EP2770248A1 - Fahrzeugscheinwerferlinse - Google Patents

Fahrzeugscheinwerferlinse Download PDF

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Publication number
EP2770248A1
EP2770248A1 EP14155391.7A EP14155391A EP2770248A1 EP 2770248 A1 EP2770248 A1 EP 2770248A1 EP 14155391 A EP14155391 A EP 14155391A EP 2770248 A1 EP2770248 A1 EP 2770248A1
Authority
EP
European Patent Office
Prior art keywords
lens
light
focus
diopter
light beam
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Withdrawn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
EP14155391.7A
Other languages
English (en)
French (fr)
Inventor
Jean-Luc Meyrenaud
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 EP2770248A1 publication Critical patent/EP2770248A1/de
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/25—Projection lenses
    • F21S41/27—Thick 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
    • F21S41/10—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

Definitions

  • the invention particularly relates to a lens, in particular for an optical unit of a lighting and / or signaling device of a motor vehicle.
  • a disadvantage of the lens of this type of unit is that it allows to produce only part of this regulatory photometric function. Therefore, in order to achieve the entire photometric function to comply with the regulations, it is necessary to accumulate several of these lenses.
  • the invention aims in particular to meet the aforementioned need.
  • width of a light beam is meant the width of the spot formed by the projection of this beam on a vertical screen, this width being measured along a horizontal line.
  • the upper part of the lens is capable of producing a first light beam that meets the width criteria defined by the regulations while the lower part of the lens is capable of producing a second light beam entirely dedicated to the light. other criteria.
  • the light beam formed by the first and second beams thus performs the entire photometric function.
  • the upper focus is confused with the lower focus.
  • the upper focus is located in the vicinity of the input diopter of the lens.
  • the upper focus is located substantially on the input diopter of the lens.
  • the lens has an optical axis, the upper focus being located substantially at the intersection of the optical axis of the lens and the input diopter of the lens.
  • the upper portion of the output diopter is cylindrical.
  • the upper portion has an upper generatrix, the upper generatrix being an ellipse portion of which one of the foci is coincident with said upper focus.
  • the upper portion has an upper director, this upper director being a conical having at least one focus, this focus being chosen to obtain a predetermined width of the first light beam.
  • This characteristic has the advantage of being able to spread the first beam laterally homogeneously, that is to say without abrupt change of intensity horizontally, so as to improve the visual comfort of the driver of the vehicle.
  • the width of the first light beam is a function, at least in part, of the position of the focus of the conical and / or its eccentricity.
  • the focus of the upper director may be disposed on the optical axis of the lens.
  • the headmistress is a portion of a circle.
  • the upper director is an ellipse portion.
  • the upper director is a parabola portion.
  • the lower portion of the output diopter is cylindrical.
  • the lower portion has a lower generatrix, this lower generatrix being an ellipse portion of which one of the foci is coincident with said lower focus.
  • the foci of the upper and lower generators are merged. In this way, the rays that leave the lens are, in a vertical plane, parallel to each other.
  • the lower portion has a lower directrix, this lower directrix being a conical having at least one focus, this focus being chosen so as to obtain a given width of the second light beam.
  • the focus of the lower directrix may be disposed on the optical axis of the lens.
  • the lower director is a portion of a circle.
  • the lower directrix is an ellipse portion.
  • the lower director is a parabola portion.
  • the focus of the lower directrix is disposed in front of the focus of the upper director along the optical axis of the lens.
  • the upper director is disposed forward of the lower direction along the optical axis.
  • the upper and lower guidelines are tangent to a single tangent point. This feature makes it possible to simply design the output diopter of the lens. Where appropriate, the single tangent point may be located at the intersection of the optical axis and the exit diopter of the lens.
  • the upper portion extends entirely above the optical axis and the lower portion extends entirely below the optical axis.
  • the output diopter comprises a junction portion joining the upper portion and the lower portion.
  • the joining portion is optically inactive. This characteristic has the advantage of preventing light rays passing through this portion from leaving the lens in an undesired direction and thus parasitizing the light beam produced by the lens.
  • the joining portion makes a recess between the upper portion and the lower portion.
  • the joining portion is flat.
  • the input diopter being plane
  • the junction portion can be integrally contained in a plane perpendicular to the input diopter and containing the optical axis.
  • the junction portion may be arranged so that the exit diopter is smooth.
  • the junction portion can be arranged in such a way that the exit diopter is free of roughness.
  • it may be provided a first surface continuity between the upper portion and the junction portion and a second surface continuity between the joining portion and the lower portion. It is thus possible to make a lens that meets particular aesthetic criteria.
