EP0742408A1 - Kfz-Scheinwerfer mit Abschirmungsmitteln gegen Streulicht sowie Lampe mit solchen Abschirmungsmitteln - Google Patents

Kfz-Scheinwerfer mit Abschirmungsmitteln gegen Streulicht sowie Lampe mit solchen Abschirmungsmitteln Download PDF

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Publication number
EP0742408A1
EP0742408A1 EP19960401019 EP96401019A EP0742408A1 EP 0742408 A1 EP0742408 A1 EP 0742408A1 EP 19960401019 EP19960401019 EP 19960401019 EP 96401019 A EP96401019 A EP 96401019A EP 0742408 A1 EP0742408 A1 EP 0742408A1
Authority
EP
European Patent Office
Prior art keywords
lamp
source
bulb
mirror
light
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
EP19960401019
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English (en)
French (fr)
Other versions
EP0742408B1 (de
Inventor
Benoît Reiss
Vincent Raillard
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.)
Valeo Vision SAS
Original Assignee
Valeo Vision SAS
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 Valeo Vision SAS filed Critical Valeo Vision SAS
Publication of EP0742408A1 publication Critical patent/EP0742408A1/de
Application granted granted Critical
Publication of EP0742408B1 publication Critical patent/EP0742408B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/40—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by screens, non-reflecting members, light-shielding members or fixed shades
    • F21S41/43—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by screens, non-reflecting members, light-shielding members or fixed shades characterised by the shape thereof
    • F21S41/435—Hoods or cap-shaped
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/17—Discharge light sources

