JP3708679B2 - Discharge vessel, electrodeless metal halide discharge lamp, electrodeless metal halide discharge lamp lighting device and lighting device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a discharge vessel suitable for an electrodeless discharge lamp enclosing a metal halide, an electrodeless metal halide discharge lamp using the same, an electrodeless metal halide discharge lamp lighting device, and an illumination device.
[0002]
[Prior art]
  In an electroded metal halide lamp, an attempt to obtain a desired effect while encapsulating an excess of metal with respect to halogen while suppressing free halogen is disclosed in Japanese Patent Laid-Open Nos. 55-18919 and 55-. 4860 and the like.
[0003]
  Also, it is intended to obtain an electrodeless metal halide discharge lamp having good color, efficiency and average color rendering index Ra by enclosing neodymium as a luminescent metal in the form of a halide and reducing mercury. 7-24211.
[0004]
[Problems to be solved by the invention]
  The life of electroded metal halide lamps is mainly limited by the following factors.
[0005]
  (1) Reduction in luminous flux maintenance factor A reduction in luminous flux maintenance factor occurs due to blackening and devitrification of the arc tube.
[0006]
  Blackening is mainly caused by the formation of a film on the inner wall of the arc tube due to the scattering of the electrode and the adhesion of the reaction product between the metal halide and the electrode.
[0007]
  Devitrification occurs due to the reaction between the metal halide and the quartz glass constituting the discharge vessel.
[0008]
  (2) Arc extinction and shaking Arc extinction and shaking are caused by a rise in lamp voltage. The increase in lamp voltage is caused by blackening of the arc tube, generation of free halogen, and the like.
[0009]
  (3) Start failure Start failure occurs due to contamination of impure gas into the arc tube, generation of free halogen, electrode deformation, electrode emitter depletion, start element or start circuit failure, and the like.
[0010]
  (4) Rupture and leak of arc tube Rupture and leak of the arc tube are caused by devitrification of the arc tube, cracks in the sealing portion, and the like.
[0011]
  (5) Light color deterioration and uneven color light color deterioration occur due to consumption of light emitting metals such as Na and Li.
[0012]
  Color unevenness is caused by an inappropriate attachment position of the arc tube on the encapsulated material or occurrence of arc color separation.
[0013]
  Among the above factors, (2) to (5) can be improved if they are appropriately designed and manufactured, but (1) is very difficult.
[0014]
  As an example of improving (1), Japanese Patent Application Laid-Open No. 48-60484 discloses a method in which tin halide is encapsulated.
[0015]
  Although the luminous flux maintenance factor is certainly improved, the luminous efficiency, startability, and electrode life are likely to deteriorate.
[0016]
  Therefore, in the electrode-coated metal halide lamp, the luminous flux maintenance factor of (1) could not be improved without deteriorating the factors (2) to (5).
[0017]
  In contrast, in an electrodeless metal halide lamp, since there is no electrode sealed in the discharge vessel, blackening of the discharge vessel does not occur essentially, and if the halide to be sealed is selected appropriately, it will be lost. Since the transparency can be reduced, it has the characteristic that a high luminous flux maintenance factor can be easily obtained as a result.
[0018]
  Therefore, in the electrodeless metal halide lamp, the lifetime is limited by the following matters in relation to the factors (2) to (5).
[0019]
  (2) Caused by the extinction of the arc and the generation of free halogen.
[0020]
  (3) Start failure It is generated due to contamination of impure gas, generation of free halogen and start circuit failure.
[0021]
  (4) It occurs due to devitrification when the arc tube ruptures and the leak enclosure or discharge vessel temperature is not appropriate.
[0022]
  (5) Light color deterioration occurs due to light color deterioration and wear of Na, Li, etc., which are light-emitting metals.
[0023]
  This occurs due to an improper position of the enclosed container attached to the discharge vessel or the occurrence of arc color separation.
[0024]
  In the above (2) and (3), the reason for the generation of free halogen is as follows.
[0025]
  That is, the generated free halogen is completely evaporated under the operating temperature of the lamp, which is approximately 500 to 1000 ° C., so that the vapor pressure becomes high. Evaporated halogen gas, especially iodine gas, has high electron adsorption, so it can increase the dielectric breakdown voltage, make it difficult to transition from glow discharge to arc discharge, or cause arc swing by contracting the arc. Increase the re-ignition voltage to make it easier to turn off the arc.
