CA2240230A1 - Molybdenum foil seal in glass and an electric lamp having such a molybdenum foil seal - Google Patents
Molybdenum foil seal in glass and an electric lamp having such a molybdenum foil seal Download PDFInfo
- Publication number
- CA2240230A1 CA2240230A1 CA002240230A CA2240230A CA2240230A1 CA 2240230 A1 CA2240230 A1 CA 2240230A1 CA 002240230 A CA002240230 A CA 002240230A CA 2240230 A CA2240230 A CA 2240230A CA 2240230 A1 CA2240230 A1 CA 2240230A1
- Authority
- CA
- Canada
- Prior art keywords
- molybdenum foil
- molybdenum
- glass
- foil seal
- bounded
- 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
- 239000011888 foil Substances 0.000 title claims abstract description 89
- 229910052750 molybdenum Inorganic materials 0.000 title claims abstract description 83
- 239000011733 molybdenum Substances 0.000 title claims abstract description 83
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 title claims abstract description 82
- 239000011521 glass Substances 0.000 title claims description 19
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 20
- 238000005096 rolling process Methods 0.000 claims abstract description 5
- 238000004519 manufacturing process Methods 0.000 claims 1
- 235000012239 silicon dioxide Nutrition 0.000 claims 1
- 239000000377 silicon dioxide Substances 0.000 claims 1
- 230000015572 biosynthetic process Effects 0.000 abstract description 5
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 9
- 230000007423 decrease Effects 0.000 description 4
- 238000007789 sealing Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 2
- 150000002751 molybdenum Chemical class 0.000 description 2
- GWUSZQUVEVMBPI-UHFFFAOYSA-N nimetazepam Chemical compound N=1CC(=O)N(C)C2=CC=C([N+]([O-])=O)C=C2C=1C1=CC=CC=C1 GWUSZQUVEVMBPI-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- SIWVEOZUMHYXCS-UHFFFAOYSA-N oxo(oxoyttriooxy)yttrium Chemical compound O=[Y]O[Y]=O SIWVEOZUMHYXCS-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J5/00—Details relating to vessels or to leading-in conductors common to two or more basic types of discharge tubes or lamps
- H01J5/32—Seals for leading-in conductors
- H01J5/38—Pinched-stem or analogous seals
-
- 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
- H01J9/24—Manufacture or joining of vessels, leading-in conductors or bases
- H01J9/32—Sealing leading-in conductors
- H01J9/323—Sealing leading-in conductors into a discharge lamp or a gas-filled discharge device
- H01J9/326—Sealing leading-in conductors into a discharge lamp or a gas-filled discharge device making pinched-stem or analogous seals
-
- 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
- H01J61/366—Seals for leading-in conductors
- H01J61/368—Pinched seals or analogous seals
-
- 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
- H01J9/24—Manufacture or joining of vessels, leading-in conductors or bases
- H01J9/36—Joining connectors to internal electrode system
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Vessels And Coating Films For Discharge Lamps (AREA)
- Glass Compositions (AREA)
- Common Detailed Techniques For Electron Tubes Or Discharge Tubes (AREA)
Abstract
A molybdenum foil seal in silica glass which can be used, for example, for gas-tight electrical feedthroughs of lamp vessels. The ends 4c, bounded by cut edges 4b, of the molybdenum foil 4 sealed in the silica glass 1 are constructed according to the invention in the shape of a wedge. The wedge shape is produced by rolling the foil ends 4c. As a result, burrs on the cut edges 4b areeliminated, and the risk of the formation of cracks or flaws in the silica glass 1 is obviated.
Description
EXPRESS MAIL NO.: EM337 921 725US
ATTORNEY DOCKET NO.: 97P5537 MOLYBDENUM FOIL SEAL IN GLASS AND AN ELECTRIC LAMP
HAVING SUCH A MOLYBDENUM FOIL SEAL
This invention relates to a molybdenum foil seal in glass and an electric lamp having such a molybdenum foil seal and in particular to a molybdenum foil having at least one end which is constructed in the shape of a wedge.
