JP6103868B2 - Discharge lamp and discharge lamp manufacturing method - Google Patents

Description

  The present invention relates to a discharge lamp and a method for manufacturing a discharge lamp.

Patent Document 1 discloses a conventional example of a discharge lamp.
This discharge lamp has an electrode (cathode or anode) located in a glass discharge vessel, an electrode rod (electrode core rod) that supports the electrode at one end, and is spaced from the electrode on the peripheral surface of the electrode rod. And a sealed tube (side tube) which is welded to the outer peripheral surface of the glass tube and forms a part of the discharge vessel and has one end connected to the arc tube. Furthermore, although there is no clear disclosure in Patent Document 1, generally, a metal ring located on the opposite side of the electrode with a glass tube interposed is attached to the peripheral surface of the electrode rod.

  When welding a sealing tube with respect to the outer peripheral surface of a glass tube, in order to heat the whole sealing tube uniformly, a sealing tube is rotated with a glass tube. Then, since a glass tube will move to an axial direction with the rotation operation of a sealing tube, a clearance gap will be easy to be formed in the opposing surface of a glass tube and a metal ring. If the sealing tube is welded to the glass tube with a gap formed between the opposing surfaces of the glass tube and the metal ring, when the discharge vessel is at a high pressure during the operation of the discharge lamp, A crack occurs in a portion facing the gap, and the discharge vessel may be damaged due to the crack.

However, the discharge lamp of Patent Document 1 includes a coil member for solving this problem.
The coil member of Patent Document 1 is obtained by winding a tungsten wire doubly around an electrode rod, and its electrode side end is separated from the electrode. On the other hand, the glass tube side end of the coil member is in contact with the end surface of the glass tube, so that the glass tube is restricted from sliding on the electrode rod on the electrode side. There will be no gaps.
Therefore, even if the sealing tube is rotated when the sealing tube is welded to the outer peripheral surface of the glass tube, it is difficult to form a gap between the opposing surfaces of the glass tube and the metal ring. .

Japanese Patent No. 3562271 JP 2009-231022 A Japanese Patent No. 4963821

However, the coil member disclosed in Patent Document 1 does not form a coil shape before being attached to the electrode rod, but becomes a coil shape only after being wound around the electrode rod. In other words, since the tungsten wire is double and tightly wound around the electrode rod while being plastically deformed, the mounting operation of the coil member to the electrode rod is very troublesome. In particular, when a recess (for example, see the recess formed in the end surface of the electrode side glass tube in Patent Document 2) for receiving the glass tube side end of the coil member is formed on the end surface of the glass tube, the mounting operation is extremely difficult. It becomes.
Furthermore, there is a drawback that it is very troublesome to adjust the position of the coil member with respect to the electrode rod after the coil member is once wound around the electrode rod.

  The present invention makes it possible to easily and reliably attach a coiled stopper for restricting the glass tube from sliding to the electrode side with respect to the electrode rod during the welding operation of the sealing tube to the glass tube. Disclosed is a discharge lamp and a method for manufacturing the discharge lamp.

The discharge lamp of the present invention is mounted with an electrode positioned in the arc tube of a glass discharge vessel, an electrode rod supporting the electrode at one end, and an outer peripheral surface of the electrode rod spaced apart from the electrode. A coiled stopper made of a metal wire material, which is welded to the outer peripheral surface of the glass tube, forms a part of the discharge vessel and is continuous with the arc tube, and is attached to the outer peripheral surface of the electrode rod And the coiled stopper has a glass tube side end abutting the end surface of the glass tube on the electrode side, and has a smaller diameter or the same diameter as the electrode rod in a diameter increasing direction from a free state. From the glass tube side end portion, which is constituted by a coil portion constituted by a part of the metal wire, and an end portion of the metal wire, the inner surface of which is in close contact with the outer peripheral surface of the electrode rod in an elastically deformed state. A pair located on the electrode side E Bei and the end structure section, the one of the pair of the end configuration portion, is characterized that you configure the glass tube side projections projecting to the electrode side from the glass tube end.

The glass tube side protrusion may be positioned on the outer peripheral side of the coil portion.
Further, when viewed in the axial direction of the coil portion from the other end component side, the other end portion and the glass tube side protrusion are less than 180 ° in the circumferential direction of the coil portion. And when the glass tube side protrusion and the other end component are moved closer to each other in the circumferential direction, the diameter of the coil portion may be increased.

  The tip of the glass tube side protrusion may be positioned closer to the glass tube than the end of the coil portion on the electrode side.

  The other end portion constituting portion may constitute an electrode side protruding portion that protrudes from an end portion on the electrode side of the coil portion.

  Moreover, you may comprise the other said edge part structure part by the edge part by the side of the said electrode of the said coil part.

In another aspect of the discharge lamp, the present invention provides an electrode located in the arc tube of a glass discharge vessel, an electrode rod that supports the electrode at one end, and the electrode on the outer circumferential surface of the electrode rod. A metal tube that is mounted on the outer peripheral surface of the glass tube, the glass tube that is mounted separately, the sealing tube that is part of the discharge vessel and that is continuous with the arc tube, and that is welded to the outer peripheral surface of the glass tube A coiled stopper, and the coiled stopper has a glass tube side end that abuts on the electrode side end surface of the glass tube, and is in a free state having a smaller diameter or the same diameter as the electrode rod. The glass tube formed by a coil portion constituted by a part of the metal wire and both ends of the metal wire, the inner surface of which is in close contact with the outer peripheral surface of the electrode rod while being elastically deformed from From the side edge to the electrode side And a pair of end configuration portion positioned, and wherein the coil unit is single-wound structure.

  The coiled stopper may be made of a metal containing any one of tungsten, tantalum, molybdenum, and niobium.

