EP0736726B1 - Kfz-Scheinwerfer, der ein durch 2 in der Höhe versetzte Ebenen begrenztes Lichtmuster erzeugt - Google Patents

Kfz-Scheinwerfer, der ein durch 2 in der Höhe versetzte Ebenen begrenztes Lichtmuster erzeugt Download PDF

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Publication number
EP0736726B1
EP0736726B1 EP96400725A EP96400725A EP0736726B1 EP 0736726 B1 EP0736726 B1 EP 0736726B1 EP 96400725 A EP96400725 A EP 96400725A EP 96400725 A EP96400725 A EP 96400725A EP 0736726 B1 EP0736726 B1 EP 0736726B1
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EP
European Patent Office
Prior art keywords
mirror
zone
base surface
cutoff
vertical
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
EP96400725A
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English (en)
French (fr)
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EP0736726A1 (de
Inventor
Kamislav Fadel
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
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Valeo Vision SAS
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Publication date
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Publication of EP0736726A1 publication Critical patent/EP0736726A1/de
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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
    • F21S41/337—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
    • 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 generally to a motor vehicle headlight, of the type capable to emit a cut beam conforming in particular to regulations of the United States of America, and identified by the American standard SAE J 579 C.
  • the cut is defined by two horizontal half-planes P1 and P2 shifted in height (the right half-plane being shifted upwards for a right-hand traffic direction), and by an oblique connection zone in the vicinity of the axis of the road.
  • the present invention aims to propose a new projector which allows to obtain a beam which at the same time corresponds to the cut of the aforementioned type and which, without the intervention of the closing glass, offers a wide important, while using a mirror whose reflective surface is continuous and preferably without slope breaks.
  • Another object is to achieve these objectives by achieving a beam of satisfactory homogeneity.
  • the present invention provides a projector for motor vehicle as defined in claim 1.
  • a motor vehicle headlamp comprising a mirror 20, which will be described in detail below, a lamp mounted in the bottom of the mirror and comprising a axial filament 10, and a closing glass 30.
  • the lamp is in this case a standard type lamp "9006", used in particular in the United States of America. His filament emits freely all around it, only a cover front of the lamp which obscures direct light.
  • the mirror is capable, on its own, of generating a beam delimited by a cut of the kind of that mentioned in the preamble to this description.
  • the mirror includes a first zone 21 which consists of a surface capable of generating filament 10 images which are all located below of a horizontal cut, and preferably whose highest points are located in the vicinity of this cut, and which at the same time brings these images to one side (in this case on the right side) of the vertical reference plane VV.
  • the images produced by the zone 21 are relatively small on the one hand small, and on the other hand reasonably slightly inclined by compared to the horizontal.
  • the surface 21 is capable of generating a relatively thin spot of concentration of laterally offset from the VV plane, under a horizontal half-cut.
  • the reflective surface of zone 21 is produced according to the equation indicated on page 5 of the document FR-A-2 583 139, or more preferably in accordance with to the equations on page 10 of document FR-A-2 599 120, these two documents being in the name of the Applicant.
  • the surface is subjected to horizontal tilting necessary to shift the beam to the right (for a right-hand traffic direction), this offset being a function of the width of the part of beam and corresponding to about half of this width.
  • the surface reflective is capable in itself of bringing light on the right side of the projection plane, and none tipping is not necessary.
  • zone 21 with a surface conforming to the second hypothesis, is illustrated by a set of isocandela curves in FIG. 3a. he has a generally straight cut at the HH horizon line, and is located immediately to the right of the vertical reference VV.
  • the reflective surface of zone 22, which occupies the bottom of the mirror and its side opposite to zone 21, is a surface capable of producing a beam of a width important and defining a horizontal cut. Of preferably, the highest points of the images of the filament generated are located in the vicinity of this cut.
  • this surface is produced in accordance with the equations mathematics given in document FR-A-2 639 888 (zones 210, 220 and 230 of FIG. 5), or preferably, in document FR-A-2 664 677 (zones 201, 202 and 203).
  • the part of the beam generated by the zone 22 is illustrated in Figure 3b.
  • the cut generated line is slightly lower, for example by 0.7 °, that the beam cut generated by the area 21.
  • the area 22 is tilted 1.5 ° downwards.
  • the parameters of these, and especially their basic focal length so that the intersection of the two surfaces, previously tilted one in relation to the other thanks to the adjustment of their equations, is located along a transition line, noted LT in Figure 1, which generally extends vertically between the top and bottom edges of the mirror 20.
  • LT transition line
  • the mirror has no continuity solution. It only presents a very slight bend at the LT transition line, this bend which can practically be eliminated during polishing operations of the mold piston used to realize the optically active side of the mirror.
  • the overall beam obtained is illustrated by isocandela curves in Figure 3c.
  • the closing glass of the projector can be practically devoid of amenities (streaks, prisms, ...) of deflection of light, and be smooth.
