JP2011175856A - High-pressure discharge lamp, and lighting apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lamp with an arc tube having a starting proximity conductor on the outer peripheries of small-diameter cylindrical portions, wherein easy-electron-emission material layers less reactive with halide filled in the arc tube are provided for improving starting characteristics. <P>SOLUTION: The high-pressure discharge lamp includes: the arc tube 1A consisting of the halogen-resistant easy-electron-emission material layers formed on the surfaces of introduced conductors 2A, 2B or on the inner surfaces of the small-diameter cylindrical portions 12a, 12b, and discharge medium including the metal halide and starting gas filled in a discharge container 1; a pair of feeding member electrically connected to the introduced conductors 2A, 2B of the arc tube 1A, and holding the arc tube 1A; and the proximity conductors 5 attached to the outer peripheral areas of the small-diameter cylindrical portions 12a, 12b opposed to the easy-electron-emission material layers of the one-side introduced conductors 2A, 2B, and connected to the feeding members to be the same in potentials as other-side electrodes 20a, 20b, respectively. A lighting apparatus is mounted with the same. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a high pressure discharge lamp such as a metal halide lamp in which a starting auxiliary proximity conductor is provided together with an arc tube in an outer tube, and an illumination device using the discharge lamp.

  High-pressure discharge lamps, such as metal halide lamps, are widely used as light sources for optical equipment such as overhead projectors and liquid crystal projectors, as well as lighting for wide areas such as roads, plazas, and stadiums, as well as stores and vehicles. .

  In this kind of high-pressure discharge lamp, oxides such as barium (Ba), strontium (Sr), calcium (Ca), thorium (Th), dysprosium (Dy) and scandium (Sc) are used to improve the starting characteristics. It is known to provide an easy-electron-emitting material layer made of the electrode on the electrode, but these materials react with the halide encapsulated for light emission in the arc tube to cause deterioration, wear and generation of impure gas. However, there are problems such as a decrease in light emission characteristics and a shortened life.

  Also, in the field of high-pressure discharge lamps such as metal halide lamps, there is a demand for small size, high efficiency and energy saving, and a small-diameter cylindrical portion is provided in communication with both ends of the bulging portion having a substantially spherical shape or a substantially cylindrical shape. A discharge vessel made of a light-emitting metal halide and a rare gas is sealed in the discharge vessel. In some cases, the arc tube is sealed in an outer tube via a power supply member.

  In the lamp having such a configuration, in order to improve the starting characteristics, for example, as shown in Patent Document 1, the introduction conductor inserted into the cylindrical portion on the outer periphery of the one small-diameter cylindrical portion is An auxiliary conductor connected to the other introduction conductor to which a different potential is applied is provided by winding it as a proximity conductor (metal coil), and at the time of starting, the proximity conductor (metal coil) and the inner introduction conductor After a slight discharge is generated between the electrodes, a transition is made to a discharge between the electrodes.

JP 2002-110029 A

  As shown in the above-mentioned Patent Document 1, the starting voltage was reduced by providing a proximity conductor (metal coil) on the outer periphery of the small-diameter cylindrical portion. In a high-pressure discharge lamp such as a metal halide lamp having this structure, Further improvement of the starting characteristics has been demanded, and the inventor has investigated the starting and completed the present invention.

  The present invention provides a lamp having an arc tube in which a starting proximity conductor is provided on the outer periphery of the small-diameter cylindrical portion, and is provided with an easy-electron emitting material layer that is less reactive with halide enclosed in the arc tube, An object of the present invention is to provide a high-pressure discharge lamp and an illumination device equipped with the discharge lamp.

  A high pressure discharge lamp according to a first aspect of the present invention is a translucent discharge vessel having a pair of small-diameter cylindrical portions having an inner diameter smaller than the bulge portions provided at both ends of the bulge portion forming the discharge space, and the discharge vessel Introduced and hermetically sealed through conductors inserted into the respective small diameter cylindrical parts, electrodes connected to the leading ends of the introduced conductors, halogen resistance formed on the surface of the introduced conductors or the inner surface of the small diameter cylindrical parts An arc tube comprising an electron-emitting material layer, a metal halide sealed in the discharge vessel and a discharge medium containing a starting gas; electrically connected to an introduction conductor of the arc tube and holding the arc tube A pair of power supply members; and a proximity member connected to the power supply member so as to be at the same potential as the other electrode while being attached to the outer peripheral portion of the small-diameter cylindrical portion facing one of the introduction electron-emitting material layers of one introduction conductor With the conductor; And an outer tube in which a power feeding member holding the tube is sealed.

  In the present invention, a proximity conductor connected to a potential different from the introduction conductor inserted into the small-diameter cylindrical portion is provided on the outer periphery of the small-diameter cylindrical portion constituting the discharge vessel, and the inner conductor where the proximity conductor is located is provided. In this lamp, a halogen-resistant electron-emitting material layer is formed on the surface of the introduced conductor or the inner wall surface of the small-diameter cylindrical portion.

  In starting the lamp, a starting voltage is applied to the electrodes provided on the pair of introduction conductors and one introduction conductor and the proximity conductor connected in parallel to the pair of introduction conductors. By applying this voltage, the impedance is smaller than between the electrodes, and an easily electron emissive material layer is formed between the introduced conductor and the adjacent conductor, and correctly, the inner surface of the small-diameter cylindrical portion and the introduced conductor First, a slight discharge occurs in the slight gap.

  This voltage application and fine discharge rapidly increase the electron density in the discharge vessel, leading this discharge to the discharge between the electrodes, and easily starting the lamp to start lighting. Is normally lit.

