JP4670388B2 - High pressure discharge lamp and manufacturing method thereof - Google Patents

Description

  The present invention relates to a high-pressure discharge lamp and a method for manufacturing the same.

  A high-pressure discharge lamp, for example, a high-pressure sodium lamp, includes an arc tube having a cylindrical ceramic envelope and electrode structures sealed at both ends of the envelope with a sealing material. The electrode structure has an electrode portion made of tungsten composed of an electrode rod and an electrode coil attached to the electrode rod, and a niobium power feeding portion to which the electrode portion is connected to an end portion. Yes.

  As an example of a method for connecting an electrode portion and a power feeding portion in a conventional high-pressure sodium lamp, a concave portion recessed inward is formed on the outer surface of the bottom portion of the power feeding portion having a bottomed cylindrical shape, and an electrode rod is formed in the concave portion. A method has been proposed in which the end portions of the two are fitted and fixed with titanium solder to connect each other (see, for example, Patent Document 1).

  In addition, as shown in FIG. 7, a high-pressure sodium lamp currently on the market (hereinafter referred to as “conventional high-pressure sodium lamp”) has a main portion having a bottomed cylindrical shape. A bottomed cylindrical portion 25 having a diameter smaller than the outer diameter of the power feeding portion 24 is formed on the outer surface of the bottom portion 24, and a tungsten electrode rod 27 to which an electrode coil 26 is attached is inserted into the bottomed cylindrical portion 25. In this state, an electrode structure 28 is used in which the opening-side end portion of the bottomed cylindrical portion 25 and the electrode rod 27 are fixed by, for example, laser welding.

Note that in both the conventional high-pressure sodium lamp and another conventional high-pressure sodium lamp, the electrode rod and the electrode coil are integrated by welding in separate processes, and in particular, the electrode coil and the power feeding portion are directly connected by welding or the like. Not connected.
Japanese Utility Model Publication No.59-121153

  In such a conventional high-pressure sodium lamp, tungsten and titanium, which are these constituent materials, are alloyed at the joint portion between the electrode rod and the solder, and as a result, tungsten recrystallizes and becomes brittle. However, there is a problem that the joint portion is broken by an impact during the manufacturing process of the lamp or during the transportation of the lamp. In this conventional high-pressure sodium lamp, niobium and titanium, which are these constituent materials, are alloyed at the joint between the power feeding part and the solder during the life of the lamp, resulting in deformation of the power feeding part. There was also a problem that the electrode rod was misaligned or leaked.

  On the other hand, in another conventional high-pressure sodium lamp, titanium solder is not used for connection between the power feeding portion 24 and the electrode rod 27, so that it is expected that the above-described problems in the conventional high-pressure sodium lamp do not occur.

  However, this conventional high pressure sodium lamp still has a problem that the electrode rod 27 is broken due to an impact during the lamp manufacturing process or during the transportation of the lamp.

  As a result of various studies on the cause, the present inventors considered as follows. That is, in the electrode structure 28 used in another conventional high-pressure sodium lamp, the power feeding portion 24 and the electrode rod 27 are welded. At the time of the welding, niobium and the electrode that are constituent materials of the power feeding portion 24 are used. It was thought that this was because tungsten, which is a constituent material of the rod 27, was alloyed, which caused the tungsten to recrystallize and become brittle. In preventing this embrittlement, for example, when laser welding is used as the fixing method, it is conceivable to reduce the laser output. However, in this case, if the output of the laser is lowered so as to prevent embrittlement, there is a possibility that the feeding portion 24 and the electrode rod 27 are not sufficiently fixed, which is not appropriate.

  The present invention has been made to solve such a problem, and even when the electrode portion and the power feeding portion are connected without using a connecting member such as titanium solder, the electrode rod is extremely broken. An object of the present invention is to provide a high-pressure discharge lamp that can be made difficult, and a method for manufacturing the same.

