KR20150059737A

KR20150059737A - Discharge lamp and method for producing discharge lamp

Info

Publication number: KR20150059737A
Application number: KR1020157004196A
Authority: KR
Inventors: 다케히로 하야시
Original assignee: 가부시키가이샤 오크세이사쿠쇼
Priority date: 2012-09-25
Filing date: 2013-07-08
Publication date: 2015-06-02
Also published as: TWI590296B; JP2014067516A; CN104584187B; JP6103868B2; CN104584187A; WO2014050253A1; TW201413776A; KR101967021B1

Abstract

A discharge lamp capable of easily and reliably mounting a coil-shaped stopper for restricting the sliding of the glass tube to the electrode side with respect to the electrode during the welding operation of the sealing tube to the glass tube, and a method of manufacturing the discharge lamp. The solving means includes a coil-shaped stopper 40 and a glass observation side end portion 42 which is in contact with the glass tube 21. The glass-like stopper 40 has elasticity in a diametrical direction from a free state smaller than the electrode rod 17, A coil section 41 constituted by a part of the metal wire material whose inner surface is in contact with the outer circumferential surface of the electrode rod in a deformed state and a pair of end portions And constituent parts 43 and 44, respectively.

Description

DISCHARGE LAMP AND METHOD FOR PRODUCING DISCHARGE LAMP BACKGROUND OF THE INVENTION 1. Field of the Invention [0001]

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

Patent Document 1 discloses a conventional example of a discharge lamp.

The discharge lamp includes an electrode (negative electrode or positive electrode) positioned in a discharge vessel made of glass, an electrode rod (electrode rod) for supporting the electrode at one end thereof, and a glass tube And a sealing tube (side tube) which is welded to the outer circumferential surface of the glass tube and constitutes a part of the discharge vessel and has one end connected to the arc tube. Although there is no clear disclosure in Patent Document 1, a metal ring located on the opposite side of the electrode with a glass tube therebetween is usually mounted on the circumferential surface of the electrode.

When the sealing tube is welded to the outer circumferential surface of the glass tube, the sealing tube is rotated together with the glass tube so as to uniformly heat the sealing tube as a whole. Then, since the glass tube moves in the axial direction with the rotation of the sealing tube, a gap is likely to be formed on the opposite surface between the glass tube and the metal ring. If the sealing tube is welded to the glass tube with a gap formed between the glass tube and the metal ring, cracks are generated in the portion of the sealing tube facing the gap when the inside of the discharge vessel becomes high during the lighting of the discharge lamp There is a risk that the discharge vessel is damaged due to this crack.

However, the discharge lamp of Patent Document 1 has a coil member for solving this problem.

In the coil member of Patent Document 1, the tungsten wire is double wound around the electrode bar, and the electrode side end portion is separated from the electrode. On the other hand, since the glass tube end of the coil member is in contact with the end surface of the glass tube, the glass tube restricts sliding of the electrode tube on the electrode side, so that there is no gap between the glass tube and the metal ring.

Therefore, even when the sealing tube is rotated when the sealing tube is welded to the outer peripheral surface of the glass tube, a gap is not easily formed on the opposite surface between the glass tube and the metal ring.

Japanese Patent No. 3562271 Japanese Patent Application Laid-Open No. 2009-231002 Japanese Patent No. 4963821

However, the coil member of Patent Document 1 does not form a coil shape before being attached to an electrode rod, but turns into a coil shape only when it is wound around an electrode rod. That is, since the tungsten wire is tightly wound around the electrode rod while being plastic-deformed, the mounting work of the coil member to the electrode rod is very troublesome. Particularly, in the case of forming a concave portion (see, for example, a concave portion formed on the end face of the electrode-side glass tube in Patent Document 2) receiving the end of the coil member at the end face of the glass tube, the mounting work becomes extremely difficult.

In addition, it is also a drawback that it is very cumbersome to adjust the position of the coil member with respect to the electrode after temporarily winding the coil member against the electrode.

The present invention relates to a discharge lamp capable of easily and reliably mounting a coil-shaped stopper for restricting the sliding of a glass tube to an electrode side relative to an electrode rod during a welding operation of an encapsulation tube to a glass tube, and a method of manufacturing a discharge lamp .

The discharge lamp of the present invention comprises an electrode positioned in an arc tube of a discharge vessel made of glass, an electrode rod supporting the electrode at one end thereof, a glass tube mounted on an outer circumferential surface of the electrode at a distance from the electrode, And a coil-shaped stopper made of a metal wire and mounted on an outer circumferential surface of the electrode rod, the coil-shaped stopper being a part of the discharge vessel and being continuous with the arc tube, Wherein an inner surface of the electrode is in close contact with the outer circumferential surface of the electrode while being elastically deformed in a diameter direction from a free state having a smaller diameter or an equal diameter than the electrode, A coil portion constituted by a part of the metal wire and a coil portion constituted by both ends of the metal wire, It is characterized by comprising a configuration of a pair of end portions positioned on the electrode side.

The one end portion of the end portion constituting portion may constitute a glass-projection protruding portion protruding toward the electrode side from the glass-tube-side end portion.

In this case, the glass-projection protruding portion may be located on the outer peripheral side of the coil portion.