  According to the present invention, by selecting the above-mentioned electron-emitting material from halogen-resistant and secondary electron-emitting materials, it is possible to sustain the occurrence of discharge over a long period with little deterioration and scattering due to halogen, that is, to prolong the life of the lamp. Can be measured.

  In addition, the said easily electron emissive substance layer and the adjacent conductor should just be provided in the at least one side of a pair of small diameter cylindrical parts.

  In the present invention and each of the following inventions, the definitions and technical meanings of terms are as follows unless otherwise specified.

<Discharge vessel for arc tube>
As materials for forming the discharge vessel of the arc tube, ceramics such as sapphire, aluminum oxide (alumina), yttrium-aluminum-garnet oxide (YAG), yttrium oxide (YOX) and aluminum nitride (AlN), Alternatively, a material having high heat-resistant translucency and high corrosion resistance from a halide, such as high silica glass mainly composed of silicon oxide such as quartz glass, borosilicate glass, or aluminosilicate glass, can be used.

  The above translucency means that the light generated by the discharge can be transmitted and emitted to the outside, and is not limited to being transparent, and may be light diffusive. The portion that does not mainly emit radiation may be light-shielding.

  The shape of the discharge vessel may be a cylindrical shape, an elliptical shape with a bulged central portion, a spherical shape, or a composite of these shapes, and the bulging portion may be integrally formed with the bulging portion or separately formed at both ends. A small-diameter cylindrical portion joined together is provided, and an end portion of the small-diameter cylindrical portion is sealed and hermetically closed.

  When the discharge vessel is made of ceramics, the sealing part at the end is made by interposing the introduction conductor directly in the small-diameter cylindrical part, or by mixing with metal, cermet (ceramics and tungsten (W), molybdenum (Mo), etc. Conductive material obtained by sintering powder.) A plug body made of ceramic or ceramics that penetrates the lead conductor or that is connected to the inside or outside of the tube is interposed at the end of the small-diameter cylindrical portion, and a heat-resistant adhesive is used. Airtightly sealed.

This heat-resistant adhesive has the same or similar thermal expansion coefficient as the discharge vessel material and the sealed portion of the lead conductor and is thermally resistant to about 600 ° C., for example, dysprosium-aluminum-silicon oxide ( DyO ₃ —Al ₂ O ₃ —SiO ₂ ) and other compounding agents (also called glass sealing agents) and molybdenum (Mo) -aluminum oxide (Al ₂ O ₃ ) and other metallized paste ceramics A filler such as a heat-resistant adhesive is used, and it is hermetically sealed by being applied or filled in a portion to be sealed, heated, melted and solidified.

  In addition, when the discharge vessel is made of glass, the introduction conductor is provided with a linear or foil-like sealing or external introduction conductor made of a material having the same or similar thermal expansion coefficient as that of the glass. The sealing portion is interposed in the container end, and the container end is heated and melted and hermetically sealed by means such as crushing or squeezing.

  Further, although not limited depending on the rating of the lamp, the inner diameter of the cylindrical, oval, spherical and other parts forming the discharge space of the discharge vessel is about 4 to 30 mm, and the inner total length is 10 to 90 mm. About 0.02 to 20 cc, preferably about 0.2 to 10 cc can be used.

<Introduction conductors and electrodes>
The introduction conductor has a function of connecting to and supporting the electrode, supplying a discharge current to the electrode, and being fixed in the small-diameter cylindrical portion.

  When the discharge vessel is made of ceramic, the introduction conductor is made of glass such as niobium (Nb), tantalum (Ta), titanium (Ti), zirconium (Zr), hafnium (Hf), vanadium (V), or platinum (Pt). In this case, tungsten provided with an electrode on an externally introduced conductor formed in a non-empty rod shape, tubular shape, foil shape or the like that also serves as a sealing member made of a sealing metal such as molybdenum (Mo) or tungsten (W). (W) or two members directly welded with an electrode shaft made of doped tungsten, or a total of two or two in series via an intermediate conductor for power feeding made of one or two conductive members such as molybdenum (Mo) or cermet between the two members It consists of four members connected by means such as butt welding.

  The material for the externally introduced conductor should be selected according to the thermal expansion coefficient of the ceramic discharge vessel and heat-resistant adhesive material, and the intermediate conductor should be appropriately selected for the material that can reduce the halogen resistance and the difference in thermal expansion coefficient. is required. In addition, the external introduction conductor can be led out from the end of the small-diameter cylindrical portion directly to the outside or via another connection conductor to support the arc tube.

  The electrode shaft portion of the electrode functions to fix the electrode at a predetermined position with respect to the discharge vessel and to introduce an electric current from the outside. As described above, the base end portion is fixed to the distal end of the introduction conductor. By doing so, the connection is supported electrically and mechanically.

  The electrodes are arranged so that a pair of the electrodes face each other in the container, and even if the tip of the electrode shaft also serves as the electrode directly, or in order to increase heat dissipation by increasing the surface area, A coil made of a tungsten (W) wire or a doped tungsten wire can be wound around the part.

  In addition, the electrode shaft located in the small diameter cylindrical portion or the intermediate power feeding conductor has a minimum distance of 0.1 mm or less (may be in contact) between the outer surface thereof and the inner surface of the small diameter cylindrical portion. It is preferable that it is inserted through. As a means for reducing the distance (may be in contact), a wire made of a material such as tungsten (W) or molybdenum (Mo) is wound around a part of the insertion member in a coil shape, or a plate material is piped. You may make it respond | correspond by winding what was shape | molded in the shape.

