JP2008140614A - High-pressure metal vapor discharge lamp and lighting fixture - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high-pressure metal vapor discharge lamp easy to start and capable of aiming at reduction of unwanted light radiation, improvement of luminous efficiency, and curtailment of the number of components, as well as a lighting fixture using this discharge lamp, concerning a compact high-pressure discharge lamp of a low rated output sealing an ultraviolet radiation start-up element for start-up assistance. <P>SOLUTION: The high-pressure metal vapor discharge lamp L includes an arc tube 5, a cylindrical tube 8 made of a heat-resistant translucent material arranged so as to surround the arc tube 5, an ultraviolet radiation start-up element 7 with at least a part of it looking into the cylindrical tube, support members 4a, 4b supporting either end part of both the arc tube 5 and the cylindrical tube 8 and made of a conductor forming an outer electrode 48 of the ultraviolet radiation start-up element 7, power-feeding members 3a, 3b connected with a lead conductor of the arc tube 5, and an outer tube bulb 1 housing the arc tube 5, the cylindrical tube 8, the ultraviolet radiation start-up element 7, support members 4a, 4b, and the power feeding members 3a, 3b. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a high-pressure metal vapor discharge lamp provided with an ultraviolet radiation starting element for starting, and a lighting fixture using the discharge lamp.

  High-pressure metal vapor discharge lamps, for example, metal halide lamps in which halides are sealed in arc tubes to obtain high efficiency and high color rendering, start-up characteristics are not good due to insufficient initial electrons due to electron adsorption by halogen. is there.

Therefore, as a measure to increase the initial electrons, conventionally, radioactive materials such as promethium Pm ¹⁴⁷ and krypton Kr ⁸⁵ are enclosed in the arc tube to facilitate electron emission between the electrodes at the start. However, encapsulating radioactive materials inside the arc tube requires strict management for handling and storage of radioactive materials in the work, and in recent years, means for assisting startup in place of such radioactive materials have been adopted. It has been.

  As this starting assist means, Japanese Patent Laid-Open No. 1-134848, Japanese Patent Laid-Open No. 1-134849, Japanese Patent Publication No. 7-7662 and the like include a starting element that irradiates an arc tube such as a metal halide lamp with ultraviolet rays at the time of starting. A high-pressure metal vapor discharge lamp using ultraviolet light provided is disclosed.

  In this high pressure metal vapor discharge lamp by ultraviolet irradiation, a high pulse voltage supplied from a ballast when the discharge lamp is lit is applied to the internal conductive member and external conductive member of the pair of electrodes of the arc tube and the ultraviolet radiation starting element. Each is applied and discharged in the bulb of the ultraviolet radiation starting element to generate ultraviolet rays. By irradiating the ultraviolet rays toward the inside of the arc tube, electrons are emitted from the surface of the electrode, increasing the initial number of electrons and discharging in the arc tube. Is likely to occur and is started.

  Further, in this high pressure metal vapor discharge lamp, the pressure in the arc tube at the time of lighting is about 100 kPa to 500 kPa, depending on the lamp power and size, but in unexpected situations such as deterioration of the arc tube bulb, When the internal pressure rises due to an abnormal current caused by a malfunction in the lighting circuit device, etc., it may not be able to withstand that pressure, and the arc tube bulb may burst, and if this arc tube bulb bursts, There is a risk that the fragments such as the above also damage the outer tube valve and scatter these fragments outside the instrument.

  As a countermeasure, a protective cover member was provided on the side of the luminaire, but as the cover member deteriorated over time, the luminous efficiency of the fixture decreased due to a decrease in the transmittance of dirt visible light. In the case of a certain lighting fixture, it was very troublesome.

Therefore, instead of the protective cover member on the appliance side, a splash-proof coating is formed on the outer surface of the outer tube bulb constituting the discharge lamp with a material such as a translucent resin, or the arc tube bulb is surrounded by a heat resistant transparent material. It is known and often used in many cases that a discharge prevention means is provided on the discharge lamp side such as by providing a light cylindrical tube so as to prevent damage to the outer bulb.

The inventors of the present invention, in this type of high-pressure metal vapor discharge lamp, surround the arc tube in order to prevent scattering of fragments when the arc tube bulb bursts in the outer bulb and to improve the luminous characteristics of the arc tube. An invention has been filed in which a cylindrical tube to be heated and a starting circuit component having an ultraviolet radiation starting element for assisting the starting are provided at predetermined positions within a virtual extension line of the cylindrical tube outside the cylindrical tube. (Patent Document 1)
JP 2003-1000025 A

  As in the above-mentioned technical document 1, a lamp provided with a starting tube constituent member having a cylindrical tube surrounding the arc tube and an ultraviolet radiation starting element in the arc tube bulb has a simple configuration and high economic efficiency. Has the advantage.

