JP2015149133A - Luminaire - Google Patents
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- JP2015149133A JP2015149133A JP2014019887A JP2014019887A JP2015149133A JP 2015149133 A JP2015149133 A JP 2015149133A JP 2014019887 A JP2014019887 A JP 2014019887A JP 2014019887 A JP2014019887 A JP 2014019887A JP 2015149133 A JP2015149133 A JP 2015149133A
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Abstract
Description
本発明は、LEDを光源とする照明装置に関する。 The present invention relates to an illumination device using an LED as a light source.
LEDは、低電力で高輝度の発光が可能であり、しかも長寿命であることから、白熱灯や蛍光灯に代替する照明装置用の光源として注目されている。このようなLEDを用いた照明装置として、円板状の筐体と、この筐体の中央に設けられLEDに給電するための給電部と、この給電部を中心として円環状に配置された複数のLEDと、を備えたものが知られている(例えば、特許文献1参照)。LEDから出射された光は、各々のLEDに対向して設けられたレンズにより配光制御された後、レンズの光出射面側に設けられた拡散カバーにより拡散されて外部に照射される。拡散カバーは、筐体の周縁部に設けられた拡散カバー取付部に取り付けられている。 LEDs are attracting attention as light sources for illuminating devices that replace incandescent lamps and fluorescent lamps because they can emit light with high brightness at low power and have a long lifetime. As an illumination device using such an LED, a disk-shaped housing, a power feeding portion provided at the center of the housing for feeding power to the LED, and a plurality of annularly arranged around the power feeding portion The LED provided with the LED is known (for example, see Patent Document 1). The light emitted from the LEDs is subjected to light distribution control by a lens provided facing each LED, and then diffused by a diffusion cover provided on the light emission surface side of the lens and irradiated to the outside. The diffusion cover is attached to a diffusion cover attachment portion provided at the peripheral edge of the housing.
しかしながら、上述したような照明装置では、装置の中央に給電部が配置され、また、装置の周縁部には拡散カバー取付部が配置されているので、装置の中央及び周縁部までLEDを配置することができない。そのため、LEDから出射された光が、装置の中央及び周縁部まで行き届き難く、照明装置を光出射面側から見たときに装置の中央及び周縁部が暗くなって見栄えが悪い。 However, in the lighting device as described above, the power feeding unit is arranged at the center of the device, and the diffusion cover mounting portion is arranged at the peripheral portion of the device, so that the LEDs are arranged up to the center and the peripheral portion of the device. I can't. Therefore, it is difficult for light emitted from the LED to reach the center and the peripheral portion of the device, and when the illumination device is viewed from the light output surface side, the center and the peripheral portion of the device become dark and poor in appearance.
本発明は、上記課題を解決するものであって、LEDを光源とする照明装置において、LEDから出射された光を装置の中央及び周縁部まで行き届かせることができ、見栄えの良い照明装置を提供することを目的とする。 This invention solves the said subject, Comprising: In the illuminating device which uses LED as a light source, the light radiate | emitted from LED can reach the center and peripheral part of an apparatus, and the illuminating device with good appearance is obtained. The purpose is to provide.
本発明の照明装置は、平板状の筐体と、前記筐体の一面に設けられた光源部と、前記光源部から出射された光の配光を制御する光学部材と、を備え、前記光源部は、複数のLEDを有し、前記複数のLEDは、それぞれの光軸が前記筐体の一面と直交するように配置され、前記光学部材は、前記複数のLEDの各々に対して設けられた複数のレンズを有し、前記複数のレンズは、前記LEDを覆い該LEDからの光が入射するドーム状の入射面と、前記入射面から入射した光が伝搬する媒質部と、前記媒質部を伝搬された光が出射する出射面と、を有し、前記入射面は、前記LEDからの光を前記光軸に対する角度がより大きくなる方向に屈折し、前記出射面は、前記光軸と前記媒質部を伝搬する光の伝搬方向との成す角度を第1屈折角θ1とし、前記光軸と前記出射面から出射した光の伝搬方向との成す角度を第2屈折角θ2としたときに、θ2/θ1の値が、θ1の増加に伴って一旦増加したのち減少するような形状に構成されていることを特徴とする。 The illumination device of the present invention includes a flat housing, a light source unit provided on one surface of the housing, and an optical member that controls light distribution of light emitted from the light source unit, and the light source The unit has a plurality of LEDs, the plurality of LEDs are arranged so that each optical axis is orthogonal to one surface of the housing, and the optical member is provided for each of the plurality of LEDs. A plurality of lenses, the plurality of lenses covering the LED, a dome-shaped incident surface on which light from the LED is incident, a medium portion on which light incident from the incident surface propagates, and the medium portion And the incident surface refracts the light from the LED in a direction in which the angle with respect to the optical axis becomes larger, and the emission surface is in contact with the optical axis. The angle formed by the propagation direction of light propagating through the medium portion is defined as the first refraction angle θ1. When the angle between the optical axis and the propagation direction of the light emitted from the exit surface is the second refraction angle θ2, the value of θ2 / θ1 once increases with the increase of θ1 and then decreases. It is characterized by being configured in such a shape.
前記出射面は、前記θ2/θ1の値が1.1以上となるような形状に構成されていることが好ましい。 The exit surface is preferably configured in a shape such that the value of θ2 / θ1 is 1.1 or more.
前記筐体は、その周縁部に前記光学部材側に折り曲げられ光を反射する反射部を有することが好ましい。 It is preferable that the casing has a reflecting portion that is bent toward the optical member and reflects light at a peripheral portion thereof.