When viewed in the axial direction of the coil part from the other end constituent part side, the other end constituent part and the glass observing protruding part are displaced at an angle smaller than 180 占 in the circumferential direction of the coil part, The projecting portion may be positioned on the winding direction side of the coil portion facing the glass-tube side projecting portion on the side of the end portion constituent portion than the end constituent portion on the other side.

The distal end of the glass-observing projection may be positioned closer to the glass tube than the end of the coil portion on the electrode side.

And the other end portion constituting portion may constitute an electrode side projection portion protruding from an end of the coil portion on the electrode side.

The end portion of the other end may be formed by the end of the coil portion on the electrode side.

The coil portion may have a single winding structure.

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

A method of manufacturing a discharge lamp according to the present invention is a method of manufacturing a discharge lamp comprising the steps of: forming an electrode in an arc tube of a discharge vessel made of glass; an electrode rod supporting the electrode at one end thereof; a glass tube mounted on an outer circumferential surface of the electrode, And a coil-shaped stopper made of a metal wire and mounted on an outer circumferential surface of the electrode rod, the coil-shaped stopper being part of the discharge vessel and fused to the outer circumferential surface of the glass tube, the seal tube being continuous with the arc tube, A coil part having a glass tube side end portion capable of being in contact with an end surface of the glass tube at the electrode side and having a diameter smaller than or equal to the diameter of the electrode rod when in a free state, And a discharge lamp having a pair of end constituent parts located on the electrode side with respect to the glass observation side end part, An inserting step of inserting the electrode rod into the coil part while elastically deforming the coil part in a free state having a diameter smaller than or equal to the diameter of the electrode rod to a diametrical direction until the electrode part becomes larger in diameter than the electrode rod; A mounting step of bringing the glass observation end into contact with the end surface of the glass tube at the electrode side and bringing the inner surface of the coil portion into close contact with the outer circumferential surface of the electrode rod by the elastic force in the radial direction of the axis, And a welding step of covering the sealing tube and welding the sealing tube to the glass tube.

Wherein the one end of the end portion constitutes a glass bulb projection protruding from the glass bulb side end portion toward the electrode side while the insertion step elastically deforms the corresponding coil portion in the direction of the bulging direction while holding the glass bulb side projection, And inserting the electrode into the coil part.

And the glass observing projection may be located on the outer peripheral side of the coil portion.

In this case, when viewed in the axial direction of the coil part from the other end constituent part side, the other end constituent part and the glass obturator projected part are displaced at an angle smaller than 180 degrees in the circumferential direction of the coil part, The glass-observing projection may be located on the side of the end portion of the other end in the winding direction of the coil portion facing the glass-column side projecting portion.

Further, the tip of the glass-observing projection may be located on the glass surface side of the end portion of the coil portion on the electrode side.

The coil portion may have a single winding structure.

The coil-shaped stopper according to the present invention has a glass-made end portion contacting the end face of the electrode of the glass tube, and has a coil portion of a smaller diameter or the same diameter than the electrode rod in the free state. Therefore, when the electrode rod is inserted into the coil portion while elastically deforming the coil portion in the direction of the diameter until the diameter becomes larger than the electrode rod, insertion of the electrode rod into the coil portion can be smoothly performed. The inner surface of the coil portion is brought into close contact with the outer circumferential surface of the electrode rod by the elastic force in the radial direction of the axis in which the coil portion is generated in a state in which the glass observation end portion is in contact with the end surface of the electrode of the glass tube. Do.

Further, not the end face of the metal wire constituting the coil-shaped stopper (the end face of the end constituent part) but the end face of the glass part of the coil part come into contact with the end face of the electrode side of the glass tube. If the end face of the metal wire contacts the end face of the glass tube, the end face of the metal wire is in point contact with the end face of the glass tube, so that the end face of the glass tube is easily damaged by the end face of the metal wire Cracks tend to occur). However, according to the present invention, since the end surface of the glass tube formed on the coil part is in contact with the end surface of the electrode side of the glass tube in a surface contact state, there is little possibility that the end surface of the glass tube is damaged by the coil-

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal side view of a discharge lamp according to an embodiment of the present invention. FIG.
2 is a longitudinal side view of a positive electrode side mount unit in which an anode is omitted.
3 is a view showing a state in which the inner electrode bar and the coil-shaped stopper are separated from each other, wherein (a) is a side view and (b) is a view of FIG.
4 is a view showing a state in which a part of the coil-shaped stopper is mounted on the internal electrode bar, FIG. 4 (a) is a side view, and FIG. 4 (b) is a view seen in the direction of the arrow in FIG.
FIG. 5 is a side view of the inner electrode bar, and FIG. 5 (b) is a view of FIG. 3 (a) taken in the direction of the arrow in FIG.
6 is a side view of the coil-shaped stopper of the first modification;
7 is a side view of the coil-shaped stopper of the second modification.
8 is a side view of a coil-shaped stopper according to a third modification;
9 is a side view of the coil-shaped stopper of the fourth modified example.
10 is a side view of the coil-shaped stopper of the fifth modification.
11 is a side view of the coil-shaped stopper of the sixth modification.
12 is a side view of the coil-shaped stopper of the seventh modification.
13 is a front view of the coil-shaped stopper of the seventh modification.
14 is a side view of the coil-shaped stopper of the eighth modification.
15 is a side view of the coil-shaped stopper of the ninth modification;
16 is a side view of the coil-shaped stopper of the tenth modification;

Hereinafter, a discharge lamp 10 according to an embodiment of the present invention will be described with reference to Figs. 1 to 5. Fig.

