JP2002093361A - High pressure discharge lamp and method of manufacturing the same - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To extend the lamp life of a high pressure discharge lamp. SOLUTION: An arc tube portion 1 in which a light emitting substance 6 is sealed in a tube, a side tube portion 2 extending from the arc tube portion, and one end is arranged in the arc tube portion 1, and a part of the side tube portion 2 is provided. A high-pressure discharge lamp including an electrode rod 3 provided therein. The electrode rod 3 is substantially made of tungsten, and at least one of copper oxide and copper is provided on at least a part of the side tube part 2 of the part (10) where a part of the electrode rod 3 is located. There is an area 7 that includes.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to a high-pressure discharge lamp having a pressure higher than the atmospheric pressure and a method for manufacturing the same.

[0002]

2. Description of the Related Art FIG. 14 shows an example of the configuration of a conventional high-pressure discharge lamp. The high-pressure discharge lamp shown in FIG. 14 has an arc tube part 50 and a side tube part 51 extending from the arc tube part 50. The tip of an electrode rod 52 is located inside the arc tube part 50, and a part of the electrode rod 52 and a metal foil 53 electrically connected to the electrode rod 52 are located inside the side tube part 51. , An external lead wire 54 electrically connected to the other end of the metal foil 53.
Is provided.

[0003] In the arc tube section 50, mercury or metal halide, which is a luminous species 56, is sealed. The electrode rod 52
The side tube portion 51 is substantially made of quartz glass, and is substantially made of tungsten.
Since the tungsten of the electrode rod 52 and the quartz glass of the side tube portion 51 have different coefficients of thermal expansion, it is very difficult to seal these two types of materials. Therefore, the thin metal foil 53
Is plastically deformed to seal it with quartz glass, thereby maintaining the airtightness in the arc tube part 50.

Although the electrode rod 52 and the side tube portion 51 seem to be sealed, in fact, the gap 5 is very small.
There are five. It is known that the light-emitting species 56 enters the gap 55 while the lamp is repeatedly turned on and off. Since the temperature of this very small gap 55 is lower than the temperature of the arc tube section 50 during the lighting operation, the gap 55
The luminous species 56 that has entered the evaporator vaporizes again, and the luminous tube 5
It is difficult to return to zero. As a result, the number of light-emitting species 56 present in the light-emitting tube section 50 decreases, and proper light emission cannot be obtained. Further, the luminescent species 56 passes through the gap 55 and
, The metal foil 53 and the side tube portion 51 are separated from each other. As a result, the arc tube portion 50 leaks, and the life of the lamp may be shortened.

[0005] Efforts have been made conventionally to solve such problems. For example, JP-A-10-26
Japanese Patent No. 9941 discloses a technique for attaching a tungsten coil to an electrode rod. In this technology, the coil is
The fused quartz glass is formed at a pitch that does not enter between the coil pitches when sealing is performed. According to the same publication, it is stated that by sealing the coil while pulling it toward the discharge end of the electrode rod, it is possible to prevent a gap into which a luminescent species such as metal halide or mercury enters in a portion of the electrode rod near the metal foil. Have been. In other words, when the coil is sealed in a state where the coil is pulled toward the discharge end, the coil is stretched, so that the inner diameter of the coil closer to the metal foil becomes narrower and the coil comes into contact with the outer shape of the electrode rod, and the coil pitch increases, The fused quartz glass enters between the coils, and as a result, the quartz glass comes into contact with the outer shape of the electrode rod, so that the gap into which the luminescent species enters can be closed.

[0006]

However, in the method disclosed in the above publication, although the gap into which the luminescent species enters can be closed, the difference in the coefficient of thermal expansion between tungsten and quartz glass is not taken into account. When the light is repeatedly turned off, the difference in the thermal expansion coefficient between the two cannot be absorbed, and the lamp is broken. In the above method, since the coil is tightly wound around the electrode rod, it cannot be plastically deformed like a thin metal foil.In such a state, when the lamp is turned on, the electrode rod is heated by Joule heat. It expands and, by its force, pushes the quartz glass apart, eventually destroying the lamp. In other words, the method disclosed in the above publication is not practical for a lamp that must be repeatedly turned on and off.

The present invention has been made in view of the above points, and a main object of the present invention is to provide a high-pressure discharge lamp having a longer lamp life and a method of manufacturing the same.

[0008]

According to the present invention, there is provided a high-pressure discharge lamp according to the present invention, wherein a light-emitting tube portion in which a light-emitting substance is sealed is provided, and a side tube extending from the light-emitting tube portion and substantially made of quartz glass. Part, one end is arranged in the arc tube part, and partly includes an electrode rod provided in the side tube part, wherein the electrode rod is substantially made of tungsten, and the electrode rod is formed therein. A region including at least one of copper oxide and copper exists in at least a part of the side tube portion where the part is located.