The method for producing a discharge lamp according to the present invention comprises an electrode located in an arc tube of a glass discharge vessel, an electrode rod supporting the electrode at one end, and an outer peripheral surface of the electrode rod spaced from the electrode. And a glass tube welded to the outer peripheral surface of the glass tube, forming a part of the discharge vessel and continuing to the arc tube, and a metal wire mounted on the outer peripheral surface of the electrode rod A coiled stopper, and the coiled stopper has a glass tube side end capable of contacting the electrode side end surface of the glass tube and has a smaller diameter than the electrode rod when in a free state. Or a coil part constituted by a part of the metal wire having the same diameter, and a pair of end part parts located on the electrode side from the glass tube side end part respectively constituted by both ends of the metal wire, have a pair of said end forming portion On the other hand It is a method for manufacturing a discharge lamp constituting the glass tube side projections projecting to the electrode side from the glass tube end, the coil portion in the diameter or the diameter of a free state from said electrode rod the while gripping the glass tube side projections while being elastically deformed in the diameter direction until the diameter larger than the electrode rod, while elastically deforming the diameter direction until the diameter larger than the electrode rod, the coil An inserting step of inserting the electrode rod into the portion, the end portion on the glass tube side is brought into contact with the end surface on the electrode side of the glass tube, and the coil portion is caused by the elastic force in the reduced diameter direction generated by the coil portion A mounting step of closely contacting the inner surface of the glass rod to the outer peripheral surface of the electrode rod, and a welding step of covering the outer peripheral surface of the glass tube with the sealing tube and welding the sealing tube to the glass tube. It is said.

The glass tube side protrusion may be located on the outer peripheral side of the coil portion.
Further, when viewed in the axial direction of the coil portion from the other end component side, the other end portion and the glass tube side protrusion are less than 180 ° in the circumferential direction of the coil portion. When the glass tube side protrusion and the other end component are moved closer to each other in the circumferential direction, the diameter of the coil portion may be increased .
Furthermore, the tip of the glass tube side protrusion may be located closer to the glass tube than the end of the coil portion on the electrode side.

  The other end portion constituting portion may constitute an electrode side protruding portion that protrudes from an end portion on the electrode side of the coil portion.

  Moreover, you may comprise the other said edge part structure part by the edge part by the side of the said electrode of the said coil part.

In another aspect of the method for producing a discharge lamp, the present invention provides an electrode located in the arc tube of a glass discharge vessel, an electrode rod that supports the electrode at one end, and an outer peripheral surface of the electrode rod. A glass tube that is mounted apart from the electrode, a sealing tube that is welded to the outer peripheral surface of the glass tube, forms a part of the discharge vessel and continues to the arc tube, and is mounted on the outer peripheral surface of the electrode rod A coil-shaped stopper made of a metal wire, and the coil-shaped stopper has a glass tube side end capable of contacting the electrode-side end surface of the glass tube and is in a free state. A pair of ends positioned on the electrode side from the glass tube side end portions, each of which is constituted by a coil portion constituted by a part of the metal wire and the both ends of the metal wire, which have a smaller diameter or the same diameter as the electrode rod. A discharge laser having a component part A step of forming the coil portion as a single-winding structure, in a diameter increasing direction until the coil portion in a free state having a smaller diameter or the same diameter as the electrode rod is larger than the electrode rod. An insertion step of inserting the electrode rod into the coil portion in a state of being elastically deformed, the glass tube side end portion is brought into contact with the electrode side end surface of the glass tube, and the coil portion is generated. A mounting step for bringing the inner surface of the coil portion into close contact with the outer peripheral surface of the electrode rod by elastic force in the diameter reducing direction, and covering the outer peripheral surface of the glass tube with the sealing tube. A welding step for welding.

  The coiled stopper may be made of a metal containing any one of tungsten, tantalum, molybdenum, and niobium.

  The coiled stopper of the present invention has a glass tube side end portion that abuts on the electrode side end surface of the glass tube, and has a coil portion having a smaller diameter or the same diameter as the electrode rod in a free state. Therefore, if the electrode rod is inserted into the coil portion while elastically deforming the coil portion in the diameter increasing direction until it has a larger diameter than the electrode rod, the electrode rod can be smoothly inserted into the coil portion. And in the state where the glass tube side end is in contact with the electrode side end surface of the glass tube, the inner surface of the coil portion is brought into close contact with the outer peripheral surface of the electrode rod by the elastic force in the reduced diameter direction generated by the coil portion. The coiled stopper can be securely attached to the electrode rod.

  Furthermore, not the end face of the metal wire constituting the coil-shaped stopper (end face of the end portion constituting portion) but the end portion on the glass tube side of the coil portion is in contact with the end face on the electrode side of the glass tube. If the end surface of the metal wire is in contact with the end surface of the glass tube, the end surface of the metal wire and the end surface of the glass tube are in a point contact state, so the end surface of the metal wire (coiled stopper) is likely to damage the end surface of the glass tube. (The glass tube is likely to crack). However, in the present invention, the glass tube side end formed in the coil portion is brought into contact with the end surface on the electrode side of the glass tube in a surface contact state, so that the end face of the glass tube is less likely to be damaged by the coiled stopper.

It is a vertical side view of the discharge lamp of one embodiment to which the present invention is applied. It is a vertical side view of the anode side mounting unit which abbreviate | omitted the anode. It is a figure which shows the isolation | separation state of an internal electrode stick | rod and a coil-shaped stopper, (a) is a side view, (b) is the figure which looked at (a) in the arrow direction. It is a figure which shows the state which attached a part of coil-shaped stopper to the internal electrode rod, (a) is a side view, (b) is the figure which looked at (a) in the arrow direction of FIG. It is a figure which shows the state which attached the coil-shaped stopper to the internal electrode rod, (a) is a side view, (b) is the figure which looked at (a) in the arrow line direction of FIG. It is a side view of the coil-shaped stopper of a 1st modification. It is a side view of the coil-shaped stopper of a 2nd modification. It is a side view of the coil-shaped stopper of a 3rd modification. It is a side view of the coil-shaped stopper of a 4th modification. It is a side view of the coil-shaped stopper of a 5th modification. It is a side view of the coil-shaped stopper of a 6th modification. It is a side view of the coil-shaped stopper of a 7th modification. It is a front view of the coil-shaped stopper of a 7th modification. It is a side view of the coil-shaped stopper of an 8th modification. It is a side view of the coil-shaped stopper of a 9th modification. It is a side view of the coil-shaped stopper of a 10th modification.

