JP6501053B2 - Lighting device - Google Patents

Lighting device Download PDF

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JP6501053B2
JP6501053B2 JP2014113066A JP2014113066A JP6501053B2 JP 6501053 B2 JP6501053 B2 JP 6501053B2 JP 2014113066 A JP2014113066 A JP 2014113066A JP 2014113066 A JP2014113066 A JP 2014113066A JP 6501053 B2 JP6501053 B2 JP 6501053B2
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light
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distribution
reflection area
angle
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JP2015228310A (en
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渉 小椋
渉 小椋
圭一 五味
圭一 五味
照雄 渡邉
照雄 渡邉
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Nichia Corp
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Description

本発明は、拡散部材を通して光を放出する照明装置に関するものである。   The present invention relates to a lighting device that emits light through a diffusing member.

特許文献１には、表示パネルを備える表示装置のバックライトユニットに用いられる発光装置において、被照射体の面方向において輝度が均一となるように、光を被照射体に照射することができ、薄型化が可能な発光装置が記載されている。バックライトユニットは、プリント基板と、プリント基板上に設けられ、基台、ＬＥＤチップ、およびレンズを有する複数の発光部と、発光部の周囲に設けられ、第１反射部分および第２反射部分を有する第１反射部材とを設ける。   In Patent Document 1, in a light emitting device used for a backlight unit of a display device provided with a display panel, light can be irradiated to the irradiated body so that the brightness becomes uniform in the surface direction of the irradiated body, A light emitting device that can be thinned is described. The backlight unit is provided on a printed circuit board, a plurality of light emitting units provided on the printed circuit board, a base, an LED chip, and a lens, and a periphery of the light emitting unit. And a first reflecting member.

特開２０１２−２１６７４７公報JP 2012-216747 A

より薄型で、より均一な照明効果が得られる照明装置が要望されている。   There is a need for a lighting device that is thinner and provides more uniform lighting effects.

本発明の一態様は、発光装置と、発光装置が載置され、反射領域を有する基板と、該基板と対向する拡散部材とを有する照明装置である。発光装置は、反射領域および拡散部材の間に向けて、反射領域に垂直な軸の周りの四方に主発光軸を含む光を出射する４つの出射部であって、反射領域に垂直な方向に対する角度が９０度の水平方向の第１の配光分布と反射領域に垂直な方向に対する角度が５５度の第２の配光分布とを含み、第１の配光分布および第２の配光分布は主発光軸の方向に対して垂直な軸の周りに４５度回転した方向の強度が大きく、反射領域に垂直な方向の強度分布が第１の配光分布と第２の配光分布との間の反射領域に垂直な方向に対する角度が６０度から８５度の範囲の強度分布が拡散部材よりも反射領域に近接した側にピークを含み、主発光軸のピークに対して、垂直な軸の周りに４５度回転した方向のピークの方が大きい光を出射する４つの出射部を有する。 One embodiment of the present invention is a lighting device including a light emitting device, a light emitting device mounted, a substrate having a reflective region, and a diffusion member facing the substrate. The light emitting device is four emitting parts for emitting light including a main light emission axis in four directions around an axis perpendicular to the reflection area , between the reflection area and the diffusion member, with respect to the direction perpendicular to the reflection area A first light distribution and a second light distribution including a first horizontal light distribution at an angle of 90 degrees and a second light distribution at an angle of 55 degrees with respect to the direction perpendicular to the reflection region; The intensity of the direction rotated 45 degrees around the axis perpendicular to the direction of the main light emission axis is large, and the intensity distribution in the direction perpendicular to the reflection area is between the first light distribution and the second light distribution. intensity distribution in the range angle is 85 degrees 60 degrees viewing including the peak on the side close to the reflection region than the diffusion member with respect to the direction perpendicular to the reflective area between, the peak of the main emission axis, vertical axis Yes four emitting portion for emitting direction of the light is larger peak rotated 45 degrees around the That.

この照明装置は、発光装置が、反射領域および拡散部材の間に向けて、少なくとも３つの方向に、強度分布が拡散部材よりも反射領域に近接した側にピークを含む光を出射することにより、発光装置を中心として、反射領域に垂直な方向よりも反射領域に沿った方向（水平な方向）に広がる配光分布が得られる。したがって、複数の基板を規則的に配置したときに複数の発光装置の間に暗点が発生することを抑制でき、より薄型で、より均一な照明効果が得られる照明装置を提供できる。   In this lighting device, the light emitting device emits light having a peak in a direction closer to the reflection region than the diffusion member in at least three directions, between the reflection region and the diffusion member. With the light emitting device as a center, it is possible to obtain a light distribution that extends in a direction (horizontal direction) along the reflection area rather than in a direction perpendicular to the reflection area. Therefore, when a plurality of substrates are regularly arranged, generation of a dark point between a plurality of light emitting devices can be suppressed, and a thinner, more uniform lighting effect can be provided.