The side tube portion in the region includes at least one of the copper oxide and the copper, Vycor glass,
It is preferable to be composed of the quartz glass.

[0010] At least one of the copper oxide and the copper is added in an amount of 1% by weight to
It is preferably contained at 0% by weight.

[0011] It is preferable that the apparatus further comprises a metal foil electrically connected to the other end of the electrode rod and provided in the side tube portion, wherein the metal foil is electrically connected to an external lead wire.

In one embodiment, the side tube portion and the electrode rod in the region are in close contact with each other, and at least a part of the side tube portion in a region other than the region and the metal foil are in close contact with each other. ing.

The region is closer to the metal foil side than to the center between the end of the arc tube which is a boundary with the side tube and the end of the metal foil on the side to which the electrode rod is connected. Is preferably present.

The diameter of the electrode rod is preferably 0.3 mm or less.

In one embodiment, at least a metal halide is sealed in the arc tube as the luminous substance.

[0016] In one embodiment, the metal halide includes an indium halide.

In a method for manufacturing a high-pressure discharge lamp according to the present invention, a glass tube having an arc tube portion and a side tube portion extending from the arc tube portion and substantially made of quartz glass is prepared. Step (a), step (b) of passing an electrode rod substantially made of tungsten through a tubular structure containing at least one of copper oxide and copper, and one end of the electrode rod is connected to the arc tube. (C) inserting the electrode rod into the side tube portion so as to be located in the portion, and heating and bringing the cylindrical structure and the side tube portion into close contact with each other, whereby the copper oxide and the copper (D) forming a region including at least one of the following in the side tube portion.

In one embodiment, the tubular structure in the step (b) is a glass tube composed of at least one of the copper oxide and the copper, Vycor glass, and quartz glass.

In one embodiment, in the tubular structure in the step (b), glass powder containing at least one of the copper oxide powder and the copper powder is attached to a glass sleeve made of Vycor glass. Things.

In the step (b), the electrode rod is
One end thereof is connected to a metal foil, and the electrode rod is passed through the inside of the tubular structure so that at least a part of the metal foil is wrapped by the tubular structure. preferable.

In the step (c), the center between the end of the arc tube part which is a boundary with the side tube part and the end of the metal foil on the side to which the electrode rod is connected is more than the center. Preferably, the electrode rod is inserted into the side tube so that the tubular structure is arranged on the metal foil side.

In the present invention, since a region including at least one of copper oxide and copper is present in at least a part of the side tube portion where the part of the electrode rod is located, the side tube portion located in the region is included. The electrode rod can be satisfactorily adhered.
As a result, it is possible to prevent the encapsulated luminescent species from entering the slight gap between the electrode rod and the side tube, and as a result, to prevent leakage of the luminous tube due to separation of the metal foil from the side tube. it can. In addition, since the leak between the arc tube portion is prevented by the close contact between the side tube portion and the electrode rod located in the region,
Even if the lamp is repeatedly turned on and off, a long-life high-pressure discharge lamp that does not break down the lamp can be provided.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The inventor of the present application has studied to solve the conflicting problems of making the side tube portion of a high-pressure discharge lamp and the electrode rod adhere well and preventing the lamp from being destroyed when the lamp is used. However, when a region where copper oxide was introduced was provided in a part of the side tube portion and the side tube portion and the electrode rod were brought into close contact with each other in the region, surprisingly, the side tube portion and the electrode rod were excellently connected. Through experiments, it has been found that it is possible to adhere to each other and to prevent breakage of the lamp, and the present invention has been achieved.

An embodiment according to the present invention will be described below with reference to the drawings. In the following drawings, components having substantially the same function are denoted by the same reference numeral for simplification of description. Note that the present invention is not limited to the following embodiments.

FIG. 1 schematically shows a cross-sectional configuration of a high-pressure discharge lamp according to the present embodiment. FIG. 2 schematically shows a cross section taken along line II-II 'in FIG.

The high-pressure discharge lamp shown in FIG. 1 is a metal halide lamp containing a metal halide as the luminous substance 6, and the luminous tube section 1 in which the luminous substance 6 is sealed.
And a side tube portion 2 extending from the arc tube portion 1. The arc tube portion 1 and the side tube portion 2 are substantially made of quartz glass. That is, quartz glass is used as a main material. A pair of electrode rods 3 are arranged in the arc tube section 1 such that their tips face each other, and each electrode rod 3 is substantially made of tungsten. That is, tungsten is used as a main material.

