JPH05198274A - In-line type color cathode-ray tube device - Google Patents

Abstract

PURPOSE:To prevent a magnetic substance from shielding magnetic field generated with a color purity correction magnet, and improve screen quality. CONSTITUTION:In an in-line type color cathode-ray tube device where an annular or cylindrical magnetic substance is fitted to the predetermined electrode of an in-line type electron gun 7 in such a way as enclosing a center beam 6G for shielding against leakage magnetic field from the rear side of a deflection yoke 8, a color purity correction magnet 12 comprising an annular bipolar permanent magnet and a pattern deviation correction magnet 22 comprising a quadrupole annular permanent magnet are so arranged as to be adjacent to each other at the rear side of the yoke 8. In addition, a convergence correction magnet 15 comprising an annular quadrupole permanent magnet 13 and an annular hexapole permanent magnet 14 is laid outside a neck 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an in-line type color picture tube device which emits an electron beam arranged in a line consisting of a center beam and a pair of side beams passing through the same plane, and more particularly to its color purity, convergence and pair. The present invention relates to an in-line type color picture tube device capable of satisfactorily correcting the side beam pattern deviation.

[0002]

2. Description of the Related Art Generally, as shown in FIG. 4, an in-line type color picture tube device has an envelope having a panel 1 and a funnel 2 integrally joined to the panel 1,
Formed on the inner surface of the panel 1 is a phosphor screen 3 consisting of three-color phosphor layers that emit blue, green, and red, and a large number of electron beam passage holes are formed inside the phosphor screen 3 facing the phosphor screen 3. Shadow mask 4 has been placed. In addition, in the neck 5 of the funnel 2, the center beam 6G and the pair of side beams 6B and 6R that pass on the same horizontal plane.
An in-line type electron gun 7 that emits three electron beams 6B, 6G, and 6R arranged in a row is arranged. This electron gun 7
On the cathode, such as a cathode, an electrode that controls electron emission from the cathode and focuses the emitted electrons to form an electron beam, and an electrode that accelerates and focuses the electron beam toward the phosphor screen 3. It is composed of a plurality of electrodes arranged in sequence. More funnel 2
3 electron beam emitted from this electron gun 7 outside the
A deflection yoke 8 that generates horizontal and vertical deflection magnetic fields that deflect 6B, 6G, and 6R is mounted.

Then, the three electron beams 6G, 6B and 6R emitted from the electron gun 7 are deflected by the magnetic field generated by the deflection yoke 8 and the phosphor screen 3 is horizontally and vertically scanned to obtain a color image. Is formed to display.

By the way, this in-line type color picture tube device has a circuit-like correction means by making the horizontal deflection magnetic field generated by the deflection yoke 8 a non-uniform magnetic field of pincushion type and vertical deflection magnetic field of barrel type. The pattern on the screen of the pair of side beams 6B and 6R can be matched with each other by the magnetic field generated by the deflection yoke 8 without any need. However, for the pattern of center beam 6G,
It becomes smaller than the pattern of the pair of side beams 6B and 6R, and a convergence shift, which is usually called coma, occurs at the horizontal axis end and the vertical axis end of the screen. Therefore, in a normal in-line type color picture tube device, in order to correct this convergence deviation, there is a field controller that magnetically couples with the rear leakage magnetic field of the deflection yoke 8 on the electrode on the beam emission end side of the electron gun 7. In a color display tube or the like in which a high resolution is required, a center electrode 6G is surrounded by a predetermined electrode 10 of an electron gun to deflect the center beam 6G, as shown in FIG. An annular or cylindrical magnetic body 11 that shields the rear leakage magnetic field of the yoke 8 is arranged.

Further, the in-line type color picture tube device in which the horizontal and vertical deflection magnetic fields of the deflection yoke 8 are non-uniform magnetic fields, the deflection magnetic field causes the three electron beams 6B, 6G and 6R to self-concentrate (self-concentrate) over the entire screen.・ Convergence) However, the central portion of the screen that is not deflected by the deflection yoke 8 cannot be focused. Therefore, in the above-mentioned in-line type color picture tube device, the color purity correction magnets 12 each having a pair of annular two-pole permanent magnets are provided outside the neck 5 in which the electron gun 7 is arranged, and one pair of each. A convergence correction magnet 15 including an annular four-pole permanent magnet 13 and an annular six-pole permanent magnet 14 is arranged.

