JP3670994B2 - Discharge lamp - Google Patents

Description

【００３９】
表１により、本発明による、凹陥部５ａを有するベース部材５を用いたサンプルは、問題なく点灯５００時間を終了した（実施例１〜５）。また、当接部５ｆが施されたベース部材５を用いたサンプルも、問題なく点灯５００時間を終了した（実施例６〜１０）。これに対しして、凹陥部５ａあるいは平面状の当接部５ｆが無いサンプルは、封着後に何らかの不具合が生じた（比較例１〜３）。この内、２本は点灯５００時間に満たない内に消灯してしまった（比較例１、２）。
【００４０】
なお、放電灯としてショートアーク型放電灯を例にあげて説明したが、ロングアーク型放電灯、コンパクトアーク型放電灯、メタルハライド型放電灯等の同様の電極マウント部の構成を備えるものであれば、特に限定されるものではない。
【００４１】
【発明の効果】
以上の通り、本発明においては、マウント部を構成するベース部材の後端部外周上に、シール用金属箔の枚数以上の凹陥部または当接部を有し、これら凹陥部または当接部に集電部材の一部を配置することによって、凹陥部または当接部が集電部材のベース部材外周上でのずれを抑制し、ベース部材と集電部材を直接固定できるため、集電部材に接続されたシール用金属箔もベース部材に直接固定され、回転を伴う封着工程において、シール用金属箔がベース部材の外周上でずれない。その結果、シール用金属箔の切れ、ヨレおよび重なりが発生することがない。
また、製造中にシール用金属箔に不具合が生じない為に、歩留まりが大幅に向上する。さらに、シール用金属箔の切れ、ヨレおよび重なりが発生しない為に、マウント部は封止管としっかり封着でき、破裂やリークによる立ち消えを抑制することができる。さらに、外観が良くなり商品価値を上げることができる。
また、シール用金属箔の枚数以上の凹陥部または平面状の当接部を有することにより、シール用金属箔の配置の自由度が増し、各放電灯の用途に対応した設計が可能になる。たとえば、大電流を要する放電灯については、シール用金属箔の配置間隔を均等にすることができるため、封止部の熱歪み、またこれに起因するクラック、破裂等を抑制することができる。
【図面の簡単な説明】
【図１】本発明の放電灯における電極マウント部の斜視図を示す。
【図２】図１の電極マウント部の断面図を示す。
【図３】本発明の放電灯における凹陥部を有するベース部材の（ａ）正面図、（ｂ）斜視図を示す。
【図４】本発明の放電灯における他の凹陥部を有するベース部材の（ａ）正面図、（ｂ）斜視図を示す。
【図５】本発明の放電灯における他の凹陥部を有するベース部材の（ａ）正面図、（ｂ）斜視図を示す。
【図６】図５の凹陥部に平面部を設けたベース部材の正面図を示す。
【図７】本発明の放電灯における平面状の当接部を有するベース部材の（ａ）正面図、（ｂ）斜視図を示す。
【図８】多角形の凹陥部を端面に有するベース部材と金属成型体の（ａ）組合せ前、（ｂ）組合せ後の斜視図を示す。
【図９】本発明の放電灯における（ａ）棒状形状（ｂ）板状形状の集電部材の斜視図を示す。
【図１０】図９の集電部材の別形状の斜視図を示す。
【図１１】従来の放電灯の断面図を示す。
【図１２】従来の他の放電灯における電極マウント部の斜視図を示す。
【図１３】図１２の電極マウント部の断面図を示す。
【符号の説明】
１ 発光管
３ 電極
４ ビーズ管
５ ベース部材
５ａ、５ｂ、５ｃ、５ｄ、５ｇ 凹陥部
５ｅ 平面部
５ｆ 当接部
８ リード棒
１０ マウント部
１１ 封止管
１２ シール用金属箔
７１ 給電用リード線
８０、８０ａ、８０ｂ、８０ｃ 集電部材
８３ 金属成型体[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a discharge lamp used in the optical industry field, the semiconductor device manufacturing field, and the like, and more particularly to a discharge lamp having a foil seal structure and a characteristic of an electrode mount portion.
[0002]
[Prior art]
Generally, a discharge lamp typified by a short arc type discharge lamp is widely used in a field in which ultraviolet rays are radiated to a work, for example, in a field of manufacturing semiconductor devices. And what has various structures about the electrode mount part of a discharge lamp is proposed.