  • the mirror for left-hand traffic is the mirror image of the mirror for right-hand traffic.
  • the present invention also offers to make beams of the type mentioned, that is to say with two half-cuts offset in height and respectively for right-hand traffic and for left-hand traffic, performing the functions assigned to zones 21 and 22 of the embodiment of the Figures 1 and 2 using a specific streak of certain areas of the reflective surface.
  • a mirror 40 which is separate in three zones 41, 42 and 43.
  • the central zone 42 has, over its extent, the same surface as the central area 22 of the mirror 20 of the Figures 1 and 2 on the same extent.
  • the lateral zone 41 has a base surface identical to the reflective surface of zone 21 of Figures 1 and 2.
  • the lateral zone 43 presents a surface symmetrical to that of zone 41.
  • We realize so a mirror with a symmetrical base surface which will, as we will see below, resolve the problem discussed above with reference to Figures 5a and 5b.
  • the surfaces of zones 41, 42 and 43 are not tilted vertically relative to each other to others, that is to say that the horizontal cuts generated by these surfaces are aligned.
  • Figure 7a shows the light distribution which would be obtained with the base surface of zone 41. This distribution is naturally substantially identical to that of FIG. 3a.
  • Figure 7b shows the light distribution obtained with the surface of zone 42, which has large similarities to that illustrated in Figure 3b the fact that the area of area 42 corresponds to a substantial part of the surface of zone 22 of Figures 1 and 2.
  • FIG. 7c shows that, due to the symmetry areas 41 and 43, the light distribution which would be given by area 43 is symmetrical to that which would be given by zone 41.
  • the base surface described above is modified by appropriate striations, and more precisely by two types of striations in zones 41 and 43, so as to selectively obtain either a cutoff adapted to left-hand traffic direction (by example for Japan), a cut adapted to a direction traffic on the right (for example for the United States of America). In both cases, the central zone 42 remains smooth.
  • each streak S (M, N) is characterized on the one hand by radii of curvature R1 and R2 at the ends respectively upper and lower and secondly by two values of levels N1 and N2 at the ends compared to a base surface.
  • the mathematical method used for design the reflecting surface of the mirror from equations of the base surfaces of zones 41 and 43 and streak parameters will not be described in detail, simply an increase in the coordinate at x of each point of the equation, calculated as a function of the position of the point on the streak considered and streak parameters (height, width, radius of curvature and levels).
  • the levels of the streaks in zone 41 are therefore all zero, which means that none significant vertical shift is not suffered by the light.
  • the ten streaks S (14.1) to S (15.5) are inoperative (hatched area), i.e. they have been modeled with an infinite radius or that can be considered infinite.
  • the other streaks have radii of curvature which preferably vary between 20 and 40 mm, with a regular distribution for example on values of 20, 25, 30, 35 and 40 mm, for widths of the order of 3 to 5 mm.
  • Zone 43 includes, in the present example, a a number of streaks that do not work, as in the case of zone 41 (mainly streaks located in the lateral parts of zone 43). These streaks are indicated by tight hatching.
  • Zone 43 also includes a number of streaks with a fixed radius of curvature or evolutionary, which have the property of presenting a level to their upper end (relative to the surface of base) which is below their level at the end lower.
  • the streaks S (17,1) to S (30.1), S (21.2) to S (30.2), S (19.3) to S (30.3), S (20.4), S (29.4), S (30.4), S (29.5) and S (30.5) have this property.
  • the differences in levels between the top and bottom edges of each streak included preferably between 0.20 and 0.50 mm.
  • the streaks in area 43 have radii of curvature, fixed or progressive, which are preferably distributed in a range from 20 to 60 mm.
  • FIG. 9a illustrates the appearance of the part of beam generated with the region 41 of the striated mirror 40 as shown above. We observe that the beam is spread in width significantly, without damaging the horizontal cut, located at the horizon, produced by the surface which would be striated.
  • Figure 9b shows the beam portion generated with zone 43 of the ribbed mirror also as indicated. Due to the differences in level of the streaks between their upper and lower ends, the cut is offset upwards relative to that of FIG. 9a, and at the same time, a certain width is given to the beam. We also observe that, thanks to a judicious arrangement of the streaks, the cut off beam extends almost entirely to the left of the plane vertical vertical VV of the projection screen.
  • the beam generated by zones 41 and 43 is illustrated in Figure 9c. This shows that a beam with two half-cuts offset in height, with the half-cut on the left raised in relation to the half-cut of right (beam for left-hand traffic) is generated very satisfactorily.
  • the beam represented on the figure 9c will be further enriched by that of figure 7b, generated by the central zone 42, so it give an even greater width, for the benefit of visual comfort.
  • the dimension deviations along the X axis between the surface of the Figure 6 and the symmetrical surface will be a maximum of about 1 mm, value corresponding to the difference between the maximum level and the minimum level of the streaks, at which we add the deviations due to the convexity of streaks.
  • a mirror according to the invention can also be used with a "9007" type lamp characterized by two axial filaments intended to form a bundle of crossing and a beam of road.
  • a "9007" type lamp characterized by two axial filaments intended to form a bundle of crossing and a beam of road.

