JP2006092946A - Tube bulb and sealing member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tube bulb, and a sealing member that can be used for it, of which sealing of an opening of an airtight vessel is sure and easy, a sealing member has a simple structure, and that is capable of being reduced in size. <P>SOLUTION: The tube bulb is provided with an airtight vessel 1 with an opening, a sealing member 2 made of a functionally gradient material of a multi-layer structure equipped with an insulation layer 2a comprising mainly of a material similar to the airtight vessel 1 and a conductive layer 2b jointed to the insulation layer 2a, and sealing the opening 1a of the airtight vessel 1 at the position of the insulation layer 2a, by forming a diffusion junction layer 2c in which the junction part of the conductive layer 2b and the insulation layer 2a are intermingled by diffusion of substances constituting the both layers, with the conductive layer 2b and the insulation layer 2a laminated coaxially, extended in the axial direction so that the insulation layer 2a is positioned at the outside and the conductive layer 2b at the center part, and a seal-packaging member 3 seal-packaged inside the airtight vessel 1, having power fed from outside the airtight vessel via the conductive layer 2b of the sealing member 2. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a tube sealed with a sealing member made of a functionally gradient material and a sealing member that can be used for the tube.

  For tube bulbs such as halogen bulbs and high-pressure discharge lamps, a foil sealing structure in which molybdenum foil is generally used as a sealing metal foil is generally used. However, an attempt has been made to use a functionally graded material instead of the sealed metal foil for reasons such as the limit of the allowable current value in the sealed metal foil (see, for example, Patent Document 1).

  The functionally graded material used in Patent Document 1 includes silica powder alone, and a plurality of mixed powders in which the mixing ratio of silica powder and molybdenum powder is changed, together with a binder, the content of silica in a cylindrical press die sequentially. In order to reduce, it is manufactured by pressing and sintering. Thus, the completed sealing member has one end face which is a conductive side end face, the other end face which is opposite is a non-conductive side end face, and the tungsten current introduction rod is a part on the conductive side. It is hermetically sealed to the sealing member and is welded to the lamp vessel at the non-conductive side portion. Therefore, a plurality of buffer layers whose thermal expansion coefficients are sequentially changed by changing the mixing ratio of the conductors are interposed between the non-conductive side end surfaces, that is, the insulating layer and the conductive layer, thereby adjacent to each other. The difference in the coefficient of thermal expansion between the layers is reduced so that cracks do not occur in the functionally gradient material.

Also, a mixing step of mixing the first and second materials having different physical properties, and discharging the first material from the mixture of the first and second materials, the first, The production of a composite material (gradient material) in which the existence ratio of the first and second materials is changed in a single layer by including as a process a discharge step that makes the existence ratio of the second material different. A method is also known (see Patent Document 2). According to the manufacturing method of Patent Document 2, it is possible to obtain the Mo-rich portion to the central portion in the axial direction, the gradient material became coaxial structure and a SiO ₂ rich portion on the outside of the Mo-rich portion It is stated. Further, it is also described that a sealing cap using the obtained inclined material having the coaxial structure is fitted into an opening provided at an end portion of the arc tube of the discharge lamp.
Japanese Patent Laid-Open No. 2001-210279 JP-A-10-219308

  However, the conventional functional gradient material has a plurality of layers in which the blending ratio is sequentially changed as shown in Patent Document 1 in order to reduce the difference in thermal expansion coefficient between adjacent layers and avoid the occurrence of cracks. It has been necessary to use a multilayer structure with a buffer layer interposed, or to adopt a structure in which the compounding ratio inside the single layer is continuously changed as shown in Patent Document 2. For this reason, there existed a problem that a sealing member became large or a manufacturing process was complicated and manufacturing cost raised.

  In addition, as shown in Patent Document 2, when the multilayer structure is formed in a coaxial relationship, the sealing member can be sealed at the part extending over the entire length in the axial direction, so that the tube can be easily sealed. is there. However, there is a problem that the outer diameter of the sealing member is increased in order to form an inclined structure having a coaxial relationship in a direction orthogonal to the tube axis. For this reason, it is difficult to apply this type of conventional sealing member to a small tube or a tube for which the sealing portion is desired to be small.

