JP2001102008A - Introducing conductor for airtight closure and the light bulb using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an introducing conductor for airtight closure which can prevent oxidation of the conductor as well as crack or leak of the closure parts due to a metal foil of the conductor, by forming an anti-oxidative film made of materials having inclination function on the surface of the metal foil, and to provide a light bulb using the same. SOLUTION: The introducing conductor 1A for airtight closure comprises a molybdenum film 1; and an anti-oxidative film 2 composed of molybdenum and silicon dioxide formed at the surface of the molybdenum film 1 such that the content amount of the molybdenum being higher at inside portion thereof. Also, there is provided a light bulb having a vessel 3 made of quartz glass and the introducing conductor 1A sealed in the vessel 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an introduction conductor such as a metal foil hermetically sealed with quartz glass and a bulb or a high-pressure discharge lamp in which the introduction conductor is hermetically sealed at the end of a quartz glass envelope. About the bulb.

[0002]

2. Description of the Related Art Light bulbs such as halogen lamps and tube-type infrared lamps, and high-pressure discharge lamps such as high-pressure mercury lamps and metal halide lamps use quartz glass in an envelope in consideration of heat resistance, pressure resistance and corrosion resistance. ing. The mounting structure of these bulbs uses a metal foil made of molybdenum Mo foil or the like as an introductory conductor located at a sealing portion to maintain airtightness with a quartz glass envelope.

[0003] Usually, the thickness of the molybdenum Mo foil is 20 to
When the thickness is more than 30 μm, if the thickness is more than 30 μm, cracks may occur in the sealing portion of the quartz glass envelope and the airtightness may not be maintained due to the coefficient of thermal expansion. In some cases, the sheet may be weakly bent to cause a positional shift, or the foil may be broken during sealing work or lighting.

The above-mentioned mounting structure is, for example, formed by welding or caulking an inner conductor made of molybdenum Mo or tungsten W to one end of a molybdenum Mo foil in the form of a ribbon, and an outer conductor made of molybdenum Mo to the other end. A coiled filament and a discharge electrode are provided at the tip of the internal conductor, and the external conductor is connected to a base, a terminal pin, or a power supply line after exhausting the inside of the envelope.

[0005] For example, in a halogen lamp, when a predetermined halogen cycle is caused, the surrounding container at the time of lighting is set to 250 ° C.
The temperature of the mounting structure such as the inner conductor, the molybdenum foil, and the outer conductor connected to the coil-shaped filament is designed to be the above temperature, and is about 350 to 400 ° C.

[0006] When the halogen bulb is turned on, the external lead wire extending from the sealing portion at the end of the envelope is in a high-temperature atmosphere that is exposed to the outside air in the base and the terminal pins. For this reason, although it is made of molybdenum, it is gradually oxidized, and this oxidation proceeds to the portion buried in the sealing portion, and finally reaches the molybdenum foil portion to which the external conductor is connected. The connection between the external conductor and the molybdenum foil must be kept at 350 ° C. or less during lighting to prevent oxidation. Note that, although the external conductor is made of, for example, molybdenum, the portion buried in the sealing portion is thicker than the foil, and thus does not strictly adhere to quartz glass.

[0007] When the molybdenum foil, which is an introduction conductor for hermetic sealing, is oxidized, the electric resistance of the light bulb increases, and furthermore, the temperature of this portion rises or stress is applied thereto.
Eventually, the foil was cut off, the electricity could not be supplied, or the sealing portion was broken, so that the airtightness of the container could not be maintained, resulting in a short life which did not reach the predetermined life.

Therefore, various means have been tried and implemented in order to prevent oxidation of the external conductor in the sealing portion. For example, it is known that a portion of an end face of a sealing portion from which an external conductor is led out is covered with frit glass.
However, this means not only requires time and effort to coat the frit glass, but in the case of low-melting glass, the molten glass may flow into the socket and cause poor conduction.