Hereinafter, a discharge lamp 10 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 5.
The discharge lamp 10 of the present embodiment includes a discharge vessel 11, an anode side mount unit 15, and a cathode side mount unit 50 as major components.
The glass discharge vessel 11 is formed by integrating an arc tube 12 having a substantially spherical shape and a pair of sealing tubes 13 and 14 that are respectively connected to a pair of circular holes formed in the arc tube 12 and are coaxial with each other. It has.

The anode side mount unit 15 includes an anode 16 (electrode), an internal electrode rod 17 (electrode rod), an external electrode rod 19, an internal glass tube 21 (glass tube), an external glass tube 25, an internal metal ring 28, and an external metal ring 31. The glass rod 34, the metal foil 38, and the coiled stopper 40 are combined.
The linearly extending internal electrode rod 17 and external electrode rod 19 are both cylindrical members made of metal. The anode 16 can be supported in a fixed state at one end of the internal electrode rod 17.
Both the inner glass tube 21 and the outer glass tube 25 are rotationally symmetric bodies around their central axes. The inner glass tube 21 and the outer glass tube 25 have the same outer diameter, and the outer diameters of both are slightly smaller than the inner diameters of the sealing tube 13 and the sealing tube 14. The axial dimension of the inner glass tube 21 is longer than that of the outer glass tube 25. A fitting hole 22 and a fitting hole 26 extending along the center axis of the inner glass tube 21 and the outer glass tube 25 are formed in the central portions of the inner glass tube 21 and the outer glass tube 25, respectively. Both end surfaces of the inner glass tube 21 and the outer glass tube 25 are planes orthogonal to the central axis of the both. A recess 23 is formed on one end face of the internal glass tube 21.
The inner metal ring 28 and the outer metal ring 31 are rotationally symmetric bodies around their central axes. The inner metal ring 28 and the outer metal ring 31 have the same specifications, and both the outer diameters thereof are substantially the same as those of the inner glass tube 21 and the outer glass tube 25. Both end surfaces of the inner metal ring 28 and the outer metal ring 31 are planes orthogonal to the center axis of the inner metal ring 28 and the outer metal ring 31, and through holes 29 and 32 are formed in the central portions of the inner metal ring 28 and the outer metal ring 31, respectively. It is.
The glass rod 34 is a rotationally symmetric body around its own central axis, and the outer diameter thereof is the same as that of the inner metal ring 28 and the outer metal ring 31. An electrode support hole 35 and an electrode support hole 36 extending along the center axis of the glass rod 34 are coaxially formed at the center of both end faces of the glass rod 34. Both end surfaces of the glass rod 34 are planes orthogonal to the central axis of the glass rod 34.
The metal foil 38 is an extremely thin strip member, and the anode side mount unit 15 includes a plurality of metal foils 38.

The coiled stopper 40 is a member obtained by processing a single metal wire containing at least one of tantalum, niobium, tungsten, and molybdenum. If the coiled stopper 40 is made of a material containing tantalum or niobium, it can have an effect as a getter for oxygen, hydrogen, and the like. Further, if the material is made of a material containing tungsten or molybdenum, the strength of the coil-shaped stopper 40 is increased (as a result, the pressing force against the internal glass tube 21 described later is increased), and the coil-shaped stopper 40 is missing during the manufacture of the discharge lamp 10. The risk of breakage is reduced.
The coil-shaped stopper 40 includes a coil part 41 spirally wound in one direction with a portion excluding both ends of the metal wire rod, and electrode-side protrusions 43 (end component portions) respectively constituted by the both ends of the metal wire rod. ) And a glass tube side protrusion 44 (end portion constituent portion). The coil portion 41 is single-wound, and the inner diameter of the coil portion 41 when in the free state is slightly smaller than or equal to the outer diameter of the internal electrode rod 17. At this time, the wire diameter and the inner diameter of the coiled stopper 40 take into account the expansion due to the temperature of the internal electrode rod 17 and the coiled stopper 40 so that the coiled stopper 40 does not move unintentionally while the discharge lamp 10 is lit. And determined. However, the coil portion 41 can be elastically deformed from the free state in the diameter increasing direction, and the inner diameter thereof becomes larger than the outer diameter of the internal electrode rod 17 by elastic deformation in the diameter expanding direction. In addition, since the coil portion 41 is tightly wound, adjacent spiral portions constituting the coil portion 41 are in contact with each other when in the free state. One end portion (end surface) in the longitudinal direction of the coil portion 41 forms a glass tube side end portion 42. The electrode side protrusion 43 extends linearly from one end of the coil portion 41 toward the side opposite to the glass tube side end 42. On the other hand, the glass tube side protrusion 44 located on the outer peripheral side of the coil portion 41 is directed in the same direction as the electrode side protrusion 43 from the other end portion (end portion on the glass tube side end portion 42 side) of the coil portion 41. It extends in a straight line.

  On the other hand, the cathode side mount unit 50 includes an internal electrode rod 17, an external electrode rod 19, an internal glass tube 21, an external glass tube 25, an internal metal ring 28, an external metal ring 31, a glass rod 34, a metal foil 38, and a coiled stopper. 40 and a cathode 51 (electrode). The cathode side mount unit 50 has the same configuration as the anode side mount unit 15 except that the cathode 51 is supported in a fixed state on one end of the internal electrode rod 17.