A part of the electrode rod 3 is located inside the side tube part 2, and a part of the side tube part 2 where the electrode rod 3 is located
At least partially includes a region 7 containing at least one of copper oxide and copper. In the present embodiment, the electrode rod 3 is a tungsten rod having a diameter (rod diameter) of 0.25 mm, and one end (one end on the root side) of the electrode rod 3 is electrically connected to the metal foil 4 located in the side tube portion 2. The external lead wire 5 is electrically connected to the metal foil 4 on the side opposite to the side to which the electrode bar 3 is connected. Metal foil 4 and electrode rod 3,
The metal foil 4 and the external lead wire 5 are connected by welding. The metal foil 4 is substantially made of molybdenum, that is, is mainly made of molybdenum. The metal foil 4 and the side tube portion 2 are in close contact with each other due to the plastic deformation of the metal foil 4, thereby maintaining the airtightness of the inside of the arc tube portion 1. That is, the side tube part 2 functions as a sealing part (seal part).

The arc tube portion 1 in the present embodiment is a substantially spherical transparent container made of quartz glass, and the inside of the container is a discharge space. The central portion of the arc tube portion 1 has an outer diameter of 6.0 mm, a wall thickness of 1.6 mm, and an inner volume of 0.025 cc. Inside the arc tube part 1 (discharge space)
Has 0.13 of InI ₃ as a luminescent substance (luminescent species) 6.
mg, TlI 0.1 mg, ScI ₃ 0.16 mg,
0.16 mg of NaI and xenon gas as a starting auxiliary gas are filled at 1.4 MPa (at 25 ° C.). However, the arc tube part 1 of the present embodiment has
Hg (mercury) is not enclosed unlike the configuration shown in FIG. That is, the lamp of the present embodiment is a so-called mercury-free metal halide lamp. Of course, the present invention is not limited to the mercury-free metal halide lamp, but may be a mercury-containing metal halide lamp (mercury-containing high-pressure discharge lamp) in which mercury is sealed.

As shown in FIG. 1, there is a very small gap 8 between the electrode rod 3 and the side tube portion 2 caused by a difference in thermal expansion coefficient between the two. The gap 8 naturally occurs in the electrode sealing step. In FIG. 1, the gap 8 is shown large for easy understanding visually, but is actually so narrow that it cannot be visually observed. This gap 8 is closed by the area 7 of the side tube 2. That is, the side tube portion 2 located in the region 7 containing at least one of copper oxide and copper and the electrode rod 3 are in close contact with each other.

The side tube portion 2 where the region 7 is located is made of, for example, an acid.
Copper oxide and Vycor glass (Corning) mixed
This is a quartz glass layer that has been removed. Vycor glass (Vycor gl
ass (trade name) is a mixture of quartz glass with additives
Lowered softening point, improved workability over quartz glass
Glass, whose composition is, for example, silica (Si
O _Two) 96.5% by weight, alumina (Al_TwoO_Three) 0.5 weight
%, Boron (B) 3% by weight.

In addition, do not mix Vycor glass.
The inventor of the present application has confirmed by experiments that the region 7 can be brought into close contact with the electrode rod 3 even when the region 7 is formed of a quartz glass layer mixed with copper oxide. In addition, in this embodiment, copper oxide was used as an additive, but when the composition analysis of the quartz glass layer in which the copper oxide was mixed was performed, it was found that copper oxide was present in the form of copper oxide in the quartz glass layer. Thus, it was confirmed that the compound was almost present in the form of copper. The reason why it is present in the form of copper in the quartz glass layer (region 7) is not clear, but probably the oxygen of the copper oxide is for some reason quartz glass (silica).
Is assumed to exist in the form of copper.

The region 7 (quartz glass layer) is provided on a part of the side tube portion 2 in the longitudinal direction, and when viewed from the appearance of the portion, black, red, or brown particles are scattered throughout the glass. It was dispersed. In this embodiment,
The region 7 exists at a position 10 near the end of the metal foil 4 on the side connected to the electrode bar 3. In other words, area 7
Is closer to the metal foil 4 than to the center between the end of the arc tube 1 (the boundary between the arc tube 1 and the side tube 2) and the end of the metal foil 4 to which the electrode rod 3 is connected. In the configuration shown in FIG. 1, the surface of the quartz glass layer (7) on the side of the metal foil 4 (the side of the external lead wire 5) and the end surface of the metal foil 4 on the side of the arc tube 1 are: They are in almost the same position. Therefore, the quartz glass layer (7) and the electrode rod 3 are in close contact with each other on the metal foil 4 side (that is, position 10) from the center. In this embodiment, the length of the electrode rod 3 located in the side tube part 2 is about 5 mm.
The length of about 1 mm of the electrode rod near position 10 is in close contact with the quartz glass layer (7).

As shown in FIG. 2, in the region 7, copper oxide (additive material; indicated by “dots” in the figure) and Vycor glass (not shown) are supplied from the electrode rod 3 to the outer wall of the side tube portion 2. In this example, more copper oxide and Vycor glass are contained near the electrode rod 3 than near the outer wall of the side tube portion 2 in this example. The side tube portion 2 (quartz glass layer) of the region 7 contains, for example, about 1 to about 30% by weight of copper oxide (or copper). If it exceeds 30% by weight, the content of the metal element becomes too large and it becomes difficult to maintain the glassy state. Therefore, the content is preferably 30% by weight or less. When the content is about 1% by weight or more, the effect of improving the adhesion can be obtained, and the content is more preferably in the range of about 5 to about 25% by weight.

