JP2008210699A - High-pressure discharge lamp and luminaire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high-pressure discharge lamp which keeps the fastening structure of the inner tube which has a built-in arc tube and the outer tube which surrounds this to the mouthpiece improved, facilitates and secures the fixture of the inner tube and the outer tube to a mouthpiece and certain, and is excellent in the productivity of assembly and to provide a luminaire using the high-pressure discharge lamp. <P>SOLUTION: The high-pressure discharge lamp includes: an inner tube mounting member 32; a mouthpiece B equipped with an outer tube mounting member 33 and an electric power receiving portion 31; an inner tube IT building in an arc tube LT and fixed to a mouthpiece B by inserting a rear anchor portion in an inner tube mounting portion of the mouthpiece; and the outer tube OT surrounding the inner tube and fixed to the mouthpiece B by making the external surface of a rear anchor adhere to an outer tube mounting portion 33 of the mouthpiece B. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a high-pressure discharge lamp having an improved base and a lighting fixture using the same.

  A high-pressure discharge lamp having an outer tube that surrounds an inner tube in which an arc tube is built and a base end portion is fixed to a base is known (see Patent Document 1). In this high-pressure discharge lamp, a pinch seal portion is formed at the base end portion of the inner tube, and the arc tube is housed in an airtight manner inside the inner tube. The outer tube has a bottomed cylindrical shape, and the base end is open. In addition, an annular groove is formed on the upper surface of the base, and a cylindrical portion remaining in the central portion by the annular groove is divided into two by a linear groove formed in the diameter direction, and linear with the annular groove. The groove communicates.

  Thus, the inner tube is fixed to the base by the pinch seal portion being adhered in the linear groove by an adhesive. Further, the outer tube is fixed to the base by bonding both inner and outer surfaces of the base end portion in the annular groove with an adhesive.

  The high pressure discharge lamp has a problem that the outer tube is fogged due to evaporation of moisture released from the adhesive and adheres to the inner surface of the outer tube, which obstructs the appearance of the product. A vent hole is formed to communicate the space between and the external space of the high-pressure discharge lamp.

JP 2006-331663 A

  However, the above high-pressure discharge lamp is difficult to uniformly apply the adhesive to both the inner and outer surfaces of the outer tube, and it takes time until the moisture released from the adhesive escapes from the base to the outside. There is a problem that assembly productivity is poor because positioning is difficult.

  The present invention improves the fixing structure of the inner tube containing the arc tube and the outer tube surrounding the inner tube to the base so that the inner tube and the outer tube can be fixed to the base easily and reliably. An object is to provide an excellent high-pressure discharge lamp and a lighting apparatus using the same.

    The high-pressure discharge lamp of the present invention includes a base having an inner tube fixing portion, an outer tube fixing portion, and a power receiving portion; and is fixed to the base by inserting a light emitting tube and inserting a base end portion into the inner tube fixing portion of the base. And an outer tube that surrounds the inner tube and is fixed to the base by adhering the outer surface of the base end to the inside of the outer tube fixing portion of the base.

  The configuration of the above basic invention will be described below.

  [Regarding the Base] The base is generally defined as a lamp component that holds the main body of the high-pressure discharge lamp in the socket and performs the function of electrically connecting to the power source. If the inner tube fixing holding portion, the outer tube fixing portion and the power receiving portion are provided, the remaining structure is free. Therefore, in the present invention, the base can adopt various known structures.

  Further, the base can be preferably provided with a base body made of a heat-resistant insulator in order to dispose the inner tube fixing portion, the outer tube fixing portion and the power receiving portion at functional positions. The die base is integrally formed of ceramics such as steatite. Further, it is allowed to use a metal clip as an auxiliary member when fixing the inner tube to the inner tube fixing part.

