EP1040504A1 - Elektrode für entladungslampen - Google Patents
Elektrode für entladungslampenInfo
- Publication number
- EP1040504A1 EP1040504A1 EP98916837A EP98916837A EP1040504A1 EP 1040504 A1 EP1040504 A1 EP 1040504A1 EP 98916837 A EP98916837 A EP 98916837A EP 98916837 A EP98916837 A EP 98916837A EP 1040504 A1 EP1040504 A1 EP 1040504A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- electrode
- pin
- wire
- discharge lamps
- electrode body
- 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
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
- H01J9/02—Manufacture of electrodes or electrode systems
-
- 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
- H01J61/073—Main electrodes for high-pressure discharge lamps
- H01J61/0732—Main electrodes for high-pressure discharge lamps characterised by the construction of the electrode
Definitions
- the invention relates to an electrode for discharge lamps with a pin at least partially enclosed by a solid body.
- Electrodes of the type mentioned at the outset are used in discharge lamps in order to emit or receive electrons in the event of a gas discharge.
- the electrodes each contain a pin, from the free end of which electrons emerge or enter the pin at this end, the pin in the vicinity of its free end usually being partially enclosed by a heat sink, which is usually a coil wound around the pin Wire is formed.
- the pen is there Made of a high-melting conductive material, usually tungsten, and can contain additives from thorium, lanthanum, cerium and yttrium.
- Electrodes in which the heat sink or electrode body is formed from a wire coil often have the disadvantage that the wire coil is connected to the pin with too little strength and thus no robust unit is formed from the electrode body and pin.
- the object of the invention is to provide an electrode for discharge lamps, in which the electrode body is firmly connected to the pin and forms a robust unit with it.
- this object is achieved in that the electrode body is formed from a wire coil and is welded to the pin at one or more fixed points by means of laser beams.
- this object is achieved for an electrode of the type mentioned at the outset in that the electrode body is formed from a wire coil and is welded to the pin at one or more fixed points by means of electron beams.
- the electrode according to the invention achieves that in addition to the frictional force caused by an elastic pre-tension of the wire winding surrounding the pin A further anchoring of the electrode body on the pin is achieved by directly welding the two components at at least any point at which these components come into contact with one another. This increases the overall strength with which the electrode body is connected to the pin.
- the action of the laser beam on the pen surface causes the same to deform, which results in a local change in radius or increase in radius. Due to this deformation, the solid body is prevented from sliding over the pin or being pushed over it.
- At least one end of the wire winding is severed by means of laser beams in order to separate it from the remaining winding wire after the winding process.
- this end of the wire coil is melted back down to the outer diameter of the wire coil, so that it does not protrude from the wire coil, or at least insignificantly. This creates a wire winding that is homogeneous in its outer dimensions and has optimum properties with regard to effectiveness and durability.
- Fig.l shows a conventional discharge lamp in a cross-sectional view
- 2 shows an electrode for discharge lamps according to the prior art, in a side view
- 3 shows a preferred embodiment of the invention
- Electrode in a side view.
- the molybdenum foils 14, 14 ' act as current supply elements within the glass bulb to the electrode pins 13, 13'.
- 2 shows a side view of a conventional electrode 11, as is used in a discharge bulb 12 according to FIG. 1.
- the electrode body or heat sink 17 is formed from a wire wound around the electrode 11, the ends 17a and 17b of which are exposed.
- the wire can, as shown in the figure, be wound in two layers in different directions.
- the same reference numerals designate the same components as in the electrode shown in FIG. 2.
- the electrode shown in FIG. 3 has four fixed points 19, 19 ', 19' 'and 19' '', at which the wire winding 17 is spot welded to the electrode pin 18.
- the number of fixed points 19, 19 ', 19' 'and 19' '' is only an example in the embodiment shown. Both a larger and a smaller number of fixed points are conceivable. In particular if a fixed point is of large volume, it is sufficient in the sense of achieving the object on which the invention is based if only a single fixed point 19 is provided.
- the ends 17a and 17b of the wire winding 17 are cut by means of laser beams from the wire which is used for winding the winding 17 during the production thereof was used.
- the ends 17a and 17b of the wire winding 17 are melted back to the respective outer diameter of the wire winding 17 so that, in contrast to the wire ends 17a and 17b of the electrode shown in FIG. 2, they do not protrude through the wire winding 17.
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Discharge Lamp (AREA)
- Laser Beam Processing (AREA)
- Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19757032 | 1997-12-20 | ||
DE19757032A DE19757032A1 (de) | 1997-12-20 | 1997-12-20 | Elektrode für Entladungslampen |
PCT/DE1998/000623 WO1999033082A1 (de) | 1997-12-20 | 1998-03-04 | Elektrode für entladungslampen |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1040504A1 true EP1040504A1 (de) | 2000-10-04 |
EP1040504B1 EP1040504B1 (de) | 2003-06-18 |
Family
ID=7852844
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98916837A Expired - Lifetime EP1040504B1 (de) | 1997-12-20 | 1998-03-04 | Verfahren zur herstellung einer elektrode für entladungslampen |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1040504B1 (de) |
JP (1) | JP2001527271A (de) |
AT (1) | ATE243361T1 (de) |
DE (2) | DE19757032A1 (de) |
WO (1) | WO1999033082A1 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4400095B2 (ja) * | 2003-06-03 | 2010-01-20 | ウシオ電機株式会社 | ショートアーク型超高圧水銀ランプ |
JP4748466B1 (ja) | 2010-04-02 | 2011-08-17 | 岩崎電気株式会社 | 放電灯用電極及びその製造方法 |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1888272U (de) * | 1964-02-27 | Westmghouse Flectric Corporation Pittsburgh Pa (V St A) \ertr Dipl Ing J Dellian Pat Anw München | Elektrode fur eine Entladungslampe | |
GB1049057A (en) * | 1964-06-11 | 1966-11-23 | Sciaky David | Electron beam welding out of vacuum |
FR2087545A5 (de) * | 1970-05-22 | 1971-12-31 | Lampes Sa | |
US4340836A (en) * | 1978-09-11 | 1982-07-20 | General Electric Company | Electrode for miniature high pressure metal halide lamp |
US4952841A (en) * | 1985-07-17 | 1990-08-28 | U.S. Philips Corporation | High-pressure discharge lamp with improved electrodes |
DE4035361A1 (de) * | 1990-11-07 | 1992-05-14 | Licentia Gmbh | Verfahren zum herstellen einer direkt geheizten kathode |
US5451837A (en) * | 1994-09-01 | 1995-09-19 | Osram Sylvania Inc. | Cathode for high intensity discharge lamp |
-
1997
- 1997-12-20 DE DE19757032A patent/DE19757032A1/de not_active Withdrawn
-
1998
- 1998-03-04 JP JP2000525903A patent/JP2001527271A/ja active Pending
- 1998-03-04 AT AT98916837T patent/ATE243361T1/de active
- 1998-03-04 WO PCT/DE1998/000623 patent/WO1999033082A1/de active IP Right Grant
- 1998-03-04 DE DE59808767T patent/DE59808767D1/de not_active Expired - Lifetime
- 1998-03-04 EP EP98916837A patent/EP1040504B1/de not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO9933082A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE59808767D1 (de) | 2003-07-24 |
ATE243361T1 (de) | 2003-07-15 |
DE19757032A1 (de) | 1999-07-01 |
WO1999033082A1 (de) | 1999-07-01 |
EP1040504B1 (de) | 2003-06-18 |
JP2001527271A (ja) | 2001-12-25 |
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