JP2917294B2 - Exhaust pipe protection device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust pipe protection device for a flat panel type image display device among electron tubes for controlling an electron beam in a vacuum.

2. Description of the Related Art In an electron tube for controlling an electron beam in a vacuum, such as a cathode ray tube, it is necessary to perform vacuuming after assembling electrodes and the like. Therefore, an exhaust pipe made of glass is provided in the vacuum vessel of the electron tube, and after evacuation is performed from the exhaust pipe, a part of the exhaust pipe is heated and melted by a heater to be sealed. To keep the inside of the electron tube vacuum. However, glass exhaust pipes need to be heated and melted for sealing, cannot be made thick and strong due to their heat capacity, and because of their construction they protrude from the vacuum vessel, so they cannot withstand impact forces. And was easily damaged. Therefore, a structure for protecting the exhaust pipe after evacuation has been conventionally proposed and implemented.

Hereinafter, an example of a conventional technique in an exhaust pipe protection device will be described by taking a cathode ray tube as an example.

FIG. 2 is a cross-sectional view of a cathode ray tube for showing an example of the prior art. In the figure, portions not related to the exhaust pipe protection device are simplified for simplicity.
A vacuum vessel is formed by the panel 10 and the funnel 11, and an electron gun 13 is provided inside the neck portion 12, and a terminal 14 is provided. An exhaust pipe 15 made of glass is provided at the tip of the neck portion 12, and after evacuation, a portion of the exhaust pipe 15 is heated and melted by a heater to seal the portion, and the portion before the sealing portion 16 is sealed. Is disconnected. Then, a cap 17 made of synthetic resin is provided for protection of the exhaust pipe 15, fixed by fitting it into the terminal 14, and by surrounding the exhaust pipe 15, the shock applied to the exhaust pipe 15 is subjected to impact resistance through the cap 17. And the exhaust pipe 15 is not affected by impact.

Problems to be Solved by the Invention However, in the above configuration, in order to provide a cap for protecting the exhaust pipe, a terminal and a shock-resistant member instead of the terminal must be provided around or near the exhaust pipe. In flat-panel image display devices and the like, which are being developed in recent years, it is difficult to provide terminals around the exhaust pipe.
It has been desired to develop an exhaust pipe protection device that can protect the exhaust pipe without a terminal or a shock-resistant member in its place around or near the exhaust pipe.

In view of the above problems, the present invention provides an exhaust pipe protection that can protect an exhaust pipe without using a terminal or a shock-resistant member in the vicinity of or near the exhaust pipe so that the exhaust pipe can be used in a flat panel type image display device. An apparatus is provided.

Means for Solving the Problems To achieve this object, an exhaust pipe protection device of the present invention is provided with an exhaust pipe formed of glass in a vacuum vessel,
After sealing the exhaust pipe, an outer shell member is provided which surrounds from a contact portion between the vacuum vessel and the exhaust pipe to a tip of the sealed exhaust pipe, and has elasticity inside the outer shell member. It is configured to be filled with an adhesive.

Action With this configuration, the exhaust pipe protection device of the present invention provides an exhaust pipe formed of glass in a vacuum vessel, and after sealing the exhaust pipe, from a contact portion between the vacuum vessel and the exhaust pipe, By providing an outer shell member surrounding up to the end of the sealed exhaust pipe, it is possible to install a device capable of protecting the exhaust pipe without the need for a terminal or a shock-resistant member in place of or around the exhaust pipe, The impact on the exhaust pipe is received by the outer shell member so that the exhaust pipe is not affected by the impact. Further, by filling the inside of the outer shell member with an adhesive having elasticity, the adhesive makes it possible to eliminate a terminal or a shock-resistant member in place of the terminal around or near the exhaust pipe.
The outer member can be fixed, and the occurrence of thermal stress due to the difference in the coefficient of thermal expansion between the members bonded by the elasticity of the adhesive can be prevented, and the exhaust pipe can be stably protected over time. .

Embodiment An embodiment of the exhaust pipe protection device of the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view showing the configuration of an exhaust pipe protection device according to one embodiment of the present invention. It should be noted that a flat panel type image display device is taken as an example of the application of the present invention, and in FIG.

