EP0741262A2 - Kraftfahrzeugscheinwerfer mit einer zum Erzeugen des Lichtbündels durch Reflektion bearbeiteten reflektierenden Fläche - Google Patents

Kraftfahrzeugscheinwerfer mit einer zum Erzeugen des Lichtbündels durch Reflektion bearbeiteten reflektierenden Fläche Download PDF

Info

Publication number
EP0741262A2
EP0741262A2 EP96104681A EP96104681A EP0741262A2 EP 0741262 A2 EP0741262 A2 EP 0741262A2 EP 96104681 A EP96104681 A EP 96104681A EP 96104681 A EP96104681 A EP 96104681A EP 0741262 A2 EP0741262 A2 EP 0741262A2
Authority
EP
European Patent Office
Prior art keywords
vehicle headlight
circle
arcs
headlight
parabola
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.)
Withdrawn
Application number
EP96104681A
Other languages
English (en)
French (fr)
Other versions
EP0741262A3 (de
Inventor
Vicenzo Lioy
Lucio Olivetti
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.)
TRI OM SpA
TRI O M SpA
Original Assignee
TRI OM SpA
TRI O M 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 TRI OM SpA, TRI O M SpA filed Critical TRI OM SpA
Publication of EP0741262A2 publication Critical patent/EP0741262A2/de
Publication of EP0741262A3 publication Critical patent/EP0741262A3/de
Withdrawn legal-status Critical Current

