EP1041603A1 - Lampe a decharge haute tension et dispositif d'eclairage - Google Patents

Lampe a decharge haute tension et dispositif d'eclairage Download PDF

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Publication number
EP1041603A1
EP1041603A1 EP99929830A EP99929830A EP1041603A1 EP 1041603 A1 EP1041603 A1 EP 1041603A1 EP 99929830 A EP99929830 A EP 99929830A EP 99929830 A EP99929830 A EP 99929830A EP 1041603 A1 EP1041603 A1 EP 1041603A1
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EP
European Patent Office
Prior art keywords
light
discharge vessel
small
transmitting ceramic
diameter cylindrical
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP99929830A
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German (de)
English (en)
Other versions
EP1041603A4 (fr
Inventor
Hisashi Honda
Seiji Ashida
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Lighting and Technology Corp
Original Assignee
Toshiba Lighting and Technology Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toshiba Lighting and Technology Corp filed Critical Toshiba Lighting and Technology Corp
Publication of EP1041603A1 publication Critical patent/EP1041603A1/fr
Publication of EP1041603A4 publication Critical patent/EP1041603A4/fr
Withdrawn legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/82—Lamps with high-pressure unconstricted discharge having a cold pressure > 400 Torr
    • H01J61/827—Metal halide arc lamps
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/36—Seals between parts of vessels; Seals for leading-in conductors; Leading-in conductors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/04—Electrodes; Screens; Shields
    • H01J61/06—Main electrodes
    • H01J61/073—Main electrodes for high-pressure discharge lamps
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/30—Vessels; Containers

Definitions

  • the present invention relates to a high-pressure discharge lamp that has a discharge vessel made of light-transmitting ceramic, and a lighting apparatus that uses the lamp.
  • the present inventors have already invented a high-pressure discharge lamp comprising light-transmitting ceramic that has a desirable long lifetime and a preferable light-emission efficiency even with a small size. That invention has already been filed as Japanese Patent Application No. 10-196322.
  • the invention according to this application discloses a light-transmitting ceramic discharge vessel comprising a bulging section having both ends narrowed by continuous curved surfaces, and small-diameter cylindrical sections communicating with the ends of the bulging section and having an inner diameter smaller than the bulging section. It is very advantageous for a small high-pressure discharge lamp to use this discharge vessel because the discharge vessel can be formed integral with ease and has no optically and thermally discontinuous portion.
  • the electric discharging power attenuates so operation errors are caused at starting or transition from a glow discharge to an arc discharge becomes difficult.
  • sputtering is excited and blackening occurs in the light-transmitting ceramic discharge vessel due to the sputtering.
  • the first object of the present invention is to provide a small, high-pressure discharge lamp which starts steadily.
  • the second object of the present invention is to provide a small, high-pressure discharge lamp which easily transits from glow discharge to arc discharge.
  • the third object of the present invention is to provide a small, high-pressure discharge lamp in which the light-transmitting ceramic discharge vessel is prevented from blackening due to sputtering.
  • the forth object of the present invention is to provide a lighting apparatus using the above described small, high-pressure discharge lamp.
  • the first high-pressure discharge lamp is characterized by comprising: a light-transmitting ceramic discharge vessel having an internal volume of 0.1 cc or less and including a bulging section and small-diameter cylindrical sections communicating with both ends of the bulging section, the bulging section having both ends narrowed by a continuous curved surface, and the small-diameter cylindrical sections having an inner diameter smaller than the bulging section; power-supplying conductors each including a seal part and a halide-resistant section having a proximal end connected to a distal end of the seal part and inserted respectively in the small-diameter cylindrical sections of the light-transmitting ceramic discharge vessel, each of the halide-resistant sections forming a slight gap to the inner surface of the small-diameter cylindrical section; a pair of electrodes respectively arranged at the distal ends of one halide-resistant parts and located in the bulging section of the light-transmitting ceramic discharge vessel, with a distance d1 of 1.0 mm or above maintained
  • Light-transmitting ceramic discharge vessel means a discharge vessel made of light-transmitting and heat-resistant materials. Among these materials are: a single-crystal metallic oxide such as sapphire; a polycrystalline metallic oxide such as translucent, airtight aluminum oxide, yttrium-aluminum garnet (YAG) or yttrium oxide; and a polycrystalline non-oxide such as aluminum nitride (AIN).
