JP3229325B1 - High pressure discharge lamp and method of manufacturing the same - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a high-pressure discharge lamp using a ceramic discharge tube and a method for manufacturing the same.

BACKGROUND OF THE INVENTION In such a high-pressure discharge lamp, a plugging material (usually called a ceramic plug) is inserted inside both ends of a ceramic discharge tube, and each end is plugged. A through-hole is provided, through which a metal current conductor to which a predetermined electrode system is fixed is inserted. An ionized luminescent substance is sealed in the internal space of the ceramic discharge tube.
As such a high-pressure discharge lamp, a high-pressure sodium emission lamp and a metal halide lamp are known, and particularly, the metal halide lamp has good color rendering properties. By using ceramic as the material of the discharge tube,
It can be used at high temperatures.

FIG. 1 is a sectional view showing a preferred example of the structure of the end portion of such a ceramic discharge tube. Body of ceramic discharge tube 11
Is formed in a tubular or barrel shape in which both ends are narrowed, and a cylindrical end portion 12 is provided at both ends of the main body 11. Body 11
The end 12 is made of, for example, an alumina sintered body. Body
The inner surface 11a of the end 11 has a curved shape, and the inner surface 12a
Is straight when viewed in the axial direction of the main body.
A corner 36 is formed between the end portion 12 and the end portion 12. The closing member 41 is inserted and held inside the end portion 12, and the closing member 41 is
A through hole 41a is formed so as to extend in the axial direction. The elongated current conductor 5 is inserted and fixed in the through hole 41a. In the present example, the current conductor 5 has a cylindrical shape, and the ionized luminescent substance is introduced into the internal space 13 of the main body 11 through the inside surface 5a of the current conductor 5. At the outer end of the current conductor 5, a sealing portion 5b for sealing after enclosing the starting gas and the luminescent substance is provided, and the electrode shaft 7 is joined to the outer peripheral surface of the current conductor 5. .

It is necessary to seal between the plugging material 41 and the end 12 of the ceramic discharge tube and between the plugging material 41 and the current conductor 5. In a preferred example, the through hole of the calcined body of the plugging material 41 is used. Then, the current conductor 5 is inserted through the end portion 12 and the closing member 41 is inserted through the end portion 12 to manufacture an assembly, and the assembly is integrally sintered. At this time, the space between the end portion 12 and the closing material 41 and the space between the closing material 41 and the current conductor 5 are sealed by integral sintering.

In the sealing method described above, the plugging material 41 is placed in the calcined body at the end 12.
When the calcined body at the end 12 is fired without inserting the calcined body, the inner diameter of the end 12 is designed to be smaller than the outer diameter of the closing member 41. Therefore, the closing material 41 is
It is firmly clamped and held inside. Closure material 41
The same applies to and the current conductor 5. As a material of the current conductor, molybdenum, tungsten, rhenium or an alloy thereof is advantageous from the viewpoint of corrosion resistance, and an alumina ceramic is generally used as a material of the ceramic discharge tube. Also, when alumina ceramic is used as the material of the plugging material, the difference in thermal expansion between the plugging material and the current conductor becomes large. Therefore, the material of the plugging material is a composite material of alumina ceramics and the above-mentioned metal or another cermet. It is known to use

However, as a result of further study of this manufacturing method, the inventor has found the following problems. That is, at the stage of the integral firing described above, the end 12
Each of the calcined body and the calcined body of the plugging material 41 shrinks in the lateral direction in FIG. 1 (the circumferential direction of the ceramic discharge tube), and the plugging material 41 and the current conductor 5 are firmly held by the firing shrinkage. Sealed. However, at the stage of the integral firing, at the same time, the calcined body of the end portion 12 and the calcined body of the closing material 41 are
Both in the direction of arrow E (direction of the central axis of the ceramic discharge tube)
Also shrinks during firing. As a result, the closing material 41 and the end portion
12, a large thermal stress is generated between the closing member 41 and the current conductor 5 in the direction E of the center axis of the ceramic discharge tube,
Remains.

In particular, when the high-pressure discharge lamp shows excellent color rendering properties, and its coldest point is 700 ° C. or higher, if the cycle of lighting-extinguishing is repeated, the influence of the above residual stress is expanded by this heat cycle, It could lead to destruction or leakage of ionized luminescent material.

Further, in the end sealing structure as shown in FIG.
Basically, the pressure between the blocking member 41 and the current conductor 5 seals the both, but the cycle of turning on and off is repeated many times. Therefore, it is necessary to further enhance the reliability of the sealing portion. For this reason, it is necessary to develop a seal structure having high corrosion resistance and high reliability especially for metal halide.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a sealing structure for an end portion of a ceramic discharge tube, in which even if lighting-extinguishing is repeated many times, damage or destruction of each member at the end portion due to this heat cycle, leakage of ionized luminescent material. Is not to occur.

A high-pressure discharge lamp according to the present invention is a ceramic discharge tube in which an internal space is filled with an ionized luminescent substance; a closing material having at least a portion fixed inside an end of the ceramic discharge tube, wherein a through-hole is provided. A closing member provided; a current conductor with an electrode system inserted through a through-hole of the closing member; and formed to be joined to the current conductor with the closing member and the electrode system other than the through-hole. Characterized by having a sealing material layer.

Further, in the method for manufacturing a high-pressure discharge lamp according to the present invention, the object to be fired of the plugging material is manufactured, and at this time, the current conductor is inserted into the through hole of the object to be fired without interposing the component of the sealing material. Further, a ceramic discharge tube body to be fired is manufactured, and at least a part of the closing member is fixed inside an end of the fired body of the ceramic discharge tube, and a sealing material component including a sealing material component. The layer is formed so as to be in contact with the plugging material and the current conductor except for the through hole, and the fired body of the plugging material, the fired body of the ceramic discharge tube, and the sealing material component layer are sintered. .

The present inventor has studied in detail the above-described breakdown between the end of the ceramic discharge tube and the plugging material, breakage between the plugging material and the current conductor, and leakage of the ionized luminescent material. Therefore, the sealing material is not interposed between the through-hole of the plugging material and the current conductor, and the firing target of the plugging material (a calcined body, a molded body, or a degreased body) is shrunk between the two. It has been conceived that the sealing material layer is bonded to both the closing material and the current conductor without generating a large compressive stress, thereby sealing the both. As a result, a large residual stress is not generated in the direction of the central axis of the ceramic discharge tube due to firing shrinkage of the body to be fired of the plugging material. Leakage can be prevented.

In addition, when the metallized layer is used as a sealing material layer for sealing the end of the ceramic discharge tube, the corrosion resistance to ionized luminescent materials, particularly metal halide, in the ceramic discharge tube becomes extremely high, and thus the life of the ceramic discharge tube is shortened. Was found to increase significantly, and the present invention was completed.

As the current conductor, a current conductor made of various high melting point metals or high melting point conductive ceramics can be used. However, from the viewpoint of electrical conductivity, a high melting point metal is more preferable, and such a high melting point metal is more preferably one or more metals selected from the group consisting of molybdenum, tungsten, rhenium, niobium, tantalum, and alloys thereof.

Of these, the coefficient of thermal expansion of niobium and tantalum almost matches the coefficient of thermal expansion of ceramics constituting a sense of ceramic discharge, particularly alumina ceramics, but it is known that these metals are easily corroded by metal halides.

Therefore, in order to extend the life of the current conductor, it is preferable that the current conductor be formed of molybdenum, tungsten, rhenium, or an alloy thereof. However, these metals generally have a small coefficient of thermal expansion. For example, the coefficient of thermal expansion of alumina ceramics is 8 × 10 ⁻⁶ K ⁻¹ ,
Molybdenum has a thermal expansion coefficient of 6 × 10 ⁻⁶ K ⁻¹ , and tungsten and rhenium have a thermal expansion coefficient of 6 × 10 ⁻⁶ K ⁻¹ or less.

When molybdenum is used as the material of the current conductor, it is particularly preferable that at least one of La ₂ O ₃ and CeO ₂ is contained in the dredging and molybdenum in a total amount of 0.1% by weight to 2.0% by weight.

The sealing material layer may be a glass layer, but is particularly preferably a metallized layer. Here, the metallized layer is formed by forming a sealing material component layer containing a metal component at a predetermined position at the end of the ceramic discharge tube, and firing the sealing material component layer to form a sealing material and a current conductor. It can be formed so as to be bonded to both.

Here, as the metal component constituting the metallized layer,
One or more metals selected from the group consisting of molybdenum, tungsten, rhenium, niobium, tantalum and their alloys are preferred, and particularly from the viewpoint of the corrosion resistance of the metallized layer to halogen, it is composed of molybdenum, tungsten, rhenium and their alloys One or more metals selected from the group are preferred.

In this metallized layer, a ceramic component can also be contained.
Ceramics that are corrosion resistant to ionized luminescent materials are preferred, specifically, Al ₂ O ₃ , SiO ₂ , Y ₂ O ₃ , Dy ₂ O ₃ and B ₂
One or more ceramics selected from the group consisting of O ₃ are preferred. In particular, ceramics of the same type as the material of the ceramics discharge tube are preferred, and alumina ceramics is particularly preferred. The content ratio of the metal component and the ceramic component in the metallized layer is preferably 30/70% by volume to 70/30% by volume. The thickness of the metallized layer is 5 to
Preferably it is 100 μm.

It is preferable to add a binder having excellent thermal decomposability to the metallized paste for forming the metallized layer. Examples of such a binder include ethyl cellulose and an acrylic binder.

As the material of the plugging material, the same type of material as the ceramic discharge tube or a different type of material can be used. However, it is preferable to use the same type of material as the ceramic discharge tube for the portion inserted inside the end. This is because, due to this, almost no residual stress is generated between the ceramic discharge tube and the plugging material in the central axis direction of the ceramic discharge tube. However, here, the same kind of material means a material having a common base ceramic, and there is no problem even if the added components are different.

In the present invention, the plugging material may be divided into two or more portions, and includes an inner portion fixed in the end of the ceramic discharge tube and an outer portion integrated with the inner portion. Good. At this time, it is preferable that there is substantially no compressive stress from the inner portion to the current conductor. To this end, it is preferable that the diameter of the through hole in the inner portion is equal to or larger than the diameter of the current conductor. Then, a sealing material layer is formed so as to be bonded to the outer portion and the current conductor.

The outer portion and the current conductor can be brought into close contact with each other, and further, a compressive stress can be applied from the outer portion toward the current conductor.

In this way, by tightly contacting the outer portion and the current conductor, it is possible to seal between the two,
At this time, the inner part is not crimped to the current conductor. In addition, the outer portion is located outside the ceramic discharge tube, and the stress from the end is small, so that the pressure between the outer portion and the current conductor becomes excessive, causing destruction and leakage of ionized luminescent material. The risk of doing is small.

However, if a large compressive stress is applied from the outer portion toward the current conductor, cracks may occur at the time of repetition, so that a substantially large compressive stress is applied between the outer portion and the current conductor. It is preferable that this does not occur.

However, when the sealing material layer is a glass layer, there are the following restrictions. That is, when sealing is performed by a glass layer, first, the above-described plugging material is fired, and then a glass frit is provided on the end surface of the outer portion of the plugging material, and the glass frit is melted by melting the glass frit. To form However, in this step, if there is a gap between the outer portion and the current conductor or if there is substantially no compressive stress, it is difficult to position and fix the closing member and the glass frit, and The glass frit flows into the arc tube. Therefore, when the sealing material layer is a glass layer, it is preferable that the outer portion and the current conductor are brought into close contact with each other at least so as not to move easily with each other.

On the other hand, when the encapsulant layer is a metallized layer, a metallized paste is applied to the formed body or calcined body before firing the plugging material, and then the plugging material and the metallized paste are integrally fired. Therefore, there is no need for the outer portion and the current conductor to be in close contact with each other both before and after firing. For this reason, as described above, it is preferable that substantially no compressive stress be generated between the outer portion and the current conductor.

When the plugging member is a joined body of the inner portion and the outer portion, the material of the inner portion is preferably the same type of material as the ceramic discharge tube. Thereby, the inner part and the end of the ceramic discharge tube are integrated after firing.

The material of the outer portion is preferably a composite material having a coefficient of thermal expansion between the coefficient of thermal expansion of the material of the ceramic discharge tube and the coefficient of thermal expansion of the material of the current conductor. Thereby, the difference in thermal expansion between the outer portion after the integral firing and the current conductor can be reduced.

More specifically, the composite material may be a composite material of a first component having a relatively high coefficient of thermal expansion and a second component having a relatively low coefficient of thermal expansion, wherein: The first component of the composite material is preferably a ceramic of the same type as the material of the inner part and the material of the ceramic discharge tube. Thereby, the racemic component diffuses at the interface between the inner portion and the outer portion after the integral firing, and the two are firmly joined. It is particularly preferred that both the ceramic discharge vessel and the first component of the composite material constituting the outer part are alumina ceramics. This is because alumina has high corrosion resistance, and when an alumina component is contained in a composite material, usually about 1600
At a temperature of not less than ℃, the seam between the outer part and the inner part disappears due to the solid diffusion reaction at the time of sintering, and the joined part substantially forms an integral structure.

