JP2002063867A - Lead-in body for lamp, and lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture an electricity lead-in body for a quartz glass, without having to use a means such that laminates the mixture of powders of insulating inorganic material and conductive inorganic material with different mixing ratio successively like gradient function material, or deposits the slurry of above materials with concentration gradient utilizing the phenomenon that the deposition speed differs in accordance with gravity. SOLUTION: To the holes formed at both bottom surface of an approximately columnar sealing body 22 made of quartz glass as a main component, processed by sintering insulating material with a thermal expansion coefficient smaller than that of quartz glass and conductive material with thermal expansion coefficient larger than that of quartz glass, an inner lead 13 with an electrode 15 at its top end and an outer lead 14 supplying electricity from outside, are inserted. The lead-in body for a lamp is characterized by fixing the contacting part of the sealing body, the outer lead, and the inner lead by sintering with the interposition of metallic member.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric power guide for a lamp such as a discharge lamp or a halogen lamp. The lamp electricity introducing body referred to in the present application is a structure in which a sealing body is combined with an internal lead and an external lead.

[0002]

2. Description of the Related Art Conventionally, as a sealing body used for a sealing portion of a lamp having an arc tube made of quartz glass, Japanese Patent Application Laid-Open No.
A seal made of a functionally graded material as disclosed in Japanese Patent No. 172514 has been proposed. The sealed body made of a functionally graded material uses a region of an insulating component having a coefficient of thermal expansion similar to that of quartz glass at a joint with an arc tube, and gradually or stepwise changes the coefficient of thermal expansion to the insulating component. The sealing body has a configuration in which the mixing ratio of the conductive component is increased until the coefficient of thermal expansion approximates the coefficient of thermal expansion of the electrode material.

[0003] According to the sealed body having these structures, the arc tube and the insulating component side of the sealed body having a coefficient of thermal expansion close to that of quartz glass are melted by a heating means such as an oxygen-hydrogen burner. Can be joined, as shown in FIG.
The arc tube 10 of the discharge lamp 1 and the sealing body 12 can be joined at the welding portion 2. Reference numeral 13 denotes an internal lead, 14 denotes an external lead, and 15 denotes an electrode formed by winding a coil around the tip of the internal lead 14. Reference numeral 13 denotes an internal lead, and reference numeral 14 denotes an external lead. Each of the leads is sintered and fixed to the sealing body 12 when the sealing body 12 is sintered.

In the case where the sealing member made of a functionally gradient material is used for a sealing portion of a lamp, a power supply path from the outside of the lamp to the arc tube is formed by connecting one end of an internal lead to a region where the conductive component of the functionally gradient material is large. Since one end of each of the external leads is hardened in a state where the external leads reach each other, it is ensured well. Further, since the arc tube and the insulating component side of the sealing body having a coefficient of thermal expansion similar to that of quartz glass are fusion-bonded, airtightness is ensured.

However, when a functionally graded material is used for a sealing body, it takes a lot of time to manufacture the functionally graded material. This is because the gradient functional material has a laminated structure that reduces the difference in the coefficient of thermal expansion between the arc tube material and the electrode material, so that a predetermined number of layers of powder in which the ratio of the insulating component and the conductive component is changed is prepared. , Each powder is weighed in order, put in a cylindrical mold and pressurized to perform powder molding, or a slurry made by determining the ratio of the insulating component and the conductive component is a gypsum mold having columnar cavities It is necessary to take measures such as imparting a concentration gradient in the axial direction by utilizing the difference in the precipitation rate between the insulating component particles and the conductive component particles.

As a technique for sealing a lamp having an arc tube other than quartz glass, a high-pressure sodium lamp or a metal halide lamp using a translucent alumina tube for the arc tube, as shown in FIG. It is widely known to use a cermet obtained by mixing and sintering a conductive component with a sealing component 22. (For example, 2-12
See No. 9662. In FIG. 2, reference numeral 20 denotes an arc tube, 23 denotes an internal lead, 24 denotes an external lead, and 25 denotes an electrode. The arc tube 20 and the sealing body 22 are sealed with a frit 26.

When this cermet sealing body is used for a lamp, a power supply path into the arc tube from the outside of the lamp is such that the cermet has conductivity, and one end of the internal lead and one end of the external lead are sealed with the cermet. It is secured because it is fired in the form of reaching the middle of the stop. The arc tube and the sealing body are hermetically sealed with a frit.

