JP2012043542A - Metal halide lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a metal halide lamp in which an arc tube is securely and airtightly sealed and a power supply member supporting an electrode rod is positioned with high precision.SOLUTION: The metal halide lamp includes: an arc tube 11 which comprises a translucent light emitting part 11a housing mercury and metal halide inside, and a side tube part 11b formed at both side parts of the light emitting part respectively and which is made of a ceramic material; a power supply member 14 which is inserted into the respective side tube parts, and includes an end on the light emitting part side which is connected to an electrode rod 12, and has the other side end connected to a lead wire 13; and a cylindrical power supply member positioning tool 15 which is fixed to a periphery of the lead wire; and a sealing material 16 which airtightly seals a gap part between an outer peripheral surface of the power supply member and the side tube part. The positioning tool 15 is formed of niobium or niobium alloy, a bottom face 15b of the positioning tool faces an end face 11c of the side tube part, and the sealing material 16 extends from the gap part to a gap part between an inner peripheral surface of the positioning tool and an outer peripheral surface of the lead wire and then to the entire opposition surface between the bottom face of the positioning tool and the end face of the side tube part.

Description

  The present invention relates to a metal halide lamp that can be used particularly advantageously as a light source of a lighting device for a stage or a photography studio.

  A metal halide lamp (sometimes called a metal halide discharge lamp) has an emission color close to that of sunlight and has an advantage of higher brightness than a halogen lamp. It is widely used as a light source or as a light source for lighting devices in buildings such as hotels and restaurants.

  The metal halide lamp swells in a central region, and includes a light-transmitting light-emitting portion that contains mercury and metal halide inside, and a side tube portion formed on each side of the light-emitting portion. A feeding member inserted into each of the side tube portions, an electrode rod connected to an end portion on the light emitting portion side, and an end portion on the other side connected to a lead wire, and an outer peripheral surface of each feeding member It is comprised from the sealing material which seals the clearance gap formed between the side pipe parts in an airtight state.

  By supplying electric energy to the pair of electrode rods provided in the metal halide lamp via the power supply member and the lead wire, respectively, arc discharge occurs between these electrode rods, and the light emission of this discharge is used for illumination. The

  It is known to form arc tubes from ceramic materials. This is because the ceramic material has a chemically stable property with respect to the metal halide accommodated in the arc tube.

  The gap formed between the side tube portion of the ceramic arc tube and the outer peripheral surface of the power supply member accommodated therein is a sealing material so that mercury and metal halide do not leak outside the arc tube. Is sealed in an airtight state. At the time of sealing, in order to stabilize the quality of the metal halide lamp (for example, to suppress fluctuations in the emission color), each power supply member is positioned, and the electrode rod supported by the power supply member is accurately positioned at a predetermined position. It is preferable to arrange.

  Patent Document 1 (FIG. 2) discloses a metal halide lamp in which a stepped cap 10 is fixed around a power supply lead (lead wire) 8. The stepped cap 10 is formed of, for example, niobium, and the position of the electrode assembly 4 (a structure including the electrode 5, the intermediate material 6, the cermet 7, and the lead 8) inserted into the capillary (side tube portion) 3. To regulate. The stepped cap 10 includes a thick cylindrical portion 11 surrounding the end of the capillary.

  In Patent Document 2 (FIG. 1), a head portion 9 having a size capable of contacting the end face of the capillary 2 is integrally formed on the top of a cermet (power feeding member) 6 accommodated in the capillary (side tube portion) 2. A metal halide lamp is disclosed. The head assembly 9 positions the electrode assembly 3 (a structure including the electrode 4, the intermediate member 5, the cermet 6, and the lead 7).

  The head portion 9 is formed with an insertion hole 11 for the lead 7 and a slit groove 13. In a state where the head portion 9 is disposed in contact with the end face of the capillary 2, a melt of sealing glass is poured into the slit groove 13 to form the outer surface of the cermet 6 and the capillary 2. The gap portion and the gap portion between the insertion hole 11 of the head portion 9 and the outer peripheral surface of the lead 7 are each sealed in an airtight state by sealing glass.

