EP0890785B1 - Projecteur de véhicule - Google Patents

Projecteur de véhicule Download PDF

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Publication number
EP0890785B1
EP0890785B1 EP98112725A EP98112725A EP0890785B1 EP 0890785 B1 EP0890785 B1 EP 0890785B1 EP 98112725 A EP98112725 A EP 98112725A EP 98112725 A EP98112725 A EP 98112725A EP 0890785 B1 EP0890785 B1 EP 0890785B1
Authority
EP
European Patent Office
Prior art keywords
light
reflector
headlight
lens
profiles
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
EP98112725A
Other languages
German (de)
English (en)
Other versions
EP0890785A2 (fr
EP0890785A3 (fr
Inventor
Karl-Otto Dobler
Kurt Schuster
Juergen Dr. Wulf
Andreas Schien
Klaus Nagel
Doris Boebel
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.)
Marelli Automotive Lighting Reutlingen Germany GmbH
Original Assignee
Automotive Lighting Reutlingen GmbH
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
Priority claimed from DE19814478A external-priority patent/DE19814478A1/de
Application filed by Automotive Lighting Reutlingen GmbH filed Critical Automotive Lighting Reutlingen GmbH
Publication of EP0890785A2 publication Critical patent/EP0890785A2/fr
Publication of EP0890785A3 publication Critical patent/EP0890785A3/fr
Application granted granted Critical
Publication of EP0890785B1 publication Critical patent/EP0890785B1/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
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/28—Cover glass
    • 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
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/25—Projection lenses