  It is an object of the present invention to provide a tube that can easily and reliably seal an opening of an airtight container, has a simple structure, and can be miniaturized, and a sealing member that can be used for the tube. Objective.

    A tube according to a first aspect of the present invention includes an airtight container having an opening; an insulating layer mainly composed of the same kind of material as that of the airtight container; and a conductive layer directly or indirectly joined to the insulating layer. It consists of a functionally graded material with a multilayer structure, and the conductive layer and the insulating layer are laminated in a coaxial relationship, and the insulating layer is arranged outside and the conductive layer is located on the center side, extending in the axial direction. And a sealing member in which the junction of each layer forms a diffusion junction layer mixed by diffusion of substances constituting both layers, and seals the opening of the hermetic container at the site of the insulating layer; And a sealing member that is sealed inside the container and that is fed from the outside of the hermetic container via the conductive layer of the sealing member.

  Next, the operation of the present invention will be described. That is, in the present invention, the tube sealing member is made of a functionally gradient material having a multilayer structure having at least an insulating insulating layer and a conductive layer. In the case where an intermediate layer is formed between the insulating insulating layer and the conductive layer, the intermediate layer may have a multilayer structure including two layers or three or more layers. The intermediate layer can be used to reduce the difference in coefficient of thermal expansion or improve the strength. However, if the intermediate layer is used, the diameter of the sealing member increases, so the intermediate layer is as thin as possible. Preferably, it is omitted. It consists of a functionally graded material having a multilayer structure in which an insulating layer and a conductive layer are joined directly or indirectly. Although the thermal expansion coefficients of the insulating layer and the conductive layer are clearly different, a diffusion bonding layer that is mixed by diffusion of substances constituting two layers adjacent to the bonding portion between each layer is formed. Overcoming the obvious difference in their coefficient of thermal expansion and joining firmly. Since the diffusion bonding layer is significantly thinner than each layer, the sealing member can be defined as a multilayer structure basically ignoring the diffusion bonding layer.

  In addition, the sealing member has a multilayer structure having an insulating layer and a conductive layer formed in a coaxial relationship in the axial direction, and the insulating layer is outside and the conductive layer is located on the center side. The sealing member can be sealed in an airtight container over almost the entire length.

  According to the invention according to claim 2, the sealing member is formed with a two-layer structure of the conductive layer located on the center side and the insulating layer located on the outside, while ensuring the required sealing portion length. The axial dimension of the stop member can be shortened. Further, since a two-layer structure is also possible, the diameter of the entire sealing member can be reduced while keeping the diameter of the conductive layer to a required size. When the diameter of the sealing member is small, it is effective for reducing the opening of the tube. The fact that the opening of the tube is small has many advantages because its light distribution characteristics and appearance become good and sealing becomes easy.

  Therefore, according to the present invention described above, the sealing member can be miniaturized. Therefore, the material cost is also low.

  Further, a lead member as a power supply member is inserted into the conductive layer of the sealing member from the outside of the tube, or the tube sealing member is supported and electrically connected inside the tube. A tube sealing member, for example, an electrode if the tube is a discharge lamp, or a base end of an incandescent filament if it is an incandescent bulb, or directly supporting these tube sealing members. It is common to insert an intermediate member for this purpose. According to the present invention, since the sealing member has a multilayer structure of an insulating layer and a conductive layer, a two-layer structure is also possible. Therefore, as described above, the diameter of the conductive layer is set to the given outer diameter. Since it can be made as large as possible, it becomes easy to form the insertion hole for the insertion member, and as a result, it is possible to prevent the occurrence of cracks associated with the formation of the insertion hole of the sealing member.

