EP2191191A1 - Dispositif d'éclairage à del - Google Patents

Dispositif d'éclairage à del

Info

Publication number
EP2191191A1
EP2191191A1 EP07827696A EP07827696A EP2191191A1 EP 2191191 A1 EP2191191 A1 EP 2191191A1 EP 07827696 A EP07827696 A EP 07827696A EP 07827696 A EP07827696 A EP 07827696A EP 2191191 A1 EP2191191 A1 EP 2191191A1
Authority
EP
European Patent Office
Prior art keywords
leds
led
optical element
main lighting
ioe
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Withdrawn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
EP07827696A
Other languages
German (de)
English (en)
Inventor
Franco Venturini
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.)
WISSENLUX Srl
Original Assignee
WISSENLUX 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 WISSENLUX Srl filed Critical WISSENLUX Srl
Publication of EP2191191A1 publication Critical patent/EP2191191A1/fr
Withdrawn legal-status Critical Current

Links

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
    • F21V5/02—Refractors for light sources of prismatic shape
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • 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
    • 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
    • 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
    • F21Y2107/00—Light sources with three-dimensionally disposed light-generating elements
    • F21Y2107/10—Light sources with three-dimensionally disposed light-generating elements on concave supports or substrates, e.g. on the inner side of bowl-shaped supports
    • 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 illuminating device .
  • the invention relates to LED illuminating devices that are used in the lighting technical sector, i.e. for indoor lighting (in houses, offices, shops, warehouses, etc.) and outdoor lighting
  • LEDs that, due to the disadvantageous positioning of the light sources and/or the poor efficiency of the optical elements employed, supply quite insufficient illumination in terms of width of the lighted area or intensity of the light beam generated.
  • Another aim of the present invention is to make available a LED illuminating device capable of illuminating in a homogeneous and uniform manner.
  • a further aim of the invention is to provide a LED illuminating device having a simple and cheap structure and a reduced manufacturing complexity.
  • FIG. 1 diagrammatically shows a plan view of a device in accordance with the invention, with some- parts removed for a better view of others;
  • FIG. 2 diagrammaticaliy shows a section view, taken along line II-II, of the device in Fig. 1;
  • - Fig. 3a diagrammatically shows a plan view of an element of the device of the invention
  • - Fig. 3b diagrammatically shows a perspective view to an enlarged scale of a detail seen in Fig. 3a;
  • FIG. 4a shows an alternative embodiment of the element seen in Fig. 3a;
  • FIG. 4b diagrammatically shows a perspective view to an enlarged scale of a detail in Fig. 4a;
  • - Fig. 5 is a diagrammatic plan view of a further embodiment of a device in accordance with the invention, with some parts removed for a better view of others;
  • - Fig. 6 is a diagrammatic section, view, taken along line VI-VI, of the device in Fig. 5;
  • Figs. 7 and 8 diagrammatically show part of the operation of the device in Fig. 1 and of a detail of same .
  • a LED illuminating device in accordance with the present invention has been generally identified with reference numeral 1.
  • device 1 can be used, depending on requirements, for indoor lighting, but also for illuminating areas in the open, for street lighting for example.
  • Device 1 first of all comprises a plurality of LEDs 1Oa-IOe that, as better clarified in the following, are suitably disposed so as to obtain a satisfactory illumination in a predetermined area.
  • LEDs 1Oa-IOe are associated with an optical element 20 of a substantially planar extension; practically, the optical element 20 can have a plate-like structure, with square or rectangular plan conformation.
  • the optical element 20 is operatively associated with all LEDs 1Oa-IOe of device 1; in other words, the optical element 20 is employed for acting ⁇ on light beams generated by the different LEDs 1Oa-IOe and illuminating a predetermined area.
  • the optical element 20 has a substantially-flat first surface 21 facing LEDs 1Oa-IOe, and a second prism-like surface 22 opposite to the first surface 21.
  • the light beams generated by LEDs 1Oa-IOe initially strike on the first surface 21 and are submitted in cascade to the action of the second surface 22 before reaching the area to be illuminated.
