JPH01134836A - Manufacture of metal vapor discharge lamp - Google Patents

Abstract

PURPOSE:To use a ceramic pipe to a light emitting tube and enhance the yield of sealing works without damaging a frit ring by arranging No.1 metal cross-bar at the outside of the cap of metal lead, welding it with an electrode with a specified outside dia. at the end of a light emitting body situated below at the time of sealing, and by consolidating in a single piece with the cap. CONSTITUTION:A ceramic pipe is used to the light emitting tube 1 of a metal vapor discharge lamp, and an electrode 4a is welded with a metal lead 3a, and a No.2 metal cross-bar 9 with a length 1.2D (D is outside dia. of electrode 4a) is welded, followed by insertion in a cap 2a, and a No.1 metal cross-bar 5a is welded fast to the outside of the cap 2. A frit ring 7 with the inside dia. approx. 1.1 is intruded therein and placed on the metal cross-bar 9, and frit 8a for tube, the light emitting tube 1, etc., are set. The frit ring 7 is prevented from cracking when sealing is carried out, and existence of a metal cross-bar 9a enables use of frit ring 7 with comparatively large inside dia.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a method for manufacturing a metal vapor discharge lamp, and in particular to a method for manufacturing a metal vapor discharge lamp, particularly a method for sealing the arc tube of a metal vapor discharge lamp such as a high-pressure sodium lamp that uses a ceramic tube as the arc tube. It is about how to wear it.

[Conventional technology]

Metal vapor discharge lamps of this type, such as high-pressure sodium lamps, that use ceramic tubes for their arc tubes have been widely used in recent years because of their high efficiency.

Such ceramic tubes are similar to quartz glass.
Since it does not have a so-called glass state when softened by heating, conventionally, when manufacturing arc tubes, it is common to use high melting point glass frit as a solid sealant and heat seal it in a vacuum or in glass. Met.

That is, as disclosed in Japanese Patent Publication No. 60-46509, for example, as shown in FIG. 2, which shows a cross section of the set state when the arc tube is sealed, metal lead-in wires 3 are provided at both the upper and lower ends of the arc tube 1, respectively. .3a and the cap 2.2a equipped with the electrodes 4, 4a are set with the tube frit 8.8a and the cap frit 6 placed thereon.
For example, in the case of the upper part, each frit glass 8.6 is attached to a cap 2 by heating and melting in vacuum or gas.
It is poured between the ends of the arc tube 1 and the cap 2 and the metal lead-in wire 3 to seal them.

(Problems to be Solved by the Invention) However, when setting the arc tube 1 having the conventional configuration as described above in a sealing process, there are the following problems, particularly in the lower part.

That is, the frit filling the space between the lower metal lead-in wire 3a and the character 12a is set and removed as follows.

3 and 4 are cross-sectional explanatory diagrams showing two examples of conventional methods for assembling the lower part of the arc tube. First, as shown in FIG. 3, the electrode 4a is welded to the metal introduction 113a. In front, connect the metal lead-in wire 3a to the cap 2a, and connect the metal horizontal bar 5a to the cap 2a.
In this way, a metal lead-in wire 3a is fixed to a cap 2a. After that, the frit ring 7 for the metal lead-in wire is inserted, and then the electrode 4a is welded.

If the inner diameter of the metal lead-in wire frit ring 7 is excessively larger than the diameter of the metal lead-in wire 3a, the cap 2a
The molten glass will not flow properly into the hole, and therefore,
Normally, the inner diameter of the frit ring 7 is approximately the same as the diameter of the metal lead-in wire 3a, and has to be smaller than the diameter of the electrode 4a. For this reason, the frit ring 7 for metal lead-in wire
In this case, it was necessary to push the electrode 4a into the metal lead-in wire 3a before welding it, and the frit ring 7 was easily damaged at this point.

Alternatively, as shown in FIG. 4, an electrode 4a and a metal lead-in wire 3a may be welded together and fitted into the cap 2a together with the frit ring 7, but as shown in FIG. Since it was necessary to attach the metal horizontal bar 5a for the purpose, the frit ring 7 was easily damaged at this point. As described above, the conventional method shown in FIG. 3 or 4 has a problem in that the frit ring 7 is easily damaged.

