JP2010272435A - High-voltage discharge lamp and lighting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high-voltage discharge lamp having a superior luminescence property such as a color rendering property, specifically, a superior red color rendering index R9, and also to provide a lighting device equipped with the same. <P>SOLUTION: The high-voltage discharge lamp L1 is equipped with: a luminous tube 4 which is constituted so that a discharge medium composed of a light-emitting material and a noble gas is encapsulated in an airtight container 21; a housing 1 that surrounds the luminous tube 4; and a visible light selection and absorption film 6 that is formed on the surface of the housing 1 and is composed of a mixture of fine particles of an aluminum cobalt oxide, fine particles of gold, and a silicon compound as chief materials. The high-voltage discharge lamp L1 is lit at a color temperature of 3,600 to 4,200 K, a color deviation duv of 0 to -0.005, and an average color rendering index Ra and a red color rendering index R9 of 90 or higher. The lighting device 9 is equipped with the high-voltage discharge lamp L1. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a high-pressure discharge lamp and an illuminating device having improved light emission characteristics.

  High-pressure discharge lamps are widely used as lighting sources for stores, factories, halls, sports facilities, etc. as a light source with high efficiency, high color rendering properties and long life.

  For example, a high pressure discharge lamp used for lighting an exhibition product in a store or the like generally has a color temperature of 3600 to 4200 K and a relatively high average color rendering index Ra, but a red color rendering index R9 is generally + (plus). Even if it is good on the side, it is around 60, and the appearance of red color is poor in foods and clothing, and it is not suitable for lighting these products.

  Therefore, a filter film made of an optical interference film or the like is formed on the surface of the outer tube surrounding the arc tube or the arc tube to reduce the light output on the short wavelength side in the visible light region and lower the color temperature. High pressure discharge lamps have been developed that maintain the evaluation number Ra or maintain the red color rendering evaluation number R9 to improve the appearance of red.

  However, this high-pressure discharge lamp has a filter film formed on the surface of an arc tube using quartz glass in a multi-tube structure. There was also a problem in workability such that the deterioration of the light emission characteristics occurred quickly due to early deterioration and the film formation operation had to be performed at a high temperature.

  The present invention has been made in view of the above problems, and recently, containers made of ceramics such as alumina having excellent heat resistance and chemical resistance have been used, and various light emission characteristics can be improved and miniaturized. A high pressure discharge lamp suitable for a discharge lamp using an arc tube that has been developed, and excellent in light emission characteristics such as color rendering, particularly in a red color rendering index R9, and improved in productivity such as quality and workability, and An object is to provide a lighting device.

  A high-pressure discharge lamp according to claim 1 of the present invention includes an arc tube in which a discharge medium composed of a luminescent material and a rare gas is sealed in an airtight container; an envelope that surrounds the arc tube; A visible light selective absorption film formed by mixing cobalt aluminum oxide fine particles, gold fine particles and silicon-based compounds as main materials on the surface; color temperature 3600-4200K, color deviation duv0--0.005, average color rendering evaluation Lights when the number Ra and the color rendering index R9 are 90 or more.

  The high-pressure discharge lamp of the present invention having the above-described configuration is a cobalt aluminum oxide fine particle having an absorption peak near 600 nm on the inner or outer surface of an envelope such as an inner tube or an outer tube surrounding the arc tube, and absorbs near 530-540 nm. By forming a visible light selective absorption film mainly composed of gold fine particles having a peak and a silicon-based compound, it is possible to reduce yellow light, reduce yellowness, and control color deviation duv while improving color rendering. An enabled high-pressure discharge lamp can be obtained.

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

  [About the arc tube] In the present invention, the arc tube is an airtight container formed of a material made of hard glass such as heat-resistant translucent ceramics or quartz glass, and at least a pair of electrodes and a current that supports and feeds the electrodes. An introduction conductor and a discharge medium are provided. In particular, when a ceramic container is used, it can be made small and highly efficient.

  The heat-resistant and light-transmitting airtight container can have various shapes such as a cylindrical shape (T shape), a spherical shape (G shape, etc.), an elliptic sphere (a composite shape such as T shape or G shape), and its internal volume. That is, the volume of the discharge space can be set to various values according to the magnitude of the rated lamp power of the high pressure discharge lamp.