前記光学部材は、前記複数のレンズを互いに接続する接続部を更に有し、1つの部材として形成されていることが好ましい。 It is preferable that the optical member further includes a connection portion that connects the plurality of lenses to each other, and is formed as one member.
前記筐体は、その中央部に開口を有し、前記開口に前記複数のLEDへの給電を制御する給電部が配置されていることが好ましい。 It is preferable that the housing has an opening at a central portion thereof, and a power feeding unit that controls power feeding to the plurality of LEDs is disposed in the opening.
前記光学部材から出射された光を拡散する拡散カバーを更に備え、前記拡散カバーは、その中央部から周縁部に向かうにつれて前記筐体との距離が小さくなるような形状に構成されていることが好ましい。 It further comprises a diffusion cover for diffusing light emitted from the optical member, and the diffusion cover is configured to have a shape such that the distance from the casing decreases from the central portion toward the peripheral portion. preferable.
前記拡散カバーは、その中央部に周縁部よりも高い光拡散性を有する高拡散部を有することが好ましい。 It is preferable that the diffusion cover has a high diffusion portion having a light diffusibility higher than that of the peripheral portion at the center thereof.
前記拡散カバーは、その外面又は内面に光を拡散する拡散層を有することが好ましい。 The diffusion cover preferably has a diffusion layer for diffusing light on the outer surface or the inner surface thereof.
前記拡散層は、光を拡散する拡散剤を内含していることが好ましい。 The diffusion layer preferably includes a diffusing agent that diffuses light.
前記拡散カバーが透光性樹脂により構成され、且つその内面に前記拡散層が設けられている場合に、前記拡散カバーは、その外面に微細な凹凸構造を有することが好ましい。 When the diffusion cover is made of a light-transmitting resin and the diffusion layer is provided on the inner surface thereof, the diffusion cover preferably has a fine uneven structure on the outer surface.
本発明によれば、LEDから出射された光が、レンズの正面方向(LEDの光軸方向)だけでなくレンズの側方にも多く出射するので、LEDから出射された光を装置の中央及び周縁部まで行き届かせて照明装置の見栄えを良くすることができる。 According to the present invention, a large amount of light emitted from the LED is emitted not only in the front direction of the lens (in the direction of the optical axis of the LED) but also on the side of the lens. It is possible to improve the appearance of the lighting device by reaching the periphery.
本発明の一実施形態に係る照明装置について図1乃至図11を参照して説明する。本照明装置は、住空間等の天井面に取り付けられるシーリングライトである。 An illumination device according to an embodiment of the present invention will be described with reference to FIGS. This illuminating device is a ceiling light attached to a ceiling surface of a living space or the like.
図1に示すように、照明装置1は、円板状の筐体2と、筐体2の一面(実装面21)に設けられた光源部3と、光源部3から出射された光の配光を制御する光学部材4と、光学部材4から出射された光を拡散する拡散カバー5と、を備える。筐体2は、その中央に開口22を有し、開口22には光源部3への給電を制御する給電部6が嵌め込まれている。 As shown in FIG. 1, the lighting device 1 includes a disk-shaped housing 2, a light source unit 3 provided on one surface (mounting surface 21) of the housing 2, and a distribution of light emitted from the light source unit 3. An optical member 4 that controls light and a diffusion cover 5 that diffuses light emitted from the optical member 4 are provided. The housing 2 has an opening 22 at the center thereof, and a power feeding unit 6 that controls power feeding to the light source unit 3 is fitted into the opening 22.
筐体2は、実装面21とは反対側の取付面を介して天井面に取り付けられる。筐体2は、実装面21の周縁部に拡散カバー5の取り付けに用いられる拡散カバー取付部23を複数有する。実装面21は、白色塗料の塗布又は光反射性金属材料の蒸着により、例えば、75〜95%の可視光反射性を有する。筐体2は、例えば、所定の剛性を有するアルミニウム板又は鋼板をプレス加工及び切削加工することで形成される。 The housing 2 is attached to the ceiling surface via an attachment surface opposite to the mounting surface 21. The housing 2 has a plurality of diffusion cover attachment portions 23 used for attaching the diffusion cover 5 to the peripheral portion of the mounting surface 21. The mounting surface 21 has a visible light reflectivity of, for example, 75 to 95% by applying a white paint or vapor deposition of a light reflective metal material. The housing 2 is formed, for example, by pressing and cutting an aluminum plate or steel plate having a predetermined rigidity.
光源部3は、複数のLED31と、これらLED31を実装する配線基板32と、を有する。配線基板32は、ドーナツ板状とされ、その中心が筐体2の中心と一致するようにして筐体2の実装面21に取り付けられている。複数のLED31は、配線基板32の実装面21に取り付けられている面とは反対側の面に搭載され、筐体2の中心を中心とする4つの同心円上に配置されている。これらLED31は、それぞれの光軸が実装面21と直交するようにして配置されている。LED31は、例えば、青色光を出射する青色LEDチップと、この青色LEDチップを封止する封止材と、この封止材に分散され青色光を黄色光に変換する蛍光体と、を有し、青色光と黄色光とを互いに混色させることで白色光を出射する白色LEDとされる。配線基板32は、ガラスエポキシ樹脂等の絶縁性材料により構成され、各々のLED31と接続された配線パターン(不図示)を有する。各々の配線パターンは、給電部6の点灯回路(後述参照)と接続されている。 The light source unit 3 includes a plurality of LEDs 31 and a wiring board 32 on which the LEDs 31 are mounted. The wiring board 32 has a donut plate shape, and is attached to the mounting surface 21 of the housing 2 so that the center thereof coincides with the center of the housing 2. The plurality of LEDs 31 are mounted on a surface opposite to the surface attached to the mounting surface 21 of the wiring board 32, and are arranged on four concentric circles centered on the center of the housing 2. These LEDs 31 are arranged such that their optical axes are orthogonal to the mounting surface 21. The LED 31 includes, for example, a blue LED chip that emits blue light, a sealing material that seals the blue LED chip, and a phosphor that is dispersed in the sealing material and converts blue light into yellow light. The white LED emits white light by mixing blue light and yellow light with each other. The wiring board 32 is made of an insulating material such as glass epoxy resin and has a wiring pattern (not shown) connected to each LED 31. Each wiring pattern is connected to a lighting circuit (see later) of the power feeding unit 6.
