WO2008072159A2 - Lamp with protected power supply wires reaching outside the lamp - Google Patents

Lamp with protected power supply wires reaching outside the lamp Download PDF

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Publication number
WO2008072159A2
WO2008072159A2 PCT/IB2007/054985 IB2007054985W WO2008072159A2 WO 2008072159 A2 WO2008072159 A2 WO 2008072159A2 IB 2007054985 W IB2007054985 W IB 2007054985W WO 2008072159 A2 WO2008072159 A2 WO 2008072159A2
Authority
WO
WIPO (PCT)
Prior art keywords
lamp
power supply
cement
wire
burner
Prior art date
Application number
PCT/IB2007/054985
Other languages
French (fr)
Other versions
WO2008072159A3 (en
Inventor
Godefridus C. Goverde
Constant Daems
Original Assignee
Koninklijke Philips Electronics N.V.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Koninklijke Philips Electronics N.V. filed Critical Koninklijke Philips Electronics N.V.
Publication of WO2008072159A2 publication Critical patent/WO2008072159A2/en
Publication of WO2008072159A3 publication Critical patent/WO2008072159A3/en

Links

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
    • H01J5/50—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
    • H01J5/58—Means for fastening the separate part to the vessel, e.g. by cement
    • 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 is related to a lamp whereby the burner of the lamp is fixed in the base part of the lamp by means of cement and whereby at least one power supply wire is embedded in said cement and reaches outside the lamp in order to be connected with an electric power supply member.
  • the base part of the lamp may comprise a cap, means for fixing the lamp in a lamp-holder and/or light reflector means in order to produce a light beam.
  • Cement is an appropriate connection means between the burner and the base part and it can resist the very high temperature of the burner of the lamp.
  • the light source of the burner can be positioned precisely at a predetermined location with respect to the base part of the lamp. The exact positioning of the light source with respect to the base part of the lamp may be important, in particular when the light source has to be located at a predetermined position with respect to a reflector in order to produce a predetermined light beam.
  • Such lamps can be used for automotive headlights or for beamers or projectors, etc.
  • the base part of the lamp comprises means for connecting the lead-in wires of the burner to electric power supply members, which power supply members are present in the lamp-holder.
  • said means for connecting the lead-in wires comprise at least one, but in most cases two power supply wires, which power supply wires are partly embedded in the cement and are reaching outside the base part of the lamp.
  • the power supply wire may be the same wire as the lead-in wire of the burner.
  • the power supply wires When the lamp is installed in the lamp-holder, the power supply wires have to be connected to the power supply members, for example by clamping means of the power supply members. Thereby, the power supply wire is bended towards the power supply member, and during that operation, the power supply wire may break, in particular when it is made of relative fragile material, such as molybdenum or other metals that are resistant against the very high temperatures of the lamp during operation.
  • the power supply wires can be carefully connected to the power supply members in such manner that the wires does not break.
  • the lamp in case the lamps are delivered as spare parts for that beamer, the lamp will be installed by the operator of the beamer, whereby there is a real chance of breakage of a power supply wire.
  • the object of the invention is a lamp whereby the burner of the lamp is fixed in the base part of the lamp by means of cement and whereby at least one power supply wire is embedded in said cement and reaches outside the lamp in order to be connected with an electric power supply member, whereby the chance of breakage of the power supply wire during installation of the lamp is substantially reduced.
  • At least a part of said power supply wire is surrounded by a coil of metal wire, whereby a part of said coil is embedded in the cement and another part reaches outside the cement. It has appeared that crashes in the power supply wires always occur near the location where the wire leaves the cement. Movement of the power supply wire may result in sharp bending of the wire at that location. When a coil of metal wire is wound around the power supply wire at that location, the wire cannot be bended sharply and the chance of breakage will be reduced to a minimum.
