JPH0831341A - Color picture tube - Google Patents

Abstract

PURPOSE:To provide a safe and high reliability color picture tube of such a structure that an exhaust pipe for evacuation is joined with the side wall of an envelope. CONSTITUTION:A color picture tube is equipped with a vacuum envelope 14 at least having a side wall 10 in the firm of a rectangular framing, a face plate 11 which is installed at one end of the side wall and is flat and rectangularly shaped approximately, and a rear plate 12 which is installed at the other end of the side wall, confronts the face plate parallel, and is flat and rectangularly shaped. This envelope of image receiving tube has an exhaust pipe 16 for evacuation which remains internally, and the pipe is fixed to the side wall and extended in bend along the outside surface of the side wall.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color picture tube provided with a vacuum envelope having a flat face plate and a rear plate, and more particularly to a color picture tube having a vacuum exhaust tube attached to a side wall of the vacuum envelope. Regarding tubes.

[0002]

2. Description of the Related Art In recent years, various studies have been made on high-definition broadcasting or a high-resolution picture tube having a large screen accompanying the broadcasting. Generally, in order to achieve high resolution of the picture tube, the spot diameter of the electron beam on the phosphor screen must be reduced.

On the other hand, conventionally, the electrode structure of the electron gun has been improved, or the electron gun itself has been increased in diameter and length, but sufficient results have not yet been obtained. The main reason for this is that as the tube becomes larger, the distance from the electron gun to the phosphor screen becomes longer and the magnification of the electron lens becomes too large. Therefore, in order to achieve high resolution, it is important to reduce the distance (depth) from the electron gun to the phosphor screen.
Further, in this case, wide-angle deflection causes an increase in the difference in magnification between the center and the periphery of the screen. Therefore, wide-angle deflection is not a good idea for high resolution.

Therefore, conventionally, a method of arranging a plurality of independent small picture tubes to obtain a high-resolution large screen is disclosed in JP-A-48-90428, JP-A-49-21019 and JP-A-53. -117130 gazette etc. are disclosed. This kind of method is effective for displaying a huge screen with a large number of divisions arranged outdoors, but the screen size is 40
When displaying a medium-sized large screen of about inch, the connection part of the screen between each area is conspicuous and an unpleasant image is reproduced.
Therefore, when used as a home television receiver or as a terminal for graphic display in computer-aided design (CAD), the connection part of the screen becomes a fatal defect.

In contrast, US Pat. No. 3,071,7
No. 06 specification, Japanese Utility Model Publication No. 39-25641, Japanese Patent Publication No. 42-4928, Japanese Patent Publication No. 50-17167, etc., have a structure in which a plurality of independent picture tube phosphor cleans are integrated. Is disclosed. A picture tube having a phosphor screen of this integrated structure is a vacuum envelope formed by a face plate on which a phosphor screen is formed, a rear plate arranged facing the face plate, and a plurality of funnels adjacent to the rear plate. Vessels are configured.

However, in such a structure, when the screen surface becomes large, the face plate and the rear plate must be thickened so as to withstand the atmospheric pressure load (external pressure), and the tube axis direction is increased. It is also necessary to give a large curvature to. As a result, the weight of the envelope becomes heavy.
Further, when the curvature of the face plate becomes large, the screen becomes difficult to see. Furthermore, the distance between the phosphor screen and the electron gun enclosed in the neck becomes large, and the electron lens becomes unfavorable in terms of magnification.

As a picture tube which solves the problems of the picture tube having the phosphor screen of the above-mentioned integrated structure, Japanese Patent Application Laid-Open No. 5-3.
No. 6363 discloses that a face plate is flattened and a phosphor screen having an integrated structure formed on the inner surface of the face plate is formed by electron beams emitted from a plurality of electron guns arranged in a plurality of necks. A picture tube divided into a plurality of areas for scanning (color picture tube)
It is shown. In this picture tube, in order to support the atmospheric pressure load applied to the flat face plate and the flat rear plate facing the face plate, a plate support is provided between the face plate and the rear plate inside the vacuum envelope. Means are arranged.

