JPH1083769A - Cathode-ray tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make convergence of electron beam properly by enhancing the reliance upon the coupling strength of a glass cylinder with an electrode such as the third grid, and supplying stably the desired potential to a resistance layer which forms an electrostatic lens. SOLUTION: A cathode-ray tube concerned includes an electron gun of such a structure that an electron beam forming part 25, convergence structure part 16, and a supporting part for performing axial alignment of electron beam are installed in the neck part 13 of a bulb 10 in such a way as coupled one by one in the beam emitting direction, one end of an insulative hollow cylinder 14 is coupled with the electrode of the beam forming part 25, the other end of the cylinder 14, and at least one side of the supporting part through cylinder holders 12 and 17, and the coefficient of thermal expansion of the cylinder holders 12 and 17 is set to a value greater than that of the cylinder 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cathode ray tube used for a television receiver or the like, and more particularly, to a structure of an electron gun constituting the cathode ray tube.

[0002]

2. Description of the Related Art In recent years, as a large screen and high resolution television receiver, a projection type television receiver using a cathode ray tube has been actively developed. As a method of converging an electron beam emitted from the electron gun in an electron gun used in the cathode ray tube, a method using an electrostatic lens is known.

In order to realize a high-resolution television receiver, an electrostatic lens having a small spherical aberration is required.
Generally, the spherical aberration can be reduced by increasing the lens diameter. However, in the case of an electrostatic lens, the maximum lens diameter is limited by the inner diameter of the neck portion of the cathode ray tube. Therefore, the magnitude of the spherical aberration in the electrostatic lens is usually determined by the size of the cathode ray tube (the size of the inner diameter of the neck portion). Changes need to be made.

As a technique for obtaining an electrostatic lens capable of reducing spherical aberration without being limited by the inner diameter of the neck portion of a cathode ray tube, for example, US Pat. No. 3,143,681.
(Specification) or Japanese Patent Application Laid-Open No. 1-225044. This Japanese Patent Application Laid-Open No. 1-22504
Japanese Patent Application Laid-Open No. 4 (1999) -175 discloses a cathode ray tube having a spiral electric resistance structure as an electrostatic lens forming part.

Hereinafter, a conventional cathode ray tube will be described with reference to FIG. FIG. 8 is a sectional view of a basic structure of a cathode ray tube according to the related art. The cathode ray tube is provided with an electron gun having a focusing structure section 16 and an electron beam forming section 25 inside the neck section 13. The focusing structure 16 is configured by using the resistance layer 5 spirally provided on the inner wall of the glass cylinder 14. The electron beam forming unit 25 is configured by fixing the first grid 19, the second grid 20, and the third grid 18 to the multiform rod 3 via a metal bracket.

[0006] One end face of the glass cylinder 14 constituting the focusing structure 16 is fixedly connected by welding to a third grid 18 constituting an electron beam forming unit 25 via a flat metal ring 24a. And the glass cylinder 1
The resistance layer 5 provided on the inner wall of the fourth grid 4 is electrically connected to the third grid 18. A flat metal ring 24b is also welded to the other end surface of the glass cylinder 14, and the metal ring 24b is provided with four springs 8. These springs 8 have functions of aligning the electron gun in the neck portion 13 and electrically connecting the electron gun to the inner surface duck 22.

[0007]

However, in the electron gun constituting the cathode ray tube according to the above-mentioned prior art, a welding step for welding the metal rings 24a and 24b to the glass cylinder 14, or a process for forming the metal ring 24a is not required. At the time of the welding process when welding to the third grid 18 or the like, minute cracks may occur in the glass cylinder 14 due to thermal energy. If such a crack exists, the crack is elongated by a slight impact or a stress received while the electron gun is inserted into the neck portion, and the connection between the glass cylinder 14 and the metal rings 24a and 24b is disconnected. In this case, a desired potential cannot be supplied to the resistance layer 5 forming the electrostatic lens, and the electron beam cannot be appropriately focused.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and in particular, a resistance layer for forming an electrostatic lens by increasing the reliability of the connection strength between the glass cylinder 14 and the third grid 18 and the like. It is intended to stably supply a desired potential to the electron beam and to appropriately focus the electron beam.

[0009]

According to the present invention, there is provided a bulb having a phosphor screen formed on one inner surface and a neck formed on the other side, and a cathode and an electrode provided in the neck. An electron beam forming section having an insulating hollow cylinder having a resistive layer formed on an inner surface thereof, and a support section for aligning an electron beam in an electron beam emitting direction. In a cathode ray tube including a gun, an end of the insulating hollow cylinder on the electron beam forming unit side and an electrode of the electron beam forming unit,
And connecting at least one of the fluorescent screen end portion and the support portion of the insulating hollow cylinder via a cylinder holding member having a hole coaxially with the insulating hollow cylinder, and a thermal expansion coefficient of the cylinder holding member. Is set to be larger than the coefficient of thermal expansion of the insulating hollow cylinder.

