WO2001073807A1 - Electric lamp - Google Patents
Electric lamp Download PDFInfo
- Publication number
- WO2001073807A1 WO2001073807A1 PCT/EP2001/002919 EP0102919W WO0173807A1 WO 2001073807 A1 WO2001073807 A1 WO 2001073807A1 EP 0102919 W EP0102919 W EP 0102919W WO 0173807 A1 WO0173807 A1 WO 0173807A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- lamp
- electric
- current supply
- aluminum
- connection body
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01K—ELECTRIC INCANDESCENT LAMPS
- H01K1/00—Details
- H01K1/42—Means forming part of the lamp for the purpose of providing electrical connection, or support for, the lamp
- H01K1/46—Means forming part of the lamp for the purpose of providing electrical connection, or support for, the lamp supported by a separate part, e.g. base, cap
-
- 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
- H01J5/50—Means forming part of the tube or lamps for the purpose of providing electrical connection to it
- H01J5/54—Means forming part of the tube or lamps for the purpose of providing electrical connection to it supported by a separate part, e.g. base
- H01J5/62—Connection of wires protruding from the vessel to connectors carried by the separate part
Definitions
- the invention relates to an electric lamp comprising a light-transmitting lamp vessel, an electric element in the lamp vessel, current supply conductors extending to the electric element, a lamp cap connected to the lamp vessel, which lamp cap has a shell portion and a base portion which each support an electric contact member, each electric contact member having a surface on which the respective current supply conductor is fastened by means of a solidified connection body comprising aluminum and an additive.
- Such an electric lamp is known, for example, from EP-406 948 Bl.
- the known lamp has a lamp cap with a conventional flat plate which is anchored in the base portion as a contact member through which a current supply conductor issues to the exterior.
- the connection body is a droplet of metal, of aluminum, by means of which the current supply conductor was fixed to the plate in a welding operation.
- the aluminum metal droplet may comprise, for example, iron or manganese, as a metal additive.
- a disadvantage of the known lamp is that the aluminum metal droplet, whether or not comprising such an additive, has a melting point which is comparatively high compared with the melting point of the shell portion.
- the further contact member and/or current supply conductor is thermally comparatively strongly loaded when a metal droplet having a comparatively high melting point is used. Given such a high thermal load, there is the risk of a bad electrical contact between the current supply conductor and the plate of the contact member, and there is also a risk of local deformation and or melting of the base portion.
- the invention has for its object to provide a lamp of the kind described in the opening paragraph in which the above disadvantages are counteracted.
- the electric lamp of the kind described in the opening paragraph is characterized in that the additive comprises 5 to 16% by weight of silicon.
- the addition of silicon in a quantity of 5 to 16% by weight to the aluminum, referred to as AlSi for short, has the advantage that the connection body has a melting point which is at least 30 °C lower than the melting point of aluminum of, for example, the shell portion. Such a lower melting point is favorable because the welding/brazing joint can be made in a process at comparatively low temperatures, so that the risk of rejects during lamp assembly is reduced.
- AlSi has the advantage that it was found to be comparatively well-resistant to electrochemical corrosion.
- AlSi also has the advantage that a good adhesion/wetting of the connection body made of this material with respect to the base portion and the shell portion, for example made of aluminum, is achieved. A robust connection of the current supply conductor to the contact member of the shell portion can thus be realized with AlSi.
- aluminum and silicon have the advantage that both materials are comparatively inexpensive.
- the AlSi may comprise small quantities, for example up to 0.6% by weight, of impurities or additives such as Ti, Mn, Mg, Zn, Cu, and Fe, which do not detract from the favorable properties of the welded/brazed joint and which in some cases may achieve a further lowering of the melting point of AlSi.
- the lamp cap of the lamp according to the invention may be a conventional Edison or a conventional Swan lamp cap with a conventional flat plate as the contact member, anchored in the base portion of the lamp cap.
- Both the plate and the shell portion of the lamp cap may be made of a conventional material, such as aluminum, aluminum alloys, brass, or nickel-plated brass.
- the silicon additive accounts for a quantity of 11 to 13.5% by weight.
- the AlSi then complies with DIN 1732, and the addition of silicon to aluminum in this quantity leads to a connection body with a melting point which is at least 60 °C lower than the melting point of aluminum.
