EP0871202A2 - Lampe à décharge à halogénure métallique - Google Patents

Lampe à décharge à halogénure métallique Download PDF

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Publication number
EP0871202A2
EP0871202A2 EP98104337A EP98104337A EP0871202A2 EP 0871202 A2 EP0871202 A2 EP 0871202A2 EP 98104337 A EP98104337 A EP 98104337A EP 98104337 A EP98104337 A EP 98104337A EP 0871202 A2 EP0871202 A2 EP 0871202A2
Authority
EP
European Patent Office
Prior art keywords
discharge lamp
metal halide
halide discharge
set forth
satin finish
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Withdrawn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
EP98104337A
Other languages
German (de)
English (en)
Other versions
EP0871202A3 (fr
Inventor
Yasuhisa Yaguchi
Masaomi Mizumoto
Yoshifumi Takao
Toshiyuki Nagahara
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.)
Stanley Electric Co Ltd
Original Assignee
Stanley Electric Co Ltd
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
Priority claimed from JP09385697A external-priority patent/JP3150918B2/ja
Application filed by Stanley Electric Co Ltd filed Critical Stanley Electric Co Ltd
Publication of EP0871202A2 publication Critical patent/EP0871202A2/fr
Publication of EP0871202A3 publication Critical patent/EP0871202A3/fr
Withdrawn legal-status Critical Current

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    • 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

