EP0884522B1 - Kraftfahrzeugscheinwerfer mit einer Zweifadenlampe - Google Patents

Kraftfahrzeugscheinwerfer mit einer Zweifadenlampe Download PDF

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Publication number
EP0884522B1
EP0884522B1 EP98100383A EP98100383A EP0884522B1 EP 0884522 B1 EP0884522 B1 EP 0884522B1 EP 98100383 A EP98100383 A EP 98100383A EP 98100383 A EP98100383 A EP 98100383A EP 0884522 B1 EP0884522 B1 EP 0884522B1
Authority
EP
European Patent Office
Prior art keywords
filament
reflector
focal point
headlight
double
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
EP98100383A
Other languages
English (en)
French (fr)
Other versions
EP0884522A3 (de
EP0884522A2 (de
Inventor
Roberto Cella
Davide Lorenzi
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.)
Fratelli Pagani SpA
Original Assignee
Fratelli Pagani 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 Fratelli Pagani SpA filed Critical Fratelli Pagani SpA
Publication of EP0884522A2 publication Critical patent/EP0884522A2/de
Publication of EP0884522A3 publication Critical patent/EP0884522A3/de
Application granted granted Critical
Publication of EP0884522B1 publication Critical patent/EP0884522B1/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
    • F21S41/10—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
    • F21S41/162—Incandescent light sources, e.g. filament or halogen lamps
    • F21S41/164—Incandescent light sources, e.g. filament or halogen lamps having two or more filaments

Definitions

  • the present invention relates to a headlight for motor vehicles, using a double-filament lamp to obtain the two functions of low beam and high beam.
  • the headlights of this type currently on the market comprise a reflector in a single parabolic body and a segmented or free-shaped surface, and a transparent front protection which may or may not be provided with a pattern of optical prisms.
  • An outer protective envelope can be placed round the reflector, forming the body of the headlight.
  • the double-filament lamp is positioned in the reflector so that the shield situated inside its bulb coinciding with the low beam filament is beneath the optical axis of the headlight, as shown in appended Figure 1.
  • the upper half-parabola is dedicated to the low beam function, whereas the whole surface of the parabola is used for the high beam function: the focal point of the parabola is disposed on the center line of the high beam filament, and the low beam filament is "out of focus" forward of the focal point of said parabola (see Figure 2).
  • the light distribution on the road surface created by headlights with a classical parabola is achieved through a pattern of optical prisms on the transparent protection.
  • the upper half-reflector is still dedicated to the low beam function, whereas the whole surface of the reflector is used for the high beam function.
  • the basic reflectors are generally portions of parabolas on which are laid sectors of surface with a definite and variable slant and bending radius.
  • the focal point of the lower basic parabola is still positioned in the middle of the high-beam filament, whereas the low-beam filament is "out of focus" forward of the focal point of the upper basic parabola (see Figure 3).
  • the light distribution on the road surface created by headlights having reflectors with a segmented or free-shaped surface is achieved directly by the reflector itself.
  • This second solution improves the distribution of the low beam on the road surface with respect to the first solution (with parabolic reflectors), shown in Figure 2. However, it does not substantially improve the light distribution of the high beam on the road surface, although it does improve the depth of said beam. In fact, to obtain an improvement, a dedicated supplementary high beam must generally be placed alongside the headlight.
  • DE 25 47 164 discloses a headlight for motor vehicles according to the preamble of claim 1.
  • the object of the invention is to improve the distribution on the road surface of the low beam and the high beam of a headlight with a double-filament lamp.
  • Another object of the invention is to provide a solution that is easy to apply, and that does not involve substantial modifications to existing headlights.
  • the double-filament lamp to be positioned in the reflector so that the shield of the lower beam filament situated inside its bulb is above the optical axis of the reflector.
  • the reflector can advantageously have a segmented or free-shaped surface, the lower half reflector being dedicated to the low beam function and the whole surface of the reflector being used for the high beam function.
  • the focal point of the upper basic parabola is situated in the middle of the high beam filament, whereas the lower beam filament is "out of focus" to the rear of the focal point of the lower basic parabola.
  • the proposed solution does not make it essential to use additional devices on vehicles to achieve an acceptable performance, as is required in some traditional solutions, thus allowing vehicle manufacturers a cost saving.
  • a classical double-filament lamp indicated by reference numeral 1
  • a classical double-filament lamp is depicted in a side view and substantially comprises a bulb 2, with the front surface 3 opacized, to shield the rays of light in this area.
  • a first filament 10 normally serving to produce the high beam
  • a second filament 20 normally serving to produce the low beam.
  • Beneath the filament 20 is disposed a shield or dish S, that prevents the filament 20 from diffusing beneath the median plane of the lamp 1.
  • Figure 2 illustrates the first known solution previously described, in which the lamp 1 is disposed in a classical parabolic reflector in a single body indicated by R, the focal point F of which is positioned on the midline of the high-beam filament 20.
  • the low-beam filament 30 on the other hand is disposed "out of focus" forward of the focal point F.
  • Figure 3 is a diagrammatic representation of the second solution according to the previously described prior art, in which the reflector is segmented and is depicted in particular with two segments of parabolas offset with respect to each other, R1, R2, having vertexes V1, V2 and focal points F1, F2, respectively.
  • the lamp 1 is disposed so that the filament 20 is centered on the focal point F1 of the lower half-parabola R1, while the filament 30 is still out of focus forward of the focal point F2 of the upper half parabola R2.
  • the examples of some reflected beams show how the high beam is directed in depth or upwards, with poor illumination of the road surface.
  • the reflector is shown segmented, with two half parabolas R1, R2.
  • the filament 20 of the high beam is centered on the focal point F1 of the upper half parabola R1, while the filament 30 producing the low beam is "out of focus" to the rear of the focal point F2 of the lower half parabola R2.
  • the solution proposed by the invention which essentially consists in shielding the low beam filament 30 on the upper side and suitably positioning the lamp 1 on the axis X of the reflector, substantially improves the distribution of the low beam on the road surface with respect to the prior art, and also substantially improves the distribution of the high beam on the road surface, at the same time maintaining an excellent performance in depth.
  • the invention therefore fully achieves the proposed aims.
  • the reflector can be a classical rather than a segmented reflector, although in this case the performance is obviously inferior.

