EP1741976A1 - Phare pour véhicules - Google Patents

Phare pour véhicules Download PDF

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Publication number
EP1741976A1
EP1741976A1 EP06116131A EP06116131A EP1741976A1 EP 1741976 A1 EP1741976 A1 EP 1741976A1 EP 06116131 A EP06116131 A EP 06116131A EP 06116131 A EP06116131 A EP 06116131A EP 1741976 A1 EP1741976 A1 EP 1741976A1
Authority
EP
European Patent Office
Prior art keywords
optical element
plastic optical
temperature
headlamp according
compensation
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
EP06116131A
Other languages
German (de)
English (en)
Other versions
EP1741976B1 (fr
Inventor
Dr. Karsten Eichhorn
Dr. Gerhard Kloos
Stephan Schmidt
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.)
Hella GmbH and Co KGaA
Original Assignee
Hella KGaA Huek and Co
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 Hella KGaA Huek and Co filed Critical Hella KGaA Huek and Co
Publication of EP1741976A1 publication Critical patent/EP1741976A1/fr
Application granted granted Critical
Publication of EP1741976B1 publication Critical patent/EP1741976B1/fr
Anticipated expiration legal-status Critical
Not-in-force 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
    • F21S41/60—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
    • 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]
    • 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
    • F21S41/67—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on reflectors
    • F21S41/675—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on reflectors by moving reflectors
    • 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
    • F21V5/00—Refractors for light sources
    • F21V5/04—Refractors for light sources of lens shape
    • F21V5/045—Refractors for light sources of lens shape the lens having discontinuous faces, e.g. Fresnel lenses
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