However, the coefficient of thermal expansion of the cermet is close to the coefficient of thermal expansion of the arc tube material in order to prevent the arc tube from cracking. In the case of an alumina arc tube, the coefficient of thermal expansion of alumina is 76 × 10 ⁻⁷ (1 / K), and the coefficient of thermal expansion of the cermet is in the range of about 70 to 80 × 10 ⁻⁷ (1 / K). . Usually, the conductive component used in these cermets is a high melting point metal, and W and Mo are generally used. The coefficient of thermal expansion of W or Mo is around 40 × 10 ⁻⁷ (1 / K), and in order to obtain a cermet having a coefficient of thermal expansion close to that of the above-mentioned alumina, the thermal expansion coefficient is larger than that of W or Mo. By adjusting the mixing amount of the components, the coefficient of thermal expansion is increased. When alumina is used as a main component, many insulating component materials having a high coefficient of thermal expansion are used for the additive material, and cermets for an alumina arc tube are technically easy.

In a lamp having an arc tube made of quartz glass, the use of the above-described sealing body made of a functionally graded material is more effective than the conventional sealing method of Mo foil sealing. Does not cause eccentricity from the axis center, or
This is an excellent method that has an advantage that the length of the sealing portion can be shortened. However, the functionally graded material has a drawback that the efficiency of industrial production is low, in which a plurality of mixed layers of a conductive powder material and an insulating powder material whose compositions are sequentially changed are laminated and sintered.

However, in the case of a lamp having an arc tube made of quartz glass, when considering a material that can be used in place of a cermet used for a ceramic lamp, sufficient heat resistance can be obtained at the temperature of the sealed portion of the lamp during operation. The conductive component having a relatively low coefficient of thermal expansion has to be W or Mo. However, these W and Mo have a coefficient of thermal expansion of about 40 × 10 ⁻⁷ (1 / K) as described above. On the other hand, the thermal expansion coefficient of quartz glass is 5 × 10 ⁻⁷ (1 / K), which is different by one digit.

A cermet replacement material for a quartz glass arc tube requires at least 15% by volume to achieve practical conductivity.
Is required to be mixed with the quartz glass powder, but the thermal expansion coefficient of the completed cermet substitute material is about 23 × 10 ⁻⁷ (1 / K) as a measured value. The difference from the coefficient of thermal expansion is too large to use.

That is, when quartz glass is directly joined to a cermet substitute material made of W or Mo and quartz glass,
Cracks occur on the quartz glass side due to the difference in thermal expansion, and airtightness cannot be maintained. According to the idea of the conventional cermet production, the thermal expansion coefficient of quartz glass itself is low, so the thermal expansion coefficient of cermet substitute material that can be made by mixing anything as a conductive component is not limited to W or Mo. There is a cermet alternative material that can be used practically, that is, an electric introducing body made of a cermet alternative material that is hermetically sealed with a quartz glass arc tube and ensures power supply to the arc tube without any problem. Did not.

[0013]

Therefore, in the present invention,
As in the case of functionally graded materials, powders with different mixing ratios of the insulating inorganic material component and the conductive inorganic material component are sequentially laminated, or a slurry in which both are mixed is produced, and the speed of deposition by gravity differs. It is sealed with a quartz glass arc tube with good airtightness without using a means to incline the concentration of the insulating inorganic material component and the conductive inorganic material component using the phenomenon, and it can be used without problem for power supply to the arc tube The aim was to produce an electrical conductor for quartz glass that could be made.

In other words, a means for reducing the coefficient of thermal expansion of the cermet replacement material to a coefficient of thermal expansion close to that of quartz glass even when W or Mo is used is obtained, and the cermet replacement material or the cermet replacement material is combined with quartz. It is an object of the present invention to provide a lamp electric introducer made of a glass joined body and a lamp using the same.

[0015]

In order to solve the above-mentioned problems, the invention according to claim 1 seals a sealing portion of a lamp having a quartz glass arc tube and introduces a current into the arc tube. A substantially columnar conductive material which is an electrical conductor for a lamp and is sintered from an insulating material having a thermal expansion coefficient smaller than that of quartz glass and a conductive material having a thermal expansion coefficient larger than that of quartz glass. An internal lead having an electrode at the tip and an external lead for supplying power from outside the lamp are inserted into holes formed on both bottom surfaces of the sealed body, and the sealed body and the external lead are inserted into the quartz sintered body. And the contact portion of the internal lead
A lamp electric introducer characterized by being fixed by sintering with a metal member interposed therebetween.

Here, the conductive quartz sintered body is a sintered body having quartz glass as a main component, containing a conductive metal component and having conductivity, which is applied to a sealing body of a lamp having a quartz glass arc tube. It is the binding material.

