TW201905958A - Discharge lamp - Google Patents

Abstract

The utility model provides a discharge lamp. Embodiment's the metal forming that discharge lamp included include with the first junction surface of the outer peripheral face joint of electrode axle and with the second junction surface of the outer peripheral face joint of lead wire. In a junction surface department, between the outer peripheral face and blocking foil of electrode axle, dispose thefusing point and than electrode axle and the lower supplementary metal material of joint of blocking foil, just have the space by formation material, electrode axle and the blocking foil encirclementof sealing, in the space, the joint is assisted metal material and is formed the material contactless. The utility model discloses the formation material that can restrain the sealing at the junctionsurface between junction surface, metal forming and lead wire between metal forming and the electrode axle produces the crack.

Description

Discharge lamp

This invention relates to a discharge lamp.

For example, in an exposure step of a semiconductor, a drying step of an ultraviolet (UV) ink or a UV coating, a curing step of a resin, or the like, in order to carry out a photochemical reaction via ultraviolet rays, a long arc type discharge lamp is used as a discharge. A source of ultraviolet light.

Such a discharge lamp includes an arc tube formed with a sealing portion that seals a discharge space. A metal foil is embedded in the inside of the sealing portion, and the metal foil is bonded to an electrode shaft around which a coil is wound, and a lead wire supplied with electric power from the outside. The metal foil is welded and joined to the outer peripheral surface of the end portion of the electrode shaft and the outer peripheral surface of the end portion of the lead. [Prior Art Literature]

[Patent Document 1] Japanese Patent No. 3910290 (Patent Document 2) Japanese Patent No. 4494224

[Problems to be Solved by the Invention] Patent Document 1 discloses a technique in which a paste-like or powder-like bonding auxiliary metal material is filled in two corner portions formed on the surface of the metal foil and the outer peripheral surface of the electrode shaft, and The bonding auxiliary metal material is irradiated with a laser beam, thereby performing soldering. In the technique of Patent Document 1, weld marks of the joint auxiliary metal material irradiated with the laser beam are generated at the two corner portions. Therefore, there is a problem that since the weld mark is in contact with the glass material of the sealing portion, when the sealing portion is thermally deformed, the sealing portion is liable to be cracked by the weld mark.

Further, Patent Document 2 describes a technique of welding an electrode shaft and a metal foil via a coil wound around an electrode shaft. In Patent Document 2, a metal foil formed of molybdenum, a coil formed of tungsten, and an electrode shaft are melted to form a molten portion. Therefore, when the molten portion is formed, the output of the laser beam irradiated to the metal foil, the coil, and the electrode shaft is high, and the metal foil is likely to generate a large weld mark. Therefore, there is a problem that since the large weld mark is in contact with the glass material of the sealing portion, when the sealing portion is thermally deformed, the sealing portion is liable to be cracked by the weld mark. Therefore, in the techniques described in Patent Document 1 and Patent Document 2, the weld marks of the joint portion in the metal foil may cause cracks in the seal portion.

Accordingly, an object of the present invention is to provide a discharge lamp capable of suppressing occurrence of cracks in a joint portion between a metal foil and an electrode shaft and a seal portion of a joint portion between a metal foil and a lead. [Technical means to solve the problem]

The discharge lamp of the embodiment includes: an arc tube including a sealing portion that seals the discharge space; an electrode shaft supported by the sealing portion; a metal foil disposed at the sealing portion and electrically connected to the electrode shaft; a lead wire disposed at the sealing portion and electrically connected to the metal foil, the metal foil including a first joint portion joined to an outer peripheral surface of the electrode shaft, and a second joint joined to an outer peripheral surface of the lead wire In the joint portion, in the first joint portion, a joint auxiliary metal material having a lower melting point than the electrode shaft and the metal foil is disposed between the outer peripheral surface of the electrode shaft and the metal foil, and has a void surrounded by the forming material of the sealing portion, the electrode shaft, and the metal foil, in which the bonding auxiliary metal material is not in contact with the forming material. A discharge lamp according to another embodiment includes: an arc tube including a sealing portion that seals a discharge space; an electrode shaft supported on the sealing portion; a metal foil disposed on the sealing portion and electrically connected to the electrode shaft And a lead wire disposed at the sealing portion and electrically connected to the metal foil, the metal foil including a first joint portion joined to an outer peripheral surface of the electrode shaft, and a joint with an outer peripheral surface of the lead wire In the second bonding portion, a bonding auxiliary metal material having a lower melting point than the lead wire and the metal foil is disposed between the outer peripheral surface of the lead and the metal foil, and has A void surrounded by the forming material of the sealing portion, the lead, and the metal foil, the bonding auxiliary metal material is not in contact with the forming material in the void.

