EP2730838B1 - Module d'éclairage pour projecteur de véhicule automobile comprenant plusieurs sources lumineuses - Google Patents

Module d'éclairage pour projecteur de véhicule automobile comprenant plusieurs sources lumineuses Download PDF

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Publication number
EP2730838B1
EP2730838B1 EP13192221.3A EP13192221A EP2730838B1 EP 2730838 B1 EP2730838 B1 EP 2730838B1 EP 13192221 A EP13192221 A EP 13192221A EP 2730838 B1 EP2730838 B1 EP 2730838B1
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EP
European Patent Office
Prior art keywords
sources
source
image
module according
light
Prior art date
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Active
Application number
EP13192221.3A
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German (de)
English (en)
French (fr)
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EP2730838A1 (fr
Inventor
Pierre Albou
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valeo Vision SAS
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Valeo Vision SAS
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Publication of EP2730838B1 publication Critical patent/EP2730838B1/fr
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/04—Optical design
    • F21V7/043—Optical design with cylindrical surface
    • 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
    • F21S41/148—Light emitting diodes [LED] the main emission direction of the LED being angled to the optical axis of the illuminating device the main emission direction of the LED being perpendicular to the optical axis
    • 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]
    • F21S41/151—Light emitting diodes [LED] arranged in one or more lines
    • 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]
    • F21S41/155—Surface emitters, e.g. organic light emitting diodes [OLED]
    • 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
    • F21S41/275—Lens surfaces, e.g. coatings or surface structures
    • 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
    • F21S41/323—Optical layout thereof the reflector having two perpendicular cross sections having regular geometrical curves of a distinct nature
    • 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
    • F21S41/65—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on light sources
    • F21S41/663—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on light sources by switching light sources

