JPS6044941A - Manufacture of emission tube for discharge lamp - Google Patents

Abstract

PURPOSE:To prevent any impurities such as silica powder from adhering to the inner surface of an emission tube consisting of a quartz tube by ejecting clean air or gas from inside of the emission tube through its hole or branch tube consisting of a quartz tube from the time when the hole is formed in the emission tube to the time when the branch tube is fused to the emission tube. CONSTITUTION:An emission tube is manufactured by sealing the ends of an emission tube 1 consisting of a quartz tube, making a hole in the side of the emission tube 1 by locally heating and softening its side and fusing an exhaust branch tube consisting of a quartz tube around the hole. In the above method of manufacturing an emission tube, a dry gas such as clean air or nitrogen gas is used as a compressed gas fed into the emission tube 1 through a solenoid valve when a hole is formed in the emission tube 1 by locally heating its given area by means of a burner 3 so that any impurities are not sealed in the tube. Following the formation of the hole as well, the compressed gas is fed into the emission tube 1 before being ejected outside the tube 1 through the hole. Then, within a short ime, the end surface of a brach tube 2 is located at the shaped hole (B') before the periphery of the hole (B') and the end of the branch tube 2 are heated and fused. By the means mentioned above, any impurities such as silica powder can be prevented from adhering to the inner surface of the tube.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention provides a process for attaching a throat branch tube to the arc tube of a metal vapor discharge lamp (hereinafter referred to as 1-(, 1, D lamp)).
The present invention relates to an arc tube manufacturing method VC that prevents the adhesion of impurities such as silica and moisture within the luminous area.

fsiJ in the arc tube electrode sealing and evacuation process As shown in FIG. The entire process of welding the branch tube 2 to the arc tube I, which is conventional, will be explained below with reference to FIGS. 1 to 4.

I is an arc tube, 2 is an exhaust stand, and 3 is an annular burner. As shown in Fig. 6, this burner 3 has a burner nozzle 3a arranged at an even pitch on the circumference with respect to the axis Y-'Y', and the combustion flame is shaped like a cone with respect to the axis Y-'Y'. It is oriented to blow out in the -F direction. Therefore, the flame forms the Togane style 4 with Y −'Y' as the +14b center.

As shown in FIG. The combined combustion flow 4 is applied to A i:++ on the surface of the arc tube 1 to locally heat it and gradually soften it.Next, as shown in FIG. When the gas is pumped, the heating softens the hole B.
It's dark. As soon as the hole is made, the box, magnetism, 11゛7
Close the hole to stop the gas supply, and then heat the drilling hole 1 with a drawing bar 3 to shape the unevenness around the hole by rounding it. Next, as shown in Fig. 3, the branch U2 is emitted) t.
With the head fixed on the center line Reached the width of Tomari (~) c1
At this point, insert the lower end of branch pipe 2 into hole B of arc tube 1,
When the welding is completed and hardened as shown in FIG. 4, both ends of the arc tube are sealed and the chuck device 7 is removed to obtain the product shown in FIG.

However, in the conventional manufacturing method, when the arc tube 1 is ruptured or the hole B is completely heated and shaped, the V
Opening around hole C1. Since the lJJ hard case has an extremely thin wall thickness, it is heated excessively by the burner flame, becomes silica powder, is blown into the light emitting element 'a1, and sticks to the inner wall as an impurity. If the impurities of the silica powder remain on the inner wall of the arc tube I and are sent to the electrode surface or the exhaust process, the inclusions of metal or metal halide inside the arc tube and the silica powder will be removed during lamp operation. It reacts and emits light'13
A significant adverse effect occurs on the qlJ1/1- and the lifespan. Therefore, conventional products require time and effort to remove impurities by washing with water or boiling acid.

This "emission" was made in order to eliminate the drawbacks of conventional ones such as the Mj2 above, and by making air or gas blow out from the hole after drilling the light emitting sound, the glue force inside the arc tube was improved. V) Our goal is to provide a method for manufacturing an arc tube that can prevent the above problems.

An embodiment of the present invention will be described below with reference to the drawings.