As another means, it is disclosed that a molybdenum foil itself is subjected to a treatment for preventing oxidation as disclosed in Japanese Patent Publication No. 2-267850. In other words, chromium, aluminum, silicon,
This is done by embedding a substance made of titanium, tantalum, palladium or the like. In this case, the oxidation is performed by preventing the dissolution of the foil surface, but the antioxidant layer is formed by a method that requires labor such as PECVD. Also, in the above publication,
It is disclosed that a molybdenum foil is coated with a thin film, but there is no specific description of a coating material, its film thickness, and the like.

The present inventor has previously filed an application for forming a film made of silicon oxide on the surface of the metal foil for preventing oxidation.

In the case where the coating made of silicon oxide is formed, the metal foil is prevented from being oxidized, so that the sealing portion can be prevented from leaking or cracking due to the metal foil. There is a strong demand for prevention of oxidation of the metal foil in the sealing portion, which is further heated to a higher temperature as miniaturization and higher efficiency are promoted.

Further, a functionally graded material comprising an electric conductor and an electric insulator has been proposed as a means for preventing oxidation of the introduced body.
No. 1-86794. The one disclosed in this publication is difficult to manufacture, and if sealing is performed under the same conditions as in the past, there are disadvantages such as the fact that the foil tends to break. When a rod-shaped functionally gradient material is used, a special sealing step is required.

[0013]

The inventor of the present invention pays attention to the fact that performing a treatment for preventing oxidation on the surface of the metal foil itself such as molybdenum has good workability and economical efficiency such as yield. As a result of various studies, the present invention has been completed.

That is, the present invention has been found to prevent oxidation of an introduced conductor such as a metal foil by forming a coating for preventing oxidation on a surface of the metal foil with a material having a tilting function. It is an object of the present invention to provide a hermetic sealing introduction conductor capable of preventing cracks and leaks in a sealing portion caused by the above, and a bulb using the sealing introduction conductor.

[0015]

According to a first aspect of the present invention, a lead for hermetic sealing according to the present invention comprises a molybdenum foil and a molybdenum foil having a high molybdenum content on the inner surface and an oxidized outer surface on the surface of the molybdenum foil. It is characterized by comprising an oxidation-resistant coating made of molybdenum and silicon oxide formed to have a high silicon content ratio.

The surface of the molybdenum foil is coated with an oxidation-resistant film made of a functionally gradient material of an electric conductor made of molybdenum and an electric insulator made of silicon oxide. The outermost side of this coating is 100% or 100% of the same quality as the surrounding container.
% Of the silicon oxide, and the coating gradually or continuously and gradually decreases in proportion to the molybdenum foil as the film approaches the molybdenum foil, and the molybdenum content (amount) decreases accordingly. The surface of the molybdenum foil, that is, the inner surface of the coating, is covered with a material having a gradient function consisting of molybdenum at a rate of 100% or close to 100% of the foil.

In the operation of forming the sealing portion, the molybdenum foil surface corresponds to a portion where the molybdenum ratio (amount) is rich, and the inner surface of the quartz glass corresponds to a portion where the silicon oxide ratio (amount) is rich. Therefore, the two are homogeneous and have good fusibility and are easy to conform to, and the airtightness is increased. In addition, since the composition in the middle portion of the oxidation-resistant coating gradually changes, the generation of stress can be suppressed. Then, for example, oxygen that has penetrated through the external conductor is blocked by the portion containing a large amount of silicon oxide formed on the surface of the molybdenum foil, and oxygen does not directly touch the molybdenum foil portion, which is the internal metal portion. In addition, the occurrence of oxidation of the molybdenum foil portion can be suppressed, and even if oxidation occurs, its progress can be delayed.

In the functionally graded material of the present invention, molybdenum is used as the electric conductor and silicon oxide is used as the electric insulator. The substance can be mixed a little. The lead-in conductor for hermetic sealing according to claim 2 of the present invention comprises a molybdenum foil, an external lead made of molybdenum connected to one end of the molybdenum foil, and an inner surface provided on the surface of the molybdenum foil and the external lead. It is characterized by having an oxidation-resistant coating made of molybdenum and silicon oxide formed such that the content ratio of molybdenum is high on the side and the content ratio of silicon oxide on the outer surface is high.

According to the first aspect of the present invention, an oxidation-resistant coating is formed on the lead conductor to which a molybdenum external conductor is connected to one end of the molybdenum foil in the same manner as in the first aspect. It has a similar effect.