Then, the assembly procedure of the discharge lamp 10 having the above components will be described.
First, the anode side mount unit 15 and the cathode side mount unit 50 are respectively assembled according to the following procedures.
When assembling the anode side mount unit 15, first, the internal electrode rod 17 is inserted into the through hole 29 of the internal metal ring 28, and the internal metal ring 28 is welded to the internal electrode rod 17 at an intermediate position of the internal electrode rod 17. To fix. Further, one end portion of the internal electrode rod 17 is inserted into the fitting hole 22 of the internal glass tube 21 to eliminate a gap between the end surface opposite to the concave portion 23 of the internal glass tube 21 and the end surface of the internal metal ring 28. . Next, while holding the coil portion 41 of the coiled stopper 40 with one hand, and holding the glass tube side protrusion 44 positioned on the outer peripheral side of the coil portion 41 with the other hand, the glass tube side protrusion 44. Is pulled in a direction away from the electrode-side protrusion 43 (in the circumferential direction from the electrode-side protrusion 43 when viewed in the axial direction of the coil part 41), thereby the glass tube side end of the coil part 41 in a free state The end portion on the 42 side is elastically deformed in the diameter increasing direction so that the inner diameter of the end portion on the glass tube side end portion 42 side of the coil portion 41 is made larger than the outer diameter of the internal electrode rod 17. Then, one end portion of the internal electrode rod 17 is inserted into the end portion of the coil portion 41 on the glass tube side end portion 42 side (see FIG. 4). When one end portion of the internal electrode rod 17 is further inserted into the coil portion 41, a portion of the coil portion 41 that is located closer to the electrode-side protrusion 43 side than the end portion on the glass tube side end portion 42 side is the internal electrode rod 17. As a result, the internal electrode rod 17 penetrates the coil portion 41. When the glass tube side end portion 42 of the coil portion 41 is in surface contact with the bottom surface of the recess 23, the hand is released from the glass tube side protrusion 44 and the external force applied to the coil portion 41 through the glass tube side protrusion 44 is applied. Disappear (see FIG. 5). Then, the end of the coil portion 41 on the glass tube side end portion 42 side is elastically restored in the direction of diameter reduction, so that the entire inner surface of the coil portion 41 is in close contact with the outer surface of the internal electrode rod 17. At this time, since the coil portion 41 has a larger diameter than the free state, the coil portion 41 generates an elastic force in the direction of diameter reduction. Therefore, the coil portion 41 (coiled stopper 40) is positioned with respect to the internal electrode rod 17, and the glass tube side end portion 42 is held in contact with the bottom surface of the recess 23. Therefore, the surface contact state between the inner glass tube 21 and the inner metal ring 28 is maintained.
When the coiled stopper 40 is attached to the internal electrode rod 17, the anode 16 is fixedly attached to the end of the internal electrode rod 17.
In this way, in parallel (or back and forth), the external electrode rod 19 is assembled from the anode 16, the internal electrode rod 17, the internal glass tube 21, the internal metal ring 28, and the coiled stopper 40. Then, an integrated body composed of the outer glass tube 25 and the outer metal ring 31 is assembled. That is, the external electrode rod 19 is inserted into the through hole 32 of the external metal ring 31, and the external metal ring 31 is fixed to the external electrode rod 19 by welding at an intermediate position of the external electrode rod 19. One end portion of the outer glass tube 25 is inserted into the fitting hole 26 of the outer glass tube 25, and one end surface of the outer glass tube 25 is brought into surface contact with the end surface of the outer metal ring 31.

Subsequently, the end of the internal electrode rod 17 opposite to the coiled stopper 40 is fitted into the electrode support hole 35 of the glass rod 34 in a fixed state, and the end surface of the internal metal ring 28 opposite to the internal glass tube 21 is fitted. The end surface of the glass rod 34 is brought into surface contact. Further, the end of the external electrode rod 19 opposite to the external glass tube 25 is fitted into the electrode support hole 36 of the glass rod 34 in a fixed state, and the end surface of the external metal ring 31 opposite to the external glass tube 25 is connected to the glass rod. The end face of 34 is brought into surface contact.
Subsequently, after extending a plurality of metal foils 38 in a direction parallel to the internal electrode rod 17 and the external electrode rod 19, each metal foil 38 is brought into contact with the outer peripheral surface of the glass rod 34. At this time, the circumferential intervals of the metal foils 38 are set at equal angular intervals, and the outer peripheral surface of the glass rod 34 is exposed from the gap formed between the adjacent metal foils 38. Further, both end portions in the longitudinal direction of each metal foil 38 are brought into contact with the outer peripheral surfaces of the inner metal ring 28 and the outer metal ring 31, respectively, and both end portions of each metal foil 38 are brought into contact with the outer peripheral surfaces of the inner metal ring 28 and the outer metal ring 31. Weld each.
When the anode side mount unit 15 is assembled in this way, the internal electrode rod 17 and the external electrode rod 19 can be electrically connected via the internal metal ring 28, the external metal ring 31, and the respective metal foils 38.
On the other hand, the cathode side mount unit 50 can be assembled in the same manner as the anode side mount unit 15 except that the cathode 51 is attached to the end of the internal electrode rod 17 instead of the anode 16.

Next, as shown in FIG. 1, the anode side mounting unit 15 is inserted into the sealing tube 13 from the opening end opposite to the arc tube 12, and the anode 16 is positioned in the arc tube 12. Similarly, the cathode side mount unit 50 is inserted into the sealing tube 14 from the opening end opposite to the arc tube 12, and the cathode 51 is positioned in the arc tube 12.
Then, the inside of the discharge vessel 11 is decompressed using a through hole (not shown) formed in the arc tube 12, and the outer peripheral surface is heated by a burner or the like while rotating the sealing tube 13 and the sealing tube 14 in this reduced pressure state. To do. Then, the sealing tube 13 and the sealing tube 14 are welded to the outer peripheral surface of the inner glass tube 21, the outer glass tube 25, and the glass rod 34 (a portion exposed from between adjacent metal foils 38) while reducing the diameter. When the sealing tube 13 and the sealing tube 14 are welded to the outer peripheral surfaces of the inner glass tube 21, the outer glass tube 25, and the glass rod 34 while reducing the diameter, the coiled stopper 40 (glass tube 40) as described above. The side end 42) maintains a gap between the inner glass tube 21 and the inner metal ring 28.
Finally, the air in the discharge vessel 11 is extracted using the through hole of the arc tube 12, and mercury, a rare gas, or the like is injected into the discharge vessel 11, and the through hole is closed after the injection.

