JPH01189841A - Vacuum container for image display device - Google Patents

Abstract

PURPOSE:To make a container lightweight by providing a molded body having a flat face section displaying an image and an elliptic skirt section with about 1/4 cross section shape continued to it. CONSTITUTION:A back panel 2 is sealed to a front panel 1 displaying an image and forming a vacuum container with frit 3 to form a vacuum container. The plate glass with the thickness of 5mm of the panel 1 is pinched with a window- shaped jig at the periphery and heated to 650-750 deg. to bulge the center section, it is then immersed in K fused salt for a long time to substitute the Na component with the K component for chemical reinforcement. An electrode structure body 4 is assembled at the preset position of the panel 1, the back panel 2 is overlapped, they are sealed with nonquality frit 3 to keep the inside of the vacuum container at 10<-6>-10<-7> Torr. Stress is generated on the outside surface of the panel 1 by this vacuuming, but the stress can be averaged by forming a circular or elliptic skirt section 7, the ratio between the long side and the short side of the elliptic shape is set to 4:3, a particularly large effect can be obtained by using the direction parallel with the face section as the short-side direction.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to a vacuum container used in a double-image display device.

2. Description of the Related Art Conventionally, as a vacuum container for an image display device, there has been known a vacuum container for an image display device which is made of a glass molded body having a trapezoidal cross-sectional shape and a skirt portion having an inclined plane. That is, as shown in FIG. 2, the vacuum container 20 includes a front panel 21, a back panel 22, a frit 23, a stud bin 24, an electrode structure 26, a support spring 26, a face portion 27, a corner portion 28, and a skirt portion 29. , flange part 30
By the way, the vacuum container 2o is made to have a degree of vacuum of 10-6 to 10-7) to emit an electron beam. As a result, vacuum distortion occurs on the outer surfaces of the front panel 21 and the pack panel 22 as shown in FIG.
The maximum tensile stress occurs at When a flaw occurs in the tensile stress portion, stress concentration occurs, and when the strength of the material is weakened by this stress, the flaw continues to elongate, eventually causing the vacuum vessel 20 to break. Therefore, the vacuum vessel 20, which has a trapezoidal cross-sectional shape, is made of glass with a thickness that is such that even if the skirt portion 29 is scratched and stress concentration occurs, the tensile stress can be suppressed to a level that does not exceed the strength of the material. ing. Therefore, there was a problem that the structure was inevitably heavy.

In view of the above conventional problems, the present invention provides a lightweight vacuum container for an image display device that can withstand a predetermined degree of vacuum without increasing the panel thickness. The technical means is characterized in that the cross-sectional shape of the skirt portion is approximately a quarter ellipse to even out the stress.

Function: In the vacuum container of the present invention, the shape of the skirt portion of the vacuum container is approximately a quarter ellipse as described above, so that the stress distribution in the skirt portion can be averaged and the stress level can be reduced. , the thickness of the panel can be reduced accordingly to reduce weight.

EXAMPLE Hereinafter, an example of the present invention will be described based on the accompanying drawings.

In FIG. 1, 1 is a front panel that displays an image and forms a vacuum container. 2 is a back panel that is sealed to the front panel 1 with a frit to form a vacuum container. 3 is a frit for bonding the front panel 1 and the back panel 2 together. Reference numeral 4 denotes an electrode structure composed of various electrodes and fluorescent materials for displaying images. 5 is a face portion of the front panel 1 which is an area for displaying an image; 6 is a corner portion of the front panel 1; 7 is a corner portion of the front panel 1;
8 is a skirt portion of the front panel 1, and 8 is a flange portion of the front panel 1. 9 is the electrode structure 6
This is a terminal that sends a signal to.

The thickness of the face portion 6 of the front panel 1 shown in FIG. 1 is approximately 6 mm, and the thickness of the skirt portion 7 is approximately 4.6 mm.
mm, and the plate thickness of the flange portion 8 is approximately 5 mm.

To make this front panel 1, the periphery of a 5 mm thick plate glass is sandwiched between a window frame-shaped jig and the temperature is approximately 65-7 degrees Celsius.
It is molded by heating it to a temperature of 50 degrees and making the center part stick out like a plate. It should be noted that since the projecting is done by utilizing the corner portions 6 rather than touching the central portion, the face portion 6 retains the flatness and roughness of the glass plate. Then, the front panel 1 is immersed in potassium molten salt heated to about 450 to 500 degrees Celsius for a long period of time to perform chemical strengthening by replacing the sodium and potassium components of the sheet glass.

Thereafter, the electrode structure 4 is assembled in a predetermined position on the front panel 1, and then the back panel 2 made by the same glass molding method is superimposed on the front panel 1, and placed in a furnace at about 460 degrees Celsius. It is sealed with an amorphous frit.

Next, the air inside the sealed vacuum container is removed to create a vacuum level of 10=-10-')-le.

When a vacuum is created, the vacuum container is compressed inward by the atmosphere, and a stress distribution as shown in Figure 4 occurs on the outer surface of the front panel 1 (calculation result using the finite element method when there is no chemically reinforced layer). The maximum tensile stress occurs in the skirt part A. In FIG. 4, the shape of the skirt portion 7 is an inclined planar shape,
Quarter circle shape and quarter ellipse shape (long side: short side = 4:
The stress distributions for the three cases in a) are shown overlappingly.

As can be seen from FIG. 4, the sloped planar skirt portion 29 as shown in the conventional example has two maximum values of tensile stress and also has a very high maximum tensile stress.

However, in the case of the skirt portion 7 having a circular shape or an elliptical shape, stress can be averaged with only one maximum value, and it can be seen that the effect is particularly large in the case of an elliptical shape.

The elliptical shape has a long side to short side ratio of 4:3, and the short side direction is parallel to the face surface.

The maximum stress generated in the elliptical skirt portion 7 is about 60 inches compared to the case where the skirt portion 7 has an inclined plane shape. Furthermore, since stress is inversely proportional to the square of the plate thickness, this reduction in stress is approximately 76% when converted to the plate thickness. That is, it can be seen that even if the plate thickness is -rs% in the trapezoidal shape, the stress is only at the same level in the elliptical shape. Therefore, the vacuum container made in this manner can have a thinner glass plate than a conventional vacuum container having a trapezoidal cross section, and can reduce the weight by about 25%.

Effects of the Invention According to the vacuum container for an image display device of the present invention, the weight of the vacuum container can be reduced by equalizing the stress distribution in the skirt portion of the panel, making it possible to create a light image display device that is easy to carry. There are great benefits of becoming one.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a vacuum vessel according to an embodiment of the present invention, Fig. 2 is a sectional view of a conventional vacuum vessel, Fig. 3 is a stress distribution diagram of a conventional vacuum vessel, and Fig. 4 is an embodiment of the present invention. FIG. 3 is a stress distribution diagram of the outer surface of the vacuum container of the example and the conventional example. 1... Front panel, 2... Temple hack panel, 4... Electrode structure, 6... Face part, 6... Corner part, 7... ...Skirt part, 8...Flange part. Name of agent: Patent attorney Toshio Nakao and one other person
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Claims (1)

[Claims] A vacuum container for an image display device, comprising a glass molded body having a flat face part for displaying an image and a skirt part connected to the flat face part and having a substantially quarter-elliptic cross-sectional shape.