JPH0945244A - Manufacture of high-pressure discharge lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reliable high-pressure discharge lamp, without the occurrence of the damage and destruction of members at the end, and the leak of an ionized luminous substance, even when lighting/extinguishment is repeated many times, by improving the sealing structure of a ceramic discharge tube end part. SOLUTION: A high-pressure discharge lamp; provided with a ceramic discharge tube 10 filled with an ionized luminous substance between an inside space, a blocking material 51 fixed to the inner side of the end part 12 of the tube 10 and having a through hole 52, an electric current conductor 6 inserted into the through hole 52 of the blocking material 51, and a sealing metallized layer 53 provided between the blocking material 51 and the conductor 6; is manufactured by the following method; metallized paste is applied to at least the hole 52 of the formed blocking material 51, and the conductor 6 is inserted into the given position of the applying through hole to bake the metallized paste. Then, the blocking material 51, wherein the conductor 6 is baked to be fixed, is inserted into the given position of the inner surface of the end part of the tube 10, prepared separately and temporarily baked, and is integrally baked.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a high pressure discharge lamp using a ceramic discharge tube.

[0002]

2. Description of the Related Art 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 closed. A through hole is provided in the material, and a metal current conductor to which a predetermined electrode system is fixed is inserted through the through hole. 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. The use of ceramic as the material of the discharge tube has made it possible to use it at high temperatures.

FIG. 7 is a sectional view showing a preferred example of the structure of the end portion of such a ceramic discharge tube. The main body 11 of the ceramic discharge tube has a tubular or barrel shape with both ends narrowed, and a cylindrical end 12 is provided at both ends of the main body 11. The main body 11 and the end portion 12 are made of, for example, an alumina sintered body. 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 axial direction of the main body, so that a corner portion 36 is formed between the main body 11 and the end portion 12. There is. Inside the end portion 12 is a closure member 4
1 is inserted and held, and a through hole 41a is formed so as to extend in the axial direction of the closing member 41.
An elongated current conductor 5 is inserted and fixed in the through hole 41a. In this example, the current conductor 5 has a cylindrical shape, and the ionized luminescent material is introduced into the internal space 13 of the main body 11 through the inside surface 5 a of the current conductor 5. The outer end of the current conductor 5 is provided with a sealing portion 5b that seals the starting gas and the luminescent material and then seals the electrode shaft 7 to the outer peripheral surface of the current conductor 5. .

It is necessary to seal between the plug 41 and the end 12 of the ceramic discharge tube, and between the plug 41 and the current conductor 5, but in a preferred example, a calcined body of the plug 41 is used. The current conductor 5 is inserted into the through hole of the above, and the closing member 41 is inserted into the end portion 12 to manufacture an assembly, and the assembly is integrally sintered. At this time, the end portion 12 is formed by integral sintering.
And the blocking member 41, and the blocking member 41 and the current conductor 5 are sealed.

In the above-mentioned sealing method, when the calcined body of the end portion 12 is fired without inserting the calcined body of the closing member 41 into the calcined body of the end portion 12, the inner diameter of the end portion 12 is Blocking material 4
The outer diameter is smaller than the outer diameter of No. 1 so that the occluding member 41 is firmly tightened and held in the end portion 12. The same applies to the blocking member 41 and the current conductor 5. As the material of the current conductor, molybdenum, tungsten, rhenium or alloys thereof are advantageous from the viewpoint of corrosion resistance,
Alumina ceramics is generally used as the material of the ceramic discharge tube. Further, when alumina ceramics is used as the material of the occluding material, the difference in thermal expansion between the occluding material and the current conductor becomes large. Therefore, as the material of the occluding material, a composite material of alumina ceramics and the above metal or other It is known to use cermet.

[0006]

However, the present inventor
As a result of further study on this manufacturing method, the following problems were found. That is, at the stage of the above-mentioned integral firing, the calcined body of the end portion 12 and the closing member 41 are certainly made.
Each of the calcined bodies is fired and shrunk in the lateral direction (circumferential direction of the ceramic discharge tube) in FIG. 7, and the firing shrinkage firmly holds and seals the blocking member 41 and the current conductor 5. However, in the stage of this integral firing, at the same time, the calcined body of the end portion 12 and the calcined body of the sealing material 41 are both fired and shrunk in the direction of arrow E (the direction of the central axis of the ceramic discharge tube). To do. As a result, a large thermal stress is generated and remains between the plugging member 41 and the end portion 12 and between the plugging member 41 and the current conductor 5 when viewed in the direction of the central axis of the ceramic discharge tube.

