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WO2012144325A1 - Dispositif d'éclairage à del et lentille pour dispositif d'éclairage à del - Google Patents

Dispositif d'éclairage à del et lentille pour dispositif d'éclairage à del Download PDF

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Publication number
WO2012144325A1
WO2012144325A1 PCT/JP2012/059316 JP2012059316W WO2012144325A1 WO 2012144325 A1 WO2012144325 A1 WO 2012144325A1 JP 2012059316 W JP2012059316 W JP 2012059316W WO 2012144325 A1 WO2012144325 A1 WO 2012144325A1
Authority
WO
WIPO (PCT)
Prior art keywords
led
lens
light
light source
lighting device
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.)
Ceased
Application number
PCT/JP2012/059316
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English (en)
Japanese (ja)
Inventor
小野雄樹
忍 菅
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.)
Konica Minolta Advanced Layers Inc
Original Assignee
Konica Minolta Advanced Layers 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
Application filed by Konica Minolta Advanced Layers Inc filed Critical Konica Minolta Advanced Layers Inc
Priority to JP2013510935A priority Critical patent/JPWO2012144325A1/ja
Publication of WO2012144325A1 publication Critical patent/WO2012144325A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/0006—Arrays
    • G02B3/0037—Arrays characterized by the distribution or form of lenses
    • G02B3/0056—Arrays characterized by the distribution or form of lenses arranged along two different directions in a plane, e.g. honeycomb arrangement of lenses
    • 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
    • F21V5/002—Refractors for light sources using microoptical elements for redirecting or diffusing light
    • F21V5/004—Refractors for light sources using microoptical elements for redirecting or diffusing light using microlenses
    • 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 an LED illumination device and a lens for the LED illumination device.
  • FIG. 15 of Patent Document 1 discloses a vehicle headlamp that is not an illumination device but can illuminate a narrow range by combining an LED chip and a microlens array. Therefore, it is conceivable to apply such a configuration to a lighting device.
  • Patent Document 2 discloses a technique for performing a light diffusion process on the entrance surface of a lens in order to alleviate color unevenness.
  • a yellow ring or an image of an LED chip is maintained with a narrow light distribution angle. No means for solving problems such as reflection are described.
  • the present invention has been made in view of such problems of the prior art, and in spite of the fact that the light distribution angle can be kept narrow, a yellow ring is generated in the emitted light or an image of the LED chip is reflected. It is an object of the present invention to provide a lens for an LED lighting device that can suppress the unevenness of illumination and further suppress uneven illuminance and an LED lighting device using the same.
  • the LED illumination device is provided with a plurality of LED light sources, an incident surface on which light emitted from the LED light sources is incident, and light incident from the incident surfaces.
  • the radius of curvature R of the microlens is large and the optical axis interval between the plurality of microlenses is wide, the light distribution angle can be kept narrow, but unevenness occurs in the periphery, and the yellow ring Further, it has been found that there is a problem that images of a plurality of LEDs are reflected. Therefore, by first satisfying the formulas (1) and (2), when a plurality of LED light sources are used, the light distribution angle is suppressed to be small. It is possible to suppress the occurrence or the reflection of the image of the LED chip, and to further suppress the illuminance unevenness. In addition, high efficiency can be maintained without significantly reducing light utilization efficiency.
  • the LED lighting device according to claim 2 is characterized in that, in the invention according to claim 1, the following expression is satisfied. 1.0 ⁇ R / D ⁇ 2.1 (4) However, D: Distance between optical axes of adjacent microlenses (mm)
  • the LED illumination device according to claim 3 is characterized in that, in the invention according to claim 1 or 2, the adjacent microlenses are connected by a curved surface having a radius r (mm).
  • the LED lighting device according to claim 4 is characterized in that, in the invention according to claim 3, the following expression is satisfied.
  • the crossing portion is close to the edge, so that the suppression effect such as scattering may be reduced.
  • the value exceeds the upper limit of the expression (5) the optical surface of the microlens becomes small, and there is a possibility that light rays emitted along the desired light distribution characteristics may be reduced. Therefore, it is preferable to satisfy the range of the formula (5).
  • the strength of the lens itself can be increased by suppressing the edge between the microlenses.
  • the LED illumination device is characterized in that, in the invention according to any one of claims 1 to 4, an outer shape of the microlens is a honeycomb shape.
  • an outer shape of the microlens is a honeycomb shape.
  • the LED illumination device is characterized in that, in the invention according to any one of claims 1 to 5, a light distribution angle of light emitted from the lens is 30 degrees or less.
