WO2012080889A1 - Dispositif optique pour un appareil d'éclairage à diodes électroluminescentes formant une zone éclairée allongée - Google Patents

Dispositif optique pour un appareil d'éclairage à diodes électroluminescentes formant une zone éclairée allongée Download PDF

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Publication number
WO2012080889A1
WO2012080889A1 PCT/IB2011/055397 IB2011055397W WO2012080889A1 WO 2012080889 A1 WO2012080889 A1 WO 2012080889A1 IB 2011055397 W IB2011055397 W IB 2011055397W WO 2012080889 A1 WO2012080889 A1 WO 2012080889A1
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WO
WIPO (PCT)
Prior art keywords
optical device
diopter
exit
reflective surface
light
Prior art date
Application number
PCT/IB2011/055397
Other languages
English (en)
Inventor
Bertrand Jean-Bernard Navarro
Josselin Daniel Lavergne
Original Assignee
Koninklijke Philips Electronics N.V.
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 Koninklijke Philips Electronics N.V. filed Critical Koninklijke Philips Electronics N.V.
Publication of WO2012080889A1 publication Critical patent/WO2012080889A1/fr

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
    • G02B19/0033—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use
    • G02B19/0047—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source
    • G02B19/0061—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source the light source comprising a LED
    • G02B19/0066—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source the light source comprising a LED in the form of an LED array
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S8/00—Lighting devices intended for fixed installation
    • F21S8/08—Lighting devices intended for fixed installation with a standard
    • 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
    • F21V5/00—Refractors for light sources
    • F21V5/04—Refractors for light sources of lens shape
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
    • G02B19/0004—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed
    • G02B19/0028—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed refractive and reflective surfaces, e.g. non-imaging catadioptric systems
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
    • G02B27/0938—Using specific optical elements
    • G02B27/095—Refractive optical elements
    • 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]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L25/00—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof
    • H01L25/03—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes
    • H01L25/04—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers
    • H01L25/075—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00
    • H01L25/0753—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00 the devices being arranged next to each other
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/0001—Technical content checked by a classifier
    • H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
    • H01L33/58—Optical field-shaping elements