  • a single-crystal metallic oxide such as sapphire
  • a polycrystalline metallic oxide such as translucent, airtight aluminum oxide, yttrium-aluminum garnet (YAG) or yttrium oxide
  • AIN aluminum nitride
  • the term “light-transmitting” is used in the sense that the light generated by discharge may be guided to the outside, passing through the discharge vessel. It may mean either transparency or light-diffusing property.
  • the bulging section, or center section, and the small-diameter cylindrical sections connected to the ends of the bulging section is preferably formed integral first.
  • the light-transmitting ceramic discharge vessel can be also formed in a manner that the bulging section is molded preliminarily with the both ends narrowed by a continuous curved surface integrally, and then a pair of small-diameter cylindrical sections preliminarily molded are fitted in the distal ends of the bulging section respectively and sintered.
  • the internal volume of the light-transmitting ceramic discharge vessel is defined to 0.1 cc or less because the present invention relates to the small, high-pressure discharge vessel.
  • the internal volume of the light-transmitting ceramic discharge vessel is measured in the following manner: the discharge vessel is put in water to fill the inside with water; opening ends of the small-diameter cylindrical section provided at the both ends of the discharge vessel are closed; the discharge vessel is taken out of water; and then water contained in the discharge vessel is measured.
  • the Power-Supplying conductor is provided to at least one of the small-diameter cylindrical section of the light-transmitting ceramic discharge vessel.
  • Power-Supplying conductors serve to supply power from a power supply through a ballast means, thus applying a voltage between the electrodes to start the high-pressure discharge lamp, and supplying a current to light the high-pressure discharge lamp. They are sealed airtightly to the small-diameter cylindrical sections by the means that will be described later.
  • the power-supplying conductors each have a seal part and a halide-resistant part.
  • “Seal part” is made of such material that the junction between it and the small-diameter cylindrical section may be sealed by the seal made of ceramic-sealing compound, which will be described later. "Seal part” is sealed to the junction between the small-diameter cylindrical section and the seal part of the power-supplying conductor through a ceramic tube.
  • the seal part of the power-supplying conductor can be made of niobium, tantalum, titanium, zirconium, hafnium, or vanadium. As a characteristic of the seal part, it does not matter whether the seal part allows passage of hydrogen and oxygen or not. These materials, however, exhibit permeability to hydrogen and oxygen.
  • the seal part be made of niobium or tantalum, because niobium and tantalum have average thermal expansion coefficients, which are almost equal to those of aluminum oxide. Niobium and tantalum have average thermal expansion coefficients, which differ only a little from those of yttrium oxide and YAG. If aluminum nitride is used as the material of the light-transmitting ceramic discharge vessel, the seal part should better be made of zirconium.
  • Halide-resistant part is made of material that is hardly corroded or is not corroded at all by the halide and liberated halogen present in the light-transmitting ceramic discharge vessel, while the high-pressure discharge lamp is operating.
  • the halide-resistant part is made of, for example, tungsten or molybdenum. In the case that the distal of the halide-resistant part extends into the light-transmitting ceramic discharge vessel and forms an electrode part, tungsten which excels in heat resistance is most preferred for the halide-resistant part.
  • the high-pressure discharge lamp according to the present invention can be either an AC-driven lamp or a DC-driven lamp. In the case of an DC-driven, high-pressure discharge lamp, anodes which are formed separately may be connected to the tips of the halide-resistant part of the power-supplying conductor.
  • a narrow gap is provided between the halide-resistant part and the inner surface of the small-diameter cylindrical section. While the lamp is being lighted, the residual halide in the form of liquid flows into this gap, forming the coldest part.