  However, recently, along with the downsizing of lighting fixtures, the discharge lamps inserted into the fixtures are also required to be downsized in terms of outer diameter and overall length. In this miniaturized lamp, in order to seal the arc tube, the cylindrical tube, the ultraviolet radiation starting element, the support member and the power supply member, etc., which are supported in the reduced outer bulb, Problems can arise.

  That is, the arc tube, the cylindrical tube, the ultraviolet radiation starting element, and the like are each supported through a support member, and it is difficult to assemble and arrange these members due to the internal volume of the outer tube bulb. It was.

  The present invention has been made in view of the above circumstances, and it is easy to start in a high-pressure discharge lamp in which an arc tube is enclosed in an outer tube and a heat-resistant translucent cylindrical tube is provided and an ultraviolet radiation starting element is sealed as a starting aid. It is an object of the present invention to provide a high-pressure metal vapor discharge lamp capable of reducing undesired light emission, improving luminous efficiency, and reducing the number of parts, and a lighting fixture using the discharge lamp.

  A high-pressure metal vapor discharge lamp according to claim 1 of the present invention includes a light-emitting tube in which a pair of electrodes are sealed in a bulb via an introduction conductor and a discharge medium is enclosed; and surrounds the periphery of the light-emitting tube. A cylindrical tube made of a heat-resistant translucent member disposed in such a manner; an ultraviolet radiation starting element disposed so that at least a part thereof faces the cylindrical tube; and supporting both ends of the arc tube and the cylindrical tube And a conductive support member in which an external electrode of the ultraviolet radiation starting element is disposed; a power supply member connected to the introduction conductor of the arc tube; the arc tube, the cylindrical tube, the ultraviolet radiation start element, the support member, and the power feed And an outer tube valve containing the member.

  The high-pressure metal vapor discharge lamp according to the present invention mechanically supports the ultraviolet radiation starting element with a support member to which an electric potential is applied, and this support member forms an external electrode. The ultraviolet radiation starting element is supported alone. No special support member is required. In addition, since the number of parts can be reduced, the factors that obstruct light emission from the arc tube can be reduced.

  In addition, the ultraviolet radiation starting element, in which at least a part of the ultraviolet radiation starting element for generating ultraviolet light is disposed in the cylindrical tube, is brought close to the electrode in the arc tube. The upper and lower electrodes of the arc tube and the ultraviolet radiation starting element connected in parallel to the electrodes are energized at the same time, and the ultraviolet radiation starting element disposed close to the electrode as a starter is charged with argon gas or mercury by an internal glow discharge. The amount of ultraviolet rays generated from the electrode increases, the initial electron count increases, and the pulse voltage from the ballast of the lighting circuit device connected to the discharge lamp is applied to the electrode, making it easy to start the discharge lamp Can be done.

  In addition to the ultraviolet rays directly radiated from the ultraviolet radiation starting element toward the arc tube, a part of the ultraviolet rays directed toward the cylindrical tube is reflected by the wall surface of the cylindrical tube and radiated toward the far electrode, so that the initial electrons are emitted. The startability can be improved because the increase of the value is removed.

  Furthermore, since the ultraviolet radiation starting element is located in the cylindrical tube, when sealing the downsized outer tube valve and the stem, the thermal effect transferred from the inner surface of the outer tube valve to the ultraviolet radiation starting device is affected. Can be reduced.

  In the present invention and the following invention, the external electrode of the ultraviolet radiation starting element refers to the support member side made of a conductive metal body that is separate from the ultraviolet radiation starting element. It may be provided so that the external electrode is connected to the support member.

  The high-pressure metal vapor discharge lamp according to claim 2 of the present invention is characterized in that the ultraviolet radiation starting element is sandwiched by an external electrode formed by cutting and raising a support member, and is mechanically supported and electrically connected. And

  By holding the ultraviolet radiation starting element in the section obtained by cutting and raising a part of the support member, the external electrode can be manufactured easily and inexpensively, and the assemblability is improved.

  The high-pressure metal vapor discharge lamp according to claim 3 of the present invention is characterized in that the ultraviolet radiation starting element is fitted into a through hole formed in a support member made of a conductor.

  By inserting the ultraviolet radiation starting element into the hole formed in the support member, the insertion support is completed, and the assembling work is facilitated.

  A lighting fixture according to claim 4 of the present invention comprises: a fixture main body; the high-pressure metal vapor discharge lamp according to any one of claims 1 to 3 disposed in the fixture main body; and the high-pressure metal vapor. And a lighting circuit device connected to the discharge lamp.