JP2009-129875A (FIG. 2) JP 2009-231220 A (FIG. 1)

  An object of the present invention is to provide a metal halide lamp in which an arc tube is surely hermetically sealed and a power supply member supporting an electrode rod is positioned with high accuracy.

  The present invention relates to a ceramic material comprising a translucent light emitting portion that swells in a central region and contains mercury and metal halide therein, and side tube portions formed on both sides of the light emitting portion. A power supply member inserted in each of the light emitting tube and the side tube portion, an electrode rod connected to an end portion on the light emitting portion side, and an end portion on the other side connected to a lead wire, a power supply member for the lead wire A metal halide lamp including a cylindrical power supply member positioning tool fixed around a position adjacent to the power supply member, and a sealing material that seals a gap formed between the outer peripheral surface of the power supply member and the side tube portion in an airtight state The cylindrical power supply member positioning tool is formed from niobium or a niobium alloy, the bottom surface of the cylindrical power supply member positioning tool is opposed to the end surface of the side tube portion, and the sealing material, Formed between the outer peripheral surface of the power supply member and the side tube. The gap between the inner peripheral surface of the cylindrical power supply member positioning tool and the outer peripheral surface of the lead wire, and the entire opposing surface between the bottom surface of the cylindrical power supply member positioning tool and the end surface of the side tube. The metal halide lamp is characterized by

  In the metal halide lamp of the present invention, the inner peripheral portion of the cylindrical power supply member positioning tool has a small-diameter inner peripheral portion on the top surface side that substantially matches the outer peripheral diameter of the lead wire, and a bottom-surface side that has a larger diameter than the small-diameter inner peripheral portion. It is preferable to include a large-diameter inner peripheral portion. More preferably, the outer diameter of the cylindrical portion around the small-diameter inner peripheral portion of the cylindrical power supply member positioning tool is smaller than the outer diameter of the cylindrical portion around the large-diameter inner peripheral portion.

The present invention also resides in a method for manufacturing the metal halide lamp including the following steps (1) to (3).
(1) Mercury and metal halide, a light-emitting tube made of a ceramic material composed of a translucent light-emitting portion that bulges in the central region, and side tube portions formed on both sides of the light-emitting portion, A pair of power supply members with electrode rods connected to the ends and the other end connected to the lead wires, formed of niobium or a niobium alloy fixed at a position close to the power supply members of the respective lead wires A step of preparing a cylindrical power supply member positioning tool and a pair of sealing material molded bodies molded in an annular shape.
(2) A power supply member to which the lead wire to which the cylindrical power supply member positioning tool is fixed and the electrode rod are connected is formed from the electrode rod side into the sealing material molded body formed in an annular shape, and then the arc tube side The process which inserts in a pipe part and arrange | positions in the position which the end surface of a side pipe part and the bottom face of a cylindrical feeding member positioning tool oppose and contact via a sealing material molding.
(3) By supplying thermal energy around the cylindrical power supply member positioning tool, the sealing material molded body is melted, and then this melt is formed between the outer peripheral surface of the power supply member and the side tube portion. After moving to the gap between the inner peripheral surface of the cylindrical power supply member positioning tool and the outer peripheral surface of the lead wire, and the entire opposing surface between the bottom surface of the cylindrical power supply member positioning tool and the side tube end face, Cooling step.

  In the present specification, “translucency” means that the transmittance of light having a wavelength in the range of 400 to 4000 nm is 70% or more.

  In the metal halide lamp of the present invention, the arc tube is surely hermetically sealed by the cylindrical power supply member positioning tool having a simple configuration, and the power supply member supporting the electrode rod is positioned with high accuracy.