    (Regarding the inner tube fixing portion) The inner tube fixing portion is a portion for fixing the inner tube to the base by inserting a base end portion of the inner tube to be described later. “Fixing by insertion” is an aspect in which the inner tube can be fixed to the base only by the action of inserting the inner tube without using an adhesive. As an aspect of the inner tube fixing portion that inserts the proximal end portion and fixes the inner tube, the proximal end portion may be directly fixed, or indirectly fixed through a fixing auxiliary member such as a metal clip, for example. May be. In the latter case, the fixing auxiliary member may be attached to the proximal end portion of the inner tube, or may be attached to, for example, the inner tube fixing portion.

  Moreover, in the aspect which comprises the pinch seal part so that the base end part of an inner pipe may mention later, it is convenient to use both flat surfaces of the said pinch seal part for fixation with respect to an inner pipe fixing part. For example, a pair of upstanding tongues that are opposed to each other so as to sandwich and fix both flat surfaces are projected upward from the bottom part of the base, and both standing tongues directly or both sides of the pinch seal part are formed. It can be configured to be sandwiched indirectly. Furthermore, by forming a tapered surface on the outer surface of the pair of upstanding tongue pieces that are spaced apart from each other and having a gap extending toward the base portion, and preferably forming a part of a truncated conical surface, this tapered surface is formed into the outer tube. It can be used as a guide for inserting the base end portion into the base and as a guide for centering.

  (Regarding the outer tube fixing portion) The outer tube fixing portion is a portion for fixing the outer tube to the base by bonding the outer surface of the base end portion of the outer tube, which will be described later, to the inside thereof. The outer tube fixing portion can be configured by forming an annular peripheral wall at the tip portion of the base so as to surround the concentric relationship with the inner tube fixing portion. In this aspect, the space between the inner surface of the annular peripheral wall and the outer surface of the base end portion of the outer tube is fixed with an adhesive. The adhesive may be applied to the entire circumference of the base end portion of the outer tube, or may be applied intermittently to the peripheral surface. Further, the adhesive may be applied to the outer surface of the base end portion of the outer tube, or may be applied to the inner bonding surface of the outer tube fixing portion.

  Then, since the adhesive is applied to the outer surface of the proximal end portion of the outer tube and adhered, the adhesive is not substantially exposed to the space between the inner tube and the outer tube. Water from the adhesive is not released into the space. For this reason, it is not necessary to form a communication hole for diverging the moisture released into the space to the outside, and it is not necessary to leave it until the moisture is diffused to the outside through the communication hole. .

  (Regarding Power Receiving Unit) The power receiving unit is means for receiving power supplied to the high pressure discharge lamp from the power source and supplying it to the main body of the high pressure discharge lamp, and selectively adopts the power receiving unit in various known cap forms as desired. be able to. The bases of the plug-in type, screw-in type, pinless plug-in type, bi-post type and the like mainly differ in the structure of the power receiving unit.

  Next, since a screw-type base is mainly used for the high-pressure discharge lamp, a power receiving unit in the base will be described below. In other words, the power receiving unit in the screw-type base is configured by disposing the base shell and the center contact in a predetermined position of the insulating base while maintaining an insulating relationship with each other, and a pair of external parts led out from the inner tube One of the lead wires is connected to the base shell and the other is connected to the center contact.

  (Regarding Metal Clip) The metal clip is a means for assisting the coupling between the proximal end portion of the inner tube, for example, the pinch seal portion and the inner tube fixing portion, and is adopted as desired. Then, it is attached in advance to the proximal end portion of the inner tube or attached to the inner tube fixing portion.

  Then, when the base end portion of the inner tube is inserted into the inner tube fixing portion of the base, the metal clip assists in mechanical connection between the inner tube fixing portion and the inner tube, It is effective to prevent the withdrawal from.

  [About the arc tube] In the present invention, the arc tube includes a translucent airtight container, a pair of electrodes, a pair of current introduction conductors, and a discharge medium.

  The light-transmitting hermetic container is made of a heat-resistant and porous material such as light-transmitting ceramics or quartz glass, and includes a surrounding portion and a pair of sealing bodies.

  The surrounding portion bulges and is used as a discharge space inside. Note that translucency means that it is only necessary to transmit at least a light-emitting component in a desired wavelength region to the outside from radiation generated by discharge. Moreover, the translucency should just have a grade which functions without a problem as a translucent airtight container in the normal operation state of a high pressure discharge lamp.