  [Regarding Electrode] At least a pair of electrodes are sealed in the light-transmitting airtight container, and the tips are separated from each other and face the discharge space. The electrode can be formed using a refractory metal such as tungsten (W), doped tungsten, rhenium (Re), rhenium-tungsten alloy (Re-W), or molybdenum (Mo).

  In addition, the electrode is a portion that is disposed at the tip of the electrode shaft and acts as a cathode or an anode. The electrode shaft may also serve as the electrode, but it is necessary to increase the surface area to improve heat dissipation. For example, a tungsten wire coil can be wound.

  [Regarding Discharge Medium] The discharge medium is composed of a luminescent metal and a rare gas for starting, and can preferably include a lamp voltage forming substance. Examples of the luminescent metal include metals such as mercury (Hg), sodium (Na), scandium (Sc), yttrium (Y), indium (In), thallium (Tl), tin (Sn), cerium (Ce), praseodymium ( There are known rare earth metals such as Pr), dysprosium (Dy), holmium (Ho), thulium (Tm), etc., and these metals can be used by selecting one or more kinds according to the lamp characteristics.

  Further, these metals can be enclosed in the arc tube as a halide with iodine (I), bromine (Br), chlorine (Cl), fluorine (F), or the like.

  The noble gas contributes to starting discharge at least when starting the high-pressure discharge lamp. However, the specific gas type is not limited. In the case of a high-pressure discharge lamp for general illumination, argon (Ar) gas is preferably used, but a mixed gas of argon (Ar) and neon (Ne) or the like may be used.

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

  [Envelope] An envelope is an outer tube that seals the arc tube in the case of a double tube structure, and an inner tube that seals the arc tube in the case of a triple tube structure and an outer tube that accommodates the inner tube. When the arc tube provided to surround the tube or arc tube is broken, it refers to an inner tube (shroud) that prevents scattering of fragments and an outer tube that accommodates the inner tube. In the case of a reflection type container such as a PAR type, a front lens that emits light and a reflector portion connected to the lens are referred to as an outer tube (envelope).

  The mode in which the arc tube and the inner tube are built in may be either airtight or communicating with the outside. In addition, the outer tube (envelope) accommodates starting components such as an ultraviolet ray source, a high-voltage pulse generator, or a proximity conductor in a predetermined position inside the arc tube as required for starting the arc tube. can do.

  The material of the inner tube is not particularly limited, such as quartz glass, borosilicate glass, aluminosilicate glass, or soda lime glass. Further, since the inner tube is covered with the outer tube, it is not directly touched with a finger, and the inner tube is not soiled. As a high-pressure discharge lamp for general illumination, the inside of an inner tube is generally set to a vacuum or an inert gas (for example, nitrogen (N) or argon (Ar)) atmosphere.

  The outer tube accommodates an inner tube and an inner tube (shroud) in the inner tube, and protects these members from mechanical damage and fouling by a finger. The material of the outer tube is not particularly limited. For example, it can be formed of hard glass, semi-hard glass or soft glass. Further, as the outer tube, various types of tubes such as a T shape, a BT shape, an R shape, or a partial combination of these shapes can be appropriately selected and employed as desired.

  [Visible Light Selective Absorbing Film] As a material for forming the coating film, a material mainly composed of cobalt aluminum oxide fine particles having a particle size of 30 to 200 nm, gold fine particles having a particle size of 5 to 30 nm, and a silicon compound is used. This coating has cobalt aluminum fine particles with an absorption peak around 600 nm and gold fine particles with an absorption peak around 530 to 540 nm, thereby reducing yellow light and reducing yellowness, and color rendering. Controls the color deviation duv.

  The coating is formed on either the inner or outer surface of the light-transmitting front cover member of an envelope such as an inner tube or an inner tube that surrounds the arc tube, or an outer tube that houses these tubes, or an illuminating device (tool). be able to.

  Further, the film thickness is preferably 1 to 10 μm, and if it is less than 1 μm, it is necessary to increase the concentration of the organic compound having absorption, which adversely affects optical properties such as a decrease in transmittance, and if it exceeds 10 μm, the film strength is decreased. However, there are problems such that the transmittance is likely to fluctuate and the cost is increased due to an increase in the amount of material used.

