EP0623780B1 - Lentille de projection pour phase de véhicule - Google Patents

Lentille de projection pour phase de véhicule Download PDF

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Publication number
EP0623780B1
EP0623780B1 EP94890077A EP94890077A EP0623780B1 EP 0623780 B1 EP0623780 B1 EP 0623780B1 EP 94890077 A EP94890077 A EP 94890077A EP 94890077 A EP94890077 A EP 94890077A EP 0623780 B1 EP0623780 B1 EP 0623780B1
Authority
EP
European Patent Office
Prior art keywords
light
optical axis
lens
projection lens
horizontal plane
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.)
Expired - Lifetime
Application number
EP94890077A
Other languages
German (de)
English (en)
Other versions
EP0623780A2 (fr
EP0623780A3 (fr
Inventor
Gert Krammer
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.)
ZKW Group GmbH
Original Assignee
Zizala Lichtsysteme GmbH
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 Zizala Lichtsysteme GmbH filed Critical Zizala Lichtsysteme GmbH
Publication of EP0623780A2 publication Critical patent/EP0623780A2/fr
Publication of EP0623780A3 publication Critical patent/EP0623780A3/fr
Application granted granted Critical
Publication of EP0623780B1 publication Critical patent/EP0623780B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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

Definitions

  • the invention relates to a vehicle headlight projection lens for generating a low beam pattern, in which the convex emission surface of the lens has different imaging sections, an upper section lying above the horizontal plane through the optical axis and a lower section lying below this horizontal plane being provided.
  • Such a projection lens is shown in DE-OS 36 02 262 for a headlight for low beam or fog light, which has an aperture covering the lower section of the reflector, the upper edge of which produces the light / dark boundary.
  • the projection lens according to the invention of the type mentioned at the outset is not limited to such a headlight construction and is characterized in particular by the fact that at least two lower sections are provided, one of which has an upper boundary that rises above the horizontal plane towards the lateral lens edge, or one that differs continuously imaging surface (open area) is provided.
  • the rising upper boundary can preferably be arranged on one side of the vertical plane through the optical axis; it can touch the horizontal plane at a point which is the point of intersection of a horizontal beam with the emitting surface, which extends from the point of intersection of the optical axis with the incident surface of the lens facing the light source at an angle to the optical axis.
  • the angle between the horizontal beam and the optical axis is expediently between ⁇ 5 °.
  • the curvatures of the radiation surface in the vertical section through the lens from the horizontal plane through the optical axis can be to the respective Lens edge be flatter.
  • the length of the lens contour in the upper lens section can be greater than in the lower lens section.
  • the curvatures of the radiation surface in the lower section can be a mirror image with respect to the horizontal plane through the optical axis with respect to the curvatures in the upper section.
  • the lower section with increasing horizontal upper boundary is formed by rotating the horizontal section through the horizontal beam by 15 °, which is defined by the intersection curve of the vertical plane running through the horizontal beam with the radiation surface, the intersection curve of the horizontal plane through the optical axis with the radiation surface and the lens edge , a transition gusset with a running curvature being provided between the twisted section and the remaining lower section.
  • the incident surface of the lens can be provided at right angles to the optical axis.
  • the incident surface can be provided, preferably as a rectangle, for coupling to an optical fiber bundle.
  • the lower boundary of the light irradiation surface can be arranged in the horizontal plane through the optical axis.
  • the lens body can extend essentially in the shape of a truncated pyramid or in the shape of a truncated cone from the irradiation surface to the radiation surface.
  • FIG. 1 shows an axonometric oblique bottom view
  • FIG. 2 shows a bottom view
  • FIG. 3 shows an end view (view of the radiation surface)
  • FIG. 4 shows a side view
  • 5 a vertical section through the optical axis
  • FIG. 6 a vertical section through the optical axis with beam path and Represent radiation imaging on a vertical plane 25 m in front of the lens with respect to a projection lens according to the invention.
  • the convex radiation surface of the lens 1 has an upper and three lower sections.
  • the upper section is delimited by the lens edge 2 and the lines A and B, of which A lies in the horizontal plane through the optical axis 3 and B rises to the lens edge at 7.5 ° relative to the horizontal plane.
  • a lower section is delimited by A, the lens edge 2 and the line C; this is followed by a transition gusset which is delimited by line C, lens edge 2 and line D, and a further section which is delimited by line D, lens edge 2 and line B.
  • the lines A-D are not to be regarded as edges in the radiation area - although such an embodiment is possible - but as lines along which the curvature changes to the transition to the neighboring section.
  • a rectangle 5 perpendicular to the optical axis is provided as the lens irradiation surface, which sits with its lower edge centrally (point P) on the horizontal plane through the optical axis 3 and to which an optical fiber bundle can be coupled.
  • the light exit band 6 of the optical fiber bundle is - as indicated - vertically displaceable for the headlight range adjustment, which can take place by relative displacement between the light source and the light entry surface of the optical fiber bundle.
  • the line C and point 4 come about by cutting a vertical plane 7 through the point P, which is the point of intersection of the optical axis with the light entry surface 5 of the lens 1, with the emission surface of the lens.
  • the vertical plane 7 is inclined to the vertical plane through the optical axis 3 by approximately 3 to 5 °. From Fig. 3 it can be seen that line C is a curve on the radiation surface of the lens.