Definitions

  • the invention relates to an optical device for imparting a desired shape to a light beam.
  • This optical device is particularly relevant for lighting surfaces which have a great length with respect to their width, such as a road, a street or a motor way.
  • Figure 1 depicts a schematic perspective view of a road section 1 equipped with three street luminaires 11a, l ib, 11c.
  • the street luminaires, or candelabra comprise a luminaire post 111 and luminaire head 112.
  • Each street luminaire enlightens a respective street zone 12a, 12b, 12c of the road section 1, each street zone having a length L.
  • These enlightened street zones may be slightly overlapping in overlapping zones 13a, 13ab, 13bc, 13c.
  • optical systems for providing elongate beam might be provided.
  • the use of a 'peanut' -shaped lens is known from WO 2008/122941.
  • street luminaires are set back from the border 14 of the road section 1. For instance, they are erected on a pavement, on the border 14 of the road section 1.
  • an embodiment of the invention proposes an optical device for imparting an elongate shape to a light beam, said optical device comprising:
  • an exit diopter which comprises a first convergent section, a second convergent section and a divergent section bridging said first and second convergent sections
  • the internal reflective surface is arranged such that at least part of the light entering the optical device by the entry diopter is reflected on the internal reflective surface so as to exit the optical device by the exit diopter.
  • the use of a total internal reflection surface allows focusing light in a remote area without using bulky reflector systems.
  • the internally reflected light may be used to gives the same illumination pattern than the light emitted directly through the exit diopter. Therefore, the area of interest may be illuminated more efficiently.
  • the exit diopter comprises a recess having a rotationally symmetrical continuous surface constructed around a rotation axis perpendicular to the longitudinal axis, the rotationally symmetrical continuous surface corresponding to the internal reflection surface;
  • the rotationally symmetrical surface is a spherical surface or a quadric or two intersecting planes oriented such that at least part of the light entering the optical device 2010PF00776 3 by the entry diopter is reflected on the internal reflective surface so as to exit the optical device by the exit diopter; in a particular example, the rotationally symmetrical surface is continuous;
  • the exit diopter and the internal reflection surface have a common plane of symmetry, said plane of symmetry comprising the rotation axis;
  • the optical device comprises a second internal reflection surface, the first and second internal reflective surfaces being on either sides of the longitudinal axis, the second reflection surface being such that at least part of the light entering the optical device by the entry diopter is reflected on the second internal reflective surface so as to exit the optical device by the exit diopter;
  • the second internal reflective surface is oriented such that the light rays reflected by the second internal reflective surface follow the same general direction as the direction of the light rays reflected by the first internal reflective surface;
  • the internal reflective surface is arranged such that the light rays distribution of the light rays exiting the optical device by the exit diopter after being reflected on the internal reflective is substantially the same as the light rays distribution of the light rays exiting the optical device directly by the exit diopter without being reflected on the internal reflective surface;
  • the said entry diopter comprises at least one lodging arrangement for a light source
  • the internal reflective surface and at least one lodging are arranged such as to provide internal reflection of at least 75 %, for example 95%, of the light rays coming directly from the light source to the internal reflective surface.
  • Another embodiment of the invention proposes a luminaire head, useful in particular for street lighting, comprising a plurality of light emitting diodes (LED) each LED being arranged upstream of an optical device as claimed in claim 1, said optical devices having substantially the same bearing.
  • LED light emitting diodes
  • such a luminaire head may be quite thin thanks to the use of LEDs as miniature light sources.
  • the light-beam shapers all have substantially the same bearing, i.e. they are oriented towards the same direction, it is not necessary to 2010PF00776 4 provide reflectors to direct the light beams with the right angle relative to the road. This simplifies the manufacture of the luminaire heads.
  • FIG. 1 shows a schematic road section equipped with street luminaires
  • FIG. 2A shows different schematic views of a first embodiment of an optical device according to the invention, namely; a straight cross-section (Fig. 2A), a longitudinal cross- section (fig. 2B), a perspective view from above (fig. 2C) and a plane view from below (fig. 2D);
  • FIG. 3 depicts the 2D-path followed by light rays emitted by a punctual light source through an optical device as shown on figure 2;
  • FIG. 4 shows a plane view from below of a second embodiment of an optical device according to the invention
  • FIG. 5 shows a plane view from below of a third embodiment of an optical device according to the invention.
  • FIG. 6A shows a plane view from below of a fourth embodiment of an optical device according to the invention
  • FIG. 6B shows the 2D-path followed by light rays emitted by a punctual light source through said optical device
  • FIG. 7 show different schematic views of a fifth embodiment of an optical device according to the invention, namely; a longitudinal cross- section (Fig. 7A) and a plane view from below (fig. 7B).
