CA2300741A1 - High-pressure discharge lamp - Google Patents
High-pressure discharge lamp Download PDFInfo
- Publication number
- CA2300741A1 CA2300741A1 CA 2300741 CA2300741A CA2300741A1 CA 2300741 A1 CA2300741 A1 CA 2300741A1 CA 2300741 CA2300741 CA 2300741 CA 2300741 A CA2300741 A CA 2300741A CA 2300741 A1 CA2300741 A1 CA 2300741A1
- Authority
- CA
- Canada
- Prior art keywords
- pressure discharge
- discharge lamp
- lamp
- lead
- leads
- 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.)
- Abandoned
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/02—Details
- H01J61/36—Seals between parts of vessels; Seals for leading-in conductors; Leading-in conductors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/02—Details
- H01J61/30—Vessels; Containers
- H01J61/34—Double-wall vessels or containers
Landscapes
- Vessels And Coating Films For Discharge Lamps (AREA)
Abstract
The high-pressure discharge lamp is fitted with electric leads (3, 4, 9, 15) and with an outer bulb (5) in which a discharge vessel (1) is held by means of frame parts.
Supply leads (9, 15) are led out at the ends of the discharge vessel (1). The connection between a first and a second electrically conducting lead is produced by a soldered connection (11, 16) which uses nickel and/or zirconium as solder.
Supply leads (9, 15) are led out at the ends of the discharge vessel (1). The connection between a first and a second electrically conducting lead is produced by a soldered connection (11, 16) which uses nickel and/or zirconium as solder.
Description
ATTORNEY DOCKET NO.: 99P5517 Page 1 of 6 High-pressure discharge lamp Technical field The invention proceeds from a high-pressure discharge lamp in accordance with the preamble of claim 1. It is, in particular, metal halide lamps, chiefly versions with a base at one end, which are under consideration here. However, sodium high-pressure lamps or mercury high-pressure discharge lamps are also suitable.
Prior art EP-A 566 975 has already disclosed a high-power high-pressure discharge lamp in which a discharge vessel is held in an outer bulb by means of a frame. In this case, at least one supply lead of the discharge vessel is connected in an electrically conducting fashion to a frame pari.
To date, welding (point welding or resistance welding) has been customary as the connecting technique. Hard soldering by means of a nickel-copper alloy (Ni-Cu) is used as an alternative. In the case of high currents, in particular those of more than 20 A, both techniques turn out to be disadvantageous, because the high contact 2 5 resistance renders the thermal loading of the connecting point excessive.
The service life of such lamps is therefore limited to 150 hours.
Summary of the invention 3 0 It is the object of the present invention to provide a high-pressure discharge lamp in accordance with the preamble of claim I which has a reliable connection, which can bear high loads, between electrically conducting parts and thereby permits an extended service life.
3 5 This object is achieved by means of the characterizing features of claim 1.
Particularly advantageous refinements are to be found in the dependent claims.
ATTORNEY DOCKET NO.: 99P5517 Page 2 of 6 According to the invention, use is now made of nickel and/or zirconium as solder between the electrically conducting parts to be connected. The thermal loading of the soldered joint is thereby substantially reduced, because the contact resistance is very low. Consequently, it is easily possible to achieve large-area contact between the lamp parts to be connected. The contact area is larger by at least a factor of 10 than in the case of welding.
This technique can be applied particularly effectively in the case of parts made from molybdenum, since nickel makes a good connection with molybdenum. This technique is also suitable whenever the diameter of the parts is relatively large, in particular larger than 2 mm. The parts to be connected are frequently wires with a diameter of 1 to 5 mm.
The solder made from pure nickel (or zirconium) is in this case firstly applied as wire in annular form or as a cylinder and then heated. Its melting point is at more than 1300°C (Ni: 1450°C; Zr: 1850°C). The soldered connection is preferably produced by induction. It is advantageous in this case when large-area contact between the two parts to be connected is produced by winding the second part 2 0 around the first part.
