EP3015758B1 - Linear lighting device with light-emitting diodes and linear lens - Google Patents

Linear lighting device with light-emitting diodes and linear lens Download PDF

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Publication number
EP3015758B1
EP3015758B1 EP15191993.3A EP15191993A EP3015758B1 EP 3015758 B1 EP3015758 B1 EP 3015758B1 EP 15191993 A EP15191993 A EP 15191993A EP 3015758 B1 EP3015758 B1 EP 3015758B1
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EP
European Patent Office
Prior art keywords
linear
light
lighting device
face
lens
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Not-in-force
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EP15191993.3A
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German (de)
French (fr)
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EP3015758A1 (en
Inventor
Jérome Fourot
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Novaday International
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Novaday International
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Classifications

    • 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
    • F21V7/0091—Reflectors for light sources using total internal reflection
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S4/00—Lighting devices or systems using a string or strip of light sources
    • F21S4/20—Lighting devices or systems using a string or strip of light sources with light sources held by or within elongate supports
    • F21S4/28—Lighting devices or systems using a string or strip of light sources with light sources held by or within elongate supports rigid, e.g. LED bars
    • 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
    • F21V5/02—Refractors for light sources of prismatic shape
    • 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
    • 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
    • F21V13/00—Producing particular characteristics or distribution of the light emitted by means of a combination of elements specified in two or more of main groups F21V1/00 - F21V11/00
    • F21V13/02—Combinations of only two kinds of elements
    • F21V13/04—Combinations of only two kinds of elements the elements being reflectors and refractors
    • 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
    • F21V7/005—Reflectors for light sources with an elongated shape to cooperate with linear light sources
    • 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
    • F21Y2103/00—Elongate light sources, e.g. fluorescent tubes
    • F21Y2103/10—Elongate light sources, e.g. fluorescent tubes comprising a linear array of point-like light-generating elements
    • 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
    • F21Y2113/00—Combination of light sources
    • 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 invention relates to the technical field of lighting using light emitting diode (LED) light-emitting diode (LED) sources.
  • the invention relates more particularly to so-called linear LED lighting devices intended to be a substitute for lighting systems using fluorescent linear tubes with mercury vapor or other.
  • Fluorescent tube lighting such as, for example, used inside industrial buildings, especially in storage warehouses, implements luminaires fixed in height, and aligned to illuminate spans. Each luminaire then comprises one, two or three parallel linear fluorescent tubes. These inexpensive luminaires actually make it possible to produce light, but they do not make it possible to obtain satisfactory illumination at ground level or in a volume between the ground and a height of two meters, given the height at which they are generally located. , from 4 to 10 meters and how the tubes emit light on their entire periphery. Moreover, these luminaires do not make it possible to obtain an optimized electrical energy consumption and induce disturbances of the power supply networks to which they are connected because of their mode of operation and the systems used when they are switched on.
  • linear fluorescent tube luminaires are replaced by linear luminaires with light-emitting diodes.
  • each diode is associated with an individual optical system, said secondary lens which focuses and focuses the light, for example in a cone having an apex angle of about 20 ° to 30 °, so as to obtain the desired floor lighting.
  • the cover forms, in relation to each longitudinal row of light-emitting diodes, a linear lens, at least translucent, with a longitudinal axis parallel to the longitudinal axis of the body and symmetrical with respect to a sagittal plane, with a external light emitting face and an internal light receiving face of the diodes, whose transmitting face, seen in transverse cross-section, has a convex shape, and whose receiving face, seen in transverse cross-section , comprises a central convex diopter and, on either side of the central diopter, parallel prisms each having a medial and a partially flat at least lateral side face, the flat medial face portion of each prism forming with the sagittal plane an angle between 0 ° and 5 ° in absolute value, the flat portion of the side face of each prism forming with the sagittal plane an angle of between 10 ° and 70 ° in absolute value.
  • each row or array of light-emitting diodes, of such a linear lens makes it possible to obtain for each light-emitting diode a lighting cone having in a plane transverse to the axis of alignment of the diodes an angle at acute summit and for example between 20 ° and 60 °.
  • the lighting device according to the invention then makes it possible to provide a satisfactory ground lighting even when being located at a high height for example greater than 5 meters and of the order of ten meters. This without the need to implement at each light emitting diode a so-called secondary lens, ensuring a conditioning light emitted by the diode.
  • a light-emitting diode comprises a semiconductor wafer which, when subjected to a suitable potential difference, emits a blue light radiation, most often blue, which is converted into white or other light by a layer of phosphors covered, directly or associated with a light.
  • thickness of silicone, of a coating at least translucent and generally transparent forming a primary lens which comprises an outer emitting face of the light generated by the diode.
  • the primary lens of the diode most often emits light on a half-sphere.
  • the linear lens according to the invention allows, without individual secondary lens, to concentrate in a transverse plane the light emitted by the lighting device.
  • each light-emitting diode of the lighting device is devoid of individual secondary lens of concentration of the light.
  • a material or an object is translucent if it allows the light coming from a reception face to pass towards an emission face and beyond this without the elements situated on the the receiving face are visible, clearly distinguishable or identifiable. Still within the meaning of the invention, a material or an object is transparent if it allows the light coming from a reception face to pass towards an emission face and beyond this and the elements situated on the side of the receiving face are perfectly visible, clearly distinguishable or identifiable.
  • an at least translucent object or material is an object or material capable of having one or more gradations in the way in which it passes light or diffuses it between what would describe it as translucent and what would describe it as transparent.
  • the sagittal plane is a plane substantially parallel to the longitudinal axis of the row of diodes and parallel to the emission axes of the light emitting diodes or primary lenses thereof.
  • the depth of the grooves separating the prisms situated on the same side of the plane increases away from the sagittal plane, two consecutive prisms being separated by a longitudinal groove delimited by the lateral face of the plane. a prism and the medial face of the adjacent prism, the depth of the groove being measured between, on the one hand, a plane tangent to the apices of the two prisms delimiting the groove and, on the other hand, a plane tangent to the bottom of said groove.
  • the bottoms of the grooves are located on a curve which has a radius of curvature greater than or equal to 5 mm and whose concavity is oriented towards the light-emitting diodes.
  • the apices of the prisms are situated on a curve having a radius of curvature greater than or equal to 3 mm and whose concavity is oriented towards the light-emitting diodes.
  • each diode comprises a primary lens associated with a convex or plane emission face and the apex of each emission face of each diode is located at a distance from the top of the central diopter less than or equal to 6 mm and preferably between 1 mm and 4 mm.
  • the emission face of the linear lens has a radius of curvature greater than or equal to 8 mm.
  • the body comprises in the lighting chamber, in relation to each longitudinal row of light-emitting diodes, two planar reflectors extending parallel to the longitudinal axis of the body being located on both sides of the body. water from the receiving surface and forming, with each other, an angle of between 90 ° and 160 °.
  • the use of such reflectors makes it possible to increase the luminous efficiency of the lighting device according to the invention.
  • the apex of the primary lens of each diode is located between a plane passing through the lateral edges of the reflectors and a plane tangent to the top of the central diopter.
  • the apex of the primary lens of each diode is located between a plane passing through the vertices of the extreme lateral prisms and a plane tangent to the apex of the central diopter. This characteristic also makes it possible to optimize the concentration of light by the linear lens.
  • each linear lens has a measured thickness, between a plane tangential to the top of the central diopter and a plane tangential to the top of the emission face, greater than 1 mm and, preferably, between 2 mm and 6 mm.
  • each linear lens comprises at least three prisms on either side of the central diopter.
  • the body is made of metal.
  • a metal body ensures good evacuation of the heat generated by the light emitting diodes and their power supply.
  • the body is made in the form of a profile obtained by means of a die without this excluding the possibility of making the body in any other suitable manner, for example by folding.
  • the linear lighting device comprises several longitudinal rows of light emitting diodes parallel and distant from each other, each row being associated with a longitudinal lens.
  • the sagittal planes of the longitudinal linear lenses form acute angles with each other.
