WO2011108571A1 - 発光装置の冷却システム、およびそれを用いた発光装置 - Google Patents
発光装置の冷却システム、およびそれを用いた発光装置 Download PDFInfo
- Publication number
- WO2011108571A1 WO2011108571A1 PCT/JP2011/054715 JP2011054715W WO2011108571A1 WO 2011108571 A1 WO2011108571 A1 WO 2011108571A1 JP 2011054715 W JP2011054715 W JP 2011054715W WO 2011108571 A1 WO2011108571 A1 WO 2011108571A1
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- Prior art keywords
- emitting device
- light emitting
- light
- cooling system
- heat
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/64—Heat extraction or cooling elements
- H01L33/642—Heat extraction or cooling elements characterized by the shape
-
- 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
- F21V29/54—Cooling arrangements using thermoelectric means, e.g. Peltier elements
-
- 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
- F21V29/71—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks using a combination of separate elements interconnected by heat-conducting means, e.g. with heat pipes or thermally conductive bars between separate heat-sink elements
- F21V29/713—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks using a combination of separate elements interconnected by heat-conducting means, e.g. with heat pipes or thermally conductive bars between separate heat-sink elements in direct thermal and mechanical contact of each other to form a single system
-
- 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
- F21V31/00—Gas-tight or water-tight arrangements
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/52—Encapsulations
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L25/00—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof
- H01L25/16—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof the devices being of types provided for in two or more different main groups of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. forming hybrid circuits
- H01L25/167—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof the devices being of types provided for in two or more different main groups of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. forming hybrid circuits comprising optoelectronic devices, e.g. LED, photodiodes
-
- 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 present invention relates to a cooling system for a light emitting device and a light emitting device using the same.
- the temperature of the cooling element is preferably lower than the ambient temperature.
- Patent Document 1 discloses a method for preventing the occurrence of dew condensation in a cooling device for an electronic device provided with a semiconductor light source including LEDs.
- a cooling object (LED) attached to the heat absorbing surface of the Peltier element is accommodated in a sealed space in which dry air is enclosed.
- the heat absorbed by the heat-absorbing surface of the Peltier element is radiated from the heat-radiating surface of the Peltier element to the outside through the heat transfer parts that form the sealed space, preventing condensation from occurring inside the sealed space while cooling the LEDs.
- LED cooling object
- the present invention provides a cooling system that can reduce the occurrence of condensation around the light emitting device while maintaining the light emitting device at a lower temperature than the surroundings of the light emitting device in a light emitting device including a light emitting body such as an LED. With the goal.
- Another object of the present invention is to provide a light emitting device using the cooling system.
- a cooling system for a light emitting device is a cooling system for a light emitting device including a light emitter, and the cooling system is a sealed space in which air is enclosed and which houses the light emitting device. And a sealed space formed by the heat radiating member and a cover film having a two-layer structure fixed to the heat radiating member, and is provided in contact with the heat radiating member inside the sealed space to absorb heat from the light emitting device.
- a cooling element having a heat absorbing surface and a heat radiating surface that contacts the heat radiating member and releases heat absorbed by the heat absorbing surface through the heat radiating member; and between the light emitting device and the cooling element, one surface being a cooling element
- a metal plate that is in contact with the heat-absorbing surface and the other surface is in contact with the light-emitting device, and the cover film is located on the outside of the sealed space and the inside of the sealed space and emits light.
- Light exit surface of body through resin film A metal film having an opening formed to out, and a.
- the light-emitting body includes a semiconductor light-emitting element, and uses the light-emitting device cooling system described above.
- a cooling system capable of reducing the occurrence of condensation around the light-emitting device while maintaining the light-emitting body at a lower temperature than the surroundings of the light-emitting device; A light emitting device using the cooling system can be provided.
- FIG. 2 is a schematic sectional view taken along the line A-A ′ of FIG. 1.
- FIG. 2 is a schematic sectional view taken along line B-B ′ of FIG. 1.
- the cooling system of the present invention will be described by taking as an example a light emitting device to which the light emitter is a semiconductor light emitting element (light emitting diode (LED)) as a light emitting device to which the cooling system is applied.
- the light emitter is a semiconductor light emitting element (light emitting diode (LED)) as a light emitting device to which the cooling system is applied.
- LED light emitting diode
- FIG. 1 is a perspective view schematically showing a light emitting device using the cooling system of the present embodiment.
- 2 is a schematic cross-sectional view taken along the line A-A ′ in FIG. 1
- FIG. 3 is a schematic cross-sectional view taken along the line BB ′ in FIG. 1.
- a Peltier element 4 that is, a thermoelectric element using the Peltier effect is used as a cooling element for cooling the light emitting device 10 including the light emitter 1.
