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WO2008138231A1 - Lampe à del à dissipation de chaleur hautement efficace - Google Patents

Lampe à del à dissipation de chaleur hautement efficace Download PDF

Info

Publication number
WO2008138231A1
WO2008138231A1 PCT/CN2008/000957 CN2008000957W WO2008138231A1 WO 2008138231 A1 WO2008138231 A1 WO 2008138231A1 CN 2008000957 W CN2008000957 W CN 2008000957W WO 2008138231 A1 WO2008138231 A1 WO 2008138231A1
Authority
WO
WIPO (PCT)
Prior art keywords
led
heat
light source
cavity
led light
Prior art date
Application number
PCT/CN2008/000957
Other languages
English (en)
Chinese (zh)
Inventor
Jie She
Original Assignee
Jie She
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 Jie She filed Critical Jie She
Publication of WO2008138231A1 publication Critical patent/WO2008138231A1/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
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • F21V29/74—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades
    • F21V29/76—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical parallel planar fins or blades, e.g. with comb-like cross-section
    • F21V29/763—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical parallel planar fins or blades, e.g. with comb-like cross-section the planes containing the fins or blades having the direction of the light emitting axis
    • 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
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • 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
    • F21K9/20—Light sources comprising attachment means
    • F21K9/23—Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings
    • F21K9/233—Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings specially adapted for generating a spot light distribution, e.g. for substitution of reflector lamps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S8/00—Lighting devices intended for fixed installation
    • F21S8/02—Lighting devices intended for fixed installation of recess-mounted type, e.g. downlighters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S8/00—Lighting devices intended for fixed installation
    • F21S8/04—Lighting devices intended for fixed installation intended only for mounting on a ceiling or the like overhead structures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S8/00—Lighting devices intended for fixed installation
    • F21S8/04—Lighting devices intended for fixed installation intended only for mounting on a ceiling or the like overhead structures
    • F21S8/06—Lighting devices intended for fixed installation intended only for mounting on a ceiling or the like overhead structures by suspension
    • 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
    • F21W2131/40—Lighting for industrial, commercial, recreational or military use
    • F21W2131/406—Lighting for industrial, commercial, recreational or military use for theatres, stages or film studios
    • 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
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/0001—Technical content checked by a classifier
    • H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00