  • the gap may be adjusted appropriately, thereby to set the coldest part can be set at a desired temperature.
  • the narrow gap formed between the halide-resistant part and the inner surface of the small-diameter cylindrical section can be provided in each side of both the power-supplying conductors. It suffices that the narrow gap should be provided in at least one side of the power-supplying conductors.
  • the electrodes are provided respectively at the distal ends of the halide-resistant parts of the power-supplying conductors.
  • the distance d1 between the distal end of the electrode and the inner surface of the bulging section of the light-transmitting ceramic discharge vessel in the plane perpendicular to the axis of the electrode including its distal end is defined to 1.0 mm or more. Since the electrode may be more or less inclined to the axis of the light-transmitting ceramic discharge vessel in some cases, the average distance around the circumference about the axis of the electrode is taken as the distance.
  • the distance d1 can be securely maintained around the electrode by one or both of a measure in which the length of the projection of the electrode projected into the bulging section of the discharge vessel is increased and a method in which a portion of the light-transmitting ceramic discharge vessel facing the electrode is enlarged.
  • the distal end of the halide-resistant part of the power-supplying conductor is projected to the inside of the bulging section of the light-transmitting ceramic discharge vessel, so that the electrodes can be formed integral with the power-supplying conductor.
  • the halide-resistant part of the power-supplying conductor can be formed of a tungsten bar.
  • the power-supplying conductor and the electrode are formed individually and the electrode is connected to the distal end of the halide-resistant part of the power-supplying conductor.
  • the seal made of ceramic-sealing compound is applied to the end of each small-diameter cylindrical section, between the seal part and the small-diameter cylindrical section. While the small-diameter cylindrical section is melted by heat, ceramic-sealing compound is flowed into the gap between the seal part and the small-diameter cylindrical section, and seals the seal part and the section in airtight fashion.
  • the seal secures the power-supplying conductor at a predetermined position.
  • the seal part inserted in the small-diameter cylindrical section should be completely covered with the above-mentioned ceramic-sealing compound.
  • the proximal portion of the halide-resistant part, which is connected to the seal part may also be covered with the seal over a short distance. If so, the seal part will hardly be corroded by halide.
  • the discharge medium contains a metallic halide.
  • the metal includes at least a light-emitting metal.
  • the halogen forming the metallic halide can be one or more selected from the group consisting of iodine, bromine, chlorine and fluorine.
  • the halide of light-emitting metal can be selected from the known metallic halides in accordance with the size and input power of the light-transmitting ceramic discharge vessel, so as to acquire desired luminescent characteristics, such as luminous color, general color rendering index Ra, luminous efficiency, and the like.
  • the halide may be one or more selected from the group of halides of, for example, sodium Na, lithium Li, scandium Sc, and rare-earth metal.
  • Mercury can be contained, as a buffer medium, in an appropriate amount.
  • a halide of metal such as aluminum, which has a relatively high vapor pressure and which emits a small amount of light in the visible-light region or does not emit light at all, may be contained in the vessel.
  • Argon, xenon, neon, and the like can be used as rare gas.
  • rated electric power consumption of 35W or less is preferred for the high-pressure discharge lamp according to the present invention. In order to further downsize the high-pressure discharge lamp, rated electric power consumption of 20W or less is preferable.
  • a sufficient space can be maintained around the distal ends of the electrodes by using the above described structure.
  • a turbulent flow can be prevented from occurring around the electrodes. Even if the turbulent flow is generated, it can be suppressed to a very low degree. Therefore, the fillings can not easily adhere to the distal ends of the electrodes, so lowering of the electric discharging performance of the electrodes is prevented. As a result, deterioration of starting characteristic caused by the lowering of the electric discharging performance of the electrodes can be prevented.
  • the second high-pressure discharge lamp of the present invention which depends on the first high-pressure discharge lamp is characterized in that: the distance d1 between each of distal ends of the electrodes and the inner surface of the light-transmitting ceramic discharge vessel on a plane perpendicular to an axis of the light-transmitting ceramic discharge vessel including the distal ends of the electrodes is 1.2 mm or more.