- the light emitting body 1 to be cooled is an LED element 1a covered with a protective member 1b made of glass, and the LED element 1a is mounted on an LED substrate 2 made of metal.
- the cooling system of the present embodiment includes a Peltier element 4, a heat sink (heat radiating member) 14 provided in contact with the heat radiating surface 4b of the Peltier element 4, and a cover film having a two-layer structure fixed to the heat sink 14 with an adhesive.
- the cooling system has a metal plate 3 provided between the light emitting device 10 and the Peltier element 4. As shown in FIG. 2, the metal plate 3 is attached to the Peltier element 4 so that the bottom surface (one surface) is in contact with the heat absorbing surface 4 a of the Peltier element 4.
- the LED substrate 2 of the light emitting device 10 is fixed to the upper surface (the other surface) of the metal plate 3.
- the light emitting device 10 to be cooled, the metal plate 3, and the Peltier element 4 are accommodated in the sealed space 5 formed by the heat sink 14 and the cover film 11 of the cooling system.
- the Peltier element 4 absorbs heat generated when the LED element 1 a emits light through the LED substrate 2 and the metal plate 3 and releases it from the heat sink 5 together with heat generated when the Peltier element 4 is driven. Therefore, the heat absorbing surface 4a and the heat radiating surface 4b of the Peltier element 4 are the same as or smaller than the area of the bottom surface of the metal plate 3, and the bottom surface of the LED substrate 2 (contact with the upper surface of the metal plate). Surface area). Further, the Peltier element 4 is in contact with the metal plate 3 over the entire heat absorption surface 4 a of the Peltier element 4, and the LED substrate 2 is in contact with the metal plate 3 over the entire bottom surface of the LED substrate 2.
- the heat generated in the LED element 1a is diffused to the metal plate 3 and the heat absorption of the Peltier element 4 It is transmitted to the entire surface 4a.
- the amount of heat absorption per unit area of the heat absorption surface 4a of the Peltier element 4 can be lowered, and the heat absorption efficiency of the Peltier element 4 can be improved.
- the cover film 11 is composed of a high emissivity resin film 12 located outside the sealed space 5 and a low emissivity metal film 13 located inside the sealed space 5.
- the resin film 12 is transparent at least in the visible light region, and has an emissivity of 0.9 or more in the infrared region having a wavelength of 8 ⁇ m to 11 ⁇ m. According to Wien's displacement law, the infrared region having a wavelength of 8 ⁇ m to 11 ⁇ m corresponds to a range from the allowable temperature of an electronic component to the ambient temperature (environmental temperature).
- the metal film 13 made of copper preferably has an emissivity of 0.1 or less in the infrared region with a wavelength of 8 ⁇ m to 11 ⁇ m, and therefore has a glossy surface such as an aluminum foil. Preferably it is.
- the metal film 13 may be made of another metal having such a surface.
- the resin film 11 fixed to the heat sink 14 with the adhesive contacts the resin guard member 15 provided on the metal plate 3 and the light emitter 1 of the light emitting device 10.
- the sealed space 5 is formed together with the heat sink 14.
- the guard member 15 is provided on the metal plate 3 so as to protrude outward from the side surface of the metal plate 3 in order to prevent contact between the metal plate 3 and the metal film 13.
- the guard member 15 preferably has a thermal conductivity of 0.5 W / m ⁇ K or less in order to reduce the thermal conduction between the metal plate 3 and the metal film 13.
- the metal film 13 has an opening 13a corresponding to the light emitting surface of the light emitter 1 so that the light emitting surface, which is the upper surface of the light emitter 1, is exposed to the outside through the transparent resin film 12 on the outside. ing. Thereby, it becomes possible to take out the light radiate
- Air is sealed in the sealed space 5.
- the operation of enclosing air in the sealed space 5, that is, the operation of fixing the cover film 11 to the heat sink 14 with an adhesive is preferably performed in a dry environment. Also, dry gas can be used instead of air.
- the terminal 18 for supplying electric power to the LED element 1a inside the sealed space 5 is embedded in the cover film 11 with an adhesive.
- the mechanism by which the occurrence of condensation in the region outside the cover film 11 is prevented by such a configuration is as follows.
- the peripheral members of the LED element 1a that is, the LED substrate 2 and the metal plate 3, are cooled to a temperature lower than the ambient temperature by the heat absorbed by the Peltier element 4.
- the cover film 11 is cooled by the LED substrate 2 and the metal plate 3, the heat on the resin film 12 side outside the sealed space 5 is taken away by the metal film 13 side inside.