<Easy electron radioactive material layer>
The easy-electron emitting material layer is made of magnesium (Mg), lanthanum (La), cerium (Ce), yttrium (Y), etc. that has low resistance to metal halides for light emission and exhibits secondary electron emission. It is made of a material containing at least one of oxides and formed on at least one of the surface of the introduction conductor close to the electrode and the adjacent conductor, or the inner surface from the small diameter cylindrical portion or the small diameter cylindrical portion to the bulging portion Is done.

  The easily electron emissive material layer can be formed by spraying a suspension of the above-mentioned substance powder and an organic binder, applying by brushing or dipping, or by a sol-gel method or sputtering method. The thickness of the layer (film) is preferably about 10 nm to 100 μm. If the layer (film) thickness is too thin, the electron emission ability is low. On the other hand, if it is too thick, it is difficult to remove impurities remaining in the layer. This is not preferable because it adversely affects the lamp characteristics.

<Discharge medium>
The discharge medium consists of a light emitting metal halide and a rare gas for starting and buffering, and the type and amount of the light emitting properties such as luminous efficiency, color rendering and color temperature, lamp power, and the contents of the arc tube container. It can be selected according to the product.

  Examples of the luminescent metal include mercury (Hg) (including amalgam), sodium (Na), thallium (Tl), indium (In), lithium (Li), cesium (Cs), dysprosium (Dy), holmium ( Ho), thulium (Tm), scandium (Sc), neodymium (Nd), cerium (Ce) and other rare earth metals, and halogens such as iodine (I), bromine (Br), chlorine (Cl) and fluorine ( Any one or more of F) can be used. In addition, the said halide contains what is enclosed not only for light emission but for electrical property adjustment.

  Argon (Ar), neon (Ne), or the like is sealed as a starting and buffer gas, but other rare gases can be sealed as needed. The rare gas is sealed in the discharge vessel so as to exhibit a pressure of about 101.3 kPa (about 1 atm) or more during lighting.

<About the outer tube>
An outsider is an envelope that houses an arc tube, and is made of a light-transmitting and heat-resistant material made of hard glass such as quartz glass or borosilicate glass, glass such as semi-hard glass or soft glass, or ceramics. A-type, AP-type, B-type, BT-type, ED-type, R-type, T-type, etc. are inserted, a mount holding the arc tube is inserted from the opening at the end, and this opening is heated with a burner. A sealing portion is formed in which the mount is sealed by melting and closing. In the case of an outer tube such as a T (straight tube) type, sealing portions may be formed at both ends.

The inside of the outer tube may be a vacuum atmosphere or an inert gas atmosphere in which a rare gas such as nitrogen (N ₂ ) or argon (Ar) is sealed.

<About the power supply member>
The power supply member is connected to the sealing metal portion where the portion sealed in the sealing portion of the outer tube is airtight and familiar with the glass, and one end side of the sealing metal, and extends into the outer tube. It comprises a support member that is electrically connected to the arc tube and the like, and that is fixedly supported, and an external lead that is connected to the other end of the sealing metal and led out of the outer tube.

  The support member is made of a wire or plate material such as molybdenum (Mo), tungsten (W), niobium (Nb), or stainless steel, and is formed in a substantially linear shape, a substantially rectangular shape, or a substantially U-shaped frame shape. It is electrically connected to the outer conductor led out from the end, and the arc tube and the starting auxiliary circuit component are arranged and fixed along the tube axis. The external lead is made of a wire such as molybdenum (Mo) or nickel (Ni), and is connected to a shell of a cap-shaped base, an eyelet terminal, or a pin-shaped terminal.

  In addition, what is necessary is just to select suitably forms, such as a material of the said structure, a dimension, according to the kind of arc tube, electric power, weight, an outer tube material, etc.

  Further, a getter such as a zirconium Zr-aluminum (Zr-Al) alloy that cleans the inside of the outer tube may be provided on a support member in the outer tube.

<About proximity conductors>
The proximity conductor is attached to the outer peripheral portion of the small-diameter cylindrical portion through which one introduction conductor is inserted, and is electrically connected to the power supply member so as to have the same potential as the other electrode.

  More specifically, one or several turns in the state where the proximity conductor is close to or in contact with the outer surface of the base portion of the small diameter cylindrical portion facing the portion where the electron emissive material layer is formed so as to be closest to the electron emissive material layer. It is provided in a coil shape along the container shaft and locked by means such as twisting or engaging.

  As the proximity conductor, a conductive material that is the same or different from the power supply member and processed into a linear shape, a plate shape, or a mesh shape can be used.

<About the base>
The base is a lamp component that holds the main body of the high-pressure discharge lamp in a socket and performs a function of electrically connecting to a power source. In the present invention, a screw type (E type or the like), a plug type (G type or S type). Various known structures such as a pinless insertion type and a bipost type base can be adopted.

  The adhesive used for joining and supporting the outer tube and the base is not particularly limited as long as it can withstand the operating temperature during lighting of the high-pressure discharge lamp. In general, a heat-resistant ceramic-based inorganic adhesive is suitable, but it may be fixed by mechanical means such as unevenness and caulking without using an adhesive.

<Others>
An intermediate tube made of a heat-resistant and translucent material made of ceramics, quartz glass or hard glass can be provided surrounding the arc tube. With this middle tube, the arc tube can be kept warm, the luminous metal can be easily actuated to improve the luminous characteristics such as high efficiency and high color rendering, and at the same time, it can be protected in the unlikely event that the arc tube container is broken.

  Further, by supporting the arc tube and the middle tube by a member that does not apply an electric potential, it is possible to prevent sodium (Na) ions and the like from coming out of the arc tube container due to photoelectron action during lighting, and to suppress a decrease in luminous efficiency of the lamp.

  Furthermore, it is possible to provide an enhancer (ultraviolet ray generation source) in the outer tube together with the arc tube as a lamp starting auxiliary member, and the starting performance can be further improved.

