JP4181949B2 - High pressure discharge lamp and lighting device - Google Patents

Description

  The present invention relates to a high-pressure discharge lamp in which a metal halide is sealed in an arc tube composed of a translucent ceramic discharge vessel, and an illumination device for the discharge lamp.

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

  A metal halide lamp is a discharge lamp in which a discharge medium composed of an electrode structure and a metal halide, mercury, and a rare gas is enclosed in an arc tube, and utilizes emission light of a spectrum line of encapsulated metal atoms and a molecular spectrum of metal halide. Thus, the lamp can obtain higher luminous efficiency, correlated color temperature, and color rendering than a mercury lamp.

  As the light emitting metal of this metal halide lamp, in addition to Hg, metals such as Na, In, Tl, Li, and Cs or rare earth metals such as Dy, Ho, Tm, Sc, Nd, and Ce are used as halides such as iodine and bromine. It is enclosed in an arc tube and is configured to exhibit high emission characteristics.

  However, for example, even if high luminous efficiency is obtained, color rendering is low, or conversely, color rendering is high but efficiency is low, or efficiency varies depending on the lighting direction of the lamp. It has been difficult to find a discharge lamp exhibiting excellent values in a plurality of characteristics, such as properties and lifetime.

  Recently, a compact arc tube container made of a material made of translucent ceramics, which has less reaction with the metal halide than quartz glass and has excellent corrosion resistance and heat resistance, has been developed. Metal halide lamps have emerged that can achieve efficiency, correlated color temperature, color rendering and long life.

  In addition, the use of metal halide lamps filled with metal halides has expanded, and there are many cases where they are lit in various directions. However, depending on the lighting direction, if the lamp type is not changed, the characteristics of the lamp will change greatly. As a result, the efficiency may be reduced, the irradiation surface may become uneven, or the lamp may be turned off or may have a short life.

For example, a metal halide containing a rare earth metal halide and sodium halide is added in an arc tube made of a translucent ceramic container in an amount such that the sodium halide is 10 to 100% by weight with respect to the rare earth metal halide. A high-pressure discharge lamp enclosed (DyI ₃ 55 Wt%: NaI ₃₀ Wt%: TlI 15 Wt%), with a luminous efficiency of 96 Lm / W, a color temperature of 4100 K (3500 to 5000 K), and an average color rendering index (Ra) of 95. Patent Document 1 describes that the difference in extinction voltage between vertical lighting and horizontal lighting is small while exhibiting high light emission characteristics.
Japanese Patent No. 3293499 (3rd page paragraph [0011], 4th page paragraph [0025]) However, when a prototype of a lamp was manufactured in accordance with this Patent Document 1 and its characteristics were measured, it was described in Reference 1 as an example. Some lamps having power different from the rated power used cannot obtain desired light emission characteristics.

  On the other hand, in the high-pressure discharge lamp described in Patent Document 1, there is no description of the dimensions for the lamp structure and the dimensions for determining the temperature (cold point) for determining the evaporation of the enclosed metal halide. Depending on the type of rare earth halide used, there is a concern that the described characteristics cannot be obtained.

Also, the total amount of cerium halide (20 to 69 wt%), sodium halide (30 to 79 wt%), thallium halide and indium halide (Tl and In halide) in the arc tube composed of a translucent ceramic container. Patent Document 2 describes that a metal halide lamp encapsulated with a combination of 1 to 20 wt% (100 wt% in total) can achieve high luminous efficiency (117 Lm / W or more) and suppression of reduction in luminous flux maintenance factor.
JP 2003-16998 A (page 1 [claims], page 3 paragraph [0021], page 3 paragraph [0024], page 4 paragraph [0025]) Although the prototype lamp exhibits high luminous efficiency and luminous flux maintenance factor, the luminous color of the lamp becomes extremely green and the average color rendering index is 75 or less, which is useful for stores and outdoor lighting. Was unsuitable.

  Therefore, the present inventors have selected and confirmed various kinds of luminescent metal materials, their ratios, encapsulated amounts, etc., and found that excellent characteristics can be obtained in various luminescent characteristics without being limited by the lighting direction of the lamp. .

  The present invention reduces the fluctuations of various light emission characteristics such as efficiency, correlated color temperature, color rendering properties and lifetime due to the lamp lighting direction by regulating the light emitting metal material, its encapsulation ratio and xy chromaticity. Thus, it is an object of the present invention to provide a high-pressure discharge lamp such as a metal halide lamp that emits white light without having to prepare different lamp types for each lighting direction (use), and an illumination device equipped with the discharge lamp.

A high-pressure discharge lamp according to a first aspect of the present invention is a translucent ceramics discharge vessel having a pair of small-diameter cylindrical portions whose inner diameter is smaller than the bulge portions provided at both ends of the bulge portions forming the discharge space, and the discharge vessel A pair of electrode assemblies hermetically sealed in each small-diameter cylindrical portion, and a pair of electrode assemblies connected to the introduction conductor and extending in the small-diameter cylindrical portion and facing the tip in the bulging portion, in the discharge vessel An arc tube comprising a discharge medium containing a metal halide and a starting gas in which halides of Na, Tl, In, and Tm encapsulated in the metal are 90% by weight or more of the total encapsulated amount, and the arc tube inside the tube axis And a pair of power supply members sealed at the end of the outer tube and electrically connected to the introduction conductor of the arc tube and holding the arc tube and comprising, correlated color temperature is 35 0～5000K, in general color rendering index (Ra) is 75 to 90, and, in the discharge lamp efficiency emits radiation 90~120lm / W,
The relationship between the amount M (mg) of metal halide enclosed in the arc tube and the space volume V (mm ³ ) in the small-diameter cylindrical portion at the end of the arc tube, M / V is 0.2 or more, and Tm halide 20 to 70 wt% of the encapsulated total ratio of metal halide, and a wall loading is 12~35W / cm ^2, x-y chromaticity coordinates of the entire lighting direction in lamp life (CIE 1931) The chromaticity deviation (duv.) Above is in the range of −0.006 to +0.010, preferably −0.003 to +0.007.

  The high-pressure discharge lamp of the present invention is a light emitting metal material, In that exhibits a light emission peak in a blue region (near 450 nm), Tm that exhibits a number of light emission peaks in a blue-green region (near 450 to 530 nm), and a green region (near 535 nm). ), Halides mainly composed of 4 types, ie, Tl exhibiting an emission peak and Na exhibiting an emission peak in the red region (near 590 nm) are encapsulated.

  That is, a continuous emission spectrum in the visible region can be obtained by encapsulating the luminescent metal, and In has an effect of adjusting the light color by blue light emission, and Tl has an effect of adjusting the light color and improving the efficiency. Further, Na increases the efficiency and lowers the turn-off voltage and improves the lighting direction fluctuation characteristics, and Tm increases the color rendering properties.

  If the halide of Na, Tl, In, and Tm is enclosed in an amount of 90% by weight or more of the total amount of metal halide, the spectral distribution radiated is greatly affected during the lamp life regardless of the lighting direction. The desired light emission characteristics can be obtained without exerting any influence.

