EP1792118A1 - Systeme optique pour un phare de vehicule automobile, unite d'eclairage pour un phare de vehicule automobile et phare de vehicule automobile - Google Patents

Systeme optique pour un phare de vehicule automobile, unite d'eclairage pour un phare de vehicule automobile et phare de vehicule automobile

Info

Publication number
EP1792118A1
EP1792118A1 EP05782168A EP05782168A EP1792118A1 EP 1792118 A1 EP1792118 A1 EP 1792118A1 EP 05782168 A EP05782168 A EP 05782168A EP 05782168 A EP05782168 A EP 05782168A EP 1792118 A1 EP1792118 A1 EP 1792118A1
Authority
EP
European Patent Office
Prior art keywords
optical
optical system
light
light beam
discontinuity
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.)
Withdrawn
Application number
EP05782168A
Other languages
German (de)
English (en)
Inventor
Harald Ries
Julius Muschaweck
Andreas Timinger
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.)
OEC AG
Original Assignee
OEC 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 OEC AG filed Critical OEC AG
Publication of EP1792118A1 publication Critical patent/EP1792118A1/fr
Withdrawn legal-status Critical Current

Links

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
    • F21S41/25—Projection lenses
    • F21S41/265—Composite lenses; Lenses with a patch-like shape
    • 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
    • F21S41/141—Light emitting diodes [LED]
    • F21S41/143—Light emitting diodes [LED] the main emission direction of the LED being parallel to the optical axis of the illuminating device
    • 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
    • F21S41/141—Light emitting diodes [LED]
    • F21S41/147—Light emitting diodes [LED] the main emission direction of the LED being angled to the optical axis of the illuminating device
    • 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
    • F21S41/255—Lenses with a front view of circular or truncated circular outline
    • 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
    • F21S41/322—Optical layout thereof the reflector using total internal reflection