  • the second high-pressure discharge lamp has more appropriate efficiency than the first high-pressure discharge lamp.
  • the third high-pressure discharge lamp according to the present invention is characterized by comprising: a light-transmitting ceramic discharge vessel having an internal volume of 0.1 cc or less and including a bulging section and small-diameter cylindrical sections communicating with both ends of the bulging section, the bulging section having both ends narrowed by a continuous curved surface, and the small-diameter cylindrical sections having an inner diameter smaller than the bulging section; power-supplying conductors each including a seal part and a halide-resistant section having a proximal end connected to a distal end of the seal part and inserted respectively in the small-diameter cylindrical sections of the light-transmitting ceramic discharge vessel, each of the halide-resistant sections forming a slight gap to the inner surface of the small-diameter cylindrical section; a pair of electrodes respectively arranged at the distal ends of one halide-resistant parts and having distal ends projected by 1.2 mm or more into the bulging section of the light-transmitting ceramic discharge vessel; seals
  • the length of the projection of the electrode projected into the bulging section is defined as follows.
  • the length of the bulging section is the distance between cross-points where the axis of the light-transmitting ceramic discharge vessel crosses lines which are tangent to inner surfaces of the small-diameter cylindrical sections in both end sides and are extended from the center of the inner surface of the bulging section. Therefore, the length of the small-diameter cylindrical section is given by measuring the size from the center of the bulging section to an end surface of a small-diameter cylindrical section and further subtracting the half of the length of the bulging section from the size.
  • the projecting length of the distal end of the electrode is equal to the distance from the end of the bulging section to the distal end of the electrode.
  • a turbulent flow around the electrodes can be suppressed when the lamp is turned off. That is, by defining the projecting length as described above, a sufficient space is maintained around the electrodes so that the turbulent flow can not be generated when turning off the lamp or can be suppressed to a very low degree even if a turbulent flow is generated.
  • the fillings hardly adheres to the electrodes and thus the starting characteristic can be improved.
  • the fourth high-pressure discharge lamp is characterized by comprising: a light-transmitting ceramic discharge vessel having an internal volume of 0.1 cc or less and including a bulging section and small-diameter cylindrical sections communicating with both ends of the bulging section, the bulging section having both ends narrowed by a continuous curved surface, and the small-diameter cylindrical sections having an inner diameter smaller than the bulging section; power-supplying conductors each including a seal part and a halide-resistant section having a proximal end connected to a distal end of the seal part and inserted respectively in the small-diameter cylindrical sections of the light-transmitting ceramic discharge vessel, each of the halide-resistant sections forming a slight gap to the inner surface of the small-diameter cylindrical section; a pair of electrodes respectively arranged at the distal ends of one halide-resistant parts and having distal ends projected by 1.2 mm or more into the bulging section of the light-transmitting ceramic discharge vessel, with a
  • This invention defines the length of the projection of the distal end of the electrode projected into the bulging section and the distance between the distal end of the electrode and the inner surface of the discharge vessel in the plane perpendicular to the axis of the light-transmitting ceramic discharge vessel, as above described, thereby to maintain a space around the electrodes.
  • the fifth high-pressure discharge lamp of the present invention is characterized in that the light-transmitting ceramic discharge vessel has an inner volume of 0.05 cc or less.
  • the present invention provides a more remarkable effect in case of a small, high-pressure discharge lamp in which the light-transmitting ceramic discharge vessel has an inner volume of 0.05 or less.
  • the inner volume can be reduced to less than 0.04 cc.
  • the rated lamp power of the high-pressure discharge lamp is set to of 20W or less.
  • a lighting apparatus is characterized by comprising: a main body; and any one of the first to fifth high-pressure discharge lamps, supported by the main body.
  • the lighting apparatus conceptually covers all apparatuses that apply light emission of a high-pressure discharge lamp for any purposes.