According to a second aspect of the present invention, there is provided a lamp electric introducer for enclosing a sealing portion of a lamp having a quartz glass arc tube and for introducing a current into the arc tube, wherein quartz glass is a main component. A region consisting of an electrically conductive quartz sintered body having a coefficient of thermal expansion close to that of quartz glass, sintered from an insulating material having a coefficient of thermal expansion smaller than that of quartz glass and a conductive material having a coefficient of thermal expansion larger than that of quartz glass And a region formed of sintered quartz glass, and a sealing formed by joining the two so that one end is a region formed of the conductive quartz sintered body and the other end is a region formed of the sintered quartz glass. An internal lead having an electrode at the tip and an external lead for supplying power from outside the lamp are inserted into holes formed on both bottom surfaces of the sealing body, and contact portions of the sealing body with the external lead and the internal lead are inserted into the body. Is used for sintering with metal members It is an lamp electric transductant characterized by comprising fixed Ri.

According to a third aspect of the present invention, the conductive quartz sintered body is made of a material having a composition in which at least one of TiO _2, ZrO _{2, and} HfO ₂ is added to quartz glass as an insulating material. Mo or W as conductive material
The lamp according to claim 1 or 2, wherein the main component is a material mainly composed of:

According to a fourth aspect of the present invention, the lamp lamp according to any one of the first to third aspects and the quartz glass arc tube are joined by melting the quartz glass of the arc tube. A lamp characterized by the above.

According to a fifth aspect of the present invention, in the conductive quartz sintered body in contact with an oxidizing atmosphere, an oxidation resistant film having a coefficient of thermal expansion close to the coefficient of thermal expansion of the conductive quartz sintered body is formed. A lamp according to claim 4, characterized in that:

According to a sixth aspect of the present invention, the surface of the conductive quartz sintered body facing the light emitting space is coated with quartz glass or glass containing quartz glass as a main component. 4. The lamp according to item 4.

[0022]

[Function] An arc tube made of quartz glass is made of an insulating material having a thermal expansion coefficient smaller than quartz glass containing quartz glass as a main component and a conductive material having a thermal expansion coefficient larger than quartz glass. By using a conductive quartz sintered body having a coefficient of expansion (a mixture of a conductive component and an insulating component) as an electroinductor and bonding it to quartz glass for sealing, the cost is low, Since the degree of stress relaxation between the arc tube and the arc tube is small, reliability can be improved.

The above-mentioned sealing body has a sealing structure in which one end is made of a conductive quartz sintered body and the other end is a sintered quartz glass, so that the arc tube and the sintered quartz glass portion of the sealing body are joined. Can be further facilitated as compared with the case where only the conductive quartz sintered body is used.

[0024] Since cracks due to different coefficients of thermal expansion are liable to occur in the contact portion between the sealing body made of the conductive quartz sintered body and the external lead or the internal lead, the conductive quartz is provided by interposing a metal member. Cracks on the sintered body side can be prevented.

By using the sealed body made of the conductive quartz sintered body, when the quartz glass arc tube is manufactured by sintering, it has a thermal expansion coefficient close to that of quartz glass. And airtightness can be taken.

When an anti-oxidation film having a coefficient of thermal expansion similar to the coefficient of thermal expansion of the conductive quartz sintered body is formed on the conductive quartz sintered body, even at a temperature at which oxidation of W or Mo becomes severe in an oxidizing atmosphere. Oxidation of the sealing body can be prevented.

The portion facing the light emitting space is covered with quartz glass or glass containing quartz glass as a main component, so that the reaction between the metal component of the conductive quartz sintered body and the enclosure is prevented. In particular, it is possible to prevent the conductive component of the fused silica sintered body from moving to the light emitting space, and to maintain a stable light emitting spectrum for a long time.

[0028]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A description will be given of the manufacture of a lamp electric guide made of a conductive quartz sintered body according to a first embodiment of the present invention. FIG.
This is shown in (b). FIG. 6 shows a composition example of the formed conductive quartz sintered body. From the viewpoint of the table in FIG. 6, the leftmost column indicates that the main component of the insulating component is SiO ₂ , the second column from the left indicates each oxide as an additional insulating component, and the left column indicates from the left. The third column shows the addition ratio of the added insulating component, and then shows the thermal expansion coefficient of the entire insulating component and the mixing ratio of Mo as the conductive component. The ratio between the conductive component and the insulating component is 15:85 in volume%. Further, the coefficient of thermal expansion of the conductive quartz sintered body is shown.