According to a third aspect of the present invention, the introduction conductor for hermetic sealing is characterized in that the thickness of the oxidation-resistant film is 3 to 20 μm.

By setting the thickness of the oxidation resistant coating to 3 to 20 μm, the same effect as described in the first and second aspects can be obtained, and there is no problem in practical use. If the thickness is less than 3 μm, the coating is broken. It is not easy to form a film, and there is a possibility that cracks may occur in the sealing portion in addition to the effect of forming a film.
If it exceeds μm, there is a problem that hermetic sealing cannot be performed. Considering the variation in the thickness of the coating film, the thickness is preferably about 5 to 15 μm.

According to a fourth aspect of the present invention, there is provided the envelope according to any one of the first to third aspects, wherein the envelope is made of quartz glass and hermetically sealed at an end of the envelope. A hermetic sealing introduction conductor, an electrode assembly connected to the other end of the hermetic sealing introduction conductor and extending into the surrounding container, and the other end of the molybdenum foil of the hermetic sealing introduction conductor And an external conducting wire led out of the envelope.

In a tube in which an envelope made of quartz glass is used, the surface of the molybdenum foil is coated with an oxidation-resistant film made of silicon oxide of the same quality as the envelope, so that both are well fused and airtight. And the same effect as described in the first and second aspects is achieved.

Further, the tube to which the present invention is applied is not limited to the one in which the sealing portion is formed at one end of the envelope, and the sealing bulb is provided at both ends of the envelope. May be
The envelope may be a multiple tube such as a double tube. further,
The sealing portion is not limited to the crushing sealing portion, and may be a sealing portion formed by shrinking glass constituting the surrounding container.

According to a fifth aspect of the present invention, the bulb is characterized in that the electrode assembly is a light bulb having a coiled filament that emits light or a discharge lamp having a discharge electrode.

Light bulbs such as halogen light bulbs and tubular infrared light bulbs,
When applied to a discharge lamp such as a high-pressure mercury lamp or a metal halide lamp, the same effect as described in the fourth aspect is obtained.

The electrode structure represented by the present invention refers to a coiled filament in the case of a light bulb and a discharge electrode portion in the case of a discharge lamp.

A bulb according to a sixth aspect of the present invention is characterized in that the bulb or the discharge lamp has a reflecting mirror.

In a tube provided with the reflecting mirror integrally or separately, the same effect as described in the fourth and fifth aspects is exerted.

[0030]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a sealing lead and a bulb according to an embodiment of the present invention. FIG.
FIG. 1A is a plan view of a sealing molybdenum foil, FIG. 1B is an explanatory view in which a cross section is enlarged, and FIG. 2 is a partial sectional front view of a bulb using the molybdenum foil, for example, a halogen lamp L1. .

Reference numeral 1A denotes an introduction conductor for hermetic sealing with quartz glass, for example, a ribbon-like molybdenum (M) made of a thin plate having a width of about 2.5 mm, a length of about 7 mm, and a thickness of about 25 μm.
o) On the surface of the foil 1, an oxidation-resistant film 2 made of a mixture of molybdenum (Mo) and silicon oxide (SiO ₂ ) and having a thickness of about 5 μm is formed. In the oxidation-resistant coating 2, the content of molybdenum M is 100% or close to 100% on the surface side of the molybdenum foil 1, that is, the inner surface of the coating 2, and the content of silicon oxide S is 100% or 100% on the outer surface. Molybdenum (Mo) as an electric conductor and silicon oxide (SiO ₂ ) as an electric insulator formed by changing the ratio continuously or stepwise so as to have a ratio close to the above.
In the form of a functionally graded material comprising:

Then, the sealing introduction conductor 1A is sealed in the sealing portion of the halogen lamp L1. As shown in FIG. 1B, both side surfaces 11 of the molybdenum foil 1 are thinned by means of electrolytic polishing (etching) or the like in order to increase airtightness with quartz glass.