As shown in FIG. 6 (a), the color purity correction magnet 12 having a pair of two-pole permanent magnets has two magnetic poles (N, S) at 180 ° intervals. The magnetic field shown by the arrow 17 formed by the magnetic poles applies uniform electromagnetic force to the three electron beams 6B, 6G, and 6R and deflects them in the same direction. Further, in the pair of four-pole permanent magnets 13, four magnetic poles are present at 90 ° intervals, as shown in (b), and the magnetic field shown by the arrow 18 formed by the magnetic poles forms a pair of side beams 6B,
Even electromagnetic force is applied in the opposite direction to 6R and they are deflected in opposite directions, but no electromagnetic force is applied to the center beam 6G. Furthermore, a pair of 6-pole permanent magnets
As shown in (c) of FIG. 14, six magnetic poles are present at 60 ° intervals, and the magnetic field indicated by the arrow 19 formed by the magnetic poles is even in the same direction with respect to the pair of side beams 6B and 6R. A central beam 6G though it is deflected in the same direction by applying a strong electromagnetic force.
It does not give an electromagnetic force to.

Further, at the rear portion of the deflection yoke 8, there are three electron beams 6G, 6B, 6R due to an assembling error of the color picture tube.
A pair of annular beams for correcting the pair of side beam patterns 21B and 21R (usually referred to as Xv Bow Pattern) shown in FIG. 7 caused by the fact that the arrangement axis of the above does not coincide with the horizontal axis orthogonal to the tube axis of the color picture tube. A pattern deviation correction magnet 22 composed of a four-pole permanent magnet is arranged.

[0008]

As described above, the in-line type color picture tube device having the electron gun which emits the three electron beams arranged in a row and composed of the center beam and the pair of side beams which pass on the same horizontal plane is deflected. The horizontal deflection magnetic field generated by the yoke is a pincushion type, and the vertical deflection magnetic field is a barrel type non-uniform magnetic field. The patterns on the screen can be matched, but the pattern of the center beam is smaller than the pattern of the pair of side beams, and a convergence shift occurs at the horizontal axis end and the vertical axis end of the screen. Therefore, particularly in a color display tube or the like that requires high resolution, an annular or cylindrical magnetic body that surrounds the center beam and shields the rear leakage magnetic field of the deflection yoke 8 is arranged on a predetermined electrode of the electron gun. ..

Further, the in-line type color picture tube device in which the horizontal deflection magnetic field of the deflection yoke is the pincushion type and the vertical deflection magnetic field is the barrel type, the in-line color picture tube device is 3
Although the electron beam can be self-focused over the entire screen, it cannot be focused in the central part of the screen which is not deflected by the deflection yoke. Therefore, on the outside of the neck where the electron gun is arranged, a pair of ring-shaped two-pole permanent magnets as a set of color purity correction magnets and a pair of ring-shaped four-pole magnets are provided.
A convergence correction magnet including a pole permanent magnet and a 6-pole permanent magnet is arranged.

Further, at the rear part of the deflection yoke, a pattern deviation of a pair of side beams caused by an alignment error of the three-electron beam which does not coincide with the horizontal axis of the color picture tube due to an assembling error of the color picture tube is corrected. A pattern deviation correction magnet composed of a pair of annular four-pole permanent magnets is arranged.

However, as described above, an annular or cylindrical magnetic body surrounding the center beam is arranged on a predetermined electrode of the electron gun, and on the other hand, a two-pole permanent magnet is formed outside the neck where the electron gun is arranged. When the color purity correction magnet and the convergence correction magnet composed of the 4-pole permanent magnet and the 6-pole permanent magnet are arranged, the color purity correction magnet and the convergence correction magnet are usually arranged with the color purity correction magnet on the deflection yoke side. Since the pole permanent magnets and the 6 pole permanent magnets are arranged in this order, the color purity correction magnet composed of a pair of 2 pole permanent magnets is arranged near the magnetic body through the neck. As a result, as shown in FIG. 8, the magnetic field (arrow 17) generated by the color purity correction magnet 12 with respect to the center beam is shielded by the magnetic body 11 and uniform electromagnetic force can be applied to the three electron beams. It becomes impossible to obtain the action originally required for the color purity correction magnet 12. In particular,
Due to the shielding effect of the magnetic body 11, the movement amount of the center beam 6G on the screen is 50 times that of the pair of side beams 6B and 6R.
%, And it becomes impossible to adjust to the desired color purity.