With this configuration, when the insulating hollow cylinder is made of glass or the like, the insulating hollow cylinder can be effectively prevented from cracking. It is possible to improve the connection strength between the hollow cylinder and the electrode (grid). In the above configuration, when the temperature decreases in the welding step, the contraction of the cylinder holder is larger than the contraction of the insulating hollow cylinder, so that a compressive stress is applied to the insulating hollow cylinder. This is because glass has a greater compressive strength than a tensile strength, so that the insulating hollow cylinder does not easily crack. Therefore,
Even if it is other than glass, the same effect can be obtained by forming the insulating hollow cylinder using a material having a compressive strength greater than a tensile strength. Here, a member having elastic force, such as a spring, or a member capable of appropriately aligning the electron beam can be used as a support for aligning the electron beam.

Further, the inner diameter of the hole of the cylinder holding body is
The insulating hollow cylinder is preferably formed to have a larger outer diameter than the insulating hollow cylinder, and the insulating hollow cylinder is preferably inserted into a part of the cylinder holder. A collar is formed at one end of the cylinder holder, It is preferable that the end face of the hollow cylinder and the collar of the cylinder holder are connected.

Further, it is preferable that the cylinder holder and the insulating hollow cylinder are connected via a frit, and that the cylinder holder has an oxide film. As described above, as means other than welding the insulating hollow cylinder and the cylinder holder through a frit (or low melting point glass or the like), the cylinder holder is welded by melting the insulating hollow cylinder. It is also preferable to make it.

According to this structure, the welding surface of the cylinder holder becomes porous, so that the coupling strength between the insulating hollow cylinder and the cylinder holder can be improved by the anchor effect, and oxidation can be achieved. A diffusion layer of the coating is formed in the insulating hollow cylinder (glass cylinder) or the frit, so that the coupling strength between the insulating hollow cylinder (glass cylinder) and the cylinder holder can be improved by chemical bonding.

In the case where cylinder holders are provided on both the fluorescent screen side and the neck side of the focusing structure, the cylinder holders do not need to have the same shape, and the structures of the electron gun and the cathode ray tube are not necessary. May be appropriately determined in accordance with.

Further, it is preferable that the thickness of the cylinder holder is set to a certain value or more so that the temperatures of the insulating hollow cylinder and the frit do not reach the annealing point.
With such a configuration, local thermal stress does not occur in the insulating hollow cylinder and the frit, so that cracks and the like can be prevented.

Further, it is preferable that the resistance layer is formed in a spiral shape on the inner wall of the insulating hollow cylinder.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an electron gun constituting a cathode ray tube according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a cathode ray tube having an electron gun according to a first embodiment of the present invention. In this embodiment, the electron gun comprises a neck 1 of the bulb 10.
3 and is configured using an electron beam forming unit 25, a focusing structure unit 16, and the like.

The electron beam forming unit 25 includes a first grid 1
9, an electrode made of a metal such as the second grid 20 and the third grid 18, the cathode 2 provided near the stem of the neck portion 13, the heater 1, and the like. Specifically, cup members constituting the first grid 19, the second grid 20, and the third grid 18 are coaxially arranged adjacent to the cathode 2, and each of the grids 18, 19, 20 forms a bracket. It is fixed to the multi-form rod 3 through the. In this case, two multiform rods are used.

The convergence structure 16 includes the insulating hollow cylinder 1.
4 is a glass cylinder, and this glass cylinder 1
4 is formed by using a resistance layer 5 spirally provided on the inner wall of the element 4. At one end (hereinafter, referred to as “first end”) of the glass cylinder 14 on the electron beam forming unit 25 side, a cylinder holder 17 is provided via a frit. The glass cylinder 14 is fixedly connected to the third grid 18 through the intermediary of the glass cylinder 14. Also,
The other end of the glass cylinder 14 (hereinafter, “second end”
Is provided with a cylinder holder 12 via a frit, and a glass cylinder 14 is fixedly connected to the fifth grid 7 via the cylinder holder 12. FIGS. 2 and 3 show enlarged views of a connection portion between the first end and the second end. The supporting portion is provided with a spring 8 on the fifth grid 7, and this spring 8
The axis of the electron beam emitted from the electron gun in the neck portion 13 is aligned. Also, through the spring 8 and the cylinder holder 12, a connection is made between the resistance layer 5 formed inside the glass cylinder 14 and the inner surface duck 22, which is a conductive material forming an electrical contact with a high-voltage contact. Is also performed.