The high-pressure discharge lamp of the present invention includes an arc tube having an envelope and an electrode structure sealed to the envelope, the electrode structure being located in the envelope, and an electrode An electrode portion composed of a rod and an electrode coil attached to the electrode rod, and a power feeding portion to which the electrode portion is connected at an end, and the connection between the electrode portion and the power feeding portion In the portion, a part of the power feeding portion melted and solidified is present in at least a gap between the electrode rod and the electrode coil, and is fixed to the electrode rod and the electrode coil, respectively. The electrode rod, the electrode coil, and the power feeding unit are integrated.

A method for manufacturing a high-pressure discharge lamp according to the present invention includes an arc tube having an envelope and an electrode structure sealed to the envelope, and the electrode structure is attached to the electrode rod and the electrode rod. A method of manufacturing a high-pressure discharge lamp having an electrode portion composed of a formed electrode coil and a power feeding portion to which the electrode portion is connected to an end portion, in the manufacturing process of the electrode structure , After inserting the electrode coil into the electrode rod and assembling the electrode part, and after bringing the electrode part close to or in contact with a part to be connected to the electrode part in the power feeding part, The planned connection portion is melted, and the melted planned connection portion enters at least a gap between the electrode rod and the electrode coil to solidify, and the electrode rod, the electrode coil, and the power feeding unit are integrated. Integration process It is used as a method comprising.

  The present invention provides a high-pressure discharge lamp that can make an electrode rod extremely difficult to break even when the electrode part and the power feeding part are connected without using a connecting member such as titanium solder, and a method for manufacturing the same. Is something that can be done.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  As shown in FIG. 1, a high-pressure sodium lamp 1 with a built-in starter having a rated power of 180 [W] according to an embodiment of the present invention is closed at one end in a substantially hemispherical shape, and a stem 2 at the other end. A sealed straight tubular outer tube 3, a screw-type base 4 attached to the end of the outer tube 3 on the stem 2 side, an arc tube 5 accommodated in the outer tube 3, and an outer tube A known starter 6 for starting the arc tube 5 is provided in the space between the stem 2 and the arc tube 5 in the tube 3.

  The central axis X in the longitudinal direction of the outer tube 3 and the central axis Y in the longitudinal direction of the arc tube 5 are located on substantially the same axis.

  The outer tube 3 is made of, for example, hard glass or quartz glass. The inside of the outer tube 3 is in a vacuum state.

  The stem 2 is partially sealed with two lead wires 7 and 8. One end of each of the lead wires 7 and 8 is drawn into the outer tube 3 and mechanically and electrically connected to a power feeding unit 16 of the arc tube 5 described later. The other ends of the lead wires 7 and 8 are led out of the outer tube 3, the other end of one lead wire 7 is in the shell portion 4 a of the base 4, and the other end of the other lead wire 8 is in the base. The four eyelet portions 4b are electrically connected to each other.

  The lead wires 7 and 8 are usually formed by connecting and integrating a plurality of metal wires.

  As shown in FIG. 2, the arc tube 5 is a translucent ceramic having a substantially cylindrical cylindrical portion 9 and a ring-shaped closed portion 10 integrated by shrink fitting at both ends of the cylindrical portion 9. For example, an envelope 11 made of polycrystalline alumina and an electrode structure 13 sealed at both ends of the envelope 11 with a sealing material 12 are provided. The arc tube 5 is filled with a predetermined amount of sodium as a luminescent material, mercury as a buffer gas, and a rare gas such as xenon gas as a starting aid. Further, as shown in FIG. 1, a starting auxiliary conductor 14 is attached to the outer surface of the arc tube 5 along the longitudinal direction of the arc tube 5.

  Sodium and mercury are enclosed in the form of sodium amalgam (sodium: 20% by weight, mercury 80% by weight).

  As shown in FIG. 2, the electrode structure 13 passes through the tungsten electrode portion 15 located in the envelope 11 and the closing portion 10, the electrode portion 15 is connected to one end, and the other end The power supply unit 16 made of niobium is led to the outside of the envelope 11. The distance between the electrode parts 15 is 85 [mm]. Of course, the constituent material itself of the electrode portion 15 is mainly composed of tungsten (W) and is a known material. The constituent material itself of the power feeding section 16 is also a known material having niobium (Nb) as a main component.