  In order to seal the opening of the hermetic container using the sealing member, it is only necessary to fit the sealing member in the opening and fix them in an airtight manner. If the insulating layer is mainly composed of silicon oxide, both may be directly heat-treated and welded. In the case where the insulating layer is mainly made of aluminum oxide, heat treatment may be performed by sandwiching the sealing compound therebetween, and the sealing compound may be heated and melted to be solidified. Since the insulating layer portion is formed over almost the entire length of the sealing member, a desired sealing length can be obtained, sealing work is easy, and sealing is ensured. Further, since the opening of the hermetic container can be prevented from being accidentally joined to the conductive layer portion during sealing, cracks do not occur during sealing.

  Power can be supplied to the tube sealing member sealed inside the airtight container from the outside of the tube via the conductive layer. For example, as described above, the lead member is inserted from the outer end surface of the conductive layer, or only the conductive layer is protruded to one end side of the sealing member, and the power supply body is wound around the protruding portion, or the cap-shaped It can be held by a power supply member.

  According to the present invention, as described above, since the sealing member is mainly composed of the functionally gradient material having the two-layer structure, the structure of the sealing member is simple, the manufacturing process can be simplified, and the inexpensive pipe You can get a sphere.

  In the present invention and each of the following inventions, the tube is an electric actuating means in which a sealing member is hermetically sealed inside an airtight container. According to the present invention, a tube suitable for various uses can be obtained. For example, in the case of a lighting tube, this includes a halogen bulb, a high-pressure discharge lamp, and the like. In addition, for example, various electron tubes are included in the case of a non-illuminating tube.

The airtight container has an opening. When the sealing member is stored in the airtight container, the opening can be passed through. Further, the opening is sealed with a sealing member, so that the inside of the airtight container becomes airtight. Further, in the case of a lighting tube, the hermetic container can be configured to be translucent mainly with metal oxide or metal nitride. As the metal oxide, for example, silica (SiO ₂ ), alumina (Al ₂ O ₃ ), yttrium oxide (YOX), yttrium-aluminum-garnet (YAG), or the like can be used. As the metal nitride, aluminum nitride (AlN) or the like can be used. Each of the above substances is a material having translucency and heat resistance, and can be obtained as a polycrystalline body, that is, a ceramic or a single crystal. In the case of a non-illuminating tube, the hermetic container may be either translucent or non-translucent.

  The insulating layer of the sealing member is mainly composed of the same material as the material of the hermetic container. Similarly, since it is mainly composed of metal oxide or metal nitride, the thermal expansion coefficient is almost the same as that of the hermetic container. On the other hand, the conductive layer has conductivity enough to function as a conductor, and the coefficient of thermal expansion is relatively different from that of the insulating layer. In addition, the conductive layer is allowed to be composed of a mixture of a metal oxide or metal nitride and a conductive metal, which is preferably the same material as that constituting the insulating layer. In this case, it has been confirmed by experiments that the conductive metal exhibits the required conductivity if it is mixed by about 30% by mass or more of the conductive layer. However, if necessary, the conductive layer may be substantially composed only of a conductive metal.

  The sealing member is a member that is housed in the hermetic container and is supplied with electric power from the outside of the hermetic container through the conductive layer of the sealing member, and performs a desired electrical operation in the hermetic container. For example, in the case of a halogen bulb, the sealing member is an incandescent filament. In the case of a high pressure discharge lamp, the sealing member is a discharge electrode.

  The sealing member has a multilayer structure, for example, a two-layer structure, in which the conductive layer is located at the center of the shaft, and the insulating layer is coaxially disposed around the conductive layer. However, when the insulating layer and the conductive layer are formed by sintering, a relatively thin diffusion bonding layer is formed between these layers. This diffusion bonding layer is a layer in which a part of the material constituting both layers moves by diffusion and reaches the other layer at the joining portion of the insulating layer and the conductive layer, and the material constituting both layers is mixed. Forming. The diffusion bonding layer allows the wall thickness to be generally within the range of 0.1 to 10 mm, preferably 0.5 to 5 mm, and most preferably 1 to 3 mm. However, it is a relatively thin layer with respect to the thickness of the insulating layer and the conductive layer. Thus, the thickness of the diffusion bonding layer can be visually confirmed.