[About the base] The base is a lamp component that holds the main body of the high-pressure discharge lamp in the socket and functions to electrically connect to the power source. In the present invention, the base is a screw-in type (such as E type) or a plug-in type (G And various other known structures such as a pinless insertion type and a bipost type base can be employed.

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

  The high-pressure discharge lamp according to claim 2 of the present invention is characterized in that the visible light selective absorption film is formed to contain at least one of zinc oxide, aluminum oxide, silicon oxide, and yttrium oxide.

  In addition to the effects of the first aspect, by adding the above materials, it is possible to easily adjust the film thickness and transmittance, and obtain a high-pressure discharge lamp with improved coating strength.

  A high-pressure discharge lamp according to claim 3 of the present invention includes an arc tube in which a discharge medium composed of a luminescent material and a rare gas is sealed in an airtight container; an envelope that surrounds the arc tube; A visible light selective absorption film formed by adding cobalt aluminum oxide fine particles, gold fine particles and a silicon-based compound as main materials on the surface, and adding and mixing iron oxide thereto, and having a color temperature of 3200 to 3600 K and a color deviation of duv0 -0.005, average color rendering index Ra and red color rendering index R9 are turned on when 90 or more.

  The color temperature can be easily adjusted by adding and mixing iron oxide to the coating material. This lamp can lower the color temperature as compared with the lamp of claim 1 and can provide a high-pressure discharge lamp that reduces yellow light, reduces yellowness, and controls color rendering and color deviation duv.

  Further, in this lamp, zinc oxide, aluminum oxide, silicon oxide, yttrium oxide, or the like may be added to the coating material to form a coating, and this addition can also achieve the effects described in claim 2.

  According to a fourth aspect of the present invention, there is provided an illuminating device comprising: an instrument main body; a high-pressure discharge lamp mounted on a socket disposed in the instrument main body; and a transparent member provided so as to close an opening of the instrument main body. A light-sensitive front cover member; and a visible light selective absorption film formed by mixing cobalt aluminum oxide fine particles, gold fine particles and a silicon compound as main materials on the surface of the light-transmitting front cover member; 4200K, color deviation duv0 to -0.005, average color rendering index Ra and red color rendering index R9 are 90 or more, and light irradiation is performed.

  The lighting device of the present invention has an absorption peak near 600 nm on the surface of the translucent front cover member provided so as to close the opening of the instrument body, and has an absorption peak near 530-540 nm. It is possible to obtain an illuminating device that reduces the yellow light of the light transmitted through the translucent front cover member, reduces yellowness, and exhibits predetermined light emission characteristics that control color rendering and color deviation duv.

  In addition, the visible light selective absorption film formed on the surface of the translucent front cover member of the lighting device may be a film to which the material according to claim 2 or 3 is added. The effects described in 2 or 3 are also exhibited.

  The lighting device may be provided with a lighting circuit device in the fixture body, or may be provided with a lighting circuit device outside the main body and connected to a discharge lamp. A lens or a translucent front cover member may be provided on the radiation side. Moreover, the said illuminating device may be called a lighting fixture.

  According to the invention of claim 1, red light emission is corrected, the average color rendering index Ra and the red color rendering index R9 show high color rendering properties of 90 or more, and the color deviation duv can be controlled and changed to the minus side. Therefore, it is possible to provide a high-pressure discharge lamp suitable for illuminating a product mainly including warm red, such as food and clothing.

  According to the invention of claim 2, it is possible to provide a high-pressure discharge lamp which is further excellent in light emission characteristics and film strength in the lamp of claim 1 described above.

  According to the invention of claim 3, there is provided a high-pressure discharge lamp that can easily adjust the color temperature and has the same effect as that of claim 1 in a lamp having a color temperature lower than that of the lamp of claim 1. can do.

  According to the fourth aspect of the present invention, the illumination device corrects red light emission, exhibits high color rendering properties with an average color rendering index Ra and a red color rendering index R9 of 90 or more, and has a color deviation duv on the negative side. A lighting device (equipment) that is highly effective for lighting of color products such as fresh fish, meat, fruits, vegetables, and fresh flowers, lighting of clothing such as clothing stores, or lighting of household dining tables, etc. Can be provided.