  The external electrode rod 19 of the anode side mount unit 15 and the external electrode rod 19 of the cathode side mount unit 50 of the discharge lamp 10 assembled in this way are connected to a power source (illustrated) via a connection cable, an ON / OFF control switch, or the like. (Omitted) Anode and cathode are respectively connected. By switching the ON / OFF control switch to the ON state and applying a voltage that causes dielectric breakdown between the anode 16 and the cathode 51, discharge is generated and the discharge lamp 10 is turned on, and the ON / OFF control switch is switched to the OFF state. Then, the discharge lamp 10 is turned off.

Since the discharge lamp 10 of the present embodiment described above has a single structure and the coil portion 41 that is easily elastically deformed is elastically deformed while the coiled stopper 40 is attached to the internal electrode rod 17, The mounting operation to the electrode rod 17 is easy. Moreover, since the coil portion 41 of the coiled stopper 40 generates an elastic force in the direction of tight contact with the internal electrode rod 17 when mounted on the internal electrode rod 17, the coiled stopper 40 can be securely mounted to the internal electrode rod 17. It is.
Furthermore, when the glass tube side protrusion 44 is pulled and the coil portion 41 is elastically deformed again in the diameter increasing direction until it has a larger diameter than the internal electrode rod 17, the coil portion 41 is slidable with respect to the internal electrode rod 17. Thus, the position of the coiled stopper 40 relative to the internal electrode rod 17 can be easily readjusted.

  Furthermore, the glass tube side end portion 42 of the coil portion 41 is not the inner glass instead of the end surfaces of the electrode side protrusion 43 and the glass tube side protrusion 44 of the coiled stopper 40 (the end surface of the metal wire constituting the coiled stopper 40). Since the end surface of the tube 21 (the bottom surface of the recess 23) is brought into surface contact, the possibility that the end surface of the inner glass tube 21 is damaged by the coiled stopper 40 is small. Furthermore, since the glass tube side end portion 42 of the coil portion 41 is brought into surface contact with the end surface of the internal glass tube 21 (the bottom surface of the recess 23), the coiled stopper 40 (glass tube side end portion 42) is connected to the internal glass tube 21. Since the pressing force is large, the surface contact state between the inner glass tube 21 and the inner metal ring 28 can be reliably maintained.

Further, although the tip of the glass tube side protrusion 44 faces the outer peripheral surface of the internal electrode rod 17, the tip of the glass tube side protrusion 44 is spaced from the outer peripheral surface of the internal electrode rod 17 to the outer peripheral side. The tip of the glass tube side protrusion 44 does not damage the surface of the internal electrode rod 17. Therefore, the shavings generated from the surface of the internal electrode rod 17 remain in the arc tube 12, and the shavings evaporate during lighting and adhere to the inner wall of the arc tube 12, thereby blackening the arc tube 12. It is not.
Further, since the coil portion 41 has a single structure, the manufacturing cost of the coiled stopper 40 can be kept low.

As mentioned above, although this invention was demonstrated using the said embodiment, this invention can be implemented, giving various deformation | transformation.
For example, the coiled stopper may be implemented in the manner shown in FIGS.
The coil-like stopper 55 shown in FIG. 6 has a shorter electrode-side protrusion 43 and glass tube-side protrusion 44 than the coil-like stopper 40. Therefore, compared with the coil-shaped stopper 40, the possibility that electric discharge is performed between the anode 16 or the cathode 51 and the electrode side protrusion 43 or the glass tube side protrusion 44 is reduced. If a discharge occurs in this manner, the discharged electrode-side protrusion 43 and glass tube-side protrusion 44 are melted by high heat, and the melted portion adheres to the inner surface of the arc tube 12 and cracks in the arc tube 12. However, according to the present modification, such a risk can be reduced.
The coil-shaped stopper 57 shown in FIG. 7 includes an end portion on the anode 16 (cathode 51) side of the coil portion 41 by one end portion (end portion constituting portion) of the metal wire constituting the coil-like stopper 40. Therefore, there is no portion corresponding to the electrode side protrusion 43. Therefore, it is less likely that the discharge is performed between the anode 16 and the cathode 51 than the coiled stopper 55 of FIG. Further, the coil-shaped stopper 57 is a portion that can be the glass tube side end portion 42 at both ends in the longitudinal direction of the coil portion 41 (a portion that is in surface contact with the bottom surface of the recess 23 when being brought into contact with the bottom surface of the recess 23. ) Is formed. Therefore, the coiled stopper 57 can be attached not only to the internal electrode rod 17 in such a manner that the glass tube side end portion 42 located on the base end side of the glass tube side protrusion 44 is brought into contact with the bottom surface of the recess 23, but also to the other side. It is also possible to attach the glass tube side end portion 42 to the internal electrode rod 17 in such a manner that the glass tube side end portion 42 abuts against the bottom surface of the recess 23.

Further, the coil-shaped stopper 59 shown in FIG. 8 does not wind the coil portion 41 tightly, and is configured such that adjacent spiral portions constituting the coil portion 41 are separated from each other when in the free state. If it does in this way, since the coil part 41 becomes easier to elastically deform, attachment or detachment to the internal electrode rod 17 of the coil-shaped stopper 59 becomes easier.
Further, since the coil portion 41 does not need to be tightly wound, the coiled stopper 59 can be manufactured at a lower manufacturing cost than the coiled stoppers 40, 55, and 57.