The SiO ₂ powder and the selected additional insulating component powder are mixed in advance, and then the conductive component powder is added and mixed. Mixing is performed using a blender or a ball mill. Experimentally, mixing with a mortar can be used.
After the mixing is completed, stearic acid is added as a binder, mixed by heating, and granulated. Here, W is used as the conductive component, but another refractory metal such as Mo may be used.

In the powder molding, a temporary molded body 30 having a shape as shown in FIG. 3A is molded by using a press die (not shown). Here, the pressure during powder molding is 100 MPa
It is in the range of 200 MPa. Reference numerals 31 and 32 denote holes for inserting internal leads and external leads, respectively. After molding, the internal lead 13 and the external lead 14 are inserted and set on a jig (not shown) for temporary sintering. The sintering is performed by raising the temperature to about 1000 ° C. in a non-oxidizing or reducing atmosphere.

Hole 3 of inner lead 13 and outer lead 14
Insertion into 1 and 32 may be performed after temporary sintering. Note that at least portions of the inner lead 13 and the outer lead 14 inserted into the holes 31 and 32 of the temporary molded body 30 are:
Electrical contact is made through a powder such as W or Mo, or through a foil or ribbon or wire of W or Mo. The intervening material is not limited to W or Mo, and other high melting point metals or alloys of high melting point metals may be used. FIG. 3B is an overall cross-sectional view of the lamp electric introduction body 3.
Mo as a metal member 16 is provided on the outer surface located inside
This shows a state in which the foil is wound.

After the preliminary sintering, a slurry containing SiO ₂ is applied to the surface of the temporary sintered body. The slurry containing SiO ₂ is composed of SiO ₂ , about 1% nitrocellulose and butyl acetate, and the method of applying this is by dipping. However, a method such as spraying may be used. After the above coating operation, the main sintering is performed. In this sintering, the temperature is raised to about 1700 to 2000 ° C. under reduced pressure (10 ⁻² Pa or less) or in a reducing atmosphere, a non-oxidizing atmosphere, or the like. After sintering, the oxidation resistant film 17 shown in FIG. 3B is formed. The oxidation resistant film 17 is a film whose main component is quartz glass and whose thermal expansion coefficient is close to that of the conductive quartz sintered body.

[0033] As described above, to produce a lamp electric introducer 3 made of a conductive quartz sintered body shown in FIG. 3 (b), as the procedure, the added insulating component and SiO ₂ as the main component Glass may be melted in advance, and crushed glass may be used as an insulating component.

The table in FIG. 6 shows the presence or absence of cracks generated in the conductive quartz sintered body during the bonding test with quartz glass. SiO ₂ and an additional insulating component are added as insulating components according to the addition ratio (mol%), and then Mo, which is a conductive component, is mixed at 15% by volume of the total of the insulating component and the conductive component. Thermal expansion coefficient (× 10 ⁻⁷ (1 / K)) of each of the sintered conductive quartz sintered bodies
And the presence / absence of a crack (× if a crack occurs, ○ if no crack occurs).

Here, those without cracks are not airtight.
It becomes a good sealing body for lamps. No crack
Is the coefficient of thermal expansion of quartz glass of 5 × 10^-7Close to (1 / K)
It has a coefficient of thermal expansion. Depending on the added insulating component,
The main component of the additional insulating component SiO when cracks occur
_TwoWas different. Do not add additional insulating components
Not SiO_TwoAnd W only, the thermal expansion of the conductive quartz sintered body
20 × 10^-7(1 / K), quartz glass
Cracks occurred in the bonding test with

[0036] Examination of what has become no cracks conductive quartz sintered body, the main component SiO ₂ powder, TiO _2,
The insulating material in the mixed state of the additive insulating component powder selected from ZrO ₂ , HfO _{2, and the} like has a thermal expansion coefficient smaller than that of quartz glass, and the insulating material has a thermal expansion coefficient smaller than that of quartz glass. W powder was mixed as a large conductive component powder.

Specifically, 5 mol of ZrO ₂ is added to SiO _2.
% Or 10 mol%, and then mixed with 15 vol% of W, and SiO ₂ added with 5 mol% or 10 mol% of HfO ₂ and mixed with 15 wt% of W
After mixing and adding 10 mol% or 15 mol% of TiO ₂ to SiO ₂ and mixing, W is 15 vol%
It was a mixture.