  That is, with the metal halide and the encapsulating ratio, the color characteristics of the lamp, particularly the chromaticity, on the xy chromaticity coordinates (CIE 1931) are not affected by the lamp voltage that changes depending on the lighting direction during the life of the lamp. Chromaticity deviation (duv.) In the range of −0.006 to +0.010, preferably −0.003 to +0.007, so that stable color characteristics can be obtained during the lifetime regardless of the lighting direction of the lamp. Is obtained.

  In the present invention, the term “during lamp life” refers to the entire period from the beginning of lighting to the rated life.

  In general, in the case of a lamp in which Na halide and rare earth halide are enclosed, when the lighting direction is changed from vertical to horizontal, the arc tube temperature rises, so that light emission in the red region spreads, and the correlated color temperature. , And the chromaticity deviation (duv.) Changes in the negative direction. However, the lamp of the present invention has the chromaticity of xy chromaticity coordinates due to the effect of the combination of halogenated Tm and halogenated In. It changes along the black body radiation locus (Black Body Line-BBL) of (CIE 1931).

  Further, the luminous characteristics of the lamp have been the best when the lamp is vertically lit (Base Up-BU, Base Down-BD), and when the lamp is lit horizontally (Base Horizon). -BH) has the worst characteristics, and the light emission characteristics at the time of tilting lighting are often in the middle between vertical (BU) lighting and horizontal (BH) lighting.

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

  Materials for forming the discharge vessel of the arc tube include sapphire, ceramics such as aluminum oxide (alumina), yttrium-aluminum-garnet oxide (YAG), yttrium oxide (YOX), and aluminum nitride (AlN). Those having high translucency, heat resistance and corrosion resistance from halides can be used.

  The shape of the discharge vessel consists of an oval, spherical or cylindrical shape, or a cylindrical portion having a smaller diameter than the bulging portion integrally or integrally at both ends where the central portion bulges. The sealing portion is formed by hermetically closing the opening of the small-diameter cylindrical portion. The sealing portion can be formed by means such as closing the outer end opening side of the small-diameter cylindrical portion with a plug such as metal, ceramic, or cermet, or a filler such as a heat-resistant adhesive.

  Moreover, said translucency has the light transmittance which can permeate | transmit the light which generate | occur | produced by discharge, and can discharge | release it outside, and it may be not only transparent but light diffusivity. Moreover, the part which is not mainly radiating | emitting by discharge, such as a small diameter cylindrical part of a container edge part, may be light-shielding.

  Further, in the present invention, although not limited depending on the rating of the lamp, the maximum inner diameter of the bulging portion that forms an elliptical, spherical or cylindrical shape forming the discharge space of the discharge vessel is about 4 to 30 mm, The internal total length is about 30 to 90 mm, and the internal volume is about 0.02 to 5.0 cc, preferably about 0.2 to 4.5 cc.

  The pair of electrode assemblies are sealed by inserting electrode shafts through small-diameter cylindrical portions at both ends of the discharge vessel so as to face each other in the vessel, and the material is tungsten W or doped tungsten. The electrode portion at the tip of the electrode structure can be wound with a coil made of the above material as necessary in order to increase the surface area and improve heat dissipation.

  In addition, the electrode shaft portion at the base end of the electrode structure functions to fix the electrode at a predetermined position with respect to the discharge vessel and to introduce current from the outside, and the base end portion is welded to the tip of the introduction conductor. It is electrically and mechanically supported by fixing with.

  The lead-in conductor penetrates through an adhesive (sealant) that hermetically seals the inside of the small-diameter cylindrical portion of the ceramic discharge vessel, and connects to the inside and outside of the plug that hermetically closes the opening of the small-diameter cylindrical portion. The portion that penetrates and is fixed through the plug and is led out from the end of the small-diameter cylindrical portion is used to support the arc tube.

  As the material of the introduction conductor, a sealing metal such as niobium Nb, tantalum Ta, titanium Ti, zirconium Zr, hafnium Hf, or vanadium V is used to form a rod-like body, a pipe-like body, a coil-like body, or the like. Yes. And the selection can be suitably selected according to the thermal expansion coefficient of the material of the ceramic discharge vessel.

  The discharge medium is filled with a mercury Hg containing a halide mainly composed of sodium Na, thallium Tl, indium In, and thulium Tm as the light emitting metal and, if necessary, amalgam. The Na, Tl, In, and Tm halides are preferably encapsulated in an amount of 90% by weight or more of the total amount of metal halides encapsulated. Further, by adding at least one halide of cerium Ce and praseodymium Pr to the above halide in an amount of 10% by weight or less of the total amount of metal halides added, the luminous efficiency can be further increased, which exceeds 10% by weight. This is not preferable because it causes a phenomenon in which greening becomes a strong emission color. A small amount of other metal halides may be added.

In addition, if 40% by weight or more of the total amount of the enclosed metal halide is a halide of a rare earth metal such as Tm, Tm and Ce, Tm and Pr, Tm, Ce and Pr, it is white and has luminous efficiency. If the total encapsulated amount is less than 40% by weight, the color temperature may be as low as 3500K or less. In addition, if the amount of the rare earth metal halide is too large, the discharge ratio of the rare earth metal halide is 40 to 70 in consideration of the fact that the discharge vessel reacts with the rare earth metal and causes a decrease in the luminous flux maintenance factor. About% by weight was preferred.

  In addition, if 20% by weight or more of the total amount of the enclosed metal halide is Tm halide, it exhibits a spectrum in the blue-green region of 450 to 530 nm, and has the effect of increasing luminous efficiency. In consideration of the fact that the discharge vessel reacts with the rare earth metal and causes a decrease in the luminous flux maintenance factor, the Tm encapsulation rate is preferably about 20 to 70% by weight.

  In addition, the weight ratio (InX / TmX) of the In halide (InX) to the Tm halide (TmX) sealed in the arc tube is 0 <InX / TmX ≦ 0.15, and an appropriate amount of indium halide is used. As a result, an effect of adjusting the color temperature is obtained, and an improvement in efficiency due to the spectrum of sodium, adjustment of the color temperature, and high color rendering properties due to the continuous spectrum of the rare earth metal are obtained. If this indium halide is present even in a small amount, the above effect is achieved. However, if it exceeds 15% by weight (0.15) with respect to thulium halide, the spectrum in the blue region becomes too strong, and the luminous efficiency is lowered. There is an inconvenience that the light emission color becomes blue-green. Considering this decrease in light emission efficiency and color shift, about 1 to 13% by weight is preferable.

  Further, the weight ratio (InX / TmX) of the In halide (InX) to the Tm halide (TmX) enclosed in the arc tube is 0 <InX / TmX ≦ 0.15, and a halide of Tl. The weight ratio (InX / TlX) of In halide (InX) to (TlX) is preferably 0.05 <InX / TlX ≦ 0.5.

  When the weight ratio of the halide of Tm and In is the same as that described above, and the indium halide content relative to thallium halide is less than 5% by weight (0.05), the emission spectrum of thallium becomes strong, There is a problem that the lamp light color is green, and if it exceeds 50% by weight (0.5), there is a problem that the light emission efficiency is lowered.

  Note that X in the above halide refers to iodine I, bromine Br, chlorine Cl, or fluorine F.