  2 shows only the structure of one end, the structure of the other end also has the same configuration.

  As shown in FIG. 3, the electrode portion 15 has an electrode rod 17 having a length of 6.3 [mm] and a diameter of 0.7 [mm], and a wire diameter of 0.4, for example, attached to the electrode rod 17. [Mm] electrode coil 18. One end of the electrode rod 17 projects 0.5 mm toward the discharge space with respect to the electrode coil 18, and the other end of the electrode rod 17 faces away from the discharge space with respect to the electrode coil 18. It protrudes 0.9 [mm]. The electrode coil 18 is composed of, for example, a single-turn densely wound coil of 12 turns, a first coil portion 19 (3 turns) having a coil inner diameter of 0.7 [mm], and a second coil having an inner diameter of 1.8 [mm]. Coil portion 20 (9 turns). Further, in the gap between the electrode rod 17 and the second coil portion 20, an internal coil (not shown) having an electron radioactive substance attached to the surface is inserted into the electrode rod 17 and arranged. The internal coil is held in the gap by caulking a part of the second coil portion 20.

  The power feeding portion 16 has a bottomed tube having an outer diameter of 3.0 [mm] and an inner diameter of 2.5 [mm], one end of which is closed in a substantially tapered shape at the main portion, and the other end opened. A substantially cylindrical bottomed cylindrical portion 22 is formed on the outer surface of the bottom portion 21. The bottomed cylindrical portion 22 has an outer diameter of 1.46 [mm], an inner diameter of 0.96 [mm], and a depth of 0.9 [mm] before melting and solidification described later. Moreover, the bottom part of the bottomed cylinder part 22 is substantially flat. The total length of the power feeding part 16 is 13.0 [mm] including the bottomed cylindrical part 22.

  In addition to the bottomed cylindrical shape, the shape of the portion excluding the bottomed cylindrical portion 22 of the power feeding unit 16 may be, for example, a hollow shape with both ends closed or a rod-shaped shape. it can. Of course, the bottomed cylindrical portion 22 is formed on the end surface of such a hollow or rod-shaped member.

  On the other end side of the electrode rod 17, substantially the entire 0.9 mm portion protruding from the electrode coil 18 is inserted into the bottomed cylindrical portion 22. Therefore, before the melting and solidifying, the tip of the first coil portion 19 of the electrode coil 18 that is closest to the power supply portion 16 side is in contact with the end surface of the bottomed cylindrical portion 22 on the opening side. It will be.

Then, in this state, as shown in FIG. 4, the end portion on the opening side of the bottomed cylindrical portion 21 that is a part of the power feeding portion 16 is melted, and the melted product becomes the electrode rod 17 and the electrode coil 18. In particular, it enters the gap between the first coil portion 19 and the turn closest to the power feeding section 16, and is fixed and solidified on the surface of the electrode rod 17 and the surface of the electrode coil 18 in the gap. In addition, the molten material may be formed in the surface of the other end portion of the electrode rod 17 other than the portion where the gap is formed, or in the first coil portion 19 of the electrode coil 18. It is also fixed and solidified in the parts other than where it is formed. In this way, the end portion on the opening side of the bottomed cylindrical portion 22 that is a part of the power feeding portion 16 is melted and solidified and exists in the gap between the electrode rod 17 and the electrode coil 18. The material fixed to each of the electrode rod 17 and the electrode coil 18, and melted and solidified is directly fixed to the electrode rod 17 and the electrode coil 18, respectively. 18 are integrated and electrically and mechanically connected to each other.

  Of course, the melted and solidified material may simply be in contact with and fixed to the electrode rod 17 or the electrode coil 18, or niobium and tungsten, which are constituent materials, may be alloyed at the connecting portion. Sometimes it is. For example, in the example shown in FIG. 4, in the region A, when the bottomed cylindrical portion 22 is melted, a part of the electrode coil 18 is also melted, and an alloy of niobium and tungsten which are constituent materials thereof is formed. . In the region B, niobium, which is a constituent material of the molten bottomed cylindrical portion 22, and tungsten, which is a constituent material of the electrode rod 17, are alloyed.