Definitions

  • the present invention relates generally to motor vehicle headlamps equipped in particular with discharge lamps.
  • a headlamp is equipped with a filament lamp powered by the DC voltage supplied by the vehicle battery.
  • Discharge lamps have been developed recently for the use of motor vehicle headlamps, which require specific ignition and supply circuits, but which have the advantage, at the same power, of generating a much higher luminous flux. to that generated by an incandescent filament.
  • One of these techniques consists in associating with the source a cup masking a part of the mirror, but then a significant quantity of the luminous flux is lost (case in particular of a standard lamp "H4").
  • Another technique consists in resorting to a mirror of specific design, capable of generating by itself a beam with a clear cut.
  • This cover is designed simply as a function of the source, without taking into account any parasitic sources produced by the reflection of the radiation from the main source on adjacent parts of the lamp.
  • These adjacent parts can in particular be the salts of a discharge lamp, or of its electrodes, or even, and more inconveniently, the ceramic sleeve surrounding a lamp supply conductor situated outside the bulb, generally below it.
  • a major drawback of these parasitic sources lies in that, in cooperation with the mirror, they will most often generate light in significant quantity above the desired cut-off. This problem also arises in "HIR" type lamps.
  • the present invention aims to solve this drawback in the context of a lamp capable of presenting parasitic sources and comprising by itself means for obscuring part of the radiation coming from the source in the direction of determined areas of the mirror, these means being able to in particular include two opaque zones in the form of bands provided on the bulb and intended to promote obtaining a clean cut.
  • the present invention more specifically aims to propose a new masking or concealment device which reduces a substantial part of the dazzling due to the aforementioned parasitic sources, while causing a minimal reduction in the effective light flux, effectively participating in the formation of the light beam. .
  • the present invention proposes, according to a first aspect, a motor vehicle headlight as defined in claim 1.
  • the invention provides a lamp for a motor vehicle headlight as defined in claim 7.
  • FIG. 1 shows a motor vehicle headlight comprising a gas discharge lamp 10 mounted in a mirror 20.
  • the lamp comprises, in a bulb or glass envelope 12 of generally cylindrical shape, coaxial with the optical axis xx of the mirror, two electrodes 14a, 14b between which can be started and maintained, by appropriate electrical control, a luminous electric arc constituting the light source S of the projector.
  • the front electrode 14b is connected to the base 15 of the lamp by a conductor 16 comprising a descending branch 16a and a generally horizontal branch 16b, extending below the bulb and parallel to the axis x-x, up to the base.
  • This horizontal branch of the conductor 16 is surrounded by a ceramic sleeve 17, in a conventional manner.
  • the lamp 10 also includes a direct light cover 18 connected to the base 15 of the lamp by an appropriate support (not shown) which is treated so as to minimize parasitic reflections thereon.
  • the bulb 12 of the lamp conventionally in itself, comprises two opaque zones 12a, 12b intended to obscure the radiation coming from the source S and which would go towards two specific zones of the mirror.
  • These opaque zones are here in the form of bands extending parallel to the axis of the lamp, and are preferably produced by applying an opaque paint to the bulb.
  • one of these zones Z1 covers, to the left of the lamp in front view, a sector comprised between a horizontal half-plane P1 and a half-plane P2 inclined at 25 ° below the horizontal .
  • the other of these zones Z2 covers, to the right of the lamp in front view, a sector comprised between a half-plane P3 inclined at 15 ° below the horizontal and a half-plane P4 inclined at 40 ° below the horizontal .
  • This particular embodiment is of course not to be considered as limiting.
  • the mirror 20 is in this case a mirror capable of producing by itself, without the intervention of a cup, a European standard passing beam, by a specific design as described in a certain number of patents prior to the name of the Applicant.
  • the masking carried out by the strips 12a, 12b is intended to perfect the light beam produced by the mirror, by attenuating the light in certain areas of the beam and in particular the light susceptible, by imperfections of the reflecting surface, to overflow above the cut.
  • FIG. 2 also shows the conductor 16b provided with its sleeve 17.
  • the reflection of the light coming from the source S on this sleeve means that the latter constitutes a parasitic light source S ', mainly lighting upwards and towards the sides.
  • This parasitic source in cooperation with the mirror, is capable - by its position below the source S - of giving rise in the beam generated to a non-negligible amount of light above the desired cut-off.
  • Such a lamp can also give rise to other types of parasitic sources, and in particular to a source S '' linked to the presence of salts inside the envelope 12 or the electrodes 14a, 14b.
  • FIG. 3 there is shown a lamp according to the invention, with which two occulters are associated which are intended to intercept a substantial part of the radiation coming from the parasitic source and which would go towards the mirror, and which have the characteristic of being placed in the two shadow zones Z1 and Z2 caused by the opaque bands 12a, 12b.
  • these occulters have no influence on the light emitted by the source S, and therefore on the beam generated by the mirror from said source.
  • by obscuring most of the radiation scattered by the parasitic source and likely to meet the mirror they prevent this radiation from generating in the beam of light above the cut.
  • the occulters are in this case in the form of flat plates 13a, 13b, for example metallic, which extend substantially radially from the bulb 12 over an extent at least equal to, and preferably greater than, that of the parasitic source S '.
  • these plates do not extend strictly radially, but are inclined, from the inside towards the outside, from the upper limit plane of the zone considered towards their lower limit plane.
  • the blinds 13a and 13b can be fixed in place by being made integral with the direct light cover 18 (for example welded or crimped), by presenting recesses 131a, 131b extending said blinds forward on a certain distance on either side of the cache.
  • the underside of the concealment plates 13a, 13b has a light-absorbing coating (matt black paint or the like).
  • the occulters 13a, 13b can be fixed directly to the base 15 of the lamp.
  • the occulters 13a, 13b themselves which constitute means for mounting the direct light cover 18 on the base or on the mirror, in which case the occulters are secured to the base or the mirror at their rear end and secured to the cover 18 at their front end.
  • the invention generally applies to any type of lamp comprising, outside the bulb, one or more organs, in particular electrodes, capable of constituting parasitic sources, and covers in particular the so-called “HIR” lamps (Halogen Infra Red, in which the balloon of the lamp retro-reflects the infrared radiation emitted by the filament towards this same filament to increase the light excitation.
  • HIR Hexogen Infra Red
  • This projector comprises a screening part which comprises a part forming a direct light cover 18 with a curved upper wall 181, two vertical side walls 182, 183, a horizontal lower wall 186 and a front wall 187.
  • Two bevelled parts 184, 185 ensure the transition between the side walls and the bottom wall.
  • edges of the upper, lower and lateral walls opposite the front wall have a geometry such that the radiation coming from the lamp only reaches the useful parts of the mirror 20.
  • the occluders 13a, 13b whose function is identical to that of the occluders described with reference to FIGS. 3 and 4, at the same time constitute the means for fixing the part 18 forming a mask of direct light on the mirror 20 , so that no additional fixing part such as bracket, upright, etc., likely to reduce the light output and / or generate parasitic radiation, is necessary.
  • These extensions are capable of locking, after elastic deformation for their establishment, in two openings 21a, 21b formed in the mirror 20 on either side of the lamp hole.
  • the placing of the lamp in the lamp hole can be used either to ensure the mounting of the concealment piece on the mirror, or to confirm the mounting carried out for example as described above, by coming in this case to exert a support radially outwards at the level of the extensions 132a, 132b and perform an appropriate axial setting, to avoid any risk of unlocking.
  • Figure 8 shows the angular arrangement of the occluders 13a, 13b so that they are well located in the shadow areas created by the opaque areas 12a, 12b of the bulb.
  • the parts 13a and 13b of the concealment piece can alternatively be oriented not vertically but with an oblique inclination, as in the case of FIGS. 3 and 4.
EP19960401019 1995-05-10 1996-05-10 Kfz-Scheinwerfer mit Abschirmungsmitteln gegen Streulicht sowie Lampe mit solchen Abschirmungsmitteln Expired - Lifetime EP0742408B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9505514 1995-05-10
FR9505514A FR2734043B1 (fr) 1995-05-10 1995-05-10 Projecteur de vehicule automobile comportant des moyens d'occultation de lumiere parasite, et lampe pourvue de tels moyens d'occultation