  As the halogen, one or more of iodine I, bromine Br, chlorine Cl, and fluorine F can be used. The amount of the metal halide enclosed is about 2 to 20 mg per 1 cc of the container internal volume, but is determined according to the light emission characteristics, the lamp power, the internal volume of the discharge container, or the like.

  In addition, a rare gas such as argon Ar or neon Ne as a starting and buffering gas is sealed in an amount of about 8 kPa to 80 kPa (Pascal), and exhibits a pressure of about 500 kPa or more during lighting. In addition, if the enclosure pressure of the rare gas is less than 8 kPa, it is difficult to start discharge as shown in the Paschen curve, and if it exceeds 80 kPa, the starting voltage becomes high and exceeds the pressure resistance of the base.

  Outer tube is A-type, AP-type, B-type, BT-type formed of a material having translucency and heat resistance made of glass such as quartz glass, borosilicate glass, semi-rigid glass or ceramics. ED type, R type, T type, etc., and a seal holding the arc tube by inserting the mount holding the arc tube from the opening at the end, and heating and sealing this opening with a burner. Is formed. In addition, the said sealing part may be formed in the both ends in the case of outer tubes, such as T (straight tube) type.

Further, the inside of the outer tube may be in a vacuum atmosphere or may be filled with a rare gas such as nitrogen N ₂ or argon Ar.

  The power supply member only needs to be formed of a single material. However, since the portion sealed in the sealing portion requires a material that is airtight and compatible with glass, the power supply line portion in the outer tube and the sealing portion It is appropriate to connect and configure multiple materials such as the sealing member part and the external lead part led out of the outer tube, and the materials, dimensions, etc. are the types of arc tube, power, weight, outer tube material, etc. You can select as appropriate according to your needs.

  Further, in the case of a discharge vessel having a small diameter cylindrical portion at the end, a coiled portion is wound on the outer surface side of the small diameter cylindrical portion facing the electrode shaft disposed inside, and this coiled portion is By connecting to the potential side opposite to the electrode shaft as an auxiliary electrode at the time of starting the lamp, the starting of the lamp can be facilitated.

  In addition, the feeding line portion in the outer tube of the feeding member is made of a metal material such as molybdenum Mo or tungsten W, and is electrically connected to the introduction conductors at both ends of the luminous tube to supply power, and the luminous tube and the middle tube are connected to the tube axis. It also serves as a support member that is arranged and held along the line.

  Furthermore, a getter such as a zirconium Zr-aluminum Al alloy for cleaning the inside of the outer tube may be provided on a power supply line in the outer tube.

  Furthermore, although not an essential member, an inner tube made of a heat-resistant and translucent material made of ceramic, quartz glass, or hard glass similar to the container can be provided surrounding the arc tube. With this inner tube, the arc tube can be kept warm and the luminous metal can be easily actuated to improve the luminous characteristics such as high efficiency and high color rendering, and at the same time, protect the arc tube container in the event of damage.

Further, the high-pressure discharge lamp of the present invention includes a sealed within the arc tube metal halide amount M (mg), the relationship M / V of the spatial volume V of the smaller cylindrical portion of the arc tube end (mm ³⁾ is 0.2 or more and the wall load is Ru 12~35W / cm ² der.

The relationship M / V between the enclosed amount M (mg) of the metal halide and the space volume V (mm ³ ) in the small-diameter cylindrical portion at the end of the arc tube indicates the space in the small-diameter cylindrical portion (the small-diameter cylindrical portion and The filling ratio of the metal halide into the gap between the introduced conductor) is equivalently shown, and the small value of M / V means that the amount of metal halide enclosed M is small or the small diameter cylinder As the space volume V in the shape portion is large, there are few metal halides in the space, the metal halide easily moves, the temperature at the coldest part changes greatly, and the color characteristic change of the lamp also increases accordingly. The minimum M / V value is about 0.2.

On the contrary, when the value of M / V is large, the amount of metal halide enclosed M is too large, or the space volume V in the small-diameter cylindrical portion is small, so that the amount of metal halide enclosed M in the space is small. If there is a large amount of impurities, the amount of impurities such as H ₂ O will increase, leading to problems such as an increase in starting voltage and blackening of the container, leading to a rapid decrease in luminous flux, and variations in M / V values. In consideration of the above, the maximum is preferably about 5.0.

Further, with respect to the tube wall load (lamp power (W) per unit inner surface area (cm ² ) of the discharge space portion), the above results are obtained with a lamp having a relatively high load of about 12 to 35 W / cm ^2. was gotten.

  Further, in the translucent ceramic discharge vessel having the small-diameter cylindrical portions at both ends of the bulging portion forming the discharge space, the small-diameter cylindrical portion (the coldest portion) reduces the thermal resistance, and the temperature distribution of the arc tube is reduced. Uniformity is achieved.

And as for this invention, if the metal halide enclosed and tube wall load (12-35 W / cm < ² >) were the said control range, the desired light emission characteristic was acquired by control of M / V. This is because an arc tube made of a discharge vessel made of ceramics such as alumina has a higher thermal conductivity than quartz glass, so the arc tube temperature distribution during lamp operation is uniform, and the amount M of metal halide enclosed and the small diameter tube It is presumed that the control of the ratio of the space volume V in the shaped part is due to indirectly controlling the coldest part temperature.

In the high-pressure discharge lamp of the invention of claim 2 , when the lamp is lit, the metal halide is within a range of ½ of the entire length of the small-diameter cylindrical portion from the inner end facing the discharge space side of the small-diameter cylindrical portion at the arc tube end. It is characterized by the existence.

  When the lighting direction of the lamp changes, the metal halide moves and the coldest part temperature changes and affects the color characteristics such as the correlated color temperature and the average color rendering index. If the amount of filling is such that the presence of metal halide can be confirmed visually on the inner end facing the discharge space, stable color characteristics are exhibited regardless of the lighting direction when the lamp is lit.

The high-pressure discharge lamp of the present invention is characterized in that it emits radiated light having a correlated color temperature of 3500 to 5000 K, an average color rendering index (Ra) of 75 to 90, and an efficiency of 90 to 120 l m / W. Yes.

With the configuration described in claim 1 , a balanced high-pressure discharge lamp that exhibits high efficiency, correlated color temperature, and average color rendering index can be obtained.

High-pressure discharge lamp of the invention of claim 3 is operated at the rated power 10～1000W, color temperature variation value at the time of horizontal lighting vertical lighting Ru have as equal to or less than 500K.

Discharge lamp filled with metal halide, by lighting posture emission characteristics and electrical characteristics also vary, but the claims 1 or 2, such as efficiency and color temperature vapor pressure changes of the coldest portion temperature changes halide With the described configuration, the correlated color temperature fluctuation of the lamp can be suppressed to 500K or less.

  The reason why the correlated color temperature fluctuation is regulated to 500K or less is that a temperature difference exceeding 500K can be recognized by a visual difference.

  The reason why the rated power of the lamp is set to 10 to 1000 W is that the lighting direction is limited in the conventional lamp, but by adopting the configuration of the present invention, the light emission characteristics can be improved without limiting the lighting direction. The rated power of 10 to 1000 W is a lamp with a rating of 10 to 1000 W, and has a tolerance of ±.

