EP0321867A2 - Lampe à décharge à haute pression - Google Patents

Lampe à décharge à haute pression Download PDF

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Publication number
EP0321867A2
EP0321867A2 EP88121024A EP88121024A EP0321867A2 EP 0321867 A2 EP0321867 A2 EP 0321867A2 EP 88121024 A EP88121024 A EP 88121024A EP 88121024 A EP88121024 A EP 88121024A EP 0321867 A2 EP0321867 A2 EP 0321867A2
Authority
EP
European Patent Office
Prior art keywords
outer bulb
discharge lamp
pressure discharge
base
power supply
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP88121024A
Other languages
German (de)
English (en)
Other versions
EP0321867A3 (fr
EP0321867B1 (fr
Inventor
Manfred Gaugel
Rolf Kiesel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Osram GmbH
Original Assignee
Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
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 Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH filed Critical Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
Publication of EP0321867A2 publication Critical patent/EP0321867A2/fr
Publication of EP0321867A3 publication Critical patent/EP0321867A3/fr
Application granted granted Critical
Publication of EP0321867B1 publication Critical patent/EP0321867B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H01J5/56—Shape of the separate part
    • 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

Definitions

  • the invention is based on a high-pressure discharge lamp according to the preamble of claim 1.
  • Such lamps usually have a relatively low power (order of magnitude 100 W) and are suitable, for example, for indoor lighting. For various reasons, however, the fitting of car headlights with these lamps has become the focus of interest.
  • EP-PA 86 305 398 a high-pressure metal vapor discharge lamp for motor vehicle headlights, which is to be capped on one side, is known, in which the current supply led to the end of the discharge vessel squeezed on both sides is arranged inside the outer bulb.
  • a heating element is also housed in the outer bulb filled with nitrogen.
  • the disadvantage of this arrangement is that the diameter of the outer bulb and thus also the base must be dimensioned relatively generously in order to be able to accommodate the recirculated power supply.
  • flashovers can easily occur between the two adjacent power supply lines when the lamp is ignited, since high voltage is required for this.
  • motor vehicle discharge lamps with a base on one side which use discharge vessels that are pinched on both sides without an outer bulb (DE-OS 33 41 846).
  • the power supply connected to the end of the discharge vessel remote from the base is in this case led back along the discharge vessel to the base.
  • the ignition behavior of the lamp is problematic since the high voltage required for this can easily lead to flashovers between the unprotected power supplies.
  • the free end of the discharge vessel, which is remote from the base is not supported and is therefore insufficiently protected against vibrations.
  • the invention is able to combine the advantages of the two embodiments described above, without having the disadvantages.
  • the outer bulb facilitates the handling of the lamp and offers protection against an explosion of the discharge vessel and protection against contact.
  • the second power supply is advantageously connected to ground.
  • the arrangement according to the invention makes it possible to keep the dimensions of the lamp very small, which is in keeping with the trend towards small headlights.
  • the fact that the outer bulb separates the discharge vessel and the second power supply remote from the base creates, on the one hand, additional insulation with regard to high-voltage flashovers and, in addition, additional protection against the known
  • the problem of Na diffusion is made possible because the now greater possible distance between the second power supply and the discharge vessel corresponds to a smaller solid angle, so that the load on the power supply becomes smaller.
  • an outer bulb made of tempered glass can now prevent the emission of UV quanta in the direction of the second power supply.
  • An improved protection against vibrations is achieved by holding the second power supply in the end of the outer bulb remote from the base.
  • the start-up behavior in particular and the energy balance in general are improved by the heat accumulation effect of an outer bulb, particularly when it is evacuated.
  • the outer bulb offers an elegant possibility to apply an optical coating, for example a possible shading layer and / or a colored layer.
  • the second power supply is particularly advantageously divided into two parts, since this simplifies the manufacture and adjustment of the lamp.
  • the outer bulb and the discharge vessel are made of different materials with very different coefficients of thermal expansion (for example hard glass or quartz glass), this is the case partly to provide the second power supply within the outer bulb with an expansion loop.
  • FIGS. 1 and 2 show a motor vehicle discharge lamp 1 with a discharge vessel 3 made of quartz glass, which is squeezed on both sides, and an evacuated cylindrical outer bulb 2 made of hard glass, which is aligned approximately in the axis of the discharge vessel 3.