It is sectional drawing which shows the structural example of the metal halide lamp of this invention. It is an enlarged view of the site | part of the vicinity of the cylindrical electric power feeding member positioning tool 15 of the metal halide lamp 10 of FIG. It is sectional drawing of the metal halide lamp 10 cut | disconnected along the cutting line III-III line entered in FIG. When manufacturing the metal halide lamp 10 shown in FIGS. 1 to 3, the power supply member 14 is opposed to the end surface 11 c of the side tube portion 11 b and the bottom surface 15 b of the cylindrical power supply member positioning tool 15 through the sealing material molding 26. It is a figure which shows the state arrange | positioned in the position which contacts. It is an expanded sectional view which shows another structural example of the metal halide lamp of this invention. It is an expanded sectional view which shows another structural example of the metal halide lamp of this invention. It is an expanded sectional view which shows another structural example of the metal halide lamp of this invention.

  The metal halide lamp of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a cross-sectional view showing a configuration example of a metal halide lamp of the present invention. FIG. 2 is an enlarged view of a portion in the vicinity of the cylindrical power supply member positioning tool 15 of the metal halide lamp 10 of FIG. 3 is a cross-sectional view of the metal halide lamp 10 cut along the cutting line III-III entered in FIG. The metal halide lamp 10 shown in FIGS. 1 and 2 shows only the arc tube 11, the cylindrical power supply member positioning tool 15, and the sealing material 16 in cross section (the same applies to FIGS. 5 to 7 later). is there).

  The metal halide lamp 10 shown in FIG. 1 to FIG. 3 is formed on each of the translucent light emitting portion 11a that swells in the central region and accommodates mercury and metal halide inside, and on both sides of the light emitting portion 11a. A light emitting tube 11 made of a ceramic material composed of a side tube portion 11b, and an electrode rod 12 connected to an end portion on the light emitting portion 11a side inserted into each side tube portion 11b, and an end on the other side The power supply member 14 whose part is connected to the lead wire 13, the cylindrical power supply member positioning tool 15 fixed around the position near the power supply member 14 of the lead wire 13, and the outer peripheral surface of the power supply member 14 and the side tube portion 11b It is comprised from the sealing material 16 which seals the clearance gap formed between these in an airtight state.

  In the metal halide lamp 10, the cylindrical power supply member positioning tool 15 is made of niobium, the bottom surface 15b of the cylindrical power supply member positioning tool 15 is opposed to the end surface 11c of the side tube portion 11b, and the sealing material 16 is a gap between the inner peripheral surface 15c of the cylindrical power supply member positioning tool 15 and the outer peripheral surface 13a of the lead wire 13 from a gap formed between the outer peripheral surface 14a of the power supply member 14 and the side tube portion 11b. In addition, the cylindrical power feeding member positioning tool 15 is characterized in that it extends to the entire facing surface between the bottom surface 15b and the side tube portion end surface 11c.

  The arc tube (bulb) 11 is composed of a light emitting portion (tubular sticking portion) 11a and side tube portions 11b on both sides thereof. The arc tube 11 is made of a ceramic material typified by alumina, for example.

  The light emitting portion 11a and the side tube portion 11b may be configured as independent components. The light emitting unit 11a needs to exhibit translucency in order to extract the light of arc discharge generated inside.

  Mercury and metal halide are accommodated in the light emitting part 11a. Examples of metal halides include compounds of metals such as Na, Tl, Th, In, Sn, Si, Sc, Dy, Ho, and Tm and halogens such as iodine or bromine. The light emitting unit 11a can contain a rare gas such as argon.

  A power feeding member 14 is inserted into each side tube portion 11 b of the arc tube 11. The end of the power supply member 14 on the light emitting part 11 a side is connected to the electrode rod 12, and the end on the other side is connected to the lead wire 13. The electrode rod 12, the power supply member 14, and the lead wire 13 are made of a conductive material.

  The electrode rod 12 is preferably formed from a metal or alloy that is chemically stable with respect to the halogen contained in the light-emitting portion, and typical examples thereof include tungsten and molybdenum.