In particular, high pressure discharge lamps show excellent color rendering properties,
When the coldest point is 700 ° C. or higher, a relatively large strain is generated in the ceramic material. Therefore, when the cycle of lighting and extinguishing is repeated, the effect of the above-mentioned residual stress expands due to this heat cycle, resulting in damage or destruction. There was a possibility of leaking the ionized luminescent material.

Further, in the end portion sealing structure as shown in FIG. 7, basically, the gap between the blocking member 41 and the current conductor 5 is sealed by the pressure between them, but it is still lighted.
Since the extinguishing cycle is repeated many times, it is necessary to further improve the reliability of this sealed portion in view of the difference in thermal expansion coefficient between the two. Therefore, it is necessary to develop a seal structure having high corrosion resistance and reliability especially for metal halides.

The object of the present invention is to solve the above-mentioned problems,
In the sealed structure of the end part of the ceramic discharge tube, even if the lighting and extinguishing are repeated many times, each member at the end part is not damaged and destroyed by this heat cycle, and the ionized luminescent material is not leaked. An object of the present invention is to provide a method for manufacturing a high pressure discharge lamp.

[0010]

A first aspect of the method for manufacturing a high pressure discharge lamp according to the present invention is a ceramic discharge tube having an internal space filled with an ionized luminescent material; and a ceramic discharge tube fixed inside an end of the ceramic discharge tube. A plug having a through hole; a current conductor inserted into the through hole of the plug; a seal provided between the plug and the current conductor A method of manufacturing a high-pressure discharge lamp, comprising: a metallization layer for use in molding, wherein the plugging material is molded, at least a through-hole of the plugging material is coated with a metallizing paste, and the metallizing paste of the plugging material is applied to a predetermined through-hole. After inserting the current conductor into the position and baking the metallizing paste, and then inserting the plugging member to which the electrode conductor is baked and fixed at a predetermined position on the inner surface of the end portion of the calcined ceramic discharge tube, and then integrally firing. It is characterized in.

A second invention of the method for manufacturing a high pressure discharge lamp according to the present invention is a ceramic discharge tube having an internal space filled with an ionized luminescent material; and a plug fixed inside the end of the ceramic discharge tube. A plug having a through hole; a first and a second thermal expansion reducing material provided outside and inside the plug, the inner diameter being larger than the through hole of the plug. A thermal expansion relaxation material provided with a through hole having: a current conductor inserted through the through hole of the closing material and the first and second thermal expansion relaxation materials; between the closing material and the current conductor And a sealing metallization layer provided between the plugging material and the first and second thermal expansion mitigating materials, wherein the plugging material is press-molded at the same time. Press-molding the first and second thermal expansion relaxation materials, Occluder and the first, the metallizing paste into the through hole of the second thermal expansion mitigating member is applied even without,
After drying, the current conductor is inserted into predetermined positions of the through holes of the first thermal expansion relaxation material, the blocking material, and the second thermal expansion relaxation material, and the metallizing paste between the blocking material and the current conductor is baked. Then, at a predetermined position on the inner surface of the end of the separately prepared calcinated ceramic discharge tube, the first thermal expansion relaxation material, the plugging material and the second thermal expansion relaxation material having the electrode conductor baked and fixed were inserted. After that, it is characterized by integrally firing.

In the above-described structure of the present invention, in both the first and second inventions, a metallization layer is provided and fixed between the blocking member and the current conductor so that the metal discharge layer is viewed in the direction of the central axis of the ceramic discharge tube. A highly reliable high-pressure discharge lamp that eliminates the generation and residual of large thermal stress and does not cause damage or destruction of each member at the end due to the heat cycle that occurs when lighting and extinguishing repeatedly and leakage of ionized luminescent material Obtainable. In addition, the metallized layer has a high corrosion resistance to the ionized luminescent material in the ceramic discharge tube, especially to the metal halide, and therefore also serves to prolong the life of the ceramic discharge tube.