  Since the high-pressure metal vapor discharge lamp with improved starting characteristics according to any one of claims 1 to 3 is incorporated, the lamp can be turned on in a short time, and even if the arc tube bulb is broken, the fragments of the member are removed. A highly safe lighting apparatus that is not scattered can be provided.

  According to the present invention, since the ultraviolet radiation starting element is disposed in the vicinity of the arc tube, the amount of ultraviolet irradiation to the electrode can be increased, and the starting can be easily performed in a short time. Since it is not necessary to separately provide a support member for the ultraviolet radiation starting element, the number of parts can be reduced and a metal vapor high pressure discharge lamp that can be easily assembled can be provided.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 is a front view showing an outline of a metal halide lamp as a high-pressure metal vapor discharge lamp according to the present invention, and FIG. 2 is a cross-sectional view showing an outline of a support member on the upper (base) side in FIG. 3 is an enlarged cross-sectional front view showing the arc tube portion disposed in the outer tube bulb in FIG. 1, and FIG. 4 is an enlarged view of the support portion of the ultraviolet radiation starting element disposed in FIGS. FIG. 4A is a front view, and FIG. 4B is a bottom view.

  The metal halide lamp L shown in FIG. 1 has a long power supply member 3a on one of a pair of inner conductors 2a and 2b led out from a stem 2 sealed at one end of an outer tube bulb 1, and a short power supply on the other. The member 3b is connected, and the arc tube 5, the ultraviolet radiation starting element 7 and the luminous tube 5 and the ultraviolet radiation starting element 7 are surrounded by support members 4a and 4b provided above and below the middle portion of the long power supply member 3a. The end portion of the heat-resistant translucent cylindrical tube 8 is supported.

  More specifically, the outer tube bulb 1 has a straight tube shape (T shape) made of translucent hard glass such as borosilicate glass, and is closed in a substantially hemispherical shape on the lower side in the figure. And a neck portion 12 on the upper side, a seal portion (not shown) with the stem 2 is formed on the neck portion 12 side, and an E-shaped base 10 is attached to cover the seal portion. Yes.

  As shown in an enlarged view in FIG. 3, the arc tube 5 is made of an alumina transparent material in which small-diameter cylindrical portions 53a and 53b connected to both ends of a substantially spherical bulging portion 52 by continuous curved surfaces. An arc tube bulb 51 that forms a discharge vessel made of a photoceramic is provided, and a wire made of niobium or the like that penetrates through the distal ends of the small diameter cylindrical portions 53a and 53b of the arc tube bulb 51 and is connected to the electrodes 6A and 6B The lead-in conductors 63 and 63 have a vertically symmetrical structure in which the heat-resistant sealing agents 64 and 64 are hermetically sealed.

  The introduction conductors 63 and 63 include an outer conductor portion 66 led out of the arc tube bulb 51, and a coil-shaped portion in which a molybdenum wire is wound at a portion where the outer conductor portion 66 is extended into the small diameter cylindrical portions 53a and 53b. 65. The electrodes 6A and 6B are butt welded to each other through a coil-shaped portion 65, and an electrode shaft 62 made of a tungsten wire with the tip side facing the bulging portion 52 side, and a tungsten thin wire at the tip of the electrode shaft 62. The coiled electrode 61 is wound.

  The coil-shaped portion 65 is formed when the gap between the electrode shaft 62 penetrating the small-diameter cylindrical portions 53a and 53b and the inner wall surfaces of the small-diameter cylindrical portions 53a and 53b is large. The coil may be wound so that the gap is as small as 0.1 mm or less, and the outer surface of the coil may be in contact with the inner surfaces of the small-diameter cylindrical portions 53a and 53b. Further, the coiled electrode 61 at the tip of the electrode shaft 62 is not essential, and the tip of the electrode shaft 62 may perform an electrode function.

  Also, in the bulb 51 of the arc tube 5, a starting and buffer gas containing, for example, argon Ar as a discharge medium, and metal halides such as sodium iodide, thallium iodide, indium iodide and thulium iodide as the luminescent metal. And mercury are enclosed.

  The heat-resistant translucent cylindrical tube 8 is formed in a cylindrical shape having upper and lower ends made of quartz glass, and surrounds the arc tube 5 with a predetermined interval and at least the inner end portion of the arc tube bulb 51. It is arranged with a covering length.

