TW201413776A - Discharge lamp and method for producing discharge lamp - Google Patents

Abstract

Provided are: a discharge lamp such that a coiled stopper, which is for limiting a glass tube from sliding with respect to an electrode rod towards the electrode side during welding work of a sealing tube to the glass tube, can be easily and reliably mounted to the electrode rod; and a method for producing a discharge lamp. In the means for achieving same, the coiled stopper (40) is provided with: a coil section (41) that has a glass-tube-side end (42) that contacts the glass tube (21), has an inner surface that is in close contact with the outer peripheral surface of the electrode rod in the state of having been elastically deformed, in the direction of an expanded diameter from the free state of having a smaller diameter or the same diameter, by means of the electrode rod (17), and is configured from a portion of a metal wire member; and a pair of end configuring sections (43, 44) that are positioned at the electrode side of the glass-tube-side end and are respectively configured from the two ends of the metal wire member.

Description

Discharge lamp tube and method for manufacturing discharge lamp tube

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

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

The discharge lamp includes: an electrode (cathode or anode) provided in a glass discharge vessel; an electrode rod (electrode core rod) supporting the electrode at an end of one side; and a peripheral surface of the electrode rod and separated from the electrode The glass tube (holding cylinder) is melted on the outer peripheral surface of the glass tube to form a sealing tube (side tube) which is a part of the discharge vessel and is connected to the arc tube at one end. Further, although not disclosed in Patent Document 1, in general, a metal ring having a glass tube sandwiched between the electrode and the electrode is provided on the circumferential surface of the electrode rod.

When the sealing tube is melted on the outer peripheral surface of the glass tube, the sealing tube and the glass tube are rotated together in order to uniformly heat the entire sealing tube. As a result, the glass tube moves in the axial direction as the sealing tube rotates. Therefore, it is easy to form a gap between the glass tube and the metal ring. Assuming that the sealing tube is melted to the glass tube in a state in which the opposite faces of the glass tube and the metal ring are formed, when the discharge lamp is turned on, the inside of the discharge vessel becomes high pressure, and the glass tube is opposed to the slit. Part of the crack will occur, because of this crack, the discharge vessel is damaged.

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

The coil component of Patent Document 1 is obtained by winding a tungsten wire-pair electrode rod in two layers, and the electrode-side end portion is separated from the electrode. On the other hand, the glass tube side end portion of the coil element abuts against the end surface of the glass tube, thereby restricting the glass tube from sliding toward the electrode side on the electrode rod, so that the opposite side of the glass tube and the metal ring has no gap. .

Therefore, even if the sealing tube is swung against the outer peripheral surface of the glass tube, the opposing surface of the glass tube and the metal ring is less likely to form a slit, and the above-described problem is less likely to occur.

Advanced technical literature

Patent literature

Patent Document 1: Patent No. 3562271

Patent Document 2: JP-A-2009-231002

Patent Document 3: Patent No. 4,863,821

However, the coil component of Patent Document 1 is not formed into a coil shape before being attached to the electrode rod, but is formed into a coil shape by being wound around the electrode rod. That is, the tungsten wire is plastically deformed and wound tightly on the electrode rod in two layers. Therefore, the work of attaching the coil element to the electrode rod is extremely troublesome. In particular, a concave portion that receives the end portion of the glass tube side of the coil element is formed on the end surface of the glass tube (for example, refer to the end surface of the glass tube formed on the electrode side of Patent Document 2). In the case of a concave surface, the installation work is extremely difficult.

Moreover, there is a drawback as follows: once the coil component is wound around the electrode rod, it is difficult to adjust the position of the coil member to the electrode rod.

An object of the present invention is to provide a discharge lamp tube and a method of manufacturing the same, which can easily and reliably mount a coil-shaped stopper for the electrode rod, the coil-shaped stopper being used for sealing the tube to the glass tube In the soldering operation, the glass tube is restricted from sliding toward the electrode side with respect to the electrode rod.

The discharge lamp of the present invention comprises: an electrode located in an arc tube of a glass discharge vessel; an electrode rod supporting the electrode at an end of one side; and a glass tube attached from the electrode on an outer peripheral surface of the electrode rod a sealing tube which is connected to the outer peripheral surface of the glass tube and which is a part of the discharge vessel and which is connected to the arc tube; a coil-shaped stopper which is mounted on the outer peripheral surface of the electrode rod and is made of a metal wire; The coil-shaped stopper includes a coil portion having a glass tube-side end portion that abuts against an end surface of the glass tube on the electrode side, and is in a free state from a diameter smaller than the electrode rod or the same diameter as the electrode rod In a state in which the diameter-expanding direction is elastically deformed, the inner surface of the electrode is in close contact with the outer peripheral surface of the electrode rod, and is composed of a part of the metal wire; and a pair of end portions are respectively formed by both ends of the metal wire Located closer to the electrode side than the side end of the glass tube.

The one end portion forming portion constitutes a glass tube side protrusion, and the glass tube side end portion can protrude toward the electrode side.

In this case, the glass tube side protrusion may be located on the outer peripheral side of the coil portion.

Further, the end portion of the other side is viewed from the axial direction of the coil portion When viewed, the position of the other end portion and the glass tube side protrusion in the circumferential direction of the coil portion are shifted at an angle of less than 180 degrees, and the glass tube side protrusion portion is formed from the other end portion. The portion may be located closer to the winding direction side of the coil portion from the end portion forming portion to the glass tube side protrusion portion.

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

The other end portion forming portion may constitute an electrode side protrusion protruding from the end portion of the coil portion on the electrode side.