The present invention has been made in order to solve the above-mentioned problems, and an annular or cylindrical magnetic body surrounding a center beam is arranged on a predetermined electrode of an in-line type electron gun, while the color purity is improved. It is an object of the present invention to configure an in-line type color picture tube in which a correction magnet and a convergence correction magnet are arranged so that color purity can be adjusted well.

[0013]

An in-line type electron gun having a plurality of electrodes, which is arranged in a neck of a funnel and emits a row of electron beams composed of a center beam and a pair of side beams, and an outside of the funnel. A deflection yoke that is mounted and that deflects the electron beam emitted from the electron gun, and an annular or cylindrical magnet that is attached to a predetermined electrode of the electron gun so as to surround the center beam and shields from the rear leakage magnetic field of the deflection yoke. A body, a color purity correction magnet composed of an annular two-pole permanent magnet, a convergence correction magnet composed of an annular four-pole permanent magnet and an annular six-pole permanent magnet, and a pattern deviation correction magnet composed of an annular four-pole permanent magnet. In an in-line type color picture tube device equipped with, a color purity correction magnet is provided at the rear of the deflection yoke and no pattern is provided adjacent to the color purity correction magnet. The correction magnets are arranged, 4 neck outside
A convergence correction magnet composed of a pole permanent magnet and a 6 pole permanent magnet was arranged.

Further, a color purity correction magnet is arranged at the rear portion of the deflection yoke, a pattern deviation correction magnet is provided outside the neck, and a 4-pole permanent magnet and 6 are provided adjacent to the pattern deviation correction magnet.
A convergence correction magnet composed of a polar permanent magnet was arranged.

[0015]

As described above, when only the color purity correction magnet and the pattern deviation correction magnet, which are two-pole permanent magnets, or only the color purity correction magnet are arranged in the rear portion of the deflection yoke, the color purity correction magnet is provided with a predetermined electrode of the electron gun. It is possible to prevent the magnetic field from blocking the magnetic field generated by the color purity correction magnet, which is a two-pole permanent magnet, by being positioned away from the magnetic body attached to the. as a result,
An equal electromagnetic force can be applied to the center beam and the pair of side beams.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described based on embodiments with reference to the drawings.

FIG. 1 shows the overall construction of an in-line type color picture tube device which is one embodiment of the present invention, and FIG.

This color picture tube device has an envelope composed of a panel 1 and a funnel 2 integrally joined to the panel 1, and the inner surface of the panel 1 has three-color fluorescent light emitting in blue, green and red. A phosphor screen 3 composed of a body layer is formed, and a shadow mask 4 having a large number of electron beam passage holes formed therein is arranged so as to face the phosphor screen 3. In the neck 5 of the funnel 2, a center beam 6G and a pair of side beams 6B and 6R that pass on the same horizontal plane are arranged in a row to form three electron beams 6B, 6G,
An in-line type electron gun 7 that emits 6R is arranged.

This electron gun 7 has three cathodes (not shown) arranged in a row, and each cathode 3 is heated separately.
A heater (not shown) controls the electron emission from each cathode and focuses the emitted electrons to generate electron beams 6B and 6B.
Electrodes G1 and G2 forming G and 6R and their electron beams 6B and 6
A plurality of electrodes arranged in sequence on the cathode, such as electrodes G3 and G6 that accelerate and focus G and 6R toward the phosphor screen 3.
It is composed of G1 to G6. 3 for each of the electrodes G1 to G6
Three electron beam passage holes are provided corresponding to the respective cathodes. Especially, the center beam 6G passing through the electron beam passage hole is surrounded by the center beam passage hole of the electrode G5. An annular or cylindrical magnetic body 11 that shields the beam 6G from a rear leakage magnetic field of a deflection yoke 8 described later is attached.

On the outside of the funnel 2, the electron gun
A deflection yoke 8 for generating a pincushion-type horizontal deflection magnetic field for horizontally deflecting the three electron beams 6G, 6B, 6R emitted from 7 and a vertical deflection magnetic field for vertically deflecting the three electron beams is mounted.