Definitions

  • the present invention relates to a discharge lamp and, in particular, a discharge lamp in which metal halide is added into mercury vapor for improving color rendering property.
  • FIG. 3 shows a construction of a metal halide discharge lamp of prior art.
  • a metal foil leading-in wire 93 made of molybdenum etc. is held and sealed by thermally deforming the bulb 91.
  • the use of the metallic foil leading-in wire permits an increase of surface area as a conductive material and a reduction in pressure of the discharge room 91a per unit area.
  • both are merely in contact with a flat surface as shown in FIG. 4.
  • thermal stresses of temperature rise and fall due to the repetitive lighting and lighting-off a contact between the two becomes gradually loose, leading to leaks.
  • Japanese Patent Publication No. Hei. 5-3703 describes a construction where sealing is performed by deposing a conductive material of round bar on a bulb by using a frit.
  • a round bar shaped conductive material displays a disadvantage that the ratio of the surface area to the volume, i.e., the ratio of the periphery to the sectional area, becomes small. Since the sectional area requires a specified value according to the discharge current value, if the periphery length is small for the same sectional area, the pressure of a discharge room applied per unit length is increased. Accordingly, for the whole conductive material, the pressure of the discharge room per unit area is increased, which is disadvantageous in preventing leaks.
  • the frit is interposed for increasing the adhesive strength between a bulb and a conductive material, the frit is melted at the time of sealing to deposit on the bulb and the conductive material. Therefore, at this melting, impurities contained in the frit or the composition of the frit evaporate and then enter the discharge room to damage discharge lamp properties.
  • a metal halide discharge lamp comprising a metal foil leading-in wire held and sealed by a thermally deformed glass bulb, characterized in that at least one of surfaces of the metal foil leading-in wire are furnished with a satin finish.
  • the metal halide discharge lamp including the metallic foil leading-in wire with the satin finished both surfaces that is held and sealed by a bulb is free from the problem of prior art that the lift time of halide discharge lamps is reduced depending upon the number of lighting and lighting-off. It is therefore possible to apply to cases where flickering is made frequently, e.g., head lamps of automobiles, to expand the use of metal halide discharge lamps of this type, and to improve the reliability.
  • the satin finish by a sand blasting finish using corundum abrasive grains or an electric field deposition using a melted metallic salt prevents matters which will be harmful by heating for sealing with a bulb from entering the discharge room. This avoids an additional step, e.g., elimination of remaining abrasive grains, and facilitates to practice the discharge lamp of the present invention, without causing no cost rise.
  • FIG. 1 is a sectional view of a metal halide discharge lamp according to a preferred embodiment of the present invention.
  • FIG. 2 is a sectional view along line A-A of FIG. 1.
  • FIG. 3 is a sectional view of a metal halide discharge lamp of prior art.
  • FIG. 4 is a sectional view along line B-B of FIG. 3.
  • reference numeral 1 indicates a metal halide discharge lamp according to one embodiment of the present invention.
  • a metal foil leading-in wire 4 made of molybdenum is employed as a conductive material so as to produce a greater surface area for sectional area, in order that the gastightness of a discharge room 2a is maintained when performing a feeding from the exterior to a discharging electrode 3 disposed in the discharge room 2a of a bulb 2.
  • metal foil leading-in wire 4 Metal materials as a material of the metal foil leading-in wire 4 are supplied in the market after they are formed, e.g., by means of rolling, into the form of foil (plate) by manufacturers so as to have a specified thickness, and further treated to have a fairly smooth surface, i.e., flaw-free, for increasing their commercial value.
  • the present invention is directed to obtain a peripheral length greater than that defined by the sectional shape of a metal foil leading-in wire 4 by providing a satin finish 4a on at least one of the surfaces of the aforesaid metal material to produce fine irregularities thereon, as shown in FIG. 2.
  • satin finish 4a As a first means, there is a manner executed by mechanical means, such as sand blasting, in which abrasive grains that are fine powders of a material having an appropriate hardness are sprayed and collided on the surface of a metal foil leading-in wire 4 or of a metal material that is a material to form the metal foil leading-in wire 4.
  • mechanical means such as sand blasting, in which abrasive grains that are fine powders of a material having an appropriate hardness are sprayed and collided on the surface of a metal foil leading-in wire 4 or of a metal material that is a material to form the metal foil leading-in wire 4.
  • silicon carbide As abrasive grains of this type, silicon carbide (SiC), hereinafter referred to as carborundum, is generally employed because of its outstanding work efficiency in addition to its hardness.
  • SiC silicon carbide
  • carborundum silicon carbide
  • the abrasive grains of silicon carbide have high hardness, they are strongly cut into the metal foil leading-in wire 4. It is therefore very difficult to eliminate the remaining abrasive grains on the surface after a sand blasting. The remaining abrasive grains sublime at the step of sealing, adhere to a discharging electrode 3 and disappear, which will then make the surface black.
  • alumina Al 2 O 3
  • corundum alumina
  • the present invention employs alumina as an abrasive grain. This avoids a step of eliminating such remaining abrasive grains as described above to reduce the number of steps as a whole.
  • a satin finish 4a there is chemical means, such as an electric field deposition using a melted metallic salt.
  • chemical means such as an electric field deposition using a melted metallic salt.
  • the following description is made taking an example of molybdenum but not limited to this alone.
  • Other metals or metal mixtures are useable for the metal foil leading-in wire 4.
  • molybdenum chloride MoCl 5
  • MoCl 5 molybdenum chloride having a low melting point
  • molybdenum chloride is melted in a crucible under an argon atmosphere and then subjected to an electric field deposition by using molybdenum as an electrode.
  • the molybdenum is deposited in a manner of (Mo 5+ +5e - ⁇ Mo) on a cathode side, and therefore, by forming a metal foil lead-in wire 4 with this deposited molybdenum as a material, it is possible to obtain the metal foil leading-in wire 4 that has an increased surface area due to fine irregularities on the surface, i.e., a satin finish 4a, as in the case of a sand blasting.
  • the molybdenum electrode on an anode side is in the state of (Mo ⁇ Mo 5+ +5e - ), i.e., a state where electrical corrosion has been caused, thereby producing fine irregularities in the same manner. It is therefore possible to use as a material of a metal foil leading-in wire 4 that has a great surface area as in that of the cathode. It should be noted that no abrasive grain is required in this manner and thus requires no step of eliminating remaining abrasive grains.
  • test samples of the satin finish 4a having a different surface roughness were prepared and their surface roughnesses were measured according to JIS B0601(1982) standards, in order to obtain an optimum range of surface roughness.
  • Ra arithmetical mean deviation of profile
  • Rz ten point height of irregularities
  • the arithmetical means deviation of profile is defined as 0.25 ⁇ Ra ⁇ 0.8( ⁇ m) and the ten point height of irregularities is defined as 1.1 ⁇ Rz ⁇ 4.5( ⁇ m).
  • metal halide discharge lamps of the present invention that suppress a reduction in life time due to repetitive lighting and lighting-off, are extremely useful because in recent years, metal halide discharge lamps have been finding their ways into uses where lighting and lighting-off are more frequent than that of conventional lamps for lighting, e.g., head lamps for automobiles, light sources for projection type television receiving sets.

