JPH0757664A - Cathode-ray tube and manufacture thereof - Google Patents

Abstract

PURPOSE:To provide a cathode-ray tube having sufficient withstanding strength to an atmospheric pressure load applied to a vacuum envelope. CONSTITUTION:A cathode-ray tube has a vacuum envelope having an almost rectangular flat first plate 1, a side wall 2 extending substantially vertically by being joined to a peripheral end part of this first plate and a flat second plate 3 opposed in parallel to the first plate by being joined to this side wall. In the cathode-ray tube where support bodies 11 to support the first and the second plates are arranged between these first and second plates or the cathode- ray tube where a length in the tube axis direction of the support bodies 11 is longer than a length in the tube axis direction of the support bodies 11, when the side wall and the first or the second plate are joined together, these are joined together while applying a tube axis directional load to 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 cathode ray tube such as a color picture tube, and in particular, a flat face plate and a flat rear plate are joined via a side wall, and the face plate and the flat rear plate are joined together. The present invention relates to a cathode ray tube in which a support is arranged and a method for manufacturing the same.

[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. The face plate is made of glass, and the rear plate is made of glass or metal.

However, in such a structure, when the screen surface becomes large, the face plate and the rear plate must be made thick so as to withstand the atmospheric pressure load, and the curvature in the axial direction of the pipe is large. It is also necessary to have it. 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.

Particularly, when the rear plate is made of metal, it is extremely effective when the funnel is not formed to project on the rear plate. Even when the funnel is protruding, when the phosphor screen is divided into a plurality of regions and scanned by the electron beams emitted from the electron guns arranged in the necks of the plurality of funnels, the cathode ray tube The complicated rear plate shape of the envelope can be made simple.

However, the cathode ray tube which scans the phosphor screen by dividing the phosphor screen into a plurality of regions by the electron beams emitted from the electron guns arranged in the necks of the plurality of funnels, is used for each electron gun for the phosphor screen. However, the metal rear plate is more likely to be deformed by the atmospheric pressure load than the glass rear plate, and the deformation changes the relative position of the electron gun.
The quality of the image drawn on the phosphor screen easily deteriorates.

Therefore, as a metal rear plate,
It is effective for a cathode ray tube that does not affect the members inside the tube or the trajectory of the electron beam even if it is deformed by atmospheric pressure, but it can be changed by the electron beam emitted from each electron gun placed in the neck of multiple funnels. A cathode ray tube that scans a phosphor screen divided into a plurality of regions requires design and manufacturing that takes into account the change in the relative position of the electron gun due to deformation.
Not always effective.

In order to solve the problem of the cathode ray tube having the phosphor screen of the integral structure, the face plate is flattened and one phosphor screen of the integral structure is formed on the inner surface of the face plate. There is a cathode ray tube which is divided into a plurality of regions and scanned by an electron beam emitted from an electron gun. In such a cathode ray tube, in order to support the atmospheric pressure load applied to the flat face plate, it is necessary to arrange a support inside the face plate.

Providing a support inside a flat faceplate to carry atmospheric loads in this manner is known in connection with solar heat collectors that create a vacuum inside the envelope and also for flat screens. Also as a cathode ray tube having the same, JP-A-56-106353 and JP-A-62-27243.
No. 2, JP-A-62-285335, JP-A-Sho 6
3-128532, JP-A-48-90183, JP-A-64-10553, JP-A-1-117.
No. 251, for example.

The support is a long plate or needle. Particularly, a long plate-like body prevents the concentration of atmospheric pressure load by supporting the face plate with a relatively wide contact area.

By the way, with respect to the above-mentioned support, a flat substantially rectangular glass face plate, a glass side wall extending vertically from the peripheral edge of the face plate, and a face parallel to the face plate via the side wall. A color picture tube having a vacuum envelope having a flat and substantially rectangular glass rear plate, and a support for supporting the face plate and the rear plate against atmospheric pressure load is arranged inside the envelope. It turned out to be a major problem when manufacturing.