I. Technical field Molybdenum foil seals in glass are necessary, for example, for gas-tight electrical feedthroughs in lamp vessels, consisting of silica glass, of high-pressure discharge lamps and halogen incandescent lamps. Here, silica glass denotes glasses whose silica dioxide component is at least 95 per cent by weight. Since the silica glass of the lamp vessel has a substantially smaller coefficient of thermal expansion than the supply leads, which project from the lamp vessel, are usually fabricated from molybdenum wire and are used to supply electric power to the lnminescent means arranged inside the lamp vessel, it is, to be specific, impossible for the supply lead wires to be sealeddirectly, that is to say without auxiliary measures, in a gas-tight fashion in the silica glass of the lamp vessel. In the case of heating of the lamp vessel, for example during operation of the lamp, the supply lead wires made from molybdenum would expand approximately ten times as strongly as the silica glass surrounding them. The mechanical stresses resulting therefrom would lead to cracks in the silica glass. However, despite the different coefficients of thermal e~pansion of silica glass and molybdenum and the mechanical stresses resulting therefrom, a gas-tight electrical feedthrough for lamp vessels can be produced with the aid of sufficiently thin molybdenum foils of sufficient ductility. For this purpose, the mutually opposite ends of the molybdenum foil are usually welded in each case to a supply lead wire made from molybdenum, and the constructional unit produced in this way is then positioned in the lamp vessel end to be sealed in such a way that one of the supply lead wires projectsinto the interior of the lamp vessel, while the other supply lead wire projects out of the lamp vessel. The silica glass of the lamp vessel end is then fused and the lamp vessel end is pinched tight, for example, by means of pmching jaws, over the constructional unit comprising the molybdenum foil and the supply leads. The molybdenum foil is then completely embedded in the silica glass of the lamp vessel end. The feedthrough comprising the supply leads and the EXPRESS MAIL NO.: EM337 921 725US
ATTORNEY DOCKET NO.: 97P5537 molybdenum foil is sealed in the lamp vessel end in a gas-tight fashion in the region of the molybdenum foil.
The molybdenum foil seals thus fulfil two different functions here. Firstly, they serve to produce an electrically conducting connection between the luminescent means arranged inside the lamp vessel and the supply leads projecting out of the lamp vessel, and secondly ensure a gas-tight closure of the lamp vessel. The molybdenum foils are usually cut off from a supply strip.
They therefore have a rectangular surface which is bounded by two side edges and two cut edges extending perpendicular to the side edges. The surfaces of the molybdenum foils are usually convexly cambered, that is to say the thickness of the molybdenum foils continuously decreases towards the side edges starting from the foil centre.
II. Prior art Patent specification US 4,587,454 has disclosed molybdenum foil seals in glass which, for the purpose of avoiding crack formation in the glass, have molybdenum foils with a surface roughened by sand-blast treatment. The molybdenum foils have a lancet-shaped cross-section, that is to say starting from a maximum value at the foil centre, the thickness of the foils decreases continuously in the direction of the two side edges of the foil, which extend inthe longitudinal direction, transverse to the foil cut edges.
German patent specification DE 29 47 230 describes molybdenum foil seals for sealing lamp vessels, which consist of at least 95% of silica glass. In order to reduce the formation of cracks in the glass, the molybdenum foils are provided with an yttrium oxide additive of 0.25 to 1 per cent by weight.
It has emerged that the formation of cracks in the glass surrounding the molybdenum foil seal cannot always be reliably prevented by the abovementioned measures belonging to the prior art. In particular, it was possible to establish that cracks frequently occurred in the glass surrounding the molybdenum foils at the ends, bounded by cut edges, of the molybdenum foils.
III. Summary of the invention EXPRESS MAIL NO.: EM337 921 725US
ATTORNEY DOCKET NO.: 97P5537 It is the object of the invention to provide a molybdenum foil seal in glass which do not have the abovementioned disadvantages. In particular, the aim is to reduce the risk of formation of cracks in the glass in the region of the molybdenum foil ends bounded by cut edges. It is also the object of the invention to provide an electric lamp with improved sealing of the lamp vessels in the region of the electrical feedthroughs.
These objects are achieved, in one aspect of the invention, by means of a molybdenum foil having a cut edge constructed in the shape of wedge.
