WO2009150711A1 - 照明器具 - Google Patents
照明器具 Download PDFInfo
- Publication number
- WO2009150711A1 WO2009150711A1 PCT/JP2008/060580 JP2008060580W WO2009150711A1 WO 2009150711 A1 WO2009150711 A1 WO 2009150711A1 JP 2008060580 W JP2008060580 W JP 2008060580W WO 2009150711 A1 WO2009150711 A1 WO 2009150711A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- heat
- plate
- led
- resin
- heat radiation
- Prior art date
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Classifications
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- 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
- F21V29/502—Cooling arrangements characterised by the adaptation for cooling of specific components
- F21V29/503—Cooling arrangements characterised by the adaptation for cooling of specific components of light sources
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/0201—Thermal arrangements, e.g. for cooling, heating or preventing overheating
- H05K1/0203—Cooling of mounted components
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/0058—Laminating printed circuit boards onto other substrates, e.g. metallic substrates
- H05K3/0064—Laminating printed circuit boards onto other substrates, e.g. metallic substrates onto a polymeric substrate
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/03—Use of materials for the substrate
- H05K1/05—Insulated conductive substrates, e.g. insulated metal substrate
- H05K1/053—Insulated conductive substrates, e.g. insulated metal substrate the metal substrate being covered by an inorganic insulating layer
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
- H05K2201/10007—Types of components
- H05K2201/10106—Light emitting diode [LED]
Definitions
- Patent Document 1 As a solution to such a problem, a lighting fixture described in Patent Document 1 has been conventionally known.
- an LED mounting substrate is directly incorporated in a pair of aluminum casings. This is to improve heat dissipation by taking advantage of the characteristics of aluminum with high thermal conductivity.
- a vent hole or a notch is formed in the housing or the LED mounting substrate, and the heat dissipation effect is further improved through the vent hole and the notch.
- JP 2006-179443 A Japanese Patent No. 3965929
- the above-mentioned aluminum LED mounting substrate must be adhered to the entire surface of the casing.
- the size and shape of the aluminum plate must be changed every time the size and shape of the housing are changed.
- An object of the present invention is to provide a lighting apparatus that can efficiently dissipate heat at a low cost and that does not burn even when directly touched by a person.
- the heat generated when the LED emits light While being quickly diffused by the conductive plate the diffused heat can be released through the thermal radiation plate.
- the heat radiation plate is made of a resin having a high heat emissivity, a sufficient heat dissipation effect can be achieved.
- the durability of the LED can be increased accordingly.
- both surfaces of the heat conductive plate are covered with the resin heat radiation plate having low heat conductivity as described above, even if a person touches directly, there is no feeling of discomfort due to heat.
- the LED board unit is mounted on the heat conduction plate, it is possible to arrange the LED at an arbitrary position on the heat conduction plate without using a custom-made aluminum mounting board, and to provide the characteristics as a lighting fixture. Can be maintained. According to the shape of the housing and the arrangement of the LEDs, the cost is not increased as in the conventional case of designing an electric circuit on an aluminum plate. Furthermore, since the heat conduction plate and the heat radiation plate are made of plate materials and have a three-layer structure, the overall thickness can be increased or decreased. Since the overall thickness can be freely determined in this way, the degree of freedom in design is also increased.
- the weight can be reduced.
- the stability can be maintained even if the base portion is reduced.
- the weight can be reduced and the base portion can be made small, so that the packing efficiency and the transport efficiency are increased.
- weight reduction leads to safety.
- the aluminum constituting the heat conductive plate 3 is a highly conductive metal having a conductivity of 230 [W / (m ⁇ K)] and a heat emissivity of 0.05.
- the ABS resin constituting the heat radiation plates 4 and 5 has a heat conductivity of 0.1 to 0.18 [W / (m ⁇ K)] and a heat emissivity of 0.6 to 0.9.
- the thermal conductivity is low and the thermal emissivity is very high compared to aluminum. That is, resin-made heat radiation plates 4 and 5 having a low heat conductivity and a high heat emissivity are adhered to the exposed portion of the heat conductive plate 3 having a high heat conductivity.
