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WO2018122059A1 - Dispositif d'éclairage comprenant une structure transparente - Google Patents

Dispositif d'éclairage comprenant une structure transparente Download PDF

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Publication number
WO2018122059A1
WO2018122059A1 PCT/EP2017/083758 EP2017083758W WO2018122059A1 WO 2018122059 A1 WO2018122059 A1 WO 2018122059A1 EP 2017083758 W EP2017083758 W EP 2017083758W WO 2018122059 A1 WO2018122059 A1 WO 2018122059A1
Authority
WO
WIPO (PCT)
Prior art keywords
lenslets
area
textured
led
disposed
Prior art date
Application number
PCT/EP2017/083758
Other languages
English (en)
Inventor
Rob Jacques Paul ENGELEN
Original Assignee
Lumileds Holding B.V.
Lumileds Llc
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 Lumileds Holding B.V., Lumileds Llc filed Critical Lumileds Holding B.V.
Priority to EP17818141.8A priority Critical patent/EP3563429B1/fr
Priority to JP2019534978A priority patent/JP7042830B2/ja
Priority to US16/474,911 priority patent/US10845026B2/en
Priority to CN201780081616.8A priority patent/CN110100321B/zh
Priority to KR1020197022286A priority patent/KR102498012B1/ko
Publication of WO2018122059A1 publication Critical patent/WO2018122059A1/fr
Priority to US17/074,693 priority patent/US11231159B2/en

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L25/00—Assemblies consisting of a plurality of semiconductor or other solid state devices
    • H01L25/03—Assemblies consisting of a plurality of semiconductor or other solid state devices all the devices being of a type provided for in a single subclass of subclasses H10B, H10D, H10F, H10H, H10K or H10N, e.g. assemblies of rectifier diodes
    • H01L25/04—Assemblies consisting of a plurality of semiconductor or other solid state devices all the devices being of a type provided for in a single subclass of subclasses H10B, H10D, H10F, H10H, H10K or H10N, e.g. assemblies of rectifier diodes the devices not having separate containers
    • H01L25/075—Assemblies consisting of a plurality of semiconductor or other solid state devices all the devices being of a type provided for in a single subclass of subclasses H10B, H10D, H10F, H10H, H10K or H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H10H20/00
    • H01L25/0753—Assemblies consisting of a plurality of semiconductor or other solid state devices all the devices being of a type provided for in a single subclass of subclasses H10B, H10D, H10F, H10H, H10K or H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H10H20/00 the devices being arranged next to each other
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V5/00—Refractors for light sources
    • F21V5/04—Refractors for light sources of lens shape
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
    • G02B19/0004—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed
    • G02B19/0009—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed having refractive surfaces only
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
    • H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
    • H10H20/80—Constructional details
    • H10H20/85—Packages
    • H10H20/855—Optical field-shaping means, e.g. lenses
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
    • H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
    • H10H20/80—Constructional details
    • H10H20/882—Scattering means