Definitions

  • the invention relates to a headlamp for vehicles according to the preamble of claim 1.
  • a headlamp is known from US 1,393,573.
  • a projection type vehicle headlamp comprising a reflector, a light source and a lens.
  • an annular translucent element is arranged around the lens, into which light is coupled via an outer peripheral surface by means of separate light sources, which returns to the front in the light exit direction of the element by means of coupling optics arranged in the element via an end face of the element Headlamps is decoupled.
  • a headlight for vehicles which has a reflector, a light source and a lens through which light reflected by the reflector passes.
  • the headlamp on the lens surrounding at least a portion of its circumference translucent element through which light emitted by the light source, which is not detectable by the reflector, can pass through and is collected.
  • the element has for this purpose prisms, is deflected by the passing light.
  • the headlamp according to the invention with the features according to claim 1 has the advantage over the type that can be applied to the profiles in a simple manner, a coating without the entire surface of the light-transmissive element is covered by the coating.
  • the at least partially reflecting layer it is achieved that the headlamp has a brilliant appearance when switched off, although sufficient illumination of the area around the lens is achieved by the light-collecting effect of the Fresnel lens despite the partial shielding of the light having passed through the element becomes.
  • the development according to claim 7, the distribution of the light passing through the element can be influenced.
  • a headlight for vehicles, in particular motor vehicles, illustrated in FIGS. 1 to 9 is preferably constructed according to the projection principle and serves to generate at least the low beam.
  • the headlight has a reflector 10 made of plastic or metal, in which in the apex region of a light source 12 is used.
  • the light source 12 may be an incandescent lamp, a gas discharge lamp or another suitable lamp.
  • a lens 16 made of glass or plastic Seen in the light exit direction 14 after the reflector 10, a lens 16 made of glass or plastic is arranged, which may have, for example, a reflector 10 facing the flat side 18 and opposite a convex curved side 20.
  • the lens 16 is held in a support element 22 which may be connected to the front edge 24 of the reflector 10 pointing in the light exit direction 14.
  • the reflector 10 and the lens 16 may be arranged in a housing 15 having a light exit opening, which is covered with a translucent disc 17 made of glass or plastic.
  • the cover 17 may be smooth, so that uninfluenced by this light passes or alternatively at least partially have optical elements, is deflected by the passing light, for example, scattered.
  • the reflector 10 Through the reflector 10, light emitted by the light source 12 is reflected as a convergent light beam which passes through the lens 16 and is thereby deflected.
  • the lens 16 acts as a converging lens and through this the light passing through is refracted towards the optical axis 11 of the reflector 10.
  • the reflector 10 may, for example, have an at least approximately ellipsoidal shape, an ellipsoid-like shape or a numerically determined shape derived from the characteristic of the light beam to be reflected by the reflector 10.
  • an opaque aperture 26 may be provided which is disposed substantially below the optical axis 11 and on which only a portion of the light beam reflected by the reflector 10 can pass.
  • the light beam passing past the diaphragm 26 receives a light-dark boundary determined by the upper edge of the diaphragm 26, which is imaged by the lens 16 as the bright-dark boundary of the low-beam beam emerging from the headlight.
  • the aperture 26 may also be omitted if the shape of the reflector 10 is determined such that the light beam reflected by it already has the required light-dark boundary, which is imaged by the lens 16.
  • the reflector 10 has a cross section Q1 at its front edge 24 and the lens 16 has a smaller cross section Q2 with respect to this cross section Q1.
  • the support element 22 may have one or more webs 28, which extend from the front edge 24 of the reflector 10 to close to the lens 16, where they are interconnected, for example, by an annular portion 30 may be in which the lens 16 is held with its edge. Between the webs 28 remain openings 32, can pass through the emitted light from the light source 12, which can not be detected by the reflector 10.
  • the webs 28 are preferably formed as narrow as possible in order to obtain large openings 32 between them, so that a correspondingly large part of the light emitted by the light source 12 can pass through them.
  • At least one element 40 surrounding the lens 16 on at least part of its circumference is provided, which is shown in different embodiments in FIGS. 1 to 8.
  • the element 40 is made of translucent material such as glass or plastic.
  • the element 40 is formed at least in regions, preferably over its entire extension, as a Fresnel lens and in this case has a plurality of annular at least approximately concentric optically active profiles 42. As is shown in FIGS. 1 to 5, the optical profiles 42 can be arranged on the side of the element 40 facing the reflector 10 or else on the side of the element 40 which faces away from the reflector 10 and points in the light exit direction 14.
  • the optical profiles 42 are, for example, wedge-shaped formed and by this light passing through the element 40 light is deflected toward the optical axis 11 and thus collected.
  • the optical profiles 42 may, for example, be formed such that light emitted by the light source 12 after passing through it extends approximately parallel to the optical axis 11.
  • the element 40 can be arranged as shown in Figure 1 such that it has approximately the same distance from the reflector 10 in the direction of the optical axis 11 as the lens 16. Alternatively, the element 40, however, in the direction of the optical axis 11 a different distance from Reflector 10 may be arranged as the lens 16 and thus offset from the lens 16.