In the inventive molybdenum foil seals in glass, the at least one end, bounded by a cut edge, of the molybdenum foil sealed in glass is constructed in the shape of a wedge. It is possible by means of this measure for burrs which have been formed on the cut edge when cutting the molybdenum foil from the supply strip to be elimin~te~l again, with the result that these burrs produced by cutting cannot cause cracks or flaws in the glass surrounding the molybdenum foil. The wedge shape of the molybdenum foil end bounded by a cut edge can advantageously be produced by rolling this molybdenum foil end. Any cut burrs on the cut edge of the molybdenum foil are smoothed by this rolling. The at least one molybdenum foil of the molybdenum foil seal according to the invention is advantageously bounded by two cut edges and two side edges extending transverse to the cut edges, and has a lancet-shaped cross-section parallel to the cut edges. It thereby acquires a convexly cambered surface which reduces the mechanical stresses in the molybdenum foil seal. The molybdenum foil seal according to the invention can be used with particular advantage for gas-tight sealing of electrical feedthroughs for lamp vessels of electric lamps.
IV. DESCRIPTION OF THE PREFERRED EMBODIMENTS
The invention is explained in more detail below with the aid of a preferred exemplary embodiment. In the drawings:
~igure 1 shows a top view of a feedthrough of a lamp vessel having a molybdenum foil seal according to the invention, in a diagrammatic representation EXPRESS MAIL NO.: EM337 921 725US
ATTORNEY DOCKET NO.: 97P5537 ~igure 2 shows a side view of the electrical feedthrough of the lamp vessel from Figure 1, in a diagrammatic representation Figure 3 shows a cross-section through the feedthrough from Figure 1 along the longitudinal axis A-A and perpendicular to the foil plane, in a diagrammatic representation and Figure 4 shows a cross-section through the feedthrough from Figure 1 along the line of section B-B and perpendicular to the foil plane, in a diagrammatic representation.
Figure 1 shows a pinch seal 1 for a lamp vessel 2, consisting of silica glass, of an electric lamp having an electrical feedthrough which has a molybdenum foil seal according to the invention. The electrical feedthrough comprises a supply lead wire 3 projecting out of the lamp vessel, a molybdenum foil 4 sealed in a gas-tight fashion in the silica glass of the pinch seal 1, and an electrode bar 6 projecting into the interior 5 of the lamp vessel 2. The supply lead wire 3 and electrode bar 6 also consist of molybdenum and are both welded to the molybdenum foil 4. The molybdenum foil 4 has a rectangular surface whose edge is formed by two mutually opposite cut edges 4b and by two side edges 4a extending in the longitudinal direction A-A, perpendicular to the cut edges 4b. The cut edges 4b are produced when the molybdenum foil 4 is cut from a supply strip. The surface of the molybdenum foil 4 is convexly cambered, that is to say starting from the foil centre its thickness decreases continuously to both side edges 4a, with the result that the molybdenum foil 4 has a lancet-shaped cross-section parallel to the cut edges 4b (Figure 4). The ends 4c, bounded by cut edges 4b, of the molybdenum foil 4 taper in the shape of a wedge. In order to produce the wedge shape, the foil ends 4c are rolled before the molybdenum foil 4 is welded to the supply lead wire 3 and the electrode bar 6. The welding point 7 between the electrode bar 6 and the molybdenum foil 4 or between the supply lead wire 3 and molybdenum foil 4 are located outside the wedge-shaped foil ends 4c. The representations of Figures 1 to 4 are not true to scale, but only diagrammatic. The thickness of the molybdenum foil 4 is approximately 20 ~lm in the foil centre. The diameters of the supply lead wire 3 and electrode bar 6 are more than 20 times larger than the foil thickness.
EXPRESS MAIL NO.: EM337 921 725US
ATTORNEY DOCKET NO.: 97P5537 In order to produce the molybdenum foil seal, a rectangular piece of molybdenum foil 4 is cut from a molybdenum strip arranged on a supply roll.
This molybdenum strip is already convexly cambered, that is to say, starting from the strip centre, its thickness decreases continuously towards its side edges. As a result, the molybdenum foil 4 also has the convex camber. In order to elimin~te burrs on the cut edges 4b of the molybdenum foil 4, the foil ends 4c are tapered in the shape of a wedge by rolling. The ends of the molybdenum foil 4 are welded outside the wedge-shaped regions 4c to the supply lead wire 3 and to the electrode bar 6, which likewise both consist of molybdenum. The constructional unit 3, 4, 6 thus produced is then inserted into the lamp vessel end to be sealed gas-tight. Subsequently, the silica glass 1 is softened in the region of the lamp vessel end by heating and pressed onto the molybdenum foil 4, for example by means of pinching jaws. After the silica glass 1 has become cold, the constructional unit comprising the supply lead wire 3, the electrode bar 6 and the molybdenum foils 4 forms an electrical feedthrough for the lamp vessel 2, which is sealed in a gas-tight fashion in the lamp vessel endin the region of the molybdenum foil 4.