[0003]
As shown in FIG. 11, the structure of the mounting portion 110 of the electrode 103 in the conventional discharge lamp is such that a lead bar 108 having the electrode 103 at its tip is inserted into a bead tube 104 made of quartz glass and vacuum-tightly sealed. The current collecting disk 109A and the sealing metal foil 112 are electrically connected to each other at the front end face of the quartz glass base member 105 constituting the portion. The rear end surface of the base member 105 is electrically connected to the external lead rod 107 and the power supply lead wire 171 via the current collector plate 109B, and the base 106 is provided on the power supply lead wire 171. Note that the other electrode 102 has the same configuration as that of the electrode 103.
[0004]
As another example, there is a mount portion 210 of the electrode 203 as shown in FIGS. The mount portion 210 has a lead rod 208 having the electrode 203 at the tip thereof inserted into a quartz glass bead tube 204 and is attached to the front end surface of a quartz glass base member 205 constituting a vacuum hermetic sealing portion. It is electrically connected to the current collecting disk 209A and the metal foil 212 for sealing. A plurality of current collecting members 280 are connected to the rear end portion of the metal foil 212 for sealing, and the current collecting members 280 are bundled at the rear end surface side (end of the mount portion) of the base member 205 and fed to the power supply lead. It is connected to the line 271.
[0005]
And in the prior art example of FIG. 11, sealing of the mount part 110 to the inside of the sealing pipe | tube 111 is normally performed in the procedure shown below.
(1) The mount 110 is inserted into the inside of the sealing tube 111 with the end sealed.
(2) The inside of the arc tube 101 and the sealing tube 111 is set to a negative pressure.
(3) The sealing tube 111 is rotated about the arc tube axis.
(4) A burner is blown from the outside of the sealing tube 111, the position of the mount 110 is adjusted while the diameter of the blown region is reduced, and the mounting portion 110 is sealed in the sealing tube 111.
[0006]
[Problems to be solved by the invention]
However, the above-described discharge lamp has the following problems. In the case of the above-described procedure for sealing at the mounting portion of the conventional discharge lamp, the sealing metal foil 112 is only connected to the current collecting disk 109A and the current collecting plate 109B, and is fixed to the base member 105 made of quartz glass. Therefore, it is easily displaced on the outer periphery of the base member 105 due to the rotation at the time of sealing. Therefore, there has been a problem that the metal foil 112 for sealing is twisted and overlapped.
[0007]
Further, in sealing the mount portion 110 of the electrode 102 having a small volume (light weight), the twist and overlap of the metal foil 112 for sealing rarely occur, but the electrode 103 having a large volume (heavy weight) is not provided. In the sealing of the mount part 110, the mount part 110 is greatly shaken by the rotation at the time of sealing, so that the twist and overlap of the metal foil 112 for sealing are remarkably generated. Then, the twist and overlap of the metal foil 112 are melted by heat due to the generation of electric resistance, and cause disappearance. Further, due to the twist and overlap, the sealing tube 111 is cracked, the appearance is deteriorated, and the commercial value is lowered. Further, since the overlap of the sealing metal foil 112 deteriorates the airtightness inside the arc tube 101, a leak occurs in the sealing tube 111 or the expansion of the overlapping portion of the sealing metal foil 112 causes the sealing tube 111 to expand. It may cause cracks and ruptures.
[0008]
12 and 13, similarly to the example of FIG. 11, a burner is blown from the outside of the sealing tube 211 to reduce the diameter of the covered region, and the mounting portion 210 is sealed with the sealing tube 211. Sealed on the inner surface, the airtightness in the arc tube 201 is maintained. The metal foil for sealing 212 is disposed along the base member 205 made of quartz glass, but the metal foil for sealing 212 is only fixed by the current collecting disk 209A, and the base member made of quartz glass. Since it is not fixed to 205, it is easily displaced on the outer periphery of the base member 205 due to rotation at the time of sealing. Therefore, similarly to the example of FIG. 11 described above, there is a problem that the metal foil for sealing 212 is cut, twisted and overlapped.
[0009]
Therefore, the present invention was devised to solve such problems, and provides a discharge lamp that does not break and overlap when sealed with a metal foil for sealing when the mount is sealed in a sealed tube. The purpose is to do.