  • the optical profiles 42 for forming the Fresnel lens are arranged on the side of the element 40 facing the reflector 10.
  • the element 40 has an opening 41 for the passage of the lens 16.
  • the element 40 is formed substantially flat and formed on its side facing the light exit direction 14 side substantially smooth.
  • the profiles 42 for forming the Fresnel lens can also be arranged on the side facing the light exit direction 14 side of the element 40, in which case the reflector 10 facing side of the element 40 is formed substantially smooth.
  • an at least partially reflective coating 44 is applied on the side of the element 40 pointing in the light exit direction 14 at least in regions.
  • the coating 44 may be designed so that it is opaque, which is then only partially disposed on the element 40, to allow a partial passage of the light emitted from the light source 12.
  • the coating 44 can be designed in the form of lines or rings. From the outside of the coating 44 striking light is reflected by this.
  • the coating 44 may also be designed such that it is partially translucent and partially reflective. In this case, the entire surface of the element 40 may be covered by the coating 44 or even only part of its surface. In this case, light emitted by the light source 12 can partially pass through the coating 44 while on the outside Coating 44 incident light is partially reflected.
  • the element 40 is arranged approximately at the same distance from the reflector 10 as the lens 16.
  • the coating 44 is preferably made of metal, for example aluminum, and can be applied to the element 40 by means of known methods, for example by means of vapor deposition, sputtering, painting, printing or Shape.
  • the light transmission of the coating 44 can be varied by its thickness, the light transmission decreases with increasing thickness. In order to achieve a partial light transmission of the coating 44, this is thus carried out with a small thickness while it is designed to achieve a high degree of reflection with a correspondingly greater thickness.
  • the element 40 is shown according to a second embodiment, in which the element 40 deviating from the first embodiment is not flat but concave curved.
  • the element 40 in turn has the opening 41 for the passage of the lens 16, wherein the element 40 in the region of its opening 41 approximately the same distance from the reflector 10 as the lens 16 and extending from the lens 16 further in the light exit direction 14.
  • the amount of curvature of the element 40 can be selected according to the space in the headlamp and the desired appearance of the headlamp.
  • the element 40 has, on its side facing the reflector 10, the optical profiles 42 for forming the Fresnel lens and profiles raised at its side pointing in the light exit direction 14.
  • the profiles 46 may be formed, for example, approximately rectangular and have in the light exit direction 14 facing sides with flats 48.
  • a coating 44 may be applied, preferably on the in the light exit direction 14 facing flats 48 of the profiles 46 of the element 40 may be applied, while lying between the profiles 46 areas of the element 40 have no coating 44.
  • the coating 44 may in turn be reflective or partially reflective and partially translucent as in the first embodiment and applied as indicated therein.
  • the profiles 46 can of course also be provided in the planar element 40 according to the first embodiment, and the concavely curved element 40 according to the second embodiment can also be made smooth, ie without the profiles 46.
  • the element 40 is shown according to a third embodiment in which this is deviating convexly curved to the second embodiment, the rest of the formation of the element 40 is described the same as in the second embodiment.
  • the element 40 has in the region of its opening 41 for the lens 16 again about the same distance from the reflector 10 as the lens 16 and extends from the lens 16 against light exit direction 14. Again, the curvature of the element 40 can be chosen such that a desired appearance of the headlamp is achieved when viewing from the outside.
  • the element 40 may deviate from the embodiments described above also be formed approximately frusto-conical. In this case, the element 40 may be formed such that its cross-section, starting from the lens 16 in the light exit direction 14 or against the light exit direction 14 increases.
  • the element 40 according to the above-described first to third embodiments is shown in FIG a view opposite light exit direction 14 shown.
  • the lens 16 has a round cross section and the element 40 surrounds the lens 16 over its entire circumference and is annular.
  • the element 40 has the approximately round opening 41 for the lens 16 and an approximately round outer shape, but this can also be selected, for example, oval or angular. It can also be provided that the element 40 surrounds the lens 16 only on a part of its circumference and, for example, is arranged only laterally next to the lens 16 or only above and / or below the lens 16.
  • the side of the element 40 pointing in the light exit direction 14 has, over its entire surface, the profiles 46 which run as rings which are at least approximately concentric with one another.
  • the light passing through the element 40 is substantially not deflected. Deviating from the embodiment according to FIG. 4, the profiles 46 can also run in any other way, for example straight or curved.
  • the light passing through the element 40 causes illumination of the element 40, so that the illuminated surface of the headlight is enlarged relative to the surface of the lens 16.
  • the light passing through the element 40 also forms a light bundle in addition to the light beam passing through the lens 16, through which the actual low-beam light distribution is generated.
  • incident light is at least partially reflected by the coating 44 so that the element 40 appears at least approximately brilliant or reflective like a reflector. If the optical profiles 42 for forming the Fresnel lens are arranged on the side of the element 40 pointing in the light exit direction 14, then the coating 44 can also be applied thereto.
