JPH04190544A - Getter device - Google Patents

Abstract

PURPOSE:To obtain a large deposition area and realize a getter device which has such a capacity as a larger vacuum pump has by providing a bridging means which bridge a wire getter and a net deposition plate on the deposition face of a getter material of the bridged wire getter. CONSTITUTION:A bridging means 3 which bridges a wire getter 1 with a space above a fixed face 2 provided, and a net deposition plate 4 which is provided on the face of evaporation of a getter material in the bridged wire getter 1 are provided. When the wire getter 1 is heated with a current, the inside getter material evaporates in arrow directions and scattered. Then, the evaporated and gasified getter material reaches around the surface of the fixed face 2 due to a small blocking area of meshes 5, and it is deposited on a facing flat face 6 of the fixed face 2 as well as on mesh surfaces 7 so that a large deposition area can be obtained for the deposition on the mesh surfaces 7. Thus, such a capacity as that of a larger vacuum pump can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a getter device for maintaining the degree of vacuum in a flat panel image display device.

2. Description of the Related Art In electron tubes such as cathode ray tubes that control electron beams in a vacuum, getter devices have conventionally been used to maintain a high vacuum inside the tube against gas release from internal components. The conventional technology will be explained by taking as an example a getter device used in a flat panel image display device.

FIG. 3 is a perspective view showing the configuration of a conventional getter device. In addition, in the same figure, parts unrelated to the getter device are omitted to avoid complication.

-C In a flat plate type image display device having a small internal space, the volume of the device is reduced by configuring the getter device using a linear getter that is heated by electric current. 10 is a linear getter. The linear getter 10 is attached to a fixed surface 1 such as the back surface of a container of an image display device in which this getter device is provided.
1, it is stretched by a stretching means 12 using spring material.

Next, the flash operation of the linear getter 10 will be explained using the drawings. FIG. 4 is a sectional view showing the internal structure of the linear getter 10. A groove 14 is formed on one surface of the base material 13 of the linear getter 10, and a mixture is formed inside the groove 14.
15 is filled. As an example of the material of the mixture 15, when Ba is used as the getter material, a (Ba, AI, Ni) alloy or the like is used. When a current flows through the base material 13, a mixture flows along with the base material 13.
15 is heated. Then, the constituent elements of the mixture 15 react, and the getter material is liberated and evaporated. This released getter material scatters in the direction shown by the arrow in FIG. According to the above operating principle, the linear getter 0 is flashed by current heating. The getter material evaporated in this way is deposited on the fixed surface 11 facing the linear getter 10, and by adsorbing and reacting with residual gas molecules inside on the deposition surface, it plays the role of a vacuum pump to maintain the degree of vacuum. That's why. The capacity as a vacuum pump is proportional to the evaporation area.

Problems to be Solved by the Invention However, in the above configuration, the thickness of the vapor deposited getter material is thick directly below the linear getter, and as it moves away from the linear getter, it rapidly decreases due to the relationship between the increase in the vapor deposition distance and the vapor deposition angle. Therefore, a sufficient evaporation area cannot be obtained, and the getter's ability as a vacuum pump is reduced.

Therefore, in view of the above-mentioned problems, the present invention aims to provide a getter device that has the ability to function as a larger vacuum pump by obtaining a large evaporation area while using a linear getter that can reduce the device volume. .

Means for Solving the Problems The getter device of the present invention is a getter device using a linear getter flashed by current heating, the linear getter and a space provided between the linear getter and a fixed surface. A net-like vapor-deposited plate is provided on the surface of the getter material of the stretched linear getter.

Function: According to the getter device of the present invention, since the getter device uses a linear getter that is flashed by current heating, the linear getter and the linear getter can be attached to a fixed surface while keeping the device volume small. and a net-like vapor deposition plate is provided on the vapor deposition surface of the getter material of the stretched linear getter, so that the getter material is vapor deposited on the vapor deposition plate. By doing so, the vapor is deposited not only on the opposing plane of the fixed surface but also on the mesh portion, and a large vapor deposition area can be obtained, thereby providing a larger capacity as a vacuum pump.

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

FIG. 1 is a perspective view showing the configuration of a getter device according to an embodiment of the present invention. In addition, in the same figure, parts unrelated to the getter device are omitted to avoid complication. In a flat-plate image display device with a small internal space, the volume of the device can be reduced by configuring the getter device using a linear getter that is flashed by current heating. 1 is a linear getter. The linear getter 1 is stretched by a tensioning means 3 using a spring material to a fixed surface 2 such as the back surface of a container of an image display device in which this getter device is installed, and there is no space between the linear getter 1 and the fixed surface 2. A space is provided for. The vapor deposition plate 4 is formed of a cotton-like member, and is installed on the vapor deposition surface of the getter material of the linear getter.

Next, the operation of the getter device of the present invention will be explained.

2nd V is a cross-sectional view of the getter device of the present invention taken perpendicularly to the line direction of the linear getter 1. FIG. When the linear getter 1 is heated with electric current, the getter material inside evaporates and scatters in the direction of the arrow in the figure. The evaporated and gasified getter material wraps around the surface of the fixed surface 2 because the blocking area of the mesh 5 is small, and is deposited on the opposing flat part 6 of the fixed surface 2, as well as on the mesh surface 7. Therefore, a larger evaporation area can be obtained by the amount of evaporation on the mesh surface 7, and a larger capacity as a vacuum pump can be obtained.

Effects of the Invention According to the getter device of the present invention, since the getter device uses a linear getter that is flashed by current heating, the linear getter and the linear getter can be attached to a fixed surface while keeping the device volume small. By providing a net-like vapor deposition plate on the vapor deposition surface of the getter material of the stretched linear getter, the getter material can be applied to the vapor deposition plate. If it is vapor-deposited, it will be vapor-deposited not only on the opposing plane of the fixed surface but also on the mesh portion, and a large surface area can be obtained, and a larger capacity as a vacuum pump can be obtained. As described above, it can be said that achieving a higher ultimate degree of vacuum while making the device more compact will greatly benefit performance improvement.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the configuration of a getter device according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of the getter device, FIG. FIG. 3 is a cross-sectional view showing the internal configuration of a shaped getter. 1... Linear getter, 2... Fixed surface, 3...
...Stretching means, 4... Vapor deposited plate. Name of agent: Patent attorney Akira Kokaji and 2 others
mulberry

Claims (1)

[Claims] A getter device using a linear getter flashed by electric current heating, comprising the linear getter and a stretching means for stretching the linear getter with a space provided relative to a fixed surface, A getter device in which a net-like vapor deposition plate is provided on the vapor deposition surface of the getter material of the linear getter.