[0010]
[Means for Solving the Problems]
In order to solve the above problems, the invention according to claim 1, the metal solubilized product for performing arc discharge, mercury, supporting the arc tube at least one noble gas is to be sealed, to electrodes this arc tube A lead bar that seals the end side of the lead bar hermetically and extends integrally from the arc tube, a bead tube into which the end of the lead bar in the seal pipe is inserted, and A base member that supports an end of the lead rod inserted into the bead tube, and a plurality of sealing metals that are connected to the outer periphery of the base member between the lead rod and the base member. A foil, a plurality of current collecting members that are electrically connected to each of the metal foils for sealing, and a power supply lead wire that converges and connects the current collecting members. A plurality of recesses formed by reducing the diameter in the diameter direction. The has is at these concave portions is more than the number of the sealing metal foil, which is constituted as a discharge lamp to place a portion of the current collector member to the recessed portion.
[0011]
In the above configuration, the outer periphery of the rear end portion of the base member has concave portions that are more than the number of metal foils for sealing formed by reducing the diameter in the diameter direction, and the metal foil for sealing is formed in these concave portions. By disposing a part of the current collecting member connected to the rear end, the recessed portion suppresses the displacement of the current collecting member on the outer periphery of the base member, and the current collecting member is directly fixed to the base member. The sealing metal foil connected to the current collecting member is also directly fixed to the base member, and does not shift on the outer periphery of the base member in a sealing operation involving rotation.
[0012]
Invention according to claim 2, metal solubilization product for performing arc discharge, a light emitting tube mercury, at least one noble gas is to be sealed, and a lead rod support into the arc tube electrodes, the lead rods A sealing tube that hermetically seals the end of the lead tube and extends integrally from the arc tube, a bead tube into which the end of the lead bar in the sealing tube is inserted, and the lead inserted in the bead tube A base member that supports the end of the rod, a plurality of metal foils for sealing that are connected to the lead rod and attached to the outer periphery of the base member between the sealing tube, and each of these sealing metals A plurality of current collecting members electrically connected to each of the foils, and a power supply lead wire connected by converging each of the current collecting members, and reduced in diameter in the diameter direction on the outer periphery of the rear end portion of the base member A plurality of planar abutting portions formed by Parts is not less than the number of the sealing metal foil, which is constituted as a discharge lamp to place a portion of the current collector member to the abutment portion.
[0013]
In the above configuration, on the outer periphery of the rear end portion of the base member, there are planar contact portions equal to or more than the number of metal foils for sealing formed by reducing the diameter in the diameter direction. By disposing a part of the current collecting member connected to the rear end of the metal foil for sealing, the contact part suppresses the deviation of the current collecting member on the outer periphery of the base member, and the current collecting member becomes the base member. Directly fixed. The sealing metal foil connected to the current collecting member is also directly fixed to the base member, and does not shift on the outer periphery of the base member in a sealing operation involving rotation.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a first embodiment of the invention will be described with reference to the drawings. 1 is a perspective view showing an electrode mount portion of a discharge lamp, FIG. 2 is a cross-sectional view showing an electrode mount portion of the discharge lamp, and FIGS. 3A and 3B are a front view and a perspective view of a base member of the discharge lamp. 8 is a perspective view using a metal molded body as a current collecting member, and FIGS. 9 and 10 are perspective views of the current collecting member of the present invention. In addition, about dimensions, such as a diameter of each structure in FIGS. 1-10, length, thickness, it has emphasized so that the structure of invention may be understood easily, this invention is not specified by the dimension of drawing.
[0015]
In the structure of the direct current type discharge lamp or the alternating current type discharge lamp shown in FIG. 1, an electrode 3 and another electrode (not shown) are arranged opposite to each other in an arc tube 1 surrounding a quartz glass discharge space. The electrode 3 is supported by a mount unit 10, and the mount unit 10 is sealed in a sealing tube 11 extending integrally from the arc tube 1, and is connected to a power supply lead wire 71 at the end of the mount unit. The power supply lead wire 71 is appropriately connected to a power supply base (not shown). The other electrode side may have the same structure as the electrode 3 side. In the arc tube 1, an appropriate amount of at least one of a metal solute (for example, gallium, iron, silver iodide, etc.), a rare gas such as mercury, xenon, or argon is sealed. Light is emitted by arc discharge generated during the period. Further, the arrangement of the electrodes is not limited to the opposed arrangement, and may be appropriately changed depending on the shape of the arc tube or the like.
