JPH06124656A - Manufacturing method of small discharge lamp - Google Patents

Abstract

(57) [Summary] [Structure] Impurity gas in the lamp body 5 is opened at the lower end 5b.
From the lamp body 5 through the opening 5a at the upper end
Inert gas is supplied to the inside. At this time, a smooth gas flow occurs in the lamp body 5. When the lamp body 5 is filled with the inert gas, the flow in the lamp body 5 is stopped, and the lamp body 5 is heated to seal and mount the mounts 6 and 6 to the lamp body 5. [Effect] Since a smooth gas flow occurs in the lamp body, the time required to discharge the impure gas is high and the working efficiency is high. Further, the impure gas in the lamp body is completely discharged, and This has the effect of preventing oxidation of the electrodes due to the impure gas remaining in the main body, ensuring high purity of the inert gas sealed in the lamp body, and achieving high brightness and long life.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a small discharge lamp having an outer diameter of about 3 to 4 mm without deteriorating work efficiency and quality.

[0002]

2. Description of the Related Art Conventionally, as a method of manufacturing a small discharge lamp used as a back up light or the like mounted on the back side of a liquid crystal display surface, one end of a lamp body made of a glass tube having both ends opened is hollow. Inside, the mount holding the electrode is supported, the opening at one end of the lamp body is sealed and the mount is fixed, and then the other end holding the electrode in the hollow at the other end of the lamp body. The mount is supported in a state in which the inside and outside of the lamp body are in fluid communication with each other, and the impure gas such as air in the lamp body is sucked and discharged through the opening at the other end, and at the same time, argon etc. A means of supplying an inert gas and then sealing the opening at the other end of the lamp body to fix another mount is adopted, and a small discharge run manufactured by such a conventional method is adopted. Has an outer diameter has been filed that of the thickness of the order of 8 to 10 mm.

[0003]

In recent years, the outer diameter size is 3
There is a demand for thinner small discharge lamps of about 4 mm, and in the production of such thin small discharge lamps, impure gas is discharged with one end of the lamp body sealed. If you try to use the conventional method,
Not only does it take a long time to discharge the impure gas, but it is also impossible to completely remove the impure gas in the inner end portion of the lamp body that is sealed, and therefore, the work efficiency is not lowered. It is unavoidable, the problem that the impure gas that remains in the lamp body causes oxidation of the electrode, and that the remaining impure gas mixes with the inert gas causes a decrease in brightness and a decrease in life. This will cause problems.

The present invention was devised in view of the above circumstances, and a small discharge lamp having an outer diameter of about 3 to 4 mm can be manufactured without lowering work efficiency and quality. It provides a way to do it.

[0005]

As a means for solving the above-mentioned problems, the present invention provides a lamp body having a mount holding electrodes inside a hollow of both ends of a lamp body made of a glass tube having both ends opened. The inside and outside of the lamp are supported in such a manner that gas can flow therethrough. An inert gas such as the above is supplied, the opening at one end and the opening at the other end of the lamp body are sealed, and mounts are fixed to both ends of the lamp body.

[0006]

The present invention has the above-described structure, and while the impure gas in the lamp body is sucked through the opening at one end, the inert gas is supplied into the lamp body through the opening at the other end.
In this step, even if the lamp body is thin, a smooth gas flow occurs in the lamp body, and the impure gas in the lamp body is completely discharged by this flow.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. A pair of upper and lower cylindrical lamp holders 1a and 1b are provided at a plurality of positions of a constant angle pitch on a turntable (not shown), with their mounting holes 2a and 2b facing each other. An inactive gas supply source (not shown) for supplying an inert gas such as argon is elastic to the inflow port 3a of each pair of lamp holders 1a and 1b, which communicates with the mounting hole 2a of the upper lamp holder 1a. Connected via an inflow hose 4a having
A vacuum pump (not shown) is connected to the outflow port 3b communicating with the mounting hole 2b of the lower lamp holder 1b via an elastic outflow hose 4b.

The lamp body 5 of the small discharge lamp to be manufactured
Is a glass tube having an outer diameter of about 3 to 4 mm and having open ends. The mounts 6 fixed to both ends of the lamp body 5 have a structure in which the beads 9 and the electrodes 10 are fixed to the protruding ends of the lead wires 8 which are inserted into the needles 7 whose outer diameter is smaller than the inner diameter of the lamp body 5. Become.