In the process shown in Fig. 2, in order to locally heat the arc tube 1 and make a hole, a compressed gas is sent into the arc tube through an electric valve, and a filter is used to remove moisture. It is clean air 1 (・Using dry gas such as nitrogen gas to seal in impurity q)/J, 4:/I: Iyo VC, and even after drilling, the pressure A16 gas f-
The liquid is fed under pressure into the interior of the mirror 7, and is ejected to the outside through the hole 13. This is useful when heating and shaping the hole part! 31(
As shown in I, the pulverized silica powder can be prevented from entering the arc tube 1. The above compressed gas is generated A';'For the pressure feeding into B1, a hole is made ffB. The heating and shaping of B is completed 1/
Stop at this 11.1 point and get 10. Then, the end face of the branch 'θ2 to be bathed in the shaping hole 13' is placed in the short 115 space, and the periphery of the shaping hole B' and the end of the branch pipe 2 are heated (r7r, r7i1A degree). Branch pipe 2 is reached at 76 points.
Weld it to the arc tube l...]r, L., After heating and shaping the hole I3, insert it into the arc tube ++-,! 31 Even if the gas supply is stopped, the thin wall of the holed part l+l +,,+ ;1λζ・J', k'i melts into a ball Jc, becomes relatively thick, and becomes silica powder'. Also, after stopping the supply of pressurized gas, the end of the branch 11゛2 should be brought close to the burner hole B', and the burner 10 should be removed. 3 combustion flame Q, 1. The collective flow no longer fully merges 1, and the shaped hole 1
3' and branch/r? 2) Narrow the surface gap (! Combustion flame Q-1 can hardly enter A7 and ?lff1 into the arc tube.

1, the above one (according to the invention in /), the hole in the arc tube &
lJ': Since clean air or gas is blown out from the perforated part until the return of J, f surface branch/i', impurities such as silica powder (= J Afterwards, there is no +I=-C, and there is almost no infiltration of the combustion flame into the arc tube, so there is very little moisture inside the tube, and therefore there is no explosion.
j. Since the inside of the pipe is kept clean, the conventional processes such as cleaning, boiling, and drying can be omitted, resulting in an economical effect.

[Brief explanation of the drawing]

Figures 1 and 4 show the name of the conventional arc tube manufacturing method.
Figures 5 and 6 are perspective views of the burner, and Figure 7 is a diagram after the arc tube has been manufactured. , No. 91 No. 1 is a sectional view of the manufacturing method according to the present invention. ■... Arc tube, B... Hole portion, B'... Shaped hole, 2... Branch pipe, 3... Annular burner, A... Connection, E open [ ] Green, T... Silica powder. In the diagram, the same - relative same - or equivalent part is 7J < 0 Agent Oiwa Masu j4L No. 7 Figure 8 Figure 9 Procedure ?+Ii Original (spontaneous) 1 Indication of 1.1° Request 58-15125
6 No. 2, Name of invention Luminescence % of discharge lamp - Manufacturing power method: 3. If an amendment is made, the representative, Hitoshi Katayama, Part 4, Agent 5, each column for the detailed description of the invention and the brief description of the drawings of the specification subject to the amendment. 6 Contents of amendment +I+ On page 3 of the specification, line 11, "Device 7" is corrected to "Device 6." (2) On page 3, line 14, ``tear or hole punch'' is corrected to ``bag hole''. (3) Correct line 4, line 16 of ``Clean air due to..., etc.'' to [Clean air due to..., etc.'' [41, page 6, line 9 “Figures 1 and 4” were changed to “Figures 1 to 4”
"Fig." is corrected.

Claims (1)

[Claims] (Both ends of the arc tube made of a D stone-cut tube are sealed,
l+! One part is locally heated and softened to make a hole, and then a 4-node pneumatic branch pipe made of quartz tube is inserted into the hole.
l"n)r, "success v: In the tube manufacturing method, from the hole in the arc tube to the bath 7n' with an alternating branch, during cleaning from the inside of the arc tube 4 A method for producing an arc tube for a discharge lamp, which is characterized in that the arc tube is ejected from the holes i to 1 or branches 'U↓9. 7 from inside the arc tube until shaping.
A method for manufacturing an arc tube for a discharge lamp according to claim 1, characterized in that F7 purified air or gas is ejected from the perforated portion.