EP0250313B1 - Projecteur additionnel à un projecteur de croisement pour véhicule automobile - Google Patents

Projecteur additionnel à un projecteur de croisement pour véhicule automobile Download PDF

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Publication number
EP0250313B1
EP0250313B1 EP87401347A EP87401347A EP0250313B1 EP 0250313 B1 EP0250313 B1 EP 0250313B1 EP 87401347 A EP87401347 A EP 87401347A EP 87401347 A EP87401347 A EP 87401347A EP 0250313 B1 EP0250313 B1 EP 0250313B1
Authority
EP
European Patent Office
Prior art keywords
sectors
filament
reflector
headlight
axis
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
EP87401347A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0250313A1 (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
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Filing date
Publication date
Application filed by Valeo Vision SAS filed Critical Valeo Vision SAS
Publication of EP0250313A1 publication Critical patent/EP0250313A1/fr
Application granted granted Critical
Publication of EP0250313B1 publication Critical patent/EP0250313B1/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
    • F21S41/33—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
    • F21S41/335—Multi-surface reflectors, e.g. reflectors with facets or reflectors with portions of different curvature the reflector consisting of patch like sectors with continuity at the junction between adjacent areas

Definitions

  • the present invention relates to an additional headlamp for a motor vehicle capable of providing a light beam such that, when it is juxtaposed with a passing beam, a beam is obtained which meets the standards for the illumination of driving beams.
  • a specific advantage of this kind of solution is that, during the night circulation, the lamp of the dipped beam remains on permanently, which avoids fatigue, and the inherent decrease in the life of its filament, usually due to repeated switching on and off when switching to high beam.
  • French patent 1,393,430 describes a certain number of embodiments of complementary projectors of this type.
  • the specific design of the filament, the occulting elements and vertical deflection streaks provided on the closing glass makes it possible to obtain a beam which is effectively essentially complementary to a European type passing beam as mentioned below.
  • the present invention aims to alleviate or eliminate these drawbacks of the beam projectors of the prior art, and aims in particular to provide one.
  • additional headlamp which does not include any element for occulting the luminous flux emitted by the filament, in favor of the luminous efficiency obtained, the closing glass of which essentially comprises only prisms effecting a slight horizontal deflection of a determined part of the light rays, and, in one embodiment, the reflector is easy to produce by molding.
  • the object of the invention is to define an additional headlamp which provides a beam which is essentially complementary to this passing beam, that is to say located mainly above the cut-off of the passing beam.
  • the invention relates to an additional projector whose reflector is able to bring all the images of its axial filament substantially above the horizontal h 'Hh.
  • FIGS. 2 and 3 An example of such a projector is shown diagrammatically in FIGS. 2 and 3. It comprises a lamp equipped with a cylindrical filament 100 disposed axially, a reflector or mirror 200 and a closing glass 300.
  • the filament 100 does not have a cup occultation, cup which is generally provided when it is desired to create a beam delimited by a given cut. It therefore emits freely all around it.
  • the dipped headlights frequently have their inclined axis, about 1%, below the horizontal.
  • the filament 100 will be shifted down a small distance, to straighten all of its images up, and thus compensate for the shift down due to the tilt of the projector.
  • the filament will however remain parallel to the axis of the reflector.
  • the reflector 200 is designed, from the point of view of its geometry, so that all the images of the filament which it creates are located either in the vicinity of the axis of the projector, that is to say in the vicinity of the point H defined by the intersection of said axis of the projector with the screen, and which constitutes the reference center of the latter, ie above a horizontal cut defined by the horizon h'Hh, cut below which is located most of the light concentration obtained with a passing beam. (The 15 ° inclination of the right half Hc of the cut is neglected here.
  • the reflector firstly comprises two sectors 201 and 202 intended to create a concentration of images in the vicinity of the center H of the screen. These sectors are arranged symmetrically with respect to the axis Ox of the reflector, O representing the top of said reflector, and are delimited by two planes inclined at the same angle a on either side of the horizontal plane xOy, around the Ox axis. This angle a is preferably less than 45 ° .
  • Each sector 201, 202 has the shape of a portion of paraboloid whose focal point F o (see FIG. 2) is located in the middle of the filament 100 in the axial direction. These sectors therefore have the equation: where f o is the focal distance of the two portions of paraboloids and corresponds to the focal point F o represented in FIG. 2, and is therefore chosen equal to the distance from the origin O to the center of the filament 100.
  • FIG. 4 represents, in the screen normalized to 25 meters, the images of the filament projected by these sectors of the reflector 200.
  • a spot of concentration (superposition of the greatest number of images) is obtained in the region of the center H, and said images all have an orientation between - a and + a with respect to the horizontal h 'Hh.
  • the reflector 200 further comprises four other sectors 203 to 206, grouped in pairs respectively in the upper and lower regions of the reflector.
  • the shape of these sectors which will be defined with precision by a mathematical approach thereafter, is designed to generate on the projection screen images of the filament having all their center located above the horizontal h 'Hh.