  • the present invention is applicable to lighting apparatuses, headlights for mobiles, light sources for optical fibers, image projection apparatuses, photochemical apparatuses, fingerprint identification apparatuses, and the like.
  • the main body means the other part of the lighting apparatus than the high-pressure discharge lamp.
  • bulb type high-pressure discharge lamp means a lighting device which integrally comprises a high-pressure discharge lamp, a discharge lamp lighting device, and a power-receiver means such as a base and which can be turned on by merely setting it in a lamp socket for an incandescent lamp, like a bulb-type fluorescent lamp.
  • a reflector should preferably be comprised integrally when forming a bulb-type discharge lamp.
  • FIGS. 1 and 2 A first embodiment of the high-pressure discharge lamp according to the present invention will be explained with reference to FIGS. 1 and 2.
  • the reference numeral 1 denotes a light-transmitting ceramic discharge vessel.
  • the reference numeral 2 denotes power-supplying conductors.
  • the reference numeral 3 denotes electrodes.
  • the reference numeral 4 denotes seals.
  • the light-transmitting ceramic discharge vessel includes a bulging section 1a and small-diameter cylindrical sections. The both ends of the bulging section 1a are narrowed by continuous curved surfaces and the bulging section 1a is formed into a hollow and substantially elliptic spherical shape.
  • the small-diameter cylindrical section 1b is connected to the bulging section through the continuous curved surface, and forms the light-transmitting ceramic discharge vessel 2 by integral molding.
  • the length rL of the bulging section 1a is the distance between cross-points P1 and P2 where lines s1 and s2 are respectively drawn in the lateral directions from the center of the inner surface of the bulging section 1a to be tangent to the inner surface of the bulging section 1a in the small-diameter sides.
  • the length of the small-diameter section 1b in the left side in the figure is defined as the distance lT1 between the end portion of the length rL of the bulging section 1a which is the cross-point P1 and the left end surface of the small-diameter cylindrical section (omitted from FIG. 2).
  • the length of the small-diameter cylindrical section in the right side in the figure is defined as the distance lT2 between the cross-point P2 and the right end surface of the small-diameter cylindrical section.
  • the power-supplying conductor 2 includes a seal part 2a and a halide-resistant part 2b.
  • the seal part 2a functions when sealing the light-transmitting ceramic discharge vessel 1 between the power-supplying conductor 2 and the small-diameter cylindrical section 1b.
  • the halide-resistant part 2b has a proximal end welded to the tip of the seal part 2a and a distal end projected into the bulging section 1a. Further, a small gap is formed between the part 2b and the inner surface of the small-diameter cylindrical section as shown in FIG. 2.
  • the electrode 3 is connected to the halide-resistant part 2b and is constructed to be integral with the power-supplying conductor 2.
  • d1 is the distance between the distal end of the electrode 3 and the inner surface of the light-transmitting ceramic discharge vessel 1 on a plane perpendicular to the axis c of the light-transmitting ceramic discharge vessel 1 including the distal end, this d1 is set to 1.0 mm or above.
  • the projection length d2 by which the electrode 3 projects from the bulging section 1a of the light-transmitting ceramic discharge vessel 1 is set to 1.2 mm or above.
  • a seal 4 is inserted between the small-diameter cylindrical section 1b and the seal part 2a to seal airtightly the light-transmitting ceramic discharge vessel 1 and fixes the power-supplying conductor 2 to a predetermined position.
  • a ceramic-sealing compound is applied around the seal part 2a of the power-supplying conductor 2 and is heated and melted to enter into the narrow gap between the seal part 2a and the inner surface of the small-diameter cylindrical section 1b. Further, the whole of the seal part 2a inserted in the small-diameter cylindrical section 1b is covered with the ceramic-sealing compound, and the proximal end of the halide-resistant section 2b is further covered as well.
  • a discharge medium containing a metallic halide of light-emitting metal and a rare gas is filled in the light-transmitting ceramic discharge vessel.
  • the high-pressure discharge lamp shown in FIG. 1 is specified as follows.