  • the discharge vessel 3 contains two axially aligned electrodes 4, the electrical connection of which to the outside takes place in each case via a shaft 5, a molybdenum foil 6 and a feed line 7.
  • the filling of the discharge Vessel 3 contains a noble gas 1 mg mercury and 0.3 mg halides of Na, Sc and Tl.
  • the outer bulb 2 has two ends 8, 9, each of which is closed in a vacuum-tight manner by a pinch seal. The melted pump tip 10 is attached laterally in the vicinity of the second end 9.
  • a first power supply line 11 is melted into the first end 8 and is connected to the closest supply line 7a of the discharge vessel 3.
  • the first end 8 is held in a two-part base 12, consisting of a metal cup 13 which is latched to the pinch seal of the first end 8 and which in turn is fastened in a receptacle 14 of a cylindrical plastic body 15 by means of HF welding.
  • Two contact elements 16, 17 are embedded in the plastic body 15, which produce a high-voltage-insulated and reverse-polarity-proof connection to an external power supply.
  • the first power supply 11 is welded to the first contact element 16, via which the high voltage is fed in during the ignition of the lamp.
  • a second power supply 18 connects the second supply line 7b of the discharge vessel to the second contact element 17.
  • the second power supply 18 is expediently divided into two parts, a melting part 19 and a return part 20.
  • the melting part 19 initially forms a U-shaped one Expansion loop 21 and is then guided axially through the second end 9 of the outer bulb 2 remote from the base, where it is melted vacuum-tight into the pinch seal of the second end 9.
  • the melting part 19 is made of molybdenum, so that an adaptation to the thermal expansion coefficient of tempered glass is guaranteed.
  • Outside of the outer bulb is a right with the melting part 19 End piece 22 of the return part 20, which extends at an angle to the lamp axis and is otherwise returned parallel to the lamp axis along the outer bulb as far as the second contact element 17. This parallel guidance is particularly space-saving.
  • the return part 20 is made of stainless steel wire. It has an annular expansion loop 23 at the bend to the end piece 22 and is encased in its axially parallel section by a ceramic capillary tube 24 which, for HV insulation, still protrudes far into the plastic body 15.
  • the longitudinal axis of the outer bulb is shifted somewhat parallel to the longitudinal axis of the discharge vessel (cf. FIG. 2).
  • the shift is in the order of 0.5 to 1 mm.
  • the pinch seal of the discharge vessel and the outer bulb are rotated by 90 ° to save space.
  • FIGS. 1 and 2 The embodiment of a high-pressure discharge lamp according to the invention shown in FIGS. 1 and 2, which is preferably suitable for installation in motor vehicle headlights (with the lamp axis lying horizontally), is distinguished by particular simplicity in terms of production technology off, since all four melts on the lamp are made using the same technique (pinch seal).
  • the pump tip attached to the side can be optically disruptive.
  • the glass mass concentrated in the pinch seal at the end remote from the base due to the long "lever path" can make it more difficult to suppress vibrations.
  • FIG. 3 shows a second preferred embodiment of the high-pressure discharge lamp according to the invention.
  • the construction of this lamp corresponds almost completely to the lamp shown in FIGS. 1 and 2.
  • the same features are provided with a 30 reference number.
  • the second end 39 of the outer bulb 32 (made of tempered glass) remote from the base is shaped into a dome.
  • the pump tip 40 is now arranged in the center of the dome and thus lies in the lamp axis.
  • the melting part 49 of the second power supply 48 is melted directly into the pump tip 40. With this manufacturing technique, care must be taken that the sealing section is sufficiently long, which is why the pump tip 40 must not be melted too short.
  • molybdenum or tungsten can be used as the material for the melting part 49 in order to adapt to the coefficient of thermal expansion.
  • an iron-nickel wire which may be coated with copper (F-wire). The longitudinal axis of the discharge vessel is again slightly shifted against the longitudinal axis of the outer bulb.
  • any optical interference caused by the pump tip is avoided.
  • this arrangement has a particularly favorable effect on the vibration behavior, since a mass concentration - as it represents a pinch seal - is avoided at a great distance from the "pivot point".
  • Another advantage is that with this arrangement the appearance of the discharge lamp comes very close to the appearance of a conventional automotive halogen lamp.
  • any anti-dazzle device is arranged separately in the headlight (e.g. in the form of an aperture).
  • the outer bulb is provided on a part of its circumference with a shading layer, which acts with respect to a headlight as a dimming means for producing dipped beam. In order to avoid any shadowing from the second power supply, this layer is applied in particular where the second power supply is returned along the outer bulb.