  • the base part of the lamp comprises a tube-like portion in which portion the burner is fixed by means of cement, whereby the burner extends outside the cement at one end of the tube-like portion and said at least one power supply wire extends outside the cement at the other end of the tube-like portion.
  • the power supply wire or wires leave the lamp at the end of the lamp opposite to the burner, where the temperature is lower than the very high temperature of the burner.
  • the base portion of the lamp comprises a reflector surrounding at least a portion of the burner.
  • the use of cement to fix the burner to the base part of the lamp enables an exact positioning of the burner with respect to the base part, and therewith to the reflector, when that reflector is a portion of the base part of the lamp.
  • two power supply wires are partly embedded in the cement, whereby both power supply wires are surrounded by a coil of metal wire, which coils are both partly embedded in the cement.
  • Many lamps are provided with two power supply wires, and preferably both wires are embedded in the cement of the lamp in the same way and near each other at the end of the lamp opposite to the burner.
  • the burner is a high-pressure gas discharge burner, whereby a pinch portion of the burner is embedded in the cement, which pinch portion comprises at least one lead-in wire, which lead-in wire is said power supply wire being partly embedded in the cement and reaching outside the lamp.
  • This preferred embodiment of the invention is preferably provided with a reflector. Thereby, an exact positioning of the light source with respect to the reflector can be achieved, also in case the shape of the pinch portion is varying a little.
  • the one or two lead-in wires can easily be used as power supply wires, because at least one of them is surrounded by the cement at the location where it leaves the embedded pinch portion.
  • Fig. 1 is a sectional view of the lamp; and Fig. 2 shows a detail of the lamp in sectional view.
  • Figure 1 shows the lamp assembly comprising a base part 1 and a burner 2.
  • the base part 1 is mainly made of glass (glass, glass-ceramic or quartz) and comprises a reflector 3, which reflector 3 is bell- shaped, whereby its central axis is in the plane of the drawing.
  • the reflector 3 is provided with a light reflecting coating on its parabolic-shaped inner surface 4.
  • the burner 2 is a high-pressure gas discharge burner and is present inside the reflector 3, so that the light source in the gas discharge space 5 of the burner 2 is located at or near the focus point of said parabolic shape.
  • Inside the gas discharge space 5 are two electrodes 6, 7, each being electrically connected through a molybdenum foil 8, 9 with lead- in wires 10, 11.
  • Each molybdenum foil 8, 9 is located in a sealed end portion or pinch portion
  • the burner 2 is attached to the base part 1 of the lamp through pinch portion
  • pinch portion 13 which pinch portion 13 is fixed in a tubular portion 14 of the base part 1, whereby it is embedded in cement 15 that is present in the cylindrical space in the tubular portion 14.
  • the lead-in wire 11 for supplying electric current to electrode 7 leaves the burner 2 through pinch portion 13, and is also embedded in the cement 15.
  • the end of lead-in wire 11 reaches outside the cement 15 in order to be connected with a power supply member (not shown), and thereby the lead-in wire 11 functions as a power supply wire of the lamp.
  • the other lead-in wire 10 leaves the pinch portion 12 at the other end of the burner 2 and is connected with electric conductor wire 16.
  • Conductor wire 16 is embedded in the cement 15, where it is connected to the end of power supply wire 17.
  • the other end of power supply wire 17 reaches outside the cement 15 in order to be connected with a power supply member (not shown).
  • Lead-in wire 11 as well as power supply wire 17 is surrounded by a coil 18, 19 of metal wire at the location where the lead-in wire 11 and the power supply wire 17 respectively leave the cement.
  • the coils 18, 19 are partly embedded in the cement 15 and reach outside the cement 15.
  • Figure 2 shows the lead-in wire 11 being partly embedded in the cement 15 and being surrounded by coil 18. Thereby, the coil 18 is shown in a sectional view. From figure 2 it will be clear that the lead-in wire 11 cannot be bended in a sharp curve at the location where the coil 18 is present, so that the risk of breakage at that location is reduced.