光学部材4は、配線基板32とほぼ同じ大きさのドーナツ板状とされ、光源部3のLED31を覆うように設けられている。光学部材4は、LED31の各々に対向して設けられた複数のレンズ41と、複数のレンズ41を互いに接続する接続部42と、を有し、1つの部材として構成されている。このように、光学部材4を1つの部材として構成することで、照明装置1の組み立てが容易になって組み立て効率を向上させることができる。光学部材4は、例えば、ポリカーボネート樹脂、アクリル樹脂又はポリスチレン樹脂といった透光性及び電気絶縁性を有する樹脂により構成され、筐体2にネジ止めされる。 The optical member 4 has a donut plate shape that is substantially the same size as the wiring board 32, and is provided so as to cover the LEDs 31 of the light source unit 3. The optical member 4 includes a plurality of lenses 41 provided to face each of the LEDs 31 and a connection portion 42 that connects the plurality of lenses 41 to each other, and is configured as one member. Thus, by comprising the optical member 4 as one member, the assembly of the illuminating device 1 becomes easy and assembly efficiency can be improved. The optical member 4 is made of a resin having translucency and electrical insulation, such as polycarbonate resin, acrylic resin, or polystyrene resin, and is screwed to the housing 2.
拡散カバー5は、筐体2とほぼ同じ直径を有し、光出射方向(図例では上方)に凸となった円形ドーム状とされている。拡散カバー5は、光学部材4を覆うように設けられ、その内周面に筐体2の拡散カバー取付部23と係合する複数の係合部(不図示)を有する。これら係合部が拡散カバー取付部23に係合することで、拡散カバー5は、筐体2に対して着脱可能に取り付けられる。 The diffusion cover 5 has substantially the same diameter as that of the housing 2 and has a circular dome shape that is convex in the light emitting direction (upward in the figure). The diffusion cover 5 is provided so as to cover the optical member 4, and has a plurality of engagement portions (not shown) that engage with the diffusion cover attachment portion 23 of the housing 2 on the inner peripheral surface thereof. The diffusion cover 5 is detachably attached to the housing 2 by engaging these engagement portions with the diffusion cover attachment portion 23.
給電部6は、LED31を点灯駆動するための点灯回路(不図示)を有し、給電コネクタ等を介して商用交流電源に接続されている。点灯回路は、商用交流電源からの交流電流を整流するためのトランス、コンデンサ及び制御用IC等を有し、ユーザの指示に応じて商用交流電源からLED31への給電を制御する。給電部6が筐体2の開口22に嵌め込まれているので、このような開口を設けずに給電部6を筐体の取付面側に配置した場合に比べて、照明装置1を薄型化することができる。 The power feeding unit 6 has a lighting circuit (not shown) for driving the LEDs 31 to be lit, and is connected to a commercial AC power supply via a power feeding connector or the like. The lighting circuit includes a transformer, a capacitor, a control IC, and the like for rectifying an alternating current from a commercial alternating current power supply, and controls power feeding from the commercial alternating current power supply to the LED 31 according to a user instruction. Since the power feeding unit 6 is fitted into the opening 22 of the housing 2, the lighting device 1 is made thinner compared to the case where the power feeding unit 6 is arranged on the mounting surface side of the housing without providing such an opening. be able to.
図2及び図3に示すように、レンズ41は、LED31を覆いLED31からの光が入射するドーム状の入射面43と、入射面43から入射した光が伝搬する媒質部44(図3参照)と、媒質部44を伝搬された光が出射する出射面45と、を有する。出射面45は、更に、LED31の光軸Axと交差する箇所から所定範囲内に広がる第1出射面46と、第1出射面46の周囲に第1出射面46と連続して設けられた第2出射面47と、を有する。第1出射面46は、LED31側に少し凹んだ滑らかな曲面により構成され、第2出射面47は、外方に膨らんだ滑らかな曲面により構成されている。 As shown in FIGS. 2 and 3, the lens 41 covers the LED 31 and has a dome-shaped incident surface 43 on which the light from the LED 31 is incident, and a medium portion 44 through which the light incident from the incident surface 43 propagates (see FIG. 3). And an exit surface 45 from which the light propagated through the medium portion 44 exits. The emission surface 45 further includes a first emission surface 46 that extends within a predetermined range from a location that intersects the optical axis Ax of the LED 31, and a first emission surface 46 that is provided continuously around the first emission surface 46. And two exit surfaces 47. The first emission surface 46 is configured by a smooth curved surface slightly recessed toward the LED 31, and the second emission surface 47 is configured by a smooth curved surface bulging outward.