  The sealing body is connected to both ends of the surrounding portion, supports the electrode as will be described later, and seals the translucent airtight container. When a translucent airtight container consists of translucent ceramics, generally the sealing body is formed of the small diameter cylinder part. In the sealing body composed of the small-diameter cylindrical portion, a slight gap is formed between the electrode and / or current introduction conductor inserted through the sealing body and the inner surface of the small-diameter cylindrical portion. Therefore, by setting the length of the small-diameter cylindrical portion to an appropriate value, the liquid phase halide stays inside a small gap during lighting, and acts as a so-called capillary, so that the light-transmitting hermetic container has the maximum length. A cold part can be formed or the temperature of the sealing part can be maintained at a predetermined temperature.

  However, in the present invention, although the sealing body is provided, it is not essential that the sealing body forms a capillary.

  Next, when the light-transmitting hermetic container is formed of a light-transmitting ceramic, for example, a single crystal metal oxide such as sapphire and a polycrystalline metal oxide such as a translucent airtight aluminum oxide, yttrium- Aluminum-garnet (YAG), yttrium oxide (YOX), and polycrystalline non-oxide such as aluminum nitride (AlN) can be used.

  The inner volume of the translucent airtight container, that is, the volume of the discharge space can be set to various values according to the rated lamp power of the high pressure discharge lamp. In addition, the discharge space may have various shapes such as a cylindrical shape, a spherical shape, and an elliptical spherical shape.

    (About a pair of electrode) A pair of electrode is sealed by the translucent airtight container, and the front-end | tip is spaced apart and it faces discharge space. The electrode can be formed using a refractory metal such as tungsten (W), doped tungsten, thorium-containing tungsten, rhenium (Re), rhenium-tungsten alloy (Re-W), or molybdenum (Mo). . Further, the electrode can be formed using a part of the base end side or the like using a different kind of refractory metal or cermet. For example, the main part of the electrode is made of tungsten, and the base end part is made of molybdenum or cermet. Further, the electrode can be constituted of an elongated electrode shaft portion and an electrode main portion disposed at the tip portion of the electrode shaft portion. In this case, the electrode main portion is a portion that is disposed at the tip of the electrode shaft and mainly functions as a cathode and / or an anode, and constitutes the tip of the electrode. In addition, the electrode main part can be wound with, for example, a tungsten coil, if necessary, in order to increase its surface area and improve heat dissipation.

    (About the current introduction conductor) The current introduction conductor is a means for supplying current to the pair of electrodes, and is introduced from the sealing body into the translucent airtight container, and the tip is directly or directly on the base end of the electrode. It connects indirectly and a base end is exposed outside from a sealing body. When the light-transmitting hermetic container is made of a light-transmitting ceramic, the current-introducing conductor cooperates with, for example, a sealing body composed of a ceramic sealing compound sealing portion and a small-diameter cylindrical portion to form the light-transmitting hermetic container. Seal. As the current introduction conductor, a conductive substance having a thermal expansion coefficient close to the material of the light-transmitting hermetic container, for example, niobium (Nb), tantalum (Ta), or cermet in the case of a light-transmitting alumina ceramic is preferable. It is. In the case of quartz glass, molybdenum is preferred.

    (Discharge medium) The discharge medium is composed of at least a metal halide and a starting gas. In addition, a lamp voltage forming material can be preferably included.

  The metal halide includes at least a luminescent metal halide. As the luminescent metal halide, various known luminescent metals and metal halides of combinations thereof can be used.

  The starting gas contributes to starting discharge at least when starting the high-pressure discharge lamp. However, the specific gas type is not limited. In the case of a high-pressure discharge lamp for general illumination, a mixed gas of neon (Ne) and argon (Ar) is preferable. The sealing pressure of the starting gas is generally 8 to 80 kPa. If it is less than 8 kPa, starting becomes difficult as can be understood from the Paschen curve. Moreover, when it exceeds 80 kPa, a starting voltage will become high and will exceed the pressure | voltage resistance of a nozzle | cap | die.