  • the element 40 is shown according to a fourth embodiment, in which this is formed substantially flat as in the first embodiment.
  • the element 40 has, on its side facing the reflector 10, the optical profiles 42 for forming the Fresnel lens and on its side pointing in the light exit direction 14 profiles 56 which are wedge-shaped and at its in the light exit direction 14 facing sides as shown in Figure 6 enlarged flats 58 have.
  • the coating 44 is applied, which in turn is designed to be reflective or partially reflective and partially translucent.
  • the coating 44 can be applied in a simple manner, for example by a printing or embossing process on the flats 58, without additional effort such as covers or the like, the areas between the flats 58 no coating 44th receive.
  • the wedge-shaped formation of the profiles 56 deflects light passing through them, the arrangement and formation of the profiles 56 being such that this deflection of the light passing through takes place in a predetermined strength and in predetermined directions.
  • the above-described configuration of the wedge-shaped profiles 56 can also be provided in a curved as in the second or third embodiment, element 40.
  • the profiles 42 forming the Fresnel lens can also be arranged on the side of the element 40 pointing in the light exit direction 14 and provided with the flats onto which the coating 44 is applied.
  • the element 40 according to the fourth exemplary embodiment is shown in a view opposite to the light exit direction 14.
  • the element 40 surrounds In this case, the lens 16, which has a round cross section, over its entire circumference and also has at least approximately a round cross section.
  • the cross-sectional shape of the element 40 may also differ from a round shape and be for example oval or rectangular.
  • the profiles 56 arranged on the side of the element 40 pointing in the light exit direction 14 and designed as explained above run in a line-shaped and substantially horizontal manner in the embodiment of the element 40 shown in FIG. Through the profiles 56, light passing through the element 40 is deflected downwards. This formation of the profiles 56 prevents light passing through the element 40 from causing excessive glare by extending above the light-dark boundary of the actual low-beam beam passing through the lens 16.
  • the element 40 is shown in a view opposite light exit direction 14 according to a modified embodiment, in which the profiles 56 are linear and substantially vertical. Through the profiles 56 light passing through the element 40 is thereby deflected in the horizontal direction and thus scattered in the horizontal direction. This reduces the glare caused by the light passing through the element 40 and also provides better visibility of the headlamp from lateral directions.
  • FIG. 9 shows the headlight according to a fifth exemplary embodiment, in which the basic construction of the headlight is the same as in the exemplary embodiments described above, but unlike the latter, the coating 44 is not applied to the element 40. It is arranged in the light exit direction 14 after the element 40 translucent disc 60th provided that surrounds the lens 16 at least on a part of its circumference. However, light passing through the lens 16 does not pass through the disc 60, and the disc 60 has an opening 62 for unimpeded passage of the light having passed through the lens 16.
  • the disk 60 is formed so as to extend over at least a portion of the optical path of the light transmitted through the element 40 or over the entire optical path thereof.
  • the coating 44 is applied at least to a region of the side of the pane 60 which faces in the light exit direction 14 and is designed to be at least partially reflecting.
  • the coating 44 may be arranged in the form of rings or lines on the disc 60 as in the embodiments described above, or as a partially transparent coating.
  • the disc 60 may be formed smooth or have at least on one side at least partially profiles that may also be formed such that it is deflected by passing light, the coating 44 may be applied to the profiles.
  • the disk 60 may be flat as shown in Figure 9, but alternatively also concave or convexly curved or approximately conical.
  • the disk 60 may have in the direction of the optical axis 11 about the same distance from the reflector 10 as the lens 16 or a different distance than the lens 16 and thus arranged offset to this.
  • the design of the headlamp according to the fifth embodiment makes it possible in particular to arrange the element 40 closer to the lens 16 on the reflector 10 and to arrange the disk 60 in the region of the lens 16 or at a greater distance from the reflector 10 between the lens 16 and the cover 17 whereby the appearance of the headlight can be improved because the coating 44 of the disc 60 is clearly visible from the outside when viewing the headlight.
  • At least one additional reflector 70 is arranged between the reflector 10, precisely its front edge pointing in the light exit direction 14, and the element 40.
  • the additional reflector 70 extends over at least a part of the circumference of the reflector 10, for example over approximately the same circumference as the element 40.
  • the additional reflector 70 reflects a part of the light emitted by the light source 12 that can not be detected by the reflector 10 in such a way that this light at least partially passes through the element 40.
  • the additional reflector 70 may, for example, be formed annularly around the front edge of the reflector 10.
  • the additional reflector 70 may be formed in the optical axis 11 containing axial longitudinal sections flat or in any way concave or convex curved.
  • the additional reflector 70 may be integrally formed with the reflector 10 or held on this as a separate part.
  • the additional reflector 70 may also be held, for example, on the support element 22 or in any other way.
  • light emitted directly by the light source 12 can pass through the element 40, which light can not be detected by the additional reflector 70.
  • At least one auxiliary reflector 70 configured as described above can also be provided in the headlamp according to the first to fourth embodiments.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Claims (10)