Further, in the structure of the second invention, the first thermal expansion relaxation material and the second thermal expansion relaxation material provided on the outer side and the inner side of the closing material are generated by a difference in thermal expansion between the closing material and the metallized layer. It also plays the role of relaxing the stress. In addition, the second thermal expansion relaxation material provided inside the blocking material also serves to reduce the back arc to the metallized layer by protecting the metallized layer exposed in the ceramic discharge tube.

It is to be noted that a glass layer is provided on the metallized layer in contact with the outside air of the occluding material, and the glass is allowed to penetrate into the open pores of the metallized structure, and C chamfering or R chamfering is performed at the corners of the occluding material which contact the ceramic discharge tube. Providing such chamfered portions can be said to be a preferable mode because the reliability of the sealing portion can be further improved.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION First, a high pressure discharge lamp to which the method for manufacturing a high pressure discharge lamp of the present invention can be applied will be described. FIG. 1 is a schematic diagram showing a metal halide high pressure discharge lamp. The ceramic discharge tube 10 is housed in the outer tube 2 made of quartz glass or hard glass, and the center axis of the outer tube 2 matches the center axis of the ceramic discharge tube 10. Both ends of the outer tube 2 are hermetically closed by the bases 3. The ceramic discharge tube 10 has a barrel-shaped main body 11 with a bulged central portion.
And ends 12 at both ends of the body 11. The ceramic discharge tube 10 is held by an outer tube 2 with two lead wires 1 interposed therebetween, 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 a tubular current conductor 5.
Being welded to.

The respective current conductors 5 and 6 are inserted and fixed in the through holes of the respective block members. Each current conductor 5,
An electrode shaft 7 is hermetically connected to 6 by welding in the main body 11. A coil 9 is wound around the electrode shaft 7. The electrode system is not particularly limited, and for example, the end portion of the electrode shaft 7 may be formed into a spherical shape and this spherical portion may be used as an electrode. 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 sealed if necessary.

2 to 4 are sectional views showing the periphery of the end portion of the ceramic discharge tube shown in FIG. 1 in an enlarged manner. FIG. 2 is a view showing an example of an end portion of the ceramic discharge tube obtained by the first invention of the method for manufacturing a high pressure discharge lamp according to the present invention. In FIG. 2, an end portion 12 of a ceramic discharge tube 10 made of, for example, Al ₂ O _{3 is used} .
A disk-shaped closing member 51 made of, for example, cermet is fixed to the inside of the. A through hole 52 is formed in the center of the blocking member 51. Then, the tubular current conductor 6 made of, for example, molybdenum is fixed in the through hole 52 via the metallization layer 53. An electrode 9 such as a coil is provided at the end of the current conductor 6 inside the ceramic discharge tube 10. In this example, a metallized layer 54 continuous with the metallized layer 53 is formed on the main surface 51a outside the occluding member 51. Then, the glass layer 55 is formed on the metallized layer 54.

In the example shown in FIG. 2, the plug 51 and the current conductor 6 are fixed with a metallization layer 53, and the plug 51 and the end 12 of the ceramic discharge tube 10 are thermally expanded during firing. The ceramic discharge tube 10 is fixed by a compressive force from the end portion 12 of the ceramic discharge tube 10 to the blocking member 51 due to the difference. Due to the presence of the metallized layer 53, generation and residual of stress in the direction of the through hole 52 can be eliminated. In this example, the glass layer 55 is formed on the metallized layer 54 and glass having corrosion resistance is permeated into the metallized structure to improve the airtightness and the life. It can be lost. In addition, the example shown in FIG.
It can be suitably used when the inner diameter of the end 12 of the is relatively small.

In the above-mentioned embodiment, first, the occluding material 51 is used.
As the material of, the same kind of material as the ceramic discharge tube 10 can be used, or a different material can be used. However, it is preferable to use the same kind of material because it is possible to reduce the generation and residual of stress in the central axis direction of the ceramic discharge tube 10 between the end portion 12 of the ceramic discharge tube and the blocking member 51. Here, the same type of material means that the base ceramics are common, and the added components may be different.

