JPS6229040A - Manufacture of luminous tube for metallic vapor discharge lamp - Google Patents

Abstract

PURPOSE:To transfer the additive and operate the main sealing work simply and rapidly,and prevent the remaining in a subtube or reduction of the additive, by transferring the additive substance attached in the exhaust subtube in heating with a ring form burner after a preliminary sealing, and then sealing up the container between the exhaust subtube and a luminous tube. CONSTITUTION:Against a luminous tube and a subtube 9 held by an exhaust unit 3, a burner 100 is arranged to place the nozzle 110 of the burner 100 about at the preliminary sealing portion 12, and a burning gas focus flow 111 is formed under the burner. As well as the preliminary sealing is performed, additives 4 attached at the inner surface of the subtube 2 is melted or sublimated to expel into the luminous tube 1 in such a way. The additives 4 expelled to the luminous tube 1 disperses in a cool portion where the burning gas does not reach. After almost all additives 4 move in the luminous tube 1, the burner 100 is brought down and placed where the extension of the nozzle 110 comes to around the main sealing portion of the luminous tube 1, and heated concentrically to seal up the connection between the luminous tube 1 and the subtube 2.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing a metal vapor discharge lamp arc tube.

[Conventional technology]

Conventionally, a method for manufacturing a metal vapor discharge lamp arc tube has been carried out as shown in FIG. That is, as shown in Figure 3, there is a quartz light depositing tube l and an exhaust branch pipe (hereinafter referred to as the branch pipe).
2 are welded in advance in a separate process, and the arc tube 1 is connected to an exhaust device 3 via a branch pipe 2, and the arc tube 1 is evacuated to a high vacuum by the exhaust device 3 via the branch pipe 2. When the arc tube 1 is evacuated to a high vacuum, additives such as sodium miramide and scansium iodide (hereinafter referred to as additives) 4 are introduced into the arc tube 1 via a branch pipe 2.

Thereafter, as shown in FIG. 3(B), the arc tube 1 is heated in the heating furnace 6 while evacuation continues. In this process, a part of the branch pipe 2 is forcibly cooled using cooling compressed air 7, etc.
The additive 4 that has sublimated due to heating and flowed into the branch pipe 2 is cooled by the cooled compressed air 7 and condensed on the inner surface of the branch pipe 2 to prevent it from being discharged into the exhaust device 3. In this way, the additive 4 is heated and sublimated while exhausting the inside of the arc tube 1, and then the additive 4 is heated and sublimated in the branch tube 2 again.
Condensation on the inner surface of the additive 4 is essential in the manufacturing process of high-quality metal vapor discharge lamps in order to remove impurity gases such as moisture contained in the additive 4.

After almost all of the additive 4 has adhered to the inner surface of the branch pipe 2, the third
As shown in Fig. As shown in Fig. 3 (2), the branch v2 is sealed with a sealing burner 8 at a position where the additive 4 attached to the inner surface of the branch pipe 2 is on the arc tube 1 side (hereinafter, this process is referred to as pre-sealing). ), and then disconnect it from the exhaust system 3 as shown in Figure 3. The sealed burner 8 is, for example, a double type hand burner manufactured by Takamitsu Industries ■ or a hand burner manufactured by J&PMACHINE&
TOOL COMPANY)iAND-TORCH
ES is used. All burners have craters facing each other horizontally, and the combustion gas is commercially available natural gas (
Tokyo Gas) or propane gas mixed with an appropriate amount of oxygen is used to generate enough heat to melt the quartz branches v2. In this way, the pre-sealed arc tube 9 with branch tubes is prepared by exposing the branch tube 2 to the flame of the heating burner 10 manually as shown in FIG. dissolve or sublimate
Drive it into the arc tube 1. Add the entire amount of additive 4 to the arc tube 1
After moving the branch pipe 2, which is unnecessary as a discharge lamp luminous tube, to the hand burner 8 as shown in Fig.
The connecting portion 11 with the arc tube 1 is manually sealed and disconnected using a .

