EP0884522B1 - Kraftfahrzeugscheinwerfer mit einer Zweifadenlampe - Google Patents

Kraftfahrzeugscheinwerfer mit einer Zweifadenlampe Download PDF

Info

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
EP0884522A2 (de
EP0884522A3 (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

Links

Images

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
ITMI971395 1997-06-12
IT97MI001395A IT1292152B1 (it) 1997-06-12 1997-06-12 Proiettore per veicoli a motore con lampada bifilamento

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

Similar Documents

Publication Publication Date Title
US6416210B1 (en) Headlamp for a vehicle
US4772987A (en) Headlight for antifog lamp for automotive vehicles
JP3964089B2 (ja) 車両用前照灯
US6402355B1 (en) Vehicular headlamp having improved low-beam illumination
US4862329A (en) Vehicular headlamp
US4972307A (en) Structure of headlamps for vehicles
US4225903A (en) Motor vehicle headlight for low and high beams
JPS61245401A (ja) 楕円面反射器と放物面反射器とを組合わせた自動車用主ビ−ム前照灯
US4029985A (en) Rectangular headlamp filament shield
EP0579184B1 (de) Scheinwerfer für Kraftfahrzeuge
EP0884522B1 (de) Kraftfahrzeugscheinwerfer mit einer Zweifadenlampe
GB2254684A (en) Headlamp unit for vehicles
EP0106616B1 (de) Scheinwerfer für Strassenfahrzeuge
US5003447A (en) Lamp reflector
JP4009392B2 (ja) 車両用前照灯
US4520433A (en) Motor vehicle headlamp
JP2558793Y2 (ja) 車両用前照灯
JP2517383B2 (ja) 車輌用前照灯
JPH01159902A (ja) 自動車用前照灯
EP0096785A1 (de) Abgestutzter Fahrzeugscheinwerfer
JPH0418406B2 (de)
JPS638002Y2 (de)
JPS6026401Y2 (ja) 車両用ヘツドランプ
KR20000069303A (ko) 자동차용 전조등
JP2517384B2 (ja) 車輌用前照灯

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): AT BE CH DE ES FR GB GR IT LI NL PT

AX Request for extension of the european patent

Free format text: AL;LT;LV;MK;RO;SI

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

AX Request for extension of the european patent

Free format text: AL;LT;LV;MK;RO;SI

17P Request for examination filed

Effective date: 20010223

AKX Designation fees paid

Free format text: AT BE CH DE ES FR GB GR IT LI NL PT

17Q First examination report despatched

Effective date: 20040816

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE CH DE ES FR GB GR IT LI NL PT

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20051116

Ref country code: LI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20051116

Ref country code: CH

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20051116

Ref country code: BE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20051116

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

RIC1 Information provided on ipc code assigned before grant

Ipc: 7F 21S 8/10 A

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REF Corresponds to:

Ref document number: 69832327

Country of ref document: DE

Date of ref document: 20051222

Kind code of ref document: P

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20060216

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20060216

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20060417

NLV1 Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act
REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2253791

Country of ref document: ES

Kind code of ref document: T3

ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

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

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20060817

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20060216

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: ES

Payment date: 20070129

Year of fee payment: 10

Ref country code: AT

Payment date: 20070129

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20070131

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20061229

Year of fee payment: 10

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20080801

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20080112

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20081029

REG Reference to a national code

Ref country code: ES

Ref legal event code: FD2A

Effective date: 20080114

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20080131

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20080114

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20080112

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IT

Payment date: 20161202

Year of fee payment: 20