[0016]
The sealing operation of the mount 10 into the sealing tube 11 is usually performed according to the following procedure.
{Circle around (1)} The mount portion 10 is inserted into the inside of the sealing tube 11 with the end portion sealed.
(2) The inside of the arc tube 1 and the sealing tube 11 is set to a negative pressure.
(3) The sealing tube 11 is rotated about the arc tube axis.
(4) The sealing tube 11 is blown from the outside with a burner, and the current collecting member 80 is gripped from the outside while the diameter of the covered region is reduced, and the position of the mounting portion 10 is adjusted. 11 is sealed.
[0017]
As shown in FIG. 2, the mount portion 10 of the electrode 3 includes a bead tube 4 into which an end of a lead rod 8 press-fitted into the electrode 3 is inserted, and an end of the lead rod 8 inserted into the bead tube 4. A plurality of metal foils 12 for sealing that are connected to the outer peripheral portion of the base member 5 between the base member 5 that supports the portion and the lead rod 8 and between the sealing tube 11 and each of these seals A plurality of current collecting members 80 that are electrically connected to each of the metal foils 12 and power supply lead wires 71 that are connected to each of the current collecting members 80 are connected to each other on the outer periphery of the rear end of the base member 5. The sealing metal foil 12 having a diameter reduced in the diametrical direction has at least the number of the recessed portions 5a, and a part of the current collecting member 80 is disposed in the recessed portions 5a.
[0018]
The lead bar 8, the sealing metal foil 12, the current collecting member 80, and the power supply lead wire 71 are electrically connected. A structure in which a current collecting disk (109A and 209A in FIGS. 11, 12, and 13 in the conventional example) is interposed between the bead tube 4 and the base member 5 so that the lead bar 8 and the metal foil 12 for sealing are made conductive. It doesn't matter.
[0019]
The bead tube 4 is formed of quartz glass or the like, has a through hole inside thereof, and is press-fitted into the electrode 3 in cooperation with a fitting hole formed on the front end surface of the base member 5 formed coaxially. The lead bar 8 is fitted and supported. The support form of the lead bar 8 is not particularly limited to FIGS. 1 and 2, and the above-described current collecting disk is interposed between the bead tube 4 and the base member 5, and no fitting hole is formed in the base member 5. Alternatively, the end face of the lead bar 8 may be directly fixed to the end face of the current collecting disk or the base member 5.
[0020]
The front ends of the plurality of sealing metal foils 12 are sandwiched and fixed between the bead tube 4 and the base member 5, and are electrically connected to the lead bar 8. The fixing form is not limited to FIGS. 1 and 2, and as described above, the sealing metal foil 12 may be sandwiched and fixed between the bead tube 4 and the current collecting disk using the current collecting disk. Usually, a refractory metal such as molybdenum or tungsten is used for the metal foil 12 for sealing and the current collecting disk.
[0021]
A plurality of current collecting members 80 are connected to the rear end of the sealing metal foil 12. This connection form is also not limited to FIG. 1 and FIG. 2, a connection form at the end face of the sealing metal foil 12 and the current collecting member 80, a form in which the current collecting member 80 is connected to the outer surface of the sealing metal foil 12, Any of the forms in which the current collecting member 80 is connected to the inner surface of the metal foil 12 for sealing may be used. However, in view of the strength of fixing force of the metal foil 12 for sealing to the base member 5 and the workability, a form in which the current collecting member 80 is connected to the outer surface of the metal foil 12 for sealing is preferable.
[0022]
Furthermore, the arrangement interval of the metal foil 12 for sealing on the outer periphery of the base member 5 may be appropriately determined according to the use of the discharge lamp. For example, if the discharge lamp requires a large current, the seal The arrangement interval of the metal foil 12 is made uniform. Thereby, the thermal distortion of the sealing part 11, or the crack resulting from this, a rupture, etc. are suppressed.
[0023]
As shown in FIG. 1, as described above, the plurality of current collecting members 80 have their front ends connected to the rear end of the sealing metal foil 12, and a plurality of current collecting members 80 are provided for one sealing metal foil 12. For example, three current collecting members 80 are connected. The rear end portion of the current collecting member 80 is connected to the power supply lead wire 71 using, for example, silver solder.