[Effects of the Invention] According to the present invention, it is possible to suppress the occurrence of cracks in the joint portion between the metal foil and the electrode shaft and the seal portion of the joint portion between the metal foil and the lead.

The discharge lamp 5 of the embodiment described below includes an arc tube 6, an electrode shaft 8, a metal foil 10, and a lead 12. The light-emitting tube 6 includes a sealing portion 11. The sealing portion 11 seals the discharge space 6a. The electrode shaft 8 is supported by the sealing portion 11. The metal foil 10 is provided on the sealing portion 11. The metal foil 10 is electrically connected to the electrode shaft 8. The lead 12 is provided on the sealing portion 11. The lead 12 is electrically connected to the metal foil 10. The metal foil 10 includes a first joint portion 16 and a second joint portion 17. The first joint portion 16 is joined to the outer peripheral surface of the electrode shaft 8. The second joint portion 17 is joined to the outer peripheral surface of the lead wire 12. At the first joint portion 16, between the outer peripheral surface of the electrode shaft 8 and the metal foil 10, a joint auxiliary metal material 18 having a lower melting point than the electrode shaft 8 and the metal foil 10 is disposed, and has a seal portion 11 formed therein. The gap G surrounded by the material 11a, the electrode shaft 8, and the metal foil 10, in the gap G, the joint auxiliary metal material 18 is not in contact with the forming material 11a.

Further, in the discharge lamp 5 of the embodiment described below, the first joint portion 16 includes the fusion portion 19, and the depth of the molten portion 19 formed in the electrode shaft 8 or the lead 12 in the thickness direction of the metal foil 10 is set to When d [mm] is set to t [mm] with respect to the thickness of the electrode shaft 8 in the thickness direction of the metal foil 10, 0.01 ≦(d/t) ≦ 0.30 is satisfied.

In addition, when the width of the bonding auxiliary metal material 18 in the direction orthogonal to the axial direction of the electrode shaft 8 and orthogonal to the thickness direction of the metal foil 10 is W1 [mm], it will be relative to the electrode shaft 8. When the width of the electrode shaft 8 in the direction orthogonal to the thickness direction of the metal foil 10 is W2 [mm], the first joint portion 16 of the discharge lamp 5 of the embodiment described below satisfies W1≦. W2.

Further, the discharge lamp 5 of the embodiment described below includes the arc tube 6, the electrode shaft 8, the metal foil 10, and the lead 12. The light-emitting tube 6 includes a sealing portion 11. The sealing portion 11 seals the discharge space 6a. The electrode shaft 8 is supported by the sealing portion 11. The metal foil 10 is provided on the sealing portion 11. The metal foil 10 is electrically connected to the electrode shaft 8. The lead 12 is provided on the sealing portion 11. The lead 12 is electrically connected to the metal foil 10. The metal foil 10 includes a first joint portion 16 and a second joint portion 17. The first joint portion 16 is joined to the outer peripheral surface of the electrode shaft 8. The second joint portion 17 is joined to the outer peripheral surface of the lead wire 12. At the second joint portion 17, between the outer peripheral surface of the lead 12 and the metal foil 10, a joint auxiliary metal material 18 having a lower melting point than the lead 12 and the metal foil 10 is disposed, and the forming material 11a of the seal portion 11 is provided. The gap G surrounded by the lead 12 and the metal foil 10 is in the gap G, and the bonding auxiliary metal material 18 is not in contact with the forming material 11a.