Generally, in a picture tube, in the manufacturing process thereof, after arranging various kinds of tube inner members in the envelope, the inside of the envelope is evacuated through a vacuum exhaust pipe to create a vacuum. In the tube, the vacuum exhaust tube is attached to a stem that seals the neck end of the funnel. However, in the color picture tube disclosed in the above-mentioned Japanese Patent Laid-Open No. 5-36363, it is not easy to attach a vacuum exhaust tube to the stem that seals the neck end of the color picture tube for exhausting, and because of the exhaust tube. The shape of the envelope becomes complicated. Further, in the case of a picture tube having a plurality of necks such as the picture tube disclosed in the same publication, if a vacuum exhaust tube is attached to each neck and exhausted, all of the plurality of vacuum exhaust tubes are exhausted. It has to be connected to the exhaust device, which requires a lot of time and labor, which leads to a decrease in productivity. As another method, if a vacuum exhaust pipe is attached to one selected neck out of a plurality of necks and exhaust is performed, when a vacuum exhaust pipe is attached to each of the plurality of necks to exhaust. The problem is solved, but in this case the diameter of the neck determines the maximum diameter of the vacuum exhaust tube, which makes the vacuum exhaust tube thinner than that of a normal picture tube. As a result, the exhaust efficiency is reduced and the productivity is reduced.

Still another method is Japanese Patent Laid-Open No. 5-159.
As disclosed in Japanese Patent No. 726, as shown in FIG. 4, it is proposed that a vacuum exhaust pipe 2 be attached to the side wall of the envelope 1 to exhaust the air. However, when the vacuum exhaust pipe 2 is attached to the side wall of the envelope 1 in this way, the remaining portion of the vacuum exhaust pipe 3 after being exhausted and sealed as shown by the broken line is located outside the envelope 1 after exhausting. It greatly protrudes. Therefore, when such a picture tube is handled in the manufacturing process or mounted on the cabinet after the picture tube is completed, the vacuum exhaust tube 3 comes into contact with other members and may be broken in some cases to make the picture tube defective. Not only that, but in the worst case, there is a possibility that the breakage may cause the implosion of the envelope 1. Further, if the projection length of the vacuum exhaust pipe 3 is to be made as short as possible, the position near the side wall of the envelope 1 must be heated and sealed. Therefore, the vacuum exhaust pipe 2
The side wall of the envelope 1 to which is attached and the joint between the vacuum exhaust pipe 2 and the side wall are heated to a high temperature. The joining portion of the vacuum exhaust pipe 2 is structurally weaker than other portions of the side wall because, for example, an opening is formed in the side wall and the vacuum exhaust pipe 2 is joined by frit glass or the like. . Therefore, when the side wall or the joint between the vacuum exhaust pipe 2 and the side wall is heated as described above, cracks easily occur due to the thermal strain.

[0010]

As described above, a plurality of phosphor screens having an integrated structure formed on the inner surface of a flat face plate are used as a color picture tube which provides a high-resolution, short-depth, easy-to-see screen. There is known a color picture tube in which an electron beam emitted from a plurality of electron guns arranged in the neck of a funnel is divided into a plurality of areas for scanning.

In the manufacturing process of such a color picture tube, it is not easy to attach a vacuum exhaust tube to a stem which seals the neck end portion of the funnel and exhaust it like a normal picture tube. The exhaust pipe complicates the envelope shape. Furthermore, if a vacuum exhaust pipe is attached to each neck for exhausting, it is necessary to connect all of the plurality of vacuum exhaust pipes to the exhaust device, which requires a lot of time and labor for connection, and productivity. Cause a decrease in. As another method, if a vacuum exhaust pipe is attached to one selected neck out of a plurality of necks to exhaust the gas, a problem occurs when the vacuum exhaust pipe is attached to each of the plurality of necks to exhaust. However, in this case, the maximum diameter of the vacuum exhaust pipe is determined by the diameter of the neck, so the vacuum exhaust pipe becomes thinner than that of a normal picture tube, exhaust efficiency decreases, and productivity increases. Cause a decrease in.