It is a partial cross section front view which shows 1st Embodiment of the high pressure discharge lamp of this invention. It is a graph which shows the relative energy distribution of a high pressure discharge lamp. It is a front view which shows 3rd Embodiment of the high voltage | pressure discharge lamp (reflection type) of this invention. It is a partial cross section front view which shows embodiment of the illuminating device (instrument) of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a partial cross-sectional front view showing a first embodiment for implementing a high-pressure discharge lamp of the present invention.

  The high-pressure discharge lamp L1 of this embodiment has a rated lamp power of 70 W, for example, and is formed on the surfaces of the outer tube 1 and the inner tube 2, the arc tube 4, the base 5 and the outer tube 1 forming a double envelope. It is composed of a triple tube having a selective absorption film 6 or the like as a main member.

  The outer tube 1 forming the outer envelope is formed of a T-shaped bulb having a bottomed cylindrical shape with a closed end made of hard glass, and the end surface of the base end portion 11 is an open opening. Yes. The outer tube 1 is made of a glass tube having a wall thickness of about 2 mm, an outer diameter of about 20 mm, and a length (including a clogging portion at the top of the head) of about 75 mm.

  The inner tube 2 forming the inner envelope is composed of an airtight container 21 made of quartz glass having a wall thickness of about 1.5 mm, an outer diameter of about 15 mm, and a length (including a pinch seal portion) of about 60 mm. An exhaust tip off portion 22 is formed at the center of the closed tip portion.

  A pinch seal portion 23 is formed at the base end portion. A pair of metal foils 24 and 24 made of molybdenum (Mo) or the like are embedded in the pinch seal portion 23 in an airtight manner in parallel, and an internal introduction line 25 and an external introduction are provided at both ends of each metal foil 24 to be sealed. Line 26 is connected. Note that one or a plurality of protrusions may be formed on both flat surfaces of the pinch seal portion 23 across the flat surface.

  In the present embodiment, the inner tube 2 has a support member 31 that supports the arc tube 4 and the like in addition to the arc tube 4 (the internal lead wire 25 may be extended). In addition, an ultraviolet light source 32 such as a UV enhancer and a getter 33 are disposed.

  The arc tube 4 has a small-diameter cylindrical portion as a pair of sealing bodies 42 and 42 in communication with the hermetic container 41 at a portion facing the hermetic container 41 having a substantially spherical shape made of translucent polycrystalline alumina ceramics. Current introduction conductors 43 and 43 are sealed in the small-diameter cylindrical portion, and discharge electrodes (not shown) are provided at the tips of the introduction conductors 43 and 43 so as to protrude into the airtight container 41 forming a discharge space. The configuration is as follows.

  The hermetic vessel 41 is filled with a discharge medium made of a luminescent metal halide, mercury, and starting gas. As the luminescent metal, for example, a metal halide selected from the group of rare earth metals such as sodium (Na), indium (In), thallium (Tl) and thulium (Tm) is used as a starting gas. Is filled with argon (Ar) or the like.

  As shown in FIG. 1, the support member 31 may be formed by integrally extending the internal lead-in wire 25, and one internal lead-in wire 25 is a current derived from the sealing body 42 below the arc tube 4. The other inner lead-in wire 25 is welded to the lead-in conductor 43, extends along the tube axis direction at a position close to the inner wall of the air-tight container 21 of the inner tube 2, is bent near the tip of the air-tight container 21, and emits light. The arc tube 4 is fixedly supported on the tube axis by being led out from the sealing body 42 at the upper part of the tube 4 and welded to the current introduction conductor 43 inserted into the exhaust tip-off portion 22 of the inner tube 2. ing.

  The base 5 has a base body 51 formed of a steatite molded body in which an inner pipe fixing part 52, an outer pipe fixing part 53 and a power receiving part insulator 54 are integrally formed. The power receiving part insulator 54 includes a power receiving part. Is provided. Each of the power reception units includes a shell 55a having a thread groove formed on the outer periphery made of a conductive metal, and an eyelet terminal 55b disposed at the center tip of the power reception unit insulator 54.

  The inner tube fixing portion 52 is formed of a long rectangular recess into which the pinch seal portion 23 of the inner tube 2 is inserted at the center of the base body 51, and the outer tube fixing portion 53 is an annular shape of the base body 51. It consists of an annular groove into which the base end portion 13 of the outer tube 1 formed concentrically inside the peripheral wall is inserted.

