JPH04160743A - Vacuum vessel for flat plate type display device - Google Patents

Abstract

PURPOSE:To make a vacuum vessel small in its outer shape and prevent its frit glass adhesion part from coming off by keeping an adhering face to flat glass plate of a jointing member away from a sealing face to an outer vessel CONSTITUTION:A jointing member 1 for a vacuum vessel for a flat plate display device is composed of its adhering face 3 to a flat glass plate 2, its sealing face 5 to an outer vessel 4, which face 5 is not on the same plane as the adhering face 3, and a connection part 1a, which connects the faces 3 and 5. As the adhering face 3 to a flat glass plate 2 of the jointing member 1 thus is not on the same plane as the sealing face 5 to the outer vessel 4, the sealing face 5 and the adhering face 3 can be kept away from each other to some extent so as not to give thermal effect to the vicinity of adhering part 3. This can avoid the expansion of the vacuum vessel shape and prevent the frit glass adhering part from coming off, and alleviate the stress acting on the adhering face 3.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a vacuum container for a flat panel display device using an electron beam.Prior art Vacuum containers for a flat panel display device have various shapes. However, demand for thinner and lighter products is increasing. That-
For example, the specification and drawings of U.S. Patent No. 3.882.355 disclose a configuration in which a flat glass plate and a dome-shaped metal container are bonded together at the flange of the metal container using frit glass or the like. In such a vacuum container configuration, in order to obtain sufficient safe strength against atmospheric pressure, the wall must be made thicker, which not only increases the weight but also increases the thermal stress generated during the manufacturing process. There is a problem that the flat glass may break.To solve this problem, the present inventors have developed a method to alleviate thermal stress during sealing and improve vacuum pressure resistance. We proposed a vacuum container for a flat panel display device, which is separated into an outer container and a pressure-resistant member installed inside the container to support atmospheric pressure, and is configured so that only the outer container is bonded to a flat glass. 1 is a sectional view of a conventional vacuum container for a flat panel display device proposed by the present inventors. In the figure, 21 is a flat glass container, 22 is a thin metal outer container, 23 is a pressure-resistant container placed on the flat glass 21, and 24 is a container for indirectly joining the flat glass 21 and the outer container 22. If the flat glass 21 is made of soda glass, the coefficient of thermal expansion will be approximately the same, for example 4.
2-6 alloy (42% Ni, 6% Cr, remaining Fe) 25 is an adhesive part using frit glass for joining the flat glass 21 and the joining member 24, and 26
The plate 27 is hermetically sealed by means such as laser welding, and the phosphor 28 coated on the flat glass 21 is a linear cathode mirror.
Reference numeral 29 represents a backside electric machine, and reference numeral 30 represents a control electrode.

The outer container 22 is made of a thin metal plate.Not only can the thermal stress generated in the thermal process in the manufacturing process of the vacuum container be reduced, but the rigidity of the outer container 22 is reduced, so that the overall thermal stress can be reduced. can. On the other hand, when the inside of the vacuum container is evacuated, the outer container 22 easily buckles due to atmospheric pressure, but since the pressure container 23 is provided inside the vacuum container, the shape of the metal container is maintained. Problems to be Solved by the Invention However, the above-mentioned conventional configuration had the following problems (1) The outer container and the joining member are melted and sealed together, but this sealing It is better to keep the sealing part of the joining member and the outer container as far away from each other as possible so as not to have a thermal effect on the vicinity of the joining part. If the bonded part to the glass is on the same plane, the bonded member will protrude from the flat glass, which not only increases the external size of the vacuum container, but also causes the frit glass to be caught and peeled off. (2) It is necessary to handle the vacuum container with care, such as storing it away.
When atmospheric pressure acts on the entire container, the areas where stress concentration is likely to occur are (a) contact between the pressure container and the flat glass, especially where the processing accuracy of the pressure container is poor and local contact occurs (b) bonding This is the case when the bonded part where the component and the flat glass are bonded, especially the thin-walled outer container and the bonded material, becomes deformed.

Therefore, since stress concentration occurs in these parts, the safety factor for vacuum pressure strength may decrease, making it difficult to obtain high reliability. In the 42-6 alloy used for parts, Cr is selectively oxidized in wet hydrogen to form an oxide film on the surface, and then the alloy is bonded to flat glass.

On the other hand, the other side of the joining member must be sealingly joined to the outer container (~ However, if the sealing is done using a method such as laser welding that locally heats and melts both, only this oxide film will not melt. , there is a risk that a weak oxide layer will form, cracks will occur in the melted area, and leakage may occur from that area.

Therefore, the high airtightness required to generate an electron beam cannot be obtained. An object of the present invention is to provide a highly reliable vacuum container for a flat panel display device that can maintain necessary high airtightness.