Definitions

  • the utility model relates to a high-power LED lamp, in particular to an array type high-power LED lamp with high heat dissipation. Background technique
  • LEDs have the advantages of low energy consumption, low heat generation and long service life, which can be used to replace traditional light sources. Considering that the luminance of a single LED is insufficient, LED lamps generally use a plurality of LEDs arranged in an array, thereby causing a problem that heat dissipation of high-power LED lamps is difficult.
  • the purpose of the utility model is to overcome the deficiencies of the prior art, and to provide an LED lamp with high heat dissipation, which has better heat dissipation effect, low energy consumption, long service life and small attenuation of light energy.
  • An LED lamp with high efficiency heat dissipation comprising an electrical cavity cover, a PCB circuit board, a PCB mounting plate, an open heat sink, at least one LED light source component unit and a light transmissive cover plate; each LED light source component unit comprises a single LED light source, Lens and two #_ conductive leads;
  • the electrical cavity cover and the PCB mounting plate are connected to each other to form a sealed electrical cavity I; the PCB circuit board is disposed in the electrical cavity I;
  • the open heat dissipating body includes a heat dissipating plate, and one side of the heat dissipating plate is provided with a plurality of heat conducting ribs, and an upper portion of the heat conducting rib and the PCB mounting plate are connected to each other to form an open heat dissipating cavity II;
  • the transparent cover plate and the heat dissipation plate of the open heat sink are connected to each other to form a closed LED illumination cavity III; the at least one LED light source is disposed in the LED illumination cavity III;
  • the other side of the heat dissipation plate opposite to the heat conducting rib is provided with a plurality of LED wire perforations, and each LED light source corresponds to two LED wire perforations;
  • the plurality of heat conducting ribs includes a plurality of hollow wire struts, each of the hollow wire struts for accommodating only one conductive lead of the LED light source assembly unit, each of the hollow wire struts directly communicating with the outside air Contacting; having a plurality of wire perforations corresponding to the LED wire perforations on the PCB mounting plate, each of the conductive leads of each of the LED light source assembly units passing through a hollow wire on a heat dissipation plate of the open heat sink
  • the struts, and through the wire perforations on the PCB mounting board, are connected to the PCB circuit board to make electrical connections to the corresponding electronic components.
  • An efficient heat dissipation LED lamp comprising an electrical cavity cover, a PCB circuit board, an open heat sink, at least one LED light source component unit and a light transmissive cover plate; each LED light source component unit comprises a single LED light source, a lens and two Conductive lead
  • the electrical cavity cover and the PCB circuit board are connected to each other to form a sealed electrical cavity I; and a circuit is directly printed on the PCB circuit board inside the electrical cavity I;
  • the open heat sink includes a heat dissipation plate, and one side of the heat dissipation plate is provided with a plurality of heat conduction ribs, and an upper portion of the heat conduction rib and another side of the PCB circuit board are connected to each other to form an open heat dissipation cavity.
  • the light-transmissive cover plate and the heat-dissipating plate of the open heat-dissipating body are connected to each other to form a sealed LED illumination cavity III; the at least one LED light source is disposed in the LED illumination cavity III;
  • the other side of the heat dissipation plate opposite to the heat conducting rib is provided with a plurality of LED wire perforations, and each LED light source corresponds to two LED wire perforations;
  • the plurality of heat conducting ribs includes a plurality of hollow wire struts, each hollow wire struts for accommodating only one conductive lead of the LED light source assembly unit, each hollow wire strut directly contacting the outside Air contact; on the PCB circuit board, there are a plurality of wire perforations corresponding to the LED wire perforations, and each of the conductive leads of each of the LED light source component units passes through a hollow plate on the heat dissipation plate of the open heat sink
  • the wire struts are pierced through the wires on the PCB circuit board and connected to the PCB circuit board to make electrical connections to the corresponding electronic components.
  • the high-efficiency heat-dissipating LED lamp of the utility model adopts a three-chamber structure, and the structure thereof is reasonable and compact, the manufacturing is easy, and the heat dissipation effect is good.
  • the present invention has the following advantages: (1) Efficient heat dissipation: transferring heat generated by the LED light source into the open heat sink; a plurality of heat conductive ribs are disposed on one side of the heat sink of the open heat sink, and the plurality of heat conductive ribs include a plurality of hollow Wire struts, each of the hollow wire struts is for accommodating only one conductive lead of the LED light source assembly unit, and each hollow wire strut is directly in contact with outside air; the open heat sink is exposed to the air, The outside natural wind convects the hot air in the open heat dissipation cavity and the cold air outside by the gap between the plurality of staggered grid-shaped heat conduction bars on the open heat radiator, and quickly maximizes the heat generated by the LED light
  • the heat generated by the electrical cavity does not affect the luminous efficiency and life of the light source:
  • the LED lamp designed by the three-cavity structure design method enables spatial isolation between the LED electrical cavity portion and the LED illumination cavity portion, so that The working environments of the two cavities do not affect each other, and the heat generated by the LED electric cavity part and the LED lighting cavity part does not form a superposition, so the cooling effect is realized by the reasonable arrangement of the space structure, and the LED is further extended. The life of the luminaire and the constant illuminating effect are maintained.
  • FIG. 1 is a schematic structural view of a vertical cross section of Embodiment 1 of an LED lamp for efficient heat dissipation of the present invention.
  • FIG. 1 is a schematic diagram of lateral heat conduction and air convection of the LED lamp shown in FIG. 1.
  • FIG. 2 is an LED of FIG. Schematic diagram of the structure of the luminaire;
  • FIG. 3 is a schematic structural view of a vertical longitudinal section of the LED lamp shown in FIG. 1;
  • FIG. 3a is a schematic diagram of the heat conduction principle of the vertical longitudinal section of the LED lamp shown in FIG. 1;