  • the imaginary section delimited by the line C, the lens edge 2 and the horizontal plane 8 by the optical axis 3 becomes the formation the so-called gusset with asymmetrical low beam is pivoted upward by 15 ° around the connecting line P4 as a pivot axis, as a result of which CD and the pivoted imaginary section, together with the upper section symmetrical with respect to the horizontal plane 8, form a surface intersection line B which is inclined by 7.5 ° to the horizontal plane .
  • the surface curvatures are chosen to pass smoothly.
  • the contour 0 of the upper half of the radiation surface is longer in vertical section than its lower contour U, i.e. the distance between the intersection of the optical axis with the radiation surface and the upper lens edge is greater than that between this intersection and the lower lens edge.
  • the beam path in the central vertical plane is drawn from a light entry surface with the height h, provided that the light guide bundle does not transmit parallel light, but is fed by a point light source, so that edge rays emerge at an angle to the optical axis.
  • the vertical section it is a condition that the upper and lower half of the radiation surface produce sharp images in the horizontal plane through the optical axis; fuzzy images below this result automatically.
  • These images P and P ' are shown on a vertical projection wall 10 25 m in front of the lens 1.
  • the contour of the lower half of the radiation in FIGS. 4-6 is essentially symmetrical to the horizontal plane through the optical axis.
  • the curvature of the radiation surface is calculated iteratively approximately, with the points of the curve in relation to the optical axis being the condition in the central vertical section n.sin ⁇ sin ⁇ This condition applies to light rays starting from the edge of the light band facing the horizontal plane through the optical axis and ending in the horizontal plane at a distance of 25 m from the lens (or 5 m for the table).
  • the angle of incidence ⁇ and ⁇ included with the tangent normal of the respective surface point is the corresponding departure angle, taking into account that the transition from the solder to the optically denser / optically thinner, ie ⁇ > ⁇ .
  • the coordinates were determined on the basis of a lens length (distance between the irradiation surface and the intersection of the optical axis with the emission surface) of 90 mm and a lens height of 70 mm.
  • the lens height results from the numerical aperture of the light guide or the maximum opening angle of the light cone in the lens material, starting from the boundary of the incident surface; here about 55 °.
  • z is the coordinate of the respective point on the optical axis and y the distance of this point from the optical axis, each in mm.
  • the vertical cut contours are particularly important; the horizontal cut contours are not critical and can e.g. Be circular sections with flattened edge areas; this is regulated by the width of the desired light pattern and the required central illuminance.
  • the projection lens according to the invention does not have to be provided for irradiation via an optical fiber bundle; usual light sources / reflector combinations can also be provided.
  • the rear irradiation surface of the lens is designed accordingly.
  • the projection lens with a flat irradiation surface shown in Figs. 1-4 can e.g. can be used very well with a light source with an ellipsoid reflector.
  • a relative displacement between the light source and the light entry surface of the optical fiber bundle enables the light exit band on the light entry surface of the lens to be shifted for the headlight range adjustment.
  • This is particularly effective if the light guide transmits light bundled in parallel, since a sharp light band limitation can then be achieved in the optical fiber bundle.
  • the displacement of the light band across the cross section of the optical fiber bundle is particularly easy to implement in an arrangement in which at least one light source in the form of a flash lamp is moved past the inlet openings of successive optical fiber bundles.
  • the time of flash firing is the control factor for determining the position of the light band in the entry surface of the projection lens and thus the lighting range.
  • the light band limitation can also depend on the light exit surface of the light entry surface of the Optical fiber bundle passed reflector (eg 5 x 10 mm) and the gap between them (eg 0.1 mm) because the edge blur of the light band also decreases with a decreasing gap.
  • the light band limitation can be adjusted according to static criteria (inclination of the optical axis to the horizontal due to vehicle load) and / or dynamic criteria (compensation for uneven roads), as well as depending on the light emitted by oncoming vehicles.
  • a film stack is preferred for the lens construction shown, the films of which lie on the light entry surface 5 of the lens 1 parallel to the horizontal plane 8 through the optical axis 3 and preferably have a thickness of 0.2 mm.
  • an at least one-dimensional strip order can be achieved in the light guide bundle, with different orders also being able to be provided within the individual strips.
  • the smallest possible angular resolution of the light exit angle of the light guide bundle is aimed for with a sharp light / dark edge, the angular resolution preferably not being constant over the bundle cross section. It is also preferred that the illuminance distribution over the bundle cross section is not constant.
  • the light entry surface of the lens is shown in the figures as rectangular and at right angles to the optical axis, it can be different in shape - e.g. be adapted to the light exit surface of light guide bundles of any cross section.
  • the projection lens according to the invention is furthermore not limited to feeding via optical fiber bundles; in particular not the solid lens of uniform cross section shown in the figures, which can also be illuminated using incandescent lamps / reflector combinations.
  • the light entry surface of the lens can be at an angle to the optical axis, e.g.
  • the light incident surface of the projection lens can also be particularly preferably a curved surface in order to achieve the greatest possible image sharpness.
  • the outer surfaces of the projection lens according to the invention - of course with the exception of the irradiation surface and the radiation surface - can be opaque to increase the light output, especially coated white.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Lenses (AREA)