  The power supply members 3a and 3b that are connected to the inner conductors 2a and 2b of the stem 2 and extend into the outer tube valve 1 have a linear or plate shape made of molybdenum, stainless steel, or the like, and one long power supply member 3a. Is connected to an outer conductor portion 66 led out from the arc tube 5, and support members 4a and 4b are attached above and below the middle portion. The other power supply member 3 b is connected to the outer conductor portion 66 led out from the arc tube 5. Further, a getter 40 or the like can be attached to the power supply members 3a and 3b.

  The support members 4a and 4b are formed by punching a thin plate made of a conductive metal such as stainless steel or iron-nickel alloy into a predetermined shape. For example, a plurality of support members 4a and 4b are formed around an annular land 42 provided with a through hole 41 in the center. , 45,..., 46, 47 (some of them are not shown here, but there are one leg portion 43 (for connecting the power supply member 3a), one leg portion 44 ( The outer tube bulb 1 inner wall abutment) and 45 (cylindrical tube 8 inner wall abutment) are approximately equiangular each at three locations, the leg portion 46 (the outer peripheral wall abutment of the small-diameter cylindrical portions 53a and 53b of the arc tube 5). For each) and leg portions 47 (for holding the ultraviolet radiation starting element 7) for each one), and these leg portions 43, 44, ..., 45, ..., 46, ..., The light emission is performed by bending 47 upward, downward, or sideways, or holding the power supply member 3a. 5, it is possible to support the ultraviolet radiation starting element 7 and heat translucent cylindrical tube 8.

  That is, each support member 4a, 4b has a leg portion 43 fixed above and below the middle portion of the long power supply member 3a so as to be orthogonal to the axis of the outer tube bulb, and a small diameter cylindrical shape at both ends of the arc tube 5 The portions 53a and 53b are loosely passed through the through holes 41 in the center of the support members 4a and 4b.

  Further, the flat surfaces of the plurality of leg portions 44 provided on the support members 4a and 4b are in contact with the end surfaces of the cylindrical tube 8, and the cylindrical tube 8 is supported with the upper and lower end surfaces sandwiched therebetween. The front ends of the plurality of leg portions 44,... Are inclined and bent in a direction away from the cylindrical tube 8, and the front ends thereof are in elastic contact with the inner wall surface of the outer tube valve 1. Further, the plurality of leg portions 45 are bent in the direction inside the cylindrical tube 8, and the tip portions thereof are in elastic contact with the inner wall surface of the cylindrical tube 8.

  In addition, the leg portion 46 provided on the support member 4a located on the top portion 11 side of the outer tube bulb 1 is bent to extend along the arc tube 5 axis, and is connected and fixed to the introduction conductor 63 extending from the small-diameter cylindrical portion 53a. In addition, the three leg portions 46 (not shown) provided on the support member 4b located on the neck portion 12 side are small-diameter cylindrical portions that are loosely passed through the through holes 41. 53b is pressed from the outside so as to be positioned on the central axis.

  The ultraviolet radiation starting element 7 is a so-called enhancer. As shown in an enlarged view in FIG. 4, the ultraviolet radiation starting element 7 is sealed with a molybdenum wire or the like in a sealing portion 72 formed at an end portion of an ultraviolet permeable airtight valve 71 made of quartz glass. A lead wire 73 that is also used as an incoming wire is hermetically sealed, and a conductive member constituting a foil-like or linear internal electrode 74 made of molybdenum or the like is connected in the ultraviolet radiation portion 75 of the hermetic bulb 71. Is connected to the other power supply member 3b. The airtight valve 71 is filled with a rare gas such as argon.

  The enhancer 7 includes a belt-like leg portion 47 formed on the support member 4b. The ultraviolet radiation portion 75 on the internal electrode 74 side of the hermetic bulb 71 faces the inside of the cylindrical tube 8 and is arranged substantially along the arc tube 5 axis. A winding part 48 is formed which is wound around the outer periphery of the valve 71 and is held by welding and fixing at the tip part.

  That is, the winding portion 48 functions as an external electrode electrically connected to the power supply member 3a via the support member 4b. At this time, the winding portion 48 may have a slight gap between it and the hermetic valve 71, but at least a part thereof is in contact with it to mechanically support the hermetic valve 71 (ultraviolet radiation starting element 7) and Have the effect of contact.

  The arc tube 5, the enhancer 7 and the cylindrical tube 8 in the outer tube bulb 1 are supported and fixed or electrically connected to the power supply members 3a and 3b and the support members 4a and 4b in the configuration described above. , 45,... Are held on substantially the center axis of the lamp (outer tube bulb) shaft by leg portions 44,..., 46,... Elastically contacting the inner wall surface of the bulb 1, the cylindrical tube 8 wall surface, and the outer peripheral surface of the small diameter cylindrical portion 53b. At the same time, even if some vibrations or shocks are applied, this can be mitigated to prevent the arc tube 5 from being damaged.