Abstract

The invention relates to a lamp whereby the burner (2) of the lamp is fixed in the base part (1) of the lamp by means of cement (15) and whereby at least one power supply wire (11,17) is embedded in said cement (15) and reaches outside the lamp in order to be connected with an electric power supply member. According to the invention at least a part of 5 said power supply wire (11,17) is surrounded by a coil (18,19) of metal wire, whereby a part of said coil (18,19) is embedded in the cement (15) and another part reaches outside the cement (15).

Description

A lamp with power supply wires reaching outside the lamp
FIELD OF THE INVENTION
The invention is related to a lamp whereby the burner of the lamp is fixed in the base part of the lamp by means of cement and whereby at least one power supply wire is embedded in said cement and reaches outside the lamp in order to be connected with an electric power supply member.
BACKGROUND OF THE INVENTION
It is generally known to make use of cement in order to fix the burner of a lamp in the base part of the lamp. The base part of the lamp may comprise a cap, means for fixing the lamp in a lamp-holder and/or light reflector means in order to produce a light beam. Cement is an appropriate connection means between the burner and the base part and it can resist the very high temperature of the burner of the lamp. By means of cement, the light source of the burner can be positioned precisely at a predetermined location with respect to the base part of the lamp. The exact positioning of the light source with respect to the base part of the lamp may be important, in particular when the light source has to be located at a predetermined position with respect to a reflector in order to produce a predetermined light beam. Such lamps can be used for automotive headlights or for beamers or projectors, etc.
The base part of the lamp comprises means for connecting the lead-in wires of the burner to electric power supply members, which power supply members are present in the lamp-holder. In the lamp according to the invention said means for connecting the lead-in wires comprise at least one, but in most cases two power supply wires, which power supply wires are partly embedded in the cement and are reaching outside the base part of the lamp. The power supply wire may be the same wire as the lead-in wire of the burner.
When the lamp is installed in the lamp-holder, the power supply wires have to be connected to the power supply members, for example by clamping means of the power supply members. Thereby, the power supply wire is bended towards the power supply member, and during that operation, the power supply wire may break, in particular when it is made of relative fragile material, such as molybdenum or other metals that are resistant against the very high temperatures of the lamp during operation. In case the lamps are installed in, for example, a beamer during the assembling operation of the beamer, the power supply wires can be carefully connected to the power supply members in such manner that the wires does not break. However, in case the lamps are delivered as spare parts for that beamer, the lamp will be installed by the operator of the beamer, whereby there is a real chance of breakage of a power supply wire.
SUMMARY OF THE INVENTION
The object of the invention is a lamp whereby the burner of the lamp is fixed in the base part of the lamp by means of cement and whereby at least one power supply wire is embedded in said cement and reaches outside the lamp in order to be connected with an electric power supply member, whereby the chance of breakage of the power supply wire during installation of the lamp is substantially reduced.
In order to accomplish with that object, at least a part of said power supply wire is surrounded by a coil of metal wire, whereby a part of said coil is embedded in the cement and another part reaches outside the cement. It has appeared that crashes in the power supply wires always occur near the location where the wire leaves the cement. Movement of the power supply wire may result in sharp bending of the wire at that location. When a coil of metal wire is wound around the power supply wire at that location, the wire cannot be bended sharply and the chance of breakage will be reduced to a minimum. In a preferred embodiment, the base part of the lamp comprises a tube-like portion in which portion the burner is fixed by means of cement, whereby the burner extends outside the cement at one end of the tube-like portion and said at least one power supply wire extends outside the cement at the other end of the tube-like portion. Thereby the power supply wire or wires leave the lamp at the end of the lamp opposite to the burner, where the temperature is lower than the very high temperature of the burner.