照明装置を展開して示す展開斜視図。The expansion | deployment perspective view which expand | deploys and shows an illuminating device. 照明装置を正面から見た様子を示す図。The figure which showed a mode that the lighting apparatus was seen from the front. 光モジュールを示す平面図。The top view which shows an optical module. 光モジュールを示す斜視図。FIG. 2 is a perspective view showing an optical module. 図５（ａ）は光モジュールの水平方向の配光分布、図５（ｂ）は光モジュールの垂直方向の配光分布、図５（ｃ）は単体のＬＥＤの配光角曲線。5 (a) shows the light distribution of the light module in the horizontal direction, FIG. 5 (b) shows the light distribution of the light module in the vertical direction, and FIG. 5 (c) shows the light distribution angle curve of the single LED. 異なる光モジュールを示す斜視図。The perspective view which shows a different light module. さらに異なる光モジュールを示す斜視図。The perspective view which shows a further different light module.

図１に、照明装置を展開して示している。この照明装置１は、上側が開放された薄い箱型のカバー２と、カバー２の下側の面に配置された照明基板１０と、照明基板１０に対向してカバー２の正面側２ｃを覆う拡散部材５とを有する。この例では、カバー２は正方形の照明基板１０が設置された裏面と、四方の側面２ｂとを含む。照明基板１０がカバー２と一体になっていてもよい。カバー２は長方形であってもよく、他の多角形であってもよく、円形、または楕円形であってもよい。カバー２の正面側２ｃおよび裏面側２ａは、相対的な方向であり、照明装置１を天井に取り付けて使う場合は、カバー２の正面側２ｃは下側を向き、壁に取り付けて使う場合は、カバー２の正面側２ｃは側方を向く。   FIG. 1 shows the illumination device in an expanded state. The illumination device 1 covers the front side 2 c of the cover 2 opposite to the illumination substrate 10 and the illumination substrate 10 disposed on the thin box-shaped cover 2 whose upper side is opened, the lower surface of the cover 2. And a diffusion member 5. In this example, the cover 2 includes a back surface on which the square illumination substrate 10 is installed, and a square side surface 2b. The illumination substrate 10 may be integral with the cover 2. The cover 2 may be rectangular, other polygonal, circular or elliptical. The front side 2c and the back side 2a of the cover 2 are relative directions, and when the lighting device 1 is mounted on a ceiling, the front side 2c of the cover 2 faces downward, and when mounted on a wall , The front side 2c of the cover 2 faces sideways.

図２に、照明基板１０が内部に配置されたカバー２を正面から見た様子を示している。照明基板１０の正面側の面（以降では上側の面）１０ａは照明用の光を発する発光面であり、拡散反射性の基板面１０ｂに、複数の光モジュール２０が縦横に並んで配置されている。拡散反射性の基板面１０ｂは、いわゆる艶消しの面であり、光が乱反射するように粗面に加工されていてもよく、白色反射シートなどの拡散反射シートが貼り付けられていてもよい。   FIG. 2 shows a front view of the cover 2 in which the illumination substrate 10 is disposed. The surface 10a on the front side of the illumination substrate 10 (hereinafter referred to as the upper surface) is a light emitting surface that emits light for illumination, and a plurality of optical modules 20 are arranged vertically and horizontally on the diffusely reflective substrate surface 10b. There is. The diffusely reflective substrate surface 10b is a so-called matte surface, and may be roughened to diffusely reflect light, or a diffuse reflective sheet such as a white reflective sheet may be attached.

この照明基板１０の発光面１０ａには、１６個の光モジュール２０が縦横に４×４のマトリクスをなすように配置されている。光モジュール２０の数はこれに限定されず、光モジュール２０が配列される方向はカバー２の側面２ｂに対して直交する方向が好ましいがこれに限られない。または平行する方向に限らず、斜めであってもよい。さらに、カバー２の内側の側面２ｂには拡散反射シートが貼り付けられていることが好ましい。   On the light emitting surface 10a of the illumination substrate 10, 16 light modules 20 are arranged in a matrix of 4 × 4 in the vertical and horizontal directions. The number of optical modules 20 is not limited to this, and the direction in which the optical modules 20 are arranged is preferably, but not limited to, the direction orthogonal to the side surface 2 b of the cover 2. Or it may not only be parallel but be oblique. Furthermore, it is preferable that a diffuse reflection sheet be attached to the inner side surface 2 b of the cover 2.