[0026]
  Halogen also exhibits a relatively high vapor pressure even at room temperature when starting, making starting difficult.
[0027]
    FIG. 8 is a graph showing the relationship of the free halogen gas concentration to the lighting time in a conventional electrodeless metal halide discharge lamp.
[0028]
  In the figure, the horizontal axis represents the lighting time, and the vertical axis represents the relative free halogen gas concentration (%).
[0029]
  Curves A and B are lamps in which different metal halides are sealed, and it can be seen that the concentration of free halogen gas increases as the lighting time increases.
[0030]
  The factor (4) can be suppressed by appropriately designing the temperature control of the enclosure and the discharge vessel as low as possible.
[0031]
  The factor (5) can be avoided by enclosing excessively in anticipation of the consumption of the luminescent metal, or by appropriately designing the coldest part of the discharge vessel.
[0032]
  On the other hand, in the electrodeless discharge lamp, since the plasma approaches the discharge vessel, the reaction between the discharge vessel and the enclosed metal and the disappearance of the permeated metal through the discharge vessel wall are accelerated.
[0033]
  In addition, in the case of an inductively coupled electrodeless metal halide lamp, since the induction coil is disposed close to the discharge vessel, a strong electric field due to the induction coil acts on the discharge vessel and the discharge medium. Is attracted in the form of metal ions, the loss of permeation of the encapsulated metal is further accelerated.
[0034]
  Further, when mercury is not essentially enclosed in the discharge vessel, there are the following problems. First, when mercury is encapsulated, free halogen is trapped by mercury and becomes HgI, which reduces the vapor pressure of halogen, especially iodine near room temperature at the time of starting. Otherwise, such an effect cannot be expected, so that the halogen vapor pressure at the time of starting becomes high, making starting difficult.
[0035]
  Secondly, since mercury is essentially not present in the discharge vessel, the pressure in the discharge vessel at the time of lighting is much smaller than that in which mercury is enclosed, such as an electroded metal halide lamp. This increases the mean free path and increases the probability that metal atoms dissociated from the metal halide in the plasma will reach the discharge vessel wall, thereby accelerating the reaction with the discharge vessel and loss of transmission.
[0036]
  Due to the synergistic effect of the above problems, an electrodeless metal halide lamp has a higher generation rate of free halogen than an electroded metal halide lamp. Therefore, in an electrodeless metal halide lamp, free halogen is a life limiting factor. The biggest factor.
[0037]
  Disclosed is a discharge vessel suitable for an electrodeless metal halide discharge lamp, in which free halogen is suppressed, arc discharge and arc extinguishment of discharge do not easily occur, and startability does not deteriorate, and electrodeless metal halide discharge lamp using the same An object is to provide an electrodeless metal halide discharge lamp lighting device and a lighting device.
[0038]
[Means for achieving the object]
    The discharge vessel of the invention of claim 1 is a refractory and radiation-transmitting hermetic vessel; a halogen enclosed in the hermetic vessel; a metal that forms halogen and a metal halide, and 1 mol of metal halide. Halogen getter metal which is an excess metal with respect to 0.0005 mol or more of halogen and easily reacts with a luminescent metal and free halogen to form a metal halide, but hardly reacts with an airtight containerAs SnI ₂ Make up tinAnd a metal enclosed in an airtight container; and a buffer gas enclosed in the airtight container, and is essentially free from mercury.
[0039]
  In the present invention and each of the following inventions, the definitions and technical meanings of terms are as follows unless otherwise specified.
[0040]
  First, the airtight container will be described.
[0041]
  An airtight container may be fireproof as long as it can withstand the normal operating temperature of the discharge container.
[0042]
  To be radiation transmissive means that the radiation generated by the discharge can be derived to the outside. It is not necessary for almost the whole airtight container to be able to derive radiation, but it is sufficient that radiation can be derived from a desired portion.
[0043]
  As a material having fire resistance and radiation transparency, translucent ceramics such as quartz glass, translucent alumina, and YAG, and single crystals thereof can be used. As the quartz glass, fused quartz and synthetic quartz can be used.
[0044]
  The shape of the airtight container varies depending on the electric energy supply means.
[0045]
  When an induction coil is used as the electric energy supply means, the induction coil becomes a primary coil of the transformer, and the induction coil is generated to form a ring-shaped discharge arc around the magnetic flux passing through the inside of the hermetic container. Since the arc acts as a single-turn secondary coil, the hermetic container is generally approximately elliptical or approximately spherical. Note that the term “substantially elliptical sphere” as used herein includes an elliptical sphere and further includes a shape similar to the elliptical sphere. Similarly, a substantially spherical shape is a spherical shape and a similar shape thereto.