As the second component of the composite material, tungsten,
From high-melting point metals such as molybdenum and rhenium, which have corrosion resistance to metal halides, and ceramics having a low coefficient of thermal expansion, such as aluminum nitride, silicon nitride, titanium carbide, silicon carbide, zirconium carbide, titanium diboride, and zirconium diboride. , It is preferable to select.
Thereby, high corrosion resistance against metal halide can be imparted to the outer portion.

In this case, the ratio of alumina as the main component is 60 to 90.
%, And the ratio of the second component is preferably 10 to 40% by weight.

Further, it is preferable that the sealing material layer is sandwiched between the closing material and the thermal expansion reducing material provided on the opposite side of the closing material, and the sealing material layer is bonded to the thermal expansion reducing material. . When the closing member having the inner portion and the outer portion as described above is used as the closing member, the outer portion and the thermal expansion reducing material are opposed to each other.

That is, when the sealing material layer is formed on the surface of the plugging material, cracks also occur due to the difference in thermal expansion between the plugging material and the sealing material layer due to the above-described lighting-light-off heat cycle. Can occur. However, when the sealing material layer is interposed between the closing material and the thermal expansion reducing material, thermal stress is applied to both surfaces of the sealing material layer in a line-symmetric manner, and as a result, the sealing is performed by the heat cycle described above. The thermal stress concentrated near the interface between the stopper layer and the closing material is reduced, and micro cracks and the like are less likely to occur.

As a material of the thermal expansion relaxation material, a material having a thermal expansion coefficient close to or equal to the thermal expansion coefficient of a portion of the closing material that is in contact with the sealing material layer is preferable. When the closing member has an outer portion and an inner portion, the material of the thermal expansion relaxation material is preferably a material having a thermal expansion coefficient close to or equal to the thermal expansion coefficient of the outer portion. Therefore, in the latter case, it is preferable that the material of the thermal expansion moderating material is the above-described composite material, and in particular, the material of the outer portion, and the composite material having the first component and the second component in common are used. preferable.

When the closing member has an outer portion and an inner portion, an outer diameter slightly larger than the outer diameter of the current conductor made of a high melting point metal is provided between the outer portion and the thermal expansion reducing material. The sealing member layer can be formed between the annular member and the outer portion, and the sealing member layer can be formed between the annular member and the thermal expansion reducing material. In this way, by inserting the annular member between the sealing material layers, the joining with the current conductor by the sealing material becomes easy.

Also, an annular protrusion is formed on the outer peripheral surface of the current conductor, the annular protrusion is inserted between the closing member and the thermal expansion reducing material, and a sealing material layer is formed between the annular protrusion and the closing member. The sealing material layer can be formed between the annular protrusion and the thermal expansion reducing material. In this case, the following effect is further obtained in addition to the effect of the above-described annular member. In each of the sealing methods described above, it is necessary to prevent the ionized luminescent material from leaking by joining both the closing member and the current conductor with the sealing material layer.

However, since the annular protrusion is on the outer peripheral surface of the current conductor,
There is no risk that the ionized luminescent material will leak from between the annular protrusion and the current conductor. Therefore, in this embodiment, when the sealing material layer is formed between the annular protrusion and the closing member, the close contact surface (seal surface) between the sealing material layer and the annular protrusion is the center axis of the ceramic discharge tube. Since a complete seal can be obtained only by forming the seal in a plane perpendicular to the direction, the life of the seal portion is further increased.

Further, when the closing member has an inner portion and an outer portion, an annular protrusion is inserted between the outer portion of the closing member and the thermal expansion reducing material.

In this embodiment, the following sealing method is more preferable. That is, in each of the sealing methods described above, the sealing material layer is formed on the outer end surface of the closing material, and the thermal expansion relaxation material is provided outside the sealing material layer. However, when these sealing methods are adopted, a slight gap remains between the inner surface of the through hole of the closing member and the current conductor, and the two are not firmly adhered to each other. Since the ionized light-emitting substance flows into the device, the light-emitting efficiency is reduced accordingly.

However, the first plugging material is fixed to the inner space side of the end of the ceramic discharge tube, the second plugging material is fixed to the end face side of the end of the ceramic discharge tube, and the first plugging material and the second plugging material are fixed. The annular projecting portion can be inserted between the closing member and the closing member.
In this case, a sealing material layer is formed between the first closing material and the annular protrusion, and a sealing material layer is also formed between the second closing material and the annular protrusion. These sealing material layers are formed so as to extend in a plane perpendicular to the central axis direction of the ceramic discharge tube.

With this configuration, at the end of the ceramic discharge tube, the ionized light-emitting substance flows into the gap between the first plugging member and the current conductor, but does not flow further. Therefore, deterioration of luminous efficiency can be improved.

At both ends of the ceramic discharge tube, the above-described sealing method can be adopted. However, at one end of the ceramic discharge tube, it is necessary to inject an ionized luminescent substance through the inside of the current conductor. Must be tubular. At the other end, current conductors of various shapes such as a rod shape and a tubular shape can be adopted.

Here, it has been found that when the annular protrusion is provided on the current conductor, a problem occurs in the step of inserting the current conductor into the through-hole of the body to be fired of the closing material. That is, if the current conductor is straight, after the electrode system is attached to the tip of the current conductor by welding, and inserted into the through hole from the opposite end of the electrode system,
A current conductor with an electrode system can be easily mounted in the through-hole of the body to be fired of the closing material, and an assembly can be manufactured. Alternatively, only the current conductor may be metallized and fired with the plugging material, and the electrodes may be welded before final firing.

However, when an annular projection is provided on the welded electrode system, the annular projection abuts on the end face of the object to be fired when trying to insert into the through hole of the object to be fired sequentially from the opposite side of the electrode system. This makes this assembly impossible. Of course, if the diameter of the annular protrusion is reduced so that it can be inserted into the through hole, assembly becomes possible, but if the diameter of the annular protrusion is reduced, the above-described sealing portion also becomes smaller, The sealing performance of the sealing material layer is reduced. Therefore, it is preferable that the diameter of the annular projection is larger than the inner diameter of the through hole.

As a result, it is necessary to insert the current conductor from the side on which the electrode system is attached, that is, from the front end side, into the through hole of the fired body of the closing material. However, at this time, in the conventional assembling method, the electrode system was fixed to the outer peripheral surface of the current conductor by welding, but as a result, the electrode system could not be inserted into the through hole of the body to be fired, and the It turned out to hit the end face. Further, the electrode shaft of the electrode system is attached to the current conductor, and a welding method is used as the attachment method. However, since the welding material protrudes from the outer peripheral surface of the current conductor, the protruding welding material sometimes hits the end face of the fired body.

Of course, if the diameter of the current conductor is made sufficiently smaller than the inner diameter of the through-hole of the object to be fired before firing, such a problem is unlikely to occur. Therefore, this method cannot be adopted.

Therefore, the present inventor has conceived of attaching an electrode system to the inner surface of the ceramic discharge tube on the inner space side when the current conductor has a tubular shape. As a result, particularly, the raised portion of the welding material is raised toward the inner peripheral surface side of the current conductor, so that the raised portion does not collide with the end face of the fired body of the closing material. Of course, at the same time, this welding method can also bring the position of the electrode closer to the center with respect to the radial direction of the arc tube, thereby improving the lighting stability.

It has also been conceived that an electrode system is attached to the inner space side of the ceramic discharge tube of the current conductor, and the tip side of the electrode system is bent toward the central axis of the ceramic discharge tube. As a result, the electrode portion at the tip of the electrode system can be easily accommodated in the through-hole of the object to be fired.

However, when the electrode shaft of the electrode system is mounted on the inner peripheral surface of the current conductor, the welding material protrudes around the mounting portion. This bulge can also occur when a brazing material is used. When the size of the ridge increases, the flow of the ionized luminescent material may be impeded by the ridge when the ionized luminescent material is injected through the tubular current conductor.

Therefore, the inventor of the present invention has provided the current conductor with an emission port of the ionized luminescent material in front of the raised portion or the mounting portion, thereby preventing the injection of the ionized luminescent material from being hindered by the protrusion. Such an outlet may be continuous with the outlet at the tip of the current conductor, or may be formed separately.

INDUSTRIAL APPLICABILITY The present invention can be suitably applied to a high-pressure discharge lamp in which various ionized light-emitting substances are sealed, but is particularly useful for a metal halide lamp in which a highly corrosive metal halide is sealed. Is more preferably formed of alumina ceramics.

Further, in the present invention, when at least the inside of the end portion of the ceramic discharge tube of the plugging material is formed of the same material as the ceramic discharge tube, a pressure-bonding plugging material is provided outside the plugging material, and the plugging material and the pressure-bonding plugging material are provided. The current conductor is inserted into each through-hole, and the gap between the closing material and the crimp closing material and between the crimp closing material and the current conductor is sealed by a sealing material layer. A pressing force can be applied to the sealing material layer in the circumferential direction from the pressing and closing material.

In this case, as described above, the plugging material may be an integral plugging material made of the same material as the ceramic discharge tube, or a joined body of the inner portion made of this material and the outer portion. It can also be. Here, the same type of material refers to a material having a common base ceramic, for example, a cermet containing alumina as a main component, and the added components may be different.

The through-hole is formed in the crimp closing member, and the preferred material of the crimp closing member through which the current conductor passes is the same as the material of the outer portion described above, specifically, the material of the ceramic discharge tube. And the thermal expansion coefficient of the material of the current conductor.
As described above, this composite material is preferably a composite material of the first component having a relatively high thermal expansion coefficient and the second component having a relatively low thermal expansion coefficient.

Then, a metallized paste layer is provided between the object to be fired and the object to be fired, and between the object to be fired and the current conductor, respectively. The layers are fired together. At this time, each of the objects to be fired shrinks, but the current conductor does not shrink. Therefore, if the inner diameter of the fired pressure-sensitive plugging material obtained when the current conductor is not inserted into the through hole of the body to be fired of the pressure-resistant plugging material is smaller than the outer diameter of the current conductor (preferably 5 to 5). If it is reduced by about 10%), after the integral firing, a compressive stress is applied from the compression-sealing material toward the metallized layer and the current conductor. Then, it has been found that the pores in the metallized layer are reduced by the compressive stress and become closed pores, and the denseness of the metallized layer is further improved.

In this aspect, it is preferable that the above-mentioned thermal expansion relaxation material is further disposed outside the compression-sealing member, and a metallized layer is provided between the thermal expansion-reducing material and the compression-sealing member. That is, also in this embodiment, as described above, there is a possibility that cracks may also occur between the pressure-bonding closing material and the metallized layer due to the heat cycle of turning on and off as described above. However, if the metallized layer is sandwiched between the compression-sealing material and the thermal expansion-reducing material, thermal stress is applied to both surfaces of the metalized layer in a line-symmetrical manner. Thermal stress concentrated near the interface with the material is alleviated, and micro cracks and the like hardly occur.

In the present invention, when a thermal expansion relaxation material is provided, it is preferable to further form a sealing material layer in a gap between the thermal expansion relaxation material and the current conductor. Thereby, a stronger sealing material layer can be obtained.

In order to manufacture the above high-pressure discharge lamp, in the manufacturing method of the present invention, a sealing material component layer containing a component of the sealing material,
Other than the through holes, the plug is formed so as to be in contact with the object to be fired and the current conductor, and the object to be fired, the object to be fired of the ceramic discharge tube, and the sealing material component layer are sintered. At this time, as for the ceramic discharge tube, a ceramic, for example, alumina powder is extruded to obtain a cylindrical shape, or air is blown into the inside of the molded body and blow-molded, and a cylindrical shape having a bulged central portion is obtained. , And dried and degreased. On the other hand, the material of the plugging material is weighed, water, alcohol, an organic binder and the like are added, and the mixture is granulated using a spray drier or the like to produce a granular powder for molding. This is press-molded to produce a molded article of a closing material having a through hole.

Then, a current conductor is inserted into the through hole of the molded body, and the assembled body is calcined to disperse molding aids and the like,
A calcined body can be obtained. Alternatively, it is possible to calcine the above-mentioned molded body to scatter a molding aid or the like to produce a calcined body, and to insert a current conductor into a through hole of the calcined body. In these calcining steps, when a part of the plugging material is formed by cermet, such as the outer portion of the plugging material, when this is heated at 1300 ° C. to 1600 ° C. in a reducing atmosphere, the plugging material is removed. Tungsten oxide, molybdenum oxide, and the like mixed as the second component are reduced.