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  • 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)
  • Optical Elements Other Than Lenses (AREA)

Claims (7)

  1. Kraftfahrzeugscheinwerfer mit einer Lampe mit einer rundum ungehindert ausstrahlenden axialen Glühwendel (10), einem Reflektor (20; 40) und einer Abdeckscheibe (30), wobei der Reflektor im Zusammenwirken mit der Glühwendel ein Lichtbündel zu erzeugen vermag, das durch eine Hell-Dunkel-Grenze begrenzt wird, die im wesentlichen durch zwei in der Höhe versetzte und beiderseits einer vertikalen Bezugsebene (VV) gelegene Halbebenen gebildet wird,
    dadurch gekennzeichnet, daß er in einem ersten Bereich (21, 43) des Reflektors, der sich entlang eines seitlichen Randes des Reflektors über die gesamte Höhe erstreckt, eine reflektierende Oberfläche umfaßt, die ein konzentriertes Lichtbündel zu bilden vermag, das durch eine erste, im allgemeinen gerade horizontale Hell-Dunkel-Grenze begrenzt wird, die zur Gänze auf einer Seite dieser vertikalen Bezugsebene liegt, und in einem zweiten Bereich (22; 41, 42) des Reflektors, der sich an dessen Boden bis zum gegenüberliegenden seitlichen Rand erstreckt, eine reflektierende Oberfläche aufweist, die ein breites Lichtbündel zu erzeugen vermag, das durch eine zweite, im allgemeinen gerade horizontale Hell-Dunkel-Grenze begrenzt wird, und daß der Reflektor Einrichtungen (S(16,1)-S(30,5)) zur vertikalen Lichtbündelverschiebung umfaßt, die diese erste Hell-Dunkel-Grenze in Höhe der höchsten Halbebene der Hell-Dunkel-Grenze zu positionieren vermögen, und daß sich die zwei Bereiche in Höhe des Schnittpunktes der jeweiligen Oberflächen entlang einer durchgehenden, zwischen dem oberen und unteren Rand des Reflektor verlaufenden Linie (LT) kontinuierlich aneinander anschließen.
  2. Scheinwerfer nach Anspruch 1,
    dadurch gekennzeichnet, daß jede reflektierende Oberfläche Abbildungen der Glühwendel erzeugt, deren höchste Punkte in der Nähe der jeweiligen Hell-Dunkel-Grenze liegen.
  3. Scheinwerfer nach Anspruch 1 oder 2,
    dadurch gekennzeichnet, daß die Einrichtungen zur vertikalen Lichtbündelverschiebung darin bestehen, diesen ersten Bereich (21) in einem bestimmten vertikalen Winkel zu kippen.
  4. Scheinwerfer nach Anspruch 1 oder 2,
    dadurch gekennzeichnet, daß die Einrichtungen zur vertikalen Lichtbündelverschiebung eine Reihe Rillen (S(16,1)-S(30,5)) umfassen, die auf einer glatten Basisfläche des ersten Bereichs ausgebildet sind, wobei wenigstens ein Teil dieser Rillen zwischen ihrem oberen und ihrem unteren Ende bezüglich dieser Basisfläche höhenversetzt ist.
  5. Scheinwerfer nach Anspruch 4,
    dadurch gekennzeichnet, daß der Reflektor eine Gesamtbasisfläche umfaßt, gebildet durch eine erste Basisfläche (43) des ersten Bereichs, die Fläche (42) des zweiten Bereichs in Höhe des Reflektorbodens und eine zweite Basisfläche (41), die in bezug auf eine axiale Vertikalebene im wesentlichen symmetrisch zu dieser ersten Basisfläche ist, und daß eine erste Reihe Rillen (S(16,1)-S(30,5)) diese Einrichtungen zur vertikalen Lichtbündelverschiebung in Höhe der ersten oder zweiten Basisfläche und daß eine zweite Reihe Rillen (S(1,1)-S(15,5)) die Einrichtungen zur horizontalen Lichtbündelverschiebung in Höhe der zweiten oder ersten Basisfläche in der Weise bildet, daß die Lichtbündel für Rechts- und Linksverkehr mit ein und derselben Gesamtbasisfläche erzeugt werden können.
  6. Scheinwerfer nach Anspruch 5,
    dadurch gekennzeichnet, daß der Reflektor durch Gießen aus Kunststoff mit Hilfe einer Gußform hergestellt ist, die dieselbe Formmatrize (100) für Reflektoren für Links- und Rechtsverkehr aufweist.
  7. Scheinwerfer nach einem der Ansprüche 1 bis 6,
    dadurch gekennzeichnet, daß die Scheibe (30) glatt oder leicht ablenkend ist.
EP96400725A 1995-04-06 1996-04-04 Kfz-Scheinwerfer, der ein durch 2 in der Höhe versetzte Ebenen begrenztes Lichtmuster erzeugt Expired - Lifetime EP0736726B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9504109 1995-04-06
FR9504109A FR2732747B1 (fr) 1995-04-06 1995-04-06 Projecteur de vehicule automobile capable d'emettre un faisceau delimite par une coupure a deux demi-plans decales en hauteur

