EP2402647A2 - Module d'éclairage pour un phare de véhicule automobile - Google Patents

Module d'éclairage pour un phare de véhicule automobile Download PDF

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Publication number
EP2402647A2
EP2402647A2 EP11161288A EP11161288A EP2402647A2 EP 2402647 A2 EP2402647 A2 EP 2402647A2 EP 11161288 A EP11161288 A EP 11161288A EP 11161288 A EP11161288 A EP 11161288A EP 2402647 A2 EP2402647 A2 EP 2402647A2
Authority
EP
European Patent Office
Prior art keywords
light
diaphragm
diaphragm element
light module
roller
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
EP11161288A
Other languages
German (de)
English (en)
Other versions
EP2402647B1 (fr
EP2402647A3 (fr
Inventor
Matthias Brendle
Ernst-Olaf Rosenhahn
Benjamin Stauss
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
Application filed by Automotive Lighting Reutlingen GmbH filed Critical Automotive Lighting Reutlingen GmbH
Publication of EP2402647A2 publication Critical patent/EP2402647A2/fr
Publication of EP2402647A3 publication Critical patent/EP2402647A3/fr
Application granted granted Critical
Publication of EP2402647B1 publication Critical patent/EP2402647B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/17—Discharge light sources
    • 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
    • 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
    • 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
    • F21S41/321—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
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/40—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by screens, non-reflecting members, light-shielding members or fixed shades
    • F21S41/43—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by screens, non-reflecting members, light-shielding members or fixed shades characterised by the shape thereof
    • 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
    • F21S41/60—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution
    • F21S41/63—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on refractors, filters or transparent cover plates
    • F21S41/635—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on refractors, filters or transparent cover plates by moving refractors, filters or transparent cover plates
    • 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
    • F21S41/60—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution
    • F21S41/68—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on screens
    • F21S41/683—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on screens by moving screens
    • F21S41/698—Shaft-shaped screens rotating along its longitudinal axis
    • 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
    • F21W2102/10—Arrangement or contour of the emitted light
    • F21W2102/13—Arrangement or contour of the emitted light for high-beam region or low-beam region

Definitions

  • the invention relates to a light module for a headlight of a motor vehicle.
  • the light module comprises at least one light source for emitting light, at least one primary optics for bundling at least part of the emitted light, at least one secondary optic for projecting at least a part of the collimated light as light distribution onto a roadway in front of the vehicle.
  • the light module additionally comprises at least one roller-like diaphragm element with a longitudinal extent along a longitudinal axis of the diaphragm element.
  • the longitudinal axis is horizontal and transverse to an optical axis of the light module.
  • the diaphragm element is rotatable about the longitudinal axis.
  • the invention relates to a headlight for a motor vehicle with such a light module.
  • Headlamps are beside lights a part of the lighting equipment. While lights are primarily for the visualization of the vehicle for other road users, headlights are primarily to improve the visibility for a driver of the motor vehicle. For this purpose, headlights usually emit light in the direction of travel or at an angle to it. They are arranged in the front area of a vehicle and serve in addition to the traffic safety by visualizing the vehicle for other road users in particular the illumination of the road ahead of the vehicle, e.g. in the form of a dipped beam, high beam, fog light, Operafernlicht-, or hazard marking light distribution and in the form of adaptable to specific environmental situations and / or vehicle conditions light distributions, such as. A bend light, city lights, country road, motorway light distribution, etc., respectively to improve the visibility for the driver.
  • Headlamps comprise at least one light source in the form of an incandescent lamp, gas discharge lamp or one or more semiconductor light sources. They can work according to a reflection principle, whereby light emitted by the light source is reflected by a reflector onto the roadway in front of the vehicle to produce a desired light distribution. To generate a substantially horizontal bright-dark boundary of a dimmed light distribution, the light source has a diaphragm, or the reflector is designed so that the dimmed light distribution is generated without additional aperture alone by reflection of the emitted light from the light source.
  • the headlamps can work according to a projection principle, wherein light emitted by the light source after the bundling by a primary optics, for example.
  • a secondary optics eg. In the form of a projection or condenser, is projected onto the roadway in front of the vehicle .