[0046]
  On the other hand, in the case of capacitive coupling, since the enclosure of the discharge vessel is interposed as a dielectric between a pair of electrodes arranged almost in parallel, it is common for the hermetic vessel to have a flat shape. is there.
[0047]
  Further, if desired, an airtight thin tube for starting, that is, a starting thin tube can be integrally formed in the airtight container. It is assumed that the starting gas is sealed at a relatively low pressure in the starting thin tube. And at the time of starting, a starting voltage is applied to the starting thin tube, first, the starting gas is subjected to dielectric breakdown and plasma discharge is performed, and then a high voltage is applied to the buffer gas in the hermetic container, This can be started by causing dielectric breakdown to generate plasma discharge.
[0048]
  Further, the discharge vessel can be supported at a predetermined position by using the starting thin tube.
[0049]
  Furthermore, the discharge vessel can also be suspended in an envelope surrounding them using a starting capillary. In this case, the envelope can mechanically protect the discharge vessel.
[0050]
  Next, halogen will be described.
[0051]
  As the halogen, one or more of iodine, bromine, chlorine and fluorine are acceptable.
[0052]
  The metal will be described.
[0053]
  The metal enclosed in the airtight container is a luminescent metal and a halogen getter metalAs SnI ₂ Consists of tin (Sn)And a metal that forms a halogen and a metal halide and an excess metal with respect to the halogen.
[0054]
  The halogen getter metal and the metal excessive to the halogen may be the same or different. That is, halogen getter metalAs tinButTinHalide(SnI ₂ )And a part of the light emitting metal may be an excess metal with respect to the halogen. Because even in the latter case, the halogen gettering metal during lightingAs SnI ₂ Make up tinGet more free halogensTinHalide (SnI ₄ )This is because it can be dissociated to become tin (Sn) as a halogen getter metal and can act to get free halogen.
[0055]
  The luminescent metal can be selected and used as desired, alone or in combination, from all the metals known as luminescent metals for metal halide discharge lamps depending on the desired radiation and its arc efficiency. For example, Na, Sc, Nd, Tl, In, Dy, Cs, etc. can be used.
[0056]
  ScI is a combination of luminescent metal halides._Three-NaI, NaI-TlI-InI, DyI_Three-NdI_Three-CsI, NdI_Three-NaI etc. are useful. In addition, as the amount of sealing, for example, about 0.2 to 5 mg of each halide per 1 cc of the internal volume of the airtight container is recommended.
[0057]
  Halogen getter metalTypicallyIt must react easily with free halogen to form a metal halide, but it must be a metal that is difficult to react with an airtight container.
[0058]
  As the halogen getter metal, it is practically possible to obtain an appropriate metal from the metals or semiconductors of groups 3B, 4B, 5B and 6B of the periodic table.HoweverIn the present invention, the metal of the halogen getter metalInOf the aboveSnI ₂ That uses tin (Sn)The
[0059]
  On the other hand, Sc, Na, Dy, Nd, and the like have a halogen getter property, but these metals cannot be used because they react vigorously with quartz in an airtight container.
[0060]
  In the present invention, the reason why the excess metal is 0.0005 mol or more with respect to 1 mol of metal halide is that if the above amount is enclosed, the halogen gettering metal during lightingAs SnI ₂ Make up tinIs more multivalentTinIt is because it becomes a halide and free halogen can be obtained over a required long period of time to suppress the formation of free halogen. Halogen getter metalAs SnI ₂ Make up tinThat the product becomes a multivalent metal halide.₂Is SnI_FourTo become.
[0061]
  Halogen getter metalAs SnI ₂ Make up tinIf too much is encapsulated, the efficiency will decrease, or the color deviation with respect to black body radiation will increase in order to suppress the light emission of a particular encapsulated metal, so care must be taken.
[0062]
  The buffer gas will be described.
[0063]
  A rare gas such as Xe, Ar, or Kr is used as the buffer gas. However, when the hermetic container is made of quartz glass, Ne is easy to permeate, so it is not suitable as a buffer gas.
[0064]
  Further, mercury will be described.