ATTORNEY DOCKET NO.: 97P5537 MOLYBDENUM FOIL SEAL IN GLASS AND AN ELECTRIC LAMP
HAVING SUCH A MOLYBDENUM FOIL SEAL
This invention relates to a molybdenum foil seal in glass and an electric lamp having such a molybdenum foil seal and in particular to a molybdenum foil having at least one end which is constructed in the shape of a wedge.
I. Technical field Molybdenum foil seals in glass are necessary, for example, for gas-tight electrical feedthroughs in lamp vessels, consisting of silica glass, of high-pressure discharge lamps and halogen incandescent lamps. Here, silica glass denotes glasses whose silica dioxide component is at least 95 per cent by weight. Since the silica glass of the lamp vessel has a substantially smaller coefficient of thermal expansion than the supply leads, which project from the lamp vessel, are usually fabricated from molybdenum wire and are used to supply electric power to the lnminescent means arranged inside the lamp vessel, it is, to be specific, impossible for the supply lead wires to be sealeddirectly, that is to say without auxiliary measures, in a gas-tight fashion in the silica glass of the lamp vessel. In the case of heating of the lamp vessel, for example during operation of the lamp, the supply lead wires made from molybdenum would expand approximately ten times as strongly as the silica glass surrounding them. The mechanical stresses resulting therefrom would lead to cracks in the silica glass. However, despite the different coefficients of thermal e~pansion of silica glass and molybdenum and the mechanical stresses resulting therefrom, a gas-tight electrical feedthrough for lamp vessels can be produced with the aid of sufficiently thin molybdenum foils of sufficient ductility. For this purpose, the mutually opposite ends of the molybdenum foil are usually welded in each case to a supply lead wire made from molybdenum, and the constructional unit produced in this way is then positioned in the lamp vessel end to be sealed in such a way that one of the supply lead wires projectsinto the interior of the lamp vessel, while the other supply lead wire projects out of the lamp vessel. The silica glass of the lamp vessel end is then fused and the lamp vessel end is pinched tight, for example, by means of pmching jaws, over the constructional unit comprising the molybdenum foil and the supply leads. The molybdenum foil is then completely embedded in the silica glass of the lamp vessel end. The feedthrough comprising the supply leads and the EXPRESS MAIL NO.: EM337 921 725US
ATTORNEY DOCKET NO.: 97P5537 molybdenum foil is sealed in the lamp vessel end in a gas-tight fashion in the region of the molybdenum foil.
The molybdenum foil seals thus fulfil two different functions here. Firstly, they serve to produce an electrically conducting connection between the luminescent means arranged inside the lamp vessel and the supply leads projecting out of the lamp vessel, and secondly ensure a gas-tight closure of the lamp vessel. The molybdenum foils are usually cut off from a supply strip.
They therefore have a rectangular surface which is bounded by two side edges and two cut edges extending perpendicular to the side edges. The surfaces of the molybdenum foils are usually convexly cambered, that is to say the thickness of the molybdenum foils continuously decreases towards the side edges starting from the foil centre.
II. Prior art Patent specification US 4,587,454 has disclosed molybdenum foil seals in glass which, for the purpose of avoiding crack formation in the glass, have molybdenum foils with a surface roughened by sand-blast treatment. The molybdenum foils have a lancet-shaped cross-section, that is to say starting from a maximum value at the foil centre, the thickness of the foils decreases continuously in the direction of the two side edges of the foil, which extend inthe longitudinal direction, transverse to the foil cut edges.
German patent specification DE 29 47 230 describes molybdenum foil seals for sealing lamp vessels, which consist of at least 95% of silica glass. In order to reduce the formation of cracks in the glass, the molybdenum foils are provided with an yttrium oxide additive of 0.25 to 1 per cent by weight.
It has emerged that the formation of cracks in the glass surrounding the molybdenum foil seal cannot always be reliably prevented by the abovementioned measures belonging to the prior art. In particular, it was possible to establish that cracks frequently occurred in the glass surrounding the molybdenum foils at the ends, bounded by cut edges, of the molybdenum foils.