FIG. 2 shows a structure in which copper oxide (or copper) and Vycor glass are unevenly distributed. However, as shown in FIG. 3, copper oxide (or copper) and Vycor glass are uniformly distributed. A distributed configuration may be used. Further, as described above, in the quartz glass layer (7),
It is sufficient that at least one of copper oxide and copper is contained, and it is not necessary that Vycor glass be contained.

In order to confirm whether or not the lamp of FIG. 1 operates without the electrode 6 of the luminescent species 6 penetrating into the metal foil 4 and without leaking, the present inventor conducted the following test. Was done.

When the lamp shown in FIG. 1 is operated at a rated power of 35 W, the estimated operating pressure is about 14 MPa.
In this test, in order to increase the load at the beginning of lighting, the power at the initial stage of lighting is about twice the rated power.
0 W was applied to the lamp for about 30 seconds. One cycle of lighting for 5 minutes and turning off for 5 minutes was defined as one cycle, and the cycle was repeated. Such an experiment was performed for each of the lamps having no region 7 in the configuration shown in FIG. As a result, in 10 lighting / lighting off cycles, the total number of lamps of the comparative example was
Intrusion of the light-emitting species 6 was observed up to the end of the metal foil 4. Further, the test was further continued, and a leak occurred in 100 light-on / light-off cycles. On the other hand, in the lamp according to the present embodiment, not only the invasion of the luminescent species 6 was not observed for all of
No leak occurred even in the 100 lighting / extinguishing cycles.

The observation of the state of the gap 8 was performed as follows. First, the lamp after the experiment was processed, and ink (new coccin / edible red 10) was injected into the arc tube part 1 with a syringe.
After injecting No. 2), ultrasonic vibration was applied while the side tube portion 2 was immersed in water to allow ink to penetrate into the narrow gap 8 and left for several hours. In the lamp of the comparative example, it was observed that ink penetrated along the electrode rod 3 up to the connection portion between the metal foil 4 and the electrode rod 3. On the other hand, in the lamp of the present embodiment, such intrusion of ink was not observed.

Next, the effect of changing the position of the region 7 (quartz glass layer) was confirmed by experiments. As shown in FIG. 4, a lamp in which the region 7 is arranged at the end of the side tube 2 on the side of the arc tube 1, and the end (the boundary between the arc tube 1 and the side tube 2) as shown in FIG. ) Was prepared at a position 1 mm away from the above (FIG. 3), and the same test as described above was performed. As a result, cracks occurred in the ones arranged at the ends, and metal halide penetrated into the metal foil 4 and leak occurred. However, those arranged at a position 1 mm apart had no cracks and no leakage.

The reason for this is presumed to be that the temperature of the region 7 increases as the position of the region 7 (quartz glass layer) approaches the arc tube portion 1 and the load caused by turning on and off increases. It appears to be. Therefore, the portion where the electrode rod 3 and the side tube 2 are in close contact (region 7) is the arc tube 1
It is preferable that the position be at least 1 mm away from the end of the side tube portion 2 on the side. The metal foil 4 is closer to the center than the center between the end of the arc tube 1 (the boundary between the arc tube 1 and the side tube 2) and the end of the metal foil 4 to which the electrode rod 3 is connected. In the area 7
It is also desirable to provide. The arc tube part 1
When the area 7 is provided at a position close to the
It would be preferable to take measures to suppress the rise in temperature of

The present inventor prepared two types of lamps in which the diameter of the electrode rod 3 was 0.4 mm and 0.3 mm, and performed the same test. In the lamp using the electrode rod 3 having a diameter of 0.4 mm, as a result of cracking, metal halide penetrated into the metal foil 4 and leak occurred. However, the lamp using the 0.3 mm electrode rod 3 had no crack and no leak. This is because as the diameter of the electrode rod 3 increases, the volume ratio between the electrode rod 3 and the side tube portion 2 increases, making it difficult to reduce the difference in thermal expansion. Therefore, the diameter of the electrode rod 3 is 0.3 m
m or less. When the diameter of the electrode rod 3 exceeds 0.3 mm (for example, 0.4 mm), the design of the side tube part 2 (particularly, the design of the volume ratio between the electrode rod 3 and the side tube part 2) is required. Considering this, it is required to design the lamp. Specifically, in the configuration shown in FIG. 1, it is preferable to increase the size of the lamp (particularly, the size of the side tube 2).