[0065]
  In the present invention, the fact that Hg is essentially not encapsulated is as follows. Even if Hg is present in the discharge vessel, it generally means less than 1 mg per 1 cc of the internal volume of the discharge vessel. Moreover, Preferably it is less than 0.3 mg, More preferably, it is less than 0.2 mg. That is, in an electrodeless metal halide discharge lamp, Hg vapor as a buffer gas is essentially unnecessary.
[0066]
  Finally, the operation will be described.
[0067]
  An electrodeless metal halide lamp is constructed using a discharge vessel, and this is a halogen gettering metal during lightingAs SnI ₂ Make up tinWhen free halogen is generated, halogen gettering metalAs SnI ₂ Make up tinCan quickly get halogen gas and more polyvalentTinHalide(SnI ₄ )become.
[0068]
  As a result, since generation of free halogen during lighting is suppressed, an increase in the lamp voltage is reduced, so that arc extinction and arc swing can be reduced.
[0069]
  Furthermore, starting failure can be reduced by suppressing free halogen.
[0070]
  As a result, the discharge vessel and the electrodeless metal halide discharge lamp have a long life.
[0071]
    Claim2The discharge vessel according to claim 1 is the discharge vessel according to claim 1, wherein the halogen getter metalAs SnI ₂ Make up tinIs characterized by being 0.58 mol or less per mol of the halide of the luminescent metal.
[0072]
  The present invention relates to a halogen getter metalAs SnI ₂ Make up tinIt defines the maximum value of the general amount of filling.
[0073]
    Claim3The discharge vessel of the present invention is the first aspect.Or 2In the described discharge vessel, a halogen getter metalAs SnI ₂ Make up tinIs characterized by being 0.1 mol or less per mol of the halide of the luminescent metal.
[0074]
  The present invention relates to a halogen getter metalAs SnI ₂ Make up tinThe maximum value of the preferable encapsulated amount is defined for.
[0075]
    Claim4An electrodeless metal halide discharge lamp according to the invention of claim 13A discharge vessel according to any one of the above, and an electrical energy supply means for supplying electric energy to an enclosure in the discharge vessel to generate a light emitting arc.
[0076]
  The electric energy supply means may be either capacitive coupling type or inductive coupling type.
[0077]
  Further, as described in claim 1, the shape of the discharge vessel may be an optimum shape according to the form of the electric energy supply means.
[0078]
    Claim5The electrodeless metal halide discharge lamp of the invention of claim4In the electrodeless metal halide discharge lamp described, the electric energy supply means is an induction coil that supplies electric energy of radio frequency.
[0079]
  The present invention defines an optimum frequency band when using an inductively coupled electric energy supply means. Here, the radio frequency refers to a range of 0.1 to 300 MHz.
[0080]
    Claim6The electrodeless metal halide discharge lamp lighting device of the invention is claimed in claim4Or5And a power supply device that outputs electric energy to the electric energy supply means.
[0081]
  The present invention comprises an electrodeless metal halide discharge lamp and a power supply device to constitute a lighting device.
[0082]
    Claim7The illuminating device of the invention is provided with the illuminating device main body; and the illuminating device main body.4Or5And an electrodeless metal halide discharge lamp as described above.
[0083]
  The present invention is suitable for all uses where an electrodeless metal halide discharge lamp such as various lighting fixtures and various ultraviolet irradiation devices is used as a radiation source and the radiation is used for a predetermined purpose.
[0084]
  For various lighting fixtures, such as ceiling lighting fixtures and wall lighting fixtures for indoor use, and road lighting fixtures, tunnel lighting fixtures, landscape lighting fixtures, especially bridge lighting, and building lighting for outdoor use. The present invention can be applied to installed lighting equipment.
[0085]
  Various ultraviolet irradiation devices can be applied to ultraviolet curing devices, ultraviolet exposure devices, ultraviolet sterilization devices, ultraviolet ashing devices, and the like.
[0086]
DETAILED DESCRIPTION OF THE INVENTION
  Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0087]
    FIG. 1 is a cross-sectional view showing a first embodiment of a discharge vessel and an electrodeless metal halide discharge lamp according to the present invention.
[0088]
  In the figure, 1 is an electrodeless metal halide discharge lamp.
[0089]
  The electrodeless metal halide discharge lamp 1 includes a discharge vessel 1a and electric energy supply means 1b.
[0090]
  The discharge vessel 1a comprises a hermetic vessel 1a1 made of fused silica glass and having a substantially elliptical shape with a diameter of about 30 mm, and a starting capillary 1a2 formed integrally at the center of the upper surface of the hermetic vessel 1a1.