As still another method, a method has been proposed in which a vacuum exhaust pipe is attached to the side wall of the envelope to exhaust the gas. However, when the vacuum exhaust pipe is attached to the side wall of the envelope in this way, the exhaust gas is exhausted. The remaining portion of the vacuum exhaust pipe after the post-sealing largely projects to the outside of the envelope. Therefore, when handling this picture tube in the manufacturing process, or when installing it in the cabinet after the picture tube is completed, the vacuum exhaust tube contacts other members,
Depending on the case, not only the picture tube may be broken to make the picture tube defective, but in the worst case, the breakage may induce the implosion of the envelope. Also, if the length of the vacuum exhaust pipe is made to be as short as possible, the position near the side wall of the envelope must be heated and sealed. Therefore, the envelope to which the vacuum exhaust pipe is attached must be heated. The joints of the exhaust pipe, which are structurally weaker than other parts of the side wall, are cracked due to thermal strain. There is a problem that it becomes easier to do.

The present invention has been made to solve the above problems. Even if a vacuum exhaust pipe is attached to the side wall of an envelope having a substantially rectangular flat face plate, the side wall and the vacuum pipe are attached. An object of the present invention is to reduce the influence of thermal strain on the joint between the exhaust pipe and the side wall and to construct a safe and highly reliable color picture tube.

[0014]

A rectangular frame-shaped side wall, a substantially rectangular flat face plate provided at one end of the side wall, and a face plate provided at the other end of the side wall and parallel to the face plate. In a color picture tube in which a vacuum envelope having at least a substantially rectangular flat rear plate facing each other is provided, and the vacuum exhaust pipe of this envelope remains in the envelope, the vacuum exhaust pipe is attached to the side wall. The vacuum exhaust pipe was bent and extended along the outer surface of the side wall.

Further, a rectangular frame-shaped side wall, a substantially rectangular flat face plate provided on one end side of the side wall, and a substantially rectangular face plate provided on the other end side of the side wall and facing in parallel with the face plate. In a color picture tube having a vacuum envelope having at least a flat rear plate, and a vacuum exhaust tube of the envelope remaining in the envelope, at least one side of the face plate and the rear plate is a side wall. Of the vacuum exhaust pipe was attached to the side wall, and the vacuum exhaust pipe was extended along the outer surface of the side wall to the inside of the protruding portion of at least one of the face plate and the rear plate. .

Further, the vacuum exhaust pipe is located at a position lower than the width of the protruding portion of at least one of the face plate and the rear plate.

[0017]

[Function] As described above, the vacuum exhaust pipe is attached to the side wall,
By bending and extending the vacuum exhaust pipe along the outer surface of the side wall, it is possible to prevent the vacuum exhaust pipe from significantly protruding to the outside of the envelope. Further, the vacuum exhaust pipe can be sealed at a position away from the joint between the vacuum exhaust pipe and the side wall, and the influence of heat at the time of sealing the vacuum exhaust pipe on the joint between the vacuum exhaust pipe and the side wall. Can be reduced.

Further, at least one side of the face plate and the rear plate is projected outside the outer surface of the side wall, a vacuum exhaust pipe is attached to the side wall, and the vacuum exhaust pipe is attached to the face along the outer surface of the side wall. If the vacuum exhaust pipe is extended to the inside of the protruding portion of at least one of the plate and the rear plate, and more preferably, the vacuum exhaust pipe is located at a position lower than the width of the protruding portion of at least one of the face plate and the rear plate, a vacuum is generated. The exhaust pipe for the vacuum can be prevented from protruding significantly outside the envelope, and the exhaust pipe for vacuum can be sealed at a position away from the joint between the exhaust pipe for vacuum and the side wall. Not only can the effect of heat when sealing the vacuum exhaust pipe on the joint between the pipe and the side wall be reduced, but also with the face plate or rear plate or both. Protect air exhaust pipe, can be made to an external force is not applied directly to the exhaust pipe for vacuum.