図３に、光モジュール２０の概略構成を平面図で示し、図４に、光モジュール２０の外観を斜視図により示している。光モジュール２０は、正方形の配線基板２４と、その配線基板２４の上面２４ａの中央に配置された発光装置２５とを含む。発光装置２５は、光を出射する出射部である出射面３１を含む。発光装置２５は、配線基板２４に垂直な軸１９の周りに配置された４つの側面発光型のＬＥＤ３０を含む。４つのＬＥＤ３０は、主発光軸３９が配線基板２４の上面２４ａと平行で、配線基板２４の四隅をそれぞれ向くように組み合わせされている。４つのＬＥＤ３０は、配線基板２４の上面２４ａで９０度ずつ向きを変えて組み合わされており、全体として上面から見ると正方形で全体が直方体状の発光装置２５を構成している。したがって、発光装置２５の４方向の側面２６のそれぞれに、光を放出する出射面３１が設けられており、４方向に光が出射される。   FIG. 3 shows a schematic configuration of the optical module 20 in a plan view, and FIG. 4 shows an appearance of the optical module 20 in a perspective view. The optical module 20 includes a square wiring board 24 and a light emitting device 25 disposed at the center of the upper surface 24 a of the wiring board 24. The light emitting device 25 includes an emission surface 31 which is an emission unit that emits light. The light emitting device 25 includes four side-emitting LEDs 30 arranged around an axis 19 perpendicular to the wiring substrate 24. The four LEDs 30 are combined such that the main light emitting axes 39 are parallel to the upper surface 24 a of the wiring board 24 and face the four corners of the wiring board 24. The four LEDs 30 are combined by changing the direction by 90 degrees on the upper surface 24 a of the wiring substrate 24, and as a whole, a square rectangular light emitting device 25 is formed as a whole when viewed from the upper surface. Therefore, the emission surface 31 which emits light is provided on each of the four side surfaces 26 of the light emitting device 25, and the light is emitted in four directions.

配線基板２４の上面２４ａは反射領域２３を含む。反射領域２３は、出射面３１の前方に少なくとも一部が配置された拡散反射領域２１と、隣り合う拡散反射領域の間に配置された鏡面反射領域２２とを含む。拡散反射領域２１は、各主発光軸３９の方向に、発光装置２５の各側面２６の直下から、各側面２６の幅から各出射面３１の半分程度を除いた幅で、配線基板２４の各隅に向けて延びたほぼ長方形の領域である。拡散反射領域２１の形状は長方形に限定されない。出射面３１の前方に少なくとも一部が配置される形状であればよい。拡散反射領域２１は、さらに配線基板２４の隅に向かって延びており、配線基板２４の隅を含めた領域に配置されていることが望ましい。拡散反射領域２１は、配線基板２４の上面２４ａを艶消しの状態に加工してもよく、白色などの拡散性のシートを貼り付けて形成してもよい。   The upper surface 24 a of the wiring substrate 24 includes a reflective area 23. The reflection area 23 includes a diffuse reflection area 21 in which at least a portion is disposed in front of the emission surface 31, and a specular reflection area 22 disposed between the adjacent diffuse reflection areas. The diffuse reflection area 21 has a width obtained by removing about half of each emission surface 31 from the width of each side surface 26 from immediately below each side surface 26 of the light emitting device 25 in the direction of each main light emission axis 39. It is a generally rectangular area extending towards the corners. The shape of the diffuse reflection area 21 is not limited to a rectangle. It may be a shape in which at least a part is disposed in front of the emission surface 31. The diffuse reflection area 21 further extends toward the corner of the wiring board 24 and is preferably disposed in the area including the corner of the wiring board 24. The diffuse reflection area 21 may be formed by processing the upper surface 24 a of the wiring substrate 24 in a matte state, or may be formed by adhering a diffusive sheet such as white.

拡散反射領域２１の間に配置されている鏡面反射領域２２は、配線基板２４の上面２４ａの中の、四角形の発光装置２５の隅部分の前方直下から配線基板２４の各辺に向かってほぼ三角形に広がる領域であり、本例においては、各出射面３１の前方に半分程度かかる幅で広がっている。鏡面反射領域２２は、光の拡散が少なく、一方からの光が別の一方に反射されて出ていく領域であり、いわゆる、艶ありの領域である。鏡面反射領域２２は、金属などの部材を凹凸がほとんどない状態に加工した領域であってもよく、反射性の高い金属薄膜などの鏡面反射シートを貼り付けて形成された領域であってもよく、配線基板２４自身であって配線基板２４の表面が反射性の高い領域であってもよい。   The specular reflection area 22 disposed between the diffuse reflection areas 21 is substantially triangular in the upper surface 24 a of the wiring board 24 from directly under the front of the corner portion of the square light emitting device 25 toward each side of the wiring board 24. In the present example, the light emission area 31 extends in front of each light emission surface 31 with a width of about half. The specular reflection area 22 is an area where there is little diffusion of light and light from one side is reflected and emitted to another side, and is a so-called area with luster. The specular reflection area 22 may be an area obtained by processing a member such as metal into a state having little unevenness, or may be an area formed by attaching a specular reflection sheet such as a highly reflective metal thin film. The surface of the wiring board 24 may be a highly reflective area which is the wiring board 24 itself.