  Here, it is preferable that at least a part of the electrode rod 17 is in contact with the inner surface of the bottomed tube portion 22 in the portion located in the bottomed tube portion 22. As a result, when some stress is applied to the electrode rod 17 or the electrode coil 18, particularly when stress is applied from a direction perpendicular to the longitudinal direction of the electrode rod 17, the stress can be dispersed to the contacted portion, and the melting The stress applied to the fixed portion between the solidified electrode rod 17 and the fixed portion between the melted and solidified electrode electrode 18 can be reduced, and the fixed portions can be prevented from coming off. be able to. Further, when such stress is applied from the outside, even if tungsten, which is a constituent material of the electrode rod 17, is partially embrittled, the electrode rod 17 is prevented from being broken at the embrittled portion. Can do.

  Next, a manufacturing method of the high-pressure sodium lamp 1 with a built-in starter having a rated power of 180 [W] according to an embodiment of the present invention will be described. However, since a known method is used for processes other than the manufacturing process of the electrode structure 13, such as a lamp assembly process, detailed description thereof is omitted here, and only the manufacturing process of the electrode structure 13 is described. .

  First, power supply in which one end portion is closed in a substantially tapered shape in advance, and the shape of a main portion (a portion excluding the bottomed cylindrical portion 22) in which the bottomed cylindrical portion 22 is formed on the outer surface of the bottom portion is a bottomed cylindrical shape. The part 16, the electrode rod 17, and the electrode coil 18 wound beforehand in a desired shape are prepared.

  In the first step (electrode portion assembly step), the electrode coil 15 is inserted into a predetermined position of the electrode rod 17 to assemble the electrode portion 15. In this state, the electrode coil 18 is simply inserted into the electrode rod 17 and is not fixed to the electrode rod 17. Here, after the electrode coil 18 is inserted into the electrode rod 17, the first coil portion 19 and the electrode rod 17 of the electrode coil 18 are preferably fixed and integrated by, for example, resistance welding. As a result, when the electrode portion 15 is handled as a part in the manufacturing process of the electrode structure 13, the position of the electrode coil 18 with respect to the electrode rod 17 is not shifted, and the handling becomes easy. Since the fixing strength between the electrode coil 18 and the electrode coil 18 can be increased, the electrode coil 18 can be reliably fixed to the electrode rod 17 in the completed electrode structure 13.

  Thereafter, in the second step (integration step), the electrode unit 15 is brought close to or in contact with a portion to be connected to the electrode unit 15 in the power feeding unit 16. That is, as shown in FIG. 5, the power feeding unit 16 is held so that its longitudinal direction is horizontal, and the electrode unit 15 is connected to the other end of the electrode rod 17 and the open end of the bottomed cylindrical unit 22. The central axis in the longitudinal direction of the power feeding unit 16 and the central axis in the longitudinal direction of the electrode rod 17 are arranged on the same axis so as to face each other. Next, the electrode portion 15 is moved to the power feeding portion 16 side, and almost the entire other end portion of the electrode rod 17 in the electrode portion 15 is inserted into the bottomed cylindrical portion 22 and held in this state. At this time, of the first coil portion 19 of the electrode coil 18, the tip end portion of the turn closest to the power feeding portion 16 is in contact with the end surface on the opening side of the bottomed cylindrical portion 22.

  Here, when the other end portion of the electrode rod 17 in the electrode portion 15 is inserted into the bottomed cylindrical portion 22, the inner diameter of the bottomed cylindrical portion 22 (for example, 0.96 [ mm]) is preferably set to have a tolerance with respect to the diameter of the electrode rod 17 (for example, 0.7 [mm]). And when making the inside diameter of the bottomed cylindrical part 22 sufficiently large with respect to the diameter of the electrode bar 17 in this way, after inserting the electrode bar 17 into the bottomed cylindrical part 22, It is preferable that a part of the bottomed cylindrical portion 22, for example, an end portion (scheduled connection portion) on the opening side is caulked so that the planned connection portion is in contact with or close to the electrode rod 17 as much as possible. As a result, when the portion to be connected is melted as will be described later, the melted material is surely inserted into the gap between the electrode rod 17 and the electrode coil 18, and the melted and solidified electrode rod 17 and electrode The fixing strength with the coil 18 can be increased.