Next, as the metal component constituting the metallized layers 53 and 54, one or more metals selected from the group consisting of molybdenum, tungsten, rhenium, tantalum and alloys thereof are preferable, and particularly, the metallized layers have corrosion resistance. From the viewpoint, one or more metals selected from the group consisting of molybdenum, tungsten, rhenium and alloys thereof are preferable. A ceramic component may be contained in the metallized layer. As the ceramic component, a ceramic having corrosion resistance to an ionized luminescent material is preferable, and a ceramic of the same kind as the material of the ceramic discharge tube is preferable, and alumina is preferable. Ceramics are particularly preferred. The content ratio of the metal component in this metallized layer is preferably 95/5 to 70/30 volume%. The metallized layers 53 and 54 preferably have a thickness of 5 to 100 μm.

Further, as the current conductor 6, it is possible to use a current conductor made of various high melting point metals or high melting point conductive ceramics. However, a high melting point metal is preferable from the viewpoint of electrical conductivity, and as such a high melting point metal, one or more metals selected from the group consisting of molybdenum, tungsten, rhenium, niobium, tantalum and alloys thereof are more preferable. Among them, the coefficient of thermal expansion of niobium and tantalum is almost in balance with the coefficient of thermal expansion of ceramics, especially alumina ceramics, which constitutes a ceramic discharge tube, but it is known that these metals are easily corroded by metal halides. Therefore, in order to extend the life of the current conductor, molybdenum,
It is preferably formed of 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 , the coefficient of thermal expansion of molybdenum is 6 × 10 ^-6 K ^-1 , and the coefficient of thermal expansion of tungsten and rhenium is 6 × 10 ^-6. It is K ^-1 or less.

FIG. 3 is a diagram showing another example of the end portion of the ceramic discharge tube obtained by the first invention of the method for manufacturing a high pressure discharge lamp according to the present invention. 3 is different from the example shown in FIG. 2 in that the occluding member 51 is composed of a ring-shaped first occluding member 61 having a large diameter and a ring-shaped second occluding member 62 having a small diameter. It is a point. A metallized layer 6 similar to the metallized layers 53 and 54 described above is provided between the first blocker 61 and the second blocker 62 and on the inner end surface of the blocker 51.
3 and 64 are formed and fixed. The coefficient of thermal expansion of the ceramics discharge tube 10 is Tc, and the first plugging material 6 is
When the coefficient of thermal expansion of No. 1 is T1, the coefficient of thermal expansion of the second closing member 62 is T2, and the coefficient of thermal expansion of the current conductor 6 is Tm, T
It is necessary to select the material of each member so as to satisfy the relationship of c ≦ T1 <T2 ≦ Tm.

In the example shown in FIG. 3, the effect of the present invention can be achieved even if the diameter of the plug 51 is large, so that the diameter of the end 12 of the ceramic discharge tube 10 is relatively large. It can be applied suitably. Although the glass layer 55 is provided on the metallized layer 54 also in the example shown in FIG. 3, the metallized layer 54 and the glass layer 55 can be omitted if necessary. In addition, the blocking member 51
Although it is composed of one first blocker 61 and second blocker 62, it goes without saying that the number of radial divisions is not limited to two and may be three or more. However, also in this case, it is necessary to satisfy the relationship of the thermal expansion coefficient.

FIG. 4 is a diagram showing a structure of an example of an end portion of a ceramic discharge tube obtained by the second invention of the method for manufacturing a high pressure discharge lamp according to the present invention. In the example shown in FIG. 4, as compared with the examples shown in FIGS. 2 and 3, the first thermal expansion mitigating material 71 and the second thermal expansion mitigating material 72 are provided on the outer side and the inner side of the blocking member 51. The first thermal expansion mitigating material 71 and the second thermal expansion mitigating material 72 each have the same outer diameter as the outer diameter of the closing material 51 and also have a through hole 73 having an inner diameter larger than the inner diameter of the closing material 51. ing. In addition, the first thermal expansion relaxation material 71
A metallization layer 54 is provided between one main surface of the
Is provided and fixed, and a metallized layer 64 is provided and fixed between one main surface of the second thermal expansion relaxation material 72 and the closing material 51. Further, similarly to the occluding member 51, the first and second thermal expansion relaxation materials 71 and 72 are sealed to the end portion 12 by utilizing the compressive stress at the time of firing the end portion 12 of the ceramic tube 10. .