This invention was made in order to solve the problems of the conventional examples as described above, and its purpose is to provide a method for easily sealing the frit ring with the arc tube without damaging the frit ring. There is.

[Means for solving problems]

Therefore, in the present invention, in the sealing step of vacuum heating the ceramic arc tube with a glass frit and sealing the cap, the ceramic tube, and the metal lead-in wire, a first metal horizontal line is placed on the outside of the cap of the metal lead-in wire. When the rod is arranged and the outer diameter of the electrode at the end of the arc tube located on the lower side during sealing is D, the electrode is welded to the metal lead-in wire in advance and integrated with the cap. By adopting a method in which a second metal horizontal bar with a dimension longer than D is welded to the base of the metal lead-in wire on the end surface, a frit ring with an inner diameter larger than D is fitted from the electrode side, and then a sealing process is performed. ,
This aims to achieve the above objective.

[Effect]

By the method with the above structure, the frit ring on the lower side of the arc tube can be accurately positioned without damaging it, and thus the sealing yield of the arc tube can be improved.

〔Example〕

The present invention will be explained below based on examples.

FIG. 1 is a cross-sectional side view of the main part of the lower end of the arc tube showing an embodiment of the assembly method of the present invention, and the same (equivalent) components as in FIGS. 2 to 4 of the prior art example of serious crime are represented by the same symbols .

(Assembling process) First, the electrode 4a was welded to the metal introduction wire 3a, and the second metal horizontal bar 9 according to the present invention having a length of about 1.20 (D is the outer diameter dimension of the electrode 4a) was welded. is inserted into the cap 2a, and the first metal horizontal bar 5a is welded to the outside of the cap 2a to fix it.

A frit ring 7 with an inner diameter of 1.1D is pushed into this and placed on the metal horizontal bar 9, and a tube frit 8a and an arc tube 1 etc. are placed on it as shown in the second fence. It is something to set. (In addition, each dimension 1.
1D, 1.2D, etc. are exaggerated from actual scale. ) By adopting the above process, firstly, the frit ring 7 will not crack;
Further, due to the presence of the metal horizontal bar 9, even when the frit ring 7 having a relatively large inner diameter is melted, it can appropriately flow into and fill the hole in the cap 2a.

(Effects of the Invention) As described above, according to the present invention, it is possible to easily seal the frit ring to the arc tube in an appropriate manner without damaging the frit ring. The sealing yield of ceramic arc tubes can be improved.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional explanatory view of essential parts showing an embodiment of the method for assembling the lower end of an arc tube according to the present invention, and FIG. 2 is a cross-sectional view showing a set state when sealing a conventional arc tube. 3 and 4 are sectional explanatory views of main parts showing two examples of conventional methods of assembling the lower part of an arc tube, respectively. In the figure, 1 is an arc tube, 2, 2a are caps, 3, 3
a is the metal lead-in wire, 4.4a is the electrode, 5.5a is the first metal horizontal bar, 6.7 is the frit for the metal lead-in wire, 8.8a is the frit for the tube, and 9 is the second metal horizontal bar. be. In each figure, the same reference numerals represent the same or equivalent components.

Claims (1)

[Claims] In a sealing process in which the ceramic arc tube is vacuum heated with a frit to seal the cap, the ceramic tube, and the metal lead-in wire, a first metal horizontal bar is disposed outside the cap of the metal lead-in wire, and during sealing. When the outer diameter dimension of the electrode at the end of the arc tube located on the lower side is D, the electrode is welded to the metal introduction wire in advance and integrated with the cap, and then the metal introduction at the end surface of the cap is performed. A metal vapor release method characterized in that a second metal horizontal bar longer than dimension D is welded to the base of the wire, a frit ring having an inner diameter larger than dimension D is fitted from the electrode side, and then a sealing process is performed. Method of manufacturing electric lights.