[0091]
  A discharge medium made of halogen, metal, and buffer gas is sealed in the hermetic container 1a1.
[0092]
  The metal consists of a chemical equivalent of metal and an excess of metal that produces halogen and metal halide. In addition, these metals include light-emitting metals and halogen getter metals when classified according to their purposes.
[0093]
  In the present embodiment, the luminescent metal is enclosed as a metal halide, and the halogen getter metal is enclosed as a single metal. ScI3-NaI was used as the luminescent metal.
[0094]
  Table 1 shows the amount of encapsulated metal with respect to 1 mole of halide of a getter metal and a luminescent metal.
[0095]
                                    [Table 1]
          No. Halogen getter metal content (mol)
          1 In 0.14
          2 Sn 0.6
          3 Pb 0.043
          4 Ge 0.12
        5 Sb 0.12
        6 Bi 0.12
  As the buffer gas, 26.7 KPa of Xe was enclosed.
[0096]
  The starting capillary 1a2 was filled with 2.7 KPa (20 torr) of Ar.
[0097]
  The electric energy supply means 1b is composed of an induction coil formed by winding a flat metal plate for two turns, and the plate surface is aligned parallel to the radial direction so as not to cut off radiation as much as possible. Therefore, the electrical energy supply means 1b of this embodiment is an induction coil.
[0098]
  In the figure, 2 conceptually shows a discharge arc, which is formed in a ring shape concentric with the electric energy supply means 1b comprising an induction coil.
[0099]
  The test results conducted after inputting 300 W into the above discharge vessel 1a and lighting for 1000 hours will be described below.
[0100]
  In Example 1, generation | occurrence | production of the free iodine was not seen and there was no devitrification of the airtight container 1a1. The luminous efficiency was 45% when In was not enclosed. It is considered that this is because the added In emits blue light and the efficiency is lowered. However, the phenomenon that In suppresses the light emission of the specific light emitting metal was small.
[0101]
    FIG. 2 is a graph showing the relationship of the luminous efficiency to the added amount of In.
[0102]
  In the figure, the horizontal axis represents the number of moles of excess In relative to 1 mole of metal halide, and the vertical axis represents relative luminous efficiency (%).
[0103]
  Since the minimum luminous efficiency of this type of lamp is about 60%, the amount of In added is suitably 0.1 mol or less per 1 mol of metal halide.
[0104]
  In Example 2, the generation of free iodine was not observed and there was no devitrification. Luminous efficiency was 92% when Sn was not added, but Sc emission was weakened and orange light was emitted, and the average color rendering index Ra was 100% when the average color rendering index Ra was not added. Of 58%.
[0105]
    FIG. 3 is a graph showing the relationship of the average color rendering index Ra to the added amount of Sn.
[0106]
  In the figure, the horizontal axis represents the number of moles of excess Sn relative to 1 mole of metal halide, and the vertical axis represents the relative Ra change (%).
[0107]
  From the figure, when the average color rendering index Ra when Sn is not added is 100%, in order to secure 60% or more, the addition of Sn may be 0.58 mol or less.
[0108]
  Also in Pb and Ge of Examples 3 and 4, similar to Example 2, the light emission was orange, and the average color rendering index Ra was lowered. For the same reason as Sn, if the addition amount is 0.58 mol or less, a good average color rendering index Ra can be obtained.
[0109]
  In each of Examples 2 to 4, since the decrease in luminous efficiency is small, the addition amount of these metals can be determined mainly from the viewpoint of the average color rendering index Ra.
[0110]
  In Example 5, no generation of free iodine was observed, and there was no devitrification. The luminous efficiency was 76% when Bi was not enclosed. The decrease in the average color rendering index Ra was small.
[0111]
  In Example 6, the same as Example 5, but the luminous efficiency was 89% when Sb was not added.
[0112]
    FIG. 4 is a graph showing the relationship of the luminous efficiency to the added amounts of Bi and Sb.
[0113]
  In the figure, the horizontal axis represents the number of moles of excess Bi and Sb relative to 1 mole of metal halide, and the vertical axis represents the relative luminous efficiency (%).
[0114]
  Each curve has a corresponding element symbol.
[0115]
  From the figure, practical addition amounts are 0.22 mol or less for Bi and 0.49 mol or less for Sb.