Also, the electrode-side protrusions 43 of the coiled stoppers 61, 63, 65 shown in FIGS. 9 to 11 do not extend from the coil part 41 to the arc tube 12 side but to the base end side of the glass tube-side protrusion 44. It extends towards. However, the tip end of any electrode side protrusion 43 is terminated on the arc tube 12 side from the glass tube side end part 42 located on the base end side of the glass tube side protrusion 44.
Even in this configuration, when the coiled stoppers 61, 63, 65 are attached to the internal electrode rod 17, the glass tube side end portion 42 of the coil portion 41 is the end surface of the internal glass tube 21 (the bottom surface of the recess 23). Therefore, the coiled stoppers 61, 63, 65 reduce the risk of damage to the end surface of the inner glass tube 21, and the pressing force that extends from the coil portion 41 (glass tube side end portion 42) to the inner glass tube 21. Can be increased.
Further, both of the coil-shaped stoppers 63 and 65 are located at both ends in the longitudinal direction of the coil portion 41 so as to be the glass tube side end portion 42 (when being brought into contact with the bottom surface of the recess 23, A surface contact part) is formed. Therefore, the coiled stoppers 63 and 65 can be mounted not only on the internal electrode rod 17 in such a manner that the glass tube side end portion 42 located on the base end side of the glass tube side protrusion 44 contacts the bottom surface of the recess 23, It is also possible to attach the glass tube side end portion 42 located on the base end side of the side protrusion 43 to the internal electrode rod 17 in such a manner that the glass tube side end portion 42 abuts against the bottom surface of the recess 23.
Further, since not only the glass tube side protrusion 44 but also the electrode side protrusion 43 is located on the outer peripheral side of the coil portion 41 (when the electrode side protrusion 43 is attached to the internal electrode rod 17, the surface of the internal electrode rod 17 is Therefore, the coil portion 41 can be elastically deformed using the electrode side protrusion 43 and the glass tube side protrusion 44. For example, the electrode side protrusion 43 and the glass tube side protrusion 44 are gripped by hand, and the electrode side protrusion 43 and the glass tube side protrusion 44 are the same amount (distance) as when only the glass tube side protrusion 44 is pulled. Is pulled in the circumferential direction away from each other (when viewed in the axial direction of the coil portion 41), the amount of elastic deformation of the coil portion 41 is doubled compared to when only the glass tube side protrusion 44 is pulled. Therefore, when the coil part 41 is elastically deformed using the electrode side protrusion 43 and the glass tube side protrusion 44, the mounting work of the coiled stoppers 61, 63, 65 on the internal electrode rod 17 can be performed more efficiently. Is possible.

Further, the coiled stopper 67 shown in FIGS. 12 and 13 is obtained by winding a part of the coil portion 41 twice.
The coil portion 41 of the coiled stopper 67 has a double end winding on the glass tube side end portion 42 side. However, when the coil part 41 is in a free state, the lap winding part 41a (part located on the outer peripheral side) is separated from the inner peripheral part of the coil part 41 to the outer peripheral side (see FIG. 13).
When the coil portion 41 is in a free state, the lap winding portion 41a is separated from the inner peripheral side portion of the coil portion 41 to the outer peripheral side, so that the inner peripheral side portion of the coil portion 41 can be easily prevented without interfering with the lap winding portion 41a. Elastically deformable in the diameter expansion direction.
The coil-shaped stopper 67 having such a configuration has a larger contact area with the end surface of the inner glass tube 21 (the bottom surface of the recess 23) of the glass tube side end portion 42 of the coil portion 41 (overlap portion 41a). It is possible to further increase the pressing force extending from the portion 41 (the glass tube side end portion 42) to the inner glass tube 21.

  A coiled stopper 69 shown in FIG. 14 is a modification in which the overlapping winding portion 41 a is formed in a wider range than the coiled stopper 67.

Further, the coil portion 41 of the coil-shaped stopper 71 shown in FIG. 15 is obtained by triple winding the end portion on the glass tube side end portion 42 side. However, when the coil part 41 is in a free state, the part that is triple-wound (the inner peripheral part located on the innermost peripheral side, the overlapping winding part 41a facing the inner peripheral part, and the outer peripheral side of the overlapping winding part 41a) The overlapping winding portions 41b) are separated from each other.
When the coil part 41 is in a free state, the triple-turned parts are separated from each other, so that the part located on the inner peripheral side of the coil part 41 is easily elastic in the diameter expanding direction without interfering with the lap winding part 41a. It can be deformed.
The coiled stopper 71 having such a configuration is the end face of the inner glass tube 21 at the glass tube side end portion 42 of the coil portion 41 (the overlapped winding portion 41a and the overlapped winding portion 41b) rather than the coiled stopper 67 and the coiled stopper 69. Since the contact area with respect to (the bottom surface of the recess 23) is further increased, it is possible to further increase the pressing force from the coil portion 41 (glass tube side end portion 42) to the inner glass tube 21.

  Although illustration is omitted, a double winding portion or a triple winding portion may be formed over the entire length of the coil portion 41, or the number of turns may be increased more than the triple winding.

  The coil-shaped stopper 73 shown in FIG. 16 is characterized by the circumferential position of the glass tube side protrusion 44 with respect to the electrode side protrusion 43. That is, the electrode-side protrusion 43 and the glass tube-side protrusion 44 are positioned at an angle smaller than 180 ° (a straight line connecting the axis of the coil portion 41 and the electrode-side protrusion 43 when viewed in the axial direction of the coil portion 41. The angle formed by the axis of the coil portion 41 and the straight line connecting the glass tube side protrusion 44 is smaller than 180 °), and the glass tube side protrusion 44 is closer to the electrode side protrusion 43 than the electrode side protrusion 43 is. It is located on the winding direction side of the coil portion 41 toward the glass tube side protrusion 44 side. In this way, for example, the electrode side protrusion 43 and the glass tube side protrusion 44 can be easily grasped with the thumb and index finger of one hand, and the thumb and index finger can be brought closer (the electrode side protrusion 43 and the glass tube side). By bringing the protrusion 44 close to the circumferential direction), the coil portion 41 can be easily elastically deformed in the diameter increasing direction. For example, when the electrode-side protrusion 43 and the glass tube-side protrusion 44 are brought close to each other in this way, the amount of elastic deformation of the coil portion 41 becomes the glass tube-side protrusion 44 as in the modification examples of FIGS. As compared with the case of pulling only the inner electrode rod 17, the mounting work efficiency with respect to the internal electrode rod 17 is good. Furthermore, since it is an aspect which is easy to hold | grip with a jig | tool or a tool, the mounting | wearing operation | work of the coil-shaped stopper 73 can be performed more efficiently by using a jig | tool or a tool.