  The high-pressure discharge lamp of the invention of claim 2 is characterized in that the electron-emitting material layer contains at least one of oxides of magnesium, lanthanum, cerium, and yttrium.

Substances including easily electron-emitting magnesium oxide (for example, MgO), lanthanum oxide (for example, La ₂ O ₃ ), cerium oxide (for example, CeO ₃ ), yttrium oxide (for example, Y ₂ O ₃ ), etc. It is a low work function substance that exhibits low halogen resistance and secondary electron emissivity, and has a high electron emission capability due to particle collision, and can easily cause discharge by increasing the electron density in the discharge vessel. it can.

  An illuminating device according to a third aspect of the present invention comprises: an illuminating device main body; and the high-pressure discharge lamp according to claim 1 or 2 provided in the main device body; and a lighting circuit device for lighting the high-pressure discharge lamp. It is characterized by being.

  Since the lamp with improved starting characteristics is provided, a predetermined brightness can be obtained in a short time after energization, and the lighting circuit member can be reduced in pressure by lowering the starting voltage.

  Further, the lighting device body refers to the remaining parts such as a casing, a reflecting mirror, a translucent cover, and a lens including the lighting fixture and excluding the high-pressure discharge lamp and the lighting circuit means from the lighting device, but all of these members. Is not essential.

  As a lighting means of the high-pressure discharge lamp, a rectangular wave lighting circuit type, a magnetic excitation type ballast such as a choke coil type or a transformer type can be used.

  In the present invention, the lighting device is a broad concept including all devices that use the light emission of the high-pressure discharge lamp for some purpose. For example, the present invention can be applied to a bulb-type high-pressure discharge lamp, a lighting fixture, a moving body headlamp, an optical fiber light source device, an image projection device, a photochemical device, a fingerprint discrimination device, and the like.

  According to the invention of claim 1, the halogen-resistant electron-emitting material layer is formed on the introduction conductor surface or the inner surface of the small-diameter cylindrical portion facing the adjacent conductor provided on the outer periphery of the small-diameter cylindrical portion of the arc tube container. This suppresses the reaction with the metal halide enclosed in the arc tube, and at the time of starting the lamp, the electron emission capability is high and desired electron emission can be easily performed over a long period of time. It is possible to provide a high-pressure discharge lamp that can improve starting characteristics such as a low starting voltage.

  According to the invention of claim 2, the electron-emitting material is an oxide such as magnesium (Mg), lanthanum (La), cerium (Ce), yttrium (Y), and these substances are described in claim 1 above. It is effective.

  According to the invention of claim 3, since the high-pressure discharge lamp having the effect described in claim 1 or 2 is provided, the lighting circuit has excellent starting characteristics and low withstand voltage (insulation) due to a low starting voltage. It is possible to provide a lighting device such as a lighting fixture that can use members and reduce material costs.

It is a schematic front view which shows embodiment of the high pressure discharge lamp of this invention. It is an expanded sectional front view which shows the arc_tube | light_emitting_tube part in FIG. (A) And (b) figure is explanatory drawing which expands and shows the small diameter cylindrical part vicinity part which formed the electron-electron radioactive substance layer in FIG. It is a schematic front view of the principal part which shows other embodiment of the high pressure discharge lamp of this invention. It is a partial cross section front view which shows embodiment of the illuminating device of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 is a front view of a high pressure discharge lamp, FIG. 2 is an enlarged sectional front view showing the arc tube portion in FIG. 1, and FIG. 3 (a) is an enlarged sectional view of one small-diameter cylindrical portion in FIG. It is explanatory drawing shown.

  The high-pressure discharge lamp L1 includes an arc tube 1A, an intermediate tube 75 surrounding the arc tube 1A, and an outer tube that supports the arc tube 1A and the intermediate tube 75 and houses a pair of power supply members 4A and 4B that supply power. 7 and a base 8 provided at the end of the outer tube 7. In addition, the middle pipe 75 in the drawing is not essential.

  The arc tube 1A is a translucent ceramic in which a pair of small-diameter cylindrical portions 12a and 12b having a smaller inner diameter than a bulging portion connected to both ends of a substantially spherical bulging portion 11 by a continuous curved surface are connected. For example, a discharge vessel 1 made of aluminum oxide (alumina) is provided, and electrodes 20a and 20b are spaced apart from each other by a predetermined interval at the tip portion that penetrates the small-diameter cylindrical portions 12a and 12b of the discharge vessel 1 and faces the bulging portion 11. The hollow lead-like or tubular lead-in conductors 2A and 2B provided with the above are hermetically sealed at the ends of the small-diameter cylindrical portions 12a and 12b with ceramic heat-resistant adhesives 13 and 13, respectively.

  The introduction conductors 2A and 2B have niobium (Nb) wires as hermetic sealing portions with the small-diameter cylindrical portions 12a and 12b and external introduction conductors 21, and molybdenum (Mo) wires are intermediate conductors 22 to the niobium (Nb) wires. In addition, a tungsten (W) wire is connected to the molybdenum (Mo) wire as an electrode shaft 23. This connection is made by means such as butt welding, and the three members are configured as a single straight lead-in conductor 2A, 2B.

  At this time, the gap between the outer surface of the introduction conductors 2A and 2B penetrating through the small diameter cylindrical portions 12a and 12b and the inner wall surface of the small diameter cylindrical portions 12a and 12b is 0.1 mm or less, and the gap is large. The coil 25 made of a thin wire such as molybdenum (Mo) may be wound from the electrode shaft 23 or the intermediate conductor 22 to the electrode shaft 23 to reduce the gap, and the outer surface of the coil 25 has a small diameter cylindrical portion 12a. , 12b may be in contact with the inner wall surface.