That is, in the manufacture of the color picture tube, first, the support is fixed to the rear plate, and the side wall pieces made of a plurality of plate glasses are joined by a joining material such as frit glass to form the side wall, and at the same time, the side wall is formed. The rear plate to which the support is fixed is also joined by a joining material such as frit glass. At this time, the sidewall piece needs to be vertically joined to the rear plate due to problems such as strength when the envelope is evacuated. Since the side wall piece has a thickness of several millimeters like the face plate and the rear plate, it is necessary to prevent the side wall piece from falling over during heat treatment. Then, the face plate having the phosphor screen formed thereon is joined to the side wall joined to the rear plate with a joining material. At this time, a difference in height between the side wall and the support fixed to the rear plate poses a problem.

The difference in height between the side wall and the support is largely related to the heat treatment for joining the side wall and the rear plate. That is, the bonding with frit glass is about 4
It is carried out by sintering frit glass obtained by heating at 50 ° C., but the length of the plate glass constituting the side wall is
Because it is almost the same length as the peripheral edge of the rear plate and long,
It is difficult to heat the entire length with a uniform temperature distribution. As a result, a thick portion and a thin portion are formed in the bonding layer due to the non-uniform temperature distribution, and the height from the rear plate to the bonding surface between the side plate and the face plate has a difference of 0.5 to 1.0 mm. In extreme cases, some parts are not joined.
The difference in the height of the side wall partially generated in this way appears as a step between adjacent side wall pieces, particularly when a plurality of side wall pieces are joined to form the side wall.

If there is a difference in height from the rear plate to the joint surface of the side wall with the face plate, the height of the support fixed to the rear plate becomes a problem.

Originally, the support is provided between the face plate and the rear plate to support the atmospheric pressure load applied thereto and to secure the pressure resistance of the color picture tube.
In order that all the plurality of supports come into contact with the face plate, the height thereof needs to be strictly controlled so as to have an error range of several tens of microns. If this height variation is large, the face plate is locally stressed by the atmospheric pressure load applied to the vacuum envelope. If there is a support that does not come into contact with the face plate, the face plate is largely deformed at that portion and cracks occur.

This means that even if the height of the support is strictly controlled, if the height from the rear plate to the joint surface of the side wall with the face plate is different as described above, the side wall and the support are separated. It does not match the height. For example, the bonding layer is thick,
When the height difference is partially generated at the joint surface between the side wall and the face plate, the side wall becomes partially higher than the support body, and when the face plate is joined to this side wall, the space between the face plate and the support body is increased. There is a gap in As a result, the face plate is largely deformed by the atmospheric pressure load applied to the vacuum envelope, and a crack is generated. Further, even when the side wall is not sufficiently joined to the rear plate and is floating, even if the face plate is joined to the side wall, a gap is similarly created between the face plate and the support body, and the side wall is added to the vacuum envelope. The face plate is greatly deformed by the atmospheric pressure load and cracks are generated.

Such a problem becomes remarkable as the cathode ray tube becomes larger and the side wall becomes longer. Moreover, it is difficult to improve even if the manufacturing process is changed, and the same problem occurs.

[0020]

As described above, as a high resolution picture tube having a large screen, a substantially rectangular flat face plate made of glass, and a glass side wall extending vertically from the peripheral edge of the face plate. And a vacuum envelope having a substantially rectangular flat glass rear plate facing in parallel with the face plate through the side wall, and an atmospheric pressure load applied to the face plate and the rear plate inside the envelope. There has been proposed a color picture tube in which a support that supports the color picture tube is arranged.

In this color picture tube, a support is fixed to a rear plate, and side wall pieces made of a plurality of plate glasses are joined by a joining material such as frit glass to form a side wall, and at the same time, the side wall and the support are joined together. It is manufactured by joining the fixed rear plate with a joining material such as frit glass, and then joining the face plate on which the phosphor screen is formed to the side wall joined to the rear plate. However, when manufactured by such a method, there is a difference in height of the side wall joined to the rear plate. Due to the resulting difference in height between the side wall and the support, even if the face plate is joined to the side wall, it may not come into contact with the support. Therefore, there is a problem that the face plate is deformed due to the atmospheric pressure load applied to the vacuum envelope, and a crack is generated.

The present invention has been made to solve the above problems, and has a substantially rectangular flat face plate, a side wall extending vertically from the peripheral edge of the face plate, and a face via the side wall. A cathode ray tube having a vacuum envelope having a substantially rectangular rear plate facing in parallel with the plate, and a face plate and a support supporting the rear plate being arranged inside the envelope.
It is an object of the present invention to construct a safe cathode ray tube having sufficient pressure resistance against an atmospheric pressure load applied to a vacuum envelope by preventing a height difference between sidewalls during manufacturing.

