JP2000331606A - Manufacture of discharge lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a discharge lamp sufficiently resistant to high tube wall load lighting condition without deterioration the lamp efficiency by performing the welding of the fused end part of a discharge vessel to the circumferential surface of a block body in the state where the internal pressure of the discharge vessel is lower than the external pressure. SOLUTION: In the state where the terminal end of a primary-side welding block tube 12A is opened, a primary-side welding block body 20 is inserted to the primary- side welding block tube 12B from its opening, and the terminal end of the block tube 12A is closed. After the block body 20 is fixed to the block tube 12A, the opening of the secondary-side welding block tube 12B of a discharge vessel 10 is connected to an evacuating device 50 through a sealing O-ring 40 and a seal jig 41. The circumference of the block tube 12A is heated by use of acid hydrogen torch 51 while evacuating the discharge vessel 10, and the non-conductive part consisting of substantially 100% silica of the block body 20 is welded to the quartz glass of the block tube 12A. In welding, a contracting force is generated by the difference between the internal pressure of the discharge vessel 10 and the external atmospheric pressure of the discharge vessel 10 so that the block tube 12A can be airtightly welded to the block body 20, and the primary welding is completed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for manufacturing a discharge lamp, and more particularly to a method suitable for a discharge lamp having a short arc length.

[0002]

2. Description of the Related Art Conventionally, as disclosed in JP-A-10-106498, a discharge vessel is made of quartz glass, and a sealing portion is formed by crushing both closed tube portions of the discharge vessel to form one end of each electrode. And a conductor foil connected to each of the outer lead wires is embedded. Generally, molybdenum foil is used as the conductor foil.

[0003] The bulb has a small exhaust chip protruding from a hollow elliptical arc tube. This exhaust chip exhausts the inside of the arc tube portion through a small-diameter exhaust tube protruding from the outer surface of the arc tube portion of the bulb, while introducing a discharge medium such as a metal halide, mercury, or a rare gas into the arc tube portion, Thereafter, the root portion of this exhaust pipe is heated by a burner flame or the like to be blown, and at the same time, is a mark after chipping to weld and airtightly open the opening.

[0004]

In the conventional discharge lamp manufacturing technique, since the above-mentioned exhaust chip remains on the outer surface of the discharge portion, the discharge tube portion has a small inner volume of 0.4 to 2.3 cc. Since the thickness is larger than the thickness of the arc tube portion, the heat capacity is increased, and it is easy to receive a thermal shock locally.

When the height and the like of the exhaust chip are relatively large with respect to the arc tube portion, a large thermal shock is applied, the pressure resistance of the exhaust chip is reduced, and cracks are easily generated.

When the discharge lamp is operated at a high load with a point light source, high brightness, and high efficiency, the exhaust chips cannot withstand the internal pressure of the lighting, and cracks and the like occur. Reliability decreases.

Also, the presence of the exhaust chip has a shadow on the light output of the discharge lamp generated from the arc tube portion, and has been a factor of greatly reducing the lamp efficiency.

Further, the sealing portion of the discharge lamp in the prior art is manufactured by burying a molybdenum foil connected to one end of each electrode and each outer lead wire by crushing both closed tubes of the discharge vessel. Therefore, variations in the inner volume of the arc tube due to deformation of the arc tube during crushing and variations in the arc length due to the eccentricity and inclination of each electrode are large. There has been a problem that variations in the properties, brightness, color temperature, and color rendering properties are naturally large.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to perform a hermetic welding of a discharge lamp without providing an exhaust chip, thereby reducing a lamp efficiency without lowering the lamp efficiency. This discharge lamp is reliable enough to withstand the lighting conditions of the tube wall load, and reduces arc length variations due to deformation of the arc tube part and eccentricity and inclination of each electrode during hermetic welding. An object of the present invention is to provide a method of manufacturing a discharge lamp in which variations in lamp performance such as lamp voltage, startability, brightness, color temperature, and color rendering are small.

[0010]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a discharge vessel made of a non-conductive material, wherein a pair of electrodes are opposed to each other, and a discharge vessel is provided at an end of the discharge vessel. In a method of manufacturing a discharge lamp in which a closure for hermetically sealing a vessel is inserted, an end of the discharge vessel is melted by a heating means, and the melted portion of the end of the discharge vessel and an outer peripheral surface of the closure are welded. A welding step is provided, and the welding step is performed in a state where the pressure inside the discharge vessel is lower than the pressure outside the discharge vessel. Preferably, the inside of the discharge vessel is set to a negative pressure or a vacuum during the welding step.