  Furthermore, the sealing member used in the present invention can be formed by a sintering method, for example, a rapid sintering method, in which the grain boundary of the raw material powder can be controlled by melting. Of the rapid sintering methods, the discharge plasma sintering method is preferred.

    According to a second aspect of the present invention, there is provided the tube according to the first aspect, wherein the sealing member is formed in a two-layer structure of a conductive layer located on the center side and an insulating layer located on the outer side. It is characterized by that.

  The present invention defines a particularly preferred two-layer structure among the multilayer structures.

    The tube of the invention according to claim 3 is the tube according to claim 1 or 2, wherein one end face of the conductive layer of the sealing member is exposed inside the hermetic container, and the other end face of the hermetic container. It is characterized by being exposed to the outside.

  The present invention defines a preferred configuration in the invention according to claim 1. That is, since both end surfaces of the conductive layer of the sealing member are exposed at the end surface of the sealing member, the electrical connection between the conductive layer and the sealing member of the conductive layer is inside the airtight container of the tube. In this case, when conducting the conductive layer to the power supply member, various aspects can be appropriately selected and adopted as desired. For example, the base end of the sealing member or the intermediate member for supporting the sealing member is welded to the end face exposed in the hermetic container of the conductive layer, pressed, or inserted into the insertion hole formed from the end face of the conductive layer toward the inside thereof. Can be inserted. Similarly, welding, pressure welding, insertion, and the like of the power supply member can be selectively employed on the end surface of the conductive layer exposed to the outside of the hermetic container.

  Further, the end surface of the conductive layer of the sealing member may be substantially flush with the end surface of the insulating layer, may protrude from the end surface of the insulating layer, or may be recessed. When protruding, for example, the protruding portion of the conductive layer can be held by the power supply member.

  Furthermore, when the insertion hole for inserting the sealing member or the power feeding member is formed on the end face of the conductive layer, the end face is exposed, so that the depth of the insertion hole can be easily and accurately set.

  Thus, in the present invention, since the end face of the conductive layer is exposed inside and outside the hermetic container, various aspects are adopted as described above when connecting the sealing member or the power feeding member to the conductive layer. Allow.

    The sealing member of the invention according to claim 4 is composed of a functionally graded material having a multilayer structure including an insulating layer and a conductive layer directly or indirectly joined to the insulating layer, and the conductive layer and the insulating layer are coaxially related. In addition, the insulating layer is arranged outside and the conductive layer is positioned on the center side and extends in the axial direction, and the joints of each layer are mixed by diffusion. A diffusion bonding layer is formed.

  The present invention defines the configuration of a sealing member that can be used for the tube of the invention according to claim 1. Further, the sealing member of the present invention is allowed to have the configuration described in the inventions according to claims 1 to 3. However, the sealing member is allowed to be used for sealing members other than the tube.

  Thus, in the present invention, the sealing member has a simple structure and can be miniaturized, and the sealing of the opening of the hermetic container is easy and reliable.

    The sealing member of the invention according to claim 5 is the sealing member according to claim 4, wherein the insulating layer is mainly composed of silicon oxide or aluminum oxide; the conductive layer is made of the same material as the material of the insulating layer. A refractory conductive metal material mixed in a proportion of mass% or more;

  In the present invention, the conductive layer stipulates that the same material as that of the insulating layer is used, but this means that not only the same material but also the same material should be used as a main component.

  When the insulating layer is mainly composed of silicon oxide, it is suitable for sealing an airtight container made of quartz glass or other glass. Further, when aluminum oxide is mainly used, it is suitable for sealing an airtight container made of translucent alumina ceramics.

  When the hermetic container is made of quartz glass, for example, molybdenum (Mo) or tungsten (W) can be used alone or mixed at an appropriate ratio. Further, niobium (Nb) or tantalum (Ta) can be used when used in a non-oxidizing atmosphere and the hermetic container is made of translucent alumina ceramics.

  Thus, in the present invention, a suitable sealing member can be obtained when the hermetic container is made of quartz glass or the like or translucent alumina ceramics.