Preferably, the base portion of the lamp comprises a reflector surrounding at least a portion of the burner. As said before, the use of cement to fix the burner to the base part of the lamp enables an exact positioning of the burner with respect to the base part, and therewith to the reflector, when that reflector is a portion of the base part of the lamp. In a preferred embodiment, two power supply wires are partly embedded in the cement, whereby both power supply wires are surrounded by a coil of metal wire, which coils are both partly embedded in the cement. Many lamps are provided with two power supply wires, and preferably both wires are embedded in the cement of the lamp in the same way and near each other at the end of the lamp opposite to the burner. Preferably, the burner is a high-pressure gas discharge burner, whereby a pinch portion of the burner is embedded in the cement, which pinch portion comprises at least one lead-in wire, which lead-in wire is said power supply wire being partly embedded in the cement and reaching outside the lamp. This preferred embodiment of the invention is preferably provided with a reflector. Thereby, an exact positioning of the light source with respect to the reflector can be achieved, also in case the shape of the pinch portion is varying a little. Furthermore, the one or two lead-in wires can easily be used as power supply wires, because at least one of them is surrounded by the cement at the location where it leaves the embedded pinch portion.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be further elucidated by means of a description of an embodiment of a high-pressure gas discharge lamp, whereby two power supply wires reach outside the lamp in order to be connected with electric power supply members, whereby reference is made to the drawing comprising schematic representations, whereby: Fig. 1 is a sectional view of the lamp; and Fig. 2 shows a detail of the lamp in sectional view.
DETAILED DESCRIPTION OF THE EMBODIMENTS Figure 1 shows the lamp assembly comprising a base part 1 and a burner 2.
The base part 1 is mainly made of glass (glass, glass-ceramic or quartz) and comprises a reflector 3, which reflector 3 is bell- shaped, whereby its central axis is in the plane of the drawing. The reflector 3 is provided with a light reflecting coating on its parabolic-shaped inner surface 4. The burner 2 is a high-pressure gas discharge burner and is present inside the reflector 3, so that the light source in the gas discharge space 5 of the burner 2 is located at or near the focus point of said parabolic shape. Inside the gas discharge space 5 are two electrodes 6, 7, each being electrically connected through a molybdenum foil 8, 9 with lead- in wires 10, 11. Each molybdenum foil 8, 9 is located in a sealed end portion or pinch portion
12, 13 of the burner 2, whereby the two pinch portions 12, 13 extend outwardly in opposite directions, substantially along the central axis of the base part 1.
The burner 2 is attached to the base part 1 of the lamp through pinch portion
13, which pinch portion 13 is fixed in a tubular portion 14 of the base part 1, whereby it is embedded in cement 15 that is present in the cylindrical space in the tubular portion 14. The lead-in wire 11 for supplying electric current to electrode 7 leaves the burner 2 through pinch portion 13, and is also embedded in the cement 15. The end of lead-in wire 11 reaches outside the cement 15 in order to be connected with a power supply member (not shown), and thereby the lead-in wire 11 functions as a power supply wire of the lamp.
The other lead-in wire 10 leaves the pinch portion 12 at the other end of the burner 2 and is connected with electric conductor wire 16. Conductor wire 16 is embedded in the cement 15, where it is connected to the end of power supply wire 17. The other end of power supply wire 17 reaches outside the cement 15 in order to be connected with a power supply member (not shown). Lead-in wire 11 as well as power supply wire 17 is surrounded by a coil 18, 19 of metal wire at the location where the lead-in wire 11 and the power supply wire 17 respectively leave the cement. The coils 18, 19 are partly embedded in the cement 15 and reach outside the cement 15.
Figure 2 shows the lead-in wire 11 being partly embedded in the cement 15 and being surrounded by coil 18. Thereby, the coil 18 is shown in a sectional view. From figure 2 it will be clear that the lead-in wire 11 cannot be bended in a sharp curve at the location where the coil 18 is present, so that the risk of breakage at that location is reduced.
The embodiment as described above is merely an example of a lamp assembly according to the invention; many other embodiments are possible.
LIST OF REFERENCE NUMERALS:
1. base part of the lamp
2. burner of the lamp
3. reflector
4. reflecting surface of the reflector 3
5. gas discharge space of the burner 2
6. electrode
7. electrode
8. molybdenum foil
9. molybdenum foil
10. lead-in wire
11. lead-in wire
12. sealed pinch portion
13. sealed pinch portion
14. tubular portion of base part 1
15. cement
16. conductor wire
17. power supply wire
18. coil of metal wire
19. coil of metal wire

