JP2556134B2 - Method for manufacturing metal vapor discharge lamp - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for manufacturing a metal vapor discharge lamp, and more particularly to a method for sealing an end portion of an arc tube using a high melting point metal foil as a conductor.

[Conventional technology]

FIG. 4 is a perspective view showing a conventional method for sealing the end portion of the arc tube, which is disclosed in, for example, JP-A-60-81733.

In FIG. 4, reference numeral 1 is a cylindrical main tube made of a heat-resistant transparent material such as quartz glass, 2a and 2b are chucks, 3 are exhaust tubes, 4 is an inert gas introducing tube, and 5 is an electrode assembly. The electrode assembly 5 is an electrode which is sealed on at least one side of the cylindrical main tube 1 through a core wire portion 6a of the main electrode 6 and a sealing foil 7a made of a high melting point metal such as molybdenum or the like connected to the main electrode core wire 6a. (Outer lead) 8a, and an electrode (outer lead) 8b sealed by an auxiliary electrode 10 and a sealing foil 7b connected to the auxiliary electrode 10, which is a structure. Further, 9 is a holder for the electrode assembly 5, 11a and 11b are oxyhydrogen flame burners respectively, 12 is a closing plug, 13a and 13b are a pair of first pressing bodies whose pinch surfaces are substantially U-shaped, 14a Reference numerals 14b denote second pressing bodies that suppress the displacement of the electrode structure 5, respectively.

 Next, the operation of this conventional example will be described with reference to FIG.

First, a cylindrical main pipe 1 for sealing made of quartz glass or the like, in which an exhaust pipe 3 made of quartz glass or the like is welded in a substantially orthogonal manner to its central portion, is sandwiched by chucks 2a and 2b and positioned. A holder 9 for the electrode assembly 5 is arranged substantially at the center of the lower end opening of the cylindrical main pipe 1 so that the electrode assembly 5 can be inserted therein. The electrode structure 5 includes a main electrode 6 composed of a stainless steel wire or the like and an auxiliary electrode 10 which is used as required, and sealing foils 7a and 7a such as molybdenum foil.
Outer leads 8a, 8b made of molybdenum wire, etc. via b
It is configured in advance in a state of being connected to.

Then, the electrode assembly 5 inserted into the lower end of the cylindrical main pipe 1 is positioned at a predetermined position by the holder 9. On the other hand, an inert gas introducing pipe 4 is connected to the exhaust pipe 3, and nitrogen gas or the like is injected into the cylindrical main pipe 1 through the exhaust pipe 3,
Further, a closure plug 12 made of stainless steel or the like having a projection on the lower bottom surface is fitted into the upper end opening to close the upper end opening.

This is because the electrode structure 5 is oxidized and burned out by high temperature heating when the cylindrical main pipe 1 is heated and crushed and sealed by filling the inside of the cylindrical main pipe 1 with nitrogen gas or the like and flowing out from the lower end opening. This is to prevent this and to form a desired sealing shape (bulge) at the time of crushing and sealing. In such a state, for example, the planned sealing portion of the cylindrical main tube 1 is heated by the oxyhydrogen flame burners 11a, 11b, etc., and at the stage of being sufficiently softened, the portion facing the surface of the sealing foils 7a, 7b is A pair of first pressing bodies 13a, 13 whose pinch surfaces are substantially U-shaped
By pressing with b and crushing it, a so-called pinch seal is formed, and at that moment, the second pressing bodies 14a and 14b pinch the pinch-sealed portion to suppress the movement of the glass and to position the electrode assembly 5. Suppress deviation. After that, the plug 12 at the upper end of the cylindrical main pipe 1 is removed and the vertical relationship is reversed, and the other end of the cylindrical main pipe 1 is crushed and sealed in the same manner.