  The pinch seal portion 23 of the inner tube 2 inserted into the inner tube fixing portion 52 and the outer tube 1 inserted into the outer tube fixing portion 53 are adhesives 56 injected into the fixing portions 52 and 53. Are fixed by joining. The adhesive 56 is not particularly limited as long as it can withstand the operating temperature during lighting of the high-pressure discharge lamp. In general, however, an inorganic heat-resistant adhesive such as ceramics such as heat-resistant alumina is preferable. It may be fixed by mechanical means without using.

  In addition, a lead wire (not shown) connected to one of the external lead-in wires 26, 26 inserted through the center hole (not shown) of the power receiving portion insulator 54 of the base 51 is connected to the shell 55a and the other. A lead wire (not shown) is connected to the eyelet terminal 55b by means such as brazing or welding.

The visible selective absorption film 6 formed on the outer surface of the outer tube 1 is made of cobalt aluminum oxide (CoAl ₂ O ₄ or CoO.Al ₂ O ₃ ) fine particles having a particle size of 30 to ₂₀₀ nm, and gold having a particle size of 5 to 30 nm. (Au) Fine particles and silicon (Si) -based compounds are formed as main materials.

  The coating 6 is formed by, for example, about 30 wt% of silicon (silicone) resin having a heat resistant temperature of about 325 ° C. with respect to 1-methoxy-2-propanol and about 4 wt% of cobalt aluminum oxide with respect to silicon (silicone) resin. A coating liquid prepared by mixing fine particles (particle size is about 80 nm) and gold (Au) fine particles (particle size is about 10 nm) of about 0.5 wt% is prepared.

  Next, after immersing the outer tube 1 in this coating solution and pulling it up at a constant speed, the coating film adhering to the outer surface of the outer tube 1 is naturally dried, and when the coating film is dried, By performing a heat treatment for about 1 hour, a film 6 having a thickness of about 2 μm is obtained. This film thickness can be obtained by selecting the coating solution concentration, the pulling speed, the number of immersions, and the like.

  The high-pressure discharge lamp L1 shown in the present embodiment having the above-described configuration is a triple-layered metal halide lamp L1 in which the inner tube 2 in which the arc tube 4 is sealed is further accommodated in a T-shaped outer tube 1, for example, the base body 5 side is Lights up vertically, horizontally, or tilted down.

  The light emission characteristics of the high-pressure discharge lamp are such that the color temperature is about 3600 to 4200 K and the color deviation duv is about −0.002 to +0.004 in the state where the outer selective tube 6 is not formed on the outer tube 1. The average color rendering index Ra is 85 or more, the red color rendering index R9 is about 60 to 80, for example, the color temperature is about 3728K, the color deviation duv is about +0.0002, the average color rendering index Ra is about 95, and the red color rendering index R9 is While light is emitted at about 78, after the visible selective absorption film 6 mainly composed of cobalt aluminum oxide, gold and silicon oxide is formed on the outer surface of the outer tube 1 of the lamp L1, the color temperature is about Light is emitted at 3735K, a color deviation duv of about −0.0049, an average color rendering index Ra of about 96, and a red color rendering index of R9 of about 99.

In the present invention, the material for forming the visible selective absorption film 6 is not limited to the above-described cobalt aluminum oxide fine particles, gold fine particles, and silicon-based integrated materials, but includes iron oxide (for example, Fe ₂ O ₃ ). May be added. The high-pressure discharge lamp L2 shown in the second embodiment to which this iron oxide is added has the operational effects such as easy adjustment of the color temperature and increased correction of red light emission.

Incidentally, the outer tube 5 is immersed in a coating solution in which about 1 to 10 wt% of fine particles of iron oxide (for example, Fe ₂ O ₃ ) (particle size is about 30 to 100 nm) is further added to the film forming material shown in the above embodiment. Thus, the lamp L2 on which the visible selective absorption film 6 is formed can obtain light emission characteristics such as a desired average color rendering index Ra, a red color rendering index R9, and a color deviation at a lower color temperature than the lamp of the above embodiment. It was.