  A gap formed between the outer peripheral surface 14 a of the power supply member 14 and the side tube portion 11 b is sealed in an airtight state using the sealing material 16. A known frit glass can be used as the sealing material.

  The side tube portion 11b is provided with radiant heat of arc discharge generated when the lamp is turned on, or radiant heat of arc discharge applied to the light emitting portion 11a is transmitted, and becomes high temperature together with the power supply member 14 and the sealing material 16. At this time, if the thermal expansion coefficients of the side tube portion 11b, the power feeding member 14, and the sealing material 16 are greatly different from each other, cracks are generated in the sealing material 16 or the side tube portion 11b due to the thermal stress generated in each of them. There are things to do.

In order to prevent the occurrence of such cracks, as the sealing material 16, a frit glass exhibiting a thermal expansion coefficient approximate to the thermal expansion coefficient of the ceramic material forming the side tube portion 11 b of the arc tube 11, for example, Al ₂ It is preferred to use a mixture of O ₃ , SiO ₂ , and Dy ₂ O ₃ .

  For the same reason, the power supply member 14 is preferably formed from niobium, tantalum, or cermet (a composite material of a metal or alloy and a ceramic material).

  As the ceramic material used for the cermet, it is preferable to use a ceramic material (a typical example, alumina) that forms the side tube portion. For example, the cermet increases the thermal expansion coefficient of the ceramic material forming the side tube portion 11b in a state where the conductivity required for the power supply member 14 is ensured by increasing the content of the ceramic material. Can be adjusted to a value close to. Therefore, as the metal or alloy used for the cermet, it is preferable to use a metal or alloy that is chemically stable to the halogen.

The arc tube 11 (the light emitting portion 11a and the side tube portion 11b) of the metal halide lamp 10 shown in FIGS. 1 to 3 is made of alumina (thermal expansion coefficient: 8.1 × 10 ⁻⁶ / K), and the sealing material 16 Is made of frit glass (thermal expansion coefficient: 6.5 × 10 ⁻⁶ / K) made of a mixture of Al ₂ O ₃ , SiO ₂ , and Dy ₂ O ₃ , and the power supply member 14 is made of molybdenum, alumina, Cermet (thermal expansion coefficient: 7.7 × 10 ⁻⁶ / K).

  A cylindrical power supply member positioning tool (cylindrical power supply member positioning tool) 15 is fixed around the position near the power supply member 14 of the lead wire 13 (around the end of the lead wire 13 on the power supply member 14 side). Has been.

  As shown in FIG. 3, the inner peripheral surface of the through hole 15 a of the cylindrical power supply member positioning tool 15 is in partial contact with the outer peripheral surface of the lead wire 13. The cylindrical power supply member positioning tool 15 and the lead wire 13 are welded and fixed to each other at their contact portions. The inner peripheral surface of the through hole of the cylindrical power supply member positioning tool and the outer peripheral surface of the lead wire may be in close contact with each other without any gap in the circumferential direction.

  As described above, in the metal halide lamp 10, the cylindrical power supply member positioning tool 15 is formed of niobium, and the bottom surface 15b of the cylindrical power supply member positioning tool 15 is opposed to the end surface 11c of the side tube portion 11b. Then, the sealing material 16 extends from the gap formed between the outer peripheral surface 14a of the power supply member 14 and the side tube portion 11b to the outer peripheral surface of the inner peripheral surface 15c of the cylindrical power supply member positioning tool 15 and the lead wire 13. It is characterized in that it extends to the entire gap between the surface 13a and the entire surface facing the bottom surface 15b of the cylindrical power supply member positioning tool 15 and the side tube end surface 11c.

  The cylindrical power supply member positioning tool 15 is made of niobium or a niobium alloy, and dissipates heat from the side tube portion 11b of the arc tube 11 transmitted from the bottom surface 15b side or transmits it to the lead wire 13 to transmit the heat from the side tube portion 11b. Demonstrates the effect of suppressing temperature rise. Niobium or a niobium alloy exhibits a coefficient of thermal expansion that approximates the ceramic material that forms the side tube. For this reason, generation | occurrence | production of the crack in the sealing material between the end surface 11c of the side pipe part 11b and the bottom face 15b of the cylindrical electric power feeding member positioning tool 15 is suppressed.