Means for Solving the Problems In order to achieve this object, a vacuum container ζ;L for a flat panel display device of the present invention (1) A flat glass, an outer container facing the flat glass, and an outer container for the flat display device. A vacuum container for a flat display device, which has a pressure-resistant container disposed inside and a bonding member bonded to the periphery of a flat glass, and the outer container and the flat glass are sealed and bonded using the bonding member. The bonding member has a configuration consisting of an adhesive surface with the flat glass, a sealing surface with the outer container that is not on the same plane as the adhesive surface, and a connecting portion between the adhesive surface and the sealing surface. (2) In addition to the configuration described in (1) above, the present invention has a configuration that includes means for preventing deformation of the joining member. Furthermore, especially for the purpose of maintaining high airtightness, (3) In addition to the configuration in (1), the bonding member has a structure in which the part with a coating that improves airtightness is bonded to the flat glass, and the part without the coating is fused and sealed to the outer container. .

Function: With this configuration, the bonding member can be used in a mold where the bonding surface with the flat glass and the sealing portion with the outer container are not on the same plane.
In addition, the connecting part allows the sealing part and the bonding surface to be separated to a certain extent so as not to have a thermal effect on the vicinity of the bonded part.8 Since the shape does not protrude from the flat glass, the external size of the vacuum container becomes large. There is no risk of the frit glass bonding part peeling off if it gets caught.Also, since it is equipped with a means to prevent deformation of the bonding member, when atmospheric pressure acts on the vacuum container, the bond between the flat glass and The stress acting on the adhesive surface is relaxed.

In addition, the joint member is bonded to the flat glass in the part with a coating that improves airtightness.The airtightness is maintained in this part, and the part without the coating is fused and sealed with the outer container. 8) It is possible to obtain a highly airtight sealed part without defects such as cracks in the molten part.Example 6 Below, an example of the present invention will be explained with reference to the drawings. The same parts as those of the conventional vacuum container for a flat panel display device are given the same reference numerals, and although the explanation is omitted, FIGS. FIG. 3 is an enlarged cross-sectional view of the vicinity of the joint with the outer container.

In the embodiment shown in FIG. 1, a bonding member 1 includes a bonding portion 3 that is bonded using a flat glass 2 and a frit glass 2a, and a sealing member that seals an outer container 4 that is not on the same plane as the bonding portion 3. The outer container 4, which is made up of a sealing portion 5 and a connecting portion 1a that connects the adhesive portion 3 and the sealing portion 5, is reinforced with a pressure-resistant container 6 provided along the inside thereof. With such a configuration, the adhesive part 3 with the flat glass 2 and the outer container 4
and the sealing part 5 are not on the same plane, and the connecting part 1
a allows the sealing part 5 and the adhesive part 3 to be separated to some extent so as not to have a thermal effect on the vicinity of the adhesive part 3.Since the joining member 1 does not have a shape that protrudes from the flat glass 2, The outer shape of the container will not increase in size, and there is no risk of it getting caught and peeling off the adhesive part 3. Points 1 where stress concentration tends to occur when atmospheric pressure acts on the entire container (a) Pressure resistant container 6 and flat glass 2
(b) the adhesive part 3 that adheres the bonding member 1 and the flat glass 2 (particularly when the thin-walled outer container 4 and Especially when the vacuum container is large, the amount of deformation of the bonding member 1 will also be large, and the stress acting on the bonded part 3 will not be fully alleviated, causing cracks to form in the bonded part 3. There is a risk of leakage from there. Therefore, it is necessary to prevent the joining member 1 from deforming by some means.

The second solution to this problem is shown in Figures 3 (a) and (b).
and the embodiment shown in FIG.

First, in the embodiment shown in FIG. 2, deformation of the joining member 1 can be prevented by structuring the flange portion 6a of the pressure vessel 6 to be in close contact with the connecting portion 1a of the joining member 1.

Further, FIG. 3(a) shows a case where the bonding member 1 is sandwiched and bonded between the flat glass 2 and the reinforcing member 7, and a buffer member 8 is interposed between the reinforcing member 7 and the pressure-resistant container 6. This is an example. This reinforcing member 7 is preferably a glass member made of the same material as the flat glass 2, or a metal column having approximately the same coefficient of thermal expansion as the flat glass 2 may be used, for example, a 42-6 alloy (°C). A through hole 1b is opened in the glass, and the reinforcing member 7 is connected to the frit glass 2a through the joining member 1.
Even if the reinforcing member 7 is bonded to the flat glass 2 by the adhesive part 3 using can also improve
However, if the pressure container 6 is placed directly on the reinforcing member 7, stress will be concentrated on the reinforcing member 7 when the vacuum container is brought into a vacuum state and atmospheric pressure is applied. Therefore, if the buffer member 8 is inserted between the pressure container 6 and the reinforcing member 7a, with such a structure, when the inside of the vacuum container is brought into a vacuum state, atmospheric pressure will act, and the pressing force from the pressure container 6 will be flat. This acts on the glass 2 via the buffer member 8, and the stress generated in the reinforcing member 7, the adhesive portion 3, or the flat glass 2 can be alleviated. Furthermore, the joining member 1 also tries to deform together with the thin-walled outer container 4, but since the connecting part 1a of the joining member 1 is in close contact with the side wall of the buffer member 8, it cannot deform (~ Also, Fig. 3(b) ) As shown in FIG. 4, the deformation of the joining member 1 can also be prevented by bringing the reinforcing member 7 and the connecting portion 1a of the joining member 1 into close contact with each other, and the same effect can be obtained. By filling the frit glass 2a between the bonding member 1 and the connecting portion 1a of the bonding member 1, deformation of the bonding member 1 can be prevented. Therefore, stress concentration will not occur in the bonding portion 3). .

