EP2197021A1 - Stromzuführungselement für eine Elektrode und Elektrodengestell mit zumindest einem derartigen Stromzuführungselement - Google Patents

Stromzuführungselement für eine Elektrode und Elektrodengestell mit zumindest einem derartigen Stromzuführungselement Download PDF

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Publication number
EP2197021A1
EP2197021A1 EP08171190A EP08171190A EP2197021A1 EP 2197021 A1 EP2197021 A1 EP 2197021A1 EP 08171190 A EP08171190 A EP 08171190A EP 08171190 A EP08171190 A EP 08171190A EP 2197021 A1 EP2197021 A1 EP 2197021A1
Authority
EP
European Patent Office
Prior art keywords
power supply
supply element
amalgam
electrode
element 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Withdrawn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
EP08171190A
Other languages
German (de)
English (en)
French (fr)
Inventor
Giancarlo De Villagomez
Gerald Hämmer
Thomas Noll
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.)
Osram GmbH
Osram SpA
Original Assignee
Osram GmbH
Osram SpA
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 Osram GmbH, Osram SpA filed Critical Osram GmbH
Priority to EP08171190A priority Critical patent/EP2197021A1/de
Priority to CN200910253435A priority patent/CN101752186A/zh
Priority to JP2009280903A priority patent/JP2010140904A/ja
Publication of EP2197021A1 publication Critical patent/EP2197021A1/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Withdrawn legal-status Critical Current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
    • H01J61/04—Electrodes; Screens; Shields
    • H01J61/06—Main electrodes
    • H01J61/067—Main electrodes for low-pressure discharge lamps
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/24—Means for obtaining or maintaining the desired pressure within the vessel
    • H01J61/28—Means for producing, introducing, or replenishing gas or vapour during operation of the lamp