In detail, the present invention relates to a high-pressure discharge lamp having electric current conductors and having an outer bulb in which a discharge vessel is held by means of frame parts, supply leads being led out at the ends of the 2 5 discharge vessel. At least one connection between two current conductors, hereinafter referred to as a first and a second electrically conducting lead, is produced by a soldered connection which uses nickel and/or zirconium as solder.
In particular, the first lead is a frame part and the second lead is a supply lead.
3 0 However, the connection can also relate to two frame parts or various parts of a supply lead or lead-through. Of course, an arbitrary number of connections can also be implemented inside the lamp, or also in the base region outside the outer bulb of the lamp by means of the soldered connection according to the invention.
3 5 The leads are normally wires (and/or pins or bars) having a diameter of up to 7 mm. A practical lower limit is 1 mm. However, differently shaped parts (for example plates) can also be connected in this manner to other parts.
ATTORNEY DOCKET NO.: 99P5517 Page 3 of 6 At least one, preferably both leads are produced from molybdenum. The reason for this is that molybdenum makes a particularly intimate connection with nickel and/or zirconium.
In a particularly preferred embodiment, the operating current of the lamp is more than 20 A. Currents of 100 A can also be managed.
The connection according to the invention is of great importance in the case of a lamp in which a discharge vessel sealed at two ends is held by means of a frame in an outer bulb sealed at one end.
In order to achieve a connection between the two parts to be connected over as large an area as possible, it is advisable for one of the two leads to be wound around the other lead. Reliable contact is achieved with one to three turns.
Figures 2 0 The invention is to be explained in more detail below with the aid of a plurality of exemplary embodiments. In the drawing:
Figure 1 shows a metal halide lamp, partially in section.
2 5 Description of the drawings Figure 1 represents the design of a high-pressure discharge lamp according to the invention with a base at one end. The high-pressure discharge lamp described here in the exemplary embodiment is a metal halide lamp for photooptical purposes 3 0 having a power consumption of 6 kW.
The high-pressure discharge lamp has a discharge vessel 1 sealed at two ends and made from quartz glass, in which an ionizable filling gas and two electrodes 2 are enclosed.
The discharge vessel 1 is held by means of a bipartite frame 3, 4 in an outer bulb 5 which is sealed at one end and evacuated (or also filled with nitrogen). The outer ATTORNEY DOCKET NO.: 99P5517 Page 4 of 6 bulb 5 is essentially axially symmetric. Its end 6 near the base is cemented in a ceramic base 7. The base 7 has a high-voltage endurance of more than 70 kV.
A long frame bow 3 runs along the discharge vessel 1 to the dome-shaped end 8, remote from the base, of the outer bulb, and is connected there by means of two turns 10 to a supply lead 9 which is led out axially from the discharge vessel. The supply lead and the bow are soldered with the aid of nickel solder 11 in the region of the turns. This supply lead 9 remote from the base is fixed in an exhaust tip 12 in the dome 8 of the outer bulb. The long bow 3 is partially sheathed in a quartz glass tube 13 which is inserted in an extension tube 20 in the end 6 of the outer bulb 5 near the base.
In a similar way, a short frame bow 4, which is arranged parallel to the long bow 3, is also surrounded by a quartz glass tube 14 and held in the end 6 near the base.
The bow 4 is connected to the supply lead 15, which is led out from the end 6 of the discharge vessel near the base, by virtue of the fact that here, as well, the wire of the bow 4 is wound around the supply lead 15. Here, as well, nickel solder 16 is used for soldering in the region of the connecting point.
2 0 The bows 3, 4 made from molybdenum are connected in each case via solid litz wires 17 to contact pins 18 at the end of the base. The cavities inside the base are filled up with a ceramic sealing compound 19 with high-voltage endurance.
By comparison with a lamp of the same design with point welding as a connection 2 5 between the supply lead and frame bow, this lamp achieved a service life which was longer by more than 300%. Instead of 150 hours, more than 600 hours are reached.