  • a light distribution angle of light emitted from the lens is 30 degrees or less.
  • the LED illuminating device suitable for the illumination for downlights can be provided.
  • the yellow ring and the LEDs of a plurality of LEDs can be used even in a narrow light distribution angle of 30 degrees or less, which is likely to cause a problem of yellow ring and reflection of images of the LEDs. Since there is no reflection of an image, the effect of the present invention is particularly remarkable.
  • the LED illumination device lens according to claim 7 is used for the LED illumination device according to any one of claims 1 to 6.
  • the LED (Light Emitting Diode) illumination device has an LED light source and a lens.
  • LED light sources can be used, white LEDs are preferably used.
  • the white LED a combination of a blue LED chip and a phosphor such as a YAG phosphor that emits yellow light by blue light emitted from the blue LED chip is preferably used, but a blue LED chip, a green LED chip, and a red LED are used. It may be a white LED that forms white light in combination with a chip.
  • a white LED for example, one described in Japanese Patent Application Laid-Open No. 2008-231218 can be used, but is not limited thereto.
  • the white LED light source in the present invention is specifically composed of an LED chip and a phosphor layer formed on the LED chip so as to cover the LED chip.
  • the LED chip emits light having a first predetermined wavelength. In the present embodiment, the LED chip emits blue light.
  • the wavelength of the LED chip of the present invention and the wavelength of the emitted light from the phosphor are not limited, and the wavelength of the emitted light from the LED chip and the wavelength of the emitted light from the phosphor are in a complementary color relationship and the synthesized light is white. Any combination that provides light can be used.
  • an LED chip a known blue LED chip can be used.
  • the blue LED chip any existing one including InxGa1-xN can be used.
  • the emission peak wavelength of the blue LED chip is preferably 440 to 480 nm.
  • the LED chip is mounted on the substrate and directly radiated upward or sideward, or the blue LED chip is mounted on a transparent substrate such as a sapphire substrate, and bumps are formed on the surface thereof. Any form of LED chip, such as a so-called flip chip connection type, in which it is formed and turned over and connected to an electrode on a substrate, can be applied.
  • the phosphor layer has a phosphor that converts light having a first predetermined wavelength emitted from the LED chip into a second predetermined wavelength. In an embodiment described later, blue light emitted from the LED chip is converted into yellow light.
  • the phosphor used for such a phosphor layer uses an oxide or a compound that easily becomes an oxide at a high temperature as a raw material of Y, Gd, Ce, Sm, Al, La and Ga, and converts them into a stoichiometric amount.
  • the raw material is obtained by thoroughly mixing in a theoretical ratio.
  • a coprecipitated oxide obtained by calcining a solution obtained by coprecipitation of oxalic acid with a solution obtained by dissolving a rare earth element of Y, Gd, Ce, and Sm in an acid at a stoichiometric ratio, and aluminum oxide and gallium oxide. Mix to obtain a mixed raw material.
  • the compact can be packed in a crucible and fired in air at a temperature range of 1350 to 1450 ° C. for 2 to 5 hours to obtain a sintered body having the phosphor emission characteristics.
  • each of the plurality of LED chips may be arranged symmetrically with respect to the optical axis of the lens or may be arranged asymmetrically.
  • the diameter of the smallest circle C1 circumscribing the LED chip CP and as shown in FIG.
  • the larger one of the diameters of the yellow phosphor YEL when the yellow phosphor YEL is circular is defined as the diameter ⁇ 1 of the LED light source.
  • the diameter of the smallest circumscribed circle is the diameter ⁇ 1 of the LED light source.
  • the LED light source is preferably a high-power LED light source.
  • the high-power LED light source can be constituted by an LED having an output of 0.5 watts or more.
  • the lens is disposed on the light emission side of the LED light source, the incident surface on which the emitted light from the LED light source is incident, the reflective surface that reflects the light incident from the incident surface, and the emitted light from the LED light source to the outside It has an exit surface that emits light. Further, the incident surface of the lens and the LED light source are not in contact with each other. The space between the lens incident surface and the LED light source is preferably filled with air.
  • the incident surface of the lens is preferably a lens surface having a positive refractive power, but may be a flat surface.
  • the lens shape of the entrance surface of the lens is a convex shape. Furthermore, the shape of the incident surface may be an aspherical shape.
  • the exit surface of the lens consists of an inner region where a lens array in which a plurality of microlenses are arranged and an outer region consisting of a flat surface.
  • the reflecting surface of the lens is preferably disposed between the entrance surface and the exit surface, and has a shape that reflects the light incident from the entrance surface and emits it from the exit surface, for example, using total reflection.