Further, at the rear portion of the deflection yoke 8, 1
A color purity correction magnet 12 including a pair of two-pole permanent magnets and a pair of four-pole permanent magnets adjacent to the color purity correction magnet 12
A pair of pattern deviation correction magnets 22 is arranged.
Furthermore, on the outside of the neck 5 near the electrode G5 to which the magnetic body 11 is attached, a convergence correction magnet 15 composed of a pair of 4-pole permanent magnet 13 and 6-pole permanent magnet 14 is provided.
Are arranged.

The arrangement of the color purity correction magnet 12, the convergence correction magnet 15 and the pattern shift correction magnet 22 in this color picture tube device is such that the color purity correction magnet 12 is placed in the deflection yoke 8.
It is different from those arranged in the conventional color picture tube device in that it is arranged adjacent to the pattern deviation correction magnet 22 at the rear part.

By the way, when the color purity correction magnet 12 having a pair of two-pole permanent magnets as one set is arranged at the rear portion of the deflection yoke 8 as described above, the color purity correction magnet is conventionally arranged so that the magnet is made of a magnetic material via a neck. It is possible to solve the problem caused by the arrangement in the vicinity. That is, in the conventional color picture tube device, since the color purity correction magnet is arranged in the vicinity of the magnetic body through the neck, the magnetic field generated by the color purity correction magnet is shielded by the magnetic body, and the color purity with respect to the center beam is reduced. The magnetic field generated by the correction magnet could not be applied sufficiently, and the color purity could not be corrected well.However, when the color purity correction magnet 12 is arranged at the rear part of the deflection yoke 8 as in the color picture tube device of this example. , The magnetic field generated by the color purity correction magnet 12 is not shielded by the magnetic body 11, and the electromagnetic force necessary for color purity correction can be evenly applied to the three electron beams 5B, 5G, 5R. The purity can be corrected well. Even if the correction magnets 12, 15, and 22 are arranged, there is no problem in the convergence correction by the convergence correction magnet 15 and the correction of the pattern shift by the pattern shift correction magnet 22. Therefore, the required screen quality is good. It can be a color picture tube device.

Next, another embodiment will be described.

In the above embodiment, the color purity correction magnet and the pattern shift correction magnet are arranged adjacent to the rear part of the deflection yoke, but the color picture tube device shown in FIG. 3 (only the main part is shown).
Is a color purity compensating magnet that has a pair of two-pole permanent magnets as one set.
Are placed at the rear of the deflection yoke 8 and each pair of 4
A convergence correction magnet 15 composed of a pole permanent magnet 13 and a 6-pole permanent magnet 14 is arranged in the vicinity of the magnetic body 11 via the neck 5, and a pair of pairs is provided at the rear portion of the convergence correction magnet 15 (on the side opposite to the deflection yoke 8). The pattern shift correction magnets 22 composed of four-pole permanent magnets are arranged adjacent to each other.

When the color purity correction magnet 12, the convergence correction magnet 15 and the pattern shift correction magnet 22 are arranged in this manner, the color purity correction magnet 12 is arranged at the rear part of the deflection yoke 8 apart from the magnetic body 11, so that As in the embodiment, the magnetic field generated by the color purity correction magnet 12 is not blocked by the magnetic body 11, and the color purity can be adjusted well. Further, even if the pattern shift correction magnet 22 is arranged adjacent to the rear part of the convergence correction magnet 15, the operation is the same as when it is arranged at the rear part of the deflection yoke, and therefore, a color picture tube with a desired desired screen quality is obtained. It can be a device.

In the color picture tube device shown in FIG. 3, the pattern deviation correcting magnet is arranged adjacent to the rear portion of the convergence correcting magnet, but the pattern deviation correcting magnet is a pair of four-pole permanent magnets of the convergence correcting magnet. Since the number of magnets is the same as the number of magnetic poles, the magnets are arranged adjacent to the convergence correction magnet on the side of the deflection yoke, and the convergence correction magnet is arranged, for example, from the deflection yoke side in the order of a pair of 6-pole permanent magnets and a pair of 4-pole permanent magnets. You may arrange.

