JPH04212237A - Vacuum container for flat display - Google Patents

Abstract

PURPOSE:To construct a vacuum container for flat display use which has adequate strength to implosion and at the same time can be made thinner and lighter. CONSTITUTION:The front edge of a side periphery portion 2 is bent to form a panel periphery reinforcement portion 2a. A front panel 1 is jointed with the panel periphery reinforcement portion 2a. The side periphery portion 2 and a back portion 4 are formed of a metallic member in one body, respectively.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat display vacuum container in which an image is displayed on the front panel.

0002

2. Description of the Related Art Hitherto, so-called cathode ray tubes (CRTs) have been the mainstream vacuum container for displays that display images. However, this CRT
There was a problem in that the deep part was bulky and required a certain amount of space for its arrangement. In order to solve this problem, recently, with the development of semiconductor technology, image display devices called so-called flat displays have been actively developed, and some of them are commercially available. As vacuum containers used in such flat displays, for example, plasma display panels (PDP) and fluorescent display tubes (VFD) are known.

FIG. 9 shows a cross section of a vacuum container used in a conventional flat display. In the figure, the vacuum container has a front panel (100) made of glass material that displays an image, and a front panel (100) that displays an image.
It is composed of a back part (102) made of a glass material and arranged to face each other, and a side peripheral part (103) provided around the area between the back part (102) and the display panel (100). . In other words, all members of the vacuum container were made of glass.

[0004] An electrode section (101) is arranged inside the vacuum container. Specifically, it is arranged on the vacuum side surface of the back section (102). This electrode section (101) irradiates an electron beam onto a screen (104) made of fluorescent material or the like formed on the vacuum side of the display panel (100).
It projects images. Specifically, this electrode part (
101) is composed of, for example, an electron beam generation section, an electron beam focusing section, an electron beam deflection section, and the like.

By the way, in a vacuum container made of such a glass material, if there are microbubbles inside the glass material, or if there are defects such as scratches on the surface of the glass material due to an external action, this may be the cause. This causes the vacuum container to self-destruct, a so-called "implosion." In other words, implosion is a phenomenon in which when a part of a vacuum container has a weak point, stress is concentrated there and the vacuum container is crushed by atmospheric pressure. At this time, the glass fragments generated by the destruction are temporarily sucked into the vacuum container, but immediately after that, due to the reaction, they are scattered to the outside world with considerable energy (this is called delayed destruction), and as a result, the display This creates a situation where the glass shards fly towards the viewer.

[0006] Conventional vacuum containers for flat displays have been designed with sufficient margin for this implosion. In other words, the thickness of the glass material was set so as to have enough margin for the fracture resistance of the glass to be 5 to 7 times greater than the stress applied to the vacuum container.

[0007]

However, when the glass material is made thicker, the flat display itself becomes larger and its weight increases.

[0008] In other words, because such conventional vacuum containers for flat displays were made to have sufficient strength against implosion, the characteristics of thinness and light weight, which were originally an advantage of flat displays, were lost. .

On the other hand, in order to reduce the weight of the vacuum container and reduce the risk of implosion, a reinforcing plate 105 made of a transparent acrylic plate or the like is installed in front of the front panel (100), as shown in FIG. However, in this case, the thickness of the flat display would increase and it would be difficult to achieve the desired weight reduction.

The present invention has been made in view of the above-mentioned conventional problems, and its purpose is to provide a flat display that has sufficient strength against implosion and can be made sufficiently thin and lightweight. Our goal is to provide vacuum containers.

[0011]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a front panel on which an image is projected, a side peripheral plate whose front edge is joined to the front panel, and a rear edge of the side peripheral plate. a back plate bonded to a flat display vacuum container, the side peripheral plate being made of a metal member, a front edge of which is bent inward to form a panel periphery reinforcement portion, and the front panel is It is characterized in that it is joined to the panel periphery reinforcement part.

Further, the present invention is characterized in that the side peripheral plates and the back plate are integrally formed of a metal member.

Furthermore, the present invention is characterized in that the back plate is made of a ceramic member.

[0014]

[Operation] First, the stress state in a vacuum container for a flat display, which is the premise of the present invention, will be explained.