Definitions

  • LEDs light emitting diodes
  • RCLEDs resonant cavity light emitting diodes
  • VCSELs vertical cavity laser diodes
  • edge emitting lasers are among the most efficient light sources currently available.
  • Materials systems currently of interest in the manufacture of high-brightness light emitting devices capable of operation across the visible spectrum include Group III-V semiconductors, particularly binary, ternary, and quaternary alloys of gallium, aluminum, indium, and nitrogen, also referred to as Ill-nitride materials.
  • Ill-nitride light emitting devices are fabricated by epitaxially growing a stack of semiconductor layers of different compositions and dopant concentrations on a sapphire, silicon carbide, Ill-nitride, or other suitable substrate by metal-organic chemical vapor deposition (MOCVD), molecular beam epitaxy (MBE), or other epitaxial techniques.
  • MOCVD metal-organic chemical vapor deposition
  • MBE molecular beam epitaxy
  • the stack often includes one or more n-type layers doped with, for example, Si, formed over the substrate, one or more light emitting layers in an active region formed over the n-type layer or layers, and one or more p-type layers doped with, for example, Mg, formed over the active region. Electrical contacts are formed on the n- and p-type regions.
  • An LED emits light with a very wide angular range.
  • spot lamps such as an MR 16 -compatible bulb or a GUI 0-compatible bulb
  • a beam with a narrow angular spread is desired.
  • a total internal reflection (TIR) collimator positioned over the LED is a common solution to redirect the light from an LED into a tight beam.
  • TIR total internal reflection
  • Figs. 1 and 2 illustrate a prior art luminaire 15 having a TIR collimation optic 16 and an LED light emission device 18.
  • the structure of Figs. 1 and 2 is described in more detail in US 8038319.
  • the LED light emission device 18 includes an LED emitter array 20 mounted on printed wiring board (PWB) 22.
  • PWB printed wiring board
  • the LED emitter array 20 and PWB 22 cooperate to produce emitted light.
  • a phosphor conversion cavity 24 converts the emitted light to a phosphor-emitted light having a more desirable color rendering index (CRJ), for instance by changing the wavelength of the emitted light from blue to yellow to form mixed light with a white color.
  • CRJ color rendering index
  • the phosphor-emitted light next passes through a light extraction lens 26, which is typically made from cyclic olefin copolymer (COC) or glass.
  • the light extraction lens 26 increases the usable proportion of the phosphor-emitted light.
  • the light extracted by light extraction lens 26 passes through the interior polynomial surface 28 of the light coUimation device 30. Light passing through the interior polynomial surface 28 with a low elevation angle will reflect from the inner surface of outer TIR mirror 32.
  • the space 36 between the interior polynomial surface 28 and the outer TIR mirror 32 is filled with the solid optical polymer.
  • the outer TIR mirror 32 functions to produce collimated light.
  • a void 34 is provided in the light coUimation device 30 to reduce the sink (i.e., undesirable depressions) often experienced when violating uniform thickness rules for optical molding.
  • the collimated light passes through a lens 38 with wisp lenslet array 40 on the exit face of the TIR coUimation optic 16.
  • a top view of an exemplary exit face of the TIR coUimation optic 16 is illustrated in Fig. 3.
  • the wisp lenslet array 40 includes a plurality of wisp lenslets 42 forming an array of wisp lenslets formed on the surface 44. The quantity, placement and orientation of individual wisp lenslets might vary.
  • Fig. 1 is a side plan view illustration of a prior art luminaire.
  • Fig. 2 is a top plan view illustration of the luminaire of Fig. 1.
  • Fig. 3 is a cross sectional view of a transparent structure including a solid optic disposed over an LED.
  • Fig. 4 illustrates a collimating optic including multiple refractive lenses
  • FIG. 5 is a cross sectional view of a transparent structure including side
  • the too-narrow beam may be modified by adding texture to the top surface of the collimator lens, such as for example as illustrated in Fig. 2.
  • the lenslets are formed in a uniform array.
  • the light extraction lens 26 of Fig. 1 may produce a poorly collimated beam, while the TIR surface 32 may produce a well collimated beam.
  • the uniform array of lenslets illustrated in Fig. 2 when applied to each of these collimated beams, may create too much diffusion for the poorly collimated beam, and too little diffusion for the well collimated beam. As a result, the optical performance of such a lens may be limited.
  • the top, exit surface of a transparent structure such as a collimating optic includes a structure that causes diffusion or scattering of the light exiting the collimating structure. Different areas of the exit surface may be textured or patterned to cause different amounts of diffusion or scattering. For example, an area above a refracting lens may cause less scattering than an area above a TIR surface.
  • the exit surface is patterned with lenslets.
  • the optical power of the lenslets may vary as a function of position on the exit surface. For a spherical lenslet, the optical power may be estimated by the radius of curvature of the lenslet. For example, the optical power is determined by the "steepness" of the features. Lenslets with moderate gradients (near flat, larger radius of curvature) will have low optical power. Lenslets with steep gradients (taller, smaller radius of curvature) cause the light to bend more and such lenslets accordingly have stronger optical power.
  • the semiconductor light emitting devices are III- nitride LEDs that emit blue or UV light
  • semiconductor light emitting devices besides LEDs such as laser diodes and semiconductor light emitting devices made from other materials systems such as other III-V materials, Ill-phosphide, Ill-arsenide, II- VI materials, ZnO, or Si-based materials may be used.
  • Blue or UV emitting light emitting devices are often combined with one or more wavelength converting materials to add different colors of light, such that combined light from the light emitting device and the wavelength converting materials appears white.
  • Fig. 3 illustrates a transparent structure according to some embodiments.
  • the transparent structure 50 may be, for example, a collimating optic formed from a solid, transparent material such as PMMA, polycarbonate, silicone, glass, or any other suitable material.
  • a surface that forms convex, refractive lens 54 is located near the center of the structure 50.
  • One or more LEDs or other suitable light sources are disposed outside the structure 50 in a region 52 below the refractive lens 54. Extending upward from the bottom of region 52 are one or more curved, flat, or other surfaces 56 that cause total internal reflection.
  • the structure 50 illustrated in Fig. 3 may be rotationally symmetric, though this is not required.
