JPH0787503A - Electron beam adjustment device for color picture tube - Google Patents

Abstract

PURPOSE:To prevent an adhesive from flowing out by providing a spacer, which has a diameter larger than those of pairs of annular magnets, between one assembly and another adjacent to it at the time of coating the outside peripheral part of one of plural magnet assemblies after adjustment with the adhesive. CONSTITUTION:With respect to magnet assemblies 7 to 9 constituting an electron beam adjustment device 5, the magnet assembly 7 for purity adjustment, a first assembly for static convergence adjustment, and a second assembly for convergence adjustment are put one over another in order from the side of fastening fittings 14 on the outermost peripheral side. When the outside peripheral part of, for example, the assembly 7 among these asemblies will be coated with an adhesive 21, diameters of spacers 10 and 11 constituting the device 5 are made larger than those of pairs of annular magnets 15 to 20 constituting the assemblies 7 to 9. However, it is unnecessary for all of spacers 10 and 11 to have larger diameters, it is sufficient if the diameter of each spacer is made larger than those of only the pair of annular rings constituting the adjacent assembly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electron beam adjusting device for a color picture tube, and more particularly, to adjust the electron beam by appropriately rotating a pair of ring-shaped magnets of a magnet assembly, and then the pair of rings. The present invention relates to an electron beam adjusting device for a color picture tube in which an adhesive is not attached to another magnet assembly when fixing the magnets with an adhesive.

[0002]

2. Description of the Related Art Generally, a color picture tube having an in-line type electron gun is provided with three electron guns.
The two electron guns have their axes on the same plane, and the electron beam paths of the two electron guns arranged outside are symmetrical with respect to the electron beam path of the electron gun arranged in the center. The electron beams emitted from the three electron guns are converged at the center of the fluorescent screen arranged in front of each electron gun, and good color purity is obtained. It is arranged so as to have such an angle.

However, the color cathode ray tube actually manufactured has a difference of 3 due to a dimensional error due to a variation of each component constituting each electron gun and an assembly placement error at the time of manufacturing and assembling.
The electron beam emitted from the electron gun of the book is not always completely converged at the center of the phosphor screen, and moreover, it is not always possible to obtain good color purity.

Therefore, in an electric device having a color picture tube incorporated therein, such as a color television set, an electron beam adjustment is performed inside the device in order to eliminate the influence of the dimensional error and the assembly error. Place the device,
It is designed to perform static convergence adjustment and color purity adjustment. Normally, the electron beam adjusting device is mounted on the neck portion of a color picture tube in which an electron gun arranged inline is housed. ing.

FIG. 3 is a main part configuration diagram showing an example of the configuration of an electron beam adjusting device for a known color picture tube, (a).
Is a state in which it is attached to the neck portion of a color picture tube, (b) is a side view thereof, (c) is a plan view of a pair of ring-shaped magnets, and (d) is a side surface of a magnet assembly composed of a pair of ring-shaped magnets. It is a figure.

In FIG. 3, reference numeral 30 is a color picture tube, and 31 is a color picture tube.
Is a neck portion, 32 is an in-line type electron gun, 33 is a fluorescent screen, 34 is a magnet assembly for adjusting the purity, 35,
36 is a first and second static convergence adjustment magnet assembly, 37 and 38 are first and second spacers, 39 is a magnet holder, 40 is a fastening metal fitting, 4
Reference numerals 1 and 42 denote a pair of ring-shaped magnets, and 43 and 44 denote knob portions.

The purity adjusting magnet assembly 34 includes a pair of ring-shaped magnets 4 which are magnetized in two poles.
It is a two-pole magnet assembly constituted by 1 and 42. The first static convergence adjustment magnet assembly 35 is a 6-pole magnet assembly including a pair of 6-pole magnetized ring-shaped magnets, and the second static convergence adjustment magnet assembly 36 is It is a four-pole magnet assembly composed of a pair of ring-shaped magnets that are magnetized in four poles. In this case, for example, the pair of ring-shaped magnets 4
1, 42 are made of a material such as barium ferrite,
The opposing portions of the ring are magnetized to the N pole and the S pole, respectively, and the pair of ring-shaped magnets having 6 poles and the pair of ring-shaped magnets having 4 poles are also
It has the same configuration as the pair of ring-shaped magnets 41, 42 only by differentiating the number of magnetizations. The magnet holder 39 is made of an insulating material such as plastic, has a substantially tubular shape, has a locking portion slightly enlarged in the outer peripheral direction at one end, and extends in the lengthwise direction at the other end. Book slits are provided.