According to the present invention, during welding, a contracting force is generated due to a differential pressure between the inside and outside of the discharge vessel, and it is possible to easily apply a mechanical force from the outside of the discharge vessel and crush it without using a large-scale apparatus. The hermetic welding of the discharge vessel and the closure can be performed.

The closing body contains a conductive component and a non-conductive component having a coefficient of thermal expansion closer to the material of the discharge vessel than the conductive component, and the electrode is fixed to the inner end side, preferably. By using a material having a larger ratio of the conductive component to the non-conductive component on the outer end side of the closing body than on the electrode side, welding between the discharge vessel and the closing body becomes stronger.

Further, by forming the closing body into a column shape in accordance with the cylindrical closing pipe, it is possible to eliminate the deformation of the discharge vessel portion at the time of hermetic welding.

[0014] In a preferred embodiment, the plug is heat treated in a hydrogen atmosphere between 800 ° C and 1200 ° C prior to the welding step, so that the lamp is assembled before the lamp is assembled.
It is possible to reduce an oxidized portion of the closed body and, for example, a tungsten electrode and an outer lead wire provided in the closed body, and to remove organic substances and the like attached as impurities.

In the welding step, the filling gas in the discharge vessel may be one of helium, neon, argon, krypton, xenon, radon, and a halogen gas, or a mixed gas of two or more gas types. For example, it is possible to prevent the conductive material of the closing body and the tungsten electrode and the outer lead wire provided in the closing body from being oxidized by heat during welding.

As an embodiment of the heating means, by using an oxyhydrogen torch or a plasma torch, for example, at a temperature of 1200.degree.
The above can be achieved.

In another aspect of the present invention, the relative position of the heating means and the discharge vessel is changed during the welding step, preferably by moving the discharge vessel or the heating means along the circumferential direction of the discharge vessel. In addition, it is possible to uniformly heat the welded portion, and it is possible to prevent variations in the inner volume of the discharge vessel due to deformation of the airtight vessel, and prevent eccentricity and inclination of the electrode provided in the closing body.

According to still another aspect of the present invention, a pair of electrodes are opposed to each other in a discharge vessel made of a non-conductive material, and both ends of the discharge vessel are used to hermetically seal the discharge vessel. In the method for manufacturing a discharge lamp into which a closure is inserted, one end of the discharge vessel is melted by a heating means, and the first welded portion is welded to the melted portion of the discharge vessel and the outer peripheral surface of the first closure. And a second welding step of melting the other end of the discharge vessel by the heating means and welding the melted portion of the other end of the discharge vessel and the outer peripheral surface of the second closing body. 1. During the second welding step, the discharge vessel and the first
Before the second welding step by including a removing step of removing impurities on the surface of the closing body, and a preparing step of changing the atmosphere of the discharge vessel to an inert gas without touching the atmosphere after the removing step. This makes it possible to remove impurities such as OH groups attached to the discharge vessel and the closing body.

In the removing step, heat treatment is performed at a degree of vacuum of 10 ^-4 torr or more and at a temperature of 900 ° C. to 1200 ° C. for 2 hours or more. It is preferable that the discharge vessel is placed in a closed vessel filled with gas.

In the preparatory step, mercury and a metal halide are put into the discharge vessel through an opening at the other end of the discharge vessel.
Thereafter, the second closing member is inserted into the other end of the discharge vessel, positioned, and further connected to an opening / closing valve that can be opened / closed at the opening at the other end of the discharge vessel. It can be taken out of the sealed container filled with the inert gas.

By this means, it is possible to put a desired amount of mercury or metal halide as a luminescent substance into a discharge vessel,
The second closing body can be adjusted to a desired arc length by inserting the second closing body and fixed in the discharge vessel.

By connecting an on-off valve to the opening of the discharge vessel, the luminous substance and arc length adjusted inside the discharge vessel and the second closed body that has been fixed are adjusted from the inside of the closed vessel. When it comes out, it does not come into contact with the atmosphere again, preventing contamination of OH groups and the like in the atmosphere.

Further, the atmosphere of the discharge vessel in the preparation step may be made to contain an argon gas having an oxygen concentration of 10 ppm or less and a dew point of -70 ° C. or less. Can be filled.