In the examples shown in FIGS. 1, 4 and 5, the region 7 is provided in the side tube portion 2 at a position which does not cover the metal foil 4, but as shown in FIG. May be set to cover the area 7. The inventor of the present application has arranged the region 7 around the end face of the metal foil 4 on the side of the arc tube section 1, and
Not only that, a lamp (see FIG. 6) in which a part of the metal foil 4 was sealed with the quartz glass layer (7) was produced, and the same test was performed on this lamp. as a result,
In the lamp shown in FIG. 6, no crack was generated, and no leak occurred. Based on this result, considering a useful advantage that the adhesion between the metal foil 4 and the side tube portion 2 is improved, a part of the metal foil 4 is also formed by the side tube portion 2 (quartz glass layer) in the region 7. Sealing is preferred.

The reason why the region 7 is provided at a predetermined position in the side tube portion 2 to prevent the occurrence of cracks in the high-pressure discharge lamp and to prevent the occurrence of leaks is not yet clear at present. Here, the thermal expansion coefficient of each part will be exemplified with reference to the cross-sectional view shown in FIG. The coefficient of thermal expansion of tungsten constituting the electrode rod 3 located at the center is about 46
× 10 ⁻⁷ / ° C., while the thermal expansion coefficient of quartz glass is about 5.5 × 10 ⁻⁷ / ° C. Side tube part 2 of area 7
Although the coefficient of thermal expansion of the (quartz glass layer) is located between the coefficient of thermal expansion of tungsten and the coefficient of thermal expansion of quartz glass, the coefficient of thermal expansion of quartz glass is approximately equal to about 7 × 10
^-7 / ° C level. The thermal expansion coefficient of quartz glass containing copper oxide (or copper) as an additive is about 7 ×
10 ⁻⁷ / ° C., and the thermal expansion coefficient of Vycor glass is about 7 × 10 ⁻⁷ / ° C. Taking these points together, it cannot be said that the thermal expansion coefficient of the side tube portion 2 (quartz glass layer) in the region 7 is close to the thermal expansion coefficient of tungsten. It is speculated that some interaction with the tungsten of the electrode rod 3 may occur, thereby preventing the occurrence of cracks and leaks when the lamp is turned on.

The effect of preventing leakage by means of providing and sealing the region 7 in a part of the side tube portion 2 is more remarkably exhibited when the luminescent species 6 is a metal halide. This is because the metal halide has a lower vapor pressure than mercury or a rare gas, and therefore, when the metal halide enters the gap 8 around the electrode rod 3, it returns to the inside of the arc tube portion 1 compared to the mercury or the rare gas. It becomes difficult.

It is known that the metal halide brings impurities such as moisture into the arc tube portion 1, and therefore, the moisture reduces the intensity of the lamp and further increases the occurrence of leakage. . Sodium halides, scandium halides, aluminum halides, lithium halides, and gadolinium halides are among the metal halides that are particularly easy to adsorb moisture. In the case of a lamp, it is more effective to apply the technology of the present embodiment.

Although the vapor pressure is lower than that of mercury, indium halide and thallium halide having a high vapor pressure among metal halides easily enter the gap 8. Further, even after squatting, the quartz glass is liable to evaporate in the gap 8 while the lamp is lit, so that the quartz glass is expanded and expanded, that is, the gap 8 is enlarged, and as a result, leakage is promoted. Therefore, in the case of a metal halide lamp in which a halide of indium or a halide of thallium is sealed, it is very effective to apply the technology of the present embodiment. In addition, in the case of mercury-free metal halide lamps, there is a strong tendency to increase the amount of metal halide enclosed compared to mercury-containing metal halide lamps. Therefore, the technology of the present embodiment is more suitable for mercury-free metal halide lamps. Applicable. In other words, in a metal halide lamp in which mercury is not sealed, it is necessary to fill more metal halides (particularly those having a high vapor pressure) as a substitute for mercury in order to set a lamp voltage or the like to a predetermined value. is there.

Next, an example of a method of manufacturing the lamp according to the present embodiment will be described with reference to FIGS.

FIG. 7 schematically shows the structure of an electrode structure (simply referred to as an "electrode") inserted into a lamp.
The electrode structure shown in FIG.
01 and an external lead wire 102, and a metal spring 103 is provided at an end of the external lead wire 102. In this embodiment, the electrode rod (tungsten rod) 100
And metal foil (molybdenum foil) 101, external lead wire 102
And the metal foil 101 are joined to each other by welding, and the electrode rod 100 and the external lead wire 102 are electrically connected via the metal foil 101. The metal spring 103 is a member for holding the electrode structure in the tube of the side tube portion, and a holding member other than the metal spring 103 may be used as long as the electrode structure can be held.