Glass cylinder 14 and cylinder holder 1
As a method of connecting the second and the second 17 to each other, for example, as shown in FIGS. 2 and 3, there is a method of welding through a frit 23. In this case, it is preferable that the transition point of the frit 23 is lower than the transition point of the glass cylinder 14. It is preferable to select the frit 23 so as to be as such. Frit 23
For example, a paste obtained by adding a solvent (vehicle) to a glass powder containing SiO ₂ as a main component and sufficiently kneading the mixture into a glass powder is used. The desired amount of application at this time can be easily adjusted by using a dispenser. If this technique is used, the glass cylinder 14 can be prevented from being significantly softened and deformed. By preventing the softening and deformation of the glass cylinder 14 in this way, it is possible to obtain the focusing structure 16 without displacement.

Next, the joining portion between the cylinder holders 12, 17 and the glass cylinder 14 will be described in more detail. Cylinder holders 12, 17 and glass cylinder 14
If there is a difference in the coefficient of thermal expansion between the frit 23 and the frit 23, stress is generated in the welded portions 4 and 6. In particular, at a temperature lower than the vicinity of the annealing point of the glass and the frit, when the difference between the thermal expansion coefficients is large, the stress is increased, and the glass and the frit are broken (cracked) and the welding interface is peeled off. Further, the glass cylinder 14 or the frit 23
However, when the thermal expansion coefficient is larger than that of the cylinder holders 12 and 17, the glass or the frit is subjected to tension when the temperature is lowered in the welding step or the like, so that the glass or the frit is likely to be broken (cracked).

Therefore, it is theoretically preferable that the thermal expansion coefficients of the cylinder holders 12 and 17, the glass cylinder 14 and the frit 23 be exactly the same over the entire range from the temperature near the annealing point to room temperature. However, in reality, the materials of the cylinder holders 12 and 17, the glass cylinder 14, and the frit 23 vary, and it is necessary to accurately match the thermal expansions due to the processing distortion of the cylinder holders 12 and 17. It is difficult.

Therefore, in the present embodiment, the cylinder holders 12 and 17 are formed using a material having a larger thermal expansion coefficient than the glass cylinder 14 and the frit 23, and the glass cylinders 14 and 17 are formed by the cylinder holders 12 and 17. The outer surface with the frit 23 is surrounded. With this configuration, even when compressive stress is applied to the glass cylinder 14 and the frit 23 due to the contraction of the cylinder holders 12 and 17 at the time of temperature decrease, the glass cylinder 14 and the frit 23 are easily applied to the glass cylinder 14 and the frit 23. No cracks occur. This is because the glass cylinder 14 and the frit 23 (so-called glass) have a property that the compressive strength is much larger when the compressive strength is compared with the tensile strength. Therefore, according to the present embodiment, the glass cylinder 14 and the cylinder holders 12, 1
7 can be kept strong.

At this time, as a suitable combination of the materials constituting the glass cylinder 14, the cylinder holders 12, 17 and the frit 23, for example, the glass cylinder 14
Using borosilicate glass as a material for forming
An iron-nickel alloy or an iron-nickel-cobalt alloy is used as a material for forming the cylinder holders 12 and 17, and Nit manufactured by NEC Corporation is used as the frit 23.
E-1402, SM-700-4, 7C2, 4C3, etc. may be used. Further, as another combination, lead glass or alkali glass is used as a material for forming the glass cylinder 14, and the cylinder holder 1
It is conceivable that an iron-nickel alloy is used as a material for forming 2, 17 and PLS-7105 manufactured by NEC Corporation or the like is used as the frit 23.

In this embodiment, as shown in FIGS. 2 and 3, a metal oxide 26 is provided at the weld interface between the cylinder holders 12 and 17. With such a configuration, the surfaces of the cylinder holders 12 and 17 become porous, so that the glass cylinder 14 and the cylinder holders 12 and 17 can be more strongly coupled by the anchor effect. Furthermore, a diffusion layer of the oxide is formed in the glass, which can strongly bind both the metal and the glass. However, if the oxide film layer is too thick, the bonding strength with the metal interface will be low.
Preferably, the oxidation treatment is performed for 20 minutes to 20 minutes.

Next, a method of connecting the cylinder holder 17 on the first end side of the glass cylinder 14 to the third grid and a method of connecting the cylinder holder 12 on the second end side and the fifth grid will be described. This will be described with reference to FIGS.

As shown in FIG. 2, the cylinder holder 17 connected to the glass cylinder 14 is inserted into the cylinder of the third grid 18 and connected to the third grid 18 by welding. As shown in FIG. 3, the cylinder holder 12 connected to the glass cylinder 14 is connected to the fifth grid 7 by welding.