Thus, the lamp member after the heat treatment can be prevented from being contaminated by impurities such as OH in the sealed container. The second blocking body does not come into contact with the atmosphere, and can prevent contamination from OH groups and the like in the atmosphere.

According to another aspect of the present invention, a pair of electrodes are disposed opposite to each other in a discharge vessel made of a non-conductive material, and both ends of the discharge vessel are closed to hermetically seal the discharge vessel. In a method for manufacturing a discharge lamp in which a body is inserted, a discharge vessel having a first closing body welded to one end is prepared, and a luminescent substance and a second closing body are inserted into the discharge vessel in an inert gas atmosphere. After that, an opening / closing valve that can be opened / closed is connected to the opening at the other end of the discharge vessel, a preparation step of closing the opening / closing valve to make the discharge vessel air-tight, and an exhaust gas that is opened and connected to the opening / closing valve. The device discharges gas from the discharge vessel and then closes the on-off valve.The on-off valve is opened, and the discharge vessel is filled with a discharge rare gas by an air supply device connected to the on-off valve. Closing the filling process and
With the on-off valve closed, the heating device melts the other end of the discharge vessel, and the inner peripheral surfaces of the other end of the discharge vessel are welded to each other,
Airtight process for hermetically sealing the discharge vessel, the rare gas required for starting the discharge lamp can be set to a desired gas pressure without contaminating the inside of the discharge vessel with atmospheric impurities. It becomes possible.

In the evacuation step, the gas is evacuated for at least 10 seconds at a degree of vacuum of 10 ^-3 torr or more with the on-off valve closed, and then the on-off valve is opened to evacuate the inside of the discharge vessel to 10 ^-3.
At least 10 seconds or more are evacuated at a degree of vacuum of not less than torr.
It is preferable to fill the rare gas for discharge with a value of 00 torr.

The rare gas for discharge is preferably one of helium, neon, argon, krypton, xenon, radon, and a halogen gas, or a mixed gas of two or more gas types.

According to still another aspect of the present invention, a pair of electrodes are opposed to each other in a discharge vessel made of a non-conductive material, and both ends of the discharge vessel are used to hermetically seal the discharge vessel. The method for manufacturing a discharge lamp in which the closures are inserted includes a welding step of melting an airtight end of the discharge vessel by heating means and welding a molten portion of the discharge vessel end and an outer peripheral surface of the closure. At the same time, by performing this welding step while cooling the discharge vessel, mercury and metal halide present in the discharge vessel are affected by heat applied from the outside when welding the ends of the discharge vessel. The solid or liquid state is maintained without evaporating and increasing the pressure inside the discharge vessel, and the vessel is sealed in the discharge vessel. Also,
Similarly, the rare gas in the discharge vessel does not expand due to heat applied from the outside.

In a preferred embodiment, the welding step is performed on a discharge vessel containing a luminescent substance and a rare gas for luminescence after the welding of the first closing body to one end is completed. At least one end of the discharge vessel is immersed in liquid nitrogen, and the other end of the discharge vessel is melted by heating means, and the melted portion of the other end of the discharge vessel is welded to the outer peripheral surface of the second closing body. Thereby, a pressure difference between the inside and outside of the discharge vessel can be easily generated.

Another preferred embodiment includes a welding step in which after the airtight step, the other end of the discharge vessel is melted by a heating means and the melted portion of the other end of the discharge vessel is welded to the outer peripheral surface of the closing body. By cutting the portion of the discharge vessel welded in the airtight step, the outer lead wire provided on the closing body is taken out of the discharge vessel, so that the outer lead wire is provided on the closing body from the outside. Power can be supplied to the electrodes.

Further, if the cut portion of the other end of the discharge vessel is the same as the end of the other end of the discharge vessel or is located on the electrode side from the end of the other end of the discharge vessel, Since the end portion is present inside the discharge vessel, the closure is not directly subjected to external force or impact. Therefore, when the optical axis of the discharge lamp and the reflector is aligned in a later step, the damage of the closing body can be prevented.

[0032]

Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a longitudinal sectional view when welding the primary side of the present invention. In FIG. 1, the arc tube 11 of the discharge vessel 10 made of quartz glass has a spherical shape or an elliptical spherical shape, and closed tubes 12A and 12B are connected to both ends of the arc tube 11. A closing body 20 made of a functionally graded material is adjusted and installed at a predetermined position inside the closing tube 12A on the primary welding side as shown in the figure.

