JPH0877941A - Color cathode-ray tube device - Google Patents

Abstract

PURPOSE: To provide a color cathode-ray tube device by which the influence of earth magnetism in a neck part of a color cathode-ray tube is removed by arranging a convergence purity magnet assembly having a magnetic shield. CONSTITUTION: A convergence purity magnet assembly 10 to adjust convergence purity is installed in a neck part 4 of a color cathode-ray tube having an in-line electron gun. In this color cathode-ray tube device, a magnetic substance 19 is installed on the convergence purity magnet assembly 10 so as to cover almost the whole of an exposure surface of a retaining ring 16a arranged on the front side of the color cathode-ray tube. A magnetic substance 20 is installed so as to cover almost the whole of an inside surface of a metallic band 17 to install/fix this convergence purity magnet assembly 10 on/ to the neck part 4. Almost all of earth magnetism incident on the neck part 4 are magnetically shielded by installation of these magnetic substances 19 and 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color cathode ray tube device having a convergence purity magnet assembly attached thereto, and more particularly to a convergence purity device for eliminating the influence of geomagnetism acting on the neck portion of the color cathode ray tube. Regarding tay magnet assembly.

[0002]

2. Description of the Related Art Generally, in a color cathode ray tube having an in-line electron gun, the neck portion of a glass tube body is
A deflection yoke for appropriately deflecting the three electron beams emitted from the in-line electron gun, and a convergence purity for similarly adjusting the convergence purity for the three electron beams emitted from the in-line electron gun. With each magnet assembly attached,
It is built into various image devices.

In this case, a typical configuration of such a convergence purity magnet assembly is a pair of ring-shaped two-pole magnets and a pair of ring-shaped four-pole magnets.
A pair of 6-pole magnets and two ring-shaped retaining rings,
A ring-shaped member arranged between the one stop ring and the two-pole magnet, between the two-pole magnet and the four-pole magnet, between the four-pole magnet and the six-pole magnet, and between the six-pole magnet and the other stop ring, respectively. It consists of a spacer and a metal band with a set screw.
The pole magnet and the sextupole magnet are prevented from moving in the rotational direction by tightening the two retaining rings.
The convergence purity magnet assembly is attached and fixed in place on the color cathode ray tube by tightening the set screw of the metal band.

Further, in a color cathode ray tube having an in-line electron gun, when the face plate (image display surface) of the color cathode ray tube is oriented in the north-south direction, the electron beam passing through the color cathode ray tube intersects with the earth's magnetism. The electron beam rotates and moves according to Fleming's law. Therefore, in the known color cathode ray tube, an inner shield is provided in the funnel portion and a shadow made of a high magnetic permeability material is provided in the front panel portion in order to eliminate the intersection between the electron beam passing through the color cathode ray tube and the earth magnetism. A mask and a support frame are provided to serve as a magnetic shield against the earth's magnetism.

[0005]

In a known color cathode ray tube having an in-line electron gun, the magnetic shield provided on the front panel portion or the funnel portion of the tube body prevents the electron beam from passing through the color cathode ray tube and the geomagnetism. Although the crossing is eliminated, there is no means to magnetically shield the earth's magnetism at the neck of the tube, so when the electron beam passes through this neck, it intersects with the earth's magnetism, resulting in There is a problem that the convergence of the electron beam emitted from the side gun of the in-line electron gun is deviated when the tube surface of the cathode ray tube is used in the north-south direction.

The present invention eliminates the above-mentioned problems.
It is an object of the present invention to provide a color cathode ray tube device which is provided with a convergence purity magnet assembly with a magnetic shield and eliminates the influence of geomagnetism at the neck portion of the color cathode ray tube.

[0007]

In order to achieve the above object, the present invention installs a convergence purity magnet assembly for adjusting convergence purity on the neck portion of a color cathode ray tube having an in-line electron gun. In this color cathode ray tube device, the convergence purity magnet assembly is attached to and fixed to the neck portion, with almost the entire exposed surface of the retaining ring arranged on the front side of the color cathode ray tube. A means for attaching a magnetic material to almost the entire inner surface of the metal band is provided.

