EP1709668A1 - Niederdruckentladungslampe - Google Patents
NiederdruckentladungslampeInfo
- Publication number
- EP1709668A1 EP1709668A1 EP04762554A EP04762554A EP1709668A1 EP 1709668 A1 EP1709668 A1 EP 1709668A1 EP 04762554 A EP04762554 A EP 04762554A EP 04762554 A EP04762554 A EP 04762554A EP 1709668 A1 EP1709668 A1 EP 1709668A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- electrode
- low
- pressure discharge
- discharge lamp
- 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.)
- Granted
Links
- 239000004020 conductor Substances 0.000 claims abstract description 7
- 239000011248 coating agent Substances 0.000 claims abstract description 4
- 238000000576 coating method Methods 0.000 claims abstract description 4
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000000203 mixture Substances 0.000 claims abstract description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 5
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 3
- 229910052753 mercury Inorganic materials 0.000 claims description 3
- 229910052756 noble gas Inorganic materials 0.000 claims description 3
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 3
- KJTLSVCANCCWHF-UHFFFAOYSA-N Ruthenium Chemical compound [Ru] KJTLSVCANCCWHF-UHFFFAOYSA-N 0.000 claims description 2
- 229910052759 nickel Inorganic materials 0.000 claims description 2
- 229910052707 ruthenium Inorganic materials 0.000 claims description 2
- 229910052721 tungsten Inorganic materials 0.000 claims description 2
- 239000010937 tungsten Substances 0.000 claims description 2
- 239000011521 glass Substances 0.000 abstract description 5
- 239000011261 inert gas Substances 0.000 abstract 1
- 238000010891 electric arc Methods 0.000 description 6
- 239000007772 electrode material Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000010849 ion bombardment Methods 0.000 description 3
- 238000004544 sputter deposition Methods 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- 102100021749 LIM and senescent cell antigen-like-containing domain protein 3 Human genes 0.000 description 2
- 101710104347 LIM and senescent cell antigen-like-containing domain protein 3 Proteins 0.000 description 2
- 239000011324 bead Substances 0.000 description 2
- 238000011835 investigation Methods 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 208000034656 Contusions Diseases 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 229910018487 Ni—Cr Inorganic materials 0.000 description 1
- 206010052428 Wound Diseases 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/02—Details
- H01J61/54—Igniting arrangements, e.g. promoting ionisation for starting
- H01J61/545—Igniting arrangements, e.g. promoting ionisation for starting using an auxiliary electrode inside the vessel
-
- 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
- H01J61/0672—Main electrodes for low-pressure discharge lamps characterised by the construction of the electrode
Definitions
- the invention relates to a low-pressure discharge lamp with an essentially tubular discharge vessel made of glass which is sealed gas-tight at the ends, a filling made of a noble gas mixture and possibly mercury and possibly a phosphor coating on the inner wall of the discharge vessel, two current leads being melted gas-tight in each of the two ends of the discharge vessel are, which run essentially parallel to the longitudinal axis of the discharge vessel in this section and to the inner end of which is attached a spiral electrode which extends essentially transversely to the longitudinal axis of the discharge vessel.
- the lamp When a low-pressure discharge lamp is cold started without electrode preheating, the lamp first starts with a glow discharge when connected to the mains. This glow discharge with a current in the range of a few mA changes into the arc discharge after approx. 20 to 100 ms, ie after the electrodes have been heated. The transition now takes place during the transition from the glow discharge to the arc discharge Bend at the transition from the part not pasted with electrode material to the pasted part of the electrode, since the pasted part of the electrode is still cold and therefore not conductive. Due to the fact that the arc is always in the same place on the filament electrode each time the lamp is switched on, there is a sputtering off of electrode material and thus a premature breakage of the electrode compared to the preheated electrode.
- the object of the present invention is to provide a low-pressure discharge lamp which, when cold-started, has a higher switching stability than the previously known low-pressure discharge lamps and thus an extended average service life.
- a low-pressure discharge lamp with an essentially tubular discharge vessel made of glass, which is sealed gas-tight at the ends, a filling made of a noble gas mixture and possibly mercury, and possibly a phosphor coating on the inner wall of the discharge vessel, two in each case in the two ends of the discharge vessel
- Current supply lines are melted in a gas-tight manner, which run essentially parallel to the longitudinal axis of the discharge vessel in this section and to whose inner end a spiral electrode which is essentially transverse to the longitudinal axis of the discharge vessel is fastened, in that at least to increase the switching stability of the lamp during cold start operation a further electrode made of a conductive material is arranged in the area between the filament electrode and the subsequent end of the discharge vessel, one end of this further electrode having one of the two currents feeders is electrically connected.
- This additional electrode serves as a sacrificial electrode, because this is an electrode that is used to discharge the arc to attach the arc when it is set the arc discharge is offered, it is irrelevant whether material of this electrode is sputtered.
- the arc discharge first starts at this sacrificial electrode and then jumps when the emitter material on the coil electrode has been heated by ion bombardment to such an extent that it is hot enough for the thermal emission of electrons, onto the coil electrode.