Links

Images

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
    • F21V7/00—Reflectors for light sources
    • F21V7/04—Optical design
    • 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 refers to headlights for motor vehicles comprising a reflector equipped with a worked or "carved” reflecting surface for shaping the light beam through reflection only.
  • headlights for vehicles designed for generating light beams for lower (traffic) beams and/or upper (driving) beams or to be mounted in fog lights, rear fog lights, backing lamps and the like are generally provided with a paraboidal or ellipsoidal reflector member with the filament of a lamp located near the focus thereof in a relationship depending on the function to be accomplished by the headlight.
  • the light which has been reflected by the reflector is then "shaped" by refraction through either a lens (for ellipsoidal reflectors) or one or more systems comprising lenses and prisms (for parabolic reflectors) in order to obtain the desired light distribution.
  • a lens for ellipsoidal reflectors
  • prisms for parabolic reflectors
  • the transparent refractor needs to be located very precisely in respect of the reflector and its angle of inclination is limited to a maximum value of 30° (with respect to the horizontal plane) because of light penetration and dispersion phoenomena, and because of the manufacturing technique. Additionally, an uneven thickness of such transparent means causes an absorption of the light beam that can be between 25% and 30% of the overall light intensity.
  • the object of the present invention is to overcome the above mentioned drawbacks, particularly the absorption inconvenience, by shaping the light beam distribution directly through the reflector, thus eliminating the need of a refracting device which is replaced by a simple clear transparent glass with the only function of protecting the reflector.
  • An essential feature of the headlight according to the present invention consists in that the reflector "shapes", i.e. modifies the light beam thanks to a composite reflecting surface formed by a plurality of adjacent columnar reflecting portions profiled - in a transverse cross section - as arcs of circles with the ends of such arcs located on a reference curve formed by one or more segments of conics.
  • the reflector according to the invention allows for a quick design and check, and the resulting surface is uniform and aesthetically pleasant.
  • the beam shaping is accomplished through a modification of the surface of the reflector by replacing the profile of a "reference" paraboloid (or other surface of revolution) with a plurality of adjacent columnar reflecting surfaces (also called lenses) the cross sections of which are arcs of circles with both ends lying on two predetermined points of the reference parabola (or other conic curve) in the plane of the cross-section.
  • the parameters of said arcs of circles such as radius and length, are selected so that the reflection of a filament light in the intersection point reaches a plane (perpendicular to the optical axis) at an assigned distance from the center of such plane.
  • the cross-section curve formed by the plurality of adjacent arcs of circles is then vertically shifted along a conic directrix that can be an arm of a parabola, of an ellipse, of a circle, or a curve made up by a combination of more conics.
  • the reference parabola be formed by a segment of a single curve; it can be formed by properly selected segments of parabolas having different focuses or foci. More generally the reflector member can be formed by one or more portion of surfaces of revolution.
  • the reflecting lens pitch (length of the sector) can be either constant or variable, in accordance with the design needs.
  • the reflector of the invention works with any filament of any lamp that has been approved for motor vehicles (with or without a shielding cup).
  • the shape of the headlight when seen frontally, can have any suitable shape e.g. round, squared, rectangular or elliptical.
  • the cross-section profile of a parabolic reflector is modified by replacing an arc of the reference conic with an arc of circle 1 the ends 5, 7 of which rest on the conic 3, and more precisely are coincident with the ends of the arc to be replaced.
  • a light ray from the filament 9 of a lamp 17 located near the focus of the reference parabola 3 is reflected by the curve 1, at point 5 or 7, onto a plane 11 at an assigned distance from the center point 15 defined by the intersection of plane 11 with the optical axis 13.
  • the above profile is easily designed and verified, and at the same time leads to a uniform surface that is aesthetically pleasant.
  • More particularly such modelling is carried out through arcs of circle 1 that rest (i.e. start and terminate) on the profile of the reference parabola 3, i.e. for the or each arc of circle both ends coincide with the ends of the arc of the reference parabola to be replaced.
  • the arcs of circle are selected so that a light ray from the filament 9 is reflected by said intersection points 3 or 5 into a plane 11 (that is orthogonal to the optical axis 13) at an assigned distance from the center point 15 defined by the intersection of plane 11 with the optical axis 13.
  • the so obtained curve is then vertically shifted or reproduced along a directrix of the reference conic that can be a parabola, an ellipse, a circle or a combination of more conic sections.
  • the curved edges of each of the adjacent columnar reflecting surfaces 1 lie on the surface of the reference paraboloid (or other selected surface of rotation).
  • the pitch of the reflecting lens (that is the length of the sector) can be either constant or variable.
  • the distance between the end points 5 and 7, as measured perpendicularly to the optical axis 13, is kept constant.
  • any filament 9 of any lamp 17 that has been officially approved for motor vehicles can be used in the headlight of the invention (with or without a cup).
  • the headlight frontally can have any shape, such as round, squared, rectangular (as shown in Fig. 5) or elliptical.
  • FIG. 3 shows a perspective view of a reflector 19 according to the invention and Fig. 4 illustrates a reflector 19' of the prior art.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
EP96104681A 1995-04-03 1996-03-25 Kraftfahrzeugscheinwerfer mit einer zum Erzeugen des Lichtbündels durch Reflektion bearbeiteten reflektierenden Fläche Withdrawn EP0741262A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT95RM000214A IT1276514B1 (it) 1995-04-03 1995-04-03 Proiettore per veicoli con riflettore "lentinato" per modellare il flusso luminoso tramite riflessione.
ITRM950214 1995-04-03

Publications (2)

Publication Number Publication Date
EP0741262A2 true EP0741262A2 (de) 1996-11-06
EP0741262A3 EP0741262A3 (de) 1997-01-08

Family

ID=11403234

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96104681A Withdrawn EP0741262A3 (de) 1995-04-03 1996-03-25 Kraftfahrzeugscheinwerfer mit einer zum Erzeugen des Lichtbündels durch Reflektion bearbeiteten reflektierenden Fläche

Country Status (2)

Country Link
EP (1) EP0741262A3 (de)
IT (1) IT1276514B1 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2821148A1 (fr) * 2001-02-20 2002-08-23 Koito Mfg Co Ltd Procede de determination de la surface reflechissante d'un reflecteur, et lampe de vehicule
EP1338468A3 (de) * 2002-02-26 2007-03-07 Ichikoh Industries, Ltd. Leuchte für Fahrzeuge
ITMI20090363A1 (it) * 2009-03-11 2010-09-12 Grechi Illuminazione S R L Sorgente luminosa a led con unità di convogliamento integrata
DE19837795B4 (de) * 1997-09-03 2013-10-31 Valeo Vision Spiegel für einen Kurvenscheinwerfer eines Kraftfahrzeugs und Scheinwerfer, der ihn enthält
AT15697U1 (de) * 2016-03-29 2018-04-15 Zkw Group Gmbh Fahrzeugscheinwerfer mit einem Reflektor