  • the light-transmitting ceramic discharge vessel is made of YAG and has the bulging section 1a having a length of 6 mm long and thickness of 0.5 mm, and the small-diameter cylindrical section 1b having an outer diameter of 1.8 mm and a total length being 35 mm.
  • the seal part 2a is a niobium bar having an outer diameter of 0.64 mm
  • the halide-resistant section 2b (the electrode as well) is a tungsten bar having an outer diameter of 0.3 mm.
  • the discharge medium contains 0.6 mg of, 0.6 mg of TlI, 0.4 mg InI and mercury 5 mg, and approximately 20 kPa of argon is filled as a relaxation gas.
  • the length of the projection d2 of the electrode projected into the bulging section of the light-transmitting ceramic discharge vessel is set to 2 mm, and twenty high-pressure discharge lamps are manufactured, wherein the distance d1 between the distal of the electrode and the inner surface of the light-transmitting ceramic discharge vessel is changed within and beyond the scope of the present invention.
  • Table 1 shows a result of comparing the probabilities of starting errors thereof using a discharge lamp lighting circuit (non-loaded secondary voltage: 4.5 kV).
  • Distance d1 (mm) Starting Error Probability (%) 0.4 100 0.6 95 0.8 55 1.0 0 1.2 0 1.4 0
  • FIG. 3 is a sectional view showing a second embodiment of the high-pressure discharge lamp according to the present invention.
  • the same parts as those in FIG. 1 are designated at the same reference numerals as those used to designate the same parts, and detailed description of those parts will be omitted herefrom.
  • the present embodiment differs from the first embodiment in that the bulging section 1a of the light-transmitting ceramic discharge vessel 1 is formed into an elliptical spherical shape to enlarge the distance between the electrodes relatively.
  • FIG. 4 is a sectional view showing a third embodiment of the high-pressure discharge lamp according to the present invention.
  • the same parts as those in FIG. 1 are designated at the same reference numerals as those in FIG. 1, and detailed description of those parts will be omitted herefrom.
  • the present embodiment is different in that the high-pressure discharge lamp is not sealed in an outer tube but is constructed in a structure suitable for lighting.
  • the seal part 2a of the power-supplying conductor is not structured to be exposed in the air, because the seal part 2a of the power-supplying conductor can be easily oxidized.
  • a platinum bar 5 is welded to the end of the seal part 2a and the first seal 4 is formed. Thereafter, a ceramic tube 4 is engaged on the portion of the seal part 2a which is exposed to the outside from the seal 4.
  • a ceramic-sealing compound is applied to the end of the ceramic tube 5 and is melted with heat to form a second seal 7.
  • the seal part 1a positioned outside the light-transmitting ceramic discharge vessel 1 is coated airtightly by the ceramic tube 6 and the second seal 7 so that the high-pressure discharge lamp can be lighted in the air without sealing it air-tightly in the outer tube.
  • the length of the small-diameter cylindrical section differs between the sections 1b and 1b' in the present embodiment.
  • FIG. 5 is a partially cutaway central front view showing a bulb type high-pressure discharge lamp as an embodiment of a lighting apparatus according to the present invention.
  • the same parts as those in FIG. 1 are designated at the same reference numerals, and detailed description of those parts will be omitted herefrom.
  • the bulb type high-pressure discharge lamp according to the present embodiment comprises a high-pressure lamp device 11, a discharge lamp lighting device 12, a power-receiver means 13 and a case 14.
  • the high-pressure discharge lamp device 11 includes a high-pressure lamp 11a and a reflector 11b.
  • this high-pressure discharge lamp 11a uses a high-pressure discharge lamp according to the present invention, the lamp shown in FIG. 4 is particularly preferred in this case.
  • the reflector 11b includes a light-projection opening 11b1, a reflecting surface 11b2 and a top opening 11b3.