  • the lens comprises, between the input diopter and the output diopter, a side face, preferably arranged to contain the entire emission cone formed by the light rays emitted by the source of light and propagating in the lens.
  • the lateral face has a substantially divergent shape towards the exit diopter of the lens.
  • the lens is made integrally in one piece.
  • the unit is devoid of a reflector, in particular of ellipsoid-shaped reflector, associated with the light source. This offers the advantage of improving the luminous efficiency, compactness and simplicity of the unit.
  • the light source comprises at least one LED, monochip or multichip.
  • the unit comprises at least one cover for concealing light from the source and disposed between the source and the input diopter of the lens.
  • the cache has at least one cutoff edge.
  • cutting edge of the cover is meant at least one edge of the mask arranged to produce a cut-off in a light beam produced by the unit, in particular only in the second light beam produced by the lower portion of the exit diopter of the lens. If necessary, it can be expected that the cutoff edge of the cache passes through the upper focus of the lens, the cache extending below this cutoff edge.
  • the cover can be attached to the input diopter of the lens, that is to say the cover can be for example in contact with the input diopter of the lens. This allows almost all of the light flux emitted by the light source and which is not intercepted by the cover to pass through the input diopter of the lens, which provides excellent light output.
  • the second light beam coming from the lower portion of the exit diopter of the lens has a cutoff, this cut having two portions inclined with respect to each other, in particular making a angle of 15 ° between them.
  • the first light beam from the upper portion of the exit diopter of the lens has a flat cut.
  • the invention also relates to a lighting and / or signaling device comprising an optical unit according to the invention.
  • This optical unit 1 comprises a lens 2 having an optical axis X.
  • the lens 2 comprises a light input diopter 3, a light output diopter 4 and a lateral surface 5 between these diopters 3 and 4.
  • the light exit diopter 4 comprises an upper portion 6 having an upper focus f1, a lower portion 7 having a lower focus f2 coincides with the upper focus f1 and a connecting portion 8 joining the upper portion 6 and the lower portion 7.
  • the upper focus f1 is located substantially in the vicinity of the intersection of the optical axis X of the lens 2 and the input diopter 3 of the lens.
  • the lens 2 is made integrally in one piece.
  • the optical unit 2 also comprises a light-emitting diode 9 whose photoemitting surface is disposed at the upper focus f1 of the upper portion 6 of the lens 2.
  • the diode 9 is able to emit light towards the input diopter 3.
  • the optical unit 2 further comprises a cover 10 for occulting light from the diode 9.
  • the cover 10 is attached to the input diopter 3 of the lens, that is to say in contact with this input diopter 3.
  • the input diopter 3 of the lens 2 is plane and extends entirely in front of the light emitting surface of the diode 9.
  • the lateral surface 5 has a substantially divergent shape towards the exit diopter 4 of the lens 2 so as to contain the entire emission cone formed by the light rays emitted by the diode 9 and propagating in the lens 2.
  • the upper portion 6 of the exit diopter 4 is cylindrical.
  • cylinder is meant the surface generated by a curve called generatrix moving along a curve called directrix and keeping a fixed direction.
  • the upper portion 6 has an upper generatrix 11, the upper generatrix 11 being an ellipse portion of which one of the foci is coincident with said upper focus f1.
  • the lower portion 7 of the exit diopter 4 is cylindrical.
  • the lower portion 7 has a lower generatrix 12, this lower generatrix 12 being an ellipse portion of which one of the foci is coincident with said upper focus f2.
  • the upper portion 6 has an upper director 13, this upper director 13 being an arc having a center c disposed on the optical axis X of the lens 2.
  • the lower portion 7 has a lower guide 14, this lower guide 14 being an ellipse portion having a focus f3 disposed on the optical axis X of the lens 2.
  • the focus f3 of the lower directrix 14 is disposed forward of the center c of the upper director 13 along the optical axis X of the lens.
  • the upper director 13 is disposed in front of the lower director 14 along the optical axis.
  • the upper and lower directions 13 and 14 are tangent at a single tangent point 15 located at the intersection of the optical axis X and the exit diopter 4 of the lens 2.
  • the joining portion 8 makes a recess between the upper portion 6 and the lower portion 7.
  • junction portion 8 is flat and integrally contained in a plane perpendicular to the input diopter 3 and containing the optical axis X.
  • the cover 10 has at least one cutting edge 16 formed by two contiguous ridges 17 and 18 forming between them an angle of 15 °.
  • the set of light r1 coming out through the upper portion 6 form a first light beam 19.
  • the first light beam 19 has a predetermined width L1.
  • the first light beam 19 meets the width criteria defined by the R112 or R123 regulations.
  • Light rays r2 emitted by the diode through the input diopter 3 propagate in the lens 2 and exit through the lower portion 7 to a vertical screen E.
  • All the light rays r2 coming out of the lower portion 7 form a second light beam 20.
  • the second light beam 20 has a predetermined width L2.
  • the width L1 of the first light beam 19 is greater than the width L2 of the second light beam.
  • the second light beam 20 has a cut 21, this cut 21 having two portions 22 and 23 inclined relative to each other.
  • the light beam 24 thus achieves the totality of a regulatory photometric function of crossing lighting.