According to a fourth aspect of the present invention, there is provided a lighting device main body, the high pressure discharge lamp according to any one of claims 1 to 3 provided in the main body of the lighting device, and lighting circuit means for lighting the high pressure discharge lamp. It is characterized by comprising.

  The illuminating device main body refers to the remaining part of the illuminating device excluding the high-pressure discharge lamp and the lighting circuit means. The lighting circuit means of the high-pressure discharge lamp is not limited, but can be lit with a rectangular wave with a lighting frequency of 100 Hz to 1 kHz, for example. In this case, when lighting at a frequency of less than 100 Hz, the arc fluctuates during lighting. Further, in lighting with a frequency exceeding 1 kHz, an arc sway is generated due to an acoustic resonance phenomenon, and a decrease in luminous flux with the progress of lighting, that is, a decrease in luminous flux maintenance factor is large.

  In this case, the secondary open-circuit voltage is lit at 150 to 400 V, and when starting at less than 150 V, there is a problem that the transition from glow discharge to arc discharge cannot be made. When the voltage exceeds 400 V, the applied voltage to the electrode is too high. Therefore, there is a problem that blackening occurs in the arc tube.

  In addition, in this invention, an illuminating device is a wide concept including all the apparatuses which use light emission of a high pressure discharge lamp for a certain purpose. For example, the present invention can be applied to a bulb-type high-pressure discharge lamp device, a lighting fixture, a moving body headlamp, an optical fiber light source device, an image projection device, a photochemical device, a fingerprint discrimination device, and the like.

According to the first to third aspects of the present invention, a predetermined amount of a light emitting metal containing Na, In, Tl, and Tm halides as a main component is encapsulated, whereby power, efficiency, correlated color temperature, average color rendering index (color rendering properties). ) And lifetime, and other high-pressure discharge lamps such as metal halide lamps that emit stable white light with a small amount of change regardless of the lighting position of the lamp.

  Incidentally, in the lamp of the above embodiment, the maximum amount of change between vertical lighting and horizontal lighting (including inclined lighting) is within ± 15% of the power when the vertical (BU) lighting is used as a reference. As the efficiency is within ± 15%, the average color rendering index is less than 10 points, and the chromaticity deviation (duv.) Is less than 0.0150, the characteristic change amount can be reduced as compared with the conventional lamp.

  Therefore, the restrictions on the lamp due to the lighting posture can be relaxed, the use of the same type of lamp can be expanded, the number of lamp types can be reduced, and the productivity can be improved.

According to a fourth aspect of the present invention, since the high-pressure discharge lamp according to any one of the first to third aspects is provided, a lighting device such as a lighting fixture having excellent light emission characteristics and electrical characteristics is provided. can do.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic front view showing a first embodiment of a high-pressure discharge lamp according to the present invention, and FIG. 2 is an enlarged longitudinal front view showing an arc tube portion in FIG.

  In the figure, a high-pressure discharge lamp L1 contains therein a luminous tube 1A, a middle tube 3 surrounding the luminous tube 1A, and a pair of feeding members 4A and 4B that support the luminous tube 1A and the middle tube 3 and supply power. The outer tube 5 and the base 6 provided at the end of the outer tube 5 are mainly used.

  The arc tube 1A includes a discharge vessel 1 made of translucent ceramics integrally formed with small-diameter cylindrical portions 12a and 12b connected to both ends of a substantially spherical bulging portion 11 by continuous curved surfaces. Linear lead-in conductors 23a, 23b made of Nb connected to the electrode assemblies 2A, 2B are hermetically sealed by the glass adhesives 13, 13 through the ends of the small diameter cylindrical portions 12a, 12b of the discharge vessel 1. It has a vertically symmetrical structure.

  The electrode assemblies 2A and 2B are butt welded to each other via coil-like portions 25a and 25b, which are located in the small-diameter cylindrical portions 12a and 12b and wound with a molybdenum wire around the introduction conductors 23a and 23b. The electrode shaft 21 is made of a tungsten wire with the side facing the bulging portion 11, and the coiled electrode 22 has a tungsten wire wound around the tip of the electrode shaft 21.

  At this time, the gap between the electrode shaft 21 penetrating through the small diameter cylindrical portions 12a and 12b and the inner wall surface of the small diameter cylindrical portions 12a and 12b is 0.1 mm or less. A coil made of a thin wire such as molybdenum may be wound around to reduce the gap, and the outer surface of the coil may be in contact with the inner surfaces of the small diameter cylindrical portions 12a and 12b. Further, the coiled electrode 22 at the tip of the electrode shaft 21 is not essential, and the tip of the electrode shaft 21 may perform an electrode function.

  Further, in the discharge vessel 1 of the arc tube 1A, a start-up and buffer gas containing argon as a discharge medium, and a metal halide and mercury as a luminescent metal are enclosed.

This metal halide is formed from sodium iodide NaI, thallium iodide TlI, indium iodide InI and thulium iodide TmI ₃ at a weight ratio (wt%) of 30: 15: 5: 50, for example.

  The outer tube 5 is formed of quartz glass or the like and has a BT shape in which one end (upper side in the figure) is closed, and a mount holding the arc tube 1A is inserted through the opening on the other end (lower) side. A sealing portion 51 is formed in which the opening is heated by a burner and the stem 4s of the mount is welded and closed. Further, the inside of the outer tube 5 is a vacuum atmosphere exhausted through an exhaust pipe (not shown) after the sealing portion 51 is formed, or a rare gas atmosphere in which nitrogen N 2, argon Ar, or the like is enclosed.

  The pair of power supply members 4A and 4B are connected to one end side of the internal lead wires 41a and 41b extending from the sealing wire hermetically sealed to the stem 4s of the mount and extend into the outer tube 5 ( A feed line 42a, 42b made of a rod or plate), an external lead (not shown) made of a molybdenum wire connected to the other end and extending outside the outer tube 5, and the one feed line 42a. And the support members 43a and 43b of the arc tube 1A and the middle tube 3 provided in the above.

  The one power supply line 42a is bent so that the tip side formed in a substantially V shape is separated and parallel, and the extended tip portion is disposed so as to elastically contact the top inner wall of the outer tube 5 having a BT shape. Has been. Further, a metal plate, a ceramic plate, or the like is formed into a disk shape or a belt shape at the intermediate portion of the parallel power supply line 42a. Here, the disk-shaped support members 43a and 43b are directly spaced apart by means such as welding. .. Are connected via fixing members 44... To firmly hold between the power supply lines 42 a and 42 a.

  The arc tube 1A is supported by inserting the small-diameter cylindrical portions 12a and 12b of the discharge vessel 1 into a through hole formed in the center of the spaced disc-shaped support members 43a and 43b and supporting members 43a and 43b. The intermediate tube 3 is disposed and fixed via fixing members 44,... In a state surrounding the arc tube 1A.

  Further, the support member 43a connected to one power supply line 42a and the introduction conductor 23a are connected via a conductive wire 45, and the other power supply line 42b bent and extended in a substantially L shape is connected to the tip. The lead conductor 23 b is connected via a conductive wire 46.

  Therefore, the portions of the power supply lines 42a and 42b extending into the outer tube 5 of the power supply members 4A and 4B are electrically connected to the introduction conductors 23a and 23b at both ends of the arc tube 1A to supply power and the arc tube 1A. Arranged and held along the tube axis.