Further, the end portion of the coil portion on the electrode side may constitute the other end portion constituent portion.

The coil portion may have a single layer winding configuration.

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

In the method of manufacturing a discharge lamp of the present invention, the discharge lamp tube comprises: an electrode located in an arc tube of a glass discharge vessel; an electrode rod supporting the electrode at an end of one side; and being mounted on the electrode rod a glass tube that is separated from the electrode by the outer peripheral surface; a sealing tube that is connected to the outer peripheral surface of the glass tube and is a part of the discharge vessel and connected to the light-emitting tube; is mounted on the outer peripheral surface of the electrode rod, and is made of metal a coil-shaped stopper composed of a wire material, wherein the coil-shaped stopper includes a coil portion having a glass tube-side end portion that abuts against an end surface of the glass tube on the electrode side, and has a smaller diameter than the electrode rod in a free state Or a portion of the metal wire is formed in the same diameter as the electrode rod, and a pair of end portions are respectively formed by both ends of the metal wire, and are located closer to the electrode side than the end portion of the glass tube. The method includes: an inserting step that will be at a smaller diameter than the electrode rod or with the electricity The coil portion in a free state of the same diameter is elastically deformed in a diameter expansion direction until a larger diameter than the electrode rod, and the electrode rod is inserted into the coil portion; and the mounting step is performed to make the glass tube side end portion and the glass tube The end surface on the electrode side is in contact with each other, and the inner surface of the coil portion is in close contact with the outer peripheral surface of the electrode rod by the elastic force in the diameter reducing direction generated by the coil portion; and the sealing step, the sealing tube is sealed The outer peripheral surface of the glass tube is covered, and the sealing tube is melted on the glass tube.

The one end portion forming portion constitutes a glass tube side protruding portion that protrudes toward the electrode side from the glass tube side end portion, and the insertion step is such that the glass tube side protruding portion is held while the coil portion is expanded The electrode rod is inserted into the coil portion in a state where the radial direction is elastically deformed.

The glass tube side protrusion is located on the outer peripheral side of the coil portion.

In this case, when the end portion forming portion on the other side is viewed in the axial direction of the coil portion, the end portion forming portion on the other side and the position of the glass tube side protruding portion in the circumferential direction of the coil portion are When the angle smaller than 180 degrees is shifted, the glass tube side protrusion portion is located closer to the winding direction side of the coil portion from the end portion forming portion toward the glass tube side protrusion portion than the other end portion forming portion.

Further, the tip end of the glass tube side protrusion may be located closer to the glass tube side than the end portion of the coil portion on the electrode side.

The other end portion forming portion may constitute an electrode side protrusion protruding from the end portion of the coil portion on the electrode side.

Further, the end portion on the electrode side of the coil portion may constitute the other end portion.

The coil portion may have a single-layer winding structure.

The coiled stopper can be composed of tungsten, tantalum, molybdenum, and jingle The metal composition of any one of them.

The coil-shaped stopper of the present invention includes a coil portion having a glass tube-side end portion that abuts against an end surface on the electrode side of the glass tube, and has a smaller diameter than the electrode rod or the same diameter as the electrode rod in a free state. Therefore, when the coil portion is elastically deformed in the diameter-expanding direction, and the electrode rod is inserted into the coil portion while the diameter of the electrode rod is larger than the electrode rod, the operation of inserting the electrode rod into the coil portion can be smoothly performed. Further, in a state in which the glass tube side end portion and the end surface on the electrode side of the glass tube are brought into contact with each other, the inner surface of the coil portion and the outer peripheral surface of the electrode rod are in close contact with each other by the elastic force in the diameter reducing direction generated by the coil portion. It is possible to surely mount the coil-shaped stopper on the electrode rod.

In addition, the end surface of the metal wire constituting the coil-shaped stopper (the end surface of the end portion constituent portion) is not abutted, and the end portion of the coil portion on the glass tube side is in contact with the end surface on the glass tube electrode side. In the case where the end face of the metal wire contacts the end face of the glass tube, the end face of the metal wire and the end face of the glass tube are in point contact state, so that the glass tube is easily damaged by the end face (coil-shaped stopper) of the metal wire. The end face (the glass tube is prone to cracks). However, in the present invention, since the end portion of the glass tube formed on the coil portion is in contact with the end surface on the side of the glass tube electrode, it is not easy to damage the end surface of the glass tube by the coil-shaped stopper.

10‧‧‧Discharge lamp

11‧‧‧Discharger

13‧‧‧Block tube

14‧‧‧Blocking tube

15‧‧‧Anode side mounting unit

16‧‧‧Anode (electrode)

17‧‧‧Internal electrode rod (electrode rod)

19‧‧‧External electrode rod

21‧‧‧Internal glass tube (glass tube)

22‧‧‧ fitting holes

23‧‧‧ recess

25‧‧‧External glass tube

26‧‧‧ fitting holes

28‧‧‧Internal metal rings

29‧‧‧through holes

31‧‧‧External metal ring

32‧‧‧through holes

34‧‧‧ glass rod

35‧‧‧electrode support hole

36‧‧‧electrode support hole

38‧‧‧metal foil

40, 55, 57, 59, 61, 63, 65, 67, 69, 71, 73‧‧‧ coiled stop

41‧‧‧ coil part

41a‧‧‧Overlap winding

41b‧‧‧Overlap winding

42‧‧‧ glass tube side end

43‧‧‧Electrode side protrusion (end part)

44‧‧‧Glass tube side protrusion (end part)

50‧‧‧ Cathode side mounting unit

51‧‧‧ cathode

Fig. 1 is a longitudinal side view showing a discharge lamp tube to which an embodiment of the present invention is applied.