FIG. 11 shows a modified state of a general vacuum container (1) for flat displays. In addition,
In the figure, the solid line schematically shows the central cross section of the vacuum container, and the broken line exaggerates the deformed state of the vacuum container.

As shown in FIG. 11, the front panel (1) and the back part (3) are deformed inwardly in the vicinity of their centers, while the side peripheral parts (2) are deformed inwardly. , deformed in the direction of expanding outward.

FIG. 12 shows the state of stress generated in the vacuum container in response to the deformation of the vacuum container shown in FIG. Here, this stress distribution (indicated by a broken line) shows the stress distribution on the surface of the glass member. In reality, it is also necessary to consider the stress that occurs on the back side of the glass material (vacuum side), but when considering implosion, defects that occur on the surface of the glass are considered to be the main cause, so this explanation will not be sufficient. Consider the stress on the glass surface.

In FIG. 12, the broken line outside the vacuum vessel shown as a solid line indicates tension (tensile force). Moreover, the broken line inside the solid line indicates compression (compressive force). What should be kept in mind here is that
The fracture caused by tension and compression in glass is that the fracture caused by tension is about 10 times greater than that caused by compression. Therefore, from a structural perspective, parts that are under tension should be particularly careful.In other words, if you focus on strengthening the parts that are under tension, you can reduce the thickness of other parts and create a vacuum. The overall weight of the container can be reduced.

As described above, the present invention aims to reduce the weight and thickness of the vacuum container as a whole by considering the stress distribution of the vacuum container and focusing on strengthening its structurally weak parts. It is.

Under such a premise, the above configuration according to the present invention makes it possible to obtain the following effects. In other words, in the invention according to claim 1, the side peripheral plate is made of metal, and the front edge portion thereof forms the panel peripheral reinforcement part, so the reinforcement shown in FIG. 12 is most necessary. It is possible to effectively reinforce the parts and thus completely prevent implosion of the display. At the same time, since the side surrounding plate itself is composed of metal members, even if implosion occurs, the metal members will retain their original shape, so the amount of glass fragments and scattering energy caused by implosion will be reduced as much as possible. It becomes possible to suppress this. In other words, in the past, when an implosion occurred, glass fragments were generated due to the destruction of the side peripheral parts, but according to the present invention, it is possible to completely eliminate such glass fragments.

Further, by integrally constructing the side peripheral plates and the back plate from a metal member, the following advantages can be obtained. In other words, the thickness of the flat display can be reduced, and even if an implosion occurs, glass fragments caused by the destruction of the back plate can be completely eliminated. In particular, by configuring everything other than the front panel with metal members, it is possible to construct the area other than the area where the image is projected with sufficient strength, compared to a vacuum container that is made entirely of glass members. , it becomes possible to reduce the weight and thickness and improve implosion resistance.

Alternatively, by constructing the back plate from a ceramic member, it becomes possible to arrange, for example, an electrode portion for generating an electron beam directly on the back plate without using any insulating plate.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a vacuum container for a flat display according to a first embodiment. This vacuum container is composed of a front panel (1) on which an image is projected, side peripheral parts (2), and a back part (4). Here, the front panel (1) is made of a transparent glass member as in the conventional example, and specifically, its thickness is 6 mm, and the front panel (1) is made of glass that meets the Japan Electronics Industry Association standard H8602 as in the conventional example. material is used. In addition, the side peripheral part (2) and the back part (4)
is integrally constructed of a metal member, specifically, the metal member is SUS410 with a thickness of 2 mm.
(13Cr-Fe) is used. The diagonal size of this vacuum container has a screen size of 340 mm.
It is mm. Note that for any of the numerical values, there is no problem in using other values.

A screen (6) is formed inside the front panel (1). Moreover, an electrode part (5) for irradiating an electron beam is arranged inside the back part (4). Note that since the back surface portion (4) is made of a metal member, an insulating plate or the like is required between the electrode portion (5) and the back surface portion (4), but this is not shown.

The front edge of the side peripheral portion (2) is bent inward (in the direction of the panel surface) to form a panel peripheral reinforcing portion (2a). In other words, as shown in FIG. 12, the area around the panel is a tension area, and stress is concentrated here, so that area is reinforced. Front panel (1)
is bonded to this panel periphery reinforcing portion (2) with, for example, frit glass, which is solder glass.