[0019]

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

Example 1. FIG. 1 shows a color picture tube of the first embodiment. This color picture tube has a rectangular frame-shaped glass side wall 10 of a constant width, a substantially rectangular flat glass face plate 11 having a peripheral portion joined to one end of the side wall 10, and the side wall 10 The peripheral portion is joined to the other portion side, and is joined around a substantially rectangular flat glass rear plate 12 facing the face plate 11 in parallel, and a plurality of apertures formed in the rear plate 12. A vacuum envelope 1 including a plurality of glass funnels 13
4 In particular, the illustrated vacuum envelope 14 includes a sidewall 10
Outer surface and face plate 11 and rear plate 12
The end faces 15 of are joined so as to form substantially the same plane.

Further, in this color picture tube, a vacuum exhaust pipe 16 for exhausting the inside of the envelope 14 is joined to the side wall 10 of the upper long side, and the inside of the envelope 14 is exhausted on the side wall 10 and then sealed. The rest remains. The vacuum exhaust pipe is bent along the outer surface of the side wall 10 near the joint with the side wall 10 and extends in a direction orthogonal to the width direction of the side wall 10.

In the illustrated example, the plurality of funnels 13 are five in the horizontal direction and four in the vertical direction, for a total of 20 funnels.
The openings are formed in the rear plate 12, and 20 funnels 13 are joined around each of the openings. Furthermore, the face plate 11, the rear plate 12, and the funnel 13 in the vacuum envelope 14 are also included.
Are joined by frit glass.

On the inner surface of the face plate 11, there is formed a light absorption layer consisting of black stripes, and a stripe-shaped three-color phosphor layer which emits light of blue, green and red provided in a gap portion of the light absorption layer. A phosphor screen is formed,
A flat shadow mask having a large number of electron beam passage holes formed therein is arranged facing the phosphor screen. An electron gun that emits an electron beam is arranged in each neck 17 of the plurality of funnels 13.

In this color picture tube, a deflecting device (not shown) mounted outside the funnels 13 for emitting electron beams emitted from a plurality of electron guns arranged in the necks 17 of the funnels 13 is shown. (2), the phosphor screen is deflected in the horizontal and vertical directions, and the phosphor screen is divided into a plurality of regions through the shadow mask. In the illustrated example, the phosphor screen is divided into 5 parts in the horizontal direction and 4 parts in the vertical direction.
Scanning is performed by dividing into 0 areas. The rasters drawn on the phosphor screen by this divisional scanning are connected by the signals applied to the electron gun and the deflection device, and one large raster without a break is drawn on the entire surface of the phosphor screen.

By the way, like the color picture tube, a phosphor screen having an integrated structure is formed on the inner surface of the flat face plate 11, and the phosphor screens are formed by a plurality of electron beams emitted from a plurality of electron guns. In a color picture tube which is divided into individual regions and scanned, a vacuum exhaust pipe 16 is joined to the side wall 10 on the upper long side of the vacuum envelope 14, and the vacuum exhaust pipe 16 is joined to the side wall 10. By bending it in the vicinity and extending it in the direction orthogonal to the width direction of the side wall 10, it is possible to prevent the vacuum exhaust pipe 16 from significantly projecting to the outside of the vacuum envelope 14, and thus, in the manufacturing process. Damage caused by contact with other members during handling after mounting the vacuum exhaust tube or during handling after manufacturing the color picture tube can be greatly reduced. Further, the vacuum exhaust pipe 16 after exhaust can be sealed at a position distant from the joint with the side wall 10, and the influence of heating at the time of sealing the vacuum exhaust pipe is vulnerable to thermal distortion. It is possible not to provide a joint between 16 and the side wall 10. Further, as described above, when the vacuum exhaust pipe 16 is bent near the joint with the side wall 10 and extends in the direction orthogonal to the width direction of the side wall 10,
The diameter of the vacuum exhaust pipe 16 is close to the width of the side wall 10 so that the exhaust efficiency can be improved. Therefore, with the above-described structure, the color picture tube can be manufactured stably and efficiently, and a safe and highly reliable color picture tube can be obtained.