[Problem that the invention seeks to solve]

However, in the conventional manufacturing method described above, the work of driving the additive 4 in the pre-sealed rear branch tube 2 into the arc tube 1 is done manually using a heating burner 10, and then the hand burner Since the sealing work was performed manually again in 8, a dedicated burner of type 29 was required and efficiency was poor. In addition, when heating the branch pipe 2 with the heating burner 10 when moving the additive 4 from the branch pipe 2 into the arc tube 1, the movement of the additive 4 is visually observed and heated, but the branch pipe 2 is made of quartz and is heated to a high temperature. Additive 4 cannot be heated uniformly due to the difficulty of visual inspection.
However, there is a problem with metal vapor discharge lamps in that if the amount of the added amount is not accurately sealed, the luminous efficiency and luminous characteristics will be greatly affected. Further, it is possible that only a part of the branch pipe 2 is heated excessively, and in this case, the additive 4 and quartz may partially react and the amount added may be reduced.

The present invention has been made in order to solve the above-mentioned conventional problems, and it is possible to easily and quickly carry out the movement of additives from the branch tube to the arc tube after preliminary sealing and the main sealing operation. It is an object of the present invention to provide a method for manufacturing a metal vapor discharge lamp arc tube that can prevent additives from remaining in branch tubes or decreasing.

[Means for solving problems]

The method for manufacturing a metal vapor discharge lamp arc tube according to the present invention is characterized in that, after preliminary sealing, a combustion gas flame flows downward as a collective flow by heating a ring-shaped burner, thereby removing additive substances attached to an exhaust branch pipe and emitting light from the ring-shaped burner. While moving it into the tube, the connection between the exhaust branch pipe and the arc tube is then completely sealed.

[For production]

In the present invention, a pre-sealed arc tube with branch pipes is used in a ring-shaped burner having a structure in which the combustion gas flame flows downward as a collective flow, and the combustion gas flame is carefully connected to the collective flow in the combustion gas collective flow. By positioning the branch pipes so that they coincide with each other and moving the burner relatively up and down along the axis of the branch pipes, the additive substance adhering to the inner surface of the branch pipes is driven into the arc tube, and then The arc tube is sealed by keeping the mouth of the ring-shaped burner close to the joint between the arc tube and the branch tube.

〔Example〕

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

Figures 5 to 7 show a ring-shaped purse 10 used in this example.
0, 101 is the burner body, 102 combustion gas supply ports, 103 to 105 are combustion gas flow paths, 106, 106
' is a blind lid sealed by brazing, and a hole 107 is made in the center of the burner body 101, and an opening 108 is further provided. Also, the vertical axis x −x' of the burner 100
A surface 109 is provided at an angle to , and the surface 109 is provided with a plurality of burner craters 110i circumferentially arranged so that the extension lines of the centers of the holes of each crater intersect at a point Y on approximately x - x'. establish. Each of the craters 110 is connected to one of the combustion gas flow paths 103 to 105. When the burner 100 is ignited, the combustion gas forms a collective flow 111 passing through the axis of the hole 107 downward, as shown by the button in FIG. Now, in FIGS. 1 and 2, a part 12 of the branch pipe 2 is connected to the exhaust device 3 via the arc tube Irl1 branch v2, and as in the conventional case, the part 12 of the branch pipe 2 is Pre-sealed with. In this embodiment, the arc tube with branch tube 9 and the exhaust device 3 are not separated from each other as in the conventional case shown in FIG. 3, so that the next step can be easily carried out. The burner 100 is arranged so that it is located near the vent 110 of the burner 100 or the preliminary sealing part 12 with respect to the arc tube with branch tube 9 held by the exhaust device 3, so that combustion occurs below the burner. A collective flow 111 is formed.