III. Summary of the invention EXPRESS MAIL NO.: EM337 921 725US
ATTORNEY DOCKET NO.: 97P5537 It is the object of the invention to provide a molybdenum foil seal in glass which do not have the abovementioned disadvantages. In particular, the aim is to reduce the risk of formation of cracks in the glass in the region of the molybdenum foil ends bounded by cut edges. It is also the object of the invention to provide an electric lamp with improved sealing of the lamp vessels in the region of the electrical feedthroughs.
These objects are achieved, in one aspect of the invention, by means of a molybdenum foil having a cut edge constructed in the shape of wedge.
In the inventive molybdenum foil seals in glass, the at least one end, bounded by a cut edge, of the molybdenum foil sealed in glass is constructed in the shape of a wedge. It is possible by means of this measure for burrs which have been formed on the cut edge when cutting the molybdenum foil from the supply strip to be elimin~te~l again, with the result that these burrs produced by cutting cannot cause cracks or flaws in the glass surrounding the molybdenum foil. The wedge shape of the molybdenum foil end bounded by a cut edge can advantageously be produced by rolling this molybdenum foil end. Any cut burrs on the cut edge of the molybdenum foil are smoothed by this rolling. The at least one molybdenum foil of the molybdenum foil seal according to the invention is advantageously bounded by two cut edges and two side edges extending transverse to the cut edges, and has a lancet-shaped cross-section parallel to the cut edges. It thereby acquires a convexly cambered surface which reduces the mechanical stresses in the molybdenum foil seal. The molybdenum foil seal according to the invention can be used with particular advantage for gas-tight sealing of electrical feedthroughs for lamp vessels of electric lamps.
IV. DESCRIPTION OF THE PREFERRED EMBODIMENTS
The invention is explained in more detail below with the aid of a preferred exemplary embodiment. In the drawings:
~igure 1 shows a top view of a feedthrough of a lamp vessel having a molybdenum foil seal according to the invention, in a diagrammatic representation EXPRESS MAIL NO.: EM337 921 725US
ATTORNEY DOCKET NO.: 97P5537 ~igure 2 shows a side view of the electrical feedthrough of the lamp vessel from Figure 1, in a diagrammatic representation Figure 3 shows a cross-section through the feedthrough from Figure 1 along the longitudinal axis A-A and perpendicular to the foil plane, in a diagrammatic representation and Figure 4 shows a cross-section through the feedthrough from Figure 1 along the line of section B-B and perpendicular to the foil plane, in a diagrammatic representation.
Figure 1 shows a pinch seal 1 for a lamp vessel 2, consisting of silica glass, of an electric lamp having an electrical feedthrough which has a molybdenum foil seal according to the invention. The electrical feedthrough comprises a supply lead wire 3 projecting out of the lamp vessel, a molybdenum foil 4 sealed in a gas-tight fashion in the silica glass of the pinch seal 1, and an electrode bar 6 projecting into the interior 5 of the lamp vessel 2. The supply lead wire 3 and electrode bar 6 also consist of molybdenum and are both welded to the molybdenum foil 4. The molybdenum foil 4 has a rectangular surface whose edge is formed by two mutually opposite cut edges 4b and by two side edges 4a extending in the longitudinal direction A-A, perpendicular to the cut edges 4b. The cut edges 4b are produced when the molybdenum foil 4 is cut from a supply strip. The surface of the molybdenum foil 4 is convexly cambered, that is to say starting from the foil centre its thickness decreases continuously to both side edges 4a, with the result that the molybdenum foil 4 has a lancet-shaped cross-section parallel to the cut edges 4b (Figure 4). The ends 4c, bounded by cut edges 4b, of the molybdenum foil 4 taper in the shape of a wedge. In order to produce the wedge shape, the foil ends 4c are rolled before the molybdenum foil 4 is welded to the supply lead wire 3 and the electrode bar 6. The welding point 7 between the electrode bar 6 and the molybdenum foil 4 or between the supply lead wire 3 and molybdenum foil 4 are located outside the wedge-shaped foil ends 4c. The representations of Figures 1 to 4 are not true to scale, but only diagrammatic. The thickness of the molybdenum foil 4 is approximately 20 ~lm in the foil centre. The diameters of the supply lead wire 3 and electrode bar 6 are more than 20 times larger than the foil thickness.
EXPRESS MAIL NO.: EM337 921 725US
ATTORNEY DOCKET NO.: 97P5537 In order to produce the molybdenum foil seal, a rectangular piece of molybdenum foil 4 is cut from a molybdenum strip arranged on a supply roll.