Next, a description will be given of a second embodiment of the present invention, which is a method of manufacturing a lamp electric guide comprising a composite of sintered quartz glass and conductive quartz sintered body. The electric conductor for lamps, which is composed of a composite of sintered quartz glass and conductive quartz sintered body, has a conductivity similar to that of quartz glass and a coefficient of thermal expansion in order to more reliably join the quartz glass, which is the arc tube. An airtight portion made of a quartz sintered body and a joint made of sintered quartz glass are joined at the time of sintering, and sealing with an arc tube is performed with the joint. FIG. 4 (b) is an overall cross-sectional view of a lamp electric introducing body made of a composite of sintered quartz glass and conductive quartz sintered body.

FIG. 7 shows an example of the composition of the composite body of the sintered quartz glass and the conductive quartz sintered body. How to read FIG.
The leftmost column shows the components of the joint, and then the components of the airtight portion. Indicating that the main component of the insulating component is SiO ₂ , each oxide as an additional insulating component is described,
The proportion of the added insulating component, The thermal expansion coefficient of the entire insulating component and the mixing ratio of Mo as the conductive component are shown. The ratio of the conductive component to the insulating component is 15: 8 by volume.
The ratio is 5.

The powder for forming the hermetically sealed portion, that is, the region of the conductive quartz sintered body, is prepared by mixing the SiO ₂ powder and the additional insulating component powder in advance, and then adding and mixing the conductive component powder. Mixing is performed using a blender or a ball mill. Experimentally, mixing with a mortar can be used.
After the mixing is completed, stearic acid is added as a binder, mixed by heating, and granulated. The powder for forming the joint or sintered quartz glass area is SiO ₂
Stearic acid as a binder is added to the powder, mixed by heating, and granulated.

In the powder molding, a granulated powder of SiO ₂ forming the joint is weighed and filled by using a press die, and then the granulated powder of the airtight portion is weighed and filled. Press forming,
A temporary molded body 50 having a shape as shown in FIG. Here, the pressure during powder molding is 100 MPa to 20 MPa.
The range is 0 MPa. 53 and 54 are holes for inserting internal leads and external leads, respectively. Reference numeral 51 denotes a bonding portion (quartz glass region) and reference numeral 52 denotes an airtight portion (conductive quartz sintered body region). After molding, the inner leads 13 and the outer leads 1
4 is inserted into the holes 53 and 54 and set in a jig for temporary sintering. Pre-sintering is performed in a non-oxidizing or reducing atmosphere for about 10
Raise the temperature to 00 ° C.

The hole 5 of the inner lead 13 and the outer lead 14
Insertion into 3, 54 may be performed after temporary sintering. At least a portion of the inner lead 13 and the outer lead 14 inserted into the airtight portion 52 side is made to make electrical contact via a powder such as W or Mo, or via a foil or ribbon or wire of W or Mo. To The intervening material is not limited to W or Mo, and another high melting point metal or an alloy of a high melting point metal may be used.

After the preliminary sintering, a slurry containing SiO ₂ is applied to the surface of the temporary sintered body. The slurry containing SiO ₂ is composed of SiO ₂ , about 1% nitrocellulose and butyl acetate, and the method of applying this is by dipping. However, a method such as spraying may be used. After the above-mentioned coating operation, the main sintering is performed. This sintering is
The temperature is raised to about 1700 to 2000 ° C. under reduced pressure (10 ⁻² Pa or less) or in a reducing atmosphere, a non-oxidizing atmosphere, or the like. After sintering, the oxidation resistant film 17 shown in FIG. 4B is formed. An oxidation resistant film 17 is also formed near the protruding portion of the external lead 14 from the conductive quartz sintered body. As described above, the lamp electrical introducer 4 having a structure in which the sintered quartz glass and the conductive quartz sintered body having a thermal expansion coefficient similar to that of the quartz glass are manufactured, is manufactured. As a procedure, SiO ₂ as the main component and the added insulating component may be melted as glass in advance, and the ground glass may be used as the insulating component.

In order to prevent the surface of the external lead 14 mainly made of W or Mo from being oxidized, the temperature near the protruding portion of the external lead 14 from the conductive quartz sintered body when the lamp is turned on exceeds 350 ° C. In the case of a lamp under use conditions, another oxidation-resistant film is formed in addition to the above-described oxidation-resistant film.
The glass used as the other oxidation-resistant film is mainly hard glass having a thermal expansion coefficient equivalent to that of W or Mo. A method of once forming a powder and then forming and applying a slurry, or a method using glass beads Is welded. In this case, after the main sintering is completed, an oxidation resistant film is formed.