  • FIG. 3b is a schematic diagram of the air convection principle of the horizontal section of the LED lamp shown in FIG.
  • Embodiment 2 of the LED lamp of the present invention for efficiently dissipating heat
  • FIG. 5 is a schematic structural view of Embodiment 3 of the LED lamp of the present invention for efficiently dissipating heat
  • Embodiment 4 of the LED lamp of the present invention for efficiently dissipating heat
  • Embodiment 7 is a schematic structural view of Embodiment 5 of the LED lamp of the present invention for efficiently dissipating heat
  • Embodiment 6 of the LED lamp of the present invention is a schematic structural view of Embodiment 6 of the LED lamp of the present invention for efficiently dissipating heat
  • Embodiment 7 of the LED lamp of the present invention for efficiently dissipating heat
  • Embodiment 8 of the LED lamp of the present invention for efficiently dissipating heat
  • FIG. 11 is a schematic structural view of Embodiment 9 of the LED lamp of the present invention for efficiently dissipating heat
  • FIG. 12 is a schematic structural view of Embodiment 10 of the LED lamp of the present invention for efficiently dissipating heat.
  • 1 is the upper cover
  • 2 is the PCB circuit board
  • 3 is the PCB mounting board
  • 4 is the LED wire perforation
  • 5 is the LED receiving hole
  • 6 is the open heat sink
  • 7 is the LED light source
  • 8 is the LED base
  • the disc 9 is a translucent cover
  • 10 is a lower cover
  • 11 is an air deflector.
  • the LED lamp with high efficiency heat dissipation is a long street lamp base, including an upper cover 1, 'PCB circuit board 2, PCB mounting board 3, open type
  • the heat sink 6, at least one LED light source unit, the light transmissive cover 9 and the lower cover 10.
  • Each LED light source assembly unit includes a single LED light source 7, a lens, an LED substrate 8 and two conductive leads, the at least one LED light source assembly unit having the same structure and dimensions.
  • the upper cover 1 and the PCB mounting plate 3 are connected to each other to form a sealed electrical cavity I; the PCB circuit board 2 is disposed in the electrical cavity 1.
  • the PCB circuit board 2 can directly supply the working voltage required by the LED light source 7 by using a battery pack, a battery or other power supply device.
  • the open heat sink 6 includes a heat dissipating plate, and one side of the heat dissipating plate is provided with a plurality of staggered heat conducting ribs, and the upper portion of the heat conducting rib and the PCB mounting plate 3 are connected to each other to form an open heat dissipating cavity II.
  • the heat dissipation plate and the heat conduction rib may be an integrated structure.
  • the heat dissipation plates of the transparent cover plate 9, the lower cover 10 and the open heat sink 6 are connected to each other to form a closed LED illumination cavity III; the at least one LED light source 7 is disposed in the LED illumination cavity .
  • the other side of the heat dissipation plate opposite to the heat conducting rib is provided with a plurality of LED wire through holes 4 and a plurality of LED receiving holes 5.
  • Each LED light source 7 corresponds to one LED receiving hole 5 and two LED wire through holes 4; the plurality of LED receiving holes 5 have the same size and are arranged in an array, and the adjacent LED receiving holes 5 are in the lateral direction. Have a consistent spacing with the longitudinal direction.
  • the surface of the heat dissipation plate to which the LED light source 7 is attached may be substantially planar or curved, and each LED light source 7 is attached to a LED receiving hole 5 through the LED substrate 8. Among them, the LED base plate 8 and the teaching hot plate are thermally contacted by a thermal conductive adhesive.
  • the plurality of thermally conductive ribs includes a plurality of hollow wire struts, each of the hollow wire struts for accommodating only one conductive lead of the LED light source assembly unit, each hollow wire struts directly communicating with outside air contact. Having a plurality of wire perforations corresponding to the LED wire perforations 4 on the PCB mounting board 3, each of which Each of the conductive leads of the LED light source assembly unit passes through a hollow wire post on the heat dissipation plate of the open heat sink 6, and is pierced through a wire on the PCB mounting plate 3, and is connected to the PCB circuit board 2, and correspondingly Electronic components enable circuit connections.
  • the PCB mounting board 3, the upper cover 1, the open heat sink 6, the LED base 8, and the lower cover 10 are made of a heat conductive material, and the heat conductive material may be an aluminum alloy or a copper alloy or other heat conductive metal alloy.
  • the LED lamp that efficiently dissipates heat is an LED tunnel lamp.
  • the LED lamp that efficiently dissipates heat is an LED spotlight.
  • the LED lamp that efficiently dissipates heat is an LED floodlight.
  • the LED lamp that efficiently dissipates heat is an LED wall washer.
  • the LED lamp which efficiently dissipates heat is an LED embedded lamp.
  • the LED lamp that efficiently dissipates heat is an LED chandelier.
  • the LED lamp for efficient heat dissipation is an LED ceiling lamp.
  • the LED lamp which efficiently dissipates heat is an LED cup lamp.
  • the LED lamp which efficiently dissipates heat is an LED car headlight.
  • the LED electrical cavity I and the LED illumination cavity III of the LED lamp for outdoor illumination must have a sealing property inside the cavity to meet the waterproof requirement of IP65 or above; the LED electrical cavity of the LED lamp used for indoor illumination I, LED lighting cavity III, the internal sealing of the cavity must meet the waterproof requirements of IP20 or above.
  • a plurality of LED accommodating holes 5 are provided, each of the LED light sources 7 corresponding to one LED accommodating hole 5, and each of the LED light sources 7 It is attached to one of the LED housing holes 5 through the LED substrate 8.
  • the LED receiving hole 5 may not be used, but The LED light source 7 is directly attached to the heat dissipation plate.
  • the LED light source 7 is in contact with the open heat sink 6 through the LED base 8.
  • the LED base 8 may also be omitted, and the LED light source 7 is directly connected to the open heat sink. 6 to achieve contact.
  • the PCB circuit board 2 carrying the circuit is separately provided.
  • the PCB circuit board 2 and the PCB circuit mounting board 3 may be combined into a single PCB circuit board, and the circuit is covered by a lamination process.
  • the positional relationship between the three chambers of the LED electrical cavity I, the open heat dissipation cavity II, and the LED illumination cavity is not fixed, and the positional relationship can be adjusted according to the specific modeling requirements of the lighting fixture. And change.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