  • a lighting device according to the invention may be qualified linear lighting device insofar as it has one or more rows of light-emitting diodes, each row can be likened to a linear source of illumination.
  • a linear lighting device according to the invention generally has a length very much greater than the width of the lighting device without the invention excluding an embodiment of the lighting device in which it has a width very close to its width. length by the implementation of a sufficient amount of row of light emitting diodes.
  • the linear qualifier is nonetheless relevant insofar as it relates to the alignment direction of the rows of light-emitting diodes.
  • the linear lighting device 1 comprises an elongate body 2 which extends along a longitudinal axis L.
  • the elongated body 2 defines at least one receiving surface 3 of at least one substrate 4 carrying at least one row R of light-emitting diodes 5 according to the illustrated example, the elongated body 2 comprises a single receiving surface 3 which is substantially centered with respect to the elongate body 2 and on which is fitted a single substrate 4 carrying a single row R of diodes 5.
  • the substrate 4 may, for example, comprise a printed circuit board, abbreviated PCB for English "printed circuit board", on which the light emitting diodes 5 are soldered. Of course, the substrate 4 may be made in any other suitable manner to ensure the mechanical strength of the light emitting diodes 5 and their power supply.
  • each light-emitting diode 5 is associated, as is more particularly apparent from the figure 2 , to a primary lens 6 which has a convex transmission face 7 being understood that the emission face 7 could also be flat.
  • each light emitting diode 5 is devoid of individual secondary lens.
  • the elongated body 2 comprises two planar reflectors 10 located on either side of the receiving face 4.
  • the two planar reflectors 10 extend parallel to the longitudinal axis L and form one with the other, an angle ⁇ between 90 ° and 160 °.
  • the elongated body 2 defines with the receiving surface 3 and the planar reflectors 10 a lighting chamber 11 in which the array of light-emitting diodes R is intended to be partly at least enclosed.
  • the elongate body 2 also comprises, opposite the lighting chamber 11 with respect to the reflectors 10, a chamber 12 capable of receiving a supply system for the light-emitting diodes 5.
  • a chamber 12 capable of receiving a supply system for the light-emitting diodes 5.
  • the implementation such a chamber 12 is not necessary for producing the elongate body 2 of a linear lighting device according to the invention.
  • the lighting device also comprises an elongated linear hood 20 which at least partly closes the lighting chamber 11.
  • the hood 20 is also intended to let in or diffuse the light emitted by each row of light-emitting diodes R.
  • the cover 20 is made of an at least translucent and preferably transparent material such as for example a plastic material such as polymethyl methacrylate (PMMA), polyethylene terephthalate (PET) or polypropylene (PP) without this list being neither exhaustive nor exhaustive.
  • PMMA polymethyl methacrylate
  • PET polyethylene terephthalate
  • PP polypropylene
  • the cover 20 is also adapted to ensure a conditioning of the light emitted by each row of light-emitting diodes R.
  • the cover 20 forms in relation to each longitudinal row of light-emitting diodes a linear lens 21 parallel to the longitudinal axis L 2.
  • the cover 2 comprises a single linear lens 21.
  • each linear lens 21 is symmetrical with respect to a sagittal plane S substantially parallel to the longitudinal axis L.
  • the sagittal plane S forms a plane of symmetry of the chamber 11, the reflectors 10 then being the image of one another with respect to the sagittal plane S.
  • the linear lens 21 has an inner face 22 for receiving the light of the light-emitting diodes 5 and, opposite this reception face 22, an external light emitting face 23 of the light-emitting diodes 5.
  • the linear lens 21 as a whole ensures transmission of the light emitted by said light-emitting diodes 5.
  • the transmitting surface 23 has, in transverse cross-section, a preferably smooth convex shape with, preferably, a radius of curvature R23 greater than or equal to 8 mm.
  • the receiving face 22 is shaped so that the lens 21 forms a kind of linear Fresnel lens.
  • the reception face 22 comprises, when viewed in transverse cross-section, a central convex diopter 25 and on either side of the latter prisms parallel to the longitudinal axis L.
  • the receiving face 22 presents preferably at least three prisms on each side of the central diopter 25.
  • the receiving face comprises four prisms 26 to 29 on either side of the central diopter 25.
  • Each prism comprises a medial face 30, at least partially flat, situated on the side of the sagittal plane S and a lateral face 31, at least partly flat, located opposite the sagittal plane with respect to the medial face 30.
  • medial and lateral faces of each prism are substantially parallel to the longitudinal axis L.
  • the medial faces 30 and side 31 of the same prism join to form the apex 32 of the corresponding prism.
  • the medial and lateral faces 30 of two consecutive prisms meet to form a longitudinal groove 33 separating the prisms.
  • each longitudinal groove 33 is then measured between a plane tangent to the vertices 32 of the two prisms bordering the groove and a plane tangent to the bottom of the throat if it is curved or between a plane tangent to the vertices 32 of the two prisms bordering the throat and the bottom of the throat if the latter seen in cross section right.
  • the flat portion of the medial face 30 of each prism forms an angle between 0 ° and 5 ° in absolute value with the sagittal plane S.
  • the medial faces 30 converge towards the sagittal plane S in the direction of the emission face 23, or they are parallel to the sagittal plane S.
  • the flat portion of the lateral face 31 of each prism forms an angle between 10 ° and 70 ° in absolute value with the sagittal plane S.
  • the lateral faces converge towards the sagittal plane S at the opposite of the emission face 23.
  • the depth P of the grooves 33 separating the prisms located on the same side of the sagittal plane S increases away from the sagittal plane S.
  • the bottoms of the grooves 33 are then located on a curve C33 whose concavity is oriented towards the receiving face 22 and which has a radius of curvature greater than or equal to 5 mm.
  • the vertices 32 of the prisms are located on a curve C32 whose concavity is oriented towards the illumination chamber 11 and which has a radius of curvature greater than or equal to 3 mm.
  • the radius of curvature of the curve C33 passing through the bottoms 33 of the grooves is greater than or equal to the radius of curvature of the curve C32 passing through the vertices 32 of the prisms.
  • the apex of the emission face 7 of each light emitting diode 5 is situated at a distance d from the vertex of the central diopter 25 of less than or equal to 6 mm and, preferably, between 1 mm and 4 mm. This optimizes the luminous efficiency of the linear lighting device.
  • the top of the emission face 7 of the primary lens of each light-emitting diode 5 is, moreover, located between, on the one hand, a plane P32 tangent to or passing through the vertices. 32 of the two extreme lateral prisms 29 and, on the other hand, a plane tangent to the top of the central diopter 25.
  • the top of the emission face 7 of the primary lens of each light-emitting diode 5 is also located between a plane P10 passing through the lateral edges of the reflectors 10 and a plane tangential to the apex of the central diopter 25.
  • the linear lens 21 has a thickness E, measured between a plane tangent to the top of the central diopter 25 and a plane tangent to the top of the central diopter 25, greater than 1 mm and preferably between 2 mm and 6 mm.
  • a linear lighting device has a light output of at least 89%, the linear lens 21 collimating the light from the diodes 5 thanks, in particular, to linear prisms which allow, after total reflection internal to the linear lens 21, to redirect the light in a narrow cone while the planar reflectors ensure a recycling of light possibly reflected by the receiving face 22 and the light from the light emitting diode 5 which would not directly reaches the receiving face 22.
  • the lighting device described above in connection with the Figures 1 and 2 comprises a single row of light-emitting diodes R associated with a linear lens 21.
  • the linear lighting device 1 could comprise several rows of light-emitting diodes R each associated with a linear lens 21.
  • FIG 3 illustrates an alternative embodiment of a lighting device according to the invention comprising three rows R of light-emitting diodes 5. Each row is then associated with a linear lens 21 and two planar reflectors 10 located on the upper side of the row .
  • the body 2 then has, in the present case a conformation corresponding to the juxtaposition of three bodies such as that described in relation to the figure 1 and 2 .
  • the cover 20 integrates three linear lenses 21 each analogous to the linear lens described in connection with the Figures 1 and 2 .
  • the sagittal planes S of the three linear lenses 21 are parallel to one another.
  • the figure 4 illustrates an embodiment of a linear lighting device according to the invention comprising two rows R of light-emitting diodes arranged in two separate lighting chambers 11.
  • the sagittal planes S and S 'of linear lenses, each associated with a row R form an acute angle.
  • the linear lighting device 1 comprises a single body 2 which defines the two lighting chambers 11.
  • the lighting device according to this embodiment comprises a single cover which integrates the two lenses. linear 21.
  • the linear lighting device comprises three rows R of light-emitting diodes
  • the sagittal planes S, S'and S "of the linear lenses, each associated with a row R form acute angles with respect to one another.
  • the body 2 defines the three lighting chambers 11.
  • the lighting device 1 comprises three separate covers 20, 40, 41 and independent which each close a lighting chamber 11.
  • Each hood then integrates a linear lens 21 according to the invention and, for example, as described in connection with the Figures 1 and 2 .
  • each receiving surface 3 of the substrate 4 carrying the diodes 5 is formed by a groove of the body 2 whose bottom is located above the departure of the planar reflectors.
  • the receiving surface 3 could be formed by a single flat face from which the planar reflectors extend.