LED31から出射した光(図3において破線矢印で示す)は、入射面43がドーム状に構成されているので、入射面43において光軸Axに対する角度がより大きくなる方向に屈折される。ここで、光軸Axと媒質部44を伝搬する光の伝搬方向との成す角度を第1屈折角θ1とし、光軸Axと出射面45から出射した光の伝搬方向との成す角度を第2屈折角θ2とする。 The light emitted from the LED 31 (indicated by a broken line arrow in FIG. 3) is refracted in a direction in which the angle with respect to the optical axis Ax becomes larger at the incident surface 43 because the incident surface 43 is configured in a dome shape. Here, the angle formed between the optical axis Ax and the propagation direction of the light propagating through the medium portion 44 is defined as the first refraction angle θ1, and the angle formed between the optical axis Ax and the propagation direction of the light emitted from the emission surface 45 is defined as the second angle. The refraction angle is θ2.
図4に示すように、θ2/θ1の値は、θ1の増加に伴って一旦増加したのち減少するように構成され、図例では、θ1が略33度のときに極大値(略1.70)をとるように構成されている。θ2/θ1の値は、θ1が10〜20度の範囲では略1.6に維持され、θ1が20〜30度の範囲では略1.70(極大値)となるまで漸増し、θ1が30〜70度の範囲では略1となるまで漸減する。なお、θ1が10度以下の範囲でθ2/θ1の値が安定しないのは、θ1が小さい場合には、θ2/θ1の値がθ1の測定誤差の影響を大きく受けるためである。 As shown in FIG. 4, the value of θ2 / θ1 is configured to once increase and then decrease as θ1 increases. In the example shown in FIG. 4, the maximum value (approximately 1.70) is obtained when θ1 is approximately 33 degrees. ). The value of θ2 / θ1 is maintained at approximately 1.6 when θ1 is in the range of 10 to 20 degrees, and gradually increases until θ1 becomes approximately 1.70 (maximum value) when θ1 is in the range of 20 to 30 degrees. It gradually decreases until it becomes approximately 1 in the range of ˜70 degrees. The reason why the value of θ2 / θ1 is not stable when θ1 is in the range of 10 degrees or less is that when θ1 is small, the value of θ2 / θ1 is greatly affected by the measurement error of θ1.
上記のようにレンズ41を構成することで、例えば、θ1=10度の光はθ2=略16度(10度x1.62)でレンズ41から出射され、θ1=20度の光はθ2=略33度(20度x1.63)でレンズ41から出射される。同様にして、θ1=33度の光はθ2=略56度で出射され、θ1=40度の光はθ2=略66度で出射され、θ1=50度の光はθ2=略75度で出射され、θ1=60度の光はθ2=略72度で出射され、θ1=70度の光はθ2=略72度で出射される。 By configuring the lens 41 as described above, for example, light of θ1 = 10 degrees is emitted from the lens 41 at θ2 = approximately 16 degrees (10 degrees × 1.62), and light of θ1 = 20 degrees is θ2 = approximately. The light is emitted from the lens 41 at 33 degrees (20 degrees x 1.63). Similarly, θ1 = 33 degrees light is emitted at θ2 = approximately 56 degrees, θ1 = 40 degrees light is emitted at θ2 = approximately 66 degrees, and θ1 = 50 degrees light is emitted at θ2 = approximately 75 degrees. Thus, light with θ1 = 60 degrees is emitted at θ2 = approximately 72 degrees, and light with θ1 = 70 degrees is emitted at θ2 = approximately 72 degrees.
これにより、図5に示すように、レンズ41から出射される光は、光軸Axに対して略75度の角度を隔てた方向に強く照射される。また、θ1が10〜30度の範囲においてθ2/θ1の値が極大値よりも小さくなるように構成されているので、レンズ41から出射される光は、光軸Ax方向にも所定量照射される。 As a result, as shown in FIG. 5, the light emitted from the lens 41 is strongly irradiated in a direction at an angle of about 75 degrees with respect to the optical axis Ax. In addition, since θ2 / θ1 is configured to be smaller than the maximum value in the range of θ1 of 10 to 30 degrees, a predetermined amount of light emitted from the lens 41 is also irradiated in the optical axis Ax direction. The
上述したように、レンズ41は、光軸Axに対して75度の方向に強い光を出射するので、レンズ41を光軸Axに対して斜めの方向(例えば、光軸Axに対して60度の方向)から見ると、レンズ41の手前側が明るく奥側が暗く感じることがある。そこで、図6に示すように、レンズ41の変形例であるレンズ41aでは、レンズ41(形状を破線で示す)に比べて、第1出射面46のLED31側への凹みが浅くなり、且つ第2出射面47の外方への膨らみが小さくなっている。 As described above, since the lens 41 emits strong light in a direction of 75 degrees with respect to the optical axis Ax, the lens 41 is inclined with respect to the optical axis Ax (for example, 60 degrees with respect to the optical axis Ax). ), The near side of the lens 41 may feel bright and the far side dark. Therefore, as shown in FIG. 6, in the lens 41 a which is a modification of the lens 41, the depression on the LED 31 side of the first emission surface 46 becomes shallower than the lens 41 (the shape is indicated by a broken line), and the first 2 The outward bulge of the emission surface 47 is reduced.
