EP3752765B1 - Phare de véhicule automobile a écran contre le rayonnement solaire entrant - Google Patents

Phare de véhicule automobile a écran contre le rayonnement solaire entrant Download PDF

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Publication number
EP3752765B1
EP3752765B1 EP19705093.3A EP19705093A EP3752765B1 EP 3752765 B1 EP3752765 B1 EP 3752765B1 EP 19705093 A EP19705093 A EP 19705093A EP 3752765 B1 EP3752765 B1 EP 3752765B1
Authority
EP
European Patent Office
Prior art keywords
light
motor vehicle
vehicle headlamp
shielding screen
shielding
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.)
Active
Application number
EP19705093.3A
Other languages
German (de)
English (en)
Other versions
EP3752765A1 (fr
Inventor
Lukas Taudt
Nina Brauner
Mathias SCHRAGL
Christoph Längauer
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.)
ZKW Group GmbH
Original Assignee
ZKW Group GmbH
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 ZKW Group GmbH filed Critical ZKW Group GmbH
Publication of EP3752765A1 publication Critical patent/EP3752765A1/fr
Application granted granted Critical
Publication of EP3752765B1 publication Critical patent/EP3752765B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F21S41/40—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by screens, non-reflecting members, light-shielding members or fixed shades
    • F21S41/43—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by screens, non-reflecting members, light-shielding members or fixed shades characterised by the shape thereof
    • 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
    • F21S41/141—Light emitting diodes [LED]
    • F21S41/143—Light emitting diodes [LED] the main emission direction of the LED being parallel to the optical axis of the illuminating device
    • 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
    • F21S41/141—Light emitting diodes [LED]
    • F21S41/151—Light emitting diodes [LED] arranged in one or more lines
    • F21S41/153—Light emitting diodes [LED] arranged in one or more lines arranged in a matrix
    • 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
    • F21S41/25—Projection lenses
    • F21S41/255—Lenses with a front view of circular or truncated circular outline
    • 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
    • F21S41/36—Combinations of two or more separate reflectors
    • F21S41/365—Combinations of two or more separate reflectors successively reflecting the light
    • 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
    • F21S41/60—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution
    • F21S41/65—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on light sources
    • F21S41/663—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on light sources by switching light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
    • F21S45/10—Protection of lighting devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

