JP2010080373A - High-pressure discharge lamp and lighting apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high pressure discharge lamp which suppresses an effect to lamp efficiency and light distribution characteristics to a minimum even if a phosphorescent member is used, is easy to be manufactured and can suppress manufacturing cost, and a lighting apparatus. <P>SOLUTION: The high pressure discharge lamp 11 is provided with an arc tube IT which has a pair of electrodes arranged in both ends of a translucent airtight container 1 and an ionizing medium, an outer tube OT, a connecting support S which is electrically connected to the pair of electrodes of the arc tube IT and supports the arc tube IT, a stem member 5 which seals the connecting support S and is installed at the end of the outer tube OT so as to be led out to the outside of the outer tube OT, and a phosphorescent member L which is installed on the surface of the stem member 5. In the high pressure discharge lamp 11, phosphorescence emitted from the phosphorescent member L is optically emitted into the arc tube IT, and electrons are discharged by a photoelectric effect from the inner face and the electrodes of the translucent airtight container 1, and these electrons act as initial electrons to cause discharging in the arc tube IT, and thereby, the high pressure discharge lamp 11 is easily started and lighted. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a high-pressure discharge lamp and an illumination device including the same.

  An ultraviolet enhancer is known as a kind of starting auxiliary means for a high-pressure discharge lamp (for example, see Patent Document 1). This enhancer consists of a small discharge tube and is placed in the outer tube adjacent to the arc tube. It is an ultraviolet source that irradiates the arc tube with ultraviolet rays emitted when starting the high pressure discharge lamp to assist the start of the high pressure discharge lamp. is there. That is, when the light emitting tube is irradiated with ultraviolet rays, electrons are emitted into the light emitting tube by the photoelectric effect, so that starting is facilitated. In a conventional ultraviolet enhancer, a rare gas such as argon alone or mercury is added as an ionization medium. Moreover, it is comprised so that dielectric barrier discharge may occur by making one of a pair of electrodes into an external electrode.

  However, since the ultraviolet enhancer is a means for generating electric discharge, its connection structure is complicated and manufacturing is complicated, and the number of parts increases, resulting in an increase in manufacturing cost.

On the other hand, a technique using a phosphorescent member as a light emitting means in place of the ultraviolet enhancer is known. The high-pressure discharge lamp using this phosphorescent member can improve startability without using an ultraviolet enhancer (see Patent Documents 1 and 2).
JP 2003-217515 A Special table 2007-519202 gazette

  Since the high-pressure discharge lamps described in Patent Documents 1 and 2 are such that the phosphorescent member is formed on the outer surface of the arc tube or the inner surface of the outer tube, the ratio at which the phosphorescent member blocks the light emission of the arc tube In many cases, the lamp efficiency is lowered, and the light distribution characteristics and emission chromaticity may be affected.

  The present invention has been made in view of the above problems, and even if a phosphorescent member is used, the influence on lamp efficiency and light distribution characteristics is minimized, and the high pressure that can be easily manufactured and can suppress the manufacturing cost. An object is to provide a discharge lamp and a lighting device.

A high-pressure discharge lamp of the present invention includes a translucent airtight container, a pair of electrodes disposed inside both ends of the translucent airtight container, and an arc tube including an ionization medium enclosed in the translucent airtight container; An outer tube containing an arc tube therein; a connection support provided inside the outer tube and electrically connected to a pair of electrodes of the arc tube to support the arc tube; and sealing the connection support A stem member provided at an end of the outer tube so as to lead out to the outside of the tube; and a phosphorescent member provided on the surface of the stem member.
The terms used in the present invention have their technical meanings interpreted by the following explanations unless otherwise specified.