  • an aperture element with an effective upper edge located in the beam path can be arranged between the primary and the secondary optics. The upper edge is displayed by the secondary optics as a bright-dark border on the road ahead of the vehicle.
  • the light source, primary optics, secondary optics and the diaphragm element can be combined to form a light module.
  • the headlights comprise a housing in which at least one light module is arranged to produce one or more desired light distributions.
  • a specific light distribution can be generated by a single light module, but it can also be generated by superposition of the partial light distributions generated by a plurality of light modules.
  • a light module can generate one or more light distributions.
  • the housing has a light exit opening, which is closed by a transparent cover glass or plastic.
  • the cover pane can be designed as a clear pane without optically active profiles (for example prisms) or at least in regions with optically effective profiles (so-called diffusion pane).
  • headlamps are often also lighting functions, such as position light, limiting light, flashing or daytime running lights with integrated.
  • these lighting functions can also be realized as a separate light in the motor vehicle.
  • a diaphragm element is known to be arranged in the headlamps operating according to the projection principle in the beam path between primary and secondary optics.
  • the bright-dark boundary comprises, for example, an asymmetrical bright-dark border with a lower section on the oncoming traffic side and a contrasted elevated section on the own traffic side. Between the sections, for example, there is a transition in Europe with a 15 ° increase, for example in the USA a transition with a gradual increase and in other countries with an otherwise formed increase.
  • the diaphragm element can be arranged essentially perpendicular to the optical axis of the light module, or it can be arranged substantially horizontal.
  • a horizontal aperture element known, which is mirrored to improve the light intensity in particular a low beam distribution.
  • the mirror surface of the horizontal diaphragm element extends from a focal plane or Petzval surface of the secondary optics (the projection lens) in the direction of a primary optic (the reflector).
  • the illuminance can be increased in an area directly below a substantially horizontal light-dark boundary.
  • a Petzval surface is a spherical or spherical surface on which, in the case of a real lens, images of individual points of an object arranged in a plane are imaged by the lens.
  • images of individual points of the object do not arise in one Plane, but in a first approximation on a spherical surface.
  • the so-called Petzval surface It follows from the reversibility of the light path that a sharp or precise image of an object is obtained in the plane when the object to be imaged is arranged on a curved or curved surface of the imaging system. Therefore, screens of projection modules for producing a dimmed light distribution (eg PES diaphragms) are sometimes not flat, but curved.
  • the EP 0 935 728 B1 is an aperture element known, which is formed roller-shaped. It is arranged with a longitudinal extent along a longitudinal axis horizontally and transversely to an optical axis of the light module.
  • the roller-like diaphragm element is rotatable about the longitudinal axis.
  • the roller-type diaphragm element of the known type is motor-driven, for example driven by a stepping motor, and has light-absorbing material on its outer circumference.
  • the driver of a vehicle has the subjective feeling of driving through a tunnel, since only a very limited area is illuminated at the top.
  • the limitation of the high beam, sub-beam or marker light distribution to a few degrees vertical is subjectively considered by the driver of the vehicle as depressing and disturbing.
  • the present invention has the object to solve the above conflict, in particular the known roller-like diaphragm element to design and further develop that on the one hand with a comparable roller diameter, a larger number can be achieved at different light distributions, without it on the other However, in the individual light distributions to a limited vertical extent and the so-called. "Tunnel effect" comes.
  • the longitudinal axis of the roller-shaped diaphragm element is preferably arranged between the secondary optics and their focal plane or Petzval surface.
  • the mirror surface is therefore located in the light exit direction behind the focal plane or Petzval materials the secondary optics (eg the projection lens) and extends into the area between the focal plane or Petzval materials and secondary optics into it.
  • Light source are preferably gas discharge lamps, the use of incandescent or semiconductor light sources is also possible.
  • the contours formed on the outer circumference of the diaphragm element are arranged within a cylindrical envelope.
  • the cylinder axis of the cylindrical envelope corresponds to the longitudinal axis of the diaphragm element.
  • the aperture diameter of the roller-like diaphragm element is accordingly the diameter of the enveloping cylinder.
  • the axis of rotation of the diaphragm element can serve the cylinder axis.
