EP1811541A2 - Entladungslampe mit Quecksilber - Indiumiodid - Füllung - Google Patents

Entladungslampe mit Quecksilber - Indiumiodid - Füllung Download PDF

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Publication number
EP1811541A2
EP1811541A2 EP07001082A EP07001082A EP1811541A2 EP 1811541 A2 EP1811541 A2 EP 1811541A2 EP 07001082 A EP07001082 A EP 07001082A EP 07001082 A EP07001082 A EP 07001082A EP 1811541 A2 EP1811541 A2 EP 1811541A2
Authority
EP
European Patent Office
Prior art keywords
hermetically sealing
discharge lamp
tube part
arc tube
lamp according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP07001082A
Other languages
English (en)
French (fr)
Other versions
EP1811541A3 (de
Inventor
Akira Ishikura
Yoshiteru Nose
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ushio Denki KK
Original Assignee
Ushio Denki KK
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ushio Denki KK filed Critical Ushio Denki KK
Publication of EP1811541A2 publication Critical patent/EP1811541A2/de
Publication of EP1811541A3 publication Critical patent/EP1811541A3/de
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/12—Selection of substances for gas fillings; Specified operating pressure or temperature
    • H01J61/125—Selection of substances for gas fillings; Specified operating pressure or temperature having an halogenide as principal component
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/36—Seals between parts of vessels; Seals for leading-in conductors; Leading-in conductors
    • H01J61/366—Seals for leading-in conductors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/82—Lamps with high-pressure unconstricted discharge having a cold pressure > 400 Torr
    • H01J61/827—Metal halide arc lamps