Further, in the discharge lamp 5 of the embodiment described below, the second joint portion 17 includes the molten portion 19, and the depth of the molten portion 19 formed in the thickness direction of the metal foil 10 in the lead portion 12 is set to d [mm] When the thickness of the lead 12 in the thickness direction of the metal foil 10 is t [mm], 0.01 ≦ (d/t) ≦ 0.30 is satisfied.

In addition, when the width of the bonding auxiliary metal material 18 in the direction orthogonal to the axial direction of the lead 12 and perpendicular to the thickness direction of the metal foil 10 is W1 [mm], the axial direction with respect to the lead 12 will be When the width of the lead 12 orthogonal to the thickness direction of the metal foil 10 is W2 [mm], the second joint portion 17 of the discharge lamp 5 of the embodiment described below satisfies W1 ≦ W2.

Further, the bonding auxiliary metal material 18 in the discharge lamp 5 of the embodiment described below is formed in a foil shape.

(Embodiment) Hereinafter, a long arc type discharge lamp (hereinafter simply referred to as a "discharge lamp") according to an embodiment will be described with reference to the drawings. FIG. 1 is a schematic view showing a discharge lamp 5 of an embodiment. As shown in Fig. 1, the discharge lamp 5 of the embodiment is attached to, for example, the mounting portion 3 included in the ultraviolet irradiation device 1 to emit ultraviolet rays to the object to be irradiated. The mounting portion 3 includes a pair of holding members 4 that hold the discharge lamp 5, and a pair of holder members 13 to be described later included in the discharge lamp 5 are held by the pair of holding members 4.

(Configuration of Discharge Lamp) The discharge lamp 5 of the present embodiment is a long arc type mercury lamp or a long arc type metal halide lamp, and is a so-called high intensity discharge lamp (HID: High Intensity Discharge lamp). ). As shown in FIG. 1, the discharge lamp 5 includes an arc tube 6, a cap member 13, and a connecting wire 14.

The arc tube 6 is formed in a cylindrical shape by quartz glass having light transmissivity, and includes a discharge space 6a inside. In the interior of the discharge space 6a, for example, mercury having a argon gas or a high vapor pressure is sealed, and in addition, a metal halide such as iron, tin or iodine is sealed.

As shown in Fig. 1, a pair of electrodes 7 are provided at both ends of the discharge space 6a of the arc tube 6. Fig. 2 is a plan view showing the vicinity of a sealing portion of the discharge lamp 5 of the embodiment. As shown in FIG. 2, the electrode 7 includes an electrode shaft 8 and a coil 9. One end side of the electrode shaft 8 faces the discharge space 6a side, and one end portion is provided in the discharge space 6a. The other end of the electrode shaft 8 is welded and joined to the metal foil 10. The coil 9 is wound around the outer peripheral surface of one end portion of the electrode shaft 8, and is disposed in the discharge space 6a. The electrode shaft 8 and the coil 9 are formed of a metal material containing tungsten as a main component.

As shown in FIGS. 1 and 2, sealing portions 11 for sealing the discharge space 6a are provided at both end portions of the arc tube 6. The sealing portion 11 is a cylindrical shrink seal portion formed by a so-called shrink seal that seals both end portions of the arc tube 6 by heat shrinkage (reduction in diameter).

As shown in FIG. 2, the metal foil 10 is embedded in the inside of the sealing portion 11, and the other end of the electrode shaft 8 and one end portion of the metal foil 10 and the lead wire (wire) 12 are sealed by a forming material 11a, that is, quartz glass. The metal foil 10 is formed, for example, in a rectangular shape from molybdenum, and is formed, for example, to have a length of about 30 mm with respect to the longitudinal direction of the arc tube 6, a width of about 6 mm, and a thickness of about 0.028 mm. Further, the outer peripheral surface of one end portion of the lead 12 is welded and joined to the other end portion of the metal foil 10.

Therefore, the metal foil 10 includes the first joint portion 16 joined to the outer peripheral surface of the electrode shaft 8 and the second joint portion 17 joined to the outer peripheral surface of the lead wire 12. The first joint portion 16 and the second joint portion 17 will be described later.