  • a reflective film or the like may be formed on the reflective surface.
  • the lens is supported by the leg and may have a recess.
  • the concave portion preferably has an incident surface and a side incident surface, which are preferably smooth surfaces, but may be subjected to light diffusion treatment.
  • the incident surface is formed to face the LED light source with respect to the optical axis direction of the lens
  • the side surface incident surface is formed to face the LED light source with respect to the direction perpendicular to the optical axis of the lens. ing.
  • the incident surface and the side incident surface are not in contact with the LED light source.
  • the LED light source is enclosed by the recessed part, and, thereby, the light radiate
  • the lens may have a shape for positioning on the wiring board.
  • a shape for positioning the shape which provided the recessed part in the lens as mentioned above, and the shape which provided the convex part are mentioned.
  • a surface may be formed on a partial surface of the concave portion of the lens so that a part of the light incident on the lens is totally reflected to guide the light to the front end side of the lens.
  • the lens is preferably made of plastic.
  • plastic for example, polycarbonate or acrylic can be used as the plastic constituting the lens.
  • polycarbonate or acrylic By using polycarbonate or acrylic, it can be manufactured by injection molding, and the manufacturing cost can be greatly reduced.
  • a reflector may be disposed between the LED light source and the lens.
  • the reflector reflects light emitted from the LED light source, and the reflector preferably has a reflecting surface.
  • the angle with respect to the optical axis that is half the light intensity on the optical axis of the lens is called a half-value half-angle, and twice that angle. Is called full width at half maximum.
  • the light distribution angle means a full width at half maximum.
  • lighting fixtures equipped with LED lighting devices it is suitable for indoor and outdoor use, especially for downlights, but for other uses, general lighting fixtures (laser pointers, indicators, etc.), residential use Lighting fixtures, office lighting fixtures, store / exhibit lighting fixtures, street lamp lighting fixtures, guide lamp fixtures and signaling devices, advertising towers, lighting poles, underwater lighting lights, strobe lights, spotlights, flashlights , Electronic bulletin boards (sign boards), dimmers, automatic flashers, backlights for displays, moving picture devices, illuminated switches, optical sensors, medical lights, in-vehicle lights, and the like.
  • general lighting fixtures laser pointers, indicators, etc.
  • residential use Lighting fixtures office lighting fixtures, store / exhibit lighting fixtures, street lamp lighting fixtures, guide lamp fixtures and signaling devices, advertising towers, lighting poles, underwater lighting lights, strobe lights, spotlights, flashlights , Electronic bulletin boards (sign boards), dimmers, automatic flashers, backlights for displays, moving picture devices, illuminated switches, optical sensors, medical lights, in-vehicle lights,
  • the present invention despite the fact that the light distribution angle can be kept narrow, it is possible to suppress the occurrence of yellow ring in the emitted light or the image of the LED chip being reflected, and further to suppress illuminance unevenness, It is possible to provide a lens for a bright LED lighting device that can maintain high light utilization efficiency and an LED lighting device using the same.
  • FIG. 2 is a view of the LED illumination device according to the present embodiment as viewed from the exit surface side.
  • FIG. 3 is a view of the configuration of FIG. 2 taken along line III-III and viewed in the direction of the arrow.
  • FIG. 4 is an enlarged cross-sectional view of the microlens.
  • the LED lighting device according to the present embodiment includes a lens 1 and an LED light source 2.
  • the circuit board CB includes a substrate main body BS made of aluminum, an insulating layer IL stacked on the substrate main body BS, and a wiring pattern HP made of a conductor such as Cu formed on the insulating layer IL. It is roughly composed of A plurality of LED chips CP are connected in parallel to the wiring pattern HP.
  • the LED chip CP is completely covered with a plate-shaped molded phosphor-containing transparent resin body YEL (phosphor-containing transparent resin), and all the light emitted from the LED chip CP is phosphor-containing transparent. It is configured to pass through the resin body YEL.
  • a blue light emitting diode is used as the LED chip CP
  • a yellow phosphor is used as the phosphor contained in the phosphor-containing transparent resin, whereby white light can be emitted.
  • the plurality of LED chips CP are arranged as shown in FIG. 1A, for example, and constitute the LED light source 2 as described above.
  • the diameter of the LED light source 2 is ⁇ 1 (mm).
  • the lens 1 uses polycarbonate or acrylic as plastic. Further, the lens 1 is disposed on the light emission side of the LED light source 2 and has an incident surface 3 on which emitted light from the LED light source 2 is incident and a parabolic surface that reflects part of the light incident from the incident surface. Reflection surface 8 and an emission surface 5 for emitting emitted light to the outside.