Landscapes

  • 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 (4)

  1. Ein Scheinwerfer für Kraftfahrzeuge, der folgendes umfasst:
    einen Reflektor (R), der aus mindestens einer Paraboloidfläche besteht und eine optische Achse (X) sowie mindestens einen Brennpunkt (F1, F2) aufweist;
    eine Doppelglühdrahtlampe (1) mit einer Glühbirne (2), einem Glühdraht (20) für den hohen Lichtkegel und einem Glühdraht (30) für den niedrigen Lichtkegel, wobei die genannten Glühdrähte (20, 30) innen in der genannten Glühbirne (2) untergebracht und auf der genannten Achse (X) angeordnet sind;
    eine Abschirmung (S), die in Übereinstimmung mit dem letzteren Glühdraht (30) positioniert ist,
    dadurch gekennzeichnet, dass die genannte Abschirmung (S) ein Einzelschirm (S) ist, der über der optischen Achse (X) des Reflektors und innen in der genannten Glühbirne (2) angeordnet ist.
  2. Ein Scheinwerfer gemäß Anspruch 1, dadurch gekennzeichnet, dass der genannte Glühdraht (30) "außerhalb des Brennpunkts" zur Rückseite des Brennpunkts des Reflektors liegt.
  3. Ein Scheinwerfer gemäß Anspruch 1 oder 2, dadurch gekennzeichnet, dass der genannte Reflektor segmentiert oder freiförmig ist, wobei der untere Halbreflektor (R2) für die niedrige Lichtkegelfunktion vorgesehen ist und die ganze Fläche des Reflektors (R1, R2) für die hohe Lichtkegelfunktion verwendet wird.
  4. Ein Scheinwerfer gemäß Anspruch 3, dadurch gekennzeichnet, dass der genannte Glühdraht (20) auf den Brennpunkt (F1) des oberen Halbreflektors (R1) zentriert ist, wohingegen der genannte untere Lichtkegel-Glühdraht (30) "außerhalb des Brennpunkts" zur Rückseite des Brennpunkts (F2) des unteren Halbreflektors (R2) liegt.
EP98100383A 1997-06-12 1998-01-12 Kraftfahrzeugscheinwerfer mit einer Zweifadenlampe Expired - Lifetime EP0884522B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT97MI001395A IT1292152B1 (it) 1997-06-12 1997-06-12 Proiettore per veicoli a motore con lampada bifilamento
ITMI971395 1997-06-12

Publications (3)

Publication Number Publication Date
EP0884522A2 EP0884522A2 (de) 1998-12-16
EP0884522A3 EP0884522A3 (de) 2000-10-04
EP0884522B1 true EP0884522B1 (de) 2005-11-16

Family

ID=11377355

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98100383A Expired - Lifetime EP0884522B1 (de) 1997-06-12 1998-01-12 Kraftfahrzeugscheinwerfer mit einer Zweifadenlampe

Country Status (5)

Country Link
EP (1) EP0884522B1 (de)
AT (1) ATE310206T1 (de)
DE (1) DE69832327T2 (de)
ES (1) ES2253791T3 (de)
IT (1) IT1292152B1 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006156046A (ja) 2004-11-26 2006-06-15 Koito Mfg Co Ltd 車両用前照灯
DE102007062136A1 (de) * 2007-12-21 2009-06-25 Hella Kgaa Hueck & Co. Scheinwerfer für Fahrzeuge
DE102010013821B4 (de) * 2010-04-03 2016-09-15 Volkswagen Ag Leuchtenvorrichtung und Verfahren zur Erzeugung einer ersten und einer zweiten Lichtfunktion für ein Fahrzeug
DE102010014205A1 (de) * 2010-04-08 2011-10-13 Willi Wolfgang Oswald Leuchte mit Nebelmaschine
CN107654958B (zh) * 2014-04-30 2020-02-07 王正 车灯模块

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE7413325L (sv) * 1974-10-23 1976-04-26 Erik Wilkenson Anordning vid en for motorfordon avsedd stralkastare
DE2757713A1 (de) * 1977-12-23 1979-06-28 Bayerische Motoren Werke Ag Scheinwerfer fuer kraftfahrzeuge
DE3104613A1 (de) * 1981-02-10 1982-08-19 Robert Bosch Gmbh, 7000 Stuttgart Scheinwerfer fuer kraftfahrzeuge
US4566056A (en) * 1984-03-08 1986-01-21 Stanley Electric Co., Ltd. Headlamp for vehicle

Also Published As

Publication number Publication date
DE69832327T2 (de) 2006-08-10
EP0884522A3 (de) 2000-10-04
ATE310206T1 (de) 2005-12-15
EP0884522A2 (de) 1998-12-16
DE69832327D1 (de) 2005-12-22
ITMI971395A1 (it) 1998-12-12
IT1292152B1 (it) 1999-01-25
ITMI971395A0 (de) 1997-06-12
ES2253791T3 (es) 2006-06-01

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