The procedure for mounting this known electron beam adjusting device on the neck portion 31 of the color picture tube 30 is as follows. First, the second static convergence adjusting magnet assembly 36 is fitted from the other end side of the magnet holder 39 until it reaches the locking portion on the one end side, and then the second spacer 38 is fitted. continue,
The first static convergence adjusting magnet assembly 35 is fitted, then the first spacer 37 is fitted, and then the purity adjusting magnet assembly 34 is fitted, and the magnet assembly 36, the second
Spacer 38, the magnet assembly 35, the first
The spacer 37 and the magnet assembly 34 are set to overlap each other to form an electron beam adjusting device before mounting. Here, when the color picture tube 30 is prepared, the magnet holder 39 of the electron beam adjusting device before the mounting is fitted into the neck portion 31 of the color picture tube 30 from the other end side, and the magnet holder 39 is attached to the neck portion 31. When it is fitted to the predetermined position, the fastening metal fitting 40 is fitted from the neck portion 31 of the color picture tube 30 to the end portion on the one end portion side of the magnet holder 39, and then the fastening metal fitting 40 is attached to the one end portion side. Fastening is performed on several slits, and the attachment of the electron beam adjusting device to the neck portion 31 of the color picture tube 30 is completed.

An example of an electron beam adjusting procedure of a color picture tube using this known electron beam adjusting apparatus will be outlined below. First, while watching the screen of the color picture tube 30 in operation, the pair of ring-shaped magnets 41 of the magnet assembly 34 for purity adjustment,
42 is rotated by holding the knobs 44 and 45, and the purity is adjusted so that the best color purity can be obtained. Next, the pair of 6-pole magnetized ring-shaped magnets of the first static convergence adjustment magnet assembly 35 are similarly rotated while holding the knobs, and convergence adjustment is performed so that a convergence state is obtained. Then, the pair of ring-shaped magnets of the second static convergence adjusting magnet assembly 36, which are magnetized in four poles, are rotated by holding the knobs so that the convergence state is obtained as in the previous case. Adjust convergence.

Here, after the purity adjustment in the purity adjusting magnet assembly 34, each convergence adjustment in the first static convergence adjusting magnet assembly 35 and the second static convergence adjusting magnet assembly 36 are performed. ,
Again, each of the above adjustments may be repeated or terminated.

The adjustment procedure of the electron beam adjusting apparatus is as follows. First, the purity adjustment in the purity adjusting magnet assembly 34, then the convergence adjustment in the first static convergence adjusting magnet assembly 35, and finally the second adjustment. Although the example of performing the convergence adjustment in the static convergence adjustment magnet assembly 36 has been described, the order of each adjustment is not limited to the above example, and it goes without saying that any order may be performed. Is.

When the purity adjustment and the convergence adjustment in the electron beam adjusting apparatus are completed, as shown in FIG. 4, for example, an adhesive 45 is applied to the outer peripheral portion of the magnet magnet assembly 34 for adjusting the purity, When the position of the pair of ring-shaped magnets 41, 42 is fixed and an electric device including a color picture tube, for example, a color television device is moved, the purity is adjusted by vibration applied to the electron beam adjusting device. I try not to be disturbed.

[0013]

In the known electron beam adjusting apparatus, the adhesive 45 is applied to the outer peripheral portion of the magnet assembly for which adjustment has been completed, for example, the magnet assembly for purity adjustment 34, and thereafter, Even if vibration or the like is applied to the electron beam adjusting device, the purity adjustment state of the color picture tube is not disturbed. However, when the adhesive 45 is applied to the outer peripheral portion of the magnet assembly 34, the adhesive When the applied amount of the adhesive is not appropriate, especially when an excessive amount of adhesive is applied, the undried adhesive flows out from the outer peripheral portion of the magnet assembly 34, and, for example, the adjacent second spacer is used. Over 22, first
The magnet is attached to the outer peripheral portion of the static convergence adjusting magnet assembly 35 and dried there, and the pair of ring-shaped magnets having 6 poles are fixed.