Fig. 2 is a longitudinal side view showing the anode side mounting unit in which the anode is omitted.

Figure 3 is a diagram showing the separation state of the internal electrode rod and the coiled stopper. Fig. (a) is a side view, and (b) is a view as seen from the direction of the arrow (a).

Fig. 4 is a view showing a state in which a part of the coil-shaped stopper is attached to the internal electrode rod, (a) is a side view, and (b) is a view as seen from the arrow direction of Fig. 3 (a).

Fig. 5 is a view showing a state in which a coil-shaped stopper is attached to an internal electrode rod, (a) is a side view, and (b) is a view as seen from the arrow direction of Fig. 3 (a).

Fig. 6 is a side view showing the coil-shaped stopper of the first modification.

Fig. 7 is a side view showing a coil-shaped stopper of a second modification.

Fig. 8 is a side view showing a coil-shaped stopper of a third modification.

Fig. 9 is a side view showing a coil-shaped stopper of a fourth modification.

Fig. 10 is a side view showing a coil-shaped stopper of a fifth modification.

Fig. 11 is a side view showing a coil-shaped stopper of a sixth modification.

Fig. 12 is a side view showing a coil-shaped stopper of a seventh modification.

Fig. 13 is a front elevational view showing the coil-shaped stopper of the seventh modification.

Fig. 14 is a side view showing the coil-shaped stopper of the eighth modification.

Fig. 15 is a side view showing a coil-shaped stopper of a ninth modification.

Fig. 16 is a side view showing a coil-shaped stopper of a tenth modification.

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

The main components of the discharge lamp tube 10 of the present embodiment are the discharge vessel 11, the anode-side mounting unit 15, and the cathode-side mounting unit 50.

The glass discharge vessel 11 is integrally provided with: a substantially spherical arc tube 12 and a pair of circular holes formed in the pair of the arc tubes 12 and coaxial with each other A pair of sealing tubes 13 and 14.

The anode side mounting unit 15 is formed by combining the following elements: an anode 16 (electrode), an internal electrode rod 17 (electrode rod), an external electrode rod 19, an inner glass tube 21 (glass tube), an outer glass tube 25, and an inner portion. The metal ring 28, the outer metal ring 31, the glass rod 34, the metal foil 38, and the coiled stopper 40.

The inner electrode rod 17 and the outer electrode rod 19 which extend in a straight line are both cylindrical members made of metal. The end of one side of the internal electrode rod 17 can support the anode 16 in a fixed state.

Both the inner glass tube 21 and the outer glass tube 25 are rotationally symmetric bodies centering on their own central axes. The inner glass tube 21 and the outer glass tube 25 have the same outer diameter, and the outer diameters of the two are slightly smaller than the inner diameters of the sealing tube 13 and the sealing tube 14. The dimension in the axial direction is such that the inner glass tube 21 is longer than the outer glass tube 25. At the central portion of the inner glass tube 21 and the outer glass tube 25, a fitting hole 22 and a fitting hole 26 extending along the center axis thereof are respectively formed. Both end faces of the inner glass tube 21 and the outer glass tube 25 are planes orthogonal to their central axes. Further, a concave portion 23 is formed on one end surface of the inner glass tube 21.

The inner metal ring 28 and the outer metal ring 31 are rotationally symmetric bodies centered on their own central axes. The inner metal ring 28 and the outer metal ring 31 have the same specifications, and the outer diameters thereof are approximately 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 thereof, and the inner metal ring 28 and the central portion of the outer metal ring 31 form through holes 29 and 32, respectively.

The glass rod 34 is a rotationally symmetric body centering on its own central axis, and its outer diameter is the same as that of the inner metal ring 28 and the outer metal ring 31. On both ends of the glass rod 34 The center portion forms the electrode support hole 35 and the electrode support hole 36 extending along the central axis thereof in a coaxial state, respectively. Both end faces of the glass rod 34 are planes orthogonal to the central axis of itself.

The metal foil 38 is an extremely thin strip-shaped element, and the anode-side mounting unit 15 has a plurality of metal foils 38.

The coil stopper 40 is an element obtained by processing a single metal wire containing any one of tantalum Ta, niobium Nb, tungsten W, and molybdenum Mo. When the coiled stopper 40 is made of a material containing 钽Ta or 铌Nb, it is possible to have an effect on a getter of oxygen or hydrogen. In addition, when it is made of a material containing tungsten W or molybdenum Mo, the strength of the coil-shaped stopper 40 can be increased (the result is that the pressing force to the inner glass tube 21 to be described later is also enhanced), and the coil-shaped stopper is lowered. 40 The possibility of being defective or severed in the manufacture of the discharge lamp tube 10.

The coil-shaped stopper 40 has a coil portion 41 that spirally winds a portion other than the both end portions of the metal wire in one direction, and an electrode-side projection 43 that is formed of both end portions of the metal wire. Part configuration part) and glass tube side protrusion part 44 (end part structure part). The coil portion 41 is wound in a single layer, and the inner diameter of the coil portion 41 in the free state is slightly smaller or the same as the outer diameter of the inner electrode rod 17. At this time, in order to prevent the coil-like stopper 40 from moving unexpectedly during the lighting of the discharge lamp tube 10, the expansion of the internal electrode rod 17 and the coil-shaped stopper 40 due to temperature is considered to determine the coil-like stopper 40. Wire diameter and inner diameter. However, the coil portion 41 can be elastically deformed from the free state to the diameter-expanding direction, and is elastically deformed in the diameter-expanding direction so that the inner diameter thereof is larger than the outer diameter of the inner electrode rod 17. Further, since the coil portion 41 is tightly wound, the mutually adjacent spiral portions constituting the coil portion 41 are in contact with each other when in the free state. In addition, the long side of the coil portion 41 The end (end surface) of one side of the direction constitutes the glass tube side end portion 42. The electrode side protrusion 43 linearly extends from the end portion of the coil portion 41 toward the side opposite to the glass tube side end portion 42. On the other hand, the glass tube side protrusion 44 located on the outer peripheral side of the coil portion 41 is the same as the end portion (the end portion on the glass tube side end portion 42 side) of the coil portion 41 as the electrode side protrusion 43 The direction extends in a straight line.