When performing these weldings, the position and size of the welding spot 21 should be considered so as to minimize the influence on the components of the electron gun, and a suitable welding method or the like must be selected. No. One example is a laser welding method. Usually, at the welding spot 21, the metal is melted at a high temperature exceeding 1000 ° C., and in the vicinity thereof, the temperature rises due to heat diffusion from the welding spot 21, so that local thermal stress is generated. In order to cope with this, the distance between the welding spot 21 and the welded portions 4 and 6 is increased, or the cylinder holder 1
It is conceivable to increase the thickness of the plates 2 and 17. By doing so, the temperature of the glass cylinder 14 and the frit 23 at the welded portions 4 and 6 can be prevented from reaching the annealing point, so that the occurrence of local thermal stress can be prevented, and the glass cylinder 14 and the frit can be prevented. 23 can be prevented from cracking. For example, it is preferable that the distance between the welded portions 4 and 6 and the welding spot 21 is 1 mm or more. The plate thickness of the cylinder holders 12, 17 is preferably 1 mm or more, for example, about 1 to 2 mm. Since the cylinder holders 12 and 17 are cylindrical as shown in FIGS. 2 and 3, the welding spot 21 and the welding portions 4 and
6 can be easily separated. Therefore, as shown in FIG. 2 and FIG.
By forming 7, it is possible to easily suppress deterioration of the welding strength due to thermal energy generated during welding.

Next, another embodiment of the connecting portion structure of the first end of the glass cylinder 14 will be described with reference to FIGS. FIG. 4A shows that the inner diameter of the cylinder holder 17 made of a high expansion material having a thickness of 1 mm or more is formed larger than the outer diameter of the glass cylinder 14 so that the cylinder holder 17 covers the first end of the glass cylinder 14. It is configured. A frit 23 is filled and welded between the inner surface of the cylinder holder 17 and the outer surface of the glass cylinder 14 (including the end surface of the glass cylinder 14), and the cylinder holder 17 and the third grid 18 are connected by welding.

The feature of this embodiment is that the third grid 18
The point is that the connection can be performed by welding in a state where the shaft alignment is adjusted at the engagement surface between the cylinder and the cylinder holder 17. FIG. 4B shows that the inner diameter of the cylinder holder 17 made of a high expansion material having a thickness of 1 mm or more is formed larger than the outer diameter of the glass cylinder 14 so that the cylinder holder 17 covers the first end of the glass cylinder 14. It is configured. A frit 23 is provided between the outer surface of the glass cylinder 14 (excluding the end surface of the glass cylinder 14) and the inner surface of the cylinder holder 17.
And the cylinder holder 17 and the third grid 18 are connected by welding.

The feature of this embodiment is that the third grid 18
The frit 23 protrudes into the glass cylinder 14 because the end face of the glass cylinder 14 is not filled with the frit 23 because it can be connected by welding in a state where the axial alignment is adjusted on the engagement surface of the cylinder holder 17 and the cylinder holder 17. It is difficult point.

FIG. 4C shows that the inner diameter of the cylinder holder 17 made of a high expansion material is formed to be larger than the outer diameter of the glass cylinder 14.
4 is arranged so as to cover the first end, the inner diameter of the third grid 18 is formed larger than the outer diameter of the cylinder holder 17,
The structure is such that the cylinder holder 17 is inserted into the cylinder of the third grid 18. A frit 23 is filled and welded between the outer surface of the glass cylinder 14 and the inner surface of the cylinder holder 17, and the cylinder holder 17 and the third grid 18 are connected by welding at a welding spot 21.

The feature of this embodiment is that the cylinder holder 1
By making the cylinder 7 cylindrical, the distance between the welding spot 21 and the welded portion 4 can be easily separated, so that the deterioration of the welding strength due to the heat energy generated during welding can be suppressed. Therefore, as the cylinder holding member 17, for example, a thin member having a thickness of 0.15 to 0.30 mm can be used. Since the cylinder holding member 17 has a simple cylindrical shape, the cost can be reduced. In addition, glass cylinder 1
4 The frit 23 is hard to protrude into the inner surface,
Is easy to fill.

FIG. 4D shows a case where a flange is formed on the cylinder holder 17 and the flange and the glass cylinder 14 are welded to each other.
A configuration in which the inner diameter of the grid 18 is formed larger than the outer diameter of the cylinder holder 17 to form a flange on the third grid 18, and the cylinder holder 17 is inserted into the cylinder of the third grid 18. It is. Glass cylinder 1
The cylinder holder 4 and the cylinder holder 17 are formed using materials having the same thermal expansion coefficient as each other. When the cylinder holder 17 is heated, an oxide film layer 26 is formed on the surface thereof. The end face and the flange of the cylinder holder 17 are directly welded. Cylinder holder 17
And the third grid 18 are connected by welding at a welding spot 21 portion.