Claims (11)

  1. Lentille à projection de projecteur route pour la génération d'un dessin de feu de croisement, où la surface emittante convexe de la lentille a des segments dont les capacités de former des images sont differentes, un segment supérieur arrangé au-dessus du plan horizontal à travers l'axe optique et un segment inférieur arrangé au-dessous de ce plan horizontal étant prévus, caractérisée en ce qu'il y a au moins deux segments inférieurs, dont l'un est muni d'une délimitation supérieure (B) montant au-dessus de ce plan horizontal (8) vers l'arête latérale de la lentille et/ou qu'il y a une surface dont la capacité de former des images est variée de facon continue (surface complexe).
  2. Lentille de projection selon la revendication 1, caractérisée en ce que la délimitation supérieure montante (B), préférablement arrangée d'un côté du plan vertical à travers l'axe optique, touche le plan horizontal dans un point (4) qui est le point d'intersection d'un rayon horizontal (7) passant du point d'intersection (P) de l'axe optique (3) avec la surface irradiée (5) de la lentille, tournée vers la source lumineuse, sous un angle à l'axe optique, et la surface emittante.
  3. Lentille de projection selon la revendication 2, caractérisée en ce que l'angle entre le rayon horizontal (7) et l'axe optique (3) est un angle entre ± 5°.
  4. Lentille de projection selon l'une des revendications l à 3, caractérisée en ce que les courbures de la surface emittante sont, en coupe verticale à travers la lentille (1), formées moins raides du plan horizontal (8) à travers l'axe optique (3) vers l'arête respective de la lentille.
  5. Lentille de projection selon la revendication 4, caractérisée en ce que la longueur du contour de la lentille est plus grande dans le segment supérieur de la lentille que dans son segment inférieur.
  6. Lentille de projection selon l'une des revendications 4 ou 5, caractérisée en ce que les courbures de la surface emittante dans le segment inférieur forment une image réfléchie vis-à-vis le plan horizontal (8) à travers l'axe optique (3) relatif aux courbures dans le segment supérieur.
  7. Lentille de projection selon l'une des revendications 2 à 6, caractérisée en ce que le segment inférieur avec délimitation supérieure montante (B) est formé par tournant de 15° le segment inférieur imaginaire, étendu par la courbe d'intersection (C) du plan vertical à travers le rayon horizontal (7) avec la surface radiante, la courbe d'intersection du plan horizontal (8) à travers l'axe optique (3) avec la surface radiante et l'arête de lentille (2), un coin de transition ayant une courbure rajustante étant prévu entre le segment tourné et le reste du segment inférieur.
  8. Lentille de projection selon l'une des revendications 1 à 7, caractérisée en ce que la surface irradiée (5) de la lentille (1) est prévuée à surface plane à angle droit avec l'axe optique (3).
  9. Lentille de projection selon la revendication 8, caractérisée en ce que la surface irradiée (5) est prévue comme rectangle pour accouplement à un faisceau d'elements optiques.
  10. Lentille de projection selon la revendication 9, caractérisée en ce que la délimitation inférieure de la surface irradiée de lumière est arrangée dans le plan horizontal (8) à travers l'axe optique (3).
  11. Lentille de projection selon l'une des revendications 9 ou 10, caractérisée en ce que le corps de lentille s'étend essentiellement comme tronc de pyramide ou tronc de cône de la surface irradiée à la surface emittante.
EP94890077A 1993-05-03 1994-05-02 Lentille de projection pour phase de véhicule Expired - Lifetime EP0623780B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT855/93 1993-05-03
AT0085593A AT400887B (de) 1993-05-03 1993-05-03 Fahrzeugscheinwerferprojektionslinse

Publications (3)

