CN101752189A

CN101752189A - Metal halide lamp

Info

Publication number: CN101752189A
Application number: CN200910141565A
Authority: CN
Inventors: 藤冈纯; 田内亮彦
Original assignee: Harison Toshiba Lighting Corp
Current assignee: Toshiba Lighting and Technology Corp
Priority date: 2008-11-28
Filing date: 2009-05-31
Publication date: 2010-06-23
Also published as: KR20100061293A; TW201021079A; TWI455173B; JP2010129442A

Abstract

The invention provides a metal halide lamp. A pair of discharging electrodes (121, 122) is oppositely arranged in an axial direction in an air-tight container (11) which is made of ultraviolet ray transmitting quartz glasses and has an air-tight discharging space (10). Sufficient enclosing objects containing inert gases, mercury and proper amount of UV-light luminous iron and halogen are enclosed in the discharging space (10) to maintain the arc discharging state. When each lamp input power per unit of length is 50 to 160 w/cm, the enclosed quantity M (mg/cc) of the iron as the enclosed object relative to the volume of the discharging space (10) is arranged as: M is more than or equal to 0.002 but less than or equal to 0.15. Through the structure, the content of the iron relative to the volume of the discharging space (10) can be limited so as to prevent the part close to the water cooling type metal halide lamp electrode from becoming black.

Description

Metal halide lamp

Technical field

The present invention relates to a kind of irradiation ultraviolet radiation and be used for coating sclerosis or functional high-polymer film light reaction etc., be particularly suited for water-cooled metal halide lamp, in more detail, relate to a kind of technology that when the water-cooled metal halide lamp is lighted, near the melanism the electrode is suppressed.

Background technology

The sealed at both ends ultraviolet radiator that electrode is installed at discharge space of Japanese kokai publication hei 8-148121 (prior art 1) is maintained in the double-deck cast water collar that is made of interior pipe and outer tube.In discharge space, add mercury and inert gas, and add at least a in the metal halides such as iron, tin, thallium.And carry out arc discharge in the mercury vapor about 1 to 10 air pressure, metallic compound is enclosed, realize long wavelength zone luminous of wide cut.

The technology of above-mentioned patent documentation 1 is that a kind of interelectrode distance is that the Fe (iron) of the above so-called long arc of 1000mm is a metal halide lamp.This metal halide lamp in order to prolong the life-span of lamp, need cool off, so employing is the water-cooled of reliably cooling off.Under water-cooled situation, must apply diaphragm near the outer surface of the discharge space the electrode of lamp, but in lamp was lighted, diaphragm dispersed so that electrode temperature can not descend, the water collar of can making dirty is so can not apply.

Therefore, the iron of inclosure with produce alloying as the tungsten of electrode principal component and become low melting point, increase the easy more erosion quartz glass of the iron in lighting a lamp and produce melanism more with the ferroalloy amount of tungsten alloyization.Emission wavelength is long more, will increase the enclosed volume of iron more, therefore, exists the long then melanism of emission wavelength with regard to more obvious problem.

Summary of the invention

The object of the present invention is to provide a kind of metal halide lamp, its by the restriction tungsten electrode be enclosed in amount of the iron of discharge space, even while adopting water-cooled to cool off to make near the melanism that also can suppress under its environment of lighting a lamp the electrode.

Description of drawings

Fig. 1 is the basic block diagram that metal halide lamp one example of the present invention is described usefulness.

Fig. 2 is the enlarged drawing of Fig. 1 major part.

Fig. 3 is the Ia-Ib line cutaway view of Fig. 1.

Fig. 4 is used for illustrating the key diagram of iron phase for the relation of the alloy amount state of tungsten and melting temperature.

Fig. 5 is used to illustrate the key diagram of the amount of iron to the relation of the influence of melanism frequency, specific wavelength intensity.

Fig. 6 is the system construction drawing that the embodiment when metal halide lamp of the present invention being used to have the ultraviolet lamp of water-cooled cooling body describes usefulness.

Fig. 7 is the IIb-IIb line cutaway view of Fig. 6.

Embodiment

Below, with reference to accompanying drawing, describe in detail and implement the optimal morphology that the present invention uses.

Fig. 1～Fig. 3 is the figure that is used to illustrate an example of metal halide lamp of the present invention, and Fig. 1 is a basic block diagram, and Fig. 2 is the enlarged drawing of Fig. 1 major part, and Fig. 3 is the Ia-Ib line cutaway view of Fig. 1.

In Fig. 1, the inside at the length direction two ends of the gas-tight container 11 quartz glass system with ultraviolet penetrability, that be formed with discharge space 10 disposes to devices spaced apart the electrode 121,122 that is for example formed by the tungsten material.Gas-tight container 11 is that 27.5mm, wall thickness m are that 2.25mm, emission wavelength L are that the mono-layer tube of 2000mm constitutes by for example external diameter φ.