  • the invention is based on the idea to improve the effect of the light module at least for a preferred light distribution by selectively arranged reflective coatings on the peripheral surface of the roller-like diaphragm element.
  • the mirror coating must be designed so that in a certain preferred rotational position of the diaphragm element, the reflected light rays from the reflection can participate in the generation of light distribution on the road ahead of the vehicle. In this way, the efficiency of the light module can be improved.
  • light rays which are reflected, for example, at the reflective coating of the diaphragm element can be projected onto a reflector surface of a reflector Primary optics meet and from there then participate in the generation of the desired light distribution.
  • the light beams reflected at the mirroring of the diaphragm element can be used to increase the illuminated area in the horizontal and / or vertical direction, to increase the illuminance in certain areas within the light distribution.
  • a partial region of the diaphragm element which is responsible for illuminating a region of the light distribution above a substantially horizontal light-dark boundary of a dimmed light distribution, is at least partially mirrored.
  • the mirror coating can thus support, for example, a high beam distribution, split beam distribution or hazard marker light distribution or a high beam-like light distribution by increasing a vertical extent of the light distribution on the road and / or correspondingly increasing the light intensity above the light-dark boundary.
  • the mirrored portion of the diaphragm element between the secondary optics and the focal plane must be arranged. As a result, light beams from the light module can reach the desired range of light distribution.
  • the reflection of the diaphragm element increases the extent of the light distribution, in particular a high beam distribution, in the vertical direction. This leads to a good view of the driver of the motor vehicle in the high beam area and therefore contributes significantly to reducing the so-called. "Tunnel effect" and to improve the traffic safety. In the process, the comfort of the headlamp of his motor vehicle, which is subjectively perceived by the driver, is also increased.
  • the subregion of the diaphragm element which is responsible for the illumination of the region of the light distribution above the light-dark boundary comprises a circular segment-shaped or circular segment-like section with a planar or curved base surface viewed in a vertical section parallel to the optical axis
  • Aperture element is rotated in a basic position for generating the desired light distribution about the longitudinal axis such that the base surface in the vertical section viewed is aligned substantially parallel or inclined to the optical axis.
  • a depth of the circular segment-shaped or circular segment-like section of the partially mirrored diaphragm element should be less than a depth of a section of a diaphragm element without mirroring to produce said predetermined light intensity.
  • the depth of the peripherally formed recesses for generating a predetermined light distribution over conventional roller-type diaphragm elements can be reduced without mirroring. This is possible because of the reflection reflected light can be directed into areas of light distribution, which would actually be shadowed due to the smaller depth of the recesses.
  • the angular distances between the different diaphragm contours formed on the outer circumferential surface of the diaphragm element can also be selected to be smaller without a light distribution being impaired by the secondary contour.
  • the diameter of the roller-type diaphragm element can be reduced.
  • the diameter of the diaphragm element is defined as a diameter of a cylinder enveloping the diaphragm element.
  • the alignment of the base surface is variable by rotating the diaphragm element about its longitudinal axis for varying the light distribution.
  • the vertical illumination area on the road in particular the range of the emitted light beam, while driving if necessary, for example, depending on the speed or depending on the meteorological or traffic environment of the vehicle zoom in or zoom out.
  • the mirrored regions of the diaphragm element can be produced, for example, by vapor deposition, by cathode sputtering (so-called sputtering) or by galvanic or chemical deposition. But it can also mirror plates or mirror films are applied, for example, by gluing, Clamping, welding, riveting, screws, etc. can be attached to the desired areas on the outer periphery of the panel member. In this case, the mirror plates or mirror films may be preformed or pre-bent.
  • the light module comprises at least one sensor, through which a rotational position of the diaphragm element can be observed.
  • the current rotational position of the roller-like diaphragm element can be detected in a control unit for operating the light module and an exact positioning of the diaphragm element can be ensured by means of a control or a control with setpoint correction.
  • FIG. 1 shows a light module 10 according to the invention in a partial cutaway and perspective view.
  • the light module 10 has a frame 12 on which a reflector 14 is arranged.
  • the frame 12 is formed by a front edge of the reflector 14.
  • the reflector 14 is preferably formed ellipsoidal or in an ellipsoid shape similar freeform.
  • a light source preferably a gas discharge lamp 16 is arranged.