  Each of the electrodes 20a and 20b is configured as a coiled electrode 24 in which a tungsten (W) wire is wound around the tip of the electrode shaft 23. However, the coil 24 is not essential, and the electrode shaft 23 The tip of itself may perform an electrode action.

Further, an electrode including at least one of the introduction conductors 2A and 2B inserted into the small diameter cylindrical portions 12a and 12b, in this case, the coil 25 portion wound around the lower introduction conductor 2B as shown in FIG. On the surface of the shaft 23, an easily electron emissive material layer 3 coated with magnesium oxide (MgO ₂ ) powder is formed.

Further, in the discharge vessel 1 of the arc tube 1A, a starting and buffer gas containing argon (Ar) or the like as a discharge medium, and sodium iodide (NaI), thallium iodide (TlI), indium iodide (as a light emitting metal) Metal halides such as InI) and thulium iodide (TmI ₃ ) and mercury (Hg) are enclosed.

The outer tube 7 is formed in a T-shape (straight tube shape), which is made of borosilicate glass or the like and is closed in advance on the one end side (upper side in the figure), and the arc tube 1A is provided in the opening on the other end side (lower side). A sealed portion (not shown) closed by welding the supported stem 4s is formed. The inside of the outer tube 7 is a vacuum atmosphere evacuated through an exhaust pipe (not shown) after forming the sealing portion, or a rare gas atmosphere such as low-pressure nitrogen (N ₂ ) or argon (Ar). Reference numeral 49 denotes a getter.

  The pair of power supply members 4A and 4B is connected to one end side of internal lead wires 41a and 41b extending from a sealing wire (not shown) hermetically sealed to the stem 4s and extends into the outer tube 7. A long support member 42a that also serves as a power supply made of a wire or plate material such as molybdenum (Mo) or stainless steel, a support member 42b that is short and substantially linear, and is connected to the other end and extends outside the outer tube 7. It consists of external leads 43a and 43b made of molybdenum wire or the like.

  The one support member 42a is connected to the internal lead wire 41a at a portion bent in a substantially V shape, and is bent and extended so that the distal end side is separated and extends substantially in parallel along the outer tube 7 axis. The tip portion is disposed so as to elastically contact the top side inner wall surface of the outer tube 7 having a T shape.

  In addition, support members 44a and 44b, which are formed in a donut shape or a strip shape with a metal plate or a ceramic plate or the like at the intermediate portion of the parallel support members 42a, are directly spaced apart from each other. The support members 42a and 42a are connected to each other by welding or attached via a fixing member, and the spaced apart support members 42a and 42a are bridged and held. The support members 44a and 44b are preferably formed so as not to shield visible light and ultraviolet rays as much as possible.

  The small-diameter cylindrical portions 12a and 12b of the arc tube 1A discharge vessel 1 are inserted and loosely fitted in through holes formed in the center of the donut-shaped support members 44a and 44b, and the arc tube 1A is surrounded by the holes. The intermediate tube 75 is fixed via fixing members 45,... In a state of being sandwiched between the support members 44a, 44b from above and below.

  Further, the support member 44a connected to one support member 42a and the externally introduced conductor 21 led out from the arc tube 1A are electrically connected via a conductor 46, and the other substantially linear support member 42b is It is electrically connected to the other external introduction conductor 21 through a conductor 47 connected to the tip.

  Reference numeral 5 denotes a starting auxiliary conductor, which is made of a metal wire such as an iron-nickel (Fe-Ni) alloy, a metal foil, or a mesh, and has one end fixed to the power supply member 4A (support member 42a). It is electrically connected to the member 44a and extends along the outer wall surface of the discharge vessel 1 from the small diameter cylindrical portion 12a through the bulging portion 11 to the vicinity of the base of the other small diameter cylindrical portion 12b.

The proximity conductor 5 is wound and locked on the outer peripheral surface in the vicinity of the base portion of one small-diameter cylindrical portion 12a by one to several turns, and the tip portion is inserted through the other small-diameter cylindrical portion 12b. A coiled portion 51 wound around one or several turns is formed on the outer periphery in the vicinity of the base portion of the cylindrical portion 12b facing the formation site of the electron emissive material layer 3 such as the electrode shaft 21, and the end portion is bound or band-shaped. It is locked by means such as fixing with a member.

  Reference numeral 6 denotes an ultraviolet ray generation source (enhancer), which is a lead wire also serving as a sealing wire made of molybdenum (Mo) wire in a sealing portion 62 formed at the end of an airtight container 61 made of ultraviolet transparent quartz glass or the like. 63 is hermetically sealed, and an internal electrode (not shown) constituting a foil-like internal conductive member is connected in the airtight container 61. The airtight container 61 is filled with a rare gas such as argon (Ar).

  An outer electrode 64 constituting a linear, plate-like, or mesh-like external conductive member made of an iron-nickel (Fe-Ni) alloy or the like is spiraled one or more times on the outer peripheral portion of the ultraviolet light permeable hermetic container 61. The other end of the external conductive member (external electrode 64) is on the support member 42b, and the other end of the internal conductive member (internal electrode (not shown)) is on the support member 42a. Electrically connected.

  That is, the portions of the power supply members 4A and 4B such as the support members 42a and 42b and the support member 44a that extend into the outer tube 7 are the introduction conductors 2A and 2B at both ends of the arc tube 1A and the ultraviolet light source (enhancer) 6. The inner and outer conductive members (inner electrode (not shown), outer electrode 65) and the power source are electrically connected in parallel to supply power, and the arc tube 1A is disposed and held along the outer tube 7 axis. The proximity conductor 5 provided on the outer periphery of the other small-diameter cylindrical portion 12b is connected to have the same potential as the introduction conductor 2A inserted into the one small-diameter cylindrical portion 12a.