By the way, in an electric device having a color picture tube incorporated therein, such as a color television set, the convergence of the color picture tube is readjusted depending on the condition of the installation location, aging, and other factors. It may create a need to do it.
However, the spilled adhesive adheres to the outer peripheral portion of the first static convergence adjusting magnet assembly 35, and in some cases also to the outer peripheral portion of the second static convergence adjusting magnet assembly 36, and dries there. If the pair of 6-pole magnetized ring-shaped magnets are fixed even to the 4-pole magnetized pair of ring-shaped magnets of the second static convergence adjusting magnet assembly 36, There is a problem that the pair of ring-shaped magnets cannot be rotated by holding the knobs, and the readjustment of the convergence of the color picture tube cannot be performed.

However, each of the magnet assemblies 35,
If the adhesive adhered to the outer peripheral portion of 36 can be easily peeled off, the above-mentioned problem can be solved, but the adhesive used for this kind of coating cannot be completely removed once it is dried and fixed. It is difficult, and there is a problem that a part thereof remains, or if it is attempted to completely remove it, it takes a considerable time to remove it and the magnet assemblies 35 and 36 are damaged.

The present invention eliminates the above-mentioned problems, and an object thereof is to prevent the adhesive from adhering to another magnet assembly when the adhesive is applied after the adjustment of the magnet assembly. An object is to provide an electron beam adjusting device for a color picture tube.

[0017]

In order to achieve the above-mentioned object, the present invention comprises a pair of ring-shaped magnets arranged on the outer periphery of a valve neck portion accommodating a plurality of in-line arranged electron guns. In an electron beam adjusting device configured by stacking magnet assemblies of at least one kind through spacers, the spacers disposed between the magnet assemblies have a diameter larger than the ring diameter of the magnet assemblies. Equipped with the means.

[0018]

According to the above-mentioned means, since the spacer having a diameter larger than the diameter of each of the pair of ring-shaped magnets is arranged between each magnet assembly composed of the pair of ring-shaped magnets, respectively. The pair of ring-shaped magnets of one magnet assembly is rotated to adjust the electron beam, and the pair of ring-shaped magnets that have been adjusted are fixed, so that they are bonded to the outer peripheral portion of the one magnet assembly. When the adhesive is applied, the adhesive is adjacent to the pair of ring-shaped magnets and is blocked by the spacer having a diameter larger than that of the pair of ring-shaped magnets, so that the adhesive should flow out to the other magnet assembly side. Disappears. For this reason, when the adhesive is applied, the adhesive flows out over a wide area and adheres to the other magnet assembly, and when the other magnet assembly is readjusted, the other magnet assembly is It is possible to avoid a situation in which the pair of three-dimensional ring-shaped magnets are fixed and the readjustment cannot be performed.

[0019]

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

FIG. 1 is a block diagram showing an embodiment of an electron beam adjusting device for a color picture tube according to the present invention.
(A) is a schematic block diagram when a color picture tube is used, and (b) is a side view of an electron beam adjusting device.

In FIG. 1, 1 is a color picture tube, 2 is a neck portion, 3 is an electron gun, 4 is a fluorescent screen, 5 is an electron beam adjusting device, 6 is a deflection yoke, 7 is a magnet assembly for purity adjustment, and 8 is a magnet assembly. Is a first static convergence adjustment magnet assembly, 9 is a second static convergence adjustment magnet assembly, 10 is a first spacer, 11 is a second spacer, 13 is a magnet holder, 14 is a fastening metal fitting, Reference numerals 15 and 16 are a pair of ring-shaped magnets that are magnetized in two poles, 17 and 18 are a pair of ring-shaped magnets that are magnetized in six poles, 19 and 20 are a pair of ring-shaped magnets that are magnetized in four poles, and 21 is a pair. It is an adhesive.