図５に光モジュール２０の配光特性を示している。図５（ａ）は、水平方向の配光分布を示し、図５（ｂ）は、垂直方向の配光分布を示す。図５（ｃ）は、単体のＬＥＤの配光角曲線を参考に示している。   The light distribution characteristic of the optical module 20 is shown in FIG. FIG. 5 (a) shows the light distribution in the horizontal direction, and FIG. 5 (b) shows the light distribution in the vertical direction. FIG. 5C shows a light distribution angle curve of a single LED as a reference.

図５（ａ）には、図４に示した垂直な軸（法線）１９からの角度（鉛直角）θが９０度の水平方向の配光分布６２と、鉛直角θが５５度の配光分布６１とを示している。なお、主発光軸３９は、垂直な軸１９の周りの水平角φが０度、９０度、１８０度、２７０度の位置である。   In FIG. 5A, the horizontal light distribution distribution 62 with an angle (vertical angle) θ of 90 degrees from the vertical axis (normal line) 19 shown in FIG. 4 and a light distribution with a vertical angle θ of 55 degrees The light distribution 61 is shown. The main light emission axis 39 is located at a horizontal angle φ of 0 degrees, 90 degrees, 180 degrees, and 270 degrees around the vertical axis 19.

図５（ｂ）には、水平角φが４５度の面における垂直方向（鉛直角方向）の光の強度分布（配光分布）６３と、水平角φが０度の面における垂直方向（鉛直角方向）の光の強度分布（配光分布）６４とを示している。また、この配光分布は、４５度の場合のみならず、１３５度、２２５度、３１５度も４５度の場合と同様の配光分布６３を示し、０度の場合のみならず、９０度、１８０度、２７０度も０度の場合と同様の配光分布６４を示す。配光分布６３および６４は、鉛直角θが約７５度にそれぞれピークＰ１およびＰ２を持つ分布となっている。したがって、それぞれのＬＥＤ３０の出射面３１から出射される光の強度分布は、垂直な軸１９の方向に存在する拡散部材５よりも、配線基板２４の上面２４ａの反射領域２３の側に接近した角度にピークＰ１およびＰ２を含む。配光分布６３および６４は、鉛直角θが４５度以上にピークＰ１およびＰ２を含むことが望ましく、６０度以上にピークＰ１およびＰ２を含むことがさらに好ましい。また、配光分布６３および６４のピークＰ１およびＰ２は、反射領域２３から若干離れることが望ましく、配光分布６３および６４は鉛直角θが８５度以下にピークＰ１およびＰ２をそれぞれ含むことが望ましい。   In FIG. 5B, the intensity distribution (light distribution) 63 of light in the vertical direction (vertical angle direction) in the plane with a horizontal angle φ of 45 degrees and the vertical direction (vertical direction in a plane with a horizontal angle φ of 0 degrees) Intensity distribution (light distribution) 64 of the light in the angular direction). Moreover, this light distribution shows not only the case of 45 degrees but also the light distribution 63 similar to the case of 135 degrees, 225 degrees, 315 degrees and 45 degrees, and not only the case of 0 degrees but also 90 degrees, A light distribution 64 similar to the case of 180 degrees and 270 degrees and 0 degrees is shown. The light distribution distributions 63 and 64 are distributions having peaks P1 and P2 at a vertical angle θ of about 75 degrees. Therefore, the intensity distribution of light emitted from the emission surface 31 of each LED 30 is closer to the side of the reflection area 23 of the upper surface 24 a of the wiring substrate 24 than the diffusion member 5 present in the direction of the vertical axis 19 Contains peaks P1 and P2. The light distribution distributions 63 and 64 desirably include the peaks P1 and P2 at a vertical angle θ of 45 degrees or more, and more preferably include the peaks P1 and P2 at 60 degrees or more. Further, it is desirable that the peaks P1 and P2 of the light distributions 63 and 64 be slightly away from the reflection area 23, and it is desirable that the light distributions 63 and 64 include the peaks P1 and P2 when the vertical angle θ is 85 degrees or less. .