The feature of this embodiment is that the glass cylinder 1
4 and the cylinder holder 17 can be welded only by raising the temperature in a limited range near the end face of the glass cylinder 14,
The point is that the alignment of the electron beam can be relatively easily performed. Also, by bringing the collar formed on the third grid 18 and the collar formed on the cylinder holder 17 into contact with each other,
The position in the pipe axis direction can be easily set. Further, by making the cylinder holder 17 cylindrical, the welding spot 2
1 and the welding portion 4 can be easily separated from each other,
It is possible to suppress the deterioration of the welding strength due to the heat energy generated during welding. Therefore, as the cylinder holding member 17, for example, a thin member having a thickness of 0.15 to 0.30 mm can be used. Since the cylinder holding member 17 has a simple cylindrical shape, the cost can be reduced.

FIG. 5E shows a case where a collar is formed on the cylinder holder 17 and the flange is brought into direct contact with the glass cylinder 14 so that the inner diameter of the third grid 18 is formed larger than the outer diameter of the cylinder holder 17. A brim is formed on the third grid 18 so that the cylinder holder 17 is inserted into the cylinder of the third grid 18. The outer surface of the first end of the glass cylinder 14 and the flange of the cylinder holder 17 are welded using a frit, and the cylinder holder 17 is welded.
And the third grid 18 are connected by welding at a welding spot 21 portion.

The feature of this embodiment is that the cylinder holder 1
By making the cylindrical shape of 7, the distance between the welding spot 21 and the welded portion 4 can be easily separated, so that the deterioration of the welding strength due to thermal energy generated at the time of welding can be suppressed. Therefore, as the cylinder holding member 17, for example, a thin member having a thickness of 0.15 to 0.30 mm can be used. Since the cylinder holding member 17 has a simple cylindrical shape, the cost can be reduced. Also, the third grid 1
By contacting the collar formed on the cylinder 8 with the collar formed on the cylinder holder 17, the position in the pipe axis direction can be easily set.

FIG. 5F shows a state in which the end face of the glass cylinder 14 and the end face of the cylinder holder 17 are welded to each other, and the third grid 18 is welded.
Is formed to be larger than the outer diameter of the cylinder holder 17, and the cylinder holder 17 is inserted into the cylinder of the third grid 18. Glass cylinder 1
The cylinder holder 4 and the cylinder holder 17 are formed using materials having the same thermal expansion coefficient as each other. When the cylinder holder 17 is heated, an oxide film layer 26 is formed on the surface thereof. And the end face of the cylinder holder 17 are directly welded. Cylinder holder 1
7 and the third grid 18 are connected by welding at a welding spot 21 portion.

The feature of this embodiment is that the glass cylinder 1
4 and the cylinder holder 17 can be welded only by raising the temperature in a limited range near the end face of the glass cylinder 14,
Axis alignment is relatively easy. Further, by making the cylinder holder 17 cylindrical, the welding spot 2
1 and the welding portion 4 can be easily separated from each other,
It is possible to suppress the deterioration of the welding strength due to the heat energy generated during welding. Therefore, as the cylinder holding member 17, for example, a thin member having a thickness of 0.15 to 0.30 mm can be used. Since the cylinder holding member 17 has a simple cylindrical shape, the cost can be reduced.

FIG. 5G shows that the end face of the glass cylinder 14 is welded to one end face on the glass cylinder 14 side of the cylinder holder 17 formed of a material having a thickness of 1 mm or more, and the other end face of the cylinder holder 17 is welded. The flange of the third grid 18 is connected by welding at a welding spot 21 portion.
The glass cylinder 14 and the cylinder holder 17 are formed using materials having the same coefficient of thermal expansion as each other.
6 is formed and the heated glass cylinder 14 end face and the end face of the cylinder holder 17 are directly welded.

The feature of this embodiment is that the glass cylinder 1
Since the welding can be performed only by increasing the temperature in a limited range between the cylinder holder 4 and the cylinder holder 17, the alignment can be relatively easily performed. Further, since the end face of the cylinder holder 17 and the flange of the third grid 18 are welded to each other, the position of the tube axis method can be easily set. Further, the third grid 18 and the cylinder holder 17 can be connected by welding in a state where the axial alignment is adjusted on the engagement surface.

FIG. 5H shows that the end face of the glass cylinder 14 is brought into direct contact with one end face on the glass cylinder 14 side of the cylinder holder 17 formed of a material having a thickness of 1 mm or more.
The other end surface of the cylinder holder 17 and the flange of the third grid 18 are connected by welding at a welding spot 21. The outer surface of the first end portion of the glass cylinder 14 and one end surface of the cylinder holder 17 are welded using a frit 23.

The feature of this embodiment is that the cylinder holder 1
Since the other end face 7 and the flange of the third grid 18 are welded together, the position of the tube axis method can be easily set. Further, the third grid 18 and the cylinder holder 17 can be connected by welding in a state where the axial alignment is adjusted on the engagement surface.