[0023]

[Means for Solving the Problems] First flat surface having a substantially rectangular shape
A vacuum envelope having a plate, a side wall extending substantially perpendicularly from a peripheral portion of the first plate, and a second flat plate having a substantially rectangular shape and disposed through the side wall and facing in parallel to the first plate. A phosphor screen adhered to the inner surface of the first plate, a plurality of electron guns arranged on the second plate side and scanning the phosphor screen by dividing the phosphor screen into a plurality of regions; In a cathode ray tube provided between the second plates and having a support for supporting these first and second plates, the length of the support in the tube axis direction is made longer than the length of the side wall in the tube axis direction.

Also, a substantially rectangular flat first plate,
A vacuum envelope having a side wall joined to a peripheral portion of the first plate and extending substantially vertically, and a flat second plate joined to the side wall and facing parallel to the first plate; In a method of manufacturing a cathode ray tube in which a support body for supporting the first and second plates is arranged between the first and second plates, when the side wall and the first or second plate are joined, the side wall in the tube axial direction is joined. It was made to join, applying a load.

Further, in the method of manufacturing the cathode ray tube, when the side wall and the first or second plate are joined, the side wall is attached to the side wall in the tube axial direction by the load means having a flat surface similar to those of the first or second plate. It was made to join, applying a load.

Further, in the method of manufacturing the cathode ray tube, when the side wall and the first or second plate are joined, the side wall has the same flat surface as the first or second plate and an opening is formed in this flat surface. The load means was applied to the side wall while applying a load in the axial direction of the pipe.

Furthermore, a substantially rectangular flat first plate, a side wall that is joined to the peripheral edge of the first plate and extends substantially vertically, and a side wall that is joined to the side wall and faces the first plate in parallel. A vacuum envelope having a flat second plate is provided, and a support body that supports the first and second plates is arranged between the first and second plates, and the length of the support body in the tube axis direction is the side wall. In the method of manufacturing a cathode ray tube having a length longer than the length in the tube axis direction, when joining the side wall and the first or second plate, between the load means having a flat surface similar to that of the first or second plate and the side wall. The spacers were inserted so that the side wall was joined by the load means while applying a load in the axial direction of the pipe.

Further, in the method of manufacturing the cathode ray tube, when the side wall and the first or second plate are joined, the side wall has a flat surface similar to that of the first or second plate, and an opening is formed in this flat surface. A spacer is inserted between the applied load means and the side wall, and the load means is applied to the side wall while applying a load in the pipe axial direction.

[0029]

When the length of the support body supporting the first and second plates in the tube axis direction is longer than the length of the side wall in the tube axis direction as in the cathode ray tube, the support body and the first and second plates are separated from each other. The cathode ray tube can be surely brought into contact with each other and has sufficient pressure resistance against the atmospheric pressure load applied to the vacuum envelope.

Also, a substantially rectangular flat first plate,
A vacuum envelope having a side wall joined to a peripheral portion of the first plate and extending substantially vertically, and a flat second plate joined to the side wall and facing parallel to the first plate; In a method of manufacturing a cathode ray tube in which a support body for supporting the first and second plates is arranged between the first and second plates, when the side wall and the first or second plate are joined, the side wall in the tube axial direction is joined. When joining is performed while applying a load, even if the temperature distribution becomes somewhat uneven during heating and joining, the height of the side wall can be made constant by the pressure applied by the load.

When the side wall and the first or second plate are joined together, the side wall is joined by applying a load in the pipe axial direction to the side wall by a load means having a flat surface similar to that of the first or second plate. If it consists of multiple sidewall pieces,
The height of each of the side wall pieces can be the same.