- the resin film 12 that has been deprived of heat in this way and has a lower temperature than the surrounding air (outside air) has a high emissivity, it can receive heat from outside air by radiation. Thereby, even if the heat of the resin film 12 is taken away by the inner metal film 13, it is possible to suppress the spread of the temperature difference between the outside air and the resin film 12, particularly the surface of the resin film 12 that touches the outside air. .
- the metal film 13 positioned inside the sealed space 5 faces the LED substrate 2 and the metal plate 3 which are lower in temperature than the ambient temperature.
- the resin film It is difficult for the heat taken away from 12 to be radiated to the sealed space 5. That is, the heat of the metal film 13 is not easily taken away by the LED substrate 2 or the metal plate 3.
- the low emissivity metal film 13 can also diffuse the heat received by the resin film 12 from the LED element 1 a into the cover film 11 by contacting the light emitting surface of the light emitter 1.
- the temperature difference with the film 11 can be minimized. As a result, it is possible to prevent the occurrence of condensation on the outer surface of the cover film 11.
- the cooling system of the present embodiment it is possible to reduce the occurrence of condensation on the outer surface of the cover film 11 by minimizing the temperature difference between the outside air and the cover film 11 that touches the outside air. It becomes. Moreover, the peripheral member of the LED element 1a cooled by the Peltier element 4 is thermally insulated from the outside air by the air enclosed in the sealed space 5 and the cover film 11, thereby improving the heat absorption performance of the Peltier element 4. It is also possible to reduce the power required for cooling. In the cooling system of the present embodiment, the light emission surface of the light emitter 1 is exposed to the outside through the transparent resin film 12, so that the light emission from the light emitter 1 is not hindered.
- FIG. 4 is a cross-sectional view schematically showing a light emitting device using the cooling system of the present embodiment, and corresponds to FIG.
- the cooling system of the present embodiment is a modification in which the configuration of the member that defines the sealed space 5 is changed with respect to the first embodiment.
- a cover member 21 and a cold plate 24 for water cooling are provided instead of the cover film 11 and the heat sink 14 of the first embodiment.
- Other configurations are the same as those in the first embodiment, and the effects obtained by this embodiment are also the same as those in the first embodiment.
- the same members as those in the first embodiment are denoted by the same reference numerals in the drawings, and description thereof is omitted.
- a cold plate 24 integrated with a metal fixing plate 25 is provided in contact with the heat radiation surface 4 b of the Peltier element 4.
- a cover member 21 having a two-layer structure is fixed to the fixing plate 25 so as to cover the light emitting device 10, the metal plate 3, and the Peltier element 4 via a flexible rubber member 26.
- the cover member 21 is located outside the sealed space 5 and has a resin member 22 having an emissivity of 0.9 or more in an infrared region with a wavelength of 8 ⁇ m to 11 ⁇ m, and an inner wall of the resin member 22 located inside the sealed space 5.
- an aluminum foil 23 provided on the surface.
- a metal film having a glossy surface can be used, or a metal film having an emissivity of 0.1 or less in an infrared region having a wavelength of 8 ⁇ m to 11 ⁇ m can be used.
- the cover member 21 has an emission opening 21a that exposes the light emission surface of the light emitter 1 to the outside.
- the emission opening 21 a is formed in a tapered shape in accordance with the optical path of the light from the light emitter 1 so that the opening diameter increases as the distance from the light emitter 1 increases. Thereby, the light emitted from the LED element 1 accommodated in the sealed space 5 can be extracted to the outside. Further, the opening edge of the emission opening 21 a can be fixed to the light emission surface of the light emitter 1 with an adhesive or the like by adjusting the thickness of the rubber member 26 between the resin member 22 and the fixing plate 25. it can. Thereby, the light-emitting device 10, the metal plate 3, and the Peltier element 4 are accommodated, and the sealed space 5 in which air is accommodated is formed.
- the opening edge of the emission opening 21 a absorbs part of the heat generated in the LED element 1, and the heat is contained in the cover member 21 by the aluminum foil 15. Will be spread.
- FIG. 5 is a cross-sectional view schematically showing a light emitting device using a cooling system according to the third embodiment of the present invention, and corresponds to FIG.
- This embodiment is a modification in which a ring member 37 is additionally provided so as to surround the periphery of the light emitter 1 with respect to the second embodiment.
- the ring member 37 is fixed on the LED substrate 2 in contact with the light emitter 1.
- the opening edge of the emission opening 21 a is fixed to the upper surface of the ring member 37 with an adhesive or the like, thereby forming the sealed space 5.
- the ring member 37 is preferably made of resin or metal having thermal conductivity in order to improve thermal conduction between the light emitter 1 and the cover member 21 in the above-described mechanism for preventing condensation.
- the cover film of the first embodiment in which openings are provided not only in the metal film but also in the resin film can be used.