  The material of the translucent airtight container is not particularly limited. Therefore, any of various known materials such as quartz glass and translucent ceramics may be used. Since it is desirable for the light transmittance radiated | emitted from a phosphorescent member to be high, in this invention, the combination with the translucent airtight container made from translucent ceramics is suitable. A translucent airtight container made of translucent ceramics is particularly suitable in the present invention because the coldest part temperature can be set high, the lamp voltage can be increased, and the luminous efficiency can be improved. As the translucent ceramic, translucent alumina, yttrium-aluminum-garnet (YAG), yttrium oxide (YOX), and polycrystalline non-oxide such as aluminum nitride (AlN) or single crystal Crystal ceramics or the like can be used. If necessary, it is allowed to form a halogen-resistant or metal-resistant transparent coating on the inner surface of the hermetic container or to modify the inner surface of the translucent hermetic container.

  Moreover, the translucent airtight container has a discharge space inside. And in order to enclose discharge space, the translucent airtight container is provided with the enclosing part. The surrounding portion has an appropriate shape such as a spherical shape, an elliptical spherical shape, or a substantially cylindrical shape. Various values can be selected as the volume of the discharge space according to the rated lamp power of the high-pressure discharge lamp, the distance between the electrodes, and the like. For example, in the case of a general illumination lamp, it can be any of 0.1 cc or more and the following depending on the rated lamp power. Further, if the maximum inner diameter of the translucent airtight container is set to 4 to 7 mm for the lamp power 100 W class and 3 to 5 mm for the 35 W class, the maximum distance between the electrodes can be maximized in order to obtain an appropriate lamp voltage. This is effective for keeping the temperature of the cold part high and keeping the luminous efficiency high.

  Further, it is allowed to have a pair of sealing portions at both ends of the surrounding portion. The pair of sealing portions are means for sealing the surrounding portion and supporting the shaft portion of the electrode here and contributing to airtight introduction of current from the lighting circuit to the electrode. It is arrange | positioned at the both ends of the part. When the material of the hermetic container is quartz glass, it is preferable to seal the metal as an appropriate hermetic sealing conduction means inside the sealing part in order to seal the electrode and introduce the current from the lighting circuit to the electrode in a hermetic manner. A structure in which a foil is embedded in an airtight manner can be employed. Note that the sealing metal foil is embedded in the inside of the sealing portion, and the sealing portion serves as a current conducting conductor in cooperation with the sealing portion in order to keep the inside of the enclosure portion of the translucent airtight container airtight. When the translucent airtight container is made of quartz glass, molybdenum (Mo) is the most suitable material. The method of embedding the sealing metal foil in the sealing portion is not particularly limited, but can be appropriately selected and employed from, for example, a reduced pressure sealing method, a pinch sealing method, and a combination thereof.

  On the other hand, as a sealing means when the light-transmitting hermetic container is made of light-transmitting ceramics, for example, instead of frit sealing or frit glass in which frit glass is poured between the light-transmitting ceramics and the introduction conductor and sealed. Various sealing means such as metal sealing using metal and means for melting the opening to be sealed of the translucent ceramic hermetic container and directly or indirectly sealing to the current introduction conductor are selectively selected as desired. Can be adopted. In order to maintain the lowest temperature of the discharge space formed in the light-transmitting hermetic container at a desired relatively high temperature while maintaining the sealing portion of the light-transmitting hermetic container at a required relatively low temperature. In addition, a small-diameter cylindrical portion communicating with the surrounding portion can be formed. In the case of this structure, the sealing portion is disposed at the end portion of the small diameter cylindrical portion, and is called a capillary between the electrode shaft and the inner surface of the small diameter cylindrical portion by extending the electrode shaft in the small diameter cylindrical portion. A slight gap is formed along the axial direction of the small-diameter cylindrical portion.

  The pair of electrodes constitutes a high-pressure discharge lamp of a type in which an electroded discharge is generated by a pair of electrodes that are sealed in a light-transmitting hermetic container and disposed so as to face the discharge space.

  In addition, as a constituent material of the electrode, a fire-resistant and conductive metal such as pure tungsten (W), a dopant (for example, scandium (Sc), aluminum (Al), potassium (K), and silicon (Si), etc. It can be formed using doped tungsten containing one or more selected from the group, tritium tungsten containing thorium oxide, rhenium (Re), tungsten-rhenium (W-Re) alloy, or the like.

