EP0628765A1 - Fahrzeugscheinwerfer mit einem ellipsoid-ähnlichen Reflektor - Google Patents

Fahrzeugscheinwerfer mit einem ellipsoid-ähnlichen Reflektor Download PDF

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Publication number
EP0628765A1
EP0628765A1 EP94400828A EP94400828A EP0628765A1 EP 0628765 A1 EP0628765 A1 EP 0628765A1 EP 94400828 A EP94400828 A EP 94400828A EP 94400828 A EP94400828 A EP 94400828A EP 0628765 A1 EP0628765 A1 EP 0628765A1
Authority
EP
European Patent Office
Prior art keywords
mirror
horizontal
lens
convergence
focal plane
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
EP94400828A
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English (en)
French (fr)
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EP0628765B1 (de
Inventor
Laurent Mottet
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
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Valeo Vision SAS
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Publication date
Application filed by Valeo Vision SAS filed Critical Valeo Vision SAS
Publication of EP0628765A1 publication Critical patent/EP0628765A1/de
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Publication of EP0628765B1 publication Critical patent/EP0628765B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • F21S41/33—Multi-surface reflectors, e.g. reflectors with facets or reflectors with portions of different curvature
    • F21S41/337—Multi-surface reflectors, e.g. reflectors with facets or reflectors with portions of different curvature the reflector having a structured surface, e.g. with facets or corrugations
    • 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
    • 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
    • F21S41/33—Multi-surface reflectors, e.g. reflectors with facets or reflectors with portions of different curvature
    • F21S41/334—Multi-surface reflectors, e.g. reflectors with facets or reflectors with portions of different curvature the reflector consisting of patch like sectors

