WO2013152201A1 - Source de lumière à matrice de del à rapport longueur/largeur supérieur à 1 - Google Patents

Source de lumière à matrice de del à rapport longueur/largeur supérieur à 1 Download PDF

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Publication number
WO2013152201A1
WO2013152201A1 PCT/US2013/035289 US2013035289W WO2013152201A1 WO 2013152201 A1 WO2013152201 A1 WO 2013152201A1 US 2013035289 W US2013035289 W US 2013035289W WO 2013152201 A1 WO2013152201 A1 WO 2013152201A1
Authority
WO
WIPO (PCT)
Prior art keywords
light source
led
led light
leds
populated area
Prior art date
Application number
PCT/US2013/035289
Other languages
English (en)
Inventor
Kurt S. Wilcox
Bernd Keller
Ted LOWES
Peter N. ANDREWS
Original Assignee
Cree, Inc.
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
Priority claimed from US13/441,558 external-priority patent/US9401103B2/en
Application filed by Cree, Inc. filed Critical Cree, Inc.
Priority to CN201380024946.5A priority Critical patent/CN104350327A/zh
Publication of WO2013152201A1 publication Critical patent/WO2013152201A1/fr

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
    • F21V5/04—Refractors for light sources of lens shape
    • 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
    • F21Y2101/00—Point-like 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
    • F21Y2105/00—Planar light sources
    • F21Y2105/10—Planar light sources comprising a two-dimensional 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
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