  The sealing portion of the outer tube 7 is provided with a cap 8 according to the type and application, and the external leads 43a and 43b are connected to the terminal portion of the cap 8 to constitute a metal halide lamp. The lamp L1 is completed.

  In the discharge lamp L1, the lamp L1 is energized from a lighting circuit device having a base and a ballast (not shown) with the base 8 attached to a socket.

  The discharge lamp L1 connected to the lighting circuit device is, at the time of start-up, an arc tube through external leads 43a, 43b connected to the base 8, internal lead wires 41a, 41b, power feeding members 4A, 4B (support members 42a, 42b). Introduced conductors 2A, 2B in 1A--electrodes 20a, 20b and internal electrodes (not shown) of ultraviolet ray source (enhancer) 6 connected in parallel to power supply members 4A, 4B (support members 42a, 42b), external A high voltage pulse is applied to the adjacent conductor 5 connected to the electrode 64 and the introduction conductor 3A side of one small diameter cylindrical portion 12a.

  By the application of the high-voltage pulse, in the other small-diameter cylindrical portion 12b in the arc tube 1A, the proximity conductor 5 wound around the outer peripheral surface and the introduction conductor 2B portion inserted inside the proximity conductor 5 are provided. A slight discharge occurs between them.

In the present invention, since the electron-emitting material layer 3 having a high electron emission capability is formed on the surface of the electrode shaft 23 and the coil 25 of the inner introduction conductor 2B where the proximity conductor 5 is located, Increase the electron density of the adjacent conductor 5 and the introduction conductor 2B.
The transition from the slight discharge between the electrodes 20a and 20b to the discharge between the electrodes 20a and 20b can be promoted.

  In addition, dielectric breakdown also occurs between the internal electrode 64 and the external electrode 65 of the ultraviolet ray generation source (enhancer) 6 whose impedance is smaller than that between the electrodes 20a and 20b, and argon (Ar) enclosed in the hermetic vessel 61 is excited. Then, ultraviolet rays are generated, and the ultraviolet rays pass through the wall of the airtight container 61 and are emitted to the outside.

  Since a part of the ultraviolet rays emitted from the ultraviolet ray generation source (enhancer) 6 passes through the wall of the bulging portion 11 of the discharge vessel 1 and irradiates the inside of the discharge space, argon (Ar) enclosed in the discharge vessel 1 The starting voltage including the above and the buffer gas are excited, so that the starting voltage of the lamp L1 can be lowered, and the occurrence of discharge between the electrodes 20a and 20b can be promoted.

  That is, the easy-electron emitting substance layer 3 is formed on the surface of the introduction conductor 2B facing the proximity conductor 5 and a starting auxiliary body including an ultraviolet ray generation source (enhancer) 6 is also provided. The electron density in 1A can be rapidly increased and transferred to the discharge between the electrodes 20a and 20b, and the above-mentioned electron-emitting material made of magnesium oxide (MgO) has little deterioration and scattering due to halogen and is long-lasting. It was possible to sustain the occurrence of discharge.

  Therefore, by forming the easy electron emissive material layer 3 made of the halogen-resistant material on the surface of the introduction conductor 2B facing the adjacent conductor, the start time of the lamp L1 can be reduced over a long period of time or the start voltage can be reduced. It was possible to provide an inexpensive lighting circuit device such as the use of a high-pressure discharge lamp L1 with improved characteristics and a lighting circuit member having a low withstand voltage (insulation) level due to voltage drop.

The starting time is a time required for dielectric breakdown between the electrodes 20a and 20b from voltage application, and is generally on the order of several tens of milliseconds to several seconds.
Further, in the above embodiment, the ultraviolet ray generation source (enhancer) 6 is also provided as a starting auxiliary body, but the ultraviolet ray generation source (enhancer) 6 is not essential and corresponds to the proximity conductor 5 on the outer periphery of the small diameter cylindrical portion 12b. Even in a lamp in which only the electron-emitting material layer 3 is formed on the introduced conductor 2B, the starting characteristics can be improved.

  FIG. 4 is a schematic front view showing a main part of another embodiment of the high-pressure discharge lamp according to the present invention. In FIG. 4, the same parts as those shown in FIGS. .

  In this lamp L2, the arc tube 1A shown in FIG. 2 is sealed in a straight tube (T) -shaped outer tube 7 made of hard glass such as quartz glass. Sealing members 48 and 48 made of molybdenum (Mo) foil are hermetically sealed to the crushing sealing portion 71 on one end side of the outer tube 7, and the internal lead wires connected to the sealing members 48 and 48, respectively. The arc tube 1A is supported along the outer tube 7 axis and electrically connected to the power supply members 4A and 4B which also serve as the support members 42a and 42b.

  More specifically, one power supply member 4A extending substantially in parallel has an outer introduction conductor 21 led from one small-diameter cylindrical portion 12a of the arc tube 1A with its distal end bent substantially at a right angle, and the other The power supply member 4B is connected to the external introduction conductor 21 led out from the other small diameter cylindrical portion 12b through the conductor 47.

Further, the surfaces of the electrode shafts 23 (not shown) and the coils 25 (not shown) of both lead-in conductors 2A and 2B inserted through the small-diameter cylindrical portions 12a and 12b of the arc tube 1A have a high electron emission capability. An electron emissive material layer 3 (not shown) made of magnesium oxide (MgO ₂ ) similar to that described above is formed. In addition, a coil-like portion 51 formed on one end side is wound around the outer periphery corresponding to the easy-electron radioactive material layer 3 (not shown) of the base portions of the small-diameter cylindrical portions 12a and 12b, and the other end side is the small-diameter tube. Proximity conductors 5 connected to power supply members 4A and 4B that are at different potentials from the introduction conductors 2A and 2B that pass through the inside of the shaped portions 12a and 12b are provided.