In this embodiment, an arc tube 11 having a maximum diameter of 9 mm, a closed tube 12 having an outer diameter of 6.3 mm and an inner diameter of 2.2 mm are used.
A quartz glass discharge vessel 10 composed of A and 12B was used.

The closing body 20 made of the functionally graded material is a mixture of a non-conductive component and a conductive component of the same material as the discharge vessel 10.

In the present embodiment, since the discharge vessel 10 is made of quartz glass, the closing body 20 is made of a non-conductive component of silica and a conductive component of molybdenum and sintered.
The mixing ratio is continuously changed in the length direction so that one end is made non-conductive and the other end is made conductive.

The non-conductive end face 21 of the closing body 20 is substantially made of 100% silica, and the conductive end face 22 is made of silica 7.
It has a composition of 0% + molybdenum 30% (volume ratio) and has a columnar shape with an outer diameter of 2.1 mm and a length of 25 mm, but the composition ratio is not necessarily limited to this. Further, the mixing ratio may be changed stepwise in the length direction.

Holes are formed from both end faces 21 and 22 of the closing body 20 made of the functionally graded material to portions having conductivity, respectively, and the core rod 31 and the outer lead wire 34 of the electrode are inserted and fixed in each hole. This makes it possible to electrically connect the core rod 31 and the outer lead wire 34.

In this embodiment, the core rod 31 of the anode 30
And the outer lead wire 34 is made of tungsten,
The gap between the holes of the closing body 20 is filled with a conductive cermet (not shown) made of tungsten and silica.

The core rod 31 is filled with cermet.
And the outer lid wire 34 is fixed to the closing body 20, and also has a function of preventing cracking of the closing body 20 due to a difference in linear expansion coefficient when the discharge lamp is turned on and improving reliability of the electric conductive portion.

Therefore, it is necessary to optimize the cermet composition by the combination of the outer diameter of the core rod 31 and the outer lead wire 34 made of tungsten and the inner diameter of the hole of the closing body 20.

In order to fix the closing member 20 to the closing tube 12A, a fixing guide 35 made of molybdenum is previously connected to the outer lead wire 34 by spot welding. In addition, the material and the fixing method of the fixing guide 35 are not limited to the present embodiment.

First, FIG. 1 shows a state in which the closing body 20 is inserted from the opening of the closing tube 12A with the terminal end being opened, and then the closing end of the closing tube 12A is closed.

Blockage tube 12 for welding the primary side in advance
The closing body 20 may be inserted from the closing tube 12B which is opened by using the discharge vessel 10 having the terminal A closed. The closed body 20 is subjected to a heat treatment at 800 ° C. for 20 minutes in a hydrogen flow.

A closing pipe 1 for welding the closing body 20 on the primary side.
After fixing to 2A, the opening of the closing tube 12B of the discharge vessel 10 is connected to the vacuum exhaust device 50 via the sealing O-ring 40 and the sealing jig 41.

After the inside of the discharge vessel 10 reaches 10 ^-6 torr by the vacuum evacuation device 50, the inside of the discharge vessel 10 is heated from the outer periphery of the closed tube 12A using the oxyhydrogen torch 51 while the inside of the discharge container 10 is evacuated to a vacuum. The silica of the body 20 welds almost 100% of the non-conductive portion and the quartz glass of the closed tube 12A.

At the time of welding, a contracting force is generated by a pressure difference between the pressure inside the discharge vessel 10 and the atmospheric pressure outside the discharge vessel, so that the closed pipe 12 is closed.
The airtight welding of the occlusion tube 12A and the occlusion body 20 can be easily performed without using a large-scale device that mechanically applies a force from the outside of A and crushes, thereby completing the primary welding.

Next, when the oxygen concentration is 0.1 ppm or less, the dew point
In a vacuum furnace connected to a glove box filled with 95 ° C. argon gas, the discharge vessel 10 having completed the primary welding and the closing body used for welding the secondary side are sealed at a degree of vacuum of 10%.
Heat treatment was performed at ^-6 torr and a treatment temperature of 1170 ° C. for 12 hours.