Definitions

  • the invention relates to a power supply element for an electrode, which is elongated. Furthermore, the invention also relates to an electrode frame with such power supply elements, wherein the electrode frame is designed for a discharge lamp.
  • the starting amalgam is located on a, preferably designed as a metal sheet or metal grid, coated with an amalgam former carrier body which is partially melted in the glass bead of the electrode frame or in the Generalrohreinschmelzung.
  • an amalgam former carrier body which is partially melted in the glass bead of the electrode frame or in the Generalrohreinschmelzung.
  • the starting amalgam is preferably designed so that its Hg vapor pressure at room temperature is lower than that of the working amalgam.
  • the location of the starting amalgam is preferably chosen so that its temperature during lamp operation is so high that the work amalgam located at a cooler location regulates the Hg vapor pressure.
  • the electrode frame includes two power supply elements, which at one end for holding or carrying a E-lektrodenchtl are formed and in this connection are connected to the electrode by terminals. Spaced apart, the two power supply elements are connected or fused with the glass bead, said components representing the electrode frame.
  • the mercury introduced as a filling component into the low-pressure discharge lamp forms indium amalgam with the indium on the metal sheet, which accelerates the start-up of the lamp and is therefore designated as auxiliary or starting amalgam.
  • other metals such as cadmium are also suitable as amalgam formers.
  • an amalgam-forming material acting as starting amalgam is applied only on this additional sheet-metal sheet joined only to the glass bead.
  • a major disadvantage of the known embodiments is that an additional part in the form of the metal sheet or the stainless steel flag is required, which in addition must first be attached to the power supply lines in a separate operation.
  • an additional pre-product is required, which is relatively expensive due to its required galvanic coating.
  • the additional attachment of this flag to a power supply is usually by welding, creating another step is required.
  • the power supply element does not oxidize in the region of the weld, which is usually located between the bead and the electrode clamp.
  • the flag should get hot as soon as possible.
  • the preferred location of attachment is therefore as close as possible to the electrode or lamp filament.
  • the helix Since in the known manufacturing process, the helix must be pasted after welding the flags with an emitter paste, in this case a required minimum distance to the helix of about 4 mm is required.
  • the mercury is released in the known embodiments in lamp operation and the indium liquid. Due to the good wetting properties of indium, this tends to creep in the direction of the hot coil. Therefore, losses of the indium can be expected.
  • a minimum amount of indium of about 2 mg is required for a service life of 10,000 hours. Due to the relatively large amount of indium, significantly more mercury is bound to the flag than is required to operate the lamp ( ⁇ 0.02 mg per 100 ml lamp volume). Depending on this timeout, a few tenths of a mg of mercury from working amalgam are bound to the flag. Since almost all the mercury is expelled from the flags during the starting phase, the lamp is supersaturated with mercury in the start-up phase.
  • An inventive power supply element for an electrode is formed as an elongate element.
  • An elongated part of the power supply element has a first portion which has an amalgam-forming material on the outside.
  • This configuration ensures that the amalgam-forming material component is virtually integrated in a power supply element, and no separate flag, such as an additional coated metal sheet, more is required.
  • a substantially location-targeted attachment of the amalgam-forming material with respect to the positioning of the electrode can be achieved.
  • the Hg release and the absorption of excess Hg by the work amalgam even during operation of the lamp can be done effectively and efficiently, whereby the operation of the lamp, in particular the starting behavior and the time to stabilization, can be improved.
  • the first portion of the elongated portion of the power supply element is for connection to the electrode.
  • the power supply element is thus designed so that just where the connection to the electrode is provided, the elongate part is formed on the outside with an amalgam-forming material. It is thus provided directly at the junction between the power supply element and the electrode of this amalgam-forming material, so that preferably also at the direct contact point between the electrode and the power supply element, the amalgam-forming material is present.
  • This site-specific attachment allows the amalgam former to be as close as possible to the electrode.
  • the amalgam is therefore very hot and the startup behavior improved significantly. In particular, in lamps with a so-called high temperature amalgam is given a significant improvement with this configuration.
  • the elongated part of the power supply element has the first portion, which has an amalgam-forming material on the outside, and a second portion, which on the outside a amalgam formation suppressing material having.
  • the power supply element is thus configured in its elongated part at least in two parts, which thus partially guarantees different functionalities.
  • amalgam formation can thus be substantially prevented.
  • the first and the second section are separate parts which are connected to one another, for example welded together.
  • the second part may be a dilatron wire which is butt welded to an amalgam-forming first portion
  • amalgam lamps which have a low mercury vapor pressure in the off state, however, can also be dispensed with this second portion of the power supply element.
  • this second section is provided.
  • the two portions of the elongate part of the power supply element are formed directly adjacent to each other.
  • the first section in which an amalgam-forming material is formed on the outside, is designed to clamp the electrode.
  • the first section is not completely rectilinear but is bent over. In a specific embodiment, therefore, this first section is formed as an elongated, rod-shaped portion which is bent over.
  • the amalgam-forming suppressing material in the second portion of the elongated portion of the current-carrying element comprises nickel.
  • nickel layer protects the power supply element in the colder region in a particularly efficient manner from amalgamation.
  • the material inhibiting the formation of amalgam is preferably formed with a layer thickness ⁇ 20 ⁇ m, in particular between 1 ⁇ m and 5 ⁇ m.
  • this layer thickness can be made extremely thin, and yet the required functionality can be ensured.