光モジュール２０においては、２個のＬＥＤ３０の間、すなわち、２つの出射面３１の間の水平角φが４５度、１３５度、２２５度および３１５度には２個のＬＥＤ３０がそれぞれ主発光軸３９に対し４５度の向きで発光する。図５（ｃ）の個々のＬＥＤ３０の、主発光軸３９の光強度を１００とした配光特性によれば、４５度の配光強度は、もっとも発光強度の高い０度、即ち主発光軸３９の配光強度に対し（１／√２）となる。したがって、水平角φが４５度、１３５度、２２５度および３１５度の強度は、２個のＬＥＤ３０から寄与があるので、√２倍、すなわち、理論的には約１．４倍となる。このため、中間角度に相当する水平角φが４５度の面における鉛直角方向の配光分布６３のピークＰ１の強度は、主発光軸３９の水平角φが０度の面における鉛直角方向の配光分布６４のピークＰ２の強度よりも大きい。言い換えれば、反射領域に垂直な軸の周りの四方に光を出射する４つの出射部を含み、出射部から出射される光のピークに対して、垂直な軸の周りに４５度回転した方向に出力される光のピークの方が大きい。   In the light module 20, two LEDs 30 are respectively main emitting axes 39 when the horizontal angle φ between the two LEDs 30 is 45 degrees, 135 degrees, 225 degrees and 315 degrees. It emits light in the direction of 45 degrees. According to the light distribution characteristic with the light intensity of the main light emission axis 39 of the individual LEDs 30 of FIG. 5C set to 100, the light distribution intensity of 45 degrees is 0 degree, which is the highest light emission intensity, ie, the main light emission axis 39 (1 / √2) for the light distribution intensity of Therefore, the intensities at the horizontal angles φ of 45 degrees, 135 degrees, 225 degrees and 315 degrees have contributions from the two LEDs 30 and therefore become √2 times, that is, theoretically about 1.4 times. For this reason, the intensity of the peak P1 of the light distribution distribution 63 in the vertical angle direction in the plane having a horizontal angle φ of 45 degrees corresponding to the middle angle is the vertical angle direction in the plane where the horizontal angle It is larger than the intensity of the peak P2 of the light distribution 64. In other words, it includes four emitters that emit light in four directions around an axis perpendicular to the reflection area, and is rotated 45 degrees around the axis perpendicular to the peak of light emitted from the emitters. The peak of the light output is larger.

本例の光モジュール２０は、鉛直角θでみると、拡散部材５よりも、ＬＥＤ３０が搭載された配線基板２４の上面２４ａの反射領域２３の側にピークＰ１およびＰ２がある配光特性を持つ。このため、光モジュール２０から出力される光は、拡散部材５に直に向かう強度よりも、拡散部材５に対し平行に近い角度、すなわち、反射領域２３に対し平行に近い角度に傾いた強度の方が強い。さらに、この光モジュール２０の垂直な軸１９の周りの配光特性も、円形ではなく、隣接する光源への距離が大きくなる格子状配置の対角線方向に強い強度を持つ。光モジュール２０は、鉛直角θが９０度以下の方向の配光特性を円形から対角線方向に強い分布を持つ特性に変更でき、対角線方向の暗点の解消に効果的である。   The optical module 20 of this example has a light distribution characteristic in which peaks P1 and P2 are on the side of the reflection area 23 of the upper surface 24a of the wiring substrate 24 on which the LED 30 is mounted, as viewed from the vertical angle θ. . For this reason, the light output from the optical module 20 has an intensity inclined at an angle closer to parallel to the diffusion member 5, that is, an angle closer to parallel to the reflection area 23, than the intensity directed to the diffusion member 5 directly. It is stronger. Furthermore, the light distribution characteristic around the vertical axis 19 of the light module 20 is also not circular, but has a strong intensity in the diagonal direction of the grid arrangement where the distance to the adjacent light source becomes large. The optical module 20 can change the light distribution characteristic in the direction in which the vertical angle θ is 90 degrees or less from a circle to a characteristic having a strong distribution in the diagonal direction, and is effective in eliminating dark spots in the diagonal direction.