  Then, the sealing part 51 of the outer tube 5 is provided with a cap 6 depending on the type and application, and an external lead wire is connected to the terminal part of the base 6 to complete the discharge lamp L1.

  When the discharge lamp L1 is attached to the socket at the base portion 6 and is energized from a rectangular wave lighting circuit device of 100 Hz to 1 kHz (not shown), the introduction conductors 23a of the arc tube 1A through the base 6 and the power supply members 4A and 4B. A voltage is applied to the electrode assemblies 2A and 2B through 23b to cause a discharge between the coiled electrodes 22 and 22 at the tip, thereby enabling stable lighting.

In this metal halide lamp L1, the enclosed metal halides are NaI, TlI, InI and TmI ₃ , NaI is mainly in the red region, TlI is mainly in the green region, InI is mainly in the blue region, and TmI ₃ is It has a radiation spectrum mainly in the blue-green region, has a luminous efficiency of 90 to 130 Lm / W, a correlated color temperature of 3500 to 5000 K, and an average color rendering index (Ra) of 75 to 90 without reducing the luminous efficiency. And a high-quality high-pressure discharge lamp L1 that exhibits excellent values in various emission characteristics such as emitting white radiant light.

In addition, as a result of confirmation by the inventors of the present invention, by regulating the InI weight ratio InI / TmI ₃ with respect to TmI ₃ among the above-described light emitting metals to 0 to 0.15, the color rendering property is reduced without reducing the light emission efficiency. It has been found that a high-pressure discharge lamp L1 that enhances and emits white radiation can be provided.

Also, with regulating the weight ratio InI / TmI ₃ of InI to said TmI _3, by 0.05 to 0.5 weight ratio InI / TlI3 of InI for TlI _3, black body radiation locus in the chromaticity coordinates It has been found that it is possible to provide a high-pressure discharge lamp L1 that emits excellent white light with a balanced red, green, and blue color located at coordinates very close to (BBL).

  In the high-pressure discharge lamp L1 of the above-described embodiment, the arc tube 1A is integrally formed with a small-diameter cylindrical portion 12a (12b) connected to both ends of the bulging portion 11 having a substantially spherical shape by a continuous curved surface (FIG. 3). Although the discharge vessel 1 has the structure shown in a), the discharge vessel 1 forming the arc tube integrally forms a small-diameter cylindrical portion 12a (12b) as shown in FIGS. 3B and 3C. It may be a structure.

  3A to 3C are schematic longitudinal front views showing one end side of the arc tube having various structures (the other end side is also a symmetric structure, and is omitted here). The same parts are denoted by the same reference numerals, and the description thereof is omitted.

  The arc tubes 1B and 1C shown in FIGS. 3 (b) and 3 (c) have a bulging portion 11 and a small-diameter cylindrical portion 12a (12b) separately formed of a translucent ceramic material. A small diameter cylindrical portion 12a (12b) is inserted into the opening portion 11a and hermetically sealed with the glass adhesive 14 and is normally sealed by a shrink fitting method. In addition, the difference between this figure (b) and (c) differs in the sealing position of the small diameter cylindrical part 12a (12b).

  Examples of the present invention will be described below together with comparative examples (conventional).

  FIG. 1 is a high-pressure discharge lamp having the same configuration as in FIGS. 1 and 2, and Example 1 is a discharge vessel 1 of an integrally formed type in which an arc tube 1 </ b> A has the same structure as that shown in FIG.

  In Example 2, the arc tube 1A was provided with a shrink-fitted discharge vessel 1 having the same configuration as that shown in FIG. 3B. A lamp was prototyped with the following specifications and various characteristics were measured.

  The lamp has a rated power of 250 W, a rated life of 12000 hours, the arc tube 1A is made of translucent alumina ceramics, has a total length of about 60 mm, an outer diameter of the bulging portion 11 of about 16.6 mm, an inner diameter of about 14.0 mm, and an internal volume of about The outer diameter of the small diameter cylindrical portions 12a and 12b is about 3.0 mm, the inner diameter is about 1.2 mm, and the total length A is about 20 mm. The container 1 of the arc tube 1A is substantially surrounded by the middle tube 6.

  The electrode assemblies 2A and 2B have an outer diameter of about 0.6 mm and a length of about 8 mm of an electrode shaft 21 made of tungsten, and the coiled electrode 22 winds a tungsten wire having an outer diameter of about 0.2 mm at a dense pitch for about three turns. The distance between both electrodes is about 15 mm.

  The introduction conductors 23a and 23b are made of Nb, have an outer diameter of about 0.9 mm, a length of about 12 mm, and the coiled portions 25a and 25b wound with molybdenum wire have an outer diameter of about 0.9 mm and a length. Is about 12 mm.

As a discharge medium, about 53 kPa of argon as a starting and buffer gas, about 10 mg of mercury and a halide of NaI-TlI-InI-TmI ₃ at a ratio of about 30 wt%-about 15 wt%-about 5 wt%-about 50 wt% About 13 mg of Hg is enclosed.

  Further, the outer tube 5 is a BT type made of hard glass and has a maximum outer diameter of about 116 mm, a maximum inner diameter of about 114 mm (thickness of about 1.0 mm), a total length of about 250 mm (the total length including the base 6 is about 250 mm). .

For comparison with the above-described discharge lamp L1 (Examples 1 and 2), a discharge lamp having the same configuration other than the halide, such as the rating, dimensions, and materials, was prototyped. In Table 1, Comparative Example 1 is a metal halide similar to that described in Patent Document 1 described above. Sodium iodide NaI-thallium iodide TlI-iodine dysprosium DyI ₃ is about 30 wt% -about 15 wt% -about A lamp encapsulated at a rate of 55 wt%, and Comparative Example 2 is a halide used in a known lamp, which is sodium iodide NaI-thallium iodide TlI-cerium iodide CeI ₃ about 30 wt% -about 15 wt%- A lamp encapsulated at a ratio of about 55 wt%, and Comparative Example 3 is a lamp encapsulating sodium iodide NaI-thallium iodide TlI-thulium iodide TmI ₃ at a ratio of about 30 wt% -about 15 wt% -about 55 wt%. Comparative Example 4 is sodium iodide NaI-thallium iodide TlI-dysprosium iodide DyI ₃ -holmium iodide HoI-thulium iodide TmI ₃ is a lamp in which 3 is sealed at a ratio of about 30 wt% to about 10 wt% to about 20 wt% to about 20 wt% to about 20 wt%.

表１および表２から明らかなように、本発明の実施例１および実施例２のランプは、効率、相関色温度、色度偏差（ｄ．ｕ．ｖ）および平均演色評価数（演色性：Ｒａ）などの発光特性が目標とする範囲内に入り、また、寿命中の変化を含めて垂直（ＢＵ）点灯から傾斜点灯、水平（ＢＨ）点灯、傾斜点灯、垂直（ＢＤ）点灯などのどのような点灯方向においても発光特性の変化量が小さく、一般照明用として好適な白色光を放射できる。 Table 1 shows examples of various lamps related to the present invention described above and below, and Examples 1 to 4 and Table 2 shows examples of comparative various lamps described above and below for comparison. This is an average value obtained by measuring various light emission characteristics at the time of vertical (BU) lighting and horizontal (BH) lighting after lighting for 10 hours for each of the ten lamps.