図7に示すように、レンズ41aにおけるθ2/θ1の値(黒ダイヤで示す)は、レンズ41におけるθ2/θ1の値(白四角で示す)に比べて、θ1<33度の範囲で小さく、θ1>60度の範囲で大きく且つ1.1以上となるように構成されている。θ1<33度の範囲でθ2/θ1の値を小さくすることで、レンズ41に比べて、LED31から光軸Ax方向に出射された光の屈折度合が小さくなるので、レンズ41aから光軸Ax方向に出射する光が増加する。また、θ1>60度の範囲でθ2/θ1の値を大きくすることで、レンズ41に比べて、LED31から側方に出射した光が大きく屈折され(例えば、θ1=70度の光はθ2=略84度で出射される)、レンズ41aの側方に出射する光が増加する。 As shown in FIG. 7, the value of θ2 / θ1 (indicated by a black diamond) in the lens 41a is smaller in the range of θ1 <33 degrees than the value of θ2 / θ1 (indicated by a white square) in the lens 41. It is configured to be large and 1.1 or more in the range of θ1> 60 degrees. By reducing the value of θ2 / θ1 in the range of θ1 <33 degrees, the degree of refraction of the light emitted from the LED 31 in the optical axis Ax direction becomes smaller than that of the lens 41, and thus the optical axis Ax direction from the lens 41a. Increasing the light emitted to. Further, by increasing the value of θ2 / θ1 in the range of θ1> 60 degrees, the light emitted from the LED 31 to the side is largely refracted as compared to the lens 41 (for example, θ2 = 70 degrees light is θ2 = The light emitted to the side of the lens 41a increases.
これにより、図8に示すように、レンズ41aから出射する光(実線で示す)は、レンズ41から出射する光(破線で示す)に比べて、より多く光軸Ax方向に照射され、また、より光軸Axに対して角度を隔てた方向に照射される。なお、本図では、理解を易しくするために、レンズ41、41aの各々から出射する光の最大光度をそれぞれ1.0として描画している。このように、レンズ41aから照射される光は、レンズ41から照射される光に比べて、より広い範囲に照射される。そのため、レンズ41aを照明装置1に組み込み、照明装置1の光照射面を光軸Axに対して斜めの方向(例えば、光軸Axに対して60度の方向)から見た場合、レンズ41を照明装置1に組み込んだときに比べて、照明装置1の奥側が暗くなり難い。 Thereby, as shown in FIG. 8, the light emitted from the lens 41a (shown by a solid line) is more irradiated in the direction of the optical axis Ax than the light emitted from the lens 41 (shown by a broken line). Further, the light is irradiated in a direction separated from the optical axis Ax by an angle. In this figure, for ease of understanding, the maximum luminous intensity of light emitted from each of the lenses 41 and 41a is drawn as 1.0. Thus, the light irradiated from the lens 41a is irradiated over a wider range than the light irradiated from the lens 41. Therefore, when the lens 41a is incorporated in the lighting device 1 and the light irradiation surface of the lighting device 1 is viewed from an oblique direction with respect to the optical axis Ax (for example, a direction of 60 degrees with respect to the optical axis Ax), the lens 41 is Compared to when incorporated in the lighting device 1, the back side of the lighting device 1 is less likely to be dark.
図9に示すように、筐体2は、その周縁部に光学部材4側に折り曲げられ光を反射する反射部24を有する。反射部24は、例えば、筐体2の一部を折り曲げ加工し、そこに白色塗料を塗布又は光反射性金属材料を蒸着することで形成される。反射部24は、レンズ41から照明装置1の側方に向けて出射された光(破線矢印で示す)を反射して拡散カバー5の方に向かわせる。これにより、照明装置1の周縁部における照射光輝度を増加させることができる。 As shown in FIG. 9, the housing 2 has a reflection portion 24 that is bent toward the optical member 4 side and reflects light at the peripheral portion thereof. The reflection part 24 is formed by, for example, bending a part of the housing 2 and applying a white paint or vapor-depositing a light reflective metal material thereto. The reflection unit 24 reflects light (indicated by a broken line arrow) emitted from the lens 41 toward the side of the illumination device 1 and directs the light toward the diffusion cover 5. Thereby, the illumination light brightness | luminance in the peripheral part of the illuminating device 1 can be increased.
また、拡散カバー5は、その中央部から周縁部に向かうにつれて筐体2との距離が小さくなるような形状に構成されている。図例では、拡散カバー5の中央部は、筐体2と略平行に形成された平坦部51とされ、平坦部51から周縁部にかけては、所定の角度で傾斜した傾斜部52となっている。このようにすることで、レンズ41から出射されて傾斜部52に入射した光(部分拡大図において一点鎖線矢印で示す)の拡散カバー5と外界との界面53への入射角θ3が小さくなるので、界面53における光の全反射を抑制して光の取り出し効率を向上できる。なお、図9では断面ハッチングの図示を省略している。 Further, the diffusion cover 5 is configured in such a shape that the distance from the housing 2 becomes smaller from the central part toward the peripheral part. In the illustrated example, the central portion of the diffusion cover 5 is a flat portion 51 formed substantially parallel to the housing 2, and an inclined portion 52 that is inclined at a predetermined angle from the flat portion 51 to the peripheral portion. . By doing so, the incident angle θ3 of the light emitted from the lens 41 and incident on the inclined portion 52 (indicated by a one-dot chain line arrow in the partial enlarged view) to the interface 53 between the diffusion cover 5 and the outside world is reduced. Further, it is possible to improve the light extraction efficiency by suppressing the total reflection of light at the interface 53. In addition, illustration of cross-sectional hatching is abbreviate | omitted in FIG.