    A sealing member according to a sixth aspect of the present invention is the sealing member according to the fourth or fifth aspect, wherein the sealing member is formed by sintering by a discharge plasma sintering method.

  The present invention defines the configuration of a highly reliable sealing member manufactured by a suitable manufacturing method. That is, by sealing the sealing member by the discharge plasma method, a good diffusion bonding layer is formed, and the insulating layer and the conductive layer are directly strong and securely and reliably bonded. Can be obtained. The discharge plasma method is a method in which sintering is performed by the heat generated by plasma of spark discharge generated in the particle gap and the Joule heat generated by energization when a DC pulse voltage is applied to the particle gap of the powder in the compressed state.

  According to the discharge plasma method, vaporization and melting occur on the surface of the compressed powder particles, and the powder particles are densely welded to obtain a homogeneous sintered body in which the insulating layer and the conductive layer are joined together. Can do. In the process of sintering the insulating layer and the conductive layer, part of the material constituting both layers moves at the junction between the insulating layer and the conductive layer by diffusion to reach the other layer, And since the diffusion bonding layer in which the substances constituting both layers are intertwined in three dimensions is formed, it is strong despite the difference in thermal expansion coefficient between the insulating layer and the conductive layer. Moreover, highly reliable bonding can be obtained over a long period of time.

    According to the first aspect of the present invention, it is possible to provide a tube that can easily and reliably seal the opening of the hermetic container and that has a simple structure and a small sealing member.

    According to the invention of claim 2, a tube provided with a sealing member having a two-layer structure of an insulating layer and a conductive layer can be provided.

    According to the invention of claim 3, the end face of the conductive layer is exposed inside and outside the hermetic container, so that a tube that allows adoption of various modes when connecting the sealing member or the power feeding member to the conductive layer is provided. Can be provided.

    According to the invention of claim 4, it is possible to provide a sealing member that is simple in structure and can be miniaturized, and that can easily and reliably seal the opening of the hermetic container.

    According to the invention of claim 5, it is possible to provide a sealing member sealing member suitable for the case where the airtight container is made of quartz glass or the like or translucent alumina ceramics.

    According to invention of Claim 6, it can manufacture with the suitable manufacturing method and can provide the reliable sealing member.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

    1 to 3 show one embodiment for implementing the tube and the sealing member of the present invention, FIG. 1 is a front sectional view of the tube, FIG. 2 is a front sectional view of an airtight container before sealing, FIG. 3 is an enlarged cross-sectional view of the sealing member. This embodiment is an example in which the present invention is applied to a high-pressure discharge lamp, wherein 1 is an airtight container, 2 is a sealing member, 3 is a sealing member, and 4 is a power supply member, which constitute a high-pressure discharge lamp, that is, a tube. is doing.

  The airtight container 1 is made of a light-transmitting and fire-resistant material such as quartz glass or light-transmitting alumina ceramics, and has an appropriate shape and an opening 1a, which will be described later. The sealing member 3 is stored in an airtight manner. In this embodiment, the hermetic container 1 is made of quartz glass having a substantially spindle shape, and a pair of openings 1a and 1a are formed at both ends in the tube axis direction as shown in FIG. Further, the airtight container 1 has a discharge space 1b having a substantially spheroid shape formed therein.

  The sealing member 2 is made of a functionally gradient material. As shown in an enlarged view in FIG. 2, this functionally graded material includes an insulating layer 2a and a conductive layer 2b, and basically has a multilayer structure in which the layers 2a and 2b are joined by a diffusion joining layer 2c, preferably Consists of a two-layered sintered body. As will be described later, this multilayer structure sintered body is formed by a discharge plasma sintering method belonging to the rapid sintering method as a sintering method capable of melting and controlling the grain boundaries of the raw material powder. The diffusion bonding layer 2a3 is formed by three-dimensionally intertwining the materials constituting the insulating layer 2a and the conductive layer 2a2 by diffusing and moving with each other.