  • the power supply element is formed with a material core surrounded by a layer comprising an amalgam-forming material.
  • this layer surrounding the material core is formed completely from an amalgam-forming material.
  • the power supply element further comprises a layer which surrounds the core material and the layer comprising the amalgam-forming material.
  • production of the power supply element may also be realized by first forming around the material core the amalgam forming material layer and then applying only the layer in which the second portion is to be formed to the layer comprising the comprising amalgam formation inhibiting material. Specific removal of the amalgam-forming-inhibiting material to produce the first portion of the elongated portion of the current delivery element is not required in this approach.
  • the first portion of the power supply element is butt welded to the second portion of the power supply element.
  • the part consists of a uniform material, which does not tend to amalgamation and can be easily connected to the glass used in the lamp.
  • Such an alloy is e.g. given by material number 2.4486 (NiFe47Cr6).
  • the material core of the power supply element comprises iron and nickel.
  • the material core consists of iron and nickel. It proves particularly advantageous if the proportion of nickel in the core material is between 30% by weight and 60% by weight, in particular between 35 and 45% by weight, in particular 42% by weight.
  • the layer thickness of the amalgam-forming material is preferably chosen so that the amount of the amalgam-forming material resulting therefrom and from the length of the first section, in interaction with the working amalgam, can be between 0.02 and 0.1 mg Hg at room temperature per 100 ml lamp volume. This corresponds approximately to twice to 10 times the value of the optimum Hg vapor pressure which should be set in the equilibrium state of the lamp.
  • a corresponding basic thickness of the power supply element can be made possible and, on the other hand, the desired functionalities in the corresponding sections can be achieved particularly well without excessive power supply lines being created and undesirable amalgamations or too little amalgam formation at the corresponding sections would occur.
  • the amalgam-forming material comprises copper.
  • the copper content of the amalgam-forming material is between 20 and 50 percent by weight, in particular between 20 and 30 percent by weight, in particular 25 percent by weight.
  • a liquefaction in the lamp operation can be prevented.
  • Such liquefaction occurs, for example, in indium during lamp operation.
  • a creep of the copper material can be avoided, whereby the functionality of the lamp can be substantially increased.
  • the amount of copper should be such that it is capable of binding about 0.05 to 0.1 mg Hg at equilibrium.
  • the amount of the amalgam-forming material can be adjusted depending on the length of the first section.
  • the first portion of the elongated portion of the power supply element is an end portion of the power supply element.
  • the first portion is formed as an elongated rod which is bent to hold the electrode.
  • An electrode frame according to the invention comprises at least one power supply element according to the invention or an advantageous embodiment thereof.
  • the invention relates to a discharge lamp, in particular a low-pressure discharge lamp, which has at least one electrode frame with one or more power supply elements according to the invention or advantageous embodiments thereof.
  • the discharge lamp is designed as a low-pressure discharge lamp.
  • Fig. 1 is shown in a schematic simplified representation of an electrode frame 1, which is arranged for example in a low-pressure discharge lamp.
  • the electrode frame 1 comprises a first power supply element 2 and a second power supply element 3.
  • the power supply elements 2 and 3 are configured as rod-shaped elongate parts and in particular represent a wire-like configuration.
  • the shaping of the power supply elements 2 and 3 in the embodiment according to FIG Fig. 1 is merely exemplary and may also be provided in another embodiment.
  • the electrode frame 1 further comprises an electrode 4, which is designed as a lamp filament.
  • the electrode 4 is connected to end portions 5 and 6 of the power supply elements 2 and 3 by terminals. Distances too These front end portions 5 and 6, the power supply elements 2 and 3 are connected to a glass bead 7.
  • the power supply element 2 comprises a first section 8 and a second section 9 immediately adjacent thereto.
  • the first section 8 is substantially shorter than the second section 9.
  • the first section 8 has an amalgam-forming material on the outside.
  • a material protecting against amalgam formation is provided on the outside.
  • the sections 10 and 11 of the second power supply element 3 are formed.
  • the first two sections 8 and 10 are directly connected to the electrode 4 and formed for clamping the electrode 4.
  • Fig. 2 is shown in a schematic side view of the power supply element 2 alone, wherein by way of example the position of the electrode 4 is shown.
  • the first portion 8 represents an upper end portion of the power supply element 2 and thus the end portion 5. As shown in FIG Fig. 2 can be seen, this section 8 is bent so that the electrode 4 is clamped therebetween.
  • Fig. 3 Reference is made in which a cross-sectional view of the section line AA according to Fig. 2 is shown.
  • the sectional plane is thus formed perpendicular to the plane of the figure.
  • the power supply element 2 is multicomponent both in the first section 8, as well as in the second section 9 and multilayer structure, wherein in this context, the first layer or the first material region is formed as a material core 12.
  • the material core 12 has as material iron and nickel, wherein the nickel content is about 42 weight percent.
  • a layer 13 is formed, which has the amalgam-forming material.
  • copper is provided as the amalgam-forming material, and this is realized with a weight percentage of 25% in this layer 13.
  • a further layer 14 is formed on this layer 13 surrounding the material core 12, which layer comprises the material suppressing amalgam formation.
  • nickel is provided in the layer 14.
  • the layer thickness of the layer 14 is substantially thinner than the layer thickness of the layer 13. In particular, the layer thickness of the layer 14 is less than 20 .mu.m, in particular between 1 .mu.m and 5 .mu.m.
  • the amount of the amalgam-forming material is adjusted depending on the length of the first portion 8, in which respect an extremely precise adjustment is possible.
  • the amalgam-forming material is integrated directly into the power supply elements 2 and 3, so that it is no longer necessary to attach a separated metal sheet as a flag to the glass bead 7 or to one of the power supply elements 2 or 3.