Example 2. FIG. 2 shows a color picture tube of the second embodiment. This color picture tube has a rectangular frame-shaped glass side wall 10 of a constant width, a substantially rectangular flat glass face plate 11 having a peripheral portion joined to one end of the side wall 10, and the side wall 10 The peripheral portion is joined to the other portion side, and is joined around a substantially rectangular flat glass rear plate 12 facing the face plate 11 in parallel, and a plurality of apertures formed in the rear plate 12. A vacuum envelope 1 including a plurality of glass funnels 13
4 The above structure is the same as that of the first embodiment. Particularly, in the color picture tube of the illustrated example, the outer shapes of the face plate 11 and the rear plate 12 are larger than the outer shape of the side wall 10.
The outer peripheral portion of 2 projects outside the side wall 10.

Further, in this color picture tube, a vacuum exhaust pipe 16 for exhausting the inside of the envelope 14 is joined to the side wall 10 of the upper long side, and the inside of the envelope 14 is exhausted on the side wall 10 and then sealed. The rest remains. The vacuum exhaust pipe is bent along the outer surface of the side wall 10 near the joint with the side wall 10 and extends in a direction orthogonal to the width direction of the side wall 10.

In the illustrated example, the plurality of funnels 13 are five in the horizontal direction and four in the vertical direction, for a total of 20.
The openings are formed in the rear plate 12, and 20 funnels 13 are joined around each of the openings. Furthermore, the face plate 11, the rear plate 12, and the funnel 13 in the vacuum envelope 14 are also included.
Are joined by frit glass.

Since the other structure of this color picture tube is the same as that of the first embodiment, its explanation is omitted.

Like this color picture tube, a phosphor screen having an integrated structure is formed on the inner surface of the flat face plate 11, and the phosphor screen is divided into a plurality of electron beams emitted from a plurality of electron guns. In a color picture tube that is divided into regions and scanned, the outer shapes of the face plate 11 and the rear plate 12 of the vacuum envelope 14 are made larger than the outer shape of the side wall 10, and the outer peripheral portions of the face plate 11 and the rear plate 12 are the side walls. A vacuum exhaust pipe 16 is joined to the upper long side wall 10 of the vacuum envelope 14 so as to project outside the vacuum envelope 10.
Bending 6 near the joint with the side wall 10 and extending in a direction orthogonal to the width direction of the side wall 10, the vacuum exhaust pipe 1
6 can be positioned so as to be hidden between the face plate 11 and the rear plate 12. Normally, the face plate 11 and the rear plate 12 are formed to have a large plate thickness so as to withstand the atmospheric pressure load. Therefore, by locating the vacuum exhaust pipe 16 as described above, the face plate 11 and the rear plate 12 are positioned. The vacuum exhaust pipe 16 can be protected by and the damage caused by contact with other members during handling after mounting the vacuum exhaust pipe in the manufacturing process or during handling after manufacturing the color picture tube can be significantly reduced. You can Also, the exhaust pipe 16 for vacuum after exhausting
Can be carried out at a position far away from the joint with the side wall 10, and the joint between the side wall 10 and the vacuum exhaust pipe 16 which is vulnerable to thermal distortion due to the effect of heating at the time of sealing the vacuum exhaust pipe. You can choose not to give. When the vacuum exhaust pipe 16 is bent near the joint with the side wall 10 and extends in the direction orthogonal to the width direction of the side wall 10 as described above, the vacuum exhaust pipe 16 has the width of the side wall 10. The exhaust efficiency can be improved by making the diameters close to each other. Therefore, with the above-described structure, the color picture tube can be manufactured stably and efficiently, and a safe and highly reliable color picture tube can be obtained.

In the first embodiment, the vacuum exhaust pipe 16 extends in the direction orthogonal to the width direction of the side wall 10. However, as shown in FIG. It may be extended to the side where the neck 17 is present.

In the second embodiment, the outer shapes of both the face plate and the rear plate are formed to be larger than the outer shape of the side wall so that the vacuum exhaust pipe is hidden by the face plate and the rear plate. Even if the vacuum exhaust pipe is protruded to the outer side of the crown less than the face plate and the rear plate, substantially the same effect can be obtained.

