EP0312442A1 - Fernlicht-Kraftfahrzeug-Scheinwerfer mit geringer Höhe und mit grosser Ausnutzung des Lichts - Google Patents

Fernlicht-Kraftfahrzeug-Scheinwerfer mit geringer Höhe und mit grosser Ausnutzung des Lichts Download PDF

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Publication number
EP0312442A1
EP0312442A1 EP88402564A EP88402564A EP0312442A1 EP 0312442 A1 EP0312442 A1 EP 0312442A1 EP 88402564 A EP88402564 A EP 88402564A EP 88402564 A EP88402564 A EP 88402564A EP 0312442 A1 EP0312442 A1 EP 0312442A1
Authority
EP
European Patent Office
Prior art keywords
reflector
projector
vertical
height
light source
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.)
Granted
Application number
EP88402564A
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English (en)
French (fr)
Other versions
EP0312442B1 (de
Inventor
Eric Blusseau
Norbert Brun
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
Cibie Projecteurs SA
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 Cibie Projecteurs SA, Valeo Vision SAS filed Critical Cibie Projecteurs SA
Publication of EP0312442A1 publication Critical patent/EP0312442A1/de
Application granted granted Critical
Publication of EP0312442B1 publication Critical patent/EP0312442B1/de
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
    • F21S41/10—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
    • 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
    • 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
    • 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
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/28—Cover glass
    • 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
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/285—Refractors, transparent cover plates, light guides or filters not provided in groups F21S41/24 - F21S41/2805
    • 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
    • F21S41/321—Optical layout thereof the reflector being a surface of revolution or a planar surface, e.g. truncated
    • 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
    • F21S41/30—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
    • 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
    • F21S41/331—Multi-surface reflectors, e.g. reflectors with facets or reflectors with portions of different curvature the reflector consisting of complete annular areas
    • F21S41/333—Multi-surface reflectors, e.g. reflectors with facets or reflectors with portions of different curvature the reflector consisting of complete annular areas with discontinuity at the junction between adjacent areas
    • 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
    • F21S41/336—Multi-surface reflectors, e.g. reflectors with facets or reflectors with portions of different curvature the reflector consisting of patch like sectors with discontinuity at the junction between adjacent areas