In addition, the axes of the hole 107 and the branch pipe 2 are approximately aligned, so that the collective flow 1
11 to wrap the branch pipe 2 and heat it. The heating situation is such that the area where the extension line of the crater 110, that is, the line connecting point Y and the crater 110, intersects the cone created around the burner axis x-x' and the surface of the branch pipe 2 is also the tip of the combustion wick length. Since the furnace gas is also concentrated nearby, the warmest temperature is highest, and as it moves away from the bottom, the collective flow 1
Since the temperature of the branch pipe 11 decreases, the heating of the branch pipe 2 also decreases. Since the ascending combustion gas flows slightly above the burner 100, the branch pipe 2 is also slightly heated near the burner 100. In this way, the burner 100 is moved downward while heating the branch pipe 2 with the combustion gas of the burner 100, and the reciprocating movement is reversed as necessary.

In this way, the additive 4 adhering to the inner surface of the branch tube 2 is melted or sublimated and driven into the arc tube 1. The additive 4 forced into the arc tube 1 is dispersed in a cold place where combustion gas is difficult to burn. Move the entire amount of additives 4 into the luminescent tube 1/
After +, as shown in FIG. The space between the branch pipes 2 is sealed. Note that, depending on the case, the arc tube 1 and the branch tube 2 may not be separated. In addition, after the branch pipe 2 was preliminarily sealed, the arc tube 9 with branch pipe was not separated from the total exhaust device 3;
As shown in FIG. 3 (■) in the conventional method, this is completely separated, the burner 100 is fixed in another device, and the arc tube 9 with branch tubes is moved to move the additive 4 and seal the arc tube l. Also good. In this case, it is not necessary to provide the opening 108 in the burner 100, and the combustion gas flow becomes more stable.

8 to 14 show a second embodiment of the present invention, and 10
0a is a first ring-shaped burner, and a second ring-shaped burner stacked on the ring-shaped burner 100a of 100bij[1, both of which are the same as the ring-shaped burner 100.

14 is a cylindrical burner superimposed on the second ring-shaped burner 100b.
-7+ 1 AQ disaster; 攬沙BUKI STATE - These burners 14, 100a, 100b can burn independently, and a burner body 15 is formed by them. First, as shown in FIG. 8, the arc tube 9 with a branch tube is pre-sealed in the same manner as in FIG. Additive 4 is distributed and attached. This adhesion distribution state is almost similar to the cooling temperature distribution when the branch pipe 2 is cooled by a cooling blast or the like during purification of the additive 4. The light emitting v1 is vertically upwardly moved by the chuck device (
(not shown) so that its axial center coincides with the axial center of the burner body 15. Burner 14°100a,
100b are all ignited. During this ignition combustion,
The burner body 15 is a ring-shaped burner 100a.

Downward collective flow 111a, 1llb by 100b
The core lengths 112 scattered in a ring shape at approximately equal pitches in the ring-shaped burner 100a, the core lengths 113 of the ring-shaped burner 100b, and the combustion gas i114 within the cylinder of the cylindrical burner 14 are all generated.

Next, the chuck device for the arc tube 1 is moved upward at a constant speed by a vertical earth moving device (not shown) driven by a variable speed motor. In the position shown in FIG. 9, the branch pipe 2 is preheated from above to below by the combustion collective flow 111a by the first ring-shaped burner 100a, and the vicinity of the tip 2a of the branch pipe 2 is heated by the first ring-shaped burner 100a. It is heated strongly by the core length 112 of the burner 100a, and the temperature rises. When it rises further and reaches the position shown in Fig. 10, the middle part of the branch pipe 2 becomes the first
The branch pipe 2 is preheated by the combined combustion flow 111a of the ring-shaped burner 100a, and the branch pipe 2 is further heated by the core length 112, and the additive 4 attached to the inner surface of the branch v2 becomes semi-molten and flows downward. It moves (somewhat due to gravity, but mostly due to the surface tension of liquefaction). At this time, part of the additive 4 evaporates, moves to the inner surface of the arc tube 1 where the temperature is low, and solidifies and adheres thereto. Furthermore, there is a second ring-shaped burner 1oob above the first ring-shaped burner 100a, and the branch pipe 2 is further heated by its core length 113.
The semi-molten additive 4 is completely fluidized and moves downward, and a part of it evaporates and moves into the arc tube 1.