Definitions

  • the present invention relates generally to headlamps of the elliptical type for motor vehicles.
  • elliptical projector is meant a projector comprising a light source, a mirror capable of concentrating the light coming from the source towards a region of concentration situated in front of the source, a lens placed in front of the mirror so that its focal plane is neighbor of the concentration region, and a closing window.
  • a mask is also provided in the focal plane of the lens, one edge of which defines said cut.
  • the mirror is purely ellipsoidal, with the source disposed on its first focal point, in which case there is a concentration of the radiation in an essentially circular pattern around the second focal point, through which the focal plane of the lens passes.
  • document FR-A-2,516,203 describes a projector of the type indicated above, in which areas are provided on the mirror which are not reflective, specifically positioned so as to reduce the proportion of vertical images of the filament in the beam formed. There is thus obtained at the focal plane of the lens a flatter light spot, facilitating the correction work to be carried out by the glass. However, the light output of the projector is further reduced, and the width of the beam before the lens remains limited.
  • Document FR-A-2 554 546 also discloses a projector of the same type, in which the mirror is a kind of flattened ellipsoid, resting vertically on an ellipse with an interior focus on the source and with a focus exterior is in the vicinity of the focal plane of the lens, and resting horizontally on a different ellipse, the interior focus of which is also on the source but the exterior focus of which is located in front of the abovementioned focal plane.
  • document EP-A-0 153 485 discloses a projector in which an attempt has also been made to produce a large light spot at the second focal point of a mirror of the elliptical type. But here again, the mirror is designed discreetly, strip by strip, with consequently the same drawbacks.
  • the invention aims to overcome these drawbacks of the prior art, and to provide a motor vehicle headlight of the elliptical type in which a wide beam can be obtained with a mirror of generally smooth shape and without breaking the slope. To this end, it proposes a projector as defined in claim 1.
  • a projector which comprises a light source 10 of small dimensions, such as the filament of an incandescent lamp or the arc of a discharge lamp, a mirror 20 for recovering and concentrating the light flux emitted by the source, a mask 30 placed in a well-determined position in front of the mirror 20 and intended to form, by occultation of part of the incident radiation, a luminous image of shape and determined light distribution suitable for a passing beam, a converging lens 40, for example a plano-convex lens, the focal plane of which is situated at the level of the mask 30, and finally a closing glass 50 preferably smooth or slightly deflecting.
  • a light source 10 of small dimensions such as the filament of an incandescent lamp or the arc of a discharge lamp
  • a mirror 20 for recovering and concentrating the light flux emitted by the source
  • a mask 30 placed in a well-determined position in front of the mirror 20 and intended to form, by occultation of part of the incident radiation, a luminous image of shape and determined
  • the mirror 20 is of the ellipsoidal genus with two focal points situated on its axis
  • the source 10 is placed in the vicinity of the first focal point while the mask 30 is placed in the vicinity of the second focal point, where the reflected light converges by the mirror.
  • the mirror comprises at least one zone such that the point of convergence of the radiation, in projection in a horizontal plane, that is to say the point which corresponds to the second focus of an ellipsoid, varies as that we move laterally from the optical axis of the mirror.
  • FIG. 1 shows that the mirror 20 has a central zone or bottom zone 21 which is optically characterized by a first focal point FR, on which the source 10 is placed, and by a second focal point FS, fixed, towards which the whole of the radiation reflected by this zone 21 converges.
  • This focal point FS is located in the plane of the mask 30 and preferably in the vicinity of an edge 31 of said mask itself intended to define a cut-off of the generated beam.
  • this zone 21 has a similar behavior, with the same foci FR and FS.
  • This zone 21 can therefore be constituted by a portion of ellipsoid of revolution of FR and FS homes.
  • This zone 21 is to create a relatively concentrated central spot at the focal plane of the lens 40.
  • the mirror 20 also comprises two lateral zones 22a and 22b produced according to the present invention.
  • the zone 22a extends laterally up to a limit denoted y max . At this level, the current horizontal focus Fc reaches an extreme forward position on the axis Ox, denoted FT.
  • the relation between the dimension yc, varying between y min and y max , and the current horizontal focus Fc can be any monotonic relation, for example a linear relation. Non-linear relationships are of course conceivable.
  • the zone 22a behaves differently, that is to say that, whatever the dimension in y of a vertical section of the mirror, the convergence in the vertical plane preferably occurs on the line D parallel to y'y and passing through the focal point FS or in the vicinity of this line. This behavior is illustrated in Figure 2.
  • the opposite lateral zone 22b behaves symmetrically in this case from the zone 22a with respect to the optical axis 0x, and this behavior will not be repeated here.
  • the lateral zones 22a and 22b of the mirror cooperate to generate in the focal plane of the lens 40 a light spot which is vertically little thick, insofar as the vertical convergence always takes place in the vicinity of the line D mentioned above.
  • this thickness depends only on the dimensions of the source 10.
  • the mirror 20 according to the invention therefore makes it possible to generate at the level of the mask 30 a light spot of which a part is a concentrated central spot, intended to give the projected beam its range, and of which another part is a wide and not very thick spot. , intended to give the beam its width. It is also observed that, insofar as the zones 22a, 22b do not appreciably increase the vertical height of the spot relative to the case of an ellipsoid of revolution, the light output is not degraded because it does not appreciably increase not the proportion of light obscured by the mask 30.
  • FIG. 3a a spot of general circular outline is observed, which follows from the shape of revolution of the mirror.
  • the spot has a marked central concentration and at the same time a large width, without being higher vertically than that of FIG. 3a.
  • FIG. 4 illustrates by a set of isolux curves Ci on a standardized projection screen the appearance of the beam obtained, without the intervention of the closing glass.
  • the beam is thin, which allows not to light the road too close to the vehicle.
  • FIGS. 5 and 5a an alternative embodiment of a projector according to the present invention has been shown, the mirror of which has a central zone 21 in the form of an ellipsoid of revolution and two lateral zones 22a and 22b produced as described above and, between said central zone and the lateral zones, intermediate zones forming striations, respectively 23a and 23b.
  • These intermediate zones are produced by local deformation with respect to the mirror of FIG. 1, so as to disperse significantly the points of horizontal convergence on Ox obtained for vertical section of the intermediate zones.
  • the vertical convergence of the mirror is the same as in the case of FIGS. 1 and 2, that is to say that the light converges vertically preferably in the vicinity of the focal plane of the lens for all the points of the mirror.
  • the intermediate zones 23a and 23b are preferably connected continuously, and if necessary differentiable, with the neighboring zones 21 and 22a, 22b respectively.
  • the streaks are configured so as to respect the maximum levels of illumination authorized by the regulations, in particular in the region to the left of the concentration spot below the horizontal half-cut hH.
  • FIG. 6 illustrates, by isocandela curves C'i on a standardized projection screen, the shape of the beam obtained with a projector equipped with the mirror of FIG. 5, without the intervention of the glass. It is observed that the thickness of the beam in the axis (below the point H) is appreciably reduced compared to the case of FIG. 4, because a certain proportion of large vertical images or slightly inclined with respect to the vertical were scattered laterally.
  • a mask 30 is generally not provided, so that with the headlamp in FIGS. 1 and 2, the configuration photometric obtained will correspond to the curves of figure 3b without occultation.
  • a mask In the case of a fog light, a mask is provided with a rectilinear horizontal edge.
  • zones 22a and 22b are provided which shift the point of horizontal convergence forwards relative to the focal plane of the lens 40 as one moves away laterally of the axis 0x, it can of course be provided for these points of convergence to approach the focal plane PF when one moves away from the optical axis. This approach is moreover preferred in the case of an anti-fog beam.
  • the above variant can be easily implemented by using for the function h (

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
EP94400828A 1993-04-15 1994-04-15 Fahrzeugscheinwerfer mit einem ellipsoid-ähnlichen Reflektor Expired - Lifetime EP0628765B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9304449A FR2704044B1 (fr) 1993-04-15 1993-04-15 Projecteur du genre elliptique pour vehicule automobile.
FR9304449 1993-04-15