- the heat conducting plate 3 since both surfaces of the heat conducting plate 3 are covered with the heat radiating plates 4 and 5, it is considered that the heat quickly diffused by the heat conducting plate 3 is efficiently transmitted from the surface to the heat radiating plates 4 and 5. .
- heat is quickly transmitted to the heat radiation plates 4 and 5, whereby the high heat emissivity of the heat radiation plates 4 and 5 is utilized more effectively and efficient heat dissipation can be performed.
- the overall heat dissipation performance of the heat conductive plate 3 having a high heat conductivity covered with the heat radiation plates 4 and 5 having a high heat emissivity becomes extremely good, and the LED board unit 1 can be kept at a desired low temperature. It was.
- the temperature of the LED substrate unit 1 can be kept lower than that of the conventional one, so that the light exchange efficiency of the LED can be kept high and the life of the LED can be extended.
- the heat radiation plates 4 and 5 have low thermal conductivity, even if a hand touches the surface covered with the heat radiation plates 4 and 5, the heat radiation plates 4 and 5 do not burn, of course. I don't feel it. This is because the heat is taken away by the hand etc. at the place touched by the hand etc., and the temperature of the contact place falls momentarily, but the heat is applied to the above contact place like when touching the metal casing of the conventional device. It is because it is not transmitted immediately. Therefore, the luminaire of this embodiment can be provided with peace of mind even where there is a possibility of human touch.
- the surface of the heat radiation plates 4 and 5 made of resin does not give a risk of burns or discomfort compared to a metal member even at the same temperature in the initial state. Even if it considers, the temperature of the LED board unit 1 can be set high. In other words, the brightness of the illumination can be increased by increasing the supply current to the LED.
- efficient thermal radiation is implement
- the luminaire shown in FIG. 1 can be reduced in size, the degree of freedom of design as a whole apparatus using this can be increased, and an excellent design can be formed.
- both surfaces of the heat conducting plate 3 are sandwiched between the resin heat radiating plates 4, 5, the aluminum constituting the heat conducting plate 3 and the heat radiating plates 4, 5 are constructed. Even if there is a difference in the coefficient of thermal expansion with the ABS resin, the plate member will not be bent by heat.
- a heat radiation plate made of ABS resin is provided only on one side of the heat conductive plate 3 made of aluminum, the structure may be warped due to the difference in expansion coefficient between them.
- both sides of the heat conduction plate 3 are covered with the resin heat radiation plates 4 and 5 to form a three-layer structure, and both sides of the heat conduction plate are sandwiched between heat radiation plates having the same expansion rate. Even if heat acts, they do not warp. Therefore, each plate member can be made thin to make an ultra-thin lighting fixture.
- the plate thickness of each of the heat conduction plate 3 and the heat radiation plates 4 and 5 is 2 [mm], the thickness is 6 [mm] in three layers, and 10 [W].
- the illuminance at an irradiation distance of 40 [cm] from the light source is 2000 [lx], and it has been confirmed that sufficient heat dissipation can be maintained.
- the said illumination intensity is sufficient brightness as illumination for fine work.
- the heat transfer plate 3 may be provided with a plurality of LED substrate units 1 to obtain a necessary amount of light, or the LED substrate unit 1 on which the plurality of LEDs 2 are mounted. It may be used.
- the lighting fixture of this embodiment can smoothly dissipate the heat generated based on the light emission of the LED while realizing sufficient brightness even with the thinness as described above.
- the position of the light source is adjusted by picking both sides of the lighting fixture with fingers. There will be no burns.
- the heat transfer plate 3 for quickly transmitting the heat of the LED 2 to the heat radiation plates 4 and 5 is a separate member from the LED substrate unit 1. Therefore, it is not necessary to consider the electrical characteristics of the heat conducting plate 3, and the arrangement of the LEDs 2 can be freely set by providing the LED unit 1 thereon. In particular, since LEDs have high light straightness, the brightness of the irradiated surface, how shadows are formed, and the like change depending on the arrangement. Therefore, although arrangement
- the opening 6 is formed in the heat radiating plate 5 provided on the surface on the side where the LED substrate unit 1 is attached in the heat conducting plate 3, the heat conduction is higher than that of the heat radiating plate 4 provided on the opposite side surface.