Definitions

  • the invention relates to a discharge lamp which emits blue light and is used for illuminating water tanks.
  • Lamps are known for illuminating water tanks which emit blue light by using indium as the emission material, so that beautiful colours of fish and colours of corals, sea algae and the like can be displayed in a brilliant fashion (see JP-A HEI 11-67148 for example).
  • Recently, tropical fish are generally observed by families, with a lamp for illuminating water basins as shown in JP-A HEI 11-67148 for example being arranged and used above a water tank.
  • the arc tube consists of silica glass in the aforementioned lamp for illuminating water tanks, at the two ends of which there is a hermetically sealing tube each being produced by melting and compressing silica glass.
  • the internal volume is close to 2 cm 3 .
  • the lamp is operated at 150 W.
  • the coolest point of the arc tube has 700 °C to 800 °C.
  • Fig. 6 shows an arrangement of an example of the aforementioned lamp for the illumination of a water tank by using silica glass for the arc tube.
  • a pair of electrodes 21 is arranged within the arc tube consisting of silica glass.
  • a hermetically sealing tube 12 with a compressed structure is formed at each of the two ends of the arc tube 11.
  • the electrodes 21 are each connected via a molybdenum foil 29 to the outer leads 24, which foil is placed in the hermetically sealing tube 12.
  • Mercury and indium iodide are filled into the arc tube 11.
  • a lamp is conventionally used as a lamp emitting blue light in which mercury and indium iodide are filled into a bulb consisting of silica glass and which is operated with approximately 150 W.
  • the discharge can no longer be maintained in the case of an excessive reduction of the voltage.
  • the reduction of the voltage therefore has limits. In reality, the power can be reduced by 1 percent at most, but not more.
  • the coolest point of the arc tube still has a lower temperature than the lamp shown in JP-A HEI 11-67148 as a result of the structural correlation of the hermetically sealing tube with a compressed structure of the arc tube, but it still has approximately 700 °C.
  • the material filled into the arc tube evaporates to a high extent in relation to the small internal volume of the arc tube because the temperature of the coolest point lies close to approximately 700 °C.
  • the ratio of the evaporated indium which is filled into the arc tube is high.
  • a small quantity of indium is sufficient.
  • the radiation with 451 nm which represents the main emission line (peak) of the indium emission is no longer emitted as a result of self-absorption or a radiation with approximately 451 nm becomes a continuous emission.
  • the blue colour of the emitted light will become brighter up to nearly white.
  • the quantity of indium iodide is approximately 0.1 mg, as is described in this specification. Since it is an exceptionally small quantity, indium is usually filled in by filling pellet-like indium iodide into the arc tube. In the case of a lamp with an output of less than/equal to 150 W, the quantity of the indium to be filled in is smaller than the same. The currently used smallest pellet comprises approx. 0.05 mg.
  • the invention was made to eliminate the disadvantages of the state of the art as described above. It is the object of the present invention to provide a discharge lamp with a small power consumption in which indium is used as the emission material and which emits blue light.
  • a lamp with an arc tube made of glass usually comprises at either end of the arc tube a hermetically sealing tube with a compressed structure, as was shown above by reference to Fig. 6.
  • a lamp is known as shown in Fig. 1 (a) and (b) in which on the two sides of the arc tube there is a hermetically sealing tube each in the form of a rod-like tube.
  • a discharge lamp by using a translucent ceramic material it is not possible to seal by melting as is the case with glass.
  • a lamp is thus usually used with the arrangement as shown in Fig. 1 (a) and (b).
  • the inventors have produced a discharge lamp with a low power consumption which emits blue light by using a lamp with the shape as shown above by reference to Fig. 1 (a) and (b). They have found that an emission of blue light will occur even then when the filling quantity of the indium iodide is increased more than when using a lamp of the shape as shown in Fig. 6.
  • the filled indium iodide remains mostly in the region of a lower temperature of the hermetically sealing rod-like tubes on both sides.
  • the quantity of the indium iodide which is present in the arc tube is smaller than/equal to the reciprocal of the multiple quantity of the filled indium iodide.
  • an arc tube part and hermetically sealing tube parts in the form of rod-like tubes are arranged which are integrally adjacent to the arc tube part, and that further electrode structural bodies whose tips contain the aforementioned electrodes are pushed into the hermetically sealed tube parts, each with a gap towards the inside wall of the hermetically sealed tube part, and that in the lamp in which an air-tight sealing structure is formed between the region on the side of the outside end of said hermetically sealing tube part and the electrode structural body, and that mercury and indium iodide are filled in, blue light can be emitted in a stable fashion even in the case of a larger filling quantity of the indium iodide as compared with a conventional lamp with hermetically sealing tubes which are produced by melting of silica glass and by compression of the same.