  • the top surface 58 is textured to cause diffusion or scattering of the light exiting through the top surface.
  • the top surface 58 is patterned with lenslets 61.
  • the optical power of the lenslets 61 in area 60, above the refractive lens 54 may be small.
  • the optical power of the lenslets 61 in area 62, above the outer edge of the TIR surface far from the center of the lens may be large.
  • the top surface is textured (for example, with lenslets or any other suitable structure) to diffuse light over a first angular range, and in area 60, the top surface is textured to diffuse light over a second angular range that is broader/wider than the first angular range.
  • the shape of lenslets 61 may be considered hills separated by valleys, or hills separated by or surrounded by a fiat region of the top surface.
  • the height of the lenslets 61 i.e. the height of the hills
  • the distance between neighboring lenslets 61 i.e. between neighboring hills
  • the radius of curvature of lenslets 61 may be less than the radius of curvature of the lenslets in areas 60 requiring less optical power.
  • the entire surface 58 is covered by lenslets disposed in a hexagonal or near hexagonal array, or dimples disposed in a similar arrangement.
  • the spacing and arrangement of the lenslets on the surface 58 is consistent across the entire top surface 58, while the height of lenslets 61 differs in areas 62 and 60.
  • the spacing and arrangement of the lenslets varies across the top surface, for example between areas 62 and 60.
  • the coverage of the lenslets on the top surface 58 is often 100%, for optical reasons. In some embodiments, the lenslets occupy less than 100% of the top surface 58.
  • the height of lenslets 61 (i.e. the height of the hills or the height from hilltop to valley) in area 62 may be at least 20 ⁇ in some embodiments and no more than 1 mm in some embodiments, while the height of lenslets 61 in area 60 may be at least 0 ⁇ in some embodiments and no more than 0.8 ⁇ in some embodiments.
  • the height of the lenslets 61 in area 60 may be at least 0% in some embodiments and no more than 80% in some embodiments of the height of the lenslets 61 in area 62.
  • the pitch between adjacent lenslets is at least 50 ⁇ in some embodiments and no more than 2 mm in some embodiments.
  • the aspect ratio (AR) is defined as height difference between peak and valley of a lenslet divided by the distance between neighboring lenslets.
  • the AR in area 62 may be larger than the AR in area 60, in some embodiments.
  • the AR in area 62 may be at least 20% in some embodiments and no more than 100% in some embodiments.
  • the AR in area 60 may be at least 0% in some embodiments and no more than 50% in some embodiments.
  • the AR in area 60 may be at least 80% or less than the AR in area 62 in some embodiments.
  • the coverage of the surface 58 by lenslets 61 may be at least 50% in area 62 in some embodiments and at least 0% in area 60 in some embodiments.
  • the lenslets may be rotationally symmetric or non-rotationally symmetric, such as elliptical or any other shape.
  • the lenslets are arranged in a regular array and are substantially the same size and shape. However, between different areas of the exit surface, the arrangement and/or the size and shape of the lenslets varies. For example, within each of areas 60 and 62, the lenslets may be arranged in a regular array and may be substantially the same size and shape. However, the array, size, and/or shape of the lenslets in area 60 may differ from area 62.
  • the spacing, size, and/or shape may vary continuously.
  • a feature of the lenslets 61 such as the radius of curvature, the height, or any other feature, varies continuously over a portion of the top surface 58, including area 60, area 62, and a region between areas 60 and 62.
  • the different areas 60 and 62 of lenslets may be implemented on an exit surface that also includes areas that are smooth, substantially flat, and/or roughened (i.e., randomly textured).
  • Fig. 4 illustrates an optic 70 including four refractive lenses, arranged in a 2x2 array.
  • One LED or a group of LEDs may be disposed under each refractive lens.
  • Three regions 52A, 52B, and 52C, and three TIR surfaces 56A, 56B, and 56C are visible in the view of Fig. 4.
  • On the top surface 58 of the optic 70 four regions 60, 60A, 60B, and 60C which include texturing that produces less optical power, are surrounded by a region 62, which includes texturing that produces more optical power.
  • the top surface of the optic is textured, for example according to any of the examples or embodiments described above.
  • lenslets may be formed over the entire top surface of optic 70. In region 62, the lenslets are taller, have a smaller radius of curvature, and/or have greater optical power than the lenslets in regions 60, 60A, 60B, and 60C.
  • the transparent structure includes reflective sidewalls 70 disposed over a light source such as an LED 100.
  • the reflective sidewalls 70 may be, for example, formed from a reflective material such as a reflective metal, reflective plastic or resin, or any other suitable reflective material, or a reflective material such as reflective metal, reflective plastic, or reflective paint may be formed on a surface of, for example, a non-reflective structure such as plastic, metal, or any other suitable material.
  • the area 72 between the reflective sidewalls 70 may be filled with air, ambient gas, vacuum, a liquid material, a gel material, a solid material, or any other suitable material.
  • a transparent plate or other structure 74 is disposed over the reflective sidewalls 70 and area 72.
  • Transparent plate 74 may act as a cover and may be formed from any suitable material, including the materials for solid optics described in the above examples and
  • the top surface 76 is textured, for example according to any of the examples or embodiments described above.
  • a plurality of lenslets 61 are formed on the top surface 76 in the example illustrated in Fig. 5.
  • the optical power of the lenslets may differ in different areas of the top surface. In area 60 above LED 100, the lenslets may be smaller in height, may have less optical power, and may have a greater radius of curvature than the lenslets in area 62 above the reflective sidewalls 70.
  • the bottom surface 78 may be textured, for example as described above, instead of or in addition to the top surface 76.
  • the examples described above may be suitable for applications such as general illumination, backlighting, or any other suitable lighting application.
  • the examples described above may be integrated into any suitable light bulb, such as, for example, an Edison bulb, a multifaceted reflector (MR) bulb, a parabolic aluminized reflector (PAR) bulb, a bulged reflector (BR) bulb, a dimmable bulb, or any other suitable package.
  • MR multifaceted reflector
  • PAR parabolic aluminized reflector
  • BR bulged reflector
  • dimmable bulb or any other suitable package.

