EP0742407B1 - Kfz-Leuchte - Google Patents

Kfz-Leuchte Download PDF

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Publication number
EP0742407B1
EP0742407B1 EP96107397A EP96107397A EP0742407B1 EP 0742407 B1 EP0742407 B1 EP 0742407B1 EP 96107397 A EP96107397 A EP 96107397A EP 96107397 A EP96107397 A EP 96107397A EP 0742407 B1 EP0742407 B1 EP 0742407B1
Authority
EP
European Patent Office
Prior art keywords
section line
lighting device
section
reflector
lines
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
EP96107397A
Other languages
English (en)
French (fr)
Other versions
EP0742407A1 (de
Inventor
Iordanka Neytcheva
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.)
Marelli Automotive Lighting Italy SpA
Original Assignee
Automotive Lighting Italia SpA
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 Automotive Lighting Italia SpA filed Critical Automotive Lighting Italia SpA
Publication of EP0742407A1 publication Critical patent/EP0742407A1/de
Application granted granted Critical
Publication of EP0742407B1 publication Critical patent/EP0742407B1/de
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
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/32—Optical layout thereof
    • F21S41/33—Multi-surface reflectors, e.g. reflectors with facets or reflectors with portions of different curvature
    • F21S41/334—Multi-surface reflectors, e.g. reflectors with facets or reflectors with portions of different curvature the reflector consisting of patch like sectors
    • 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
    • F21S41/33—Multi-surface reflectors, e.g. reflectors with facets or reflectors with portions of different curvature
    • F21S41/337—Multi-surface reflectors, e.g. reflectors with facets or reflectors with portions of different curvature the reflector having a structured surface, e.g. with facets or corrugations

Definitions

  • the present invention relates to a lighting device for a motor vehicle, especially a headlamp or other light.
  • present-day lighting devices for motor vehicles comprise a source of light (bulb) that generates a light beam, a reflector that receives the light beam generated by the source and distributes it within a limited solid angle, and a prismatic transparent cover made up of a plurality of diffusing lens elements that spread the light beam within a broader solid angle in accordance with the motor vehicle lighting regulations.
  • a source of light bulb
  • a reflector that receives the light beam generated by the source and distributes it within a limited solid angle
  • a prismatic transparent cover made up of a plurality of diffusing lens elements that spread the light beam within a broader solid angle in accordance with the motor vehicle lighting regulations.
  • Lighting devices of this kind have drawbacks in that they result in significant loss of luminous flux owing to suboptimal distribution of the flux, the light being spread uniformly by the lens, without the light gradient that would be necessary for good illumination.
  • the reflector which is conventionally of parabolic shape with the light source positioned at its focal point, has been investigated in recent years and proposals have been made for generating light beams with a specific distribution better suited to the type of illumination required.
  • Reflectors have for example been proposed with non-parabolic surfaces made up of dissimilar portions joined together with discontinuities at the tangents. The surfaces are however complicated and do not always perform as desired.
  • the object of the present invention is to provide a new lighting device capable of distributing the light beam generated by the source within a wide field, in accordance with the specifications of existing regulations, without requiring the use of a diffusing lens.
  • a lighting device for a motor vehicle is structured according to Claim 1.
  • this figure schematically shows a lighting device 1 according to the invention comprising a source of light 2 (bulb) and a reflector 3. No prismatic transparent cover is present.
  • the reflector 3 is here imagined to be divided into four portions 4 corresponding to four quarter surfaces bounded by a horizontal section line 5 and by a vertical section line 6.
  • first to be generated is the surface of a portion 4, after which the other three portions are generated by reflection in order together to yield the complete surface.
  • Figure 2 shows curve 5 defining the horizontal section and curve 6 defining the vertical section of the reflector 3; also shown is the guide line 7 for the transformation by which horizontal curve 5 is moved to vertical curve 6 (or vice versa).
  • horizontal curve 5 and vertical curve 6 are generated first of all, in such a way as to give the desired distribution of the light, already having the final output distribution of the lighting device 1.
  • Examples of the distribution of light suitable for motor vehicle lamps for curve 5 defining the horizontal section and for curve 6 defining the vertical section are shown in Figures 4 and 5.
  • Curves 5 and 6 can be produced either graphically on a computer, starting with basic curves such as parabolic curves and gradually modifying them graphically until the desired distribution is obtained, or starting with non-rational parametric curves described by equations of the following type: or rational curves with equations of the following type: in which b i are the co-ordinates of the vertices of the polygons, B i (t) are Bernstein functions and w are weightings.
  • the surface of a portion 4 of the reflector 3 is generated by sliding the curve 5, which corresponds to the horizontal section, along the guide curve 7 and changing its shape as it moves in such a way as to transform it gradually into curve 6 which corresponds to the vertical section.
  • This sliding advantageously performed on a computer using a graphic design programme (CAD), moves the inward end of curve 5 (marked 10 in Figure 2) to the inward end 11 of curve 6 along the guide curve 7.
  • CAD graphic design programme
  • the surface 4 produced graphically in this way is then reflected to produce the other three surface portions 4 (axial symmetry).
  • dispensing with the diffusing lens brings three advantages: it eliminates the stray light which in known lighting devices was caused by scattering by the external lens into regions where less light is wanted; it improves the visual appearance of the lighting device; and it lowers the cost of manufacturing the lighting device in terms of both the lens material and the moulding of the lens.
  • the device according to the invention can be made to the necessary dimensions, and the dimensions can even be reduced.
  • the lighting device described and illustrated herein can be modified and altered without thereby departing from the protective scope of the present invention.
  • the basic curves used to construct the surface may be different, provided they distribute the light in the desired manner, and may be generated mathematically or graphically by computer; the surface may also be made up of a different number of portions, for example three, with one being generated by the method described and the other two generated by reflection; indeed, the surface may even comprise only the portion generated by transformation, since this portion is already able to distribute the light in the desired manner.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)