  • a diopter is an optical surface which separates two light propagation media having different refractive indices.
  • Examples of light propagation media are, for instance, air, glass, polymethacrylate or other plastics.
  • a lens is a device that causes light to either converge or diverge. It is made from a piece of shaped material, such as glass, polymethacrylate or other plastics. Usually, a lens has at least two faces or diopters. A face, or a part thereof, may be planar (it is not curved), convex (bulging outwards from the lens) or concave (depressed into the lens).
  • a quadric is second-order surface.
  • a sphere has a quadric surface.
  • a metasurface is the surface of a metaball.
  • a metaball is defined as follows.
  • Each component Q of a metaball may be defined by a three-dimensional mathematical function fj(x,y,z) where x, y, z are the coordinates of a point in space.
  • a threshold value T is chosen. For each point (x,y,z) the sum S(x,y,z) of the contribution of each component of the metaball is computed and is compared to the threshold value T:
  • point (x,y,z) is inside the volume of the metaball; if S(x,y,z) is equal to the threshold value T, then point (x,y,z) is on the surface of the metaball, i.e. on the metasurface. Otherwise, point (x,y,z) is outside of the metaball.
  • the following inequality represents the volume enclosed in the metaball defined by components Q:
  • a sphere may be represented by the following equation, where (xo,yo,zo) are the coordinates of the center of the sphere and r is the radius of the sphere:
  • a cylinder with a z axis may be represented by the following equation, where r is the radius of the cylinder:
  • an optical device for imparting an elongate shape to a light beam.
  • Said optical device comprises a lens having an entry diopter, an exit diopter and an internal reflective surface.
  • the internal reflective surface is arranged such that at least part of the light entering the optical device by the entry diopter is reflected on the internal reflective surface so as to exit the optical device by the exit diopter.
  • the exit diopter comprises a first convergent section, a second convergent section and a divergent section bridging said first and second convergent sections.
  • said divergent section bridges smoothly said first and second convergent sections of the exit diopter.
  • the lens is designed so that it is capable of shaping a round light beam into an elongate light beam having a substantially homogeneous light intensity lengthwise.
  • LEDs light emitting diodes
  • Other light sources may be appropriate.
  • an advantage of LEDs is that they are miniature light sources.
  • the LEDs and their associated optical devices are arranged in a plurality of lines and rows.
  • the light beams By imparting an appropriate bearing to the light beams, it is possible to direct the elongate light beam towards a road and light it, instead of lighting straight down under the light head. Moreover, it is possible to lodge radiators behind the LEDs (i.e. opposite the optical device with respect to the LED) with minimal impact on the thinness of the luminaire head. Moreover, due to the high cost of power, the high efficiency of LEDs is beneficial.
  • the lens comprises a plane of symmetry and a centerline comprised in said plane of symmetry.
  • the exit diopter comprises a recess having a rotationally symmetrical continuous surface constructed around a rotation axis perpendicular to the centerline or to the plane of symmetry, the rotationally symmetrical continuous surface corresponding to the internal reflection surface.
  • the recess may be obtained either by trimming, of an optical lens or the lens may be molded as a single piece with such recess
  • Figures 2 show different views of a first embodiment of an optical device 2 according to the invention.
  • the optical device is an 2010PF00776 7 optical lens 2 comprising an entry diopter 3, an exit diopter 4 and an internal reflective surface 21.
  • the lens 2 has an entry diopter 3 which is concave.
  • the entry diopter 3 may be arranged as a lodging 31 for a light source.
  • the general shape of the entry diopter 3 may be for example spherical or quadric.
  • such a shape has a minimal impact on the light rays distribution. This means that, when going through such an entry diopter, for example a spherical diopter, the light rays distribution remains substantially unaffected.
  • a base surface 5 may be located at the basis of the lens 2, between the entry diopter 3 and the exit diopter 4 or the internal reflective surface 21.
  • the light source is preferably arranged with respect to the entry diopter 3, for instance in the lodging 31, so that no light goes directly through the base surface 5 from the light source.
  • substantially all the light that is emitted by the light source is directed towards the entry diopter 3.
  • said lodging 31 has an axis of symmetry which passes through said light source.
  • the base surface 5 is substantially inscribed in a base plane. This eases the manufacture of optical devices according to the invention, as well as the assembly of said optical devices in larger lighting devices.
  • the base surface may form an angle with plane IIA.
  • the base surface may comprise two symmetrical parts which form an angle plan IIA.
  • the exit diopter 4 comprises a first convergent section 41, a second convergent section 42 and a divergent section 43 bridging said first and second convergent sections 41, 42.
  • This allows for dispersing the round light beam, which is initially concentrated towards the divergent section, towards the convergent sections 41, 42.
  • the divergent section 43 contributes to enlargement of the exit light beam