The table in FIG. 7 shows the presence or absence of cracks generated in the conductive quartz sintered body when a bonding test with quartz glass was performed. If there is no crack, a sealed body for a lamp having good airtightness is obtained. Depending on the added insulating component, the ratio of the added insulating component to the main component SiO ₂ in the case where cracks occurred was different. SiO ₂ and W without added insulating component
In the case of only the system, the coefficient of thermal expansion of the conductive quartz sintered body was also 20 × 1.
It exceeds 0 ^-7 (1 / K), and cracks occur in the bonding test with quartz glass.

[0046] Examination of what has become no cracks conductive quartz sintered body, the main component SiO ₂ powder, TiO _2,
The insulating material in the mixed state of the additive insulating component powder selected from ZrO ₂ , HfO _{2, and the} like has a thermal expansion coefficient smaller than that of quartz glass, and the insulating material has a thermal expansion coefficient smaller than that of quartz glass. W powder was mixed as a large conductive component powder. Specifically, those W is mixed 15% by volume after mixing the ZrO ₂ was added 5 mol% or 10 mol% to SiO _2, H a SiO ₂
fO ₂ of 5 mol% or 10 mol% is added and mixed, then W is mixed at 15 vol%, SiO ₂ is mixed with Ti
After adding and mixing 10 mol% or 15 mol% of O ₂ , 15 vol% of W was mixed.

The production of a lamp using the lamp electric introducer of the present invention is performed as follows. FIGS. 5A and 5B show the structure of the sealed portion of the completed lamp.
The method of manufacturing the lamp shown in FIG. The conductive quartz sintered body used here had an insulating component of 85 vol.
%, And 15 vol% of a conductive component. SiO ₂ and HfO ₂ were mixed at a molar ratio of 9: 1 as insulating components, and W was used as a conductive component. Mo foil as the metal member 16 is wound around the inner lead 13 and the outer lead 14 provided at the tip of the electrode in a ribbon shape and welded, and inserted into the conductive quartz sintered body sealing body 3. Then, heat treatment is performed in a reducing atmosphere or in a vacuum.

The external lead 14 mainly made of W or Mo has a temperature of 350 ° C. in the vicinity of the protruding portion of the external lead 14 from the conductive quartz sintered body when the lamp is turned on, in order to prevent oxidation of the surface of the external lead. In the case of a lamp having a use condition exceeding the above, another oxidation-resistant film is formed in addition to the above-mentioned oxidation-resistant film. Glass used as another oxidation-resistant film,
Hard glass having a thermal expansion coefficient equivalent to that of W or Mo is mainly used, and there is a method of once forming a powder and then forming and applying a slurry, or a method of welding glass beads. In this case, after the main sintering is completed, an oxidation resistant film is formed.

Then, the position of the electrode 15 is matched with the counter electrode (not shown) in the quartz glass arc tube 10 which has been subjected to the vacuum heat treatment in advance. One end (not shown) of the arc tube 10 is closed, and exhaust is performed from the other end 55 of the arc tube. After the inside of the arc tube 10 is once filled with Ar or the like, Hg or a metal halide or the like is introduced into the glove box as needed. Then, the inner surface of the sealing portion 22 on the other end side 55 of the arc tube 10 and the lamp electricity introducing body 3 are welded. Reference numeral 60 denotes a quartz tube for fixing the external lead 14.

For example, in the case of a high-pressure mercury lamp, the mercury amount is 17 mg, the amount of bromine introduced is 3 μg, and the gap between electrodes is 1.2 mm when the inner volume of the arc tube is 120 mm ² . After sealing part sealing,
The end of the sealing portion is cut, and a base (not shown) is attached. The characteristics of the lamp of the present invention manufactured in this manner include a lamp voltage of 60 V and a luminous efficiency of 60 W at 160 W operation.
lm / W. This characteristic was equivalent to that of a high-pressure mercury lamp using a functionally graded material as a sealing body.

In this embodiment, the electricity introducing body is composed of a sealing body containing 15% by volume of a conductive component and inner / outer leads. Since the internal lead and the external lead are baked and tightened via the metal member, the conductivity can be ensured while reducing the distortion due to the difference in thermal expansion coefficient between the internal lead, the external lead, and the sealing body. Further, when using this electricity introducing body for a quartz lamp, the electricity introducing body has a coefficient of thermal expansion close to the coefficient of thermal expansion of quartz glass. It can be secured.