  • a correct quantity can be filled into the arc tube without comminution of the indium iodide pellets. It is thus enabled to produce in a relatively simple way a discharge lamp with a low power consumption which performs an emission in the blue colour and which conventionally was very difficult to produce.
  • Figs. 1 (a) and (b) each show a schematic representation of an arrangement of an embodiment of a discharge lamp in accordance with the invention which is made of ceramic material and which is operated by using alternate current and is arranged as a metal halide lamp.
  • Fig. 1 (a) shows a cross-sectional view.
  • Fig. 1 (b) shows a schematic representation of a boundary region between its arc tube and its hermetically sealing tube on an enlarged scale.
  • the bulb 10 comprises a substantially spherical arc tube part 11 which encloses a discharge space S and hermetically sealing rod-like tube parts 12 which are adjacent to the two ends of said arc tube part 11 in the manner that they project outwardly from the same.
  • the bulb 10 consists of a translucent ceramic material.
  • a body made of polycrystalline translucent aluminium oxide, polycrystalline translucent yttrium aluminium garnet or polycrystalline translucent yttrium oxide can be used as the ceramic material which bulb 10 consists of.
  • a body of polycrystalline aluminium oxide is especially advantageous.
  • the maximum outside diameter of the arc tube part 11 usually is 5.0 to 8.5 mm in the bulb 10, the internal volume is 0.07 cm 3 to 0.23 cm 3 , the outside diameter of the hermetically sealing tube part 12 is 1.5 mm to 2.5 mm, the inside diameter is 0.7 mm to 0.9 mm and the length is 6 mm to 12 mm.
  • Electrode 21 is formed in the example as shown in Figs. 1 (a) and (b) in such a way that the tip region of an electrode rod 22 is wound with a metallic coil.
  • An outer lead 24 extending in the same direction is integrally connected with the base of the electrode rod 22 via a rod-like metal ceramic 23 which extends in the same direction as the electrode rod 22 and is electrically connected to the same.
  • Tungsten or the like is used for the electrode rod 22 and the metallic coil.
  • Molybdenum or the like is used for the outer lead 24.
  • the electrode rod 22 is inserted into a sleeve 26 made of ceramic material.
  • a body made of polycrystalline aluminium oxide, silica glass or the like can be used for the material of said sleeve 26. It is advantageous however that it should consist of the same material as the bulb 10. It is desirable that the outside diameter of the sleeve 26 corresponds to the inside diameter of the hermetically sealing tube part 12 and that at the same time the inside diameter thereof corresponds with the outside diameter of the electrode rod 22.
  • the difference between the outside diameter of the sleeve 26 and the inside diameter of the hermetically sealing tube 12 normally is 0.03 mm to 0.10 mm and the difference between the inside diameter of the sleeve 26 and the outside diameter of the electrode rod 22 is 0.03 mm to 0.07 mm.
  • Fig. 2 (a) one can also make an arrangement in which the electrode rod 22 is inserted into the sleeve 26 and in which the electrode rod 22 is tightly wound with a coil 27 made of tungsten on the electrode side of the sleeve 26.
  • an arrangement can also be provided in which an outer lead 28 made of niobium is connected to the end of the electrode rod 22, in which no sleeve component is used, in which the electrode rod 22 is wound around with a coil 27 made of tungsten and in which sealing is made hermetically with frit glass 30 without using a metal ceramic material.
  • an electrode structural body made of the electrode rod 22 and the sleeve 26 is pushed into the hermetically sealing tube part 12 of the bulb 10.
  • the electrode rod 22 and the sleeve 26 are inserted concretely in such a way into the hermetically sealing tube part 12 that the electrode 21 is located in the arc tube part 11.
  • an annular frit glass 30 is attached between the metal ceramic 23 and the outside end of the hermetically sealing tube part 12. The frit glass is heated and molten in this state, as a result of which an air-tight sealing arrangement is produced in the region on the side of the outside end of the hermetically sealing tube part.
  • the electrode structural body made of electrode rod 22 and sleeve 26 comprises a gap k towards the inside wall of the hermetically sealing tube part 12.
  • the distance of the gap K between the boundary between the arc tube part 11 and the hermetically sealing tube part 12 and the end of the frit glass 30 which represents the inside boundary of the air-tight sealing arrangement within the hermetically sealing tube part 11 is designated with L (mm).
  • Frit glass 30 for the hermetical sealing can advantageously be used on the basis of an oxide of aluminium oxide/silicon oxide/rare earths or frit glass on the basis of aluminium oxide/CaO.
  • Such a discharge lamp made of ceramic material can be operated by regulating the current and the voltage with a lower power consumption, e.g. with less than/equal to 50 W.
  • the specifications of the lamps described above with power consumptions of 20 W and 50 W are stated below.
  • Mercury 2.0 mg Indium iodide (Inl): 0.1 mg 0.078 cm 3 1.28 mg/cm 3 25.6 mg/cm 3 50 W, 90 V, 0.6
  • the hermetically sealing tube parts cannot be subjected to any melting deformation during the process of producing the air-tight sealing arrangement in the hermetically sealing tube part because the bulb consists of a translucent ceramic material.