[0008]

According to the above means, almost the entire exposed surface of the retaining ring arranged on the front side of the convergence purity magnet assembly and the metal band for attaching and fixing the convergence purity magnet assembly to the neck portion of the color cathode ray tube. Since a magnetic substance is attached to almost the entire exposed surface of the, the majority of the geomagnetism that passes through the neck of the color cathode ray tube is magnetically shielded by this magnetic substance, and the electron beam and the geomagnetism at this neck. The number of crossings is significantly reduced. Therefore, the color cathode-ray tube device with such convergence convergence magnet assembly attached, even if the tube surface is used in the north-south direction,
The convergence of the electron beam emitted from the side gun of the in-line electron gun does not deviate, and the desired convergence state is maintained at all times.

[0009]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a partial cross-sectional view showing the whole of a color cathode ray tube device to which a convergence purity magnet assembly according to the present invention is attached.

In FIG. 1, 1 is a color cathode ray tube, 2 is a panel part, 3 is a funnel part, 4 is a neck part, 5 is a fluorescent film (screen), 6 is a shadow mask, 7 is an in-line electron gun, and 8 is. An inner shield (magnetic shield), 9 is a base portion, 10 is a convergence purity magnet assembly, and 11 is a deflection coil.

The glass tube constituting the color cathode ray tube includes a panel section 2 arranged on the front side, a neck section 4 accommodating the in-line type electron gun 7, and a panel section 2.
And a funnel portion 3 arranged in the middle of the neck portion 4. The panel portion 2 has a face plate on the front surface, and the fluorescent film 5 is arranged and formed on the inner surface of the face plate. A mask frame is fixedly arranged inside the peripheral portion of the panel portion 2, and the shadow mask 6 is attached so as to be arranged to face the fluorescent film 5 by this mask frame. An inner shield 8 is provided inside the connecting portion between the panel portion 2 and the funnel portion 3, and a deflection yoke 11 is provided outside the connecting portion between the funnel portion 3 and the neck portion 4. The in-line electron gun 7 is arranged inside the neck portion 4, and the convergence purity magnet assembly 10 is attached to the outside of the neck portion 4. A base portion 9 for supplying an operating voltage to the color cathode ray tube 1 is provided at the end of the neck portion 4. In this case, the 3 projected from the in-line type electron gun 7
A book electron beam (not shown) is configured to reach the fluorescent film 5 through the shadow mask 6 after being deflected in a predetermined direction by the deflection yoke 11.

The operation of the color cathode ray tube device having the above-mentioned structure, that is, the image display operation is the same as the image display operation of the known color cathode ray tube device, and since such display operation is already known, this color Description of the image display operation of the cathode ray tube device is omitted.

FIG. 2 is a perspective view showing an embodiment of the convergence purity magnet assembly 10 used in the color cathode ray tube device shown in FIG.
Figure 3 shows the same convergence purity magnet assembly 1
It is a cross-section block diagram in 0.

2 and 3, 12a and 12b are paired two-pole magnets, 13a and 13b are paired four-pole magnets, and 14a and 14b are paired six-pole magnets, and 15a and 15 are shown.
b, 15c and 15d are spacers, 16a is one stop ring, 16b is the other stop ring, 17 is a metal ring,
Reference numeral 18 is a cylindrical holding portion, 19 is a magnetic material layer attached to the exposed portion of the one stop ring 16a, 20 is a magnetic material layer attached to the inner surface of the metal ring 17, and others are shown in FIG. The same components as those shown in FIG.

The pair of two-pole magnets 12a, 12
b, the paired 4-pole magnets 13a and 13b, and the paired 6-pole magnets 14a and 14b are all ring-shaped with an opening through which the holding portion 18 is inserted, and each spacer 15a , 15b, 15c, 15d,
It has a ring shape with an opening through which the holding portion 18 is inserted. The one stop ring 16a and the other stop ring 16b have an opening provided at the center thereof screwed into a cylindrical holding portion 18, and the neck portion 4 of the color cathode ray tube 1 is inserted into the inside of the holding portion 18. It On one exposed surface of one stop ring 16a, the magnetic layer 1 is formed almost entirely.
9 is mounted, and the magnetic layer 20 is also mounted almost entirely on the inner surface of the metal ring 17.