  The “scheduled connection portion” mentioned here is mainly an end portion on the opening side of the bottomed cylindrical portion 22. However, when a “recessed portion” is formed instead of the “bottomed cylindrical portion 22” as will be described later, an end portion on the opening side of the recessed portion becomes a “scheduled connection portion”. Further, when neither the “bottomed cylindrical portion 22” nor the “recessed portion” is formed in the power feeding portion, for example, in the case of a power feeding portion having a simple bottomed cylindrical shape, the bottom portion becomes the “connection planned portion”.

  In addition, the electrode unit 15 does not necessarily need to “contact” the portion to be connected to the electrode unit 15 in the power supply unit 16, but may be “close”. That is, it is only necessary that the portion to be connected is melted as will be described later, and the melted material is “close” so that the melt can enter the gap between the electrode rod 17 and the electrode coil 18.

  Then, in this state, as shown in FIG. 6, the laser beam 23 is irradiated from a direction substantially perpendicular to the longitudinal direction of the electrode rod 17 to an arbitrary portion of the opening-side end portion of the bottomed cylindrical portion 22. And melt that part. As shown in FIG. 4, the melt adheres to the surface of the electrode rod 17 and the surface of the electrode coil 18 located in the vicinity thereof, and enters the gap between the electrode rod 17 and the electrode coil 18 by capillary action. Thereafter, the melt is solidified by, for example, natural cooling or forced cooling. The electrode rod 17 and the electrode coil 18 that are melted and solidified in this manner are fixed to each other, and the electrode rod 17 and the electrode coil 18 are fixed to each other through the material that is melted and solidified. Are integrated.

  Here, the irradiation direction of the laser beam 23 is not particularly limited, but from the viewpoint of easy positioning of the irradiation position of the laser beam 23, the laser beam 23 is approximately in the longitudinal direction of the electrode rod 17. It is preferable to irradiate from a vertical direction. On the other hand, as shown by the broken line in FIG. 6, by irradiating the laser beam 23 toward the predetermined irradiation position from the vicinity of the power supply unit 16, the melt easily flows to the electrode coil 18 side. While being able to adhere to the outer surface of the electrode coil 18 in a wider range, it becomes easier for the melt to enter the gap between the electrode rod 17 and the electrode coil 18, and the amount of penetration can be further increased.

  Further, as an example, the case where the laser beam 23 is irradiated to any one point on the opening side end portion of the bottomed cylindrical portion 22 has been described, but as the irradiation position of the laser beam 23 in that case, the bottomed cylindrical portion It is preferable that it is the vicinity including the part which the 1st coil part 19 is contact | abutting among the edge parts by the side of 22 opening. As a result, the melt can directly enter the gap between the electrode rod 17 and the first coil portion 19 in contact therewith. As a result, the amount of the melt that enters the gap between the electrode rod 17 and the electrode coil 18 can be increased, so that the three members of the power feeding unit 16, the electrode rod 17 and the electrode coil 18 are firmly fixed to each other. be able to. Further, although irradiation with the laser beam 23 is sufficient even at one point, for example, in order to surely allow the melt to enter the gap between the electrode rod 17 and the electrode coil 18, two points, three points or You may go further. Thus, when irradiating multiple points | pieces with the laser beam 23, in order to make a melt enter into the clearance gap between the electrode rod 17 and the electrode coil 18 with sufficient balance, it is preferable that the irradiation position is equal intervals. .

