EP2995855B1 - Beleuchtungsvorrichtung und zugehöriges verfahren - Google Patents

Beleuchtungsvorrichtung und zugehöriges verfahren Download PDF

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Publication number
EP2995855B1
EP2995855B1 EP15183833.1A EP15183833A EP2995855B1 EP 2995855 B1 EP2995855 B1 EP 2995855B1 EP 15183833 A EP15183833 A EP 15183833A EP 2995855 B1 EP2995855 B1 EP 2995855B1
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EP
European Patent Office
Prior art keywords
light radiation
reflectors
reflector
reflective surfaces
lighting device
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EP15183833.1A
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English (en)
French (fr)
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EP2995855A1 (de
Inventor
Alberto Alfier
Dina Pasqualini
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Siteco GmbH
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Osram GmbH
Osram SpA
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/0025—Combination of two or more reflectors for a single light source
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2131/00—Use or application of lighting devices or systems not provided for in codes F21W2102/00-F21W2121/00
    • F21W2131/10—Outdoor lighting
    • F21W2131/103—Outdoor lighting of streets or roads
    • 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 present description relates to lighting devices.
  • One or more embodiments may refer to lighting devices employing solid state light radiation sources such as, for example, LED sources.
  • One or more embodiments may refer to lighting devices adapted to be used, e.g., for streetlighting applications.
  • Such lighting arrangements are the object e.g. of norm EN13201.
  • the classes known as S and CE are examples of possible classifications of such lighting devices.
  • the lighting uniformity may be expressed as minimum illuminance or as minimum ratio between minimum illuminance and average illuminance.
  • Illuminance is the total light flux impinging on a plane per surface unit, and provides a measure of the surface lighting by the impinging light.
  • the previously mentioned classes S and CE are mainly intended for pedestrians and pedal cyclists on footways, cycleways, emergency lanes and other road areas lying separately from or along the carriageway of a traffic route, and/or for residential roads, pedestrian streets, parking places, schoolyards etc.
  • the lenses are adapted to exert an effective control action on the light radiation, because the light radiation coming from the source touches the lens profile and can therefore be properly directed.
  • lenses exhibit limits as regards tailoring the light distribution at high angles, where Fresnel reflections play a relevant role.
  • Lenses may have other limits when they are used with solid state lighting devices, such as LED sources, for example in a streetlighting scenario.
  • lenses are usually designed considering the near field radiation of a specific light radiation source. If the light radiation source changes, there may occur a change in the near field distribution, so that the performance of the lens may be altered, too.
  • lenses are normally small in comparison to the light radiation source (e.g. a LED sources), even small (as small as 0,1 mm) tolerances on the positioning of the light radiation source may generate considerable deviations in the expected radiation distribution.
  • Le lenses which are designed to work e.g. with a cluster of LEDs may moreover show a certain degree of instability in case of possible modifications of the LED number and arrangement within the cluster.
  • a solution envisages additional reflector components mounted on the light radiation source, so that straight rays may be reflected at high angles.
  • this solution has the drawback that the additional components require additional assembling steps and tolerances, and moreover exhibits functional limits due to the high number of reflections, which may lead to a decreased efficiency.
  • Documents exemplary of the prior art include, e.g.:
  • One or more embodiments aim at overcoming the previously outlined drawbacks.
  • said object is achieved thanks to a lighting device having the features specifically set forth in the claims that follow.
  • One or more embodiments concerns a corresponding method.
  • One or more embodiments enable to achieve a wide, e.g. batwing-like light distribution (as used for applications such as streetlighting) by optionally resorting to a modular approach.
  • one or more embodiments may solve one or several of the following problems:
  • One or more embodiments may find application in a streetlighting environment, as exemplified e.g. in Figure 1 .
  • reference S denotes a road scenario which is lit by lighting device 10, mounted on poles or other support / suspension means with respect to road plane S.
  • the support may consist of poles P arranged at a distance d, adapted to be much longer (e.g. up to 7 - 9 times) than the height h at which lighting devices 10 are arranged.
  • lighting devices 10 may be arranged either along a side of road S (see Figure 11 ) or centrally with respect to the road (see Figure 12 ).
  • the lighting devices 10 may be desired to produce a wide light distribution, which may be for example batwing-like.
  • the light distribution is defined according to planes, i.e. denoted as C0-C180, longitudinal to the road plane, and according to planes C90-C270 transversal to the road plane, with plane C90 facing the street.
  • Planes C0-C180 and the immediately surrounding planes have High Candela (CD) Peaks at high angles (>60°).
  • CD High Candela
  • such illuminance distribution may be made independent from the type and the distribution of the light radiation sources mounted on devices 10, e.g. when such light radiation sources - as it is envisaged in one or more embodiments - comprise solid state light radiation sources, such as LED sources, for instance conventional LED sources, of a Lambertian type.
  • solid state light radiation sources such as LED sources, for instance conventional LED sources, of a Lambertian type.
  • Such a reflector may be subject to mechanical constraints, due to the housing wherein it is mounted.
  • the length of reflector along axis x (the x direction being parallel to the lengthwise direction of road S) may be constrained to be ⁇ 8a
  • the width of the reflector along the y direction (transverse to road S) may be constrained to be ⁇ 3a
  • the height of the reflector along the z direction (perpendicular to x and y) may be constrained to be ⁇ 2a.
  • the lateral walls whereof collect the light flux of the light radiation source and project it towards the lit plane, determining the shape (e.g. a batwing-like shape) and the position of the candela peaks.
  • a modular structure of device 10 including a support element which defines a support structure 12, e.g. a plane structure, whereon there are arranged a plurality of light radiation sources 14 associated to a respective reflector 16, so that each light radiation source 14, with a respective reflector 16 coupled thereto, supplies a respective portion of light distribution L.
  • the latter may be, as exemplified in Figure 2 , a batwing-like distribution L, including two wings respectively denoted as L1 and L2.
  • one of the light radiation sources 14, with the respective reflector 16 associated thereto may be arranged to cover planes C270-C90, passing through plane C0, while the other light radiation source 14, with the respective reflector associated thereto, covers planes C90-C270 passing through plane C180.
  • the modular elements of lighting device 10 may be all identical.
  • such modular elements of lighting device 10 may be different from each other.
  • the distribution portions of the light radiation generated by each module comprising source 14 and reflector 16 may be identical or different from each other.
  • each module comprising source 14 and reflector 16 being adapted to provide a half of the light radiation distribution may be extended to a higher number of modules (three or more) comprising light radiation source 14 and reflector 16, which may be identical to or different from each other.
  • the generation of the full light distribution of device 10 through the contribution of a plurality of modules, each comprising source 14 and reflector 16, may involve a different orientation of such modules.
  • two modules comprising source 14 and reflector 16 are so to speak arranged back-to-back, the main axes X16 of reflectors 16 being parallel to each other.
  • FIG. 2 The schematic view of Figure 2 exemplifies moreover a possible orientation of both modules, and specifically of reflectors 16, with respect to axis x, which is parallel to the longitudinal direction of road plane S and to axis y, extending in a transversal direction with respect to road plane S.
  • support element 12 may consist of a Printed Circuit Board (PCB).
  • PCB Printed Circuit Board
  • Figures 3 and 4 exemplify the fact that, in one or more embodiments, light radiation sources 14 may have different shapes, e.g. rectangular, square, circular. Of course, these are only some possible shapes and some possible mounting positions of light radiation sources.
  • Figures 3 and 4 envisage the presence of two light radiation sources 14, in one or more embodiments it is possible to envisage a higher number of light radiation sources.
  • the two parts of Figure 4 exemplify the fact that light radiation sources 14 may have the same size and may be arranged in different mounting positions / locations, according to the application needs; for example, in order to achieve a cost reduction, the same value of coordinate x may be used for the mounting location or position of light radiation sources 14.
  • the portions of light radiation source distribution generated by each module, comprising source 14 and reflector 16, may be identical to each other.
  • the portions of light radiation source distribution generated by each module, comprising source 14 and reflector 16, may be different from each other.
  • the light radiation sources may consist of solid state light radiation sources, e.g. LED sources.
  • the light radiation sources may be composite and may comprise e.g. a plurality of LEDs, with the possibility to use arrays of e.g. 4, 6 or 8 single light radiation sources.
  • FIGS 5 to 8 exemplify possible embodiments of reflectors 16 (in the following it will be assumed for simplicity that such reflectors are identical to each other).
  • Such reflectors may be implemented for example as moulded elements (such as moulded plastic material) having a general ribbon-like shape and a general loop-shaped structure (closed loop, in the examples shown in the figures).
  • reflector 16 may have two reflective lateral inner surfaces 16a, 16b, adapted to receive the radiation coming from the mounting position of light radiation source 14 on surface 12, and to reflect the light radiation source away from surface 12, towards the lit plane (for example towards road surface S).
  • the reflectivity features of surfaces 16a, 16b may be achieved according to any proper means, e.g. by making or treating such surfaces with a material which reflects light radiation, such as for example an aluminization layer.
  • the first reflective surface 16a may be closer to the mounting position of light radiation source 14 than the second reflective surface 16b.
  • the first reflective surface 16a which is closer to the mounting position of light radiation source 14, may intercept a portion of the light radiation flux allowing to form a respective portion (e.g. portion L1 or portion L2, referring to the case exemplified in Figure 2 ) of the resulting light distribution, e.g. batwing-shaped.
  • This result (which may be extended, as previously stated, to a higher number of sources 14 / reflectors 16) may be used to implement reflectors 16 as distinct moulded parts, which are assembled separately on support 12, or as moulded parts of a piece, so as to form a single component.
  • reflector 16 may be a sort of "winding" reflector, the reflective surfaces 16a and 16b being arranged facing each other along a main axis X16 of reflector 16.
  • reflectors 16 may be arranged with their reflective surfaces 16a adjacent each other, with their main axes X16 parallel to each other.
  • At least one of the reflective surfaces may be seen as including several stripes 160, extending along a perpendicular direction to support structure 12.
  • stripes 160 may in turn be seen as comprising portions in sequence along the longitudinal extension of the stripe.
  • Such a surface structure of surfaces 16a, 16b may be seen, in a complementary way, as comprising stripes extending along a direction parallel to support structure 12, these stripes comprising in turn portions arranged in a string along the lengthwise extension of the stripe.
  • the final result is a surface which may be defined a matrix surface structure.
  • the surface profile of stripes 160 may be described with a parametric equation, e.g. in the form of a parabola having the focus adapted to correspond to the mounting position of light radiation source 14, so as to direct the light rays towards the lit plane (e.g. the road surface).
  • a parametric equation e.g. in the form of a parabola having the focus adapted to correspond to the mounting position of light radiation source 14, so as to direct the light rays towards the lit plane (e.g. the road surface).
  • Figure 8 exemplifies the possibility, in one or more embodiments, to apply onto reflective surfaces 16a and/or 16b, e.g. on at least a part of stripes 160, pillow lenses 162, by acting upon the illumination uniformity with a possible peak alternation, e.g. when discrete light radiation sources (e.g. LED sources) are used.
  • discrete light radiation sources e.g. LED sources
  • Figures 9 to 12 exemplify the possibility to "play” on the position and/or the orientation of reflective surfaces 16a, 16b in order to achieve a particular light distribution.
  • Figure 9 shows the possibility to vary the extension of reflective surfaces 16a, 16b, so as to achieve a desired shaping action of the lighting beam.
  • Figure 10 exemplifies the possibility to modify the distance separating the reflective surfaces (e.g. surface 16a) from the mounting position of light radiation source 14.
  • Figures 11 and 12 exemplify the possibility to modify the orientation ( Figure 11 ) or the position ( Figure 12 ) of said reflective surfaces (once again we refer to the example of surface 16a), for example in conditions wherein lighting device 10 is placed on a side of the road surface ( Figure 11 ) or at the centre of the road surface ( Figure 12 ).
  • the reflective surface may be "twisted" towards the road surface.
  • stripes 160 are present, having e.g. a parabola surface profile, the parabola axes are made to lie in or around plane C0-C180, optionally with an orientation towards the peak position of the batwing profile.
  • the parabolas describing the profile of stripes 160 may be oriented so that their axes lie in these planes, the parabolas being optionally oriented towards angular position G of the Candela Peak (CD) beyond 60°.

Claims (6)

  1. Beleuchtungsvorrichtung, beinhaltend:
    - ein Stützelement mit einer Stützoberfläche (12) mit einer Vielzahl von Befestigungsstellen für Lichtabstrahlungsquellen (14),
    - eine Vielzahl von Reflektoren (16) die die Befestigungsstellen der Vielzahl von Befestigungsstellen auf der Stützoberfläche (12) umgeben, wobei die Reflektoren (16) beinhalten erste (16a) und zweite (16b) laterale reflektierende Oberflächen zum von der Stützoberfläche (12) weg reflektieren von Lichtabstrahlung von einer Befestigungsstelle der Vielzahl von Befestigungsstellen (14), wobei:
    - die erste reflektierende Oberfläche (16a) und die zweite reflektierende Oberfläche (16b) entlang einer Achse (X16) des Reflektors (16) einander zugewandt angeordnet sind.
    - die erste reflektierende Oberfläche (16a) näher an der ersten Befestigungsstelle ist als die zweite reflektierende Oberfläche (16b), charakterisiert dadurch, dass
    - die Vorrichtung mindestens ein Paar von Reflektoren (16) beinhaltet, die mit ihren ersten Oberflächen (16a) angrenzend, Rücken and Rücken zueinander angeordnet sind,
    - das mindestens eine Paar von Reflektoren (16) mit ihren Achsen (X16) parallel zueinander angeordnet ist, und
    - die Reflektoren (16) eine bänderartige geschlossene Schlaufenstruktur mit der ersten reflektierenden Oberfläche (16a) und der zweiten reflektierenden Oberfläche (16b) beinhaltend erste und zweite Seiten der bänderartigen Struktur.
  2. Beleuchtungsvorrichtung gemäß Anspruch 1, wobei mindestens eine der ersten (16a) und der zweiten (16b) reflektierenden Oberflächen eine Vielzahl von Streifen (160) beinhaltet.
  3. Beleuchtungsvorrichtung gemäß Anspruch 2, wobei die Streifen (160):
    sich in einer Richtung senkrecht zu der Stützoberfläche (12) erstrecken, und/oder
    ein parabolisches Profil mit einer Fokussierung auf die eine Befestigungsstelle haben.
  4. Beleuchtungsvorrichtung gemäß Anspruch 2 oder 3, beinhaltend Kissenlinsen (162), die gekoppelt sind an mindestens manche der Streifen (160).
  5. Beleuchtungsvorrichtung gemäß einem der vorhergehenden Ansprüche, beinhaltend Festkörper Lichtabstrahlungsquellen (14), bevorzugt LEDs, an den Befestigungsstellen.
  6. Verfahren zum Bereitstellen einer Beleuchtungsvorrichtung, beinhaltend:
    - Bereitstellen eines Stützelements mit einer Stützoberfläche (12) mit einer Vielzahl von Befestigungsstellen für Lichtabstrahlungsquellen (14),
    - Anordnen einer Vielzahl von Reflektoren (16), die die Befestigungsstellen der Vielzahl von Befestigungsstellen auf der Stützoberfläche (12) umgeben, wobei die Reflektoren (16) erste (16a) und zweite (16b) laterale reflektierende Oberflächen zum von der Stützoberfläche (12) weg reflektieren von Lichtabstrahlung von einer Befestigungsstelle der Vielzahl von Befestigungsstellen (14) beinhalten, wobei das Verfahren Anordnen der Reflektoren (16) beinhaltet,, mit der ersten reflektierende Oberfläche (16a) näher an der einen Befestigungsstelle als die zweite reflektierende Oberfläche (16b),
    - einander zugewandt Anordnen der ersten (16a) und zweiten (16b) reflektierenden Oberflächen entlang einer Achse (X16),
    - Bereitstellen mindestens eines Paares von Reflektoren (16), die mit ihren ersten Oberflächen (16a) angrenzend, Rücken and Rücken zueinander angeordnet sind,
    - wobei das mindestens eine Paar von Reflektoren (16) mit ihren Achsen (X16) parallel zueinander angeordnet ist und eine bänderartige geschlossene Schlaufenstruktur hat, mit der ersten (16a) und der zweiten (16b) reflektierenden Oberfläche beinhaltend erste und zweite Seiten der bänderartigen Struktur.
EP15183833.1A 2014-09-10 2015-09-04 Beleuchtungsvorrichtung und zugehöriges verfahren Active EP2995855B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITTO20140705 2014-09-10

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EP2995855B1 true EP2995855B1 (de) 2019-06-26

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Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK2019250T3 (da) 2007-07-26 2012-03-12 Innolumis Public Lighting B V Gadebelysningsindretning
US7828456B2 (en) 2007-10-17 2010-11-09 Lsi Industries, Inc. Roadway luminaire and methods of use
US8485684B2 (en) 2011-05-13 2013-07-16 GE Lighting Solutions, LLC LED roadway luminaire

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
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