Publication Number Publication Date
EP0623780A2 EP0623780A2 (fr) 1994-11-09
EP0623780A3 EP0623780A3 (fr) 1995-01-25
EP0623780B1 true EP0623780B1 (fr) 1996-11-06

Family

ID=3501352

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94890077A Expired - Lifetime EP0623780B1 (fr) 1993-05-03 1994-05-02 Lentille de projection pour phase de véhicule

Country Status (4)

Country Link
EP (1) EP0623780B1 (fr)
AT (1) AT400887B (fr)
DE (1) DE59400981D1 (fr)
ES (1) ES2094038T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8123388B2 (en) 2008-12-25 2012-02-28 Ichikoh Industries, Ltd. Vehicle headlamp

Families Citing this family (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3521441B2 (ja) * 1993-06-16 2004-04-19 株式会社デンソー 車両用灯具装置
JPH07159897A (ja) * 1993-12-07 1995-06-23 Nippondenso Co Ltd 光源装置
JPH07326204A (ja) * 1994-05-31 1995-12-12 Nippondenso Co Ltd 車両用灯具装置
JP3337560B2 (ja) * 1994-07-21 2002-10-21 株式会社デンソー 車両用灯具装置
JPH08138408A (ja) * 1994-11-11 1996-05-31 Nippondenso Co Ltd 車両用前照灯
JPH08195103A (ja) * 1994-11-15 1996-07-30 Nippondenso Co Ltd 車両用灯具装置
JPH08167301A (ja) * 1994-12-12 1996-06-25 Nippondenso Co Ltd 車両用前照灯
JPH08175259A (ja) * 1994-12-21 1996-07-09 Nippondenso Co Ltd 車両用前照灯
JPH08203303A (ja) * 1995-01-31 1996-08-09 Nippondenso Co Ltd 灯具装置
EP1306607B1 (fr) * 1995-09-12 2005-11-16 Denso Corporation Dispositif pour lampe à décharge
JP3455827B2 (ja) * 1995-10-18 2003-10-14 株式会社デンソー 車両用前照灯における配光形成用レンズ
DE19811570C2 (de) 1998-03-17 2001-08-02 Volkswagen Ag Fahrzeugscheinwerfer mit einem Gehäuse und einer Lichtscheibe für eine blendfreie Signalbildfunktion
DE19813597A1 (de) * 1998-03-27 1999-09-30 Volkswagen Ag Beleuchtungseinrichtung. insbesondere Scheinwerfer nach dem Projektionsprinzip für Kraftfahrzeuge
DE19857439A1 (de) * 1998-12-12 2000-06-15 Hella Kg Hueck & Co Scheinwerfer
DE102004043706B4 (de) * 2004-09-09 2010-04-01 Oec Ag Optisches System für einen Kraftfahrzeugscheinwerfer, Beleuchtungseinheit für einen Kraftfahrzeugscheinwerfer und Kraftfahrzeugscheinwerfer
JP2006210294A (ja) * 2005-01-31 2006-08-10 Ichikoh Ind Ltd 車両用灯具および車両用前照灯装置
US7563008B2 (en) * 2006-03-28 2009-07-21 Visteon Global Technologies, Inc. LED projector headlamps using single or multi-faceted lenses
DE102007018996A1 (de) * 2007-04-21 2008-10-23 Hella Kgaa Hueck & Co. Scheinwerfer für Fahrzeuge
JP5235502B2 (ja) * 2008-05-28 2013-07-10 株式会社小糸製作所 車両用照明灯具
FR2975462B1 (fr) * 2011-05-17 2013-05-17 Valeo Vision Unite optique, notamment pour vehicule automobile
FR2994246B1 (fr) * 2012-08-02 2019-03-15 Valeo Vision Lentille optique pour dispositif d'eclairage notamment de vehicule automobile
FR3002304A1 (fr) * 2013-02-21 2014-08-22 Valeo Vision Lentille, notamment pour une unite optique

Family Cites Families (2)

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Publication number Priority date Publication date Assignee Title
DE3602262C2 (de) * 1985-11-07 1995-05-11 Bosch Gmbh Robert Refraktorelement für einen Kraftfahrzeugscheinwerfer für Abblendlicht oder Nebellicht
AT396675B (de) * 1985-12-04 1993-11-25 Zizala Lichtsysteme Gmbh Fahrzeugleuchte

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8123388B2 (en) 2008-12-25 2012-02-28 Ichikoh Industries, Ltd. Vehicle headlamp

Also Published As

Publication number Publication date
ES2094038T3 (es) 1997-01-01
ATA85593A (de) 1995-08-15
AT400887B (de) 1996-04-25
DE59400981D1 (de) 1996-12-12
EP0623780A2 (fr) 1994-11-09
EP0623780A3 (fr) 1995-01-25

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