  A convex portion such as a hemispherical shape or a bent shape may be formed in a portion that elastically contacts other parts such as each leg portion 44,..., 45,. Further, the power supply members 3a and 3b, the support members 4a and 4b, and the conductive members can be connected and fixed to each other by means such as welding, brazing, and caulking, and the inner conductors 2a and 2b and the power supply member 3a. , 3b, conductive members, etc. are not specially provided, and the number of members may be reduced by combining them by changing the length and arrangement direction.

  The high-pressure metal vapor discharge lamp L shown in FIG. 1 is a double-pipe metal halide lamp L in which a light-emitting tube 5 is housed in a straight tube (T-shaped) outer tube bulb 1 with 10 parts attached to a socket. Then, power is supplied from a power source through a lighting circuit device (not shown) having a ballast and the like, and the lamp is lit in a vertical, horizontal, or inclined state.

  As the lighting circuit device, a rectangular wave lighting circuit device or a magnetic excitation type ballast lighting circuit device such as a choke coil type or a transformer type can be used for lighting. For example, a high-pressure discharge lamp can be lit with a rectangular wave with a lighting frequency of 100 Hz to 1 kHz and a secondary open circuit voltage from a ballast of 150 to 400V.

  The discharge lamp L connected to the lighting circuit device is electrically connected to a terminal portion (not shown) of the base 10 at the time of start-up. The inner conductor 2a (2b) -the power feeding member 3a (3b) -the outer conductor 66 (66) -Electrodes 6A and 6B and inner conductor 2a (2b) -feeding member 3a (3b) -leg part 43 of support member 4b (lead wire 73) in the arc tube 5 through the introduction conductor 63 (63) The high voltage pulse voltage is applied to the winding part 48 and the internal electrode 74 that form the external electrode via the land 42 and the leg part 47.

  By applying this voltage, a discharge is generated between the internal electrode 74 and the winding portion (external electrode) 48 of the enhancer 7 having a lower impedance than between the electrodes 6A and 6B in the arc tube 5. As a result of this discharge, ultraviolet rays are generated in the enhancer 7 and are transmitted through the ultraviolet radiation portion 75 of the hermetic bulb 71 so that the ultraviolet rays are radiated to the outside and irradiate the electrodes 6A and 6B in the arc tube 5.

  In the present invention, the enhancer 7 is disposed close to the arc tube 5, so that the amount of ultraviolet radiation directed toward the electrodes 6A and 6B can be increased. The ultraviolet rays reflected by the wall surface of the cylindrical tube 8 reach the other electrode 6A, and the amount of ultraviolet rays applied to both the electrodes 6A and 6B can be increased as compared with the prior art.

  Then, the discharge between the electrodes 6A and 6B is promoted, and the arc tube 5 is easily started within an extremely short time of about 2 to 4 seconds (about 20 to 70% shorter than the conventional one). Stable lighting can be sustained. That is, when the electrodes 6A and 6B existing in the discharge space of the arc tube 5 are irradiated with ultraviolet rays having energy higher than the work function of the electrode constituent metal, electrons are emitted from the surfaces of the electrodes 6A and 6B. The number increases to easily cause discharge.

  If the discharge shifts between the electrodes 6A and 6B, the impedance between the electrodes 6A and 6B decreases, and the space between the internal electrode 74 forming the electrode of the enhancer 7 and the winding portion 48 forming the external electrode is reduced. The impedance becomes higher and the discharge in the enhancer 7 stops.

  As described above, the high-pressure metal vapor discharge lamp L according to the present invention provides mechanical support and electrical support for the enhancer 7 with the winding portion 48 formed by winding the tip side of the leg portion 47 formed by cutting and raising the support member 4b to which a potential is applied. Therefore, a special support member for supporting the enhancer 7 alone is not required, the number of parts is reduced, and the factors that hinder the light emission from the arc tube 5 are reduced. There is an advantage that efficiency can be improved.

  Further, since the ultraviolet radiation starting element 7 is supported by the support member 4b disposed in the vicinity of the electrodes 6A and 6B of the arc tube 5, the number of initial electrons in the arc tube 5 increases when the lamp is started. As a result, it is possible to provide a discharge lamp L with improved start-up characteristics that is easy and reliable to cause discharge and shortens the time required for starting the lamp L.

  In addition, the discharge lamp L is sealed between the outer tube bulb 1 and the stem 2, but the ultraviolet radiation starting element 7 is disposed in the cylindrical tube 8, so that a heating burner at the time of sealing is used. As a result of the temperature rise of the ultraviolet radiation starting element 7 being reduced, it is possible to prevent such a situation that the ultraviolet radiation starting element 7 is thermally deteriorated and does not emit predetermined ultraviolet radiation.