The cylindrical power supply member positioning tool 15 shown in FIGS. 1 to 3 is made of a niobium alloy (thermal expansion coefficient: 7.1 × 10 ⁻⁶ / K) containing 1% by mass of zirconium. When a niobium alloy containing zirconium is used, machining of the cylindrical power supply member positioning tool 15 is facilitated.

  When the cylindrical power feeding member positioning tool 15 has a configuration in which the bottom surface 15b faces the end surface 11c of the side tube portion 11b, the side tube portion 11b of the arc tube 11 is hermetically sealed as will be described in detail later. When sealing in the state, the retention of the melt of the sealing material (sealing material molding to be described later) between the bottom surface 15b of the cylindrical power supply member positioning tool 15 and the end surface 11c of the side tube portion 11b. It is suppressed. For this reason, the cylindrical power feeding member positioning tool 15 and the side tube portion 11b can be fixed in a state in which they are sufficiently close to each other via the sealing material. Thereby, since the power feeding member 14 supporting the electrode rod 12 is positioned with high accuracy, the quality of the metal halide lamp 10 is stabilized (for example, variation in emission color is suppressed).

  Further, in the metal halide lamp 10, even if the gap formed between the outer peripheral surface 14a of the power supply member 14 and the side tube portion 11b is not sufficiently sealed, the cylindrical power supply member positioning tool is used. 15 by the sealing material extending to the entire gap between the inner peripheral surface 15c of the lead wire 13 and the outer peripheral surface 13a of the lead wire 13 and the opposing surface of the bottom surface 15b of the cylindrical power supply member positioning tool 15 and the side pipe end surface 11c. The arc tube 11 can be reliably hermetically sealed.

  In order to further ensure the hermetic sealing of the arc tube 11, it is more preferable to form the lead wire 13 connected to the power supply member 14 from niobium or a niobium alloy. Thereby, generation | occurrence | production of the crack in the sealing material between the internal peripheral surface 15c of the cylindrical electric power feeding member positioning tool 15 and the outer peripheral surface 13a of the lead wire 13 is suppressed.

  Next, a method for manufacturing the metal halide lamp of the present invention will be described using the metal halide lamp 10 shown in FIGS. 1 to 3 as a representative example.

The manufacturing method of the metal halide lamp 10 is characterized by including the following steps (1) to (3).
(1) An arc tube 11 made of a ceramic material comprising mercury and metal halide, a translucent light emitting portion 11a bulging in the central region, and side tube portions 11b formed on both side portions of the light emitting portion 11a, A pair of power supply members 14 having an electrode rod 12 connected to one end and an end on the other side connected to a lead wire 13, and niobium fixed at a position close to the power supply member 14 of each lead wire 13. Or the process of preparing the cylindrical electric power feeding member positioning tool 15 formed from the niobium alloy, and a pair of sealing material molding (FIG. 4:26) shape | molded cyclically | annularly.

  (2) A sealing member molded body in which the power supply member 14 to which the lead wire 13 to which the cylindrical power supply member positioning tool 15 is fixed and the electrode rod 12 are connected is formed in an annular shape from the electrode rod 12 side, Next, the tube is inserted into the side tube portion 11b of the arc tube 11, and as shown in FIG. 4, the end surface of the side tube portion 11b and the bottom surface 15b of the cylindrical power supply member positioning tool 15 face each other through the sealing material molding 26. The process of arranging at a position.