As shown in FIG. 2, after the completion of the heat treatment, the discharge vessel 10 in which the welding on the primary side has been completed and the closing body used for the welding on the secondary side are moved into a glove box (not shown) without being exposed to the atmosphere. From the opening of the closed tube 12B of the discharge vessel 10, 140 mg of mercury and 140.0 mg of mercury bromide.
The secondary-side welding closing body 23 provided with the cathode 32 electrode is fixed to the inside of the closing tube 12B by a fixing guide 37 welded to the outer lead wire 36 so that the arc length becomes 3 mg and the arc length becomes 1.3 mm. did.

Thereafter, in the glove box, the opening of the closing tube 12B of the discharge vessel 10 is connected to the on-off valve 44 via the sealing O-ring 42 and the sealing jig 43, and the on-off valve 4
The discharge vessel 10 was taken out of the glove box in a state where 4 was closed.

In this state, even if the discharge vessel 10 comes into contact with the atmosphere, the interior of the discharge vessel 10 is not polluted by the atmosphere because it is isolated from the atmosphere.

The inside of the discharge vessel 10 is filled with argon gas having an oxygen concentration of 0.1 ppm or less and a dew point of -95 ° C.
It is filled at atmospheric pressure.

Next, as shown in the vertical sectional view of FIG. 2, the discharge vessel 10 is connected to the exhaust device 50 with the open / close valve 44 closed, and first, the connection between the open / close valve 44 and the exhaust device 50 is established. The portion (not shown) is evacuated by the exhaust device 50 until a vacuum degree of 10 ^-6 torr is reached, and the opening / closing valve 44 is opened, and the inside of the discharge vessel 10 is exhausted by the exhaust device 50 until the vacuum degree of 10 ^-6 torr is reached. did.

Since the inside of the discharge vessel 10 has reached 10 ^-6 torr, the gas is continuously exhausted for 10 minutes. Thereafter, the exhaust of the exhaust device 50 is stopped, and the gas in another system is placed in the discharge vessel 10 maintained at a high vacuum. 100 argon gas from the filling device 52
Torr filling and the opening / closing valve 44 is closed. With the open / close valve 44 closed, as shown in the vertical sectional view of FIG. 2, the closing pipe 1 between the closing body 23 for secondary welding and the exhaust device 50.
2B was partially heated with an oxyhydrogen torch 51 and sealed.

The sealed discharge vessel 10 is filled with a liquid nitrogen 54 filled in a vessel 53 as shown in a vertical sectional view of FIG.
Is installed at a position where part or all of the arc tube 11 is immersed. A jig and the like for installation at that time are not shown.

With the arc tube 11 sufficiently cooled, the secondary-side welded portion shown in FIG.
2B, the silica of the closing body 23 is almost 10%.
The non-conductive portion of 0% and the quartz glass of the closed tube 12B are welded.

At the time of heat welding, the discharge vessel 1
0 is sufficiently cooled, so that the mercury 13 and the mercury bromide 14 sealed in the discharge vessel 10 do not vaporize and contract due to the pressure difference between the pressure inside the discharge vessel 10 and the atmospheric pressure outside the discharge vessel. The sealing tube 12B and the closing body 23 can be easily air-tightly welded without using a large-scale device that mechanically applies a force from the outside of the closing tube 12B to crush it, and completes the welding on the secondary side. I do.

Finally, as shown in the longitudinal sectional view of FIG. 4, at the position where the end portions of the closing members 20 and 23 are present inside the closing tubes 12A and 12B, the discharge vessel 1 where the welding on the secondary side is completed.
0 by cutting the closed tubes 12A and 12B and putting the outer lead wires 34 and 36 out of the discharge vessel 10,
A discharge lamp without an exhaust chip is completed.

Although this discharge lamp is a mercury discharge lamp having a short arc length to be lit by direct current, the method of manufacturing the discharge lamp of the present invention is not limited to this, and may be a metal halide lamp or a xenon lamp. You may. Further, a discharge lamp of a long arc type or a discharge lamp for AC lighting may be used.

The performance of the discharge lamp manufactured under the above described manufacturing method and manufacturing conditions is as follows: lamp power DC 180 W, lamp voltage DC 85 V, arc length 1.3 mm, total luminous flux 1
1340Lm, color temperature 10400 ^○ K, color rendering index number 7
0Ra, and the mercury lamp performance in an ultra-high pressure state was obtained. FIG. 5 shows the spectral distribution of the discharge lamp.