L'invention concerne une lampe à DEL à dissipation de chaleur hautement efficace comprenant une plaque d'installation PCB, une plaque de circuit PCB, une source lumineuse à DEL et une lentille. Une cavité d'équipement électrique à DEL, une cavité de dissipation de chaleur de type ouvert et une cavité d'éclairage à DEL sont agencées sur le corps de la lampe de manière séparée. La cavité d'équipement électrique à DEL est constituée d'une plaque de revêtement supérieure, de la plaque de circuit PCB et de la plaque d'installation PCB. Des nervures de grille, sur le côté supérieur du corps de dissipation de chaleur de type ouvert, sont constituées de la cavité de dissipation de chaleur de type ouvert. La surface inférieure du corps de dissipation de chaleur de type ouvert présente des perforations pour les broches de DEL et des trous de retenue de DEL. La cavité d'éclairage à DEL est constituée du corps de dissipation de chaleur de type ouvert, de la source lumineuse à DEL, de la lentille, d'un substrat à DEL, d'un revêtement de lampe et d'une plaque de revêtement inférieure.
PCT/CN2008/000957 2007-05-16 2008-05-16 Lampe à del à dissipation de chaleur hautement efficace WO2008138231A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN200710022390.2 2007-05-16
CNA2007100223902A CN101307891A (zh) 2007-05-16 2007-05-16 高效散热的led灯具