As is apparent from Tables 1 and 2, the lamps of Examples 1 and 2 of the present invention have efficiency, correlated color temperature, chromaticity deviation (duv), and average color rendering index (color rendering properties: Ra) and other emission characteristics fall within the target range, and including changes during the lifetime, from vertical (BU) lighting to tilted lighting, horizontal (BH) lighting, tilted lighting, vertical (BD) lighting, etc. Even in such a lighting direction, the amount of change in light emission characteristics is small, and white light suitable for general illumination can be emitted.

In contrast, the lamp encapsulating DyI _{3 of} Comparative Example 1 has high efficiency and average value of color rendering index (color rendering property: Ra), but when this average color rendering index (color rendering property: Ra) exceeds 90, In the red region of the light emission distribution, there is a problem that the light emission of sodium halide or rare earth halide increases, the deviation from the specific visibility curve becomes large, and as a result, the light emission efficiency is lowered.

The lamp encapsulating CeI _{3 of} Comparative Example 2 has a high efficiency of about 120 Lm / W, but the average color rendering index (color rendering property: Ra) is as low as about 70 and the chromaticity deviation (duv.) Is high. Therefore, it emits a remarkable green light and is not suitable as a general illumination lamp.

Further, the lamp encapsulating TmI _{3 of} Comparative Example 3 has improved efficiency and has higher color rendering than Comparative Example 2, but emits green light, and thus has a chromaticity deviation (duv.) Of black body. It will deviate greatly from the radiation trajectory. Therefore, in the lamps of Examples 1 and 2 in which InI was added to the lamp of Comparative Example 3, the chromaticity deviation (duv.) Was improved without the emission color becoming green.

Further, the lamp encapsulating DyI ₃ , HoI, and TmI ₃ of Comparative Example 4 has high color rendering properties but reduced efficiency, and the chromaticity deviation (duv.) Is not as large as that of Comparative Example 2, but is positive. It is moving in the direction. However, since the chromaticity deviation (duv.) Moves greatly in the negative direction during the lifetime, the human eye feels uncomfortable with a large color change.

  In addition, compared with the rated power of 250 W in Examples 1 and 2, a similar discharge lamp having a rated power of 400 W, which is about 1.4 times the power, was prototyped. Various characteristics of this lamp are shown as Example 3. In the table, data on the life is not described, but the example and the comparative example are almost the same and are omitted.

  A lamp of the same type as in Example 1 with a rated power of 400 W was prototyped and various characteristics were measured.

  The arc tube 1A is made of translucent alumina ceramics, has a total length of about 80 mm, an outer diameter of the bulging portion 11 of about 22 mm, an inner diameter of about 20 mm, an inner volume of about 4.0 cc, and outer diameters of the small diameter cylindrical portions 12 a and 12 b of about 2. It is 0 mm and the inner diameter is about 1.6 mm.

  The electrode assemblies 2A and 2B have an outer diameter of about 1.0 mm and a length of about 8 mm of an electrode shaft 21 made of tungsten, and the coiled electrode 22 winds a tungsten wire having an outer diameter of about 0.3 mm at a dense pitch for about three turns. The distance between the electrodes is about 20 mm.

  The introduction conductors 23a and 23b are made of Nb, have an outer diameter of about 1.5 mm, a length of about 15 mm, and the coiled portions 25a and 25b wound with molybdenum wire have an outer diameter of about 1.4 mm and a length. Is about 18 mm.

As a discharge medium, about 53 kPa of argon as a starting and buffer gas, about 15 mg of mercury of NaI-TlI-InI-TmI ₃ halide at a ratio of about 30 wt% -about 15 wt% -about 5 wt% -about 50 wt% and mercury About 35 mg of Hg is enclosed.

  The outer tube 5 is a BT type made of quartz glass, has a maximum outer diameter of about 116 mm, a maximum inner diameter of about 114 mm (thickness of about 1.0 mm), and an overall length of about 300 mm. 6 is almost entirely enclosed.

  In the lamp of Example 3, as shown in Table 1, light emission characteristics such as efficiency, correlated color temperature, chromaticity deviation (duv.), And average color rendering index (color rendering property: Ra) are targeted. It was within the range and was able to emit white light suitable for general illumination.

Further, according to the present invention, the metal halide to be encapsulated is NaI, TlI, InI, and TmI ₃ , and InI is added to Example 1 above, and the weight ratio of InI to TmI ₃ among the above substances InI / TmI ₃ 5 wt% / 50 wt% = 0.1 and the weight ratio of InI to TlI InI / TlI is 5 wt% / 15 wt% = 0.33, thereby suppressing the correlated color temperature depending on the lamp lighting direction to 500 K or less. We were able to.

  That is, in addition to the effects of the first and second embodiments, the discharge lamp has a light emitting characteristic such as efficiency and color temperature by changing the coldest part temperature between the vertical state and the horizontal state and changing the vapor pressure of the halide. However, in the present invention, the color temperature variation of the lamp can be suppressed to 500K or less.

  A lamp of the same type as in Example 3 with a rated power of 400 W was prototyped and various characteristics were measured.

  The structure and dimensions of the arc tube 1A, the electrodes 2A and 2B, the introduction conductors 23a and 23b, and the outer tube 5 are the same as those in Example 3, but the composition of the metal halide as the discharge medium sealed in the arc tube 1A is the same. It differs from Examples 1-3.

That is, the lamp L1 of the fourth embodiment, the halide of _{NaI-TlI-InI-TmI 3} , further at least one of Ce or Pr, wherein the halide is enclosed containing PrI ₃ is.

The NaI-TlI-InI-TmI ₃ weight ratio of the halide consisting -pri ₃ is about 29 wt% - are about 15mg in an amount of about 19 wt% encapsulated - about 10 wt% - about 2 wt% - about 40 wt%.

  In the lamp of Example 4, as shown in Table 1, light emission characteristics such as efficiency, correlated color temperature, chromaticity deviation (duv.), And average color rendering index (color rendering property: Ra) are targeted. It was within the range and was able to emit white light suitable for general illumination.

Lamp of this Example 4, NaI-TlI-InI-TmI 3 of Yes was added to PrI ₃ to about 19 wt% halides, compared to lamp filled only _{NaI-TlI-InI-TmI 3} , further High luminous efficiency could be obtained.

Incidentally, the halide be combined both the PrI ₃ in varied CeI ₃ also or PrI ₃ by adding, CeI ₃ added less than 20 wt%, the same effects as described above were obtained.

  In the high-pressure discharge lamps L1 of the first to fourth embodiments according to the present invention, as shown in FIG. 4, the chromaticity at the time of vertical (BU) lighting and horizontal (BH) lighting is expressed by xy chromaticity coordinates ( When plotted on CIE 1931), the chromaticity deviations (duv.) Of all lamps L1 are in the range of −0.0050 to +0.0100.

  In general, in the case of lamps filled with sodium halide, when the lighting direction is changed from vertical to horizontal, the arc tube temperature rises, so that the emission of sodium spreads, the correlated color temperature decreases, and the chromaticity deviation ( duv.) changes in the negative direction, but the lamp L1 of the present invention has a chromaticity deviation (duv.) of −0.0050 to +0.0100 due to the combined effect of thulium halide and indium halide. Exists in the range.