The discharge lamp 10 of the present embodiment has a discharge container 11, a positive electrode side mount unit 15 and a negative electrode side mount unit 50 as a large component.

The discharge vessel 11 made of glass has an arc tube 12 having a substantially spherical shape and a pair of seal tubes 12 connected to a pair of circular holes formed in the arc tube 12 and coaxial to each other, (13, 14) are integrally provided.

The anode side mount unit 15 includes an anode 16 (electrode), an internal electrode 17 (electrode rod), an external electrode rod 19, an internal glass tube 21 (glass tube), an external glass tube 25, An outer metal ring 31, a glass rod 34, a metal foil 38, and a coil-shaped stopper 40 are combined.

The internal electrode rod 17 and the external electrode rod 19 which are linearly extended are all cylindrical members made of metal. At one end of the internal electrode 17, the anode 16 can be held in a fixed state.

Both the inner glass tube 21 and the outer glass tube 25 are rotationally symmetric bodies about their own central axes. The outer diameter of the inner glass tube 21 and the outer glass tube 25 are the same and their outer diameters are slightly smaller than the inner diameter of the sealing tube 13 and the sealing tube 14. [ The inner glass tube 21 is longer than the outer glass tube 25 in the axial direction dimension. A fitting hole 22 and a fitting hole 26 extending along the central axis of the inner glass tube 21 and the outer glass tube 25 are respectively formed. Both the end faces of the inner glass tube 21 and the outer glass tube 25 are planes orthogonal to their central axis. A concave portion (23) is formed in one end face of the inner glass tube (21).

The inner metal ring 28 and the outer metal ring 31 are rotationally symmetric about their central axis. The inner metal ring 28 and the outer metal ring 31 have the same specifications and their outer diameters are almost the same as those of the inner glass tube 21 and the outer glass tube 25. [ Both end faces of the inner metal ring 28 and the outer metal ring 31 are planes orthogonal to the central axis of the inner metal ring 28 and the outer metal ring 31. In the center portion of the inner metal ring 28 and the outer metal ring 31, 32 are formed.

The glass rod 34 is a rotationally symmetric body about its central axis and its outer diameter is the same as the inner metal ring 28 and the outer metal ring 31. The electrode support hole 35 and the electrode support hole 36 extending along the central axis of the glass rod 34 are coaxially formed at the center of both end faces of the glass rod 34. Both end faces of the glass rod 34 are planes orthogonal to the central axis of the glass rod 34. [

The metal foil 38 is an ultrathin band member, and the anode side mount unit 15 is provided with a plurality of metal foils 38.

The coil-shaped stopper 40 is a member obtained by processing a single metal wire rod containing at least one of tantalum, niobium, tungsten, and molybdenum. When the coil-shaped stopper 40 is made of a material containing tantalum or niobium, it can have an effect as a getter with respect to oxygen, hydrogen, and the like. When the coil-shaped stopper 40 is made of a material including tungsten or molybdenum, the strength of the coil-shaped stopper 40 is increased (as a result, the pressing pressure against the inner glass tube 21 described later also increases) 10) is reduced or the possibility of breakage is reduced.

The coil-shaped stopper 40 includes a coil portion 41 wound in a spiral shape in one direction except for both ends of the metal wire material, and electrode-side protrusions 43 formed by both ends of the metal wire material And a glass-observing protruding portion 44 (end constituent portion). The inner diameter of the coil portion 41 is slightly smaller than the outer diameter of the inner electrode rod 17 when the coil portion 41 is single-ply and free. At this time, the wire diameter and the inner diameter of the coil-shaped stopper 40 are set such that the inner electrode 17 and the coil-shaped stopper 40 are not in contact with each other so as to prevent the coil-shaped stopper 40 from moving unintentionally during lighting of the discharge lamp 10. [ In consideration of the expansion due to the temperature of the fluid. However, the coil portion 41 can be elastically deformed from the free state to the diametrical direction, and its inner diameter becomes larger than the outer diameter of the inner electrode rod 17 by elastic deformation in the diametrical direction. Since the coil portion 41 is tightly wound, adjacent helical portions constituting the coil portion 41 when in a free state are in contact with each other. One end portion (end surface) in the length direction of the coil portion 41 constitutes a glass-side end portion 42. The electrode side projection portion 43 extends linearly from one end of the coil portion 41 toward the opposite side of the glass tube side end portion 42. On the other hand, the glass-projection protruding portion 44 located on the outer circumferential side of the coil portion 41 extends from the other end (the end on the glass-observing end 42 side) of the coil portion 41 to the electrode- As shown in FIG.

On the other hand, the cathode side mount unit 50 includes an inner electrode rod 17, an outer electrode rod 19, an inner glass tube 21, an outer glass tube 25, an inner metal ring 28, an outer metal ring 31, A rod 34, a metal foil 38, a coil-shaped 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 fixedly attached to one end of the internal electrode rod 17.

