EP1126211B1 - Projecteur de type elliptique pour véhicule automobile - Google Patents

Projecteur de type elliptique pour véhicule automobile Download PDF

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Publication number
EP1126211B1
EP1126211B1 EP20010102762 EP01102762A EP1126211B1 EP 1126211 B1 EP1126211 B1 EP 1126211B1 EP 20010102762 EP20010102762 EP 20010102762 EP 01102762 A EP01102762 A EP 01102762A EP 1126211 B1 EP1126211 B1 EP 1126211B1
Authority
EP
European Patent Office
Prior art keywords
reflector
light
light source
headlamp
optical axis
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.)
Expired - Lifetime
Application number
EP20010102762
Other languages
German (de)
English (en)
Other versions
EP1126211A2 (fr
EP1126211A3 (fr
Inventor
Michael Werner
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.)
Volkswagen AG
Original Assignee
Volkswagen AG
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 Volkswagen AG filed Critical Volkswagen AG
Publication of EP1126211A2 publication Critical patent/EP1126211A2/fr
Publication of EP1126211A3 publication Critical patent/EP1126211A3/fr
Application granted granted Critical
Publication of EP1126211B1 publication Critical patent/EP1126211B1/fr
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
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/32—Optical layout thereof
    • F21S41/321—Optical layout thereof the reflector being a surface of revolution or a planar surface, e.g. truncated
    • 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
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/32—Optical layout thereof
    • F21S41/36—Combinations of two or more separate reflectors
    • F21S41/365—Combinations of two or more separate reflectors successively reflecting the light
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2102/00—Exterior vehicle lighting devices for illuminating purposes
    • F21W2102/20—Illuminance distribution within the emitted light