Definitions

  • the invention relates to an optical system for a motor vehicle headlight, a lighting unit for a motor vehicle headlight and a motor vehicle headlight with such lighting units.
  • Conventional automotive headlamps usually have a small, strong light source. These light sources can be either in the form of halogen filament lamps or high pressure gas discharge lamps. Most of the generated light is directed by a reflector to be projected as a suitably formed light beam.
  • the reflected light beam bundle must have an approximately horizontally running cut-off line. Above this cut-off line, almost no light is allowed to avoid glare. This cut-off point is defined in the ECE standards (for example for Europe and Japan) as well as in the SAE (USA). These regulations also define a "hot spot", which states that at a small distance below the cut-off line, the maximum light intensity of the light beam or light cone should be.
  • the light intensity should not be greater than 440 cd (corresponds to 0.7 lux in 25 m distance) to the front and left (right-hand traffic) above the cut-off line. 3.
  • the light beam should extend in width to about 30 ° to the left and right, with the light intensity gradually drops to the edge area.
  • the cut-off line should rise slightly asymmetrically to the top right. This applies to legal transactions. 5.
  • the hot spot should have a small vertical extension of 1 ° to 2 °, so that the road is not illuminated too close to the vehicle bright.
  • the light intensity should drop evenly down to about 12 ° below the cut-off line.
  • a significant technical problem is the sharp cutting of the hot spot, because within 0.5 ° a contrast of the light intensity of 1: 50 is to be achieved. If the trimming is performed by means of a diaphragm, then this diaphragm must be adjusted extremely precisely, whereby thermal expansion effects due to the heating of the diaphragm must be considered.
  • incandescent headlamps with reflectors used to have almost parabolic reflectors, whereby the light beam was formed by a structured windshield. More recently, faceted free-form reflectors with a clear, unstructured windscreen have been increasingly used. The reflector is here divided into individual segments, each of which is responsible for a specific part of the light distribution. In the case of the dipped-beam headlamps with reflectors, glare is avoided by covering the filament with a metal cap. Due to this coverage and the relatively small amount of light that strikes the reflector, the usual efficiency of these headlamps (defined as the ratio of luminous flux on the screen to luminous flux of the filament) is about 30%.
  • Projection headlamps are built for both halogen incandescent and high pressure gas discharge (Xenon HID) lamps.
  • the light of the lamp is concentrated by an approximately elliptical reflector on a focal point and its surroundings.
  • an aperture Immediately below the focal point sits an aperture whose edge creates the cut-off line.
  • a lens forms the focal plane including the aperture on the street. The efficiency is due to the losses at the reflector, the vignetting of the projection line and the absorption on the aperture at around 25%.
  • From DE 100 62 105 A1 discloses a headlight for motor vehicles, which has an optical element in the form of a Cartesian oval. This optical
  • Element has a decoupling surface, in which a right-angled step or a step formed with a convex and concave-shaped surface is provided. Through these stages, in a plane arranged transversely to the emission direction, a plane is intended.
  • DE 195 19 872 A1 discloses a headlamp with a reflector which has a light source in a central area.
  • a diaphragm is arranged to form a cut-off line.
  • the reflector of the headlight has a plurality of segments which adjoin one another and form kink edges in the edge region.
  • This headlamp has several lenses.
  • the lenses are supplied with light by means of so-called light termination bodies.
  • the light termination bodies are optically coupled to the lens at one end and to a light source, which may be a light laser or a light emitting diode, at the other end.
  • This headlight is characterized in that the light termination body have a certain cross-sectional contour and thus form the light cone emitted by the lenses and in particular limit the edges of the light cone.
  • the invention has for its object to provide an optical system that eliminates the disadvantages discussed above.
  • the optical system according to the invention for a motor vehicle headlight is used for distributing a light beam of a luminous means. It has a primary optical element and a secondary optical element.
  • the primary optical element is formed with an optical surface having a discontinuity along a line, at least on one side adjacent to the discontinuity, the optical surface is smooth, and the discontinuous surface areas of the optical surface form with their discontinuity adjacent to the tangent planes an obtuse angle, so that the light beam is divided into two light beam sub-beams, wherein at least one of the light beam sub-beams has a sharp boundary edge generated by the discontinuity.
  • the optical secondary element is used to image the sharp boundary edge to a predetermined cut-off.
  • the light-dark boundary is not generated by a diaphragm but by the discontinuity in the optical surface.
  • the diaphragm By omitting the diaphragm, the disadvantages associated with the diaphragm, such as low efficiency due to the absorption of part of the light beam or complex technical realization of the diaphragm are eliminated.
  • the optical system according to the invention is particularly suitable for use together with a light-emitting diode as the light source. This is especially true if the further light beam sub-beam is imaged by the secondary element such that it is also used to illuminate a predetermined area.