Definitions

  • the present invention relates in general to road headlights for motor vehicles, and in particular relates to a road headlight having a low height, which makes it possible to obtain good recovery of the light flux emitted by the lamp, and which forms, upstream of the closing glass, a light distribution particularly well suited to the desired light function.
  • a well-known solution to this problem consists in using a projector which, optically, is conventional and includes a lamp whose filament (or other source) is focused in a reflector in the form of a paraboloid of revolution, as well as a closing glass, and to truncate the reflector by two upper and lower flat cheeks.
  • the present invention aims to overcome the drawbacks of the prior art and to propose a headlamp capable of emitting a driving beam which, while being of a very reduced height to meet the most recent design requirements, offers a beam of high light intensity thanks to good recovery of the flux emitted by the source.
  • Another object of the invention is to give the images of the filament formed by the reflector an orientation particularly suited to the formation of a driving beam. It may be recalled in this regard that the visual comfort of a driving beam is given on the one hand, by a peak of concentration in the axis of the road (that is to say the optical axis of the headlamp) and on the other hand, by a large width and a small thickness of the beam.
  • the invention also aims to ensure that a high proportion of the images of the filament participating in the formation of the beam are horizontal or slightly inclined.
  • the present invention relates to a headlamp for a motor vehicle, of the type comprising a light source, a reflector defining an optical axis and a closing glass, characterized in that: the reflector comprises a bottom portion substantially in the form of a paraboloid of revolution focused on the source and edge portions in the form of parabolic cylinders with vertical generator, -
  • the projector further comprises deflecting means extending near the source, substantially over the entire height of the projector, and capable of deflecting the light rays from the source in their direction to re-emit them in a substantially horizontal direction towards said edge parts of the reflector, which reflects them in a direction essentially parallel to the optical axis so that they thus participate in the formation of the driving beam.
  • the light source is an elongated filament oriented along the optical axis.
  • the bottom part of the reflector extends forward to the vertical plane perpendicular to the optical axis and passing through the light source.
  • the deflecting means in projection in a horizontal plane, occupy on either side of the optical axis, relative to the light source, an angular interval substantially equal to the interval angular occupied by the edge parts of the reflector, and the rays re-emitted by the edge parts of the reflector are contained in the respective vertical planes containing the incident rays.
  • the deflecting means comprise two toric lens elements centered on the light source and extending over the entire height of the reflector, and each constituted by a succession of stepped deflecting prisms.
  • the deflecting means include: - two toric lens elements centered on the light source and occupying an intermediate part of the height of the headlight, and constituted by a succession of stepped deflecting prisms, and - two pairs of auxiliary reflectors in the form of toroidal paraboloids with a vertical axis of rotation passing through the source and occupying, respectively above and below the toric lens elements, the rest of the height of the projector.
  • the edge parts of the reflector are parts of a parabolic cylinder with vertical generator having for focal line a vertical line passing through the light source, and the toric lens elements and the two pairs of auxiliary reflectors each occupy about a third of the height of the projector.
  • the deflecting means comprise: a toric lens element centered on the light source, extending over approximately 180 ° in front thereof and occupying an intermediate part of the height of the reflector, said element being constituted by a succession of stepped deflecting prisms, and - two pairs of auxiliary reflectors in the form of parabolic cylinders with horizontal generatrix parallel to the optical axis, having the same focal line merged with said optical axis and occupying, respectively above and below the toric lens element, the rest of the height of the headlamp, and the edge parts of the reflector include: - at the height of said toric lens element, two parts of a parabolic cylinder with vertical generator having a vertical line passing through the light source as its focal line, and - above and below said two parts and respectively at the height of the two pairs of auxiliary reflectors, parts of two parabolic cylinders with vertical generator having for respective focal lines vertical lines situated on either side of the source luminous, at distance
  • a headlamp according to a first aspect of the present invention comprises a lamp 100, a complex reflector, generally indicated in 200, refractive deflection means 300 as well as a front closing glass 400.
  • the lamp 100 is provided with a filament 102 which will be considered at first approximation as cylindrical, disposed axially on the optical axis x-x of the projector.
  • the reflector 200 firstly comprises a bottom portion 210 which is in the form of a paraboloid of revolution, the focus of which F1 is located approximately in the center of the filament 102, on the axis x-x.
  • the ratio between its focal length and the total height of the reflector is of the order of 1: 4, for the purposes explained below.
  • the reflector 210 extends forward to the vertical plane perpendicular to the optical axis xx and passing through the center of the filament 102, as indicated by the lateral traces in the form of arcs of circle centered on said filament shown in FIG. 2.
  • the bottom reflector 210 is, however, extended forward, being delimited at the top and bottom by the two horizontal planes between which the projector is contained. These extensions are indicated at 212. In this way, the bottom reflector 210 covers the entire light field emitted by the filament 102 towards the rear, and even more.
  • the reflector further comprises two edge parts 222, 224 which cooperate with the deflecting means 300.
  • the deflecting means consist of two toric fresnel lens elements with vertical axis, respectively 302, 304, focused on the center of the filament 102 and comprising on their inner surface deviating prisms staggered in succession contained in respective horizontal planes.
  • the deflecting prisms can alternately be formed on the outer surface of the lenses 302, 304.
  • volume or "toric" surface is meant a volume or surface generated by the rotation of a plane circumference, and by extension of any plane curve, around an axis contained in the plane of the circumference or curve.