In addition, when the coiled stoppers 40, 55, 57, 59, 61, 63, 65, 67, 69, 71, 73 are mounted on the internal electrode rod 17, the glass tube side protrusions 44, etc. are pulled so that the free state The coil part 41 is elastically deformed in the diameter-expanding direction until the entire inner diameter of the coil part 41 is larger than the outer diameter of the internal electrode bar 17, and the internal electrode bar 17 is inserted into the coil part 41 in this state. In addition, the external force applied to the glass tube side protrusion 44 and the like is lost, so that the coil portion 41 is elastically restored in the diameter reducing direction, and the coil-shaped stoppers 40, 55, 57, 59, 61, 63, 65, 67 , 69, 71, 73 may be attached to the internal electrode rod 17.
Further, when the inner diameter of the coil portion 41 in the free state is slightly smaller than the outer diameter of the internal electrode rod 17 (for example, when the diameter is about a few millimeters of comma) or the same diameter, the coil portion 41 is in a free state (glass). The end portion of the internal electrode rod 17 can be inserted into the open end portion of the coil portion 41 (in a state where it is not elastically deformed in the diameter-expanding direction using the tube-side protrusion 44 or the like). When the internal electrode rod 17 is inserted in this way, the coil portion 41 is elastically deformed in the diameter-expanding direction by the outer peripheral surface of the internal electrode rod 17, and further, the coil portion 41 is elastically deformed by the elastic force in the diameter-decreasing direction. The entire inner surface is in close contact with the outer surface of the internal electrode rod 17.

Further, the assembly procedure of the discharge lamp 10 is not limited to the above-described procedure. For example, the discharge lamp 10 is integrally formed of the anode 16, the internal electrode rod 17, the internal glass tube 21, the internal metal ring 28, and the coiled stopper 40 (or When assembling the cathode 51, the internal electrode rod 17, the internal glass tube 21, the internal metal ring 28, and the coiled stopper 40), the anode 16 (or the cathode 51) is attached to the internal electrode rod 17. After temporarily attaching the coiled stopper 40 to the internal electrode rod 17 and further attaching the internal glass tube 21 and the internal metal ring 28 to the internal electrode rod 17, the position of the coiled stopper 40 is adjusted and the glass tube side end is adjusted. The portion 42 may be brought into contact with the concave portion 23 of the inner glass tube 21.
Moreover, you may change the internal glass tube 21 into what does not provide the recessed part 23 in the end surface by the side of the anode 16 (cathode 51).
Further, the discharge lamp 10 is not limited to the above-described form, and the present invention can be applied to all discharge lamps including the internal electrode rod 17 inserted into the internal glass tube 21 or the external electrode rod 19 inserted into the external glass tube 25. It is.

DESCRIPTION OF SYMBOLS 10 Discharge lamp 11 Discharge vessel 12 Light emission tube 13 14 Sealing tube 15 Anode side mount unit 16 Anode (electrode)
17 Internal electrode rod (electrode rod)
19 External electrode rod 21 Internal glass tube (glass tube)
22 fitting hole 23 recess 25 outer glass tube 26 fitting hole 28 inner metal ring 29 through hole 31 outer metal ring 32 through hole 34 glass rod 35 36 electrode rod support hole 38 metal foil 40 coiled stopper 41 coil portion 41a 41b overlap Winding part 42 Glass tube side end part 43 Electrode side protrusion (end part constituent part)
44 Glass tube side protrusion (end component)
50 Cathode side mount unit 51 Cathode (electrode)
55 Coiled stopper 57 Coiled stopper 59 Coiled stopper 61 Coiled stopper 63 Coiled stopper 65 Coiled stopper 67 Coiled stopper 69 Coiled stopper 71 Coiled stopper 73 Coiled stopper 73

Claims (16)