The first thermal expansion relaxation material 71 in this example is
It plays the role of a backup ring that relieves stress in the central axis direction of the end 12 of the ceramic discharge tube 10.
In addition, the second thermal expansion relaxation material 72 functions as the backup ring and protects the metallized layer 64 exposed in the ceramic discharge tube 10 to thereby prevent the metallized layer 6 from being exposed.
It also plays the role of reducing the occurrence of back arc for No. 4. The materials of the first thermal expansion mitigating material 71 and the second thermal expansion mitigating material 72 are not particularly limited, but are preferably made of the same material as the ceramic discharge tube 10, for example, Al ₂ O ₃ .

In the example shown in FIG. 4, the glass 5 is provided between the current conductor 6 and the first thermal expansion relaxation material 71 provided on the metallized layer 54 of the occluding material 51 and outside the occluding material 51.
5 is provided so that the exposed metallized structure is infiltrated with glass. Further, a chamfered portion 74 is formed at a corner portion of the first thermal expansion relaxation material 72 which is in contact with the end portion 12 of the ceramic discharge tube 10. The chamfered portion 74 may have a shape such as a C chamfer as shown in the figure as well as an R chamfer. By providing such a chamfered portion 74, stress concentration between the corners of each member and the end 12 of the ceramic discharge tube 10 can be relaxed, and breakage at the corners can be eliminated. Also in this example, as shown in FIG. 3, the blocking member 51 may be composed of a plurality of members.

The first invention and the second invention of the method for manufacturing a high pressure discharge lamp according to the present invention will be described below with reference to the flowcharts shown in FIGS. The first invention of the method for manufacturing a high-pressure discharge lamp shown in FIG. 5 relates to the method of manufacturing a high-pressure discharge lamp having an end structure shown in FIG. 2, and the second invention of the method for manufacturing a high-pressure discharge lamp shown in FIG. The present invention relates to a method for manufacturing a high pressure discharge lamp having an end structure shown in FIG.

Regarding the manufacturing method of the first invention: First, referring to FIG.
In the above, the cermet ring molded body to be the blocking member 51 is granulated with a spray dryer or the like to obtain powder of 2000 to
Obtained by press molding at a pressure of 3000 Kgf / cm ² . The obtained molded body is heated at a temperature of 600 to 800 ° C. to remove the binder. Next, the molded body that has been subjected to the binder removal treatment is subjected to deoxidation treatment at a temperature of 1200 to 1400 ° C. in a hydrogen reducing atmosphere to obtain a cermet ring.
This deoxidizing treatment is intended to give the cermet ring a certain level of strength, prevent paste leveling failure due to solvent suction at the time of applying the paste below, and enhance the handling property of the cermet ring.

Next, through hole printing is performed on the inner surface of the through-hole of the obtained cermet ring to print a metallizing paste composed of Mo: 90 vol%, Al ₂ O ₃ : 10 vol%, a small amount of binder and a solvent. . This through hole printing is
Apply the metallizing paste around one side of the through hole, draw a vacuum from the other end of the through hole, pull the metallizing paste into the through hole, and print the metallizing paste on the entire inner surface of the through hole. There is. The cermet ring after this through hole printing is dried at a temperature of about 120 ° C. Next, end face printing is performed by printing metallizing paste on one of the main surfaces of the cermet ring. This end face 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 1400 to 1400.
Pre-baking is performed in a reducing atmosphere having a dew point of 20 to 50 ° C. at a temperature of 1600 ° C. Next, a cermet ring preliminarily fired and fixed with a Mo pipe or rod was inserted into the end surface of the alumina tube obtained by previously removing the binder and calcination of the alumina formed body, and set at a predetermined position, 1600 to 1900. ℃
The high pressure discharge lamp of the present invention is obtained by performing the main firing in a reducing atmosphere having a dew point of −10 to 20 ° C. It should be noted that the metallized structure after the main firing may be permeated with glass having corrosion resistance to improve the airtightness and the life, and the structure shown in FIG. 2 is one example. Note that the preforming and the main firing are performed in different steps in order to prevent the binder in the metallizing paste from contaminating the alumina tube and to align the electrodes.