  (3) By supplying thermal energy to the periphery of the cylindrical power supply member positioning tool 15, the sealing material molded body 26 is melted, and then this melted product is fed to the outer peripheral surface 14a of the power supply member 14 and the side tube portion 11b. A gap formed between the inner peripheral surface 15c of the cylindrical power supply member positioning tool 15 and the outer peripheral surface 13a of the lead wire 13, and a bottom surface of the cylindrical power supply member positioning tool 15. And cooling after moving to the entire surface facing the end surface 11c of the side tube portion 11b.

  In the step (3), the melt of the sealing material molded body is formed between the gap formed between the outer peripheral surface 14a of the power supply member 14 and the side tube portion 11b and the cylindrical power supply member positioning tool 15. Each of the gaps formed between the peripheral surface 15c and the outer peripheral surface 13a of the lead wire 13 gradually moves by capillary action.

  When the molten material of the sealing material molded body 26 moves, the cylindrical power feeding member positioning tool 15 has a cylindrical portion that can cover the outer peripheral surface of the side tube portion 11b on the bottom surface side (for example, the above-mentioned If the portion corresponding to the thick cylindrical portion 11 of the stepped cap 10 of Patent Document 1 is provided, the movement of the melt to the outer peripheral side of the side tube portion 11b is prevented by this cylindrical portion. On the other hand, the amount of the melt that can flow into the gaps per unit time by capillarity is limited. For this reason, the melt of the sealing material molding 26 may stay between the bottom surface 15b of the positioning tool 15 and the end surface 11c of the side tube portion 11b. As a result, the cylindrical power supply member positioning tool 15 and the side tube portion 11b are not sufficiently close to each other via the staying melt, and in an extreme case, the staying melt The positioning tool 15 may be fixed to each other in a state where it is slightly moved upward (opposite to the side of the side tube portion). For this reason, the positioning accuracy of the power supply member 14 supporting the electrode rod 12 may be lowered.

  On the other hand, when the cylindrical power feeding member positioning tool 15 has a bottom surface 15b facing the end surface 11c of the side tube portion 11b (having no cylindrical portion as described above), sealing is performed. The melt of the material molded body 26 includes a gap formed between the outer peripheral surface 14 a of the power supply member 14 and the side tube portion 11 b, the inner peripheral surface 15 c of the cylindrical power supply member positioning tool 15, and the outer periphery of the lead wire 13. Since the melt that cannot move to each gap gradually moves to each of the gaps formed between the surface 13a and the gaps, and smoothly moves to the outer peripheral side of the side pipes, The cylindrical power supply member positioning tool 15 and the side tube portion 11b are fixed in a state in which they are sufficiently close to each other via the melt of the sealing material molding 26. For this reason, the power feeding member 14 supporting the electrode rod 12 is positioned with high accuracy.

  In addition, according to the process of the said process (2) and process (3), the other side tube part with which the arc tube of the metal halide lamp was equipped is also sealed airtight.

  Although there is no restriction | limiting in particular in the order which seals each side tube part 11b of the arc_tube | light_emitting_tube 11, Usually, after sealing one side tube part 11b by implementation of the said process (2) and process (3), the other The side tube portion 11b is sealed according to the above steps (2) and (3). Further, for example, the feeding member 14 is inserted into the one side tube portion 11b of the arc tube 11 by performing the step (2), and then the feeding member 14 is inserted into the other side tube portion 11b according to the step (2). And after sealing said one side pipe part 11b by implementation of the process of said process (3), said other side pipe part can also be sealed according to said process (3). It is also possible to seal both side tube portions 11b of the arc tube 11 at the same time. Further, mercury and metal halide can be accommodated in the light emitting part 11a at an arbitrary timing before the side tube parts 11b of both are sealed.

  FIG. 5 is an enlarged cross-sectional view showing another configuration example of the metal halide lamp of the present invention.

  The configuration of the metal halide lamp 50 in FIG. 5 is such that the inner peripheral portion of the cylindrical power supply member positioning tool 55 has a small-diameter inner peripheral portion 55c on the side of the top surface 55a substantially matching the outer peripheral diameter of the lead wire 13, and a small-diameter inner peripheral portion. 2 is the same as the metal halide lamp 10 of FIG. 2 except that it has a large-diameter inner peripheral portion 55d on the side of the bottom surface 55b having a larger diameter (inner diameter) than 55c.