  • ⁇ F B is a parameter representative of the offset of the center of the images of the filament relative to the center H of the normalized screen and is preferably approximately equal to f H.
  • FIGS. 5 and 6 are views of the screen normalized to 25 meters representing the images of a centered filament projected respectively by the sectors 203 and 205 as defined mathematically above. As we can see, the centers of these filament images are all located above the horizontal h 'Hh of the screen, and thus define a spot of concentration situated slightly above this horizontal.
  • the angle a is modified, the inclination limits of the images centered at the point H obtained with the sectors 201 and 202 of the reflector are varied.
  • the smaller the angle a the more the images will be flattened, and vice versa.
  • the light intensity (or number of images) of the concentration spot obtained with sectors 201 and 202 is proportional to the surface of said sectors, and therefore to the value of the angle a.
  • the more the value of the angle a increases the more the maximum inclination of the images of the filament relative to the horizontal also increases, which amounts to proportionally increasing the number of images whose lowest point is well below the horizontal axis. This is not desirable because the complementary character of the beam obtained is then degraded.
  • the parameters 6 t H and A f B which can be equal to each other, make it possible to control the way in which the images are deployed above the horizontal axis as illustrated in FIGS. 6 and 7 Thus, it is understood that the centers of the images of the filament generated by the corresponding zone of the reflector move away more quickly from the center H of the screen as one and / or the other of these parameters increases. . This results in a reduction in the light intensity created by these areas in the vicinity of the axis of the road.
  • FIGS. 7 to 9 the headlamp illumination curves shown in FIGS. 7 and 9 are obtained not with the headlamp structure as shown in FIGS. 2 and 3, but with a projector whose filament is, as envisaged above, vertically shifted downwards, the associated downward inclination of the whole of the projector (or only of the lamp-reflector assembly) not yet been performed.
  • FIG. 7 represents, by a set of isocandela curves Cn on a projection screen, the values of which decrease from inside to outside, the illumination provided by the offset filament lamp and the reflector 200 in the no closing glass.
  • FIG. 8 is a back view of a preferred closing glass for an additional projector according to the invention, whether it is of the centered filament type or of the offset filament type.
  • the closing glass 300 is divided into 16 zones 301 to 316 arranged as shown, this arrangement being to be considered as included in the present description.
  • the zones 301 and 302 are left non-deflecting (smooth) or slightly deflecting, this in order to keep the spot of light concentration obtained as indicated substantially intact. higher with said sectors. This preserves the luminous "point" towards the horizon which conventionally gives, for a driving beam, the desired visual comfort.
  • the zones 303 to 314, acting mainly on inclined images of the filament, include striations or the like to effect a slight horizontal deflection of the light rays. This gives a fairly wide range with an average level of lighting, which complements the light tip above.
  • zones 315 and 316 are strongly deviating, to give the beam its great width, while working on images of the filament which are rather oriented vertically.
  • FIG. 9 is represented, by a set of isocandela curves C ′ n whose values decrease from the inside towards the outside, the illumination provided by the projector described above equipped with the gla this of FIG. 8.
  • spot T ' the illumination provided by the projector described above equipped with the gla this of FIG. 8.
  • the surfaces 201 and 202 of the reflector of FIGS. 2 and 3 are unchanged, that is to say sectors of paraboloids with focal length f o . Their vertices are therefore located at point O as defined above, as shown in Figure 12.
  • the sectors 203 ′ to 206 ′ are defined by equations similar to those which define the sectors 203 to 206 of the first embodiment, but in which f o is replaced by a value fa less than f o .
  • the surfaces 203 ′ to 206 ′ closer to the filament 100, provide better recovery of the flux, while retaining their characteristics of distribution of the images of the filament as described above, these characteristics being specific to the equations defined above with regard to the sectors 203, 204 and 205, 206, respectively, regardless of the value of f o .
  • the focal distance f o of the dishes 201 and 202 greater than fô, makes it possible to increase the opening of the reflector without increasing its depth, thereby increasing the light intensity in the axis of the road.
  • the above has not taken into account the fact that, according to European standards, the right half of the cut-off of a passing beam is defined by a half-plane inclined at 15 ° with respect to the 'horizontal, while the lower cut proposed in the additional projector described above is essentially horizontal over its entire extent.
  • the additional headlight according to the invention can also be used in combination with cut-off headlights of any type, insofar as the latter is of generally horizontal orientation.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
EP87401347A 1986-06-17 1987-06-16 Projecteur additionnel à un projecteur de croisement pour véhicule automobile Expired - Lifetime EP0250313B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8608722 1986-06-17
FR8608722A FR2600024B1 (fr) 1986-06-17 1986-06-17 Projecteur additionnel a un projecteur de croisement pour vehicule automobile

Publications (2)

Publication Number Publication Date
EP0250313A1 EP0250313A1 (fr) 1987-12-23
EP0250313B1 true EP0250313B1 (fr) 1990-01-17