When constructing this convergence purity magnet assembly 10, first, one stop ring screwed to the holding portion 18 is rotated, and for example, the other stop ring 16b is rotated and held. Remove from above part 18. Next, the opening of the spacer 15a is inserted into the holding portion 18 from the side where the other stop ring 16b is removed,
The spacer 15a is advanced along the holding portion 18 until it comes into contact with the one stop ring 16a. Then, spacer 1
Similarly to 5a, the openings of the paired two-pole magnets 12a and 12b are inserted into the holding portion 18, and the two-pole magnets 12a and 12b are advanced along the holding portion 18 until they come into contact with the spacer 15a. Next, the opening of the spacer 15b is inserted into the holding portion 18, and the spacer 15b is advanced along the holding portion 18 until it comes into contact with the two-pole magnets 12a and 12b. next,
The openings of the pair of quadrupole magnets 13 a and 13 b are inserted into the holding portion 18, and the quadrupole magnets 13 a and 13 b are provided along the holding portion 18.
Are advanced until they contact the spacer 15b. continue,
The opening of the spacer 15c is inserted through the holding portion 18, and the spacer 15c is inserted along the holding portion 18 into the quadrupole magnets 13a, 1
Proceed until it contacts 3b. Next, the openings of the pair of 6-pole magnets 14a and 14b are inserted into the holding portion 18, and the 6-pole magnets 14a and 14b are attached to the spacer 1 along the holding portion 18.
Proceed until it contacts 5c. Further, the spacer 15
The opening of d is inserted into the holding portion 18, and the spacer 15d is advanced along the holding portion 18 until it comes into contact with the six-pole magnets 14a and 14b. Finally, after engaging the threaded portion of the other stop ring 16b with the threaded portion of the holding portion 18, the other stop ring 16b is rotated and advanced to such an extent that it abuts the spacer 15d. Then, the metal ring 17 is fitted to the other retaining ring 16b side of the holding portion 18, and the convergence purity magnet assembly 10 is completed.

When the convergence purity magnet assembly 10 is attached to the neck portion 4 of the color cathode ray tube 1, the holding portion 18 is provided from one stop ring 16a side.
When the neck portion 4 is inserted into the inside of the, and when the convergence purity magnet assembly 10 reaches a predetermined position of the neck portion 4, by tightening the set screw of the metal ring 17,
The holding portion 18 strongly abuts on the neck portion 4, and the convergence purity magnet assembly 10 is attached to that position. Meanwhile, Convergence Purity Magnet Assembly 1
In the case of adjusting 0, the convergence purity magnet assembly 10 is attached to the neck portion 4 at a predetermined position, and then the color cathode ray tube device is operated to operate the color cathode ray tube 1.
While looking at the image displayed on the screen, the pair of dipole magnets 12
At least one of a, 12b, a pair of 4-pole magnets 13a, 13b, and a pair of 6-pole magnets 14a, 14b is appropriately rotated to perform convergence purity adjustment. And
After the convergence purity adjustment is completed, one stop ring 16a and / or the other stop ring 16b
Is screwed and rotated on the holding portion 18, and the one stop ring 16
The pair of two-pole magnets 12a and 12b, and the pair of four-pole magnets 13a are narrowed by narrowing the distance between a and the other stop ring 16b.
13b and the pair of 6-pole magnets 14a and 14b are fixed to the adjustment position.