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

Description

La présente invention concerne le domaine technique de l'éclairage au moyen de sources lumineuses à diodes électroluminescentes en abrégé LED pour en anglais « Light-Emitting Diode ». L'invention se rapporte plus particulièrement aux dispositifs d'éclairage à LED dit linéaires destinés à venir se substituer aux systèmes d'éclairage mettant en oeuvre des tubes fluorescents linéaires à vapeur de mercure ou autre.The present invention relates to the technical field of lighting using light emitting diode (LED) light-emitting diode (LED) sources. The invention relates more particularly to so-called linear LED lighting devices intended to be a substitute for lighting systems using fluorescent linear tubes with mercury vapor or other.

Un éclairage à tubes fluorescents tel que, par exemple, utilisé à l'intérieur des bâtiments industriels notamment dans les entrepôts de stockage, met en oeuvre des luminaires fixés en hauteur, et alignés pour éclairer des travées. Chaque luminaire comprend alors un, deux voire trois tubes fluorescents linéaires parallèles. Ces luminaires peu chers permettent effectivement de produire de la lumière mais de permettent pas d'obtenir un éclairage satisfaisant au niveau du sol ou dans un volume compris entre le sol et une hauteur de deux mètres compte tenu de la hauteur à laquelle ils sont généralement situés, de 4 m à une dizaine de mètre et de la façon dont les tubes émettent de la lumière sur toute leur périphérie. De plus, ces luminaires ne permettent pas d'obtenir une consommation d'énergie électrique optimisée et induisent des pertubations des réseaux d'alimentation électrique auxquels ils sont raccordés en raison de leur mode de fonctionnement et des systèmes mis en oeuvre à leur allumage.Fluorescent tube lighting such as, for example, used inside industrial buildings, especially in storage warehouses, implements luminaires fixed in height, and aligned to illuminate spans. Each luminaire then comprises one, two or three parallel linear fluorescent tubes. These inexpensive luminaires actually make it possible to produce light, but they do not make it possible to obtain satisfactory illumination at ground level or in a volume between the ground and a height of two meters, given the height at which they are generally located. , from 4 to 10 meters and how the tubes emit light on their entire periphery. Moreover, these luminaires do not make it possible to obtain an optimized electrical energy consumption and induce disturbances of the power supply networks to which they are connected because of their mode of operation and the systems used when they are switched on.

Avec le développement des diodes électroluminescentes, les luminaires à tube fluorescents linéaires sont remplacés par des luminaires linéaires à diodes électroluminescentes. Afin d'assurer un éclairage au sol de qualité, lorsque le luminaire est situé à une grande hauteur, il est proposé d'associer chaque diode avec un système optique individuel, dit lentille secondaire qui concentre et focalise la lumière, par exemple dans un cône ayant un angle au sommet d'environ 20° à 30°, de manière à obtenir l'éclairage au sol recherché.With the development of light-emitting diodes, linear fluorescent tube luminaires are replaced by linear luminaires with light-emitting diodes. In order to ensure quality ground lighting, when the luminaire is located at a great height, it is proposed to associate each diode with an individual optical system, said secondary lens which focuses and focuses the light, for example in a cone having an apex angle of about 20 ° to 30 °, so as to obtain the desired floor lighting.

Cependant, la mise en oeuvre des systèmes optiques individuels associés à chaque diode renchéri fortement le coût de fabrication du luminaire ce qui peut être rédhibitoire pour les éclairages en milieu industriel notamment.However, the implementation of individual optical systems associated with each diode greatly increased the manufacturing cost of the luminaire which can be prohibitive for lighting in industrial environment in particular.

Il est donc apparu le besoin, d'un nouveau type de dispositif d'éclairage linéaire adapté pour assuré un éclairage au sol satisfaisant a partir d'une grande hauteur tout en présentant un coût de fabrication très nettement inférieur à celui des luminaires comprenant un système optique de concentration de la lumière associé à chaque diode électroluminescente.It has therefore emerged the need for a new type of linear lighting device adapted to ensure satisfactory floor lighting from a great height while having a manufacturing cost much lower than that of luminaires comprising a system. optical concentration of light associated with each light emitting diode.

Afin d'atteindre cet objectif, l'invention concerne un dispositif d'éclairage linéaire à diodes électroluminescentes comprenant au moins :

  • un corps allongé comprenant au moins une surface de réception d'au moins un substrat portant au moins une rangée de diodes électroluminescentes alignées selon un axe longitudinal du corps et délimitant, en partie au moins, au moins une chambre d'éclairage linéaire allongée dans laquelle la rangée de diodes est située,
  • un capot linéaire allongé fermant en partie au moins la chambre d'éclairage.
Un tel dispositif est connu de US 2012/0250309 A1 . On connaît également US 5,613,769 A , CN 103511974 A et CN 203501043 U .In order to achieve this objective, the invention relates to a linear lighting device with light-emitting diodes comprising at least:
  • an elongated body comprising at least one receiving surface of at least one substrate carrying at least one row of light-emitting diodes aligned along a longitudinal axis of the body and at least partially delimiting at least one elongate linear illumination chamber in which the row of diodes is located,
  • an elongate linear hood partially closing at least the lighting chamber.
Such a device is known to US 2012/0250309 A1 . It is also known US 5,613,769 A , CN 103511974 A and CN 203501043 U .

Selon l'invention, le capot forme, en relation avec chaque rangée longitudinale de diodes électroluminescentes, une lentille linéaire, au moins translucide, d'axe longitudinal parallèle à l'axe longitudinal du corps et symétrique par rapport à un plan sagittal, avec une face externe d'émission de la lumière et une face interne de réception de la lumière des diodes, dont la face d'émission, vue en section droite transversale, possède une forme convexe, et dont la face de réception, vue en section droite transversale, comprend un dioptre central convexe et, de part et d'autre du dioptre central, des prismes parallèles ayant chacun une face médiale et une face latérale en partie au moins planes, la partie plane de face médiale de chaque prisme formant avec le plan sagittal un angle compris entre 0° et 5° en valeur absolue, la partie plane de la face latérale de chaque prisme formant avec le plan sagittal un angle compris entre 10° et 70° en valeur absolue.According to the invention, the cover forms, in relation to each longitudinal row of light-emitting diodes, a linear lens, at least translucent, with a longitudinal axis parallel to the longitudinal axis of the body and symmetrical with respect to a sagittal plane, with a external light emitting face and an internal light receiving face of the diodes, whose transmitting face, seen in transverse cross-section, has a convex shape, and whose receiving face, seen in transverse cross-section , comprises a central convex diopter and, on either side of the central diopter, parallel prisms each having a medial and a partially flat at least lateral side face, the flat medial face portion of each prism forming with the sagittal plane an angle between 0 ° and 5 ° in absolute value, the flat portion of the side face of each prism forming with the sagittal plane an angle of between 10 ° and 70 ° in absolute value.