- the melting point of such a connection body is 600 °C or less, whereby the risk of rejects during the creation of the welded joint in lamp assembly is further reduced.
- Aluminum forms a eutectic mixture with silicon, a lowest melting point of the eutectic mixture of approximately 577 °C being reached for a quantity of Si in Al of approximately 12.5% by weight. This eutectic mixture is generally known as AlSi 12.
- AlSi 12 is highly suitable for applications at comparatively high temperatures because of its comparatively high melting point.
- AlSi 12 is also highly suitable for lamps with shell portions made of aluminum where, in contrast to soldering, a fusion takes place between the connection body and the shell portion at the boundary surface. Since the melting point of AlSi 12 is significantly lower than that of aluminum, i.e. 577 °C and 660 °C, respectively, there is at least substantially no risk of an unacceptably high degree of fusion of the shell portion.
- the thermal load on said conductor will have been much greater in a welded joint obtained by a conventional connection method, for example through the application of an electric arc to the current supply conductor and melting of this conductor without the use of a supplied additional material. Moreover, there is only a very small contact surface area between the current supply conductor and the electric contact member because no supplied material was used. This means that the conventional method involves a considerable risk of a bad electrical contact between the current supply conductor and the electric contact member, and a subsequent interruption of this electrical contact.
- the lamp may be an electric discharge lamp or an incandescent lamp.
- the electric element, an incandescent body in the case of an incandescent lamp may be enclosed in an inner envelope in the lamp vessel.
- the lamp vessel i.e. the inner envelope, if present, will contain a filling comprising a halogen.
- An inner envelope will usually be present if the electric element is a pair of electrodes in an ionizable gas.
- the lamp vessel may be partly reflectorized. Alternatively, the lamp vessel may be connected to a reflector body which partly surrounds the lamp vessel.
- Fig. 1 shows a discharge lamp in side elevation
- Fig. 2 is an elevation of the base portion of the lamp cap of Fig. 1
- Fig. 3 shows an incandescent lamp in side elevation
- Fig. 4 is an elevation of the base portion of the lamp cap of Fig. 3, and
- Fig. 5 is a cross-sectional view of the lamp cap of Figs. 3 and 4 on an enlarged scale.
- the lamp of Fig. 1 has a light-transmitting lamp vessel 1 in which an electric element 2, a pair of electrodes, is arranged.
- the pair of electrodes in the Figure is surrounded by an inner envelope 3 which is filled with an ionizable gas such as neon/argon and sodium vapor.
- Current supply conductors 4, 5 extend to the electric element 2.
- a lamp cap 6 having a shell portion 7 and a base portion 8 supporting an electric contact member 9 is connected to the lamp vessel 1.
- the electric contact member 9 has a surface through which a current supply conductor 4, 5 issues to the exterior and on which said current supply conductor is secured.
- the base portion 8 of the lamp cap 6 has two contact members 9 (see also Fig. 2), each comprising a flat, oval brass plate.
- the lamp cap 6 shown is a conventional lamp cap with B-22 fit and conventional contact members 9.
- the current supply conductors 4, 5 shown are made of copper at the areas of the contact members 9.
- a solidified connection body 10 substantially made of aluminum with 5 to 16% by weight of an additive, i.e. of Si.
- connection body 10 in the lamp as drawn comprises aluminum with 10% by weight of silicon added thereto.
- the connection body 10 is in contact with the corresponding contact member 9 substantially with a circular boundary.
- connection body 30 is made of a eutectic mixture AlSi 12, i.e. aluminum with 12.5% by weight of silicon as the additive, and has a flattened shape with a hemispherically curved free surface and with a substantially circular contact surface for the contact member 29. A skin of the contact member was melted at said contact surface and fused to the connection body 30.
- a skin of the current supply conductor 25 comprising 28.5% Cu, 68.5% Ni, 1.5% Fe, and 1.5% Mn by weight and acting as a fuse in this location, which was liquefied and fused to the connection body.
- the current supply conductor 24 is fastened to the shell 27 of the lamp cap 26 in a location 32 by means of a solidified connection body 32 of aluminum with 12.5 % by weight of silicon as the additive.