[0027] In this embodiment, the side peripheral portion (2
) consists of a panel periphery reinforcement part (2a) which is the front edge thereof, and a side part (2c) connected thereto, and the two are integrated by brazing or welding during manufacturing. This also applies to the relationship between the side circumferential portion (2) and the back surface portion (4). In either case, the front panel (
By integrally configuring the components other than 1) with metal members, an extremely lightweight and thin vacuum container for a flat display can be constructed.

On the outside of the front panel (1), for example, 20
A glass coating (7) with a thickness of approximately μm is applied to protect the glass surface from external effects and to suppress the scattering of glass fragments in the event of an implosion.

[0029] According to the above structure, as described above, since the parts with extremely high tension are made of metal members, the structure is extremely resistant to implosion. As a result, the vacuum container for the flat display can be made thinner, and the vacuum container can also be made lighter. This will be explained specifically. First, when the side surroundings are made of metal, the stress σ that leads to its destruction is 1
It is about 5Kgf/mm2. On the other hand, when the vacuum container is made of glass, σ is usually about 4 to 5 Kgf/
mm2, but in consideration of the above-mentioned delayed fracture and defects, it is actually necessary to design with a maximum stress value of about 0.7 to 0.8 Kgf/mm2.

Comparing the two under these assumptions, we find that
Conventionally, the thickness of the glass needs to be about 10 mm, but in this embodiment, by using a metal member, it is possible to construct the glass with a thickness of about 2 mm. Therefore, it is understood that the thickness of the vacuum container for flat displays can be made extremely thin.

[0031] Furthermore, the density of glass is approximately 2.5 g/cm
3, and on the other hand, the density of the metal member is, for example, 7.8 g/
cm3, it is understood that according to this example, the weight of the vacuum container can be significantly reduced.

[0032] Furthermore, if implosion occurs,
Glass fragments caused by the destruction of the front panel were found around the side (
2) and the back part (4), and then it is reflected and flies forward, but in this case, most of the energy can be absorbed by the metal member, so it is further scattered by the inner surface of the panel peripheral reinforcement part (2a). This has the effect of significantly reducing the amount and energy of glass fragments flying forward.

Next, a second embodiment will be explained using FIG. 2. In addition, in other embodiments and each embodiment described below, members similar to those shown in the first embodiment are given the same reference numerals, and explanation thereof will be omitted.

In the first embodiment, the front panel (1)
However, in this second embodiment, the front panel (1) is joined to the outside of the panel perimeter reinforcement part (2a). shall be. With such a configuration, it is also possible to obtain the same effects as described above. Note that the electrode portion (5) and the like are omitted in the figure.

Next, FIG. 3 shows a third embodiment. A feature of this third embodiment is that the back surface is made of an insulating ceramic member (3). According to such a configuration, the electrode part (5)
There is an advantage that an insulating material or the like interposed between the electrode portion and the back surface portion can be eliminated, and the electrode portion (5) can be placed directly on the back surface portion.

Furthermore, since the insulating member (3) is made of a ceramic member that has a higher tensile strength than glass, in the event of an implosion, the glass fragments generated by the destruction of the front panel (1) will be removed from the ceramic material. Member (3) enables sufficient absorption. In addition, the side surrounding area (
2) considers matching with ceramic member (3),
It is also suitable to use two types of materials. In this example, the ceramic member (3) has a thickness of about 8 mm.

Next, FIG. 4 shows a fourth embodiment. This fourth embodiment is characterized in that the rear edge of the side peripheral part (2) is bent inward to form a back peripheral part (2b). According to such a configuration, the back surface made of the ceramic member (3) can be held securely, and
It becomes possible to increase the rigidity of the vacuum container. In this fourth embodiment, a ceramic member (3) is bonded and arranged on the inner surface of the rear peripheral portion (2b). As shown in the figure, in this embodiment, the side peripheral portion (2) is formed into a U-shape in cross section. In this embodiment and each embodiment described below, the electrode portion (5) and the like are omitted from the drawings.

Next, FIG. 5 shows a fifth embodiment. This embodiment is characterized in that the ceramic member (3) constituting the back surface is disposed outside the peripheral surface of the back surface (2b).