La mise en oeuvre, avec chaque rang ou rangée de diodes électroluminescentes, d'une telle lentille linaire permet d'obtenir pour chaque diode électroluminescente un cône d'éclairage présentant dans un plan transversal à l'axe d'alignement des diodes un angle au sommet aigu et par exemple compris entre 20° et 60°. Le dispositif d'éclairage selon l'invention permet alors d'assurer un éclairage au sol satisfaisant même en étant situé à une hauteur importante par exemple supérieure à 5 mètres et de l'ordre d'une dizaine de mètres. Cela sans qu'il soit nécessaire de mettre en oeuvre au niveau de chaque diode électroluminescente une lentille, dite secondaire, assurant un conditionnement la lumière émise par la diode.The implementation, with each row or array of light-emitting diodes, of such a linear lens makes it possible to obtain for each light-emitting diode a lighting cone having in a plane transverse to the axis of alignment of the diodes an angle at acute summit and for example between 20 ° and 60 °. The lighting device according to the invention then makes it possible to provide a satisfactory ground lighting even when being located at a high height for example greater than 5 meters and of the order of ten meters. This without the need to implement at each light emitting diode a so-called secondary lens, ensuring a conditioning light emitted by the diode.

Généralement une diode électroluminescente comprend une plaquette semiconductrice qui émet, lorsqu'elle est soumise à une différence de potentiel adaptée, un rayonnement lumineux le plus souvent bleu qui est converti en lumière blanche ou autre par une couche de luminophores recouverte, directement ou associée à une épaisseur de silicone, d'un revêtement au moins translucide et généralement transparent formant une lentille primaire laquelle comprend une face externe d'émission de la lumière générée par la diode. La lentille primaire de la diode émet le plus souvent la lumière sur une demi-sphère. La lentille linéaire selon l'invention permet, sans lentille secondaire individuelle, de concentrer dans un plan transversal la lumière émise par le dispositif d'éclairage. Ainsi, selon une caractéristique préférée mais non strictement nécessaire de l'invention, chaque diode électroluminescente du dispositif d'éclairage est dépourvue de lentille secondaire individuelle de concentration de la lumière.Generally, a light-emitting diode comprises a semiconductor wafer which, when subjected to a suitable potential difference, emits a blue light radiation, most often blue, which is converted into white or other light by a layer of phosphors covered, directly or associated with a light. thickness of silicone, of a coating at least translucent and generally transparent forming a primary lens which comprises an outer emitting face of the light generated by the diode. The primary lens of the diode most often emits light on a half-sphere. The linear lens according to the invention allows, without individual secondary lens, to concentrate in a transverse plane the light emitted by the lighting device. Thus, according to a preferred but not strictly necessary characteristic of the invention, each light-emitting diode of the lighting device is devoid of individual secondary lens of concentration of the light.

Au sens de l'invention, un matériau ou un objet est translucide s'il laisse passer la lumière en provenance d'une face de réception vers une face d'émission et au-delà de cette dernière sans que les éléments situés du côté de la face de réception soient visibles, clairement distinguables ou identifiables. Toujours au sens de l'invention, un matériau ou un objet est transparent s'il laisse passer la lumière en provenance d'une face de réception vers une face d'émission et au-delà de cette dernière et que les éléments situés du côté de la face de réception sont parfaitement visibles, clairement distinguables ou identifiables. Ainsi, un objet ou matériau au moins translucide est un objet ou matériau susceptible de présenter une ou plusieurs gradations dans la manière dont il laisse passer la lumière ou la diffuse entre ce qui le qualifierait de translucide et ce qui le qualifierait de transparent.Within the meaning of the invention, a material or an object is translucent if it allows the light coming from a reception face to pass towards an emission face and beyond this without the elements situated on the the receiving face are visible, clearly distinguishable or identifiable. Still within the meaning of the invention, a material or an object is transparent if it allows the light coming from a reception face to pass towards an emission face and beyond this and the elements situated on the side of the receiving face are perfectly visible, clearly distinguishable or identifiable. Thus, an at least translucent object or material is an object or material capable of having one or more gradations in the way in which it passes light or diffuses it between what would describe it as translucent and what would describe it as transparent.

Au sens de l'invention, le plan sagittal est un plan sensiblement parallèle à l'axe longitudinal de la rangée de diodes et parallèle aux axes d'émission des diodes électroluminescentes ou des lentilles primaires de ces dernières.In the sense of the invention, the sagittal plane is a plane substantially parallel to the longitudinal axis of the row of diodes and parallel to the emission axes of the light emitting diodes or primary lenses thereof.

Selon une forme de réalisation de l'invention, la profondeur des gorges séparant les prismes situés d'un même côté du plan augmente en s'éloignant du plan sagittal, deux prismes consécutifs étant séparés par une gorge longitudinale délimitée par la face latérale d'un prisme et la face médiale du prisme adjacent, la profondeur la gorge étant mesurée entre, d'une part, un plan tangent aux sommets des deux prismes délimitant la gorge et, d'autre part, un plan tangent au fond de ladite gorge.According to one embodiment of the invention, the depth of the grooves separating the prisms situated on the same side of the plane increases away from the sagittal plane, two consecutive prisms being separated by a longitudinal groove delimited by the lateral face of the plane. a prism and the medial face of the adjacent prism, the depth of the groove being measured between, on the one hand, a plane tangent to the apices of the two prisms delimiting the groove and, on the other hand, a plane tangent to the bottom of said groove.

Selon une caractéristique de cette forme de réalisation, les fonds des gorges sont situés sur une courbe qui présente un rayon de courbure supérieur ou égal à 5 mm et dont la concavité est orientée vers les diodes électroluminescente.According to a characteristic of this embodiment, the bottoms of the grooves are located on a curve which has a radius of curvature greater than or equal to 5 mm and whose concavity is oriented towards the light-emitting diodes.

Selon une autre caractéristique de cette forme de réalisation, les sommets des prismes sont situés sur une courbe présentant un rayon de courbure supérieur ou égal à 3 mm et dont la concavité est orientée vers les diodes électroluminescente.According to another characteristic of this embodiment, the apices of the prisms are situated on a curve having a radius of curvature greater than or equal to 3 mm and whose concavity is oriented towards the light-emitting diodes.

Selon une caractéristique de l'invention, chaque diode comprend une lentille primaire associée avec une face d'émission convexe ou plane et le sommet de chaque face d'émission de chaque diode est situé à une distance du sommet du dioptre central inférieure ou égale à 6 mm et, de préférence, comprise entre à 1 mm et 4 mm.According to one characteristic of the invention, each diode comprises a primary lens associated with a convex or plane emission face and the apex of each emission face of each diode is located at a distance from the top of the central diopter less than or equal to 6 mm and preferably between 1 mm and 4 mm.

Selon une caractéristique de l'invention, la face d'émission de la lentille linéaire présente un rayon de courbure supérieur ou égal à 8 mm.According to one characteristic of the invention, the emission face of the linear lens has a radius of curvature greater than or equal to 8 mm.

Selon une autre caractéristique de l'invention, le corps comprend dans la chambre d'éclairage, en relation avec chaque rangée longitudinale de diodes électroluminescentes, deux réflecteurs plans s'entendant parallèlement à l'axe longitudinal du corps en étant situés de part et d'eau de la surface de réception et formant, l'un avec l'autre, un angle compris entre 90° et 160°. La mise en oeuvre de tels réflecteurs permet d'augmenter le rendement lumineux du dispositif d'éclairage selon l'invention.According to another characteristic of the invention, the body comprises in the lighting chamber, in relation to each longitudinal row of light-emitting diodes, two planar reflectors extending parallel to the longitudinal axis of the body being located on both sides of the body. water from the receiving surface and forming, with each other, an angle of between 90 ° and 160 °. The use of such reflectors makes it possible to increase the luminous efficiency of the lighting device according to the invention.

Selon une variante de cette caractéristique, le sommet de la lentille primaire de chaque diode est situé entre un plan passant par les bords latéraux des réflecteurs et un plan tangent au sommet du dioptre central. Cette variante permet d'optimiser la concentration de la lumière par la lentille linéaire.According to a variant of this characteristic, the apex of the primary lens of each diode is located between a plane passing through the lateral edges of the reflectors and a plane tangent to the top of the central diopter. This variant makes it possible to optimize the concentration of light by the linear lens.

Selon une caractéristique de l'invention, le sommet de la lentille primaire de chaque diode est situé entre un plan passant par les sommets des prismes latéraux extrêmes et un plan tangent au sommet du dioptre central. Cette caractéristique permet également d'optimiser la concentration de la lumière par la lentille linéaire.According to one characteristic of the invention, the apex of the primary lens of each diode is located between a plane passing through the vertices of the extreme lateral prisms and a plane tangent to the apex of the central diopter. This characteristic also makes it possible to optimize the concentration of light by the linear lens.