Next, the calcined body of the plugging material is inserted inside the end of the calcined body of the slamic discharge tube, and the ceramic discharge tube and the plugging material are integrally fired. As a result, the ceramic discharge tube and the plugging material are integrally joined. At this time, in the case where the current conductor is firmly held by the outer portion of the closing material, in the case where the current conductor is not inserted into the through-hole of the calcined body of the outer portion, the diameter after sintering after insertion is inserted. Preferably, it is 1 to 10% smaller than the diameter of the previous current conductor.
Further, when the calcined body of the plugging material is not inserted into the end of the calcined body of the ceramic discharge tube, the inner diameter of the fired end is 1 to 10% smaller than the outer diameter of the fired plugging material. It is preferable to make it smaller.

This final firing is also preferably performed in a reducing atmosphere, and the temperature is preferably 1700 ° C to 1900 ° C.
As described above, when a reducing atmosphere is used at the stage of calcination or baking, reduction of the second component, for example, tungsten in the plugging material can be advanced, and oxidation can be prevented.

The sealing material component layer is formed at a predetermined location as described above,
If necessary, a calcined body of a thermal expansion relaxation material is arranged, and integrally calcined together with a calcined body of a plugging material, a calcined body of a ceramic discharge tube, and a sealing material component layer.

At this time, when the annular projection is formed on the outer peripheral surface of the current conductor, the annular projection and the body of the closing material are opposed to each other when viewed in the central axis direction of the ceramic discharge tube, and the annular projection is closed. A sealing material component layer can be formed between the material and the object to be fired.

Further, in this aspect, when the current conductor further forms a tube, an electrode system is attached to the inner surface of the current conductor on the inner space side of the ceramic discharge tube. The electrode system is inserted into the through hole and the current conductor is fixed in the through hole. Alternatively, an electrode system is attached to the current conductor on the inner space side of the ceramic discharge tube, and the tip side of the electrode system is bent toward the center axis of the ceramic discharge tube, and then the current conductor is covered with an obstructing material. An electrode system can be inserted into the through-hole of the fired body, and the current conductor can be fixed in this through-hole.

The shape of the ceramic discharge tube can be generally tubular, cylindrical, drum-shaped, or the like. If the current conductor is tubular and the ionized luminescent substance is sealed inside the discharge tube through the current conductor, the current conductor is closed by laser welding or electron beam welding after the sealing.

In addition, a storage concave portion for storing a liquid-phase ionized luminescent substance is formed in advance on the surface of the internal space side where the plugging material is free, and a liquid metal halide or the like flows into the storage concave portion of the plugging material. be able to. That is, when lighting and extinguishing of the high-pressure discharge are repeatedly performed, at the time of lighting, most of the metal halide is in a gas phase and is distributed in the internal space of the ceramic discharge tube. However, as shown in FIG. 1, a part of the remaining liquid phase flows as shown by an arrow D, particularly toward the end portion 12 where the temperature is relatively low.
The metal halide flowing in the liquid phase has a corrosive property with respect to the ceramic discharge tube, and particularly has a corrosive property with respect to the alumina sintered body. For this reason. When an experiment in which lighting and extinguishing are repeated using a high-pressure discharge lamp for a long period of time is performed, especially the periphery of the corner 36 is corroded, and a corroded surface may be formed. Then, the metal halide in the liquid phase is easily stored along the corroded surface, so that the corrosion is more likely to progress along the corroded surface. When such corrosion is likely to occur, the life of the high-pressure discharge lamp is shortened.

However, by the above method, the liquid phase metal halide or the like preferentially flows toward the storage recess of the closing material,
It has been confirmed that it is difficult to store in the region between the main body and the end of the ceramic discharge tube, and that the corrosion of this portion is greatly reduced. However, the corrosion progresses around the recess for storing the plugging material. However, even if the plugging material itself corrodes, the thickness of the plugging material is large, so that the life of the high-pressure discharge is not adversely affected.

In this aspect, it is preferable to provide the storage recess with an inclination. Specifically, the thickness of the plugging material as viewed in the central axis direction of the ceramic discharge tube (the thickness as viewed in the direction E in which the through hole extends) is determined. It is preferable to form the storage recess so as to decrease from the corner toward the through hole. Thereby, the width of the storage recess increases from the corner toward the through hole, that is, from the periphery to the center of the ceramic discharge tube.

Further, it is preferable that the inner surface of the main body of the ceramic discharge tube and the storage recess are smoothly continuous without any step. That is, it is preferable that the corner does not appear as a step on the inner surface of the ceramic discharge tube. By adopting such a combination of shapes, it is possible to prevent the liquid-phase ionized luminescent material flowing along the inner peripheral surface of the main body from staying around the step.

The high-pressure discharge lamp according to the present invention is a ceramic discharge tube in which an internal space is filled with an ionized light-emitting substance; a plugging material that is at least partially fixed inside the end of the ceramic discharge tube, Blocking material provided with holes;
A current conductor with an electrode system inserted into the through hole of the closing material; and a metallizing layer for sealing formed to be in close contact with the closing material and the current conductor. .

The present inventor has found that sealing the end of the ceramic discharge tube with the metallized layer as described above is extremely effective against corrosion of metal halide, sodium and the like, particularly corrosion by metal halide.

The specific material of the metallized layer and various embodiments using the metallized layer as a sealing material have already been described.

However, the specific mode of using the metallized layer to seal or hermetically seal the end of the ceramic discharge tube is not limited to the above.

That is, in addition to the above-described embodiments, a metallized layer is further formed on the surface of the plugging material facing the inner space side of the ceramic discharge tube, and at least a gap between the plugging material and the current conductor is formed by the metallized layer. Can be coated so as not to communicate with the discharge tube.

Further, a metallized layer may be provided between the through hole of the plugging material and the current conductor within the end of the ceramic discharge tube.

In this aspect, the first plugging material is fixed to the inner space side of the end of the ceramic discharge tube, the second plugging material is fixed to the end face side of the end of the ceramic discharge tube, and the first plugging material is fixed. A press-fitting closure can be inserted between the second closure and the second closure. In this case, it is possible to form a sealing material layer also between the first closing material and the pressure bonding closing material, and to form a sealing material layer also between the second closing material and the pressure bonding closing material. it can. These sealing material layers are formed so as to extend in a direction perpendicular to the central axis direction of the ceramic discharge tube. According to this aspect, the gap between the crimp closing member and the current conductor is sealed by the metallized layer, and a crimping force is applied to the metallized layer between the crimp closing member and the current conductor in the circumferential direction from the crimp closing member.

Further, in this way, at the end of the ceramic discharge tube, the ionized luminescent substance flows into the gap between the first plugging member and the current conductor, but does not flow further.
Therefore, the luminous efficiency can be improved.

As described above, when pressure is applied from the pressure-bonding closing material to the metallized layer at the time of firing, the sealing characteristics are particularly improved. This is because pores are easily generated when the metallized layer is baked as it is, but when the metallized paste is baked while applying pressure to the metallized layer between the pressure-blocking material and the current conductor, the pores in the metallized layer are reduced. Because.

In this embodiment, it is preferable that the first closing member and the second closing member are made of the same material as the ceramic discharge tube, as described above.

Preferred materials for the pressure-bonding closing material are as described above.
Specifically, the coefficient of thermal expansion of the material of the ceramic discharge tube,
A composite material as described above having a coefficient of thermal expansion between that of the material of the current conductor.

When a metallized layer is formed between the current conductor and the through hole, a metallizing paste is applied to the through hole of the body to be fired of the closing material, and the current is applied to a predetermined position of the through hole to which the metallizing paste of the closing material is applied. The current conductor is fixed in the through hole by inserting the conductor and baking the metallized paste, and then the plugging material is inserted into a predetermined position on the inner surface of the end of the fired body of the ceramic discharge tube, and then integrally fired. be able to.

In this case, when the metallizing paste is fixed to the inner surface of the end portion of the ceramic discharge tube, of the two main surfaces of the plugging material orthogonal to the through holes of the plugging material, the metallizing paste becomes the outside of the ceramic discharge tube. It can also be applied to the surface. In particular,
It is preferable that the denseness of the metallized layer be further improved by penetrating the glass into the open pores of the metallized layer provided on the main surface of the plugging material after integrally firing.

In this embodiment, by providing and fixing a metallized layer between the through-hole of the plugging material and the current conductor, generation and residual of large thermal stress as viewed in the direction of the central axis of the ceramic discharge tube are eliminated, and lighting- It is possible to obtain a highly reliable high-pressure discharge lamp which does not cause damage or destruction of each member at the end portion due to a heat cycle generated by repeated light-off, and does not cause leakage of the ionized luminescent material. The metallized layer has a high corrosion resistance to ionized luminescent substances, particularly metal halides, in the ceramic discharge tube, and thus serves to prolong the life of the ceramic discharge tube. At this time, pressure due to firing shrinkage of the closing material is applied to the metallized layer,
The airtightness of the metallized layer is improved.

Further, by providing the first thermal expansion relaxation material and the second thermal expansion relaxation material on the outside and inside of the closing material, it is possible to reduce the stress generated due to the difference in thermal expansion between the closing material and the metallized layer. . In this case, in particular, the second thermal expansion relaxation material provided inside the plugging material also serves to reduce the back arc on the metallized layer by protecting the metallized layer exposed in the ceramic discharge tube.

In addition, a glass layer is provided on the metallized layer in contact with the outside air of the plugging material, and the glass is infiltrated into the open pores of the metallized structure, and the plugging material, the first thermal expansion moderating material, and the ceramic of the second thermal expansion moderating material are used. Providing a chamfer such as a C-chamfer or an R-chamfer at a corner in contact with the discharge tube is a preferable embodiment because the reliability of the sealing portion can be further improved.

As is clear from the above description, according to the present invention, the ceramic discharge tube in which the internal space is filled with the ionized luminescent substance, the closing member for sealing the end of the ceramic discharge tube, and the through-hole of the closing member are provided. In a high-pressure discharge lamp provided with a current conductor with a layered electrode system, even if it is repeatedly turned on and off, this heat cycle may cause damage, destruction, and leakage of ionized luminescent substances at the end members. A difficult and highly reliable end structure can be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing a structure around an end of a conventional ceramic discharge tube.

FIG. 2 is a schematic diagram schematically showing an example of the entire structure of the high-pressure discharge lamp.

FIG. 3 shows a high-pressure discharge lamp according to an embodiment of the present invention.
FIG. 4 is an enlarged cross-sectional view showing a structure around an end portion 12 of the ceramic discharge tube 11, in which a sealing material layer 16A is formed between an outer portion 15 of a plugging material 50A and a thermal expansion relaxation material 17. .

FIG. 4 is an enlarged sectional view showing a structure around an end 12 of a ceramic discharge tube 11 in a high-pressure discharge lamp according to another embodiment of the present invention. A sealing material layer 58 is formed between the cushioning material 17.

FIG. 5 is a cross-sectional view showing, in an enlarged manner, the structure around the end 12 of the ceramic discharge tube 11 according to still another embodiment of the present invention. An annular member 18 is inserted between them, and sealing material layers 16B and 16C are formed between them.

FIG. 6 is an enlarged cross-sectional view showing the structure around the end portion 12 of the ceramic discharge tube 11, in which the annular member 18 is inserted between the outer portion 57 of the closing member 56 and the thermal expansion reducing material 17. The sealing material layers 59A and 59B are formed between them.

FIG. 7 is a cross-sectional view showing, in an enlarged manner, the structure around the end portion 12 of the ceramic discharge tube 11 according to still another embodiment of the present invention, in which an annular protrusion 22 is formed on the outer peripheral surface of the current conductor 5. The sealing material layers 16D and 16E are formed between the outer portion 21 and the annular protrusion 22, and between the thermal expansion reducing material 17 and the annular protrusion 22.

FIG. 8 shows a high-pressure discharge lamp according to an embodiment of the present invention.
FIG. 9 is a cross-sectional view for explaining a method of manufacturing an assembly of the current conductor 23 and the fired object 51 of the closing material.

FIGS. 9A and 9B are cross-sectional views for explaining a method of manufacturing an assembly of the current conductors 24 and 28 and the fired body 51 of the closing material in the high-pressure discharge lamp according to the embodiment of the present invention. FIG.

FIG. 10 is a cross-sectional view showing, in a further enlarged manner, the structure around the end 12 of the ceramic discharge tube 11 in another embodiment of the present invention, in which an annular protrusion 22 is formed on the outer peripheral surface of the current conductor. And the current conductor and electrode system shown in FIG. 9 (b) was used.

FIG. 11 is a cross-sectional view showing, in a further enlarged manner, the structure around the end portion 12 of the ceramic discharge tube 11 according to still another embodiment of the present invention, in which an annular protrusion 22 is formed on the outer peripheral surface of the current conductor 5. The current conductor and electrode system shown in FIG. 9A was used.

FIG. 12 is an enlarged cross-sectional view showing the structure around the end portion 12 according to still another embodiment of the present invention, in which a sealing material layer is formed between a closing material 60 and a pressure-sealing material 61. Have been.