By the way, when using 42-6 alloy for the bonding member 1, for example, in order to improve the airtightness with the flat glass 2, Cr is selectively oxidized in wet hydrogen to form an oxide film on the surface, and then the flat glass 2 and It is common to use it for adhesion of &
-4 The other side of the joining member 1 must be sealingly joined to the outer container 4. If the sealing is done by local heating such as laser welding and melting the two, only this oxide film will remain. There is a risk that a weak oxide layer will not be melted and cracks will occur in the sealing portion 5.

Although the solution to this problem is the embodiment shown in FIG. 5, in this embodiment, there is a sealing part 5 of the joining member 1 which is melted and sealingly joined to the outer container 4, and a part 1 without an oxide film in the vicinity thereof.
c. In this way, since the part with the oxide film that improves airtightness is bonded to the flat glass 2, the airtightness in this part is maintained, and the part 1c without the oxide film is melted and sealingly bonded to the outer container 4. It is possible to obtain a highly airtight sealed part 5 without defects such as cracks in the melted part.

According to the embodiment described above, similar to the vacuum container proposed by the present inventors, materials with a relatively large coefficient of thermal expansion can be used for the outer container 4 and the pressure container 6. Needless to say, it is possible to obtain a vacuum container.As described above, according to the present invention, the bonding member does not have a shape protruding from the flat glass, so that the external shape of the vacuum container can be reduced. The glass will not become large, and there is no risk of it getting caught and peeling off the frit glass bond.Also, if the inside of the vacuum container is made into a vacuum state after being hermetically sealed, atmospheric pressure will act on the entire container, along with the thin outer container. The bonding member also tends to deform, but since it is equipped with a means to prevent deformation of the bonding member, the stress that acts directly on the bonded part with the flat glass is alleviated. Airtightness is maintained because it is bonded to the flat glass in some areas, and the area without a coating is fused and sealed to the outer container, resulting in a highly airtight seal with no defects such as cracks in the molten area. Therefore, the present invention provides a highly reliable vacuum container for flat panel display devices, which improves the safety factor for vacuum pressure strength and maintains the high airtightness necessary for generating an electron beam. The industrial value is extremely high because it can be provided.

[Brief explanation of the drawing]

1 to 5 are enlarged cross-sectional views of the vicinity of the joint between the flat glass and the outer container of the vacuum container for a flat panel display device according to an embodiment of the present invention. FIG. 6 is a conventional vacuum container for a flat panel display device. FIG. 3 is a cross-sectional view of the container. 1... Joining member 1a... Connection star 3... Adhesive part (adhesive surface), 4... Outer container 5... Sealing part (sealing surface), 6... Pressure-resistant container agent Name: Patent attorney Akira Okaji and 2 others/-fI
宕 Member lcL' - Liao Tuna Iku 5 --- Sealing part p (sealing surface) 6-4ga Yong Tomoe Figure 1 Figure 2 Figure 4 Figure 2α

Claims (6)

[Claims] (1) It has flat glass, an outer container facing the flat glass, a pressure-resistant container disposed inside the outer container, and a bonding member adhered to the peripheral part of the flat glass. , a vacuum container for a flat display device in which the outer container and the flat glass are sealed and joined using the joining member, the joining member having an adhesive surface with the flat glass;
A vacuum container for a flat panel display device, comprising a sealing surface with the outer container that is not on the same plane as the adhesive surface, and a connecting portion between the adhesive surface and the sealing surface. (2) Claim 1 comprising means for preventing deformation of the joining member.
A vacuum container for a flat panel display device as described above. (3) The vacuum container for a flat panel display device according to claim 2, wherein the means for preventing deformation of the joining member is a part of the pressure container. (4) The means for preventing deformation of the bonding member includes sandwiching and bonding the bonding member between a flat glass plate and a reinforcing member, interposing a buffer member between the reinforcing member and the pressure-resistant container, and disposing the reinforcing member or The vacuum container for a flat panel display device according to claim 2, which is a part of the buffer member. (5) The means for preventing deformation of the bonding member includes sandwiching and bonding the bonding member between a flat glass plate and a reinforcing member, interposing a buffer member between the reinforcing member and the pressure-resistant container, and 3. The vacuum container for a flat panel display device according to claim 2, wherein the vacuum container is a low melting point glass filled between the connecting portion and the connecting portion. (6) It has flat glass, an outer container facing the flat glass, a pressure-resistant container disposed inside the outer container, and a bonding member adhered to the periphery of the flat glass. , the bonding member includes an adhesive surface to the flat glass, a sealing surface to the outer container that is not on the same plane as the adhesive surface, and a connecting portion between the adhesive surface and the sealing surface. ,
A vacuum container for a flat panel display device, which is bonded to a flat glass at a portion with a coating that improves airtightness, and melted and sealingly bonded to the outer container at a portion without the coating.