Definitions

  • the invention relates to a projection headlight for motor vehicles with a light source, a main reflector and a lens, wherein an optical axis of the projection headlamp is defined by the main reflector.
  • a dipped-beam headlamp which comprises a parabolic reflector having an optical axis and a focal point, a light source arranged on the optical axis and slightly in front of the focal point and a limiting device, wherein the limiting device part of the leaked from the light source and is able to intercept light rays traveling towards the reflector in order to produce a cutting boundary at the light beam reflected by the reflector.
  • the reflector is composed of two paraboloid portions of the same focal point extending to the left and right of the optical axis, and the paraboloidal portion, which is located on the side from the front when the reflector is viewed, that of the roadside to be properly traveled corresponds, has a larger focal length than the other paraboloid section.
  • a vehicle lamp with a projector beam headlamp comprises a light source, a lens and a reflector, which is adapted to reflect light forward through the lens for generating a beam.
  • the headlamp further includes a shield disposed in the light path between the reflector and the lens and having a non-uniform working edge.
  • Object of the present invention is to improve the radiation characteristics of the known projection headlights for motor vehicles and at the same time to make their appearance complacent.
  • a second reflector is arranged according to the invention in the luminaire housing relative to the first reflector.
  • the second reflector acts as a "back reflector", which reflects back a part of the light emitted by the light source to the first "main reflector".
  • the light cone is limited by the light source at its edge. Due to the first reflection of the light at the cone edge through the back reflector onto the main reflector and the subsequent second reflection of the light through the main reflector, the light cone of the light source is widened to the side.
  • the emission characteristic is no longer so "glaring”, and the appearance of the projection headlamp according to the invention is “softer” compared to headlamps according to the prior art.
  • the projection headlamp for a motor vehicle with a light source, a main reflector and a lens wherein the optical reflector is defined by the main reflector, characterized by a rear reflector, which is arranged between the light source and the lens of the headlamp and one to the optical axis of the main reflector has substantially centrally symmetrical light passage opening.
  • the back reflector may be inclined relative to the optical axis of the main reflector, in order to be able to be adapted to different requirements with respect to shaping of the light beam in the left and right headlights.
  • the light passage opening of the rear reflector may have a circular, an elliptical or a substantially square shape.
  • the special shape of the light passage opening (elliptical or square or rectangular) can be chosen in particular depending on the shape of the main reflector, so that the main light cone of the headlamp corresponds to the design of the lens.
  • an optical element for shaping the main light beam may be provided in the light passage opening of the rear reflector.
  • the shape of the reflector surface of the rear reflector can - viewed from the light source - be convex or concave. In this way, the light coming from the light source can be reflected by the back reflector in an annular bundle to the main reflector (concave) or further scattered (convex). In the first case, this results in a gradation in the intensity distribution of the headlight, in the second case results in an approximately continuous, uniform decrease in the light intensity from the optical axis to the outside in the cone of light.
  • Fig. 1 shows a headlamp with an embodiment of the rear reflector according to the invention in cross section.
  • Fig. 2 shows an embodiment of the rear reflector according to the invention in plan view.
  • the projection headlight for a motor vehicle shown in Fig. 1 comprises a light source 1, which is positioned in a main reflector 2.
  • the main reflector 2 is preferably parabolic, and the light source 1 is arranged in a focal point of the main reflector parabola.
  • the headlight is closed by a lens 3 forward, so that the light source 1 and other, not considered here elements of the headlamp are protected from (mechanical) external influences.
  • an optical axis 5 of the headlamp is defined, on which the light source 1 is arranged.
  • the shape of the light cone of the headlamp is essentially determined by the shape of the main reflector 2.
  • the light source 1 and a central portion 4 of the main reflector form a lamp module that can be installed as a unit in the headlight.
  • the luminaire module often comprises as further elements lenses or other optical elements in front of the light source 1 for beam shaping of the light cone.
  • Such an optical element is designated by 9 in FIG.
  • the installation of the complete lighting module in the headlight has the particular advantage that complex adjustment work in the arrangement of the light source 1 in the main reflector 2 accounts.
  • the luminaire module only becomes solid in the vehicle built-in outer portion 10 of the main reflector 2 used.
  • the orientation of the luminaire module with respect to this outer portion 10 is not as critical as the orientation of the light source 1 with respect to achsengue portions of the strahiformenden main reflector.
  • a back reflector 6 is arranged between the light source 1 and the lens 3 of the headlamp according to the invention.
  • This back reflector 6 has a substantially centrally symmetrical to the optical axis 5 of the main reflector 2 light passage opening 8, so that an axis near portion of the light from the light source 1 unhindered by the back reflector from the headlight exits. Only the portion of the light emitted at an angle from the light source that is greater than a predetermined reference angle is reflected by the back reflector 6.
  • Fig. 1 To illustrate the effect of the back reflector 6 according to the invention two beams 11 and 12 are shown in Fig. 1, wherein the beam 12 has been chosen so that it is influenced by the back reflector 6, while as another beam 11, an unaffected remaining beam was selected.
  • the rear reflector 6 according to the invention is preferably fastened to the luminaire module at the level of the (optional) optical element 9 via retaining elements 7.
  • the unaffected beam 11 emerges from the light source 1, reaches the light passage opening 8 of the rear reflector and the optical element 9 therein, which serves for beam shaping. He is there (as in the prior art) deflected by the optical element 9 in a desired direction.
  • the angle between the beam 11 and the optical axis 5 nowhere exceeds a predetermined value.
  • the beam 12 leaves the light source 1 at an angle which is greater than the predetermined value: the beam 12, in contrast to beam 11, is not an off-axis beam.
  • the beam 12 therefore strikes the rear reflector 6 according to the invention, from which it is "thrown back", ie by which it is prevented from directly emerging through the lens 3 from the headlight.
  • the beam 12 After the beam 12 has been reflected by the rear reflector 6, it reaches laterally offset the outer portion 10 of the main reflector 2. There, its direction is changed a second time, so that it now leaves the headlight past the rear reflector through the lens 3.
  • Fig. 2 shows a very simple form of the back reflector 6 with light passage opening 8 in plan view, i. seen in the direction of the optical axis. In the illustrated embodiment of the back reflector 6, this and the light passage opening contained therein is circular. This results in a solid angle as a value which is proportional to the square of the ratio of radius of the light passage opening 8 and distance between the light source 1 and the rear reflector 6.
  • the choice of the shape of the light passage opening 8 of the back reflector 6 depends substantially on the requirements in terms of the design of the headlamp. Therefore, the light passage opening 8 will generally have an elliptical, rectangular or square shape and thus give a different solid angle.
  • the back reflector 6 may be inclined relative to the optical axis 5 of the main reflector 2, so that it is "parallel" to the course of the lens 3.
  • the rear reflector in the right headlight of the vehicle for example, with respect to the vehicle from outside to inside obliquely forward.
  • the position of the rear reflector 6 is of course decisive for the above-mentioned effective area of the light passage opening 8 and thus for the effective solid angle of the rear reflector. 6
  • the back reflector 6 has a convex reflector surface, when viewed from the light source 1, the back reflector 6. This results in the beam path described above with reference to the beam 12.
  • the back reflector 6, however, on a concave reflector surface.
  • the two different shapes of the reflector surface cause different patterns in the beam cone of the headlamp with the back reflector 6.
  • the convex reflector surface the light coming from the light source is further dissipated by the back reflector 6, it is bundled annularly at the concave reflector surface.
  • the convex back reflector 6 an approximately continuous, uniform decrease in the light intensity from the optical axis to the outside in the light cone is thus obtained.
  • the concave reflector surface leads to a gradation in the intensity distribution of the headlamp, resulting in a ring-shaped graduated intensity distribution in the beam cone.
  • the radiation characteristic the headlight is no longer so “glaringly” and the appearance of the projection headlight according to the invention "softer” compared to headlamps according to the prior art.