On the other hand, the cathode side mounting unit 50 is formed by combining the following elements: the internal electrode rod 17, the external electrode rod 19, the inner glass tube 21, the outer glass tube 25, the inner metal ring 28, the outer metal ring 31, and the glass. The rod 34, the metal foil 38, the coiled stopper 40, and the cathode 51 (electrode). The cathode side mounting unit 50 is an end portion that supports the cathode 51 on one side of the internal electrode rod 17 in a fixed state, and the other portions are the same as the anode side mounting unit 15 except for this point.

Next, the assembly method of the discharge lamp tube 10 having the above-described constituent elements will be described.

First, the anode side mounting unit 15 and the cathode side mounting unit 50 are separately assembled according to the method described later.

When the anode side mounting unit 15 is assembled, the internal electrode rod 17 is first inserted into the through hole 29 of the inner metal ring 28, and the inner metal ring 28 is fixed to the inner electrode rod 17 at the intermediate position of the inner electrode rod 17. Further, the end of one side of the internal electrode rod 17 is inserted into the fitting hole 22 of the inner glass tube 21 so that there is no gap between the end surface on the opposite side to the concave portion 23 of the inner glass tube 21 and the end surface of the inner metal ring 28. Then, the coil portion 41 of the coiled stopper 40 is held by one hand, and the glass tube side protrusion 44 located on the outer peripheral side of the coil portion 41 is held by the other hand at the same time, and the glass tube side protrusion is held. 44 toward the electrode side protrusion 43 (from the axis of the coil portion 41) When viewed in the line direction, the end portion of the coil portion 41 on the glass tube side end portion 42 side in the free state is elastically opened in the direction away from the electrode side protrusion portion 43 in the circumferential direction. The deformation is such that the inner diameter of the end portion of the coil portion 41 on the side of the glass tube side end portion 42 is larger than the outer diameter of the inner 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 side of the glass tube side end portion 42 (see FIG. 4). When one end portion of the internal electrode rod 17 is further inserted into the coil portion 41, the end portion on the side of the glass tube side end portion 42 of the coil portion 41 is closer to the portion on the side of the electrode side protrusion portion 43 because of the internal electrode rod 17. The inner diameter electrode rod 17 penetrates the coil portion 41 so as to be elastically deformed in the diameter expansion direction. When the glass tube side end portion 42 of the coil portion 41 and the bottom surface of the concave portion 23 are in contact with each other, the hand is separated from the glass tube side protrusion portion 44 so that the external force transmitted through the glass tube side protrusion portion 44 and the coil portion 41 disappears ( Refer to Figure 5). In this way, the end portion of the coil portion 41 on the side of the glass tube side end portion 42 is elastically restored in the direction of diameter reduction. Therefore, 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 the diameter reduction. Therefore, the coil portion 41 (the coiled stopper 40) positions the internal electrode rod 17 and is maintained in contact with the bottom surface of the concave portion 23 of the glass tube side end portion 42. Therefore, the surface contact state of the inner glass tube 21 and the inner metal ring 28 is maintained.

After the coil-shaped stopper 40 is attached to the internal electrode rod 17, the anode 16 is attached to the end portion of the internal electrode rod 17 in a fixed state.

In this manner, the outer electrode rod 19 and the outer glass tube 25 are assembled while assembling the integrated article 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. And an integral article composed of the outer metal ring 31. That is, the external electrode rod 19 is inserted into the outer metal In the through hole 32 of the ring 31, the outer metal ring 31 is fixed to the outer electrode rod 19 at an intermediate position of the outer electrode rod 19, and the end of one side of the outer electrode rod 19 is inserted into the fitting hole 26 of the outer glass tube 25. In this case, the end surface of one side of the outer glass tube 25 and the end surface of the outer metal ring 31 are brought into surface contact.

Then, the end portion of the internal electrode rod 17 opposite to the coil-shaped stopper 40 is fitted to the electrode support hole 35 of the glass rod 34 in a fixed state, and the inner metal ring 28 is opposite to the inner glass tube 21 The end faces are in surface contact with the end faces of the glass rods 34. Further, the end portion of the external electrode rod 19 opposite to the outer glass tube 25 is fitted to the electrode support hole 36 of the glass rod 34 in a fixed state, and the end surface of the outer metal ring 31 opposite to the outer glass tube 25 and the glass are provided. The end faces of the rods 34 are in surface contact.

Subsequently, a plurality of metal foils 38 are extended in a direction parallel to the inner electrode rods 17 and the outer electrode rods 19, and then the outer peripheral surfaces of the metal foils 38 and the glass rods 34 are brought into contact. At this time, the circumferential direction of each metal foil 38 is equiangularly spaced, 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 of the metal foils 38 are in contact with the outer circumferential surfaces of the inner metal ring 28 and the outer metal ring 31, and both end portions of the respective metal foils 38 are respectively adhered to the inner metal ring 28 and the outer metal ring. The outer perimeter of 31.