Next, the assembling procedure of the discharge lamp 10 having the above-described constituent parts will be described.

First, the positive electrode side mount unit 15 and the negative electrode side mount unit 50 are assembled respectively according to the following procedure.

The inner electrode ring 17 is first inserted into the through hole 29 of the inner metal ring 28 so that the inner metal ring 28 is inserted in the middle position of the inner electrode rod 17 And fixed to the internal electrode rod 17 by welding. One end of the inner electrode rod 17 is inserted into the fitting hole 22 of the inner glass tube 21 so that the end face of the inner glass tube 21 opposite to the recessed portion 23 and the end face of the inner metal ring 28 . Thereafter, the coil portion 41 of the coil-shaped stopper 40 is gripped with one hand while the glass-eye side projection portion 44 located on the outer peripheral side of the coil portion 41 is gripped by the other hand, The observation protruding portion 44 is pulled in the direction away from the electrode side projection portion 43 (in the circumferential direction from the electrode side projection portion 43 when viewed in the axial direction of the coil portion 41) The inner diameter of the end of the coil section 41 on the glass tube side end 42 side is made larger than the outer diameter of the internal electrode rod 17. The end of the coil section 41 on the side of the glass tube end edge 42 is elastically deformed in the diametrical direction. One end of the internal electrode 17 is inserted into the end of the coil section 41 on the glass-facing end 42 side (see Fig. 4). The portion located on the electrode side projection portion 43 side of the end portion of the coil portion 41 on the side of the glass tube side end portion 42 is located inside the inside portion of the internal electrode rod 17, And is elastically deformed by the electrode rod 17 in the direction of diameter enlargement. Finally, the internal electrode rod 17 penetrates the coil part 41. When the glass probe side end portion 42 of the coil portion 41 comes into surface contact with the bottom surface of the recess portion 23, the glass probe side projection portion 44 is released and the coil portion 41 is passed through the glass probe side projection portion 44, (See FIG. 5). Since the end of the coil part 41 on the side of the glass probe side end 42 is resiliently returned in the diametrical direction, the entire inner surface of the coil part 41 comes into close contact with the outer surface of the inner electrode rod 17. At this time, since the coil portion 41 is larger in diameter than the free state, the coil portion 41 generates an elastic force in the diametrical direction. The coil section stopper 40 is positioned with respect to the inner electrode rod 17 and the glass obverse end section 42 is held in contact with the bottom surface of the concave section 23. Thus, the surface contact state of the inner glass tube 21 and the inner metal ring 28 is maintained.

When the coil-shaped stopper 40 is attached to the inner electrode rod 17, the anode 16 is fixedly mounted on the end of the inner electrode rod 17.

In parallel with (or before and after) the assembly of the anode 16, the inner electrode rod 17, the inner glass tube 21, the inner metal ring 28, and the coil-shaped stopper 40, An outer electrode rod 19, an outer glass tube 25, and an outer metal ring 31 are assembled. That is, the outer electrode ring 19 is inserted into the through hole 32 of the outer metal ring 31, and the outer metal ring 31 is welded to the outer electrode ring 19 at an intermediate position of the outer electrode ring 19 And one end of the outer electrode rod 19 is inserted into the fitting hole 26 of the outer glass tube 25 so that one end face of the outer glass tube 25 is in surface contact with the end face of the outer metal ring 31 .

Subsequently, the end of the internal electrode rod 17 opposite to the coil-shaped stopper 40 is fixedly attached to the electrode support hole 35 of the glass rod 34, and the internal glass tube 21 Is brought into surface contact with the end surface of the glass rod (34). The end of the outer electrode bar 19 opposite to the outer glass tube 25 is fixedly attached to the electrode support hole 36 of the glass rod 34 and the outer metal ring 31 is connected to the outer glass tube 25 on the opposite side Is brought into surface contact with the end surface of the glass rod (34).

Subsequently, a plurality of metal foils 38 are extended in a direction parallel to the inner electrode rod 17 and the outer electrode rod 19, and the metal foils 38 are 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 equiangularly spaced to expose the outer circumferential surface of the glass rod 34 from the gaps formed between the adjacent metal foils 38. Both end portions in the longitudinal direction of the metal foil 38 are brought into contact with the outer circumferential surfaces of the inner metal ring 28 and the outer metal ring 31 so that both ends of the metal foil 38 are connected to the inner metal ring 28 and the outer metal ring 31, (31).

When the positive electrode side mount unit 15 is thus assembled, the inner electrode ring 17, the outer electrode ring 19 and the inner metal ring 28 are electrically connected through the metal foil 38 and the metal foil 38 .

The negative electrode side mount unit 50 is assembled in the same manner as the positive electrode side mount unit 15 except that the negative electrode 51 is attached to the end portion of the internal electrode 17 instead of the positive electrode 16. [ It is possible to do.

1, the anode side mount unit 15 is inserted into the sealing tube 13 from the opening end on the side opposite to the arc tube 12. The anode 16 is connected to the arc tube 12, . Likewise, the cathode side mount unit 50 is inserted into the sealing tube 14 from the opening end on the opposite side of the arc tube 12, and the cathode 51 is positioned in the arc tube 12.