Publications (2)

Publication Number Publication Date
EP0628765A1 true EP0628765A1 (de) 1994-12-14
EP0628765B1 EP0628765B1 (de) 1996-12-18

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Family Applications (1)

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EP94400828A Expired - Lifetime EP0628765B1 (de) 1993-04-15 1994-04-15 Fahrzeugscheinwerfer mit einem ellipsoid-ähnlichen Reflektor

Country Status (3)

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EP (1) EP0628765B1 (de)
DE (1) DE69401164T2 (de)
FR (1) FR2704044B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2843184A1 (fr) 2002-08-05 2004-02-06 Valeo Vision Projecteur d'eclairage elliptique convenant a la realisation d'un faisceau de virage
EP0923695B2 (de) † 1997-07-11 2013-07-17 Automotive Lighting Reutlingen GmbH Scheinwerferanlage für fahrzeuge für abblendlicht und fernlicht

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19602978B4 (de) * 1996-01-27 2007-04-26 Automotive Lighting Reutlingen Gmbh Fahrzeug-Scheinwerfer
JP3145930B2 (ja) * 1996-08-02 2001-03-12 株式会社小糸製作所 車輌用前照灯
FR2773604B1 (fr) * 1998-01-09 2000-03-31 Valeo Vision Projecteur du genre elliptique pour vehicule automobile
FR2777632B1 (fr) * 1998-04-20 2000-07-07 Valeo Vision Projecteur susceptible d'emettre des faisceaux pour trafic a gauche ou a droite, pour vehicule automobile
FR2789475B1 (fr) 1999-02-09 2001-04-27 Valeo Vision Projecteur du genre elliptique pour vehicule automobile, susceptible d'emettre un faisceau a coupure de photometrie amelioree
FR2789476B1 (fr) 1999-02-09 2001-04-27 Valeo Vision Projecteur du genre elliptique pour vehicule automobile, susceptible d'emettre un faisceau sans coupure
FR2789474B1 (fr) 1999-02-09 2001-04-27 Valeo Vision Projecteur du genre elliptique pour vehicule automobile, susceptible d'engendrer selectivement l'un parmi deux types de faisceaux
FR2793542B1 (fr) 1999-05-12 2001-08-17 Valeo Vision Projecteur du genre elliptique a deux fonctions d'eclairage pour vehicule automobile
FR2797029B1 (fr) 1999-07-30 2001-09-14 Valeo Vision Projecteur du genre elliptique pour vehicule automobile, susceptible d'engendrer un faisceau lumineux a deux fonctions
FR2797030B1 (fr) 1999-07-30 2001-09-14 Valeo Vision Projecteur du genre elliptique pour vehicule automobile, susceptible d'engendrer un faisceau lumineux a deux fonctions
FR2802282B1 (fr) 1999-12-09 2002-01-25 Valeo Vision Procede d'elaboration d'un masque pour adapter un faisceau de projecteur de croisement a un sens de circulation inverse
FR2809798B1 (fr) 2000-05-31 2002-11-29 Valeo Vision Procede pour adapter un faisceau de croisement de projecteur elliptique a un sens de circulation inverse, dispositif, gabarit et projecteur pour la mise en oeuvre de ce procede
FR2810934B1 (fr) 2000-07-03 2002-09-13 Valeo Vision Projecteur elliptique a modification de faisceau par mouvement d'elements optiques

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0153485A2 (de) * 1984-02-25 1985-09-04 Hella KG Hueck & Co. Abgeblendeter Fahrzeugscheinwerfer
EP0254746A1 (de) * 1985-12-27 1988-02-03 Ichikoh Industries Limited Scheinwerfer für fahrzeuge

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0153485A2 (de) * 1984-02-25 1985-09-04 Hella KG Hueck & Co. Abgeblendeter Fahrzeugscheinwerfer
EP0254746A1 (de) * 1985-12-27 1988-02-03 Ichikoh Industries Limited Scheinwerfer für fahrzeuge

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0923695B2 (de) † 1997-07-11 2013-07-17 Automotive Lighting Reutlingen GmbH Scheinwerferanlage für fahrzeuge für abblendlicht und fernlicht
FR2843184A1 (fr) 2002-08-05 2004-02-06 Valeo Vision Projecteur d'eclairage elliptique convenant a la realisation d'un faisceau de virage
EP1388463A1 (de) 2002-08-05 2004-02-11 Valeo Vision Kfz-Scheinwerfer nach dem Projektionsprinzip zur Erzeugung eines Kurvenlichtbündels

Also Published As

Publication number Publication date
FR2704044A1 (fr) 1994-10-21
FR2704044B1 (fr) 1995-07-13
DE69401164T2 (de) 1997-05-15
DE69401164D1 (de) 1997-01-30
EP0628765B1 (de) 1996-12-18

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