Definitions

  • the invention relates to a motor vehicle headlight with a substantially flat shielding screen for shielding incoming solar radiation, the shielding screen being arranged between a lighting unit with at least one light source and projection optics, and having a light exit opening for light emitted forwards by the lighting unit, the light emanating from the lighting unit is projected as a light image into the traffic area by means of the projection optics and the shielding screen is outside the focal plane of the projection optics.
  • the solar radiation in connection with optical elements of the headlight can heat up parts inside the headlight so much due to the so-called burning glass effect that irreversible damage occurs.
  • plastic parts can burn or melt, or electronic components can be destroyed. Therefore, various measures have been devised to counteract the harmful magnifying glass effect.
  • the document DE 10 2013 214 990 A1 shows a lens holder in the form of a conical tube, which is provided with a metal coating on the inside in order to prevent this lens holder from being damaged by solar radiation. In order to further reduce the heating of the lens holder, it can also have grooves in the area of the metal coating.
  • a screening screen of the present type is arranged in front of a lighting unit, e.g. which undesirably affects the light image projected onto the road.
  • shielding shade is used in this specification for a cover used to avoid the sun's magnifying glass effect, which cover does not necessarily have to be made of sheet metal. Rather, the cover can also consist of plastics and the shielding screen, whether it is made of metal or plastic, can have a radiation-absorbing coating, so that light or heat radiation is absorbed by the shielding screen.
  • deflection structures are formed at least in regions on the border of the light exit opening of the shielding screen, which lead to deflection of the scattered light emanating from the lighting unit and which is undesirable in the light image.
  • the border of the light exit opening of the shielding screen has a beveled edge as a deflection structure, at least in some areas, with the bevel running across the thickness of the shielding screen being inclined at a predetermined angle in the direction of the optical axis and the lighting unit.
  • Particularly inexpensive and easy to produce is an embodiment in which the border of the light exit opening of the shielding screen is angled at least in regions in the direction of the lighting unit and inclined towards the optical axis at a predetermined angle.
  • deflection structures are designed in the form of a large number of prongs for deflecting interfering marginal rays arriving from the lighting unit. It has proven to be expedient if 20 to 400, in particular 50 to 200, teeth are provided on one side of the border in the longitudinal extension of the light exit opening.
  • the invention is particularly useful in a headlight in which an optical attachment is arranged in the beam path between the light source and the shielding screen.
  • the shielding screen is arranged in front of the focal plane of the projection lens.
  • the invention also offers particular advantages when the light source comprises a number of LEDs arranged in a matrix.
  • the shielding screen is made of metal.
  • the shielding screen is made of plastic.
  • the shielding screen In both cases, it is often advisable for the shielding screen to have a radiation-absorbing coating in order to absorb and not reflect light or heat radiation.
  • a headlight 1 according to the invention can be seen in a schematic view with its components that are essential for explaining the invention, it being clear to the person skilled in the art that a headlight has a large number of other components not shown here, such as adjustment and adjustment devices, electrical supply means and much more. If the term "headlight” is used in connection with the invention, this term should also include individual projection modules, which can also be contained in a superordinate headlight in combination.
  • the headlight 1 has a lighting unit 2 in which a number of LEDs 5 are arranged in a matrix on a printed circuit board 4 as a light source 3 .
  • a lens attachment 6 is arranged in front of the LEDs 5 and is held here on the printed circuit board 4 by means of a holder 7 .
  • the LEDs 5 radiate their light into the light-guiding attachment lens 6, which emits a desired light pattern to the front. This light pattern is projected into the traffic space by means of projection optics 8, which in the present case is a one-piece lens.
  • projection optics 8 Between the projection optics 8 and the lighting unit 2 there is a screening screen 9 for screening incoming solar radiation, in which screen a light exit opening 10 is formed.
  • the individual parts are housed or held in a housing 11 , which is shown here only roughly schematically.
  • the headlight 1 shown corresponds to the prior art in terms of the design of its shielding screen 9 and the problem of the unwanted scattered light occurring here is explained below with reference to a basic beam path.
  • the optical path of the light emitted by the lighting unit 2 is in 2 denoted by Le .
  • This light or the beam path L e runs from the front of the attachment optics 6 through the light exit opening 10 of the shielding screen 9 and through the projection optics 8 into the traffic area in front of the motor vehicle.
  • Sunlight or sunbeams which fall at an angle of approx. 45° in this example, are in 2 marked with Ls.
  • the incident sunbeams are bundled by the projection optics 8 and, if there were no shielding screen 9, would be concentrated on a focal point or focal spot on the front of the attachment optics, where they could cause damage, namely by overheating of components, such as the holder 7, which often made of heat-sensitive plastic. Such overheating can not only lead to damage, such as warping of adjusted elements, but even to local fires up to and including vehicle fires. In this context one speaks of a burning glass effect of the headlight optics.
  • the sun's rays L S will strike the shielding screen, which can be designed to be heat-resistant as well as absorbing and/or reflecting according to its purpose.
  • the shielding screen In 2 the light rays that would reach the light unit 2 without the shielding screen 9 are denoted by L S '.
  • the shielding screen 9 does not influence those rays L e which are intended to generate the light image on the road, in practice the never-perfect attachment optics 6 also emit undesired marginal rays L R which are emitted on the essentially horizontally running inner boundary surface 12 the border 13 of the light exit opening 10 are deflected in the direction of the projection optics 8 as scattered light L RS and reach areas of the light image where they cause undesired artefacts.
  • the invention now provides for deflection structures to be formed at least in regions on the border of the light exit opening of the shielding screen, which lead to a reduction in the scattered light occurring at the border.
  • FIGS. 3 and 4 show a first inventive design of the deflection structures.
  • the light exit opening 10 or its border 13 is formed in the shielding screen 9 in such a way that the beam path generating the desired light image is not cut.
  • the border 13 is angled at a predetermined angle relative to the optical axis a , so that an angled edge region 14 is formed.
  • This angling of the border 13 does not necessarily have to be carried out over the entire border; it is usually sufficient to bend in some areas, preferably in the lower part of the border. Whether the angling runs in the direction of the lighting unit 2 or in the direction of the projection optics 8 is essentially irrelevant, which will be explained in more detail below.
  • the angle must be large enough so that incident marginal rays L R are not directed forwards to the projection optics 8 .
  • the minimum required angle depends on the respective geometry of the arrangement, in particular on the size of the light exit opening of the shielding screen, its thickness and the position of the shielding screen 9 in relation to the exit surface of the front optics.
  • the shielding screen 9 in contrast to screens which define the edges of the light image and should therefore be imaged sharply, is not in the focal plane of the projection optics 8, but outside it, sensibly in front of it. Limitations of the luminous image are determined by the luminous unit 2 or the front optics 6 and not by the light exit opening 10 of the shielding screen 9.
  • An example of a screen in the focal plane of the projection optics can be found in FIG EP 2 742 282 B1 the applicant.
  • a light exit opening 10 with a border 13 is formed in the shielding screen 9, this border having a plurality of prongs 15 in its upper and lower region for deflecting disruptive marginal rays L R arriving from the lighting unit 2.
  • two undesired marginal rays L R arriving from the lighting unit 2 are shown, as well as two light rays L A deflected or scattered at the points 15 .
  • spikes should not necessarily include “pointed” elevations, but very generally elevations, with typically 20 to 400, mostly 50 to 200 such elevations being provided on one longitudinal side of the light exit opening.
  • the approximately rectangular light exit opening 10 of the shielding screen 9 was 80 mm wide and 18 mm high and the prongs 15 had a height and width between 0.5 up to 2 mm.
  • Figures 8 and 9 which show a light distribution measured for a headlight with the exemplary embodiment according to the invention - 8 - or for the same headlight without spikes 15 on the border of the light exit opening 10 - 9 you can see scattered light areas above and below the desired light pattern, of which the upper area is particularly pronounced.
  • the undesired scattered light achieves a maximum light intensity of 162 cd, but 323 cd in a design without spikes.
  • Fig. 10a shows again in a detail 2 the undesired reflection of marginal rays LR as deflected light rays L A forward in the direction of the projection optics.
  • Fig. 10b shows an embodiment in which the border of the shielding screen 9 has a beveled edge 17 at least in regions as a deflection structure, the bevel running across the thickness of the shielding screen 9 being inclined at a predetermined angle in the direction of the optical axis a and the lighting unit.
  • the inclination of this angle is opposite to that according to FIG. 10b, but in both cases the incident marginal rays L R are kept away from the projection optics as deflected light rays L A .
  • Fig. 10d and Fig. 10e show analogous to 4 angled edge areas, the bend 18 in FIG. 10d running backwards in the direction of the lighting unit, but in FIG. 10e forwards to the projection optics.
  • the effect is as can be seen from the course of the rays of the incoming marginal rays L R and the deflected light rays L A however, the deflection structure is comparable in both cases and similar to the bevels of Figures 10b and 10c.
  • Fig. 10f shows an embodiment in which the border is tapered at least in regions in the manner of a cutting edge 19 , the effect of reducing the scattered light being evident here too, since there is no flat area which has marginal rays L R as deflected light rays L A could lead in the direction of the projection optics, rather a beveled edge 17 is effective as in the embodiment according to FIG. 10c.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (AREA)
  • Mathematical Physics (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Claims (11)

  1. Projecteur de véhicule automobile avec un écran (9) essentiellement plat pour protéger du rayonnement solaire entrant, l'écran étant disposé entre une unité d'éclairage (2) avec au moins une source lumineuse (3) et une optique de projection (8), et il présente une ouverture de sortie de lumière (10) pour la lumière émise vers l'avant par l'unité d'éclairage, la lumière émise par l'unité d'éclairage étant projetée dans l'espace de circulation sous la forme d'une image lumineuse au moyen de l'optique de projection et l'écran de protection étant situé à l'extérieur du plan focal de l'optique de projection,
    caractérisé en ce que
    des structures de déviation (14, 15, 16, 17, 18, 19) sont formées au moins par endroits sur le pourtour (13) de l'ouverture de sortie de lumière (10) de l'écran de protection (9), lesquelles conduisent à une déviation de la lumière parasite émanant de l'unité d'éclairage et non souhaitée dans l'image lumineuse.
  2. Projecteur de véhicule automobile selon la revendication 1, caractérisé en ce que le bord (13) de l'ouverture de sortie de lumière (10) du cache (9) présente, au moins par endroits, un bord biseauté (17) en tant que structure de déviation, le biseau s'étendant sur l'épaisseur du cache étant incliné d'un angle prédéterminé en direction de l'axe optique et de l'unité d'éclairage.
  3. Projecteur de véhicule automobile selon la revendication 1, caractérisé en ce que le bord (13) de l'ouverture de sortie de lumière (10) du cache de protection (9) est incliné au moins par zones par rapport à l'axe optique (a) selon un angle prédéterminé dans un coude (18).
  4. Projecteur de véhicule automobile selon la revendication 1, caractérisé en ce que les structures de déviation se présentent sous la forme d'une pluralité de dents (15) destinées à dévier les rayons périphériques (LR) gênants arrivant de l'unité d'éclairage (2).
  5. Projecteur de véhicule automobile selon la revendication 4, caractérisé en ce que, dans l'extension longitudinale de l'ouverture de sortie de lumière (10), 20 à 400, en particulier 50 à 200 dents (15) sont prévues sur un côté de la bordure (13).
  6. Projecteur de véhicule automobile selon l'une des revendications 1 à 5, caractérisé en ce qu'une optique additionnelle (7) est disposée sur le trajet du faisceau entre la source lumineuse (3) et le cache (9).
  7. Projecteur de véhicule automobile selon l'une des revendications 1 à 6, caractérisé en ce que l'écran (9) est disposé en avant du plan focal de la lentille de projection.
  8. Projecteur de véhicule automobile selon l'une des revendications 1 à 7, caractérisé en ce que la source lumineuse (3) comprend un certain nombre de LED (5) disposées en matrice.
  9. Projecteur de véhicule automobile selon l'une des revendications 1 à 8, caractérisé en ce que l'écran (9) est métallique.
  10. Projecteur de véhicule automobile selon l'une des revendications 1 à 8, caractérisé en ce que l'écran (9) est en matière plastique.
  11. Projecteur de véhicule automobile selon la revendication 9 ou 10, caractérisé en ce que le cache de protection (9) présente un revêtement absorbant le rayonnement.
EP19705093.3A 2018-02-15 2019-01-22 Phare de véhicule automobile a écran contre le rayonnement solaire entrant Active EP3752765B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP18156939.3A EP3527875A1 (fr) 2018-02-15 2018-02-15 Phare de véhicule automobile pourvu d'un condensateur plan
PCT/EP2019/051435 WO2019158319A1 (fr) 2018-02-15 2019-01-22 Projecteur de véhicule automobile comprenant un écran de protection pour la protection contre le rayonnement solaire incident

Publications (2)

Publication Number Publication Date
EP3752765A1 EP3752765A1 (fr) 2020-12-23
EP3752765B1 true EP3752765B1 (fr) 2022-10-26

Family

ID=61226477

Family Applications (2)

Application Number Title Priority Date Filing Date
EP18156939.3A Withdrawn EP3527875A1 (fr) 2018-02-15 2018-02-15 Phare de véhicule automobile pourvu d'un condensateur plan
EP19705093.3A Active EP3752765B1 (fr) 2018-02-15 2019-01-22 Phare de véhicule automobile a écran contre le rayonnement solaire entrant

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP18156939.3A Withdrawn EP3527875A1 (fr) 2018-02-15 2018-02-15 Phare de véhicule automobile pourvu d'un condensateur plan

Country Status (6)

Country Link
US (1) US11371671B2 (fr)
EP (2) EP3527875A1 (fr)
JP (1) JP7019824B2 (fr)
KR (1) KR102429313B1 (fr)
CN (1) CN111699344B (fr)
WO (1) WO2019158319A1 (fr)

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JP6709654B2 (ja) * 2016-03-25 2020-06-17 株式会社小糸製作所 車両用灯具、および当該車両用灯具を備えた車両
JP6866795B2 (ja) * 2017-07-26 2021-04-28 市光工業株式会社 車両用灯具
JP6571734B2 (ja) * 2017-09-04 2019-09-04 トヨタ自動車株式会社 車両用照明装置

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EP3752765A1 (fr) 2020-12-23
US20210003263A1 (en) 2021-01-07
CN111699344A (zh) 2020-09-22
KR102429313B1 (ko) 2022-08-04
US11371671B2 (en) 2022-06-28
EP3527875A1 (fr) 2019-08-21
KR20200110680A (ko) 2020-09-24
WO2019158319A1 (fr) 2019-08-22
JP7019824B2 (ja) 2022-02-15
JP2021512466A (ja) 2021-05-13
CN111699344B (zh) 2022-09-30

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