The inside of the discharge vessel 11 is depressurized using a through hole (not shown) formed in the arc tube 12. In this reduced pressure state, the sealing tube 13 and the sealing tube 14 are rotated, . The sealing tube 13 and the sealing tube 14 are shrunken and the outer peripheral surface of the inner glass tube 21, the outer glass tube 25 and the glass rod 34 (the portion exposed between the adjacent metal foils 38) . When the sealing tube 13 and the sealing tube 14 are fused together on the outer peripheral surface of the inner glass tube 21, the outer glass tube 25 and the glass rod 34 with a reduced diameter, the coil-shaped stopper 40, (Glass observation end 42) maintains a clearance between the inner glass tube 21 and the inner metal ring 28.

Lastly, mercury or noble gas is injected into the discharge vessel 11 at the same time as the air in the discharge vessel 11 is extracted using the through-hole of the arc tube 12, and the through-hole is closed after the injection.

The connection cable and ON / OFF control switch (not shown) are connected to the external electrode 19 of the anode side mount unit 15 and the external electrode 19 of the cathode side mount unit 50 of the discharge lamp 10 thus assembled The anode and the cathode of the power source (not shown) are respectively connected. The ON / OFF control switch is turned on to apply a voltage for causing an insulation breakdown between the anode 16 and the cathode 51 to cause the discharge lamp 10 to be turned on and the ON / OFF state, the discharge lamp 10 is turned off.

The discharge lamp 10 of the present embodiment described above has the coiled stopper 40 attached to the inner electrode rod 17 while elastically deforming the coiled portion 41 which is single-ply and susceptible to elastic deformation, 40 to the internal electrode rod 17 is easy. The coil-shaped stopper 40 is connected to the inner electrode rod 17 and the inner electrode rod 17 is fixed to the inner electrode rod 17, As shown in Fig.

The coil portion 41 is elastically deformed in the diametrical direction until it becomes larger in diameter than the internal electrode rod 17 by pulling the glass observing projection portion 44 so that the coil portion 41 is slidable with respect to the internal electrode rod 17 State, the position of the coil-shaped stopper 40 relative to the internal electrode rod 17 can be easily readjusted.

The shape of the coil-shaped stopper 40 is not limited to the cross section of the electrode-side projection 43 of the coil-shaped stopper 40 and the cross section of the glass- Since the end portion 42 is in surface contact with the end surface of the inner glass tube 21 (the bottom surface of the concave portion 23), there is little possibility that the end surface of the inner glass tube 21 is damaged by the coil- The glass obverse end portion 42 of the coil portion 41 is in surface contact with the end surface of the inner glass tube 21 (the bottom surface of the concave portion 23) The pushing pressure to the inner glass tube 21 is large, so that the surface contact state of the inner glass tube 21 and the inner metal ring 28 can be reliably maintained.

Since the distal end of the glass-observing protrusion 44 is opposed to the outer circumference of the inner electrode 17 but the distal end of the glass-observing protrusion 44 is separated from the outer circumference of the inner electrode 17 to the outer circumference, The surface of the internal electrode 17 is not damaged by the tip end of the inner electrode 17. Therefore, shavings generated on the surface of the internal electrode 17 are left in the arc tube 12, and the shavings are evaporated during the lighting and adhere to the inner wall of the arc tube 12, 12) is not likely to blacken.

In addition, since the coil portion 41 is of the hop structure, the manufacturing cost of the coil-shaped stopper 40 can be suppressed to a low level.

While the present invention has been described with reference to the above embodiment, the present invention can be carried out while carrying out various modifications.

For example, the coil shape stopper may be embodied in the form shown in Figs. 6 and 7.

The coil-shaped stopper 55 shown in Fig. 6 is shorter than the coil-shaped stopper 40 in that the electrode-side projecting portion 43 and the glass-observing projection portion 44 are short. This reduces the possibility of discharging between the anode 16 or the cathode 51 and the electrode-side protruding portion 43 or the glass-observing protruding portion 44 as compared with the coil-shaped stopper 40. If the discharge occurs, the discharged electrode-side projection 43 and the glass-projection protruding portion 44 are eluted by the high temperature, and the eluted portion is attached to the inner surface of the arc tube 12 or the like, Cracks and the like of the substrate W. However, according to this modification, such a risk can be reduced.

The coil-shaped stopper 57 shown in Fig. 7 has a structure in which the anode 16 (the cathode 51) of the coil part 41 is formed by one end (end constituent part) of the metal wire constituting the coil- And the portion corresponding to the electrode side projection portion 43 does not exist. Therefore, the possibility of discharging between the anode 16 and the cathode 51 is lower than that of the coil-shaped stopper 55 of Fig. The coil-shaped stopper 57 is provided at both ends in the lengthwise direction of the coil part 41 with a portion that can be made of the glass-side end part 42 (when it comes into contact with the bottom surface of the concave part 23, A surface-contacting portion with respect to the surface) is formed. Therefore, the coil-shaped stopper 57 is provided on the inner electrode rod 17 in such a manner that the glass-plate-side end portion 42 located on the proximal end side of the glass-observing protrusion portion 44 abuts against the bottom surface of the concave portion 23 It is also possible to attach the inner electrode rod 17 to the inner electrode rod 17 in a manner that the other end of the glass obverse end portion 42 is brought into contact with the bottom surface of the recess portion 23.