When manufacturing a small discharge lamp, the mount 6 is mounted in the mounting holes 2a and 2b of the lamp holders 1a and 1b.
Mount holder 11 that holds the base end of the
A plate 13 having a mount 6 penetrating therethrough is fitted into the lamp body 5, and further, mouthpieces 15 externally fitted to both ends of the lamp body 5 are attached so that the mount 6 is fitted into the hollow of the lamp body 5. A mouth rubber retainer 16 for preventing the mouth rubber 15 from coming off is fitted in the openings of the mounting holes 2a, 2b while being fitted in the holes 2a, 2b in an airtight manner. The mounts 6, 6 are held by the lamp holders 1a, 1b.

In such a state, the inside of the lamp body 5 has an opening 5a at its upper end (corresponding to the opening at the other end which is a component of the present invention), the central hole 14 of the plate 13, the upper surface of the plate 13 and the mount. It communicates with the inflow port 3a through the space 17 between the lower surface of the holder 11 and the inflow hole 18a of the mount holder 11 to form an inflow path into the lamp body 5, and also the lamp body. The inside of 5 is an opening at the lower end (corresponding to the opening at one end which is a component of the present invention) 5b, and the central hole 1 of the plate 13.
4, the space 17 between the lower surface of the plate 13 and the upper surface of the mount holder 11, and the outflow hole 1 of the mount holder 11.
It communicates with the outflow port 3b via 8b and constitutes an outflow path from the inside of the lamp body 5.

Next, both a vacuum pump (not shown) and an inert gas supply source (not shown) are operated. As a result, impure gas such as air in the lamp body 5 is sucked and discharged to the outside of the lamp body 5 through the gap between the inner circumference of the lamp body 5 and the outer circumference of the mount 6 and the outflow path. The inert gas is supplied to the inside of the lamp body 5 through the inflow path and the gap between the inner circumference of the lamp body 5 and the outer circumference of the mount 6.

During this time, a smooth flow of gas is generated in the lamp body 5 along the lengthwise direction thereof, and by this flow, all the impure gas in the lamp body 5 is discharged.

When the inside of the lamp body 5 and the inflow path and the outflow path are filled with an inert gas, the pinch roller 2
By eccentrically rotating 0, the inflow hose 4a and the outflow hose 4b are clamped between the clamping block 21 and the flow of the inert gas through the lamp body 5 is stopped.

In such a state, the vicinity of both ends of the lamp body 5 is heated by means (not shown) such as a burner to seal the inside of the lamp body 5 and integrally seal the lamp body 5 and the mount 6 at the sealed portion. Fix it. After this,
The lamp body 5 is cut at the sealed portion, and unnecessary portions at both ends held by the lamp holders 1a and 1b are cut off and transferred to the next step.

In this embodiment, the mount 6 has a structure in which the bead 9 and the electrode 10 are fixed to the protruding end portion of the lead wire 8 which is inserted into the needle 7 having the outer diameter dimension smaller than the inner diameter of the lamp body 5. However, the present invention can be applied to the case where the mount has a structure other than that of this embodiment.

[0016]

As described in detail in the above embodiments, in the method of the present invention, even if the lamp body is thin, a smooth flow of gas is generated in the lamp body, and the flow causes impure gas in the lamp body. Is being completely discharged.

Therefore, even when a small discharge lamp having a small outer diameter is manufactured, the time required for exhausting the impure gas is short and the working efficiency can be improved. The effect of preventing oxidation of the electrode due to residual impure gas, ensuring high purity of the inert gas enclosed in the lamp body, achieving high brightness and long life, and obtaining high quality products is there.

Further, the impure gas in the lamp body is discharged and the inert gas is supplied into the lamp body at the same time, and the opening at one end of the lamp body and the opening at the other end are simultaneously sealed. Since this is performed, the number of steps is smaller than that in the conventional method in which these are performed separately, and there is an effect that production efficiency can be improved.

[Brief description of drawings]

FIG. 1A is a cross-sectional view showing a step of supplying an inert gas into the lamp body while sucking an impure gas in the lamp body. (B) is a cross-sectional view showing a process of sealing both ends of the lamp body and fixing the mount.

[Explanation of symbols]

5: Lamp body 5a: Opening at the upper end (opening at the other end) 5
b: Lower end opening (one end opening) 6: Mount 10:
electrode

Claims (1)

[Claims] 1. A lamp-supporting mount is supported in the hollow of both ends of a lamp body made of a glass tube with both ends opened in a state in which the inside and outside of the lamp body are in fluid communication with each other, While sucking an impure gas such as air in the lamp body from the opening at one end of the lamp body, an inert gas such as argon is supplied from the opening at the other end into the lamp body, and the opening at the one end of the lamp body A method for manufacturing a small-sized discharge lamp, wherein the mount is fixed to both ends of the lamp body by sealing the opening at the other end.