[0028]

A ring-shaped or two-pole permanent magnet is attached to a predetermined electrode of an in-line type electron gun, which is provided with an annular or cylindrical magnetic body which surrounds the center beam and shields the center beam from the rear leakage magnetic field of the deflection yoke. An in-line color picture tube device in which a color purity correction magnet, a convergence correction magnet including an annular four-pole permanent magnet and an annular six-pole permanent magnet, and a pattern deviation correction magnet including an annular four-pole permanent magnet are arranged, If only the color purity correction magnet and the pattern shift correction magnet or only the color purity correction magnet are arranged adjacent to the rear portion of the deflection yoke, the magnetic field generated by the magnetic body of the color purity correction magnet composed of a pair of two-pole permanent magnets It is possible to prevent the shielding by the body, and it is possible to provide a color picture tube device having a desired screen quality.

[Brief description of drawings]

FIG. 1 is a diagram showing the overall configuration of an in-line type color picture tube device which is an embodiment of the present invention.

FIG. 2 is a diagram showing an arrangement of the electron gun, a color purity correction magnet, a convergence correction magnet, and a pattern shift correction magnet.

FIG. 3 is an electron gun according to another embodiment, a color purity correction magnet,
It is a figure which shows arrangement | positioning of the convergence correction magnet and the pattern shift correction magnet.

FIG. 4 is a diagram showing an overall configuration of a conventional in-line type color picture tube device.

FIG. 5 is a plan view showing electrodes to which a magnetic material of the electron gun is attached.

FIG. 6 (a) is a diagram for explaining the action of a color purity correction magnet composed of a two-pole permanent magnet, and FIG. 6 (b) is a diagram for explaining the action of a four-pole permanent magnet of a convergence correction magnet. FIG. 6C is a diagram for explaining the operation of the 4-pole permanent magnet of the convergence correction magnet.

FIG. 7 is a diagram showing a pattern shift that occurs when an array axis of three electron beams arranged in a line is tilted with respect to a horizontal axis.

FIG. 8 is a diagram for explaining the influence of a magnetic field generated by a color purity correction magnet that is shielded by a magnetic material on a three-electron beam.

[Explanation of symbols]

 2… Funnel 3… Phosphor screen 5… Neck 6B, 6R… Pair of side beams 6G… Center beam 7… In-line electron gun 8… Deflection yoke 11… Magnetic material 12… Color purity correction magnet 13… Quadrupole permanent magnet 14 6-pole permanent magnet 15 Convergence correction magnet 22 Pattern deviation correction magnet

Claims (2)

[Claims] 1. An in-line type electron gun having a plurality of electrodes, which is arranged in a neck of a funnel and emits a row of electron beams consisting of a center beam and a pair of side beams passing through the same plane. A deflection yoke that is mounted on the outside and deflects an electron beam emitted from the electron gun, and is attached to a predetermined electrode of the electron gun so as to surround the center beam and shields the rear leakage magnetic field of the deflection yoke. An annular or tubular magnetic body, a color purity correction magnet made up of an annular two-pole permanent magnet arranged at the rear portion of the deflection yoke, and a color purity correction magnet disposed at the rear portion of the deflection yoke adjacent to the color purity correction magnet. It consists of a pattern deviation correction magnet consisting of an annular four-pole permanent magnet, and an annular four-pole permanent magnet and an annular six-pole permanent magnet arranged outside the neck. Line type color cathode ray tube apparatus characterized by comprising a Nbazensu corrector magnet. 2. An in-line type electron gun having a plurality of electrodes, which is arranged in a neck of a funnel and emits a row of electron beams consisting of a center beam and a pair of side beams which pass on the same plane. A deflection yoke that is mounted on the outside and deflects an electron beam emitted from the electron gun, and is attached to a predetermined electrode of the electron gun so as to surround the center beam and shields the rear leakage magnetic field of the deflection yoke. Pattern deviation correction consisting of an annular or cylindrical magnetic body, a color purity correction magnet consisting of an annular two-pole permanent magnet arranged at the rear part of the deflection yoke, and an annular four-pole permanent magnet arranged outside the neck. A magnet and an annular 4-pole permanent magnet and an annular 6-pole permanent magnet that are arranged outside the neck adjacent to the pattern shift correction magnet. Line type color cathode ray tube apparatus characterized by comprising a Nbazensu corrector magnet.