EP2345839A1 - Dispositif d'éclairage à LED - Google Patents

Dispositif d'éclairage à LED Download PDF

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Publication number
EP2345839A1
EP2345839A1 EP10197095A EP10197095A EP2345839A1 EP 2345839 A1 EP2345839 A1 EP 2345839A1 EP 10197095 A EP10197095 A EP 10197095A EP 10197095 A EP10197095 A EP 10197095A EP 2345839 A1 EP2345839 A1 EP 2345839A1
Authority
EP
European Patent Office
Prior art keywords
light sources
support surface
light
relative
previous
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP10197095A
Other languages
German (de)
English (en)
Inventor
Mauro Favalli
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nadlec SRL
Original Assignee
Nadlec SRL
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 Nadlec SRL filed Critical Nadlec SRL
Publication of EP2345839A1 publication Critical patent/EP2345839A1/fr
Withdrawn legal-status Critical Current

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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
    • F21V5/00—Refractors for light sources
    • F21V5/007—Array of lenses or refractors for a cluster of light sources, e.g. for arrangement of multiple light sources in one plane
    • 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
    • F21V3/00—Globes; Bowls; Cover glasses
    • F21V3/02—Globes; Bowls; Cover glasses characterised by the shape
    • 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
    • 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
    • F21Y2107/00—Light sources with three-dimensionally disposed light-generating elements
    • F21Y2107/50—Light sources with three-dimensionally disposed light-generating elements on planar substrates or supports, but arranged in different planes or with differing orientation, e.g. on plate-shaped supports with steps on which light-generating elements are mounted
    • 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 a LED lighting device.
  • the device is applicable in road lighting plants as well as in the sector of civic lighting, internal and external.
  • LEDs i.e. light-emitting diodes
  • LEDs While up to a few years ago LEDs emitted a sufficient light to be used almost exclusively as indicators in electronic circuits, the advent of high-efficiency LEDs has made it possible to extend their use also to more versatile lighting apparatus.
  • high-efficiency LEDs are devices able to emit light (white or monochromatic) with a greater efficiency, and therefore lower consumption, than incandescent or halogen lamps.
  • the lighting devices developed up to now comprise lighting bodies of a flat, curved or circular type housing a plurality of LED light sources. Each lighting body, provided with a LED power supply, is mounted on a pole such as to form a street-lamp for lighting a tract of road.
  • LED light sources are in fact mounted in the lighting body in such a way as to emit light beams that are substantially parallel or convergent in a sole axis for illuminating a portion of road of defined dimensions and set at a precise distance from the lamp itself. It is clear that in order to illuminate tracts of road at variable distance from the lamp, the lighting body has to be appropriately directed. For example, the inclination of the light body can be varied with respect to the road surface, or the height thereof can be increased such as to generate a light cone that is directed as required.
  • a further drawback of the prior art is the high degree of light dispersion due to which only a percentage of the light emitted (less than 65%) effectively reaches and illuminates the predefined tract of road.
  • the aim of the present invention is to obviate the above-mentioned drawbacks and make available a LED lighting device which enables homogeneously and uniformly illuminating a predetermined surface.
  • a further aim of the present invention is to make available a LED lighting device which has a high degree of efficiency, while limiting as greatly as possible the light dispersion.
  • 1 denotes a LED lighting device, in particular for use in road lighting.
  • the device 1 comprises a support surface 2 and a plurality of LED light sources 3 arranged on the support 2 surface.
  • the light sources 3 are singly inclined with respect to the support surface 2 such as to emit light beams 5 destined to intersect in order to define converging volumes.
  • each of the light sources 3 is constituted by a monochromatic LED.
  • Each light source 3 preferably exhibits a different focal point with respect to the focal points of the other light sources 3.
  • the device 1 is provided with a filter 20 located as a cover of the light sources 3 such as to uniformly mix the light beams 5.
  • the filter 20 is preferably made of materials exhibiting refraction indices of between 1.3 and 1.9.
  • the filter 20 is advantageously multi-faceted, i.e. composed of contiguous flat faces 26 present in a number that is equal to the number of light sources 3.
  • Each face 26 of the filter 20 is originally associated to a corresponding light source 3 and is arranged orthogonally with respect to the light beam 5 coming from the corresponding light source 3.
  • An anti-reflection treatment is preferably performed on the filter 20 with the aim of increasing by up to 8% the overall efficiency of the device 1.
  • the support surface 2 is constituted by a portion 12 of a semi-cylindrical mantle. Such portion 12 is arranged such as to have a concavity 14 thereof substantially tangential to a predefined plane 6. In a further embodiment, illustrated in figure 10 , the support surface 2 is substantially flat.
  • the supports 15 and the support surface 2 preferably form a single body, i.e. they are obtained by shaping a single sheet of material.
  • the supports 15 are obtained by shaping a concave surface 12a of the portion 12 of the semi-cylindrical mantle.
  • the supports 15 can be mounted on the support surface 2.
  • the angles formed by each base 15a with respect to the support surface 2 can be modified such as to vary the distance of the convergence volumes with respect to the support surface 2.
  • the supports 15 are mounted on the concave surface 12a of the portion 12 of the semicylindrical mantle.
  • the angles formed by each base 15a with respect to the predefined plane 6 are modifiable such as to vary the distance of the convergence volumes with respect to the predefined plane 6.
  • Each light source 3 is preferably inclined in two directions with respect to the support surface 2.
  • each light source 3 is inclined with respect to the predefined plane 6 in a first inclination direction which is parallel to the longitudinal extension of the portion 12 of the semicylindrical mantle.
  • each light source 3, being mounted on the corresponding support 15, is inclined with respect to the predefined plane 6 in a second inclination direction, different from the first inclination direction.
  • each light source 3 is inclined in two directions with respect to said predefined plane 6 (and therefore also with respect to the support surface). Since the optical elements 4 are coaxial to the light sources 3, the optical elements 4 are also inclined in two directions with respect to the predefined plane 6.
  • the device 1 is advantageously provided with a dissipator 21 for dispersing the heat generated by the light sources 3.
  • the junction temperature of the LED light sources 3 must in fact be maintained below the thus-termed cold junction temperature for reasons connected with reliability.
  • the dissipator 21 preferably exhibits dissipating fins 22.
  • the device 1 preferably comprises a control circuit (not illustrated) of the light sources 3.
  • control circuit is subdivided into a plurality of modules destined to command lighting of groups of light sources 3.
  • each module of the control circuit commands lighting of a group of light sources 3 such that, in a case of malfunctioning of the module, the remaining modules (commanding other groups of light sources 3) continue to function correctly, enabling illumination, however partial.
  • the lighting body 23 of the device positioned at a height of 8 metres from the ground, can illuminate a surface of dimensions of 29 metres x 8 metres.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Led Devices (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
EP10197095A 2010-01-14 2010-12-27 Dispositif d'éclairage à LED Withdrawn EP2345839A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT000003A ITPR20100003A1 (it) 2010-01-14 2010-01-14 Dispositivo di illuminazione a led