特に、光モジュール２０においては、拡散反射領域２１と対角方向に配置された鏡面反射領域２２とを組み合わせることにより、水平角φが０度、９０度、１８０度、２７０度の主発光軸３９に対する、水平角φが４５度、１３５度、２２５度、３１５度の中間角度（対角方向）の光の強度比が、図５（ａ）に示すように高い。たとえば、鉛直角θが９０度の方向では、主発光軸３９に対する中間角度方向の光の強度の比は１．４であり、理論的な値とほぼ同じになる。この光モジュール２０により得られる鉛直角θが９０度の方向の光の強度比は、１．３以上であることが望ましく、最大で１．５程度までである。   In particular, in the optical module 20, by combining the diffuse reflection area 21 and the specular reflection area 22 disposed in the diagonal direction, the main light emission axes 39 of horizontal angles φ of 0 degrees, 90 degrees, 180 degrees, and 270 degrees. The intensity ratio of light at an intermediate angle (diagonal direction) at a horizontal angle φ of 45 degrees, 135 degrees, 225 degrees, and 315 degrees to the above is high as shown in FIG. For example, in the direction in which the vertical angle θ is 90 degrees, the ratio of the light intensity in the intermediate angular direction to the main light emission axis 39 is 1.4, which is almost the same as the theoretical value. The light intensity ratio in the direction of 90 degrees obtained by the optical module 20 is preferably 1.3 or more, and is up to about 1.5.

すなわち、光モジュール２０の配線基板２４の上面（反射領域）２４ａが拡散面のみで構成された場合、そのような光モジュールの対角線方向に強い配光特性は鉛直角９０度、即ち上面２４ａに平行な面内近傍に限られている。このため、対角線方向に隣り合う光モジュール２０との中点上（対角中点）の拡散部材５に向かう鉛直角の配光分布はほぼ円形に近づく。このため、単に４つのＬＥＤ３０を組み合わせて、対角線方向の分布を強くしても対角中点の暗点解消は十分には達成できない。   That is, when the upper surface (reflection area) 24a of the wiring substrate 24 of the optical module 20 is constituted only by the diffusion surface, the light distribution characteristic strong in the diagonal direction of such an optical module is 90 degrees vertical angle, ie parallel to the upper surface 24a. It is limited to the in-plane vicinity. Therefore, the light distribution of the vertical angle toward the diffusion member 5 on the middle point (diagonal middle point) with the light modules 20 adjacent in the diagonal direction approaches a substantially circular shape. Therefore, even if the distribution in the diagonal direction is increased simply by combining the four LEDs 30, it is not possible to sufficiently achieve the dark point elimination of the diagonal midpoint.

本例の光モジュール２０においては、配線基板２４の上面２４ａに拡散反射領域２１と鏡面反射領域２２とを配置している。このため、図５（ａ）に示すように、鉛直角５５度の配光分布６２も中間角度（対角線方向）の相対的な強度が高く、ピークＰ１およびＰ２の付近である鉛直角７５度では、主発光軸３９に対する中間角度方向の光強度の比が１．３程度と理論値に近い高い値を示す。したがって、光モジュール２０は、拡散部材５に向かう鉛直方向の分布を主発光軸３９の強度に対し、中間角度の方向の強度が１．２倍前後にアップする配光分布を持たせることができる。   In the optical module 20 of this example, the diffuse reflection area 21 and the specular reflection area 22 are disposed on the upper surface 24 a of the wiring substrate 24. Therefore, as shown in FIG. 5A, the light intensity distribution 62 with a vertical angle of 55 degrees also has a high relative intensity at the middle angle (diagonal direction), and at a vertical angle of 75 degrees that is near peaks P1 and P2 The ratio of the light intensity in the middle angular direction to the main light emission axis 39 exhibits a high value close to the theoretical value of about 1.3. Therefore, the optical module 20 can have a light distribution distribution in which the intensity in the direction of the intermediate angle is increased by about 1.2 times the intensity of the main light emission axis 39 with respect to the intensity distribution in the vertical direction toward the diffusion member 5 .

さらに、図５（ｂ）に示すように、主発光軸３９および中間角度方向の鉛直方向の配光分布は、鉛直角θが７５度付近にピークを持つバットウィング形状の分布となり、水平角φの方向の配光分布と相まって、発光面１０ａに複数の光モジュール２０を正方格子状に配置したときに暗点が発生しにくい照明装置１を提供できる。たとえば、光モジュール２０の間の距離（ある光モジュールの中心と、その光モジュールに隣り合う最短の光モジュールの中心との距離）Ｗに対し、発光面１０ａと拡散部材５の内面との距離がＷ／２の照明装置１であっても、対角線方向の暗点がほぼ見えないことが確認されている。   Furthermore, as shown in FIG. 5B, the light distribution distribution in the vertical direction of the main light emission axis 39 and the middle angle direction is a batwing shape having a peak at a vertical angle θ of around 75 degrees, and a horizontal angle φ In combination with the light distribution in the direction of 1, it is possible to provide the lighting device 1 in which a dark point is less likely to occur when the plurality of light modules 20 are arranged in the square lattice shape on the light emitting surface 10a. For example, the distance between the light emitting surface 10 a and the inner surface of the diffusion member 5 is in relation to the distance W between the optical modules 20 (the distance between the center of a certain optical module and the center of the shortest optical module adjacent to the optical module) W It has been confirmed that even in the illumination device 1 of W / 2, the dark spots in the diagonal direction can hardly be seen.