Selon une autre caractéristique de l'invention, chaque lentille linéaire présente une épaisseur mesurée, entre un plan tangent au sommet du dioptre central et un plan tangent au sommet de la face d'émission, supérieure à 1 mm et, de préférence, comprise entre 2 mm et 6 mm.According to another characteristic of the invention, each linear lens has a measured thickness, between a plane tangential to the top of the central diopter and a plane tangential to the top of the emission face, greater than 1 mm and, preferably, between 2 mm and 6 mm.

Selon encore une autre caractéristique de l'invention, chaque lentille linéaire comprend au moins trois prismes de part et d'autre du dioptre central.According to yet another characteristic of the invention, each linear lens comprises at least three prisms on either side of the central diopter.

Selon une caractéristique de l'invention, le corps est réalisé en métal. Un tel corps en métal permet d'assurer une bonne évacuation de la chaleur générée par les diodes électroluminescentes et leur alimentation. De manière préférée, le corps est réalisé sous la forme d'un profilé obtenu au moyen d'une filière sans que cela exclu la possibilité de réaliser le corps de toute autre manière appropriée comme, par exemple, par pliage.According to one characteristic of the invention, the body is made of metal. Such a metal body ensures good evacuation of the heat generated by the light emitting diodes and their power supply. Preferably, the body is made in the form of a profile obtained by means of a die without this excluding the possibility of making the body in any other suitable manner, for example by folding.

Selon une caractéristique de l'invention, le dispositif d'éclairage linéaire comprend plusieurs rangées longitudinales de diodes électroluminescentes parallèles et distantes les unes des autres, chaque rangée étant associée à une lentille longitudinale.According to a characteristic of the invention, the linear lighting device comprises several longitudinal rows of light emitting diodes parallel and distant from each other, each row being associated with a longitudinal lens.

Selon une variante de cette caractéristique, les plans sagittaux des lentilles linéaires longitudinales forment des angles aigus les un avec les autres.According to a variant of this characteristic, the sagittal planes of the longitudinal linear lenses form acute angles with each other.

Bien entendu, les différentes caractéristiques, variantes et formes de réalisation du dispositif d'éclairage selon l'invention peuvent être associées les unes avec les autres selon diverses combinaisons dans la mesure où elles ne sont pas incompatibles ou exclusives les unes des autres.Of course, the different features, variants and embodiments of the lighting device according to the invention can be associated with each other in various combinations to the extent that they are not incompatible or exclusive of each other.

Par ailleurs, diverses autres caractéristiques de l'invention ressortent de la description annexée effectuée en référence aux dessins qui illustrent des formes non limitatives de réalisation d'un dispositif d'éclairage selon l'invention.

  • La figure 1 est une perspective schématique en vue partiellement éclatée d'un dispositif d'éclairage selon l'invention.
  • La figure 2 est une coupe transversale du dispositif d'éclairage illustré à la figure 1.
  • Les figures 3 à 5 sont des coupes transversales d'autres formes de réalisation d'un dispositif d'éclairage selon l'invention.
Il est à noter que sur ces figures les éléments structurels et/ou fonctionnels communs aux différentes variantes peuvent présenter les mêmes références.Furthermore, various other features of the invention appear from the attached description with reference to the drawings which illustrate non-limiting embodiments of a lighting device according to the invention.
  • The figure 1 is a schematic perspective view partially exploded of a lighting device according to the invention.
  • The figure 2 is a cross-section of the lighting device illustrated in figure 1 .
  • The Figures 3 to 5 are cross sections of other embodiments of a lighting device according to the invention.
It should be noted that in these figures the structural and / or functional elements common to the different variants may have the same references.

Un dispositif d'éclairage selon l'invention, désigné dans son ensemble par la référence 1 à la figure 1, peut être qualifié de dispositif d'éclairage linéaire dans la mesure où il présente une ou plusieurs rangées de diodes électroluminescentes, chaque rangée pouvant être assimilée à une source linéaire d'éclairage. Un dispositif d'éclairage linéaire selon l'invention présente généralement une longueur très nettement supérieure à la largeur du dispositif d'éclairage sans que l'invention exclue une forme de réalisation du dispositif d'éclairage dans laquelle il présente une largeur très proche de sa longueur par la mise en oeuvre d'une quantité suffisante de rang de diodes électroluminescentes. Le qualificatif linéaire n'en reste pas moins pertinent dans la mesure où il se rapporte à la direction d'alignement des rangées de diodes électroluminescentes.A lighting device according to the invention, designated as a whole by the reference 1 to the figure 1 , may be qualified linear lighting device insofar as it has one or more rows of light-emitting diodes, each row can be likened to a linear source of illumination. A linear lighting device according to the invention generally has a length very much greater than the width of the lighting device without the invention excluding an embodiment of the lighting device in which it has a width very close to its width. length by the implementation of a sufficient amount of row of light emitting diodes. The linear qualifier is nonetheless relevant insofar as it relates to the alignment direction of the rows of light-emitting diodes.

Le dispositif d'éclairage linéaire 1 comprend un corps allongé 2 qui s'étend selon un axe longitudinal L. Le corps allongé 2 définit au moins une surface 3 de réception d'au moins un substrat 4 portant au moins une rangée R de diodes électroluminescentes 5 alignées selon l'axe longitudinal L. Selon l'exemple illustré, le corps allongé 2 comprend une unique surface de réception 3 qui est sensiblement centrée par rapport au corps allongé 2 et sur laquelle est adapté un unique substrat 4 portant une seule rangée R de diodes 5. Le substrat 4 peut, par exemple, comprendre une carte de circuit imprimé, en abrégé PCB pour en anglais "printed circuit board", sur laquelle les diodes électroluminescentes 5 sont soudées. Bien entendu, le substrat 4 peut être réalisé de toute autre manière appropriée pour assurer la tenue mécanique des diodes électroluminescentes 5 ainsi que leur alimentation électrique.The linear lighting device 1 comprises an elongate body 2 which extends along a longitudinal axis L. The elongated body 2 defines at least one receiving surface 3 of at least one substrate 4 carrying at least one row R of light-emitting diodes 5 according to the illustrated example, the elongated body 2 comprises a single receiving surface 3 which is substantially centered with respect to the elongate body 2 and on which is fitted a single substrate 4 carrying a single row R of diodes 5. The substrate 4 may, for example, comprise a printed circuit board, abbreviated PCB for English "printed circuit board", on which the light emitting diodes 5 are soldered. Of course, the substrate 4 may be made in any other suitable manner to ensure the mechanical strength of the light emitting diodes 5 and their power supply.

Selon l'exemple illustré, chaque diode électroluminescente 5 est associée, comme cela ressort plus particulièrement de la figure 2, à une lentille primaire 6 qui possède une une face d'émission 7 convexe étant entendu que la face d'émission 7 pourrait également être plane. De plus, dans le cas présent chaque diode électroluminescente 5 est dépourvue de lentille secondaire individuelle.According to the illustrated example, each light-emitting diode 5 is associated, as is more particularly apparent from the figure 2 , to a primary lens 6 which has a convex transmission face 7 being understood that the emission face 7 could also be flat. In addition, in this case each light emitting diode 5 is devoid of individual secondary lens.

Selon l'exemple illustré, le corps allongé 2 comprend deux réflecteurs plans 10 situés de part et d'autre de la face de réception 4. Les deux réflecteurs plans 10 s'étendent parallèlement à l'axe longitudinal L et forment, l'un avec l'autre, un angle α compris entre 90° et 160°.According to the illustrated example, the elongated body 2 comprises two planar reflectors 10 located on either side of the receiving face 4. The two planar reflectors 10 extend parallel to the longitudinal axis L and form one with the other, an angle α between 90 ° and 160 °.