1 is an exhaust pipe, 3 is an outer member, 4 is an adhesive, 5 is a glass container, 6 is a flat container, 7 is an electrode unit, and 8 is a terminal. The glass container 5 and the flat container 6 are sealed with a frit 9a to form a vacuum container as a whole. An electrode unit 7 is provided inside, and a terminal 8 extends outside from the electrode unit 7 through the sealing surfaces of the glass container 5 and the flat container 6. The exhaust pipe 1 is inserted into a hole provided in the glass container 5, and is bonded with a frit 9b. After the evacuation pipe 1 is evacuated, a part of the evacuation pipe 1 is heated and melted by a heater to form a sealing part 2.
Is cut off. In this embodiment, the exhaust pipe 1
As a material for the above, lead glass having a low softening point and a wide softening temperature range is used due to the necessity of melting by heating. The outer shell member 3 is in contact with the glass container 5 and the glass container 5 and the exhaust pipe 1
Is provided so as to surround from the abutting portion to the sealing portion 2 which is the tip of the sealed exhaust pipe 1, and the inside of the outer casing member 3 is filled with an adhesive 4 having elasticity. In the present embodiment, as the material of the adhesive 4, a silicon bond having elasticity even after being cured is used.

With the above configuration, even when an impact force is applied to the exhaust pipe 1, the outer casing member 3 moves from the contact portion between the glass container 5 and the exhaust pipe 1,
Since it is provided so as to surround the sealed portion 2 which is the tip of the sealed exhaust pipe 1, the outer shell member 3 first receives the impact force, and then the impact force is dispersed throughout the adhesive 4. . The dispersed impact force is absorbed by the contact portion between the outer casing member 3 and the glass container 5 and the elastic deformation of the adhesive 4. In the above process, the impact force is not directly applied to the exhaust pipe 1, and the exhaust pipe 1 is protected.

As described above, the present embodiment also provides a device capable of protecting the exhaust pipe 1 even in this embodiment having no terminals around or near the exhaust pipe 1. In addition, since the adhesive 4 has elasticity, it is possible to prevent the occurrence of thermal stress due to the difference in the coefficient of thermal expansion between the members bonded by the elasticity, and to stabilize the exhaust pipe 1 over time.
Can be protected.

According to the exhaust pipe protection device of the present invention, an exhaust pipe made of glass is provided in a vacuum vessel, and after sealing the exhaust pipe, a contact portion between the vacuum vessel and the exhaust pipe is provided. An outer shell member surrounding the end of the sealed exhaust pipe is provided, and the outer shell member is filled with an elastic adhesive, so that a terminal or the like is provided around or near the exhaust pipe. It is possible to provide an exhaust pipe protection device capable of protecting an exhaust pipe without using a shock-resistant member instead, and is particularly suitable for use in a flat panel type image display device.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a configuration of an exhaust pipe protection device according to one embodiment of the present invention, and FIG. 2 is a cross-sectional view of a cathode ray tube showing an example of a conventional technique. 1 ... exhaust pipe, 3 ... shell member, 4 ... adhesive, 5 ...
Glass container, 6: flat container.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tomohiro Sekiguchi 1006 Kazuma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References JP-A-55-68042 (JP, A) JP-A-57-76737 (JP, A) JP-A-61-29035 (JP, A) Real opening 63-26960 (JP, U) (58) Fields surveyed (Int.Cl. ⁶ , DB name) H01J 29/86 H01J 9/34 H01J 31/15

Claims (1)

(57) [Claims] In a flat-panel type image display device provided with an exhaust pipe made of glass in a vacuum vessel, after sealing the exhaust pipe, a sealing portion is opened from a contact portion between the vacuum vessel and the exhaust pipe. An outer shell member surrounding the exhaust pipe which is stopped is provided, a space is provided between the outer shell member and the exhaust pipe, and the space is filled with an elastic adhesive; An exhaust pipe protection device, wherein there is no fitting portion other than the exhaust pipe.