[0060]

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a primary side welding method.

FIG. 2 is a longitudinal sectional view of a method for sealing off a secondary side welding occlusion tube.

FIG. 3 is a longitudinal sectional view of a secondary side welding method.

FIG. 4 is a completed view of a discharge lamp according to the present invention.

FIG. 5 is a spectral distribution characteristic diagram of a discharge lamp manufactured by the manufacturing method of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Discharge vessel 11 Arc tube 12A Primary-side fusing closure tube 12B Secondary-side fusing closure tube 13 Mercury 14 Mercury bromide 20 Primary-side fusing closure 21 End of closure 22 End of closure 30 Anode 31 Core rod 32 Cathode 34 Outer lead wire 35 Fixing guide 36 Outer lid wire 37 Fixing guide 40 O-ring 41 Sealing jig 42 O-ring 43 Sealing jig 44 On-off valve 50 Exhaust device 51 Oxygen torch 52 Gas filling device 53 Container 54 Liquid nitrogen

Claims (22)

[Claims] 1. A pair of electrodes are opposed to each other in a discharge vessel made of a non-conductive material, and a closing body for hermetically sealing the discharge vessel is inserted into an end of the discharge vessel. The method of manufacturing a discharge lamp according to claim 1, further comprising a welding step of melting the end portion of the discharge vessel by heating means and welding a melted portion of the end portion of the discharge vessel and an outer peripheral surface of the closing body. And a method of manufacturing a discharge lamp performed in a state where the pressure inside the discharge vessel is lower than the pressure outside the discharge vessel. 2. The method for manufacturing a discharge lamp according to claim 1, wherein the inside of the discharge vessel is set to a negative pressure or a vacuum during the welding step. 3. The closing body contains a conductive component and a non-conductive component having a coefficient of thermal expansion closer to the material of the discharge vessel than the conductive component, and the electrode is fixed to an inner end side. The method for manufacturing a discharge lamp according to claim 1 or 2, wherein 4. The method for manufacturing a discharge lamp according to claim 3, wherein a ratio of a conductive component to a non-conductive component is larger at an outer end side of the closing body than at the electrode side. 5. The method of manufacturing a discharge lamp according to claim 1, wherein the closed body is subjected to a heat treatment in a hydrogen atmosphere at a temperature of 800 ° C. to 1200 ° C. before the welding step. Method. 6. The filling gas in the discharge vessel at the time of the welding step is one of helium, neon, argon, krypton, xenon, and radon, or a mixed gas of two or more of the gas types. A method for manufacturing a discharge lamp according to any one of claims 1 to 5, characterized in that: 7. An apparatus according to claim 1, wherein an oxyhydrogen torch or a plasma torch is used as said heating means.
7. The method for manufacturing a lamp according to any one of items 6 to 6. 8. The method for manufacturing a discharge lamp according to claim 1, wherein a relative position between said heating means and said discharge vessel is changed during said welding step. 9. The method according to claim 8, wherein, during the welding step, the discharge vessel or the heating means is moved along a circumferential direction of the discharge vessel. 10. A pair of electrodes are opposed to each other in a discharge vessel made of a non-conductive material, and a closing body for hermetically sealing the discharge vessel is inserted into an end of the discharge vessel. A method of manufacturing a discharge lamp, comprising: a welding step of welding a melted portion of the discharge vessel end and an outer peripheral surface of the closing body using heating means for melting the discharge vessel end. A method for manufacturing a discharge lamp, wherein a relative position between the heating means and the discharge vessel is changed during a process. 11. A pair of electrodes are opposed to each other in a discharge vessel made of a non-conductive material, and plugs for hermetically sealing the discharge vessel are inserted into both ends of the discharge vessel. A first welding step of melting one end of the discharge vessel by heating means and welding the melted portion of the one end of the discharge vessel and the outer peripheral surface of the first closing body; A second welding step of melting the other end of the discharge vessel by heating means and welding the melted portion of the other end of the discharge vessel to the outer peripheral surface of a second closing body; A removing step of removing impurities on the surface of the discharge vessel and the first closing body without contacting the atmosphere during the second welding step; and after the removing step, the discharge is performed without contacting the atmosphere. Inert gas atmosphere in the container A method for manufacturing a discharge lamp, comprising: 12. The removing step includes performing a heat treatment at a degree of vacuum of 10 ⁻⁴ torr or