  That is, in FIG. 4, the upper small diameter cylindrical portion 12a is provided with the proximity conductor 5 connected to the power supply member 4B side, and the lower small diameter cylindrical portion 12b is provided with the proximity conductor 5 connected to the power supply member 4A side. . In the figure, reference numeral 72 denotes an exhaust pipe tip provided at the other end of the outer pipe 7, and 40 and 40 denote insulation that fixes the pair of power supply members 4A and 4B by bridging and sandwiches the small-diameter cylindrical parts 12a and 12b. It is a bridge made of things.

  The high-pressure discharge lamp L2 has an external lead connected to the base 8 at start-up as in the case of the discharge lamp L1 when the base 8 is attached to the socket and energized through a lighting circuit device including a ballast (not shown). (Not shown)-Sealing members 48, 48- Feeding members 4A, 4B (internal lead wires 41a, 41b, support members 42a, 42b) through the introduction conductors 2A, 2B of the arc tube 1A-electrodes 20a, 20b and A high voltage pulse is applied to the adjacent conductors 5 and 5 connected to both the small diameter cylindrical portions 12a and 20b.

  By the application of the high-voltage pulse, the conductive conductors 2A and 2B inserted through the small-diameter cylindrical portions 12a and 12b and the adjacent conductors 5 and 5 to which different potentials are applied to the inner conductive conductors 2A and 2B, That is, a slight discharge is generated at the site where the electron-emitting material layer 3 of both the introduction conductors 2A and 2B is formed, and the transition of this slight discharge to the discharge between the electrodes 20a and 20b is promoted, so that the lamp L2 can be used. The same effect as that of the lamp L1 of the above embodiment that can be lit in a shorter time and with a lower starting voltage than the lamp of the configuration is exhibited.

  FIG. 5 is a partial cross-sectional front view showing an outline of an embodiment of a lighting device (or called an appliance) 9 according to the present invention using, for example, the high-pressure discharge lamp L1.

  The illuminating device 9 is an embedded illuminating device embedded in a ceiling 91 or the like, and has a fixture (device) main body 92 attached to the ceiling 91 side, and a socket provided in the fixture (device) main body 92. A base 8 of the high-pressure discharge lamp L1 is attached to 93.

  In addition, a reflecting mirror 94 that reflects the emitted light of the lamp L1 downward is disposed in the instrument (device) main body 92, and a translucent glass plate provided so as to cover the opening of the reflecting mirror 94. The light control body 95 which consists of a cover member which consists of these etc., a lens, etc. is arrange | positioned.

  The illuminating device 9 is attached to a ceiling surface of a department store or the like with the opening side of the reflecting mirror 94 facing downward, for example, in a fixture (device) main body 92 or a ballast disposed separately from the main body 92. It is electrically connected to a lighting circuit device (not shown) having it, and the lamp L1 can be lit by power feeding from the lighting circuit device.

  And since this lighting device 9 is equipped with the above-described discharge lamp L1, it is possible to shorten the time required for starting (lighting) and to use a lighting circuit member having a low withstand voltage (insulation) property by lowering the starting voltage. There are advantages such as possible and inexpensive equipment.

The present invention is not limited to the above embodiment. For example, in the embodiment, magnesium oxide (MgO) is used as a material for forming the easily electron emissive material layer 3 used in the arc tube 1A of the high-pressure discharge lamps L1 and L2. A substance containing a lanthanum oxide (for example, La ₂ O ₃ ), cerium oxide (for example, CeO ₃ ), yttrium oxide (for example, Y ₂ O ₃ ), etc., which has a small reaction with a metal halide and exhibits secondary electron emission. The main component can be used, and even if one or more kinds of these materials are mixed and used, the same effect can be obtained.

In addition, the electron-emitting material layer 3 is formed by, for example, using a suspension made of a powder made of magnesium oxide (MgO ₂ ) having a particle size of about 10 nm to 100 μm and an organic binder such as butyl acetate as the electrode shaft 23. Further, it can be formed by applying a brush, dipping or spraying to a predetermined portion of the surface of the coil 25 and then heating to remove the binder by evaporation, or by sol-gel method or sputtering method. .

  Further, the position where the electron-emitting material layer 3 is formed is not limited to the surface of the electrode shaft 23 shown in FIG. 3A near the electrodes 20a and 20b of the introduction conductors 2A and 2B, but the small-diameter cylindrical portions 12a and 12b. Even if it is formed on the inner surface of the container 1 extending from the small diameter cylindrical portions 12a, 12b and the small diameter cylindrical portions 12a, 12b to the bulging portion 11 shown in FIG. Has the same effect as. Moreover, even if it is formed on both the surfaces of the introduction conductors 2A and 2B and the inner surface of the container 1, the same effect can be obtained. Therefore, it is only necessary to be formed on at least one of the small diameter cylindrical portions 12a and 12b.

  In addition, the formation of the electron emissive material layer 3 and the proximity conductor 3 is not limited to the one small-diameter cylindrical portion 12b side, but may be formed in both small-diameter cylindrical portions 12a and 12b.

  Further, in this type of high-pressure discharge lamp, it is known that a lamp enclosing mercury (Hg) for light emission and the like can be expected to reduce the starting voltage due to the Penning effect of mercury (Hg) -argon (Ar) at the time of starting.

  In the above-described embodiment of the present invention, the arc tube 1A in which mercury (Hg) is not enclosed as a metal for light emission has been described. Of course, even in the case of the arc tube 1A in which mercury (Hg) is enclosed, this The invention can be applied to provide a lamp that exhibits the above-described effects in addition to the effects of mercury (Hg).