FIG. 13 is a cross-sectional view showing, in an enlarged manner, the structure around the end portion 12 according to still another embodiment of the present invention, in which a sealing material layer is formed between a closing material 63 and a pressure sealing material 64. As a result, the thickness of the compression sealing material 64 increases from the outer peripheral side toward the inner peripheral side.

FIG. 14 is a cross-sectional view showing, in an enlarged manner, the structure around the end 12 in still another embodiment of the present invention.The metallized layer 16H is provided on the surface of the inner portion 34 of the closing member 50C on the side of the internal space 13. Is formed.

FIG. 15 is a cross-sectional view showing, in an enlarged manner, the structure around the end portion 12 according to still another embodiment of the present invention.
A compression sealing material 67 is inserted between 33 and the second closing material 32, and sealing material layers 68A and 68C are formed between these members.

FIG. 16 is an enlarged cross-sectional view showing a structure around the end portion 12 according to still another embodiment of the present invention.
A compression sealing material 73 is inserted between the second closing member 71 and the second closing material 71, and sealing material layers 74A and 74C are formed between these members.

FIG. 17 is a cross-sectional view showing, in an enlarged manner, the structure around the end portion 12 in still another embodiment of the present invention, in which a metallized layer 83 is formed between the closing member 81 and the current conductor 6. .

FIG. 18 is a cross-sectional view showing, in an enlarged manner, the structure around the end portion 12 according to still another embodiment of the present invention.
A second closing member 86 is accommodated in the space inside 87.

FIG. 19 is a cross-sectional view showing, in an enlarged manner, the structure around the end portion 12 in still another embodiment of the present invention, in which a first thermal expansion moderating material 89 is fixed outside a closing member 81. , Closing material 81
A second thermal expansion moderating material 90 is fixed inside the inside.

FIG. 20 is a flowchart illustrating a process example of the manufacturing method according to the present invention.

FIG. 21 is a flowchart showing another example of the manufacturing process in the present invention.

FIG. 22 is a cross-sectional view showing the structure of the end of still another high-pressure discharge lamp, in which a plug 91 and a thermal expansion buffer 93 facing the outside of the plug 91, a thermal expansion buffer 93, Glass layers 92A and 92B are formed between the glass layer 92A and the current conductor 5.

FIG. 23 is a cross-sectional view showing the structure of the end portion of still another high-pressure discharge lamp, in which a portion between the outer portion 15 of the plugging material 50A and the thermal expansion moderator 93 facing the outer portion 15 includes a thermal expansion moderator. Glass layers 92A and 92B are formed between 93 and the current conductor 5.

FIG. 24 is a cross-sectional view showing the structure of the end portion of still another high-pressure discharge lamp, in which an outer portion 57 of a closing member 56 and a thermal expansion moderator 93 facing the outer portion 57 have a thermal expansion moderating material. Glass layers 92A and 92B are formed between 93 and the current conductor 5.

FIG. 25 is a cross-sectional view showing the structure of still another end of the high-pressure discharge lamp, in which glass layers 92A and 92B are formed, and a metallization layer 98 is formed between the plugging member 97 and the current conductor 106. Have been.

FIG. 26 shows the entirety of the sealing structure shown in FIG.
12A is sealed with a metallization layer 105.

FIGS. 27A and 27B are enlarged cross-sectional views showing the periphery of the end face of the glass layer 92A.

FIG. 28 is a flowchart illustrating a process for manufacturing the sealing structure of each embodiment as shown in FIGS.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail with reference to the drawings.

FIG. 2 is a schematic diagram showing a metal halide high-pressure discharge lamp. The ceramic discharge tube 10 is accommodated in the outer tube 2 made of quartz glass or hard glass, and the center axis of the outer tube 2 and the center axis of the ceramic discharge tube 10 are aligned.
Both ends of the outer tube 2 are hermetically closed by the base 3. The ceramic discharge tube 10 includes a barrel-shaped main body 11 whose central portion is expanded, and end portions 12 at both ends of the main body 11. The ceramic discharge tube 10 is held by an outer tube 2 via two lead wires 1, and each lead wire 1 is connected to a base 3 via a foil 4. The upper lead wire 1 is welded to a tubular or rod-shaped current conductor 6, and the lower lead wire 1 is welded to a tubular current conductor 5.

Each of the current conductors 5 and 6 is inserted and fixed in a through hole of each closing member. An electrode shaft 7 is hermetically connected to each of the current conductors 5 and 6 in the main body 11 by welding. A coil 9 is wound around the electrode shaft 7. The electrode system is not particularly limited. For example, a terminal portion of the electrode shaft 7 may be formed in a spherical shape, and the spherical portion may be used as an electrode. The structure of the closing member and the like will be described later.

In the case of a metal halide high-pressure discharge lamp, an inert gas such as argon and a metal halide are sealed in the internal space 13 of the ceramic discharge tube 10, and mercury is further sealed as necessary.

FIG. 3 is an enlarged sectional view showing the periphery of the end portion of the ceramic discharge tube shown in FIG. The inner surface 11a of the main body 11 has a curved shape, and the inner surface 12a of the end portion 12 is straight when viewed in the direction of the central axis of the ceramic discharge tube.
A corner 36 is formed between the ridge 12 and the ridge 12. The closing member 50A is inserted inside the end portion 12. This closing material 50A is
The inner part 14 is mostly housed therein and the outer part 15 is not housed in the end 12. The inner part 14 and the outer part 15 are integrated, and the through holes 14a, 15a
Also have the same central axis. The inner portion 14 and the end portion 12 are formed of the same type of ceramic, preferably alumina ceramic, and the interface between them has almost disappeared in the firing step.

An elongated tubular current conductor 5 is inserted into the through holes 14a and 15a. At the outer end of the current conductor 5,
A sealing portion 5b for sealing after enclosing the starting gas and the ionized luminescent material is provided. Current conductor 5 and outer part 15
A crimping surface 40 is formed between them. A ring-shaped thermal expansion buffer 17 is provided further outside the end surface 15b of the outer portion 15, and the end surface 15b of the outer portion and the end surface 17b of the thermal expansion buffer 17 are opposed to each other. The current conductor 5 is also inserted into the through hole 17a at the center of the thermal expansion reducing agent 17. Outer part 15
A sealing material layer 16A is sandwiched between the thermal expansion modifier 17 and the sealing material layer 16A, and the sealing material layer 16A covers the end faces 15b and 17b and a part of the surface of the current conductor 5. As a result, a sealing surface 20 in the central axis direction of the ceramic discharge tube and a sealing surface 19 in the vertical direction are formed. As the sealing material layer, a metallized layer is preferable, but a glass layer can also be used. A glass layer 42 is formed around a protruding portion of the current conductor 5 from the thermal expansion relaxation material 17.

In this embodiment, the current conductor 5 with the electrode system is inserted into the through-hole of the molded body or the calcined body of the plugging material 50A, and the molded body or the calcined body of the plugging material is formed into the molded body or the calcined ceramic discharge tube. An assembly is manufactured by passing through the end of the fired body,
The assembly is integrally sintered. At this time, the outer part 15
Is formed of a composite material or cermet comprising the material of the ceramic discharge tube 10, preferably alumina, and the above-mentioned second component.

In the case where the sealing material layer 16A is the above-described metallized layer, a paste to form the sealing material layer 16A is applied so as to form a coating layer having the shape shown in FIG. And, it is integrally fired together with the object to be fired of the ceramic discharge tube. When the sealing material layer 16A is a glass layer, the plugging material 50A
After firing the ceramic discharge tube 11 and the
A glass material (preferably glass frit) is provided between A and the thermal expansion moderating material 17, and the glass material is melted to form a glass layer.

FIG. 4 is a sectional view showing a structure of an end portion of a ceramic discharge tube according to another embodiment of the present invention. The end structure in FIG.
Since the structure is almost the same as the end structure shown in FIG. 3, the same members are denoted by the same reference numerals, and description thereof will be omitted.

In this embodiment, the plugging material 56 is a ceramic discharge tube.
It comprises an integrally fired body of an inner part 14 fixed in the end part 12 of the eleventh part and an outer part 57 exposed from the end part. The material of the outer portion is the same as the material of the outer portion 15 in FIG. The current conductor 5 is inserted into the through hole 57a of the outer portion 57. In the present embodiment, a slight clearance is provided between the surface of the through-hole 57a of the outer portion 57 and the current conductor 5, so that no compressive stress is applied to the current conductor 5. However, in FIG. 4, the clearance is slightly exaggerated.

The thermal expansion reducing material 17 is provided so as to face the end face 57b of the outer portion 57. In this embodiment, the sealing material layer
The space between the end face 57b of the outer part 57 and the end face 17b of the thermal expansion relaxation material 17 is hermetically sealed by the ring-shaped part 58a of 58. Further, the sealing material is also filled between the through hole 17a of the thermal expansion relaxation material 17 and the outer peripheral surface of the current conductor 5, and the sealing material layer
58b.

FIGS. 5, 6, and 7 are cross-sectional views showing, on an enlarged scale, the periphery of an end portion of a ceramic discharge tube according to another embodiment of the present invention. However, in each example,
3 and 4 are denoted by the same reference numerals, and description thereof may be omitted.

In the embodiment shown in FIG. 5, the current conductor 5 is inserted into the through hole of the annular member 18, and the annular member 18 is interposed between the outer portion 15 and the thermal expansion reducing material 17. And the end face of the outer part
A sealing material layer 16C was formed between 15b and the annular member 18, and a sealing material layer 16B was formed between the end face 17b of the thermal expansion relaxation material and the annular member 18. Thus, a sealing surface 19 extending in a direction perpendicular to the center axis direction of the ceramic discharge tube was formed. In addition, there is a slight gap between the annular member 18 and the current conductor 5, and the sealing material layers 16B and 16C are joined to the current conductor. I have.

In the embodiment shown in FIG. 6, the closing material 56 shown in FIG. 4 is further used. The current conductor 5 was inserted into the through hole of the annular member 18, and the annular member 18 was interposed between the outer portion 57 and the thermal expansion reducing material 17. Then, the end face 57b of the outer portion and the annular member 1
8, a sealing material layer 59A is formed, and the end face 17 of the thermal expansion relaxation material is formed.
A sealing material layer 59B was formed between b and the annular member 18. Thus, a sealing surface 19 extending in a direction perpendicular to the center axis direction of the ceramic discharge tube was formed. In addition, there is a slight gap between the annular member 18 and the current conductor 5, and the sealing material layer 59
A and 59B are joined to the current conductor, and the sealing surface 20 is also formed at the contact portion.

As described above, no compressive stress is applied between the through hole 57a of the outer portion 57 and the current conductor 5. Further, the sealing material is also filled between the through hole 17a of the thermal expansion relaxation material 17 and the outer peripheral surface of the current conductor 5, forming the sealing material layer 59C.

In the embodiment shown in FIG. 7, the closing material 50B is constituted by the inner portion 14 and the outer portion 21. The material of the outer portion 21 is the same as that described above, but in the present embodiment, the current conductor 5 inserted into the through hole 21a and the outer portion 2
1 is not tightly adhered. An annular protrusion 22 is formed on the outer peripheral surface of the current conductor 5.
Extend in a direction perpendicular to the central axis of the ceramic discharge tube. The annular protrusion 22 is inserted between the outer portion 21 and the thermal expansion reducing material 17. A sealing material layer 16D is formed between the end face 21b of the outer portion 21 and the annular projection 22, and a sealing surface 19 is formed at this portion. The sealing material layer 16E is also provided between the annular protrusion 22 and the end face 17b of the thermal expansion relaxation material.
Are formed.

In order to manufacture such an end structure, the following method is preferable. FIG. 8 is a cross-sectional view for explaining this manufacturing method, and shows a state before the current conductor 23 and the object to be fired are assembled. Both ends of the current conductor 23 are open. On the outer peripheral surface of the current conductor 23, the above-mentioned annular protrusion or flange portion 22 is formed. In the assembling stage, the current conductor 23 is inserted into the through-hole 54 of the fired body 51 of the closing material.
Need to be inserted into Here, the fired body 51 of the closing material
Are the object 52 to be fired in the inner part and the object 53 to be fired in the outer part.
It is constituted by. However, since the outer diameter of the annular protruding portion 22 is larger than the diameter of the through hole 54, first, as shown by the arrow A, the tip of the current conductor 23 is inserted into the through hole 54, and this tip portion is Project from Then the through hole
Arrow B against the tip of current conductor 23 projecting from 54
The electrode shaft 7 is welded as shown in FIG.

After integrally firing the assembly thus obtained, the ionized luminescent substance is injected into the ceramic discharge tube through the internal space 23a of the current conductor 23, and then the tip of the current conductor 23 is sealed with a laser beam or the like, A current conductor 5 is obtained. As a result, the end structure shown in FIG. 7 can be created.