  • the convergent sections 41, 42 contribute to contracting the exit light beam.
  • a proper balance there between allows for a satisfactory light homogeneity along the exit light beam.
  • the optical device 2 has a centerline linking the entry diopter 3 and the exit diopter 4, and is elongated along a longitudinal axis.
  • the convergent sections 41, 42 and the divergent section 43 are aligned along the longitudinal axis
  • the exit diopter 4 comprises a recess having the shape of a rotationally symmetrical continuous surface constructed around a rotation axis perpendicular to the longitudinal axis
  • the rotationally symmetrical continuous 2010PF00776 8 surface corresponds to the internal reflection surface 21.
  • said internal reflection surface is a planar surface.
  • the rotation axis forms an angle with the centerline being different from 90°. This angle depends on the desired direction of the reflected rays.
  • the exit diopter 41 comprises a recess having a rotationally symmetrical continuous surface having said rotationally symmetrical continuous surface.
  • said convergent sections 41, 42 of the exit diopter 4 comprise quadric surfaces, such as a spherical surface.
  • the rotationally symmetrical continuous surface of the exit diopter 4 of the optical device according to the invention is constructed with respect to two perpendicular planes of symmetry IIA, IIB, which are also perpendicular to the base plane in which the base surface 5 is inscribed. Planes IIA and IIB intersect on the centerline of the lens 2.
  • the light source is located on the centerline of the lens 2.
  • said lodging 31 has an axis of symmetry which passes through said light source.
  • the convergent sections 41, 42 are convex and comprise spherical surfaces. They contribute to a metasurface which also comprises a cylinder contribution in the bridging divergent section 43, so that the whole surface remains continuous, without break of slope.
  • the divergent section 43 derives from a cylinder the axis of which passes by the center of the two spheres from which the convergent sections 41, 42 derive. Depending on the desired application, the height of this cylinder may be equal to, or lower than, the distance of the two above-mentioned spheres. In order to obtain a divergent section 43, the radius of the cylinder may be lower than that of the spheres.
  • the contribution of the spheres to the metasurface is most significant, whereas in the divergent section, it is the contribution of the cylinder which is most significant.
  • the plan IIA is not only a plan of symmetry for the base surface, but also for the exit diopter 4 and the internal reflection surface 21.
  • this gives a better homogenous light intensity lengthwise.
  • the lens 2 has the general shape of a peanut shell, where a portion has been cut out.
  • this removed part forms a internal reflective surface 21. From the exit diopter point of view, this leads to the creation of a virtual light source, being the image of the real light source by the symmetry plane formed by the 2010PF00776 9 reflective surface 21.
  • the virtual light source is thus offset by twice the distance between the real light source and the surface of the recess.
  • Figure 3 illustrates some paths which are followed by light rays 70 emitted by a punctual light source 7 through the optical device presented figures 2 in the plan IIA.
  • the dashed lines 72 show the light rays which is obtained after reflection on the internal reflection surface 21 of the lens 2 according to the invention.
  • the light rays 72 are reoriented to a side of the lens 2 opposite to the side that comprises the internal reflection surface 21. This means that the level of illumination on an area of interest can be increased and/or the area of interest can be extended forward.
  • the internal reflection surface 21 is arranged such that at least part of the light reflected on the internal reflective surface 21 exits the optical device by the exit diopter 4.
  • the internal reflective surface 21 and the lodging 31 are arranged such as to provide internal reflection of at least 75 %, for example 95%, of the light rays coming directly from the light source to the internal reflective surface.
  • the internal reflection surface 21 is arranged such that the light striking said internal reflection surface 21 has a total internal reflection.
  • the external side of the internal reflection surface 21 may be coated with a reflective layer, for example a metallic layer.
  • the internal reflective surface 21 is arranged such that the light rays distribution of the light rays exiting the optical device by the exit diopter 4 after being reflected on the internal reflective face 21 is substantially the same as the light rays distribution of the light rays exiting the optical device 2 directly by the exit diopter 4 without being reflected on the internal reflective surface 21.
  • this contributes to a homogenous lighting of the area of interest, as a road section for example, along with an increase of the light intensity.
  • the shape of the internal reflection surface may be a planar surface as shown on the embodiment of figures 2.
  • a planar internal reflection surface does not change the spread of the light in the direction perpendicular to the road, and the orientation of the plane makes it possible to select where to send the reflected light. For instance, if the planar internal reflection surface has a right angle with the base surface, the reflected light distribution is substantially the same as the direct light distribution. This can be helpful to increase the illumination level on the road. 2010PF00776 10