Definitions

  • the invention relates to a headlamp for vehicles with a lighting arrangement comprising a light source, light guide means for forwarding the light emitted by the light source and a light guide means downstream plastic optical element for generating a predetermined illumination intensity distribution.
  • a headlamp for vehicles with a lighting arrangement known comprising a light source, a light guide as a light guide means for forwarding the light emitted from the light source and a plastic optical element, which adjoins the light guide means in the light propagation direction.
  • a shading segment is arranged as a light guiding means, which defines with its contour the bright-dark boundary of a given illumination intensity distribution.
  • a fog light function or low beam function can be realized.
  • the known plastic optical element consists of a polycarbonate or an acrylic material. It has been found that undesirable "softening" and / or shifting of the position of the cut-off line occurs under unfavorable temperature conditions.
  • Object of the present invention is therefore to develop a headlamp for vehicles such that an unwanted glare due to an altered cut-off of the illumination intensity distribution is avoided in temperature fluctuations.
  • the invention in conjunction with the preamble of claim 1, characterized in that temperature compensation means are provided, such that the illumination intensity distribution in Range of a predetermined cut-off always runs below a predetermined glare threshold.
  • the particular advantage of the invention is that by providing temperature compensation means in a relatively wide temperature range, a significant bright-dark limit of the illuminance distribution corresponding to the legal requirements is generated.
  • the basic idea of the invention is to provide temperature compensation means which further reduce the temperature sensitivity of the headlamp so that a weight-saving use of plastic optics elements made of a relatively light material is made possible.
  • the temperature compensation means according to the invention it can be ensured that the light-dark boundary of the illuminance distribution always runs below a predetermined glare threshold. A shift in the light-dark boundary of the illumination intensity distribution above a horizontal or a smaller gradient of the light-dark boundary with the effect that more light portions are arranged above the horizontal, can thereby be effectively avoided.
  • a compensating unit may be provided as compensating means which, as a function of the current temperature of the plastic optical element, tracks photometric parameters, such as, for example, the focal length of lenses arranged in the lighting arrangement.
  • photometric parameters such as, for example, the focal length of lenses arranged in the lighting arrangement.
  • the angular position of the plastic optical element or other optical elements (lenses) can be changed so that the illuminance above a horizontal is limited below a glare threshold.
  • the angular position of the entire projection headlamp, that is, including the light source and shader, or the LED module, that is, LED light source (s) and plastic optical element be changed so that the illuminance is limited above a horizontal below a glare threshold ,
  • the plastic optical element is assigned a temperature sensor, which measures the current temperature of the plastic optical element and supplies it to a control unit of the compensation unit, so that the control unit can carry out a correction of the position of the cut-off line by generating control variables.
  • a heating / cooling unit can be provided as compensating means, which ensures that the plastic optical element always lies in a designated temperature range.
  • a design state of the plastic optical element is thereby maintained, so that further compensation measures are not required.
  • the plastic optical element thus always has the same refractive properties regardless of the environmental conditions.
  • the shape of the plastic optics can be designed such that the lighting arrangement is robust with respect to the change of the refractive index with the temperature.
  • a compensation optics having at least two lens elements.
  • the shape and / or the material of the lens elements is chosen such that a temperature compensation of the plastic optical element takes place.
  • the compensation optics contains the plastic optical element and allows a relatively robust compensation of the disturbing temperature influence by the material of the plastic optical element.
  • the plastic optical element is formed from a transparent polymer whose refractive index is always less than or equal to a threshold value with respect to the temperature.
  • a threshold value with respect to the temperature.
  • An inventive headlight for motor vehicles consists of a housing, not shown, in which a lighting arrangement is arranged.
  • the lighting arrangement can operate on the projection principle, in a first focal point f 1 of a reflector 1, a light source 2 is arranged.
  • a second focal point f 2 of the reflector 1 an opaque shading surface 5 is arranged, the contour of which is imaged by means of a lens-shaped plastic optical element 4 at a light-dark boundary of a predetermined illuminance distribution.
  • the lens-shaped plastic optical element 4 may in particular be a Fresnel lens.
  • a light source 2 in this working according to the projection photometric arrangement can serve in particular a gas discharge lamp.
  • an LED or an arrangement of several LEDs can be used as the light source.
  • the lighting arrangement can also be designed such that the edge to be imaged, which serves to generate a cut-off line of a given illumination intensity distribution, is located behind or in the light propagation direction behind an LED or an arrangement of LEDs.
  • the image is taken in this case by means of a lens-shaped designed plastic optical element, the light output surface is formed arcuate in the vertical direction.
  • a dazzling threshold B In unfavorable ambient temperatures of the plastic optical element 4 - such as 100 ° C - exceeds a illuminance curve 100 in the light-dark boundary HDG a dazzling threshold B. This results in an undesirable glare of oncoming traffic through the headlamp, if measures according to the invention are not provided.
  • the glare threshold B for example, the ECE Regulation No. 98 are used, which stipulates that the cut-off light limit HDG of a low beam headlamp must not migrate more than 0.057 ° with temperature changes.
  • the glare threshold B can be specified by the criterion that an illuminance of 1 LUX may not be exceeded at the crossing point of the horizontal and vertical.
  • a compensation unit 12 is provided according to a first embodiment of the invention as a temperature compensation means which changes the position of the plastic optical element 4 in dependence on the current temperature of the plastic optical element 4 so that the glare threshold B is not exceeded.
  • the compensation unit 12 has a temperature sensor 13, which is arranged in the vicinity of the plastic optical element 4 and measures the current temperature of the plastic optical element 4.
  • the compensation unit 12 has an electronic control unit 14 which continuously receives the sensor signal of the temperature sensor 13 and processes it by means of a compensation program in such a way that a control signal 15 is output to a mechanical control unit 16 when a predefined threshold value is reached.
  • the actuating signal 15 causes the setting unit 16 to swivel the plastic optical element 4 about a given angle 17 about a horizontal axis, so that the light-dark boundary (HDG) is displaced downwards in the vertical direction (arrow direction 18) ) that glare can not occur.
  • the electronic control unit 14 has a temperature compensation program, according to which an angle adjustment of the headlight or of the plastic optical element 4 is made as a function of the current ambient temperature.
  • a housing 20 of the headlamp can be pivoted about a horizontal axis depending on temperature.
  • the same components of the embodiment of Figure 2 and according to the figure 3 are provided with the same reference numerals.
  • the entire unit consisting of the reflector 1, the light source 2, the diaphragm 5 and the lens 4 is pivoted by a predetermined tilt angle 17.
  • a compensation unit 21 differs from the compensation unit 12 according to the embodiment of FIG. 2 in that the actuating signal 15 acts on a mechanical actuating unit, not shown, which pivots the housing 20 of the headlight about a horizontal axis.
  • a tracking along an optical axis 19 or a tracking transversely to the optical axis 19 can take place.
  • a tracking of the shadow of a projection system can be carried out perpendicular to the optical axis.
  • other primary optics elements or secondary optics elements of the lighting arrangement can be tracked with respect to the angular position thereof or the focal length of the lighting arrangement. It is essential that a compensation of the refractive property of the plastic optical element 4 takes place at high temperature changes.
  • the plastic optical element 4 may be alternatively or additionally associated with a heating / cooling unit, by means of which the temperature is maintained in the vicinity of the plastic optical element 4 within a predetermined temperature range.
  • a heating or cooling device can be activated, so that exceeding a maximum ambient temperature and thus an inadmissible refractive power of the plastic optical element 4 is avoided.
  • the plastic optical element 4 is designed in its shape such that the values of the illuminance distribution in the region of the cut-off line remain within a predetermined operating temperature range below a predetermined glare threshold.
  • the plastic optical element 4 is designed for an average operating temperature, so that an exceeding of the glare threshold occurs only in exceptional situations.
  • the desired design temperature may be, for example, 80 ° C.
  • the plastic optical element 4 is made of a plastic material, such as PMMA.
  • the plastic optical element 4 allows for a designed ambient temperature of 20 ° C, a relatively sharp cut-off line HDG.
  • the gradient 20 of the illuminance in the region of the horizontal of the illuminance distribution is relatively large. The increased robustness of the lighting arrangement relative to the influence of temperature on the refractive index due to a suitable optical design of the plastic optical element is characterized.
  • compensation optics comprising at least two lens elements may be provided as compensating means, wherein the refractive indices of the lens elements are selected such that a mathematical temperature compensation formula is fulfilled.
  • a and B represent the two lens elements
  • P A and P B are the refractive power
  • n A and n B are the refractive index
  • ⁇ A and ⁇ B are the coefficient of expansion of the lens elements A and B.
  • one lens A must be formed as a convex lens and the other lens B as a concave lens in order to satisfy the aforementioned temperature compensation formula.
  • one of the two lens elements A, B may be formed by the plastic optical element 4. Since the lens elements A and B are made of a plastic material, there is no significant increase in the weight of the headlamp.
  • the plastic optical element is formed from a transparent polymer whose refractive index with respect to the temperature is less than or equal to -0.7 * 10 -4 (1 / K).