  In addition, even if the arc tube bulb 51 is broken and the fragments of the members are scattered, the cylindrical tube 8 is provided so as to surround the arc tube 5, thereby preventing this or reducing the impact and reducing the outer tube. The stress applied to the valve 1 can be reduced, and the outer tube valve 1 can be prevented from being damaged, thereby greatly contributing to safety.

  Further, since the lamp L is shielded from the heat radiation of the arc tube 5 by the cylindrical tube 8 disposed close to and surrounding the arc tube 5, the arc tube bulb 51 can be further heated. That is, this temperature rise also raises the temperature of the entire arc tube bulb 51 and the base portions of the inner end electrodes 6A and 6B forming the coldest portion, so that the luminescent metal enclosed in the bulb 51 evaporates. Thus, it is possible to provide a high-pressure metal vapor discharge lamp L having a higher vapor pressure and improved characteristics such as luminous efficiency and color rendering.

  According to experiments by the present inventors, in a high pressure discharge lamp with a rated power of 20 to 150 W and a total length of the lamp including the base of about 100 to 150 mm, which can be reduced in power, the electrode of the arc tube in the cylindrical tube The startup characteristics can be improved by positioning an ultraviolet radiation starting element such as an enhancer in the vicinity.

  FIG. 5 shows another embodiment of a support member that supports the ultraviolet radiation starting element 7 according to the present invention. 5 (a) is a top view of the support member 4c, and FIG. 5 (b) is a front view of the support member 4c shown in FIG. In the figure, the same parts as those in FIGS. 2 and 4 are denoted by the same reference numerals, and the description thereof is omitted.

  The support member 4c is formed by punching a thin metal plate made of a conductor into a disk shape, and supports the arc tube 5 and the cylindrical tube 8 with a pair of support members 4c. The support member 4c has, for example, a through hole 41 through which the small-diameter cylindrical portions 53a and 53b of the arc tube 5 pass in the center, and a through hole 49 into which the ultraviolet radiation starting element 7 is inserted in the middle. Although not shown, a fixing member for the protruding power supply member 3a is provided on the periphery. The small diameter cylindrical portion 53b of the arc tube 5 is inserted into the through hole 41, and the bulb 71 of the ultraviolet radiation starting element 7 is inserted into the through hole 49, and the periphery of the through hole 49 is irradiated with ultraviolet radiation. It becomes an external electrode for the starting element 7.

  At this time, as shown in FIG. 5 (b), for example, as shown in FIG. When the through hole 49 is punched, a plurality of inwardly inclined tongue pieces 40 are formed on the periphery of the through hole 49 so that the tongue pieces 40 are inserted into the through hole 41. The hermetic valve 71 of the ultraviolet radiation starting element 7 is pressed to provide strong support, and an electrically large area can correspond to the internal electrode as an external electrode to improve the startability. At this time, since the insertion portion of the ultraviolet radiation starting element 7 acts as the external electrode 76, there may be a small gap, but it is electrically preferable that at least a part of the airtight valve 71 is in contact.

  The support member 4c formed in a disc shape also supports the arc tube 5, the cylindrical tube 8 and the ultraviolet radiation starting element 7 and the external electrode of the starting element 7 similar to the support member 4b formed in the shape shown in FIG. As an effect.

  FIG. 6 is a longitudinal sectional view showing an outline of an embodiment of a lighting fixture 9 for store lighting equipped with the high-pressure metal vapor discharge lamp L according to the present invention.

  The lighting fixture (downlight) 9 shown in FIG. 6 has a socket 93 attached to a base 92 provided in the upper part of a housing 91 and has a conical shape made of a metal plate and reflects it on the inner surface. The reflecting shade 94 having a surface is fixed, and the base 10 of the discharge lamp L is mounted on the socket 93, whereby the lamp L is held and electrically connected. In the figure, reference numeral 95 denotes a protective cover member made of a translucent glass plate provided to cover the opening of the housing 91.

  In this luminaire 9, for example, a casing 91 is attached to a ceiling surface of a department store or the like with the opening side of the reflective shade 94 facing downward, and a power circuit is turned on to turn on a lighting circuit device (not shown), The discharge lamp L is energized through the socket 93.

  Then, when the lamp L in a vertical state with the base 10 side upward (has up) in the reflecting shade 94 is turned on, visible light from the lamp L is reflected by the reflecting surface or directly transmitted through the opening. Then, it is possible to obtain a predetermined illuminance by irradiating a product, a venue, a passage or the like below which is an object to be irradiated.