This molybdenum strip is already convexly cambered, that is to say, starting from the strip centre, its thickness decreases continuously towards its side edges. As a result, the molybdenum foil 4 also has the convex camber. In order to elimin~te burrs on the cut edges 4b of the molybdenum foil 4, the foil ends 4c are tapered in the shape of a wedge by rolling. The ends of the molybdenum foil 4 are welded outside the wedge-shaped regions 4c to the supply lead wire 3 and to the electrode bar 6, which likewise both consist of molybdenum. The constructional unit 3, 4, 6 thus produced is then inserted into the lamp vessel end to be sealed gas-tight. Subsequently, the silica glass 1 is softened in the region of the lamp vessel end by heating and pressed onto the molybdenum foil 4, for example by means of pinching jaws. After the silica glass 1 has become cold, the constructional unit comprising the supply lead wire 3, the electrode bar 6 and the molybdenum foils 4 forms an electrical feedthrough for the lamp vessel 2, which is sealed in a gas-tight fashion in the lamp vessel endin the region of the molybdenum foil 4.
Claims (5)
1. Molybdenum foil seal in glass, the molybdenum foil seal having the following features:
- at least one molybdenum foil (4) which has at least one end (4c) bounded by a cut edge (4b), - a glass member (1) whose glass consists of at least 95 per cent by weight of silicon dioxide and into which the at least one molybdenum foil (4) is sealed in a gas-tight fashion, - one or more metallic bars (6) or wires (3), which are connected to the at least one molybdenum foil (4), characterized in that the at least one end (4c), bounded by a cut edge (4b), of the at least one molybdenum foil (4) is constructed in the shape of a wedge.
- at least one molybdenum foil (4) which has at least one end (4c) bounded by a cut edge (4b), - a glass member (1) whose glass consists of at least 95 per cent by weight of silicon dioxide and into which the at least one molybdenum foil (4) is sealed in a gas-tight fashion, - one or more metallic bars (6) or wires (3), which are connected to the at least one molybdenum foil (4), characterized in that the at least one end (4c), bounded by a cut edge (4b), of the at least one molybdenum foil (4) is constructed in the shape of a wedge.
2. Molybdenum foil seal according to Claim 1, characterized in that the at least one molybdenum foil (4) is bounded by two cut edges (4b) and by two side edges (4a) extending transverse to the cut edges (4b), and has a lancet-shaped cross-section parallel to the cut edges (4b).
3. Molybdenum foil seal according to Claim 2, characterized in that both ends of the at least one molybdenum foil (4) which are bounded by cut edges (4b), are constructed in the shape of a wedge.
4. Electric lamp having one or more lamp vessels made from glass, a luminescent means enclosed in a lamp vessel, and electrical feedthroughs, having at least one molybdenum foil seal in accordance with Claim 1, characterized in that the glass member (1) is an end, sealed in a gas-tight fashion, of a lamp vessel (2), and the metallic bars (6) or wires (3) are supply leads for supplying power to the luminescent means.
5. Method for producing a molybdenum foil seal in accordance with Claim 1, characterized in that the wedge shape of the at least one end (4c), bounded by a cut edge (4b), of the at least one molybdenum foil (4) is produced by rolling.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19724544A DE19724544A1 (en) | 1997-06-11 | 1997-06-11 | Molybdenum foil sealing in glass and electric lamp with such a molybdenum foil sealing |
| DE19724544.7 | 1997-06-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2240230A1 true CA2240230A1 (en) | 1998-12-11 |
Family
ID=7832101
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002240230A Abandoned CA2240230A1 (en) | 1997-06-11 | 1998-06-10 | Molybdenum foil seal in glass and an electric lamp having such a molybdenum foil seal |