Publications (1)

Publication Number Publication Date
WO2008138231A1 true WO2008138231A1 (fr) 2008-11-20

Family

ID=40001666

Family Applications (2)

Application Number Title Priority Date Filing Date
PCT/CN2007/001722 WO2008138177A1 (fr) 2007-05-16 2007-05-28 Système d'éclairage del avec effet de radiation à haute efficacité
PCT/CN2008/000957 WO2008138231A1 (fr) 2007-05-16 2008-05-16 Lampe à del à dissipation de chaleur hautement efficace

Family Applications Before (1)

Application Number Title Priority Date Filing Date
PCT/CN2007/001722 WO2008138177A1 (fr) 2007-05-16 2007-05-28 Système d'éclairage del avec effet de radiation à haute efficacité

Country Status (2)

Country Link
CN (1) CN101307891A (fr)
WO (2) WO2008138177A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103968298A (zh) * 2014-04-16 2014-08-06 宁波腾隆户外用品有限公司 户外照明灯具
CN104421807A (zh) * 2013-08-22 2015-03-18 江苏卡威汽车工业集团有限公司 一种汽车led大灯

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DE202010003312U1 (de) * 2010-03-09 2011-08-26 Ridi-Leuchten Gmbh Leuchte
CN101907239A (zh) * 2010-08-17 2010-12-08 史杰 Led智能调控环形灯管
WO2013044601A1 (fr) * 2011-09-30 2013-04-04 Yang Dongzuo Affichage matriciel à points à del et affichage matriciel à points combiné
US8985796B2 (en) 2011-11-18 2015-03-24 Shenzhen China Star Optoelectronics Technology Co., Ltd. Backlight system of display device with printed circuit board separate from and mounted to LED substrate with support pillars
CN102384412B (zh) * 2011-11-18 2014-06-18 深圳市华星光电技术有限公司 背光系统
US8899786B1 (en) * 2012-05-04 2014-12-02 Cooper Technologies Company Method and apparatus for light square assembly
CN103423614A (zh) * 2012-05-17 2013-12-04 黄慧娟 一种高效散热的led灯具
CN103196051B (zh) * 2013-03-15 2014-11-26 于德海 一种高效散热的led模组与led显示屏
CN105822959A (zh) * 2016-05-24 2016-08-03 合肥皆达信息科技有限公司 一种可隐藏式led壁灯
CN106299086A (zh) * 2016-09-30 2017-01-04 广州莱迪光电股份有限公司 一种散热led封装结构
CN108413270A (zh) * 2018-04-12 2018-08-17 深圳市新和沃智能科技有限公司 手电筒
CN114606103B (zh) * 2022-03-16 2023-07-25 德默特生物科技(珠海)有限公司 一种杂合式光生物反应器
CN116608453B (zh) * 2023-07-06 2023-10-13 江苏赛鸥电气集团有限公司 一种具有对流散热功能的智慧led节能路灯

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CN1603679A (zh) * 2004-11-09 2005-04-06 李学霖 发光二极管灯散热结构
JP2006331817A (ja) * 2005-05-25 2006-12-07 Matsushita Electric Works Ltd 発光装置及びそれを用いた照明器具
US20070086196A1 (en) * 2005-10-18 2007-04-19 National Tsing Hua University Heat dissipation devices for and LED lamp set
CN201078676Y (zh) * 2007-05-16 2008-06-25 史杰 高效散热的led灯具

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104421807A (zh) * 2013-08-22 2015-03-18 江苏卡威汽车工业集团有限公司 一种汽车led大灯
CN103968298A (zh) * 2014-04-16 2014-08-06 宁波腾隆户外用品有限公司 户外照明灯具

Also Published As

Publication number Publication date
CN101307891A (zh) 2008-11-19
WO2008138177A1 (fr) 2008-11-20

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