When the anode-side mounting unit 15 is assembled as described above, the inner metal ring 28, the outer metal ring 31, and the respective metal foils 38 are passed through, so that the inner electrode rod 17 and the outer electrode rod 19 can be electrically connected.

On the other hand, the cathode side mounting unit 50 is not attached to the anode 16 but mounts the cathode 51 at the end of the internal electrode rod 17, and other than this, it can be assembled in accordance with the same method as the anode side mounting unit 15.

Then, 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 placed in the arc tube 12. Similarly, the cathode side mounting unit 50 is inserted into the sealing tube 14 from the opening end opposite to the arc tube 12, and the cathode 51 is placed in the arc tube 12.

Then, the inside of the discharge vessel 11 is decompressed by a through hole (not shown) formed in the arc tube 12, and in the decompressed state, the sealing tube 13 and the sealing tube 14 are rotated while the burner is used. Wait for the outer peripheral surface to be heated. As a result, the sealing tube 13 and the sealing tube 14 are fused to the inner glass tube 21, the outer glass tube 25, and the glass rod 34 (the portion exposed from the adjacent metal foil 38) while being reduced in diameter. The outer perimeter. When the sealing tube 13 and the sealing tube 14 are fused 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, as described above, the coil-shaped stopper 40 (the glass tube side end) The portion 42) maintains a state in which there is no gap between the inner glass tube 21 and the inner metal ring 28.

Finally, the air in the discharge vessel 11 is taken out by the through holes of the arc tube 12, and mercury or a rare gas or the like is injected into the discharge vessel 11, and the through hole is plugged after the injection.

The anode and cathode of the power source (omitted drawing) are respectively connected to the external electrode rod 19 and the cathode of the anode side mounting unit 15 of the discharge lamp tube 10 assembled as described above through a connection cable or an ON/OFF control switch or the like. The outer electrode rod 19 of the side mounting unit 50. When the ON/OFF control switch is switched to the ON state, a voltage that destroys the insulation is applied between the anode 16 and the cathode 51, thereby generating a discharge to cause the discharge lamp 10 to be lit, and if the ON/OFF control switch is switched to OFF. In the state, the discharge lamp 10 is turned off.

The discharge lamp tube 10 of the embodiment described above is a single layer Since the coil portion 41 which is structurally and easily deformed is elastically deformed and the coil-shaped stopper 40 is attached to the internal electrode rod 17, the mounting work for attaching the coil-shaped stopper 40 to the internal electrode rod 17 is facilitated. Further, when the inner electrode rod 17 is attached to the inner electrode rod 17, the coil portion 41 of the coil-shaped stopper 40 generates an elastic force in a direction in which the inner electrode rod 17 is in close contact with each other. Therefore, the coil-shaped stopper 40 can be surely attached to the inner electrode rod. 17 on.

Further, the glass tube side protrusion 44 is pulled apart to be elastically deformed again in the diameter expansion direction until the coil portion 41 has a larger diameter than the internal electrode rod 17, and at this time, the coil portion 41 is slidable relative to the internal electrode rod 17. Since the state is thus adjusted, the position of the coiled stopper 40 to the internal electrode rod 17 can be simply adjusted.

In addition, the electrode-side protrusion 43 of the coil-shaped stopper 40 and the end surface of the glass tube-side protrusion 44 (the end surface of the above-mentioned metal wire constituting the coil-shaped stopper 40) are not the glass tube side end of the coil portion 41. Since the end portion 42 and the end surface of the inner glass tube 21 (the bottom surface of the concave portion 23) are in surface contact with each other, it is less likely that the end surface of the inner glass tube 21 is damaged by the coil-shaped stopper 40. Further, since the glass tube side end portion 42 of the coil portion 41 and the end surface of the inner glass tube 21 (the bottom surface of the concave portion 23) are in surface contact, the coiled stopper 40 (the glass tube side end portion 42) is brought to the inner glass tube 21. The pushing force is large, and the surface contact state of the inner glass tube 21 and the inner metal ring 28 can be surely maintained.

In addition, the tip end portion of the glass tube side protrusion portion 44 faces the outer peripheral surface of the inner electrode rod 17, but the tip end portion of the glass tube side protrusion portion 44 is separated from the outer circumferential side of the inner electrode rod 17 so that it does not The surface of the internal electrode rod 17 is damaged by the tip end portion of the glass tube side protrusion 44. It is not because the debris generated from the surface of the internal electrode rod 17 remains in the arc tube 12, and the crumb is steamed when it is lit. The hair is attached to the inner wall of the light-emitting tube 12, and the light-emitting tube 12 is blackened.

Furthermore, since the coil portion 41 has a single-layer structure, the manufacturing cost of the coil-shaped stopper 40 can be reduced.

Although the present invention has been described above using the above embodiments, the present invention can be carried out with various modifications.

For example, the coil-shaped stopper can be implemented in the state shown in Figs. 6 and 7.

The electrode side protrusion 43 and the glass tube side protrusion 44 of the coiled stopper 55 shown in Fig. 6 are shorter than the coil type stopper 40. Therefore, compared with the coiled stopper 40, the possibility of occurrence of discharge between the anode 16 or the cathode 51 and the electrode side protrusion 43 or the glass tube side protrusion 44 is low. When discharge occurs in such a state, the discharged electrode side protrusion 43 or the glass tube side protrusion 44 is eluted due to high heat, and the eluted portion may adhere to the inner surface of the arc tube 12 to cause cracking of the arc tube 12. However, this risk can be reduced by this modification.