- the contact area with the plate 3 is small. That is, an area difference between the heat radiation plates 4 and 5 contacting both surfaces sandwiching the heat conducting plate 3 can be made, but if the difference is small, a difference in thermal expansion can be made and the three-layer structure is warped. There is nothing.
- the opening area formed in the heat radiating plate 5 is large, such as when a large number of LED substrate units 1 are provided, the thickness is made thicker than the heat radiating plate 4 and the heat radiating plate 4 provided on the opposite surface. It is necessary to balance.
- the resin-made heat radiation plates 4 and 5 provided on both surfaces of the heat conduction plate 3 are aligned with the outer periphery of the heat conduction plate 3, but the heat conduction plate 3 is exposed.
- the heat radiation plates 4 and 5 are covered and covered with the surface, for example, the heat radiation plates 4 and 5 are made larger than the heat conduction plate 3 as shown in FIG. You may make it the outer periphery of the thermal radiation plates 4 and 5 protrude outside. It should be noted that the amount of protrusion from the outer periphery of the heat conducting plate 3 does not have to be the same for the heat radiation plates 4 and 5, and only one of the heat radiation plates 4 or 5 may protrude.
- the end face of the heat conducting plate 3 may be covered with the heat radiating plate 4 or 5.
- the lighting fixture of the said embodiment is a shape applicable to a stand type apparatus
- the lighting fixture of this invention is applicable also to the pendant type apparatus suspended from the top. Even in that case, it is possible to realize a lighting apparatus that is small and light, has high heat dissipation efficiency, is bright, and has a long life, while making use of the super thin and excellent design. Moreover, since there is no discomfort due to the heat when touched by the hand, it can be lowered to a low position where it can be touched by the hand. In particular, in the case of a pendant type, there is also an advantage that safety is increased by weight reduction.
- an aluminum plate is used as the heat conducting plate of the present invention, but the material of the heat conducting plate is not limited to aluminum. Any ordinary metal satisfies the function as a heat conduction plate.
- copper has a thermal conductivity of 420 [W / m ⁇ K], which is higher than that of aluminum, and other metals have a higher thermal conductivity than ordinary resins.
- the weight can be further reduced. And if it becomes possible to reduce the size and weight, it is possible to realize a lighting device with better design.
- the material constituting the heat radiation plates 4 and 5 is not limited to the ABS resin of the above embodiment, but has a low thermal conductivity such as acrylic, polypropylene, polystyrene, acrylonitrile / styrene copolymer, and the like. A high general resin can be used. Note that the thermal radiation plates 4 and 5 do not necessarily have to be the same as long as the materials have similar coefficients of thermal expansion.