[0116]
    FIG. 5 is a circuit diagram showing an example of a power source in the electrodeless metal halide discharge lamp lighting device of the present invention.
[0117]
  3 is a DC power source, 4 is an inverter device, and 5 is a lighting circuit.
[0118]
  The DC power source 3 can be obtained by rectifying an AC power source or can be obtained from a battery or the like.
[0119]
  The inverter device 4 has a DC power source 3 connected to the input end and a lighting circuit 5 connected to the radio frequency output end.
[0120]
  As a circuit configuration of the inverter device 4, for example, a half bridge type inverter circuit in which a pair of switching means 4a and 4b are connected in series is used, and each switching means 4a and 4b is alternately turned on and off by a drive circuit 4c. And output a 13.56 MHz radio frequency to the output end.
[0121]
  The switching means 4a and 4b are field effect transistors that exhibit excellent switching characteristics even in the radio frequency region. The capacitor 4d connected in series to the output end is for impedance matching on the inverter device side.
[0122]
  The lighting circuit 5 includes a lighting main circuit 5a and a starting circuit 5b.
[0123]
  The lighting main circuit 5a includes an impedance matching capacitor 5a1 connected in parallel between the input terminals and an electric energy supply means 1b including an induction coil connected in parallel with the capacitor 5a1.
The starting circuit 5b is connected in parallel with the lighting main circuit 5a, and includes a series circuit of a capacitor 5b1, a parallel resonant circuit 5b2, and a switch 5b3.
[0124]
  The parallel resonance circuit 5b2 is configured by connecting an inductor L, a capacitor C, and a resistor R in parallel, and applies the resonance voltage of the parallel resonance circuit 5b2 to the starting capillary 1a2 formed integrally with the discharge vessel 1a. The resistor R controls the Q of the parallel resonant circuit 5b2 to adjust the starting voltage to a desired value.
[0125]
  Thus, to turn on the electrodeless metal halide discharge lamp 1 composed of the discharge vessel 1a and the electric energy supply means 1b, the switch 5b3 of the starting circuit 5b is first closed. Then, since the parallel resonance circuit 5b2 causes parallel resonance, a high voltage is generated at both ends thereof. This high voltage is applied to the external electrode 1a3 attached to the starting capillary 1a2.
[0126]
  Due to the high voltage applied from the external electrode 1a3, the rare gas in the starting capillary 1a2 is broken down, and plasma discharge is first started. When the gas in the starting thin tube 1a2 is plasma-discharged, a high voltage is applied to the discharge vessel located between the starting thin tube and the electric energy supply means 1b, and the discharge medium in the discharge vessel is broken down to cause plasma discharge. Start. In this state, a radio frequency current flows through the induction coil 1b to generate a magnetic flux. Since this magnetic flux penetrates the plasma in the discharge vessel, a secondary current flows in the plasma around the magnetic flux. As a result, arc discharge is generated around the magnetic flux in a ring shape, and emission of the characteristic spectrum of the luminescent metal is performed from the arc discharge.
[0127]
  The radiation extracted from the discharge vessel 1a can be dimmed and used for illumination as desired.
[0128]
    FIG. 6 is a partially cutaway side view showing a road lighting device showing an embodiment of the lighting device of the present invention.
[0129]
  In the figure, 6 is a pole and 7 is a lighting device body.
[0130]
  The base end of the pole 6 stands from the road surface.
[0131]
  The illumination device main body is attached to the tip of the pole 6.
[0132]
    FIG. 7 is a conceptual diagram showing an illuminating device body in a road luminaire that is an embodiment of the illuminating device of the present invention.
[0133]
  In the figure, the same parts as those in FIG. 1 and FIG.
[0134]
  7a is a housing, 7b is a translucent lower surface cover, 7c is a reflecting plate, 7d is a first box, and 7e is a second box.
[0135]
  The first box 7d accommodates the impedance matching capacitor 5a1 in FIG. 1 and supports the induction coil 1b by supporting its terminal 1b1.
[0136]
  The second box 7e supports the discharge vessel 1 by housing the starting circuit in FIG. 1 and supporting the thin tube 1a2.
[0137]
  Therefore, as can be understood from the above description, the inverter device 4 in FIG. 5 is housed in a place separated from the lighting device body 7, for example, in the lower end portion of the pole 6, or a separate power supply box (not shown). ).