Family

ID=9336403

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87401347A Expired - Lifetime EP0250313B1 (fr) 1986-06-17 1987-06-16 Projecteur additionnel à un projecteur de croisement pour véhicule automobile

Country Status (7)

Country Link
US (1) US4841423A (ru)
EP (1) EP0250313B1 (ru)
JP (1) JP2559229B2 (ru)
BR (1) BR8702972A (ru)
DE (1) DE3761459D1 (ru)
FR (1) FR2600024B1 (ru)
SU (1) SU1524817A3 (ru)

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3808086A1 (de) * 1988-03-11 1989-09-28 Hella Kg Hueck & Co Reflektor fuer abgeblendete oder abblendbare kraftfahrzeugscheinwerfer
JPH0666121B2 (ja) * 1988-05-06 1994-08-24 スタンレー電気株式会社 車両用前照灯
DE68917198T2 (de) * 1988-05-09 1994-11-17 Ichikoh Industries Ltd Scheinwerfer für Kraftfahrzeuge.
JP2591094B2 (ja) * 1988-08-23 1997-03-19 市光工業株式会社 自動車用前照灯
JPH0658761B2 (ja) * 1988-11-08 1994-08-03 株式会社小糸製作所 前照灯用反射鏡
FR2639888B1 (fr) * 1988-12-07 1993-08-13 Valeo Vision Projecteur de vehicule automobile, comportant un reflecteur a surface complexe a zones intermediaires modifiees
JP2517485B2 (ja) * 1991-01-23 1996-07-24 株式会社小糸製作所 車輌用前照灯の反射鏡
US5303126A (en) * 1991-11-26 1994-04-12 Stanley Electric Co., Ltd. Headlight for irradiating light beam for a vehicle passing by in the opposite direction
JP2626864B2 (ja) * 1992-12-25 1997-07-02 株式会社小糸製作所 車輌用前照灯の反射鏡
JP2681588B2 (ja) * 1993-01-18 1997-11-26 株式会社小糸製作所 照明灯具の反射鏡
JP2813853B2 (ja) * 1993-06-03 1998-10-22 株式会社小糸製作所 車輌用灯具の反射鏡
DE69721459T2 (de) 1996-12-16 2004-02-26 Valeo Vision Fahrzeugscheinwerfer mit Einstelleinrichtung des Reflektors
FR2760067B1 (fr) * 1997-02-21 1999-05-14 Valeo Vision Projecteur de vehicule automobile a miroir a zones juxtaposees lateralement, et procede de fabrication d'un tel miroir
FR2779990B1 (fr) * 1998-06-19 2000-07-21 Saint Gobain Vitrage Vitrage en matiere plastique avec ajout de matiere plastique surmoule
FR2793000B1 (fr) * 1999-04-29 2001-08-03 Valeo Vision Projecteur bi-fonction a source unique et a optique fixe pour vehicule automobile
JP3926948B2 (ja) * 1999-08-19 2007-06-06 株式会社小糸製作所 車両用前照灯
FR2824513B1 (fr) * 2001-05-11 2003-07-25 Valeo Vision Dispositif d'eclairage en virage pour un vehicule automobile
GB2479142A (en) 2010-03-30 2011-10-05 Optovate Ltd Illumination Apparatus
JP5582865B2 (ja) * 2010-05-12 2014-09-03 株式会社小糸製作所 灯具

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3062951A (en) * 1956-01-16 1962-11-06 Gen Motors Corp Vehicle headlamp system
FR1393430A (fr) * 1964-02-08 1965-03-26 Projecteur à éclairage complémentaire de celui des projecteurs de croisement de véhicules automobiles pour l'obtention d'un éclairage de route
DE3027774A1 (de) * 1980-07-22 1982-02-18 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH, 8000 München Reflektor zur ausleuchtung einer flaeche
DE3139943A1 (de) * 1981-09-29 1983-04-14 Robert Bosch Gmbh, 7000 Stuttgart Scheinwerfer, insbesondere scheinwerfer fuer kraftfahrzeuge
JPS5868801A (ja) * 1981-09-29 1983-04-23 ロ−ベルト・ボツシユ・ゲゼルシヤフト・ミツト・ベシユレンクテル・ハフツング 前照灯
FR2536502B1 (fr) * 1982-11-19 1987-01-09 Cibie Projecteurs Projecteur de croisement pour vehicule automobile
DE3340462C1 (de) * 1983-11-09 1985-04-18 Westfälische Metall Industrie KG Hueck & Co, 4780 Lippstadt Abgeblendeter Fahrzeugscheinwerfer

Also Published As

Publication number Publication date
JPS632201A (ja) 1988-01-07
FR2600024B1 (fr) 1988-10-21
BR8702972A (pt) 1988-03-08
DE3761459D1 (de) 1990-02-22
FR2600024A1 (fr) 1987-12-18
SU1524817A3 (ru) 1989-11-23
EP0250313A1 (fr) 1987-12-23
US4841423A (en) 1989-06-20
JP2559229B2 (ja) 1996-12-04

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