The coil-shaped stopper 59 shown in Fig. 8 is arranged such that adjacent helical portions constituting the coil portion 41 are separated from each other when the coil-shaped stopper 59 does not closely detect the coil portion 41 and is in a free state. This facilitates the elastic deformation of the coil portion 41, which makes it easier to attach and detach the coil-shaped stopper 59 to and from the internal electrode rod 17.

The coil-shaped stopper 59 can be manufactured at a lower manufacturing cost than the coil-shaped stoppers 40, 55, 57 because there is no need to close the coil portion 41 tightly.

All of the electrode side projection portions 43 of the coil shape stoppers 61, 63, and 65 shown in Figs. 9 to 11 do not extend from the coil portion 41 to the arc tube 12 side, And extends toward the base end side. The distal end of any one of the electrode side projections 43 is terminated at the side of the bulb 12 rather than the glass tube side end 42 located at the base end side of the glass bulb projection 44.

When the coil-shaped stoppers 61, 63, 65 are thus mounted on the inner electrode rod 17, the end portion 42 of the coil part 41 of the coil part 41 contacts the end surface of the inner glass tube 21 23), it is possible to reduce the possibility that the end face of the inner glass tube 21 is damaged by the coil-shaped stoppers 61, 63, 65 and to prevent the end face of the coil portion 41 (the glass- It is possible to increase the pressing force from the glass tube 21 to the inner glass tube 21.

Each of the coil-shaped stoppers 63 and 65 is provided at both ends of the coil part 41 in the longitudinal direction with a portion that can be made of the glass-side end part 42 (the recess part 23 when brought into contact with the bottom surface of the concave part 23) (I.e., a surface-contacting portion with respect to the bottom surface of the base plate). Therefore, the coil-shaped stoppers 63 and 65 can be mounted on the internal electrode 17 as a means for bringing the glass-end-side end portion 42 positioned at the base end side of the glass-eye side projection portion 44 into contact with the bottom surface of the recessed portion 23 It is also possible to attach the glass electrode side end portion 42 located at the base end side of the electrode side projection portion 43 to the inner electrode rod 17 as a contact with the bottom face of the recess portion 23.

Since the electrode side projection 43 is located on the outer peripheral side of the coil portion 41 as well as the glass observation projection 44, when the electrode side projection 43 is fitted to the inner electrode rod 17, The electrode part side projection part 43 and the glass side projection part 44 can be used to elastically deform the coil part 41. [ The electrode side protrusion 43 and the glass side protrusion 44 are held by hand so that the electrode side protrusion 43 and the glass obturator protrusion 44 are held by the same amount (distance) The amount of elastic deformation of the coil part 41 is doubled compared with the case of pulling only the glass observing projection part 44 by pulling the coil part 44 in the circumferential direction apart from each other (when viewed in the axial direction of the coil part 41). Therefore, when the coil portion 41 is elastically deformed by using the electrode side projection portions 43 and the glass side projection portions 44, the mounting operation of the coil shape stoppers 61, 63, 65 to the internal electrode rods 17 is performed So that it can be carried out more efficiently.

The coil-shaped stopper 67 shown in Figs. 12 and 13 is formed by winding a part of the coil portion 41 in a double-wound manner.

The coil portion 41 of the coil-shaped stopper 67 has its end on the glass-side end 42 side doubled. However, when the coil portion 41 is in the free state, the overlapping portion 41a (the portion located on the outer circumferential side) is separated from the inner circumferential portion of the coil portion 41 to the outer circumferential side (see Fig. 13).

The overlapping winding portion 41a is separated from the inner peripheral side portion to the outer peripheral side of the coil portion 41 when the coil portion 41 is in the free state so that the inner peripheral side portion of the coil portion 41 does not interfere with the overlapping winding portion 41a It is easily elastically deformable in the direction of the diameter.

The coil-shaped stopper 67 having such a constitution has a contact area with respect to the end face (the bottom face of the concave portion 23) of the inner glass tube 21 of the glass-contact side end portion 42 of the coil portion 41 (overlapping portion 41a) It is possible to make the pushing pressure from the coil part 41 (the glass observation side end 42) to the inner glass tube 21 larger.

The coil-shaped stopper 69 shown in Fig. 14 is a modified example in which the overlapping portion 41a is formed in a wider range than the coil-shaped stopper 67. [

Further, the coil portion 41 of the coil-shaped stopper 71 shown in Fig. 15 is formed by triple-winding the end on the glass-sight side end portion 42 side. However, when the coil portion 41 is in the free state, it is wound around the winding-in portion (the innermost portion located on the inner most side, the overlapping portion 41a opposed to the inner circumference and the outer circumferential side of the overlapping portion 41a) (I.e., the overlapping winding portions 41b are located).

The portions of the coil portion 41 located on the inner circumferential side can be easily moved in the diametrical direction without interfering with the overlapping portion 41a since the portions of the coil portion 41 that are triple- It is elastically deformable.