Next, another embodiment of the structure of the connecting portion at the second end of the glass cylinder 14 will be described with reference to FIGS. FIG. 6A shows that the inner diameter of the cylinder holder 12 made of a high expansion material having a thickness of 1 mm or more is formed larger than the outer diameter of the glass cylinder 14 so that the cylinder holder 12 covers the second end of the glass cylinder 14. It is configured. A frit 23 is filled and welded between the inner surface of the cylinder holder 12 and the outer surface of the glass cylinder 14 (including the end surface of the glass cylinder 14), and the cylinder holder 12 and the fifth grid 7 are welded at the welding spot 21. Linked by

The feature of this embodiment is that the connection can be performed by welding in a state where the alignment of the engagement surface between the fifth grid 7 and the cylinder holder 12 is adjusted. In addition, since the cylinder holder 12 is inserted into the fifth grid 7, the axis of the cylinder holder 12 and the fifth grid 7 can be easily aligned.

FIG. 6B shows that the inner diameter of the cylinder holder 12 made of a high expansion material is formed to be larger than the outer diameter of the glass cylinder 14.
4 is arranged so as to cover the second end, the outer diameter of the fifth grid 7 is formed smaller than the inner diameter of the cylinder holder 12, and the fifth grid 7 is inserted into the cylinder holder 12. It is. A frit 23 is filled and welded between the inner surface of the cylinder holder 12 and the outer surface of the glass cylinder 14 (excluding the end surface of the glass cylinder 14), and the cylinder holder 12 and the fifth grid 7 are welded at the welding spot 21. Linked by

The feature of this embodiment is that the cylinder holder 1
By making the cylinder 2 cylindrical, the distance between the welding spot 21 and the welded portion 6 can be easily separated, so that deterioration of the welding strength due to thermal energy generated during welding can be suppressed. Therefore, as the cylinder holding member 12, for example, a thin member having a thickness of 0.15 to 0.30 mm can be used. Since the cylinder holding member 12 has a simple cylindrical shape, the cost can be reduced. In addition, glass cylinder 1
4 The frit 23 is hard to protrude into the inner surface,
Is easy to fill. Further, since the fifth grid 7 is inserted into the cylinder holder 12, the axis of the cylinder holder 12 and the fifth grid 7 can be easily aligned.

FIG. 6C shows the inner diameter of the cylinder holder 12 made of a high expansion material having a thickness of 1 mm or more.
The cylinder holder 12 is arranged so as to cover the second end of the glass cylinder 14, and the fifth grid 7 is welded to the end face of the cylinder holder 12 on the fifth grid 7 side. The spots 21 are connected by welding. A frit 23 is filled and welded between the inner surface of the cylinder holder 12 and the outer surface of the glass cylinder 14 (including the end surface of the glass cylinder 14).

A feature of this embodiment is that the fifth grid 7 and the cylinder holder 12 can be connected by welding in a state where the alignment is adjusted at the engagement surface.
FIG. 6D shows that the inner diameter of the cylinder holder 12 made of a high-expansion material having a thickness of 1 mm or more is formed larger than the outer diameter of the glass cylinder 14 so that the cylinder holder 12 covers the second end of the glass cylinder 14. And an end face of the cylinder holding body 12 on the fifth grid 7 side and the fifth grid 7 are connected by welding at a welding spot 21 portion. A frit 23 is filled and welded between the inner surface of the cylinder holder 12 and the outer surface of the glass cylinder 14 (excluding the end surface of the glass cylinder 14).

This embodiment is characterized in that the fifth grid 7 and the cylinder holder 12 can be connected by welding in a state where the engagement between the engagement surfaces is adjusted.
3 is easy to fill, and the frit 23 does not easily protrude into the inner surface of the glass cylinder 14.

FIG. 7E shows that the collar is formed on the cylinder holder 12, and the end face of the glass cylinder 14 is
The second flange is welded, and the end face of the fifth grid 7 on the side of the cylinder holder 21 is brought into contact with the flange of the cylinder holder 21. The glass cylinder 14 and the cylinder holder 12 are formed using materials having the same thermal expansion coefficient as each other. When the cylinder holder 12 is heated, an oxide film layer 26 is formed on the surface thereof, and the heated glass Cylinder 14 end face and cylinder holder 1
Weld the two collars directly. The cylinder holder 12 and the fifth grid 7 are connected by welding at a welding spot 21.

The feature of this embodiment is that the glass cylinder 1
Since welding can be performed only by increasing the temperature in a limited range near the end face of the glass cylinder 14 between the cylinder holder 4 and the cylinder holder 12,
Axis alignment is relatively easy. In addition, since the flange of the cylinder holder 12 and the end face of the fifth grid 7 are welded to each other, the position of the tube axis method can be easily set. Further, according to the cylinder holder 12 having the flange, the interval between the welding spot 21 and the welding portion 6 can be easily separated, so that it is possible to suppress the deterioration of the welding strength due to the heat energy generated at the time of welding. Become. Therefore, as the cylinder holder 12, for example, a thin material having a thickness of 0.15 to 0.30 mm can be used, and the cost can be reduced. In addition, since the cylinder holder 12 is inserted into the hole of the fifth grid 7, the axis of the cylinder holder 12 and the fifth grid 7 can be easily aligned.