  Further, in the case of a small lamp, a straight rod-shaped wire or a wire having a large diameter portion at the tip can be used as the electrode. In the case of a medium or large electrode, a coil made of an electrode constituent material can be wound around the tip of the electrode shaft. Note that the pair of electrodes have the same structure when operated with alternating current, but when operated with direct current, the anode generally has a large temperature rise, so that the heat radiation area is larger than the cathode, and therefore the main part should be thick. Can do.

  Furthermore, when the light-transmitting hermetic container is a light-transmitting ceramics hermetic container having a small-diameter cylindrical portion and a small gap called a capillary is formed inside the small-diameter cylindrical portion, the electrode shaft portion can be formed as desired. An electrode mount subcoil such as a refractory metal such as tungsten or molybdenum can be wound around the substrate.

  The ionization medium is not particularly limited in the present invention. In general, it consists of a starting gas, a luminescent material and a buffer material which mainly forms a lamp voltage. The luminescent material may be either gas or vapor. As an embodiment of a vapor-like luminescent material that is known to obtain high luminous efficiency, it is allowed to constitute a metal halide lamp by enclosing a luminescent metal halide. The light emitting metal of the metal halide lamp is not particularly limited, but for example, one or more selected from the group of rare earth metals, scandium (Sc), and sodium (Na) can be the main component. As the rare earth metal, for example, thulium (Tm) and holmium (Ho) are suitable. Thulium emits a number of emission line spectra near the peak wavelength of the luminous characteristic curve at the time of discharge, and the emission peak coincides with the peak of the luminous efficiency curve, which is an extremely effective light emitting metal to improve luminous efficiency. It is. However, these metal halides are mainly metal halides that contribute to light emission, but also have an action of increasing the lamp voltage in a mercury-free manner. For this reason, it is possible to reduce the amount of metal halide enclosed mainly as a buffer material for forming a lamp voltage. As a result, it is possible to avoid the adverse effects (increased color deviation and decreased luminous efficiency) that occur when a relatively excessive amount of metal halide for forming the lamp voltage is enclosed. Holmium also has properties similar to those described above for thulium.

  The buffer substance may be either mercury or a metal halide. By using the latter metal halide, a mercury-free high-pressure discharge lamp can be obtained. The metal halide of the buffer substance is preferably a halide which has a higher vapor pressure than the luminescent metal halide and hardly emits light in the visible region. For example, magnesium (Mg), iron (Fe), cobalt (Co), chromium (Cr), zinc (Zn), nickel (Ni), manganese (Mn), aluminum (Al), antimony (Sb), beryllium (Be ), Rhenium (Re), gallium (Ga), titanium (Ti), zirconium (Zr) and hafnium (Hf) can be used.

  The starting gas is preferably a rare gas such as argon (Ar) or xenon. When the starting gas is sealed at 1 atmosphere or more at room temperature (25 ° C.), the luminous flux rise characteristic of the high pressure discharge lamp is improved. However, since the starting voltage increases as the enclosed pressure increases and it becomes difficult to ensure the pressure resistance of the translucent airtight container, the pressure is preferably 16 atm or less. Moreover, if it is 5 atmospheres or less, since it becomes possible to make a starting voltage into 5 kV or less, it is suitable for an object for general illumination.

  The outer tube is a means for accommodating the arc tube inside thereof, and generally the inside thereof is hermetically sealed against the outside air. Then, the arc tube is kept warm or mechanically protected. The material of the outer tube is not particularly limited, but is preferably made of hard glass and has translucency in order to derive light emitted from the arc tube to the outside.

  Also, the shape of the outer tube is not limited, but it is allowed to have various known shapes such as a BT shape and a T shape. Further, the inside of the outer tube is in a vacuum or an inert gas atmosphere. A cap is attached to the sealed end of the outer tube, and is connected to the arc tube and an ultraviolet enhancer described later.

