EP0258116B1 - Projecteur croisement-route à deux filaments transversaux pour véhicule automobile - Google Patents

Projecteur croisement-route à deux filaments transversaux pour véhicule automobile Download PDF

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Publication number
EP0258116B1
EP0258116B1 EP87401811A EP87401811A EP0258116B1 EP 0258116 B1 EP0258116 B1 EP 0258116B1 EP 87401811 A EP87401811 A EP 87401811A EP 87401811 A EP87401811 A EP 87401811A EP 0258116 B1 EP0258116 B1 EP 0258116B1
Authority
EP
European Patent Office
Prior art keywords
axis
reflector
beam filament
dipped beam
headlamp
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
EP87401811A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0258116A1 (fr
Inventor
Bernard Luciani
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.)
Valeo Vision SAS
Original Assignee
Valeo Vision SAS
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 Valeo Vision SAS filed Critical Valeo Vision SAS
Publication of EP0258116A1 publication Critical patent/EP0258116A1/fr
Application granted granted Critical
Publication of EP0258116B1 publication Critical patent/EP0258116B1/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
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/32—Optical layout thereof
    • F21S41/323—Optical layout thereof the reflector having two perpendicular cross sections having regular geometrical curves of a distinct nature
    • 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
    • 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
    • F21S41/17—Discharge light sources
    • F21S41/173—Fluorescent light sources