Electrode 121,122 is welded on the end of molybdenum foil 141,142 by lead 131,132 respectively.One end of not shown outer lead is welded on the other end of molybdenum foil 141,142.The lead 131,132 of gas-tight container 11 gas-tight container 11 to outer lead one end is heated, with the part sealing of molybdenum foil 141,142.

In addition, molybdenum foil 141,142, so long as the material close with the coefficient of thermal expansion of the quartz glass that forms gas-tight container 11 get final product, but conduct is suitable for the material of this condition, uses general molybdenum.

The outer lead that one end is connected with molybdenum foil 141,142 respectively, and is connected with not shown power circuit lead 161,162 insulated enclosures of its power supply usefulness that is electrically connected in the inside of the plug 151,152 of for example ceramic with thermal endurance and insulating properties.

In gas-tight container 11, the inert gas of enclosing pilot arc discharge usefulness as enclosing thing is the argon gas 1.3kPa of q.s, and encloses mercury and make that sending the metal that ultraviolet uses is iron, mercuric iodixde, tin.

As the metal that is used to make luminescence-utraviolet, also can replace mercuric iodixde with mercuric bromide, replace tin with thallium.Also can enclose at least two kinds in iron and tin, indium, bismuth, thallium, the manganese.

As shown in Figure 2, at the outer surface of electrode 121 and 122 s' gas-tight container 11, to form the top be steeple or have round-shaped projection 17.Projection 17 has one at least in the side face direction of gas-tight container 11, but also can form a plurality of as shown in Figure 3.Projection 17 will be in the position of downside at least under the state that is mounted.In the occasion that forms a plurality of projections 17, projection 17 needn't be formed on the same circumference circle, also the position of departing from same circumference circle.In addition, at least one position on the length direction of gas-tight container 11 forms projection 17.When a plurality of positions form projection 17, also can be not on axial the same line.

Projection 17 is different from inclosure things such as inert gas is enclosed in the blast pipe trace of using in the gas-tight container 11 that is called as tip portion (row's mood pipe trace).Set projection 17 is left the height height of the aspect ratio blast pipe trace of gas-tight container 11 outer peripheral faces.In addition, by utilizing the hermetic unit of gas-tight container 11, the blast pipe trace not necessarily needs, and it can be cancelled.

Because the height of projection 17 regulation depends on the position relation with the water-cooled cooling body of lamp, therefore not special provision, but do not consider and should contact with cooling body, should not have influence on other characteristics, preferably about 1～3mm.

By forming projections 17 on gas-tight container 11 surface, when cooling body taking place concern with gas-tight container 11 position contacting, gas-tight container 11 passes through projection 17 and contacts with cooling body.Thus, can suppress the situation that gas-tight container 11 parts are extremely cooled off, can suppress to concentrate on easily the mercury of the gas-tight container 11 of cooling segment and concentrate.Can suppress to concentrate the vapour pressure that is produced because of mercury, the voltage of may command lamp descends, and prevents that the illumination of lamp from descending.

The metal halide lamp of this structure when modulating voltage 2300V, lamp current 10.3A and electric potential gradient D 11.5V/cm being supplied in electrode 121,122, can be emitted near the ultraviolet ray that has high luminous intensity the 365nm.

Fig. 4 is used for illustrating that iron (Fe) is with respect to the key diagram that concerns between different alloy state of the content of tungsten (W) and the melting temperature.

That is to say, the melting temperature that becomes the W before the alloy with iron is 3410 ℃, and the melting temperature of FeW (Fe content is little in W and the Fe alloy) is 1216 ℃, and the melting temperature of Fe2W (Fe content is big in W and the Fe alloy) is 1016 ℃, is about 1/3 with respect to the melting temperature of tungsten monomer.Therefore, when the melting temperature step-down, then the alloying of iron content increase can develop, and near the melanism of the caused electrode of ferrous components will take place ahead of time.

Near the key diagram that Fig. 5 is when the lamp input power when per unit length is 50～160W/cm, the experimental result of uitraviolet intensity describes usefulness the melanism when making iron phase divide 5 phase change for the enclosed volume M (mg/cc) of discharge space volume between 0.001～0.2 and the 365nm.

As can be known from Fig. 5, the enclosed volume M (mg/cc) of iron is 0.001, though melanism does not take place, the ultraviolet light intensity does not meet standard.The enclosed volume M (mg/cc) of iron is many to 0.16 or 0.2 o'clock, though the ultraviolet light intensity reaches standard, melanism has taken place.

The enclosed volume M (mg/cc) of iron was respectively 0.002,0.003,0.15 o'clock, and melanism neither takes place, and the ultraviolet light intensity is conformance with standard also.