  • the light module 10 could alternatively also comprise a light bulb or at least one semiconductor light source, in particular one or more LEDs.
  • an ignition device 18 for operating, in particular for igniting the gas discharge lamp 16 is arranged.
  • a diaphragm element designed as a cylindrical diaphragm roller 22 is arranged after the reflector 14.
  • the diaphragm roller 22 has a longitudinal extent extending essentially horizontally and transversely to an optical axis 42 of the light module 10 and can be rotated about an axis of rotation 28 by a diaphragm drive 24.
  • the diaphragm drive 24 includes in the illustrated embodiment, an electric motor 24a and a spur gear 24b.
  • the diaphragm drive 24 may also be designed differently, for example. With an electromagnetic or piezoelectric actuator instead of the motor 24a, with a worm gear or any other gear instead of the spur gear 24b and / or without gear, so with a direct drive, such as. from the DE 10 2008 022 508 A1 known.
  • the diaphragm roller 22 has on its outer circumference different contours, each with extension in the horizontal direction and transverse to the optical axis 42. These can be moved by rotating the diaphragm roller 22 about the rotation axis 28 either in the beam path of the reflected light or out.
  • the each located in the beam path aperture contour forms an effective Oberkantenverstructure to form a horizontal bright-dark boundary of the light distribution on the road ahead of the vehicle.
  • a detailed description of the iris roller 22 follows below.
  • a secondary optics 26 in the form of a projection or convergent lens is arranged in the further course. The secondary optics 26 projects the light rays passing past the diaphragm roller 22 as desired light distribution onto the road ahead of the vehicle.
  • the effective upper edge of the diaphragm roller 22 is imaged by the lens 26 as a bright-dark boundary of the light distribution on the road.
  • the diaphragm roller 22 is in the light module 10 substantially in a focal plane 27 of the secondary optics 26 (see. FIG. 7 ) arranged.
  • FIG. 2 shows a detailed view of the diaphragm roller 22 in a specific rotational position.
  • the diaphragm roller 22 has a bearing element 30 at a free end.
  • the diaphragm roller 22 has a drive element 32 for the diaphragm drive 24.
  • the region of the diaphragm roller 22 lying between the bearing element 30 and the drive element 32 represents the actual effective region 34 of the diaphragm roller 22. This is the region which can be moved into the beam path and in which the various diaphragm contours are distributed over the circumference.
  • This in FIG. 2 Shutter element 22 shown has a diaphragm diameter D, which corresponds to the diameter of the enveloping cylinder.
  • the axis of rotation 28 represents the cylinder axis.
  • the in FIG. 2 Shutter contour shown has been generated by removing material in the active region 34, so that the aperture contour at least in sections runs within the enveloping cylinder. In particular, 34 different depths cutouts are formed in the active region, which together form the aperture contour shown. If the upper edge of a correspondingly formed contour is located in the beam path of the light module 10, then the contour forms a substantially horizontal light-dark boundary on the roadway for a completely or partially dimmed light distribution.
  • the diaphragm roller 22 Since the diaphragm roller 22 is arranged in the focal plane 27 of the secondary optics 26, the bright-dark border is sharply imaged on the roadway. By minimally rotating the diaphragm roller 22 about the rotation axis 28, the position of the effective region 34 and thus the position and sharpness of the light-dark boundary on the road can be changed. By further rotation, a completely different contour can be brought into the beam path of the light module 10 to form a differently configured bright-dark boundary.
  • the contours formed on the outer periphery of the shutter member 22 are arranged within a cylindrical envelope having a diameter D.
  • a cylinder axis of the envelope corresponds to the longitudinal axis 28 of the diaphragm element 22.
  • a multiplicity of different diaphragm contours can be formed, which extend in each case along the axis of rotation 28.
  • the number of possible contours is limited by the diameter D of the diaphragm roller 22 and the depth of the cutouts for generating the diaphragm contours. The smaller the diameter D of the diaphragm roller 22, the smaller the peripheral surface and thus the area available for the arrangement of diaphragm contours.
  • the diameter D of the diaphragm roller 22 can not be increased arbitrarily, because otherwise the proportion of the shade roller 22 shaded or absorbed light to becomes large and thereby the efficiency of the light module 10 bad.