  Furthermore, the illumination device 9 is not limited to the above embodiment, and may have another structure. Applications include general lighting equipment, sports, lighting equipment for facilities such as public facilities and factories, headlamps, light source devices for optical fibers, image projection devices, photochemical devices, etc. It can be used for a lighting device (apparatus) using a lamp.

  The lamp is a metal halide lamp with a rated power of 150 W having substantially the same structure as that shown in FIGS.

The structural dimensions of the arc tube 1A are as follows. The discharge vessel 1 made of translucent alumina ceramics has a total length of about 55 mm, a bulge 11 length of about 20.5 mm, a maximum outer diameter of about 12.8 mm, and a maximum inner diameter of about 12. The inner volume is about 1.5 cm ³ at 5 mm, the length of the small diameter cylindrical portions 12 a and 12 b is about 17.3 mm, the outer diameter is about 3.0 mm, and the inner diameter is about 1.2 mm.

  The introduction conductors 2A and 2B inserted into the small-diameter cylindrical portions 12a and 12b are an external introduction conductor 21 made of niobium (Nb) wire having a length of about 12.0 mm and an outer diameter of about 1.1 mm, and the external introduction conductor. An intermediate conductor 22 comprising a molybdenum (Mo) wire having a length of about 3.0 mm and an outer diameter of about 0.5 mm and a tungsten (W) wire having a length of about 13.0 mm and an outer diameter of about 0.5 mm. Four members of an electrode shaft 23 made of a tungsten (W) wire having a length of about 2.5 mm and an outer diameter of about 0.75 mm connected to an intermediate conductor 22 made of a tungsten (W) wire are connected in series. The external introduction conductor 21 is hermetically sealed with a heat-resistant adhesive 13 at a position about 3 mm inserted from the opening of the end portions of the small diameter cylindrical portions 12a and 12b.

  A molybdenum (Mo) wire having an outer diameter of about 0.3 m is wound on the outer periphery of the intermediate conductor 22 made of molybdenum (Mo) wire of the introduction conductors 2A and 2B with a pitch interval of about 0.36 mm and a length of about 3.0 mm. The coil 25 is a coil in which a tungsten (W) wire having an outer diameter of about 0.3 mm is wound on the intermediate conductor 22 made of a tungsten (W) wire with a pitch interval of about 0.36 mm and a length of about 13.0 mm. 25, a tungsten (W) wire having an outer diameter of about 0.17 mm is wound about 7 turns at a pitch interval of about 0.17 mm at a position of about 1.0 mm from the tip of the electrode shaft 23 having a hemispherical tip. The coiled electrodes 24, 24 are provided with an interval of about 12 mm.

  Further, an easy electron made of magnesium oxide (MgO) by sputtering over the surface of the intermediate conductor 22 made of tungsten (W) wire over a range of about 4,0 mm on the surface including the coil 25 portion near the electrodes 20a and 20b. A radioactive material layer 3 is formed.

Further, in the discharge vessel 1, as a discharge medium, about 6 mg of thulium iodide (TmI ₃ ), about 2 mg of sodium iodide (NaI), about 1 mg of cesium iodide (CeI ₃ ), about 1 mg of calcium bromide (CaBr), iodine About 3 mg of zinc halide (ZnI) and about 1.2 atm (25 ° C.) of xenon (Xe) are enclosed.

   The proximity conductor 5 is made of a molybdenum (Mo) wire having an outer diameter of about 0.2 mm, and is connected so that one end side has the same potential as the introduction conductor 2A inserted through one small-diameter cylindrical portion 12a. The distal end portion is wound and fixed to the base portion of the small-diameter cylindrical portion 12b.

  Then, it was confirmed that the starting characteristics of the metal halide lamp L1 constructed by attaching the arc tube 1A and the like to the power supply members 4A and 4B shown in FIG.

L1, L2; high pressure discharge lamp, 1A; arc tube, 1; discharge vessel,
11: bulging part, 12a, 12b; small diameter cylindrical part, 2A, 2B; introduction conductor,
20a, 20b; Electrode, 3; Electron radioactive material layer,
4A, 4B: Power supply member, 5: Proximity conductor, 7: Outer tube, 9: Lighting device,
91; device body (housing),

Claims (3)

A translucent discharge vessel having a pair of small-diameter cylindrical portions having an inner diameter smaller than the bulge portions provided at both ends of the bulge portion forming the discharge space, and being inserted into each small-diameter cylindrical portion of the discharge vessel Air-sealed lead-in conductor and electrode connected to the leading end of the lead-in conductor, halogen-resistant easily electron-emitting material layer formed on the surface of the lead-in conductor or the inner surface of the small-diameter cylindrical part, inside the discharge vessel An arc tube comprising a metal halide sealed in and a discharge medium including a starting gas;
A pair of power supply members electrically connected to the lead conductor of the arc tube and holding the arc tube;
A proximity conductor that is attached to the outer peripheral portion of the small-diameter cylindrical portion facing one of the introduction electron-emitting material layers of one introduction conductor and connected to the feeding member so as to have the same potential as the other electrode;
An outer tube in which a power feeding member holding the arc tube is sealed;
A high-pressure discharge lamp comprising:   The high-pressure discharge lamp according to claim 1 or 2, wherein the easily electron emissive material layer contains at least one of magnesium, lanthanum, cerium, and yttrium oxides. A lighting device body;
A high-pressure discharge lamp according to claim 1 or 2 provided in the apparatus body;
A lighting circuit device for lighting this high-pressure discharge lamp;
An illumination device comprising:

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