  The lamp voltage forming substance is a discharge medium that mainly contributes to forming a voltage appearing between a pair of electrodes during lighting as a buffer, and mercury and / or metal halide can be used. As the metal halide as the lamp voltage forming substance, a metal halide having a relatively high vapor pressure can be used.

  [Regarding Inner Tube] The inner tube has a light-emitting tube built in, and is fixed to the base without using an adhesive by inserting the base end portion into the base. The mode in which the arc tube is built in may be either airtight or communicating with the outside. The arc tube is supported with respect to the inner tube, preferably at a position in the center of the axis, and the pair of electrodes are connected to a pair of external lead wires led out from the inner tube.

  In addition, the inner tube can accommodate a starting component, such as an ultraviolet ray source, a high voltage pulse generator, or a proximity conductor, at a predetermined position inside the arc tube as necessary to start the arc tube as required. .

  Further, the inner tube is configured such that its proximal end portion is resistant to fixing the inner tube when inserted into the base. For example, the inner tube is allowed to be configured to be fixed to the base by inserting a seal portion formed at the base end portion of the inner pipe into the base or inserting an external lead wire. The seal part of the inner tube is formed as a pinch seal part as described above, for example. By forming ridges on both side edges of the flat surface of the pinch seal part, when the base end part of the inner tube is inserted into the base, the flat part formed between the ridges is fixed. Positioning of the inner tube is easy and reliable.

  Furthermore, the material of the inner pipe is not particularly limited. However, since the heat resistance is improved by forming the inner tube from quartz glass, the size can be reduced. Further, since the inner tube is covered with the outer tube, the inner tube is not directly touched with a finger, and the inner tube is not soiled.

  Furthermore, the inside of the inner pipe is configured to be kept airtight with respect to the outside or communicated with the outside air. As a high-pressure discharge lamp for general illumination, the inside of the outer tube is generally set to a vacuum or an inert gas (for example, nitrogen or argon) atmosphere.

  [Regarding the outer tube] The outer tube houses the inner tube therein, and protects the inner tube and the arc tube from mechanical and fouling by a finger. The material of the outer tube is not particularly limited. For example, the outer tube can be formed of hard glass or semi-hard glass.

  The outer tube is separated from the inner tube, and is fixed to the outer tube fixing portion of the base using an adhesive. For this purpose, the base end of the outer tube is open, but the other shapes and structures are not limited. For example, various shapes of tubes such as T-shape, BT-shape, and R-shape can be appropriately selected and employed as desired.

  The adhesive 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 inorganic adhesive is suitable.

  According to the present invention, the outer surface of the base end portion of the outer tube is bonded to the inside of the outer tube fixing portion of the base, whereby the outer tube is fixed to the base, and the base end portion of the inner tube is the inner tube fixing portion of the base. Since the inner tube is fixed to the base by being inserted into the adhesive, the adhesive is not substantially exposed in the space formed between the outer tube and the inner tube, and the moisture contained in the adhesive Is not discharged into the space, and not only does the outer surface of the outer tube become cloudy and the appearance of the high-pressure discharge lamp is not disturbed, but also a high-pressure discharge lamp with good assembly productivity and the same A luminaire can be provided.

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

    1 to 6 show a first embodiment for implementing a high-pressure discharge lamp according to the present invention, FIG. 1 is a front view of the high-pressure discharge lamp, FIG. 2 is a front view of an inner tube having a built-in arc tube, FIG. 3 is an enlarged cross-sectional view of the arc tube, FIG. 4A is a schematic front cross-sectional view of the high-pressure discharge lamp, FIG. 4B is an enlarged front cross-sectional view of the base portion, FIG. (A) of the base is a front sectional view, (b) is a plan view, and (c) is a side sectional view.

  The high-pressure discharge lamp of this embodiment has a structure suitable for a rated lamp power of 70 W, and includes an outer tube OT, an inner tube IT, an arc tube LT, and a base B as shown in an exploded view in FIG. ing.

