EP2680047A1 - Herstellungsverfahren einer Linse für optisches Modul eines Kraftfahrzeugs - Google Patents

Herstellungsverfahren einer Linse für optisches Modul eines Kraftfahrzeugs Download PDF

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Publication number
EP2680047A1
EP2680047A1 EP13169097.6A EP13169097A EP2680047A1 EP 2680047 A1 EP2680047 A1 EP 2680047A1 EP 13169097 A EP13169097 A EP 13169097A EP 2680047 A1 EP2680047 A1 EP 2680047A1
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EP
European Patent Office
Prior art keywords
lens
mesh
unevennesses
exit surface
unevenness
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Withdrawn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
EP13169097.6A
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English (en)
French (fr)
Inventor
Antoine De Lamberterie
Julien Muller
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
Original Assignee
Valeo Vision SAS
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 Valeo Vision SAS filed Critical Valeo Vision SAS
Publication of EP2680047A1 publication Critical patent/EP2680047A1/de
Withdrawn legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/20—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
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights

Definitions

  • the invention relates to a method for manufacturing a lens for a motor vehicle optical module, in particular for generating a line of cutoff of the optical beam of a satisfactory sharpness.
  • Such means typically consist of caches in the focal plane of the lens of the elliptical module, or reflecting surfaces called folders.
  • Such lighting modules are related to lighting lights such as code lights, high beam, fog lamps, adaptive beams better known by the acronym “ADB” for the expression Anglo-Saxon “ Adaptive Driving Beam”, lights for driving on the highway, also known as the “Motorway”, and generally all lighting beams that have a cut.
  • ADB adaptive beams better known by the acronym “ADB” for the expression Anglo-Saxon “ Adaptive Driving Beam”
  • lights for driving on the highway also known as the “Motorway”
  • Motorway generally all lighting beams that have a cut.
  • the generated beam then has a cutoff line of its brightness which can be problematic.
  • the beam forms an area of high contrast between, on either side of the cut line, a portion of the illuminated road and part of the road kept dark.
  • this contrast zone may cause discomfort for the driver of the vehicle emitting the cutoff beam too sharp. Indeed, this area sweeps the road with the movements of the vehicle that changes its attitude relative to the ground while traveling, which amplifies the inconvenience caused by the contrast.
  • the patent application FR 2 925 656 discloses such a lens where the microstructures are presented as hollows and bumps arranged either randomly (sanding) or in the form of a relatively regular network to the exit surface of the lens.
  • the document FR 2 931 251 discloses a lens for an elliptical automobile projector module, in which optical diffusion effect zones, subdivided into a periodic frame of individual cells, which respectively have a structural element, which causes, respectively, are formed on a surface of the lens; a targeted diffusion of light.
  • the microstructure profile is sinusoidal. Although this profile is simple to achieve, it nevertheless has the disadvantage of shifting the position of the maximum contrast that characterizes the position of the cut with respect to the remainder of the beam, or even to generate a second cut of the beam, resulting in a ambiguity in the setting which is very troublesome vis-à-vis compliance with regulatory standards, the double cut causing further degradation of the scope of the beam.
  • the present invention results from the observation that such manufacturing processes and the lenses thus manufactured do not make it possible to effectively control the scattering of light above the cutoff threshold.
  • such lenses have microstructures whose profiles are relatively random and, consequently, whose optical diffusion is difficult to control.
  • the chromatic properties of the generated beam even though, according to an observation peculiar to the invention, the rays diffused by the central part of a lens are more interesting to diffuse. above the cutoff line as the rays scattered by the periphery of the lens. As a result, the latter exhibit a more marked chromatic (color iridescence) phenomenon and thus less participate in white light scattering.
  • the method comprises the additional step of generating secondary elevations located between different meshes.
  • Such a method has many advantages.
  • it has the advantage of using a mesh of the exit surface of the lens so that each microstructure can be considered, at its mesh, independently of others.
  • it is possible to define microstructure profiles specific to each mesh according to its position in the mesh.
  • this same method can be applied to different lenses so as to generate different levels of sharpness cut line specific to each lens.
  • it is sufficient to associate a distinct profile of unevenness or secondary unevenness with each lens to obtain a specific level of sharpness.
  • the method comprises the step of generating the unevenness or the secondary unevenness of the microstructures such that each secondary elevation or unevenness has an axis of symmetry, for example an axis of revolution or an axis of rotation.
  • the contour of the drop or the secondary drop in a plane perpendicular to the axis of symmetry is circular or elliptical, the latter variant allowing in particular to have a variable profile in different directions so that the diffusion by the microstructures can be adjusted independently in these different directions.
  • the axis of symmetry of each drop or each secondary drop is parallel to an axis normal to the output surface of the lens and / or to an optical axis of the lens at the mesh.