[Problems to be Solved by the Invention]

As described above, in the conventional example, when the electrode assembly is sealed, when the first pressing bodies 13a and 13b press the cylindrical main pipe 1, and when the second pressing bodies 14a and 14b sandwich the lateral sides. By applying pressure, the movements of the glasses that are about to flow cancel each other out, and the flow and movement of the glasses are suppressed. Therefore, the nitrogen gas filled in the main pipe is sealed with the sealing foils 7a, 7b and the cylindrical main pipe 1.
During this period, air bubbles remain, especially in the outer edge portion which is the edge portion of the sealing foil 7a. When the lamp is turned on, the bubbles in the outer edge gradually connect with each other from the inside of the cylindrical main tube, and finally the bubbles penetrate the outer tube, leading to a disadvantage of the lamp.

The present invention has been made to solve the problems of the conventional example as described above, and when performing crush sealing with a pair of pressing bodies, the central pressing body has a main electrode core wire portion and a main electrode core wire. The central portion of the connected sealing foil is crushed, and then the remaining portion including the outer edge portion of the sealing foil is crushed and sealed by the side pressing body in order to seal the filled nitrogen gas. The purpose is to reduce the defect rate by performing stable crush sealing without leaving air bubbles on the outer edge portion of the stop foil.

[Means for solving the problem]

Therefore, according to the present invention, the main electrode core wire portion and the high melting point metal sealing foil connected to the main electrode core wire are sealed on at least one side of the cylindrical main tube made of the heat-resistant transparent material. In a method for manufacturing a metal vapor discharge lamp in which an electrode assembly having electrodes is crushed and sealed by a pair of pressing bodies, the pressing body is divided into a plurality of central and side pressing bodies, and the central pressing body By crushing the central portion of the sealing foil, then by the method for manufacturing a metal vapor discharge lamp that sequentially seals the remaining electrode assembly including the outer edge of the sealing foil with the side pressing body, the above-mentioned object is achieved. It's something you want to achieve.

[Action]

In the metal vapor discharge lamp according to the present invention, the pressing body is divided into the central portion and the side pressing body, the central portion of the sealing foil is crushed by the central pressing body, and then the outer edge of the sealing foil is sequentially pressed by the side pressing body. By sealing the rest of the electrode assembly including the parts, the bubbles in the outer edge of the sealing foil generated by the inert gas in the main pipe are degassed.

〔Example〕

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

Drawing FIG. 1 is a perspective view showing a method of manufacturing a metal vapor discharge lamp according to an embodiment of the present invention, FIG. 2 is a side view showing the operation of this embodiment, and FIG. 3 is an operation of this embodiment. FIG. 3A is a lateral cross-sectional view showing the operation state of the central pressing body, and FIG. 3B shows the operation state of the side pressing body.

In FIG. 1 of the drawings, the same or corresponding constituent elements as in the above-mentioned conventional example are represented by the same symbols, and duplicate explanations are omitted.

Further, 13c and 13d are the pressing bodies 13a and 13b of the conventional example.
It is a central portion pressing body divided from, and crushes the central portion of the sealing foil 7a. Reference numerals 13a and 13b respectively denote side pressing members divided in the same manner as described above, and after the center portion of the sealing foil is crushed, the remaining electrode assembly 5 including the outer edge portion of the sealing foil is sequentially sealed. It is a pressing body that stops.

Further, the central portions of the side pressing bodies 13a, 13b are the central pressing bodies 13c, 13d, respectively, and the central pressing body 1
The 3c and 13d are configured to move forward separately from the side pressing bodies 13a and 13b, respectively.

Next, the operation of this embodiment will be described with reference to FIGS.

In FIG. 1 of the drawings, the operation up to heating the portion to be sealed of the cylindrical main pipe 1 with the oxyhydrogen flame burners 11a and 11b is the same as that of the conventional example, and therefore the duplicated description is omitted.