In the convergence purity magnet assembly 10 having such a structure, one stop ring 1
The magnetic layer 19 is attached to almost the entire exposed surface of 6a (the surface not contacting the spacer 15a), and the magnetic layer 2 is provided almost entirely to the inner surface of the metal ring 17 (contact surface with the holding portion 18).
0 is installed, the convergence purity magnet assembly 10 is installed in the neck portion 4 of the color cathode ray tube 1.
When it is attached and fixed to, the majority of the geomagnetism input to the neck portion 4 is magnetically shielded by the magnetic layer 19 attached to the one stop ring 16a and the magnetic layer 20 attached to the metal ring 17. . Due to the arrangement of the magnetic shields, almost no earth magnetism is incident on the neck portion 4, so that the number of times the electron beam passing through the neck portion 4 intersects with the earth magnetism is drastically reduced, whereby the side gun of the inline electron gun emits it. The deviation of the convergence of the generated electron beam is reduced, and the desired convergence state can be maintained at all times.

In the embodiment shown in FIGS. 2 and 3, one stop ring 16a and one metal ring 17 are used.
Although the example in which the layered magnetic material layer 19 and the magnetic material layer 20 are directly attached to the above has been described, the magnetic material usable in the convergence purity magnet assembly 10 of the present invention is not limited to such a layered material. Not stop, one stop ring 16a
A donut-shaped magnetic disk having a size that covers almost the entire exposed surface of the metal ring and an annular magnetic ring having a size that covers the entire inner surface of the metal ring 17 are prepared. It is also possible to mount a donut-shaped magnetic disk on the exposed surface of the one stop ring 16a with another material interposed, and to mount this annular magnetic ring on the inner surface of the metal ring 17. .

[0021]

As described above, according to the present invention,
Magnetically covers almost the entire exposed surface of the retaining ring located on the front side of the convergence purity magnet assembly and the exposed surface of the metal band that attaches and fixes the convergence purity magnet assembly to the neck of the color cathode ray tube. Since the body is attached, most of the earth's magnetism that passes through the neck of the color cathode ray tube is magnetically shielded by this magnetic body, and the number of times the electron beam and the earth magnetism intersect at this neck is significantly reduced. Become.

As described above, in the color cathode ray tube device to which the convergence purity magnet assembly according to the present invention is attached, even if the tube surface is used in the north-south direction,
There is an effect that the convergence of the electron beam emitted from the side gun of the in-line electron gun does not shift and can always be maintained in a desired convergence state.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional configuration diagram showing an entire color cathode ray tube device to which a convergence purity magnet assembly according to the present invention is attached.

FIG. 2 is a perspective view showing an embodiment of a convergence purity magnet assembly used in the color cathode ray tube device shown in FIG.

3 is a cross-sectional configuration diagram of the convergence purity magnet assembly shown in FIG.

[Explanation of symbols]

1 Color Cathode Ray Tube 2 Panel Part 3 Funnel Part 4 Neck Part 5 Fluorescent Film (Screen) 6 Shadow Mask 7 In-line Electron Gun 8 Inner Shield (Magnetic Shield) 9 Base Part 10 Convergence Purity Magnet Assembly 11 Deflection Coils 12a, 12b Pair 2 pole magnets 13a, 13b 4 pole magnets 14a, 14b Pair 6 pole magnets 15a, 15b, 15c, 15d Spacer 16a One stop ring 16b The other stop ring 17 Metal ring 18 Cylindrical holding part 19 Magnetic layer attached to exposed part of one stop ring 16a 20 Magnetic layer attached to inner surface of metal ring 17

Claims (3)

[Claims] 1. A color cathode-ray tube apparatus comprising a color cathode ray tube having an in-line electron gun, and a neck portion of the color cathode-ray tube attached with a convergence purity magnet assembly for adjusting convergence purity. A magnetic material was attached to almost the entire exposed surface of the stop ring arranged on the front side of the color cathode ray tube and almost the entire inner surface of the metal band for attaching and fixing the convergence purity magnet assembly to the neck portion. A color cathode ray tube device characterized by the above. 2. The color cathode ray tube device according to claim 1, wherein the magnetic material is a layered material which is directly attached to the exposed surface of the retaining ring and the inner surface of the metal band. 3. The disk-shaped doughnut-shaped and annular member mounted on the exposed surface of the retaining ring and the inner surface of the metal band via another material. 1. The color cathode ray tube device according to 1.