Landscapes

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

Abstract

Des modes de réalisation de l'invention comprennent une diode électroluminescente (DEL) et une structure transparente disposée sur la DEL. La structure transparente comprend une première surface qui réfléchit la lumière extraite de la DEL et incidente sur la première surface. La structure transparente comprend également une surface de sortie opposée à la première surface. La surface de sortie comprend une première zone qui est texturée pour diffuser la lumière sur une première plage angulaire et une seconde zone qui est texturée pour diffuser la lumière sur une seconde plage angulaire. La seconde plage angulaire est plus large que la première plage angulaire.
PCT/EP2017/083758 2016-12-29 2017-12-20 Dispositif d'éclairage comprenant une structure transparente WO2018122059A1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
EP17818141.8A EP3563429B1 (fr) 2016-12-29 2017-12-20 Dispositif d'éclairage comprenant une structure transparente
JP2019534978A JP7042830B2 (ja) 2016-12-29 2017-12-20 透明な構造体を含む照明装置
US16/474,911 US10845026B2 (en) 2016-12-29 2017-12-20 Lighting device including a transparent structure with groups of diffusing lenslets on an emission surface having a different aspect ratio
CN201780081616.8A CN110100321B (zh) 2016-12-29 2017-12-20 包括透明结构的照明器件
KR1020197022286A KR102498012B1 (ko) 2016-12-29 2017-12-20 투명 구조를 포함하는 조명 디바이스
US17/074,693 US11231159B2 (en) 2016-12-29 2020-10-20 Lighting device including a transparent structure