Landscapes

  • 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)
EP14155391.7A 2013-02-21 2014-02-17 Fahrzeugscheinwerferlinse Withdrawn EP2770248A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1351475A FR3002304A1 (fr) 2013-02-21 2013-02-21 Lentille, notamment pour une unite optique

Publications (1)

Publication Number Publication Date
EP2770248A1 true EP2770248A1 (de) 2014-08-27

Family

ID=48170739

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14155391.7A Withdrawn EP2770248A1 (de) 2013-02-21 2014-02-17 Fahrzeugscheinwerferlinse

Country Status (2)

Country Link
EP (1) EP2770248A1 (de)
FR (1) FR3002304A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3025865A1 (fr) * 2014-09-16 2016-03-18 Valeo Vision Dispositif d'eclairage d'un vehicule utilisant une lentille optique multisource
WO2020212191A1 (fr) * 2019-04-19 2020-10-22 Valeo Vision Systeme optique

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0623780A2 (de) * 1993-05-03 1994-11-09 Zizala Lichtsysteme GmbH Fahrzeugscheinwerferprojektionslinse
DE102008045765A1 (de) * 2008-09-04 2010-03-11 Hella Kgaa Hueck & Co. Scheinwerfer für Kraftfahrzeuge
US20110080744A1 (en) * 2008-05-01 2011-04-07 Magna International Inc. Hotspot cutoff d-optic
EP2525142A2 (de) 2011-05-17 2012-11-21 Valeo Vision Optische Einheit, insbesondere für Kraftfahrzeug

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0623780A2 (de) * 1993-05-03 1994-11-09 Zizala Lichtsysteme GmbH Fahrzeugscheinwerferprojektionslinse
US20110080744A1 (en) * 2008-05-01 2011-04-07 Magna International Inc. Hotspot cutoff d-optic
DE102008045765A1 (de) * 2008-09-04 2010-03-11 Hella Kgaa Hueck & Co. Scheinwerfer für Kraftfahrzeuge
EP2525142A2 (de) 2011-05-17 2012-11-21 Valeo Vision Optische Einheit, insbesondere für Kraftfahrzeug

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3025865A1 (fr) * 2014-09-16 2016-03-18 Valeo Vision Dispositif d'eclairage d'un vehicule utilisant une lentille optique multisource
EP2998645A3 (de) * 2014-09-16 2016-06-15 Valeo Vision Beleuchtungsvorrichtung eines fahrzeugs, die eine optische linse mit mehreren quellen verwendet
US9879838B2 (en) 2014-09-16 2018-01-30 Valeo Vision Vehicle lighting device using a multiple-source optical lens
WO2020212191A1 (fr) * 2019-04-19 2020-10-22 Valeo Vision Systeme optique
FR3095280A1 (fr) * 2019-04-19 2020-10-23 Valeo Vision Systeme optique
JP2022529278A (ja) * 2019-04-19 2022-06-20 ヴァレオ ビジョン 光学装置
US11644168B2 (en) 2019-04-19 2023-05-09 Valeo Vision Optical system

Also Published As

Publication number Publication date
FR3002304A1 (fr) 2014-08-22

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