When the side wall and the first or second plate are joined, the side wall is attached to the side wall by a load means having a flat surface similar to those of the first or second plate and having an opening formed in the flat surface. When joining while applying a load in the pipe axis direction, the temperature distribution inside the objects to be joined can be improved, and in combination with the pressure action due to the load, the height of the side wall can be made more reliable. You can

Further, particularly in the method of manufacturing a cathode ray tube in which the length of the support in the tube axis direction is longer than the length of the side wall in the tube axis direction, when the side wall and the first or second plate are joined, the first or second When a spacer is inserted between the load means having a flat surface similar to that of the second plate and the side wall and the load means joins the side wall while applying a load in the pipe axis direction, the length of the support in the pipe axis direction is reduced. Even if the side wall is longer than the length in the tube axis direction, a load can be applied to the side wall to make the height of the side wall constant. Further, it is possible to prevent the load means from being lifted by the support body due to the difference in thermal expansion between the side wall and the support body, and making the pressurization of the side wall unstable.

Furthermore, in the method of manufacturing a cathode ray tube in which the length of the support in the tube axis direction is longer than the length of the side wall in the tube axis direction, when the side wall and the first or second plate are joined, the first or second plate is formed. A spacer is inserted between the side wall and a load means having a flat surface similar to that of the second plate, and an opening is formed in this flat surface, and the load means joins the side wall while applying a load in the pipe axial direction. Then, the temperature distribution inside the objects to be welded can be improved, and in combination with the pressurizing action due to the load, the length of the support in the pipe axis direction is longer than the length of the side wall in the pipe axis direction. Also, it is possible to more reliably make the height of the side wall constant. Further, it is possible to prevent the load means from being lifted by the support body due to the difference in thermal expansion between the side wall and the support body, and the pressure on the side wall becoming unstable.

[0035]

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

FIG. 1 is an overall view of a cathode ray tube as an embodiment of the present invention, FIGS. 2 (a) and 2 (b) are sectional views taken along lines AA and BB, respectively, and FIG. 3 is an exploded view of the cathode ray tube. Indicate. The cathode ray tube is joined to a substantially rectangular flat glass face plate 1 (first plate) and a peripheral edge of the face plate 1 with a bonding material such as frit glass, and is substantially bonded to the face plate 1. A vertically extending glass side wall 2 and a substantially rectangular flat glass rear plate 3 (the first and second glass plates) which face the face plate 1 through the side wall 2 and are parallel to each other and are joined by a joining material such as frit glass. 2 plate) and a plurality of glass funnels 4 joined to the rear plate 3 by a joining material such as frit glass. The plurality of funnels 4 are joined around the plurality of openings 6 formed in the rear plate 3, respectively.

A phosphor screen 8 is formed on the inner surface of the face plate 1. On the other hand, an electron gun 10 is provided in each neck 9 of the plurality of funnels 4. Face plate 1 and rear plate 3
A plurality of rod-shaped support bodies 11 are provided between and.

In this cathode ray tube, each electron gun 1 described above is used.
The electron beam emitted from 0 is deflected in the horizontal and vertical directions by a magnetic field generated by a deflecting device (not shown) mounted outside each funnel 4, and the phosphor screen 8 is divided into a plurality of regions R1 to R1. Divide into R20 and scan. The screens drawn on the phosphor screen 8 by this divided scanning are connected by a signal applied to the electron gun 10 and the deflecting device, and have a structure in which one large image without discontinuity is reproduced on the entire surface of the phosphor screen 8. There is.

The support 11 is for supporting an atmospheric pressure load applied to the face plate 1 and the rear plate 3 of the vacuum envelope 5, and as shown in FIG.
As shown in FIG. 5, the tip portion 12 (the end portion on the phosphor screen 8 side) is formed into a wedge shape, and the tip portion 12 is divided into a plurality of regions R1 to R20 of the phosphor screen 8 which are divided and scanned by the electron beam. The base end portion 14 is fixed to the rear plate 3 so as to be located on each of the intersections 13.

Moreover, in a preferred example of this cathode ray tube,
The length of the support body 11 in the tube axis direction is formed longer than the height of the side wall 2 (length in the tube axis direction).

This is because, for example, when the face plate 1 is a flat rectangular 20-inch cathode ray tube having a substantially rectangular shape, an atmospheric pressure load of 1 ton or more is applied to the face plate 1, so that the atmospheric pressure load is supported by a plurality of supports. This is to form a safe cathode ray tube in which the face plate 1 is securely supported by all of the body 11 and is not cracked due to the deformation of the face plate 1 due to the atmospheric pressure load.

Next, several examples of the method of manufacturing the cathode ray tube will be described.