図６に、光モジュール２０の異なる例を示している。この光モジュール２０は、正方形の配線基板２４と、その配線基板２４の上面２４ａの中央に配置された発光装置２５とを含む。発光装置２５は、側面に出射面３１が設けられた４つの側面発光型のＬＥＤ３０を出射面３１が四方をそれぞれ向くように組み合わせた構成である。配線基板２４の上面２４ａは反射領域２３を含む。反射領域２３は、出射面３１の前方に配置された拡散反射領域２１と、隣り合う拡散反射領域の間に配置された鏡面反射領域２２とを含む。拡散反射領域２１は、出射面３１の直下が狭く、配線基板２４のコーナー（４つの隅部）に向かって広がっている。拡散反射領域２１の間に配置されている鏡面反射領域２２は、発光装置２５のコーナー部分の前方直下から配線基板２４の各辺に向かって帯状に延びている。   A different example of the optical module 20 is shown in FIG. The optical module 20 includes a square wiring board 24 and a light emitting device 25 disposed at the center of the upper surface 24 a of the wiring board 24. The light emitting device 25 has a configuration in which four side surface light emitting type LEDs 30 provided with light emitting surfaces 31 on the side surfaces are combined such that the light emitting surfaces 31 face in four directions. The upper surface 24 a of the wiring substrate 24 includes a reflective area 23. The reflection area 23 includes a diffuse reflection area 21 disposed in front of the emission surface 31 and a specular reflection area 22 disposed between the adjacent diffuse reflection areas. The diffuse reflection area 21 is narrow immediately below the emission surface 31 and spreads toward the corners (four corners) of the wiring board 24. The specular reflection area 22 disposed between the diffuse reflection areas 21 extends in a band shape from immediately below the front of the corner portion of the light emitting device 25 toward each side of the wiring board 24.

この光モジュール２０においても、図５（ａ）および図５（ｂ）に示した配光分布と同様の配光分布が得られる。鏡面反射領域２２は、対角線方向（主発光軸３９同士の中間方向）の９０度以下の鉛直角方向に強い配光分布を得るために重要であるが、対角線方向に設けられていればよく、鏡面反射領域２２の形状、大きさの許容範囲は広い。   Also in this optical module 20, a light distribution similar to the light distribution shown in FIGS. 5 (a) and 5 (b) can be obtained. The specular reflection area 22 is important for obtaining a strong light distribution in the vertical angle direction of 90 degrees or less in the diagonal direction (the middle direction of the main light emission axes 39), but it may be provided in the diagonal direction, The allowable range of the shape and size of the specular reflection area 22 is wide.

拡散反射領域２１は、光モジュール２０の直上、すなわち、鉛直角θが０度方向の配光分布を得るために重要である。拡散反射領域２１は、発光装置（ＬＥＤパッケージ）２５の側面２６に設けられた出射面３１の直前と配線基板２４の上面２４ａの鏡面反射領域２２との間に適当な幅設けられていることが重要である。   The diffuse reflection area 21 is important for obtaining a light distribution directly above the light module 20, that is, when the vertical angle θ is in the 0 degree direction. The diffuse reflection area 21 is provided with an appropriate width between immediately before the emission surface 31 provided on the side surface 26 of the light emitting device (LED package) 25 and the specular reflection area 22 on the upper surface 24 a of the wiring substrate 24. is important.

図７に、光モジュール２０のさらに異なる例を示す。この光モジュール２０は、配線基板２４と、配線基板２４の中央に取り付けられたＬＥＤ３０と、配線基板２４の上面２４ａに取り付けられる反射板２９と、反射板２９の中央の開口２９ａを介して露出するＬＥＤ３０を覆うカバー２８とを含む。ＬＥＤ３０は、鉛直方向に主発光軸を持つように配線基板２４に取り付けられている。カバー２８は、水平角φが０度、９０度、１８０度、２７０度にそれぞれ開いた窓（開口）２８ａを含む。発光装置２５は、ＬＥＤ３０とカバー２８とを含み、窓２８ａを出射面３１とし、水平角φが０度、９０度、１８０度、２７０度を主発光軸３９として光が出力される。   A further different example of the optical module 20 is shown in FIG. The optical module 20 is exposed through the wiring board 24, the LED 30 attached to the center of the wiring board 24, the reflecting plate 29 attached to the upper surface 24 a of the wiring board 24, and the opening 29 a in the center of the reflecting plate 29. And a cover 28 covering the LED 30. The LED 30 is attached to the wiring board 24 so as to have a main light emission axis in the vertical direction. The cover 28 includes windows (openings) 28 a opened at horizontal angles φ of 0 degrees, 90 degrees, 180 degrees, and 270 degrees, respectively. The light emitting device 25 includes the LED 30 and the cover 28, and the light is output with the window 28 a as the emitting surface 31 and the horizontal angle φ as the main light emitting axis 39 with 0 degree, 90 degrees, 180 degrees, and 270 degrees.