Le corps allongé 2 délimite avec la surface de réception 3 et les réflecteurs plans 10 une chambre d'éclairage 11 dans laquelle la rangée de diodes électroluminescentes R est destinée à se retrouver en partie au moins enfermée. Selon l'exemple illustré, le corps allongé 2 comprend également à l'opposé de la chambre d'éclairage 11 par rapport au réflecteurs 10 une chambre 12 susceptible de recevoir un système d'alimentation des diodes électroluminescentes 5. Bien entendu la mise en oeuvre d'une telle chambre 12 n'est pas nécessaire à la réalisation du corps allongé 2 d'un dispositif d'éclairage linéaire selon l'invention.The elongated body 2 defines with the receiving surface 3 and the planar reflectors 10 a lighting chamber 11 in which the array of light-emitting diodes R is intended to be partly at least enclosed. According to the illustrated example, the elongate body 2 also comprises, opposite the lighting chamber 11 with respect to the reflectors 10, a chamber 12 capable of receiving a supply system for the light-emitting diodes 5. Of course, the implementation such a chamber 12 is not necessary for producing the elongate body 2 of a linear lighting device according to the invention.

Le dispositif d'éclairage selon l'invention comprend également un capot linéaire allongé 20 qui ferme en partie au moins la chambre d'éclairage 11. Selon l'invention, le capot 20 est également destiné à laisser passer ou diffuser la lumière émise par chaque rangée de diodes électroluminescentes R. À cet effet, le capot 20 est réalisé dans un matériau au moins translucide et de préférence transparent telle que par exemple une matière plastique comme du polyméthacrylate de méthyle (PMMA), du polytéréphtalate d'éthylène (PET) ou encore du polypropylène (PP) sans que cette liste ne soit ni limitative, ni exhaustive.The lighting device according to the invention also comprises an elongated linear hood 20 which at least partly closes the lighting chamber 11. According to the invention, the hood 20 is also intended to let in or diffuse the light emitted by each row of light-emitting diodes R. For this purpose, the cover 20 is made of an at least translucent and preferably transparent material such as for example a plastic material such as polymethyl methacrylate (PMMA), polyethylene terephthalate (PET) or polypropylene (PP) without this list being neither exhaustive nor exhaustive.

Le capot 20 est également adapté pour assurer un conditionnement de la lumière émise par chaque rangée de diodes électroluminescentes R. À cet effet, le capot 20 forme en relation avec chaque rangée longitudinale de diodes électroluminescentes une lentille linéaire 21 parallèle à l'axe longitudinal L du corps 2. Selon l'exemple illustré figures 1 et 2, le capot 2 comprend une seule lentille linéaire 21.The cover 20 is also adapted to ensure a conditioning of the light emitted by each row of light-emitting diodes R. For this purpose, the cover 20 forms in relation to each longitudinal row of light-emitting diodes a linear lens 21 parallel to the longitudinal axis L 2. According to the illustrated example Figures 1 and 2 , the cover 2 comprises a single linear lens 21.

Selon l'invention, chaque lentille linéaire 21 est symétrique par rapport à un plan sagittal S sensiblement parallèle à l'axe longitudinal L. Lorsque le capot 20 est adapté sur le corps 2, le plan sagittal S forme un plan de symétrie de la chambre d'éclairage 11, les réflecteurs 10 étant alors l'image l'un de l'autre par rapport au plan sagittal S.According to the invention, each linear lens 21 is symmetrical with respect to a sagittal plane S substantially parallel to the longitudinal axis L. When the cap 20 is fitted on the body 2, the sagittal plane S forms a plane of symmetry of the chamber 11, the reflectors 10 then being the image of one another with respect to the sagittal plane S.

La lentille linéaire 21 possède une face interne 22 de réception de la lumière des diodes électroluminescentes 5 et, à l'opposé de cette face de réception 22, une face externe 23 d'émission de la lumière des diodes électroluminescentes 5. La lentille linéaire 21 assure dans son ensemble une transmission de la lumière émise par lesdites diodes électroluminescentes 5.The linear lens 21 has an inner face 22 for receiving the light of the light-emitting diodes 5 and, opposite this reception face 22, an external light emitting face 23 of the light-emitting diodes 5. The linear lens 21 as a whole ensures transmission of the light emitted by said light-emitting diodes 5.

Comme cela ressort de la figure 2, la surface d'émission 23 possède, en section droite transversale, une forme convexe de préférence lisse avec, de manière préférée, un rayon de courbure R23 supérieur ou égal à 8 mm.As is apparent from the figure 2 the transmitting surface 23 has, in transverse cross-section, a preferably smooth convex shape with, preferably, a radius of curvature R23 greater than or equal to 8 mm.

La face de réception 22 est quant à elle conformée de manière que la lentille 21 forme une sorte de lentille de Fresnel linéaire. Ainsi la face de réception 22 comprend, lorsqu'elle est vue en section droite transversale, un dioptre central 25 convexe et de part et d'autre de ce dernier des prismes parallèles à l'axe longitudinal L. La face de réception 22 présente de préférence au moins trois prismes de chaque côté du dioptre central 25. Selon l'exemple illustré, la face de réception comprend quatre prismes 26 à 29 de part et d'autre du dioptre central 25.The receiving face 22 is shaped so that the lens 21 forms a kind of linear Fresnel lens. Thus, the reception face 22 comprises, when viewed in transverse cross-section, a central convex diopter 25 and on either side of the latter prisms parallel to the longitudinal axis L. The receiving face 22 presents preferably at least three prisms on each side of the central diopter 25. According to the illustrated example, the receiving face comprises four prisms 26 to 29 on either side of the central diopter 25.

Chaque prisme comprend une face médiale 30, en partie au moins plane, située du côté du plan sagittal S et une face latérale 31, en partie au moins plane, située à l'opposé du plan sagittal par rapport à la face médiale 30. Les faces médiale et latérale de chaque prisme sont sensiblement parallèles à l'axe longitudinal L. Les faces médiale 30 et latérale 31 d'un même prisme se rejoignent pour former le sommet 32 du prisme correspondant. Par ailleurs, les faces médiale 30 et latérale 31 de deux prismes consécutifs se rejoignent pour former une gorge longitudinale 33 de séparation des prismes. La profondeur P de chaque gorge longitudinale 33 est alors mesurée entre un plan tangent aux sommets 32 des deux prismes bordant la gorge et un plan tangent au fond de la gorge si ce dernier est courbe ou entre un plan tangent aux sommets 32 des deux prismes bordant la gorge et le fond de la gorge si celui-ci anguleux vu en section droite transversale.Each prism comprises a medial face 30, at least partially flat, situated on the side of the sagittal plane S and a lateral face 31, at least partly flat, located opposite the sagittal plane with respect to the medial face 30. medial and lateral faces of each prism are substantially parallel to the longitudinal axis L. The medial faces 30 and side 31 of the same prism join to form the apex 32 of the corresponding prism. Furthermore, the medial and lateral faces 30 of two consecutive prisms meet to form a longitudinal groove 33 separating the prisms. The depth P of each longitudinal groove 33 is then measured between a plane tangent to the vertices 32 of the two prisms bordering the groove and a plane tangent to the bottom of the throat if it is curved or between a plane tangent to the vertices 32 of the two prisms bordering the throat and the bottom of the throat if the latter seen in cross section right.

Selon l'invention, la partie plane de la face médiale 30 de chaque prisme forme un angle compris entre 0° et 5° en valeur absolue avec le plan sagittal S. Ainsi, soit les faces médiales 30 convergent vers le plan sagittal S en direction de la face d'émission 23, soit elles sont parallèles au plan sagittal S.According to the invention, the flat portion of the medial face 30 of each prism forms an angle between 0 ° and 5 ° in absolute value with the sagittal plane S. Thus, either the medial faces 30 converge towards the sagittal plane S in the direction of the emission face 23, or they are parallel to the sagittal plane S.

Toujours selon l'invention, la partie plane de la face latérale 31 de chaque prisme forme un angle compris entre 10° et 70° en valeur absolue avec le plan sagittal S. Ainsi, les faces latérales convergent vers le plan sagittal S à l'opposé de la face d'émission 23.Still according to the invention, the flat portion of the lateral face 31 of each prism forms an angle between 10 ° and 70 ° in absolute value with the sagittal plane S. Thus, the lateral faces converge towards the sagittal plane S at the opposite of the emission face 23.