Claims (6)

  1. Beleuchtungsvorrichtung (1) für ein Kraftfahrzeug, die mit einer Lichtquelle (2) versehen ist, die einen Lichtstrahl erzeugen kann, und einem Reflektor (3), der den Lichtstrahl im Raum verteilen kann, wobei der Reflektor (3) ein nicht-parabolischer Reflektor mit einer kontinuierlichen komplexen Reflexionsoberfläche ist, wobei die Vorrichtung dadurch gekennzeichnet ist, daß die Reflexionsoberfläche des Reflektors (3) wenigsten einen Oberflächenabschnitt (4) umfaßt, der durch eine erste und eine zweite Schnittlinie (5, 6) begrenzt ist, wobei die Schnittlinien (5, 6) so konfiguriert sind, daß sie den Lichtfluß in der gewünschten Weise gemäß den Bestimmungen auf der in Frage kommenden Schnittlinie direkt verteilen, wobei der wenigstens eine Oberflächenabschnitt (4) aus den Schnittlinien (5, 6) durch eine Transformation der ersten Schnittlinie (5) in die zweite Schnittlinie (6) erzeugt ist, die mittels Verschieben eines Endes (10) der ersten Schnittlinie (5) längs einer Führungslinie (7) zu einem entsprechenden Ende (11) auf der zweiten Schnittlinie (6) derart durchgeführt ist, daß jeder Punkt der ersten Schnittlinie kontinuierlich zu einem entsprechenden Punkt der zweiten Schnittlinie bewegt wird.
  2. Beleuchtungsvorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß sie keine prismatische Streulinseneinrichtung besitzt.
  3. Beleuchtungsvorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die erste Schnittlinie (5) eine horizontale Schnittlinie ist und die zweite Schnittlinie (6) eine vertikale Schnittlinie ist, wobei die Linien aufeinander senkrecht stehen.
  4. Beleuchtungsvorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß sie mehrere Oberflächenabschnitte (4) umfaßt, die durch Spiegelung des einen oder von mehreren Oberflächenabschnitten (4) erzeugt sind.
  5. Beleuchtungsvorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die erste und die zweite Schnittlinie (5, 6) durch rationale oder irrationale parametrische Kurven beschrieben sind.
  6. Beleuchtungsvorrichtung nach irgendeinem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die erste und die zweite Schnittlinie (5, 6) graphisch durch manuelle Verformung parabolischer Basis-Kurven erzeugt sind.
EP96107397A 1995-05-12 1996-05-09 Kfz-Leuchte Expired - Lifetime EP0742407B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO950381 1995-05-12
IT95TO000381A IT1279204B1 (it) 1995-05-12 1995-05-12 Dispositivo di illuminazione per autoveicoli

Publications (2)

Publication Number Publication Date
EP0742407A1 EP0742407A1 (de) 1996-11-13
EP0742407B1 true EP0742407B1 (de) 2000-09-13

Family

ID=11413552

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96107397A Expired - Lifetime EP0742407B1 (de) 1995-05-12 1996-05-09 Kfz-Leuchte

Country Status (4)

Country Link
EP (1) EP0742407B1 (de)
DE (1) DE69610245T2 (de)
ES (1) ES2151103T3 (de)
IT (1) IT1279204B1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6811289B2 (en) * 2001-01-22 2004-11-02 Ichikoh Industries, Ltd. Lamp device for a vehicle having a free curved surface and a lens without a prism

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4495552A (en) * 1982-12-13 1985-01-22 Cal Custom Accessories, Inc. Forward shining vehicle lamp
JP3207031B2 (ja) * 1993-10-01 2001-09-10 株式会社小糸製作所 車輌用灯具の反射鏡

Also Published As

Publication number Publication date
ES2151103T3 (es) 2000-12-16
IT1279204B1 (it) 1997-12-04
ITTO950381A0 (it) 1995-05-12
ITTO950381A1 (it) 1996-11-12
DE69610245D1 (de) 2000-10-19
DE69610245T2 (de) 2001-02-22
EP0742407A1 (de) 1996-11-13

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