  • the deeper the cutouts in the diaphragm roller 22 for producing the diaphragm contour the greater the vertical extent of the resulting light distribution.
  • the cutouts in the shutter roller 22 it is necessary for the cutouts in the shutter roller 22 to be relatively deep to avoid so-called "tunneling".
  • the deeper the cut-outs of a diaphragm contour the greater is the peripheral surface occupied by this diaphragm contour, and the less space is available for further diaphragm contours.
  • the diaphragm diameter D is to be reduced without the "tunneling effect" occurring in the different types of high beam distribution.
  • the diaphragm roller 22 is at least partially provided with a mirror coating.
  • the removed regions of the effective region 34 in the diaphragm roller 22 of the light module 10 according to the invention are at least partially mirrored.
  • the portions of a diaphragm contour are mirrored, which allow light to pass for illumination of the long range of a light distribution.
  • These are in particular the areas of the diaphragm contour which are viewed in a vertical section through the light module 10 (cf. FIG. 7 ) are aligned substantially parallel to the optical axis 42.
  • only a portion of the diaphragm roller 22 may be mirrored, so that the remaining areas are light-absorbing, that is, a large part of the light is absorbed there and not reflected.
  • FIG. 3 shows beam paths within the light module 10 according to the invention in the generation of a dimmed light distribution, such as dipped beam, fog light, city light, highway light or motorway light or other adaptive dimmed light distribution.
  • the mode of operation of the light module 10 corresponds to the production of the dimmed light distribution of the operation of a known from the prior art light module with a conventional diaphragm roller 22 without Veradorungen.
  • Emissive light beams of the gas discharge lamp 16 strike a reflective surface of the reflector 14 and are sent from there in the direction of the secondary optics 26.
  • the light rays may partially pass through the iris roller 22 (see reference numeral 36), but they may also be absorbed by the light absorbing layer of the iris roller 22 (see reference numeral 38).
  • the diaphragm roller 22 is positioned such that the desired dimmed light distribution is generated with a corresponding course and a corresponding position of the bright-dark boundary by the course of the placed in the beam path of the light module 10 effective upper edge of the diaphragm roller.
  • the light rays 36 passing through the iris roller 22 produce the illuminated area below the light-dark boundary on the road ahead of the vehicle; through the aperture roller 22 absorbed light beams 38 are largely uninvolved in the generation of the light distribution.
  • An increase in efficiency of the light module 10 could be achieved if, for the purposes of the present invention, the regions of the diaphragm roller 22, which are hit by the light rays 38, would be at least partially mirrored.
  • the light rays 38 would be reflected back onto the reflector 14 and could participate in the production of the dimmed light distribution, for example by the light beams 38 reflected back from the reflection producing a scattered light distribution which also covers areas above the light-dark boundary Intensity can illuminate.
  • FIG. 4 shows a known from the prior art light module 10 with a diaphragm roller 22, wherein the diaphragm roller 22 is made entirely of a light-absorbing material or coated with such.
  • the diaphragm roller 22 is positioned so that the light module 10 generates a high-beam distribution on the roadway, that is, the course of the effective upper edge of the diaphragm element 22 is arranged below and at a distance from the optical axis 42.
  • the diaphragm contour for producing the effective upper edge of the diaphragm roller 22 comprises a plane in the vertical section parallel to the optical axis 42, substantially horizontal region which extends substantially parallel to the optical axis 42.
  • FIG. 5 For better clarity is in FIG. 5 to the light module 10 off FIG. 4 a beam path for generating the high beam distribution is shown schematically.
  • FIG. 5 It can be seen that only those beam bundles reach the secondary optics, which strike a region of the reflector 14 close to the optical axis 42. From a certain distance of the emitted light beams 40 to the optical axis 42, these can no longer pass through the diaphragm element 22, but strike either the rear side of the diaphragm roller 22 directed towards the light source or the upper planar surface of the diaphragm contour of the effective upper edge. A part of the light emitted by the gas discharge lamp 16 thus hits the light-absorbing part of the diaphragm roller 22 (see reference numeral 40). The light beams 40 can thus make no contribution to the generation of the light distribution in front of the vehicle.