図10(a)に示すように、拡散カバー5は、透光性樹脂により構成された基材54と、基材54の外面(光出射面)に積層され光を拡散する拡散層55と、を有する。基材54は、例えば、アクリル樹脂やポリスチレン樹脂により構成され、拡散カバー5に機械的強度を与える。拡散層55は、光を拡散する拡散剤56を内含する塗装膜により構成されている。拡散剤56は、例えば、粒子状二酸化チタン、粒子状二酸化ケイ素又は粒子状セラミックにより構成され、拡散カバー5の周縁部では疎に分散され、中央部では密に分散されている。拡散剤56が密に分散された拡散カバー5の中央部は、周縁部よりも高い光拡散性を有する高拡散部57となっており、図例では、平坦部51が高拡散部57となっている。このような高拡散部57を設けることで、高拡散部57に入射した光が拡散剤56により拡散され、界面53での光の全反射が抑制される。これにより、高拡散部57から外部に出射する光が増加して、照明装置1の中央部における照射光輝度を増加させることができる。 As shown in FIG. 10 (a), the diffusion cover 5 includes a base material 54 made of a translucent resin, a diffusion layer 55 that is laminated on the outer surface (light emission surface) of the base material 54, and diffuses light. Have The base material 54 is made of, for example, an acrylic resin or a polystyrene resin, and gives mechanical strength to the diffusion cover 5. The diffusion layer 55 is configured by a coating film containing a diffusion agent 56 that diffuses light. The diffusing agent 56 is made of, for example, particulate titanium dioxide, particulate silicon dioxide, or particulate ceramic, and is sparsely dispersed at the peripheral portion of the diffusion cover 5 and densely dispersed at the central portion. The central portion of the diffusion cover 5 in which the diffusing agent 56 is densely dispersed is a high diffusion portion 57 having light diffusibility higher than that of the peripheral portion. In the example shown in the figure, the flat portion 51 is the high diffusion portion 57. ing. By providing such a high diffusion portion 57, the light incident on the high diffusion portion 57 is diffused by the diffusing agent 56, and the total reflection of light at the interface 53 is suppressed. Thereby, the light radiate | emitted outside from the high-diffusion part 57 increases, and the irradiation light brightness | luminance in the center part of the illuminating device 1 can be made to increase.
基材54を1.5mm厚の透明アクリル樹脂により構成し、その光出射面側に6μm厚の拡散層55を設けた拡散カバー5は、例えば、波長555nmの光に対して67%の透過率及び60%の拡散率を示す。一方、1.5mm厚のアクリル乳白パネルのみから成る一般的な拡散カバーは、例えば、波長555nmの光に対して61%の透過率及び61%の拡散率を示す。この結果は、拡散カバー5によれば、一般的な拡散カバーに比べて、拡散率を低下させることなく透過率を向上させることができることを示している。 The diffusion cover 5 in which the base material 54 is made of a transparent acrylic resin having a thickness of 1.5 mm and the diffusion layer 55 having a thickness of 6 μm is provided on the light emitting surface side thereof has, for example, a transmittance of 67% with respect to light having a wavelength of 555 nm. And a diffusivity of 60%. On the other hand, a general diffusion cover composed only of an acrylic milk white panel having a thickness of 1.5 mm exhibits a transmittance of 61% and a diffusion rate of 61% for light having a wavelength of 555 nm, for example. This result shows that according to the diffusion cover 5, the transmittance can be improved without reducing the diffusion rate as compared with a general diffusion cover.
なお、図10(b)に示すように、拡散カバー5は、基材54の内面(光入射面)に拡散層55を有する構成とされてもよい。この場合には、透光性樹脂により構成された基材54が外側に露出するので、透光性樹脂の光沢感が目立って照明装置1の見栄えが悪くなることがある。そこで、基材54の外面に、微細な凹凸構造58を設けることが好ましい。凹凸構造58は、例えば、基材54の外面にサンドブラスト処理を施すことで形成される。このような凹凸構造58を設けることで、凹凸構造58により光が乱反射されるので、ユーザが拡散カバー5を見たときに光沢感を感じ難くなり照明装置1の見栄えを良くすることができる。基材54を1.5mm厚の透明アクリル樹脂により構成し、その光入射面側に6μm厚の拡散層55を設けた拡散カバー5は、例えば、波長555nmの光に対して72%の透過率及び53%の拡散率を示す。 As shown in FIG. 10B, the diffusion cover 5 may be configured to have a diffusion layer 55 on the inner surface (light incident surface) of the base material 54. In this case, since the base material 54 made of the translucent resin is exposed to the outside, the glossiness of the translucent resin is conspicuous and the appearance of the lighting device 1 may be deteriorated. Therefore, it is preferable to provide a fine concavo-convex structure 58 on the outer surface of the substrate 54. The concavo-convex structure 58 is formed, for example, by subjecting the outer surface of the base material 54 to sandblasting. By providing such a concavo-convex structure 58, light is irregularly reflected by the concavo-convex structure 58, so that it is difficult for the user to feel the gloss when the diffuser cover 5 is viewed, and the appearance of the lighting device 1 can be improved. The diffusion cover 5 in which the base 54 is made of a transparent acrylic resin having a thickness of 1.5 mm and the diffusion layer 55 having a thickness of 6 μm is provided on the light incident surface side thereof has, for example, a transmittance of 72% for light having a wavelength of 555 nm. And a diffusivity of 53%.