  • the two corresponding edge reflectors 222, 224 consist of two symmetrical parts of the same parabolic cylinder with vertical generator, focused on a vertical focal line passing through the center of the filament 102 (line F2 in FIGS. 2 and 4), and having as a plane / axis the vertical plane passing through the optical axis xx.
  • each toric lens and the associated edge reflector cover the same angular interval of the light field of the filament. More precisely, this interval begins at the level of the line transverse to the optical axis xx, which corresponds to the transition with the bottom reflector 210, and ends at an angle ⁇ defined by the position of the extreme lateral edge of the part 222 or 224 of the reflector 220 relative to the filament.
  • each toric lens 302, 304 is substantially interrupted at the level of the straight line joining said extreme edge of the associated reflector part 222, 224 to the filament 102.
  • the closing glass 400 may include prisms or vertical striations slightly deflecting making it possible to perform a slight lateral spreading of the beam.
  • the headlamp described above behaves optically as follows.
  • the filament 102 and the bottom reflector 210 generate, in a conventional manner, a beam of rays parallel to the optical axis, of relatively high intensity (rays R1 in FIGS. 1 to 4).
  • the light rays coming from the filament in the direction of a lens 302 or 304 are folded by the latter, the deflection taking place in a vertical plane, to propagate horizontally in the direction of the associated edge reflector 222 or 224. Since, by the very definition of the toric lens considered, the ray thus deflected has the virtual origin of the vertical focal line F2 of this reflector, it is therefore reflected by the latter in order to propagate after reflection in a horizontal direction substantially parallel to the optical axis Ox (rays R rayons on the forms 1 to 4).
  • the extension parts 212 of the bottom reflector 210 are defined on the basis of a double concern.
  • the bottom reflector thus designed does not obscure any of the light rays intended to be taken up by the toric lenses 302 and 304, the extensions 212 located on the same side defining between them a kind of window for these rays ( see in particular figure 4).
  • such a reflector optimally covers the rectangular area reserved for the beam coming from this reflector, area which is defined by the free space existing on the one hand, between the vertical anterior edges of the lenses 302 and 304 and d
  • the upper and lower horizontal limits of the projector as clearly shown in Figure 2.
  • a high beam headlamp as described above offers a recovery of the luminous flux emitted by the filament which is much higher than that of a truncated paraboloid headlamp of the prior art.
  • the strongly rising or falling rays such as the ray R (FIG. 2), which in the front projector would meet the upper or lower cheek of the reflector and would therefore be lost, are here largely recovered by one of the lenses 302 and 304 and returned to the corresponding edge reflector to participate in the formation of the beam. Only the rays very strongly inclined beyond about 45 ° or directed substantially forward, that is to say not included in the angular intervals ⁇ , are not recovered.
  • the beam forming means constituted by the lenses 302 and 304 and the edge reflectors 222 and 224 generate images of the filament which are essentially horizontal or slightly inclined relative to the horizontal.
  • the lenses, which are arranged relatively laterally with respect to the filament form at their exit rays which correspond to images of the filament not very inclined, and the reflection on the parabolic cylinder 222 or 224 has the property of not accentuating this tilt.
  • the images of the filament have a predisposition to form a beam of road, which conventionally or does not wish to give an excessive thickness, in particular in order not to illuminate the road too close to the vehicle.
  • FIG. 5 to 8 There is shown in Figures 5 to 8 a headlamp according to a second aspect of the present invention.
  • the bottom reflector 210 which is again here in the form of a paraboloid of revolution focused approximately in the center of the filament 102, no longer has parts extending forward. Its outline is therefore ( Figures 6 and 8) a circle centered on the filament 102 and contained in the plane perpendicular to the optical axis x-x and passing through said filament.
  • the deflecting means 300 are composed of several elements, each occupying respectively about a third of the total height of the reflector.
  • the deflecting means consist of two toric lenses 302, 304 similar to those of the first embodiment of the invention, except for the fact that they occupy a reduced height in the headlight .
  • the deflecting means 300 further comprise, above and below the toric lenses, four auxiliary reflectors, respectively 312, 322, 314, 324, each of which has the property of reflecting the light rays so that after reflection they propagate horizontally in the vertical plane containing the incident ray (R3 rays).
  • auxiliary reflectors respectively 312, 322, 314, 324, each of which has the property of reflecting the light rays so that after reflection they propagate horizontally in the vertical plane containing the incident ray (R3 rays).
  • auxiliary reflectors respectively 312, 322, 314, 324, each of which has the property of reflecting the light rays so that after reflection they propagate horizontally in the vertical plane containing the incident ray (R3 rays).
  • auxiliary reflectors respectively 312, 322, 314, 324
  • each of the two reflectors 312, 322 and 314, 324, respectively, located on the same side belong to the same toroidal paraboloid, and the two toric paraboloids intersect each other at two points situated on the vertical line passing through the center of the filament, at the height of the upper and lower edges respectively of the toric lenses 302 and 304.
  • edge reflectors 222 and 224 are therefore two symmetrical parts of the same parabolic cylinder with horizontal generator, of focal line F2 and having the vertical plane incorporating for the axis plane the optical axis xx.
  • the different elements constituting the deflecting means projected in a horizontal plane, have an angular working range (angle ⁇ ) included for each side, between the line horizontal perpendicular to the optical axis xx and the right joining the filament 102 to the extreme edge of the cylindro-parabolic reflector considered.
  • optical behavior of such a projector is essentially similar to that of the embodiment of Figures 1 to 4 except that the deflecting means 300 see in their upper and lower regions toroidal reflective parabolic surfaces replace the toric refracting lenses of FIG. 1. This results in an increased recovery of the rays strongly inclined upward or downward emitted by the filament, of course in measurement, as is also the case for the first embodiment, where these radii are included in the angular range ⁇ mentioned above.
  • deflecting means 300 As regards the combination of deflecting means 300 / edge reflectors, it is possible, as in the second embodiment, to separate them into three distinct stages of heights which may be similar. The most apparent difference compared to this second embodiment is that the structural differences between the different stages manifest themselves this time also at the edge reflectors, as shown in particular in FIG. 12.
  • the deflecting means comprise a toric lens 306 similar in its design to the lenses 302, 304 of the preceding figures, but which extends angularly, in projection in a horizontal plane, on 180 ° in front of the source.
  • This lens 306 cooperates with homologous reflecting zones 222, 224 of the edge parts of the reflector, which are symmetrical parts of a parabolic cylinder with vertical generator as defined above.
  • the deflecting means comprise, on the upper and lower stages, auxiliary reflectors 312, 314 and 322, 324, respectively, which are in the form of parabolic cylinders. More precisely, each auxiliary reflector is defined by a horizontal generator, parallel to the optical axis xx, resting on a parabola contained in a vertical plane perpendicular to said optical axis, of horizontal axis and of focal point located approximately in the center of the filament 102.
  • the two upper and lower auxiliary reflectors located on the same side of the projector actually belong to the same parabolic cylinder, and the two parabolic cylinders, generating the four auxiliary reflectors, are symmetrical with respect to the longitudinal vertical plane of the reflector and are mutually truncate along central straight lines (reference D in FIG. 9) situated at the height of the upper and lower edges of the lens 306.
  • these parabolic cylinders defining part of the deflecting means 300 do not generate, as virtual source of the reflected rays, a straight line such as F2 (FIGS. 6 to 8), but generate each another vertical line, respectively F and F, which can be shown to be contained in the vertical plane passing through the center of the filament and perpendicular to the optical axis xx and offset laterally on the side opposite that of the auxiliary reflector considered .
  • the two parabolic cylinders generating the upper and lower parts of the deflecting means 300 create vis-à-vis the edge reflectors of the virtual sources in the form of vertical lines offset respectively on either side of the filament by an equal distance. approximately twice the focal length of said generators.
  • edge reflectors with regard to the upper and lower stages, are parabolic cylinders with vertical generator, of vertical plane-axis parallel to the optical axis xx, and focused respectively on the vertical focal lines F and F
  • the upper and lower edge reflectors designated by the references 232, 234 and 242, 244, associated respectively with the cylindrical-parabolic auxiliary reflectors 312, 314 and 322, 324 deflecting means 300, and the intermediate edge reflectors 222, 224 associated with the toric lens 306.
  • the projector described above has the following behavioral characteristics.
  • the auxiliary reflectors do not create practically any occultation of the beam created by the bottom reflector 210. Indeed, their characterization by a horizontal generator parallel to the emission axis xx results in the fact that the projector of their contours in the vertical plane of Figure 10 is reduced to their section as shown in the latter figure.
  • the rays coming from the filament towards any one of the constituent elements of the deflecting means 300 are first of all deflected by refraction (radius R2) or reflection (radius R3) to take a direction of horizontal propagation, then are taken up by the edge reflectors 222, 224, 232, 234, 242, 244 to be reflected in a direction essentially parallel to the optical axis.
  • this latter embodiment in addition to the optical characteristics common to the three embodiments described, this latter embodiment, as indicated above, has its toric lens extended in front of the filament.
  • the directed rays towards this lens and not taken up by the edge reflectors contribute to forming the part of large width and low height of the beam, over an angular extent of approximately 45 ° on either side of the optical axis (radius R4 on Figure 11).
  • FIG. 13 illustrates, in a projection plane perpendicular to the optical axis, the position of a certain number of images of the filament as they are generated by a part of the projector of FIGS. 9 to 12, devoid of its glass closure, and more particularly by the association of auxiliary reflectors forming part of the deflecting means 300 and the corresponding edge reflectors.
  • Example A the reflector of which consisted of a paraboloid truncated by upper and lower cheeks, with projectors designed respectively according to each of the three embodiments of the invention (samples nos. 1 to 3).
  • the dimensions of the outlet opening of the reflector were 80 mm ⁇ 200 mm, and the basic focal distance was of the order of 20 mm for each of them, ie a substantially identical depth of one projector to another.
  • the flux recovery was estimated by using the same lamp in each of the reflectors and by determining by calculation the solid angle for which the rays coming from the source were captured by the various elements of the optical system to participate in the formation of the beam.
  • FIG. 14 shows, in front view, an alternative embodiment of the bottom part 210 of the main reflector 200.
  • the bottom 210 comprises two lateral parts 213, 214 and two respectively upper and lower parts 215 and 216, delimited by two planes P1 and P2 inclined by the same angle ⁇ in two opposite directions on either side of the vertical axial plane of the projector. These four parts are focused on the filament or in its vicinity.
  • the lateral parts have a focal distance substantially equal to that of the lateral parts in the form of parabolic cylinders 222, 224 of the reflector, while the upper and lower parts 215, 216 have a focal distance which, as described above, is determined as a function of the height of the reflector, and more precisely equal to a quarter of this height.
  • the angle ⁇ which characterizes the transition between the various parts of this bottom reflector 210 is preferably determined as a function of the focal distance of the lateral parts 213 and 214 and of the height of the reflector, so that these parts do not extend beyond the upper and lower limits of said reflector. More precisely, the relation 4f.sin ⁇ h must be verified.
  • This bifocal configuration of the bottom reflector is advantageous because it allows the bottom reflector to extend laterally until the beginning of the lateral parabolic cylinders and in addition to present an optimal flux recovery at the top and at the bottom taking into account the height at which the reflector is limited.
  • the bottom reflector preferably had, at least in its upper and lower regions, a focal distance equal to a quarter of the height of the projector. This makes it possible in practice to give said reflector, when it is interrupted at the level of the transverse vertical plane passing through its focal point (by the filament), a height equal to that of the projector, as can easily be demonstrated.

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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)
EP88402564A 1987-10-13 1988-10-11 Fernlicht-Kraftfahrzeug-Scheinwerfer mit geringer Höhe und mit grosser Ausnutzung des Lichts Expired - Lifetime EP0312442B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8714114 1987-10-13
FR8714114A FR2621679B1 (fr) 1987-10-13 1987-10-13 Projecteur de route de faible hauteur a grande recuperation de flux pour vehicule automobile

Publications (2)

Publication Number Publication Date
EP0312442A1 true EP0312442A1 (de) 1989-04-19
EP0312442B1 EP0312442B1 (de) 1992-01-02

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EP88402564A Expired - Lifetime EP0312442B1 (de) 1987-10-13 1988-10-11 Fernlicht-Kraftfahrzeug-Scheinwerfer mit geringer Höhe und mit grosser Ausnutzung des Lichts

Country Status (6)

Country Link
US (1) US4899261A (de)
EP (1) EP0312442B1 (de)
JP (1) JP2622996B2 (de)
DE (1) DE3867416D1 (de)
ES (1) ES2029723T3 (de)
FR (1) FR2621679B1 (de)

Cited By (3)

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Publication number Priority date Publication date Assignee Title
EP0419730A1 (de) * 1988-05-06 1991-04-03 Stanley Electric Co., Ltd. Scheinwerfer für Kraftfahrzeuge
US5803576A (en) * 1995-01-19 1998-09-08 Valeo Vision Motor vehicle headlamp having dioptre lens means interposed between the light source and the reflector
EP1467143A1 (de) * 2003-04-08 2004-10-13 Valeo Vision Kfz-Scheinwerfer mit Mitteln zur horizontalen Aufweitung des Lichtsbündels

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JPH0270302U (de) * 1988-11-18 1990-05-29
US5077644A (en) * 1989-08-25 1991-12-31 Rayovac Corporation Reflector for hand held flashlight
JP2753914B2 (ja) * 1992-02-05 1998-05-20 株式会社小糸製作所 自動車用前照灯
CZ287690B6 (cs) * 1996-01-29 2001-01-17 Autopal S. R. O. Světlomet s komplexním reflektorem
CA2269026A1 (en) * 1996-10-18 1998-04-30 Walter Wadey & Co. Pty. Ltd. Flood light or luminaire construction
FR2772112B1 (fr) * 1997-12-05 2000-02-25 Valeo Vision Feu de signalisation a eclairement controle de plage eclairante, et procede de fabrication d'un ballon d'un tel feu
US6161946A (en) * 1998-11-09 2000-12-19 Bishop; Christopher B. Light reflector
JP2002093209A (ja) * 2000-09-11 2002-03-29 Koito Mfg Co Ltd 車両用灯具
US20050030759A1 (en) * 2003-08-04 2005-02-10 Guide Corporation Bifocal hyperbolic catadioptric collection system for an automotive lamp
US20070211471A1 (en) * 2003-10-27 2007-09-13 Wimberly Randal L Dual Reflector System
US7029150B2 (en) * 2004-01-23 2006-04-18 Guide Corporation Catadioptric light distribution system
JP2006049190A (ja) * 2004-08-06 2006-02-16 Koito Mfg Co Ltd 車両用前照灯
KR101273076B1 (ko) * 2011-09-29 2013-06-10 에스엘 주식회사 이중 반사부 구조
DE102013101344A1 (de) * 2013-02-12 2014-08-14 Hella Kgaa Hueck & Co. Optisches System für eine Beleuchtungsvorrichtung für Fahrzeuge
CN105698089B (zh) * 2016-03-14 2018-06-22 斯比夫（西安）照明技术有限公司 铁路机车室外照明用高聚光型反光镜
WO2018022454A1 (en) * 2016-07-23 2018-02-01 JST Performance, LLC Method and apparatus for subtending light downwardly

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FR674139A (fr) * 1928-04-27 1930-01-23 Projecteur pour véhicules automobiles
FR36397E (fr) * 1929-01-11 1930-05-10 Perfectionnements apportés aux phares d'automobiles non éblouissants
GB2164435A (en) * 1984-08-03 1986-03-19 Stanley Electric Co Ltd Headlamp for vehicle

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FR674139A (fr) * 1928-04-27 1930-01-23 Projecteur pour véhicules automobiles
FR36397E (fr) * 1929-01-11 1930-05-10 Perfectionnements apportés aux phares d'automobiles non éblouissants
GB2164435A (en) * 1984-08-03 1986-03-19 Stanley Electric Co Ltd Headlamp for vehicle

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Publication number Priority date Publication date Assignee Title
EP0419730A1 (de) * 1988-05-06 1991-04-03 Stanley Electric Co., Ltd. Scheinwerfer für Kraftfahrzeuge
US5803576A (en) * 1995-01-19 1998-09-08 Valeo Vision Motor vehicle headlamp having dioptre lens means interposed between the light source and the reflector
EP1467143A1 (de) * 2003-04-08 2004-10-13 Valeo Vision Kfz-Scheinwerfer mit Mitteln zur horizontalen Aufweitung des Lichtsbündels
FR2853718A1 (fr) * 2003-04-08 2004-10-15 Valeo Vision Projecteur d'eclairage pour vehicule automobile comportant des moyens pour etaler transversalement le faisceau lumineux

Also Published As

Publication number Publication date
FR2621679B1 (fr) 1990-02-09
EP0312442B1 (de) 1992-01-02
US4899261A (en) 1990-02-06
ES2029723T3 (es) 1992-09-01
FR2621679A1 (fr) 1989-04-14
JP2622996B2 (ja) 1997-06-25
JPH01132001A (ja) 1989-05-24
DE3867416D1 (de) 1992-02-13

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