Further, the other end portion of the lead 12 joined to the metal foil 10 protrudes from the sealing portion 11. Further, as shown in FIG. 1, a cylindrical cap member 13 is provided on the outer peripheral portion of the sealing portion 11. The cap member 13 is joined to the sealing portion 11 of the arc tube 6 by an adhesive.

The connecting wire 14 is disposed outside the arc tube 6, and one end portion is connected to the other end portion of the lead wire 12 that protrudes from the sealing portion 11. One end of the connecting wire 14 is connected to the other end of the lead 12 by, for example, a connecting portion (not shown) formed by soldering. Then, when the discharge lamp 5 is attached to the mounting portion 3 of the ultraviolet irradiation device 1, the cap member 13 is held by the pair of holding members 4 provided in the mounting portion 3, and the connecting wire 14 is connected to the power source portion (not shown). .

3 is a cross-sectional view showing the first joint portion 16 and the second joint portion 17 of the metal foil 10 in the discharge lamp 5 of the embodiment. The first joint portion 16 and the second joint portion 17 include joint auxiliary metal materials 18 disposed between the surface of the metal foil 10 and the outer peripheral surface of the electrode shaft 8, and the surface and lead of the metal foil 10, respectively. Between the outer peripheral faces of 12. The bonding auxiliary metal material 18 is a metal material formed into a rectangular foil shape (film shape) and having a lower melting point than the electrode shaft 8, the lead 12, and the metal foil 10. For example, a platinum having a lower melting point than the molybdenum forming the metal foil 10 and the tungsten forming the electrode shaft 8 and the lead 12 can be used as the bonding auxiliary metal material 18.

The bonding auxiliary metal material 18 is more easily melted than the metal foil 10, the electrode shaft 8, and the lead 12, and therefore becomes the fusion portion 19 forming the first joint portion 16 and the second joint portion 17, the first joint portion 16 and the second joint portion The output of the laser beam required for the welding of 17 is suppressed to be small. Therefore, the weld marks generated in the first joint portion 16 and the second joint portion 17 are suppressed to be small, and cracks in the seal portion 11 due to the weld marks can be suppressed.

Here, the molten portion 19 is a portion obtained by melting a base material (welded metal) in a welded portion which is a portion including a weld metal (base material) and a heat-affected portion. Further, in the present embodiment, the first joint portion 16 and the second joint portion 17 are both welded using the joint auxiliary metal material 18, but only one of the first joint portion 16 and the second joint portion 17 may be joined. The portion is welded using the joint auxiliary metal material 18.

By using the foil-shaped bonding auxiliary metal material 18 and disposing the bonding auxiliary metal material 18 on the surface of the metal foil 10, it is possible to easily arrange a predetermined amount (volume) of the bonding auxiliary metal material 18 to the metal foil. A predetermined position between the surface of 10 and the outer peripheral surface of the electrode shaft 8, and between the surface of the metal foil 10 and the outer peripheral surface of the lead 12. Therefore, the foil-shaped joint auxiliary metal material 18 suppresses the unevenness of the relative position or size of the joint auxiliary metal material 18 with respect to the metal foil 10, the electrode shaft 8, and the lead 12, so that the fusion portion 19 can be accurately performed. The position and size are controlled. Therefore, the weld marks generated in the first joint portion 16 and the second joint portion 17 are suppressed to be small, and cracks in the seal portion 11 due to the weld marks can be suppressed.

As shown in FIG. 3, the first bonding portion 16 and the second bonding portion 17 are irradiated with a laser beam from the side of the metal foil 10 in the thickness direction of the metal foil 10 by using the laser light irradiation head 20 disposed to face the metal foil 10. The light beam is melted by a part of the metal foil 10 and the electrode shaft 8 (lead 12) which are joined to the auxiliary metal material 18, thereby forming the molten portion 19. In the thickness direction of the metal foil 10, the first bonding portion 16 and the second bonding portion 17 are irradiated with a laser beam from the side of the metal foil 10 which is close to the bonding auxiliary metal material 18, thereby bonding the auxiliary metal. The material 18 is rapidly melted to become the fusion portion 19, and therefore, the output of the laser beam required for welding the first joint portion 16 and the second joint portion 17 is suppressed to be small.