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1390747A (en) * 1920-06-15 1921-09-13 Flatlite Ltd Reflector for use in light-projectors
US2565757A (en) * 1946-06-05 1951-08-28 Electric Auto Lite Co Multibeam head lamp incorporating gradually fluted reflector and pluraality of filaments
FR2460442A1 (fr) * 1979-06-29 1981-01-23 Cibie Projecteurs Nouvelle structure de projecteur, notamment de projecteur d'automobile
JP2591094B2 (ja) * 1988-08-23 1997-03-19 市光工業株式会社 自動車用前照灯
JP2610546B2 (ja) * 1991-01-25 1997-05-14 株式会社小糸製作所 車輌用前照灯の反射鏡

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19837795B4 (de) * 1997-09-03 2013-10-31 Valeo Vision Spiegel für einen Kurvenscheinwerfer eines Kraftfahrzeugs und Scheinwerfer, der ihn enthält
FR2821148A1 (fr) * 2001-02-20 2002-08-23 Koito Mfg Co Ltd Procede de determination de la surface reflechissante d'un reflecteur, et lampe de vehicule
EP1338468A3 (de) * 2002-02-26 2007-03-07 Ichikoh Industries, Ltd. Leuchte für Fahrzeuge
ITMI20090363A1 (it) * 2009-03-11 2010-09-12 Grechi Illuminazione S R L Sorgente luminosa a led con unità di convogliamento integrata
AT15697U1 (de) * 2016-03-29 2018-04-15 Zkw Group Gmbh Fahrzeugscheinwerfer mit einem Reflektor

Also Published As

Publication number Publication date
IT1276514B1 (it) 1997-10-31
ITRM950214A1 (it) 1996-10-03
EP0741262A3 (de) 1997-01-08
ITRM950214A0 (it) 1995-04-03

Similar Documents

Publication Publication Date Title
US4811174A (en) Vehicle lighting device
US4494176A (en) Lamps having multiple and aimed parabolic sections for increased useful light output
US6910792B2 (en) Projection-type vehicular headlamp having improved lateral illumination
US5967647A (en) Headlight for a vehicle, especially a motor vehicle
US5440456A (en) Headlight for vehicles
JP2651753B2 (ja) 光源に改良を加えた自動車用前照灯
JPH0789447B2 (ja) 自動車のすれ違いビ−ム又は霧灯用投光器
JP2003123517A (ja) 投光ユニットおよび該投光ユニットを具備するｌｅｄ車両用照明灯具
JP2654116B2 (ja) 自動車用のすれ違いビームヘッドランプ
JP2003016813A (ja) プロジェクタ型ランプ
JP3156793B2 (ja) 自動車用前照灯
JPH06223601A (ja) 投光ヘッドランプ装置
JP2706766B2 (ja) ヘツドライト系
EP0355815A3 (de) Kraftfahrzeugscheinwerfer
US5045982A (en) Wide angle warning light
EP0432918A2 (de) Fahrzeugscheinwerfer
US3949214A (en) Vehicle lamp assembly
JP2591839B2 (ja) ランプ用反射鏡及びヘッドライトユニット
US1546281A (en) Reflector
EP0989354B1 (de) Scheinwerfer für Kraftfahrzeuge
KR0140528B1 (ko) 자동차용 전조등
JP3565875B2 (ja) 自動車に用いられるすれ違いビーム用前照灯
ITRM950214A1 (it) Proiettore per veicoli con riflettore "lentinato" per modellare il flusso luminoso tramite riflessione.
RU2009390C1 (ru) Автомобильная фара ближнего света
JPS6323603B2 (de)

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): DE ES FR IT

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): DE ES FR IT

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19970709