FIG. 8 shows a discharge lamp glass tube 110 prepared in another step. The glass tube 110 includes an arc tube portion 111 and a side tube portion 1 extending from both ends of the arc tube portion 111.
12 and 113. Arc tube part 111
Is a hollow, substantially spherical portion formed by heating and expanding a part of a cylindrical quartz glass tube into a predetermined shape, while the side tube portions 112, 113 are formed with an arc tube portion 111. This is the part of the quartz glass tube other than the part. FIG.
The discharge lamp glass tube 110 shown in FIG.
1 and the side tube portions 112 and 113 are formed so as to form a depression. The diameter of the side tube portions 112 and 113 in this embodiment is 4 mm in outer diameter and 2 mm in inner diameter. The side tube portion 112 is open, and the side tube portion 11 is open.
One end of 3 is closed.

FIG. 9 schematically shows a glass cylinder 120 made of at least one of copper oxide and copper, Vycor glass, and quartz glass. The glass cylinder 120 in the present embodiment is a glass sleeve (glass beet tube) in which quartz glass, Vycor glass, and copper oxide are mixed. The content of copper oxide in the glass sleeve 120 is, for example, about 1 to about 30% by weight, preferably about 5 to about 30% by weight.
About 25% by weight. Note that a glass sleeve 120 in which Vycor glass is not mixed may be used. FIG.
Has an outer diameter of 1.5 mm and an inner diameter of 0.5 mm. The length is 1 mm.

First, after passing the glass sleeve 120 through the electrode rod 100 of the electrode structure, the electrode structure (100 to 103) is inserted from the side tube portion 112 as shown in FIG. More specifically, the electrode structure (100 to 1)
03) is inserted by pushing in using an insertion rod (not shown) sufficiently smaller than the inner diameter of the side tube portion 112.
At this time, the electrode structure is fixed by contact between the metal spring 103 and the inner wall of the side tube portion 112. The electrode structure was inserted while observing with a CCD, and the electrode rod 100 and the glass sleeve 120 were arranged at predetermined positions.

Next, in this state, the inside of the glass tube 110 is evacuated. Although not shown in FIG. 10, the glass tube 110 is held by a rotatable chuck, and then the glass tube 110 is rotated, for example, in the direction of arrow 122. Thereafter, while the inside of the glass tube 110 is evacuated, the vicinity 121 of the end of the side tube portion 112 whose end is not yet sealed is heated and sealed. FIG. 10 is a diagram showing a portion 1 near the end of the side tube portion 112.
21 schematically shows a configuration in a sealed state.

Subsequently, the pipe 110 is rotated by a rotatable chuck.
Is held, for example, as shown in FIG.
The glass tube 110 is rotated in the direction of 30 and the side tube portion 112 where the electrode rod 100, the metal foil 101, etc. are located.
Portion 132 is heated and melted.
12 is hermetically sealed. At this time, the glass sleeve 120
Also melts in the same manner as the quartz glass material of the side tube portion 112,
It is in close contact with the electrode rod 100. Thereafter, the heating is stopped and the product is allowed to cool naturally. During this natural cooling, the quartz glass and the electrode rod 10
The part where 0 is in close contact is due to the difference in the amount of shrinkage between the two.
The adhesion between the quartz glass and the electrode rod 100 is peeled off, and a very small gap ("8" in FIG. 1) is formed. However, electrode rod 1
In the part where 00 and the glass sleeve 120 are in close contact,
No gap (8) is possible. This may be one of the reasons that the difference in thermal expansion coefficient between tungsten and quartz glass was mitigated by the glass sleeve 120 containing Vycor glass and copper oxide, but no clear reason is currently known. .

Through the above steps, one electrode was sealed in the arc tube. The portion of the glass sleeve 120 containing Vycor glass and copper oxide has the structure shown in FIG.
The appearance was such that black particles were dispersed throughout.

Next, as shown in FIG. 12, the electrode structures (100 to 103) are also inserted into the other side tube portion 113. Specifically, in the configuration shown in FIG.
After the end of the closed side tube portion 113 is cut with, for example, a cutter, a metal halide or the like (135), which is a light emitting material of the lamp, is sealed from the opening thereof, and then the same as described above in this state The electrode structure (100 to 1
03) is inserted. Thereafter, as shown in FIG. 12, the inside of the glass tube 110 is exhausted again.

Subsequently, the glass tube 110 is held by a rotatable chuck (not shown), and then the glass tube 110 is rotated, for example, in the direction of arrow 136. Next, after the inside of the glass tube 110 is evacuated, a predetermined amount of xenon gas that has been dried is introduced, and then the vicinity 137 of the end of the side tube portion 113 is heated and sealed.

Finally, the electrode structure is sealed to the side tube portion 113 in the same manner as in the step of hermetically sealing the side tube portion 112 shown in FIG. However, at this stage, since metal halide or xenon gas is sealed in the arc tube portion 111, it is preferable to perform hermetic sealing while cooling by, for example, water cooling. Then, in order to obtain a lamp similar to that of FIG. 1, the glass at the ends of the two-sided tube portions (112, 113) is cut by a cutter.
The external lead wires 102 shown in FIG. At this time, the metal spring 103 at the end of both electrode structures is
Can be removed. Thus, the lamp of the present embodiment can be obtained.