In the color picture tube 1, a deflection yoke is mounted on the funnel portion side of the outer periphery of the neck portion 2, and an electron beam adjusting device 5 is mounted on the outer periphery of the portion where the electron gun 3 is arranged. The electron beam adjusting device 5 includes a second magnet assembly 9 for static convergence adjustment, a second spacer 11, a first magnet assembly 8 for static convergence adjustment, and a first magnet assembly 8 around a cylindrical magnet holder 13. The spacer 10 and the purity adjusting magnet assembly 7 are sequentially fitted and are configured to overlap with each other, and when the electron beam adjusting device 5 is attached to the neck portion 2 of the color picture tube 1, the magnet holder 13 is attached. The mounting is performed by fastening the fastening metal fitting 14 on the top. In this case, the purity adjusting magnet assembly 7 is composed of a pair of ring-shaped magnets 15 and 16 that are magnetized in two poles, and the first static convergence adjusting magnet assembly 8 is magnetized in six poles. The second static convergence adjusting magnet assembly 9 is composed of a pair of ring-shaped magnets 17 and 18, and the like, and is composed of a pair of ring-shaped magnets 19 and 20 which are magnetized in four poles. Also,
The first spacer 10 and the second spacer 11 are larger than the diameters of the pair of ring-shaped magnets 15 to 20 constituting the magnet assemblies 7 to 9, respectively, and are larger than those of the pair of ring-shaped magnets 15 to 20. It has a diameter that does not reach the tip of the knob. In addition,
The height at which the peripheral portions of the first spacer 10 and the second spacer 11 are made to protrude more than the peripheral portions of the pair of ring-shaped magnets 15 to 20 is preferably at least 1 mm, and moreover, the height of each pair of It is desirable that the length of the knobs of the ring-shaped magnets 15 to 20 does not exceed 5 mm.

In the above structure, the procedure for mounting the electron beam adjusting apparatus 5 of this embodiment on the neck portion 2 of the color picture tube 1 and the electron beam adjusting apparatus 5 of this embodiment using the electron beam adjusting apparatus 5 of this embodiment Since the procedure for adjusting the beam is the same as the above-described procedure for the known electron beam adjusting apparatus, the description thereof will be omitted.

In the electron beam adjusting apparatus 5 according to the present embodiment, the outermost magnet assembly (on the side of the fastening metal fitting 14) of the magnet assemblies 7 to 9 that have been adjusted, for example, a magnet assembly for purity adjustment. When the adhesive 21 is applied to the outer peripheral portion of the three-dimensional body 7, the pair of ring-shaped magnets 15, 16 are provided between the purity adjusting magnet assembly 7 and the first static convergence adjusting magnet assembly 8. Since the first spacers 10 having a diameter larger than the diameters of 17 and 18 are attached, the amount of the adhesive 21 applied is not an appropriate amount, and in particular, an excessive amount of the adhesive 21 is applied. Even at this time, the excess adhesive 21 is removed from the outer peripheral portion of the purity adjusting magnet assembly 7 by the wall of the first spacer 10 having the large diameter. It flows out to is eliminated.

For this reason, the undried adhesive 21 flows out, for example, the first spacer 22 adjacent to the first adhesive 22 via the first spacer 22.
Attached to the outer periphery of the static convergence adjusting magnet assembly 8 and dried there to fix the pair of 6-pole-magnetized ring-shaped magnets 17 and 18 of the magnet assembly 8 and to fix the subsequent convergence. It is possible to avoid the situation that readjustment cannot be performed.

In this case, in this embodiment, the magnet assemblies 7 to 9 constituting the electron beam adjusting apparatus 5 are the magnet assemblies 7 for adjusting the purity and the first static magnets from the outermost side (tightening fitting 14 side). The example is shown in which the convergence adjusting magnet assembly 8 and the second static convergence adjusting magnet assembly 9 are stacked in this order, but the order of stacking is limited to the above example. Instead, for example, the first static convergence adjustment magnet assembly 8, the second static convergence adjustment magnet assembly 9, and the purity adjustment magnet assembly 7 may be superposed in this order from the outermost side. You may superimpose them in order.