  The outer tube OT is a T-shaped bulb having a bottomed cylindrical shape made of hard glass in this embodiment. Therefore, in this embodiment, the base end portion of the outer tube OT is configured by the opening edge portion. If a cap-shaped glare cut film is formed by applying a light-shielding substance to the outer surface of the head portion of the outer tube OT, it is not necessary to provide a separate light-shielding cap in the lighting fixture. For this reason, the structure of the luminaire is simplified and the cost is reduced accordingly, and the attachment / detachment operation of the high-pressure discharge lamp is facilitated.

  The inner tube IT is made of quartz glass in this embodiment, and an exhaust tip-off portion 11 is formed at the center of the closed tip portion. A pinch seal portion 12 is formed at the base end portion. A pair of sealing metal foils 12a and 12a are both hermetically embedded in the pinch seal portion 12, and the internal lead wires 12b and 12c and the external lead wires 12d and 12d are connected to both ends of the sealing metal foil 12a. Yes. A pair of protrusions 12e and 12e are formed on the side edge portions of both flat surfaces of the pinch seal portion 12, and a flat surface 12f that is one step lower is formed between them.

  Therefore, in this embodiment, the proximal end portion of the inner pipe IT is configured by the pinch seal portion 12. In the present embodiment, in the inner tube IT, in addition to the arc tube LT, incidental components such as an ultraviolet ray generation source UVE, a support member SF, and a getter G are disposed as described later. However, in FIG. 4 and FIG. 5, these incidental components are not shown.

  As shown in FIG. 3, the arc tube LT includes a translucent airtight container 1, a pair of electrodes 2, 2, a pair of current introduction conductors 3, 3, a pair of seal portions 4, 4, and a translucent ceramics airtight container 1. A discharge medium sealed inside.

  The translucent airtight container 1 is made of translucent polycrystalline alumina ceramics in this embodiment, and is a small-diameter cylinder as a pair of sealing bodies 1b1 and 1b2 disposed in communication with both ends of the enclosing part 1a and the enclosing part 1a. The discharge space 1c is formed inside. The surrounding part 1a and the sealing bodies 1b1, 1b2 are integrated by casting.

  The pair of electrodes 2 and 2 is made of a tungsten rod, and is inserted into the sealing bodies 1b1 and 1b2. A slight gap called a capillary is formed between the shaft portion of the electrode 2 and the inner surfaces of the small diameter cylindrical portions of the sealing bodies 1b1 and 1b2. The tip of the electrode 2 protrudes into the surrounding part 1a.

  As shown in FIG. 2, the pair of current introduction conductors 3 and 3 are each composed of a single body such as niobium or cermet or a composite body in which both members are joined in the longitudinal direction. And the front-end | tip is inserted in sealing body 1b1, 1b2, is connected to the base end of the electrode 2, supports the electrode 2, and the base end protrudes outside from the sealing body 1b1, 1b2. In FIG. 1 derived from the sealing body 1b2, the base end of the current-introducing conductor 3 on the upper side is inserted into the exhaust tip-off portion 11 of the outer tube OT so that a part of the support member SF described later is provided. It also contributes to the centering of the arc tube IT.

  The pair of seal portions 4 and 4 is formed by heating and melting a ceramic sealing compound and then solidifying the compound. Thus, the pair of seal portions 4, 4 includes portions on the end face side of the sealing bodies 1 b 1, 1 b 2 of the translucent discharge vessel 1, and the niobium rod-like bodies Nb of the current introduction conductors 3, 3 facing them, The light-transmitting hermetic container 1 is hermetically sealed with a pair of lead conductors 3 and 3 in the sealing bodies 1b1 and 1b2 so that the pair of introduction conductors 3 and 3 are not exposed to the inside of the light-transmitting hermetic container 1. The entire portion inserted into the cover is covered.

