EP2159478A1 - Phare pour véhicules - Google Patents

Phare pour véhicules Download PDF

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Publication number
EP2159478A1
EP2159478A1 EP08105129A EP08105129A EP2159478A1 EP 2159478 A1 EP2159478 A1 EP 2159478A1 EP 08105129 A EP08105129 A EP 08105129A EP 08105129 A EP08105129 A EP 08105129A EP 2159478 A1 EP2159478 A1 EP 2159478A1
Authority
EP
European Patent Office
Prior art keywords
lens
optical element
light
optical axis
shaped optical
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
EP08105129A
Other languages
German (de)
English (en)
Other versions
EP2159478B1 (fr
Inventor
Susanne Hagedorn
Andreas Stockfisch
Uwe Haack
Harald Zerhau-Dreihöfer
Klaus Streich-Schulz
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
Priority to EP08105129A priority Critical patent/EP2159478B1/fr
Publication of EP2159478A1 publication Critical patent/EP2159478A1/fr
Application granted granted Critical
Publication of EP2159478B1 publication Critical patent/EP2159478B1/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
    • 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
    • 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
    • F21S41/10—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
    • F21S41/20—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
    • F21S41/40—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by screens, non-reflecting members, light-shielding members or fixed shades
    • 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
    • F21W2102/135—Arrangement or contour of the emitted light for high-beam region or low-beam region the light having cut-off lines, i.e. clear borderlines between emitted regions and dark regions
    • F21W2102/14—Arrangement or contour of the emitted light for high-beam region or low-beam region the light having cut-off lines, i.e. clear borderlines between emitted regions and dark regions having vertical cut-off lines; specially adapted for adaptive high beams, i.e. wherein the beam is broader but avoids glaring other road users
    • 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 at least one light source and a light guide unit for generating a predetermined light distribution with a light-dark boundary, wherein the light guide unit comprises a lens-shaped optical element, on which on a side facing the light source impinging light rays in one of the edge remote from the optical axis to spectral partial light beams are broken, wherein the spectral partial light rays leave the lenticular optical element in a different refractive angle.
  • a headlamp for vehicles which has on the one hand a light source and on the other a light guide unit for generating a predetermined light distribution with a cut-off line.
  • the light guide unit has a lens-shaped optical element, which is changed in its relative position to the light source as a function of the current temperature such that a legal limit does not exceed the bright-dark boundary is generated. In particular, this can reduce or avoid wavelength and temperature-related shifting of the cut-off line due to dispersion effects.
  • this mechanical and electronic means are required, such as a temperature sensor for determining the current temperature, an actuator for adjusting the lens-shaped optical element and an electronic control unit for determining the travel by which the lens-shaped optical element is adjusted.
  • Object of the present invention is therefore to develop a headlamp for vehicles such that a wavelength and / or temperature-induced shift of the cut-off of a light distribution is reduced or avoided in a simple manner.
  • the invention in conjunction with the preamble of claim 1, characterized in that the lens-shaped optical element is formed such that the refracted above the optical axis in an edge region of the lenticular optic element under a relatively small refractive angle spectral partial light rays have the same focal length like the spectral partial light beams which are refracted below the optical axis in the edge region of the lenticular optical element, a relatively large refraction angle.
  • the particular advantage of the invention is that for the light-dark boundary of a light distribution relevant spectral light beams have a common focal length.
  • temperature-induced dispersion effects can advantageously be reduced or avoided, with a largely color-neutral light-dark boundary being produced.
  • a bright-dark boundary can thus be generated in a fixed position.
  • the basic idea of the invention is to combine such spectral partial light beams refracted at the lenticular optical element in an edge region into a common focal point or three-dimensional view into a common focal line which is at a relatively small refraction angle and below the optical axis in one above the optical axis of the optical element Axis be broken by a relatively large angle of refraction.
  • edge rays of the light beam spectrum which are responsible for the unwanted color fringe effect at the light-dark boundary and determine the position of the light-dark boundary can be brought together.
  • the other partial spectral light beams in the edge region of the lenticular optical element each run in vertical section below the converging spectral partial light beams of different colors.
  • the spectral partial light beams of the upper edge region of the optical element which are refracted at a relatively small refraction angle lie in a red wavelength range.
  • the broken at a relatively large refraction angle in the lower region of the optical element Partial spectral rays are in a blue wavelength range.
  • These red and blue partial light rays form marginal rays of a light beam spectrum, wherein they each form an upper edge ray region of the ray spectrum. This ensures that the relevant marginal rays converge in a common focal point, while the other spectral partial light rays run through a difference angle below the corresponding partial light beams and thus can not contribute to glare.
  • the superposition according to the invention (additive color mixing) of red and blue portions of the light radiation enables an enlargement of the "white” mixing area.
  • the temperature application range of the lens-shaped optical element preferably made of plastic material, in which the light-dark boundary changes within the legal requirements (in particular position and color), thus becomes larger. This also increases the adjustment tolerance or an adjustment can even be avoided if necessary.
  • the lenticular optical element according to the invention can be used on the one hand in a headlamp with an LED light unit as the light source and on the other hand in a projection headlamp, which works with a reflector and an additional aperture on the projection principle.
  • the invention allows a space-saving and simplified design of the headlamp compared to the prior art, whereby undesirable dispersion effects in the headlamp are reduced.
  • An inventive headlamp for motor vehicles may be formed, for example, as a projection headlamp 1, which has a light source 2 and a light guide unit 3 for generating a predetermined light distribution with a light-dark boundary.
  • the light guide unit 3 is formed by a reflector 4 associated with the light source 2, wherein the light source 2 is arranged in a first focal point f 1 of the reflector 4.
  • a diaphragm 5 is arranged, whose contour is imaged by means of a lenticular optical element 6 to a light-dark boundary of the light distribution.
  • the lenticular optical element 6 may be made of a glass or plastic material.
  • a refraction of an upper "white" marginal ray 9 and a lower "white” marginal ray 10 in a marginal area 8 of the optic element 7 leads to a color splitting.
  • the red partial light beams 11 form a focal point f red , which lies in the light emission direction 12 in front of a focal point f of the optical element 7.
  • the blue partial light beams 13 form a focal point f blue , which lies in the light emission direction 12 behind the focal point f of the optical element 7.
  • In the vertical section of the optical element 7 thus creates a focal line between the focal point f red and f blue . This leads to undesirable color effects at the cut-off line or to the unwanted dazzling of other road users.
  • red partial light beams 14 above the optical axis 16 and the blue partial light beams 18 below the optical axis 16 respectively form upper edge beams of a number of partial spectral beams.
  • a blue lower edge beam 21 of the partial light beams refracted above the optical axis 16 intersects the optical axis 16 in a region between the main plane H of the optical element 6 and the focal point f.
  • a lower red marginal ray 22 of the sub-light beams extending below the optical axis 16 intersects the optical axis 16 in a region lying in front of the focal point f in the light emission direction 12.
  • the red partial light beam 14 is refracted at an angle of refraction ⁇ 1 to the light beam 17 towards the optical axis 16.
  • the blue partial light beam 18 is refracted at an angle of refraction ⁇ 2 with respect to the light beams 20 towards the optical axis 16.
  • the refraction angle ⁇ 1 of the red partial light beam preferably coincides with the size of the refraction angle ⁇ 2 of the blue partial light beam.
  • the two marginal rays 21, 22 extend at a differential angle to the red partial light beam 14 or blue partial light beam 18 below the same, wherein the marginal ray 21 to the light beam 17 forms an angle ⁇ 1 , which is greater than ⁇ 1 and wherein the marginal ray 22 to the Light beam 20 forms an angle ⁇ 2 , which is smaller than ⁇ 1 , so that they can not contribute to an undesirable glare of road users.
  • the geometry of the same above and below the optical axis 16 is different.
  • the different geometry relates in particular to the outer edge region 15, 19, the in a rotationally symmetrical configuration of the optical element 6 an angle of 360 ° around the optical axis 16 includes.
  • the correction or manipulation according to the invention of, in particular, red partial light beams 14 and blue partial light beams 18 is thus not limited to those in FIG. 3 shown upper edge region 15 and lower edge region 19 limited.
  • the lens-shaped optical element 6 may also be associated with an LED lighting unit (LED headlight) as a light source, wherein the LED lighting unit consists of at least one LED lighting element or LED chip.
  • LED lighting unit LED headlight
  • the lens-shaped optical element 6 as a converging lens, preferably in a projection headlight, or as a horizontally and vertically different scattering lens, preferably in an LED headlamp, be formed.
  • the inventively formed lens-shaped optical element 6 allows the use of plastic optical elements in a relatively wide temperature range.