  • the following problems can be eliminated, which occur in a headlight for motor vehicles, which has one or more light-emitting diodes as the light source: 1. Efficiency
  • LED headlamps are much more efficient than conventional headlamps due to the high cost of light emitting diodes and cooling problems. It is a total efficiency of 60% or more appropriate.
  • the aperture area and the entire space is limited by structural conditions in the motor vehicle. Due to the limited luminance of LEDs, LED spotlights must use a large portion of the aperture area to produce the hot spot.
  • the cut-off line should not be made by mapping one edge of a light-emitting diode.
  • this edge is usually smeared in white LEDs, because the blue-emitting light-emitting diode is covered with a luminescent dye layer of a certain thickness, which converts a portion of the blue light to yellow-red, so that in the mixture Light is created. A sharp edge is then no longer present, and the color produced varies across the edge.
  • the vertical extent of the hot spot should be 1 ° to 2 °. Due to the low luminance of light emitting diodes one includes with conventional
  • Optics for vehicle headlights shown light emitting diode a larger angle range than 2 °.
  • the low required vertical extent of the hot spots can not be achieved with a conventional optics.
  • the optical system according to the invention for a motor vehicle headlight can advantageously be used in conjunction with conventional incandescent lamps or high-pressure gas discharge lamps. For these lamps, the issue of efficiency is only of secondary importance.
  • the invention possible that in a simple manner, the initially contiguous beam of light of a lamp is divided into two light beam sub-beams with spatial distance from each other, so that one of the light beam sub-beams are permanently used as low beam or both beam as high beam.
  • a movable diaphragm is provided, which fades out the not to be used as low beam light beam sub-beam when only the low beam is generated, or releases when a high beam is to be generated.
  • the main advantage is that the aperture must be positioned much less precisely compared to conventional optical systems, because it ends with a free edge in the dark area between the two light beams, the entire dark area as a tolerance range for the arrangement of the edge of the Aperture is available.
  • Both embodiments described above are based on the principle that a light beam generated by a light source is divided by a discontinuity of an optical surface into two light beam sub-beams, whereby a sharp boundary edge is used, which is used as a cut-off.
  • Figure 1a - 1d a light-emitting element together with a primary lens in the
  • FIG. 1 a Top view (FIG. 1 a), in a view obliquely on the entry surface of the primary lens (FIG. 1 b), in a front view (FIG. 1 c) and in a side view (FIG. 1 d),
  • Figure 2 shows a section through the light emitting diode element
  • FIG. 4 a shows an angular distribution of the luminance of the arrangement from FIG
  • FIG. 4b shows an angular distribution of the luminance of the arrangement from FIG
  • Figure 5a - 5c an optical system comprising a light emitting diode element, a
  • Primary lens and a secondary lens in each case in side view, wherein ray bundles are shown and in individual figures different sections of the beam are shown,
  • Figure 6a - 6c an optical system comprising a light emitting diode element, a
  • Primary lens and a secondary lens in each case in side view, wherein ray bundles are shown and in individual figures different sections of the beam are shown,
  • FIG. 7 shows the illuminance distribution of the optical system according to FIGS. 5a-6c at the location of the secondary lens
  • FIG. 8 shows a further optical system with a primary lens and a
  • Figure 9 shows another optical system with a ring
  • Primary lens surrounds to radiation in the edge area on the
  • Figure 10 is an optical system with a movable aperture for a
  • Headlight for producing low beam and high beam.
  • This optical system has a light-emitting diode element 1, a primary lens 2 and a secondary lens 3.
  • the primary lens has an entrance surface 4 and an exit surface 5.
  • the primary lens 2 is aligned with its entrance surface 4 to the light emitting diode element 1, wherein in the present embodiment, the light emitting diode element 1 is almost in contact with the inlet surface 4 of the primary lens.
  • the exit surface 5 is aligned with the secondary lens 3.
  • the secondary lens 3 in turn has an entrance surface 6 and an exit surface 7, wherein the entry surface 6 is aligned with the primary lens 2.
  • the light-emitting diode element 1 has a light-emitting diode chip 8, which is cast in a hemispherical lens 9.
  • the lens 9 has no effect on the beam path of the light emitted from the LED chip 8 light rays and thus this has a Lambertian radiation in an angular range of ⁇ 90 °.
  • the primary lens 2 is arranged as close as possible to the light-emitting diode element 1, so that it covers as far as possible the entire light of the light-emitting diode element with its entrance surface 4 and can bundle it in the direction of the secondary lens 3.
  • the angular range of the light focused by the primary lens is approximately in the range of ⁇ 15 °.
  • the primary lens has two optical surfaces, the entrance surface 4 and the exit surface 5, an essential element of the invention being that at least at one optical surface there is discontinuity in the location, i. a step, or in the slope of the surface, i. a kink, formed along a line.
  • Suitable discontinuities are those in which the surface no longer has the property of GO smoothness (in the case of a step) or G1 smoothness (in the case of a kink) (Reference: Farin, G. (1997). Curves and Surfaces for Computer-Aided Geometry Design; Chapter 18, San Diego, CA, Academic Press, Ine).