FIG. 7F shows a state in which the collar is formed on the cylinder holder 12, and the end face of the glass cylinder 14 and the cylinder holder 1 are formed.
The second brim is brought into direct contact with the end face of the fifth grid 7 on the cylinder holding body 21 side and the brim of the cylinder holding body 21 is brought into contact with each other. The outer surface of the second end of the glass cylinder 14 and the flange of the cylinder holder 12 are welded using a frit 23, and the cylinder holder 12 and the fifth grid 7 are connected by welding at the welding spot 21.

The feature of this embodiment is that the cylinder holder 1
The configuration is such that the flange formed in the second 2 and the end face of the fifth grid 7 abut each other, so that the position in the tube axis direction can be easily set. Further, according to the cylinder holding body 12 having the flange, since the interval between the welding spot 21 and the welding portion 6 can be easily separated, it is possible to suppress the deterioration of the welding strength due to the heat energy generated at the time of welding. Become. Therefore, as the cylinder holding member 12, for example, a thin material having a thickness of 0.15 to 0.30 mm can be used, and the cost can be reduced.
Further, since the cylinder holder 12 is inserted into the hole of the fifth grid 7, the axis of the cylinder holder 12 and the fifth grid 7 can be easily aligned.

FIG. 7G shows a configuration in which the end face of the glass cylinder 14 and the cylinder holder 12 are welded, and the cylinder holder 12 has the getter 9, the getter support 11, and the spring 8. Glass cylinder 14 and cylinder holder 1
2 is formed by using materials having the same thermal expansion coefficient as each other, and when the cylinder holder 12 is heated, an oxide film layer 26 is formed on the surface thereof, and the heated glass cylinder 14 end face and the cylinder holder 12 are directly welded.

The feature of this embodiment is that the glass cylinder 1
Since welding can be performed only by increasing the temperature in a limited range near the end face of the glass cylinder 14 between the cylinder holder 4 and the cylinder holder 12,
Axis alignment is relatively easy. Further, since the cylinder holder 12 has the getter 9, the getter support 11 and the spring 8, the cylinder holder 12 has the function of the fifth grid 7, and the fifth grid 7 can be omitted.
Cost can be reduced.

FIG. 7H shows that the end face of the glass cylinder 14 and the cylinder holder 12 are brought into direct contact with each other,
Reference numeral 2 denotes a configuration having a getter 9, a getter support 11, and a spring 8. The outer surface of the second end of the glass cylinder 14 and the cylinder holder 12 are welded by using a frit 23.

The feature of this embodiment is that the glass cylinder 1
Since welding can be performed only by increasing the temperature in a limited range near the end face of the glass cylinder 14 between the cylinder holder 4 and the cylinder holder 12,
Axis alignment is relatively easy. Further, since the cylinder holder 12 has the getter 9, the getter support 11 and the spring 8, the cylinder holder 12 has the function of the fifth grid 7, and the fifth grid 7 can be omitted.
Cost can be reduced.

FIG. 7I shows that the end face of the glass cylinder 14 and the cylinder holder 12 are welded, and the flange formed on the cylinder holder 12 and the fifth grid 7 are welded to the welding spot 21.
The parts are connected by welding. The glass cylinder 14 and the cylinder holder 12 are formed using materials having the same thermal expansion coefficient as each other. When the cylinder holder 12 is heated, an oxide film layer 26 is formed on the surface thereof, and the heated glass The end face of the cylinder 14 and the cylinder holder 12 are directly welded.

The feature of this embodiment is that the glass cylinder 1
Since welding can be performed only by increasing the temperature in a limited range near the end face of the glass cylinder 14 between the cylinder holder 4 and the cylinder holder 12,
Axis alignment is relatively easy. In addition, since the end face of the fifth grid 7 on the side of the cylinder holding body 12 is brought into contact with the flange of the cylinder holding body 12, the position in the tube axis direction can be easily set. Further, according to the cylinder holding body 12 having the flange, since the interval between the welding spot 21 and the welding portion 6 can be easily separated, it is possible to suppress the deterioration of the welding strength due to the heat energy generated at the time of welding. Become. Therefore, for example, the thickness of the cylinder holder 12 may be 0.15 to 0.5 mm.
A thin material having a thickness of 30 mm can be used, and cost can be reduced. Further, the fifth grid 7 and the cylinder holder 12 are adjusted in a state where the alignment is adjusted on the engagement surface.
And can be connected by welding.