  Table 3 shows the correlated color temperature (CCT (K)) and chromaticity deviation (duv) when the lamps of Examples 1 to 4 and Comparative Examples 1 to 4 are vertically (BU) lit and horizontally (BH) lit. .)). FIG. 4 is a graph created based on Tables 1 and 2, and is a chromaticity diagram in which the horizontal axis represents chromaticity coordinates x and the vertical axis represents chromaticity coordinates y.

この表１，２および図４から明らかなように本発明の実施例の高圧放電ランプは、相関色温度（ＣＣＴ）が３５００〜５０００Ｋで、色度偏差（ｄｕｖ．）が、−０．００５０〜＋０．０１０の範囲内にあり、点灯方向による偏差の小さい安定した色度などの色特性が得られる効果を奏する。これに対し、比較用とした高圧放電ランプは、色度偏差（ｄｕｖ．）が、−０．００５０〜＋０．０１０の範囲内にあるが、その色度偏差（ｄｕｖ．）が大きかった。 In FIG. 4, the ◯ mark is an example, the □ mark is a comparative example, the numbers are respective example numbers, the blank mark is vertical (BU) lighting, and the black mark is chromaticity when horizontal (BH) lighting is the same lamp. There is a straight line between them.

As is apparent from Tables 1 and 2 and FIG. 4, the high-pressure discharge lamp of the example of the present invention has a correlated color temperature (CCT) of 3500 to 5000 K and a chromaticity deviation (duv.) Of −0.0050 to It is within the range of +0.010, and there is an effect that color characteristics such as stable chromaticity with a small deviation depending on the lighting direction can be obtained. On the other hand, the high pressure discharge lamp for comparison had a chromaticity deviation (duv.) In the range of −0.0050 to +0.010, but the chromaticity deviation (duv.) Was large.

Further, the relationship between the amount M (mg) of metal halide sealed in the arc tube 1A and the space volume V (mm ³ ) in at least one of the small-diameter cylindrical portions 12a and 12b at the end of the arc tube 1A M / It has been found that by regulating V and the tube wall load (lamp power (W) per unit inner surface area (cm ² ) of the discharge space portion), the effect of suppressing the change in color characteristics is exhibited.

That is, the relationship M / V between the amount of metal halide enclosed M (mg) and the space volume V (mm ³ ) in the small-diameter cylindrical portions 12a and 12b at the end of the arc tube 1A is the small-diameter cylindrical portion 12a. , 12b, the metal halide filling rate in the space (gap between the small diameter cylindrical portions 12a, 12b and the introduction conductors 23a, 23b) is equivalently shown, and the value of M / V is small. This means that the amount of metal halide enclosed M is small or the space volume V in the small-diameter cylindrical portions 12a and 12b is large. There is a risk that the temperature of the section changes greatly, and the change of the color characteristic of the lamp increases accordingly, and the minimum M / V value is about 0.2.

On the other hand, when the value of M / V is large, the amount of metal halide enclosed M is too large, or the space volume V in the small-diameter cylindrical portions 12a, 12b is small. When the amount of encapsulated M is large, the amount of impurities such as H ₂ O is increased, which causes problems such as an increase in starting voltage or blackening of the container, resulting in a rapid decrease in luminous flux. The value of was preferably in the range of about 0.2 to 5.0 in consideration of variations and the like.

Further, with respect to the tube wall load (lamp electric power (W) per unit inner surface area (cm ² ) of the discharge space portion), the above results were obtained in the range of about 12 to 35 W / cm ² .

Therefore, the relationship M / V between the enclosed amount M (mg) of the metal halide and the space volume V (mm ³ ) in at least one small-diameter cylindrical portion is 0.2 or more, and the tube wall load (cm ^2). ) Per lamp power (W) of 12 to 35 W / cm ² , the above-described effects are achieved.

  Further, the high-pressure discharge lamp L1 having the small-diameter cylindrical portions 12a and 12b at the end of the arc tube 1A having the illustrated configuration has a small-diameter cylindrical shape from the inner end facing the discharge space side of the small-diameter cylindrical portions 12a and 12b when the lamp is turned on. It has been found that satisfactory emission characteristics can be obtained when the metal halide is present within a range of ½ of the total length of the portions 12a and 12b.

  That is, when the lighting direction of the lamp L1 changes, the metal halide moves and the coldest part temperature changes and affects the color characteristics such as the correlated color temperature and the average color rendering index, but the small diameter at the end of the arc tube 1A. If the presence of the liquid phase metal halide can be confirmed within the half of the overall length of the small-diameter cylindrical portions 12a, 12b from the inner end side facing the discharge space of the cylindrical portions 12a, 12b, the lighting direction when the lamp L1 is lit Regardless of, it exhibits stable color characteristics.

  In addition, the presence of the metal halide can be easily confirmed by visual discrimination through a light shielding body or the like. The fact that no metal halide is found in the small-diameter cylindrical portions 12a and 12b indicates that the enclosed amount is insufficient, and desired light emission characteristics may not be obtained.

  In addition, in the case of arc tube 1A-1C of the structure shown to the said FIG. 3 (a)-(c), what is 1/2 range from the inner end which faces the discharge vessel 1 side of the small diameter cylindrical part 12a (12b)? A / 2 of the full-length A of the small-diameter cylindrical portion 12a (12b) is divided into two, and the presence of a metal halide may be recognized within A / 2 of the small-diameter cylindrical portion 12a (12b).

  5 and 6 repeat the cycle of vertical (BU) lighting 5.5 hours-lighting-off 0.5 hours using the lamp L1 of the first embodiment related to the present invention and the lamp of the conventional comparative example 3, It is the graph which measured the change (FIG. 6) of the correlation color temperature (K) with the progress of a lifetime (FIG. 6), and the change (FIG. 7) of chromaticity deviation (duv.).

  In FIG. 5, the horizontal axis indicates the lifetime (time), and the vertical axis indicates the correlated color temperature (K). In FIG. 6, the horizontal axis indicates the lifetime (time), and the vertical axis indicates the chromaticity deviation ( duv.).

  As is clear from the figure, the change in the color temperature (K) shows that the lamp L1 of Example 1 according to the present invention is approximately 200K lower than the lamp of Comparative Example 3 over the lifetime, but shows almost the same maintenance characteristics. It was.

  Further, the chromaticity deviation (duv.) Of the lamp L1 of Example 1 according to the present invention has a small chromaticity deviation over the lifetime, whereas the lamp of Comparative Example 3 has a chromaticity deviation over the lifetime. It was confirmed that the lamp L1 of Example 1 according to the present invention was excellent in color characteristics such as correlated color temperature and chromaticity deviation.

  7 and 8 are front views showing other embodiments of the high-pressure discharge lamps L2 and L3 of the present invention. In the figure, the same parts as those of the discharge lamp L1 shown in FIGS. A description thereof will be omitted.

  The high-pressure discharge lamp L2 shown in FIG. 7 has a lamp rated power of 280 to 440 W, for example, 400 W, and the outer tube 5 that houses the arc tube 1A shown in FIG. 2 has a BT shape. The stem 4s of the mount is sealed at a portion (not shown), and the arc tube 1A is connected and supported by the power supply lines 42a and 42b of the pair of power supply members 4A and 4B provided on the stem 4s.