- the coil electrode Since the coil electrode must be heated to the required operating temperature of approx. 900 to 1500 K even if another electrode is used as the sacrificial electrode and this can only be achieved with sufficient speed by ion bombardment, the ion bombardment on the coil electrode must not be completely prevented.
- the further electrode in order to keep the sputtering of electrode material from the coil electrode small, the further electrode must be attached geometrically relative to the coil electrode such that the plasma density at the coil electrode is significant compared to the case without an additional electrode, i.e. is reduced by a factor of approximately 100.
- the further electrode is advantageously mounted in such a way that, when viewed perpendicularly to the plane formed by the two current leads and the spiral electrode, it largely lies between the two current leads.
- NE is the plasma density at the location of the spiral electrode
- n Pr s E is the plasma density at the location of the further electrode.
- the energy of the ions that strikes the spiral electrode and the further electrode is thus approximately the same size; however, due to the low plasma density n P
- the conductive material of the electrode has a high coefficient for the secondary electron emission. Investigations with different materials showed that especially nickel and / or ruthenium but also tungsten are suitable for this. In contrast, molybdenum, which should also be very suitable due to its high secondary electron emission coefficient, has not proven to be suitable, which is not yet understood.
- the further electrode advantageously consists of a wire with a wire diameter between 50 and 150 ⁇ m.
- the further electrode should be arranged as close as possible to the spiral electrode.
- the further electrode extends essentially parallel to the axis of the spiral electrode from the power supply to which it is electrically connected in the direction of the other power supply.
- Particularly advantageous results with regard to the arc attachment on the further electrode are obtained if the electrode extends 40 to 60% of the distance between the two current leads in the direction of the other current leads. Since after the ignition of the lamp the electric field on the additional electrode preferably runs parallel to the axis of the discharge vessel, it is advantageous if part of the additional electrode points in this direction in order to keep the glow discharge on the additional electrode. For this reason the free end of the further electrode is bent in the direction of the spiral electrode.
- a favorable distance between the axis of the filament electrode and the free end or tip of the additional electrode essentially depends on the inside diameter of the discharge vessel in this area.
- a negative glow light is formed around this electrode, which is of the order of half the inside diameter of the discharge vessel. This forms directly on the surface of the further electrode Cathode drop space.
- the plasma density rises steeply in the negative glow light in order to drop significantly after a maximum until the level of the positive column is reached at the end of the negative glow light.
- the free end of the further electrode (7, 8) therefore preferably has a distance of (0.2-1) x R ⁇ n ⁇ e nrohr from the spiral electrode (5), wherein R
- the further electrode (7, 8) can advantageously be fastened to the power supply line rotated by an angle of less than or equal to 45 ° with respect to the axis of the spiral electrode. This favors the ignition of the glow discharge at the sacrificial electrode, since the initial electron avalanche runs from the electrode to the wall of the discharge vessel. The closer the sacrificial electrode comes to the wall of the discharge vessel, the more likely the glow discharge will ignite on the sacrificial electrode.
- a further improvement in the switching stability and thus the average lamp life during cold start operation is achieved if the lamp has two further electrodes instead of another electrode as the sacrificial electrode, one end of each further electrode being connected to one of the two current leads of the same filament electrode, so that each of the two power leads, another electrode is electrically connected.
- the figure shows one end of a compact low-pressure discharge lamp according to the invention with a power consumption of 21 W.
- Discharge vessel 1 is made up of three U-shaped discharge vessel parts with a tube outer diameter of 12 mm, which are connected by cross-fusion to form a coherent discharge path.
- the two ends of the discharge vessel are sealed gas-tight by a pinch 2.
- two current leads 3, 4 made of Fe-Ni-Cr wire with a wire diameter of 400 ⁇ m are melted in a gas-tight manner and carry a spiral electrode 5 made of double-wound tungsten wire at their inner end.
- the two power supplies 3, 4 are additionally held by a glass bead 6 in the middle between the spiral electrode 5 and the pinch 2 into which they are melted.
- a further electrode 7, 8 is in each case attached as a sacrificial electrode between the glass bead 6 and the spiral electrode 5 on the two power supply lines 3, 4.
- the two further electrodes 7, 8 consist of nickel wire with a wire diameter of 125 ⁇ m. They run away from the power supply lines 3, 4 parallel to the axis of the coil electrode 5 and are angled at their end at a right angle to the coil electrode 5. There is a distance of 1.25 mm between the tips of the further electrodes 7, 8 and the spiral electrode 5.
- the sections of the further electrodes 7, 8 parallel to the spiral electrode 5 have a length of 3 mm; they are welded to the opposite side of the respective power supply 3 or 4 and thus do not touch.