Next, a method of manufacturing the lamp shown in FIG. 5B will be described below. Here, as in the above, the conductive quartz sintered body is composed of an insulating component of 85 vol% and a conductive component of 15 vol.
% Of SiO ₂ and HfO ₂ as insulating components.
These were mixed at a ratio of 9: 1 in a ratio of 1 and W was used as a conductive component. Airtight part 5 made of conductive quartz sintered body
A sealed body having an outer diameter of 4 mm, an overall length 1 of the hermetic portion 52 of 0 mm, an outer diameter of the joining portion 51 made of sintered quartz glass of 6 mm, and an overall length of the joining portion 51 of 10 mm is used.

An electric lead for a lamp comprising a sealed body having a structure in which a sintered quartz glass is joined to a conductive quartz sintered body having a thermal expansion coefficient similar to that of the quartz glass, and internal and external leads. When making a lamp using body 4,
Arc tube 10 having sealing portion 22 and lamp 4
Is set on a glass lathe, and a non-oxidizing gas such as nitrogen is flowed from the arc tube 10 side to rotate both the arc tube 10 and the lamp electric introducer 4 while synchronizing while preventing oxidation of the electrode 15. While heating with an oxygen-hydrogen flame,
The quartz glass at the joint portion 51 of the arc tube 10 and the lamp electric introducing member 4 is melt-bonded. Bonding is similarly performed on the other electrode side. In this case, in many cases, a non-oxidizing gas flows from the sealing portion 22 to prevent oxidation of components such as electrodes.

After the sealing on both sides of the arc tube 10 is completed in this manner, the exhaust and the inclusion are introduced through the sealing portion 22. This time, Xe gas was introduced. In this case, a lamp input of 150 W, a lamp current of 8.5 A, a lamp voltage of 18 V,
A total luminous flux of 3000 lm / W was obtained.

In this embodiment, the electricity introducing member 4 is arranged to reach the hermetic portion 52 containing the conductive component of 15% by volume, the sintered quartz joint portion 51, and the hermetic portion 52. Conductivity is secured by the internal lead 13 and the external lead 14, and the internal lead 13 and the external lead 14 are welded to the airtight portion 52 via the metal member 16, so that the internal lead 13 and the external lead 14 are connected to the airtight portion. 5
Conductivity can be secured while alleviating distortion due to the difference in the coefficient of thermal expansion of (2). Further, when the electricity introducing body 4 is used for a quartz glass lamp, the electricity introducing body 4 has a coefficient of thermal expansion close to the coefficient of thermal expansion of quartz glass. The property can be sufficiently secured.

[0056]

According to the present invention, a conductive quartz sintered body having a coefficient of thermal expansion close to that of quartz glass can be used as an electricity introducing body of a lamp having an arc tube made of quartz glass. Of the present invention is reduced in comparison with conventional functionally graded materials. Since the conductive quartz sintered body has a coefficient of thermal expansion close to that of quartz glass, it is sealed with a quartz glass arc tube with good airtightness.
There is sufficient conduction due to the composition containing 15% by volume of the conductive component. Although there is a difference in the coefficient of thermal expansion between the inner lead or the outer lead and the sealed body made of the conductive quartz sintered body, the metal member is formed between the inner lead and the outer lead and the sealed body made of the conductive quartz sintered body. By intervening between them, cracking of the sealing body due to thermal expansion / contraction can be prevented.

The sealing body has a structure in which one end is made of a conductive quartz sintered body and the other end is made of sintered quartz glass. Also, since it was glass, it was easier than in the case of using only a conductive quartz sintered body having a thermal expansion coefficient close to that of quartz glass. Also in this case, since the conductive quartz sintered body has a coefficient of thermal expansion close to that of quartz glass, it is sealed with a quartz glass arc tube with good airtightness. %, There is sufficient conduction. Although there is a difference in the coefficient of thermal expansion between the inner lead or the outer lead and the sealed body made of the conductive quartz sintered body, the metal member is formed between the inner lead or the outer lead and the sealed body made of the conductive quartz sintered body. By intervening between them, cracking of the sealing body due to thermal expansion / contraction can be prevented.

Further, by using the sealed body made of the conductive quartz sintered body, when the quartz glass arc tube is manufactured by sintering, it has a thermal expansion coefficient close to that of quartz glass. Sintering can be performed to achieve airtightness.

Since W or Mo used as a conductive component is exposed on the outer surface of the sealed body, the outer surface is made of glass having a coefficient of thermal expansion similar to that of a conductive quartz sintered body. By forming the oxidation-resistant film, oxidation of the sealing body can be prevented even at a temperature at which oxidation of W or Mo becomes severe in an oxidizing atmosphere.

