JP2637855B2 - Exhaust method of fluorescent display tube - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for exhausting a fluorescent display tube, and more particularly to a method for exhausting a fluorescent display tube in which an exhaust hole is sealed with a cover member.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 3, a fluorescent display tube of this kind is previously evacuated to a fluorescent material anode, an electron acceleration control grid, an electron emission filament, etc. Is installed, and exhaust holes 3
A step of aligning the vacuum-tight container 2 provided with the above at the corners using the positioning jig 7 and fixing the same to the exhaust head 4, a step of heating the vacuum-tight container 2, Evacuation of the inside of the vacuum-tight container 2 from the exhaust hole 3 through the O-ring 1, and the low-melting glass on the lid member 5 placed on the top of the lid heater 6 inside the exhaust head 4. Is heated and melted, a step of thermally decomposing the filament, and a step of sealing the exhaust hole 3 with the lid member 5 using the molten low melting point glass.

[0003]

In the above-mentioned conventional method for exhausting a fluorescent display tube, the positioning of the vacuum hermetic container at the time of fixing to the exhaust head is performed at the corner of the vacuum hermetic container. If there is a misalignment of the combination, a cutting error in the glass substrate, etc., or a misalignment when fixing the vacuum-tight container at the stage, the position of the lid member that seals the exhaust hole is greatly shifted, which is fatal to the fluorescent display tube. There is a drawback that a large leak defect occurs.

Further, when the type of the fluorescent display tube is changed, there is a disadvantage that it is necessary to change the position of the positioning jig in accordance with the size of the vacuum-tight container.

It is an object of the present invention to provide a method for exhausting a fluorescent display tube which does not require a positioning jig and does not cause a leak due to a displacement of a lid member.

[0006]

According to the present invention, an exhaust hole is provided in a part of a vacuum hermetic container formed by sealing a cover glass and a substrate glass with low melting point glass, and the inside of the vacuum hermetic container is provided. In a method for exhausting a fluorescent display tube, wherein the exhaust hole is evacuated and the exhaust hole is sealed with a lid member using low-melting glass, a concave portion is provided around the exhaust hole, and the convex portion of the exhaust head is aligned with the concave portion. Fixing the vacuum-tight container, heating the vacuum-tight container, and evacuating the inside of the vacuum-tight container to a vacuum from the exhaust hole through an O-ring around a convex portion of the exhaust head, A step of heating the lid member disposed on the top of the lid member heater of the exhaust head to melt the low-melting glass, a step of heating and decomposing the flamen, With the lid member Configured to include a step of stopping.

[0007]

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view of an exhaust head for explaining a first embodiment of the present invention.

In the first embodiment, as shown in FIG. 1, first, a vacuum-tight container 2 provided with a concave portion 9 around the exhaust hole 3 is fixed to the concave portion 8 of the exhaust head 4.

Next, the inside of the vacuum-tight container 2 is evacuated from the exhaust hole 3 through the O-ring 1 around the concave portion 8 of the exhaust head 4 while heating the vacuum-tight container 2 by an external oven (not shown). Exhaust.

Next, after the filament (not shown) disposed inside the vacuum-tight container 2 is thermally decomposed, it is applied to the heated and melted lid member 5 by the lid heater 6. Lid heater 6 made of low melting glass
Is raised and the cover member 5 is pressed around the exhaust hole 3 to seal the exhaust hole 3 and complete the exhaust. In the exhaust method according to the present embodiment, the concave portion 9 of the vacuum tight container 2 and the exhaust head 4
By performing alignment by aligning the convex portions 8, the misalignment of the lid member, which has conventionally occurred by 1 to 2%, could be completely prevented.

FIG. 2 is a sectional view of an exhaust head for explaining a second embodiment of the present invention.

In the second embodiment, as shown in FIG. 2, the concave portion 8 of the exhaust head 4 is tapered.
The positioning of the vacuum hermetic container 2 becomes smoother and cracks in the concave portion 9 of the vacuum hermetic container 2 can be prevented.

[0014]

As described above, according to the present invention, the concave portion provided around the exhaust hole is aligned with the convex portion of the exhaust head to fix the vacuum hermetic container. This has the effect that it is possible to prevent the occurrence of a defect that is fatal to the fluorescent display tube, such as a displacement of the lid member, which occurs when the operation is performed.

Further, even when the type of the fluorescent display tube is changed, it is not necessary to change the position of the positioning jig, so that the number of exhaust steps can be reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an exhaust head for explaining a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of an exhaust head illustrating a second embodiment of the present invention.

FIG. 3 is a sectional view of an exhaust head for explaining a conventional exhaust method of a fluorescent display tube.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 O-ring 2 Vacuum-tight container 3 Exhaust hole 4 Exhaust head 5 Lid member 6 Lid heater 7 Alignment jig 8 Convex part 9 Recess

Claims (1)

(57) [Claims] An exhaust hole is provided in a part of a vacuum-tight container formed by sealing a cover glass and a substrate glass with low-melting glass, and the inside of the vacuum-tight container is evacuated to a vacuum. A method of exhausting a fluorescent display tube sealed with a lid member using low-melting glass, a step of fixing the vacuum-tight container by providing a concave portion around the exhaust hole and aligning a convex portion of an exhaust head with the concave portion. Heating the vacuum tight container;
Exhausting the inside of the vacuum-tight container from the exhaust hole to a vacuum via an O-ring around a convex portion of the exhaust head;
A step of heating the lid member disposed on the top of the lid member heater of the exhaust head to melt the low-melting glass, a step of heating and decomposing the flamen, And sealing with a lid member.