In FIG. 2, reference numeral 3 denotes an envelope (bulb) made of quartz glass, and 4 denotes a sealing portion formed by melting and crushing one end of the envelope 1. A sealing introduction conductor 1A made of sealing molybdenum foils 1, 1 is embedded and hermetically sealed with quartz glass. Further, the molybdenum foil 1 is welded to one end and the surrounding container 3
Inner conductors 5A, 5A extending inside to form an electrode assembly
However, the outer conductors 5B, 5B are provided to be welded to the other end of the molybdenum foil 1 and to be drawn out of the envelope 3. In addition, 31 is an exhaust pipe.

Reference numeral 6A denotes a filament obtained by winding a tungsten wire in a coil shape. The coiled filament 6A has both ends near the both ends connected to the tips of the internal conductors 5A, 5A by means such as welding or caulking. Both inner conductors 5
An intermediate portion is supported by an anchor 52 implanted in a bead 51 that supports A and 5A at predetermined intervals.

Further, a small amount of CH ₂ Br is contained in the envelope 3.
Halides and argon, such as ₂ or CH ₃ Br (A
A gas mixture of r) and nitrogen (N ₂ ) is sealed.
Reference numeral 7 denotes a base joined to the sealing portion 4 via a heat-resistant adhesive 71. The external conductors 5B, 5B are connected to the shell and top eyelet of the base 7 by means such as welding or brazing. Electrically connected.

Further, a visible light transmitting infrared reflecting film (hereinafter, referred to as a red film) is provided around the outer surface of the envelope 3.
35 are formed. The red anti-reflection film 35 is, for example, titanium oxide (Ti) for forming a high refractive index layer film on the glass surface of the container 3.
O ₂ ) and silicon oxide (SiO ₂ )
₂ ) are alternately repeated to form a multilayer optical interference film. When the lamp 7 is turned on with the base 7 attached to a socket (not shown), the surrounding container 3 is turned on.
The coiled filament 6A disposed therein generates heat and emits a large amount of infrared light together with the visible light, and most of the visible light of the light emitted from the filament 6A passes through the envelope 3 and the red film 35 and is scattered. 3 is emitted to the outside. The infrared light emitted from the filament 6A is reflected by the red film 3
5, the light is returned to the filament 6A (the emission of the infrared rays from the filament 6A and the reflection at the red film 35 are repeated). The filament 6A is reheated to increase the light emission, and as a result, the filament 6A The visible light emission from the light source increases, and the luminous efficiency can be improved.

The molybdenum foils 1 and 1 constituting the introduction conductor 1A embedded in the sealing portion 4 are hermetically sealed with quartz glass and completely shut off the ventilation inside and outside the envelope 3. I have. In the halogen lamp L1, the temperature of each part is further increased by the lighting, current flow, and the red anti-reflection film 35 formed on the outer container 3 to cause a halogen cycle. Oxidation proceeds to the molybdenum foil 1 at first.

However, the molybdenum foil 1 has a surface coated with an oxidation-resistant film 2, and the outermost surface of the film 2 is made of silicon oxide S of the same quality as the surrounding container 3. 1, the content ratio (amount) of silicon oxide gradually decreases, and the content ratio (amount) of molybdenum gradually increases accordingly. On the surface of the molybdenum foil 1, that is, on the inner side of the coating 2, the molybdenum foil 1 It is covered with molybdenum M of the same quality.

In the operation of forming the sealing portion 4, a portion where the molybdenum ratio (amount) is rich corresponds to the surface of the molybdenum foil 1, and a portion where the silicon oxide ratio (amount) is rich on the inner surface of the quartz glass. Since they correspond to each other, they are of the same quality and have good fusibility, so that the airtightness is improved and the composition in the middle part of the oxidation-resistant coating 2 gradually changes, so that the generation of stress can be suppressed. And, for example, oxygen that has penetrated through the external conductor 5B is
The oxidation-resistant coating 2 formed on the molybdenum foil 1 is blocked by the surface portion containing a large amount of silicon oxide, and the molybdenum foil is not oxidized directly without contact with oxygen. Generation can be suppressed, and even if oxidation occurs, its progress can be delayed.

Therefore, it is possible to provide a long-life bulb L1 which can reduce the occurrence of leaks and cracks in the sealing portion 4 of the envelope 3 constituting the halogen bulb L1.