  The discharge medium is made of a metal halide, a starting gas, and mercury, and is enclosed in the translucent airtight container 1. Note that the metal halide and mercury are encapsulated in excess of the amount that evaporates. A part of the metal halide stays in a liquid state in a slight gap formed in the sealing bodies 1b and 1b during stable lighting. And the coldest part is formed in the surface layer part vicinity of the discharge medium which has stayed in the sealing body 1b1 used as the lower side during lighting, for example in the liquid phase state.

  The metal halide is made of a luminescent metal halide, and can be composed of a metal halide selected from the group of thulium (Tm), sodium (Na), thallium (Tl), and rare earth metals, for example.

  As shown in FIG. 1, the support member SF is formed by integrally extending an internal lead wire 12b. Then, the position close to the inner wall of the outer tube OT extends along the tube axis direction, the tip is bent near the tip of the outer tube OT, and is welded to the upper current introducing conductor 3 in FIG. As a result, the arc tube IT is supported.

  As shown in FIG. 1, the ultraviolet ray source UVE includes a small container 21, an introduction wire 22, an internal electrode 23, a discharge gas, and an external electrode 24. The small container 21 has a bottomed cylindrical capsule shape made of ultraviolet transmissive quartz glass, and an elongated discharge space is formed inside. The lead-in wire 22 is made of molybdenum, and the tip is welded to the internal electrode 23. The internal electrode 23 is made of a strip-shaped molybdenum foil and is sealed in the discharge space of the small vessel 21. The discharge gas is made of argon, for example, and is enclosed in the small container 21. The external electrode 24 is made of a molybdenum wire, and its tip end is tightly wound around the outer periphery of the small container 21 and is wound several turns. The intermediate portion extends substantially linearly and is placed inside one small-diameter cylindrical portion 1b1. It approaches so that it may contact substantially the outer surface of the position which opposes the site | part in which slight space is formed, and the base end part is welded to support member SF.

  Further, the ultraviolet ray generation source UVE is located at a position facing the support member SF, and a main portion thereof is disposed between the inner surface of the inner tube IT and one small-diameter cylindrical portion 1b1 of the arc tube LT. As a result, the sealing body 1b1 and the ultraviolet ray generation source UVE are arranged substantially in parallel with each other along the tube axis direction.

  As shown in FIG. 1, the getter G is welded to the support member SF, and cleans the inside of the inner pipe IT.

  As shown in FIGS. 4 to 6, the base B includes a base body 30, a power reception unit 31, and a metal clip MC.

  The base body 30 is made of a steatite molded body, and integrally includes an inner tube fixing holding portion 32, an outer tube fixing portion 33, and a power receiving portion insulator 34.

  The inner tube fixing / holding portion 32 is composed of a pair of standing tongue pieces 32 a and 32 a that protrude from the upper surface of the base body 30 with the center therebetween. 1 and FIG. 2 formed in the middle part of the pair of front and back flat surfaces in the pinch seal portion 12 of the inner pipe IT in the gap between the flat inner surfaces facing each other of the pair of standing tongue pieces 32a and 32a. By inserting the flat portion 12f, the inner tube IT is fixed to the base B with the help of a metal clip MC described later. And in this form, a pair of protruding item | line 12e, 12e formed in the both-sides edge of the flat surface of the pinch seal part 12 is exposed outside from the both sides of the standing tongue piece 32a, and centers the inner pipe IT.

  The outer tube fixing portion 33 is configured by an annular peripheral wall formed so as to concentrically surround the pair of standing tongue pieces 32a and 32a. A slight gap is formed inside the annular peripheral wall, and the base end portion of the outer tube OT is inserted. Further, the back surfaces of the pair of standing tongues 32a, 32a of the inner tube fixing portion 31 constitute a part of a truncated cone shape, and a tapered shape is formed between the truncated cone shape portion and the annular peripheral wall. Grooves are formed. Therefore, the back surfaces of the pair of standing tongue pieces 32a and 32a perform a guide operation and a centering operation when the proximal end portion of the outer tube OT is inserted into the annular peripheral wall.