The coil-shaped stopper 57 shown in Fig. 7 is an end portion (end portion) of one side of the metal wire constituting the coil-shaped stopper 40, and constitutes an end on the anode 16 (cathode 51) side, and does not exist. There is a portion that is equivalent to the electrode side protrusion 43. Therefore, the possibility of occurrence of discharge between the anode 16 and the cathode 51 is lower than that of the coil stopper 55 of Fig. 6. In addition, the coil-shaped stopper 57 forms a portion which can be the glass tube-side end portion 42 at both ends in the longitudinal direction of the coil portion 41 (when the bottom surface of the concave portion 23 is in contact with the bottom surface of the concave portion 23, the surface of the concave portion 23 is in surface contact. Part). Therefore, it is possible to mount on the internal electrode rod 17 in a state in which the glass tube side end portion 42 of the coil-like stopper 57 on the proximal end side of the glass tube side protrusion 44 and the bottom surface of the concave portion 23 are brought into contact with each other. And, can be made on the other side of the glass tube side end 42 is attached to the internal electrode rod 17 in a state in which the bottom surface of the concave portion 23 abuts.

Further, in the coiled stopper 59 of Fig. 8, the coil portion 41 is not tightly wound, and in the free state, the spiral portions adjacent to each other constituting the coil portion 41 are separated from each other. As a result, since the coil portion 41 is more easily elastically deformed, the coil-like stopper 59 can easily attach and detach the internal electrode rod 17.

Further, since it is not necessary to tightly wind the coil portion 41, the coil-shaped stopper 59 can be manufactured at a lower manufacturing cost than the coil-shaped stoppers 40, 55, and 57.

In addition, the electrode-side protrusions 43 of the coil-shaped stoppers 61, 63, and 65 shown in FIGS. 9 to 11 extend toward the proximal end side of the glass tube side protrusion 44 instead of the coil portion 41. It extends toward the side of the light-emitting tube 12. However, the tip end of the electrode side protrusion 43 is at a position closer to the side of the light-emitting tube 12 than the glass tube-side end portion 42 located on the proximal end side of the glass tube side protrusion 44.

In the case of such a configuration, when the coil-shaped stoppers 61, 63, and 65 are attached to the internal electrode rod 17, the glass tube side end portion 42 of the coil portion 41 and the end surface of the inner glass tube 21 (the bottom surface of the concave portion 23) Since the surface is in contact, it is less likely that the end faces of the inner glass tube 21 are damaged by the coil-like stoppers 61, 63, and 65, and the coil portion 41 (the glass tube-side end portion 42) can be made to the inner glass tube 21. The pushing pressure is large.

In addition, the coil-shaped stoppers 63 and 65 are formed at both ends in the longitudinal direction of the coil portion 41, and can be formed as the glass tube-side end portion 42 (when the bottom surface of the concave portion 23 is in contact with the bottom surface of the concave portion 23, The area of contact with the surface). Therefore, the inner electrode rod 17 can be mounted not only in the state in which the coil-shaped stoppers 63 and 65 are located on the base end side of the glass tube side protrusion 44 and the bottom surface of the concave portion 23 is in contact with each other. Further, it is also possible to be on the side of the glass tube side located on the proximal end side of the electrode side protrusion 43 42 is attached to the internal electrode rod 17 in a state in which the bottom surface of the recess 23 abuts.

In addition, since the glass side protrusions 44 are not only the outer peripheral side of the coil portion 41 (because the electrode side protrusions 43 are separated from the surface of the internal electrode rods 17 when mounted on the internal electrode rods 17), Therefore, the coil portion 41 can be elastically deformed by the electrode side protrusion portion 43 and the glass tube side protrusion portion 44. For example, the electrode side protrusion 43 and the glass tube side protrusion 44 are held by hand, and the electrode side protrusion 43 and the glass tube side protrusion 44 are pulled toward each other in a circumferential direction (when viewed from the axial direction of the coil portion 41). When the amount (distance) is the same as the case where only the glass tube side protrusion 44 is pulled apart, the amount of elastic deformation of the coil portion 41 is doubled as compared with the case where only the glass tube side protrusion 44 is pulled apart. Therefore, when the coil portion 41 is elastically deformed by the electrode side protrusion portion 43 and the glass tube side protrusion portion 44, the mounting operation of the coiled stoppers 61, 63, and 65 to the internal electrode rod 17 can be performed more efficiently.

Further, the coil-shaped stopper 67 shown in Figs. 12 and 13 is formed by winding a part of the coil portion 41 into a double layer.

The coil portion 41 of the coil-shaped stopper 67 has a double-layered end portion on the side of the glass tube side end portion 42. However, when the coil portion 41 is in the free state, the overlap-wound portion 41a (the portion on the outer peripheral side) is separated from the inner peripheral side portion of the coil portion 41 toward the outer peripheral side (see FIG. 13).

When the coil portion 41 is in the free state, the overlap-wound portion 41a is separated from the inner peripheral side portion of the coil portion 41 toward the outer peripheral side. Therefore, the inner peripheral side portion of the coil portion 41 does not interfere with the overlap-wound portion 41a, and can be easily The ground is elastically deformed in the direction of diameter expansion.

In the coil-shaped stopper 67 having such a configuration, the glass tube-side end portion 42 of the coil portion 41 (overlapping winding portion 41a) has a larger contact area with respect to the end surface of the inner glass tube 21 (the bottom surface of the concave portion 23), so that it can further Increase from the coil portion 41 (glass tube The side end portion 42) is pushed to the inner glass tube 21.