  • planar internal reflection surface is tilted, the reflected light distribution will be shifted in angle and thus the reflected light illuminates a part of the road adjacent to the one lit by the direct light. This can be helpful to cover wider road.
  • the internal reflection surface 21 may comprise two intersecting planes arranged symmetrically to the plane 22.
  • the use of two intersecting planes may help to change the longitudinal light distribution to provide better illumination uniformity along the road direction.
  • the internal reflection surface 21 may be a spherical surface as shown in figure 5.
  • the focus of the reflected light beam may be adapted depending on the curvature (i.e. the position of the spherical surface relative to the light source). This allows controlling the width of the reflected light beam. With a convex spherical surface, the reflected light beam is spread and this improves the homogeneity of the illumination of the road.
  • rotationally symmetrical continuous surface can be any curb surface.
  • shape and the position of the total internal reflection surface can be advantageously optimized in order to get a perfect match depending on the application.
  • the inventors have compared the utilization factor, i.e. the ratio between the integrated light flux falling in the area of interest and the total light flux, of a lens without the total reflected surface with the utilization factor of an optical device according to the invention as shown in figure 5.
  • the utilization factor is strongly increased from 0.4 to 0.52 thanks to the internal reflection surface 21.
  • the lens comprises further to the specifications recited above a second total internal reflection surface 22 located opposite the first internal reflection surface 21 with respect to a plane defined by the centerline and the rotation axis.
  • the second reflection surface 22 is arranged such that at least part of the light entering the optical device by the entry diopter 3 is reflected on the second internal reflective surface 22 so as to exit the optical device by the exit diopter 4.
  • the second internal 2010PF00776 11 surface 22 can be any nurb surface. Preferably, it is a planar surface or a spherical surface or two intersecting planes or a quadric.
  • the lens has a plane of symmetry, and most preferably, it has the same plane of symmetry VIB as the entry diopter 3, the exit diopter 4 and the first internal reflective face 21.
  • the inclination of the first and second internal reflective surfaces is different.
  • this allows obtaining an asymmetrical light rays distribution exiting the lens.
  • Figure 6B illustrates some paths which are followed by light rays 70 emitted by a punctual light source 7 trough the optical device presented figure 6 A, in the plane VIB.
  • the light rays which would be obtained with a prior art optical device, i.e. without internal reflection surface 22, are represented by the dash-and-dot lines 71.
  • the dashed lines 72 show the light rays which are obtained after propagation of the same light through the lens 2 according to the invention.
  • the light rays are reoriented to a side of the lens 2.
  • the second internal reflective face 22 advantageously gathers the light exiting the lens with an angle greater than a desired value. This allows a better control of the size, the shape and the illumination of the area of interest.
  • a lens 200 comprises two entry diopters 301, 302 which are, in this instance, symmetrical with respect to each other.
  • Each entry diopter may be arranged as a lodging 311, 312 for a light source, such as a LED.
  • the entry diopters have a spherical surface, but this is not compulsory, as explained above.
  • the light sources are preferably located along the centerlines 221, 222 of the entry diopters 301, 302.
  • the exit diopter 400 comprises three convergent sections 401, 402, 403 and two divergent sections 404, 405.
  • the exit diopter 400 comprises a recess having a rotationally symmetrical continuous surface constructed around a rotation axis. It comprises a metasurface which results from the combinations of spheres (convergent sections) and cylinders (divergent sections).
  • the rotationally symmetrical continuous surface 21 is an internal reflection surface, for example a total internal reflection surface. The shape and position of said internal reflection surface can be adjusted as explained above.
  • Such a lens 200 may be used, for instance, for color mixing.
  • the light sources are chosen with different colors. With the embodiment of figure 7, the color of the exit light beam will change continuously lengthwise of the exit light beam, from substantially the color of the light source located in the lodging 311 to the color of the light source located in the lodging 312.
  • the lens 200 represented on figures 7 may also be used in order to simplify manufacture: only one lens is necessary in order to shape the light beam which is emitted by two light sources.
  • a more complex optical device may be designed, with three entry diopters: a central entry diopter will accommodate a light source having a first color, and two lateral entry diopters will each accommodate a light source having a second color.
  • the convergent sections of the exit diopter of the lens are laid out at the corners of a square, with divergent sections bridging consecutive corners, or opposite corners, or both consecutive and opposite corners.
  • a lens will impart an elongate, cross, shape to a light beam.
  • lenses 2, 200 are manufactured by compression molding or injection molding, according to well known techniques.
  • they are made with a transparent material.
  • This material may be colored or colorless, depending on the desired application.
  • an appropriate material is polymethacrylate, more specifically poly(methylmethacrylate).
  • Other transparent plastics may be used such as polycarbonates.