  The outer surface of the base end portion of the outer tube OT and the inner surface of the annular peripheral wall of the outer tube fixing portion 33 are bonded by an adhesive CB. In this embodiment, the adhesive CB is applied to the outer surface of the base end portion in advance prior to fixing the base end portion of the outer tube OT to the outer tube fixing portion 33. The adhesive CB is not applied to the inner surface side of the outer tube OT. When the outer tube OT is attached to the outer tube fixing portion 33, the adhesive CB may slightly protrude inside the outer tube OT and invade the inner tube OT. However, the outer tube OT is free from defects such as cloudiness. If so, no problem. If the adhesive used is 0.45 to 1.75 g, sufficient adhesion strength is obtained and the adhesive does not substantially enter the outer tube OT. Further, according to this embodiment, it was proved that the adhesion strength between the outer tube OT and the base B can be 10 Nm or more.

  The power receiving portion insulator 34 is formed to project downward from the inner tube fixing portion 32 and the outer tube fixing portion 33 of the base body 30 in FIG. A central hole 34 a that communicates with the bottom of the inner tube fixing portion 32 is formed at the center.

  The power receiving unit 31 includes a base shell 31 a and a center contact 31 b each having a thread groove formed on the outer periphery made of a conductive metal, and is disposed on the outer surface of the power receiving unit insulator 34 of the base base 30.

  The base shell 31 a is fitted to the outside of the power receiving portion insulator 34 formed in the lower portion of the base base 30 in FIG. 4, and the opening edge thereof is crimped with a punch, and a part of the opening edge is made into the power receiving portion insulator 34. The power receiving unit insulator 34 is attached by being pushed into the pair of formed recesses 34b and 34b. A through hole 34c communicating with the bottom of the outer tube fixing portion 32 is formed in the power receiving portion insulator 34 of the base body 30, and one of the external lead wires 12b of the inner tube IT led out from the through hole 34c is welded or formed. It is connected to the base shell 34a by crimping. As shown in FIG. 6, a pair of through holes 34c are formed at point-symmetric positions of the center hole 34a. However, for the convenience of automatic assembly by an assembly machine, one may be used.

  The center contact 33 b is disposed at the center front end of the power reception unit insulator 33. The other of the external lead wires 12b of the inner pipe IT inserted into the center hole 34a of the power receiving portion insulator 34 is connected by, for example, brazing.

  As shown in FIG. 5, the metal clip MC is configured by bending one ribbon-shaped metal spring material into a deformed U-shape. The width of the bottom portion of the U-shape is substantially the thickness of the pinch seal portion 12, and the abutting portion 35 a against the inner surface of the standing tongue piece 32 a of the inner tube fixing portion 32 and the pinch seal portion 12 are intermediate between both legs. A contact portion 35b to the outer surface is formed. Further, a locking portion 35c to the inner surface of the standing tongue piece 32a is formed at the tip of both leg portions. In FIG. 5, the magnifications of the outer tube OT, the inner tube IT, the base B, and the metal clip MC are changed so that the structure can be easily understood.

  Then, the metal clip MC is inserted into the inner tube fixing portion 32 together with the inner tube IT after being attached to the pinch seal portion 12 in advance. When the metal clip MC is inserted, the abutting portion 35a elastically contacts the inner surface of the upright tongue piece 32a, and the locking portion 35c elastically contacts the outer surface of the pinch seal portion 12 so that the inner tube IT is fixed to the base B. In addition, the locking portion 35c is further locked in the retaining direction on the inner surface of the standing tongue piece 32a.

    FIG. 7 is a front view showing a second embodiment for carrying out the high-pressure discharge lamp of the present invention. In the figure, the same parts as those in FIG. This embodiment is different from the first embodiment in that a glare cut film GC (shaded portion) is provided on the head of the outer tube OT.

  The glare cut film GC is formed by applying a paste of Fe—Cu—Zn alloy powder to the outer surface of the outer tube OT head above the getter G and drying it, and has a film thickness of about 180 μm. .

    FIG. 8: is a principal part cross-sectional front view which shows one form for implementing the lighting fixture of this invention.