4 is a plan view showing the first joint portion 16 and the second joint portion 17 of the metal foil 10 in the discharge lamp 5 of the embodiment. As shown in FIG. 4, the first joint portion 16 and the second joint portion 17 form a melting portion 19 at a plurality of portions spaced apart along the axial direction of the electrode shaft 8 (lead 12) by spot welding. . Further, the first joint portion 16 and the second joint portion 17 are not limited to the use of spot welding, and seam welding in which the melt portion 19 is linearly extended may be used.

(First joint portion and second joint portion in the sealing portion of the discharge lamp) Fig. 5 is a cross-sectional view showing the seal portion 11 of the discharge lamp 5 of the embodiment, taken along the line A-A in Fig. 2 . When the first joint portion 16 is sealed by the sealing portion 11, as shown in FIG. 5, the surface of the metal foil 10 and the outer peripheral surface of the electrode shaft 8 are formed in a cross section orthogonal to the axial direction of the electrode shaft 8. The two corner portions of the two sides form a gap G surrounded by the forming material 11a of the sealing portion 11 along the axial direction of the electrode shaft 8.

Further, in the first joint portion 16, the joint auxiliary metal material 18 including the molten portion 19 and the forming material are contained in the gap G surrounded by the forming material 11a of the sealing portion 11, the outer peripheral surface of the electrode shaft 8, and the surface of the metal foil 10. 11a does not touch. Further, similarly to the first joint portion 16, the second joint portion 17 has a gap G surrounded by the forming material 11a of the seal portion 11, the outer peripheral surface of the lead 12, and the surface of the metal foil 10, and the joint assist in the gap G The metal material 18 is not in contact with the forming material 11a. In other words, since the molten portion 19 does not contact the forming material 11a in the gap G, it is possible to suppress cracking of the forming material 11a due to the weld mark of the molten portion 19 when the sealing portion 11 is thermally deformed.

In addition, as shown in FIG. 3, the width of the bonding auxiliary metal material 18 in the direction orthogonal to the axial direction (longitudinal direction) of the electrode shaft 8 and orthogonal to the thickness direction of the metal foil 10 is set to W1 [mm When the width of the electrode shaft 8 orthogonal to the axial direction of the electrode shaft 8 and perpendicular to the thickness direction of the metal foil 10 is W2 [mm], the first joint portion 16 satisfies W1 ≦ W2 ... (Formula 1) When the cross section of the electrode shaft 8 is formed in a circular shape, the width W2 of the electrode shaft 8 means a diameter.

Similarly to the first bonding portion 16, the width of the bonding auxiliary metal material 18 in the direction orthogonal to the axial direction (longitudinal direction) of the lead 12 and perpendicular to the thickness direction of the metal foil 10 is set to W1 [mm When the width of the lead 12 orthogonal to the axial direction of the lead 12 and perpendicular to the thickness direction of the metal foil 10 is W2 [mm], the second joint portion 17 satisfies Formula 1. Further, in the case where the cross section of the lead 12 is formed into a circular shape, the width W2 of the lead 12 means a diameter.

The first joint portion 16 and the second joint portion 17 satisfy the formula 1, whereby the joint auxiliary metal material 18 can be properly disposed in the gap G of the seal portion 11, and the joint auxiliary metal material 18 and the forming material 11a can be easily suppressed. Contact in the gap G.

Further, as shown in FIG. 3, the first joint portion 16 includes a melting portion 19, and the depth of the molten portion 19 formed in the thickness direction of the metal foil 10 in the electrode shaft 8 is set to d [mm], which is relative to the metal. When the thickness of the electrode shaft 8 in the thickness direction of the foil 10 is t [mm], 0.01 ≦(d/t) ≦ 0.30 is satisfied. (Expression 2) When the cross section of the electrode shaft 8 is formed into a circular shape, the electrode shaft The thickness t of 8 means the diameter.

Similarly to the first joint portion 16, the second joint portion 17 includes the melt portion 19, and the depth of the molten portion 19 formed in the thickness direction of the metal foil 10 in the lead portion 12 is set to d [mm], which is relative to the metal. When the thickness of the lead 12 in the thickness direction of the foil 10 is t [mm], the formula 2 is satisfied. In the case where the cross section of the lead 12 is formed into a circular shape, the thickness t of the lead 12 means a diameter.