Further, the materials mainly composed of the cobalt aluminum oxide fine particles, the gold fine particles, and the silicon compound include zinc oxide (for example, ZnO), aluminum oxide (for example, Al ₂ O ₃ ), silicon oxide (for example, SiO ₂ ), yttrium oxide (for example, Y). ₂ O ₃ ) may be added to and mixed with at least one oxide fine particle selected from about 10 to 50 wt% with respect to the solution, and this addition can adjust the film thickness and transmittance. The coating strength was improved.

FIG. 2 shows the high-pressure discharge lamp L1 (solid line) of the present invention in which the coating 6 is formed on the outer surface of the outer tube 1 using the material mainly composed of the cobalt aluminum oxide fine particles, the gold fine particles and the silicon compound, and the material is further oxidized. The high-pressure discharge lamp L2 (one-dot chain line) of the present invention in which the film 6 is formed using a material added with iron (for example, Fe ₂ O ₃ ), and the high-pressure discharge lamp L (dotted line) without the film 6 before forming the film 6 In the graph, the horizontal axis indicates the wavelength (nm), and the vertical axis indicates the relative energy distribution (radiant energy intensity).

  FIG. 2 is a graph showing the light colors of the lamps L1, L2, and L in comparison. The average color rendering index Ra can be improved only by adjusting the peak wavelength to about 600 nm of the cobalt aluminum oxide fine particles in the coating 6, but the improvement in the red color rendering index R9 is insufficient.

  On the other hand, the lamps L1 and L2 having the coating 6 mainly composed of the cobalt aluminum oxide fine particles, the gold fine particles, and the silicon compound have a light amount (total luminous flux) lower than that of the lamp L without the coating 6, but 600 nm. There is an absorption peak in the vicinity and at 530 to 540 nm, the yellow color is reduced by reducing the yellow light, the average color rendering index Ra and the red color rendering index R9 are both high, and the color deviation duv is It is possible to obtain a high-pressure discharge lamp suitable for illuminating products centered on warm red, such as food and clothing, which can be controlled to the minus side and has little change.

Table 1 shows a high-pressure discharge lamp L1 in which a visible selective absorption film 6 is formed of a material mainly composed of cobalt aluminum oxide fine particles, gold fine particles, and a silicon compound shown in the first embodiment, and iron oxide is used as the material. Chromaticity coordinates (x, y) and color of three kinds of lamps, the high-pressure discharge lamp L2 shown in the second embodiment in which the added film is formed and the conventional high-pressure discharge lamp L in which the film is not formed for comparison. It is a comparison table of various light emission characteristics such as temperature (CCT (K)), color deviation (duv), color rendering index (Ra, R9), and light quantity ratio (%). (Note that each lamp was manufactured under the same conditions except for the coating.)

  Next, a third embodiment of the high-pressure discharge lamp of the present invention will be described. FIG. 3 is a front view of the reflective high-pressure discharge lamp L3, and the same parts as those of the lamp L1 in the above embodiment are given the same reference numerals and the description thereof is omitted.

  In the high-pressure discharge lamp L3 according to the third embodiment, a bulb-shaped reflective base 71 in which a bulb (outer tube) 1 forming an envelope is formed with a reflective film (not shown) on a surface made of hard glass or the like. And the front lens 72 have a PAR shape formed by adhesive bonding, mechanical bonding or fusion, and basically have the same light emission characteristics as those described in the first embodiment described above. Is configured such that the inner tube 2 in which the arc tube 4 having substantially the same configuration is sealed is accommodated, and the base 5 is joined to the base end portion of the reflective base 71.

  Then, the visible selective absorption film 6 having the light emission characteristics shown in the first embodiment is formed on at least one of the inner and outer surfaces of the front lens 72, here the outer surface, and the discharge lamp L3 shown in FIG. Obtained.

  Even in the reflective high pressure discharge lamp L3 in which the coating 6 is formed on the outer surface of the front lens 72 that forms the envelope as described above, the same effects as the high pressure discharge lamp of the first embodiment are achieved. A high-pressure discharge lamp suitable for illuminating a product centered on red, such as food and clothing, can be obtained.