However, in this manufacturing method, the electrode system is welded to the current conductor after the current conductor 23 is completely inserted into the through-hole of the body to be fired of the closing material. However, performing the above assembly after welding the electrode system to the current conductor is difficult for the reasons described above.

In this case, it is preferable to use a combination of a current conductor and an electrode system as shown in FIG.
That is, the electrode system 27 includes a linear portion 27a, a bent portion 27b, and a linear portion 27c.
Is provided. When attaching the electrode system to the current conductor 24, the linear portion 27a is attached to the inner peripheral surface 24b of the tip portion of the current conductor 24. At this time, the raised portion 26
Are formed, which may obstruct the flow of the ionized luminescent material flowing into the internal space 24a.
A discharge port 25 is formed just before. In this embodiment, the linear portion 27c is located substantially at the center axis of the ceramic discharge tube.
This assembly is inserted into the through hole 54 as shown by arrow C. After the sealing of the ionized luminescent material is completed, the outlet 25 is sealed.

As shown in FIG. 9 (b), a linear portion 27a is welded to the inner peripheral surface of the terminal portion of the current conductor 28, and a discharge port 29 is formed obliquely from the terminal portion. The ionized luminescent material can be emitted from the near side. Thereafter, when the ionized luminescent substance is sealed from the internal space 28a of the current conductor, and then the outlet 29 is sealed, an end structure as shown in FIG. 10 is formed.

The components shown in FIG. 10 are substantially the same as those shown in FIG. 7, except for the current conductor and the electrode system only.
The one shown in FIG. 9B is used. The outer end of the current conductor 28 is sealed by a sealing portion 30. The linear portion 27a of the electrode system 27 is fixed to the inner peripheral surface of the current conductor 28.

In the embodiment shown in FIG. 11, the current conductor 24 and the electrode system 27 shown in FIG. 9A were used as the current conductor and the electrode system. In the end portion 12, a first closing member 33 is fixed on the inner space 13 side, and a second closing member 32 is fixed on the end surface side. The first closing member 33 and the second closing member 32 are separated from each other, and the annular projection 22 is inserted between them. The current conductors 24 are inserted into the through holes 33a of the closing member 33 and the through holes 32a of the closing member 32, respectively. However, in these portions, the current conductor 24 is not firmly held by each closing member.

The sealing material layer 1 is provided between the annular protrusion 22 and the end surface 33b of the closing material 33.
6F are formed, and a sealing surface 19 is formed in these close contact portions so as to extend in a direction perpendicular to the center axis direction of the ceramic discharge tube. Annular projection 22 and blocking material 32
A sealing material layer 16G is formed between the end face 32b of the ceramic discharge tube and the sealing surface 19 so as to extend in a direction perpendicular to the center axis direction of the ceramic discharge tube. The outer end of the current conductor 24 is sealed by a sealing portion 30. According to such an end structure, in addition to the effects described above, the sealing surface 19 is further formed at a position close to the internal space 13, so that a gap for accommodating the ionized luminescent substance is extremely small at the end.

FIG. 12 is a sectional view showing an end structure of a ceramic discharge tube according to still another embodiment. In the present embodiment, the plugging member 60 is formed of the same material as the ceramic discharge tube 11, and a pressure bonding plugging member 61 is provided outside the plugging member 60. Each through-hole 60a, 6 of the closing member 60 and the crimp closing member 61
The current conductor 5 is inserted in 1a. End face 60 of closing material 60
The space between b and the end face 61b of the compression-sealing member 61 is hermetically sealed by a sealing material layer 62A. A sealing surface 19 extending in a direction perpendicular to the axial direction is formed by the sealing material layer 62A.

Further, there is a slight gap between the through hole 61a of the crimp closing member 61 and the outer peripheral surface of the current conductor 5, and this gap is filled with a sealing material to form a sealing material layer 62B. . A crimping force is applied to the sealing material layer 62B between the crimp closing member 61 and the current conductor 5 in the circumferential direction from the crimp closing member 61. As a result, a seal surface 20 extending in the axial direction of the ceramic discharge tube is formed between the inner peripheral surface of the pressure-bonding closing member 61 and the outer peripheral surface of the current conductor 5.

The thermal expansion reducing material 17 is further provided outside the pressure-bonding closing material 61, and the current conductor 5 is inserted into the through hole 17a of the thermal expansion reducing material 17. The gap between the end face 17b of the thermal expansion relaxation material 17 and the end face 61c of the compression sealing member 61 is also hermetically sealed by the sealing material layer 62C.

The preferable material of the pressure-bonding closing member 61 is the same as the material of the outer portion of the closing member described above. In manufacturing this end structure, in a preferred embodiment, metallization is used as a sealing material, and a metallized paste layer is provided between the fired body of the pressure-bonding closing material 61 and the fired body of the closing material 60. , Crimp closure material
A metallized paste layer is provided between the object to be fired 61 and the current conductor 5, and a metallized paste layer is provided between the pressure-blocking closing material 61 and the thermal expansion reducing material 17, and each of the objects to be fired and each metallized paste layer is provided. Bake together. During this integral firing,
Each of the objects to be fired shrinks, but the current conductor 5 does not shrink. Therefore, if the inner diameter of the fired crimp closing member 61 obtained when the current conductor 5 is not inserted into the through-hole of the body to be fired of the crimp closing material 61 is smaller than the outer diameter of the current conductor 5, After the firing, a compressive stress is applied from the compression sealing member 61 toward the metallized layer 62B and the current conductor 5. Then, it has been found that the pores in the metallized layer 62B are reduced by the compressive stress and become closed pores, and the denseness of the metallized layer 62B is further improved.

FIG. 13 is a sectional view showing an end structure of a ceramic discharge tube according to still another embodiment. The closing member 63 is formed of the same material as the ceramic discharge tube 11, and the closing member 63
A crimp closing member 64 is provided outside the box. The current conductor 5 is inserted into each of the through holes 63a and 64a of the closing member 63 and the crimp closing member 64. The space between the end face 63b of the closing material 63 and the end face 64b of the pressure-fitting closing material 64 is hermetically sealed by a sealing material layer 66A. Here, the end surface 63a of the closing member 63 is slightly inclined when viewed from a direction perpendicular to the center axis F of the ceramic discharge tube, and the end surface 64b of the pressure-bonding closing member 64 is substantially parallel to the end surface 63b. Therefore, the sealing surface 70 is formed by the sealing material layer 66A so as to extend in a direction slightly inclined from the direction perpendicular to the central axis F.

There is a slight gap between the through hole 64a of the crimp closing member 64 and the outer peripheral surface of the current conductor 5, and this gap is filled with a sealing material to form a sealing material layer 66B. The sealing material layer 66B between the crimp closing material 64 and the current conductor 5 is
From 4, a pressing force is applied in the circumferential direction. As a result, the sealing surface 20 extending in the direction of the central axis f of the ceramic discharge tube is formed between the inner peripheral surface of the pressure-bonding closing member 64 and the outer peripheral surface of the current conductor 5.

A thermal expansion reducing material 65 is further provided outside the crimp closing material 64, and the current conductor 5 is inserted into the through hole 65 a of the thermal expansion reducing material 65.
Is inserted. The gap between the end face 65b of the thermal expansion relaxation material 65 and the end face 64c of the compression sealing member 64 is also hermetically sealed by the sealing material layer 66C.

Here, the end face 64c of the compression-sealing member 64 is slightly inclined when viewed from a direction perpendicular to the center axis F of the ceramic discharge tube, and the end face 65b of the thermal expansion relaxation material 65 is substantially parallel to the end face 64c. Therefore, the central axis F
The seal surface is formed so as to extend in a direction slightly inclined from the vertical direction. Then, the compression-sealing member 64 is formed such that the thickness increases linearly from the outer peripheral side to the inner peripheral side.

The preferred material of the crimp closing material 64 is the crimp closing material described above.
The material is the same as the material of 61, and the preferred manufacturing method of the end structure in FIG. 13 is also the same as the preferred manufacturing method of the end structure in FIG. However, as shown in FIG. 13, the end surface of the compression-sealing member 64 is inclined with respect to the direction perpendicular to the center axis F of the ceramic discharge tube, so that the firing target of the sealing material 63 and the firing target of the compression-sealing material 64 are formed. A paste layer of metallized layers 66A, 66B, 66C is formed between the objects to be fired of the thermal expansion relaxation material 65 to form an integrated assembly. Also in the process, this inclination can reduce the thermal stress in the electrode axis direction and the radial direction. Further, since the position of the center axis of the assembly can be easily understood, the assembly can be easily performed.

12 and 13, the sealing material layer may be a metallized layer, and the material of the metallized layer may be a composite material of alumina and molybdenum, tungsten, rhenium, or an alloy thereof. In this case, the metallized layer 62B or 66B and the inner peripheral side of the ring-shaped metallized layer 62A or 66A near the current conductor 5 are:
The content ratio of molybdenum, tungsten, rhenium or an alloy thereof in the metallized layer can be increased, and the content ratio of alumina in the metallized layers 62A, 66A can be increased on the outer peripheral side of the metallized layers 62A, 66A. By employing such a gradient composition in the metallized layers 62A and 62B or in the metallized layers 66A and 66B, the stress applied to each part of the metallized layer by the thermal cycle can be further reduced.

Further, the metallized layer for sealing can be formed on the surface of the closing material on the side of the internal space 13. In this case,
Since the sealing surface formed by the metallized layer is formed at a position very close to the internal space 13, a gap for accommodating the ionized luminescent material is extremely small at the end. FIG. 14 is a sectional view showing such an embodiment.

The closing member 50C is constituted by the inner portion 34 and the outer portion 15. There is almost no compressive stress between the inner part 34 and the current conductor 5, but the current conductor 5
Is held by The outer part 15 is outside the end 12. The current conductor 5 is provided in the through hole 34a of the inner portion 34.
Further, the through-hole 15a of the outer portion 15 is inserted, and a glass layer 42 is formed on the end surface 15b of the outer portion 15.

A curved surface 37 is formed on the surface of the inner portion 34 on the side of the internal space 13, and the edge of the curved surface 37 is in contact with the corner portion 36, and the curved surface 37 smoothly contacts the inner surface 11 a of the main body 11. The corners 36 are continuous and do not appear as a step between the main body 11 and the curved surface 37.

This curved surface 37 has an inner surface 11
It has almost the same inclination angle as a, from which the through hole 34a
, The angle of inclination gradually approaches horizontal. As a result, a storage recess 38 is formed in the inner portion 34 or the inner space 13 side of the closing member 50C itself. The liquid-phase ionized luminescent material flowing on the inner surface 11a of the main body 11 toward the end 12 as shown by the arrow D immediately flows into the storage recess 38.

In each of the embodiments described above, a sealing material layer for gas sealing is formed in a portion other than between the through hole of the plugging material and the current conductor in the end of the main body of the ceramic discharge tube. I've been. However, as described above, a metallized layer can be formed between the current conductor and the through-hole of the plugging material in the end of the body of the ceramic discharge tube.

For example, in the embodiment shown in FIG. 15, a first plugging material 33 is fixed on the inner space side of the end portion 12 of the ceramic discharge tube 11, and a second plugging material is fixed on the end surface side of the end portion 12. 32 is fixed. The first closing member 33 and the second closing member 32 are separated from each other, and a crimp closing member 67 is inserted between the first closing member 33 and the second closing member 32. Crimp closure 67
The current conductor 5 is inserted into the through hole 67a.

The first plugging material 33 and the second plugging material 32 are made of the same type of material as the ceramic discharge tube 11, as in FIG. 11, so that each plugging material 32, 33 is in contact with the end portion 12. The airtightness of the surface is completely maintained.

A metallized layer 68C is formed between the end surface 33b of the first closing member 33 and the end surface 67b of the pressure-bonding closing member 67. A metallized layer 68A is also formed between the end surface 32b of the second closing member 32 and the end surface 67c of the pressure-bonding closing member 67. These metallization layers 6
8A and 68C are formed in the radial direction of the ceramic discharge tube 11, and the sealing surface 19 is formed to extend in this direction.

A metallized layer 68 is also provided between the crimp closing material 67 and the current conductor 5.
B is formed. The metallization layer 68B between the crimp closing member 67 and the current conductor 5 is applied with a crimping force in the circumferential direction from the crimp closing member 68 due to the firing shrinkage of the crimp closing member in the circumferential direction during firing.

In the embodiment shown in FIG. 16, a first closing member 72 is fixed on the inner space side of the end portion 12 of the ceramic discharge tube 11, and a second closing member 71 is provided on the end surface side of the end portion 12. Fixed. The first closing member 72 and the second closing member 71 are separated from each other, and the press-fit closing member 73 is inserted between these closing members. The current conductor 5 is inserted into the through-hole 71a of the closing member 71, the through-hole 72a of the closing member 72, and the through-hole 73a of the crimp closing member 73.