The depth d of the molten portion 19 refers to the depth from the contact surface between the electrode shaft 8 or the lead 12 and the metal foil 10 in the thickness direction of the metal foil 10. The value of d/t satisfies the formula 2, whereby both the joint strength (tensile strength) and the bending strength (bending strength) of the first joint portion 16 and the second joint portion 17 can be appropriately ensured. Here, the bending strength refers to the force required to bend or break the material of the test object.

FIG. 6 is a view for explaining the joint strength and the bending strength of the first joint portion 16 and the second joint portion 17 of the metal foil 10 in the discharge lamp 5 of the embodiment. The vertical axis in Fig. 6 indicates the joint strength [N] and the bending strength [N], and the broken line indicates the target 20 [N]. The horizontal axis in Fig. 6 indicates the value of d/t. In addition, in FIG. 6, the solid line shows the joint strength, and the chain line indicates the bending strength.

As shown in FIG. 6, if the value of d/t is less than 0.01, the joint strength is less than 20 [N]. On the other hand, if the value of d/t is more than 0.30, the bending strength is less than 20 [N]. Therefore, the depth d of the molten portion 19 and the thickness t of the electrode shaft 8 (lead 12) are set so that the value of d/t is in the range of 0.01 or more and 0.30 or less, whereby the joint strength can be ensured. Both the bending strength and the bending strength are 20 [N] or more.

FIG. 7 is a schematic view for explaining a method of measuring the joint strength between the first joint portion 16 and the second joint portion 17 of the metal foil 10 in the discharge lamp 5 of the embodiment. FIG. 8 is a schematic view for explaining a method of measuring the bending strength of the first joint portion 16 and the second joint portion 17 of the metal foil 10 in the discharge lamp 5 of the embodiment. The joint strength and the flexural strength were measured using a tensile compression tester (TG-2KN) manufactured by Minebean.

As shown in FIG. 7, the joint strength was measured using the clamp jig 22 fixed to the mounting portion 21 and the clamp member 23. When the electrode shaft 8 is held by the clamp jig 22 and the lead 12 is held by the clamp member 23, the clamp member 23 is moved in the axial direction of the lead 12. Thus, the joint strength is measured by a so-called tensile test in which the tensile load F is applied to the first joint portion 16 and the second joint portion 17.

As shown in Fig. 8, the bending strength is measured using a clamp jig 22 fixed to the mounting portion 21 and an indenter 24. 8 is a view showing a state in which the bending strength of the first joint portion 16 is measured in a state where the metal foil 10 is peeled off from the electrode shaft 8 with respect to the first joint portion 16, and the electrode shaft is held by the clamp jig 22 In the state of 8, the end portion of the electrode shaft 8 corresponding to the first joint portion 16 is pressed by the ram 24 in a direction crossing the axial direction of the electrode shaft 8. Thus, the bending strength is measured by a so-called bending test in which the bending load F is applied to the first joint portion 16.

As described above, the metal foil 10 in the discharge lamp 5 of the embodiment includes the first joint portion 16 joined to the outer peripheral surface of the electrode shaft 8, and the second joint portion 17 joined to the outer peripheral surface of the lead 12. At the first joint portion 16, between the outer peripheral surface of the electrode shaft 8 and the metal foil 10, a joint auxiliary metal material 18 having a lower melting point than the electrode shaft 8 and the metal foil 10 is disposed, and has a seal portion 11 formed therein. The gap G surrounded by the material 11a, the electrode shaft 8, and the metal foil 10, in the gap G, the joint auxiliary metal material 18 is not in contact with the forming material 11a. At the second joint portion 17, between the outer peripheral surface of the lead 12 and the metal foil 10, a joint auxiliary metal material 18 having a lower melting point than the lead 12 and the metal foil 10 is disposed, and the forming material 11a of the seal portion 11 is provided. The gap G surrounded by the lead 12 and the metal foil 10 is in the gap G, and the bonding auxiliary metal material 18 is not in contact with the forming material 11a. Thereby, the weld marks generated in the first joint portion 16 and the second joint portion 17 can be suppressed to be small, so that the first joint portion 16 and the metal foil 10 between the metal foil 10 and the electrode shaft 8 can be suppressed. A crack is generated in the forming material 11a of the sealing portion 11 of the second joint portion 17 between the leads 12. As a result, cracking cracks can be suppressed in the sealing portion 11, and therefore, the reliability of the sealing state of the sealing portion 11 can be improved.