Landscapes

  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
EP88121024A 1987-12-22 1988-12-15 Lampe à décharge à haute pression Expired - Lifetime EP0321867B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3743627 1987-12-22
DE19873743627 DE3743627A1 (de) 1987-12-22 1987-12-22 Hochdruckentladungslampe

Publications (3)

Publication Number Publication Date
EP0321867A2 true EP0321867A2 (fr) 1989-06-28
EP0321867A3 EP0321867A3 (fr) 1991-01-02
EP0321867B1 EP0321867B1 (fr) 1994-03-30

Family

ID=6343313

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88121024A Expired - Lifetime EP0321867B1 (fr) 1987-12-22 1988-12-15 Lampe à décharge à haute pression

Country Status (2)

Country Link
EP (1) EP0321867B1 (fr)
DE (2) DE3743627A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0570068A1 (fr) * 1992-05-11 1993-11-18 Koninklijke Philips Electronics N.V. Lampe à décharge à haute pression munie d'un culot
EP0571964A1 (fr) * 1992-05-25 1993-12-01 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Lampe à décharge à haute pression à culot d'un côté
EP1139375A1 (fr) * 2000-03-30 2001-10-04 Heraeus Noblelight GmbH Emetteur de rayonnement

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2245417B (en) * 1990-04-20 1994-06-08 Koito Mfg Co Ltd Discharge lamp device
US5220235A (en) * 1990-04-20 1993-06-15 Koito Manufacturing Co., Ltd. Discharge lamp device
JP2761155B2 (ja) * 1992-07-08 1998-06-04 株式会社小糸製作所 自動車用灯具の光源用放電ランプ装置
JPH08162007A (ja) * 1994-12-06 1996-06-21 Koito Mfg Co Ltd 放電ランプ装置
DE102005007659A1 (de) * 2005-02-19 2006-08-24 Hella Kgaa Hueck & Co. Brenner für eine Gasentladungslampe und Verfahren zur Herstellung des Brenners

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3110833A (en) * 1961-02-21 1963-11-12 Westinghouse Electric Corp Multiple envelope high pressure mercury vapor discharge lamp
US3662203A (en) * 1969-05-20 1972-05-09 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh High pressure saturated metal vapor, preferably sodium or metal halide vapor discharge lamp
NL7011321A (fr) * 1970-07-31 1972-02-02
US4254355A (en) * 1978-09-11 1981-03-03 General Electric Company Ceramic arc tube mounting
DE3412489A1 (de) * 1984-04-03 1985-10-03 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH, 8000 München Einseitig gesockelte hochdruckentladungslampe

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0570068A1 (fr) * 1992-05-11 1993-11-18 Koninklijke Philips Electronics N.V. Lampe à décharge à haute pression munie d'un culot
US5736811A (en) * 1992-05-11 1998-04-07 U.S. Philips Corporation Capped high-pressure discharge lamp
CN1053524C (zh) * 1992-05-11 2000-06-14 皇家菲利浦电子有限公司 带帽高压放电灯
EP0571964A1 (fr) * 1992-05-25 1993-12-01 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Lampe à décharge à haute pression à culot d'un côté
EP1139375A1 (fr) * 2000-03-30 2001-10-04 Heraeus Noblelight GmbH Emetteur de rayonnement
US6570307B2 (en) 2000-03-30 2003-05-27 Heraeus Noblelight Gmbh Optical radiator with anti-extraction lock

Also Published As

Publication number Publication date
DE3743627A1 (de) 1989-07-06
EP0321867A3 (fr) 1991-01-02
DE3888808D1 (de) 1994-05-05
EP0321867B1 (fr) 1994-03-30

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