more and at a temperature of 900 ° C. to 1200 ° C. for 2 hours or more. The method for manufacturing a discharge lamp according to claim 11, wherein the method is performed by disposing the discharge vessel in a closed vessel filled with argon gas as a gas. 13. In the preparing step, mercury and a metal halide are put into the discharge vessel through an opening at the other end of the discharge vessel, and then the second closing body is inserted into the other end of the discharge vessel. Positioning, further connecting an openable / closable valve to an opening at the other end of the discharge vessel, closing the open / close valve to make the discharge vessel airtight, and filling the inert gas with the sealed vessel. The method for producing a discharge lamp according to claim 11, wherein the discharge lamp is taken out of the discharge lamp. 14. The atmosphere of the discharge vessel in the preparation step has an oxygen concentration of 10 ppm or less and a dew point of -70.
2. The method according to claim 1, wherein the gas contains an argon gas at a temperature of not more than ℃.
14. The method for manufacturing a discharge lamp according to any one of 1 to 13. 15. The method according to claim 14, wherein the discharge vessel taken out of the closed vessel is filled with about 1 atm of argon gas. 16. A pair of electrodes are opposed to each other in a discharge vessel made of a non-conductive material, and plugs for hermetically sealing the discharge vessel are inserted into both ends of the discharge vessel. In a method for manufacturing a discharge lamp, a discharge vessel having a first closure body welded to one end is prepared, and a luminescent material and a second closure body are inserted into the discharge vessel in an inert gas atmosphere. A step of connecting an openable / closable valve to the opening at the other end of the discharge vessel, and a preparation step of closing the open / close valve to make the discharge vessel airtight; and opening the open / close valve and connecting to the open / close valve Exhausting the inside of the discharge vessel by using the exhaust device, and then exhausting the on-off valve; and opening the on-off valve, and supplying a rare gas for discharge into the discharge vessel by an air supply device connected to the on-off valve. Fill, then open and close A filling step of closing the valve, in a state where the on-off valve is closed, the other end of the discharge vessel is melted by a heating device, and the inner peripheral surfaces of the other end of the discharge vessel are welded to each other to make the discharge vessel airtight. A method for manufacturing a discharge lamp, comprising: an airtight step. 17. The method according to claim 17, wherein the evacuation process is performed at a pressure of at least 10 ^-3 torr with the on-off valve closed.
The gas is evacuated for at least 10 seconds and then the on-off valve is opened, and the inside of the discharge vessel is evacuated for at least 10 seconds at a degree of vacuum of 10 ^-3 torr or more.
17. A discharge rare gas is filled with a value of r.
A method for producing the discharge lamp as described in the above. 18. The discharge rare gas is one of helium, neon, argon, krypton, xenon, radon, and a halogen gas, or a mixed gas of two or more of the above gas types. Claim 16
Or a method for manufacturing a discharge lamp according to item 17. 19. A pair of electrodes are opposed to each other in a discharge vessel made of a non-conductive material, and plugs for hermetically sealing the discharge vessel are inserted into both ends of the discharge vessel. A method for manufacturing a discharge lamp, comprising the steps of: fusing the end of the discharge vessel in an airtight state by heating means; and fusing the melted portion of the end of the discharge vessel and the outer peripheral surface of the closure. The method of manufacturing a discharge lamp, wherein the welding step is performed while cooling the discharge vessel. 20. The welding step, wherein the welding of the first closing body to one end is completed, and the welding step is performed on the discharge vessel containing a luminescent substance and a rare gas for luminescence. With the one end of the vessel immersed in liquid nitrogen, the other end of the discharge vessel is melted by heating means,
20. The method for manufacturing a discharge lamp according to claim 19, wherein the melted portion at the other end of the discharge vessel is welded to an outer peripheral surface of a second closing body. 21. A welding step of melting the other end of the discharge vessel by heating means after the airtight step, and welding the melted portion of the other end of the discharge vessel to the outer peripheral surface of the closing body; 17. The lamp manufacturing method according to claim 16, wherein a portion of the container welded in the airtight step is cut. 22. A cut portion of the other end of the discharge vessel is the same as an end of the other end of the discharge vessel, or is located closer to the electrode than an end of the other end of the discharge vessel. A method for manufacturing a discharge lamp according to claim 21.