According to the experiment of the inventor, the halogen lamp L
In the case where the temperature of the molybdenum foil 1 embedded in the sealing portion 4 reaches about 380 ° C. at the time of lighting, the time from oxidation to foil breakage and leakage of the sealing portion 4 is a conventional product (oxidation-resistant). In the case where the temperature reaches about 400 ° C. for about 2500 hours, the product of the present invention has about 10 hours.
000 hours, which is about 4 times longer.

In addition, since the heat resistance of the sealing portion 4 is improved, if the conditions of the sealing portion 4 are the same, a higher output (higher current) bulb can be used, for example, in a 12V class bulb. Although the upper limit of the electric power was about 75 W, it became possible to increase the electric power to about 150 W. This means that the light bulb (enclosed container) can be made smaller and more efficient at the same rating.

The oxidation of the molybdenum foil 1 was carried out by
It is considered that the surface of the metal foil 1 is buried with an antioxidant substance as described in the above-mentioned publication, because the surface of the metal foil 1 is caused by the fine cracks generated in the surface layer portion and the oxygen reaches the metal portion. More preferably, the antioxidant coating 2 is provided on the surface of the molybdenum foil 1.

The thickness of the oxidation-resistant film 2 formed on the molybdenum foil 1 is preferably about 3 to 20 μm.
When the thickness is less than μm, the coating 2 is easily broken by sealing work and the like, and not only is there no effect of forming the coating 2 but also cracks may occur in the sealing portion 4. There is a problem that sealing cannot be performed. Considering the variation in the thickness of the coating 2 and the like, the thickness is preferably about 5 to 15 μm.

In addition, molybdenum (M
o) and an oxidation-resistant film 2 composed of silicon oxide (SiO ₂ )
Can be formed by disposing a composite target composed of molybdenum (Mo) and silicon oxide (SiO ₂ ) on the same cathode, or by forming molybdenum (Mo) and silicon oxide (S
This can be performed by dual beam sputtering or the like in which a composite target composed of iO ₂ ) is placed on a plurality of cathodes.

FIG. 3 shows the mixing ratio of molybdenum (Mo) and silicon oxide (SiO ₂ ) in the thickness direction of the oxidation resistant film 2 formed on the molybdenum foil 1. The graph of FIG. 3 is a graph showing an example of the tendency in which the horizontal axis represents the film thickness direction and the vertical axis represents the mixing ratio. , A gentle curve with a lot of each substance was drawn, and in the middle part, a sharp change showed better fusion with the base material.

FIG. 4 is a perspective view showing another embodiment of the sealing introducing conductor of the present invention. In FIG. 4, the same parts as those in FIGS. Omitted.

In the sealing introduction conductor 1B shown in FIG. 4, the oxidation-resistant coating 2 is formed on the surface of the molybdenum foil 1 and the external conductor 5B connected to the molybdenum foil 1 by means such as welding in the same manner as described above. It was done. In addition, this external conductor 5
The oxidation-resistant coating 2 on the surface of B may be formed at least on the portion embedded in the glass.

After connecting the external conductor 5B to the molybdenum foil 1, the sealing introduction conductor 1B can be formed with the oxidation-resistant coating 2 by the dual beam sputtering or the like in the same manner as described above. The filament can be connected and sealed with the envelope 3 made of quartz glass to complete the bulb. Also in this case, it is possible to provide a long-life bulb in which the occurrence of leaks and cracks is reduced.

FIG. 5 is a front view showing another embodiment of the bulb of the present invention. In the drawing, the same portions as those in FIGS. 1 and 2 are denoted by the same reference numerals, and description thereof will be omitted.

FIG. 5 shows an arc tube L2 which is an inner tube of a high pressure discharge lamp (HID lamp) such as a metal halide lamp. The tubular surrounding container 3 is made of quartz glass, and crushed sealing portions 4 and 4 are formed at both ends of the container 3, respectively, and the inside thereof has, for example, the same molybdenum foils 1 and 1 as shown in the above embodiment. The conductor 1A is buried hermetically.