Definitions

  • This invention relates generally to the field of LED lighting fixtures and, more particularly, to the field of LED-based light sources for use in fixtures with specific light-distribution requirements.
  • LEDs light-emitting diodes
  • LED lighting fixtures 15 intensity discharge (HID) lamps are now being served by LED lighting fixtures.
  • Such lighting applications include, among a good many others, roadway lighting, factory lighting, parking lot lighting, and commercial building lighting.
  • fixtures for roadway lighting an application in which the fixtures are generally placed along roadway edges while light distribution is desired along a significant portion of roadway length and, of course, on the roadway itself - generally to the exclusion of significant light off the roadway. And in such situations it is desirable to minimize the use of large complex reflectors and/or varying orientations
  • the present invention is an LED light source which satisfies all of the above- noted objects and purposes.
  • the LED light source of this invention comprises a 30 submount including an LED-populated area which has an aspect ratio greater than 1, an array of LEDs on the LED-populated area, and a lens on the submount over the LED-populated area.
  • LED-populated area means an area ⁇ i.e., an area on the submount) the outer boundaries of which include the outermost edges of the
  • the term "aspect ratio” means the ratio of the maximum cross-dimension of the LED-populated area to the maximum of the cross-dimensions orthogonal thereto.
  • the spacing and 5 arrangement of the LEDs of the array are such that the total LED area is at least about one-third of the LED-populated area. In some embodiments, the spacing and arrangement of the LEDs of the array are such that the total LED area is at least about two-thirds of the LED-populated area, and in some of these embodiments, the spacing and arrangement of the LEDs of the array are such that the total LED area is about 10 90% of the LED-populated area.
  • total LED area means the sum of the submount areas immediately beneath each of the LEDs of the LED array.
  • the spacing between LEDs of the array is no more than about 1 millimeter (mm), and in some of these embodiments, the spacing 15 between LEDs is no more than about 0.5 mm, and sometimes no more than about 0.1 mm. And in certain other embodiments, the spacing is no more than about 0.075 mm, and even no more than about 0.05 mm.
  • the aspect ratio of the LED populated area is at least about 1.25. In some of these embodiments, the aspect ratio is at least 20 about 1.5, and in other embodiments, aspect ratio is at least about 2.
  • the LED-populated area in some embodiments is rectangular.
  • one such embodiment includes a rectangular array of LED' s including at least eight LEDs positioned in two rows of four LEDs in each row.
  • the array includes forty-eight LEDs positioned in four rows of twelve LEDs in each row.
  • the LED-populated area is asymmetric.
  • Asymmetric refers to an area the boundary of which is a geometric shape having no more than one axis around which there is bilateral symmetry. Therefore, it should be understood that LED-populated areas 30 which are rectangular are not asymmetric, given that they have two axes around which there is bilateral symmetry.
  • the LED light source is configured to refract LED-emitted light toward a preferential direction.
  • the LED array defines an
  • the lens has an outer surface and a centerline which is offset from the emitter axis toward the preferential direction.
  • the lens is shaped for refraction of LED-emitted light toward the preferential direction.
  • the lens may be asymmetric.
  • emitter axis means the line orthogonal to the plane defined by the LED-populated area and passing through the geometric center of the minimum-area rectangle bounding the LED-populated area, i.e., the center of the rectangle of minimum area which includes all of the LED-populated area.
  • asymmetric lens 10 unmodified by any further limiting description, refers to a lens shape which is not rotationally symmetric about any axis perpendicular to its base plane.
  • Types of asymmetric lenses include without limitation bilaterally symmetric lenses.
  • the LED-populated area has major and
  • the lens is overmolded on the submount.
  • the submount may comprise ceramic material, and may be aluminum
  • the submount has front and back sides, and the LED-populated area may be on the front side, with electrodes on the back side for connection purposes.
  • the light source of this invention may also be described as comprising (a) a submount including an LED-populated area with an array of light-emitting diodes (LEDs) thereon, the LED-populated area having first and second maximum cross-
  • FIGURE 1 is an enlarged perspective view of one embodiment of the LED light source according to the present invention and including an array of eight LEDs diodes and an asymmetric primary lens overmolded over the LED array.
  • FIGURE 2 is an enlarged perspective view of another embodiment of the LED light source according to the present invention and including an array of forty-eight LEDs and an asymmetric primary lens overmolded over the LED array.
  • FIGURE 3 is an enlarged plan view of an alternative LED array according to the present invention and having an asymmetric shape.
  • FIGURE 4 is an enlarged plan view of the LED array of the LED light source of FIGURE 1 and showing main dimensions of the LED array.
  • FIGURE 5 and 6 are enlarged plan views of yet more alternative LED arrays each configured according to the present invention.
  • FIGURE 7 is an enlarged plan view of another alternative LED array
  • FIGURE 8 is an enlarged perspective view of yet another embodiment of the LED light source according to the present invention and including a hemispheric primary lens overmolded over an LED array.
  • FIGURE 9 is an enlarged plan view of the LED light source of FIGURE 1.
  • FIGURE 10 is an enlarged front elevation of the LED light source of FIGURE
  • FIGURE 11 is an enlarged side elevation of the LED light source of FIGURE
  • FIGURE 12 is an enlarged front-side view of a submount of the LED light 25 source of FIGURE 1 showing the eight LEDs on the submount.
  • FIGURE 13 is a lateral-side view of the submount of FIGURE 12.
  • FIGURE 14 is a back-side view of the submount of FIGURE 12.
  • FIGURE 15 is an enlarged plan view of still another alternative configuration of an LED array according to the present invention.
  • FIGURE 15A is an exemplary illustration of outer boundaries of an LED- populated area of the LED array of FIGURE 15.
  • FIGURE 15B is an exemplary illustration of the location of an emitter axis of LED array of FIGURE 15, and is an exemplary illustration of two orthogonal
  • RU-247PCT -4 maximum cross-dimensions for the purpose of determination of an aspect ratio of an LED-populated area of FIGURE 15 A.
  • FIGURES 1-15 illustrate an LED light source 10 of this invention.
  • Light source 10 includes a submount 20 including an LED-populated area 11 which has an aspect ratio greater than 1, an array 12 of LEDs 13 on LED-populated area 11, and a lens 30 on submount 20 over LED-populated area 11.
  • FIGURE 15A illustrates an example of outer boundaries 111 of LED-
  • FIGURE 15B is an exemplary illustration of two orthogonal