In addition, when the depth of the molten portion 19 formed in the electrode shaft 8 is d [mm] and the thickness of the electrode shaft 8 is t [mm], the first joint portion 16 in the discharge lamp 5 of the embodiment is satisfied. 0.01 ≦ (d / t) ≦ 0.30 (Formula 2). Further, when the depth of the fusion portion 19 formed on the lead 12 is d [mm] and the thickness of the lead 12 is t [mm], the second joint portion 17 satisfies Formula 2. Thereby, both the joint strength and the bending strength of the first joint portion 16 and the second joint portion 17 can be appropriately ensured.

In addition, when the width of the bonding auxiliary metal material 18 in the direction orthogonal to the axial direction of the electrode shaft 8 and orthogonal to the thickness direction of the metal foil 10 is W1 [mm], it will be relative to the electrode shaft 8. When the width of the electrode shaft 8 in the direction orthogonal to the thickness direction of the metal foil 10 is W2 [mm], the first joint portion 16 of the discharge lamp 5 of the embodiment satisfies W1 ≦ W2 (formula) 1). In addition, when the width of the bonding auxiliary metal material 18 in the direction orthogonal to the axial direction of the lead 12 and perpendicular to the thickness direction of the metal foil 10 is W1 [mm], the axial direction with respect to the lead 12 will be When the width of the lead 12 orthogonal to the direction perpendicular to the thickness direction of the metal foil 10 is W2 [mm], the second joint portion 17 satisfies Formula 1. With this configuration, the bonding auxiliary metal material 18 can be appropriately disposed in the gap G of the sealing portion 11, and the bonding auxiliary metal material 18 can be easily prevented from coming into contact with the forming material 11a in the gap G. Therefore, formation of the sealing portion 11 can be suppressed. The material 11a is cracked.

Further, the bonding auxiliary metal material 18 in the discharge lamp 5 of the embodiment is formed in a foil shape. With this configuration, it is possible to easily arrange a predetermined amount of the joint auxiliary metal material 18 at a predetermined position, and the unevenness of the relative position or size of the joint auxiliary metal material 18 is suppressed. Therefore, the position and size of the molten portion 19 can be accurately performed. Take control. Therefore, the weld marks generated in the first joint portion 16 and the second joint portion 17 are suppressed to be small, and cracks in the seal portion 11 due to the weld marks can be suppressed.

The embodiments of the present invention have been described, but the embodiments are presented as examples, and are not intended to limit the scope of the invention. The embodiment can be implemented in various other forms, and various omissions, substitutions and changes can be made without departing from the scope of the invention. The scope of the invention and the scope of the invention are intended to be included within the scope of the invention and the scope of the invention.