In the second embodiment, the outer shapes of both the face plate and the rear plate are formed to be larger than the outer shape of the side wall. However, one of the face plate and the rear plate is formed to be larger than the outer shape of the side wall. However, the same effect can be obtained.

[0034]

EFFECTS OF THE INVENTION A rectangular frame-shaped side wall and a substantially rectangular flat face plate provided on one end side of the side wall,
A vacuum envelope having at least the substantially rectangular flat rear plate provided on the other end side of the side wall and facing the face plate in parallel is provided, and the vacuum exhaust pipe of this envelope remains in the envelope. In the color picture tube, the vacuum exhaust pipe is attached to the side wall, and when the vacuum exhaust pipe is bent and extends along the outer surface of the side wall, the vacuum exhaust pipe does not largely project to the outside of the envelope. You can Further, the vacuum exhaust pipe can be sealed at a position away from the joint between the vacuum exhaust pipe and the side wall, and the influence of heat at the time of sealing the vacuum exhaust pipe on the joint between the vacuum exhaust pipe and the side wall. Can be reduced.

Further, at least one side of the face plate and the rear plate is protruded outside the outer surface of the side wall, a vacuum exhaust pipe is attached to the side wall, and the vacuum exhaust pipe is attached to the face plate or the side wall along the side wall. When the vacuum exhaust pipe is extended to the inside of the rear plate, and more preferably, the vacuum exhaust pipe is located at a position lower than the width of the protruding portion of at least one of the face plate and the rear plate, the vacuum exhaust pipe is disposed in the envelope. It is possible to prevent it from protruding significantly outward. Also, by sealing the vacuum exhaust pipe at a position away from the joint between the vacuum exhaust pipe and the side wall, the effect of heat when sealing the vacuum exhaust pipe on the joint between the vacuum exhaust pipe and the side wall is reduced. In addition, the vacuum exhaust pipe can be protected by the face plate and / or the rear plate so that no external force is applied to the vacuum exhaust pipe. As a result, it is possible to obtain a safe and highly reliable color picture tube.

[Brief description of drawings]

FIG. 1 (a) is a perspective view showing the configuration of a color picture tube of Embodiment 1 of the present invention, and FIG. 1 (b) is a front view thereof.

FIG. 2 (a) is a perspective view showing the configuration of a color picture tube of Embodiment 2 of the present invention, and FIG. 2 (b) is a front view thereof.

FIG. 3 is a perspective view showing another configuration different from the color picture tube of the present invention.

FIG. 4 is a view showing a structure of a conventional picture tube in which a vacuum exhaust tube is attached to a side wall of an envelope.

[Explanation of symbols]

 10 ... Side wall 11 ... Face plate 12 ... Rear plate 13 ... Enclosure 16 ... Vacuum exhaust pipe

Claims (3)

[Claims] 1. A rectangular frame-shaped side wall, and a substantially rectangular flat face plate provided on one end side of the side wall,
A vacuum envelope having at least a substantially rectangular flat rear plate that is provided on the other end side of the side wall and faces the face plate in parallel is provided, and a vacuum exhaust pipe of the envelope has the envelope. In the color picture tube remaining in the container, the vacuum exhaust tube is attached to the side wall, and the vacuum exhaust tube is bent and extends along the outer surface of the side wall. 2. A rectangular frame-shaped side wall, and a substantially rectangular flat face plate provided on one end side of the side wall,
A vacuum envelope having at least a substantially rectangular flat rear plate that is provided on the other end side of the side wall and faces the face plate in parallel is provided, and a vacuum exhaust pipe of the envelope has the envelope. In the color picture tube remaining in the container, at least one side of the face plate and the rear plate protrudes outside the outer surface of the side wall, and the vacuum exhaust tube is attached to the side wall. A color picture tube, wherein the tube extends along the outer surface of the side wall and inside the protruding portion of at least one of the face plate and the rear plate. 3. The color picture tube according to claim 2, wherein the vacuum exhaust tube is located at a position lower than the width of the protruding portion of the face plate or the rear plate.