  • the discontinuity is formed as a crease line 10 at the exit surface 5 of the primary lens 2.
  • the crease line 10 divides the exit surface 5 of the primary lens 2 into an upper segment 11 and a lower segment 12.
  • the segments 11, 12 border with their tangential planes adjacent to the crease line 10 at an obtuse angle.
  • the two segments 11, 12 are each smooth surfaces.
  • Suitable discontinuities are also stripes on an optical surface in which the surface has such a strong curvature that a coherent bundle of light beams is separated into two disjoint part light beam bundles, whereby at least one partial light beam bundle is sharply delimited by the curvature.
  • This sharp limit is a sudden drop in luminance to a very low luminance.
  • the discontinuity divides a previously sixteen ⁇ hanging light beam bundle into two disjoint beams of light beam, both of which can be used further. Since the areas opposite to the discontinuity surface areas with their adjoining the discontinuity tangent planes a form obtuse angles, the two light beam sub-beams are separated. In order to separate the light beam sub-beams, it is fundamentally necessary that the tangential planes adjoining the discontinuity are not parallel, ie that a separation of the light beam sub-beams is possible if the tangential planes include an acute angle.
  • the entrance surface 4 of the primary lens 2 is concave and rotationally symmetrical.
  • the bending line is provided at the entrance surface or the primary lens is provided with a plurality of bending lines.
  • the light emitting diode element 1 is a commercial Luxeon ® LED
  • the lens 9 has a diameter of about 5.6 mm.
  • the primary lens is about 10 mm thick and has a diameter of about 13 mm.
  • An essential functional element of the optical system according to the invention is the crease line 10, which forms a discontinuity running along a line. Due to this discontinuity that is emitted by the light-emitting element 1
  • Zone II Approximately in the middle between the two light beam sub-beams 13, 14 is the zone IM, which is dark. Above Zone III is Zone II, whose light is cut off at the bottom by the crease line 10. Looking from the lower edge region of the zone II to the primary lens 2, one sees a narrow strip of the LED chip 8 through the lens 2, the lower edge of this image being cut off by the crease line 10. This image is shown in FIG. 4b.
  • zone II there is the zone I. Looking from the zone I to the primary lens 2, you can see through the upper segment 11 of the primary lens 2 through the lower edge of the LED chip 8. At least in the upper part of zone I, these images of the LED chip 8 through the upper edge 15 of the Primary lens 2 cut off. Again, a sharp boundary of the light beam sub-beam in the zone I is created.
  • zone IV which is formed substantially similar to the zone II, but here in each case the upper edge of the image of the LED chip 8 is cut off from the crease line 10 and the lower edge of the image is a picture of the lower edge of the LED chip 8 is.
  • the light beam sub-beams are cut off, as in the zone I, by the edge of the primary lens 2, but here the cut-off takes place through the lower edge 16 of the primary lens 2. If one looks from the lower edge region of the zone 5 to the primary lens 2, one sees an image of the LED chip 8 whose lower edge is sharply cut off by the lower edge 16 of the primary lens 2 and whose upper edge is represented by the edge of the LED chip 8.
  • the zones Il and V are used to illuminate the hot spot and establish the sharp cut-off, since the secondary lens 3 turns the generated images of the LED chip upside down and thus the corresponding images, i. the corresponding light beam sub-beams are sharply delimited above, as will be explained in more detail below.
  • Images of the light-emitting diode chip 8 are thus imaged with the secondary lens, the term "mapping" not being used here in a strict sense to project a particular pixel of an image again to a specific pixel of the imaged image, but in the sense that Beams are deflected by the optical system such that in the vertical direction, a nearly perfect imaging takes place, whereas in the horizontal direction, the individual pixels are smeared.
  • a blurring in the horizontal direction when using light-emitting diodes as lighting means is advantageous because LEDs usually have a certain structure, which would be transmitted to the road in a perfect image.
  • the optical system according to the invention in particular the secondary lens, preferably has an astigmatism in the horizontal direction in the sections used for the hot spot and the light-dark boundary.
  • FIGS. 4a and 4b each show an illustration of the light-emitting diode chip with a viewing direction from a point from zone II. If the point from which the LED chip is viewed is close to the lower edge of zone II, you will see a narrow strip (Fig. 4b). The higher you go up to the top of Zone II, the wider the strip becomes. All of these images are superimposed on the light-dark border with their edge cut off by the discontinuity. As a result, more images are superimposed adjacent to the cut-off line than at a distance from the cut-off line. As a result, the luminance decreases gradually with increasing distance from the cut-off line and thus downwards.
  • this effect causes a point illuminated by this optical system to be illuminated by light originating from different locations of the light-emitting diode.
  • This in turn means that the color distribution varying over the location of the light-emitting diode is mixed at the respective point of light of different locations of the light-emitting diode, so that a uniform color distribution is achieved, at least in the hot spot.