Publications (2)

Publication Number Publication Date
EP0736726A1 EP0736726A1 (de) 1996-10-09
EP0736726B1 true EP0736726B1 (de) 2002-06-26

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EP96400725A Expired - Lifetime EP0736726B1 (de) 1995-04-06 1996-04-04 Kfz-Scheinwerfer, der ein durch 2 in der Höhe versetzte Ebenen begrenztes Lichtmuster erzeugt

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US (1) US5651610A (de)
EP (1) EP0736726B1 (de)
JP (1) JPH0982122A (de)
DE (1) DE69621973T2 (de)
ES (1) ES2176412T3 (de)
FR (1) FR2732747B1 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2740858B1 (fr) * 1995-11-08 1998-01-23 Valeo Vision Projecteur de vehicule automobile, comportant un miroir capable d'engendrer par lui-meme un faisceau a coupure en v
FR2760070B1 (fr) * 1997-02-21 1999-05-28 Valeo Vision Projecteur comportant une lampe a deux filaments pour engendrer un faisceau coupe et un faisceau non coupe
FR2760068B1 (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
DE19843986B4 (de) * 1998-09-25 2012-02-23 Automotive Lighting Reutlingen Gmbh Scheinwerfer für Fahrzeuge

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0735309A1 (de) * 1995-03-31 1996-10-02 Valeo Vision Herstellungsverfahren eines Reflektors für Kfz-Scheinwerfer und Kfz-Schweinwerfer mit einem das Licht selektiv ablenkenden Reflektors

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2087317A5 (de) * 1970-05-14 1971-12-31 Cibie Projecteurs
US4481563A (en) * 1982-05-10 1984-11-06 Corning Glass Works Automotive headlight having optics in the reflector
FR2583139B1 (fr) * 1985-06-07 1989-02-03 Cibie Projecteurs Projecteur de croisement pour vehicule automobile
FR2609148B1 (fr) * 1986-12-30 1991-07-12 Cibie Projecteurs Projecteur de vehicule automobile comportant un reflecteur a surface complexe a fond modifie
JP2622564B2 (ja) * 1986-12-30 1997-06-18 ヴァレオ ヴイジョン カットオフによって限定されたビームを放射する、変形底部を有する自動車用前照灯
DE3731232A1 (de) * 1987-09-17 1989-03-30 Bosch Gmbh Robert Scheinwerfer fuer fahrzeuge, insbesondere scheinwerfer fuer kraftfahrzeuge
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
US5539629A (en) * 1995-05-04 1996-07-23 Ford Motor Company Multi-faceted light reflector for headlamp with facets having differentially tilted parabolic cylinders

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0735309A1 (de) * 1995-03-31 1996-10-02 Valeo Vision Herstellungsverfahren eines Reflektors für Kfz-Scheinwerfer und Kfz-Schweinwerfer mit einem das Licht selektiv ablenkenden Reflektors

Also Published As

Publication number Publication date
FR2732747A1 (fr) 1996-10-11
ES2176412T3 (es) 2002-12-01
FR2732747B1 (fr) 1997-06-20
DE69621973D1 (de) 2002-08-01
JPH0982122A (ja) 1997-03-28
EP0736726A1 (de) 1996-10-09
DE69621973T2 (de) 2003-03-13
US5651610A (en) 1997-07-29

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