JPS60109149A - Picture display device - Google Patents

Abstract

PURPOSE:To obtain a vacuum envelope having no leakage while improving the adhesion strength by a method, in which plural through holes are provided on the adhesion part of a rear substrate while sandwiching the rear substrate between the container side wall and an insulator or a metal body for being sealed. CONSTITUTION:The rear substrate is provided with plural through holes 5 so as to overlap the container side wall along the rear substrate periphery. Said rear substrate 1 is given high dew point hydrogen furnace treatment for heightening the properties of sticking to the low melting point soldering glass 2 while selectively forming a chrome film oxide of about one micron on a 42-6 alloy surface. Said rear substrate 1 is sandwiched by the container side wall 3 made of soft glass and a plate 4 also made of soft glass for being sealed through low melting point soldering glass 2.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an image display device having a vacuum envelope.

Structure of the conventional example and its problems The conventional flat panel image display device shown in Fig. 1 utilizes thermionic emission. It has a configuration in which two electrode groups accelerate and deflect light to emit light from desired pixels on two image display surfaces. As shown in the figure, the surface of the container facing the image display surface is formed of a metal plate, and is maintained in a vacuum. 1 in Fig. 1 is the rear substrate facing the image display surface;
It is formed of an ijT Ma metal with a thickness of I In to 2 mm, and its edge is sealed via a sealing member 2 to a side wall 3 of the container made of an insulating material. Then, by evacuating the container, at atmospheric pressure, L? The structure is such that the planar substrate 1 is deformed and the built-in electrode structure is fixed.

However, in the case of a container with such a configuration, when the air is evacuated, stress is generated at the sealing interface between the side (portion 3) and the back substrate 1 made of a metal plate, causing the back substrate 1 to peel off from the sealing member 2. However, there are cases where leaks occur and the vacuum cannot be maintained.3.
In order to solve the above-mentioned problems, there is a method of increasing the thickness of the side wall 3 to increase the adhesive area with the back substrate 1 and improve the adhesive strength, but in order to make the side wall 3 thicker, However, there are disadvantages such as an increase in the weight of the device.

OBJECTS OF THE INVENTION The object of the present invention is to improve the adhesive strength between the side wall of the container and the metal plate serving as the rear substrate, and to obtain a leak-free vacuum envelope.

Structure of the Invention In the present invention, in order to increase the adhesive strength between the back substrate made of a metal plate and the side wall of the container, a plurality of through holes are provided in the adhesive part of the back substrate, and the back substrate is connected to the side wall of the container. Use insulating weight or metal objects to sandwich and seal! Take the time.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings. Second
The figure shows part of the container. The display side of the container and
The container side wall 3td2 and the soft material of the cathode ray tube Ill are made of glass, and the coefficient of thermal expansion from room temperature to 450°C is 100.
．． It is 6X10. ``Container'' -, 1 construction started 4゛,゛,
1, the matching of the thermal expansion coefficients of the materials used cannot be ignored. Therefore, the back substrate 1 does not exhibit the same thermal expansion behavior as soft glass.
2-6 alloy (42% Ni + 6% Cr, Fe
52%); thermal expansion coefficient of 94 to 102
X10' low melting solder glass (working temperature is approx. 460℃)
℃) was used to reduce the residual stress during sealing, which attempts to match the coefficient of thermal expansion. In this example,
An 18 inch container was used.

The rear substrate 1 was a metal plate having a thickness of 0.2 mm and a size smaller than the circumference of the container by about 2 mm in length and width.

In addition, this rear substrate 1 has a diameter of 1 diameter and 2 diameters as shown in FIG.
The back En is so that the through hole 5 of mm
f), l: Provided at a pitch of 4 mm along the outer periphery of the plate. After going through the above steps, this rear substrate 1 is heated with high dew point water (low melting side) to improve the adhesion with the glass 2.
After zeta furnace treatment, 1 mic 1:, on the surface of 42-6 alloy.
An oxide film of about 17% Cr (Cr203) was selectively oxidized using a stone tool. Then, the back substrate 1 made of 42-6 alloy is attached to the side wall of the container made of soft glass, or I:1.
Sealing was performed at 450° C. for 1 hour using a plate 4 made of soft glass with a low-melting solder glass interposed therebetween. This plate 4 has the same width as the container side wall 3 and a thickness of 1
It is made of 0.1m soft glass, and one or more sheets form a frame along the outer periphery of the container.

As a result of configuring the container as described above, the adhesive strength between the back substrate 1 and the side wall 3 of the container is significantly higher than that of a conventional container that is not reinforced with the plate 4. 1 will no longer be separated by μm11 from the side wall 3 of the container,
The container is now 1° free from leakage. Initially, the thickness of the side wall 3 of the container was C110 mm.

However, when using this method, the thickness of the side wall of the container should be reduced to 7
It is possible to obtain the same effect even if it is made in mm, and it is possible to reduce the weight of the container by about 10%.

Other examples are shown below. In Figure 2: l:, board 4
was soft glass in the previous example, but in history Φr111
The thickness is 0.2m1. 42-6 alloy once a month and finished 31st. In this case as well, as in the previous example, there is a rupture I between the rear substrate 1 and the side wall 30 of the container.
LtJ: Not occurred. Also on board 4, the two fruits shown
T! In example i, a single board was used, but even if the board is divided to form the same shape and the board is used for sealing, the same effect can be obtained.
! I was able to do something. Temporary material 4 can be made of metal or insulating material, as mentioned above, as long as the matching of the thermal expansion coefficient is taken into consideration.As shown in FIG.
Just by applying and sealing a low-6 melting glass, the adhesive strength between the rear substrate 1 and the container side wall 3 can be improved, making it possible to
The back substrate 1 did not peel off due to air. .

Effects of the Invention As described above, the present invention sandwiches the rear substrate between the side wall of the container and a plate made of an insulator or metal in a sandwich manner, and seals the rear substrate via the sealing member 7a. By providing a plurality of through-holes in the container, the strength of the bonded skin and, ultimately, of the container is improved.
Accordingly, the yield rate of image display device manufacturing, I-
1 and its quality improvement. Furthermore, by improving the adhesive strength, it has become possible to reduce the inner thickness of the side wall of the container and make it lighter.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a part of a container of a conventional image display device, FIGS. 2 and 4 are sectional views showing a υ part of an 1lIIIi image device according to an embodiment of the present invention, and FIG. 3 is a sectional view showing the same device. FIG. . 1...--Back board, 2...Sealing part, 3...-
Side wall, 4... board, 5... through hole in the cup. Representative IM So (Name: Patent Attorney Toshio Nakao

Claims (1)

[Claims] An open part of a container made of an insulating material with one end open is sealed with a metal plate, and the metal plate is connected to the side wall of the container by a plurality of insulating materials or plates made of metal. 11. The metal plate is sandwiched between the container side wall of the metal plate and the plate. Make sure that the part has multiple through holes! An image display device with 11 signs.