Manufacturing Method 1. In advance, a phosphor screen is formed on the inner surface of the face plate. In addition, a jig is used to position the support on the inner surface of the rear plate that corresponds to each intersection of the multiple areas of the phosphor screen that are divided and scanned by the electron beam, and the bonding material such as frit glass is heated and baked. Join and fix by binding. The electron guns are sealed in the necks of the funnels.

Next, using a jig or the like, the rear plate to which the support is fixed, the plurality of funnels enclosing the electron gun, and the plurality of side wall pieces constituting the side walls are positioned in a predetermined relationship. . Then, by applying a load to the side wall piece in the rear plate direction (pipe axis direction) by an arbitrary load means, the bonding material such as frit glass is heated and sintered, whereby the rear plate and the plurality of funnels, and the rear plate and the plurality of funnels. The side wall pieces are joined together to form a side wall. Next, the face plate on which the phosphor screen is formed is positioned and arranged on the side wall joined to the rear plate, and the joining material such as frit glass is heated and sintered to be joined. Then, the inside of the assembled envelope is exhausted.

By the way, when the rear plate and the plurality of side wall pieces are joined as described above, if the side wall pieces are heated and joined by applying a load in the direction of the rear plate by the arbitrary load means, the temperature distribution in the heating step is increased. Even if the thickness is somewhat uneven, the thickness of the bonding material layer becomes constant due to the pressure, and the height from the rear plate to the bonding surface of each side wall piece with the face plate can be made constant. As a result, conventionally, FIG.
As shown in FIG. 2, the side wall 2 is higher than the support body 11, a gap is formed between the face plate 1 and the support body 11, and when the vacuum envelope is formed, the face plate 1 is shown by a solid line due to an atmospheric pressure load. It is possible to prevent cracks caused by such deformation, and it is possible to manufacture a cathode ray tube having sufficient pressure resistance.

Manufacturing method 2. When manufacturing in the same process as the manufacturing method 1, as shown in FIG. 7, as a load means, a load means 15 having a flat surface similar to that of a face plate or a rear plate is used, and each side wall piece 16 is provided with a rear plate direction. While applying a load to the rear plate 3, the rear plate 3, the plurality of funnels and the plurality of side wall pieces 16 are integrally joined by heating and sintering the joining material such as frit glass.

In this way, if the load means 15 has a flat surface similar to that of the face plate or the rear plate, the load means 15 having a simple structure applies a uniform load to the plurality of side wall pieces 16 so that each of the side wall pieces 16 has a uniform load. The height of the side wall piece 16 can be made constant, and when a vacuum envelope is used as in the manufacturing method 1, it is possible to prevent cracks caused by deformation of the face plate, and it is possible to obtain sufficient resistance. It is possible to manufacture cathode ray tubes with atmospheric pressure strength.

Particularly, as shown in FIG. 7, an opening 17 is formed in the plate surface.
When the rear plate and the plurality of side wall pieces are joined by using the load means 15 formed with, the inside of the rear plate and the plurality of side wall pieces can be heated when the joining material is heated and sintered. The temperature distribution can be made uniform, and the height of each sidewall piece can be more reliably made uniform.

Manufacturing method 3. In particular, when a cathode ray tube in which the length of the support 11 is longer than the height of the side wall (length in the tube axis direction) is manufactured, as shown in FIG.
When using the support 11 which is ~ 3.0 mm long, the rear plate 3
When the side wall piece 16 is joined to the side wall piece 16 even if the side wall piece 16 is manufactured in the same process as in the manufacturing method 1 without applying a load in the direction of the rear plate 3, the difference between the length of the support 11 and the height of the side wall is not increased. The face plate can be bonded to the side wall such that all of the supports 11 contact the face plate without being affected.

Manufacturing method 4. As shown in FIG. 8, particularly in the case of manufacturing a cathode ray tube in which the length of the support is higher than the height of the side wall, as shown in FIG. 7, the load plate having a flat surface is used to form the rear plate on the side wall piece. Even if an attempt is made to apply a directional load, it is not possible to load the side wall piece because of the support. Therefore, in this case, as shown in FIG. 9, spacers 17 having a predetermined height are arranged on the side wall pieces 16 joined to the rear plate 3 so that the upper surfaces of these spacers are higher than the upper surface of the support 11. The load means 15 having a flat surface similar to that of the face plate or the rear plate 3 is arranged on the spacer 17, and the side wall piece 16 is bonded by applying a load in the direction of the rear plate 3.