  • prism-like surface it is intended any surface having one or more portions inclined to said first surface, so as to create refraction and/or reflection and/or diffraction and/or polarisation phenomena of light beams striking on the first surface 21.
  • the prism-like surface 22 portions consist of a succession of pairs of surfaces 22a inclined to the first surface 21, in which the inclined surfaces 22a. of the same pair converge away from the first surface 21; in more detail, the inclined surfaces 22a have the same longitudinal major extension direction, represented by X in Figs. " 3a-3b.
  • each pair of inclined converging surfaces 22a is included between 60° and 120°, preferably between 80° and 100°.
  • this angle can be of 90°.
  • the distance between the convergence line of the inclined surfaces 22a and the plane defined by the edges of -said " surfaces 22a opposite to the convergence ' lines is included between 1.5 mm and 3 mm and is of 2 mm, for example.
  • the distance between the first surface 21 and the plane defined by the edges of the surfaces 22a opposite to the convergence lines is included between 1.5 mm and 3 mm, and is of 2 mm, for example.
  • the prism-like surface has a zigzag course defined by said inclined surfaces 22a.
  • the second surface 22 is defined ' by a plurality of prismatic elements 22b disposed close to each other, each of which is defined by at least three side surfaces 22c inclined to the first surface 21 and converging, at a vertex 22d, away from the first surface 21.
  • the prism-like surface 22 can be defined by a plurality of right pyramids disposed close to each other and with a base parallel to the first surface 21.
  • the base of these pyramids can for instance have a square (as shown in Figs. 4a and 4b) or a hexagonal shape and preferably is in the form of a regular hexagon.
  • each pyramid is included between 1.5 mm and 2.5 mm, and is of 2 mm, for example.
  • the distance between the pyramid base and the first surface 21 of the optical element 20 is included between 1.5 mm and 3 mm, and is of 2 mm, for example .
  • the angle formed by each edge of said pyramid (not belonging to the pyramid base) ' with the base ' surface of said pyramid is included between -40° and 50°, and is preferably, of 45°.
  • the optical element 20 is at least partly transparent to the visible light, i.e. the light beams generated by LEDs 1Oa-IOe.
  • the optical element is advantageously made of fireproof material; it can be formed with polycarbonate, for example .
  • LEDs 1Oa-IOe are divided into groups lla-lle, and are such disposed that the main lighting directions Da-De of LEDs 1Oa-IOe belonging to the same group will form equal angles with the first surface 21 of the optical element 20, and the main lighting directions Da-De of LEDs 1Oa-IOe belonging to different groups will form different angles with the first surface 21 of the optical element 20.
  • LEDs belonging to group lib have main lighting directions Dd forming an angle ⁇ with the first surface 21 of the optical element 20, while the main lighting directions Dd of LEDs belonging to group Hd form a different angle ⁇ with the same first surface 21.
  • the different LEDs 1Oa-IOe can have ' different distance from the first surface 21; at all events, the distance between each LED and the first surface 21 can be included between 1 cm and 5 cm, and preferably between 2 cm and 4 cm.
  • a LED 10 typically generates a light beam F having the shape of a cone (diagrammatically shown in Fig. 7), the vertex V of which is defined by said LED 10 itself; the main lighting direction D is therefore the straight line along which the geometric height of this cone is measured.
  • the main lighting direction Da-De of different groups lla-lle converge away from said LEDs
  • the main lighting directions of any pair of LED groups converge on a point A (in the side view diagrammatically shown in Fig. 8 intersection between directions Db and De has been shown, by way of example) the orthogonal projection H of which on plane P in which the first surface 21 lies, falls inside the first surface 21 itself.
  • point A in Fig. 8 in a three-dimensional picture represents a straight line orthogonal to the plane of the sheet on which Fig. 8 is drawn; in this case, the orthogonal projection of this straight line on plane P in which . the first surface 21 lies, falls at least partly inside the first surface 21.itself.
  • the inclination of the main lighting directions Da-De relative to the first surface 21 of the optical element 20 decreases away from a substantially central portion 23 of said optical element 20, at least along a r ⁇ oving-away direction AL parallel to the first surface 21.