Definitions

  • the present invention relates to a headlight for a motor vehicle making it possible to fulfill the crossing illumination function and the road illumination function.
  • It relates more particularly to a headlamp in which the crossing light beam is located below a cut defined by two horizontal half-planes slightly offset in height relative to each other.
  • the cutoff profile is defined approximately, on a standardized projection screen, by two horizontal half-lines located on either side of the projector axis, the half-line on the right side being at the level of the horizon and the half-line on the left side being offset by approximately 1.5% below the horizon.
  • the region or the maximum illumination (spot of concentration) must be shifted to the right relative to the axis of the projector.
  • the light beam of the road function it must include a spot of concentration approximately centered on the axis of the road.
  • cross-beam headlamps of this type comprise for the most part a lamp with two horizontal filaments oriented transversely with respect to the axis of the headlamp and offset from each other in two directions perpendicular to the 'axis of the projector, namely laterally and vertically.
  • the current solution consists in providing a reflector in the form of a paraboloid of revolution, the focus of which is located at vertically above the two filaments, and halfway between them A beam is thus obtained, for the crossing function, located mainly below a horizontal cut, with a spot of concentration centered approximately on the axis of the road.
  • the small thickness which it is desired to give to the beam in the vertical direction, before it passes through the closing glass, again in order to avoid providing on the closing glass streaks of vertical deflection with large thickness leads to the use a relatively large parabolic reflector.
  • the increase in the focal distance, for a reflector of determined contours results in a notable reduction in the recovery of the light flux emitted by the filaments, that is to say a decrease in the light output.
  • the present invention aims to overcome the drawbacks of the prior art and to propose a cross-beam headlamp in which none, or essentially no vertical deflection of the light rays has to be effected by the closing glass, and in which the beam obtained meets the photometry conditions required in particular in the United States.
  • Another object of the present invention is to obtain light beams of relatively small thickness before their passage through the closing glass, without however significantly reducing the light output of the projector.
  • the invention relates to a dipped-beam headlamp for a motor vehicle, of the type comprising a lamp provided with a dipped filament and a transverse horizontal road filament, the two filaments being offset one with respect to the other in two directions perpendicular to the axis of the headlamp, a reflector, the axis of which passes between the two filaments and a closing lens comprising elements for lateral deflection of the passing and driving beams, and arranged so that the beam crossing point is located below a generally horizontal orientation cut-out, characterized in that the surface of the reflector is a surface without discontinuity which in itself forms low-level images of the crossing filament and of the route filament such that the length of the images necessarily inclined with respect to the horizontal is shorter than that of the images slightly inclined with respect to the horizontal, t ous the points of the images of the crossing filament being moreover situated below the said horizontal cut, so that the glass is slightly deviating in the vertical direction.
  • FIG. 1 represents a driving beam headlamp of the prior art, intended to selectively supply a passing beam and a driving beam in accordance with the regulations currently in force, in particular in the United States of America. It comprises a lamp comprising two filaments 1a and 1b which are arranged horizontally and transversely to the axis Ox of the projector.
  • the crossing filament 1a is offset upwards with respect to the axis Ox by a distance h / 2 and offset laterally so that its free left end is located at a distance d / 2 from the vertical plane xOz passing by the Ox axis.
  • Each filament has a length 2l and the filaments 1a and 1b have respective diameters 0 ⁇ a and 0 ⁇ b.
  • the road filament 1b is arranged symmetrically with the filament 1a with respect to the focal point F located on the axis Ox, the two filaments both extending in the same vertical transverse plane.
  • the projector of the prior art furthermore comprises a reflector 2 which is constituted by a paraboloid of revolution whose focal point F occupies the position shown.
  • the projector includes a closing glass.
  • FIG. 2 are illustrated, by two series of isocandela curves at infinity, respectively Ca and Cb, the illuminations provided when the crossing and driving filaments are lit individually, these illuminations being determined in the absence of the ice closing.
  • the spot of concentration Ta of the passing beam is correctly forecasted below the cut h ⁇ Hh and offset laterally to the right relative to the axis of the road (in the case of traffic with right).
  • the right of the vertical axis v ⁇ Hv there is a significant overflow of the passing beam above the right horizontal half-cut Hh.
  • this will lead to the provision on the closing glass of prisms or drawdowns of large thickness, which is disadvantageous because the spoils of these very thick prisms lead to light anomalies in the form of parasitic rays emanating from the projector towards high and likely to dazzle drivers of vehicles coming in front.
  • the main beam located mainly above the cut, must also be "worked” by the closing glass, in particular to effect a lateral distribution.
  • its spot of concentration is located relatively above the horizon h ⁇ Hh, which also leads to a slight downturning of the rays.
  • the dipped-beam headlamp of the present invention shown diagrammatically in FIGS. 3 to 5, comprises a lamp (not shown) provided with two filaments 10a and 10b whose mutual positions are as described above, that is to say that it is the same standard lamp HB1 which is used, a reflector 20 with apex O and axis Ox and a lens 30 closing the projector.
  • the filaments 10a and 10b no longer occupy symmetrical positions with respect to the axis Ox of the reflector 20, but the lamp is shifted vertically so that the axis of the crossing filament 10a is located at a distance h a above the axis Ox and that the axis of the filament 10b is located at a distance h b below the Ox axis, with h a ⁇ h b .
  • the filaments are arranged in a vertical plane so as to be located vertically above a point F O located on the axis Ox.
  • the distance from the vertex O of the reflector to this point F o is denoted f o .
  • the position of the filaments may vary from the indications given above, without going beyond the ambit of the invention.
  • the surface of the reflector 20 is a surface without discontinuity, chosen so as to form images of the crossing filament 10a, all the points of which are located below a horizontal cut passing through the axis of the projector (denoted h'Hh on Figure 6).
  • all of these images have their highest point situated on the cut, or in the very close vicinity thereof.
  • the surface of the reflector 20 is also determined so that the photometry imposed for the driving beam is satisfied in particular in height (the lateral deflection of a centrally concentrated beam does not pose great difficulties in practice).
  • absence of discontinuity is meant continuity guaranteed at the first order at any point on the surface of the reflector, and at the second order at any point on the surface with the exception of two localized defects as explained below, manifested by very slight breaks in the curve.
  • a second order continuity means that, at any point on any line drawn on the surface, the tangent planes are the same on both sides of this line. This means in practice the absence of breaks on the surface.
  • the specific shape of the reflector 20 leads to a distribution of the images of the crossing filament 10a which is entirely appropriate.
  • all the images of this filament have their highest point aligned with the half-line Hh, or located in the very close vicinity of the latter, so as to define the corresponding half-cut with high quality, and that, moreover, there is no image of the crossing filament which extends in a generally vertical direction with great height.
  • the beam obtained, before it passes through the closing glass advantageously has a small thickness: not only the highest point of each image is located in the very close vicinity of the cut hh ⁇ , but also the lowest point of each image does not extend at great distance below this cut. This especially avoids lighting the road too close to the vehicle, which helped to make the large vertical images created by the parabolic reflector of the projector of Figure 1.
  • FIG. 6 represents, by two series of isocandela curves C ⁇ a and C ⁇ b of decreasing values from the inside towards the outside, the illuminations provided by the reflector in cooperation with the crossing filament 10a and with the route filament 10b, respectively.
  • the closing glass will be designed to ensure a slight lateral spread of the two beams.
  • elements priss or streaks for lateral deflection of the spot of concentration of the crossing beam to the left will be provided to define the left half-cut, shifted downward, of this beam.
  • the main beam will also be dispersed laterally to give it its wide width. But in all cases, a certain spreading being already obtained by the very nature of the reflector, there will be no need to provide prisms or streaks of great thickness on the closing glass: it will therefore be easy to mold , whether made of glass or plastic, and in addition no rising stray ray will be generated by the spoils of these prisms.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)
EP87401811A 1986-08-04 1987-08-04 Projecteur croisement-route à deux filaments transversaux pour véhicule automobile Expired - Lifetime EP0258116B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8611265A FR2602306B1 (fr) 1986-08-04 1986-08-04 Projecteur croisement-route a deux filaments transversaux pour vehicule automobile
FR8611265 1986-08-04