  In the metal halide lamp 50 of FIG. 5, when the side tube portion 11 b of the arc tube 11 is sealed, the melt of the sealing material molded body is melted by the cylindrical power supply member positioning tool 55 and the side tube portion 11 b. In a state sufficiently close to each other, it is accommodated and held in the large-diameter inner peripheral portion 55d of the cylindrical power supply member positioning tool 55, and then formed between the outer peripheral surface 14a of the power supply member 14 and the side tube portion 11b. The gap portion and the gap portion formed between the inner peripheral surface 15c of the cylindrical power supply member positioning tool 55 and the outer peripheral surface 13a of the lead wire 13 are gradually moved by capillary action. Accordingly, a sufficient amount of the melt of the sealing material molded body is caused to flow into each of the gaps, particularly the gap formed between the outer peripheral surface 14a of the power supply member 14 and the side pipe part 11b. 11b can be reliably sealed. Moreover, the amount of the melt of the sealing material molded body that flows into each of the gaps can be adjusted by setting the volume on the inner peripheral side of the large-diameter inner peripheral portion 55d.

  The diameter (inner diameter) of the small diameter inner peripheral portion 55 c is preferably smaller than the outer diameter of the power supply member 14. As a result, the gap formed between the small-diameter inner peripheral portion 55c and the lead wire 13 is reduced. Therefore, before the melt of the sealing material molding moves to the gap formed between the outer peripheral surface 14a of the power supply member 14 and the side tube portion 11b, the small-diameter inner peripheral portion 55c and the lead wire 13 It becomes difficult to flow out to the outside (upward in FIG. 5) from the gap formed between the two. Accordingly, a sufficient and stable amount of the melt of the sealing material molded body can be caused to flow into the gap formed between the outer peripheral surface 14a of the power supply member 14 and the side tube portion 11b.

  FIG. 6 is an enlarged cross-sectional view showing still another configuration example of the metal halide lamp of the present invention.

  The configuration of the metal halide lamp 60 in FIG. 6 is such that the outer diameter of the cylindrical portion 65e around the small-diameter inner peripheral portion 65c of the cylindrical power supply member positioning tool 65 is larger than the outer diameter of the cylindrical portion 65f around the large-diameter inner peripheral portion 65d. 5 and the metal halide lamp 50 of FIG. 5 except that the connecting portion between the power supply member 14 and the lead wire 13 is disposed on the inner peripheral side of the large-diameter inner peripheral portion 65d. .

  If the outer diameter of the cylindrical portion 65e of the cylindrical power supply member positioning tool 65 is smaller than the outer diameter of the cylindrical portion 65f, for example, the cylindrical power supply member is caulked (plastically deformed). The positioning tool 65 can be easily fixed around the lead wire 13.

  Moreover, when the connection part of the electric power feeding member 14 and the lead wire 13 is arrange | positioned at the inner peripheral side of the large diameter inner peripheral part 65d, the said connection part is the cylinder part 65f arrange | positioned through the sealing material around it. Reinforced by.

  FIG. 7 is an enlarged cross-sectional view showing still another configuration example of the metal halide lamp of the present invention.

  The configuration of the metal halide lamp 70 in FIG. 7 is the same as that of the metal halide lamp 60 in FIG. 6 except that the connecting portion between the power supply member 14 and the lead wire 13 is accommodated in the side tube portion 11 b of the arc tube 11.

  When the connection portion between the power supply member 14 and the lead wire 13 is accommodated in the side tube portion 11b, the melt of the sealing material molding is also accommodated and held in the end portion of the side tube portion 11b. For this reason, it is possible to further increase the amount of the melt of the sealing material molded body that flows into the gap formed between the outer peripheral surface 14a of the power supply member 14 and the side tube portion 11b.