The molybdenum foil 1 has an inner conductor 5A on one end side, which is a tungsten electrode rod extending to the inner side of the outer container 3, and an outer side of the outer container 3 on the other end side. Are connected to each other by welding or the like. Further, a discharge electrode 6B in which a tungsten wire is wound is provided on the tip side of the internal conductor 5A. A halide and mercury are sealed in the envelope 3 of the arc tube L2, and the lamp is completed in this state or sealed in an outer tube made of hard glass or the like (not shown).

When the molybdenum foil 1 forming the introduction conductor 1A is sealed in the outer container 3 and when the lamp L is turned on, the discharge tube L2 also discharges and passes the temperature of the container 3 and other parts. Rises, and as a result, the oxidation of the external conductor 5B gradually progresses to the molybdenum foil 1 as well. However, since the molybdenum foil 1 has a surface coated with an oxidation-resistant film 2 having a gradient function of molybdenum and silicon oxide, the molybdenum foil 1 inside the molybdenum foil 1
Oxygen does not directly contact the portion, and the generation and progress of oxidation of the molybdenum foil 1 can be delayed.

Accordingly, it is possible to provide a long-life high-pressure discharge lamp capable of reducing the occurrence of leaks and cracks in the sealing portion 4 of the envelope 3 constituting the arc tube L2.

FIG. 6 is a partially sectional front view showing another embodiment of the bulb of the present invention. In the drawing, the same parts as those in FIGS. Omitted.

FIG. 6 shows a tube L3 with a reflecting mirror. In the drawing, reference numeral 8 denotes a reflecting mirror. On the inner surface of the reflecting mirror 8, a visible light comprising a total light reflecting film such as aluminum or chrome or a multilayer light interference film is provided. A reflecting film 81 such as a light reflecting infrared transmitting film is formed, and a halogen lamp L4 (having a different shape from the halogen lamp L1 shown in FIG. ) Or the arc tube L2 is made of a heat-resistant adhesive 8
3 and are integrally fixed. In the figure, 84, 84
Is a terminal pin connected to the external conductors 5B, 5B, and a base may be fixed to the base end portion 82 instead of the terminal pins 84, 84.

In the bulb L3 with such a reflecting mirror, the temperature of the sealing portion 4 becomes higher, but the sealing portion 4 of the bulb L4 (and the arc tube L2) is similar to the above-described embodiment. A long-life reflector-equipped light bulb L3 (or discharge lamp) that suppresses leakage and cracks caused by oxidation of the molybdenum foil 1
Can be provided.

FIG. 7 is a perspective view showing an embodiment of the lighting fixture 9. 7, reference numeral 91 denotes a base attached to a ceiling surface or the like; 92, a support pole; 93, a universal joint rotatably attached to the tip of the pole 92; and 94, an instrument provided with the universal joint. A main body 95 is a reflector provided in the front opening of the instrument main body. A socket (not shown) is provided at the reflector 95, and the socket (not shown) has a halogen shown in FIG. The lighting fixture 9 is configured by mounting the base 7 of the bulb L1.

When the bulb L1 is mounted on a socket (not shown) of the device 9, the shell portion of the base 7 is screwed into the screw-in type socket. The electrical connection and the support of the light bulb L1 are made by contacting the terminal at the back of the socket having elasticity such as coil or coil. And the filament 6A through the socket
The light bulb L1 is turned on by energizing the lamp to emit light.

Although the temperature of the halogen lamp L1 rises considerably due to lighting or current flow causing a halogen cycle, the oxidation of the molybdenum foil 1 does not occur or the progress of the oxidation can be delayed. Until the end of the life of the light bulb L1.
Therefore, it is possible to provide the lighting fixture 9 which has a long life and does not require much trouble such as tube replacement.

It is needless to say that a lighting circuit device such as a ballast is required when lighting the discharge lamp L2 shown in FIG. Further, a light control body such as a cover or a lens may be provided so as to cover the instrument body 94 or the front opening of the reflecting mirror 8 shown in FIG. 4 for light control.

The present invention is not limited to the above embodiment,
For example, the width, length, and thickness of the molybdenum foil as the sealing introduction conductor may be determined as appropriate according to the output of the bulb to be applied. Further, the shape of the surrounding container is not limited to the tubular shape, but may be an oval shape, an elliptical shape, a spherical shape, or a composite shape thereof as shown in FIG.