1‧‧‧UV irradiation device

3, 21‧‧‧ Installation Department

4‧‧‧Holding parts

5‧‧‧Discharge lamp

6‧‧‧Light tube

6a‧‧‧Discharge space

7‧‧‧Electrode

8‧‧‧Electrode shaft

9‧‧‧ coil

10‧‧‧metal foil

11‧‧‧ Sealing Department

11a‧‧‧Forming materials

12‧‧‧ leads

13‧‧‧Lighting parts

14‧‧‧Connecting line

16‧‧‧First joint

17‧‧‧Second joint

18‧‧‧Joining auxiliary metal materials

19‧‧‧The Ministry of Fusion

20‧‧‧Laser light head

22‧‧‧Clamping fixture

23‧‧‧Clamping parts

24‧‧‧Indenter

A-A‧‧‧ profile

D‧‧‧depth

F‧‧‧ tensile load, bending load

G‧‧‧ gap

T‧‧‧thickness

W1, W2‧‧‧ width

Fig. 1 is a schematic view showing a discharge lamp of an embodiment. Fig. 2 is a plan view showing the vicinity of a sealing portion of the discharge lamp of the embodiment. 3 is a cross-sectional view showing a joint portion of a metal foil in a discharge lamp according to an embodiment. 4 is a plan view showing a joint portion of a metal foil in a discharge lamp according to an embodiment. Fig. 5 is a cross-sectional view showing a sealing portion of a discharge lamp according to an embodiment, taken along a line A-A in Fig. 2; FIG. 6 is a view for explaining the joint strength and the bending strength of the joint portion of the metal foil in the discharge lamp of the embodiment. FIG. 7 is a schematic view for explaining a method of measuring the joint strength of the joint portion of the metal foil in the discharge lamp of the embodiment. FIG. 8 is a schematic view for explaining a method of measuring the bending strength of the joint portion of the metal foil in the discharge lamp of the embodiment.

Claims (8)

A discharge lamp, comprising: an arc tube comprising a sealing portion for sealing a discharge space; an electrode shaft supported by the sealing portion; a metal foil disposed on the sealing portion and electrically connected to the electrode shaft And a lead wire provided on the sealing portion and electrically connected to the metal foil, the metal foil including a first joint portion joined to an outer circumferential surface of the electrode shaft, and a joint surface with the outer circumferential surface of the lead wire In the second joint portion, a joint auxiliary metal material having a lower melting point than the electrode shaft and the metal foil is disposed between the outer peripheral surface of the electrode shaft and the metal foil. And having a void surrounded by the forming material of the sealing portion, the electrode shaft, and the metal foil, in which the bonding auxiliary metal material is not in contact with the forming material. The discharge lamp according to claim 1, wherein the first joint portion includes a melting portion, and a depth of the melting portion formed in the electrode shaft in a thickness direction of the metal foil is set When the thickness of the electrode axis with respect to the thickness direction of the metal foil is t mm, it is 0.01 mm (d/t) ≦ 0.30. The discharge lamp according to claim 1 or 2, wherein the bonding is performed in a direction orthogonal to an axial direction of the electrode shaft and orthogonal to a thickness direction of the metal foil. The width of the auxiliary metal material is set to be W1 mm, and the width of the electrode shaft in a direction orthogonal to the axial direction of the electrode axis and perpendicular to the thickness direction of the metal foil is set to W2 mm. The first joint portion satisfies W1≦W2. The discharge lamp according to claim 1 or 2, wherein the joint auxiliary metal material is formed in a foil shape. A discharge lamp, comprising: an arc tube comprising a sealing portion for sealing a discharge space; an electrode shaft supported by the sealing portion; a metal foil disposed on the sealing portion and electrically connected to the electrode shaft And a lead wire provided on the sealing portion and electrically connected to the metal foil, the metal foil including a first joint portion joined to an outer circumferential surface of the electrode shaft, and a joint surface with the outer circumferential surface of the lead wire In the second bonding portion, a bonding auxiliary metal material having a lower melting point than the lead wire and the metal foil is disposed between the outer peripheral surface of the lead and the metal foil, and has A void surrounded by the forming material of the sealing portion, the lead, and the metal foil, the bonding auxiliary metal material is not in contact with the forming material in the void. The discharge lamp according to claim 5, wherein the second joint portion includes a melting portion, and a depth of the molten portion formed in the thickness direction of the metal foil in the lead wire is set to d mm satisfies 0.01 ≦(d/t) ≦ 0.30 when the thickness of the lead wire in the thickness direction of the metal foil is t mm. The discharge lamp according to claim 5, wherein the bonding assist is performed in a direction orthogonal to an axial direction of the lead and orthogonal to a thickness direction of the metal foil. The width of the metal material is set to W1 mm, and the width of the lead wire orthogonal to the axial direction of the lead wire and perpendicular to the thickness direction of the metal foil is set to W2 mm, and the second The joint satisfies W1≦W2. The discharge lamp according to Item 5 or 6, wherein the joint auxiliary metal material is formed in a foil shape.