  As described above, the high-pressure discharge lamps L1 to L3 of the present invention have a color temperature of 3600 to 4200K, a color deviation duv−0.002 to +0.004, an average color rendering index Ra of 85 or more, and a red color rendering before the coating 6 is formed. By using the arc tube 4 having various emission characteristics in the range of the evaluation number R9 of 60 to 75, the color temperature 3200 to 4200K, the color deviation duv0 to -0.005, the average color rendering evaluation number after the formation of the visible selective absorption film 6 Various light emission characteristics can be exhibited when Ra and red color rendering index R9 are 90 or more.

  Note that the high-pressure discharge lamps L1 to L3 of the present invention can improve productivity, such as the operation of forming the film 6 and the firing temperature being lower than the conventional one.

  FIG. 4 is a cross-sectional front view of an essential part showing an illuminating device (apparatus) composed of a spotlight for indoor lighting using the high-pressure discharge lamp L1 or L2 according to the embodiment of the present invention.

  The illuminating device (instrument) 9 includes a mounting base 91 attached to a ceiling surface and the like, a support column 92, a box-like equipment body 94 having an opening 93 that emits light on at least one surface, and a socket provided in the equipment body 94. 95, a reflecting mirror 96, and a translucent front cover 97 made of glass, synthetic resin, or the like covering the opening 93 is configured as a main component.

  The instrument main body 94 can be rotated in a horizontal plane and a vertical plane with respect to the mounting base 91 via a support column 92. Further, the lighting circuit device (not shown) may be disposed in the instrument main body 94 or the mounting base 91, or may be separately disposed on the back of the ceiling or the like.

  In this lighting device (apparatus) 9, when the high-pressure discharge lamp L <b> 1 formed with the visible selective absorption film 6 attached to the socket 95 is energized and lit through a lighting circuit device (not shown), direct light and reflection from the reflecting mirror 96 are generated. Light is irradiated toward a product such as clothing through a translucent front cover 97 provided in the opening 93 through which light passes. At this time, the irradiated light exhibits the light emission characteristics shown in Table 1, for example, and illumination with a good appearance with improved reproducibility such as red of the product can be performed.

  In this kind of lighting device (apparatus) 9, the visible selective absorption film 6 is formed on the inner or outer surface of the translucent front cover 97 by the same material or method as described above, and the socket 95 is formed. Even if a high-pressure discharge lamp L not formed with the visible selective absorption film 6 described in Table 1 is attached and the lamp L is turned on, the light emitting opening 93 is applied to a product such as clothing through the film 6. Illumination can be performed with good directivity by improving the reproducibility of products such as red.

  Even when the visible selective absorption film 6 is formed on the surface of the translucent front cover 97, the material for forming the film 6 is mainly composed of cobalt aluminum oxide fine particles, gold fine particles and silicon-based compounds, or iron oxide, oxide. It may be formed by adding at least one oxide fine particle selected from zinc, aluminum oxide, silicon oxide, and yttrium oxide, and by adjusting the color temperature, film thickness, transmittance, etc., coating strength Can be improved.

  Even when the coating 6 is formed on the surface of the translucent front cover 96 on the side of the lighting device (apparatus) 9 as described above, the same effects as the high-pressure discharge lamps of the first to third embodiments are obtained. It is possible to obtain an illuminating device (apparatus) 9 suitable for illuminating a product centered on red, such as food and clothing.

  The present invention is not limited to the above embodiment. For example, in the above embodiment, the metal halide lamp is described as the high pressure discharge lamp. However, the high pressure discharge lamp is not limited to the metal halide lamp, and may be a lamp such as a high pressure sodium lamp or a mercury lamp. In short, a predetermined selective absorption film is not formed. The above-described effects can be obtained by applying the present invention to a lamp having light emission characteristics.

  When the hermetic vessel constituting the arc tube is formed by translucency, for example, single crystal metal oxide such as sapphire, polycrystalline metal oxide, such as translucent airtight aluminum oxide, yttrium-aluminum- Garnet (YAG), yttrium oxide (YOX), polycrystalline non-oxide such as aluminum nitride (AlN) can be used, and in addition to ceramic materials, quartz glass, borosilicate glass, aluminosilicate glass, etc. are used. The shape can be G-shaped, T-shaped, or the like or a composite shape thereof.