  In the above example, when the laser beam 23 is irradiated, the electrode unit 15 and the power feeding unit 16 are held in such a posture that their longitudinal directions are horizontal, and the laser beam 23 is irradiated. It is preferable that the end of the bottomed cylindrical portion 22 on the opening side is melted by irradiating the laser beam 23 while holding the power feeding portion 16 vertically so that the power feeding portion 16 is positioned downward. In this case, since the melt easily flows downward due to its own weight, the melt can be adhered to a wider area on the outer surface of the electrode rod 17 and the electrode coil 18, and the melt can be attached to the electrode rod 17 and the electrode coil 18. It becomes easier to enter due to the gap between them, and the amount of entering can be further increased.

  The laser beam 23 does not have to be directly irradiated to the opening-side end portion of the bottomed cylindrical portion 22, that is, the connection planned portion, and may be irradiated to the vicinity of the connection planned portion. This is because even if the laser light 23 is irradiated in the vicinity of the portion to be connected, the portion to be connected only has to be melted by the heat.

  In particular, when the molten material (the melted portion to be connected) enters the gap between the electrode rod 17 and the electrode coil 18, at least a portion of the electrode coil 18 that forms the gap is heated. It is preferable to keep it. As a result, the melt can easily become familiar with tungsten, which is a constituent material of the heated electrode coil 18, and the melt can enter deep into the gap between the electrode rod 17 and the electrode coil 18. It is possible to increase the fixing area between the solidified material and the electrode rod 17 and the fixed area between the solidified material and the electrode coil 18, and to increase the fixing strength of each. At this time, as shown in FIG. 6, at the same time as irradiating the opening side end portion (the connection scheduled portion) of the bottomed cylindrical portion 22, a part of the laser beam 23 is applied to the planned connection portion. It is preferable to irradiate the turn that is closest to the power feeding unit 16 among the electrode coils 18 that are close to or in contact with each other, for example, the first coil portion 19. This makes it possible to use the laser beam 23 as it is when heating at least the portion of the electrode coil 18 that forms the gap, so that it is not necessary to provide a special heating means, and the equipment and processes therefor An increase in the number can be suppressed, and an increase in manufacturing cost associated therewith can be suppressed.

  As the laser beam 23, a YAG laser was used. At that time, by setting the peak value of the output energy within the range of 1.0 [kW] to 2.5 [kW] and the pulse width (irradiation time) within the range of 5 [msec] to 20 [msec]. It was possible to minimize the energy required for melting and obtain the necessary melting amount. As a result, the embrittlement of tungsten, which is a constituent material of the electrode rod 17, can be further suppressed, and the electrode rod 17 can be made more difficult to break. Of course, as the laser beam 23, various known lasers other than the YAG laser can be used as long as they can melt the power feeding unit 16, such as a semiconductor laser. Moreover, what is necessary is just to set output energy etc. suitably according to the characteristic of the laser beam.

  According to the configuration of the high-pressure sodium lamp 1 with a built-in starter having a rated power of 180 [W] according to the embodiment of the present invention as described above, at least a part of the melted power feeding part 16 is at least the electrode rod 17 and the electrode. Since it has entered the gap between the coil 18 and solidified, the melted and solidified material is fixed to the electrode rod 17 and the electrode coil 18 so as to be entangled with each other, and the power feeding portion 16 is connected to the electrode rod 17 and the electrode coil. 18 can be very firmly fixed to each other. Therefore, in melting a part of the power feeding part 16, the power feeding part 16 is slightly smaller than the electrode structure in which the electrode part and the power feeding part used in another conventional high-pressure sodium lamp are connected by welding. As a result, the amount of heat applied to the power supply portion 16 can be significantly reduced, so that the amount of heat applied to the electrode rod 17 can be significantly reduced. Therefore, it is possible to suppress recrystallization and embrittlement of tungsten, which is a constituent material of the electrode rod 17, and it is possible to prevent the electrode rod 17 from being broken due to this. Moreover, unlike the conventional high-pressure sodium lamp in which the electrode portion 15 and the power feeding portion 16 are connected using a connecting member such as titanium solder, titanium solder is not used for the connection between the electrode portion 15 and the power feeding portion 16. Therefore, it is possible to prevent niobium, which is a constituent material of the power feeding section 16, and titanium from alloying and the niobium is deformed to cause the electrode rod 17 to be misaligned or to leak.