An electrode located within the arc tube of a glass discharge vessel;
An electrode rod that supports the electrode at one end;
A glass tube mounted on the outer peripheral surface of the electrode rod, spaced apart from the electrode;
A sealed tube which is welded to the outer peripheral surface of the glass tube and forms a part of the discharge vessel and is continuous with the arc tube;
A coiled stopper made of a metal wire, attached to the outer peripheral surface of the electrode rod;
With
The coiled stopper
The glass tube has an end on the glass tube side that is in contact with the end surface on the electrode side of the glass tube, and the inner surface of the glass tube is elastically deformed from a free state having a smaller diameter or the same diameter as the electrode rod in the diameter increasing direction. A coil portion constituted by a part of the metal wire, which is in close contact with the outer peripheral surface of the rod;
A pair of end parts configured by the both ends of the metal wire, respectively, located on the electrode side from the end part on the glass tube side,
Bei to give a,
A pair of one of said end configuration portion, a discharge lamp which is characterized that you configure the glass tube side projections projecting to the electrode side from the glass tube end. The discharge lamp according to claim 1 , wherein
A discharge lamp in which the glass tube side protrusion is located on the outer peripheral side of the coil portion. The discharge lamp according to claim 2 , wherein
When viewed from the other end component side in the axial direction of the coil part, the other end component part and the glass tube side protrusion are positioned at an angle smaller than 180 ° in the circumferential direction of the coil part. A discharge lamp arranged so that the diameter of the coil portion is increased when the glass tube side protrusion and the other end component are moved closer to each other in the circumferential direction . The discharge lamp according to any one of claims 1 to 3 ,
A discharge lamp in which a tip of the glass tube side protrusion is positioned closer to the glass tube than an end of the coil portion on the electrode side. The discharge lamp according to any one of claims 1 to 4 ,
The discharge lamp in which the other end portion constituting part constitutes an electrode side protrusion protruding from the electrode side end of the coil part. The discharge lamp according to any one of claims 1 to 4 ,
The discharge lamp which comprised the other said edge part structure part by the edge part by the side of the said electrode of the said coil part. An electrode located within the arc tube of a glass discharge vessel;
An electrode rod that supports the electrode at one end;
A glass tube mounted on the outer peripheral surface of the electrode rod, spaced apart from the electrode;
A sealed tube which is welded to the outer peripheral surface of the glass tube and forms a part of the discharge vessel and is continuous with the arc tube;
A coiled stopper made of a metal wire, attached to the outer peripheral surface of the electrode rod;
With
The coiled stopper
The glass tube has an end on the glass tube side that is in contact with the end surface on the electrode side of the glass tube, and the inner surface of the glass tube is elastically deformed from a free state having a smaller diameter or the same diameter as the electrode rod in the diameter increasing direction. A coil portion constituted by a part of the metal wire, which is in close contact with the outer peripheral surface of the rod;
A pair of end parts configured by the both ends of the metal wire, respectively, located on the electrode side from the end part on the glass tube side,
With
A discharge lamp characterized in that the coil part has a single-winding structure. The discharge lamp according to any one of claims 1 to 7 ,
A discharge lamp in which the coiled stopper is made of a metal containing any one of tungsten, tantalum, molybdenum, and niobium. An electrode located within the arc tube of a glass discharge vessel;
An electrode rod that supports the electrode at one end;
A glass tube mounted on the outer peripheral surface of the electrode rod, spaced apart from the electrode;
A sealed tube which is welded to the outer peripheral surface of the glass tube and forms a part of the discharge vessel and is continuous with the arc tube;
A coiled stopper made of a metal wire, attached to the outer peripheral surface of the electrode rod;
With
The coiled stopper
Consists of a part of the metal wire having a glass tube side end capable of contacting the electrode side end surface of the glass tube and having a smaller diameter or the same diameter as the electrode rod when in a free state. Coil part,
A pair of end parts configured by the both ends of the metal wire, respectively, located on the electrode side from the end part on the glass tube side,
I have a,
One of the pair of end portion constituting portions is a method for manufacturing a discharge lamp constituting a glass tube side protruding portion protruding from the glass tube side end portion to the electrode side ,
The coil portion on the small diameter or same diameter free state than the electrode rod, while being elastically deformed in the diameter direction until the diameter larger than the electrode rod while grasping the glass tube side projections, the coil unit An insertion step of inserting the electrode rod into,
The glass tube side end is brought into contact with the electrode side end surface of the glass tube, and the inner surface of the coil portion is brought into close contact with the outer peripheral surface of the electrode rod by the elastic force generated in the reduced diameter direction generated by the coil portion. Mounting step,
as well as,
A welding step of covering the outer peripheral surface of the glass tube with the sealing tube, and welding the sealing tube to the glass tube;
A method for producing a discharge lamp, comprising: In the manufacturing method of the discharge lamp of Claim 9 ,
A method for manufacturing a discharge lamp, wherein the glass tube side protrusion is located on an outer peripheral side of the coil portion. The discharge lamp according to claim 10 , wherein
When viewed from the other end component side in the axial direction of the coil part, the other end component part and the glass tube side protrusion are positioned at an angle smaller than 180 ° in the circumferential direction of the coil part. A method for manufacturing a discharge lamp that is displaced and arranged so that the diameter of the coil portion is enlarged when the glass tube side protrusion and the other end component are moved closer to each other in the circumferential direction. . In the manufacturing method of the discharge lamp of any one of Claim 9 to 11 ,
A discharge lamp manufacturing method in which a tip of the glass tube side protrusion is positioned closer to the glass tube than an end of the coil portion on the electrode side. In the manufacturing method of the discharge lamp of any one of Claim 9 to 12 ,
The manufacturing method of the discharge lamp in which the other end portion constituting portion constitutes an electrode side protruding portion protruding from the electrode side end portion of the coil portion. In the manufacturing method of the discharge lamp of any one of Claim 9 to 12 ,
A method for manufacturing a discharge lamp, wherein the other end portion constituting portion is constituted by an end portion on the electrode side of the coil portion. An electrode located within the arc tube of a glass discharge vessel;
  An electrode rod that supports the electrode at one end;
  A glass tube mounted on the outer peripheral surface of the electrode rod, spaced apart from the electrode;
  A sealed tube which is welded to the outer peripheral surface of the glass tube and forms a part of the discharge vessel and is continuous with the arc tube;
  A coiled stopper made of a metal wire, attached to the outer peripheral surface of the electrode rod;
  With
  The coiled stopper
  Consists of a part of the metal wire having a glass tube side end capable of contacting the electrode side end surface of the glass tube and having a smaller diameter or the same diameter as the electrode rod when in a free state. Coil part,
  A pair of end parts configured by the both ends of the metal wire, respectively, located on the electrode side from the end part on the glass tube side,
A method of manufacturing a discharge lamp having
  Forming the coil part as a single winding structure;
  Insertion step of inserting the electrode rod into the coil portion in a state where the coil portion in a free state having a smaller diameter or the same diameter as the electrode rod is elastically deformed in a diameter increasing direction until it becomes larger in diameter than the electrode rod. ,
  The glass tube side end is brought into contact with the electrode side end surface of the glass tube, and the inner surface of the coil portion is brought into close contact with the outer peripheral surface of the electrode rod by the elastic force generated in the reduced diameter direction generated by the coil portion. Mounting step,
as well as,
  A welding step of covering the outer peripheral surface of the glass tube with the sealing tube, and welding the sealing tube to the glass tube;
  A method for producing a discharge lamp, comprising: In the manufacturing method of the discharge lamp of any one of Claim 9 to 15 ,
A method for manufacturing a discharge lamp, wherein the coiled stopper is made of a metal containing any one of tungsten, tantalum, molybdenum, and niobium.

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