  • FIG. 6 shows one of the light module 10 from FIG. 4 or 5 produced high-beam distribution 45 on a arranged at a defined distance in front of the vehicle, vertical measuring screen. Due to the limited depth of the diaphragm contour of the effective upper edge on the outer peripheral surface of the diaphragm roller 22, the resulting light distribution 45 has only a limited extension in the vertical direction. An area above the light distribution 45, where only very low light intensity values are to be measured, is designated by the reference symbol 43. The high-beam distribution 45 is therefore bounded at the top by the shaded area 43. Thereby, the driver of a vehicle whose headlamps generate the high beam distribution 45 can give the subjective feeling of driving through a tunnel towards the top only a very limited area is illuminated. An aperture contour with a greater depth could increase the transition between high beam distribution 45 and shaded area 43. However, this would significantly reduce the space available on the peripheral surface of the diaphragm roller 22 for further diaphragm contours.
  • FIG. 7 shows a schematic representation of a beam path of a high beam distribution in the light module 10 according to the invention, which is equipped with a diaphragm roller 22 with at least partially mirrored areas.
  • the diaphragm roller 22 of FIG. 7 has in the newly formed section of the diaphragm contour for generating the high beam distribution (effective range 34) on a reflective coating 44.
  • the active region 34 extends parallel to the optical axis 42; but it can also be inclined to the optical axis 42.
  • the light rays 46 emitted by the light source 16 and of regions of the reflector 14 which are further away from the optical axis 42 strike the mirrored surface 44, in particular in a region between the secondary optics 26 and its focal plane 27, and are reflected there so that they can participate in increasing the vertical extent of the high beam distribution.
  • the light beams 46 reflected by the mirroring surface 44 preferably reach the secondary optics 26 in a region which serves to illuminate the roadway in front of the vehicle, in particular above a bright-dark boundary of a dimmed light distribution.
  • the rays 46 are reflected by the mirroring surface 44 as if they originated from a virtual focal point 48.
  • FIGS. 5 and 7 A comparison of FIGS. 5 and 7 shows that though a fulcrum 50 of the diaphragm roller 22 has the same distance .DELTA.Y to the optical axis 42, however, the distance .DELTA.Y 'of the effective upper edge of the effective region 34 to the optical axis 42 in the light modules 10 from the FIGS. 5 and 7 differently.
  • the distance ⁇ Y is largely identical to ⁇ Y '.
  • the effective upper edge in the effective region 34 of the partially mirrored diaphragm element 22 is positioned much closer to the optical axis 42 than the effective region 34 of the conventional diaphragm element 22 without mirroring.
  • the depth of the diaphragm contour can be reduced by the reflective coating 44.
  • the diaphragm contour requires a smaller peripheral surface of the diaphragm roller 22, so that more space is available for the further diaphragm contours.
  • FIG. 8 shows the light module 10 of FIG. 7 produced high-beam distribution on a arranged at a distance to the vehicle vertical screen. As in FIG. 8 is clearly visible, an area above the light-dark boundary on the roadway is additionally illuminated by the light reflected on the mirror 44 light rays 46. Despite the non-mirrored diaphragm rollers 22 (see. FIG. 5 ) reduced depth of the recesses of the effective diaphragm contour of the mirrored iris roller (see. FIG. 7 ) has produced by the light module 10 with mirrored diaphragm roller 22 high beam distribution 45 (see. FIG. 8a ) In about the same extent in the vertical direction as the light generated by the light module 10 with diaphragm roller 22 without mirroring light distribution 45 (see.
  • FIG. 6 In comparison with unobstructed diaphragm rollers 22 constant depth of the recesses of the effective diaphragm contour can be determined by the Mirroring 44 of the shadowed area 43 are shifted upward (see. FIG. 8b ), whereby the vertical extension of the high beam distribution or high-beam light distribution 45 is increased upward.
  • FIG. 9 shows four possible embodiments of the diaphragm roller 22 by way of example.
  • FIG. 9a shows a possible embodiment, for example, to generate a Crystalfernlichtver notorious, with only the part of the road is illuminated with high beam, where there are no other road users.
  • the portion of the diaphragm contour generating this high-beam area is provided with the reflective coating 44.