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  • Vessels And Coating Films For Discharge Lamps (AREA)
EP98104337A 1997-04-11 1998-03-11 Lampe à décharge à halogénure métallique Withdrawn EP0871202A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP93856/97 1997-04-11
JP09385697A JP3150918B2 (ja) 1996-08-16 1997-04-11 メタルハライド放電灯

Publications (2)

Publication Number Publication Date
EP0871202A2 true EP0871202A2 (fr) 1998-10-14
EP0871202A3 EP0871202A3 (fr) 1999-02-10

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP98104337A Withdrawn EP0871202A3 (fr) 1997-04-11 1998-03-11 Lampe à décharge à halogénure métallique

Country Status (1)

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EP (1) EP0871202A3 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2338823A (en) * 1998-06-26 1999-12-29 Koito Mfg Co Ltd Arc tube and fabricating method thereof
NL1015467C2 (nl) * 1999-06-25 2001-05-04 Koito Mfg Co Ltd Boogbuis en vervaardigingswijze daarvoor.
EP1156505A1 (fr) * 2000-05-18 2001-11-21 PLANSEE Aktiengesellschaft Procédé de production d'une lampe électrique
DE10031182B4 (de) * 1999-06-28 2007-11-22 Koito Manufacturing Co., Ltd. Bogenentladungsröhre mit Restdruckbelastungsschicht für eine Entladungslampeneinheit und Verfahren zur Herstellung derselben
EP1981061A1 (fr) * 2006-01-26 2008-10-15 Harison Toshiba Lighting Corporation Lampe aux halogenures metalliques
WO2008132123A2 (fr) 2007-04-27 2008-11-06 Osram Gesellschaft mit beschränkter Haftung Procédé de fabrication d'une feuille de molybdène pour la construction de lampes, feuille de molybdène, et lampe comportant la feuille de molybdène
EP2086002A2 (fr) 2004-09-30 2009-08-05 Koninklijke Philips Electronics N.V. Lampe électrique avec feuille de scellage
DE10241398B4 (de) * 2001-09-07 2013-06-13 Koito Manufacturing Co., Ltd. Verfahren zur Herstellung einer Bogenentladungsröhre für eine Entladungslampe

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2227511A (en) * 1937-08-30 1941-01-07 Thermal Syndicate Ltd Seal and method of making the same
GB780614A (en) * 1955-02-23 1957-08-07 British Thomson Houston Co Ltd Quartz-to-metal seals
JPS5964548A (ja) * 1982-09-30 1984-04-12 Toshiba Corp 封着部材
US4587454A (en) * 1984-05-17 1986-05-06 Gte Products Corporation Incandescent lamp with improved press seal

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2227511A (en) * 1937-08-30 1941-01-07 Thermal Syndicate Ltd Seal and method of making the same
GB780614A (en) * 1955-02-23 1957-08-07 British Thomson Houston Co Ltd Quartz-to-metal seals
JPS5964548A (ja) * 1982-09-30 1984-04-12 Toshiba Corp 封着部材
US4587454A (en) * 1984-05-17 1986-05-06 Gte Products Corporation Incandescent lamp with improved press seal

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 008, no. 162 (C-235), 26 July 1984 & JP 59 064548 A (TOSHIBA KK), 12 April 1984 *