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

Abstract

L'invention porte sur un dispositif optique pour communiquer une forme allongée à un faisceau de lumière. Le dispositif optique selon l'invention est particulièrement approprié pour éclairer des surfaces qui ont une grande longueur par rapport à leur largeur, telles qu'une route, une rue ou une autoroute. Le dispositif optique comprend un dioptre d'entrée (3), un dioptre de sortie (4) qui comprend une première section convergente (41), une seconde section convergente (42) et une section divergente (43) pontant lesdites première et seconde sections convergentes, et une surface réfléchissante interne (21) agencée de sorte qu'au moins une partie de la lumière entrant dans le dispositif optique (2) par le dioptre d'entrée (3) soit réfléchie sur la surface réfléchissante interne (21) de façon à sortir du dispositif optique (2) par le dioptre de sortie (4).
PCT/IB2011/055397 2010-12-16 2011-12-01 Dispositif optique pour un appareil d'éclairage à diodes électroluminescentes formant une zone éclairée allongée WO2012080889A1 (fr)

Applications Claiming Priority (2)

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EP10306427.5 2010-12-16
EP10306427 2010-12-16

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014016227A1 (fr) * 2012-07-23 2014-01-30 Osram Gmbh Lentille, mosaïque de lentilles et dispositif d'éclairage
WO2014068497A1 (fr) 2012-11-05 2014-05-08 Koninklijke Philips N.V. Élément optique ayant une partie de surface de réflexion interne totale permettant une meilleure répartition de la lumière dans l'espace
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WO2017207683A1 (fr) 2016-06-04 2017-12-07 Swareflex Gmbh Lentille optique pour applications d'éclairage
CN109668121A (zh) * 2017-10-12 2019-04-23 欧司朗股份有限公司 透镜组件及照明模块

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014016227A1 (fr) * 2012-07-23 2014-01-30 Osram Gmbh Lentille, mosaïque de lentilles et dispositif d'éclairage
WO2014068497A1 (fr) 2012-11-05 2014-05-08 Koninklijke Philips N.V. Élément optique ayant une partie de surface de réflexion interne totale permettant une meilleure répartition de la lumière dans l'espace
DE202013012202U1 (de) 2012-11-05 2015-08-03 Koninklijke Philips N.V. Optisches Element mit einem TIR-Flächenabschnitt für verbesserte räumliche Lichtverteilung
RU2543528C2 (ru) * 2013-05-17 2015-03-10 Общество С Ограниченной Ответственностью "Новые Энергетические Технологии" Оптическая система вторичной светодиодной оптики
WO2017207683A1 (fr) 2016-06-04 2017-12-07 Swareflex Gmbh Lentille optique pour applications d'éclairage
CN109313325A (zh) * 2016-06-04 2019-02-05 施华法斯有限公司 用于照明目的的光学透镜
CN109668121A (zh) * 2017-10-12 2019-04-23 欧司朗股份有限公司 透镜组件及照明模块
CN109668121B (zh) * 2017-10-12 2022-10-04 欧司朗股份有限公司 透镜组件及照明模块

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