  The pair of connection supports have a portion for mechanically supporting the arc tube inside the outer tube, together with means for supplying electric power to the arc tube. These means may be provided separately, but it is suitable for miniaturization to have a configuration in which both are combined. In general, the connection support body is constituted by a conductive support wire. However, mechanical support is not performed, and the connection support body may be provided with a power supply lead wire acting exclusively as a supply means.

  The stem member is a member sealed at one end of the outer tube. The stem member has a function of mechanically supporting the connection support inside the outer tube and sealing the electricity introduction member of the connection support. In general, it is composed of a glass member capable of sealing the electrical introduction member of the connection support, but the stem member is not limited to this and may be a sealing material such as ceramics.

  The phosphorescent member is provided on the surface of the stem member and emits phosphorescence upon receiving light output from the arc tube or irradiation with external light. Since the stem member is a part that does not directly affect the light emission of the high-pressure discharge lamp, even if a phosphorescent member is provided, it does not affect the lamp efficiency and light distribution characteristics, and phosphorescence to the arc tube Irradiation can also be performed appropriately. In addition, the phosphorescent member can be provided before the stem member is sealed in the outer tube, and it is easy to manufacture and does not take up extra space, so that the lamp is not enlarged.

The phosphorescence emitted from the phosphorescent member is desirably light having a wavelength of 440 nm or less. The phosphorescent member receives light from an arc tube or external light, accumulates its energy, and emits phosphorescence after the arc tube is extinguished. As a phosphorescent member, “long afterglow illuminator Ultra Glow” (manufactured by Nichia, model NP-2820) or “N Luminous” (manufactured by Nemoto Special Chemical, model V-300) can be used. It is. The composition of these phosphorescent members is obtained by bonding rare earth metal to strontium aluminate or calcium aluminate. Specifically, strontium aluminate (Sr ₄ Al ₁₄ O ₂₅ ), europium (Eu), dysprosium ( Dy) or europium (Eu) or neodymium (Nd) added to calcium aluminate (CaAl ₂ O ₄ ).

  Although it is possible to improve the startability of the high-pressure discharge lamp by providing a phosphorescent member, further improvement in startability may be achieved by using an ultraviolet enhancer as necessary.

  Thus, the high-pressure discharge lamp of the present invention generates a starting high voltage and applies it to the high-pressure discharge lamp when the power of the lighting circuit for lighting the lamp is turned on. When a high starting voltage is applied to the high-pressure discharge lamp, the voltage is applied between the pair of electrodes of the arc tube, and the inside of the arc tube breaks down. At this time, light from the phosphorescent member is transmitted through the arc tube. Since the light-tight airtight container or electrode is irradiated, electrons are emitted from the inner surface or electrode of the light-tight airtight container due to the photoelectric effect, and the electrons act as initial electrons and easily break down. Discharge occurs and the high pressure discharge lamp starts and lights up.

  The lighting device of the present invention includes: a lighting device main body; and the high-pressure discharge lamp according to claim 1 disposed in the lighting device main body; and a function of generating a high voltage for starting at the time of starting to start the high-pressure discharge lamp. And a high pressure discharge lamp lighting device for lighting the lamp.

  In the present invention, the lighting device is a concept including a device using the high-pressure discharge lamp of the present invention as a light source, such as a lighting fixture, a marker lamp, an indicator lamp, a photochemical reaction device, and the like. In addition, the lighting device main body refers to all of the remainder excluding the high-pressure discharge lamp from the lighting device.

  According to the present invention, the light emitted from the phosphorescent member provided on the surface of the stem member is irradiated to the light-transmitting hermetic container or electrode of the arc tube to generate initial electrons, which can easily break down and arc. Since a discharge is generated inside the lamp, it is possible to provide a high-pressure discharge lamp and a lighting device that can improve the starting characteristics, suppress the influence on the lamp efficiency and the light distribution characteristics, can be easily manufactured, and can suppress the manufacturing cost. .