The portion facing the light emitting space is covered with quartz glass or glass containing quartz glass as a main component in order to prevent a reaction between the metal component of the conductive quartz sintered body and the enclosure, thereby providing a conductive material. The movement of particularly the metal component of the quartz sintered body to the light emission space can be prevented, and a stable light emission spectrum can be maintained for a long time.

[Brief description of the drawings]

FIG. 1 is a view showing a conventional lamp sealing structure using a sealing body made of a functionally graded material.

FIG. 2 is a view showing a lamp sealing structure of a conventional ceramic lamp using a cermet sealing body.

FIG. 3 is a view showing one embodiment of the structure of the electricity introducing body of the present invention.

FIG. 4 is a view showing another embodiment of the electricity introducing body structure of the present invention.

FIG. 5 is a diagram showing a lamp sealing structure using the electric introduction body of the present invention.

FIG. 6 is a table showing an example of a composition of a conductive quartz sintered body provided for the electricity introducing body of the present invention.

FIG. 7 is a table showing an example of the composition of a conductive quartz sintered body and a sintered quartz glass composite used for the electric conductor of the present invention.

DESCRIPTION OF SYMBOLS 1 Discharge lamp 2 Welding part 3 Lamp electric introducing body 4 Lamp electric introducing body 10 Light emitting tube 12 Sealing part 13 Internal lead 14 External lead 15 Electrode 16 Mo foil 17 Oxidation resistant film 20 Light emitting tube 22 Seal Stop 23 Internal lead 24 External lead 25 Electrode 26 Frit 30 Temporary molded body 31 Internal lead insertion hole 32 External lead insertion hole 50 Temporary molded body 51 Joint 52 Airtight part 53 Internal lead insertion hole 54 External lead insertion hole 55 Other end side of arc tube 60 Quartz tube for fixing 70 Sealed body

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[Procedure amendment]

[Submission date] August 18, 2000 (2008.1.
8)

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] Fig. 6

[Correction method] Change

[Correction contents]

FIG. 6

[Procedure amendment 2]

[Document name to be amended] Drawing

[Correction target item name] Fig. 7

[Correction method] Change

[Correction contents]

FIG. 7

Claims (6)

[Claims] 1. A lamp electric introducer for enclosing a sealing portion of a lamp having a quartz glass arc tube and for introducing a current into the arc tube, wherein the heat is smaller than quartz glass containing quartz glass as a main component. A substantially columnar conductive quartz sintered body sintered from an insulating material having an expansion coefficient and a conductive material having a thermal expansion coefficient larger than quartz glass is supplied with power from an internal lead having an electrode at the tip and the outside of the lamp. External leads are inserted into holes formed on both bottom surfaces of the sealing body, and the contact portions of the sealing body, the external leads, and the internal leads are fixed by sintering with a metal member interposed therebetween. An electricity introducing body for a lamp, characterized in that: 2. A lamp electrical introducer for sealing a sealing portion of a lamp having a quartz glass arc tube and introducing a current into the arc tube, wherein the heat is smaller than quartz glass mainly composed of quartz glass. A region consisting of a conductive quartz sintered body having a thermal expansion coefficient similar to that of quartz glass, sintered from an insulating material having an expansion coefficient and a conductive material having a thermal expansion coefficient larger than that of quartz glass; And a sealed body formed by joining the two so that one end is a region made of the conductive quartz sintered body and the other end is a region made of the sintered quartz glass. An inner lead having an inner lead and an outer lead for supplying power from outside the lamp are inserted into holes formed substantially at the centers of both bottom surfaces of the sealing body, and a contact portion between the sealing body, the outer lead, and the inner lead is formed of a metal member. Is fixed by sintering with An electric introduction body for a lamp, comprising: 3. The conductive quartz sintered body is a material having a composition in which at least one of TiO _2, ZrO _2, or HfO ₂ is added to quartz glass as an insulating material, and Mo or W is mainly used as a conductive material. 3. The lamp electrical introducer according to claim 1, wherein the material is a component. 4. A lamp characterized in that the lamp electric introduction body according to claim 1 and a quartz glass arc tube are joined by melting quartz glass of the arc tube. 5. An oxidation-resistant film having a coefficient of thermal expansion close to the coefficient of thermal expansion of the conductive quartz sintered body is formed on the conductive quartz sintered body in contact with an oxidizing atmosphere. 4
The lamp as described in. 6. The lamp according to claim 4, wherein the surface of the conductive quartz sintered body facing the light emitting space is covered with quartz glass or glass containing quartz glass as a main component.