  • the gap between the hermetically sealing tube part and the electrode structural body inserted therein is therefore filled with the frit glass 30 for hermetical sealing, as a result of which the air-tight sealing arrangement is produced.
  • the gap K between the electrode structural body and the inside wall of the hermetically sealing tube part 12 is formed.
  • the frit glass 30 does not have a sufficiently high heat resistance temperature, an overheated state during the operation of the discharge lamp must be avoided.
  • a hermetically sealing tube part of a suitable length adjacent to the arc tube part is required in the hermetically sealing tube part of the discharge lamp made of ceramic material in order to insulate the middle section of the arc tube part which reaches an exceptionally high temperature during operation from the air-tight sealing section.
  • the gap K between the electrode structural body and the inside wall of the hermetically sealing tube part 12 is narrow.
  • the coolest point of the arc tube has a lower temperature in the vicinity adjacent to the hermetically sealing tube part 11 as a result of the structural correlation between such a hermetically sealing tube part and the arc tube part than the coolest point of a conventional discharge lamp (approximately 700 °C), specifically 600 °C.
  • the temperature is lower than the coolest point of the conventional lamp made of silica glass with hermetically sealing tubes with a compressed structure.
  • the mercury and the indium which are filled into the arc tube therefore influence the temperature of the coolest point, so that in comparison with conventional lamps made of silica glass less of it is evaporated.
  • the filling quantity of the indium needs to be enlarged as a result of the difficult evaporation.
  • a narrow gap is formed within the hermetically sealing tube part between the tube part and the electrode structural body.
  • a suitable quantity of indium can be filled into the arc tube in the case of a ceramic discharge lamp with a temperature of less than/equal to 700 °C of the coolest point of the arc tube part and a lamp is thus obtained which reliably emits blue light and a line spectrum at 451 nm.
  • the filling quantity of indium iodide is close to 0.1 mg for example in the lamp described above by reference to Table 1 and is thus equivalent to the conventional discharge lamp made of silica glass with approximately 150 W.
  • the mercury filled into the arc tube regulates the inside pressure within the arc tube, as a result of which a voltage state is achieved in which the arc discharge can be maintained, ensuring that the current value is set to the predetermined range.
  • the relation between the filling quantity of mercury and the filling quantity of indium iodide was examined by a test. Moreover, the relation of length L of the gap of the hermetically sealing tube part was examined (distance from the boundary between the arc tube part and the hermetically sealing tube part and the inner boundary of the air-tight sealing arrangement within the hermetically sealing tube part; see Fig. 1 (b)). In this test, the test was performed by using the metal halide lamps which are shown in Table 1 and consist of a ceramic material and are of the 20 W/50 W type. The inside diameter of the arc tube and the materials filled into the arc tube are shown in Table 1.
  • the filling quantity of the indium iodide was chosen from 0.15 mg, 0.1 mg or 0.05 mg, the filling quantity of the mercury was changed according to output and the test was performed. In this test, the colouring of the emitted light after 500 hours of examination and the state of the arc tube were examined. The result is shown in Figs. 3 to 5. At a value of mercury (mg) / indium iodide (mg) of 150, the filling quantity of mercury was 7.5 mg and voltage increased to 60 W. This result is also shown in Fig. 5.
  • the frit glass from which the air-tight sealing arrangement is formed is moved too close to the arc tube, with the length (gap length L) lying closer than 3 mm in lamp 1 from the boundary between the arc tube part and the hermetically sealing tube part towards the inner boundary of the air-tight sealing arrangement within the hermetically sealing tube part.
  • the filling quantity of indium iodide is smaller than the filling quantity of the mercury at a filling quantity of the indium iodide of 0.05 mg.
  • the quantity of the indium iodide decreases in lamps 2 to 11, so that also the quantity of the halogen (iodine) present within the arc tube will decrease.
  • the halogen cycle within the arc tube becomes insufficient and the arc tube will be blackened. Since further the indium quantity will decrease within the arc tube, the emitted light has a stronger white colour, namely a blue colouring which is approximated to white. No expected colouring is obtained.
  • the filling quantity of mercury is smaller than indium iodide.
  • the quantity of indium iodide will be relatively large, so that the quantity of the indium present within the arc tube will increase.
  • the radiation close to 451 nm will become a continuous emission and the blue colour of the emitted light will become brighter.
  • the gap within the hermetically sealing tube part will become too large, into which indium will penetrate in the state of indium iodide.
  • the quantity of the halogen (iodine) present within the arc tube will decrease.
  • the halogen cycle within the arc tube will become insufficient and the arc tube will be blackened.
  • the blackening of the arc tube reduces the light flux of the lamp, leading to the disadvantage of a reduction of the illuminance in the illumination area.