The first closing member 72 and the second closing member 71 are made of the same material as that of the ceramic discharge tube 11, so that each closing member
The air-tightness of the contact surface between 71 and 72 and end 12 is completely maintained. The end surface 72b of the closing member 72 is slightly inclined when viewed from a direction perpendicular to the center axis F of the ceramic discharge tube, and the end surface 73b of the pressure-bonding closing member 73 is substantially parallel to the end surface 72b. The sealing surface 70 is formed by the sealing material layer 74C so as to extend in a direction slightly inclined from the direction perpendicular to the central axis F.

The end face 71b of the plugging material 71 is also located at the center axis F of the ceramic discharge tube.
Are slightly inclined when viewed from the vertical direction, and the end face 73c of the crimp closing member 73 is substantially parallel to the end face 71B. The sealing surface 70 is formed by the sealing material layer 74A so as to extend in a direction slightly inclined from the direction perpendicular to the central axis F.

The metallized paste is also filled between the press-fit closing member 73 and the current conductor 5, and the baking forms a metallized layer 74B. Crimp closure 73 and current conductor 5
A pressing force is applied to the metallized layer 74B in the circumferential direction from the pressing / closing member 73.

17 to 19 are cross-sectional views showing still another example of the sealing structure at the end of the ceramic discharge tube shown in FIG.

In the end structure shown in FIG. 17, for example, a disc-shaped closing member 81 made of the above-described composite material (cermet) is fixed inside the end 12 of the ceramic discharge tube 10 made of Al ₂ O ₃ . ing. At the center of the closing member 81, a through-hole 82 having a circular cross section is formed. The tubular current conductor 6 made of, for example, molybdenum is accommodated in the through hole 82, and the current conductor 6 is fixed via the metallized layer 83. At the end of the current conductor 6 inside the ceramic discharge tube 10, an electrode 9 such as a coil is provided. In this example, the closing material 81
A metallized layer 84 that is continuous with the metallized layer 83 is formed on the outer main surface 81a. And the metallization layer 84
A glass layer 85 is formed thereon.

In the example shown in FIG. 17, the gap between the plug 81 and the current conductor 6 is fixed by a metallized layer 83, and the plug 81 and the ceramic discharge tube 10 are fixed.
Is fixed by a compressive force from the end 12 of the ceramic discharge tube 10 to the closing member 81 due to the difference in thermal expansion during firing. Due to the presence of the metallized layer 83, generation and residual stress in the direction of the through hole 82 can be reduced.

Further, in this example, the glass layer 85 is formed on the metallized layer 84, and the glass having high corrosion resistance is penetrated into the metallized structure, thereby improving the airtightness and the life. 84 and the glass layer 85
It is not a requirement of the present invention. The structure shown in FIG.
It can be used particularly preferably when the inner diameter of the end 12 of the ten is relatively small.

In the structure shown in FIG. 18, the end of the ceramic discharge tube
A first cylindrical closing member 87 is fixed to the inner side surface of the second closing member 87, and a second cylindrical closing member 87 is provided inside the first closing member 87.
The current conductor 6 is accommodated in the space inside the second closing member 86. Metallized layers 84A and 83 are formed between the first closing member 87 and the second closing member 86, and between the second closing member 86 and the current conductor 6. Blocking material 86
And the main surface facing the outside of the ceramic discharge tube of 87,
A metallized layer 84A that is continuous with the metallized layers 84A and 83B is formed, and a glass layer 85 is formed on the metallized layer 84A. A metallized layer 84B that is continuous with the metallized layers 83A and 83B is formed on the main surface of the closing members 86 and 87 facing the inner space 13.

The thermal expansion coefficient of the ceramic discharge tube 10 is Tc, the thermal expansion coefficient of the first plugging material 87 is T1, the thermal expansion coefficient of the second plugging material 86 is T2, and the thermal expansion coefficient of the current conductor 6 is
When Tm, so as to satisfy the relationship of Tc ≧ T1> T2 ≧ Tm,
It is necessary to select the material of each member.

In the example shown in FIG. 18, even if the inner diameter of the end portion 12 increases,
Since the configuration is capable of achieving the effects of the present invention, it can be suitably applied to a ceramic discharge tube having a relatively large inner diameter at the end 12 of the ceramic discharge tube 10.

Note that, in the example shown in FIG.
84A and the glass layer 85 can be eliminated. Further, although the closing member is composed of the two first closing members 87 and the second closing member 86, the number of divisions in the radial direction is not limited to two. Between the thermal expansion buffer and
It is also possible to provide one or more thermal expansion mitigants. However, also in this case, it is necessary to make the thermal expansion coefficient of the outer thermal expansion relaxation material larger than the thermal expansion coefficient of the inner thermal expansion relaxation material, and the relationship of Tc ≧ T1> T2 ≧ Tm is satisfied. Need to be met.

In the example shown in FIG. 19, the first thermal expansion moderating material is arranged so as to face the main surface of the closing material 81 facing the outside of the ceramic discharge tube 10.
89 is provided, and the first thermal expansion relaxation material 89 of the closing material 81 is provided.
On the opposite side, a second thermal expansion relaxation material 90 is provided.
The current conductor 6 is accommodated in each of the through holes 89a, 90a of the first thermal expansion relaxation material 89 and the second thermal expansion relaxation material 90. Inner diameter of first thermal expansion moderator 89 and second thermal expansion moderator 90
Is designed so that the inner diameter of the opening member 81 is larger than the inner diameter of the closing member 81.

A metallized layer 84A is provided and fixed between one main surface of the first thermal expansion moderating material 89 and the closing material 81, and one main surface of the second thermal expansion moderating material 90 and the closing material 81 A metallized layer 84B is provided between them and fixed. Furthermore, the metallized layer 83 is pressed against the current conductor 6 by the plugging material 81 using the compressive stress caused by the shrinkage of the end portion 12 of the ceramic tube 10 by firing, and the current conductor 6 is held.

The first thermal expansion relaxation material 89 in the present example plays a role of a backup ring for relaxing stress in the central axis direction of the end portion 12 of the ceramic discharge tube 10. In addition, the second thermal expansion moderating material 90 has a metallized layer 84 exposed in the ceramic discharge tube 10 in addition to the role of the backup ring described above.
Protecting B from the gas in the internal space of the ceramic discharge tube 10 serves to reduce the occurrence of back arc on the metallized layer 84B.

The material of the first thermal expansion moderator 89 and the second thermal expansion moderator 90 is not particularly limited, but is preferably made of the same material as the ceramic discharge tube 10, for example, Al ₂ O ₃ .

In the example shown in FIG. 19, a glass layer 85 is provided between the current conductor 6 and the first thermal expansion relaxation material 89 provided on the metallized layer 84A of the plugging material 81 and outside the plugging material 81. This allows the glass to penetrate the exposed metallized structure.

Further, a corner of the first thermal expansion buffer 89 in contact with the end 12 of the ceramic discharge tube 10, a corner of the second thermal expansion buffer 90 in contact with the end 12, and an end 12 of the plug 81. In the corner that touches,
Each has a chamfered portion 88 formed. Chamfer 88
In addition to the C chamfer as shown in the figure, a shape such as an R chamfer can be used. By providing such a chamfered portion 88, stress concentration between the corner of each member and the end 12 of the ceramic discharge tube 10 can be reduced, and breakage at the corner can be eliminated. Also in this example, as shown in FIG. 18, the closing member 81 may be composed of a plurality of members.

In the above-described embodiment, as the material of the closing member 81,
The same kind of material as the ceramic discharge tube 10 can be used, or a different kind of material can be used. Here, the same kind of material refers to a material having a common base ceramic, and there is no problem even if the added components are different.

Next, as the material of the metallized layers 83, 83A, 83B, 84, 84A, 84B, those described above can be used, and the thickness can also be as described above.

 As the material of the current conductor 6, those described above can be used.

Hereinafter, a preferred example of the method for manufacturing a high-pressure discharge lamp according to the present invention will be described with reference to the flowcharts shown in FIGS. The method for manufacturing the high-pressure discharge lamp shown in FIG. 20 mainly relates to the method for manufacturing the high-pressure discharge lamp having the end structure shown in FIG.
The method for manufacturing a high-pressure discharge lamp shown in FIG. 21 mainly relates to a method for manufacturing a high-pressure discharge lamp having an end structure shown in FIG.

First, in FIG. 20, a molded body of a cermet ring to be the plugging material 81 after firing is obtained by press-molding a powder obtained by granulating with a spray dryer or the like at a pressure of 2000 to 3000 kgf / cm ² . The obtained molded body is heated at a temperature of 600 to 800 ° C. to perform a binder removal treatment. Next, the compact after the binder removal treatment is subjected to a deoxygenation treatment under a hydrogen reducing atmosphere at a temperature of 1200 to 1400 ° C. to obtain a cermet ring. This deoxygenation treatment is for imparting a certain strength to the cermet ring, preventing paste leveling failure due to suction of a solvent at the time of applying the paste described below, and improving the handleability of the cermet ring.

Next, on the inner surface of the through hole of the obtained cermet ring,
_{Mo: 60vol%, Al 2 O} 3: 40vol%, performs a through hole printing for printing a solvent-removed metallizing paste in a binder a slight amount and a solvent. In this through-hole printing, a metallized paste is applied around one of the through holes, and the metallized paste is drawn into the through hole by vacuuming from the other end of the through hole, and the metallized paste is applied to the entire inner surface of the through hole. It is done by printing. The cermet ring after this through-hole printing is dried at a temperature of about 120 ° C.
Next, edge printing is performed to print a metallized paste on one of the main surfaces of the cermet ring. This edge printing is performed twice. Dry the cermet ring after edge printing.

Then, a Mo pipe or rod as the electrode conductor 6 prepared in advance is inserted into the through hole of the obtained cermet ring and set at a predetermined position, and a reducing atmosphere having a dew point of 20 to 50 ° C. at a temperature of 1400 to 1600 ° C. Pre-bake underneath. Next, the cermet ring to which the pre-fired Mo pipe or rod was fixed was inserted into the end face of the alumina tube obtained by previously removing the alumina molded body and calcining, and was set at a predetermined position. Main firing is performed in a reducing atmosphere having a dew point of −10 to 20 ° C. at a temperature of ° C. to obtain a high-pressure discharge lamp of the present invention.
In some cases, the corrosion resistant glass is infiltrated into the metallized structure after the main sintering to improve the airtightness and the life. The structure shown in FIGS. 17 and 18 is one example. The reason why the preforming and the main firing are performed in separate steps is to prevent the binder in the metallized paste from contaminating the alumina tube and to position the electrodes.

In the production method shown in FIG. 21, a molded body of a cermet ring serving as the plugging material 81 is obtained by press-molding a powder granulated by a spray dryer or the like at a pressure of 2000 to 3000 kgf / cm ² . Heating the obtained molded body at a temperature of 600 to 800 ° C.,
A binder removal process is performed. Next, the compact after the binder removal treatment is subjected to a deoxygenation treatment under a hydrogen reducing atmosphere at a temperature of 1200 to 1400 ° C. to obtain a cermet ring. This deoxygenation treatment is for imparting a certain strength to the cermet ring, preventing paste leveling failure due to blowing of a solvent at the time of applying the paste described below, and improving the handling property of the cermet ring.

Next, on the inner surface of the through hole of the obtained cermet ring,
_{Mo: 60vol%, Al 2 O} 3: 40vol%, performs a through hole printing for printing the configured metallizing paste in a binder a slight amount and a solvent. In this through-hole printing, a metallized paste is applied around one of the through holes, and the metallized paste is drawn into the through hole by vacuuming from the other end of the through hole, and the metallized paste is applied to the entire inner surface of the through hole. It is done by printing. The cermet ring after the through-hole printing is dried at a temperature of about 120 ° C. Next, edge printing is performed to print the metallized paste on both main surfaces of the cermet ring, and the cermet ring after the edge printing is dried. The end printing on both main surfaces is performed by performing the end printing on one main surface, then performing the same end printing on the other main surface, and performing each end printing twice.

In parallel, two alumina rings to be the first thermal expansion relaxation material 89 and the second thermal expansion relaxation material 90 after firing are prepared. Alumina ring is used to remove the binder by heating at a temperature of 600 to 800 ° C. on an alumina ring molded body obtained by press-molding a powder granulated by a spray dryer or the like at a pressure of 2000 to 3000 kgf / cm ^2. At 1200 to 1500 ° C. in a hydrogen reducing atmosphere. The obtained alumina ring is subjected to metallization printing only on both main surfaces. Thereafter, without drying the alumina ring, the alumina ring, the cermet ring prepared as described above, and the alumina ring are laminated and dried in a state where a slight load is applied in this order to obtain an assembly.