In the case of a lamp of identical design in principle and having 10 kW, zirconium 3 0 is used instead of nickel as the solder 11. The reason for this is that Zr can be subjected to even higher thermal loads, since it has a higher melting point.
It has not been possible to date to use both solders, since it is necessary to ensure very rapid heating of the parts to be soldered so that excessive heating and oxidation, initiated thereby, of the adjacent parts are prevented. The best results can be 3 5 achieved with the aid of a heating process operating inductively. The overall soldering operation (from melting of the annular solder up to the distribution of the solder as far as into the turns) lasts approximately 10 to 15 seconds.
Prior art EP-A 566 975 has already disclosed a high-power high-pressure discharge lamp in which a discharge vessel is held in an outer bulb by means of a frame. In this case, at least one supply lead of the discharge vessel is connected in an electrically conducting fashion to a frame pari.
To date, welding (point welding or resistance welding) has been customary as the connecting technique. Hard soldering by means of a nickel-copper alloy (Ni-Cu) is used as an alternative. In the case of high currents, in particular those of more than 20 A, both techniques turn out to be disadvantageous, because the high contact 2 5 resistance renders the thermal loading of the connecting point excessive.
The service life of such lamps is therefore limited to 150 hours.
Summary of the invention 3 0 It is the object of the present invention to provide a high-pressure discharge lamp in accordance with the preamble of claim I which has a reliable connection, which can bear high loads, between electrically conducting parts and thereby permits an extended service life.
3 5 This object is achieved by means of the characterizing features of claim 1.
Particularly advantageous refinements are to be found in the dependent claims.
ATTORNEY DOCKET NO.: 99P5517 Page 2 of 6 According to the invention, use is now made of nickel and/or zirconium as solder between the electrically conducting parts to be connected. The thermal loading of the soldered joint is thereby substantially reduced, because the contact resistance is very low. Consequently, it is easily possible to achieve large-area contact between the lamp parts to be connected. The contact area is larger by at least a factor of 10 than in the case of welding.
This technique can be applied particularly effectively in the case of parts made from molybdenum, since nickel makes a good connection with molybdenum. This technique is also suitable whenever the diameter of the parts is relatively large, in particular larger than 2 mm. The parts to be connected are frequently wires with a diameter of 1 to 5 mm.
The solder made from pure nickel (or zirconium) is in this case firstly applied as wire in annular form or as a cylinder and then heated. Its melting point is at more than 1300°C (Ni: 1450°C; Zr: 1850°C). The soldered connection is preferably produced by induction. It is advantageous in this case when large-area contact between the two parts to be connected is produced by winding the second part 2 0 around the first part.
In detail, the present invention relates to a high-pressure discharge lamp having electric current conductors and having an outer bulb in which a discharge vessel is held by means of frame parts, supply leads being led out at the ends of the 2 5 discharge vessel. At least one connection between two current conductors, hereinafter referred to as a first and a second electrically conducting lead, is produced by a soldered connection which uses nickel and/or zirconium as solder.
In particular, the first lead is a frame part and the second lead is a supply lead.
3 0 However, the connection can also relate to two frame parts or various parts of a supply lead or lead-through. Of course, an arbitrary number of connections can also be implemented inside the lamp, or also in the base region outside the outer bulb of the lamp by means of the soldered connection according to the invention.
3 5 The leads are normally wires (and/or pins or bars) having a diameter of up to 7 mm. A practical lower limit is 1 mm. However, differently shaped parts (for example plates) can also be connected in this manner to other parts.
ATTORNEY DOCKET NO.: 99P5517 Page 3 of 6 At least one, preferably both leads are produced from molybdenum. The reason for this is that molybdenum makes a particularly intimate connection with nickel and/or zirconium.
In a particularly preferred embodiment, the operating current of the lamp is more than 20 A. Currents of 100 A can also be managed.
The connection according to the invention is of great importance in the case of a lamp in which a discharge vessel sealed at two ends is held by means of a frame in an outer bulb sealed at one end.
