JPH03216940A - Glass container for image display device - Google Patents

Abstract

PURPOSE:To make a glass container thin and lightweight and obtain a uniform image by providing a curvature on a display screen section in a vacuum in advance so that it is formed nearly into a plane under the atmospheric pressure. CONSTITUTION:This device is constituted of a glass container 1 and a display screen section 2, and phosphors illuminated by an electron beam is used for the display screen section 2. A curvature R is provided on the display screen section 2 in a vacuum in advance so that is formed nearly into a plane under the atmospheric pressure. Such a problem can be prevented that the interval of the link of an image is changed and no uniform image is obtained even when the distance from a control electrode block to the display screen section 2 is changed. This device can be made thin and lightweight.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a glass container for a flat panel image display device in video equipment.

Background of the Invention In recent years, flat panel image display devices have been desired to be thinner and lighter, as well as to have higher image quality. Conventionally, in this type of glass container for flat-panel image display devices, the display screen portion of the glass container itself was made almost flat, and the thickness was such that it remained flat even after being evacuated. Problems to be Solved by the Invention However, with this type of structure, there was a problem in that it was difficult to reduce the thickness and weight. That is, for example, the image display device shown in Japanese Patent Application No. 61-288672 uses electron beams from a plurality of electron beam sources to form an image at intervals between the electron beam sources, and then connects the images to form a screen. It was composed. Therefore, if the thickness of the glass container 4 is made thinner as shown in FIG. 3, when the image display device is evacuated, the glass container 4 will deform under atmospheric pressure as shown by the arrow, causing the control electrode block (not shown) to deform. There is a problem in that the distance from the display screen section 5 to the display screen section 5 changes, and the interval between the joints of the images changes, making it impossible to obtain a uniform image.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, it is an object of the present invention to reduce the thickness and weight of a device and to obtain a uniform image. Means for Solving the Problems In order to solve the above-mentioned problems, the glass container for an image display device of the present invention is characterized in that the display screen section is provided in advance with a curvature that becomes substantially flat at atmospheric pressure when evacuated. It has a structure. Function The present invention provides an image display device with the above-described structure.
By forming a nearly flat surface under atmospheric pressure when evacuated, it is possible to make it thinner and lighter, and to obtain uniform images. EXAMPLE Hereinafter, a glass container for an image display device 1 according to an example of the present invention will be described with reference to the drawings.

FIG. 1 shows a glass container for an image display device in one embodiment of the present invention. In Fig. 1, 1 is a glass container, and 2 is a display screen. In this embodiment, a phosphor that emits light with an electron beam is used as the display screen section 2. The display screen section 2 is previously provided with a curvature that becomes substantially flat at atmospheric pressure when evacuated. FIG. 2 is a diagram showing the image display device in a vacuum state. The glass container 1 has a display screen section 2
Since the part is made into a vacuum, it becomes almost flat at atmospheric pressure.

Next, the operation of the configuration of this embodiment will be explained.

The aspect ratio of the glass container in this example is about 1.4, and if the maximum deflection at the center of the glass container when it is evacuated is Wmax, then Wmax = 0.07.
An experimental formula of 7XPOxa'/E/h' was obtained. Here, PO; Atmospheric pressure Kg/Crn"a; Vertical dimension of glass container Cm b; Horizontal dimension of glass container Cm E; Young's modulus Kg/Crn"h; Glass container plate thickness Cm. Therefore, the longitudinal curvature is R
a, if the lateral curvature is Rb, then Ra=, I'4Wmax x" + a" /8WmaxR
The relationship h=74Wmax"10b"/8Wmax holds true. Therefore, if the glass container is provided with the curvatures of Ra and Rh in advance, it can be made substantially flat when evacuated.

Effects of the Invention The present invention has a structure in which the display screen portion of a glass container for an image display device is provided with a curvature that becomes substantially flat at atmospheric pressure when evacuated. This makes it possible to prevent the problem of not being able to obtain a uniform image due to changes in the distance between the image joints when the distance from the block to the display screen changes. Additionally, it can be made thinner and lighter.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a voltage glass container for an image display device according to an embodiment of the present invention, and FIG.
FIG. 3 is a sectional view showing a glass container of a conventional image display device.

Claims (1)

[Claims] 1. A glass container for an image display device, wherein the display screen portion of the container is provided with a display screen portion in the transparent portion, and the display screen portion is provided with a curvature that becomes substantially flat at atmospheric pressure after being evacuated.