 5 by tightening the screw 16, thereby forming a convergence device. Is the same as.

In FIG. 1, a convergence correction device 20, which is a feature of the present invention, is attached to the inner peripheral portion of a CP magnet 10 and is attached to the neck portion 5 of a color CRT together with the CP magnet 10. As shown in FIG. 2, the convergence correction device 20 includes four coils 22a, 22b, 22 wound in a spiral shape along the inner peripheral surface of the non-magnetic cylindrical body 21.
c and 22d are arranged at equal intervals. The coils 22a, 22b, 22c, 22d are connected in series as shown in FIG. 3, and are energized from the outside through the connector 23 with a lead wire to face toward the center of the neck tube axis of the color CRT. In addition, it is configured to generate magnetic fields in the same amount and in different directions as the adjacent coils.

Therefore, these coils 22a, 22b,
A quadrupole magnetic field as shown in FIG. 4 is formed by the 22c and 22d with respect to the three electron beams arranged in-line around the tube axis in the neck portion 5 of the color CRT. Therefore, by setting the magnetic field distribution by these coils, the electron beams (red and blue) on both sides of the electron gun 6 are moved to the position shown in FIG.
It is possible to correct the convergence deviation of the electron beams on both sides shown in FIG. 14 by moving the same in the directions a and b by a predetermined amount.
Therefore, even if the color CRT is adjusted, for example, even if it is incorporated in a television or a display monitor, it is possible to easily correct it from the outside when the convergence deviation occurs.

Example 2. FIG. 5 shows another embodiment of the present invention, in which another convergence correction device 30, which is a feature of the present invention, is attached to the side surface of the CP magnet 10.
It is attached to the neck part 5 of the color CRT together with the CP magnet 10. This convergence correction device
As shown in FIG. 6, 30 is a rectangular non-magnetic plate body 31 having a through hole 31a at the center thereof and grooves are provided at 90 degree intervals, and four coils 32a, 32b, 32c are provided in these grooves. 32d are arranged respectively, and each coil 32a, 32b, 32c, 32d
Are connected in series in the same manner as the coils of the first embodiment, and are energized from the outside through the connector 33 with a lead wire, so as to face toward the center of the neck tube axis of the color CRT as shown in FIG. It is configured to generate magnetic fields in the same amount and different directions as the matching coils, and as in the case of the first embodiment, it is possible to externally correct the convergence deviation of the electron beams (red and blue) on both sides.

In the above embodiment, the coils of the convergence correction device are arranged diagonally. However, if each coil produces a quadrupole magnetic field in the central direction of the neck tube axis of the color cathode ray tube. Of course, not only the installation direction but also the number of turns of the coil, the presence or absence of an iron core inside the coil, and the like can be arbitrarily selected.

[0015]

As described above, according to the color cathode ray tube device of the present invention, a plurality of color cathode ray tube devices are arranged on the outer periphery of the neck of the main body of the color cathode ray tube so as to generate a quadrupole magnetic field in the central direction of the tube axis of the neck portion. Since a convergence correction device for correcting the focusing deviation of the electron beam is provided by externally supplying electric signals to these coils, even if the convergence adjustment is completed once and it is installed in a TV set or the like. , Convergence deviation can be easily corrected from the outside.

Further, according to the present invention, the convergence correction device comprises a plurality of coils, which are arranged at equal intervals along the inner circumference of the convergence device or at 90 ° intervals on the side face of the convergence device. Since it has a coil and is configured to generate the same amount of magnetic field in the same direction in each adjacent coil, it is possible to easily eliminate the convergence deviation in the in-line type color CRT from the outside without making any special changes to the conventional device. Can be corrected.

[Brief description of drawings]

FIG. 1 is a perspective view of an essential part showing an embodiment of the present invention.

FIG. 2 is a perspective view showing an example of a convergence correction device that is a feature of the present invention.

FIG. 3 is a circuit diagram showing an example of a method of connecting each coil of the convergence correction device in FIG.

FIG. 4 is a diagram illustrating the operation of the convergence correction device in FIG.

FIG. 5 is a side view of an essential part showing another embodiment of the present invention.

FIG. 6 is a perspective view showing another example of the convergence correction device which is a feature of the present invention.

FIG. 7 is a diagram illustrating an operation of the convergence correction device in FIG.

FIG. 8 is a side view showing a schematic structure of a conventional color CRT.

FIG. 9 is a side view of a main part of a conventional convergence device.

FIG. 10 is an operation explanatory view of a two-pole magnet in the conventional convergence device.

FIG. 11 is an operation explanatory view of a quadrupole magnet in a conventional convergence device.

FIG. 12 is an operation explanatory diagram of a 6-pole magnet in a conventional convergence device.

FIG. 13 is a diagram showing a state of convergence of electron beams on both sides of the electron gun.

FIG. 14 is a diagram showing a state of convergence of a central electron beam and double-sided electron beams of an electron gun.

[Explanation of symbols]

 1 Color cathode ray tube body 2 Fluorescent screen 3 Panel 4 Funnel 5 Neck part 6 Electron gun 7 Base 8 Shadow mask 9 Deflection yoke 10 CP magnet 11a, 11b 2 pole magnet 12a, 12b 4 pole magnet 13a, 13b 6 pole magnet 14a, 14b, 14c, 14d Spacer 15 Stop ring 16 Screw 20 Convergence correction device 21 Non-magnetic cylinder 22a, 22b, 22c, 22d Coil 23 Lead wire with connector 30 Convergence correction device 31 Non-magnetic plate 31a Groove 32a, 32b, 32c, 32d Coil 33 Lead wire with connector

Claims (3)

[Claims] 1. An electron gun which is arranged in a neck portion of a color cathode ray tube body and which generates three electron beams in-line around a neck portion tube axis, and an annularly arranged outer periphery of the neck portion, which comprises the above-mentioned three guns. Convergence device for focusing the electron beam on the phosphor screen formed on the color cathode ray tube body, and a plurality of devices arranged on the outer periphery of the neck part so as to generate a quadrupole magnetic field in the center direction of the neck part tube axis. A color CRT device having coils, and a convergence correction device that corrects the focusing deviation of the electron beam by externally supplying electrical signals to these coils. 2. The convergence correction device has, as a plurality of coils, four coils arranged at equal intervals along an inner peripheral portion of the convergence device, and magnetic fields of the same amount and different directions are provided to each adjacent coil. The color cathode-ray tube device according to claim 1, wherein: 3. The convergence correction device has four coils as a plurality of coils, which are arranged at 90 ° intervals on the side surface of the convergence device, and generate the same amount of different magnetic fields in each adjacent coil. The color cathode ray tube device according to claim 1, wherein