In order to achieve a connection between the two parts to be connected over as large an area as possible, it is advisable for one of the two leads to be wound around the other lead. Reliable contact is achieved with one to three turns.
Figures 2 0 The invention is to be explained in more detail below with the aid of a plurality of exemplary embodiments. In the drawing:
Figure 1 shows a metal halide lamp, partially in section.
2 5 Description of the drawings Figure 1 represents the design of a high-pressure discharge lamp according to the invention with a base at one end. The high-pressure discharge lamp described here in the exemplary embodiment is a metal halide lamp for photooptical purposes 3 0 having a power consumption of 6 kW.
The high-pressure discharge lamp has a discharge vessel 1 sealed at two ends and made from quartz glass, in which an ionizable filling gas and two electrodes 2 are enclosed.
The discharge vessel 1 is held by means of a bipartite frame 3, 4 in an outer bulb 5 which is sealed at one end and evacuated (or also filled with nitrogen). The outer ATTORNEY DOCKET NO.: 99P5517 Page 4 of 6 bulb 5 is essentially axially symmetric. Its end 6 near the base is cemented in a ceramic base 7. The base 7 has a high-voltage endurance of more than 70 kV.
A long frame bow 3 runs along the discharge vessel 1 to the dome-shaped end 8, remote from the base, of the outer bulb, and is connected there by means of two turns 10 to a supply lead 9 which is led out axially from the discharge vessel. The supply lead and the bow are soldered with the aid of nickel solder 11 in the region of the turns. This supply lead 9 remote from the base is fixed in an exhaust tip 12 in the dome 8 of the outer bulb. The long bow 3 is partially sheathed in a quartz glass tube 13 which is inserted in an extension tube 20 in the end 6 of the outer bulb 5 near the base.
In a similar way, a short frame bow 4, which is arranged parallel to the long bow 3, is also surrounded by a quartz glass tube 14 and held in the end 6 near the base.
The bow 4 is connected to the supply lead 15, which is led out from the end 6 of the discharge vessel near the base, by virtue of the fact that here, as well, the wire of the bow 4 is wound around the supply lead 15. Here, as well, nickel solder 16 is used for soldering in the region of the connecting point.
2 0 The bows 3, 4 made from molybdenum are connected in each case via solid litz wires 17 to contact pins 18 at the end of the base. The cavities inside the base are filled up with a ceramic sealing compound 19 with high-voltage endurance.
By comparison with a lamp of the same design with point welding as a connection 2 5 between the supply lead and frame bow, this lamp achieved a service life which was longer by more than 300%. Instead of 150 hours, more than 600 hours are reached.
In the case of a lamp of identical design in principle and having 10 kW, zirconium 3 0 is used instead of nickel as the solder 11. The reason for this is that Zr can be subjected to even higher thermal loads, since it has a higher melting point.
It has not been possible to date to use both solders, since it is necessary to ensure very rapid heating of the parts to be soldered so that excessive heating and oxidation, initiated thereby, of the adjacent parts are prevented. The best results can be 3 5 achieved with the aid of a heating process operating inductively. The overall soldering operation (from melting of the annular solder up to the distribution of the solder as far as into the turns) lasts approximately 10 to 15 seconds.
Claims (9)
1. A high-pressure discharge lamp having electric current conductors and having an outer bulb (5) in which a discharge vessel (1) is held by means of frame parts (3, 4), supply leads (9, 15) being led out at the ends of the discharge vessel, wherein a connection between two current conductors, hereinafter referred to as a first and a second electrically conducting lead, is produced by a soldered connection (11; 16) which uses nickel and/or zirconium as solder.
2. The high-pressure discharge lamp as claimed in claim 1, wherein the first lead is a frame part (3; 4) and the second lead is a supply lead (9; 15).
3. The high-pressure discharge lamp as claimed in claim 1, wherein the leads (3; 4; 9; 15) are wires having a diameter of up to 7 mm.