  • FIGURES 1-8 also show that the spacing and arrangement of the LEDs 13 on each LED-populated area 11 is such that the total LED area is at least about one-third
  • the spacing and arrangement of the LEDs 13 are such that the total LED area is at least about two-thirds of the respective LED-populated areas 1 If and 1 lg. In FIGURES 1, 2, 4-6, the spacing and arrangement of the LEDs 13 are such that the total LED area is at least about 90% of LED-populated areas 11a, 1 lb, l id and l ie.
  • FIGURE 3 shows the spacing between LEDs 13 of array 1 lc is about 0.1 mm.
  • the spacing between LEDs 13 of array 1 la is about 0.075 mm.
  • the spacing between LEDs 13 of array 1 Id is about 0.05 mm.
  • FIGURES 1-8 and 15 illustrate various configurations of LED-populated areas 1 la-h with aspect ratios of at least about 1.25, at least about 1.5 and at least about 2.
  • FIGURES 1, 4 and 9 show LED light source 10a including rectangular LED- populated area 1 la with eight LEDs 13 arranged in two rows of four LEDs 13 in each row.
  • dimensions are indicated in millimeters in brackets, the first maximum cross dimension being [2.08], i.e., 2.08 millimeters, and indicated in inches under the brackets.
  • FIGURE 2 shows LED emitter 10b including forty-eight LEDs 13
  • the aspect ratios of LED- populated area 1 la is about 2 and aspect ratio of LED-populated area 1 lb is about 3.
  • FIGURES 3 and 7 illustrate LED arrays 11c and 1 If with LEDs 13 arranged in asymmetric configurations each having aspect ratio greater than 1.
  • FIGURES 1, 2 and 7-11 illustrate various versions of LED light source 10 configured to refract LED-emitted light toward a preferential direction 2.
  • Each LED array defines an emitter axis 14.
  • FIGURES 1, 2 and 7-11 illustrate lens 30 as configured to refract LED-emitted light toward preferential side 2.
  • FIGURES 1, 2 and 5 9-11 show a lens outer surface 31 shaped for refraction of LED-emitted light toward preferential side 2.
  • FIGURES 4, 7 and 9 show lens outer surface 31 having a centerline 32 offset from emitter axis 14 toward preferential side 2.
  • FIGURES 1, 2 and 9-11 show LED light source 10 which has both lens outer surface 31 having its centerline 32 offset from emitter axis 14 toward preferential side 2 and also being
  • lens 30 is shown as asymmetric.
  • FIGURE 4 illustrates that LED-populated area 1 la has a first cross-dimension 15 and a second cross-dimension 16 orthogonal to cross-dimension 15 where first cross-dimension 15 is greater than second cross-dimension 16.
  • Preferential direction
  • illumination pattern 15 2 is along minor cross-dimension 15, thereby to provide an illumination pattern which is offset toward preferential direction 2 with respect to emitter axis 14.
  • illumination patterns are asymmetric illumination patterns such as type III or type IV light distribution patterns used for roadway lighting, as established by The
  • FIGURE 15B is also an exemplary illustration of a position of emitter axis 14 passing through geometric center 14a of minimum-area rectangle 14b bounding LED- populated area 11.
  • FIGURES 1, 2 and 7-9 lens 30 is overmolded on submount 20.
  • FIGURES 12-14 show submount 20 comprising ceramic material 21. It is further seen in
  • submount 20 has a front side 22 and a back side 23 with LED- populated area 11 being on front side 22.
  • Light source 10 has electrodes 24 on back side 23 for electrical connection of LED light source 10.
  • FIGURE 12 best illustrates that submount 20 on its front side 22 includes three contact pads: positive contact pad 21 lp; intermediate contact pad 21 li; and negative
  • each such contact pad is deposited onto ceramic layer 21 by a metallization process.
  • the geometric configuration of the three contact pads 21 lp, 21 li and 21 In is such that LED array 12 can be conveniently laid out in a rectangular pattern shown in FIGURES 1 and 2. Numerous other patterns are possible as are
  • RU-247PCT -6 numerous other geometric configurations of the contact pads. Such other configurations and patterns are not limited by the embodiments shown.
  • FIGURE 13 best illustrates ceramic layer 21 on which contact pads 211 (21 lp, 21 li and 21 In) are deposited.
  • FIGURE 14 illustrates mounting pads 231 , 23 lp and 23 In also deposited onto ceramic layer 21 on back side 23 of submount 20 also by the metallization process.
  • Mounting pads 23 lp and 23 In are electrically-connected to contact pads 21 lp and 21 In, respectively, with vias 25 which pass through ceramic layer 21 with
  • Mounting pad 231 is electrically-isolated from mounting pads 23 lp and 23 In and serves for heat conduction from the LEDs 13.
  • the electrical isolation of mounting pad 231 may be done with a solder mask.
  • Contact pad metallization layers include a titanium layer, a copper layer and a
  • the silver layer may be the outmost layer on both front and back sides.
  • the copper layer is an intermediate layer between silver and titanium.
  • the titanium layer may be the innermost layer applied directly to ceramic 21. Approximate layer thicknesses may be as follows: aluminum ceramic layer 309 is or about 0.50 mm; titanium layer 315 is or about 0.06
  • copper layer 317 is or about 50 microns
  • silver layer 319 is or about 3.5 microns.
  • FIGURE 12 further illustrates LED array 12a with eight LEDs 13 with four LEDs 13p bonded onto positive contact pad 21 lp and four LEDs 13i bonded onto intermediate contact pad 21 li. LEDs 13 are bonded onto the corresponding contact
  • each LED 13 25 pads with the anode sides (p-type material) contacting the contact pads.
  • the opposite sides of each LED 13 are cathode sides (n-type material), and the cathode sides are wirebonded to other contact pads to complete the electrical circuit of LED light source 10. Gaps 28 between contact pads 211 provide electrical isolation therebetween.
  • FIGURE 12 also illustrates wirebonding connections 27 to each LED 13 as
  • RU-247PCT -7- intermediate contact pad 21 li are wirebonded to negative contact pad 21 In with two wirebond connections 27.
  • each of LEDs 13p is connected to a positive power terminal at contact pad 21 lp, such positive electrical connection being first made at mounting pad 23 lp and connected to contact pad 21 lp through vias 25. Electric current then flows through each LED 13p and through wirebond connections 27 to intermediate contact pad 21 li. The electric current continues to flow through each LED 13i which is bonded at its anode side to intermediate contact pad 21 li. Electric current then continues to flow through negative contact 21 li and then to negative mounting pad 23 In which is connected to negative contact pad 21 In through vias 25.
  • the connectivity of LED array 12a is four serial pairs of LEDs 13 wired in parallel to each other pair.
  • Positive contact 21 lp is connected to the positive terminal of a DC driver circuit (not shown) and negative contact pad 21 In is connected to the negative terminal of such driver circuit.
  • the double wirebond connection on each LED 13 provides electrical redundancy for each LED 13 to minimize total failure of any of LEDs 13, i.e. that if one wirebond fails the second wirebond would provide the necessary electrical connection.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Led Device Packages (AREA)