  • the central portion 23 of the optical element 20 can be defined as the portion facing a symmetry centre or symmetry axis of the arrangement of LEDs 1Oa-IOe; the central portion 23 can also be defined as the portion facing a symmetry axis or centre of a mounting surface 30 to be better described in the following and with which LEDs 1Oa-IOe are in engagement.
  • the central portion 23 of the optical element 20 can be a symmetry centre or axis of the optical element 20 itself.
  • the moving-away direction from this central portion can be defined by any straight line belonging to the first surface 21 of the optical element 20 and passing through this central portion 23 (or an orthogonal projection of said portion on the- first surface 21) .
  • each LED belonging to a predetermined group and having a main lighting direction that is not orthogonal to the first surface 21 has a main lighting direction differing by an angle ⁇ from the main lighting direction of the LEDs belonging to a group adjacent to said predetermined LED group; angle ⁇ is preferably included between 15° and 25° and equal to 20°, for example.
  • the distance between adjacent LED arrays can be included between 5 cm and 25 cm for example, and preferably between 6 cm and 10 cm.
  • adjacent LEDs can be separated by a distance included between 10 cm and 20 cm, preferably between 12 cm and 16 cm.
  • the moving-away direction from this central portion 23 can be defined by any straight line belonging to the first surface 21 or parallel . thereto and transverse to said symmetry axis
  • a symmetry axis of the arrangement of LEDs 1Oa-IOe that also appears to be the symmetry axis of the mounting surface 30 and the optical element 20.
  • each group lla-lle of LEDs 1Oa-IOe is mounted on a respective bearing surface 40a-40e.
  • LEDs 1Oa-IOe belonging to different groups are mounted on different bearing surfaces.
  • the inclination of the main lighting directions Da-De relative to the first surface 21 is determined.
  • Each bearing surface 40a-40e can have a plate-like structure having a substantially rectangular conformation, seen in plan view, or, more generally, an elongated shape (Figs. 1 and 5) .
  • LEDs 1Oa-IOe are preferably aligned along the major extension direction W of the respective bearing surface 40a-40e.
  • each bearing surface 40a-40e relative to the first surface 21 of the optical element 20 has an inclination different from the inclination of at least another bearing surface 4Oa-40e.
  • the inclination of the bearing surfaces 40a-40e increases on moving away from the substantially central portion 23 of the optical element 20, at least along one of the above defined moving-way directions.
  • each group lla-lle of LEDs 1Oa-IOe ' is defined by a respective LED array 15a-15e, i.e. a series of LEDs aligned along a preferably straight line.
  • the LED arrays 15a-15e are preferably parallel to each other.
  • device 1 comprises a first LED array 15a defining a respective group of LEDs 11a.
  • Each LED 10a of the first array 15a has a main lighting direction Da substantially orthogonal to the first surface 21 of the optical element 20.
  • the main lighting directions Da of LEDs 10a belonging to said first array 15a all lie in the same plane. More generally, the main lighting direction Da-
  • De of LEDs belonging to the same group lla-lle preferably lie in the same plane.
  • the LEDs 10a of the first array 15a are mounted on a respective first bearing surface 40a that is substantially parallel to the first surface 21 of the optical element 20.
  • the portion of optical element 20 facing the first LED array 15a can define said central portion 23 of the optical element 20 itself.
  • Device 1 further comprises a second and a third LED arrays 15b, 15c defining the second and third LED groups lib, lie, respectively.
  • the second and third LED arrays 15b, 15c are substantially parallel to the first LED array 15a and are disposed on opposite sides relative to the first LED array 15a.
  • the LEDs 10b of the second array 15B have main lighting directions D substantially symmetric to the main lighting directions D of the LEDs 10c of the third array 15c, relative to a predetermined plane Z.
  • This predetermined plane Z is a plane orthogonal to the first surface 21 of the optical element 20 and passing through the first LED array 15a.
  • Device 1 further comprises a fourth and a fifth array 15d, 15e of LEDs 1Od, 1Oe defining the fourth and fifth LED groups Hd, He, respectively.
  • the fourth and fifth arrays 15d, 15 are parallel to the first array 15a.
  • the fourth array 15d is in side by side relationship with the second array 15b and is positioned on the opposite side of the latter relative to the first array 15a.