  • the emission surface 5 includes a circular inner region 5a in which a lens array LA in which a plurality of microlenses MS are arranged is formed, and an annular outer region 5b having a flat surface.
  • the diameter of the inner region is ⁇ 3 (mm), and the diameter of the emission surface 5 is ⁇ 2 (mm). At this time, the following expression is satisfied. 3 ⁇ ⁇ 2 / ⁇ 1 ⁇ 5 (1) 0.6 ⁇ ⁇ 3 / ⁇ 2 ⁇ 0.9 (2)
  • adjacent microlenses MS are in contact with each other, and the outer shape thereof is a hexagonal shape.
  • FIG. 4 is an enlarged view showing a cross section of the lens array.
  • the microlenses MS have the same radius of curvature R (mm).
  • the distance between the optical axes of adjacent microlenses MS is D (mm).
  • the following expression is satisfied. 1.0 (mm) ⁇ R ⁇ 2.0 (mm) (3) 1 ⁇ 0 ⁇ R / D ⁇ 2.1 (4)
  • the lens 1 has a leg portion 7 having a recess 6 therein, and the recess 6 has an incident surface 3 and a side incident surface 4.
  • the incident surface 3, the side surface incident surface 4, and the LED light source 2 are not in contact with each other, and the periphery of the LED light source 2 is surrounded by the side surface incident surface 4.
  • the light emitted from the LED light source 2 is incident from the side incident surface 4 or the incident surface 3. Further, the light incident from the incident surface 3 is refracted and collected by the convex incident surface 3 and travels toward the output surface 5, and the light incident from the side surface incident surface 4 is reflected by the reflecting surface 8. Heading to the exit surface 5. After that, a part of the light is appropriately scattered by the lens array LA in the inner region 5a of the convex emission surface 5 and emitted to the outside, thereby suppressing the yellow ring and clearly displaying the image of the LED chip. In addition, illuminance unevenness is further suppressed.
  • the remaining light passes through the outer region 5b, is controlled to have a light distribution angle as narrow as within 30 degrees, and is emitted to the outside of the lens 1.
  • FIG. 5 is an enlarged view showing a processing state of a mold for molding a lens according to another embodiment.
  • the tool GT has a polished surface TP formed of a part of a spherical surface with a radius R that is rotationally symmetric with respect to the rotation axis X on the lower surface. While the tool GT is rotated about the rotation axis X, the polishing surface TP is brought close to the mold material M, and one molding surface RP that is a spherical surface having a radius R is formed. Thereafter, the tool T is moved in the direction intersecting the rotation axis X by a pitch D together with a drive source (not shown), and the adjacent forming surface RP is similarly processed and formed.
  • the boundary portion BD is stroked on the polishing surface TP so that the boundary portion BD of the molding surface RP becomes a curved surface having a radius r (moved in an arc shape as indicated by an arrow in the plane of FIG. 5). Then, the tool GT and a drive source (not shown) are moved. By repeating the above, a plurality of molding surfaces RP can be molded.
  • FIG. 6 is an enlarged cross-sectional view of a lens molded by the mold thus formed.
  • the microlens MS is transferred and formed by the molding surface RP of the mold, and the curved connecting surface is formed between the microlenses MS by the boundary portion BD.
  • CT is transferred and formed.
  • adjacent microlenses MS are connected to each other by a curved connecting surface CT having a radius r (mm), so that when such a lens is used for an LED illumination device, scattering of emitted light and the like are performed. It is possible to suppress illuminance and light utilization efficiency. Further, by eliminating the edge between the microlenses MS, the stress concentration can be relaxed and the strength of the lens itself can be increased. According to the examination results of the present inventors, it has been found that the strength is improved by about 6% with respect to a lens having an edge between the microlenses MS.
  • FIG. 7 is an enlarged view showing a processing state of a mold for molding a lens according to still another embodiment.
  • the tool GT approaches the mold material M perpendicularly, is processed by a predetermined amount, is separated, and is further moved at a constant pitch in a direction perpendicular to the rotation axis.
  • the molding surface RP arranged in a honeycomb shape is formed by making it approach perpendicularly again with respect to the material M of the mold again, similarly processing a predetermined amount, and then separating it.
  • the space between the adjacent molding surfaces RP remains as an edge.
  • the cutting tool BT is moved closer to the predetermined amount and further moved in the radial direction to cut the edge between the molding surfaces RP, and the flat boundary.
  • the surface BD can be formed.