Thereafter, a Mo pipe or rod as the electrode conductor 6 prepared in advance is inserted into the through hole of the obtained assembly and set at a predetermined position, and a mist point of 20 to 50 at a temperature of 1400 to 1600 ° C.
Preliminary firing is carried out in a reducing atmosphere at ℃. Next, pre-bake
Cermet ring to which Mo pipe or rod is fixed,
The alumina molded body was previously removed from the binder, inserted into the end face of the alumina tube obtained by calcining, and set at a predetermined position.
Main firing is performed at a temperature of 00 to 1900 ° C. in a reducing atmosphere having a dew point of −10 to 20 ° C. to obtain a high-pressure discharge lamp of the present invention. In some cases, corrosion-resistant glass is infiltrated into the metallized structure after the main sintering to improve airtightness and life, and the structure shown in FIG. 19 is one example.

In the above-described embodiment, the molding is performed by press molding, but it goes without saying that this molding is not limited to press molding. In addition, the metallizing paste is applied to the green body, but it goes without saying that the target of the metallizing paste application is not limited to the green body.

In the present invention, further, when at least the inside of the end portion of the ceramic discharge tube of the plugging material is formed of the same type of material as the ceramic discharge tube, the thermal expansion moderating material is disposed outside the ceramic discharge tube so as to face the plugging material. And sealing between the thermal expansion moderating material and the closing material with a molten glass material, and sealing between the thermal expansion moderating material and the current conductor with a glass material molten environment. Can be. 22 to 26 are cross-sectional views each showing an end structure of this embodiment.

In the end structure of FIG. 22, the closing material 91 is provided inside the end 12.
Is inserted. In the through hole 91b of the closing member 91,
An elongated annular current conductor 5 is inserted. Current conductor 5
A pressure-bonding surface is formed between and the closing member 91. A ring-shaped thermal expansion relaxation material 93 is provided at a position facing the outer main surface 91d of the closing material 91, and the main surface of the closing material 91 is provided.
91d and the end surface 93a of the thermal expansion relaxation material 93 face each other. The current conductor 5 is also inserted into the through hole 93b at the center of the thermal expansion relaxation material 93.

A sealing material layer 92A made of a molten glass material is provided between the main surface 91d of the closing material 91 and the end surface 93a of the thermal expansion relaxation material 93, and the through hole 93b of the thermal expansion relaxation material 93 and the current A sealing material layer 92B made of a molten glass material is provided between the sealing material layer 92B and the conductor 5. Thereby, a sealing surface in the central axis direction of the ceramic discharge tube and a sealing surface in the direction perpendicular to the central axis are formed.

It has been found that the use of such a molten glass material further improves the performance of preventing gas leakage.

As the composition of such glass, a known glass composition can be used, and specifically, Dy ₂ O ₃ -Al ₂ O ₃ -SiO ₂
Glass or _{systems, Y 2 O 3 -Al 2 O} 3 -SiO 2 based glass (over, JP-B No. 56-44025 Publication, JP-B-61-233962 and JP reference No. No. 61-37225) Can be illustrated. However, and glass above _{Dy 2 O 3 -Al 2 O 3} -SiO 2 system, Y ₂ O ₃ -Al
_By further adding MoO ₃ to the ₂ O ₃ —SiO ₂ system glass, the corrosion resistance of this glass and the wettability of the current conductor were further improved. As a result, in the structure of FIG. 22, the leak rate is 8.3 × 10 ⁻¹¹ (mbar · liter · second).
^-1 ) The following was achieved.

On the main surface 91c of the closing member 91 on the inner space 13 side, an insulating layer 95 made of a material having corrosion resistance to halogen gas can be formed. Further, a receiving portion 91a of the human electrode shaft on the main surface 91c side is formed.

In the end structure of FIG. 23, the same members as those shown in FIG. 22 are denoted by the same reference numerals, and description thereof will be omitted. This is the figure
The same applies to 24 or less.

In FIG. 23, the closing material 50A is inserted inside the end portion 12. The current conductor 5 is inserted into the through holes 14a and 15a of the closing member 50A. A crimping surface is formed between the outer portion 15 and the current conductor, but no crimping is performed between the inner portion 14 and the current conductor 5. A ring-shaped thermal expansion relaxation material 93 is provided at a position facing the outer main surface 15b of the closing material 50A, and between the main surface 15 of the closing material 50A and the end surface 93a of the thermal expansion reducing material 93. Is provided with a sealing material layer 92A made of a molten glass material. An insulating layer 95 made of a material having corrosion resistance to halogen gas can be formed on the surface 14c on the inner space 13 side of the closing member 50a. A receiving portion 14b for the electrode shaft is formed on the main surface 14c.

In FIG. 24, the closing member 56 is inserted inside the end portion 12. The current conductor 5 is inserted into the through holes 14a and 57a of the closing member 56. Neither the outer portion 57 and the current conductor 5 nor the inner portion 14 and the current conductor 5 are crimped together.
A ring-shaped thermal expansion relaxation material 93 is provided at a position facing the outer main surface 57b of the closing member 56, and the main surface 57 of the closing member 56 is provided.
b and the end face 93a of the thermal expansion relaxation material 93, and between the current conductor 5 and the end face 93b, sealing material layers 92A and 92B made of a molten glass material.
Is provided. A metallization layer 96 is also formed between the outer part 57 and the current conductor 5.

In FIG. 25, a closing member 97 is inserted inside the end 12. The current conductor 106 is inserted into the through hole 97a of the closing member 97. The current conductor 106 shown in the present embodiment has a rod shape, and gas cannot pass through the inside of the current conductor 106. A ring-shaped thermal expansion relaxation material 93 is provided at a position facing the outer main surface 97d of the closing material 97, and between the main surface 97d of the closing material 97 and the end surface 93a of the thermal expansion reducing material 93. Furthermore, sealing material layers 92A and 92B made of a molten glass material are provided between the current conductor 106 and the end face 93b.

A metallized layer 98 is formed between the inner surface of the closing member 97 and the current conductor 106. When the metallized layer 98 is provided in this manner, the metallized layer
The compression stress applied to 98 promotes the densification of metallized layer 98. According to this aspect, the metallized layer 98
The synergistic effect of the high corrosion resistance of the glass layer and the high airtightness of the glass layers 92A and 92B further reduces the risk of gas leakage.

Further, it is preferable to form an insulating layer 95 made of a material having corrosion resistance to halogen gas and electrical insulation on the main surface 97c on the inner space 13 side of the closing member 97, thereby forming a metallization layer 98. Short circuits can be reliably prevented.

A receiving portion 97b of the electrode shaft is formed on the main surface 97c side.

In FIG. 26, a receiving portion 12b protruding inside the end portion 12 is shown.
25 is placed thereon, and the sealing material 97 for FIG. 25 is placed thereon, and the space between the sealing material 97 and the surface 12a of the end 12A is sealed by a sealing material layer 105 made of a molten glass material.

That is, in the end structures of the respective embodiments as shown in FIGS. 22 to 24, in each case, a pipe-shaped current conductor 5 is used, and gas is passed through the inner space of the current conductor 5. A predetermined gas is supplied into the inside of the ceramic discharge tube 10. However, using the end structure as shown in FIG. 26, the sealing material layer 10 is formed between the closing material 97 and the inner side surface 12a of the end 12A.
If it is made to seal by 5, a predetermined gas is injected into the ceramic discharge tube 10 immediately before the plugging material 97 is installed inside the end 12A, and then the plugging material 97 is inserted into the end 12A. ,
The glass frit can be melted by setting the glass frit between them. According to this method, a high-pressure discharge lamp can be produced without injecting gas from the pipe-shaped current conductor 5.

In the case where the sealing material layer is formed from the molten glass material as described above, as shown in FIG.
(15, 57, 97, etc.) and the thermal expansion buffer 93 between the sealing material layer 92
It is preferable to form a curved surface 99 concave toward the inside at the end of A. This is preferable because stress is less likely to be concentrated at one point in the sealing material layer. Further, FIG.
As shown in (b), the corners of the ends of the plugging material 91 (15, 57, 97, etc.) on the side of the sealing material layer and the corners of the ends of the thermal expansion relaxation material 93 on the side of the sealing material layer. In addition, by forming the chamfered portions 101, such concentration of stress is more unlikely to occur.

In order to manufacture a high-pressure discharge lamp having the above-mentioned end structure, unlike the case of the metallized layer, the main body of the ceramic discharge tube in which the plugging material is fixed, and the thermal expansion moderating material are each fired. After manufacturing separately, the glass material is installed between the closing material fixed to the ceramic discharge tube and the thermal expansion reducing material, and between the thermal expansion reducing material and the current conductor, respectively, and the glass material is melted. Thereby, a sealing material layer is formed.

In a particularly preferred embodiment, a method as shown in the flowchart in FIG. 28 is used. That is, a molded body of the plugging material is prepared, and the molded body is debindered, for example, 700 to 1200.
A calcined body is obtained by calcining at ℃. This calcined body is reduced as described above. A metallized paste is applied to the calcined body at a predetermined location as necessary, and the metallized paste is dried. Such a metallized paste becomes each metallized layer in each structure shown in FIGS. 24 to 26 after firing.

On the other hand, a current conductor 5 or 6 with an electrode system was prepared, and this current conductor was inserted into the through hole of the closing material to obtain an assembly. The assembly was heated at 1300 to 1700 ° C. with hydrogen +
Preliminary firing in a nitrogen atmosphere.

On the other hand, a molded body of a ceramic discharge tube made of alumina or the like was prepared, and the molded body was debindered.
A calcined body is obtained by calcining in air at a temperature of from 1 to 1200 ° C.

The pre-fired body of the plugging material is inserted into the end of the calcined body of the ceramic discharge tube, and the main firing is performed at, for example, 1600 ° C. to 2000 ° C. in a hydrogen + nitrogen atmosphere.

On the other hand, a molded body of the thermal expansion relaxation material is prepared, the molded body is debindered, and calcined to obtain a calcined body. In this, main firing is performed.

The sealing material layer is formed by placing the main surface of the closing material facing the end surface of the thermal expansion reducing material, placing a predetermined glass frit therebetween, and melting the glass frit. One or both of the two current conductors to be integrated with the ceramic discharge tube are used as a pipe-shaped current conductor 5. A predetermined halide gas is sealed through the current conductor, and the inlet of the current conductor 5 is sealed.

However, when both of the current conductors to be integrated with the ceramic discharge tube are rod-shaped current conductors, the halide gas cannot be sealed through the current conductors. Therefore, on the side of the end shown in FIG. 26, the thermal expansion moderating material 93 and the closing material 97 are manufactured by firing each, and then,
The thermal expansion relaxation material 93, the closing material 97, and the current conductor 106 are joined by sealing material layers 92A and 92B made of glass. On the other hand, the calcined body of the ceramic discharge tube is fully fired. Then
The halide gas is sealed in the ceramic discharge tube, the plugging material 97 is immediately inserted into the end portion 12A of the ceramic discharge tube, and a glass frit is placed between the plugging material 97 and the plugging material 97 and the end portion 12A.
Seal between A and molten glass.

In the foregoing description, the present invention has been described with reference to particular embodiments, but the specific details illustrated are merely exemplary and may depart from the true spirit and scope of the following claims. Rather, it should be understood that it can be implemented in other ways.

──────────────────────────────────────────────────の Continued on the front page (31) Priority claim number Japanese Patent Application No. 7-191938 (32) Priority date July 27, 1995 (July 27, 1995) (33) Priority claim country Japan (JP) (56) References JP-A-6-150885 (JP, A) JP-A-63-184258 (JP, A) JP-A-6-318435 (JP, A) JP-A-61-147448 (JP, A) JP-A-60-84761 (JP, A) JP-A-5-198285 (JP, A) JP-B-49-35794 (JP, B1) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01J 61 / 36 H01J 9/26

Claims (29)