  Therefore, since the lighting fixture 9 according to the embodiment of the present invention using the high-pressure metal vapor discharge lamp L uses the discharge lamp L with improved starting characteristics, the lamp L can be moved in a shorter time than the conventional fixture. The lighting fixture 9 can be provided with a desired illumination and safety can be improved, so that it is possible to omit the provision of a protective cover member for preventing scattering made of tempered glass or a wire mesh in the opening of the fixture. Can be provided.

  In this embodiment, the casing 91, the base 92, the socket 93, the reflective shade 94, and the like constitute the instrument body. However, if not necessary, some members are omitted, or a front cover is provided. It is possible to configure the main body of the instrument. Further, the lighting circuit device of the lamp L, the power switch, and the like may be provided in a place different from the instrument body, or may be housed in the housing 91 or the like.

  The present invention is not limited to the above embodiment. For example, as a material for forming the arc tube bulb as a discharge vessel, ceramics made of aluminum oxide (alumina) or the like is used, but yttrium-aluminum- that can satisfy luminescent characteristics, heat resistance, corrosion resistance, electrical insulation, and the like. Even if translucent ceramics such as garnet oxide, yttrium oxide, aluminum nitride, ruby or sapphire are used, or depending on the type of discharge lamp, silicon oxide such as quartz glass, borosilicate glass or aluminosilicate glass may be used. Heat-resistant translucent high silica glass as a main component may be used.

  The arc tube bulb is composed of a single shape such as a cylindrical shape, an oval shape, a spherical shape, or a composite shape. The form of the sealing part formed at the end of the arc tube bulb can be filled with an adhesive in the case of ceramics, shrink-fitted with a disk or cap, or sealed with an adhesive, and in the case of glass An introduction conductor such as a metal foil or a metal wire can be sealed in the valve end portion by crushing sealing or shrink (baking drawing) sealing.

  In addition, the electrodes provided in the arc tube are at least a pair, and the presence or absence of an auxiliary electrode is not questioned. Further, as the discharge medium sealed in the arc tube bulb, mercury, luminescent metal, halogen, rare gas, or the like can be appropriately selected and used according to the lamp type, application, characteristics, and the like.

  The cylindrical tube can be made of a heat-resistant and light-transmitting material similar to the arc tube bulb, and has a cylindrical shape. The thickness of the cylindrical tube is in the range of about 1.0 to 3.0 mm, and the cylindrical tube may be a double tube.

  As a means for increasing the strength of the cylindrical tube, it can be dealt with by winding a linear or mesh reinforcing body made of inorganic fibers such as heat-resistant ceramics around the outer periphery of the cylindrical tube. Further, a phosphor film, a light diffusion film, a coating film such as a blocking film that reflects or absorbs ultraviolet rays, or an uneven surface for light diffusion may be formed on the surface of the cylindrical tube.

  Further, the arc tube may be supported by fixing the bulb end or the externally introduced conductor led out from the end directly to the support member or the power supply member. This can be done by attaching or caulking.

  Further, the starting element that constitutes the ultraviolet radiation source is made of an enhancer and the like, and includes a hard glass such as quartz glass or borosilicate glass that transmits at least a part of the wavelength of 200 nm to 460 nm, a soft glass or ceramic that transmits ultraviolet light, or the like. And a discharge medium such as argon gas or argon gas and mercury and an internal conductive member are sealed in the bulb to emit ultraviolet rays during glow discharge.

  As the internal conductive member of the enhancer, a metal such as molybdenum or tungsten having electrical conductivity and heat resistance, or tantalum having a getter function for absorbing an impurity gas inside can be used. In addition, the shape and form of the conductive member is rod-shaped, foil-shaped, coil-shaped, etc., and even if it is connected to the introduction line penetrating the sealing portion or does not have the introduction line, it is dielectrically connected to the outside of the container It may be done.

  The arrangement of the ultraviolet radiation starting element is provided close to and parallel to the arc tube in the above embodiment, but may be provided inclined or substantially orthogonal to the arc tube. Further, the arrangement of the ultraviolet radiation starting element is provided in the vicinity of the support member 4b on the neck portion 12 side in FIG. 1, but may be provided in the vicinity of the support member 4a on the top portion 11 side or both the upper and lower support members 4a, You may provide in the multiple places of the vicinity of 4b.

  Moreover, the clamping structure of the ultraviolet radiation starting element formed on the support members 4b and 4c is not limited to the structure in which the cut-and-raised piece is wound or inserted into the hole, and the external electrode is configured by being clamped by another structure or means. You may do it.