  • FIGS. 5a-6c each show four sections I, II, IV and V of the secondary lens 3, which are assigned to zones I 1 II, IV and V from FIG. These individual sections can basically be designed as separate components. In the present
  • Embodiment they are formed as a one-piece body, wherein the function-irrelevant section in the zone III is not shown.
  • the exit surface 7 of the secondary lens 3 is formed as a spherical surface.
  • a spherical surface is easy to make.
  • the entrance surface 6 of the secondary lens 3 is formed differently in the respective sections I, II, IV and V in order to provide the desired functions in each case.
  • the section II of the secondary lens 3 is designed such that a focal line of this section exists and lies on the bending line 10 of the primary lens 2.
  • the crease line 10 is imaged in the infinite, that is, from the bending line 10 outgoing light rays are deflected by the section II of the secondary lens 3 in a parallel beam.
  • the secondary lens 3 is preferably arranged with respect to the primary lens 1 in such a way that the light rays emerging from the bending line 10 in the secondary lens are either horizontal or tilted downwards at an angle of up to 0.5 °.
  • the inclination angle is set to 0.3 °.
  • the section V of the secondary lens 3 is formed such that here also a focal line of this section exists and lies on the lower edge 16 of the primary lens 2, so that the outgoing of the lower edge 16 light rays are imaged by the section V of the secondary lens 3 to infinity ie that these light rays run parallel after passing through the secondary lens 3.
  • These light rays should also run downwards with an inclination in the range between 0 ° and 0.5 °, preferably with the inclination angle of 0.3 °.
  • the lower edge 16 represents a discontinuity in the sense of the present invention, since the light which passes the edge 16 up or down, is separated into two light beam sub-beams, which can be used both.
  • the use of the light below the edge 16 is shown below with reference to the embodiment shown in FIG. In the mathematical sense here is a discontinuity, since the light passing below the edge 16 of a further optical surface must be redirected and this other optical surface and adjacent to the lower edge 16 optical surface of the primary lens 2 are not continuous to each other.
  • the section II of the secondary lens 3 is also referred to below as the upper cut-off lens and the section V of the secondary lens 3 as the lower cut-off lens.
  • the hot spot is illuminated, with the illuminated area in the horizontal covers approximately an angle range of 10 °.
  • the light beam sub-beams are superimposed at a certain distance from the optical system (FIG. 6c), with all the light beam sub-beams having a defined upper limit.
  • FIGS. 6a to 6c the optical system from FIGS. 5a to 5c is shown in FIGS. 6a to 6c, with three beam bundles in each case being shown in the two cut-off lenses in FIGS. 6a to 6c.
  • Off lenses run through a point.
  • These beams each comprise light beams which are emitted by a larger area of the LED chip 8.
  • These light beam bundles thus represent the image of the LED chip 8, which can be seen when looking from the point at the exit surface 7 of the secondary lens 3 to the primary lens 2, through which the respective light beam passes.
  • the light beams can be seen that in the area between the LED chip 8 and the
  • Secondary lens 3 arranged below beams of the light beam after passing through the secondary lens 3 are arranged above in the respective light beam. That is, with the image of this optical system, the image of the LED chip 8 after the passage of the secondary lens 3 is turned upside down. This in turn means that the light beam bundles which are cut sharply by the crease line 10 or by the lower edge 16 and which run through the cut-off lenses are each sharply delimited at their upper edge. The individual light beams that pass through the cut-off lenses are superimposed at a certain distance from the optical system, so that a total light beam is generated with a sharp upper limit ( Figure 6b, 6c). Guidelines for headlamps prescribed by motor vehicle headlamps.
  • the sharp boundary is generated by the bend line 10 of a part of the light beam, namely the one which passes through the upper cut-off lens.
  • This crease line which represents a discontinuity line, has the advantage over the use of a diaphragm that no light is absorbed, but light on both sides of the crease line 10 can be used for illumination.
  • light passing through the lower cut-off lens is also used to illuminate the hot spot.
  • Discontinuity line thus allows a significant increase in the efficiency of the optical system.
  • the discontinuity line extends in the projection on a vertical plane which is perpendicular to a connecting line between the primary lens and the secondary lens, approximately horizontally or has a slight inclination relative to the horizontal, which may be in the range of 0 ° to 10 °.
  • the projection of the discontinuity line at an edge region is guided somewhat downwards, so that the cut-off line rises somewhat asymmetrically in accordance with the demands of the automobile industry.
  • the light beams passing through the sections I and IV of the secondary lens 3 are also used.
  • the portions I and IV of the secondary lens are provided on the entrance surface with grooves, which are similar to a Fresnel lens and serve to deflect light into the lateral edge areas adjacent to the hot spot to effect some illumination here.
  • the efficiency of this optical system can be increased by providing a ring 17 around the primary lens 2, with which stray light from the light emitting diode is directed onto the secondary lens by means of refraction or total reflection (FIG. 9).