More specifically, the outer tube 5 has a thermal expansion coefficient of about 35 × 10 ⁻⁷ / ° C. to about 60 × 10 ⁻⁷ / ° C. and a maximum outer diameter of about 65 mm made of hard glass having a strain point of 500 ° C. or less. An arc tube 1A having a discharge vessel 1 having a total length of about 250 mm and having a maximum outer diameter of about 22 mm and a total length of about 80 mm made of a translucent ceramic having the same shape as that shown in FIG. The middle tube 3 provided surrounding the arc tube 1A is not essential, but when provided, it is preferable to dispose a gap of 2 mm or more from the outer surface of the arc tube 1A.

  In the present invention, even in the case of the structure in which the shape of the outer tube 5 is changed in this way, the various light emission characteristics are the same as those of the lamp L1 of the above-described embodiment, and the same operational effects are exhibited. In addition, the lamp L2 of this embodiment can obtain desired light emission characteristics, and the surface temperature of the outer tube 5 can be lowered during lighting in the fixture, so that the lamp L2 itself and a lighting fixture that accommodates the lamp L2 can be made compact. There are advantages.

  Further, the high-pressure discharge lamp L3 shown in FIG. 8 has a T (straight tube) shape in which the outer tube 5 that accommodates the arc tube 1A shown in FIG. 2 is made of quartz glass, and the introduction conductor 23a led out from the arc tube 1A at both ends. , 23b and molybdenum foils 52, 52 connected to the airtightly sealed structure 51, 51, and various light emission characteristics exhibit the same effects as the lamp L1 of the above embodiment.

  FIG. 9 is a partial cross-sectional front view showing a lighting device 8 according to the present invention in which, for example, the high-pressure discharge lamp L1 is used. This illuminating device 8 is an embedded illuminating device that is embedded in a ceiling 91, and has an appliance (device) main body 92 attached to the ceiling 91, and a socket 93 provided in the appliance (device) main body 92. The base 6 of the high-pressure discharge lamp L1 is attached. In addition, a reflection mirror 94 that reflects the emitted light of the lamp L1 downward is disposed in the instrument (device) main body 92. The opening side of the reflection mirror 94 is covered with a cover member or a lens made of glass or the like. A light control body 95 is provided.

  The high-pressure discharge lamp L1 is electrically connected to an appliance (device) main body 92 or a lighting device having a ballast arranged separately from the main body 92, and is lit by power supplied from the lighting device. Can do.

  The present invention is not limited to the above-described embodiment, and for example, in a discharge lamp having a lamp power of 10 to 1000 W class, the same effects as those of the above-described embodiment are obtained. Moreover, in the said embodiment, although the obstruction | occlusion structure of arc tube 1A-1C was shown to the said FIG. 3 (a)-(c), it is not restricted to the form using the adhesive agent of FIG. It may be occluded by a method such as squeezing with a solid object or plug-like body.

  Although iodine I was used as the halogen element of the halide, the present invention may be other halogen elements such as bromine Br, chlorine Cl and fluorine F, and is composed of a plurality of types of halogen elements. It doesn't matter.

  The lighting device is not limited to the above embodiment, and may have other structures and uses. The lighting method is not limited to the one using the rectangular wave lighting circuit device, and the choke coil type, the transformer type, etc. A magnetic excitation type ballast may be used.

It is a schematic front view which shows embodiment of the high pressure discharge lamp of this invention. It is an expanded sectional front view which shows the arc_tube | light_emitting_tube part in FIG. Drawing (a)-(c) is the longitudinal section front view showing typically the one end part side of the arc tube which carried out various structures. In the graph of xy chromaticity coordinates (CIE 1931) in which the chromaticity according to the lighting direction of the high-pressure discharge lamp of the present invention is compared, the horizontal axis indicates the x chromaticity and the vertical axis indicates the y chromaticity. It is the graph which measured the change of correlation color temperature (K) with the lifetime progress by repeating the cycle of lighting-off using the lamp L1 of the said Example 1 related to this invention, and the lamp | ramp of the conventional comparative example 3. FIG. . The graph which measured the change of the chromaticity deviation (duv.) With a lifetime progress, using the lamp L1 of the said Example 1 related to this invention and the lamp | ramp of the conventional comparative example 3, repeating the cycle of lighting-off. is there. It is a schematic front view which shows other embodiment of the high pressure discharge lamp of this invention. It is a schematic front view which shows other embodiment of the high pressure discharge lamp of this invention. It is a partial cross section front view which shows embodiment of the illuminating device of this invention.

Explanation of symbols

L1 to L3: high pressure discharge lamp (metal halide lamp),
1A to 1D: arc tube, 1: discharge vessel, 11: bulging part, 12a, 12b: small diameter cylindrical part, 2A, 2B: electrode assembly, 23a, 23b: introduction conductor, 4A, 4B: feeding member, 8: Lighting device 82: Instrument (device) body,

Claims (4)

A translucent ceramic discharge vessel having a pair of small-diameter cylindrical portions having an inner diameter smaller than the bulge portions provided at both ends of the bulge portion forming the discharge space, and hermetically sealed in each small-diameter cylindrical portion of the discharge vessel. A pair of electrode assemblies connected to the introduction conductor and extending into the small-diameter cylindrical portion and having the tip facing the bulging portion, and Na, Tl, In, and Tm sealed in the discharge vessel An arc tube comprising a metal halide having a total halide content of 90% by weight or more and a discharge medium containing a starting gas;
An outer tube having the arc tube disposed therein along the tube axis and hermetically closed;
It is sealed at the end of the outer tube, is electrically connected to the lead-in conductor of the arc tube, and has a pair of power supply members that hold the arc tube, and has a correlated color temperature of 3500 to 5000 K, an average color rendering In a discharge lamp that emits radiated light having an evaluation number (Ra) of 75 to 90 and an efficiency of 90 to 120 lm / W,
The relationship between the amount M (mg) of metal halide enclosed in the arc tube and the space volume V (mm ³ ) in the small-diameter cylindrical portion at the end of the arc tube, M / V is 0.2 or more, and Tm halide 20 to 70 wt% of the encapsulated total ratio of metal halide, and a wall loading is 12~35W / cm ^2, x-y chromaticity coordinates of the entire lighting direction in lamp life (CIE 1931) A high pressure discharge lamp characterized in that the chromaticity deviation (duv.) Above is in the range of -0.006 to +0.010, preferably -0.003 to +0.007. The metal halide is present in a range of ½ of the entire length of the small-diameter cylindrical portion from the inner end facing the discharge space of the small-diameter cylindrical portion at the end of the arc tube when the lamp is turned on. high-pressure discharge lamp according to 1. The high-pressure discharge lamp according to claim 1 or 2 , which operates at a rated power of 10 to 1000 W and has a color temperature fluctuation value of 500 K or less during vertical lighting and horizontal lighting. A lighting device body;
A high-pressure discharge lamp according to any one of claims 1 to 3 provided in the lighting device body;
Lighting circuit means for lighting this high pressure discharge lamp;
An illumination device comprising:

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