[0138]
【The invention's effect】
    Claim 1 to3According to each of the inventions, in addition to a metal that forms a metal halide, an excess metal is enclosed in an amount of 0.0005 mol or more with respect to 1 mol of the metal halide.As SnI ₂ Make up tinWhen free halogen is generated due to the inclusion ofSnI ₂ The tin that composesGet free halogen quicklyIn addition, a multivalent tin halide (SnI ₄ )Therefore, it is possible to provide a discharge vessel suitable for an electrodeless metal halide discharge lamp in which arcing of the discharge and arc extinguishment are unlikely to occur and startability is unlikely to deteriorate.
[0139]
    Claim2In addition, according to the invention of the halogen getter metalAs SnI ₂ Make up tinThe discharge vessel having a general effect can be provided by defining the encapsulated amount of 0.58 mol or less with respect to 1 mol of the halide of the luminescent metal.
[0140]
    Claim3In addition, according to the invention of the halogen getter metalAs SnI ₂ Make up tinBy defining the encapsulated amount of 0.1 mol or less with respect to 1 mol of the halide of the luminescent metal, a discharge vessel having a preferable effect can be provided.
[0141]
    Claim4According to the present invention, claims 1 to3An electrodeless metal halide discharge lamp having the following effects can be provided.
[0142]
    Claim5According to the invention, it is possible to provide an electrodeless metal halide discharge lamp in which the electric energy supply means is an induction coil for supplying radio frequency electric energy.
[0143]
    Claim6According to the present invention, claims 1 to3It is possible to provide an electrodeless metal halide discharge lamp lighting device having the above effects.
[0144]
    Claim7According to the present invention, claims 1 to3It is possible to provide a lighting device having the following effects.
[Brief description of the drawings]
FIG. 1 is a sectional view showing a first embodiment of a discharge vessel and an electrodeless metal halide discharge lamp of the present invention.
FIG. 2 is a graph showing the relationship between luminous efficiency and the amount of In added.
FIG. 3 is a graph showing the relationship between the average color rendering index Ra and the amount of Sn added.
FIG. 4 is a graph showing the relationship of luminous efficiency with respect to the added amounts of Sb and Bi.
FIG. 5 is a circuit diagram showing an example of a power source in the electrodeless metal halide discharge lamp lighting device of the present invention.
FIG. 6 is a notched side view showing a road lighting apparatus according to an embodiment of the lighting device of the present invention.
FIG. 7 is a conceptual diagram showing a lighting device main body in a road lighting device showing an embodiment of the lighting device of the present invention.
FIG. 8 is a graph showing the relationship between the free halogen gas concentration and the lighting time in a conventional electrodeless metal halide discharge lamp.
[Explanation of symbols]
      1 ... Electrode-free metal halide discharge lamp
      1a ... discharge container
      1a ... Airtight container
      1a2 ... Starting capillary
      1a3 ... External electrode
      1b: Electric energy supply means
      2 ... Discharge arc

Claims (7)

Fireproof and radiation permeable airtight container;
With halogen enclosed in an airtight container;
Excess of 0.0005 mol or more of halogen with respect to 1 mol of metal and metal halide to form halogen and metal halide, and easily react with luminescent metal and free halogen to form metal halide a metal but which include tin constituting the SnI ₂ as nobler halogen getter metal is an airtight container, which is sealed in the airtight container;
A buffer gas enclosed in an airtight container;
And a discharge vessel characterized by essentially not containing mercury. The discharge vessel according to claim 1, wherein tin constituting SnI ₂ as a halogen getter metal is 0.58 mol or less per 1 mol of halide of the luminescent metal. Tin, the discharge vessel of claim 1 or 2, wherein the relative halides 1 mole of the light-emitting metal is 0.1 mol or less constituting the SnI ₂ halogen getter metal. A discharge vessel according to any one of claims 1 to 3 ;
Electrical energy supply means for supplying electrical energy to the enclosure in the discharge vessel to generate a light emitting arc;
An electrodeless metal halide discharge lamp comprising: 5. The electrodeless metal halide discharge lamp according to claim 4 , wherein the electric energy supply means is an induction coil for supplying electric energy of radio frequency. A metal halide discharge lamp according to claim 4 or 5 ;
A power supply that outputs electrical energy to the electrical energy supply means;
An electrodeless metal halide discharge lamp lighting device comprising: A lighting device body;
An electrodeless metal halide discharge lamp according to claim 4 or 5 , wherein the electrodeless metal halide discharge lamp is disposed in a lighting device body;
An illumination device comprising:

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