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19928996B4 (de) * 1998-06-26 2009-04-02 Koito Mfg. Co., Ltd. Verfahren zur Herstellung eines Lichtbogenrohrs
GB2338823B (en) * 1998-06-26 2001-06-13 Koito Mfg Co Ltd Method of fabricating an arc tube
US6354900B1 (en) 1998-06-26 2002-03-12 Koito Manufacturing Co., Ltd. Arc tube and fabricating method thereof
NL1012447C2 (nl) * 1998-06-26 2004-08-19 Koito Mfg Co Ltd Boogbuis en werkwijze voor het vervaardigen daarvan.
GB2338823A (en) * 1998-06-26 1999-12-29 Koito Mfg Co Ltd Arc tube and fabricating method thereof
NL1015467C2 (nl) * 1999-06-25 2001-05-04 Koito Mfg Co Ltd Boogbuis en vervaardigingswijze daarvoor.
US6891332B1 (en) 1999-06-25 2005-05-10 Koito Manufacturing Co., Ltd. Arc tube capable of preventing occurrence of leak due to cracks and manufacturing method therefore
DE10030808B4 (de) * 1999-06-25 2006-03-23 Koito Mfg. Co., Ltd. Bogenentladungsröhre und Verfahren zu ihrer Herstellung
DE10031182B4 (de) * 1999-06-28 2007-11-22 Koito Manufacturing Co., Ltd. Bogenentladungsröhre mit Restdruckbelastungsschicht für eine Entladungslampeneinheit und Verfahren zur Herstellung derselben
EP1156505A1 (fr) * 2000-05-18 2001-11-21 PLANSEE Aktiengesellschaft Procédé de production d'une lampe électrique
US6753650B2 (en) 2000-05-18 2004-06-22 Plansee Aktiengesellschaft Method for producing an electric lamp and foil configuration
DE10241398B4 (de) * 2001-09-07 2013-06-13 Koito Manufacturing Co., Ltd. Verfahren zur Herstellung einer Bogenentladungsröhre für eine Entladungslampe
US7888872B2 (en) 2004-09-30 2011-02-15 Koninklijke Philips Electronics N.V. Electric lamp
EP2086002A2 (fr) 2004-09-30 2009-08-05 Koninklijke Philips Electronics N.V. Lampe électrique avec feuille de scellage
EP2107595A2 (fr) 2004-09-30 2009-10-07 Koninklijke Philips Electronics N.V. Lampe électrique et feuille métallique
EP1981061A4 (fr) * 2006-01-26 2010-06-16 Harison Toshiba Lighting Corp Lampe aux halogenures metalliques
US8203271B2 (en) 2006-01-26 2012-06-19 Harison Toshiba Lighting Corporation Metal halide lamp including sealed metal foil
EP1981061A1 (fr) * 2006-01-26 2008-10-15 Harison Toshiba Lighting Corporation Lampe aux halogenures metalliques
DE102007020067A1 (de) * 2007-04-27 2008-11-06 Osram Gesellschaft mit beschränkter Haftung Verfahren zur Herstellung einer Molybdänfolie für den Lampenbau und Molybdänfolie sowie Lampe mit Molybdänfolie
WO2008132123A3 (fr) * 2007-04-27 2009-04-16 Osram Gmbh Procédé de fabrication d'une feuille de molybdène pour la construction de lampes, feuille de molybdène, et lampe comportant la feuille de molybdène
WO2008132123A2 (fr) 2007-04-27 2008-11-06 Osram Gesellschaft mit beschränkter Haftung Procédé de fabrication d'une feuille de molybdène pour la construction de lampes, feuille de molybdène, et lampe comportant la feuille de molybdène
US8408961B2 (en) 2007-04-27 2013-04-02 Osram Gesellschaft Mit Beschraenkter Haftung Method for producing a molybdenum film for the construction of a lamp and molybdenum film and lamp with molybdenum film
DE102007020067B4 (de) * 2007-04-27 2013-07-18 Osram Gmbh Verfahren zur Herstellung einer Molybdänfolie für den Lampenbau und Molybdänfolie sowie Lampe mit Molybdänfolie
CN101663729B (zh) * 2007-04-27 2014-07-09 奥斯兰姆有限公司 制造用于构造灯的钼薄膜的方法和钼薄膜以及具有钼薄膜的灯

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