  Further, the sealing member 2 is hermetically sealed by fitting and sealing in the opening 1 a of the hermetic container 1. In FIG. 1, an initial boundary between the opening 1a and the sealing member 2 is indicated by a dotted line.

The insulating layer 2a of the sealing member 2 is mainly composed of metal oxide or metal nitride, but in this embodiment, the hermetic container 1 is made of quartz glass, so that it is mainly composed of silica (SiO ₂ ). Yes. In contrast, the conductive layer 2b is mainly composed of a mixture of a conductive metal and a metal oxide, but in this embodiment, the conductive metal is made of molybdenum (Mo) or tungsten (W), and the metal oxide is oxidized. The material is made of silica which is the same material as the constituent material of the insulating layer 2a. The mixing ratio of the conductive metal and the metal oxide is selected at a predetermined ratio within the range of 30% by mass or more so that the conductive layer 2b has a conductivity that exhibits a required low resistance value. ing.

  Furthermore, the sealing member 2 has a coaxial relationship between the insulating layer 2a and the conductive layer 2b. That is, the conductive layer 2b is positioned in the center side, for example, around the central axis, and the conductive layer 2b is formed in a columnar shape, and the insulating layer 2a is surrounded in a cylindrical shape on the outer side, for example, around it. . For this reason, the insulating layer 2 a is coaxially formed with the conductive layer 2 b over the entire axial length of the sealing member 2. In addition, the conductive layer 2 b is exposed on both end surfaces of the sealing member 2 in the axial direction.

  The sealing member 3 is a discharge electrode made of a rod-shaped body made of tungsten (W), and its base end is inserted and fixedly supported from one end surface of the conductive layer 2b in the sealing member 2, and is supported. It is electrically connected to the conductive layer 2b.

  The power supply member 4 is a lead member made of a molybdenum rod-shaped body, and the tip thereof is inserted and fixedly supported from the other end face of the conductive layer 2b of the sealing member 2 and is supported by the conductive layer 2b. Conducted.

  Therefore, the sealing member 2, the sealing member 3, and the power supply member 4 described above constitute an electrode mount by being integrated with the sealing member 2 as the center.

  Thus, the tube constitutes a high-pressure discharge lamp, and the discharge electrodes of the pair of sealing members 3 and 3 are opposed to each other in the discharge space 1b in the light-transmitting hermetic vessel 1, and the discharge space. A discharge medium is enclosed in 1b.

  Next, in order to manufacture the sealing member 2 constituting the electrode mount, first, a compression molded body that is a starting material of the conductive layer 2b having a columnar shape is prepared. The sealing member 3 and the power supply member 4 are inserted into the conductive layer 2b up to a predetermined position in the compression molding step of the conductive layer 2b. Further, the compression-molded conductive layer 2b is placed at a predetermined position in the molding die, the material of the insulating layer 2a1 is put around the cylindrical portion, and compression-molded together with the conductive layer 2b. Sintering is performed using a discharge plasma sintering method.

  More specifically, in the manufacture by the discharge plasma sintering method, the powder for constituting the insulating layer 2a and the powder for constituting the conductive layer 2b are arranged coaxially in the sintering mold as described above. After that, a pair of electrodes are arranged at both ends of both powders, and a DC pulse voltage is applied between the pair of electrodes while pressing the powder. The atmosphere is preferably argon (Ar) of about several tens of MPa or a vacuum, but may be an air atmosphere if desired. By continuing the heating / pressurizing treatment for a predetermined time, the powder is sintered to obtain a sealing member having a coaxial two-layer structure. Thus, in the obtained sealing member 2, the diffusion bonding layer 2c is formed between the insulating layer 2a and the conductive layer 2b, and the insulating layer 21 and the conductive layer 2b are firmly formed by the diffusion bonding layer 2c. Are firmly integrated with each other. Further, the insulating layer 21 and the conductive layer 2b are each a dense sintered body.

  Further, the sealing member 3 and the power feeding member 4 are firmly fixed to the conductive layer 2b by co-fastening by sintering, and are electrically connected with very small contact resistance.