Selon l'exemple illustré, la profondeur P des gorges 33 séparant les prismes situés d'un même côté du plan sagittal S augmente en s'éloignant du plan sagittal S. De manière préférée, les fonds des gorges 33 se trouvent alors situés sur une courbe C33 dont la concavité est orientée vers la face de réception 22 et qui présente un rayon de courbure supérieur ou égal à 5 mm. De même et toujours de manière préférée, les sommets 32 des prismes se trouvent situés sur une courbe C32 dont la concavité est orientée vers la chambre d'éclairage 11 et qui présente un rayon de courbure supérieur ou égal à 3 mm. Il est à noter que de manière préférée le rayon de courbure de la courbe C33 passants par les fonds 33 des gorges est supérieur ou égal au rayon de courbure de la courbe C32 passant par les sommets 32 des prismes.According to the illustrated example, the depth P of the grooves 33 separating the prisms located on the same side of the sagittal plane S increases away from the sagittal plane S. Preferably, the bottoms of the grooves 33 are then located on a curve C33 whose concavity is oriented towards the receiving face 22 and which has a radius of curvature greater than or equal to 5 mm. Similarly and still preferably, the vertices 32 of the prisms are located on a curve C32 whose concavity is oriented towards the illumination chamber 11 and which has a radius of curvature greater than or equal to 3 mm. It should be noted that, preferably, the radius of curvature of the curve C33 passing through the bottoms 33 of the grooves is greater than or equal to the radius of curvature of the curve C32 passing through the vertices 32 of the prisms.

Par ailleurs, selon l'exemple illustré, le sommet de la face d'émission 7 de chaque diode électroluminescente 5 est situé à une distance d du sommet du dioptre central 25 inférieure ou égale à 6 mm et, de préférence, comprise entre 1 mm et 4 mm. Cela permet d'optimiser l'efficacité lumineuse du dispositif d'éclairage linéaire. Dans le cadre de l'exemple illustré, le sommet de la face d'émission 7 de la lentille primaire de chaque diode électroluminescente 5 est, de plus, situé entre, d'une part, un plan P32 tangent aux ou passant par les sommets 32 des deux prismes latéraux extrêmes 29 et, d'autre part, un plan tangent au sommet du dioptre central 25.Moreover, according to the illustrated example, the apex of the emission face 7 of each light emitting diode 5 is situated at a distance d from the vertex of the central diopter 25 of less than or equal to 6 mm and, preferably, between 1 mm and 4 mm. This optimizes the luminous efficiency of the linear lighting device. In the context of the illustrated example, the top of the emission face 7 of the primary lens of each light-emitting diode 5 is, moreover, located between, on the one hand, a plane P32 tangent to or passing through the vertices. 32 of the two extreme lateral prisms 29 and, on the other hand, a plane tangent to the top of the central diopter 25.

Dans le cas présent, le sommet de la face d'émission 7 de la lentille primaire de chaque diode électroluminescente 5 est également situé entre un plan P10 passant par les bords latéraux des réflecteurs 10 et un plan tangent au sommet du dioptre central 25.In the present case, the top of the emission face 7 of the primary lens of each light-emitting diode 5 is also located between a plane P10 passing through the lateral edges of the reflectors 10 and a plane tangential to the apex of the central diopter 25.

De plus, toujours selon l'exemple illustré, la lentille linéaire 21 présente une épaisseur E, mesurée entre un plan tangent au sommet du dioptre central 25 et un plan tangent au sommet du dioptre central 25, supérieure à 1 mm et de préférence comprise entre 2 mm et 6 mm.In addition, again according to the illustrated example, the linear lens 21 has a thickness E, measured between a plane tangent to the top of the central diopter 25 and a plane tangent to the top of the central diopter 25, greater than 1 mm and preferably between 2 mm and 6 mm.

Un dispositif d'éclairage linéaire, selon l'invention et tel qu'ainsi réalisé, présente un rendement lumineux de 89 % au moins, la lentille linéaire 21 collimatant la lumière issue des diodes 5 grâce, notamment, aux prismes linéaires qui permettent, après réflexion totale interne à la lentille linéaire 21, de rediriger la lumière dans un cône étroit tandis que les réflecteurs plan assurent un recyclage de la lumière éventuellement réfléchie par la face de réception 22 et de la lumière issue des diodes électroluminescentes 5 qui n'aurait pas directement atteint la face de réception 22.A linear lighting device, according to the invention and as thus produced, has a light output of at least 89%, the linear lens 21 collimating the light from the diodes 5 thanks, in particular, to linear prisms which allow, after total reflection internal to the linear lens 21, to redirect the light in a narrow cone while the planar reflectors ensure a recycling of light possibly reflected by the receiving face 22 and the light from the light emitting diode 5 which would not directly reaches the receiving face 22.

Le dispositif d'éclairage décrit précédemment en relation avec les figures 1 et 2, comprend une seule rangée de diodes électroluminescentes R associée à une lentille linéaire 21. Toutefois, selon l'invention, le dispositif d'éclairage linéaire 1 pourrait comprendre plusieurs rangées de diodes électroluminescentes R chacune associée à une lentille linéaire 21.The lighting device described above in connection with the Figures 1 and 2 , comprises a single row of light-emitting diodes R associated with a linear lens 21. However, according to the invention, the linear lighting device 1 could comprise several rows of light-emitting diodes R each associated with a linear lens 21.

Ainsi la figure 3, illustre une variante de réalisation d'un dispositif d'éclairage selon l'invention comprenant trois rangées R de diodes électroluminescentes 5. Chaque rangée est alors associée à une lentille linéaire 21 et à deux réflecteurs plan 10 situé de part et haute de la rangée. Le corps 2 possède alors, dans le cas présent une conformation correspondant à la juxtaposition de trois corps tels que celui décrit en relation avec les figure 1 et 2. De plus, le capot 20 intègre trois lentilles linéaires 21 chacune analogue à la lentille linéaire décrite en relation avec les figures 1 et 2.So the figure 3 , illustrates an alternative embodiment of a lighting device according to the invention comprising three rows R of light-emitting diodes 5. Each row is then associated with a linear lens 21 and two planar reflectors 10 located on the upper side of the row . The body 2 then has, in the present case a conformation corresponding to the juxtaposition of three bodies such as that described in relation to the figure 1 and 2 . In addition, the cover 20 integrates three linear lenses 21 each analogous to the linear lens described in connection with the Figures 1 and 2 .

Selon la variante de réalisation de la de la figure 3, les plans sagittaux S des trois lentilles linéaires 21 sont parallèles entre eux. Cependant une telle configuration n'est pas nécessaire. Ainsi, la figure 4 illustre une forme de réalisation d'un dispositif d'éclairage linéaire selon l'invention comprenant deux rangées R de diodes électroluminescentes disposées dans deux chambres d'éclairage distinctes 11. Selon cette forme de réalisation les plans sagittaux S et S' des lentilles linéaires, chacune associée à une rangée R, forment un angle aigu. Selon cette forme de réalisation, le dispositif d'éclairage linéaire 1 comprend un seul corps 2 qui définit les deux chambres d'éclairage 11. De même, le dispositif d'éclairage selon cette forme de réalisation comprend un seul capot qui intègre les deux lentilles linéaires 21.According to the variant embodiment of the figure 3 the sagittal planes S of the three linear lenses 21 are parallel to one another. However such a configuration is not necessary. So, the figure 4 illustrates an embodiment of a linear lighting device according to the invention comprising two rows R of light-emitting diodes arranged in two separate lighting chambers 11. According to this embodiment the sagittal planes S and S 'of linear lenses, each associated with a row R, form an acute angle. According to this embodiment, the linear lighting device 1 comprises a single body 2 which defines the two lighting chambers 11. Likewise, the lighting device according to this embodiment comprises a single cover which integrates the two lenses. linear 21.