- This connection wire is also a fuse wire, for example having the same composition as the current supply conductor 25.
- the shell 27 of the lamp cap 26 is made of aluminum, but it may alternatively be made of, for example, brass, nickel-plated brass, etc.
- the shell 27 of the lamp cap 26 was only superficially fused at the area of the contact surface owing to the connection body 32 being provided thereon and was not deformed, and the skin of the current supply conductor 24 was similarly fused to the connection body 32.
- the connection technique used was brazing with a hydrogen microflame (commercially known as SPIR flame), and the brazing flux used for this was Castolin 190.
- the lamp vessel 21 has a partial reflectorization 23.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP01936077A EP1194945A1 (en) | 2000-03-28 | 2001-03-15 | Electric lamp |
JP2001571438A JP2003529191A (en) | 2000-03-28 | 2001-03-15 | lamp |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP00201114 | 2000-03-28 | ||
EP00201114.6 | 2000-03-28 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001073807A1 true WO2001073807A1 (en) | 2001-10-04 |
Family
ID=8171264
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2001/002919 WO2001073807A1 (en) | 2000-03-28 | 2001-03-15 | Electric lamp |
Country Status (5)
Country | Link |
---|---|
US (1) | US20010038266A1 (en) |
EP (1) | EP1194945A1 (en) |
JP (1) | JP2003529191A (en) |
CN (1) | CN1196159C (en) |
WO (1) | WO2001073807A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20120256813A1 (en) * | 2011-04-11 | 2012-10-11 | General Electric Company | Low temperature contact structure for flexible solid state device |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2736873A (en) * | 1951-12-01 | 1956-02-28 | Gen Electric | Lamp base connection and method of manufacture |
US3885186A (en) * | 1973-06-04 | 1975-05-20 | Thorn Electrical Ind Ltd | Lamp cap connections using superplastic alloy |
EP0406948A1 (en) * | 1989-07-04 | 1991-01-09 | Koninklijke Philips Electronics N.V. | Electric lamp |
US5286314A (en) * | 1991-04-29 | 1994-02-15 | Alliedsignal Inc. | Rapidly solidified aluminum-germanium base brazing alloys |
US5418072A (en) * | 1993-09-20 | 1995-05-23 | Alcan International Limited | Totally consumable brazing encapsulate for use in joining aluminum surfaces |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1650289A (en) * | 1926-12-10 | 1927-11-22 | James B Mcginley | Incandescent electric lamp |
US5100048A (en) * | 1991-01-25 | 1992-03-31 | Alcan International Limited | Method of brazing aluminum |
-
2001
- 2001-03-15 CN CNB018013155A patent/CN1196159C/en not_active Expired - Fee Related
- 2001-03-15 WO PCT/EP2001/002919 patent/WO2001073807A1/en not_active Application Discontinuation
- 2001-03-15 JP JP2001571438A patent/JP2003529191A/en active Pending
- 2001-03-15 EP EP01936077A patent/EP1194945A1/en not_active Withdrawn
- 2001-03-26 US US09/817,085 patent/US20010038266A1/en not_active Abandoned
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2736873A (en) * | 1951-12-01 | 1956-02-28 | Gen Electric | Lamp base connection and method of manufacture |
US3885186A (en) * | 1973-06-04 | 1975-05-20 | Thorn Electrical Ind Ltd | Lamp cap connections using superplastic alloy |
EP0406948A1 (en) * | 1989-07-04 | 1991-01-09 | Koninklijke Philips Electronics N.V. | Electric lamp |
US5286314A (en) * | 1991-04-29 | 1994-02-15 | Alliedsignal Inc. | Rapidly solidified aluminum-germanium base brazing alloys |
US5418072A (en) * | 1993-09-20 | 1995-05-23 | Alcan International Limited | Totally consumable brazing encapsulate for use in joining aluminum surfaces |
Also Published As
Publication number | Publication date |
---|---|
JP2003529191A (en) | 2003-09-30 |
EP1194945A1 (en) | 2002-04-10 |
CN1196159C (en) | 2005-04-06 |
US20010038266A1 (en) | 2001-11-08 |
CN1381064A (en) | 2002-11-20 |
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