Regarding the manufacturing method of the second invention: First, referring to FIG.
In the above, the cermet ring molded body to be the blocking member 51 is granulated with a spray dryer or the like to obtain powder of 2000 to
Obtained by press molding at a pressure of 3000 Kgf / cm ² . The obtained molded body is heated at a temperature of 600 to 800 ° C. to remove the binder. Next, the molded body that has been subjected to the binder removal treatment is subjected to deoxidation treatment at a temperature of 1200 to 1400 ° C. in a hydrogen reducing atmosphere to obtain a cermet ring.
This deoxidizing treatment is intended to give the cermet ring some strength, prevent paste leveling failure due to the blowing of a solvent at the time of applying the paste described below, and enhance the handling property of the cermet ring.

Next, through-hole printing is performed on the inner surface of the through-hole of the obtained cermet ring to print a metallizing paste composed of Mo: 90 vol%, Al ₂ O ₃ : 10 vol%, a small amount of binder and a solvent. . This through hole printing is
Apply the metallizing paste around one side of the through hole, draw a vacuum from the other end of the through hole, pull the metallizing paste into the through hole, and print the metallizing paste on the entire inner surface of the through hole. There is. The cermet ring after this through hole printing is dried at a temperature of about 120 ° C. Next, end face printing in which metallizing paste is similarly printed on both main faces of the cermet ring, and the cermet ring after the end face printing is dried. The end surface printing on both main surfaces is performed by performing end surface printing on one main surface and then performing the same end surface printing on the other main surface, and by performing each end surface printing twice.

In parallel, two alumina rings to be the first and second thermal expansion relaxation materials 71 and 72 are prepared. Alumina ring is 600-800 with respect to the alumina ring molded body obtained by press-molding powder granulated by a spray dryer or the like at a pressure of 2000-3000 Kgf / cm ^2.
The binder is removed by heating at a temperature of ℃
It is obtained by performing calcination in a hydrogen reducing atmosphere at a temperature of 0 to 1500 ° C. The obtained alumina ring is subjected to metallization printing only on both main surfaces. Thereafter, the alumina ring is not dried, but the alumina ring, the cermet ring prepared as described above, and the alumina ring are laminated in this order with a slight load applied and dried 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 1400 to 1600 ° C.
Pre-baking is performed in a reducing atmosphere having a dew point of 20 to 50 ° C. Next, a cermet ring preliminarily fired and fixed with a Mo pipe or rod was inserted into the end surface of the alumina tube obtained by previously removing the binder and calcination of the alumina formed body, and set at a predetermined position, 1600 to 1900. The high-pressure discharge lamp of the present invention is obtained by carrying out main firing at a temperature of ° C in a reducing atmosphere having a dew point of -10 to 20 ° C. It should be noted that the metallized structure after the main firing may be permeated with glass having corrosion resistance to improve the airtightness and the life, and the structure shown in FIG. 4 is one example.

In the above-mentioned embodiments, the molding is performed by press molding, but it goes without saying that this molding is not limited to press molding. Further, although the metallizing paste is applied to the green compact, the application of the metallizing paste is not limited to the green compact.

[0036]

As is apparent from the above description, according to the present invention, a ceramic discharge tube having an internal space filled with an ionized luminescent material, a plugging material for sealing an end portion of the ceramic discharge tube, and a plugging member. In a high-pressure discharge lamp equipped with a current conductor with an electrode system that is layered through the material through-hole, damage, destruction, and ionized light emission of each member at the end due to this heat cycle It is possible to obtain a highly reliable end structure in which material leakage is unlikely to occur.

[Brief description of drawings]

FIG. 1 is a diagram showing an example of the overall structure of a high pressure discharge lamp which is a target of a manufacturing method of the present invention.

FIG. 2 is a diagram showing an example of an end portion of a ceramic discharge tube obtained by the first invention of the method for manufacturing a high pressure discharge lamp according to the present invention.

FIG. 3 is a view showing another example of the end portion of the ceramic discharge tube obtained by the first invention of the method for manufacturing a high pressure discharge lamp according to the present invention.

FIG. 4 is a diagram showing an example of an end portion of a ceramic discharge tube obtained by the second invention of the method for manufacturing a high pressure discharge lamp according to the present invention.

FIG. 5 is a flowchart showing a process sequence of the first invention of the manufacturing method of the present invention.

FIG. 6 is a flow chart showing a process sequence of the second invention of the manufacturing method of the present invention.