  • the VerLiteungs salt 44 thus represents only a portion of the entire effective range 34 and is arranged obliquely on the diaphragm roller.
  • FIG. 9b shows the diaphragm roller 22 of FIG. 9a in a rotated about the axis of rotation 28 position.
  • This diaphragm contour has a base surface which is substantially planar over the axis of rotation 28 and perpendicular thereto and which serves to generate the high-beam distribution over the entire effective region 34.
  • the entire base is provided with a mirror coating 44.
  • the mirror coating 44 on the diaphragm elements 22 of the FIGS. 9a or 9b can be applied for example by vapor deposition, sputtering or by electroplating or chemical deposition.
  • FIGS. 9c and 9d show diaphragm rollers 22, in which the mirror coating 44 over the entire effective range 34 through Mirror plates or mirror films have been realized.
  • the mirror plates or mirror films 44 are fastened by rivets on the diaphragm roller 22. Alternatively, they could also be attached to the panel member 22 by gluing, welding, clamping, screwing or otherwise.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
EP11161288.3A 2010-06-29 2011-04-06 Module d'éclairage pour un phare de véhicule automobile Not-in-force EP2402647B1 (fr)

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DE102010025557A DE102010025557A1 (de) 2010-06-29 2010-06-29 Lichtmodul für einen Scheinwerfer eines Kraftfahrzeugs

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EP2402647A2 true EP2402647A2 (fr) 2012-01-04
EP2402647A3 EP2402647A3 (fr) 2013-04-10
EP2402647B1 EP2402647B1 (fr) 2014-04-30

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Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011003814A1 (de) 2011-02-08 2012-08-09 Automotive Lighting Reutlingen Gmbh Lichtmodul eines Kraftfahrzeugscheinwerfers
DE102013103584A1 (de) * 2013-04-10 2014-10-16 Conti Temic Microelectronic Gmbh Verfahren und Vorrichtung zur Lichtregelung für ein Fahrzeug
DE102017106948A1 (de) 2017-03-31 2018-10-04 HELLA GmbH & Co. KGaA Lichtmodul für einen Scheinwerfer eines Fahrzeugs mit einem digital ansteuerbaren Lichtverteilungsmittel, insbesondere LCD-Scheinwerfer

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0935728B1 (fr) 1997-09-06 2004-05-26 Hella KG Hueck & Co. Projecteur pour vehicules
EP1357334B1 (fr) 2002-04-25 2007-11-07 Valeo Vision Module d'éclairage elliptique sans cache réalisant un faisceau d'éclairage à coupure et projecteur comportant un tel module
DE102008022508A1 (de) 2008-05-07 2009-11-12 Automotive Lighting Reutlingen Gmbh Verstelleinrichtung für eine Kraftfahrzeugbeleuchtungseinrichtung und Kraftfahrzeugbeleuchtungseinrichtung mit einer solchen Verstelleinrichtung

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19909413A1 (de) * 1999-03-04 2000-09-07 Hella Kg Hueck & Co Scheinwerfer für Fahrzeuge
DE10340961A1 (de) * 2003-09-05 2005-03-31 Hella Kgaa Hueck & Co. Scheinwerfer für Fahrzeuge
DE102008010028B4 (de) * 2008-02-20 2016-12-08 Hella Kgaa Hueck & Co. Projektionsscheinwerfer für Fahrzeuge
JP2009301763A (ja) * 2008-06-11 2009-12-24 Koito Mfg Co Ltd 車輌用前照灯

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0935728B1 (fr) 1997-09-06 2004-05-26 Hella KG Hueck & Co. Projecteur pour vehicules
EP1357334B1 (fr) 2002-04-25 2007-11-07 Valeo Vision Module d'éclairage elliptique sans cache réalisant un faisceau d'éclairage à coupure et projecteur comportant un tel module
DE102008022508A1 (de) 2008-05-07 2009-11-12 Automotive Lighting Reutlingen Gmbh Verstelleinrichtung für eine Kraftfahrzeugbeleuchtungseinrichtung und Kraftfahrzeugbeleuchtungseinrichtung mit einer solchen Verstelleinrichtung

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DE102010025557A1 (de) 2011-12-29
EP2402647A3 (fr) 2013-04-10

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