  • the small-diameter cylindrical section 1b in the top side is fixed to the top opening 11b3 with an inorganic adhesive 11c, thereby supporting the high-pressure discharge lamp 11a, in a manner that the bulging section of the high-pressure discharge lamp 11a substantially corresponds to the focus of the reflector 11b. Since the small-diameter cylindrical section 1b' of the light-transmitting ceramic discharge vessel provided in the high-pressure discharge lamp does not project forward from the light-projection opening 11b1 of the reflector 11b, light distribution is not disturbed.
  • the discharge lamp lighting device 12 includes a high frequency inverter and a current limiter means, and lights the high-pressure discharge lamp 11a.
  • the discharge lamp lighting device 12 is provided in the back side of the reflector 11b of the high-pressure discharge lamp 11a. The heat caused by lighting of the high-pressure discharge lamp 11a is shielded by the reflector 11b so that the discharge lamp lighting device 12 operates stably.
  • the power-receiver means 13 is formed of a screw base and receives electricity thereby energizing the discharge lamp lighting device 12, when the screw base is attached to a lamp socket (not shown).
  • the case 14 stores the structural elements described above to hold them at predetermined positions, the case 14 has a streamlined part which increases its applicability to lighting devices such as a down light and the like.
  • a small, high-pressure discharge lamp which starts operation easily, allows easy transition from glow discharge to arc discharge, and prevents blackening of the light-transmitting ceramic discharge vessel caused by sputtering.

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  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Discharge Lamps And Accessories Thereof (AREA)
  • Discharge Lamp (AREA)
EP99929830A 1998-07-24 1999-07-14 Lampe a decharge haute tension et dispositif d'eclairage Withdrawn EP1041603A4 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP21012098 1998-07-24
JP21012098A JP4297227B2 (ja) 1998-07-24 1998-07-24 高圧放電ランプおよび照明装置
PCT/JP1999/003797 WO2000005746A1 (fr) 1998-07-24 1999-07-14 Lampe a decharge haute tension et dispositif d'eclairage

Publications (2)

Publication Number Publication Date
EP1041603A1 true EP1041603A1 (fr) 2000-10-04
EP1041603A4 EP1041603A4 (fr) 2001-11-07

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EP99929830A Withdrawn EP1041603A4 (fr) 1998-07-24 1999-07-14 Lampe a decharge haute tension et dispositif d'eclairage

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EP (1) EP1041603A4 (fr)
JP (1) JP4297227B2 (fr)
KR (1) KR100354851B1 (fr)
WO (1) WO2000005746A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1494261A2 (fr) * 2003-06-26 2005-01-05 Matsushita Electric Industrial Co., Ltd. Lampe aux halogénures métalliques avec une chambre à décharge à configuration particulière
EP1187178A3 (fr) * 2000-09-08 2005-08-10 Philips Intellectual Property & Standards GmbH Lampe a décharge gazeuse et système d'éclairage

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Publication number Priority date Publication date Assignee Title
US6414436B1 (en) 1999-02-01 2002-07-02 Gem Lighting Llc Sapphire high intensity discharge projector lamp
JP4892807B2 (ja) * 2001-09-26 2012-03-07 岩崎電気株式会社 金属蒸気放電灯及びその製造方法
JP2003132839A (ja) 2001-10-30 2003-05-09 Matsushita Electric Ind Co Ltd メタルハライドランプ
JP4037142B2 (ja) * 2002-03-27 2008-01-23 東芝ライテック株式会社 メタルハライドランプおよび自動車用前照灯装置
JP2017027765A (ja) 2015-07-22 2017-02-02 セイコーエプソン株式会社 放電灯、放電灯の製造方法、光源装置、およびプロジェクター
JP2017041396A (ja) 2015-08-21 2017-02-23 セイコーエプソン株式会社 放電灯、光源装置及びプロジェクター

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KR100354851B1 (ko) 2002-10-05
JP4297227B2 (ja) 2009-07-15
WO2000005746A1 (fr) 2000-02-03
EP1041603A4 (fr) 2001-11-07
JP2000048769A (ja) 2000-02-18
KR20010023968A (ko) 2001-03-26

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