When the arc tube with branch tube 9 rises to the position shown in FIG. At the same time, a part of it evaporates and adheres to the inner surface of the cooling wall in the arc tube 1, and also
The combined combustion flow 111a of the ring-shaped burner 100a heats the joint 13 between the arc tube 1 and the branch tube 2. This joint 1
Since the heat capacity of the pipe 3 is larger than that of the branch pipe 2, the temperature rise is slower and the temperature is lower than that of the branch pipe 2. Therefore, the additive 4 flows and moves and solidifies when it reaches the vicinity of this joint 13.
3, the first combined combustion flow 111a (
Combustion collective flow 111b of second ring-shaped gas 100b
Needless to say, the two also join together and contribute to the heating of the joint portion 13. ) It is advisable to preheat. Such preheating action also increases the temperature of the joint portion 13, making it easier to efficiently move the additive 4 accumulated in this vicinity into the arc tube 1. Also, the branch pipe 2 from which the additive 4 has been removed
The upper part is kept warm by the flame 114 of the cylindrical burner 14 so that the evaporated additive 4 does not solidify again.

As described above, the branched arc tube 9 is raised one after another, and the additive 4 is
After completely moving into the arc tube 1, the second ring-shaped burner 100b is completely extinguished at the position shown in FIG. It is held against the sealing point 16 and the sealing point 16 is melted and sealed. Continuing.

When the upper part of the branch tube 2 is held by the chuck device 17) and the arc tube 1 is lowered to the position shown in FIG.
Since No. 6 is melted, the quartz glass extends like a thread. 1
7 indicates this filamentous portion. If the arc tube 1i is stopped in this state, the core length of the first ring-shaped burner 100a will be 11.
At step 2, the filamentous portion 17 is fused and the arc tube 1 and the branch tube 2 are separated. At this time, the combined combustion flow 111a of the first ring-shaped burner 100a continues to heat the sealing part 16'f, so that a rapid temperature drop in the sealing part 16 can be prevented.

Next, as shown in FIG. 14, the arc tube 1 is gradually raised again while melting and rolling the filamentous portion 18, and the sealing portion 1 of the arc tube 1 is raised.
6 into a predetermined shape.
Finish with a core length of 112. By stopping the gas in the burner body 15 and extinguishing the fire in the state shown in FIG. 14, the additive 4 adhering to the branch pipe 2 is sealed inside the arc tube 1, and the branch pipe 2 is also removed. , the arc tube 1 is completed.

In the second embodiment described above, the branch pipe 2 is preheated, main heated, and kept warm by the burner body 15, and the branch pipe 2 is quickly swollen.

In addition, since the branch tube 2 and the arc tube 1 are sealed immediately after the additive 40 is moved into the arc tube 1, the branch tube 2 is maintained at a high temperature, and the sealing work can be performed efficiently. I can do it. Furthermore, the heat capacity of the joint 13 between the arc tube 1 and the branch pipe 2 is suddenly large, so additives and additives 4 tend to accumulate near the joint 13 while flowing into the arc tube 1, and the branch pipe 2 is sealed. Although it is necessary to remove the accumulated additive 4 when cutting the melt, which causes inefficiency, the provision of two ring-shaped burners eliminates this problem.

As described above, in the second embodiment, the branch pipe 2 and the joint 13 are
At the same time, the branch pipe 2 is heated with the core length of the first ring-shaped burner 100a to semi-melt the additives attached to the inner surface, and the branch pipe 2 is further heated with the core length of the second ring-shaped burner 100b. 2 is fully heated to completely fluidize the additives attached to the inner surface. -i to evaporate and move all the additives from the branch tube to the arc tube, and the first ring-shaped burner 100a
The arc tube 1 and the branch tube 2 are sealed, melted, and shaped with a core length of . In addition, a heat-retaining section is installed to prevent the additive 4 from re-solidifying and remaining in the branch pipe 2, and when the additive is reliably and efficiently encapsulated, the coprecipitated branch pipe can also be removed. This also makes it possible to automate the work.