[0024]
The current collecting member 80 is made of a refractory metal such as molybdenum or tantalum. The shape of the current collecting member 80 is a rod-like shape 80a and a plate-like shape 80b as shown in FIGS. In the shape 80c shown in FIG. 10, it is necessary to devise such as reducing the thickness in order to prevent the occurrence of cracks due to thermal expansion during lighting. Cracks due to thermal expansion are caused by a difference in thermal expansion coefficient between the current collecting member 80 and the base member 5 or the sealing tube 11, and the base member 5 or the sealing tube 11 made of quartz glass or the like is in operation. It is generated because the expansion of the current collecting member 80 due to the heat cannot be absorbed.
[0025]
Furthermore, the arrangement position of the current collecting member 80 is not particularly limited. As shown in FIG. 1, the current collecting member 80 connected to the same sealing metal foil 12 is arranged in the same recessed portion 5a. This is preferable from the viewpoint of the strength of the fixing force to the base member 5 and workability.
[0026]
The reason why the recess 5a as shown in FIGS. 3A and 3B is formed on the outer periphery of the base member 5 is as follows. That is, as shown in FIG. 8, a polygonal recessed portion 5g is provided on the rear end surface of the base member 5, and a metal molding 83 (corresponding to the current collecting member 80 of the present invention) inserted therein is sealed with the metal foil 12 for sealing. Since the metal molded body 83 does not rotate in the sealing operation involving rotation, there is no deviation in the sealing metal foil 12 at the time after sealing, and the sealing metal foil 12 is cut, twisted, and overlapped. Absent. However, since the metal molded body 83 and the quartz glass base member 5 have different coefficients of thermal expansion, they cannot withstand the expansion of the metal molded body 83 during lighting, and cracks occur in the quartz glass base member 5. . The same applies to the relationship with the sealing tube 11 made of quartz glass, and cracks due to the difference in thermal expansion coefficient occur. In addition, it is expensive to provide the polygonal recessed portion 5a on the rear end surface of the quartz glass base member 5. Therefore, the recessed portion 5a is formed on the outer side of the base member 5, that is, on the outer periphery.
[0027]
Further, the reason for disposing a part of the current collecting member 80 in the recessed portion 5a and fixing the sealing metal foil 12 to the base member 5 is to place the sealing metal foil 12 directly along the recessed portion 5a and This is because when the foil 12 and the base member 5 are fixed, a large load is applied to the sealing metal foil 12 due to the rotation at the time of sealing, resulting in breakage.
[0028]
Further, the number of the recessed portions 5a is set to be equal to or greater than the number of the metal foils 12 for sealing so as to be compatible with various uses of the discharge lamp. For example, as in the case of a discharge lamp that requires a large current, due to problems such as thermal distortion of the sealing portion, when it is necessary to arrange the metal foil 12 for sealing evenly, the same number or multiple of the metal foil 12 for sealing is required. A recessed portion 5a is provided. Conversely, when it is necessary to provide non-uniformity in the arrangement interval of the sealing metal foil 12 due to the workability at the time of the sealing operation, by providing the recessed portions 5a more than the number of the sealing metal foils 12 Yes.
[0029]
In the first embodiment of the present invention, a part of the current collecting member 80 is disposed in the recessed portions 5 a equal to or more than the number of the metal foils 12 for sealing, so that the recessed portion 5 a is a base member of the current collecting member 80. 5 prevents the displacement on the outer periphery, and the current collecting member 80 is directly fixed to the base member 5. As a result, the sealing metal foil 12 connected to the current collecting member 80 is directly fixed to the base member 5, and the sealing metal foil 12 does not shift on the outer periphery of the base member 5 in a sealing operation involving rotation. Accordingly, the sealing metal foil 12 is not cut, twisted or overlapped.
[0030]
Further, by providing the recessed portions 5a that are equal to or more than the number of the metal foils 12 for sealing, the arrangement position of the metal foils 12 for sealing on the outer periphery of the base member 5 can be appropriately changed and the degree of freedom is increased. Arrangement design corresponding to the use of the discharge lamp becomes possible.