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  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Discharge Lamp (AREA)
  • Discharge Lamps And Accessories Thereof (AREA)
EP07001082A 2006-01-19 2007-01-18 Entladungslampe mit Quecksilber - Indiumiodid - Füllung Withdrawn EP1811541A3 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2006010851A JP2007194066A (ja) 2006-01-19 2006-01-19 放電ランプ

Publications (2)

Publication Number Publication Date
EP1811541A2 true EP1811541A2 (de) 2007-07-25
EP1811541A3 EP1811541A3 (de) 2011-03-30

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ID=37896080

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Application Number Title Priority Date Filing Date
EP07001082A Withdrawn EP1811541A3 (de) 2006-01-19 2007-01-18 Entladungslampe mit Quecksilber - Indiumiodid - Füllung

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EP (1) EP1811541A3 (de)
JP (1) JP2007194066A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104299884A (zh) * 2014-11-03 2015-01-21 广东雪莱特光电科技股份有限公司 一种蓝色高强度气体放电灯

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015153602A (ja) * 2014-02-14 2015-08-24 株式会社Ｇｓユアサ 高圧放電ランプ

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62276740A (ja) * 1986-05-26 1987-12-01 Iwasaki Electric Co Ltd 可視光硬化用メタルハライドランプ
JPH07240184A (ja) * 1994-02-28 1995-09-12 Toshiba Lighting & Technol Corp セラミック放電灯およびこれを用いた投光装置ならびにセラミック放電灯の製造方法
JPH08115704A (ja) * 1994-10-13 1996-05-07 Japan Storage Battery Co Ltd メタルハライドランプ
US6465940B1 (en) * 1998-07-09 2002-10-15 Ushiodenki Kabushiki Kaisha Cermet and ceramic discharge lamp
US20040104677A1 (en) * 2002-08-30 2004-06-03 Shunsuke Kakisaka Metal vapor discharge lamp and lighting apparatus capable of stable maintenance of characteristics
JP2004213915A (ja) * 2002-12-27 2004-07-29 Iwasaki Electric Co Ltd 高演色水槽用メタルハライドランプ
US20040189212A1 (en) * 2003-03-03 2004-09-30 Osram-Melco Toshiba Lighting Ltd. High-intensity discharge lamp and related lighting device
JP2005203177A (ja) * 2004-01-14 2005-07-28 Osram Melco Toshiba Lighting Kk 高圧放電ランプおよび照明装置

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5353172A (en) * 1976-10-25 1978-05-15 Mitsubishi Electric Corp Metal halide lamp
JPH0721981A (ja) * 1993-07-05 1995-01-24 Matsushita Electron Corp メタルハライドランプ
JPH1167148A (ja) * 1997-08-08 1999-03-09 Iwasaki Electric Co Ltd メタルハライドランプ
JP2003132848A (ja) * 2002-02-18 2003-05-09 Toto Ltd 高圧放電灯及び照明装置

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62276740A (ja) * 1986-05-26 1987-12-01 Iwasaki Electric Co Ltd 可視光硬化用メタルハライドランプ
JPH07240184A (ja) * 1994-02-28 1995-09-12 Toshiba Lighting & Technol Corp セラミック放電灯およびこれを用いた投光装置ならびにセラミック放電灯の製造方法
JPH08115704A (ja) * 1994-10-13 1996-05-07 Japan Storage Battery Co Ltd メタルハライドランプ
US6465940B1 (en) * 1998-07-09 2002-10-15 Ushiodenki Kabushiki Kaisha Cermet and ceramic discharge lamp
US20040104677A1 (en) * 2002-08-30 2004-06-03 Shunsuke Kakisaka Metal vapor discharge lamp and lighting apparatus capable of stable maintenance of characteristics
JP2004213915A (ja) * 2002-12-27 2004-07-29 Iwasaki Electric Co Ltd 高演色水槽用メタルハライドランプ
US20040189212A1 (en) * 2003-03-03 2004-09-30 Osram-Melco Toshiba Lighting Ltd. High-intensity discharge lamp and related lighting device
JP2005203177A (ja) * 2004-01-14 2005-07-28 Osram Melco Toshiba Lighting Kk 高圧放電ランプおよび照明装置

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104299884A (zh) * 2014-11-03 2015-01-21 广东雪莱特光电科技股份有限公司 一种蓝色高强度气体放电灯
CN104299884B (zh) * 2014-11-03 2017-06-20 广东雪莱特光电科技股份有限公司 一种蓝色高强度气体放电灯

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EP1811541A3 (de) 2011-03-30
JP2007194066A (ja) 2007-08-02

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