4. The high-pressure discharge lamp as claimed in claim 1, wherein at least one, preferably both leads are produced from molybdenum.
5. The high-pressure discharge lamp as claimed in claim 1, wherein the operating current of the lamp is more than 20 A.
6. The high-pressure discharge lamp as claimed in claim 1, wherein the lamp includes a discharge vessel (1), sealed at two ends, in an outer bulb (5) sealed at one end.
7. The high-pressure discharge lamp as claimed in claim 1, wherein a large-area connection is produced between the two parts to be connected.
8. The high-pressure discharge lamp as claimed in claim 7, wherein one of the two leads (3; 4) is wound around the other lead (9; 15).
9. The high-pressure discharge lamp as claimed in claim 1, wherein the soldered connection is produced by means of induction.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19913297.6 | 1999-03-24 | ||
| DE1999113297 DE19913297C1 (en) | 1999-03-24 | 1999-03-24 | High pressure gas discharge lamp has nickel and/or zircon used as solder material for solder connections between current wires at ends of discharge envelope and electrical supply leads |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2300741A1 true CA2300741A1 (en) | 2000-09-24 |
Family
ID=7902220
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2300741 Abandoned CA2300741A1 (en) | 1999-03-24 | 2000-03-15 | High-pressure discharge lamp |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP1039505A1 (en) |
| JP (1) | JP2000277055A (en) |
| CN (1) | CN1269596A (en) |
| BR (1) | BR0001406A (en) |
| CA (1) | CA2300741A1 (en) |
| DE (1) | DE19913297C1 (en) |
| TW (1) | TW446989B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7977854B2 (en) | 2007-03-30 | 2011-07-12 | Osram Gesellschaft Mit Beschraenkter Haftung | Component for an electric lamp with outer bulb |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102010002397A1 (en) | 2010-02-26 | 2011-09-01 | Osram Gesellschaft mit beschränkter Haftung | High pressure discharge lamp |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3751577A (en) * | 1972-06-12 | 1973-08-07 | Us Army | Seal for a high pressure, short arc gas lamp |
| DE8701119U1 (en) * | 1987-01-23 | 1988-05-19 | Heimann Gmbh, 6200 Wiesbaden, De | |
| DE9205537U1 (en) * | 1992-04-23 | 1992-06-17 | Patent-Treuhand-Gesellschaft Fuer Elektrische Gluehlampen Mbh, 8000 Muenchen, De | |
| DE69507283T2 (en) * | 1994-11-08 | 1999-07-01 | Koninkl Philips Electronics Nv | LOW PRESSURE DISCHARGE LAMP |
| US5821681A (en) * | 1995-09-29 | 1998-10-13 | Wedgewood Technology, Inc. | Low pressure discharge lamp assembly |
-
1999
- 1999-03-24 DE DE1999113297 patent/DE19913297C1/en not_active Expired - Fee Related
-
2000
- 2000-02-16 EP EP00103111A patent/EP1039505A1/en not_active Withdrawn
- 2000-03-15 CA CA 2300741 patent/CA2300741A1/en not_active Abandoned
- 2000-03-15 TW TW89104752A patent/TW446989B/en not_active IP Right Cessation
- 2000-03-21 JP JP2000078477A patent/JP2000277055A/en active Pending
- 2000-03-23 BR BR0001406A patent/BR0001406A/en not_active Application Discontinuation
- 2000-03-24 CN CN 00104821 patent/CN1269596A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7977854B2 (en) | 2007-03-30 | 2011-07-12 | Osram Gesellschaft Mit Beschraenkter Haftung | Component for an electric lamp with outer bulb |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2000277055A (en) | 2000-10-06 |
| DE19913297C1 (en) | 2000-04-20 |
| CN1269596A (en) | 2000-10-11 |
| BR0001406A (en) | 2000-10-17 |
| TW446989B (en) | 2001-07-21 |
| EP1039505A1 (en) | 2000-09-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |