EP2947384A1 - A reflector for lighting devices, corresponding lighting device and method - Google Patents
A reflector for lighting devices, corresponding lighting device and method Download PDFInfo
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- EP2947384A1 EP2947384A1 EP15168705.0A EP15168705A EP2947384A1 EP 2947384 A1 EP2947384 A1 EP 2947384A1 EP 15168705 A EP15168705 A EP 15168705A EP 2947384 A1 EP2947384 A1 EP 2947384A1
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- Prior art keywords
- reflector
- light radiation
- reflective
- sides
- ribbon
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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
- F21V7/04—Optical design
- F21V7/048—Optical design with facets structure
-
- 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
- F21V7/04—Optical design
- F21V7/06—Optical design with parabolic curvature
-
- 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
- F21V7/04—Optical design
- F21V7/09—Optical design with a combination of different curvatures
-
- 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
Definitions
- the present description relates to reflectors for lighting devices.
- One or more embodiments may be employed, for example, in streetlighting applications.
- the target values of these parameters may vary according to the different road classifications (ME1, ME2, S1, CE0, %) and according to various factors (pole interspacing, pole height, etc.) which may impact on performance levels.
- Various implementations may involve the use of light radiation sources, e.g. solid-state LED radiation sources, combined with lenses.
- Each lens is adapted to provide a certain radiation pattern, with the possibility to fulfil road requirements in terms of light distribution on the road surface: by increasing the number of sources and lenses it is possible to increase the lighting flux up to the level required by the standards.
- Some implementations envisage a combination of different types of lenses (e.g. with different lighting patterns) and the assembly ("convolution") of the various radiation patterns originates the required final radiation pattern.
- the first important factor is the distance of the lens from the light radiation source: factors such as the temperature of the lens and/or the blue light density, for example from a LED, may degrade the performance of the polymer which forms a polymeric lens.
- glass lenses may solve some of these drawbacks, but it may involve disadvantages as regards design and cost constraints.
- a given lens may be optimized only for a specific source of light radiation, e.g. only for one specific LED.
- some lighting sources may be visible from all directions and cause discomfort to observers, with a possible undesired light spillage at high angles.
- reflectors may be freeform reflectors for clustered solutions, or small freeform/conic shaped reflectors which are coupled to each light radiation source in distributed solutions.
- a drawback of these solutions regards optical efficiency, which may be reduced by multiple reflections and by the limited reflectivity of the reflector (usually about 85%).
- One or more embodiments aim at overcoming the previously outlined drawbacks.
- said object is achieved thanks to a reflector having the features specifically set forth in the claims that follow.
- One or more embodiments may also refer to a corresponding lighting device as well as a corresponding method.
- Figure 1 shows a possible application context of one or more embodiments, specifically in the field of technical street lighting.
- Figure 1 shows a part of a road S, of indefinite length, having a width w and being lit by luminaires 10 mounted e.g. on poles P.
- luminaires 10 may be separated by distance i, may be placed at a height h and may be mounted on poles P having the base at a certain distance from the edge of the road.
- luminaires 10 may comprise (e.g. mounted in a respective housing, not visible in the Figures) a reflector body 12, e.g. of a molded material, such as a lightweight metal material or plastic.
- Reflector 12 is designed to be coupled to a light radiation source L adapted to comprise for example an electrically powered light radiation source.
- the source may be a solid-state source, such as for example ad LED source mounted on a PCB (Printed Circuit Board, not visible in the drawings).
- PCB printed Circuit Board
- light radiation source L (whatever it may be) may be designed to be placed in a given position, marked by point F.
- source L will hereinafter be identified with point F, therefore assuming for simplicity the presence of a point-shaped light radiation source.
- reflector 12 may have the function of reflecting the light emitted from light radiation source L, arranged in position F, towards an illumination space adapted to be identified, for instance, with road surface S.
- reflector 12 may have an internal reflective surface having a substantially ribbon-like shape, possibly of a constant or substantially constant height.
- Said reflective surface may therefore be seen as ideally enclosed between two end planes.
- light radiation source L may be placed at one of such end planes, i.e. it may lie in one of such planes or in the vicinity thereof.
- the light radiation emitted from source L may propagate towards said reflective surface, in order to be reflected thereby (according to ways described in the following), so as to be projected out of luminaire 10 towards the illumination space, i.e. the space that must be lit (for example road surface S of Figure 1 ).
- reflector 12 may have itself a generally ribbon-like shape. Said ribbon-like reflective surface may then be simply comprised of the inner surface of reflector body 12, shaped and/or treated (e.g. with an aluminising treatment) so as to have (high) reflectivity.
- said reflective surface may be a multi-faceted surface, comprising several reflective sides or facets.
- said multi-faceted reflective surface may comprise:
- each of the front 120, back 122 and end 124 sides is shaped and/or oriented so as to reflect the radiation coming from radiation source L, while directing it in a different direction of the illumination space.
- said multi-faceted reflective surface comprising sides or facets 120, 122 and 124 may be an annular surface, e.g. with the shape of a closed loop.
- all said multi-faceted surface may be reflective. In one or more embodiments, said multi-faceted surface may comprise separating portions between reflective portions.
- the front 120 and back 122 sides, on one hand, and the end sides 124, on the other hand may constitute respectively the major and the minor sides of a multi-faceted reflective surface the plan view whereof is an approximately rectangular broken curve, the light radiation source L (point F) being arranged approximately in the middle (see for example the plan view of Figure 2 ), i.e. in a central symmetry plane of the reflective surface.
- the multi-faceted reflective surface comprising facets or sides 120, 122 and 124 has on the contrary a substantially asymmetrical plan view.
- each of the sides 120, 122, 124 constitutes a portion of the (internal) reflective surface of reflector 12, being able to reflect the light radiation of source L towards the illumination space in an independent way, i.e. via a single reflection: for example, a ray emitted by radiation source L meets the reflective surface only once.
- the front side 120, the back side 122 and each of the end sides 124 of the reflective surface is so to say “dedicated” to sending the light radiation reflected thereby towards a direction of the illumination space which corresponds to a respective area of road surface S.
- one or more embodiments as exemplified herein may be used in a context as the one explained with reference to Figure 1 , wherein the height h of poles P approximately corresponds to the width w of road S, and the distance i separating poles P (i.e. luminaires 10) is approximately 3-4 times the height h.
- a reflecting mechanism may be implemented whereby at least some of the light beams reflected by the various facets or sides 120, 122 and 124 may cross each other on the propagation path in the illumination space.
- illumination beams L3 reflected by sides 124 and directed towards the end regions S3 may cross while exiting luminaire 10, so that (referring by way of example only to the arrangement of Figure 9 ):
- illumination beams L1 and 12 reflected by front side 120 and back side 122 may cross while exiting luminaire 10, too, so that, always referring by way of example only to the relative arrangement shown in Figures 10 and 11 :
- Figures 6 to 8 exemplify various criteria which may be used, in one or more embodiments, to implement sides 120, 122 and 124 of the multi-faceted reflective surface of reflector 12 according to parametric curves (ellipsoids, parabolas, spheres).
- the reflective surfaces which correspond to the end sides 124 may be implemented so as to have a parabolic surface (a paraboloid), the focus of the parabola being disposed at point F where light radiation source L is arranged, and the axis of the parabola/paraboloid which describes the profile of said parabolic surface being oriented so as to direct the reflected radiation for example towards the areas S3 of the road surface which are farthest away from the mounting position of luminaire 10.
- a parabolic surface a paraboloid
- one or more parabolic profiles may be used, according to the space which must be lit, with the possibility of aiming each parabolic profile towards a different target area.
- the Figures exemplify moreover, with reference to the front side 120 and the back side 122, the possibility to give the sides of the reflective surface a further multi-faceted shape, wherein one or more sides 120, 122 and 124 of the multi-faceted reflective surface comprise in turn several portions or parts.
- front side 120 may have a general gull-wing shape, with two symmetrical portions (referring to an ideal plane passing through point F) each of which comprises:
- proximal and distal refer to the relative arrangement with respect to source L.
- At least one of the sides may be implemented as a Fresnel reflector, i.e. with a reflective surface divided into various facets F1, F2, F3, ... each of which may be named a "Fresnel facet”.
- various facets F1, F2, F3, ... may be oriented vertically with respect to the lying plane of source L.
- the profile of the facets of the Fresnel reflector may be described by a parametric curve.
- each Fresnel facet may be described by a parabolic equation, wherein the focus of the parabola may be arranged at point F, where the light radiation source L lies, and the axis of the parabola/paraboloid describing the profile of the facet surface may be oriented so as to direct the reflected radiation towards a respective portion SF1, SF2, SF3 (see Figure 5 above) of road surface S, i.e. in a respective direction of the illumination space.
- Figure 8 exemplifies how such a parametric criterion may be applied to different sides, so that for example the radiation reflected by one of the end sides 124 and the radiation reflected by the distal portion 120c of front side 120 are directed towards respective portions S3 and S31 of road surface S, therefore, once again, in respective directions of the illumination space.
- one or more sides of the reflective surface may optionally be filled with so-called “pillows” in order to broaden and smooth the light distribution.
- the reflector body 12 may be formed by two parts 12a, 12b, which may be adapted for example to be coupled on a plane which is parallel to the lying plane of a PCB on which the light radiation source L is mounted.
- Alignment pins 12c may optionally be provided which may insert in corresponding openings 12d, as exemplified in Figure 12 .
- Figures 12 and 13 further highlight the broken line shape of the plan profile of parts 12a and 12b.
- both parts 12a, 12b by snap-fit formations, e.g. comprising spring teeth 12e engaging corresponding eyelets or openings 12f.
- One or more embodiments as exemplified herein overcome possible limitations due to the distance from the light radiation source, because they enable an arrangement of the reflective surfaces at a farther distance from the light radiation source than it would be possible with a lens. The consequence is a lower irradiation of the optical surfaces, with a lower operating temperature and a lower light absorption in the blue range.
- the use of a reflector may be competitive in terms of cost as compared to the use of lenses, both in extended light radiation sources and in clustered or spread sources.
- the light radiation emitted by the source is optically masked by the reflector, i.e. it is not visible by an observer practically from all viewpoints. This is particularly true for angles of 75-90° with respect to the reflector axis, which reduces the glare perceived by the observers as compared with lenses.
- One or more embodiments may show a reduced sensitivity towards manufacturing and assembling tolerances, for example because the parametric focal distance is higher in comparison with mechanical tolerances.
- the possibility to implement reflective sides 120, 122, 124 as parametric reflectors may simplify the design from an optical point of view, because it requires the handling of fewer parameters (focus, curvature, aiming direction), therefore simplifying the designing activity.
- explicit equations are available to determine the projection of source L in the illumination space (e.g. on the lit road surface) given the position of the radiation source.
- the fractioning of the reflective surface e.g. the creation of Fresnel facets that are oriented vertically with respect to the light radiation source F, allows for tailoring the light source in the different areas of the lighting space, e.g. on the road surface to be lit.
- each surface portion e.g. each Fresnel facet
- each surface portion e.g. each Fresnel facet
- One or more embodiments achieve a high optical efficiency as well, because the reflector does not cover the light radiation source completely.
- the reflective source acts mainly through single reflection interactions, with the possibility for example to use the various elements of the reflector (e.g. various Fresnel facets) to direct the light radiation in controlled directions in the illumination space, enabling to direct a higher amount of light towards the illumination space.
- the various elements of the reflector e.g. various Fresnel facets
- One or various embodiments offer a high level of flexibility in tailoring the radiation pattern: providing independent reflective portions (for example independent Fresnel facets, each operating on a respective portion of the radiation pattern) makes it easier to adapt to different road scenarios.
- independent reflective portions for example independent Fresnel facets, each operating on a respective portion of the radiation pattern
- one or more embodiments may be used in contexts wherein, as previously mentioned, the mounting height h of luminaires 10 approximately corresponds to the width w of road surface S, and the distance i between neighbouring luminaires 10 amounts for example to 3.5 times the height h. Moreover, the possibility is given to adapt the amount of "overhang" of luminaire 10 projecting above the road surface (which is given by distance o of Figure 1 ) and of a possible tilting.
Abstract
Description
- The present description relates to reflectors for lighting devices.
- One or more embodiments may be employed, for example, in streetlighting applications.
- In technical lighting applications, e.g. in streetlighting, the need is felt of luminaires having design parameters or lighting patterns which may fulfil various road lighting requirements, guarantee proper lighting uniformity and avoid glaring for the drivers (called "observers") travelling along each lane, with a limited light cut off at the road edges (so called "surrounding ratio").
- The target values of these parameters may vary according to the different road classifications (ME1, ME2, S1, CE0, ...) and according to various factors (pole interspacing, pole height, etc.) which may impact on performance levels.
- Various implementations may involve the use of light radiation sources, e.g. solid-state LED radiation sources, combined with lenses. Each lens is adapted to provide a certain radiation pattern, with the possibility to fulfil road requirements in terms of light distribution on the road surface: by increasing the number of sources and lenses it is possible to increase the lighting flux up to the level required by the standards.
- Some implementations envisage a combination of different types of lenses (e.g. with different lighting patterns) and the assembly ("convolution") of the various radiation patterns originates the required final radiation pattern.
- The implementations based on the use of lenses are subjected to some drawbacks, which must be born in mind during development and production.
- The first important factor is the distance of the lens from the light radiation source: factors such as the temperature of the lens and/or the blue light density, for example from a LED, may degrade the performance of the polymer which forms a polymeric lens.
- The use of glass lenses may solve some of these drawbacks, but it may involve disadvantages as regards design and cost constraints.
- Another factor to consider is the effect of tolerances on optical performances: for example, mechanical tolerances from the manufacturing and assembling process are comparable to the lens focal distance (around 1/10 mm in both cases); therefore, a given lens may be optimized only for a specific source of light radiation, e.g. only for one specific LED.
- In addition, some lighting sources may be visible from all directions and cause discomfort to observers, with a possible undesired light spillage at high angles.
- Other implementations may envisage the use of reflectors. They may be freeform reflectors for clustered solutions, or small freeform/conic shaped reflectors which are coupled to each light radiation source in distributed solutions. A drawback of these solutions regards optical efficiency, which may be reduced by multiple reflections and by the limited reflectivity of the reflector (usually about 85%). Moreover, in the case of freeform reflectors, it is necessary to consider the design complexity.
- One or more embodiments aim at overcoming the previously outlined drawbacks.
- According to one or more embodiments, said object is achieved thanks to a reflector having the features specifically set forth in the claims that follow.
- One or more embodiments may also refer to a corresponding lighting device as well as a corresponding method.
- The claims are an integral part of the technical teaching provided herein with reference to the invention.
- One or more embodiments allow the achievement of one or more of the following advantages:
- flexibility and reduced complexity in achieving a tailored radiation pattern for a specific road scenario,
- flexibility in adapting the solution to different applications, e.g. for technical street lighting,
- limited dependence on manufacturing and assembling tolerances,
- higher optical efficiency with respect to current reflectors,
- reduced light spillage and glare at high angles.
- One or more embodiments will now be described, by way of non-limiting example only, with reference to the enclosed Figures, wherein:
-
Figure 1 schematically shows a possible application scenario of embodiments, -
Figure 2 is the view of a reflector according to embodiments, -
Figures 3 and4 are perspective views of a reflector according to embodiments, -
Figures 5 to 8 are various representative diagrams of implementation criteria of embodiments, -
Figures 9 to 11 exemplify the operation of embodiments, -
Figures 12 and 13 show possible implementations of embodiments, and -
Figures 14 and 15 show further embodiments. - It will be appreciated that, for a better clarity of illustration, the parts visible in the Figures are not to be considered necessarily drawn to scale.
- In the following description, numerous specific details are given to provide a thorough understanding of one or more exemplary embodiments. The embodiments may be practiced without one or several specific details, or with other methods, components, materials, etc. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring various aspects of the embodiments. Reference throughout this specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the possible appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
- The headings provided herein are for convenience only, and therefore do not interpret the scope or meaning of the embodiments.
-
Figure 1 shows a possible application context of one or more embodiments, specifically in the field of technical street lighting. - At any rate, the reference to such a possible application field is merely exemplary and not limitative of the embodiments.
- Specifically,
Figure 1 shows a part of a road S, of indefinite length, having a width w and being lit byluminaires 10 mounted e.g. on poles P. We may assume for example thatluminaires 10 may be separated by distance i, may be placed at a height h and may be mounted on poles P having the base at a certain distance from the edge of the road. - In one or more embodiments,
luminaires 10 may comprise (e.g. mounted in a respective housing, not visible in the Figures) areflector body 12, e.g. of a molded material, such as a lightweight metal material or plastic. -
Reflector 12 is designed to be coupled to a light radiation source L adapted to comprise for example an electrically powered light radiation source. - In one or more embodiments the source may be a solid-state source, such as for example ad LED source mounted on a PCB (Printed Circuit Board, not visible in the drawings).
- In any case, the specific features of the light radiation source L destined to be associated to
reflector 12 are not in themselves a compulsory aspect of the embodiments. - In one or more embodiments, light radiation source L (whatever it may be) may be designed to be placed in a given position, marked by point F. For simplicity of illustration, source L will hereinafter be identified with point F, therefore assuming for simplicity the presence of a point-shaped light radiation source.
- In one or more embodiments,
reflector 12 may have the function of reflecting the light emitted from light radiation source L, arranged in position F, towards an illumination space adapted to be identified, for instance, with road surface S. - In one or more embodiments,
reflector 12 may have an internal reflective surface having a substantially ribbon-like shape, possibly of a constant or substantially constant height. - Said reflective surface may therefore be seen as ideally enclosed between two end planes.
- In one or more embodiments, light radiation source L (point F) may be placed at one of such end planes, i.e. it may lie in one of such planes or in the vicinity thereof.
- Due to such placing in an end position, the light radiation emitted from source L may propagate towards said reflective surface, in order to be reflected thereby (according to ways described in the following), so as to be projected out of
luminaire 10 towards the illumination space, i.e. the space that must be lit (for example road surface S ofFigure 1 ). - In one or more embodiments, as exemplified in the Figures,
reflector 12 may have itself a generally ribbon-like shape. Said ribbon-like reflective surface may then be simply comprised of the inner surface ofreflector body 12, shaped and/or treated (e.g. with an aluminising treatment) so as to have (high) reflectivity. - In one or more embodiments, said reflective surface may be a multi-faceted surface, comprising several reflective sides or facets.
- In one or more embodiments, said multi-faceted reflective surface may comprise:
- a first and a second opposed reflective sides, respectively
front side 120 and backside 122, and - two further end sides joining
opposed sides - The denomination of
opposed sides reflector 12 with respect to road surface S in the Figures) is merely exemplary, and it only aims at facilitating the description and the comprehension of the embodiments. It must not therefore be interpreted as limitative of the embodiments. - As better explained in the following, each of the front 120, back 122 and end 124 sides is shaped and/or oriented so as to reflect the radiation coming from radiation source L, while directing it in a different direction of the illumination space.
- In one or more embodiments, as exemplified in the annexed Figures, said multi-faceted reflective surface comprising sides or
facets - In one or more embodiments, all said multi-faceted surface may be reflective. In one or more embodiments, said multi-faceted surface may comprise separating portions between reflective portions.
- In one or more embodiments, as exemplified in
Figures 2 to 12 , the front 120 and back 122 sides, on one hand, and the end sides 124, on the other hand, may constitute respectively the major and the minor sides of a multi-faceted reflective surface the plan view whereof is an approximately rectangular broken curve, the light radiation source L (point F) being arranged approximately in the middle (see for example the plan view ofFigure 2 ), i.e. in a central symmetry plane of the reflective surface. - In one or more embodiments, as exemplified in
Figures 14 and 15 , the multi-faceted reflective surface comprising facets orsides - In one or various embodiments, each of the
sides reflector 12, being able to reflect the light radiation of source L towards the illumination space in an independent way, i.e. via a single reflection: for example, a ray emitted by radiation source L meets the reflective surface only once. - In one or more embodiments, the
front side 120, theback side 122 and each of the end sides 124 of the reflective surface is so to say "dedicated" to sending the light radiation reflected thereby towards a direction of the illumination space which corresponds to a respective area of road surface S. - This possible operating mode is schematically exemplified in
Figures 9 to 11 , wherein: - the terminal or end
sides 124 may be designed to reflect the radiation of source L towards two end regions S3 of the lit road surface S below luminaire 10 (Figure 9 ), - back
side 122 may be designed to reflect the radiation of source L towards a portion S2 of road surface S on the side opposite the side whereluminaire 10 is mounted on respective pole P (Figure 10 ), and -
front side 120 may be designed to reflect the radiation of source L towards a portion S1 of the road surface S on the same side whereluminaire 10 is mounted on the respective pole P (Figure 11 ). - In order to be clearly understood and without limiting purposes, one or more embodiments as exemplified herein may be used in a context as the one explained with reference to
Figure 1 , wherein the height h of poles P approximately corresponds to the width w of road S, and the distance i separating poles P (i.e. luminaires 10) is approximately 3-4 times the height h. - By observing
Figures 9 to 11 it is moreover possible to understand that, in one or more embodiments, a reflecting mechanism may be implemented whereby at least some of the light beams reflected by the various facets orsides - For example, as schematically shown in
Figure 9 , illumination beams L3 reflected bysides 124 and directed towards the end regions S3 may cross while exitingluminaire 10, so that (referring by way of example only to the arrangement ofFigure 9 ): - light radiation L3 reflected by
plane 124 on the right is directed towards region S3 of road surface S disposed on the left, and - light radiation L3 reflected by
plane 124 on the left is directed towards region S3 of road surface S disposed on the right. - In a similar way, as schematically shown in
Figures 10 and11 , illumination beams L1 and 12 reflected byfront side 120 and backside 122 may cross while exitingluminaire 10, too, so that, always referring by way of example only to the relative arrangement shown inFigures 10 and11 : - light radiation L2 reflected by
back plane 122 is directed towards the upper region S2 of road surface S (i.e. the region farther away from luminaire 10), and - light radiation L1 reflected by
front plane 120 is directed towards the lower region S1 of road surface S (i.e. the region closer to luminaire 10). -
Figures 6 to 8 exemplify various criteria which may be used, in one or more embodiments, to implementsides reflector 12 according to parametric curves (ellipsoids, parabolas, spheres). - For example, in one or more embodiments, the reflective surfaces which correspond to the end sides 124 may be implemented so as to have a parabolic surface (a paraboloid), the focus of the parabola being disposed at point F where light radiation source L is arranged, and the axis of the parabola/paraboloid which describes the profile of said parabolic surface being oriented so as to direct the reflected radiation for example towards the areas S3 of the road surface which are farthest away from the mounting position of
luminaire 10. - In one or more embodiments, one or more parabolic profiles may be used, according to the space which must be lit, with the possibility of aiming each parabolic profile towards a different target area.
- The Figures exemplify moreover, with reference to the
front side 120 and theback side 122, the possibility to give the sides of the reflective surface a further multi-faceted shape, wherein one ormore sides - For example,
front side 120 may have a general gull-wing shape, with two symmetrical portions (referring to an ideal plane passing through point F) each of which comprises: - a
proximal part 120a, - a
middle part 120b, and - a
distal part 120c. - As used herein, the terms "proximal" and "distal" refer to the relative arrangement with respect to source L.
- A similar relative arrangement is also visible in
Figures 14 and 15 , wherein the reflective surface has an asymmetrical shape. - In one or more embodiments, at least one of the sides (e.g. the
back side 122, in the embodiments exemplified in the Figures) may be implemented as a Fresnel reflector, i.e. with a reflective surface divided into various facets F1, F2, F3, ... each of which may be named a "Fresnel facet". - In one or more embodiments, various facets F1, F2, F3, ... may be oriented vertically with respect to the lying plane of source L.
- In one or more embodiments, the profile of the facets of the Fresnel reflector may be described by a parametric curve.
- For example, the profile of each Fresnel facet may be described by a parabolic equation, wherein the focus of the parabola may be arranged at point F, where the light radiation source L lies, and the axis of the parabola/paraboloid describing the profile of the facet surface may be oriented so as to direct the reflected radiation towards a respective portion SF1, SF2, SF3 (see
Figure 5 above) of road surface S, i.e. in a respective direction of the illumination space. -
Figure 8 exemplifies how such a parametric criterion may be applied to different sides, so that for example the radiation reflected by one of the end sides 124 and the radiation reflected by thedistal portion 120c offront side 120 are directed towards respective portions S3 and S31 of road surface S, therefore, once again, in respective directions of the illumination space. - In one or more embodiments, one or more sides of the reflective surface (e.g. the facets of the Fresnel reflector of the back side 122) may optionally be filled with so-called "pillows" in order to broaden and smooth the light distribution.
- In one or more embodiments it is therefore possible to light the whole road surface S in a uniform way.
- As exemplified in
Figures 12 and 13 , in one or more embodiments thereflector body 12 may be formed by twoparts - The joining of both
parts openings 12d, as exemplified inFigure 12 . -
Figures 12 and 13 further highlight the broken line shape of the plan profile ofparts - In one or more embodiments it is possible to join both
parts spring teeth 12e engaging corresponding eyelets oropenings 12f. - Similar solutions may be adopted in one or more embodiments, for
reflectors 12 having an asymmetrical structure, as exemplified inFigures 14 and 15 . - One or more embodiments as exemplified herein overcome possible limitations due to the distance from the light radiation source, because they enable an arrangement of the reflective surfaces at a farther distance from the light radiation source than it would be possible with a lens. The consequence is a lower irradiation of the optical surfaces, with a lower operating temperature and a lower light absorption in the blue range.
- In one or more embodiments, the use of a reflector may be competitive in terms of cost as compared to the use of lenses, both in extended light radiation sources and in clustered or spread sources.
- In one or various embodiments, the light radiation emitted by the source is optically masked by the reflector, i.e. it is not visible by an observer practically from all viewpoints. This is particularly true for angles of 75-90° with respect to the reflector axis, which reduces the glare perceived by the observers as compared with lenses.
- One or more embodiments may show a reduced sensitivity towards manufacturing and assembling tolerances, for example because the parametric focal distance is higher in comparison with mechanical tolerances.
- In one or more embodiments, the possibility to implement
reflective sides - In one or more embodiments, the fractioning of the reflective surface, e.g. the creation of Fresnel facets that are oriented vertically with respect to the light radiation source F, allows for tailoring the light source in the different areas of the lighting space, e.g. on the road surface to be lit.
- In one or more embodiments it is possible, for example, to modify each surface portion (e.g. each Fresnel facet) according to the application scenario.
- One or more embodiments achieve a high optical efficiency as well, because the reflector does not cover the light radiation source completely.
- In one or more embodiments, the reflective source acts mainly through single reflection interactions, with the possibility for example to use the various elements of the reflector (e.g. various Fresnel facets) to direct the light radiation in controlled directions in the illumination space, enabling to direct a higher amount of light towards the illumination space.
- One or various embodiments offer a high level of flexibility in tailoring the radiation pattern: providing independent reflective portions (for example independent Fresnel facets, each operating on a respective portion of the radiation pattern) makes it easier to adapt to different road scenarios.
- For example, one or more embodiments may be used in contexts wherein, as previously mentioned, the mounting height h of
luminaires 10 approximately corresponds to the width w of road surface S, and the distance i between neighbouringluminaires 10 amounts for example to 3.5 times the height h. Moreover, the possibility is given to adapt the amount of "overhang" ofluminaire 10 projecting above the road surface (which is given by distance o ofFigure 1 ) and of a possible tilting. - Of course, without prejudice to the basic principle, the details and the embodiments may vary, even appreciably, with respect to what has been described herein by way of non-limiting example only, without departing from the extent of protection.
- The extent of protection is defined by the annexed claims.
Claims (10)
- A reflector for lighting devices including a reflector body (12) for reflecting light from a light radiation source (L) in an illumination space (S), wherein the reflector body (12) includes a ribbon-like multi-faceted reflective surface including a plurality of reflective sides (120, 122, 124) for directing light radiation reflected thereby in respective different directions (L1, L2, L3) in said illumination space (S).
- The reflector of claim 1, wherein said ribbon-like multi-faceted reflective surface (120, 122, 124) is an annular surface.
- The reflector of claim 1 or claim 2, wherein said ribbon-like multi-faceted reflective surface includes first (120) and second (122) opposed reflective sides joined by reflective end sides (124), said opposed (120, 122) and end (124) reflective sides for directing light radiation reflected thereby in respective different directions (L1, L2, L3) in said illumination space (S).
- The reflector of claim 3, wherein said opposed (120, 122) and end (124) reflective sides are major and minor sides, respectively, of said ribbon-like multi-faceted reflective surface.
- The reflector of any of the previous claims, wherein said reflective sides (120, 122, 124) include parabolic reflective surfaces.
- The reflector of any of the previous claims, wherein at least one (120, 122) of said reflective sides (120, 122, 124) includes a multi-faceted reflective surface (120a, 120b, 120c; F1, F2, F3).
- The reflector of claim 6, wherein said multi-faceted reflective surface includes Fresnel facets (F1, F2, F3).
- The reflector of any of the previous claims, wherein:- said reflector body (12) is a ribbon-like body having a ribbon-like inner reflective surface, and/or- said reflector body (12) includes two ribbon-like parts (12a, 12b) joined together.
- A lighting device including:- a light radiation source (L), preferably an electrically powered radiation source, and- a reflector according to any of claims 1 to 8 coupled to said light radiation source (L) for reflecting in an illumination space (S) light radiation from said light radiation source (L).
- A method of lighting an illumination space (S) including sending light radiation form a light radiation source (L) to a reflector body (12) having a ribbon-like multi-faceted reflective surface with a plurality of reflective sides (120, 122, 124) for directing light radiation reflected thereby in respective different directions in said illumination space (S).
Applications Claiming Priority (1)
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ITTO20140410 | 2014-05-23 |
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EP2947384B1 EP2947384B1 (en) | 2017-08-30 |
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EP15168705.0A Active EP2947384B1 (en) | 2014-05-23 | 2015-05-21 | A reflector for lighting devices, corresponding lighting device and method |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN112344293A (en) * | 2019-08-06 | 2021-02-09 | 日亚化学工业株式会社 | Lighting device |
Families Citing this family (1)
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US10697606B1 (en) | 2019-07-19 | 2020-06-30 | North American Lighting, Inc. | Vehicle lamp |
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GB2024397A (en) * | 1978-06-28 | 1980-01-09 | Itt | Road luminaire |
US4694382A (en) * | 1986-12-23 | 1987-09-15 | Hubbell Incorporated | Reflector for roadway lighting luminaire |
US6382803B1 (en) * | 2000-05-02 | 2002-05-07 | Nsi Enterprises, Inc. | Faceted reflector assembly |
US20070206384A1 (en) * | 2006-03-03 | 2007-09-06 | Compton Wayne W | Parking garage luminaire with interchangeable reflector modules |
US20080219008A1 (en) * | 2007-03-06 | 2008-09-11 | Canlyte Inc. | Lighting Device with Composite Reflector |
WO2010016118A1 (en) * | 2008-08-06 | 2010-02-11 | テスコ・エコライティング株式会社 | Lighting fixture |
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GB2024397A (en) * | 1978-06-28 | 1980-01-09 | Itt | Road luminaire |
US4694382A (en) * | 1986-12-23 | 1987-09-15 | Hubbell Incorporated | Reflector for roadway lighting luminaire |
US6382803B1 (en) * | 2000-05-02 | 2002-05-07 | Nsi Enterprises, Inc. | Faceted reflector assembly |
US20070206384A1 (en) * | 2006-03-03 | 2007-09-06 | Compton Wayne W | Parking garage luminaire with interchangeable reflector modules |
US20080219008A1 (en) * | 2007-03-06 | 2008-09-11 | Canlyte Inc. | Lighting Device with Composite Reflector |
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Publication number | Priority date | Publication date | Assignee | Title |
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CN112344293A (en) * | 2019-08-06 | 2021-02-09 | 日亚化学工业株式会社 | Lighting device |
EP3772610A1 (en) * | 2019-08-06 | 2021-02-10 | Nichia Corporation | Lighting device |
US11359792B2 (en) | 2019-08-06 | 2022-06-14 | Nichia Corporation | Lighting device |
CN112344293B (en) * | 2019-08-06 | 2023-12-08 | 日亚化学工业株式会社 | Lighting device |
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