The coil-shaped stopper 71 having the above-described configuration is arranged such that the glass-contact-side end portion 42 of the coil portion 41 (the overlapping portion 41a, the overlapping portion 41b) The contact pressure between the coil portion 41 (the glass observation side end portion 42) and the inner glass tube 21 is further increased because the contact area with the end surface of the inner glass tube 21 It is possible to enlarge it.

It is also possible to form the double winding portion or the triple winding portion throughout the lengthwise direction of the coil portion 41, or to increase the number of windings more than triple winding.

The coil-shaped stopper 73 shown in Fig. 16 is characterized by a circumferential position with respect to the electrode-side projection portion 43 of the glass-eye side projection portion 44. Fig. That is, when the electrode-side projection 43 and the glass-side projection 44 are positioned at an angle smaller than 180 degrees (when viewed in the axial direction of the coil section 41, the axis of the coil section 41 and the electrode- And the angle formed between the straight line connecting the axis part of the coil part 41 and the straight line connecting the glass-observing projection part 44 is less than 180 degrees) and the glass-projecting protruding part 44 is closer to the electrode- Is located on the winding direction side of the coil section (41) from the side projection section (43) side toward the glass projection protrusion (44) side. By doing so, it is possible to easily grasp the electrode side protrusion 43 and the glass side protrusion 44 with the thumb and the index finger of one hand, and by making the thumb and the index finger close to each other (the electrode side protrusion 43 and By making the glass-observing projection 44 close to the circumferential direction), the coil section 41 can be elastically deformed simply in the direction of the diameter. For example, when the electrode side protrusion 43 and the glass side protrusion 44 are brought close to each other in this manner, the amount of elastic deformation of the coil portion 41 becomes equal to the amount of elastic deformation of the glass obverse portion 44, the efficiency of mounting the internal electrode 17 is high. Further, since the jig or the tool is easy to grip with the tool, it is possible to more efficiently perform the mounting operation of the coil-shaped stopper 73 by using a jig or a tool.

When the coil shaped stoppers 40, 55, 57, 59, 61, 63, 65, 67, 69, 71, 73 are mounted on the inner electrode rod 17, The coil portion 41 is elastically deformed in the diametrical direction until the inner diameter of the entire coil portion 41 in the free state becomes larger than the outer diameter of the inner electrode electrode 17. In this state, And the coil shaped stoppers 40, 55, 57, 59, 61, 63, and 63 are elastically returned in the radial direction by inserting the coil-shaped stopper portions 17, 17, 65, 67, 69, 71, 73 may be attached to the inner electrode rod 17.

In the case where the inner diameter of the coil portion 41 in the free state is slightly smaller than the outer diameter of the inner electrode 17 (for example, when the inner diameter is a small diameter of several millimeters or less) It is possible to insert the end portion of the internal electrode 17 into the opening end portion of the coil portion 41 (in a state of not elastically deforming in the direction of diameter enlargement using the glass observing projection portion 44 or the like). When the internal electrode rod 17 is inserted in this manner, the coil portion 41 is elastically deformed by the outer peripheral surface of the internal electrode rod 17 in the diametrical direction and the coil portion 41 is generated, The entire inner surface of the part 41 is brought into close contact with the outer surface of the inner electrode rod 17.

The order of assembling the discharge lamp 10 is not limited to the above-described order. For example, the order of assembling the discharge lamp 10 may be a combination of the anode 16, the inner electrode 17, the inner glass tube 21, the inner metal ring 28, (Or an integral body including the cathode 51, the inner electrode rod 17, the inner glass tube 21, the inner metal ring 28, and the coil-shaped stopper 40) made of the stopper 40 Shaped stopper 40 is mounted on the internal electrode rod 17 after the anode 16 (or the cathode 51) is mounted on the internal electrode rod 17 and the internal shape of the internal glass tube 17 21 and the inner metal ring 28 may be mounted and then the position of the coil shaped stopper 40 may be adjusted and the glass observation side end portion 42 may be brought into contact with the recessed portion 23 of the inner glass tube 21. [

The internal glass tube 21 may be modified so as not to have the concave portion 23 on the end face of the anode 16 (cathode 51).

The discharge lamp 10 is not limited to the above-described embodiment. The present invention can be applied to the case where the discharge lamp 10 is provided with 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 adaptable to all discharge lamps.

[Industrial Availability]

A discharge lamp and a manufacturing method of a discharge lamp according to the present invention are characterized in that a coil-shaped stopper for restricting the slide of the glass tube to the electrode side with respect to the electrode rod during the welding operation to the glass tube of the sealing tube is simply and reliably mounted It is possible.