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

  1 and 2 show an embodiment for carrying out the high-pressure discharge lamp of the present invention, FIG. 1 is a front view, and FIG. 3 is an enlarged sectional view of an arc tube. The high-pressure discharge lamp of this embodiment is a metal halide lamp with a rated lamp power of 100 W that can be adapted for general lighting applications, and includes a luminous tube IT, an outer tube OT, and an ultraviolet enhancer UVE. In the figure, TW is a proximity conductor, SG is a protective glass tube, SF is an arc tube support member, G is a getter, and B is a base.

  As shown in the enlarged cross section of FIG. 3, the arc tube IT has a light-transmitting hermetic container 1, a pair of electrodes 2, 2, a pair of current introduction conductors 3, 3, a pair of sealing materials 4, 4, and an ionization. Consists of medium.

  The translucent airtight container 1 is made of translucent polycrystalline alumina ceramics as translucent ceramics. And it is provided with the surrounding part 1a and a pair of small diameter cylindrical parts 1b and 1b, and has comprised the integrally molded structure. The surrounding portion 1a has a bowl shape, and includes an intermediate cylindrical portion and a pair of hemispherical portions continuous to both ends thereof. The small-diameter cylindrical portion 1b has an elongated pipe shape, and the tip communicates with the central portion of the hemispherical portion of the surrounding portion 1a. The translucent polycrystalline alumina ceramic contains about 300 ppm of magnesium (MgO) as an additive.

  The electrode 2 is mainly composed of a doped tungsten rod-shaped body 2 a, the tip of the rod-shaped body faces the inside of the surrounding portion 1 a of the translucent ceramic hermetic vessel 1 as the main electrode portion, and the base end of the current-introducing conductor 3. The electrode mount subcoil 2b is formed by butt welding to the tip and winding a thin wire such as tungsten around the intermediate portion. Then, a capillary that is a slight gap is formed between the inner surface of the small-diameter cylindrical portion 1b and the electrode mount subcoil 2b, and is inserted into the small-diameter cylindrical portion 1b.

  The current introduction conductor 3 includes a sealing portion 3a and a halogen-resistant portion 3b connected in series. The sealing portion 3a is composed of a two-obed rod-like body, seals the translucent airtight container 1 in cooperation with a sealing material 4 to be described later, and has a base end outside the translucent airtight container 1. Is exposed. The halogen-resistant portion 3b is made of a molybdenum rod-like body, and its base end is butt welded to the tip of the sealing portion 3a and inserted into the small-diameter cylindrical portion 1b of the translucent airtight container 1. Moreover, the base end of the electrode 2 is welded to the front-end | tip part.

  The sealing material 4 is made of a frit glass, that is, a melted and solidified body of a ceramic compound, and enters the small-diameter cylindrical portion 1b, and the sealing portion 3a and the small-diameter cylinder of the current introduction conductor 3 positioned in the small-diameter cylindrical portion 1b. In addition to filling the gap between the inner surface of the shaped portion 1b and surrounding the base end portion of the halogen-resistant portion 3b so that the surface of the sealing portion 3a is not exposed in the translucent airtight container 1. .

  The ionization medium consists of a metal halide and a starting gas. The metal halide includes at least a metal halide that mainly contributes to light emission. In this embodiment, at least one halide of a rare earth metal such as thulium (Tm) and holmium (Ho) is enclosed as a metal halide mainly contributing to light emission. Further, in the present embodiment, the metal halide for forming the lamp voltage is mainly included, but mercury is not included. Therefore, in this embodiment, the high pressure discharge lamp is mercury free.

  The outer tube OT is made of hard glass. Then, members such as the arc tube IT, the ultraviolet enhancer UVE, the proximity conductor TW, the protective glass tube SG, the arc tube support member SF, and the getter G are housed in predetermined positions, and the inside is evacuated. Further, the outer tube OT is provided with a flare stem 5 as a stem member sealed to a neck portion located at the lower portion in the drawing. The flare stem 5 is provided with a pair of internal lead-in wires 6a and 6b, which are a part of a connection support S described later, protruding in an airtight manner into the outer tube OT.