As described above, at the stage where the planned sealing portion is heated by the oxyhydrogen flame burners 11a, 11b, etc. and sufficiently softened, the central portion pressing body
The central portions of the main electrode core wire 6a and the sealing foil 7a are crushed and sealed by using 13c and 13d to fix the main electrode core wire 6a and the sealing foil 7a (FIG. 3 (A)). Next, as shown in FIG. 3 (B), the nitrogen gas filled for being crushed and sealed by the side pressing members 13a and 13b is gradually pushed out from the outer edge portion of the sealing foil 7a, so that the sealing is performed. No bubbles are left on the outer edge of the foil. for that reason,
The position of the main electrode 6 does not shift, and stable crushing and sealing can be obtained without bubbles in the outer edge portions of the sealing foils 7a and 7b.

 Next, the test results of this example and the conventional example will be described.

In order to confirm the effect of this embodiment, a crushing sealing test was performed using the manufacturing method of the conventional example and this example, respectively.
I went 0 each. As a result, in the method of the conventional example, a sealing defect occurred in which air bubbles were formed in the outer edge portion of the 14 sealing foils 7a, but in the method of this embodiment, even one air bubble was formed in the outer edge portion of the sealing foil 7a. No defective sealing occurred.

According to the method for manufacturing a metal vapor discharge lamp as described above, the filled nitrogen gas does not remain as bubbles, so that the defective rate due to defective sealing can be reduced and the material cost can be reduced.

In the above description, the central portion of the sealing foil 7a connected to the main electrode core wire portion and the main electrode core wire in the central portion pressing bodies 13c, 13d is crushed and sealed in a straight line, and then the sealing foil 7a Although the case where the remaining portion including the outer edge portion is crushed and sealed is described, the central portion of the main electrode core wire portion and the sealing foil 7a connected to the main electrode core wire is crushed and sealed, and then the outer edge portion. Needless to say, the pressing body can be used in any shape as long as the remaining portion is crushed and sealed.

〔The invention's effect〕

As described above, according to the present invention, when performing crush sealing with the pair of pressing bodies, the central pressing body is connected to the main electrode core wire portion and the center portion of the sealing foil connected to the main electrode core wire. By crushing and then sequentially crushing and sealing the remaining portion including the outer edge portion of the sealing foil with the side pressing body, nitrogen gas etc. filled in the main pipe is transferred to the outer edge portion of the sealing foil. There is an effect that stable crushing sealing can be performed without remaining as bubbles, and the defect rate can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view showing a method of manufacturing a metal vapor discharge lamp according to an embodiment of the present invention, FIG. 2 is a side view showing the operation of this embodiment, and FIG. 3 is a transverse view showing the operation of this embodiment. FIG. 3A is a plan view, and FIG. 3A shows an operating state of the central pressing body, and FIG. 3B shows an operating state of the side pressing body. Fourth
The figure is a perspective view showing a conventional method of sealing the end portion of the arc tube. 1 …… Main tube 2a, 2b …… Chuck 3 …… Exhaust tube 4 …… Inert gas 5 …… Electrode structure 6 …… Main electrode 7a, 7b …… Sealing foil 8a, 8b …… Electrode (outer lead) 9 …… Holder 10 …… Auxiliary electrodes 11a, 11b …… Burner 12 …… Occlusion plug 13a, 13b …… Side pressing body 13c, 13d …… Center pressing body

Claims (1)

(57) [Claims] 1. A main electrode core wire portion and an electrode sealed via a high melting point metal sealing foil connected to the main electrode core wire portion on at least one side of a cylindrical main pipe made of a heat-resistant transparent material. In a method for manufacturing a metal vapor discharge lamp in which an electrode assembly is crushed and sealed by a pair of pressing bodies, the pressing body is divided into a plurality of central and side pressing bodies, and the sealing foil is formed by the central pressing body. A method for manufacturing a metal vapor discharge lamp, comprising: crushing a central part of the electrode structure, and then sequentially sealing the remaining electrode assembly including the outer edge part of the sealing foil with the side pressing body.