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US201662440317P 2016-12-29 2016-12-29
US62/440,317 2016-12-29
EP17154972 2017-02-07
EP17154972.8 2017-02-07

Related Child Applications (2)

Application Number Title Priority Date Filing Date
US16/474,911 A-371-Of-International US10845026B2 (en) 2016-12-29 2017-12-20 Lighting device including a transparent structure with groups of diffusing lenslets on an emission surface having a different aspect ratio
US17/074,693 Continuation US11231159B2 (en) 2016-12-29 2020-10-20 Lighting device including a transparent structure

Publications (1)

Publication Number Publication Date
WO2018122059A1 true WO2018122059A1 (fr) 2018-07-05

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ID=57995059

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PCT/EP2017/083758 WO2018122059A1 (fr) 2016-12-29 2017-12-20 Dispositif d'éclairage comprenant une structure transparente

Country Status (1)

Country Link
WO (1) WO2018122059A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10845026B2 (en) 2016-12-29 2020-11-24 Lumileds Llc Lighting device including a transparent structure with groups of diffusing lenslets on an emission surface having a different aspect ratio

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007049176A1 (fr) * 2005-10-25 2007-05-03 Koninklijke Philips Electronics N.V. Diodes electroluminescentes multiples a optiques secondaires differentes
EP2025995A2 (fr) * 2001-09-17 2009-02-18 Lumination, LLC Module de point lumineux à optique variable
EP2276076A1 (fr) * 2008-04-24 2011-01-19 Panasonic Electric Works Co., Ltd Unité luminescente dotée d une lentille
US8038319B2 (en) 2008-05-28 2011-10-18 Lighting Science Group Corporation Luminaire and method of operation
WO2012144325A1 (fr) * 2011-04-19 2012-10-26 コニカミノルタアドバンストレイヤー株式会社 Dispositif d'éclairage à del et lentille pour dispositif d'éclairage à del
DE202014003075U1 (de) * 2014-04-10 2014-04-22 Osram Gmbh Beleuchtungseinrichtung
WO2015185519A1 (fr) * 2014-06-02 2015-12-10 Koninklijke Philips N.V. Système optique pour collimation de lumière

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2025995A2 (fr) * 2001-09-17 2009-02-18 Lumination, LLC Module de point lumineux à optique variable
WO2007049176A1 (fr) * 2005-10-25 2007-05-03 Koninklijke Philips Electronics N.V. Diodes electroluminescentes multiples a optiques secondaires differentes
EP2276076A1 (fr) * 2008-04-24 2011-01-19 Panasonic Electric Works Co., Ltd Unité luminescente dotée d une lentille
US8038319B2 (en) 2008-05-28 2011-10-18 Lighting Science Group Corporation Luminaire and method of operation
WO2012144325A1 (fr) * 2011-04-19 2012-10-26 コニカミノルタアドバンストレイヤー株式会社 Dispositif d'éclairage à del et lentille pour dispositif d'éclairage à del
DE202014003075U1 (de) * 2014-04-10 2014-04-22 Osram Gmbh Beleuchtungseinrichtung
WO2015185519A1 (fr) * 2014-06-02 2015-12-10 Koninklijke Philips N.V. Système optique pour collimation de lumière

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10845026B2 (en) 2016-12-29 2020-11-24 Lumileds Llc Lighting device including a transparent structure with groups of diffusing lenslets on an emission surface having a different aspect ratio
US11231159B2 (en) 2016-12-29 2022-01-25 Lumileds Llc Lighting device including a transparent structure

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