[0031]
4, 5 and 6 are a front view and a perspective view of a base member 5 having another recessed portion 5b, a recessed portion 5c and a recessed portion 5d. The recess 5b as shown in FIG. 4 has an effect of suppressing cutting, twisting, and overlap because the sealing metal foil 12 is not displaced, but the processing of the recess 5b on the outer periphery of the rear end of the base member 5 is effective. It is necessary to consider the cost of the method. Moreover, in the case of the recessed part 5c as shown in FIG. 5, since the surface of the recessed part 5c is circular, there is little fear that the current collecting member 80 to which the sealing metal foil 12 is connected will be displaced. Therefore, if the flat part 5e is provided in the recessed part 5d as shown in FIGS. 6 (a) and 6 (b), there is no risk that the sealing metal foil 12 is displaced due to the current collecting member 80 being disposed on the flat part 5e. .
[0032]
Next, in the second embodiment of the present invention, instead of the recessed portion 5a in the first embodiment, a planar contact portion 5f formed by reducing the diameter in the diameter direction of the base member 5 is provided. The other configurations are the same as those in the first embodiment. FIG. 7 shows a front view and a perspective view of the base member 5 having the flat contact portion 5f.
[0033]
Also in the second embodiment, by disposing a part of the current collecting member 80 on the planar contact portion 5f, the contact portion 5f suppresses the displacement of the current collection member 80 on the outer periphery of the base member 5. The current collecting member 80 is directly fixed to the base member 5. As a result, the sealing metal foil 12 connected to the current collecting member 80 is directly fixed to the base member 5, and the sealing metal foil 12 does not shift on the outer periphery of the base member 5 in a sealing operation involving rotation. Accordingly, the sealing metal foil 12 is not cut, twisted or overlapped.
[0034]
【Example】
In order to confirm the above, short arc discharge lamps (hereinafter referred to as samples) of the present invention as shown in FIGS. 1 to 3 and 7 were prepared (Examples 1 to 10). The main specifications are shown below.
[0035]
Base member: A quartz glass rod having an outer diameter of 25 mm and a total length of 50 mm was used.
-Shape of base member: Examples 1 to 5 have the recessed portions 5a (a1: 10 mm, a2: 3 mm, a3: 5 mm) shown in FIG. Examples 6 to 10 have contact portions 5f (b1: 15 mm, b2: 15 mm, b3: 15 mm) shown in FIG.
Metal foil for sealing: Four molybdenum foils having a width of 10 mm and a thickness of 0.05 mm were used.
Current collecting member: Three molybdenum rods having an outer diameter of φ0.8 mm were attached to the end portion on the power supply lead wire side per one metal foil for sealing.
-Inclusion material: Xenon gas (pressure at the time of encapsulation is 101325 Pa {1.0 atm}), 0.5 g of mercury
・ Distance between electrodes: 6mm
・ Rated current: 140A
・ Rated voltage: 30V
・ Rated input power: 4200W
[0036]
Moreover, the conventional short arc type | mold discharge lamp (henceforth a sample) shown in FIG. 12, FIG. 13 as object was created (Comparative Examples 1-3). The specifications were the same as those of the present invention except that the rear end portion of the base member did not have the recessed portion 5a and the contact portion 5f.
[0037]
Table 1 shows the results of comparison of the state of the metal foil for sealing after sealing and 500 hours after lighting of the sample having the present invention and the conventional mounting part.
[0038]
[Table 1]

[0039]
According to Table 1, the sample using the base member 5 having the recessed portion 5a according to the present invention finished lighting 500 hours without any problem (Examples 1 to 5). Further, the sample using the base member 5 provided with the contact portion 5f also finished lighting 500 hours without any problem (Examples 6 to 10). On the other hand, the sample without the recessed portion 5a or the flat contact portion 5f had some problems after sealing (Comparative Examples 1 to 3). Of these, two were turned off within 500 hours of lighting (Comparative Examples 1 and 2).
[0040]
Although a short arc type discharge lamp has been described as an example of the discharge lamp, any discharge lamp having a similar electrode mount configuration such as a long arc type discharge lamp, a compact arc type discharge lamp, or a metal halide type discharge lamp may be used. There is no particular limitation.
[0041]
【The invention's effect】
As described above, according to the present invention, the outer periphery of the rear end portion of the base member constituting the mount portion has a recessed portion or a contact portion that is equal to or more than the number of metal foils for sealing. By arranging a part of the current collecting member, the recessed portion or the contact portion suppresses the displacement of the current collecting member on the outer periphery of the base member, and the base member and the current collecting member can be directly fixed. The connected sealing metal foil is also directly fixed to the base member, and the sealing metal foil does not shift on the outer periphery of the base member in the sealing step involving rotation. As a result, the sealing metal foil is not cut, twisted or overlapped.