Claims

CLAIMS:
1. A lamp whereby the burner (2) of the lamp is fixed in the base part (1) of the lamp by means of cement (15) and whereby at least one power supply wire (11,17) is embedded in said cement (15) and reaches outside the lamp in order to be connected with an electric power supply member, characterized in that at least a part of said power supply wire (11,17) is surrounded by a coil (18,19) of metal wire, whereby a part of said coil (18,19) is embedded in the cement (15) and another part reaches outside the cement (15).
2. A lamp as claimed in claim 1, characterized in that the base part (1) of the lamp comprises a tube-like portion (14) in which portion (14) the burner (2) is fixed by means of cement (15), whereby the burner (2) extends outside the cement (15) at one end of the tube-like portion (14) and said at least one power supply (11,17) wire extends outside the cement (15) at the other end of the tube-like portion (14).
3. A lamp as claimed in any one of the preceding claims, characterized in that the base part (1) of the lamp comprises a reflector (3) surrounding at least a portion of the burner
(2).
4. A lamp as claimed in any one of the preceding claims, characterized in that two power supply wires (11,17) are partly embedded in the cement (15), whereby both power supply wires (11,17) are surrounded by a coil (18,19) of metal wire, which coils (18,19) are both partly embedded in the cement (15).
5. A lamp as claimed in any one of the preceding claims, characterized in that the burner (2) is a high-pressure gas discharge burner, whereby a pinch portion (13) of the burner (2) is embedded in the cement (15), which pinch portion (13) comprises at least one lead-in wire (11), which lead-in wire (11) is said power supply wire being partly embedded in the cement (15) and reaching outside the lamp.
PCT/IB2007/054985 2006-12-13 2007-12-10 Lamp with protected power supply wires reaching outside the lamp WO2008072159A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP06126027 2006-12-13
EP06126027.9 2006-12-13

Publications (2)

Publication Number Publication Date
WO2008072159A2 true WO2008072159A2 (en) 2008-06-19
WO2008072159A3 WO2008072159A3 (en) 2008-08-14

Family

ID=39427637

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2007/054985 WO2008072159A2 (en) 2006-12-13 2007-12-10 Lamp with protected power supply wires reaching outside the lamp

Country Status (2)

Country Link
TW (1) TW200833534A (en)
WO (1) WO2008072159A2 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3700881A (en) * 1971-04-29 1972-10-24 Gen Electric Lamp and reflector assembly
US4633136A (en) * 1982-04-20 1986-12-30 Patent-Treuhand-Gesellschaft Fur Elektrische Gluhlampen Mbh High-pressure discharge lamp with low power input
US4833576A (en) * 1987-09-29 1989-05-23 General Electric Company Aluminum phosphate cement compositions and lamp assemblies containing same

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3700881A (en) * 1971-04-29 1972-10-24 Gen Electric Lamp and reflector assembly
US4633136A (en) * 1982-04-20 1986-12-30 Patent-Treuhand-Gesellschaft Fur Elektrische Gluhlampen Mbh High-pressure discharge lamp with low power input
US4833576A (en) * 1987-09-29 1989-05-23 General Electric Company Aluminum phosphate cement compositions and lamp assemblies containing same

Also Published As

Publication number Publication date
WO2008072159A3 (en) 2008-08-14
TW200833534A (en) 2008-08-16

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