Selon une autre forme de réalisation illustrée à la figure 5, le dispositif d'éclairage linéaire selon l'invention comprend trois rangées R de diodes électroluminescentes disposées dans trois chambres d'éclairage distinctes 11. Selon cette autre forme de réalisation, les plans sagittaux S, S'et S" des lentilles linéaires, chacune associée à une rangée R, forment des angles aigus les uns par rapport aux autres. Selon cette forme de réalisation le corps 2 délimite les trois chambres d'éclairage 11. Dans le cas présent, le dispositif d'éclairage 1 comprend trois capots 20, 40, 41 distincts et indépendants qui ferment chacun une chambre d'éclairage 11. Chaque capot intègre alors une lentille linéaire 21 selon l'invention et, par exemple, telle que décrite en relation avec les figures 1 et 2.According to another embodiment illustrated in figure 5 , the linear lighting device according to the invention comprises three rows R of light-emitting diodes In this other embodiment, the sagittal planes S, S'and S "of the linear lenses, each associated with a row R, form acute angles with respect to one another. this embodiment the body 2 defines the three lighting chambers 11. In this case, the lighting device 1 comprises three separate covers 20, 40, 41 and independent which each close a lighting chamber 11. Each hood then integrates a linear lens 21 according to the invention and, for example, as described in connection with the Figures 1 and 2 .

Selon les exemples illustrés et décrits précédemment, chaque surface 3 de réception du substrat 4 portant les diodes 5 est formée par une gorge du corps 2 dont le fond est situé au dessus du départ des réflecteurs plan. Toutefois, un tel mode de réalisation n'est pas strictement nécessaire et la surface de réception 3 pourrait être formée par une simple face plane à partir de laquelle s'étendent les réflecteurs plans.According to the examples illustrated and described above, each receiving surface 3 of the substrate 4 carrying the diodes 5 is formed by a groove of the body 2 whose bottom is located above the departure of the planar reflectors. However, such an embodiment is not strictly necessary and the receiving surface 3 could be formed by a single flat face from which the planar reflectors extend.

Bien entendu, différentes autres variantes du dispositif d'éclairage selon l'invention peuvent être envisagées dans le cadre des revendications annexées.Of course, various other variants of the lighting device according to the invention can be envisaged within the scope of the appended claims.

Par ailleurs, il doit être compris que plusieurs dispositifs d'éclairage linéaire selon l'invention peuvent être associés selon diverses combinaisons pour former un luminaire susceptible de reproduire des configurations analogues à celles des figures 4 et 5 ou tout autre configuration en fonction l'éclairage recherché.Furthermore, it should be understood that several linear lighting devices according to the invention can be combined in various combinations to form a luminaire capable of reproducing configurations similar to those of Figures 4 and 5 or any other configuration depending on the desired lighting.

Claims (15)

  1. Linear lighting device with light-emitting diodes comprising at least:
    - an elongated body (2) comprising at least one surface (3) for receiving at least one substrate (4) bearing at least one row (R) of light-emitting diodes (5) aligned along a longitudinal axis (L) of the body and defining, at least partially, at least one elongated linear lighting chamber (11) wherein the diodes (5) are located,
    - an elongated linear cover (20) closing the lighting chamber (11),
    characterised in that the cover (20) forms, in connection with each longitudinal row of light-emitting diodes (5), an at least translucent linear lens (21), having a longitudinal axis parallel with the longitudinal axis (L) of the body (2) and symmetrical with respect to a sagittal plane (S), with an outer light-emitting face (23) and an inner face (22) for receiving light from the diodes (5), of which the emitting face (23), viewed as a transversal cross-section, has a convex shape, and of which the receiving face (22), viewed as a transversal cross-section, comprises a convex central dioptre (25) and, on either side of the central dioptre, parallel prisms (26 to 29) each having a medial face (30) and a lateral face (31) which are at least partially planar, the planar portion of the medial face (30) of each prism forming with the sagittal plane (S) an angle between 0° and 5° in absolute values, the planar portion of the lateral face (31) of each prism forming with the sagittal plane (S) an angle between 10° and 70° in absolute values.
  2. Linear lighting device according to the preceding claim, characterised in that the depth of the grooves (33) separating the prisms located on the same side of the sagittal plane (S) increases on moving away from the sagittal plane (S), two successive prisms being separated by a longitudinal groove (33) defined by the lateral face (31) of a prism and the medial face (30) of the adjacent prism, the depth of the groove (33) being measured between, on one hand, a tangent plane to the vertices (32) of the two prisms defining the groove (33) and, on the other hand, a tangent plane to the bottom of said groove (33).
  3. Linear lighting device according to the preceding claim, characterised in that the bottoms of the grooves (33) are located on a curve (C33) which has a radius of curvature greater than or equal to 5 mm and the concavity whereof is oriented towards the light-emitting diodes (5).
  4. Linear lighting device according to one of claims 2 to 3, characterised in that the vertices (32) of the prisms are located on a curve (C32) having a radius of curvature greater than or equal to 3 mm and the concavity whereof is oriented towards the light-emitting diodes (5).
  5. Linear lighting device according to one of the preceding claims, characterised in that the body (2) comprises in the lighting chamber (11), in connection with each longitudinal row of light-emitting diodes, two planar reflectors (10) extending parallel with the longitudinal axis (L) of the body (2) while being located on either side of the receiving surface (3) and forming, with one another, an angle between 90° and 160°.
  6. Linear lighting device according to one of the preceding claims, characterised in that the emitting face (23) of the linear lens (21) has a radius of curvature greater than or equal to 8 mm.
  7. Linear lighting device according to one of the preceding claims, characterised in that each diode (5) comprises a primary lens (6) associated with a convex or planar emitting face (7) and in that the vertex of each emitting face (7) of each diode is located at a distance (d) from the vertex of the central dioptre (25) less than or equal to 6 mm.
  8. Linear lighting device according to claims 5 and 7, characterised in that the vertex of the primary lens (6) of each diode (5) is located between a plane passing through the lateral edges of the reflectors (10) and a tangent plane to the vertex of the central dioptre (25).
  9. Linear lighting device according to claim 7 or 8, characterised in that the vertex of the primary lens (6) of each diode (5) is located between a plane passing through the vertices (32) of the end lateral prisms and a tangent plane to the vertex of the central dioptre (25).
  10. Linear lighting device according to one of the preceding claims, characterised in that each linear lens (21) has a measured thickness (E), between a tangent plane to the vertex of the central dioptre (25) and a tangent plane to the vertex of the emitting face (23), greater than 1 mm.
  11. Linear lighting device according to one of the preceding claims, characterised in that each linear lens (21) comprises at least three prisms (26 to 28) on either side of the central dioptre (25).
  12. Linear lighting device according to one of the preceding claims, characterised in that the body (2) is made of metal.
  13. Linear lighting device according to the preceding claim, characterised in that each light-emitting diode (5) is devoid of an individual secondary light-concentrating lens.
  14. Linear lighting device according to one of the preceding claims, characterised in that it comprises a plurality of longitudinal rows (R) of parallel light-emitting diodes distant from one another, each row being associated with a longitudinal lens (21).
  15. Linear lighting device according to claim 14, characterised in that the sagittal planes of the longitudinal linear lenses (21) form acute angles with one another.
EP15191993.3A 2014-10-28 2015-10-28 Linear lighting device with light-emitting diodes and linear lens Not-in-force EP3015758B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1460365A FR3027653B1 (en) 2014-10-28 2014-10-28 LINEAR LIGHT EMITTING DEVICE WITH LIGHT EMITTING DIODE AND LINEAR LENS

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EP3015758A1 EP3015758A1 (en) 2016-05-04
EP3015758B1 true EP3015758B1 (en) 2017-07-12

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FR (1) FR3027653B1 (en)

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DE102017125245A1 (en) * 2017-10-27 2019-05-02 Siteco Beleuchtungstechnik Gmbh Cover for a light module, light module and light
CN115949893A (en) * 2022-11-24 2023-04-11 厦门普为光电科技有限公司 Lighting device with prism grid microstructure

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Publication number Priority date Publication date Assignee Title
US5613769A (en) * 1992-04-16 1997-03-25 Tir Technologies, Inc. Tir lens apparatus having non-circular configuration about an optical axis
US9016895B2 (en) * 2011-03-30 2015-04-28 Innovative Lighting, Inc. LED lighting fixture with reconfigurable light distribution pattern
CN103511974A (en) * 2013-10-25 2014-01-15 浙江晶日照明科技有限公司 Light distribution device of LED line lamp
CN203501043U (en) * 2013-10-25 2014-03-26 浙江晶日照明科技有限公司 Light distribution device for LED line lamps

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EP3015758A1 (en) 2016-05-04
FR3027653A1 (en) 2016-04-29

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