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Manufacturing & Machinery (AREA)
- General Engineering & Computer Science (AREA)
- Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
Abstract
Description
また、LED基板ユニットは、白熱電球や蛍光灯などの他の光源に比べて、小さいため、デザイン性に優れた薄型照明器具としての期待も高い。
しかし、上記LED基板ユニットが光を発するときには、かなりの高熱を発生する。この熱によってLEDが高温になると、電気エネルギーの光への変換効率が悪くなってしまって、LEDの低消費電力であるという特徴を活かせないうえ、LEDの寿命も短くなってしまう。
また、筐体を構成するアルミは熱伝導率が高いので、高温になったアルミに手などをじかに触れると、手が触れて熱が奪われた部分に、どんどん高熱が供給され続けることになる。そのために、使用者がそれをじかに触ったときに、熱伝導率が低いものに触れたときよりも、より熱く感じる。その熱さのために、使用者が不快感を覚えたりするという問題があった。
しかし、樹脂は熱放射性はよいが、熱伝導性が悪いので、LEDが発光するときの熱が、筐体全表面に伝わり難くなり、その分、放熱性も悪くなるという問題が発生する。
しかし、上記のように、LED実装基板に熱の拡散機能を兼ねさせると、LED実装基板の面積を樹脂製の筐体と同じような大きさにしなければならない。なぜなら、LED発光時の熱を、樹脂製の筐体全面に効率よく伝達するためには、上記アルミ製のLED実装基板を筐体全面に密着させなければならないからである。このように筐体全面にLED実装基板を密着させるためには、筐体の大きさや形状が変わるごとに、アルミ板の大きさや形状も変えなければならない。
なお、上記LED基板ユニットとは、LEDチップを基板に実装してユニット化した部品のことである。
しかも、上記のように熱伝導板の両面を熱伝導率の低い樹脂製の熱放射板で覆っているので、人が直接触れたとしても、熱さによる不快感を覚えることがなくなる。
さらに、熱伝導板及び熱放射板は板材からなり、しかもそれらを三層構造にしているので、全体的な厚さを厚くしたり薄くしたりできる。このように全体の厚さを自由に決められるので、そのデザインの自由度も高まる。特に、それぞれの板は、熱の伝導あるいは放射の機能だけ備えていればよいので、それらを薄くしようとすれば、極限まで薄くできる。例えば、この照明器具を電気スタンドに応用したときには、従来にないまったく新しい、超薄型の斬新なデザインを実現できる。
さらに、当該照明器具を上からつるす構造にしたときには、軽量化が安全性につながることになる。
一方、上記のように当該照明器具を薄くすると、その板状の器具を指で挟み持つことが多くなる。しかし、上記のように熱伝導板の両面を樹脂製の熱放射板で覆っているので、それを指で摘んだとしても、熱さによる不快感を覚えたりしない。
第2の発明によれば、照明器具全体を軽量化できる。
この実施形態では、LED基板ユニット1をこのアルミ製の熱伝導板3に装着し、この熱伝導板3の両面であって、LED基板ユニット1の取り付け部分を除いた全面に、ABS樹脂(アクリロニトリル・ブタジエン・スチレン共重合体)製の熱放射板4,5を密着させて、これら熱放射板4,5と熱伝導板3とによって三層構造を構成している。但し、上記熱伝導板3の表面であって、LED基板ユニット1を装着している側の面に設けた熱放射板5には、LED基板ユニット1の装着部分に対応する開口6を形成している。
なお、上記LED基板ユニット1は、基板にLEDチップ2を実装して、ユニット化した市販品である。
つまり、熱伝導率の高い熱伝導板3の露出部分に、熱伝導率が低く、熱放射率が高い樹脂製の熱放射板4,5を密着させている。
上記熱伝導板3内を高速で伝わった熱は、熱伝導板3と熱放射板4,5との接着面まで到達してから、熱放射板4,5内を伝わってその表面から外気に放射される。
その結果、熱伝導率の高い熱伝導板3を熱放射率の高い熱放射板4,5で覆った全体の放熱性がきわめてよくなり、LED基板ユニット1を所期の低温に保つことができた。
この実施形態によればLED基板ユニット1の温度を従来のものよりも低く保てるので、LEDの光交換効率を高く保つことができるとともに、LEDの寿命も長くすることができる。
従って、この実施形態の照明器具は、人が触れる可能性がある所にも、安心して設けることができる。
このように、上記樹脂製の熱放射板4,5の表面は、初期状態で同じ温度でも金属製の部材と比べて、火傷の危険性や、不快感を与えることがないので、熱対策を考慮したとしても、LED基板ユニット1の温度を高めに設定できる。言い換えれば、LEDへの供給電流を多くして照明の明るさを増すこともできる。
さらに、図1に示す照明器具が小型化できれば、これを利用した装置全体としてのデザインの自由度も高くなり、デザイン性に優れたものを形成することもできる。
なお、この照度を実現するために、上記伝熱板3には、複数のLED基板ユニット1を設けて必要な光量を得るようにしてもよいし、複数のLED2を実装したLED基板ユニット1を用いてもよい。
特に、上記したような超薄型のスタンドタイプの照明器具の場合、照明器具の両面を指で摘んで光源の位置を調整することがあるが、その際にも、不快な熱さを感じたり、火傷をしたりすることがない。
特にLEDは光の直進性が高いので、その配置によって照射面の明るさや、影のでき方などが変化する。そのため、照明器具にとっては複数のLED2の配置は重要であるが、この実施形態の照明器具では、LED2の配置の変更も容易である。
さらに、上記実施形態の照明器具は、スタンドタイプの装置に応用可能な形状であるが、この発明の照明器具は、上から吊るすペンダントタイプの装置にも応用できる。その場合にも、超薄型の優れたデザイン性を活かしながら、小型、軽量であって、放熱効率が高く、明るく、寿命も長い照明器具を実現できる。しかも、手でふれたときの熱さによる不快感もないので、手で触れる可能性がある低い位置まで下げて用いることもできる。特に、ペンダントタイプの場合には、軽量化によって安全性が高くなるというメリットもある。