When the height adjustable spacers 17 or the spacers 17 having a predetermined height are arranged in this way and the side walls are joined to the rear plate 3, even if the length of the support body 11 is higher than the height of the side wall pieces 16. The side walls can be joined so that they have a constant height.

Further, in this case, if the loading means having the openings is used, heating can be performed from the inside of the rear plate or the plurality of side wall pieces as in the case of the manufacturing method 2, and the temperature distribution at the time of joining is made uniform. Therefore, the height of each side wall piece can be more reliably made constant.

Further, as described above, the spacer 17 having a predetermined height
Even if the method of arranging and joining is applied especially when the length of the support is not higher than the height of the side wall, the load means is lifted by the support due to the difference in thermal expansion between the side wall and the support. Therefore, it is possible to prevent the pressurization of the side wall from becoming unstable.

In the manufacturing method of the above embodiment, the case where the rear plate and the side wall piece are first joined and then the face plate is joined to the side wall piece has been described.
The present invention can be applied to the case where the side wall piece is first joined to the face plate and then the rear plate is joined to the side wall piece, and the same effect can be obtained.

In the above embodiment, the case where the side wall is composed of a plurality of side wall pieces has been described.
It may be integrally molded from the beginning.

It is also applicable to the case where the side wall and the face plate or the rear plate are integrally molded in advance, the support is fixed to the integrally molded product, and then the rear plate or the face plate is joined.

Although the cathode ray tube having no color selection electrode has been described in the above embodiment, the present invention is applicable to a color picture tube in which a color selection electrode such as a shadow mask is arranged so as to face a phosphor screen. Can also be applied.

Further, the present invention can be applied even if a member having a thickness is interposed between the rear plate and the support. In this case, the length obtained by adding the length of the support and the thickness of the above member is the length required to support the atmospheric pressure load.

[0059]

The first plate having a substantially rectangular flat shape, the side wall extending substantially vertically from the peripheral edge of the first plate, and the substantially rectangular shape disposed through the side wall and facing in parallel to the first plate. A vacuum envelope having a flat second plate, a phosphor screen adhered to the inner surface of the first plate, and a second plate side, which divides the phosphor screen into a plurality of regions. Are arranged between a plurality of electron guns for scanning by scanning and the first and second plates.
In a cathode ray tube including a support that supports the second plate, if the length of the support in the tube axis direction is longer than the length of the side wall in the tube axis direction, the support and the first and second plates are surely brought into contact with each other. It is possible to provide a safe cathode ray tube having sufficient pressure resistance against the atmospheric pressure load applied to the vacuum envelope in which the first and second plates are flat.

In addition, a substantially rectangular flat first plate,
A vacuum envelope having a side wall joined to a peripheral portion of the first plate and extending substantially vertically, and a flat second plate joined to the side wall and facing in parallel to the first plate. In a method of manufacturing a cathode ray tube in which a support for supporting the first and second plates is arranged between the first and second plates, when the side wall and the first or second plate are joined, the side wall is in the tube axial direction. If the temperature distribution is slightly uneven during heating and joining,
A safe cathode wire having a sufficient pressure resistance against the atmospheric pressure load applied to the vacuum envelope by making the height of the side wall constant by applying pressure by the load to prevent the first or second plate from floating with respect to the support. The tube can be manufactured.

[Brief description of drawings]

FIG. 1 is a perspective view showing an overall configuration of a cathode ray tube which is an embodiment of the present invention.

2A is a sectional view taken along line AA of the cathode ray tube shown in FIG. 1, and FIG. 2B is a sectional view taken along line BB.

FIG. 3 is an exploded perspective view of the cathode ray tube.

FIG. 4 is a view showing a support for the cathode ray tube.

FIG. 5 is a diagram for explaining an arrangement position of a support.

FIG. 6 is a diagram for explaining a problem that occurs when the side wall is higher than the support.

FIG. 7 is a diagram for explaining a method of manufacturing a cathode ray tube, which is performed by using a load means having the same flat surface as a face plate or a rear plate.

FIG. 8 is a diagram for explaining a method of manufacturing a cathode ray tube in which the support is higher than the side wall.