Abstract

L'invention concerne une source de lumière à DEL (10) utilisable dans des luminaires à DEL, la source de lumière à DEL comprenant une embase (20) comprenant une zone peuplée de DEL (11) qui a un rapport longueur/largeur supérieur à 1, une matrice de DEL (13) sur la zone peuplée de DEL, et une lentille (30) sur l'embase au-dessus de la zone peuplée de DEL. L'invention concerne aussi divers modes de réalisation facilitant l'éclairage latéral préférentiel, par exemple les usages sur les routes.
PCT/US2013/035289 2012-04-06 2013-04-04 Source de lumière à matrice de del à rapport longueur/largeur supérieur à 1 WO2013152201A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201380024946.5A CN104350327A (zh) 2012-04-06 2013-04-04 纵横比大于1的led阵列光源

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US13/441,558 2012-04-06
US13/441,558 US9401103B2 (en) 2011-02-04 2012-04-06 LED-array light source with aspect ratio greater than 1

Publications (1)

Publication Number Publication Date
WO2013152201A1 true WO2013152201A1 (fr) 2013-10-10

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PCT/US2013/035289 WO2013152201A1 (fr) 2012-04-06 2013-04-04 Source de lumière à matrice de del à rapport longueur/largeur supérieur à 1

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WO (1) WO2013152201A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106895303A (zh) * 2015-12-21 2017-06-27 立碁电子工业股份有限公司 产生特定横向矩形照明视窗的照明模块

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5125153A (en) * 1989-11-09 1992-06-30 Oerlikon-Contraves Ag Method of making a hybrid electronic array
US20090050907A1 (en) * 2005-01-10 2009-02-26 Cree, Inc. Solid state lighting component
US20090290360A1 (en) * 2008-05-23 2009-11-26 Ruud Lighting, Inc. Lens with tir for off-axial light distribution
US7733488B1 (en) * 2007-01-26 2010-06-08 Revolution Optics, Llc Compact multi-wavelength optical reader and method of acquiring optical data on clustered assay samples using differing-wavelength light sources
US20110204261A1 (en) * 2010-01-27 2011-08-25 FUSION UV SYSTEMS, INC. A Delaware Corporation Micro-channel-cooled high heat load light emitting device
US8092051B2 (en) * 2008-09-29 2012-01-10 Bridgelux, Inc. Efficient LED array
US20120307503A1 (en) * 2009-05-29 2012-12-06 Ruud Lighting, Inc. Multi-Lens LED-Array Optic System
US20130092960A1 (en) * 2007-10-31 2013-04-18 Ruud Lighting, Inc. Multi-Die LED Package

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5125153A (en) * 1989-11-09 1992-06-30 Oerlikon-Contraves Ag Method of making a hybrid electronic array
US20090050907A1 (en) * 2005-01-10 2009-02-26 Cree, Inc. Solid state lighting component
US7733488B1 (en) * 2007-01-26 2010-06-08 Revolution Optics, Llc Compact multi-wavelength optical reader and method of acquiring optical data on clustered assay samples using differing-wavelength light sources
US20130092960A1 (en) * 2007-10-31 2013-04-18 Ruud Lighting, Inc. Multi-Die LED Package
US20090290360A1 (en) * 2008-05-23 2009-11-26 Ruud Lighting, Inc. Lens with tir for off-axial light distribution
US8092051B2 (en) * 2008-09-29 2012-01-10 Bridgelux, Inc. Efficient LED array
US20120307503A1 (en) * 2009-05-29 2012-12-06 Ruud Lighting, Inc. Multi-Lens LED-Array Optic System
US20110204261A1 (en) * 2010-01-27 2011-08-25 FUSION UV SYSTEMS, INC. A Delaware Corporation Micro-channel-cooled high heat load light emitting device

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