また、上記熱放射板4,5を構成する材質も、上記実施形態のABS樹脂に限らず、アクリル、ポリプロピレン、ポリスチレンや、アクリロニトリル・スチレン共重合体など、熱伝導率が低く、熱放射率の高い一般的な樹脂を用いることができる。
なお、上記熱放射板4,5は、熱膨張率が近い材質であれば、必ずしも同一のものを用いなくてもよい。
2 LED
3 (金属製の)熱伝導板
4、5 (樹脂製の)熱放射板
Claims (2)
- 熱伝導率の高い金属製の熱伝導板上にLED基板ユニットを装着し、この熱伝導板の両面であって、上記LED基板ユニットの取り付け部分を除いた全露出面に、熱放射率が高く、熱伝導率が低い樹脂製の熱放射板を密着させて、上記熱伝導板とその両面に設けた熱放射板とで三層構造とし、上記LED基板ユニットから放出される熱を、上記熱伝導板内で拡散させて上記樹脂製の熱放射板に伝達し、伝達された熱を上記樹脂製の熱放射板から外気へ放出する構成にした照明器具。
- 上記熱伝導板を、アルミ製にした請求項1に記載のLED照明器具。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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JP2010515301A JP4549437B2 (ja) | 2008-06-10 | 2008-06-10 | 照明器具 |
PCT/JP2008/060580 WO2009150711A1 (ja) | 2008-06-10 | 2008-06-10 | 照明器具 |
CN2008801297145A CN102057217A (zh) | 2008-06-10 | 2008-06-10 | 照明器具 |
US12/996,895 US8283842B2 (en) | 2008-06-10 | 2008-06-10 | LED lighting apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2008/060580 WO2009150711A1 (ja) | 2008-06-10 | 2008-06-10 | 照明器具 |
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Publication Number | Publication Date |
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WO2009150711A1 true WO2009150711A1 (ja) | 2009-12-17 |
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PCT/JP2008/060580 WO2009150711A1 (ja) | 2008-06-10 | 2008-06-10 | 照明器具 |
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US (1) | US8283842B2 (ja) |
JP (1) | JP4549437B2 (ja) |
CN (1) | CN102057217A (ja) |
WO (1) | WO2009150711A1 (ja) |
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JP2012146439A (ja) * | 2011-01-11 | 2012-08-02 | Toshiba Lighting & Technology Corp | 照明器具 |
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US9140421B2 (en) * | 2011-08-12 | 2015-09-22 | Tsmc Solid State Lighting Ltd. | Lighting device for direct and indirect lighting |
US10775028B2 (en) * | 2014-12-11 | 2020-09-15 | Datalogic Ip Tech S.R.L. | Printed circuit board aperture based illumination system for pattern projection |
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2008
- 2008-06-10 JP JP2010515301A patent/JP4549437B2/ja active Active
- 2008-06-10 US US12/996,895 patent/US8283842B2/en active Active
- 2008-06-10 WO PCT/JP2008/060580 patent/WO2009150711A1/ja active Application Filing
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Patent Citations (2)
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JPS62211973A (ja) * | 1986-03-12 | 1987-09-17 | Honda Motor Co Ltd | 発光ダイオ−ドを用いた灯火装置 |
JP2002093206A (ja) * | 2000-09-18 | 2002-03-29 | Stanley Electric Co Ltd | Led信号灯具 |
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JP2012146439A (ja) * | 2011-01-11 | 2012-08-02 | Toshiba Lighting & Technology Corp | 照明器具 |
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US8283842B2 (en) | 2012-10-09 |
US20110163649A1 (en) | 2011-07-07 |
JP4549437B2 (ja) | 2010-09-22 |
JPWO2009150711A1 (ja) | 2011-11-04 |
CN102057217A (zh) | 2011-05-11 |
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