DESCRIPTION OF SYMBOLS 10 Metal halide lamp 11 Light emission tube 11a Light emission part 11b Side tube part 11c End surface of side tube part 12 Electrode rod 13 Lead wire 13a Outer surface of lead wire 14 Feed member 14a Outer surface of feed member 15 Cylindrical feed member positioning tool 15a Through-hole 15b bottom surface 15c inner peripheral surface 16 sealing material 26 sealing material molding 50 metal halide lamp 55 cylindrical power supply member positioning tool 55a top surface 55b bottom surface 55c small diameter inner peripheral portion 55d large diameter inner peripheral portion 60 metal halide lamp 65 cylindrical power supply member Positioning tool 65a Top surface 65b Bottom surface 65c Small diameter inner peripheral portion 65d Large diameter inner peripheral portion 65e, 65f Tube portion 70 Metal halide lamp

Claims (4)

Light emission made of a ceramic material, which is formed of a translucent light emitting portion that bulges in the central region and contains mercury and metal halide inside, and side tube portions formed on both sides of the light emitting portion. A power supply member inserted into each of the tube and the side tube portion, the electrode rod is connected to the end portion on the light emitting portion side, and the other end portion is connected to the lead wire, close to the power supply member of the lead wire A metal halide lamp including a cylindrical power supply member positioning tool fixed around a position to be sealed, and a sealing material that seals a gap formed between the outer peripheral surface of the power supply member and the side tube portion in an airtight state. And
The cylindrical power supply member positioning tool is formed of niobium or a niobium alloy, the bottom surface of the cylindrical power supply member positioning tool is opposed to the end surface of the side tube portion, and the sealing material is the outer periphery of the power supply member. From the gap formed between the surface and the side tube portion, the gap portion between the inner peripheral surface of the cylindrical power supply member positioning tool and the outer peripheral surface of the lead wire, and the bottom surface of the cylindrical power supply member positioning tool and the end surface of the side pipe portion A metal halide lamp characterized by extending to the entire surface facing the.   The inner peripheral portion of the cylindrical power supply member positioning tool includes a small-diameter inner peripheral portion on the top surface side that substantially matches the outer peripheral diameter of the lead wire, and a large-diameter inner peripheral portion on the bottom surface side that has a larger diameter than the small-diameter inner peripheral portion. The metal halide lamp according to claim 1.   The metal halide lamp according to claim 2, wherein an outer diameter of a cylindrical portion around the small-diameter inner peripheral portion of the cylindrical power feeding member positioning tool is smaller than an outer diameter of the cylindrical portion around the large-diameter inner peripheral portion. The manufacturing method of the metal halide lamp of Claim 1 including the following processes:
(1) Mercury and metal halide, arc tube made of a ceramic material comprising a translucent light emitting part bulging in the central region and side tube parts formed on both sides of the light emitting part, one end The electrode rod is connected to the part, and the other end is formed of a pair of power supply members connected to the lead wires, niobium or niobium alloy fixed to a position close to the power supply member of each lead wire A step of preparing a cylindrical power feeding member positioning tool and a pair of sealing material moldings molded in an annular shape;
(2) A power supply member to which the lead wire to which the cylindrical power supply member positioning tool is fixed and the electrode rod are connected is formed from the electrode rod side into the sealing material molded body formed in an annular shape, and then the arc tube side A step of inserting into the tube portion and disposing the end surface of the side tube portion and the bottom surface of the cylindrical power supply member positioning tool opposite to each other via the sealing material molding; and (3) the cylindrical power supply member positioning device. By supplying thermal energy to the surroundings, the sealing material molding is melted, and then the melt is formed between the outer peripheral surface of the power supply member and the side tube, and the cylindrical power supply member positioning tool. And then cooling to the gap between the inner peripheral surface of the lead wire and the outer peripheral surface of the lead wire, and the entire surface facing the bottom surface of the cylindrical power supply member positioning tool and the end surface of the side tube portion.

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