Landscapes
- Discharge Lamp (AREA)
- Discharge Lamps And Accessories Thereof (AREA)
- Circuit Arrangements For Discharge Lamps (AREA)
- Vessels And Coating Films For Discharge Lamps (AREA)
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102004004655A DE102004004655A1 (de) | 2004-01-29 | 2004-01-29 | Niederdruckentladungslampe |
| PCT/DE2004/001709 WO2005074007A1 (de) | 2004-01-29 | 2004-07-30 | Niederdruckentladungslampe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1709668A1 true EP1709668A1 (de) | 2006-10-11 |
| EP1709668B1 EP1709668B1 (de) | 2008-09-10 |
Family
ID=34801248
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP04762554A Expired - Lifetime EP1709668B1 (de) | 2004-01-29 | 2004-07-30 | Niederdruckentladungslampe |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US7385353B2 (de) |
| EP (1) | EP1709668B1 (de) |
| JP (1) | JP2007520034A (de) |
| CN (1) | CN1906731B (de) |
| AT (1) | ATE408238T1 (de) |
| CA (1) | CA2554272A1 (de) |
| DE (2) | DE102004004655A1 (de) |
| WO (1) | WO2005074007A1 (de) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7893617B2 (en) * | 2006-03-01 | 2011-02-22 | General Electric Company | Metal electrodes for electric plasma discharge devices |
| DE102006052760A1 (de) * | 2006-11-08 | 2008-05-15 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Verfahren zum Fertigen und Einbringen eines Elektrodengestells mit einer Lampenwendel in ein Entladungsgefäß einer Entladungslampe |
| DE102006052952A1 (de) * | 2006-11-09 | 2008-05-15 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Entladungslampe mit einem Entladungsgefäß und einem Elektrodengestell |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2272486A (en) * | 1939-04-10 | 1942-02-10 | Gen Electric | Gaseous discharge device and electrode assembly for use therein |
| US2312246A (en) * | 1939-05-12 | 1943-02-23 | Gen Electric | Electric discharge device |
| US2306925A (en) * | 1941-07-29 | 1942-12-29 | Gen Electric | Electrode and its fabrication |
| US3549937A (en) * | 1968-02-03 | 1970-12-22 | Tokyo Shibaura Electric Co | Low pressure mercury vapour discharge lamp including an alloy type getter coating |
| JPS62291855A (ja) * | 1986-06-11 | 1987-12-18 | Matsushita Electronics Corp | 螢光ランプ |
| JPS63141252A (ja) * | 1986-12-02 | 1988-06-13 | Hitachi Ltd | 低圧放電灯 |
| JPH0286041A (ja) * | 1988-09-20 | 1990-03-27 | Toshiba Lighting & Technol Corp | 低圧水銀蒸気放電灯 |
| JPH06229185A (ja) | 1993-02-04 | 1994-08-16 | Tomotake Shigemori | 掘削機等のロッドの接続機構 |
| JPH08298096A (ja) * | 1995-04-28 | 1996-11-12 | Matsushita Electric Works Ltd | 低圧放電灯用電極及びその製造方法 |
| EP0777261B1 (de) * | 1995-12-01 | 2002-05-08 | Koninklijke Philips Electronics N.V. | Niederdruckentladungslampe |
| US5905339A (en) * | 1995-12-29 | 1999-05-18 | Philips Electronics North America Corporation | Gas discharge lamp having an electrode with a low heat capacity tip |
| US6809477B2 (en) * | 2002-02-21 | 2004-10-26 | General Electric Company | Fluorescent lamp electrode for instant start circuits |
| WO2004068532A2 (en) * | 2003-01-30 | 2004-08-12 | Koninklijke Philips Electronics N.V. | Fluorescent lamp with a second ballast for dimmed lighting mode |
-
2004
- 2004-01-29 DE DE102004004655A patent/DE102004004655A1/de not_active Withdrawn
- 2004-07-30 DE DE502004008052T patent/DE502004008052D1/de not_active Expired - Lifetime
- 2004-07-30 WO PCT/DE2004/001709 patent/WO2005074007A1/de not_active Ceased
- 2004-07-30 CA CA002554272A patent/CA2554272A1/en not_active Abandoned
- 2004-07-30 EP EP04762554A patent/EP1709668B1/de not_active Expired - Lifetime
- 2004-07-30 JP JP2006549843A patent/JP2007520034A/ja active Pending
- 2004-07-30 CN CN200480041073XA patent/CN1906731B/zh not_active Expired - Fee Related
- 2004-07-30 AT AT04762554T patent/ATE408238T1/de not_active IP Right Cessation
- 2004-07-30 US US10/586,928 patent/US7385353B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2005074007A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102004004655A1 (de) | 2005-08-18 |
| CN1906731A (zh) | 2007-01-31 |
| CN1906731B (zh) | 2010-04-28 |
| ATE408238T1 (de) | 2008-09-15 |
| US7385353B2 (en) | 2008-06-10 |
| DE502004008052D1 (de) | 2008-10-23 |
| EP1709668B1 (de) | 2008-09-10 |
| CA2554272A1 (en) | 2005-08-11 |
| US20070114941A1 (en) | 2007-05-24 |
| WO2005074007A1 (de) | 2005-08-11 |
| JP2007520034A (ja) | 2007-07-19 |
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Inventor name: MALIK, VIKTOR Inventor name: HILSCHER, ACHIM Inventor name: GARNER, RICHARD Inventor name: PANKRATZ, KLAUS Inventor name: LIEDER, GERD, H. Inventor name: NOLL, THOMAS |
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