Publications (1)

Publication Number Publication Date
EP2345839A1 true EP2345839A1 (fr) 2011-07-20

Family

ID=42732547

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10197095A Withdrawn EP2345839A1 (fr) 2010-01-14 2010-12-27 Dispositif d'éclairage à LED

Country Status (2)

Country Link
EP (1) EP2345839A1 (fr)
IT (1) ITPR20100003A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2031295A1 (fr) * 2007-08-29 2009-03-04 Asetronics AG Eclairage d'examen médical, en particulier dentaire
WO2009037720A1 (fr) * 2007-09-17 2009-03-26 Wissen Lux S.P.A. Dispositif d'éclairage à del
EP2058582A1 (fr) * 2007-11-12 2009-05-13 Siteco Beleuchtungstechnik GmbH Lampe à DEL
WO2009119929A1 (fr) * 2008-03-24 2009-10-01 Well-Light Inc. Appareil d’éclairage utilisant une diode électroluminescente
US20090244894A1 (en) * 2008-03-26 2009-10-01 Fu Zhun Precision Industry (Shen Zhen) Co., Ltd. Led assembly for led lamp consisting of multiple led units each having a heat sink
EP2107296A2 (fr) * 2008-04-05 2009-10-07 Es-System S.A. Système d'éclairage de route et dispositif d'éclairage de route
US20090257225A1 (en) * 2008-04-14 2009-10-15 Zhejiang Howell Illuminating Technology Co., Ltd. Method and device for lamp having multiple light illuminating angles

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2031295A1 (fr) * 2007-08-29 2009-03-04 Asetronics AG Eclairage d'examen médical, en particulier dentaire
WO2009037720A1 (fr) * 2007-09-17 2009-03-26 Wissen Lux S.P.A. Dispositif d'éclairage à del
EP2058582A1 (fr) * 2007-11-12 2009-05-13 Siteco Beleuchtungstechnik GmbH Lampe à DEL
WO2009119929A1 (fr) * 2008-03-24 2009-10-01 Well-Light Inc. Appareil d’éclairage utilisant une diode électroluminescente
US20090244894A1 (en) * 2008-03-26 2009-10-01 Fu Zhun Precision Industry (Shen Zhen) Co., Ltd. Led assembly for led lamp consisting of multiple led units each having a heat sink
EP2107296A2 (fr) * 2008-04-05 2009-10-07 Es-System S.A. Système d'éclairage de route et dispositif d'éclairage de route
US20090257225A1 (en) * 2008-04-14 2009-10-15 Zhejiang Howell Illuminating Technology Co., Ltd. Method and device for lamp having multiple light illuminating angles

Also Published As

Publication number Publication date
ITPR20100003A1 (it) 2011-07-15

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