Definitions

  • the invention relates to lighting devices such as headlights for motor vehicles.
  • the document EP 2,500,628 A2 describes a known automotive headlamp employing a row of light-emitting diodes associated with a reflector having a planar portion and with a projection lens to perform an adaptive road lighting function.
  • the first provides lighting across the entire width of the road ahead of the vehicle.
  • the second provides lighting of the lane in which the vehicle is located and reduced lighting of the lane next to it and in which vehicles are likely to come into the wrong direction. In this way, the occupants of the latter are not dazzled.
  • the most common form of the dipped beam headlamps does not provide sufficient illumination for the side of the road located beyond this adjacent lane. This is a source of danger. For example, if a pedestrian on this sidewalk is about to cross the road, the driver will not be visible early enough.
  • an adaptive light function has been proposed which makes it possible to selectively illuminate certain parts of the scene in front of the vehicle at a long distance and in particular the aisle located beyond the adjacent lane.
  • an observation device analyzes the scene and selects the areas to be lit.
  • a projector for implementing this operation is presented in the document EP-2,278,217 . It includes several contiguous modules intended to form the respective bands. Each module includes a light source, a reflector and a lens for making one of the strips.
  • the reflector has a shape such that it spreads the light from the source in the vertical direction and that the lower part of the strip is more illuminated than its upper part.
  • An object of the invention is to overcome this drawback and therefore to reduce the volume of the device making it possible to selectively illuminate different areas of the scene visible in front of the vehicle.
  • the sources are associated with the same reflector and the same lens.
  • the volume of the device is therefore considerably reduced.
  • the light source is defined as the light emitting surface of an organ such as an LED.
  • the lens is arranged so that the image formed by the lens of an object placed at one of its focal points has a sharp outline over its entire length.
  • a sharp outline is defined as follows: Let I (h, v) be an intensity as a function of two angles h and v (for example equal to log (illumination on a screen at 25 m).
  • the contour is said to be sharp if at each point the contrast is greater than a predetermined threshold (for example 0.13 according to the European standard).
  • the reflector presents, in a plane perpendicular to the generatrices of the cylinder, a section shaped so as to increase a dimension of an image of each source by the reflector and so that an average value of a luminous flux in an upper half of the image of each source projected by the lens is less than an average value of the flow in a lower half of the image.
  • the light power supplied is greater at the bottom of the spots than at the top.
  • the reflector has a curved section having an inflection point, preferably a single point.
  • Such a shape promotes obtaining a good distribution of light in each of the spots, in the vertical direction.
  • the lens is arranged so that a sharpness of an overall image of the sources provided by the lens is maximum at at least two predetermined points of this image in comparison with other areas of the image.
  • the device therefore produces comfortable lighting for the driver of the vehicle and allows him to understand the scene in front of the vehicle as best as possible.
  • the points are located on the edges of the images of two sources, these images being immediately adjacent to an image of the same source, these edges being located on the side of the image of the latter.
  • the points are located on the edges of the images from two sources, these images being immediately adjacent to each other, the edge of each image being located on a side opposite to the other image.
  • Each of these two embodiments represents a good compromise for optimizing the lens and obtaining satisfactory lighting.
  • one face of the lens has undulations.
  • This characteristic makes it possible to slightly blur the upper horizontal edge of the spots to avoid having a too clear cut in light intensity between the spot and the environment, generally at night, which improves the comfort and the pleasure of the driver.
  • the face of the lens having the undulations is an exit face of the light from the sources.
  • each source has a square shape in a plane perpendicular to a main direction of light emission by the source.
  • Such sources in particular when they are constituted by light-emitting diodes, have a lower cost price than the sources of rectangular shape, which makes their use advantageous.
  • the module according to the invention makes it possible to obtain a large spread in the vertical direction from from square sources.
  • the module is arranged so that the sources can be individually controlled from one another.
  • the module comprises a screen forming an obstacle to the direct transmission of light from the sources to the lens.
  • this light transmitted directly to the lens indeed forms stray rays in the bands.
  • a motor vehicle headlamp which comprises at least one module according to the invention and preferably comprises several.
  • This projector can also constitute a signaling device.
  • Another object according to the invention is a motor vehicle comprising at least one module or a lighting device according to the invention.
  • the module 2 comprises light sources 4, a cover or screen 6, a mirror or reflector 8 and a lens 10.
  • the light sources 4 are produced in this case in the form of light-emitting diodes. They are arranged to produce upward-oriented lighting with their vertical optical axis. Here they have a square shape in view in a plane perpendicular to this optical axis. Each source has in plan a surface equal for example to 1 mm 2 . The sources are aligned in a direction parallel to the X axis. The sources are for example carried by a printed circuit 12 common to all the sources. The number of sources is arbitrary. It is greater than or equal to three and the highest possible, each source producing one of the bands forming the lighting.
  • the light sources are arranged so that there is a straight line passing through all of the sources, in particular through one of the edges of each source.
  • the contours of the sources are contained in the same plane.
  • Each source has two opposite edges, and the opposite edges of all sources are parallel to each other. The edges are parallel to the optical axis.
  • the screen 6 is arranged to prevent light from sources from arriving directly on the lens 10.
  • the latter has a rear face 14 and a front face 16 so called with reference to the path of the light from the sources and to the direction of travel of the vehicle. As illustrated in figure 2 , at least part of the light from each source 4 is reflected by the reflector 8 in the direction of the face 14 and then leaves the lens by the face 16 in the form of rays parallel to each other and to the axis Y.
  • the overall image 20 produced by the module on a vertical screen which would be arranged in a plane parallel to the axes X and Z across the road 22 in front of the vehicle.