FIG. 9 is a view for explaining a method of joining a cathode ray tube whose support is higher than the side wall while applying a load to the side wall piece via a spacer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Face plate 2 ... Side wall 3 ... Rear plate 4 ... Funnel 5 ... Vacuum envelope 8 ... Phosphor screen 10 ... Electron gun 11 ... Support 16 ... Loading means 17 ... Opening holes R1 to R20 ... Region

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yuji Haraguchi 1-9-2 Harara-cho, Fukaya-shi, Saitama Inside Fukaya Electronics Factory, Toshiba Corporation (72) Eiji Kamaba 1-chome, Harara-cho, Fukaya, Saitama No. 2 inside Toshiba Fukaya Electronics Factory

Claims (6)

[Claims] 1. A substantially rectangular flat first plate, a side wall extending substantially perpendicularly from a peripheral edge of the first plate, and a substantially parallel to the first plate disposed through the side wall and facing the first plate. A vacuum envelope having a rectangular flat second plate, a phosphor screen adhered to the inner surface of the first plate, and a phosphor screen disposed on the second plate side and having a plurality of phosphor screens. A cathode ray tube comprising a plurality of electron guns divided into regions for scanning and arranged between the first and second plates and supporting the first and second plates, wherein the support is a tube. A cathode ray tube, wherein the axial length is longer than the axial length of the side wall. 2. A substantially rectangular flat first plate, a side wall which is joined to a peripheral portion of the first plate and extends substantially vertically, and a side face which is joined to the side wall and is parallel to the first plate. A method for manufacturing a cathode ray tube, comprising: a vacuum envelope having a flat second plate, wherein a support for supporting the first and second plates is arranged between the first and second plates. A method of manufacturing a cathode ray tube, characterized in that, when the first or second plate is joined, the side wall is joined while applying a load in the tube axial direction. 3. A substantially rectangular flat first plate, a side wall which is joined to a peripheral portion of the first plate and extends substantially vertically, and a side face which is joined to the side wall and is parallel to the first plate. A method for manufacturing a cathode ray tube, comprising: a vacuum envelope having a flat second plate, wherein a support for supporting the first and second plates is arranged between the first and second plates. A cathode ray tube, characterized in that, when the first or second plate is joined, it is joined by applying a load to the side wall in the tube axial direction by a load means having a flat surface similar to those of the first or second plate. Manufacturing method. 4. A substantially rectangular flat first plate, a side wall which is joined to a peripheral portion of the first plate and extends substantially vertically, and a side face which is joined to the side wall and is parallel to the first plate. A method for manufacturing a cathode ray tube, comprising: a vacuum envelope having a flat second plate, wherein a support for supporting the first and second plates is arranged between the first and second plates. When joining the first or second plate, a load means having a flat surface similar to those of the first or second plate and having an opening formed in the flat surface is used to load the side wall in the pipe axial direction. A method of manufacturing a cathode ray tube, which comprises bonding while adding. 5. A substantially rectangular flat first plate, a side wall which is joined to a peripheral portion of the first plate and extends substantially vertically, and a side face which is joined to the side wall and is parallel to the first plate. A vacuum envelope having a flat second plate, and a support body for supporting the first and second plates is arranged between the first and second plates, and the length of the support body in the tube axis direction is In the method of manufacturing a cathode ray tube, wherein the side wall is longer than the length in the tube axis direction, when the side wall and the first or second plate are joined, a loading means having a flat surface similar to that of the first or second plate. A method of manufacturing a cathode ray tube, characterized in that a spacer is inserted between the side wall and the side wall, and the side wall and the side wall are joined by applying a load to the side wall by the load means. 6. A substantially rectangular flat first plate, a side wall joined to a peripheral portion of the first plate and extending substantially vertically, and a side wall joined to the side wall and facing in parallel to the first plate. A vacuum envelope having a flat second plate, and a support body for supporting the first and second plates is arranged between the first and second plates, and the length of the support body in the tube axis direction is In a method of manufacturing a cathode ray tube having a length longer than the length of the side wall in the tube axis direction, the side wall and the first or second plate have the same flat surface as that of the first or second plate when they are joined. A cathode ray tube, characterized in that a spacer is inserted between a load means having an opening formed on a flat surface and the side wall, and the load means joins the side wall while applying a load in the axial direction of the tube. Method.