(57) [Claims] 1. A ceramic discharge tube in which an internal space is filled with an ionized luminescent substance and a starting gas; a closing member fixed at least partially inside an end of the ceramic discharge tube, provided with a through hole. A closing member having an inner portion fixed in the end of the ceramic discharge tube and an outer portion integrated with the inner portion; inserted into the through hole of the closing member A current conductor with an electrode system being provided; and a sealing material layer formed so as to be joined to the outer portion and the current conductor, other than the through hole, the outer portion and the current A high-pressure discharge lamp characterized in that a conductor is in close contact with the conductor. 2. The high-pressure discharge lamp according to claim 1, wherein said sealing material layer comprises a metallized layer. 3. The ceramic package according to claim 1, wherein the inner portion is made of the same material as the ceramic discharge tube, and the outer portion is formed between a coefficient of thermal expansion of a material of the ceramic discharge tube and a coefficient of thermal expansion of a material of the current conductor. 3. The high-pressure discharge lamp according to claim 1, wherein the high-pressure discharge lamp is made of a composite material having a coefficient of thermal expansion. 4. A ceramic discharge tube in which an internal space is filled with an ionized luminescent substance and a starting gas; a closing member fixed at least partially inside an end of the ceramic discharge tube, provided with a through hole. A closing member having an inner portion fixed in the end of the ceramic discharge tube and an outer portion integrated with the inner portion; inserted into the through hole of the closing member A current conductor with an electrode system being provided; and a sealing material layer formed so as to be joined to the closing material and the current conductor other than the through hole, and the current flowing from the inner portion. A high-pressure discharge lamp, wherein substantially no compressive stress is applied to a conductor, and the sealing material layer is formed so as to be joined to the outer portion and the current conductor. 5. The high-pressure discharge lamp according to claim 4, wherein said sealing material layer comprises a metallized layer. 6. The ceramic tube according to claim 6, wherein said inner portion is made of the same material as said ceramic discharge tube, and said outer portion is formed between a coefficient of thermal expansion of a material of said ceramic discharge tube and a coefficient of thermal expansion of a material of said current conductor. The high-pressure discharge lamp according to claim 4, wherein the high-pressure discharge lamp is made of a composite material having a coefficient of thermal expansion. 7. A ceramic discharge tube in which an internal space is filled with an ionized luminescent substance and a starting gas; a closing member fixed at least partially inside an end of the ceramic discharge tube, provided with a through hole. A current conductor with an electrode system inserted into the through hole of the closing material; a seal formed so as to be joined to the closing material and the current conductor other than the through hole; A thermal expansion reducing material provided outside the ceramic discharge tube so as to face the plugging material; and a refractory metal inserted between the plugging material and the thermal expansion reducing material. An annular member, wherein the sealing material layer is formed between the annular member and the closing member and between the annular member and the thermal expansion relaxing material, respectively, The annular Characterized in that it is joined with respect to timber and the sealing member, the high pressure discharge lamp. 8. The high-pressure discharge lamp according to claim 7, wherein said sealing material layer comprises a metallized layer. 9. A ceramic discharge tube having an internal space filled with an ionized luminescent substance and a starting gas; a closing member fixed at least partially inside an end of the ceramic discharge tube, wherein a through hole is provided. A current conductor with an electrode system inserted into the through-hole of the closing material; and a portion other than the through-hole, which is formed so as to be joined to the closing material and the current conductor. A sealing material layer is provided, at least the inside of the end portion of the ceramic discharge tube of the plugging material is made of the same material as the ceramic discharge tube, and a compression plugging material is provided outside the plugging material. The current conductor is inserted into each of the through holes of the closing member and the crimp closing member, and a gap between the closing member and the crimp closing member and a gap between the crimp closing member and the current conductor. Are sealed by the sealing material layer, characterized in that the pressing force is applied to the circumferential direction from the crimp sealing member against the sealing material layer between the current conductor and the crimping sealing member,
Ceramic high pressure discharge lamp. 10. The high-pressure discharge lamp according to claim 9, wherein said sealing material layer comprises a metallized layer. 11. A ceramic discharge tube in which an internal space is filled with an ionized luminescent substance; a first plugging material fixed at least partially inside an end of the ceramic discharge tube, wherein a through hole is provided. A cylindrical first closing member; a second closing member housed in a space inside the through hole of the first closing member, wherein the second cylindrical member has a through hole. A current conductor inserted through a through hole of the second plugging material;
And a metallizing layer for sealing, wherein the first closing member and the second closing member are provided between the first closing member and the second closing member within an end of the ceramic discharge tube. The metallized layer is formed so as to be bonded to an agent, and the metallized layer is formed between the second plugging material and the current conductor so as to be bonded to the second plugging material and the current conductor. Characterized by the fact that
High pressure discharge lamp. 12. The high pressure discharge lamp according to claim 11, wherein glass penetrates into the open pores of said metallized layer. 13. A ceramic discharge tube in which an internal space is filled with an ionized luminescent substance; a closing material fixed at least partially inside an end of the ceramic discharge tube, wherein a through hole is provided. A closing member; a current conductor inserted through the through hole of the closing member; and a sealing metallization layer formed so as to be bonded to the closing member and the current conductor, and the ceramic The metallized layer is provided between the through hole of the plugging material and the current conductor within the end of the discharge tube, so as to face a main surface of the plugging material facing the outside of the ceramic discharge tube. A first thermal expansion moderating material is provided, and a second thermal expansion moderating material is provided on a side of the closing member opposite to the first thermal expansion moderating material, wherein the first thermal expansion moderating material is provided. Material and said second heat The current conductor is accommodated in a through hole of the tension relaxing material, and an inner diameter of the first thermal expansion relaxing material and an inner diameter of the second thermal expansion relaxing material are larger than an inner diameter of the closing material. And a high-pressure discharge lamp. 14. The high pressure discharge lamp according to claim 13, wherein glass has penetrated into the open pores of said metallized layer. 15. A glass layer is formed between the through hole of the first thermal expansion relaxation material and the current conductor so as to contact the metallized layer.
The high pressure discharge lamp as described. 16. A corner portion of said plugging member which is in contact with said ceramic discharge lamp, a corner portion of said first thermal expansion relaxation material which is in contact with said ceramic discharge tube, and said ceramic discharge tube of said second thermal expansion relaxation material. The high-pressure discharge lamp according to any one of claims 13 to 15, wherein a chamfered portion is provided at each of the contacting corners. 17. A ceramic discharge tube in which an internal space is filled with an ionized luminescent substance; a closing material fixed at least partially inside an end of the ceramic discharge tube, wherein a through hole is provided. A closing conductor; a current conductor inserted through the through-hole of the closing member; and a sealing metallization layer formed so as to be joined to the closing member and the current conductor; A high-pressure discharge lamp characterized in that glass penetrates into the open pores of the layer. 18. The high-pressure discharge lamp according to claim 17, wherein the metallized layer is provided between the through-hole of the plugging material and the current conductor within an end of the ceramic discharge tube. . 19. A ceramic discharge tube in which an internal space is filled with an ionized luminescent substance; a closing member fixed at least partially inside an end portion of the ceramic discharge tube, wherein a through hole is provided. An obstruction material; a current conductor inserted through the through hole of the obstruction material; and a sealing metallization layer formed so as to be joined to the obstruction material and the current conductor. A high-pressure discharge lamp, characterized in that a chamfered portion is provided at each corner of the material in contact with the ceramic discharge lamp. 20. The high-pressure discharge lamp according to claim 19, wherein said metallized layer is provided between said through hole of said plugging material and said current conductor within an end of said ceramic discharge tube. . 21. A ceramic discharge tube in which an internal space is filled with an ionized luminescent substance and a starting gas; a closing member fixed at least partially inside an end of the ceramic discharge tube, provided with a through hole. A current conductor with an electrode system inserted into the through-hole of the closing material; and a portion other than the through-hole, which is formed so as to be joined to the closing material and the current conductor. A method for producing a high-pressure discharge lamp comprising a sealing material layer, comprising: mounting an electrode system on the current conductor on an inner space side of the ceramic discharge tube, wherein a tip side of the electrode system is attached to the ceramic discharge tube. Bent toward the central axis to form an annular protrusion on the outer peripheral surface of the current conductor, produce a body to be fired of the closing material, and replace the current conductor with the electrode system with the current conductor. Insert the current conductor with the electrode system into the through-hole of the body to be fired of the plugging material from the side of the electrode system, and fix the current conductor with the electrode system in the through-hole. The annular projecting portion and the object to be fired of the closing member are opposed to each other when viewed in the central axis direction of the ceramic discharge tube so that the component of the sealing material is not interposed in the hole. Forming an encapsulant component layer between the ceramic discharge tube and the object to be fired; manufacturing the object to be fired of the ceramic discharge tube; A method for manufacturing a high-pressure discharge lamp, comprising fixing at least a part of a material and sintering the fired body of the closing material, the fired body of the ceramic discharge tube, and the sealing material component layer. 22. A ceramic discharge tube in which an internal space is filled with an ionized luminescent substance; a closing member fixed at least partially inside an end portion of the ceramic discharge tube, wherein a through hole is provided. A closing member; a current conductor inserted through the through hole of the closing member; and a sealing metallization layer formed so as to be bonded to the closing member and the current conductor, and the ceramic A method for manufacturing a high-pressure discharge lamp in which the metallized layer is provided between the through-hole of the plugging material and the current conductor within an end of a discharge tube, wherein a through-hole of a body to be fired of the plugging material is provided. A metallizing paste, and fixing the metallizing paste to the inner surface of the end portion of the ceramic discharge tube among the two main surfaces of the plugging material orthogonal to the through holes of the plugging material. When the metal conductor is applied to the main surface outside the ceramic discharge tube, the current conductor is inserted into a predetermined position of the through hole to which the metallizing paste of the plugging material is applied, and the current conductor is baked by baking the metallizing paste. A high-pressure discharge lamp, wherein the high-pressure discharge lamp is fixed in a through-hole, and then fired integrally after inserting the fired body of the closing material at a predetermined position on the inner surface of the end of the fired body of the ceramic discharge tube. Manufacturing method. 23. The method for manufacturing a high-pressure discharge lamp according to claim 22, wherein glass is permeated into open pores of a metallized layer provided on said main surface of said plugging material after said integrally firing. 24. The high-pressure discharge lamp according to claim 22, wherein a chamfered portion is provided at a corner of the plugging member, which is in contact with the ceramic discharge tube, of the object to be fired, and then the integral firing is performed. Manufacturing method. 25. A ceramic discharge tube in which an internal space is filled with an ionized luminescent substance; a closing material fixed at least partially inside an end of the ceramic discharge tube, wherein a through hole is provided. A closing member; a current conductor inserted through the through hole of the closing member; and a sealing metallization layer formed so as to be bonded to the closing member and the current conductor, and the ceramic A method for manufacturing a high-pressure discharge lamp in which the metallized layer is provided between the through-hole of the plugging material and the current conductor within an end of a discharge tube, comprising: a first cylindrical thermal expansion relaxation material And the cylindrical body to be fired of the second thermal expansion moderating material, respectively, wherein the inner diameter of the first thermal expansion moderating material and the second thermal expansion moderating material after integrally firing Is larger than the inner diameter of the closing material Metallizing paste is applied to at least the through holes of the fired body of the closing material, and the fired body of the closing material, the fired body of the first thermal expansion relaxation material, and the second heat The current conductor is inserted into each through hole of the material to be fired of the expansion relaxation material, and the current conductor is fixed in the through hole by baking the metallized paste. At a predetermined position on the inner surface of the body, the fired body of the first thermal expansion relaxation material, the fired body of the second thermal expansion relaxation material, and the fired body of the plugging material to which the current conductor is fixed are inserted. After that, a method for manufacturing a high-pressure discharge lamp, characterized by firing integrally. 26. A metallized paste layer is provided between an object to be fired of said plugging material and an object to be fired of said first thermal expansion reducing material, and a metallized paste layer is provided between said object to be fired of said plugging material and said metalized paste layer. 26. The method for manufacturing a high-pressure discharge lamp according to claim 25, wherein the high-pressure discharge lamp is provided between the second thermal expansion relaxation member and the object to be fired. 27. The method according to claim 27, wherein the glass is melted between the through hole of the first thermal expansion relaxation material and the current conductor on the metallized layer of the closing material after the integrally firing.
A method for manufacturing a high-pressure discharge lamp according to claim 26. 28. A chamfered portion is provided at a corner of the body to be fired of the plugging member which is in contact with the ceramic discharge tube, and a chamfer is formed at a corner of the body to be fired of the first thermal expansion relaxation material which is in contact with the ceramic discharge tube. 28.The method according to claim 25, wherein the integral firing is performed after a chamfered portion is provided at a corner portion of the object to be fired of the second thermal expansion relaxation material which is in contact with the ceramic discharge tube. A method for manufacturing a high-pressure discharge lamp according to claim 1. 29. A ceramic discharge tube in which an internal space is filled with an ionized luminescent substance; a first plugging material fixed at least partially inside an end of the ceramic discharge tube, wherein a through hole is provided. A cylindrical first closing member; a second closing member housed in a space inside the through hole of the first closing member, wherein the second cylindrical member has a through hole. A current conductor inserted through a through hole of the second plugging material;
And a metallizing layer for sealing, wherein the first plugging member and the second plugging member are provided between the first plugging member and the second plugging member within an end of the ceramic discharge tube. The metallized layer is formed so as to be bonded to an agent, and the metallized layer is formed between the second plugging material and the current conductor so as to be bonded to the second plugging material and the current conductor. When manufacturing the high pressure discharge lamp, a metallized paste is applied between the fired body of the first plugging material and the fired body of the second plugging material, After applying the metallized paste to the through-hole of the fired body, inserting the current conductor into a predetermined position of the through-hole to which the metallized paste of the second plugging material has been applied, and then baking the metallized paste, Said Fixed in the through hole, and by integrating the object to be fired body of the second clogging member and the firing of the first sealing member,
Next, after inserting the fired body of the first plugging material at a predetermined position on the inner surface of the end of the fired body of the ceramic discharge tube, the fired body of the ceramic discharge tube, A method for manufacturing a high-pressure discharge lamp, wherein the object to be fired and the object to be fired of the second plugging material are integrally fired.