  • the profile of each elevation or of each secondary elevation is predetermined according to the distance from its mesh to a central portion of the lens so that at least one same dimension, for example For example, a depth or height and / or an opening that can correspond to a diameter, decreases with this distance decreases.
  • edges of the unevenness or secondary unevenness are located, in the mesh, at the exit surface of the lens.
  • the profile of the vertical drop or the secondary unevenness is predetermined by means of a mathematical modeling of its surface, typically a polynomial modeling which allows a better control of the cut which makes it possible in particular to limit the shift of the maximum of contrast. or even avoid creating a double break.
  • the secondary elevations or unevenness can be constituted by recesses, reliefs, or a combination of recesses and reliefs.
  • the surface of the unevenness or secondary unevenness is continuous, so as not to show any jump or discontinuity of these unevennesses.
  • the surface of the unevenness or secondary unevenness is continuously differentiable, so as not to have angular points.
  • FIG. 1 With reference to the figure 1 is shown a first step of a method of manufacturing a lens 100 for a motor vehicle lighting module according to the invention.
  • a mesh (or network) 102 is formed on the exit surface 104 of this lens 100, also called a carrier, such that each of its meshes 106 has similar dimensions.
  • meshes have similar dimensions when their surfaces do not differ by a multiplicative factor greater than 10.
  • such a mesh 102 is performed by means of a Cartesian coordinate system (O, x, y, z) making it possible to define parallel or perpendicular segments by varying the horizontal (Ox) or vertical (Oz) coordinates at the surface 104 of the lens, that is to say with a zero value along the axis (Oy).
  • the mesh 102 is presented as a grid where each mesh 106 corresponds to a substantially square shaped tile.
  • a radial mesh 202 is being formed by means of polar coordinates using a mark (O, r, a) where O corresponds to a center of the surface 100, r the distance (or radius) of a Ring of thickness dr located around a center O and cut into patterns delimited, on the one hand, by the borders of the ring and, on the other hand, by two spokes forming an angle a.
  • O corresponds to a center of the surface 100
  • r the distance (or radius) of a Ring of thickness dr located around a center O and cut into patterns delimited, on the one hand, by the borders of the ring and, on the other hand, by two spokes forming an angle a.
  • meshes 206 forming concentric rings vis-à-vis the center O of the lens.
  • the lens 100 has a three-dimensional curved surface such as a spherical surface, or even a complex shape not having a geometric center O.
  • the mesh 102 or 202 is then formed by projecting on the surface 100 to three dimensions a mesh 102 or 202 formed as described above, at the optical path followed by a beam transmitted by the lens.
  • the method of manufacturing the lens comprises the step of forming, in each mesh 106 or 206, a microstructure generated by a recess of material, also called sink or cavity, according to a predetermined profile. depending on the position of the mesh in the mesh.
  • a recess 108 may be formed to have a symmetry of revolution about a central axis 114 located simultaneously at the center of the contour of the recess 108 and the tile 106.
  • the profiles horizontal recess 110 (x, y) or vertical 112 (y, z) are identical.
  • the recess 108 then has a circular contour in each plane perpendicular to the axis 114, including at the outlet surface where the edges 117 of the recess in the mesh are located, these edges 117 being at the level of the exit surface of the lens (carrier).
  • a recess 108 ' may also be formed in a rectangular mesh 106' having rotation symmetry about the central axis 114 '.
  • the profiles of the horizontal recess 110 '(x, y) or vertical 112' (y, z) are distinct.
  • the recess 108 ' has an elliptical contour in each plane perpendicular to the axis 114.
  • the predetermined profile is a function of the distance from the mesh to the center of the lens.
  • this profile is also a function of the height of the mesh on the lens.
  • the amplitude of the profile increases as one approaches a central line of the lens.
  • a secondary microstructure 508 is formed by a recess located between the microstructures 108 formed as previously described in their respective meshs 106.
  • this secondary recess 508 is tangent to the main recesses 108 so as to maintain a symmetry of the occupation of the surface 102 by recesses while increasing the area dedicated to these recesses at the level of the carrier.
  • This embodiment increases the light diffusion and reduces the sharpness of the beam cutoff.
  • the radius of such a microstructure corresponds to the distance between a corner of the pattern and the edge of the circle along the diagonal.
  • the profile of the recess can be predetermined by means of a mathematical modeling of its surface, for example a polynomial function which makes it possible to modify coefficients of this polynomial function in order to test different profiles on the same type of lens.
  • the present invention is capable of many variants.
  • the tiles may be square, rectangular or of any other form making it possible to perform a satisfactory mesh of the surface.
  • the unevenness and the secondary unevenness have been described as recesses or depressions. The same characteristics and the same advantages can be obtained with unevenness or secondary unevenness in the form of reliefs or bumps.
  • the same lens may include these two kinds of unevenness, some of the unevenness being bumps, others are hollow. Similarly some of the secondary unevenness may be bumps, others are hollow.
EP13169097.6A 2012-06-27 2013-05-24 Herstellungsverfahren einer Linse für optisches Modul eines Kraftfahrzeugs Withdrawn EP2680047A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1256092A FR2992737B1 (fr) 2012-06-27 2012-06-27 Procede de fabrication d'une lentille pour module optique de vehicule automobile