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)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)
EP06116131.1A 2005-07-07 2006-06-27 Phare pour véhicules Not-in-force EP1741976B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102005031776A DE102005031776A1 (de) 2005-07-07 2005-07-07 Scheinwerfer für Fahrzeuge

Publications (2)

Publication Number Publication Date
EP1741976A1 true EP1741976A1 (fr) 2007-01-10
EP1741976B1 EP1741976B1 (fr) 2016-10-26

Family

ID=37084629

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06116131.1A Not-in-force EP1741976B1 (fr) 2005-07-07 2006-06-27 Phare pour véhicules

Country Status (2)

Country Link
EP (1) EP1741976B1 (fr)
DE (1) DE102005031776A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007028630A1 (de) 2007-06-21 2008-12-24 Hella Kgaa Hueck & Co. Scheinwerfer für Fahrzeuge
CN101510962B (zh) * 2008-12-31 2012-03-21 昆山锐芯微电子有限公司 透镜阴影校正方法和装置
CN103032797A (zh) * 2012-12-24 2013-04-10 浙江奥龙汽车配件有限公司 一种摩托车专用带凸镜氙气灯
DE102012022524A1 (de) 2012-11-16 2014-05-22 Hella Kgaa Hueck & Co. Lichtmodul für einen Scheinwerfer eines Fahrzeugs
CN108469005A (zh) * 2018-03-01 2018-08-31 宁波众心电子科技有限公司 一种自适应摩托车车头灯及其控制系统、控制方法