  1. Phare pour véhicules comprenant un réflecteur (10), une source de lumière (12), une lentille (16) traversée par la lumière réfléchie par le réflecteur (10) et un élément (40) au moins partiellement transparent qui entoure la lentille (16) au moins sur une partie de sa périphérie et que peut traverser la lumière émise par la source de lumière (12), et non captée par le réflecteur (10), pour être focalisée, l'élément (40) présentant au moins par zones la forme d'une lentille de Fresnel avec des profils (42) optiques annulaires,
    caractérisé en ce que
    l'élément (40) présente, sur sa face détourné du réflecteur (10) orientée dans la direction de sortie de lumière (14), des profils convexes (42 ; 46 ; 56) sur lesquels est déposé un revêtement (44) au moins partiellement réfléchissant.
  2. Phare selon la revendication 1,
    caractérisé en ce que
    l'élément (40) est pour l'essentiel plan.
  3. Phare selon l'une des revendications 1 ou 2,
    caractérisé en ce que
    l'élément (40) est courbe.
  4. Phare selon l'une quelconque des revendications 1 à 3,
    caractérisé en ce que
    les profils (42 ; 46 ; 56) présentent des méplats (48 ; 58) orientés dans la direction de sortie de lumière (14) et sur lesquels est déposé le revêtement (44).
  5. Phare selon l'une quelconque des revendications 1 à 4,
    caractérisé en ce que
    les profils (46 ; 56) s'étendent en forme d'anneau sur l'élément (40).
  6. Phare selon l'une quelconque des revendications 1 à 4,
    caractérisé en ce que
    les profils (46 ; 56) sont au moins approximativement rectilignes, en particulier au moins approximativement horizontaux ou verticaux.
  7. Phare selon l'une quelconque des revendications 1 à 6,
    caractérisé en ce que
    les profils (46 ; 56) sont formés pour permettre une déviation de la lumière les traversant.
  8. Phare selon l'une quelconque des revendications 1 à 7,
    caractérisé en ce que
    le revêtement (44) est déposé sur l'élément (40) au moyen d'un procédé d'impression ou de gravure.
  9. Phare selon l'une quelconque des revendications 1 à 8,
    caractérisé en ce que
    le revêtement (44) est partiellement réfléchissant et partiellement transparent.
  10. Phare selon l'une quelconque des revendications précédentes,
    caractérisé en ce qu'
    au moins un réflecteur supplémentaire (70) disposé entre le réflecteur (10) et l'élément (40), réfléchit au moins partiellement la lumière émise par la source de lumière (12) ne pouvant pas être captée par le réflecteur (10), de sorte qu'elle traverse l'élément (40).
EP98112725A 1997-07-10 1998-07-09 Projecteur de véhicule Expired - Lifetime EP0890785B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19729478 1997-07-10
DE19729478 1997-07-10
DE19814478A DE19814478A1 (de) 1997-07-10 1998-04-01 Scheinwerfer für Fahrzeuge
DE19814478 1998-04-01

Publications (3)

Publication Number Publication Date
EP0890785A2 EP0890785A2 (fr) 1999-01-13
EP0890785A3 EP0890785A3 (fr) 2001-01-17
EP0890785B1 true EP0890785B1 (fr) 2006-08-30

Family

ID=26038172

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98112725A Expired - Lifetime EP0890785B1 (fr) 1997-07-10 1998-07-09 Projecteur de véhicule

Country Status (3)

Country Link
US (1) US6220736B1 (fr)
EP (1) EP0890785B1 (fr)
DE (1) DE59813700D1 (fr)

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DE102016101769A1 (de) * 2016-01-26 2017-07-27 Ulrich Sattler Leuchte
CN105805668B (zh) * 2016-03-22 2019-05-24 天津伽蓝德汽车零部件有限公司 一种车载灯光增强型照明系统
CN109764303A (zh) * 2018-12-19 2019-05-17 深圳市九洲光电科技有限公司 一种双透镜led灯

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DE59813700D1 (de) 2006-10-12
EP0890785A2 (fr) 1999-01-13
US6220736B1 (en) 2001-04-24
EP0890785A3 (fr) 2001-01-17

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