FIG. 6 shows a sixth embodiment. In this embodiment, similarly to the fourth embodiment, the ceramic member (3) constituting the back surface is bonded to the inside of the rear peripheral section (2b), and similarly to the second embodiment, the The panel 1 is characterized in that it is joined to the outside of the panel periphery reinforcement part (2a). This is, so to speak, a composite type of each of the above embodiments.

FIG. 7 shows a seventh embodiment. This embodiment is characterized in that the front panel (1) is formed into a gentle convex shape with its central portion slightly protruding forward. In accordance with this shape, the panel peripheral reinforcement portion (2a) is also formed with a slight curvature.

FIG. 8 also shows a front panel (1) formed in a gentle convex shape, similar to the seventh embodiment shown in FIG. The difference from the seventh embodiment is that the front panel (1) is disposed inside the panel periphery reinforcement part (2a). By providing the front panel (1) with a gentle curvature as shown in FIGS. 1)
It becomes possible to reduce the thickness of the Of course, it may be formed in a concave shape depending on the case.

As described above, in each of the embodiments, the side peripheral portion (2) is made of a metal member, and the front edge thereof is bent to form the panel peripheral reinforcing portion (2a), thereby reducing stress. It is possible to construct a vacuum container for a flat display that is resistant to implosion by reliably reinforcing the surrounding area of the front panel where the front panel is concentrated. Further, such a configuration has the effect that the vacuum container itself can be made thinner and lighter. Furthermore, such an effect can be further enhanced by integrally forming the side peripheral portion and the back surface portion with a metal member. Note that it is also preferable to coat the outer periphery of the metal member with an insulating film or the like to prevent rust.

[0043]

As explained above, according to the vacuum container for a flat display according to the present invention, the side peripheral plate is made of a metal member, and the front edge thereof constitutes the panel peripheral reinforcement part, so that the vacuum container is The container can be made thinner and lighter. Also in this case, it is possible to maintain sufficient strength against implosion.

[0044] By integrally forming the side peripheral plates and the back plate with a metal member, it is possible to further enhance the above-mentioned effects.

Further, by using a ceramic member as the back plate, there is an effect that, for example, an insulating member required between the electrode section and the back plate can be eliminated.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a first embodiment of a vacuum container for a flat display according to the present invention.

FIG. 2 is a sectional view showing a second embodiment of the vacuum container for flat displays according to the present invention.

FIG. 3 is a sectional view showing a third embodiment of the vacuum device for flat displays according to the present invention.

FIG. 4 is a sectional view showing a fourth embodiment of the vacuum container for flat displays according to the present invention.

FIG. 5 is a sectional view showing a fifth embodiment of the vacuum container for flat displays according to the present invention.

FIG. 6 is a sectional view showing a sixth embodiment of the vacuum device for flat displays according to the present invention.

FIG. 7 is a sectional view showing a seventh embodiment of the vacuum container for flat displays according to the present invention.

FIG. 8 is a sectional view showing an eighth embodiment of the vacuum device for flat displays according to the present invention.

FIG. 9 is a sectional view of a conventional vacuum container for a flat display.

FIG. 10 is a sectional view of a conventional vacuum container for a flat display equipped with a front reinforcement plate.

FIG. 11 is an explanatory diagram showing a deformed state of a vacuum container for a flat display.

FIG. 12 is an explanatory diagram showing the stress distribution of a vacuum container for a flat display.

[Explanation of symbols]

1 Front panel 2 Side surrounding area 2a　Panel surrounding reinforcement part 3 Ceramic components 4 Back part

Claims (3)

[Claims] 1. A vacuum container for a flat display, comprising: a front panel on which an image is projected; a side peripheral plate having a front edge joined to the front panel; and a back plate joined to a rear edge of the side peripheral plate. The flat display is characterized in that the side peripheral plate is made of a metal member, a front edge thereof is bent inward to form a panel peripheral reinforcement part, and the front panel is joined to the panel peripheral reinforcement part. vacuum container. 2. The vacuum container for a flat display according to claim 1, wherein the side peripheral plate and the back plate are integrally formed of a metal member. 3. The vacuum container for a flat display according to claim 1, wherein the back plate is made of a ceramic member.