Incidentally, in the second embodiment, all the cylindrical burners 14 are provided above the burner body 15, but since it is sufficient to keep the upper part of the branch pipe 2 at a temperature at which the evaporated additive does not adhere again υ, each ring-shaped burner 100a , if the rise in combustion gas of 100b is sufficient, cylindrical burner 1 can be removed by installing something like a cylindrical cover.
4 may not be provided, and if the branch pipe 2 is short, neither the cylindrical burner 14 nor the cylindrical cover is necessary.

It goes without saying that the present invention can be applied not only to the sealing of arc tubes, but also to buttons that seal one end of a cylindrical object after successively heating it in the longitudinal direction.

〔Effect of the invention〕

As described above, according to the present invention, the ring-shaped ring is used to transfer additive substances from the inside of the exhaust branch pipe to the arc tube, and to completely seal the arc tube and the exhaust branch pipe. , these steps can be performed continuously and efficiently. In addition, by moving the ring-shaped par f relative to the exhaust branch pipe in the axial direction, uniform heating can be achieved, thereby preventing additive substances from remaining in the exhaust branch pipe or reducing the additive substances. Prevent it! 0
: Can be done.

[Brief explanation of drawings]

FIG. 1 and FIG. 2 are explanatory diagrams of each process according to the first embodiment of the present invention, FIG.
B) is an explanatory diagram of each conventional process, FIGS. 5 and 6 are a perspective view of the ring-shaped burner according to the present invention and a perspective view showing the ignition state, and FIGS. 7(3) to (C) are respectively The elliptical top view, vertical side view, and vertical front view of the ring-shaped burner according to the present invention, and FIGS. 8 to 14 are explanatory views of each process according to the second embodiment of the present invention, respectively. 1.94 arc tube, 2... branch pipe for exhaust, 3... exhaust device, 4... additive substance, 9... arc tube with branch pipe, 100
, 100a. 100b...Ring burner. Note that the same reference numerals in the figures indicate the same or corresponding parts. Agent Masuo Oiwa (Fig. 1) 1: Enbi, pipe 3: Main side Tokan ℃ komin 12: Mr. Kiyo Fushiba and 9: Ne branch)
F↑Into light 114: Throat direction 11 100: I>B ° Wood bar °-su//l; Combustion power...Zu talk I virtue Fig. 2 Fig. 3 Fig. 4 "' 2 Figure 4 (B) Figure 5 Figure 6 Figure 7 109X' Figure 8 Figure 9 Figure 10 Figure 1/Figure 12 Figure 13 Figure 14

Claims (3)

[Claims] (1) The arc tube to which the exhaust branch pipe is welded is evacuated, the additive material is introduced into the arc tube, and the additive material is heated and sublimated within the arc tube, and then cooled and condensed on the inner surface of the exhaust branch pipe. The exhaust branch pipe is sealed so as to confine the additive substance to the arc tube side, and then a combustion gas collective flow is formed below, and the additive is added by heating with a ring-shaped burner whose axis is approximately aligned with the exhaust branch pipe. Move the substance from the exhaust branch pipe to the arc tube,
The method for manufacturing a metal vapor discharge lamp arc tube further comprises sealing the arc tube from the exhaust branch pipe by heating the ring-shaped burner. (2) The method for manufacturing a metal vapor discharge lamp arc tube according to claim 1, characterized in that the number of ring-shaped burners is one. (3) The method for manufacturing a metal vapor discharge lamp arc tube according to claim 1, characterized in that two ring-shaped burners are stacked one on top of the other.