  Next, an experiment was conducted to confirm the operational effect of the high-pressure sodium lamp 1 with a built-in starter having a rated power of 180 [W] according to the embodiment of the present invention (hereinafter referred to as “the product of the present invention”).

  First, 25 electrode structures 13 manufactured by the manufacturing method described above were prepared. Then, the resistance strength [kg] of the 25 samples was examined. However, the adhesion strength was examined as follows. That is, the end of the power supply unit 16 on the opening side was held by the chuck in a state where the electrode structure 13 was erected vertically so that the power supply unit 16 was positioned above and the electrode unit 15 was positioned below. In this state, the tip of the electrode rod 17 was pushed perpendicularly to the longitudinal direction of the electrode rod 17, and the force of gradually pushing the electrode rod 17 until it broke was increased. Here, the force applied when the electrode rod 17 was broken was defined as the contact strength [kg].

  According to the present inventors, if the resistance strength is 0.2 [kg] or more, the electrode portion 15 is broken by an impact applied from the outside during actual use, for example, during the manufacturing process of the lamp or during the transportation of the lamp. It has been confirmed that it is possible to significantly reduce problems such as

  As a result, the adhesion strength in the 25 samples was in the range of 0.71 [kg] to 1.67 [kg], and averaged 0.95 [kg].

  Therefore, in the product of the present invention, it is confirmed that the electrode structure 13 has a bending strength that can sufficiently withstand actual use, and the variation in the contact strength is small. Confirmed that it can be obtained.

  In the present embodiment, the case where the bottomed cylindrical portion 22 is formed at the end of the power feeding portion 16 has been described. However, instead of the bottomed cylindrical portion 22, the end of the power feeding portion is used. Even in the case where a recess having a recess recessed inside is used, the same effect as described above can be obtained. However, it is not always necessary to form the bottomed cylindrical portion 22 or the concave portion, and the electrode portion 15 may be fixed and connected to the outer surface of the bottom portion of the simple bottomed cylindrical power feeding portion. However, in the manufacturing process of the electrode structure 13, the position of the electrode unit 15 with respect to the power feeding unit 16 can be easily regulated when the electrode unit 15 is brought close to or in contact with the portion to be connected to the electrode unit 15 in the power feeding unit 16. From the viewpoint that it can be performed, it is preferable to form the bottomed cylindrical portion 22 and the concave portion.

  Moreover, although this Embodiment demonstrated the case where it had a bottomed cylindrical shape as a shape of the main part (part except the bottomed cylinder part 22) of the electric power feeding part 16, the shape of the part is a bottomed cylindrical shape. However, the present invention is not limited to this, and the same effect as described above can be obtained even in a hollow shape in which both ends are closed or a simple rod shape. Of course, you may form the said recessed part in such a hollow thing and a rod-shaped thing.

  Furthermore, in the present embodiment, the single-die metal type high-pressure sodium lamp with a built-in starter having a rated power of 180 [W] has been described as an example. However, the present invention can be applied not only to the single-ended metal type but also to the high-pressure sodium of the double-ended metal type, and not only to the built-in starter type, but also to the high-pressure sodium lamp with an external starter. Furthermore, it can be applied to a high color rendering high pressure sodium lamp. Further, the present invention is not limited to the one having a rated power of 180 [W], and in the case of a high-pressure sodium lamp with a built-in starter, for example, a built-in starter having a rated power of 70 [W] to 940 [W]. It can be applied to high pressure sodium lamps in the shape.

  The present invention relates to a high-pressure discharge lamp that requires an electrode rod to be extremely difficult to break even when the electrode portion and the power feeding portion are connected without using a connection member such as titanium solder, and a method for manufacturing the same. Can also be applied.