Publications (1)

Publication Number Publication Date
EP2680047A1 true EP2680047A1 (de) 2014-01-01

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EP13169097.6A Withdrawn EP2680047A1 (de) 2012-06-27 2013-05-24 Herstellungsverfahren einer Linse für optisches Modul eines Kraftfahrzeugs

Country Status (3)

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US (1) US9109770B2 (de)
EP (1) EP2680047A1 (de)
FR (1) FR2992737B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015031925A1 (de) * 2013-09-03 2015-03-12 Zizala Lichtsysteme Gmbh Optische struktur mit einer mikrostruktur mit quadratischer streufunktion
EP3671304A1 (de) 2018-12-19 2020-06-24 Automotive Lighting Reutlingen GmbH Verfahren zur konstruktion eines optischen elements für einen kraftfahrzeugscheinwerfer

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3048485B1 (fr) * 2016-03-02 2019-04-05 Valeo Vision Lentille amelioree pour dispositif d'eclairage de vehicule automobile

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2925656A1 (fr) 2007-12-21 2009-06-26 Holophane Soc Par Actions Simp Lentille de module d'eclairage de vehicule automobile
FR2931251A1 (fr) 2008-05-14 2009-11-20 Automotive Lighting Reutlingen Lentille optique a des fins d'eclairage et dispositif d'eclairage ayant cette lentille.

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2925656A1 (fr) 2007-12-21 2009-06-26 Holophane Soc Par Actions Simp Lentille de module d'eclairage de vehicule automobile
FR2931251A1 (fr) 2008-05-14 2009-11-20 Automotive Lighting Reutlingen Lentille optique a des fins d'eclairage et dispositif d'eclairage ayant cette lentille.

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015031925A1 (de) * 2013-09-03 2015-03-12 Zizala Lichtsysteme Gmbh Optische struktur mit einer mikrostruktur mit quadratischer streufunktion
EP3671304A1 (de) 2018-12-19 2020-06-24 Automotive Lighting Reutlingen GmbH Verfahren zur konstruktion eines optischen elements für einen kraftfahrzeugscheinwerfer
DE102018132866A1 (de) 2018-12-19 2020-06-25 Automotive Lighting Reutlingen Gmbh Verfahren zur Konstruktion eines optischen Elements für einen Kraftfahrzeugscheinwerfer

Also Published As

Publication number Publication date
US20140003079A1 (en) 2014-01-02
US9109770B2 (en) 2015-08-18
FR2992737A1 (fr) 2014-01-03
FR2992737B1 (fr) 2015-06-19

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