In the above embodiment, the glass sleeve 120 in which quartz glass, copper oxide, and Vycor glass are mixed is used. However, as described above, a glass sleeve made of at least one of copper oxide and copper and quartz glass is used. Alternatively, a glass sleeve made of at least one of copper oxide and copper and Vycor glass may be used.

Further, a glass sleeve made of Vycor glass having glass powder (quartz glass powder or Vycor glass powder) containing copper oxide powder physically adsorbed (adsorption by moisture, electrostatic adsorption, etc.) is used. You may. When the lamp of the present embodiment is manufactured by using a glass sleeve of Vycor glass to which glass powder containing copper oxide powder is adhered, a portion of the side tube portion 2 where the glass sleeve is inserted is used. (Area 7)
It was confirmed by the experiment of the present inventor that the red particles had an appearance in which red particles were dispersed.

Further, a glass sleeve 120 made of Vycor glass may be plated with copper and then oxidized. Alternatively, copper may be plated at a predetermined position of the electrode rod 100 and then oxidized, and a glass sleeve 120 made of Vycor glass may be disposed around the plating. In other words, the effect of the lamp of the present embodiment that the light-emitting species does not reach the metal foil and no leak or the like occurs even after repeated lighting and extinguishing is that copper oxide and Vycor glass exist around the electrode rod 100. The method is not limited to the method, and any method may be used as long as the method includes forming a region 7 including at least one of copper oxide and copper at a predetermined position of the side tube portion 2 as in the configuration illustrated in FIG.

In the above-described embodiment, as a sealing method, a method of heating and melting the inside of the arc tube portion 1 under reduced pressure, and shrinking and shrinking the outer tube of the sealing portion (so-called shrink method) is employed. Thus, the side tube portion (sealing portion) 2 having the shrink structure was manufactured, but the present invention is not limited to this. For example, as shown in FIG. 13, after the side tube portion (sealing portion) is heated and melted, the rotation of the arc tube 111 is stopped, and the sealing portion is quickly compressed by the mold 140 in the direction of the arrow 141. , Molding and sealing method (so-called pinching method)
However, the lamp of the present embodiment can be obtained without any particular problem. According to this method, since the mold is formed, it is possible to obtain an advantage that the lamp can be easily formed without variation in the shape of the sealing portion of the designed lamp.

In addition, in the above embodiment, a mercury-free metal halide lamp has been described as an example.
The present invention can be suitably applied to a mercury-containing metal halide lamp. Similarly, the arc tube portion 1 is formed by the side tube portion 2.
The present invention is also applicable to a high-pressure discharge lamp (for example, a high-pressure mercury lamp or an ultra-high-pressure mercury lamp) that makes the airtight.
In the above embodiment, the metal foil (4 or 1) is used.
01), but is not limited thereto, and is applicable to high pressure discharge lamps (metal halide lamps, mercury lamps, etc.) having no metal foil. In other words, the inside of the arc tube portion 1 can be sealed by the close contact action between the region 7 and the electrode rod 3, so that a high-pressure discharge lamp without metal foil can be formed. In the case of the configuration of the high-pressure discharge lamp without metal foil, for example, an electrode rod (3) made of tungsten extends through the side tube portion 2 to the external lead wire (5).

Although the embodiment according to the present invention has been described above, various modifications can be made by those skilled in the art, and the above description should not be construed as limiting.

[0063]

According to the present invention, at least part of the side tube portion where the electrode rod is located includes a region containing at least one of copper oxide and copper. Can be improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view schematically illustrating a configuration of a high-pressure discharge lamp according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line II-II 'in FIG.

FIG. 3 is a sectional view taken along the line II-II 'in FIG.

FIG. 4 is a cross-sectional view schematically illustrating a configuration of a high-pressure discharge lamp according to an embodiment of the present invention.

FIG. 5 is a cross-sectional view schematically illustrating a configuration of a high-pressure discharge lamp according to an embodiment of the present invention.

FIG. 6 is a cross-sectional view schematically illustrating a configuration of a high-pressure discharge lamp according to an embodiment of the present invention.

FIG. 7 is a diagram schematically showing a configuration of an electrode structure (electrode).

FIG. 8 is a cross-sectional view schematically showing a configuration of a discharge lamp glass tube 110.

FIG. 9 is a cross-sectional view schematically illustrating a configuration of a glass sleeve 120.

FIG. 10 shows a process of inserting an electrode structure and a glass tube 110.
FIG. 6 is a process cross-sectional view for describing a vacuum evacuation process in the inside.