- the resin film may not be transparent, and the heat sink of the first embodiment can be used instead of the cold plate 24 of the present embodiment.
Abstract
Description
まず、図1から図3を参照して、本発明の第1の実施形態における発光装置の冷却システムについて説明する。
次に、本発明の第2の実施形態における発光装置の冷却システムについて説明する。
図5は、本発明の第3の実施形態における冷却システムを用いた発光装置を概略的に示す断面図であり、図2に対応する図である。
1a LED素子
3 金属板
4 ペルチェ素子
4a 吸熱面
4b 放熱面
5 密閉空間
11 カバー膜
12 樹脂膜
13 金属膜
13a 開口部
14 ヒートシンク
15 ガード部材
21 カバー部材
21a 出射開口部
22 樹脂部材
23 アルミ箔
24 コールドプレート
37 リング部材
Claims (9)
- 発光体を含む発光装置の冷却システムであって、該冷却システムが、
空気が封入され、前記発光装置を収容する密閉空間であって、放熱部材と、該放熱部材に固定された二層構造のカバー膜と、によって形成された密閉空間と、
前記密閉空間の内部で前記放熱部材に接触して設けられ、前記発光装置からの熱を吸収する吸熱面と、前記放熱部材に接触し、前記吸熱面で吸収した熱を前記放熱部材を通じて放出する放熱面と、を有する冷却素子と、
前記発光装置と前記冷却素子との間に設けられ、一方の面が前記冷却素子の前記吸熱面に接触し、他方の面が前記発光装置に接触する金属板と、を有し、
前記カバー膜が、前記密閉空間の外側に位置する透明な樹脂膜と、前記密閉空間の内側に位置し、前記発光体の光出射面を前記樹脂膜を通じて外部に露出させる開口部が形成された金属膜と、から構成されている、
発光装置の冷却システム。 - 発光体を含む発光装置の冷却システムであって、該冷却システムが、
空気が封入され、前記発光装置を収容する密閉空間であって、放熱部材と、該放熱部材に固定された二層構造のカバー部材とによって形成された密閉空間と、
前記密閉空間の内部で前記放熱部材に接触して設けられ、前記発光装置からの熱を吸収する吸熱面と、前記放熱部材に接触し、前記吸熱面で吸収した熱を前記放熱部材を通じて放出する放熱面と、を有する冷却素子と、
前記発光装置と前記冷却素子との間に設けられ、一方の面が前記冷却素子の前記吸熱面と接触し、他方の面が前記発光装置と接触する金属板と、を有し、
前記カバー部材には、前記発光体の光出射面を外部に露出させるとともに、前記発光装置によって密閉されている出射開口部が形成され、
前記カバー部材が、前記密閉空間の外側に位置する樹脂部材と、前記密閉空間の内側に位置する金属膜と、から構成されている、
発光装置の冷却システム。 - 前記出射開口部の開口縁部が、前記発光体の前記光出射面に固着されている、請求項2に記載の発光装置の冷却システム。
- 前記発光装置が、前記発光体の周囲を囲うように前記発光体に接触して設けられたリング部材をさらに含み、
前記出射開口部の開口縁部が、前記リング部材に固着されている、請求項2に記載の発光装置の冷却システム。 - 前記樹脂部材が膜として形成されている、請求項4に記載の発光装置の冷却システム。
- 前記金属板に設けられ、前記金属板の側面よりも外側に突出して、前記金属板と前記金属膜との接触を阻止する、樹脂製のガード部材をさらに有する、請求項1または5に記載の発光装置の冷却システム。
- 前記金属板は、前記一方の面が、前記冷却素子の前記吸熱面全体と接触するとともに、前記他方の面が、前記発光装置の前記金属板との接触面全体と接触する、請求項1から6のいずれか1項に記載の発光装置の冷却システム。
- 前記冷却素子が、ペルチェ効果を利用した熱電素子である、請求項1から7のいずれか1項に記載の発光装置の冷却システム。
- 前記発光体が半導体発光素子を含み、
請求項1から8のいずれか1項に記載の発光装置の冷却システムを用いた発光装置。
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JP2012503203A JP5794225B2 (ja) | 2010-03-05 | 2011-03-02 | 発光装置の冷却システム、およびそれを用いた発光装置 |
US13/582,856 US8845134B2 (en) | 2010-03-05 | 2011-03-02 | Cooling system for light emitting device and light emitting device using the same |
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Also Published As
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US20130003393A1 (en) | 2013-01-03 |
US8845134B2 (en) | 2014-09-30 |
JP5794225B2 (ja) | 2015-10-14 |
JPWO2011108571A1 (ja) | 2013-06-27 |
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