Publications (2)

Publication Number Publication Date
EP0742408A1 true EP0742408A1 (de) 1996-11-13
EP0742408B1 EP0742408B1 (de) 2003-06-25

Family

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Application Number Title Priority Date Filing Date
EP19960401019 Expired - Lifetime EP0742408B1 (de) 1995-05-10 1996-05-10 Kfz-Scheinwerfer mit Abschirmungsmitteln gegen Streulicht sowie Lampe mit solchen Abschirmungsmitteln

Country Status (4)

Country Link
EP (1) EP0742408B1 (de)
DE (1) DE69628787T2 (de)
ES (1) ES2201159T3 (de)
FR (1) FR2734043B1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2308647A (en) * 1995-12-22 1997-07-02 Koito Mfg Co Ltd A vehicular headlamp
CN101871615A (zh) * 2009-03-24 2010-10-27 海拉汽车部件奥地利有限公司 前照灯
DE19947876B4 (de) * 1999-10-05 2012-06-28 Automotive Lighting Reutlingen Gmbh Scheinwerfer für Fahrzeuge

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4271459A (en) * 1979-01-17 1981-06-02 Lucas Industries Limited Vehicle headlamp assembly
EP0231935A2 (de) * 1986-02-06 1987-08-12 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Kraftfahrzeugscheinwerferlampe
DE4302907A1 (de) * 1992-02-05 1993-08-12 Koito Mfg Co Ltd

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4271459A (en) * 1979-01-17 1981-06-02 Lucas Industries Limited Vehicle headlamp assembly
EP0231935A2 (de) * 1986-02-06 1987-08-12 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Kraftfahrzeugscheinwerferlampe
DE4302907A1 (de) * 1992-02-05 1993-08-12 Koito Mfg Co Ltd

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2308647A (en) * 1995-12-22 1997-07-02 Koito Mfg Co Ltd A vehicular headlamp
GB2308647B (en) * 1995-12-22 1999-02-17 Koito Mfg Co Ltd Vehicular headlamp
US6132068A (en) * 1995-12-22 2000-10-17 Koito Manufacturing Co., Ltd. Vehicular headlamp having a shade
DE19947876B4 (de) * 1999-10-05 2012-06-28 Automotive Lighting Reutlingen Gmbh Scheinwerfer für Fahrzeuge
CN101871615A (zh) * 2009-03-24 2010-10-27 海拉汽车部件奥地利有限公司 前照灯
CN101871615B (zh) * 2009-03-24 2014-10-15 海拉汽车部件奥地利有限公司 前照灯

Also Published As

Publication number Publication date
FR2734043A1 (fr) 1996-11-15
ES2201159T3 (es) 2004-03-16
DE69628787D1 (de) 2003-07-31
EP0742408B1 (de) 2003-06-25
DE69628787T2 (de) 2004-05-19
FR2734043B1 (fr) 1997-08-01

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