  In this embodiment, the lighting fixture is a concept that includes a lighting fixture main body 40, a high-pressure discharge lamp HDL, and a lighting device, and includes various indoor and outdoor lighting fixtures. Further, the lighting fixture may be for general lighting or special lighting. Note that the special illumination includes various uses other than the general illumination.

  The luminaire main body 40 is made up of the remaining part excluding the high-pressure discharge lamp HDL and the lighting device from the luminaire. In this embodiment, the luminaire is a spotlight for indoor lighting, and the luminaire main body 40 is mainly composed of a mounting base 41, a column 42, a base body 43, a socket 44, a reflector 45, a light shielding cap 46, and a full glass 47. Configured as an element. The base body 43 can be rotated in a horizontal plane and a vertical plane with respect to the support column 42.

  The high-pressure discharge lamp HDL is the high-pressure discharge lamp of the present invention shown in FIGS. In addition, when using the high pressure discharge lamp of the form shown in FIG. 7, the light shielding cap 46 is unnecessary.

  The lighting device is disposed separately from the luminaire main body 40, for example, on the back of the ceiling. The circuit means for lighting the high-pressure discharge lamp HDL may be any of electronic means and those mainly composed of a core and a winding.

The front view which shows the 1st form for implementing the high pressure discharge lamp of this invention Front view of the inner tube with a built-in arc tube Similarly enlarged sectional view of arc tube Similarly, (a) is a schematic front sectional view of a high-pressure discharge lamp, and (b) is an enlarged front sectional view of a base part. Similarly, exploded cross-sectional and front schematic views of each part Similarly, (a) of the base is a front sectional view, (b) is a plan view, and (c) is a side sectional view. The front view which shows the 2nd form for implementing the high pressure discharge lamp of this invention The principal part cross-sectional front view which shows one form for implementing the lighting fixture of this invention

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Translucent ceramic discharge vessel, 3 ... Current introduction conductor, LT ... Light emission tube, 11 ... Exhaust tip-off part, 12 ... Pinch seal part, 31 ... Power receiving part, 31a ... Base shell, 31b ... Center contact, 32 ... Inner tube fixing portion, 32a ... Standing tongue piece, 33 ... Outer tube fixing portion, 34 ... Power receiving portion insulator, 34a ... Center hole, 34b ... Recess, 34c ... Through hole, MC ... Metal clip, 30 ... Base body, IT ... inner tube, LT ... arc tube, OT ... outer tube

Claims (6)

A base having an inner tube fixing portion, an outer tube fixing portion and a power receiving portion;
An inner tube fixed to the base by inserting the arc tube and inserting the base end into the inner tube fixing part of the base;
An outer tube that surrounds the inner tube and is fixed to the base by bonding the outer surface of the base end to the inside of the outer tube fixing part of the base;
A high-pressure discharge lamp comprising:   2. The high-pressure discharge lamp according to claim 1, wherein the inner tube is fixed to the base by means of a metal clip when inserted into the inner tube fixing portion of the base. The base has an outer tube fixing portion constituted by an annular peripheral wall formed at the tip of the base;
The outer tube has a proximal end inserted into the annular peripheral wall and bonded between the outer surface of the proximal end and the inner surface of the annular peripheral wall;
The high-pressure discharge lamp according to claim 1 or 2.   The high pressure discharge lamp according to any one of claims 1 to 3, wherein the adhesive is not substantially exposed in a space between the inner tube and the outer tube. The inner tube has a pinch seal at its proximal end;
The base is configured by a pair of spaced-apart raised tongues that sandwich the pinch seal portion of the inner tube with the inner tube fixing portion, and the outer tube fixing portion is disposed so as to concentrically surround the inner tube fixing portion. Constituted by an annular peripheral wall;
The outer tube is bonded by inserting its proximal end into the annular peripheral wall of the base;
The high-pressure discharge lamp according to any one of claims 1 to 4, wherein A lighting fixture body;
A high-pressure discharge lamp according to any one of claims 1 to 5 mounted on a lighting fixture body;
A lighting device for lighting the high-pressure discharge lamp;
The lighting fixture characterized by comprising.

Images