Landscapes

  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Discharge Lamp (AREA)
EP08171190A 2008-12-10 2008-12-10 Stromzuführungselement für eine Elektrode und Elektrodengestell mit zumindest einem derartigen Stromzuführungselement Withdrawn EP2197021A1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP08171190A EP2197021A1 (de) 2008-12-10 2008-12-10 Stromzuführungselement für eine Elektrode und Elektrodengestell mit zumindest einem derartigen Stromzuführungselement
CN200910253435A CN101752186A (zh) 2008-12-10 2009-12-10 馈电元件以及电极支架
JP2009280903A JP2010140904A (ja) 2008-12-10 2009-12-10 電極用リード素子および電極支持体

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP08171190A EP2197021A1 (de) 2008-12-10 2008-12-10 Stromzuführungselement für eine Elektrode und Elektrodengestell mit zumindest einem derartigen Stromzuführungselement

Publications (1)

Publication Number Publication Date
EP2197021A1 true EP2197021A1 (de) 2010-06-16

Family

ID=40673408

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08171190A Withdrawn EP2197021A1 (de) 2008-12-10 2008-12-10 Stromzuführungselement für eine Elektrode und Elektrodengestell mit zumindest einem derartigen Stromzuführungselement

Country Status (3)

Country Link
EP (1) EP2197021A1 (zh)
JP (1) JP2010140904A (zh)
CN (1) CN101752186A (zh)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5566203B2 (ja) 2010-06-21 2014-08-06 Ｄｍｇ森精機株式会社 変位検出装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4445532A1 (de) 1994-12-20 1996-06-27 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Niederdruckentladungslampe
WO1997004477A1 (en) * 1995-07-21 1997-02-06 Philips Electronics N.V. Low-pressure mercury discharge lamp
US5909085A (en) * 1997-03-17 1999-06-01 Korry Electronics Co. Hybrid luminosity control system for a fluorescent lamp
WO1999062102A1 (en) * 1998-05-22 1999-12-02 Koninklijke Philips Electronics N.V. Low-pressure mercury vapor discharge lamp

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4445532A1 (de) 1994-12-20 1996-06-27 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Niederdruckentladungslampe
WO1997004477A1 (en) * 1995-07-21 1997-02-06 Philips Electronics N.V. Low-pressure mercury discharge lamp
US5909085A (en) * 1997-03-17 1999-06-01 Korry Electronics Co. Hybrid luminosity control system for a fluorescent lamp
WO1999062102A1 (en) * 1998-05-22 1999-12-02 Koninklijke Philips Electronics N.V. Low-pressure mercury vapor discharge lamp

Also Published As

Publication number Publication date
CN101752186A (zh) 2010-06-23
JP2010140904A (ja) 2010-06-24

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