The coil-shaped stopper 69 shown in Fig. 14 is a modification in which the overlapping winding portion 41a is formed in a larger range than the coil-shaped stopper 67.

In addition, the coil portion 41 of the coil-shaped stopper 71 shown in Fig. 15 is formed by winding three end portions on the side of the glass tube side end portion 42. However, when the coil portion 41 is in the free state, the three-layered portion (the inner peripheral portion on the innermost peripheral side, the overlapped wound portion 41a opposed to the inner peripheral portion, and the outer peripheral side on the overlapped wound portion 41a) The overlapping winding portions 41b) are separated from each other.

When the coil portion 41 is in the free state, the three-layered portions are separated from each other. Therefore, the portion on the inner peripheral side of the coil portion 41 does not interfere with the overlap-wound portion 41a, and can be easily elastically deformed in the diameter-expanding direction.

In the coil-shaped stopper 71 having such a configuration, the glass tube side end portion 42 of the coil portion 41 (the overlapping winding portion 41a and the overlapping winding portion 41b) faces the inner glass tube 21 as compared with the coil-shaped stoppers 67 and 69. Since the contact area of the end surface (the bottom surface of the concave portion 23) is larger, the pressing force from the coil portion 41 (the glass tube side end portion 42) to the inner glass tube 21 can be further increased.

Further, although the drawings are omitted, a double-layered winding portion or a three-layered winding portion may be formed in the entire longitudinal direction of the coil portion 41, or the number of layers to be wound may be increased to three or more layers. .

The coil-shaped stopper 73 shown in Fig. 16 is characterized by a circumferential position of the counter electrode side protrusion 43 of the glass tube side protrusion 44. In other words, the electrode side protrusions 43 and the glass tube side protrusions 44 are provided at an angle of less than 180 degrees (the axis of the coil portion 41 and the line connecting the electrode side protrusions 43 when viewed from the axial direction of the coil portion 41, And a straight line connecting the axis of the coil portion 41 and the glass tube side protrusion 44 The angle of the formed angle is less than 180 degrees, and the position of the glass tube side protrusion 44 is closer to the winding direction side of the coil portion 41 from the electrode side protrusion 43 side toward the glass tube side protrusion 44 side than the electrode side protrusion 43. . Thereby, the electrode side protrusion 43 and the glass tube side protrusion 44 can be easily held by, for example, a thumb and an index finger with one hand, and the thumb and the index finger are brought closer together (so that the electrode side protrusion 43 and the glass tube are laterally protruded). The portion 44 is close to the circumferential direction, and the coil portion 41 can be easily elastically deformed in the diameter increasing direction. For example, when the electrode side protrusions 43 and the glass tube side protrusions 44 are brought close to each other as described above, as in the case of the modification of the ninth to eleventh drawings, the amount of elastic deformation of the coil portion 41 is larger than that of the glass tube. Since the side protrusion 44 is doubled, the efficiency of the mounting work of the internal electrode rod 17 is high. Further, since it is a state that can be easily gripped by a jig or a tool, the mounting work of the coil-shaped stopper 73 can be performed more efficiently by using a jig or a tool.

When the coil-shaped stoppers 40, 55, 57, 59, 61, 63, 65, 67, 69, 71, and 73 are attached to the internal electrode rod 17, the glass tube side protrusions 44 and the like can be pulled apart. The coil portion 41 can be elastically deformed in the diameter increasing direction until the inner diameter of the entire coil portion 41 in the free state is larger than the outer diameter of the inner electrode rod 17, and in this state, the inner electrode rod 17 is inserted into the coil portion 41, and thereafter, The external force applied to the glass tube side protrusion 44 or the like disappears, whereby the coil portion 41 is restored to elasticity in the direction of the diameter reduction, and the coil-shaped stoppers 40, 55, 57, 59, 61, 63, 65, 67, 69, 71, 73 are mounted on the internal electrode rod 17.

Further, in the case where the inner diameter of the coil portion 41 in the free state is only slightly smaller than the inner diameter of the inner electrode rod 17 (for example, only a difference of a few decimal points) or the same, the inner electrode rod 17 can be used. The end portion is inserted into a free state (the glass tube side protrusion 44 or the like is not used to be elastically deformed in the diameter expansion direction The open end of the coil portion 41 of the state. When the internal electrode rod 17 is inserted as described above, the coil portion 41 is elastically deformed in the diameter-expanding direction by the outer peripheral surface of the internal electrode rod 17, and the coil portion is caused by the elastic force generated in the diameter-reduction direction of the coil portion 41. The entire inner surface of the 41 is in close contact with the outer surface of the inner electrode rod 17.

Further, the assembly procedure of the discharge lamp tube 10 is not limited to the above-described program. For example, the anode 16 , the internal electrode rod 17 , the internal glass tube 21 , the internal metal ring 28 , and the coil-shaped stopper 40 may be assembled. When the integrated body (or the cathode 51, the internal electrode rod 17, the inner glass tube 21, the inner metal ring 28, and the coil-shaped stopper 40 are integrally formed), the anode 16 (or the cathode 51) is mounted after the internal electrode rod 17 Then, the coiled stopper 40 is temporarily mounted on the internal electrode rod 17, and after the inner glass tube 21 and the inner metal ring 28 are attached to the internal electrode rod 17, the position of the coiled stopper 40 is adjusted to make the glass The tube side end portion 42 abuts against the concave portion 23 of the inner glass tube 21.

Further, the inner glass tube 21 may be changed so that the concave portion 23 is not provided on the end surface on the anode 16 (cathode 51) side.

Further, the discharge lamp tube 10 is not limited to the above-described embodiment, and the present invention can be applied to all discharge lamp tubes having 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.