The electron beam adjusting device 5 is also used in this embodiment.
Among the magnet assemblies 7 to 9 constituting the above, an example is shown in which the adhesive 21 is applied to the outer peripheral portion of the purity adjusting magnet assembly 7 on the outermost side (tightening fitting 14 side). The magnet assembly to which the adhesive 21 is applied is not limited to the outermost one.
For example, the second innermost side (the side opposite to the fastening fitting 14)
The adhesive 21 may be applied to the outer peripheral portion of the static convergence adjusting magnet assembly 9 of FIG. 1, or the adhesive 21 may be applied to the outer peripheral portion of the intermediate first static convergence adjusting magnet assembly 8. You may do it.

Further, in this embodiment, the diameters of the spacers 10 and 11 constituting the electron beam adjusting device 5 are larger than the diameters of the pair of ring-shaped magnets to 20 constituting the magnet assemblies 7 to 9, respectively. However, it is not necessary to increase the diameter of both spacers 10 and 11 as described above.
The diameter of the spacer adjacent to the magnet assembly to which the adhesive 21 is applied, for example, if it is the purity adjusting magnet assembly 7, the first spacer adjacent to this purity adjusting magnet assembly 7 Only the diameter of 10 is increased as described above, and the diameters of the other second spacers 11 are smaller than the diameters of the pair of ring-shaped magnets or 20 as in the known spacers of this type. It may be configured as follows.

In this embodiment, the electron beam adjusting device 5 is also used.
Examples of three types of magnet assemblies 7 to 9 constituting the above are a purity adjusting magnet assembly 7, a first static convergence adjusting magnet assembly 8, and a second static convergence adjusting magnet assembly 9. As shown, the electron beam adjusting device 5
The number (type) of each magnet assembly incorporated in is 3
The magnet assembly is not limited to one kind, and may be two kinds of magnet assembly for purity adjustment and magnet assembly for static convergence adjustment, and four kinds of magnet assemblies for second purity adjustment are provided. Alternatively, four kinds of magnets may be used which are provided with a third static convergence adjusting magnet assembly.

Next, FIG. 2 is a constitutional view showing another embodiment of the electron beam adjusting device for a color picture tube according to the present invention, in which (a) is a side view of the electron beam adjusting device and (b) is shown.
FIG. 6 is a plan view showing a structure of a spacer.

In FIG. 2, 22 is a third spacer, 2
3 is a large diameter part, 24 is a fourth spacer, and others,
The same components as those shown in FIG. 1 are designated by the same reference numerals.

The third spacer 22 is composed of a large-diameter portion 23 of which a part of the peripheral portion is larger than the diameter of each pair of ring-shaped magnets to 20 constituting each magnet assembly 7 to 9. The remaining part of the portion is configured to have a diameter smaller than the diameter of each pair of ring-shaped magnets to 20 constituting each magnet assembly 7 to 9. The fourth spacer 24 is configured such that the entire circumference of the fourth spacer 24 has a diameter smaller than the diameters of the pair of ring-shaped magnets to 20 constituting the magnet assemblies 7 to 9.

Also in this embodiment, the procedure of mounting the electron beam adjusting device 5 on the neck portion 2 of the color picture tube 1 and the electron beam of the color picture tube 1 by using the electron beam adjusting device 5 of this embodiment. The adjustment procedure is as described in the above embodiment
That is, since the procedure is the same as that of the known electron beam adjusting apparatus described above, description thereof will be omitted.

The electron beam adjusting apparatus 5 according to the present embodiment also has a magnet assembly on the outermost side (tightening fitting 14 side) of the magnet assemblies 7 to 9 that have been adjusted, for example, a magnet for adjusting the purity. When the adhesive 21 is applied to the outer peripheral portion of the assembly 7, a third spacer having a large diameter portion 23 is provided between the purity adjusting magnet assembly 7 and the first static convergence adjusting magnet assembly 8. Since the adhesive 22 is attached, if the coated portion of the adhesive 21 is selected to be a portion corresponding to the location where the large-diameter portion 23 exists, even if an excessive amount of the adhesive 21 is coated, the excess adhesive 21 is not applied. The adhesive 21 is the third spacer 2
The large-diameter portion 23 of 2 serves as a wall and does not flow out from the outer peripheral portion of the magnet assembly 7 for adjusting purity to another portion.