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008003706A1 (de) * 2008-01-09 2009-07-16 Hella Kgaa Hueck & Co. Scheinwerferanordnung mit einer Temperaturkompensation der Abstrahlrichtung des Abblendlichtes
EP2159478B1 (fr) 2008-08-26 2012-10-03 Hella KGaA Hueck & Co. Phare pour véhicules
DE102011087306A1 (de) * 2011-11-29 2013-05-29 Osram Gmbh Fahrzeugbeleuchtungsvorrichtung
DE102012219707B4 (de) 2012-07-12 2024-12-05 Automotive Lighting Reutlingen Gmbh Verfahren zur Steuerung des Lichtmoduls eines Kraftfahrzeugscheinwerfers, Steuergerät und Scheinwerfer
DE102022115511A1 (de) 2022-06-22 2023-12-28 Marelli Automotive Lighting Reutlingen (Germany) GmbH Beleuchtungseinrichtung für ein Kraftfahrzeug mit einer hochauflösenden Lichtquelle und temperaturkompensierter Symboldarstellung

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0737600A2 (fr) * 1995-04-10 1996-10-16 Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 Dispositif de réglage de la porte des phares d'un véhicule
DE10057367A1 (de) * 2000-11-18 2002-05-23 Bayerische Motoren Werke Ag Steuerungsvorrichtung zur Einstellung der Lichtverteilung bei einem Fahrzeug
DE102004008063A1 (de) * 2004-02-19 2005-09-08 Automotive Lighting Reutlingen Gmbh Verfahren zum Ansteuern eines elektrischen Schrittmotors zur Variation der Charakteristik eines von einem Kraftfahrzeugscheinwerfer ausgesandten Lichtbündels

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11321440A (ja) * 1998-05-18 1999-11-24 Koito Mfg Co Ltd 車輌用灯具装置
JP4130345B2 (ja) * 2002-09-20 2008-08-06 株式会社小糸製作所 車両用前照灯装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0737600A2 (fr) * 1995-04-10 1996-10-16 Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 Dispositif de réglage de la porte des phares d'un véhicule
DE10057367A1 (de) * 2000-11-18 2002-05-23 Bayerische Motoren Werke Ag Steuerungsvorrichtung zur Einstellung der Lichtverteilung bei einem Fahrzeug
DE102004008063A1 (de) * 2004-02-19 2005-09-08 Automotive Lighting Reutlingen Gmbh Verfahren zum Ansteuern eines elektrischen Schrittmotors zur Variation der Charakteristik eines von einem Kraftfahrzeugscheinwerfer ausgesandten Lichtbündels

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007028630A1 (de) 2007-06-21 2008-12-24 Hella Kgaa Hueck & Co. Scheinwerfer für Fahrzeuge
CN101510962B (zh) * 2008-12-31 2012-03-21 昆山锐芯微电子有限公司 透镜阴影校正方法和装置
DE102012022524A1 (de) 2012-11-16 2014-05-22 Hella Kgaa Hueck & Co. Lichtmodul für einen Scheinwerfer eines Fahrzeugs
CN103032797A (zh) * 2012-12-24 2013-04-10 浙江奥龙汽车配件有限公司 一种摩托车专用带凸镜氙气灯
CN103032797B (zh) * 2012-12-24 2015-01-07 浙江奥龙汽车配件有限公司 一种摩托车专用带凸镜氙气灯
CN108469005A (zh) * 2018-03-01 2018-08-31 宁波众心电子科技有限公司 一种自适应摩托车车头灯及其控制系统、控制方法

Also Published As

Publication number Publication date
EP1741976B1 (fr) 2016-10-26
DE102005031776A1 (de) 2007-01-18

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