  Thus, the sealing member 2 hermetically seals the hermetic container 1 by sealing it to the opening 1a of the hermetic container 1 at the portion of the insulating layer 2a formed over almost the entire length in the axial direction. Yes. Therefore, since the airtight container 1 and the insulating layer 2a1 of the sealing member 2 are made of the same material, good sealing can be obtained. According to this embodiment, the sealing member 3 having a two-layer structure has been described, but it goes without saying that an intermediate layer may be used as needed as long as the diameter is not limited.

  A halogen bulb sealed using the sealing member according to the present invention having the following configuration was manufactured.

Insulating layer: SiO ₂ particles 100 (mass%)
Conductive layer: SiO ₂ particles 70-Mo particles 30 (mass%)
Manufacturing method: Plasma sintering

[Comparative Example] A high-pressure discharge lamp sealed with a sealing member having a multilayer structure in the axial direction according to the following configuration was manufactured.

Insulating layer: SiO ₂ particles 100 (mass%)
Buffer layer: first layer SiO ₂
95-Mo5, second layer SiO ₂ 80-Mo20, third layer SiO ₂ 70-Mo30,
4th layer SiO ₂ 60-Mo40 (both materials are particles, ratio is mass%)
Conductive layer: SiO ₂ particles 50-Mo particles 50 (mass%)
Manufacturing method: Normal heat sintering method

Vibration test conditions: The vibration test at 20 to 60 to 20 Hz (6 minutes in total) was conducted 6 times in the light-off state.

  Vibration test results: No cracks occurred in the examples.

                In the comparative example, interlayer cracks occurred.

  As another example, a high-pressure discharge lamp shown in FIG. 1 having the same sealing structure as that of the above example was manufactured and a similar test was performed. The same good results as in the above example were obtained. It was.

Front sectional view of a tube showing an embodiment for carrying out the tube and the sealing member of the present invention Front sectional view of the airtight container before sealing Similarly, an enlarged sectional view of the sealing member

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Airtight container, 1a ... Opening part, 1b ... Discharge space, 2 ... Sealing member, 2a ... Insulating layer, 2c ... Diffusion joining layer, 3 ... Sealing member, 4 ... Feeding member

Claims (6)

An airtight container with an opening;
It consists of a functionally graded material with a multilayer structure that has an insulating layer mainly composed of the same material as the hermetic container and a conductive layer directly or indirectly joined to this insulating layer, and the conductive layer and the insulating layer are laminated in a coaxial relationship. In addition, the insulating layer is arranged outside and the conductive layer is positioned on the center side and extends in the axial direction, and the joint portion of each layer is mixed due to diffusion of materials constituting both layers A sealing member that forms a bonding layer and seals the opening of the hermetic container at a portion of the insulating layer;
A sealing member sealed inside the hermetic container and fed from the outside of the hermetic container via the conductive layer of the sealing member;
A tube characterized by comprising: The tube according to claim 1, wherein the sealing member is formed of a two-layer structure of a conductive layer located on the center side and an insulating layer located on the outside. 3. The tube according to claim 1, wherein one end face of the conductive layer of the sealing member is exposed to the inside of the hermetic container, and the other end face is exposed to the outside of the hermetic container. It consists of a functionally graded material with a multilayer structure that includes an insulating layer and a conductive layer bonded directly or indirectly to the insulating layer. The conductive layer and the insulating layer are laminated in a coaxial relationship, and the insulating layer is electrically conductive on the outside. The layers are arranged so as to be positioned on the center side and extend in the axial direction, and the junction of each layer forms a diffusion junction layer mixed by diffusion of substances constituting both layers A sealing member. The insulating layer is mainly composed of silicon oxide or aluminum oxide;
The conductive layer includes a refractory conductive metal material mixed with a material similar to the material of the insulating layer in a proportion of 30% by mass or more;
The sealing member according to claim 4. 6. The sealing member according to claim 4, wherein the sealing member is formed by sintering by a discharge plasma sintering method.

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