  A phosphorescent member L is applied and formed on the outer surface of the flare stem 5 as the stem member. This phosphorescent member L is coated with “long afterglow phosphor Ultra Glow” (manufactured by Nichia, model NP-2820), and receives and stores the light output of the arc tube IT or external light. It emits phosphorescence. Since the flare stem 5 is a portion that does not directly affect the light emission of the high-pressure discharge lamp 11, even if the phosphorescent member L is provided, the lamp efficiency and the light distribution characteristics are not affected. Further, it is possible to appropriately perform phosphorescence irradiation from the outer surface of the flare stem 5 to the arc tube IT. Further, since the flare stem 5 can be provided with a phosphorescent member before being sealed in the outer tube, it is easy to apply and apply the phosphorescent member L, and no extra space is taken in the outer tube OT. Therefore, the lamp does not increase in size.

  The connection support S is composed of internal lead-in wires 6a and 6b, a connection conductor 7, a support frame 8, a connection piece 10, and the like. The arc tube IT is arranged at a substantially central portion of the outer tube OT along the central axis inside the outer tube OT by the connection support S. That is, the arc tube IT is supported by welding the current introduction conductor 3 below the arc tube IT and welding the current introduction conductor 3 above the arc tube IT to the connection piece 10 described later, and internally introducing it through the arc tube support member SF. It is connected to the line 6a. In addition, the arc tube IT has a lower current introduction conductor 3 welded to and supported by the connection conductor 7, and is connected to the internal introduction line 6 b via the connection conductor 7.

  In the ultraviolet enhancer UVE, the conductor 11 connected to the internal electrode 22 is welded to the current introducing conductor 3 below the arc tube IT in FIG. The conductor l2 connected to the external electrode is welded to the support frame 8 of the arc tube support member SF described later. Therefore, the ultraviolet enhancer UVE is connected in parallel to the arc tube IT.

  Thus, when a high starting voltage is applied between the internal electrode 22 and the external electrode 23 prior to the start of the high-pressure discharge lamp, a dielectric barrier discharge is first generated, and the generated long-wavelength ultraviolet light is converted into the arc tube IT. Irradiate near the electrode below. As a result, electrons are added to the polycrystalline alumina ceramics constituting the electrode and the light-transmitting hermetic container 1 by the photoelectric effect, the electrons are released from the magnesium oxide, and the initial electrons are supplied. As a result, the ionization medium in the arc tube IT is obtained. Excited and easy to start.

  One end of the proximity conductor TW is welded to the upper current introduction conductor 3 in FIG. 1 of the arc tube IT. The intermediate portion is wound around the translucent airtight container 1 in the vicinity of the boundary between the upper small-diameter cylindrical portion 1b and the surrounding portion 1a to form a ring portion r1, and further, the tube shaft is close to the outer periphery of the surrounding portion 1a. It extends downward along the direction. Further, the ring portion r2 is formed by being wound around the translucent airtight container 1 in the vicinity of the boundary portion between the lower diameter cylindrical portion 1b and the surrounding portion 1a.

  Therefore, in FIG. 1, since the potential of the upper electrode (not shown) is applied to the adjacent conductor TW through the translucent airtight container 1 in the vicinity of the lower electrode, the ring portion r2 and the lower electrode A large potential gradient is born between the two. Therefore, when a high starting voltage of 5 kV or less is applied between the pair of electrodes 2 and 2, the start of the high pressure discharge lamp is promoted.

  The protective glass tube SG is made of a quartz glass cylinder, and surrounds the arc tube IT in a separated state, thereby suppressing the scattering of fragments when the arc tube IT is ruptured. And it is supported by the arc tube support member SF as will be described later.