照明装置1によれば、LED31から出射された光が、レンズ41(又は41a)の正面方向(光軸Ax方向)だけでなく、レンズ41の入射面43及び出射面45で屈折されてレンズ41の側方に多く照射される。これにより、LED31からの光を装置中央及び周縁部まで行き届かせることができる。また、高拡散部57及び反射部24が設けられているので、照明装置1の中央及び周縁部における照射光輝度を増加させることができる。その結果、図11に示すように、照明装置1は、図12に示す従来の照明装置に比べて、より均一に光を照射することができ、照明装置1の見栄えが良くなる。 According to the illuminating device 1, the light emitted from the LED 31 is refracted not only in the front direction (the optical axis Ax direction) of the lens 41 (or 41 a) but also in the entrance surface 43 and the exit surface 45 of the lens 41. A lot of light is irradiated to the side. Thereby, the light from LED31 can reach the apparatus center and a peripheral part. Moreover, since the high-diffusion part 57 and the reflection part 24 are provided, the irradiation light brightness | luminance in the center and peripheral part of the illuminating device 1 can be increased. As a result, as shown in FIG. 11, the illumination device 1 can irradiate light more uniformly than the conventional illumination device shown in FIG. 12, and the appearance of the illumination device 1 is improved.
次に、他の実施形態に係る照明装置について図13及び図14を参照して説明する。照明装置11は、照明装置1とは外形が異なり、平面視において矩形状とされる。 Next, lighting devices according to other embodiments will be described with reference to FIGS. 13 and 14. The illuminating device 11 has a different external shape from the illuminating device 1 and has a rectangular shape in plan view.
照明装置11では、光源部3が平面視において矩形状とされ、図例では、矩形状の配線基板32にLED31がマトリクス状に配置されている。また、光学部材4も、平面視において矩形状とされている。筐体2は、一面に開口を有する矩形の箱体とされ、その開口より光学部材4からの光が出射するように光源部3及び光学部材4を収容している。また、筐体2の内側面が、反射部24となっている。拡散カバー5は、矩形平板状とされ、矩形の枠体59により保持されている。これら筐体2、光源部3及び光学部材4は、ケース7に収容されている。ケース7は、その一面に開口を有する矩形の箱体とされ、開口より光学部材4からの光が出射するように筐体2、光源部3及び光学部材4を収容している。拡散カバー5は、枠体59がケース7の開口に嵌め入れられることで、該開口を塞ぐようにしてケース7に取り付けられる。反射部24から直近のLED31までの距離、LED31間の距離、LED31から拡散カバー5までの距離及び筐体2の底面から拡散カバー5までの距離は、例えば、それぞれ12.1〜29.25mm、15〜60mm、35.8mm及び37.1mmとされる。 In the illuminating device 11, the light source part 3 is made into a rectangular shape in plan view, and in the illustrated example, LEDs 31 are arranged in a matrix on a rectangular wiring board 32. The optical member 4 is also rectangular in plan view. The housing 2 is a rectangular box having an opening on one surface, and houses the light source unit 3 and the optical member 4 so that light from the optical member 4 is emitted from the opening. In addition, the inner side surface of the housing 2 is a reflecting portion 24. The diffusion cover 5 has a rectangular flat plate shape and is held by a rectangular frame body 59. The housing 2, the light source unit 3, and the optical member 4 are accommodated in a case 7. The case 7 is a rectangular box having an opening on one surface, and accommodates the housing 2, the light source unit 3, and the optical member 4 so that light from the optical member 4 is emitted from the opening. The diffusion cover 5 is attached to the case 7 so as to close the opening by fitting the frame body 59 into the opening of the case 7. The distance from the reflector 24 to the nearest LED 31, the distance between the LEDs 31, the distance from the LED 31 to the diffusion cover 5, and the distance from the bottom surface of the housing 2 to the diffusion cover 5 are, for example, 12.1 to 29.25 mm, 15-60 mm, 35.8 mm, and 37.1 mm.
上記のように構成された照明装置11によれば、上述した照明装置1と同様の効果を与えることができる矩形状の照明装置が得られる。 According to the illuminating device 11 configured as described above, a rectangular illuminating device that can provide the same effects as those of the illuminating device 1 described above can be obtained.
なお、本発明に係る照明装置は、上記実施形態に限定されず種々の変形が可能である。例えば、筐体は、反射部を有さない構成とされてもよい。また、LEDを、例えば、昼光色の光を発するものと電球色の光を発するものの2種により構成し、これら2種のLEDを互いに独立に調光制御して照射光の光色を調整することができる構成としてもよい。 In addition, the illuminating device according to the present invention is not limited to the above embodiment, and various modifications can be made. For example, the housing may be configured not to have a reflecting portion. In addition, for example, the LED is composed of two types, one that emits daylight color light and the other that emits light bulb color light, and the light color of irradiation light is adjusted by dimming control of these two types of LEDs independently of each other. It is good also as a structure which can do.