Therefore, if iron phase is located at 0.2 for the enclosed volume M (mg/cc) of discharge space volume, then iron produces melanism with regard to the coldest electrode perimeter of savings lamp when lamp cools off.By being located at 0.15, just can prevent melanism with respect to the enclosed volume M (mg/cc) of the iron of discharge space volume.

Illustrated as Fig. 4, many more with respect to the enclosed volume M (mg/cc) of the iron of discharge space volume, the alloy amount of the iron of tungsten electrode just increases.The melting temperature of electrode descends thereupon, and near the iron of gas-tight container 11 inner vaporizations in will lighting a lamp electrode corrodes gas-tight container 11 and the melanism that causes.

Learn that thus the enclosed volume M (mg/cc) of restriction iron can prevent near the melanism the electrode 121,122 of gas-tight container 11, can guarantee the ultraviolet intensity of being radiated.

So, when the lamp input power of per unit length is 50～160W/cm, iron phase is made the relation of 0.002≤M≤0.15 for the enclosed volume of discharge space volume, can suppress melanism.Suppress melanism, in other words, suppress the decline of uitraviolet intensity exactly, just help to prolong the useful life of lamp.

Fig. 6, Fig. 7 are the diagrammatic sketch that the embodiment when metal halide lamp of the present invention being used to have the ultraviolet lamp of water-cooled cooling body describes usefulness, and Fig. 6 is a system construction drawing, and Fig. 7 is Fig. 6 IIa-IIb line cutaway view.

Ultraviolet lamp is made of metal halide lamp 100 and water-cooled unit 200.Metal halide lamp 100 and water-cooled unit 200 are positioned to the predetermined distance of being separated by by dividing

plate

25a, 25b on the plug 151,152 that is installed in metal halide lamp 100.

Water-cooled unit 200 is formed by transparent materials such as quartz glasss cylindraceous, and pipe 21 and be located at the outer tube 22 in its outside in having constitutes two-layer pipe.In being enclosed in, metal halide lamp 100 manages in 21.

Water-cooled unit 200 comes the cooling fluid 24 of recirculated water etc. from the outside by tube connector 23a, the 23b that is located at peripheral end.As shown in Figure 7, from the cooling fluid 24 of tube connector 23a input low temperature, will discharge because of metal halide lamp 100 being cooled off again heated cooling fluid 24 from tube connector 23b.In process,, for example be cooled again from tube connector 23a input, thereby cooling fluid 24 is utilized once more by the drain that metal halide lamp 100 heats by 22 of interior pipes 21, outer tube.

Be coated with the metal oxide film of containing metal oxide at the outer surface of outer tube 22.This metal oxide can be thought of as titanium oxide (TiO ₂), cerium oxide (CeO ₂), zinc oxide (ZnO ₂), tin oxide (SnO ₂), zirconia (ZrO ₂), constitute by more than at least a in these metal oxide films.The metal oxide film component is adjusted to absorption by the wavelength components below the 300nm in the light of metal halide lamp 100 radiation.

And, when from metal halide lamp 100 emitting ultraviolet light, the wavelength components of lining below the absorption of the metal oxide film on outer tube 22 outer surfaces 300nm.Therefore, make ultraviolet ray penetrate water-cooled unit 200, shine on the shone thing of resin etc. for the wavelength region may of the effective 300～430nm of hardening of resin.

But what consider is that to make interior pipe 21 diameters of water-cooled unit 200 be that 32mm, the metal halide lamp 100 when outer tube 22 diameters are 36mm are in the constant situation of water-cooled unit 200 internal powers.

Metal halide lamp used herein even water-cooled also can suppress melanism, therefore can prolong the useful life of lamp, can improve the maintenance of ultraviolet lamp.

Claims

1. metal halide lamp is characterized in that having:

Material by ultraviolet penetrability forms the gas-tight container with bubble-tight discharge space;

Be encapsulated in the described gas-tight container, at the described discharge space metal sparking electrode of a pair of fire resistance of configuration relatively; And

By the inclosure thing that inert gas, mercury and iron and halogen constituted that is enough in the amount of described discharge space pilot arc discharge,

The enclosed volume M (mg/cc) of the iron of described inclosure thing makes the relation of 0.002≤M≤0.15 with respect to the volume of described discharge space.

2. metal halide lamp as claimed in claim 1 is characterized in that, described gas-tight container is configured in the water cooling tube unit, and described water cooling tube unit flows cooling fluid and cools off between the interior pipe of the cooling water pipe that is made of interior pipe and outer tube and outer tube.

3. metal halide lamp as claimed in claim 1 is characterized in that, in the periphery of described gas-tight container, no matter has or not to make the pipe trace that described inclosure thing imports and formed projection.

4. metal halide lamp as claimed in claim 1 is characterized in that, described projection forms than this pipe trace height in the occasion that is formed with described pipe trace.

5. metal halide lamp as claimed in claim 1 is characterized in that, described projection is provided with a plurality of along the length direction of lamp.