  • This overall image is divided into as many vertical rectangular bands 24 as there are sources 4.
  • the height of each band is greater than its width.
  • the bands are juxtaposed by their vertical edges. Some of the bands extend in front of the vehicle to illuminate the entire road, in this case the two lanes of the latter and other bands, beyond the previous ones in the direction of the X axis, so as to illuminate the roadside.
  • the strips 24 are identical to each other. However, it can be expected that these bands differ in their width and / or in their length. Similarly, here, the upper and lower horizontal edges of the bands are respectively coincident. But this is not compulsory. In addition, a single horizontal row of strips is provided here. However, provision can be made for the module to produce at least two horizontal rows of strips extending one above the other.
  • the face of the reflector 8 exposed to the light of the sources has a cylindrical shape, the generatrices of the cylinder being parallel to the axis X. It has a section in a plane parallel to the axes Y and Z, shown in the figure 3 , on which the generators are based.
  • the lens 10 receives light from all the sources 4, it is optically optimized so that the strips 24 forming the images of the sources have the sharpest vertical edges possible. We will see later how this optimization is achieved.
  • the lens is common to all the sources and that the latter are preferably of small dimensions, producing the reflector 8 in the form of an anamorphoser does not allow simple results to be obtained. This is the reason why we choose here to calculate the shape of the reflector so that it gives satisfactory or even optimal results.
  • the shape of its illustrated section the figure 3 is distinct from a line segment and a conic.
  • the first consists in spreading along the vertical direction of the image of each source 4 so that the reflector produces a rectangular image 24 of a square source.
  • the second function consists in distributing the light power coming from the source so as to provide more light power in the lower part of the strip 24 only in the upper part. More specifically, it is sought to ensure that the light power in the strip per unit area is all the lower the greater the distance from the lower edge of the strip.
  • ⁇ The values of ⁇ are brought back between 0 and 1 by an affine transformation, from the weakest to the strongest.
  • the integral being taken from the source is the integral being taken from Otherwise, where n y and n z are the non-zero coordinates of the unit vector normal to the reflector at the point considered.
  • the virtual images created at any point of the reflector are of the same size and E r is therefore the emittance of the virtual image of the point (0, y r , z r ).
  • the orientation which the normal to the reflector must have in order to produce the desired offset is calculated. Once this orientation has been determined for all the points of the reflector, the position of each point is determined knowing that one starts from the lower edge of the reflector which is common to the plane reflector oriented at 45 °. We can therefore build the reflector step by step. This orientation calculation and this construction can be performed without difficulty by a computer program.
  • an average value of a light flux in an upper half of the image 24 of each source projected by the lens is less than an average value of the flux in a lower half of the image.
  • the lens 10 is optimized in its two dioptres to minimize annoying aberrations.
  • Figures 8 and 9 two modes of implementation of this optimization. These figures show the images 26 of the sources as they are reflected by the reflector. These are aligned rectangular strips, the largest dimension of which is measured in the vertical direction. The bands are not contiguous.
  • the optical axis 28 of the lens which is parallel to the axis Y, passes through the vertical plane of symmetry of the image 26a from the source located at the center of the alignment.
  • the images 26b and 26c of the two adjacent sources are the closest to the central image 26a.
  • the lens is optimized so that the following two edges benefit from maximum clarity: the vertical edge 30 of the image 26c which is closest to the image 26a and the vertical edge 30 of the image 26b which is the closest of image 26a.
  • the lens is therefore optimized to promote the sharpness of the vertical edges closest to the optical axis of the images of the lateral images 26b and 26c.
  • the images of the edges of the central image 26a are somewhat blurred, as are the outer lateral edges of the images of the images 26b and 26c. We can then obtain three reasonably clear bands but having a lower sharpness in the case of the figure 9 explained below. This mode is applicable when it is desired to have a high overlap of the beams of the left and right headlights of the vehicle when these are designed in accordance with the invention.
  • the optical axis 28 of the lens passes through the vertical plane of symmetry of the interval 32 located at the center of the alignment, between two of the images 26. These are therefore two images adjacent to each other .
  • the lens is optimized so that the edge 35 of each of these two images 26 which is furthest from the interval benefits from the maximum sharpness.
  • This case is applicable when the beam of the module extends slightly towards the interior of the vehicle. In this case, the images of the edges of the images closest to the optical axis are a little blurred. This case makes it possible to obtain two very clear bands and applies when it is desired to have a low overlap of the beams of the left and right headlights of the vehicle when these are designed in accordance with the invention.
  • the module according to the invention makes it possible in particular to obtain strips whose vertical edges are suitably sharp.
  • the module according to the invention makes it possible to produce a beam having no black bands on the image 20 between the bands 24. This thus avoids a comb effect detrimental to the aesthetics.
  • the outlet face 16 of the lens has undulations having a depth of a few microns. These undulations have the effect of slightly blurring the small upper and lower sides of each strip so that the light transition between the strip and its environment at its vertical ends is carried out as smoothly as possible.
  • the sources are addressable so as to make it possible to control, by means of suitable control means of the module, the production of each strip of light individually from one another.
  • the greatest total length measured along the Y axis between the lens and the reflector is approximately 40 mm.
  • this module also performs the function of high beam and / or low beam, possibly on its own or in addition to one or more other devices.
  • a headlamp comprising such a module can also be equipped with one or more signaling lights.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (AREA)
  • Geometry (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)
EP13192221.3A 2012-11-12 2013-11-08 Module d'éclairage pour projecteur de véhicule automobile comprenant plusieurs sources lumineuses Active EP2730838B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1260695A FR2998036B1 (fr) 2012-11-12 2012-11-12 Module d'eclairage pour projecteur de vehicule automobile comprenant plusieurs sources lumineuses