FIG. 11 is a process cross-sectional view for describing a process of sealing the electrode structure.

FIG. 12 shows a process of inserting an electrode structure and a glass tube 110.
FIG. 6 is a process cross-sectional view for describing a vacuum evacuation process in the inside.

FIG. 13 is a process cross-sectional view for explaining sealing of the electrode structure by the mold 140;

FIG. 14 is a cross-sectional view schematically showing a configuration of a conventional high-pressure discharge lamp.

[Explanation of symbols]

 1,50,111 Arc tube part 2,51,112,113 Side tube part 3,52,100 Electrode rod 4,53,101 Metal foil 5,54,102 External lead wire 6,56,135 Luminescent species (luminous substance 7) Region (quartz glass layer) 8, 55 Gap between electrode rod and side tube 103 Metal spring 110 Glass tube for discharge lamp (glass tube) 120 Glass sleeve (glass tube) 121, 137 Heating position 122, 130, 136 Pipe rotation direction 132 Sealing position 140 Mold 141 Mold compression direction

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H01J 61/36 H01J 61/36 61/88 61/88 C (72) Inventor Hideaki Kiryu Large font in Kadoma, Osaka 1006, Kadoma Matsushita Electric Industrial Co., Ltd. AA07 AA14 CC03 CD01 DD12 EA11 EA16 EB15

Claims (14)

[Claims] 1. An arc tube portion in which a light emitting substance is sealed in a tube, a side tube portion extending from the arc tube portion and substantially made of quartz glass, and one end disposed in the arc tube portion. An electrode rod provided in the side tube portion, the electrode rod is substantially made of tungsten, and the side of the portion where the part of the electrode rod is located inside A high-pressure discharge lamp in which a region including at least one of copper oxide and copper exists in at least a part of the tube. 2. The high-pressure discharge lamp according to claim 1, wherein the side tube portion in the region is made of at least one of the copper oxide and the copper, Vycor glass, and the quartz glass. 3. The high-pressure discharge lamp according to claim 1, wherein at least one of the copper oxide and the copper is contained in the side tube portion in the region in an amount of 1% by weight to 30% by weight. 4. An electrode which is electrically connected to the other end of the electrode rod,
The high-pressure discharge lamp according to any one of claims 1 to 3, further comprising a metal foil provided in the side tube portion, wherein the metal foil is electrically connected to an external lead wire. 5. The side tube portion and the electrode rod in the region are in close contact with each other, and at least a part of the side tube portion other than the region and the metal foil are in close contact with each other. A high-pressure discharge lamp according to claim 4. 6. The metallized region is located between the center of an end of the arc tube portion which is a boundary with the side tube portion and the end of the metal foil on the side to which the electrode rod is connected. 6. The high-pressure discharge lamp according to claim 4, which is present on the foil side. 7. The high pressure discharge lamp according to claim 1, wherein the diameter of the electrode bar is 0.3 mm or less. 8. The high-pressure discharge lamp according to claim 1, wherein at least a metal halide is sealed as said luminescent substance in said arc tube part. 9. The high-pressure discharge lamp according to claim 8, wherein the metal halide includes a halide of indium. 10. A step (a) of preparing a glass tube having an arc tube portion and a side tube portion extending from the arc tube portion and substantially made of quartz glass; (B) passing an electrode rod made of tungsten through a tubular structure containing at least one of copper oxide and copper, so that one end of the electrode rod is located in the arc tube part;
Step (c) of inserting the electrode rod into the side tube portion, and heating and bringing the cylindrical structure and the side tube portion into close contact with each other to form a region containing at least one of the copper oxide and the copper. A method for manufacturing a high-pressure discharge lamp, comprising a step (d) of forming the side tube portion. 11. The cylindrical structure according to claim 10, wherein the cylindrical structure in the step (b) is a glass tube made of at least one of the copper oxide and the copper, Vycor glass, and quartz glass. Of manufacturing a high-pressure discharge lamp. 12. The cylindrical structure in the step (b) is obtained by adhering glass powder containing at least one of the copper oxide powder and the copper powder to a glass sleeve made of Vycor glass. A method for manufacturing a high-pressure discharge lamp according to claim 10. 13. In the step (b), the electrode rod has one end connected to a metal foil, and the electrode rod is wrapped by the tubular structure so that at least a part of the metal foil is wrapped by the tubular structure. The method for manufacturing a high-pressure discharge lamp according to any one of claims 10 to 12, wherein an electrode rod is passed through the inside of the tubular structure. 14. The method according to claim 1, wherein in the step (c), a center between an end of the arc tube part which is a boundary with the side tube part and an end of the metal foil on the side to which the electrode rod is connected is provided. 14. The method of manufacturing a high-pressure discharge lamp according to claim 13, wherein the electrode rod is inserted into the side tube so that the tubular structure is also arranged on the metal foil side.