  • FIG. 8 is an enlarged cross-sectional view of a lens molded by the mold thus formed.
  • the microlens MS is transferred and formed by the molding surface RP of the mold, and the planar connecting surface is formed between the microlenses MS by the boundary surface BD.
  • CT is transferred and formed. Thereby, scattering of emitted light and the like can be suppressed.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Led Device Packages (AREA)

Abstract

L'invention concerne une lentille pour un dispositif d'éclairage à DEL permettant de supprimer l'apparition d'un anneau jaune dans la lumière émise et la projection de l'image de la puce de DEL même si l'angle de répartition lumineuse peut être maintenu étroit et permettant en outre de supprimer les variations de luminosité, et un dispositif d'éclairage à DEL utilisant celui-ci. Une surface de sortie (5) d'une lentille (1) est formée à partir d'une région intérieure (5a), dans laquelle un ensemble de lentilles (LA) comprenant une pluralité de microlentilles (MS) est agencé, et d'une région extérieure (5b) formée à partir d'une surface plane et satisfait les équations suivantes : 3 ≤ ø2/ø1 ≤ 5 (1) ; 0,6 ≤ ø3/ø2 ≤ 0,9 (2) ; 1,0 (mm) ≤ R ≤ 2,0 (mm) (3) ; dans lesquelles : ø1 : diamètre (mm) de la source lumineuse à DEL ; ø2 : diamètre (mm) de la surface de sortie ; ø3 : diamètre (mm) d'une région intérieure ; R : rayon (mm) de courbure de microlentille.
PCT/JP2012/059316 2011-04-19 2012-04-05 Dispositif d'éclairage à del et lentille pour dispositif d'éclairage à del Ceased WO2012144325A1 (fr)

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Application Number Priority Date Filing Date Title
JP2013510935A JPWO2012144325A1 (ja) 2011-04-19 2012-04-05 Ｌｅｄ照明装置及びｌｅｄ照明装置用レンズ

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2011092689 2011-04-19
JP2011-092689 2011-04-19
JP2011183298 2011-08-25
JP2011-183298 2011-08-25

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US20150043192A1 (en) * 2013-08-09 2015-02-12 Omron Corporation Switch and keyboard provided therewith
CN105190396A (zh) * 2012-12-12 2015-12-23 莱迪奥股份公司 光学表面、透镜、反射器、光学装置以及照明器
JP2016152398A (ja) * 2015-02-19 2016-08-22 株式会社エルム 発光装置およびそれに用いられる蛍光体層の作成方法
JP2016171069A (ja) * 2015-03-12 2016-09-23 浚洸光學科技股▲ふん▼有限公司 発光システム
JP2016207370A (ja) * 2015-04-20 2016-12-08 アイリスオーヤマ株式会社 Ｌｅｄ照明装置
KR101698721B1 (ko) * 2016-05-25 2017-01-20 한국광기술원 Led 조명 어셈블리 및 이를 이용한 led 조명장치
EP3121626A1 (fr) * 2015-07-23 2017-01-25 Lieh-Hsiung Hu Lentille de réfraction et structure de plate-forme comprenant de multiples lentilles de réfraction s'étendant à travers celle-ci
TWI574048B (zh) * 2012-12-24 2017-03-11 鴻海精密工業股份有限公司 光學透鏡及使用該光學透鏡的背光模組
KR20170077399A (ko) * 2015-12-28 2017-07-06 에스엘 주식회사 차량용 램프
CN106969311A (zh) * 2015-11-20 2017-07-21 Sl株式会社 车辆用灯具
WO2018122059A1 (fr) * 2016-12-29 2018-07-05 Lumileds Holding B.V. Dispositif d'éclairage comprenant une structure transparente
US10247392B2 (en) 2015-06-30 2019-04-02 Chun Kuang Optics Corp. Luminous system
JP2020068206A (ja) * 2018-10-24 2020-04-30 シャープ株式会社 レーザー照明装置
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
EP3832198A1 (fr) * 2019-12-05 2021-06-09 BJB GmbH & Co. KG Couverture à effet optique pour une source lumineuse
WO2021158189A1 (fr) * 2020-10-30 2021-08-12 Oyak Renault Otomobi̇l Fabri̇kalari Anoni̇m Şi̇rketi̇ Système d'éclairage en courbe et en virage
JP2021141036A (ja) * 2020-03-02 2021-09-16 韓一電機株式会社 照明ランプアセンブリ

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JP2009063684A (ja) * 2007-09-05 2009-03-26 Hitachi Ltd 映像表示装置
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