  In short, it is only necessary that the ultraviolet radiation portion of the ultraviolet radiation starting element is in close proximity to the electrode in the arc tube, and the enhancer is preferably arranged so that the sealing portion side of the bulb comes far from the electrode in the arc tube.

  The outer tube bulb is made of hard glass such as quartz glass, borosilicate glass or aluminosilicate glass, or soft glass such as soda lime glass, and the shape thereof is A type, A type, AP type, B type, BT type, etc. What was formed in ED form etc. can be used.

  The inside of the outer tube valve is an inert gas or nitrogen gas atmosphere or a vacuum atmosphere. In other words, inert gas or nitrogen gas is enclosed in the outer tube bulb at a low pressure or in a vacuum atmosphere to prevent oxidation of the arc tube component, support member, and stem component that become high temperature during lighting, and The restart time can be shortened, and it is possible to prevent rupture when the outer tube valve is damaged.

  The high-pressure metal vapor discharge lamp to which the present invention can be applied has, for example, a multi-tube structure such as a double tube in which an arc tube is sealed in an outer bulb in a metal halide lamp, a short arc metal halide lamp, a high-pressure mercury lamp, or the like. . Moreover, the lighting posture of the discharge lamp may be an inclined posture as well as horizontal and vertical.

  Furthermore, the lighting fixture to which the present invention can be applied may have members such as a reflecting mirror, a translucent cover and a lens, and the lighting circuit device may be installed inside or outside the fixture. May be.

  Furthermore, the luminaire is a broad concept including any fixture that uses the light emission of a high-pressure discharge lamp for any purpose. For example, it is preferable to apply to lighting for department stores, stores, theaters, halls, underground malls, plazas, offices and factories as well as headlights for mobile objects, light sources for optical fibers, image projection, photochemistry, fingerprint discrimination, etc. Starting characteristics and emission characteristics can be obtained.

It is a schematic front view which shows embodiment of the metal vapor | steam high-pressure discharge lamp (metal halide lamp) of this invention. It is a cross-sectional view which shows the outline which looked at the support member in the upper (base) side in FIG. 1 from the downward direction. It is an expanded sectional front view which shows the arc tube part arrange | positioned in the outer tube | bulb bulb | bulb in FIG. 1 and FIG. 2 are enlarged views of the supporting portion of the ultraviolet radiation starting element, FIG. 4 (a) is a front view, and FIG. 4 (b) is a bottom view. FIGS. 5A and 5B show another embodiment of a support member that supports an ultraviolet radiation starting element according to the present invention. FIG. 5B is a top view, and FIG. It is a front view which cuts and shows the principal part of the state which supported the starting element. It is a front view which shows the outline of the lighting fixture equipped with the metal vapor | steam high pressure discharge lamp (metal halide lamp) shown to embodiment of this invention.

Explanation of symbols

L: Metal vapor high pressure discharge lamp (metal halide lamp)
1: Outer tube valve 3a, 3b: Power supply member 4a, 4b, 4c: Support member 48: External electrode (winding portion)
49: External electrode (periphery of through hole)
5: arc tube 51: arc tube bulb (discharge vessel)
6A, 6B: Electrode 63: Introducing conductor 7: Ultraviolet radiation starting element (enhancer)
74: Internal electrode 8: Heat-resistant translucent cylindrical tube 9: Lighting equipment

Claims (4)

An arc tube in which a pair of electrodes are sealed in a bulb via an introduction conductor and a discharge medium is sealed;
A cylindrical tube made of a heat-resistant translucent member disposed so as to surround the arc tube;
An ultraviolet radiation starting element disposed so that at least a part thereof faces the cylindrical tube;
A conductive support member that supports both ends of the arc tube and the cylindrical tube and is provided with an external electrode of the ultraviolet radiation starting element;
A power supply member connected to the introduction conductor of the arc tube;
An outer tube bulb containing the arc tube, cylindrical tube, ultraviolet radiation starting element, support member and power supply member;
A high-pressure metal vapor discharge lamp comprising:   2. The high-pressure metal vapor discharge lamp according to claim 1, wherein the ultraviolet radiation starting element is sandwiched by an external electrode formed by cutting and raising the support member, and is mechanically supported and electrically connected.   The high-pressure metal vapor discharge lamp according to claim 2, wherein the ultraviolet radiation starting element is fitted into a through hole formed in a support member made of a conductor. An instrument body;
A high-pressure metal vapor discharge lamp according to any one of claims 1 to 3 disposed in the appliance body;
A lighting circuit device connected to the high pressure metal vapor discharge lamp;
The lighting fixture characterized by comprising.

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