Publications (2)

Publication Number Publication Date
EP2730838A1 EP2730838A1 (fr) 2014-05-14
EP2730838B1 true EP2730838B1 (fr) 2020-04-22

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP13192221.3A Active EP2730838B1 (fr) 2012-11-12 2013-11-08 Module d'éclairage pour projecteur de véhicule automobile comprenant plusieurs sources lumineuses

Country Status (3)

Country Link
EP (1) EP2730838B1 (enrdf_load_stackoverflow)
JP (1) JP6309246B2 (enrdf_load_stackoverflow)
FR (1) FR2998036B1 (enrdf_load_stackoverflow)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109404851B (zh) 2014-09-30 2021-07-27 麦克赛尔株式会社 车辆用灯具
FR3041072B1 (fr) 2015-09-14 2020-01-17 Valeo Vision Module d'eclairage de projecteur de vehicule automobile et projecteur associe
FR3130011B1 (fr) * 2021-12-07 2024-04-05 Valeo Vision Dispositif lumineux d’un véhicule automobile

Family Cites Families (13)

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Publication number Priority date Publication date Assignee Title
FR2535014B1 (fr) * 1982-10-26 1987-11-20 Bui Hai Nhu Dispositif d'eclairage aerodynamique a couverture azimutale elargie
JP3677720B2 (ja) * 1998-10-27 2005-08-03 スタンレー電気株式会社 プロジェクター型ヘッドランプ
JP4615417B2 (ja) * 2005-10-13 2011-01-19 株式会社小糸製作所 車両用前照灯の灯具ユニット
JP4597890B2 (ja) * 2006-03-29 2010-12-15 株式会社小糸製作所 車両用前照灯の灯具ユニット
JP5069985B2 (ja) * 2007-09-13 2012-11-07 株式会社小糸製作所 車両用前照灯の灯具ユニットおよび車両用前照灯
JP5425184B2 (ja) * 2008-04-25 2014-02-26 コーニンクレッカ フィリップス エヌ ヴェ ランプ組立体
US20100246203A1 (en) * 2009-03-27 2010-09-30 North American Lighting, Inc. System and method for exterior lighting of vehicles
FR2943799B1 (fr) * 2009-03-31 2011-09-02 Valeo Vision Sas "lentille pour module d'eclairage pour vehicule automobile".
FR2948439B1 (fr) * 2009-07-21 2011-08-05 Valeo Vision Module d'eclairage pour projecteur de vehicule automobile, et projecteur equipe d'au moins un tel module.
JP5442463B2 (ja) * 2010-01-12 2014-03-12 株式会社小糸製作所 車両用ヘッドランプ
JP2011238497A (ja) * 2010-05-12 2011-11-24 Stanley Electric Co Ltd Ｌｅｄ光源ユニットを用いた灯具
JP5640306B2 (ja) * 2011-03-14 2014-12-17 スタンレー電気株式会社 灯具ユニット
EP2500628B1 (en) * 2011-03-14 2020-05-06 Stanley Electric Co., Ltd. Vehicle headlamp

Non-Patent Citations (1)

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Title
None *

Also Published As

Publication number Publication date
EP2730838A1 (fr) 2014-05-14
FR2998036B1 (fr) 2015-05-01
JP6309246B2 (ja) 2018-04-11
JP2014096368A (ja) 2014-05-22
FR2998036A1 (fr) 2014-05-16

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