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)
EP08105129A 2008-08-26 2008-08-26 Phare pour véhicules Not-in-force EP2159478B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08105129A EP2159478B1 (fr) 2008-08-26 2008-08-26 Phare pour véhicules

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP08105129A EP2159478B1 (fr) 2008-08-26 2008-08-26 Phare pour véhicules

Publications (2)

Publication Number Publication Date
EP2159478A1 true EP2159478A1 (fr) 2010-03-03
EP2159478B1 EP2159478B1 (fr) 2012-10-03

Family

ID=40227939

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08105129A Not-in-force EP2159478B1 (fr) 2008-08-26 2008-08-26 Phare pour véhicules

Country Status (1)

Country Link
EP (1) EP2159478B1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1248600A (en) 1967-12-29 1971-10-06 Gte Sylvania Inc Automobile headlights
DE3430179A1 (de) * 1983-08-18 1985-03-07 Cibie Projecteurs, Bobigny Scheinwerfer mit elliptischem reflektor und abgeschnittenem lichtbuendel fuer kraftfahrzeuge
EP0325254A2 (fr) 1988-01-20 1989-07-26 Ichikoh Industries Limited Phare pour véhicules
DE4329332A1 (de) 1992-09-01 1994-03-03 Koito Mfg Co Ltd Scheinwerfer vom Projektionstyp, der verringerte Farbrandzonen besitzt
DE102004062913A1 (de) 2004-12-22 2006-07-06 Schott Ag Beleuchtungseinrichtung mit Linse
DE102005031776A1 (de) 2005-07-07 2007-01-18 Hella Kgaa Hueck & Co. Scheinwerfer für Fahrzeuge

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1248600A (en) 1967-12-29 1971-10-06 Gte Sylvania Inc Automobile headlights
DE3430179A1 (de) * 1983-08-18 1985-03-07 Cibie Projecteurs, Bobigny Scheinwerfer mit elliptischem reflektor und abgeschnittenem lichtbuendel fuer kraftfahrzeuge
EP0325254A2 (fr) 1988-01-20 1989-07-26 Ichikoh Industries Limited Phare pour véhicules
DE4329332A1 (de) 1992-09-01 1994-03-03 Koito Mfg Co Ltd Scheinwerfer vom Projektionstyp, der verringerte Farbrandzonen besitzt
DE102004062913A1 (de) 2004-12-22 2006-07-06 Schott Ag Beleuchtungseinrichtung mit Linse
DE102005031776A1 (de) 2005-07-07 2007-01-18 Hella Kgaa Hueck & Co. Scheinwerfer für Fahrzeuge

Also Published As

Publication number Publication date
EP2159478B1 (fr) 2012-10-03

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