FIG. 7J shows the end surface of the glass cylinder 14 and the glass cylinder 1 of the cylinder holder 12 having a thickness of 1 mm or more.
One end face of the fourth side is welded, and the other end face of the cylinder holder 12 and the fifth grid 7 are connected by welding. The glass cylinder 14 and the cylinder holder 12 are formed using materials having the same thermal expansion coefficient as each other. When the cylinder holder 12 is heated, an oxide film layer 26 is formed on the surface thereof, and the heated glass The end face of the cylinder 14 and the end face of the cylinder holder 12 are directly welded.

The feature of this embodiment is that the glass cylinder 1
Since welding can be performed only by increasing the temperature in a limited range near the end face of the glass cylinder 14 between the cylinder holder 4 and the cylinder holder 12,
Axis alignment is relatively easy. In addition, since the end surface of the fifth grid 7 on the side of the cylinder holder 12 and the end surface of the cylinder holder 12 are brought into contact with each other, the position in the tube axis direction can be easily set. Further, the fifth grid 7 and the cylinder holder 12 can be connected to each other by welding at the welding spot 21 in a state where the alignment is adjusted on the engagement surface.

In each of the embodiments according to the present invention described above, the case where a glass cylinder is used as the hollow cylinder has been described. However, the present invention is not limited to this. It is also possible to use a formed cylinder.

It is also possible to use an electron gun having a bipotential structure instead of an electron gun having a unipotential structure. Furthermore, in the present embodiment, the case where two multi-form rods are used has been described, but the present invention is not limited to this, and may be applied to an electron gun using three or four multi-form rods. Is also possible.

[0066]

As described above, according to the present invention, the reliability of the connection strength between the hollow cylinder (glass cylinder) and the cylinder holder is improved, and the deterioration of the connection strength generated in the welding step and the welding step is prevented. Can be prevented. Therefore, it is possible to stably supply a desired potential to the resistive layer forming the electrostatic lens, and appropriately focus the electron beam.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a cathode ray tube having an electron gun according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view showing a configuration near a first end of the electron gun shown in FIG. 1;

FIG. 3 is an enlarged sectional view showing a configuration near a second end of the electron gun shown in FIG. 1;

FIG. 4 is a sectional view showing another embodiment near the first end shown in FIG. 2;

FIG. 5 is a sectional view showing another embodiment near the first end shown in FIG. 2;

FIG. 6 is a sectional view showing another embodiment near the second end shown in FIG. 3;

FIG. 7 is a sectional view showing another embodiment near the second end shown in FIG. 3;

FIG. 8 is a partial cross-sectional view of a cathode ray tube having an electron gun according to the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heater 2 Cathode 3 Multiform rod 4,6 Welding part 5 Resistance layer 7 Fifth grid 8 Spring 9 Getter 10 Valve 11 Getter support 12 Cylinder holder 13 Neck part 14 Insulated hollow cylinder (glass cylinder) 15 Fourth grid 16 Focusing structure part 17 Cylinder holder 18 Third grid 19 First grid 20 Second grid 21 Weld spot 22 Inner surface duck 23 Frit 25 Electron beam forming part 26 Oxide coating

Claims (7)

[Claims] A bulb having a phosphor screen formed on one inner surface and a neck formed on the other side;
An electron beam forming part having a cathode and an electrode, a focusing structure part having an insulating hollow cylinder having a resistive layer formed on the inner surface, and a support part for performing axis alignment of the electron beam are sequentially connected in the electron beam emitting direction. The electron beam forming unit side of the insulating hollow cylinder, the electrode of the electron beam forming unit, and the fluorescent screen end of the insulating hollow cylinder. At least one of the support portions is connected via a cylinder holder having a hole coaxially with the insulating hollow cylinder, and the thermal expansion coefficient of the cylinder holder is set to be larger than the thermal expansion coefficient of the insulating hollow cylinder. A cathode ray tube characterized by the above. 2. The cathode wire according to claim 1, wherein an inner diameter of the hole of the cylinder holder is formed larger than an outer diameter of the insulating hollow cylinder, and the insulating hollow cylinder is inserted into a part of the cylinder holder. tube. 3. The cathode ray tube according to claim 1, wherein a collar is formed at one end of the cylinder holder, and an end surface of the insulating hollow cylinder is connected to the collar of the cylinder holder. 4. The cathode ray tube according to claim 1, wherein the cylinder holder and the insulating hollow cylinder are connected via a frit. 5. The cathode ray tube according to claim 1, wherein the cylinder holder has an oxide film. 6. The cathode ray tube according to claim 4, wherein the thickness of the cylinder holder is set to a certain value or more so that the temperature of the insulating hollow cylinder and the frit does not reach the annealing point. 7. The cathode ray tube according to claim 1, wherein a resistance layer is spirally formed on an inner wall of the insulating hollow cylinder.