JPH0261944A - Explosion prevented plane image display device - Google Patents

Abstract

PURPOSE:To prevent explosive contraction due to frop or shock by holding a plane type image displaying panel in a cabinet using a spring having a certain spring constant, and surrounding a chip tube with solids at a certain distance reserved between. CONSTITUTION:A back face vessel 8 is provided facing a front face glass vessel 9, whose inner surface is coated with fluorescent substance, and a cathode as electron source and an electrode consisting of a plurality of conductive plates are installed in the space bounded by these vessels 8, 9. A plane type image displaying panel 14 inside a vessel is in vacuum and supported in a cabinet 10 by a spring 11 having a certain spring constant. A chip tube 12 used at the time of vacuum drawing of this displaying panel 14 is surrounded by solids 13 with a certain distance reserved between. This allows absorption of eventual application of a drop or shock by the spring 11 to a certain degree, and when this limitation is exceeded, the solids 13 destroy the chip tube 12 to send air into the inside, which will prevent explosive contraction.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a vacuum tube type flat image display device for video equipment.

BACKGROUND ART Conventionally, liquid crystal display elements, plasma display elements, vacuum tube type display elements as EL display elements, etc. have been developed or sold as flat-screen televisions.

Among these, when compared in terms of performance such as brightness, contrast, and color reproducibility, vacuum tube type display elements are currently considered to be the most superior. Vacuum tube type display elements include fluorescent display tubes, deflection tubes, and color flat panels currently being developed by the present applicant.

To briefly describe the above-mentioned color flat panel, for the purpose of displaying color television images on a flat device, the screen is divided into wax-like sections without gaps, and each section is divided into electronic This is a vacuum tube type image display device that deflects and scans a beam to cause a phosphor to emit light, thereby forming a color television image as a whole.

An example of a method for mounting the above-mentioned vacuum tube type image display device to a cabinet will be described below with reference to the drawings.

FIG. 3 is a diagram showing the appearance of a conventional vacuum type image display device and the method for installing it in a cabinet.

In Figure 3, 1 is a rear container, 2 is a front glass container, and 3
is a cabinet, 4 is a pad that holds the mating surfaces of the back container 1 and the front glass container 2, 5 is a pad that holds the front glass container 2 and the back container 1 to the cabinet, and 6 is formed by the back container 1 and the front glass container 2. This is a tip tube for evacuating the space where the

The rear container 1 may be a glass container or a metal container. The front glass container 2 has a phosphor (not shown) coated on its inner surface. The cabinet 3 may be made of metal, wood, or resin. Pads 4 and 5 may be made of metal, wood, resin, or rubber. The chip tube 6 is a glass tube that is sealed after being evacuated.

If the entire structure consisting of the back container 1, the front glass container 2, the components of the space sandwiched between the back container 1 and the front glass container 2 (not shown), and the chip tube 6 is a flat image display panel 7, , a flat image display panel 7 is fixedly held on the cabinet 3 via pads 4 and 5.

Problems to be Solved by the Invention However, the above structure has the following safety problems.

As mentioned above, the flat image display panel 7 has a pad 4
and 5 are fixedly held on the cabinet 3. When a flat image display device having such a structure is dropped or subjected to impact, applied force is applied directly to the rear container 1 and the front glass container 2, and the stress is applied to the rear container 1 and the front glass container 2. If the allowable stress is exceeded, there is a risk that it will break and implosion will occur because there is a vacuum inside.

This is especially dangerous for portable products.

In view of the above problems, the present invention provides a highly safe explosion-proof flat image display device.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention first provides a flat image display panel that is held in a cabinet by a spring having a constant spring constant, and a chip tube. The structure is such that the area is surrounded by solid matter at a certain distance.

According to the present invention, when a drop or impact is applied to the above-mentioned flat image display device, the spring absorbs it up to a certain predetermined range, and when it exceeds a certain range, the solid object becomes a chip. By colliding with the tube and destroying the tip tube, air is sent inside to prevent implosion.

Embodiment Hereinafter, an explosion-proof flat image display device according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows the structure of an explosion-proof flat image display device according to an embodiment of the present invention. In Figure 1, 8 is a rear container, 9 is a front glass container, 10 is a cabinet, 1
1 is a spring; 12 is a tip tube; 13 is a solid body surrounding the tip tube 12 at a predetermined interval; 14 is a rear container 8;
The entire flat image display panel consisting of a front glass container 9, a chip tube 12, and structures inside the container (not shown) is shown.

The rear container 8 may be a glass container or a metal container. The front glass container 9 has a phosphor (not shown) coated on its inner surface. The cabinet 10 may be made of metal, wood, or resin. All springs 11 have a constant spring constant. The chip tube 12 is a glass tube that is sealed after being evacuated. Flat image display panel 1
4 is fixedly held on the cabinet 10 via the spring 11.

The operation when the explosion-proof flat image display device configured as described above is dropped or subjected to impact will be described below with reference to FIGS. 1 and 2.

First, when a force such as a drop or impact is applied to this flat image display device, the spring 11 absorbs the force to a certain extent, and the containers 8 and 9 are not destroyed. Furthermore, we will consider the case where a fall or impact exceeding a certain limit is applied. Spring 1 fixing and holding the flat image display panel 14 to the cabinet
The spring constant of 1 is C1, the mass of the flat image display panel 14 is M, the drop and impact acceleration is G, and in the enlarged view of FIG. Assume that 16 is equal to X. If the flat image display device is dropped or subjected to impact, spring 1
The force F applied to 1 is F2MG.

Also, the displacement Y of the spring 11 is y: F/C1, so
Y=:MG/C. When Y>X, that is, when the displacement Y of the spring 11 exceeds the spatial distance X between the tip tube 12 and the solid object 13, the solid object 13 collides with the tip tube 12 and destroys the tip tube 12.

In other words, by calculating the permissible drop and impact acceleration G applied to the flat image display device from the allowable stresses of the containers 8 and 9, and determining the spring constant C from that G, the flat image display device will not exceed the limit. Even if a drop or impact force is applied, the chip tube 12 will be destroyed first, and as a result, air will be pumped into the container, thereby preventing implosion. The container 8.9 is also provided with a cathode serving as an electron source and a plurality of conductive plates such as focusing, horizontal, and vertical deflection electrodes.

Effects of the Invention As described above, according to the present invention, it is possible to prevent implosion due to dropping or impact, and it is possible to provide a safer flat image display device.

[Brief explanation of the drawing]

Figure 1A is a plan sectional view and a front sectional view showing the structure of an explosion-proof flat image display device according to an embodiment of the present invention;
The figure is an enlarged view of the vicinity of the chip tube of the same device, and FIG. 7... Flat image display panel, 8...
Back capacity 9...Front glass container, 10...
・Cabinet, 11... Spring, 12...
...Chip tube, 13...Solid material.

Claims (1)

[Claims] A front glass container whose inner surface is coated with phosphor, a back container facing the front glass container, and an electrode consisting of a cathode serving as an electron source and a plurality of conductive plates in a space sandwiched by the back container and the front glass container. In a flat image display device comprising a flat image display panel with a vacuum inside a container and a cabinet housing the flat image display panel, the flat image display panel and the cabinet are held together by a certain spring. Explosion-proof type, characterized in that the tip tube is supported by a spring with a constant constant and is surrounded by a solid material at a certain distance when the flat image display panel is evacuated. Flat image display device.