Publications (2)

Publication Number Publication Date
EP0258116A1 EP0258116A1 (fr) 1988-03-02
EP0258116B1 true EP0258116B1 (fr) 1991-02-27

Family

ID=9338008

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87401811A Expired - Lifetime EP0258116B1 (fr) 1986-08-04 1987-08-04 Projecteur croisement-route à deux filaments transversaux pour véhicule automobile

Country Status (5)

Country Link
US (1) US4794493A (ja)
EP (1) EP0258116B1 (ja)
JP (1) JP2631981B2 (ja)
DE (1) DE3768181D1 (ja)
FR (1) FR2602306B1 (ja)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5365412A (en) * 1993-01-07 1994-11-15 Ford Motor Company Low profile illuminator
US5471371A (en) * 1993-01-08 1995-11-28 Ford Motor Company High efficiency illuminator
US5434754A (en) * 1993-12-27 1995-07-18 Ford Motor Company Light manifold
FR2774150B1 (fr) 1998-01-28 2000-04-14 Valeo Vision Projecteur a source transversale pour vehicule automobile, susceptilble d'emettre un faisceau a coupure nette
FR2774151B1 (fr) 1998-01-28 2000-04-14 Valeo Vision Projecteur de vehicule automobile a source lumineuse virtuelle
FR2774149B1 (fr) 1998-01-28 2000-04-14 Valeo Vision Projecteur de vehicule automobile, comportant une source transversale et apte a engendrer un faisceau a coupure non rectiligne
FR2775057B1 (fr) 1998-02-17 2000-05-05 Valeo Vision Projecteur a source transversale pour vehicule automobile, avec un moyen d'occultation de la lumiere directe
FR2804495B1 (fr) 2000-01-31 2002-06-07 Valeo Vision Projecteur de vehicule automobile, comportant une source transversale et apte a engendrer un faisceau a coupure non rectiligne
FR2819042B1 (fr) 2000-12-28 2003-03-14 Valeo Vision Projecteur pour vehicule, comprenant un reflecteur et une source lumineuse horizontale orientee transversalement a un axe optique du reflecteur

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1319105A (fr) * 1961-04-04 1963-02-22 Philips Nv Projecteur pour véhicules à moteur
FR1309130A (fr) * 1962-01-05 1962-11-09 Philips Nv Phare d'automobile
US4246631A (en) * 1978-05-23 1981-01-20 Lucas Industries Limited Vehicle headlamp
US4303965A (en) * 1978-10-16 1981-12-01 Westinghouse Electric Corp. Single-mode vehicular headlamp system
US4520433A (en) * 1982-06-09 1985-05-28 General Electric Company Motor vehicle headlamp
FR2566878B1 (fr) * 1984-06-27 1986-07-18 Cibie Projecteurs Perfectionnements aux projecteurs automobiles emettant un faisceau coupe, notamment un faisceau de croisement
DE3515493A1 (de) * 1985-04-30 1986-10-30 Robert Bosch Gmbh, 7000 Stuttgart Scheinwerfer fuer abblendlicht oder nebellicht von kraftfahrzeugen

Also Published As

Publication number Publication date
EP0258116A1 (fr) 1988-03-02
FR2602306B1 (fr) 1988-11-10
DE3768181D1 (de) 1991-04-04
US4794493A (en) 1988-12-27
FR2602306A1 (fr) 1988-02-05
JP2631981B2 (ja) 1997-07-16
JPS6343202A (ja) 1988-02-24

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