10 discharge lamp
11 discharge vessel
12 luminous tube
13, 14 bags
15 Positive side mount unit
16 anode (electrode)
17 Internal Electrode (Electrode)
19 External Electrode
21 Internal glass tube (glass tube)
22 fitting ball
23 Detail
25 External glass tube
26 fitting ball
28 Inner metal ring
29 through hole
31 outer metal ring
32 through holes
34 glass rods
35, 36 Electrode Support Ball
38 metal foil
40 Coil shape stopper
41 coil part
41a, 41b overlapping portion
42 Glass Observation End
43 Electrode Side Projection (End Configuration)
44 Glass observation projection (end part)
50 Cathode side mount unit
51 cathode (electrode)
55 Coil shape stopper
57 Coil shape stopper
59 Coil-shaped stopper
61 Coil shape stopper
63 Coil shape stopper
65 Coil shape stopper
67 Coil-shaped stopper
69 Coil shape stopper
71 Coil shape stopper
73 Coil shape stopper

Claims

An electrode positioned in an arc tube of a glass discharge vessel,
An electrode rod supporting the electrode at one end thereof,
A glass tube mounted on an outer circumferential surface of the electrode rod at a distance from the electrode,
An encapsulation tube which is partly welded to the outer circumferential surface of the glass tube and is continuous with the arc tube,
A coil-shaped stopper made of a metal wire and mounted on an outer circumferential surface of the electrode,
And,
Wherein the coil-
Wherein the glass tube has a glass tube side end portion in contact with the end surface of the glass tube and is elastically deformed in a diametrical direction from a free state having a diameter smaller than or equal to the diameter of the electrode tube, A coil portion formed by a part of the metal wire,
A pair of end portion constituting each of the ends of the metal wire and positioned on the electrode side of the glass tube side end portion,
And a discharge lamp.

The method according to claim 1,
Wherein the one end portion constituting portion constitutes a glass-observing projection portion protruding from the glass-facing end portion toward the electrode.

3. The method of claim 2,
And the glass observing projection portion is located on the outer peripheral side of the coil portion.

The method of claim 3,
When viewed in the axial direction of the coil part from the other end constituent part side, the other end constituent part and the glass obturator projected part are displaced at an angle smaller than 180 占 in the circumferential direction of the coil part, Wherein the end portion of the end portion is located closer to the winding direction of the coil portion than the end portion of the other end.

5. The method according to any one of claims 2 to 4,
Wherein a tip end of the glass observing projection portion is positioned closer to the glass surface than an end portion of the coil portion on the electrode side.

6. The method according to any one of claims 2 to 5,
And the other end constituting portion constitutes an electrode side projection portion protruding from an end of the coil portion on the electrode side.

6. The method according to any one of claims 2 to 5,
And the other end constituent part is constituted by an end of the coil part on the electrode side.

8. The method according to any one of claims 1 to 7,
Wherein the coil portion is a single winding structure.

9. The method according to any one of claims 1 to 8,
Wherein the coil-shaped stopper is made of a metal containing any one of tungsten, tantalum, molybdenum, and niobium.

An electrode positioned in an arc tube of a glass discharge vessel,
An electrode rod supporting the electrode at one end thereof,
A glass tube mounted on an outer circumferential surface of the electrode rod at a distance from the electrode,
An encapsulation tube which is partly welded to the outer circumferential surface of the glass tube and is continuous with the arc tube,
A coil-shaped stopper made of a metal wire and mounted on an outer circumferential surface of the electrode,
And,
Wherein the coil-
A coil portion having a glass tube side end portion capable of being in contact with an end surface of the glass tube at the electrode side and having a diameter smaller than or equal to the diameter of the electrode rod when in a free state,
A pair of end portion constituting each of the ends of the metal wire and positioned on the electrode side of the glass tube side end portion,
A method of manufacturing a discharge lamp,
An inserting step of elastically deforming the coil part in a free state having a diameter smaller than or equal to the diameter of the electrode rod in a diametrical direction until the electrode part becomes larger in diameter than the electrode rod,
A mounting step of making the inner surface of the coil part come into close contact with the outer circumferential surface of the electrode rod by the elastic force in the radial direction of the axis,
And
A welding step of placing the sealing tube on the outer circumferential surface of the glass tube and welding the sealing tube to the glass tube,
And the discharge lamp has a discharge space.

11. The method of claim 10,
The one end of the end constituent part constitutes a glass observing projection part protruding from the glass tube side end to the electrode side,
Wherein the inserting step is a step of inserting the electrode rod into the coil part in a state in which the coil part is elastically deformed in the direction of diameter enlargement while holding the glass bulb projection part.

12. The method of claim 11,
And the glass observing projection is located on the outer peripheral side of the coil portion.

13. The method of claim 12,
When viewed in the axial direction of the coil part from the other end constituent part side, the other end constituent part and the glass obturator projected part are displaced at an angle smaller than 180 占 in the circumferential direction of the coil part, Wherein the glass part is located on the winding direction side of the coil part facing the glass-plate side projection part from the end constituent part side than the other end part constituent part on the other side.

14. The method according to any one of claims 11 to 13,
Wherein a tip end of the glass observing projection portion is positioned closer to the glass tube than an end of the coil portion on the electrode side.

15. The method according to any one of claims 11 to 14,
And the other end constituting portion constitutes an electrode side projection portion protruding from an end of the coil portion on the electrode side.

15. The method according to any one of claims 11 to 14,
And the other end constituent portion is constituted by an end of the coil portion on the electrode side.

17. The method according to any one of claims 10 to 16,
Wherein the coil portion is a single-piece winding structure.

18. The method according to any one of claims 10 to 17,
Wherein the coil-shaped stopper is made of a metal containing any one of tungsten, tantalum, molybdenum, and niobium.