  • optical system according to the invention Another advantage of the optical system according to the invention is that the distance between the primary lens 2 and the secondary lens 3 is only 3 cm. Thus, this optical system has a very small overall depth compared to conventional projection headlights. In the case of conventional projection headlamps, a real intermediate image must be generated in the region of the diaphragm, which requires a considerable structural depth. In the optical system according to the invention, no intermediate image is generated, but the light beams are divided into light beam sub-beams by means of the discontinuity, which are deflected separately from the acting as a secondary lens secondary lens. It is not necessary to create a real intermediate image here. At the
  • optical system according to the invention is very compact, several such optical systems can be combined to form a vehicle headlight, in which case Light multiple light emitting diodes is used to generate the light cone of the vehicle headlight.
  • the above-described embodiment can be provided in the context of the invention on the primary lens 2 instead of a plurality of discontinuity lines.
  • the discontinuity lines can also be arranged in the region of the entrance surface of the primary lens 2.
  • a mirror or reflector 18 (FIG. 8) can also be provided, which images the sharp boundary edge of the light beam sub-beams onto the light-dark boundary.
  • a light emitting diode chip 8 is used with a lens 9, which is arranged immediately in front of the primary lens 2.
  • the light beam sub-beams of Zones I and IV ( Figure 3) may also be used if e.g. another lens is inserted into the optical system, which turns the image upside down.
  • the LED chip 8 into the primary lens 2, so that the lens 9 is omitted.
  • This is also useful in mass production of such an optical system.
  • the discontinuity according to the invention is realized in the light-emitting diode element 1, which is formed from the light-emitting diode chip 8 and a lens which fulfill both the function of the lens 9 and the function of the primary lens 2.
  • the optical system according to the invention together with a luminous means, in particular a light-emitting diode, a lighting unit.
  • a luminous means in particular a light-emitting diode
  • a lighting unit can be used in a headlight for a motor vehicle, in particular for low beam.
  • These lighting units can each have a separate secondary lens.
  • FIGS. 1a to 9 a light-emitting diode is used as the luminous means.
  • the inventive system with a discontinuity line in the optical primary element is particularly suitable for the use of light emitting diodes in headlights for motor vehicles, as this the above-mentioned problems in terms of efficiency, size, cut-off, vertical extension of the hot spot and use of the aperture, such as they would occur in conventional optical systems, be easily remedied.
  • the optical system according to the invention is also suitable for use with other light sources.
  • FIG. 10 shows an exemplary embodiment with a conventional illuminant 19 for motor vehicle headlights, such as, for example, an incandescent lamp, a high-pressure discharge lamp, a gas discharge lamp or the like.
  • the light of the luminous means 19 is detected by the primary lens 2, which has a discontinuity line 10 like the primary lenses 2 of the above embodiment.
  • the discontinuity line 10 two partial beams of light are generated and deflected to the secondary lens 3.
  • the upper light beam sub-beam has an area with the bottom sharply cut off by the crease line 10 boundary. By mapping this sharply cut boundary to the cut-off line, this area of the upper beam of light beam can be used as a dipped beam.
  • the lower beam sub-beam is deflected in this embodiment of the secondary lens 3 so that it acts as a high beam. The switching of this headlight from high beam to low beam is done simply by inserting a shutter 20 in the lower beam sub-beam.
  • the diaphragm 20 absorbs the lower beam part of the beam, whereby only the dipped beam exits the headlight. If the diaphragm 20 is moved out of the lower light beam sub-beam, the light of the lower beam sub-beam also emerges from the headlight and produces the high beam.
  • the diaphragm is located in the lower light beam sub-beam, it ends with its upper edge 21 in the dark region between the two light beam sub-beams.
  • the upper edge 21 can be positioned relatively imprecise, since this edge has no optical function.
  • the extension and retraction of the aperture 20 can be realized with simple inexpensive means.
  • the diaphragm 20 has a large area compared to conventional diaphragms on which a real intermediate image of the luminous means is projected, since it does not have to hide a small portion of a real intermediate image but can completely hide a partial light beam. This makes it much easier to cool the bezel, as is the case with conventional headlamps.
  • this design of a headlight allows a freer design of the high beam.
  • the aperture may also be arranged in the upper light beam sub-beam and the lower beam sub-beam used as dipped beam.
  • the lower edge 16 of the primary lens 2 is mapped to the light-dark boundary.
  • the exemplary embodiments presented above each have a discontinuous line of curvature 10, which is formed on an optical surface of the primary lens. In the area of the crease line, the adjacent surface sections with their tangential surfaces form an obtuse angle. This type of crease line can be formed both at the entrance surface and at the exit surface of the primary lens.
  • a reflector may also be provided. This applies in particular to the embodiment according to FIG. 10 with a conventional luminous means.
  • the discontinuity is formed by an edge in the reflector, in which the adjacent tangential surfaces form an angle of> 180 °.
  • the discontinuity may also be formed as a step in both the lens and the reflector.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