17‧‧‧Internal electrode rod

21‧‧‧Internal glass tube

23‧‧‧ recess

40‧‧‧ coiled stopper

41‧‧‧ coil part

43‧‧‧Electrode side protrusion (end part)

44‧‧‧Glass tube side protrusion (end part)

Claims (18)

A discharge lamp comprising: an electrode located in an arc tube of a discharge vessel made of glass; an electrode rod supporting the electrode at an end of one side; a glass tube mounted on the outer peripheral surface of the electrode rod from the electrode; a sealing tube which is a portion of the discharge vessel and which is connected to the arc tube; and a coil-shaped stopper which is formed of a metal wire on the outer peripheral surface of the electrode rod; wherein the coil is in the outer peripheral surface of the glass tube The stopper includes a coil portion having a glass tube side end portion that abuts against an end surface of the glass tube on the electrode side, and is expanded in a free state from a diameter smaller than the electrode rod or the same diameter as the electrode rod. In a state in which the direction is elastically deformed, the inner surface of the electrode itself is in close contact with the outer peripheral surface of the electrode rod, and is composed of a part of the metal wire; and a pair of end portions are respectively formed by both ends of the metal wire. The side of the glass tube is closer to the electrode side than the side end of the glass tube. In the discharge lamp tube according to the first aspect of the invention, the one end portion forming portion constitutes a glass tube side protrusion, and the glass tube side end portion protrudes toward the electrode side. The discharge lamp tube according to claim 2, wherein the glass tube side protrusion is located on an outer peripheral side of the coil portion. The discharge lamp tube according to claim 3, wherein the end portion of the other side is viewed from the axial direction of the coil portion, and the other end portion is configured. The position of the portion and the glass tube side protrusion in the circumferential direction of the coil portion is shifted by an angle of less than 180 degrees, and the end portion of the glass tube side protrusion is located closer to the end portion from the end portion. The winding direction side of the coil portion of the glass tube side protrusion. The discharge lamp according to any one of claims 2 to 4, wherein a tip end of the glass tube side protrusion is located closer to the glass tube side than an end portion of the coil portion on the electrode side. The discharge lamp tube according to any one of claims 2 to 5, wherein the other end portion forming portion constitutes an electrode side protrusion projecting from an end portion of the coil portion on the electrode side. The discharge lamp according to any one of claims 2 to 5, wherein the end portion on the electrode side of the coil portion constitutes the other end portion constituent portion. The discharge lamp according to any one of claims 1 to 7, wherein the coil portion has a single-layer winding structure. The discharge lamp 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. A method of manufacturing a discharge lamp tube, comprising: an electrode located in an arc tube of a glass discharge vessel; an electrode rod supporting the electrode at an end of one side; and being mounted on an outer circumference of the electrode rod a glass tube that is separated from the electrode; a sealing tube that is connected to the outer peripheral surface of the glass tube and is a part of the discharge vessel and connected to the light-emitting tube; is mounted on the outer peripheral surface of the electrode rod, and is composed of a metal wire Coiled stop The coiled stopper includes a coil portion having a glass tube side end portion that abuts against an end surface of the glass tube on the electrode side, and is in a free state smaller than the electrode rod or the same as the electrode rod a diameter of a portion of the metal wire; and a pair of end portions respectively formed by two ends of the metal wire, located closer to the electrode side than the end portion of the glass tube, the method comprising: an inserting step The coil portion in a free state smaller than the diameter of the electrode rod or the same diameter as the electrode rod is elastically deformed in a diameter-expanding direction, and has a larger diameter than the electrode rod, and the electrode rod is inserted into the coil portion; The glass tube side end portion is brought into contact with the end surface of the glass tube on the electrode side, and the inner surface of the coil portion and the outer circumference of the electrode rod are made by the elastic force in the diameter reducing direction generated by the coil portion. And sealing the step; covering the outer peripheral surface of the glass tube with the sealing tube, and sealing the sealing tube to the glass tube. The method of manufacturing a discharge lamp according to claim 10, wherein the one end portion forming portion constitutes a glass tube side protrusion, and the glass tube side end portion protrudes toward the electrode side, the insertion step The electrode rod is inserted into the coil portion while holding the glass tube side protrusion while elastically deforming the coil portion in the diameter expansion direction. The method of manufacturing a discharge lamp according to claim 11, wherein the glass tube side protrusion is located on an outer peripheral side of the coil portion. The method for manufacturing a discharge lamp according to claim 12, wherein In the discharge lamp tube, when the end portion forming portion on the other side is viewed in the axial direction of the coil portion, the other end portion forming portion and the glass tube side protruding portion are in the circumferential direction of the coil portion. The position is shifted by an angle of less than 180 degrees, and the end portion of the glass tube side protrusion is located closer to the winding direction side of the coil portion from the end portion forming portion toward the glass tube side protrusion. The method of manufacturing a discharge lamp according to any one of claims 11 to 13, wherein a tip end of the glass tube side protrusion is located closer to the glass tube side than an end portion of the coil portion on the electrode side. . The method for producing a discharge lamp according to any one of the eleventh to fourteenth aspect, wherein the other end portion forming portion constitutes an electrode side protrusion protruding from an end portion of the coil portion on the electrode side. unit. In the method of manufacturing a discharge lamp according to any one of the items of the present invention, the end portion of the coil portion on the electrode side constitutes the other end portion constituent portion. The method of manufacturing a discharge lamp according to any one of claims 10 to 16, wherein the coil portion has a single-layer winding structure. The method of manufacturing a discharge lamp 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.