  • the fifth array 15e is in side by side relationship with the third array 15c and is positioned on the opposite side of the latter relative to the first array 15a.
  • the inclinations of the main lighting directions Dd, De of the LEDs 1Od, 1Oe belonging to the fourth and fifth LED arrays 15d, 15e are symmetric to said predetermined plane Z .
  • the embodiment diagrammatically shown in Figs. 5 and 6 has a structure similar to that described with reference to the embodiment in Figs. 1 and 2; the difference consists in that in the embodiment in Figs. 5 and 6 device 1 further comprises an auxiliary LED array 15f parallel to the first LED array 15a and in side by side relationship therewith.
  • the LEDs 1Of of the auxiliary array 15f define a respective auxiliary LED group Hf.
  • the LEDs 1Of of the auxiliary array 15f have main lighting directions Df substantially orthogonal to the first surface 21 of the optical element 20.
  • the auxiliary LED array 15f is interposed between the first LED array 15a and the second LED array 15b.
  • the auxiliary LED array 15f can be interposed between the first and third LED arrays, 15a and 15c respectively.
  • the plane relative to which the main lighting directions Db, Dc of LEDs 10b, 10c of the second and third arrays 15b, 15c are symmetric is an auxiliary plane ZA orthogonal to the first surface 21 of the optical element 20 and spaced apart the same distance from the first LED array 15a and auxiliary LED array 15f .
  • the second and third LED arrays 15b, 15c are preferably mounted on a second and a third bearing surface 40b, 40c, respectively.
  • the second and third bearing surfaces 40b, 40c have inclinations, with respect to the first surface 21 of the optical element 20, that are , substantially symmetric, either relative to said plane Z orthogonal . to the first surface 21 and passing through the first LED array 15a, or relative to said auxiliary plane ZA.
  • LEDs 1Oa-IOe are such disposed that, on surfaces to be illuminated, the area illuminated by each LED at least partly overlaps the area illuminated by the_ ⁇ adjacent LED/LEDs.
  • the LEDs are disposed in such a manner that the line confining the area illuminated by one LED passes through the geometric centre of the area illuminated by one or more adjacent LEDs.
  • device 1 further comprises a mounting surface 30 on which LEDs 1Oa-IOe are mounted.
  • mounted on the mounting surface 30 are the bearing surfaces 40a-40e on which the LEDs of the different groups lla-lle are in turn mounted.
  • the mounting surface 30 is substantially parallel to the first surface 21 of the optical element 20.
  • the mounting surface 30 can be part of a box-shaped body 31 that, through engagement with the optical element 20, defines a closed space 32 in which LEDs 1Oa-IOe are contained.
  • the mounting surface 30 can be suitably designed for securing device 1 to the ceiling of a closed volume or room, for example, or to a suitable support structure.
  • device 1 further comprises an electric feeding unit 50 to supply LEDs 10 with the necessary electric power for correct operation.
  • the feeding unit 50 can be associated with a control circuit 60 for selectively powering • said LEDs 1Oa-IOe; in more detail, the control circuit 60 can allow one or more LED groups lla-lle that are to be energised to be selected, while the LEDs belonging to other groups are kept de-energised.
  • powering of LEDs 1Oa-IOe is current- controlled.
  • the different LED groups are powered in parallel, so that a possible failure or malfunction of a LED or LED group does not impair correct powering of the LEDs belonging to other groups.
  • the feeding unit 50 and/or control circuit 60 are mounted on said mounting surface 30.
  • the feeding unit 50 and/or control circuit 60 can be interposed between a pair of LED arrays, such as between the first array 15a and the auxiliary array 15f in the embodiment diagrammatically shown in Figs. 5 and 6.
  • feeding unit 50 and control circuit 60 are represented as blocks external to the box- ⁇ -shaped body 31 for the sake of clarity; actually, as described above, both the feeding unit 50 and control circuit 60 can be housed in said closed space 32.
  • control circuit 60 is drivable by a user through one or more switches or similar command means, to establish which of said LED groups are to be powered.
  • the invention achieves important advantages.
  • the device in accordance with the invention enables an acceptable illumination of areas of predetermined size to be achieved with reduced energy consumption.
  • a homogeneous and uniform illumination is obtained.
  • the invention also aims at providing a LED illuminating device having a simple .. and cheap structure with a reduced manufacturing complexity.