Claims (5)

  1. Projecteur de type elliptique pour un véhicule automobile comprenant une source de lumière (1), un réflecteur principal (2) et un disque lumineux (3), un axe optique (5) étant défini par le réflecteur principal (2), ainsi qu'un rétroréflecteur (6) qui est disposé entre la source de lumière (1) et le disque lumineux (3) du projecteur et un orifice de passage de lumière (8) essentiellement symétrique par rapport au centre de l'axe optique (5) du réflecteur principal (2), caractérisé en ce qu'un élément optique (9) destiné à mette en forme le rayon lumineux principal est prévu dans l'orifice de passage de lumière (8) du rétroréflecteur (6).
  2. Projecteur selon la revendication 1, caractérisé en ce que le rétroréflecteur (6) est disposé en biais par rapport à l'axe optique (5) du réflecteur principal (2).
  3. Projecteur selon la revendication 1 ou 2, caractérisé en ce que l'orifice de passage de lumière (8) du rétroréflecteur (6) est pour l'essentiel carré.
  4. Projecteur selon l'une des revendications 1 à 3, caractérisé en ce que le rétroréflecteur (6) présente une surface de réflexion convexe.
  5. Projecteur selon l'une des revendications 1 à 3, caractérisé en ce que le rétroréflecteur (6) présente une surface de réflexion concave.
EP20010102762 2000-02-18 2001-02-08 Projecteur de type elliptique pour véhicule automobile Expired - Lifetime EP1126211B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10007403 2000-02-18
DE2000107403 DE10007403A1 (de) 2000-02-18 2000-02-18 Projektionsscheinwerfer für ein Kraftfahrzeug

Publications (3)

Publication Number Publication Date
EP1126211A2 EP1126211A2 (fr) 2001-08-22
EP1126211A3 EP1126211A3 (fr) 2004-01-14
EP1126211B1 true EP1126211B1 (fr) 2006-03-29

Family

ID=7631409

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20010102762 Expired - Lifetime EP1126211B1 (fr) 2000-02-18 2001-02-08 Projecteur de type elliptique pour véhicule automobile

Country Status (3)

Country Link
EP (1) EP1126211B1 (fr)
AT (1) ATE321974T1 (fr)
DE (2) DE10007403A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1818527B (zh) * 2005-02-07 2010-05-26 西门子公司 热屏

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10337060A1 (de) * 2003-08-12 2005-03-10 Volkswagen Ag Abblendscheinwerfer mit ringförmigem Erscheinungsbild
DE102008015039A1 (de) * 2008-03-14 2009-09-24 OBE OHNMACHT & BAUMGäRTNER GMBH & CO. KG Vorrichtung und Verfahren zur diffusen Ausleuchtung eines linienförmigen Bereichs
DE102011108383A1 (de) * 2011-07-22 2013-01-24 Udo Beewen Vorrichtung zum Ausleuchten einer Straße
DE102016203403A1 (de) 2016-03-02 2017-09-07 Volkswagen Aktiengesellschaft Verfahren zum Betreiben einer Kraftfahrzeug-Beleuchtungseinrichtung

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1883360A (en) * 1929-01-29 1932-10-18 American Safety Headlight Corp Headlight
US3796886A (en) * 1973-05-18 1974-03-12 Ervin J Radiant energy reflectors
US4037096A (en) * 1974-08-09 1977-07-19 American Sterilizer Company Illuminator apparatus using optical reflective methods
FR2509427A1 (fr) * 1981-07-10 1983-01-14 Cibie Projecteurs Projecteur de croisement a reflecteur asymetrique
FR2591968B1 (fr) * 1985-12-24 1988-04-01 Cibie Projecteurs Feu de signalisation a eclairement colore pour vehicule automobile
DE4224865A1 (de) * 1992-07-28 1994-02-03 Bayerische Motoren Werke Ag Kraftfahrzeug-Scheinwerfer
DE29519938U1 (de) * 1995-12-15 1996-02-15 Zizala Lichtsysteme Gmbh Doppelreflektorscheinwerfer
GB9608260D0 (en) * 1996-04-20 1996-06-26 Rover Group A lamp for a motor vehicle

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1818527B (zh) * 2005-02-07 2010-05-26 西门子公司 热屏

Also Published As

Publication number Publication date
EP1126211A2 (fr) 2001-08-22
EP1126211A3 (fr) 2004-01-14
ATE321974T1 (de) 2006-04-15
DE50109342D1 (de) 2006-05-18
DE10007403A1 (de) 2001-08-23

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