L'invention concerne un système optique pour un phare de véhicule automobile, une unité d'éclairage pour un phare de véhicule automobile, ainsi qu'un phare de véhicule automobile muni de telles unités d'éclairage. Le système optique selon l'invention comprend un élément primaire optique (2) et un élément secondaire optique (3). L'élément primaire optique présente une discontinuité (10) servant à générer deux faisceaux partiels de rayons lumineux dont l'un au moins est nettement délimité. Cette délimitation nette peut être utilisée pour générer une limite clair-obscur.
EP05782168A 2004-09-09 2005-09-07 Systeme optique pour un phare de vehicule automobile, unite d'eclairage pour un phare de vehicule automobile et phare de vehicule automobile Withdrawn EP1792118A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004043706A DE102004043706B4 (de) 2004-09-09 2004-09-09 Optisches System für einen Kraftfahrzeugscheinwerfer, Beleuchtungseinheit für einen Kraftfahrzeugscheinwerfer und Kraftfahrzeugscheinwerfer
PCT/EP2005/009612 WO2006027230A1 (fr) 2004-09-09 2005-09-07 Systeme optique pour un phare de vehicule automobile, unite d'eclairage pour un phare de vehicule automobile et phare de vehicule automobile

Publications (1)

Publication Number Publication Date
EP1792118A1 true EP1792118A1 (fr) 2007-06-06

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EP05782168A Withdrawn EP1792118A1 (fr) 2004-09-09 2005-09-07 Systeme optique pour un phare de vehicule automobile, unite d'eclairage pour un phare de vehicule automobile et phare de vehicule automobile

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Country Link
EP (1) EP1792118A1 (fr)
DE (1) DE102004043706B4 (fr)
WO (1) WO2006027230A1 (fr)

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WO2006027230A1 (fr) 2006-03-16
DE102004043706B4 (de) 2010-04-01

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