Landscapes

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

Abstract

La présente invention porte sur un dispositif d'éclairage à DEL comprenant une pluralité de DEL (10a-10e); un élément optique (20) s'étandant de manière sensiblement plane et comportant une première surface sensiblement plate (21) faisant face auxdites DEL (10a-10e); et une seconde surface de type prisme (22) opposée à la première surface (21), les DEL (10a-10e) étant divisées en groupes (11a-11e) et disposées de telle sorte que les principales directions d'éclairage (Da à De) des DEL appartenant au même groupe forment des angles égaux par rapport à la première surface (21) de l'élément optique (20) et que les directions principales d'éclairage (Da-De) des DEL appartenant à des groupes différents forment des angles différents par rapport à la première surface (21) de l'élément optique (20).
EP07827696A 2007-09-17 2007-09-17 Dispositif d'éclairage à del Withdrawn EP2191191A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IT2007/000644 WO2009037720A1 (fr) 2007-09-17 2007-09-17 Dispositif d'éclairage à del

Publications (1)

Publication Number Publication Date
EP2191191A1 true EP2191191A1 (fr) 2010-06-02

Family

ID=39256987

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07827696A Withdrawn EP2191191A1 (fr) 2007-09-17 2007-09-17 Dispositif d'éclairage à del

Country Status (3)

Country Link
EP (1) EP2191191A1 (fr)
CA (1) CA2699720A1 (fr)
WO (1) WO2009037720A1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITCR20090022A1 (it) * 2009-06-08 2010-12-09 Franco Venturini Plafoniera a led
ITPR20100003A1 (it) * 2010-01-14 2011-07-15 Nadlec S R L Dispositivo di illuminazione a led
CH705132A1 (de) * 2011-06-21 2012-12-31 Burri Public Elements Ag Lampengehäuse einer Strassenbeleuchtung.
EP2829787A1 (fr) * 2013-07-22 2015-01-28 Spagnolo S.r.L. Structure de lampe

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US20070064425A1 (en) * 2005-09-21 2007-03-22 Frecska Sandor A Adjustable LED luminaire

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DE19644126B4 (de) * 1996-10-23 2005-03-24 Klingsch, Wolfram, Prof. Dr.-Ing. Rettungsweg-Signalisierungssystem
TW408497B (en) * 1997-11-25 2000-10-11 Matsushita Electric Works Ltd LED illuminating apparatus
DE19818621A1 (de) * 1998-04-25 1999-10-28 Mannesmann Vdo Ag Schaltungsanordnung zur Einstellung der Helligkeit stromgesteuerter Leuchtdioden zur Beleuchtung einer Anzeige
AT409805B (de) * 1999-12-09 2002-11-25 Swarco Futurit Verkehrssignals Leuchtdioden-signalgeberoptik
FR2826098B1 (fr) * 2001-06-14 2003-12-26 Valeo Vision Dispositif d'eclairage ou de signalisation, notamment pour vehicule, comportant plusieurs sources lumineuses
DE10129743C2 (de) * 2001-06-20 2003-05-08 Daimler Chrysler Ag Fahrzeugscheinwerfer, mit einer Anzahl von elektronischen Leuchtelementen als Lichtquelle
DE102006004995A1 (de) * 2005-02-01 2006-10-19 Schott Ag Leuchte für zahnärztliche oder chirurgische Verwendung
US20060221613A1 (en) * 2005-04-05 2006-10-05 Coushaine Charles M Virtual point light source
JP2006331658A (ja) * 2005-05-23 2006-12-07 Dainippon Printing Co Ltd Ｌｅｄバックライト用光学部材

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US20070064425A1 (en) * 2005-09-21 2007-03-22 Frecska Sandor A Adjustable LED luminaire

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Also Published As

Publication number Publication date
WO2009037720A1 (fr) 2009-03-26
CA2699720A1 (fr) 2009-03-26

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