As described above, according to the present embodiment, the undried adhesive 21 flows out, and, for example, is applied to the outer peripheral portion of the first static convergence adjusting magnet assembly 8 which is adjacent via the first spacer 22. By attaching and drying there, the pair of ring-shaped magnets 17 and 18 of the magnet assembly 8 which are magnetized with 6 poles are fixed, and it is impossible to readjust the convergence thereafter. Can be avoided.

In this embodiment also, each magnet assembly 7
9 to 9, the magnet assembly to which the adhesive 21 is applied, the number (type) of each magnet assembly to be incorporated, etc. are not limited to the above examples, and can be appropriately selected. Of course.

[0037]

As described above, according to the present invention, when the adhesive 21 is applied to the outer peripheral portion of one of the magnet assemblies 7 to 9 that have been adjusted, Between the one magnet assembly 7 and another magnet assembly 8 adjacent thereto, a pair of ring-shaped magnets 15 constituting each magnet assembly 7 to 9.
Since the spacers 10, 11 and 22 each having a portion having a diameter larger than the diameter of 20 to 20 are arranged, even if the excessive adhesive 21 is applied, the excessive adhesive 2
In the case of 1, the spacers 10, 11 and 22 having a large diameter serve as walls, so that they do not flow out to the other from the outer peripheral portion of the one magnet assembly 7.

Therefore, when the adhesive 21 is applied, the undried adhesive 21 flows out, adheres to the outer peripheral portion of the adjacent magnet assembly 8 and is dried there to dry the other magnet. There is an effect that it is possible to avoid a situation in which the pair of ring-shaped magnets 17 and 18 that form the assembly 8 are fixed and the subsequent readjustment of the electron beam cannot be performed.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of an electron beam adjusting device for a color picture tube according to the present invention.

FIG. 2 is a configuration diagram showing another embodiment of the electron beam adjusting device for a color picture tube according to the present invention.

FIG. 3 is a main part configuration diagram showing an example of a configuration of an electron beam adjustment device of a known color picture tube.

FIG. 4 is a configuration diagram showing an example of a state after electron beam adjustment in an electron beam adjustment device of a known color picture tube.

[Explanation of symbols]

1 Color Picture Tube 2 Neck Part 3 Electron Gun 4 Fluorescent Screen 5 Electron Beam Adjusting Device 6 Deflection Yoke 7 Magnet Assembly for Purity Adjustment 8 First Magnet Assembly for Adjusting Static Convergence 9 Second Magnet Assembly for Adjusting Static Convergence 10 1st spacer 11 2nd spacer 13 Magnet holder 14 Tightening metal fittings 15 and 16 Two-pole magnetized pair of ring-shaped magnets 17 and 18 6-pole magnetized paired ring-shaped magnets 19 and 20 4 poles A pair of magnetized ring-shaped magnets 21 Adhesive 22 Third spacer 23 Large-diameter portion 24 Fourth spacer

Claims (3)

[Claims] 1. A structure in which two or more kinds of magnet assemblies, each of which is a pair of ring-shaped magnets, are superposed on each other by being mounted on the outer periphery of a neck portion accommodating a plurality of in-line arranged electron guns. In the electron beam adjusting device for a color picture tube, the spacer is at least 1
An electron beam adjusting device for a color picture tube, wherein each of the magnets has a diameter larger than a ring diameter of a pair of ring-shaped magnets constituting each magnet assembly. 2. The portion of the spacer having a diameter larger than the ring diameter of the pair of ring-shaped magnets forming each of the magnet assemblies is a part of a peripheral edge portion of the ring. Electron beam adjusting device for color picture tube. 3. The diameter of the spacers, which is larger than the ring diameter of the pair of ring-shaped magnets forming each magnet assembly, does not reach the tips of the knob portions of the pair of ring-shaped magnets. An electron beam adjusting device for a color picture tube according to any one of claims 1 and 2.