Further, the halogen lamp L1 of the above embodiment is used.
Although a visible light transmitting infrared reflecting film (red anti-reflection film) is formed on the outer surface of the envelope, the present invention may be applied to a light bulb or a discharge lamp without a red anti-reflection film.

[0064]

According to the first to third aspects of the present invention, it is possible to seal the introduction conductor with quartz glass in a highly airtight manner and to suppress the progress of oxidation of the introduction conductor to occur at the sealing portion. It is possible to provide a long-life introduced conductor that can reduce leaks and cracks. Further, the formation of the oxidation resistant film can be easily performed by sputtering or the like, and the productivity can be improved.

According to the fourth aspect of the present invention, it is possible to provide a long-life bulb capable of suppressing the occurrence of oxidation of the metal foil sealed in the airtight container made of quartz glass or delaying the progress of oxidation. Further, it is possible to provide a tube in which the size of the airtight container can be reduced or the output thereof can be increased.

According to the fifth aspect of the present invention, the same effects as described in the fourth aspect can be obtained by applying the present invention to an incandescent lamp such as a halogen lamp and a high-pressure discharge lamp such as a mercury lamp and a metal halide lamp.

According to the sixth aspect of the present invention, the same effect as described in the fourth aspect can be obtained by applying the present invention to a light bulb or a discharge lamp having a reflecting mirror.

[Brief description of the drawings]

FIG. 1 (a) is a plan view showing an embodiment of a sealing molybdenum foil according to the present invention, and FIG. 1 (b) is an explanatory diagram schematically showing an enlarged cross section.

FIG. 2 is a partial cross-sectional front view showing an embodiment of a bulb (halogen lamp) according to the present invention.

FIG. 3 shows molybdenum (Mo) and silicon oxide (Si) in the thickness direction of an oxidation resistant film formed on a molybdenum foil.
6 is a graph showing an example of a mixing ratio with O ₂ ).

FIG. 4 is a perspective view showing another embodiment of the sealing introduction conductor of the present invention.

FIG. 5 is a front view showing another embodiment of the bulb (high-pressure discharge lamp) according to the present invention.

FIG. 6 is a front view showing another embodiment of the tube (tube with a reflecting mirror) according to the present invention.

FIG. 7 is a perspective view showing an embodiment of a lighting fixture.

[Explanation of symbols]

 1A, 1B: Introduced conductor 1: Molybdenum foil 2: Oxidation-resistant coating 3: Surrounding container 4: Sealing part 5A: Electrode assembly (internal conductor) 5B: External conductor 6A: Coiled filament 6B: Discharge electrode 8: Reflection Mirror L1: tube (halogen bulb) L2: tube (high pressure discharge lamp) L3: tube (tube with reflector)

Claims (6)

[Claims] 1. Oxidation resistance comprising molybdenum foil and molybdenum foil formed on the surface of the molybdenum foil such that the inner surface has a higher content of molybdenum and the outer surface has a higher content of silicon oxide. And a sealing film. 2. A molybdenum foil; an external conductive wire made of molybdenum connected to one end of the molybdenum foil; and a surface of the molybdenum foil and the external conductive wire having a high content of molybdenum on the inner surface and oxidizing on the outer surface. An introduction-resistant conductor made of molybdenum and silicon oxide formed so as to have a high silicon content, and a hermetic sealing introduction conductor. 3. The hermetic sealing introduction conductor according to claim 1, wherein the oxidation-resistant film has a thickness of 3 to 20 μm. 4. An enclosure made of quartz glass; an introduction conductor for hermetic sealing according to any one of claims 1 to 3, which is hermetically sealed at an end of the enclosure; An electrode assembly connected to the other end of the shut-off introduction conductor and extending into the envelope; connected to the other end of the molybdenum foil of the hermetic sealing introduction conductor; And a derived external conductor. 5. The bulb according to claim 4, wherein the electrode assembly is a light bulb having a coiled filament that emits light or a discharge lamp having a discharge electrode. 6. The bulb according to claim 5, wherein the bulb or the discharge lamp comprises a reflector.