The arc tube support member SF includes a support frame 8, a pair of support plates 9 and 9, and a connection piece 10. The support frame 8 is formed by bending a stainless steel rod into a vertically long U-shape and is connected to the internal lead-in wire 6a. The pair of support plates 9, 9 are formed of a stainless steel plate in a substantially disk shape and are fixed to the support frame 8. In addition, a through hole is formed in the central portion of the pair of support plates 9, 9, and the arc tube IT is obtained by inserting the pair of small diameter cylindrical portions 1b, 1b of the translucent airtight container 1 into the through hole. Is placed at the tube axis position of the outer tube OT, and the arc tube IT is supported in the tube axis direction. The connection piece 10 is welded to the upper part of the support frame 8, and is connected to the upper current introduction conductor 3 in the figure of the arc tube IT. The pair of support plates 9 and 9 are fitted to the upper and lower end surfaces of the protective glass tube SG to sandwich the protective glass tube SG therebetween, and are fixed to the arc tube support member SF. Therefore, the protective glass tube SG is supported by the arc tube support member SF via the pair of support plates 9 and 9.
The getter G is a performance getter supported on the upper part in FIG. 1 of the arc tube support member SF.
The base B is a screw-type base, and is attached to the lower portion of the outer tube OT in FIG. 1 and connected to the pair of internal lead-in wires 6a and 6b.
FIG. 3 is a cross-sectional view showing a ceiling-embedded downlight as an embodiment for carrying out the lighting device of the present invention.

In the high-pressure discharge lamp 11 according to the present embodiment, when a power source of a lighting circuit for lighting it is turned on, a high voltage for starting is generated and applied to the high-pressure discharge lamp 11. The phosphorescence emitted from the phosphorescent member L is light having a wavelength of 440 nm or less, and light is emitted to the arc tube IT together with the light emission of the ultraviolet enhancer UVE. Since this emitted light is applied to the light-transmitting hermetic container 1 and the electrodes 2 and 2 of the arc tube IT, electrons are emitted from the inner surface of the light-transmitting hermetic container 1 and the electrodes 2 and 2 by the photoelectric effect. It acts as initial electrons and easily breaks down. A discharge is generated inside the arc tube IT, and the high-pressure discharge lamp 11 is easily started and lit.
In the figure, 11 is a high-pressure discharge lamp, and 12 is a lighting fixture body.

  The high-pressure discharge lamp 11 has the configuration of the high-pressure discharge lamp of the present invention shown in FIG. The luminaire main body 12 constitutes a ceiling-embedded downlight, and includes a base 12a and a reflector 12b. Since the base 12a is embedded in the ceiling, the base 12a has a ceiling contact edge 12a1 at the lower end. The reflection plate 12b is supported by the base body 12a and surrounds the light emission center of the high-pressure discharge lamp 11 so that it is located at substantially the focal point.

  A high pressure discharge lamp lighting device (not shown) for lighting the high pressure discharge lamp 11 is disposed in the lighting fixture body 12 or at a position adjacent to or spaced from the lighting fixture body 12. It can be set separately.

The front view which shows one form for implementing the high pressure discharge lamp of this invention Similarly enlarged sectional view of arc tube Sectional drawing which shows the ceiling embedded downlight as one form for implementing the illuminating device of this invention

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Translucent airtight container, 2, 2 ... A pair of electrode, 5 ... Stem member, 11 ... High pressure discharge lamp, IT ... Arc tube, OT ... Outer tube, L ... Phosphorescent member, S ... Connection support body.

Claims (2)

A translucent airtight container, a pair of electrodes disposed inside both ends of the translucent airtight container, and an arc tube provided with an ionization medium enclosed in the translucent airtight container;
An outer tube containing an arc tube inside;
A connection support provided inside the outer tube and electrically connected to the pair of electrodes of the arc tube to support the arc tube;
A stem member provided at the end of the outer tube so as to seal the connection support and lead it out of the outer tube;
A phosphorescent member provided on the surface of the stem member;
A high-pressure discharge lamp comprising: A lighting device body;
The high-pressure discharge lamp according to claim 1 disposed in the illuminating device body;
A high pressure discharge lamp lighting device having a function of generating a high voltage for starting at the time of starting and starting and lighting the high pressure discharge lamp;
An illumination device comprising:

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