  The outer tube and inner tube forming the envelope are made of hard glass such as quartz glass, borosilicate glass or aluminosilicate glass, or soft glass such as soda lime glass, and the shapes thereof are A type, G type and R type. , T-type, PS-type, BT-type, etc., or those formed in a composite shape can be used. In addition, the envelope can be applied to multiple tubes such as a double tube and a triple tube, and these envelopes may be airtight or non-airtight, and may be a middle tube (shroud) that prevents scattering of the arc tube container. ) May be provided.

  In addition, the high-pressure discharge lamp has at least a pair of discharge electrodes sealed in an arc tube, and the starting circuit unit disposed in the envelope is not limited to an ultraviolet light source such as a UV enhancer, but a lighting tube or the like. It may be used.

  In addition, the visible selective absorption film forming part may be at least one of an outer tube, an inner tube, a front lens, etc., or an inner / outer surface of a member such as a front cover of a lighting device (equipment). It may be determined in consideration of the heat-resistant temperature, forming workability and the like.

  The material for forming the visible selective absorption film is mainly composed of cobalt aluminum oxide fine particles, gold fine particles, and a silicon compound, but a slight amount of other materials may be added thereto.

  Moreover, if the film thickness of the visible selective absorption film is in the range of 1 to 10 μm, the above-mentioned emission characteristic range can be satisfied, and if it is less than 1 μm, it is necessary to increase the concentration of the inorganic compound with absorption, resulting in a decrease in transmittance. It is easy to affect the optical characteristics such as, and when it exceeds 10 μm, the amount of material used is increased and the coating strength is easily lowered, and the variation in transmittance is increased.

  It should be noted that the light emission characteristics within a predetermined range can be obtained by adjusting the film thickness of the coating, and this adjustment is performed by adjusting the coating solution concentration, the pulling speed of the outer tube from the coating solution, and the coating solution immersion. By changing the number of times, a desired film thickness can be obtained. Further, the formation of the film is not limited to immersion in the coating solution, but may be a means such as spraying or vapor deposition.

  Furthermore, the lighting device (equipment) is not limited to the one shown in the above embodiment, and even if the lighting circuit device is provided in the fixture main body, the lighting circuit device is provided outside the main body and connected to the high-pressure discharge lamp. Furthermore, depending on the discharge lamp, a lens or a light-transmitting front cover member may not be provided on the reflector body or the light emission side in the apparatus main body.

  This illuminating device is preferable for illumination in stores or restaurants that handle food and clothing.

L1 to L3: High pressure discharge lamp (metal halide lamp)
1: Outer tube (envelope)
2: Inner tube 21: Airtight container 4: Arc tube 6: Visible selective absorption film 9: Lighting device (equipment)
94: Instrument body 96: Translucent front cover member

Claims (4)

An arc tube in which a discharge medium comprising a luminescent material and a rare gas is sealed in an airtight container;
An envelope surrounding the arc tube;
A visible light selective absorption film formed by mixing cobalt aluminum oxide fine particles, gold fine particles and a silicon-based compound as main materials on the surface of the envelope;
A high-pressure discharge lamp having a color temperature of 3600 to 4200K, a color deviation of duv0 to -0.005, an average color rendering index Ra and a red color rendering index R9 of 90 or more.   The high-pressure discharge lamp according to claim 1, wherein the visible light selective absorption film is formed to include at least one of zinc oxide, aluminum oxide, silicon oxide, and yttrium oxide. An arc tube in which a discharge medium comprising a luminescent material and a rare gas is sealed in an airtight container;
An envelope surrounding the arc tube;
A visible light selective absorption film formed on the surface of the envelope by using cobalt aluminum oxide fine particles, gold fine particles, and a silicon oxide compound as main materials, and adding and mixing iron oxide thereto;
A high-pressure discharge lamp characterized by having a color temperature of 3200 to 3600K, a color deviation of duv0 to -0.005, an average color rendering index Ra and a red color rendering index R9 of 90 or more. An instrument body;
A high pressure discharge lamp mounted in a socket disposed within the appliance body;
A translucent front cover member provided to close the opening of the instrument body;
A visible light selective absorption film formed by mixing cobalt aluminum oxide fine particles, gold fine particles and a silicon compound as main materials on the surface of the translucent front cover member;
An illumination device characterized by irradiating light at a color temperature of 3600 to 4200K, a color deviation duv0 to -0.005, an average color rendering index Ra and a red color rendering index R9 of 90 or more.

Images