FIG. 7 is a diagram showing a structure around an end portion of a conventional ceramic discharge tube.

[Explanation of symbols]

51 Blocking Material, 51a Main Surface, 52 Through Hole, 53, 5
4 metallized layer, 55 glass layer, 61 first blocker, 62 second blocker, 63 metallized layer, 71 first thermal expansion relaxation material, 72 second thermal expansion relaxation material, 73 through hole, 75 chamfer Department

Claims (9)

[Claims] 1. A ceramic discharge tube having an internal space filled with an ionized luminescent material; a plugging material fixed to the inside of an end of the ceramic discharge tube, the plugging material having a through hole. A method for manufacturing a high-pressure discharge lamp, comprising: a current conductor inserted into the through hole of the plug; and a sealing metallization layer provided between the plug and the current conductor, wherein the plug A material, at least a metallizing paste is applied to the through-holes of the plugging material, the current conductor is inserted into a predetermined position of the through-holes to which the metallizing paste of the plugging material is applied, and the metallizing paste is baked, and then separately prepared. At a predetermined position on the inner surface of the end of the calcined ceramic discharge tube,
After inserting the occluding material fixed by baking the electrode conductor,
A method for manufacturing a high-pressure discharge lamp, which comprises integrally firing. 2. The ceramic discharge tube when the metallizing paste is fixed to the inner surface of the end of the ceramic discharge tube of the two main surfaces of the plug orthogonal to the through holes of the plug. The coating is also applied to the outer main surface.
A method for manufacturing the high pressure discharge lamp described. 3. The method for manufacturing a high pressure discharge lamp according to claim 2, wherein glass is impregnated into the metallized layer provided on the main surface of the plugging material after the integral firing. 4. The method for manufacturing a high pressure discharge lamp according to claim 1, wherein a chamfered portion is provided at a corner portion of the plugging material which is in contact with the ceramic discharge tube, and then integrally fired. 5. A ceramic discharge tube having an inner space filled with an ionized luminescent material; a plugging material fixed to the inside of an end of the ceramic discharge tube, the plugging material having a through hole. The first and second thermal expansion relaxation materials provided on the outer side and the inner side of the closure material, the thermal expansion relaxation material having a through hole having an inner diameter larger than the through hole of the closure material; A current conductor inserted through the through-holes of the occluding material and the first and second thermal expansion mitigating materials; between the occluding material and the current conductor, and the occluding material and the first and second thermal expansion mitigating materials A method of manufacturing a high-pressure discharge lamp, comprising: a sealing metallization layer provided between the first and second thermal expansion relaxation materials, and at least the first and second thermal expansion relaxation materials. In addition, the through holes of the first and second thermal expansion relaxation materials have A rise paste is applied, the current conductor is inserted into predetermined positions of through holes of the first thermal expansion relaxation material, the blocking material, and the second thermal expansion relaxation material, and metallization between the blocking material and the current conductor is performed. A first thermal expansion relaxation material, a plugging material, and a second thermal expansion relaxation material in which the electrode conductor is baked and fixed at a predetermined position on the inner surface of the end portion of the calcined ceramic discharge tube prepared by baking the paste. A method for manufacturing a high-pressure discharge lamp, comprising: 6. The metallizing paste is provided with two main surfaces of a blocking member which are orthogonal to the through hole, and a first portion which is orthogonal to the through hole.
7. The method for manufacturing a high pressure discharge lamp according to claim 6, wherein, of the two main surfaces of the second thermal expansion relaxation material, the main surface facing the blocking material is applied. 7. A glass is provided between the through hole of the first thermal expansion relaxation material provided on the metallization layer of the blocker after the integral firing and outside the blocker and the current conductor. The method for manufacturing a high pressure discharge lamp according to claim 5, wherein the high pressure discharge lamp is permeated. 8. The integrated firing according to claim 5, wherein chamfered portions are provided at corners of the plugging material and the ceramic discharge tubes of the first and second thermal expansion mitigating materials, which are then integrally fired. High-pressure discharge lamp manufacturing method. 9. The sealing material is composed of a plurality of ring members having different diameters, a metallizing paste is applied between the plurality of ring members to assemble, and then integrated by baking the metallizing paste. The method for manufacturing a high pressure discharge lamp according to any one of 1.