Partially cutaway front view of a high-pressure sodium lamp with a built-in starter according to an embodiment of the present invention Partially cutaway front view of arc tube used in high pressure sodium lamp Partially cutaway front view of electrode structure used in high pressure sodium lamp Similarly, an enlarged cross-sectional view of an electrode structure used in a high-pressure sodium lamp The figure which shows the manufacturing process of the electrode structure similarly used for a high pressure sodium lamp Another figure showing the manufacturing process of the electrode structure also used in the high-pressure sodium lamp Partially cutaway front view of electrode structure used in another conventional high pressure sodium lamp

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 High pressure sodium lamp 2 Stem 3 Outer tube 4 Base 4a Shell part 4b Eyelet part 5 Light emitting tube 6 Starter 7, 8 Lead wire 9 Cylindrical part 10 Closure part 11 Enclosure 12 Seal material 13 Electrode structure 14 Start-up auxiliary conductor 15 Electrode part 16 Power feeding part 17 Electrode rod 18 Electrode coil 19 First coil part 20 Second coil part 21 Bottom part 22 Bottomed cylindrical part 23 Laser light

Claims (9)

An arc tube having an envelope and an electrode structure sealed to the envelope;
The electrode structure is located in the envelope and is composed of an electrode rod and an electrode coil attached to the electrode rod, and a power feeding portion in which the electrode portion is connected to an end portion And
In the connection part between the electrode part and the power feeding part, a part of the power feeding part melted and solidified is present at least in the gap between the electrode bar and the electrode coil, and the electrode bar and the electrode It is fixed to each coil,
The high-pressure discharge lamp, wherein the electrode rod, the electrode coil, and the power feeding unit are integrated. The electrode part and the power feeding part are connected by inserting a part of the electrode rod into a recess or a bottomed tube part formed at an end of the power feeding part,
In the connection part between the electrode part and the power feeding body, the end part on the opening side of the recessed part or the bottomed cylindrical part is melted and solidified, and exists at least in the gap between the electrode rod and the electrode coil Are fixed to the electrode rod and the electrode coil,
The high-pressure discharge lamp according to claim 1, wherein the electrode rod, the electrode coil, and the power feeding unit are integrated.   The high-pressure discharge lamp according to claim 2, wherein a part of the electrode rod is in contact with an inner surface of the concave portion or the bottomed cylindrical portion. An arc tube comprising an envelope and an electrode structure sealed to the envelope, the electrode structure comprising an electrode rod and an electrode coil attached to the electrode rod And a power supply part having the electrode part connected to the end part, wherein the electrode coil is inserted into the electrode bar in the manufacturing process of the electrode structure. , An electrode part assembly step for assembling the electrode part;
After the electrode portion is brought close to or in contact with the portion to be connected to the electrode portion of the power feeding portion, the portion to be connected is melted, and the molten portion to be connected is at least the electrode rod and the electrode. A method for manufacturing a high-pressure discharge lamp, comprising: an integration step in which the electrode rod, the electrode coil, and the power feeding unit are integrated by being inserted into a gap between the coils and solidified.   5. The method of manufacturing a high-pressure discharge lamp according to claim 4, wherein, in the electrode part assembly step, after the electrode coil is inserted into the electrode rod, the electrode rod and the electrode coil are welded and integrated. .   In the integration step, the electrode coil is brought close to or in contact with the planned connection portion when the electrode portion is brought close to or in contact with the planned connection portion with the electrode portion in the power feeding portion. A method for manufacturing a high-pressure discharge lamp according to claim 4 or 5.   In the integration step, the portion to be connected is melted by irradiation with laser light, and the portion to be connected is irradiated with the laser light and at the same time a part of the laser light is close to the portion to be connected. The method for manufacturing a high-pressure discharge lamp according to claim 6, wherein the electrode coil in contact is irradiated.   In the integration step, when the molten portion of the planned connection portion is inserted into the gap between the electrode rod and the electrode coil, at least a portion of the electrode coil that forms the gap is heated. The method for manufacturing a high-pressure discharge lamp according to any one of claims 4 to 7, wherein: In the integration step, after the electrode part is brought close to or in contact with a part to be connected to the electrode part in the power feeding part, the electrode part is located below and the power feeding part is located above. The method for manufacturing a high-pressure discharge lamp according to any one of claims 4 to 8, wherein the connection-scheduled portion is melted in a state where these are set up vertically.

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