Country Status (8)
| Country | Link |
|---|---|
| EP (1) | EP0884763B1 (en) |
| JP (1) | JPH117918A (en) |
| KR (1) | KR100541506B1 (en) |
| CA (1) | CA2240230A1 (en) |
| DE (2) | DE19724544A1 (en) |
| ES (1) | ES2205318T3 (en) |
| HU (1) | HU221393B1 (en) |
| TW (1) | TW423025B (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4826402A (en) * | 1986-03-28 | 1989-05-02 | Nachtrieb Paul W | High-capacity centrifugal pump |
| JP3664972B2 (en) * | 2000-12-05 | 2005-06-29 | 株式会社小糸製作所 | Arc tube |
| JP3613239B2 (en) | 2001-12-04 | 2005-01-26 | ウシオ電機株式会社 | Short arc type ultra high pressure discharge lamp |
| EP1548788B1 (en) | 2003-12-22 | 2009-02-11 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Elektrode system for discharge lamp, discharge lamp comprising such electrode system and method of fabrication of such an electrode system |
| JP4320760B2 (en) | 2004-03-10 | 2009-08-26 | スタンレー電気株式会社 | Discharge lamp |
| DE102007020067B4 (en) | 2007-04-27 | 2013-07-18 | Osram Gmbh | Process for producing a molybdenum foil for lamp construction and molybdenum foil and lamp with molybdenum foil |
| DE102007055171A1 (en) | 2007-11-19 | 2009-05-20 | Osram Gesellschaft mit beschränkter Haftung | Molybdenum foil manufacturing method for use in current supply device for electrical lamp, involves coating surface of molybdenum foil with ruthenium containing material before blasting, where coating is performed using sputtering technique |
| WO2009106133A1 (en) * | 2008-02-27 | 2009-09-03 | Osram Gesellschaft mit beschränkter Haftung | Melting film, method for the production thereof, and lamp having such a film |
| JP2011049136A (en) * | 2009-07-29 | 2011-03-10 | Panasonic Corp | Method of manufacturing metal foil for high-pressure discharge lamp, high-pressure discharge lamp and display device |
| TW201341126A (en) | 2012-04-13 | 2013-10-16 | New Way Tools Co Ltd | Ratchet wrench capable of rotation in smaller angle |
| TW201412467A (en) * | 2012-09-20 | 2014-04-01 | New Way Tools Co Ltd | Easy-to-assemble ratchet wrench |
| TW201527052A (en) | 2014-01-15 | 2015-07-16 | New Way Tools Co Ltd | Easy-to-assembly ratchet wrench |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH258444A (en) * | 1949-03-05 | 1948-11-30 | Mineral S A | Gas discharge lamp. |
| BE517821A (en) * | 1952-02-23 | |||
| US2966607A (en) * | 1959-05-26 | 1960-12-27 | Duro Test Corp | High pressure short arc lamps and method of making same |
| GB1594976A (en) * | 1978-05-24 | 1981-08-05 | Gen Electric Co Ltd | High pressure electric discharge lamps |
| US4587454A (en) * | 1984-05-17 | 1986-05-06 | Gte Products Corporation | Incandescent lamp with improved press seal |
| KR100247669B1 (en) * | 1992-07-14 | 2000-03-15 | 요트.게.아. 롤페즈 | Electric lamp |
-
1997
- 1997-06-11 DE DE19724544A patent/DE19724544A1/en not_active Withdrawn
-
1998
- 1998-05-14 TW TW087107453A patent/TW423025B/en not_active IP Right Cessation
- 1998-05-19 EP EP98109117A patent/EP0884763B1/en not_active Expired - Lifetime
- 1998-05-19 DE DE59809061T patent/DE59809061D1/en not_active Expired - Lifetime
- 1998-05-19 ES ES98109117T patent/ES2205318T3/en not_active Expired - Lifetime
- 1998-06-10 HU HU9801316A patent/HU221393B1/en unknown
- 1998-06-10 JP JP17959398A patent/JPH117918A/en active Pending
- 1998-06-10 CA CA002240230A patent/CA2240230A1/en not_active Abandoned
- 1998-06-11 KR KR1019980021633A patent/KR100541506B1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| HUP9801316A2 (en) | 1999-01-28 |
| HU9801316D0 (en) | 1998-08-28 |
| EP0884763B1 (en) | 2003-07-23 |
| HU221393B1 (en) | 2002-09-28 |
| HUP9801316A3 (en) | 2001-02-28 |
| JPH117918A (en) | 1999-01-12 |
| DE19724544A1 (en) | 1998-12-17 |
| DE59809061D1 (en) | 2003-08-28 |
| EP0884763A2 (en) | 1998-12-16 |
| ES2205318T3 (en) | 2004-05-01 |
| EP0884763A3 (en) | 1999-03-17 |
| KR19990006871A (en) | 1999-01-25 |
| KR100541506B1 (en) | 2006-02-28 |
| TW423025B (en) | 2001-02-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |