EP0648968A1 - Signalleuchte für Kraftfahrzeuge mit einer Mehrzahl von Lichtquellen und mit einer optischer Zwischenscheibe - Google Patents

Signalleuchte für Kraftfahrzeuge mit einer Mehrzahl von Lichtquellen und mit einer optischer Zwischenscheibe Download PDF

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Publication number
EP0648968A1
EP0648968A1 EP94402291A EP94402291A EP0648968A1 EP 0648968 A1 EP0648968 A1 EP 0648968A1 EP 94402291 A EP94402291 A EP 94402291A EP 94402291 A EP94402291 A EP 94402291A EP 0648968 A1 EP0648968 A1 EP 0648968A1
Authority
EP
European Patent Office
Prior art keywords
light
sources
arrangements
flux
intermediate plate
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.)
Withdrawn
Application number
EP94402291A
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English (en)
French (fr)
Inventor
Dominique Montalan
Alain Coutin
Jean-Claude Gasquet
Jean-François Louy
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 EP0648968A1 publication Critical patent/EP0648968A1/de
Withdrawn legal-status Critical Current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
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/20—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by refractors, transparent cover plates, light guides or filters
    • F21S43/255—Filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/10—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source
    • F21S43/13—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source characterised by the type of light source
    • F21S43/14—Light emitting diodes [LED]

Definitions

  • the present invention relates generally to signaling lights for motor vehicles, and in particular to a signaling light for motor vehicle, of the type comprising a plurality of low-power light sources, a closing glass arranged in front of the sources and an intermediate plate comprising optical arrangements and arranged between the sources and the glass so as to obtain a desired photometry beam.
  • flux concentration elements such as Fresnel steps on the intermediate plate to the right of each source, and balls or the like for diffusing and spreading the flux on the inner face of the crystal.
  • Another known solution consists in providing the Fresnel steps on the inner face of the intermediate plate and the balls or the like on its outer face, in which case the glass is smooth on both of its faces.
  • the present invention is based on the discovery that effective optical behavior could also be obtained by first spreading or diffusing the beams generated by the sources, then by exposing the spread or scattered flux to a concentration treatment.
  • a difficulty of signaling lights comprising a large number of low power sources such as light-emitting diodes lies in that that it is difficult to obtain with type of source beams having a strong illumination both in the axis and in a substantially inclined manner with respect to this axis, and in particular rear fog beams.
  • the approval of such a beam requires significant levels of illumination both in the axis and in four points corresponding to four directions offset angularly to the left, to the right, above and below the axis.
  • the present invention also aims to propose an original solution to meet these criteria with a multi-source light such as a light emitting diode light.
  • the present invention relates, according to a first aspect, to a signaling light for a motor vehicle, of the type comprising a plurality of low power light sources, a closing glass disposed in front of the sources and an intermediate optical processing plate disposed between the sources and the lens, characterized in that said intermediate plate comprises, on its face facing the sources, arrangements arranged for spreading light flux and on its face facing the lens, arrangements for concentrating light flux.
  • the invention provides a signaling light for a motor vehicle, of the type comprising a plurality of low-power light sources, and a transparent optical treatment plate disposed in front of the sources, characterized in that said treatment plate optic comprises on its face turned towards the sources prismatic arrangements ordered for spreading light flux constituted by a network of grooves of "V" profile oriented in two essentially transverse directions and delimiting non-deviating zones with parallel faces, the grooves defining four privileged directions of light deflection.
  • the optical treatment plate is constituted either by an intermediate plate extending between the glass and the sources, or by the fire glass, in which case an intermediate plate is further provided comprising optical arrangements for concentrating flux.
  • the grooves extend horizontally and vertically and the four preferred directions of deflection correspond substantially to the directions of four standardized points of approval of the fog beam generated.
  • the light sources preferably consist of light-emitting diodes.
  • a signal light which comprises a plurality of low power light sources, in this case light emitting diodes (LED) 10 of the "Brewster" type, comprising a housing 11 , a substantially hemispherical window 12 for light output, and connection lugs 13 for example for the welding of the component 10 on a printed circuit (not shown).
  • LED light emitting diodes
  • the light also comprises a framework and flow recovery plate 20 comprising, in line with each source 10, a re-entrant cone 21 the bottom of which has a circular opening of diameter substantially equal to that from the window 12 for light output from said source, and opening by another circular opening of larger diameter.
  • the interior walls of the cone are metallized so as to recover the flux emitted in its direction by the LED.
  • the various cones 21 are connected together by flat zones 22 in this case perpendicular to the general direction of light emission, denoted xx.
  • the plate 20 makes it possible to obtain a signaling light in which the various sources, constituted by the LED 10, the cone 21 and the associated arrangements of the plate 30, are well individualized, in this case in the form of circles isolated from each other, in the illuminating surface of the lit fire.
  • the light also includes an optical plate 30 which comprises, at the opening of each cone 21, optical arrangements intended to concentrate and homogenize the light flux coming from the associated LED / cone assembly.
  • the flux concentration arrangements comprise in association with each cone 21 a converging lens with Fresnel rungs 32, concentric with the axis xx and focused in the vicinity of the window 11 of the associated source 10.
  • the arrangements spreading and homogenization include a series of concave tori 31, opposite the Fresnel steps.
  • the lens or light for closing the light is smooth on its two faces.
  • FIG. 2 illustrates an alternative embodiment of the optical plate 30, in which the arrangements 31 provided on the interior side of the plate 30 consist of convex balls, in particular spherical.
  • these arrangements 31 can be provided to ensure a different spreading of the light according to the horizontal (light distribution in azimuth) and according to the vertical (light distribution in elevation).
  • FIGS. 3 and 4 illustrate particular optical arrangements which, as will be seen below, can be provided either on the preferably internal face of an optical plate 30, or on the internal face of an external indicator 40 ( case illustrated in Figures 3 and 4).
  • the optical arrangements consist of prismatic grooves 41 which separate from one another zones 42 with parallel faces and therefore not deviating.
  • the profile of the indicator is the same horizontally and vertically, that is to say that horizontal and vertical grooves of the same profile separate areas with parallel faces 42 of square shape.
  • the grooves 41 are in this case made up of two faces each making an angle denoted A with respect to the normal to the plane of the sight glass (FIG. 3).
  • the width of the grooves is noted L, while the distance which separates them (side of the zones 42) is noted D.
  • Such optical arrangements are advantageously used in a rear fog light, whose photometric regulations impose minimum lighting to be observed along the optical axis xx, in two directions offset laterally on either side of the axis, and along two other directions shifted up and down on either side of the axis.
  • the prismatic elements constituted by the two faces of each vertical groove define two preferred lateral deflection directions, for an incident radiation close to normal to the light 40, and it is easy to calculate the angle A so that the angle of these deviations corresponds to that of the measurement points of a rear fog beam.
  • the orientation of the faces of the horizontal grooves is calculated so as to create two preferred deviation directions each corresponding to a measurement point vertically offset (above or below) relative to the x-x axis.
  • the ratio between the values of D and of L determines the proportion of the radiation subjected to deflection, and therefore makes it possible to favor the illumination at the measurement points offset at the expense of the measurement point along the x-x axis or vice versa.
  • FIG. 5 illustrates an embodiment of the invention, in which no cone plate 20 is provided, this in order to obtain, still with a series of LEDs 10, a continuous illuminating surface, that is to say say in which the various sources are not individualized.
  • the light of FIG. 5 is equipped with an indicator 40 as illustrated in FIGS. 3 and 4. Upstream of the indicator, there is provided, in addition to the LEDs 10, an optical plate 30 whose inner face is in the smooth species and the outer face of which comprises Fresnel steps 32, as in the case of FIG. 1.
  • the LEDs 10 and the associated lenses 32 make it possible to apply to the internal face of the sight glass 40 a radiation relatively concentrated on the axis x-x, and the arrangements 41, 42 of the sight glass fulfill the role described above.
  • FIG. 6 illustrates another embodiment in which groove arrangements separating zones with parallel faces are provided not on the face inside of the sight glass 40, which is here entirely smooth on its two faces, but on the inside face of the optical plate 30.
  • the grooves are indicated at 33 and delimit zones with parallel faces indicated at 34.
  • Figures 7 to 9 illustrate, by curves indicating the illumination obtained (in candela) as a function of the angular difference a (in degrees) laterally with respect to the optical axis xx, the horizontal light distribution obtained with a certain number signal lights designed according to the present invention.
  • FIG. 7 illustrates in solid lines (curve C1), for reference, the illumination obtained with a light-emitting diode 10 and an optical plate 30 whose inner face is smooth and whose outer face comprises Fresnel steps 32 .
  • the curve C2 shows the distribution obtained with, on the inside face of the plate 30, spherical balls with a pitch of 2.5 mm and a radius of 4.2 mm (i.e. to say ensuring a maximum deviation of approximately 17 °.
  • a good regularity of illumination is observed in a relatively wide range, extending beyond 10 ° on either side of the axis.
  • FIG. 8 illustrates the results obtained with a set of seventy diodes 10 all equipped with the same optical arrangements.
  • the curve C3 in solid lines shows the distribution obtained with a light produced according to FIG. 6, with grooves 30 calculated to generate a lateral deviation of ⁇ 10 ° and occupying 44% of the surface of the element 30.
  • Curve C4 (in dashed lines) illustrates the case where the optical plate 30 has on its outer face Fresnel steps and on its inner face spherical balls with a horizontal pitch of 4 mm, a vertical pitch of 2 , 4 mm and with a radius of 4 mm (embodiment of Figure 2).
  • curve C5 (in dashed lines) illustrates the case where the plate 30 is provided on its inner face with balls having the same pitch but a radius of 5 mm. The requirements for a rear fog lamp are again met.
  • FIG. 9 shows the curves obtained with two diodes equipped with optical arrangements according to FIG. 1 (toroids on the inner face of the optical plate 30).
  • Curve C6 (in solid lines) corresponds to tori with a horizontal pitch of 4 mm, a vertical pitch of 2.4 mm and a radius of 5 mm, while curve C7 (in dashed lines) corresponds to the case where the toroids have the same steps but a radius of 4 mm.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
EP94402291A 1993-10-13 1994-10-12 Signalleuchte für Kraftfahrzeuge mit einer Mehrzahl von Lichtquellen und mit einer optischer Zwischenscheibe Withdrawn EP0648968A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9312174A FR2711215B1 (fr) 1993-10-13 1993-10-13 Feu de signalisation à plusieurs sources et à plaque intermédiaire de traitement optique pour véhicule automobile.
FR9312174 1993-10-13

Publications (1)

Publication Number Publication Date
EP0648968A1 true EP0648968A1 (de) 1995-04-19

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP94402291A Withdrawn EP0648968A1 (de) 1993-10-13 1994-10-12 Signalleuchte für Kraftfahrzeuge mit einer Mehrzahl von Lichtquellen und mit einer optischer Zwischenscheibe

Country Status (2)

Country Link
EP (1) EP0648968A1 (de)
FR (1) FR2711215B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19826905A1 (de) * 1997-06-30 1999-01-07 Valeo Vision Signalleuchte mit Zwischenscheibe zur optischen Behandlung und mit Designfunktion
DE19831004A1 (de) * 1998-07-10 2000-02-03 Volkswagen Ag LED-Leuchte für ein Kraftfahrzeug

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2791121B1 (fr) 1999-03-19 2001-06-08 Valeo Vision Feu de signalisation multi-sources perfectionne pour vehicule automobile

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3916875A1 (de) * 1989-05-24 1990-12-06 Ullmann Ulo Werk Signalleuchte, insbesondere mehrkammersignalleuchte fuer kraftfahrzeuge
DE4128995A1 (de) * 1991-08-31 1993-03-04 Hella Kg Hueck & Co Signalleuchte fuer kraftfahrzeuge

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3916875A1 (de) * 1989-05-24 1990-12-06 Ullmann Ulo Werk Signalleuchte, insbesondere mehrkammersignalleuchte fuer kraftfahrzeuge
DE4128995A1 (de) * 1991-08-31 1993-03-04 Hella Kg Hueck & Co Signalleuchte fuer kraftfahrzeuge

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19826905A1 (de) * 1997-06-30 1999-01-07 Valeo Vision Signalleuchte mit Zwischenscheibe zur optischen Behandlung und mit Designfunktion
DE19831004A1 (de) * 1998-07-10 2000-02-03 Volkswagen Ag LED-Leuchte für ein Kraftfahrzeug

Also Published As

Publication number Publication date
FR2711215B1 (fr) 1996-01-05
FR2711215A1 (fr) 1995-04-21

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