1、 11 照明装置
2 筐体
21 実装面(筐体の一面)
22 (筐体の)開口
24 反射部
3 光源部
31 LED
4 光学部材
41、41a レンズ
42 接続部
43 入射面
44 媒質部
45 出射面
5 拡散カバー
55 拡散層
56 拡散剤
57 高拡散部
58 凹凸構造
6 給電部
Ax (LEDの)光軸
θ1 第1屈折角
θ2 第2屈折角
1, 11 Lighting device 2 Housing 21 Mounting surface (one surface of housing)
22 Opening (of housing) 24 Reflector 3 Light source 31 LED
4 Optical member 41, 41a Lens 42 Connection part 43 Incident surface 44 Medium part 45 Output surface 5 Diffusion cover 55 Diffusion layer 56 Diffusion agent 57 High diffusion part 58 Uneven structure 6 Feed part Ax (LED) optical axis θ1 First refraction angle θ2 Second refraction angle
Claims (10)
前記光源部は、複数のLEDを有し、前記複数のLEDは、それぞれの光軸が前記筐体の一面と直交するように配置され、
前記光学部材は、前記複数のLEDの各々に対して設けられた複数のレンズを有し、
前記複数のレンズは、前記LEDを覆い該LEDからの光が入射するドーム状の入射面と、前記入射面から入射した光が伝搬する媒質部と、前記媒質部を伝搬された光が出射する出射面と、を有し、
前記入射面は、前記LEDからの光を前記光軸に対する角度がより大きくなる方向に屈折し、
前記出射面は、前記光軸と前記媒質部を伝搬する光の伝搬方向との成す角度を第1屈折角θ1とし、前記光軸と前記出射面から出射した光の伝搬方向との成す角度を第2屈折角θ2としたときに、θ2/θ1の値が、θ1の増加に伴って一旦増加したのち減少するような形状に構成されていることを特徴とする照明装置。 A lighting device comprising: a flat housing; a light source unit provided on one surface of the housing; and an optical member that controls light distribution of light emitted from the light source unit,
The light source unit includes a plurality of LEDs, and the plurality of LEDs are arranged so that each optical axis is orthogonal to one surface of the casing,
The optical member has a plurality of lenses provided for each of the plurality of LEDs,
The plurality of lenses cover the LED, and have a dome-shaped incident surface on which light from the LED is incident, a medium portion on which light incident from the incident surface propagates, and light propagated through the medium portion is emitted. And an exit surface,
The incident surface refracts light from the LED in a direction in which an angle with respect to the optical axis becomes larger,
The exit surface has an angle formed between the optical axis and the propagation direction of light propagating through the medium portion as a first refraction angle θ1, and an angle formed between the optical axis and the propagation direction of light emitted from the exit surface. An illuminating device characterized in that, when the second refraction angle is θ2, the value of θ2 / θ1 increases once as θ1 increases and then decreases.
前記拡散カバーは、その外面又は内面に光を拡散する拡散層を有することを特徴とする請求項1乃至請求項3のいずれか一項に記載の照明装置。 A diffusion cover for diffusing the light emitted from the optical member;
The lighting device according to any one of claims 1 to 3, wherein the diffusion cover includes a diffusion layer that diffuses light on an outer surface or an inner surface thereof.
前記開口に前記複数のLEDへの給電を制御する給電部が配置されていることを特徴とする請求項1乃至請求項9のいずれか一項に記載の照明装置。 The housing has an opening at the center thereof,
10. The illumination device according to claim 1, wherein a power supply unit that controls power supply to the plurality of LEDs is disposed in the opening. 11.
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JP2017120687A (en) * | 2015-12-28 | 2017-07-06 | 東芝ライテック株式会社 | Luminaire |
JP2017224462A (en) * | 2016-06-15 | 2017-12-21 | 日立アプライアンス株式会社 | Illumination device |
KR101907064B1 (en) | 2017-10-31 | 2018-10-11 | 주식회사 에이치엘옵틱스 | Optical lens |
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JP2014013744A (en) * | 2012-06-08 | 2014-01-23 | Hitachi Appliances Inc | Illumination apparatus |
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2014
- 2014-02-05 JP JP2014019887A patent/JP6300147B2/en active Active
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2015
- 2015-02-03 CN CN201520076155.3U patent/CN204611662U/en not_active Expired - Fee Related
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JP2002270026A (en) * | 2001-03-09 | 2002-09-20 | Asahi Matsushita Electric Works Ltd | Luminaire |
JP2004235103A (en) * | 2003-01-31 | 2004-08-19 | Sumitomo Rubber Ind Ltd | Directly-under type backlight |
JP2010073438A (en) * | 2008-09-17 | 2010-04-02 | Panasonic Corp | Lamp |
JP2011023204A (en) * | 2009-07-15 | 2011-02-03 | Sharp Corp | Light-emitting device, luminous flux control member, and lighting device having light-emitting device |
WO2012049854A1 (en) * | 2010-10-14 | 2012-04-19 | パナソニック株式会社 | Light-emitting device and surface light source device using same |
WO2013094599A1 (en) * | 2011-12-20 | 2013-06-27 | ナルックス株式会社 | Optical element, illumination device including optical element and illumination module using illumination device |
WO2013133147A1 (en) * | 2012-03-09 | 2013-09-12 | 株式会社小糸製作所 | Illuminating apparatus |
JP2014013744A (en) * | 2012-06-08 | 2014-01-23 | Hitachi Appliances Inc | Illumination apparatus |
Cited By (4)
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JP2017120687A (en) * | 2015-12-28 | 2017-07-06 | 東芝ライテック株式会社 | Luminaire |
JP2017224462A (en) * | 2016-06-15 | 2017-12-21 | 日立アプライアンス株式会社 | Illumination device |
KR101907064B1 (en) | 2017-10-31 | 2018-10-11 | 주식회사 에이치엘옵틱스 | Optical lens |
WO2019088457A1 (en) * | 2017-10-31 | 2019-05-09 | 주식회사 에이치엘옵틱스 | Optical lens |
Also Published As
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JP6300147B2 (en) | 2018-03-28 |
CN204611662U (en) | 2015-09-02 |
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