In addition, since no defects occur in the metal foil for sealing during production, the yield is greatly improved. Further, since the metal foil for sealing is not cut, twisted or overlapped, the mount portion can be firmly sealed with the sealing tube, and the disappearance due to rupture or leakage can be suppressed. Furthermore, the appearance can be improved and the product value can be increased.
In addition, by having concave portions or planar contact portions that are equal to or larger than the number of sealing metal foils, the degree of freedom of arrangement of the sealing metal foil is increased, and a design corresponding to the use of each discharge lamp becomes possible. For example, for a discharge lamp that requires a large current, the spacing between the metal foils for sealing can be made uniform, so that thermal distortion of the sealing portion, cracks, bursts, and the like due to this can be suppressed.
[Brief description of the drawings]
FIG. 1 shows a perspective view of an electrode mount portion in a discharge lamp of the present invention.
2 is a cross-sectional view of the electrode mount portion of FIG.
3A is a front view and FIG. 3B is a perspective view of a base member having a recessed portion in the discharge lamp of the present invention.
4A is a front view of a base member having another recessed portion in the discharge lamp of the present invention, and FIG. 4B is a perspective view thereof.
5A is a front view and FIG. 5B is a perspective view of a base member having another recessed portion in the discharge lamp of the present invention.
6 is a front view of a base member in which a flat portion is provided in the recessed portion of FIG.
7A is a front view and FIG. 7B is a perspective view of a base member having a flat contact portion in the discharge lamp of the present invention.
FIGS. 8A and 8B are perspective views of a base member having a polygonal recessed portion on an end surface and a metal molded body before (a) combination and (b) after combination.
FIG. 9 is a perspective view of a current collecting member having a (a) bar shape (b) plate shape in the discharge lamp of the present invention.
10 shows a perspective view of another shape of the current collecting member of FIG. 9. FIG.
FIG. 11 shows a cross-sectional view of a conventional discharge lamp.
FIG. 12 is a perspective view of an electrode mount portion in another conventional discharge lamp.
13 shows a cross-sectional view of the electrode mount portion of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Light emission tube 3 Electrode 4 Bead tube 5 Base member 5a, 5b, 5c, 5d, 5g Recessed part 5e Plane part 5f Contact part 8 Lead rod 10 Mount part 11 Sealing pipe 12 Sealing metal foil 71 Lead wire 80 for electric power feeding , 80a, 80b, 80c Current collecting member 83 Metal molded body

Claims (2)

Metal solubilized product for performing arc discharge, mercury, a light-emitting tube at least one noble gas is to be sealed, and a lead rod support into electrodes the light-emitting tube, the end portion side of the lead rod hermetically sealed And a sealing tube integrally extending from the arc tube, a bead tube into which an end of the lead rod in the sealing tube is inserted, and a base member for supporting the end of the lead rod inserted into the bead tube A plurality of sealing metal foils that are connected to the outer periphery of the base member between the lead rod and the sealing tube, and a plurality of collections that are respectively connected to the sealing metal foils. An electric member, and a power supply lead wire connected to each of the current collecting members by focusing,
On the outer periphery of the rear end portion of the base member, there are a plurality of recessed portions formed by reducing the diameter in the diameter direction, and these recessed portions are equal to or more than the number of the metal foils for sealing, and the recessed portion A discharge lamp comprising a part of a current collecting member. Metal solubilized product for performing arc discharge, mercury, a light-emitting tube at least one noble gas is to be sealed, and a lead rod support into electrodes the light-emitting tube, the end portion side of the lead rod hermetically sealed And a sealing tube integrally extending from the arc tube, a bead tube into which an end of the lead rod in the sealing tube is inserted, and a base member for supporting the end of the lead rod inserted into the bead tube A plurality of sealing metal foils that are connected to the outer periphery of the base member between the lead rod and the sealing tube, and a plurality of collections that are respectively connected to the sealing metal foils. An electric member, and a power supply lead wire connected to each of the current collecting members by focusing,
On the outer periphery of the rear end portion of the base member, there are a plurality of planar contact portions formed by reducing the diameter in the diameter direction, and these contact portions are equal to or more than the number of the metal foils for sealing, A discharge lamp characterized in that a part of the current collecting member is disposed at the contact portion.

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