反射板２９は、出射面３１である窓２８ａの前面に一部がかかるように配置された拡散反射領域２１と、隣り合う拡散反射領域２１の間に配置された鏡面反射領域２２とを含む。この光モジュール２０も、図５（ａ）および（ｂ）に示した配光特性に準じた配光特性を持つ。   The reflection plate 29 includes a diffuse reflection area 21 disposed so as to partially cover the front surface of the window 28a which is the light emission surface 31, and a specular reflection area 22 disposed between the adjacent diffuse reflection areas 21. The optical module 20 also has a light distribution characteristic according to the light distribution characteristic shown in FIGS. 5 (a) and 5 (b).

以上に説明したように、照明装置１は、被照射面の面積に見合う数だけ拡散反射シートで覆われた発光面１０ａの上に格子状に複数の光モジュール２０を配列し、被照射面に拡散部材５を配置している。照明装置１は、表示装置のバックライトとして利用でき、拡散部材５に重ねて表示パネルを配置してもよく、拡散部材５の代わりに表示パネルを配置してもよい。また、照明装置１は、天井、壁などに設置するベースライト等に使用できる。   As described above, the lighting device 1 arranges the plurality of light modules 20 in a grid shape on the light emitting surface 10a covered with the diffuse reflection sheet by the number corresponding to the area of the light receiving surface, and The diffusion member 5 is disposed. The illumination device 1 can be used as a backlight of a display device, and the display panel may be disposed so as to overlap the diffusion member 5 or may be disposed instead of the diffusion member 5. Moreover, the illuminating device 1 can be used for the base light etc. which are installed in a ceiling, a wall, etc.

また、上記の光モジュール２０に含まれる発光装置２５は、方形または矩形の箱型であり、４つの側面２６と、それぞれの側面２６に設けられた出射面３１とを含む。発光装置２５は、３つの側面２６を持つものであってもよく、３方向に向いた出射面３１を備えていてもよい。また、側面２６は円筒状であってもよく、少なくとも３方向に向いた出射面３１を備えていればよい。さらに、発光装置２５は、５角形以上の多角形で、５方向以上に向いた出射面３１を備えていてもよい。   The light emitting device 25 included in the above-described light module 20 is a rectangular or rectangular box, and includes four side surfaces 26 and an emitting surface 31 provided on each side surface 26. The light emitting device 25 may have three side surfaces 26 and may have an emitting surface 31 oriented in three directions. Further, the side surface 26 may be cylindrical, as long as it has an emission surface 31 oriented in at least three directions. Furthermore, the light emitting device 25 may be a pentagon or more polygon, and may include an emission surface 31 facing in five or more directions.

１ 照明装置、 １０ 照明基板、 １０ａ 発光面
２０ 光モジュール
２１ 拡散反射領域、 ２２ 鏡面反射領域、 ２３ 反射領域
５ 拡散部材 Reference Signs List 1 illumination device, 10 illumination substrate, 10a light emitting surface 20 light module 21 diffuse reflection area, 22 specular reflection area, 23 reflection area 5 diffusion member

Claims (2)

発光装置と、
前記発光装置が載置され、反射領域を有する基板と、
該基板と対向する拡散部材とを有する照明装置であって、
前記発光装置は、前記反射領域および前記拡散部材の間に向けて、前記反射領域に垂直な軸の周りの四方に主発光軸を含む光を出射する４つの出射部であって、前記反射領域に垂直な方向に対する角度が９０度の水平方向の第１の配光分布と前記反射領域に垂直な方向に対する角度が５５度の第２の配光分布とを含み、前記第１の配光分布および前記第２の配光分布は前記主発光軸の方向に対して前記垂直な軸の周りに４５度回転した方向の強度が大きく、前記反射領域に垂直な方向の強度分布が前記第１の配光分布と前記第２の配光分布との間の前記反射領域に垂直な方向に対する角度が６０度から８５度の範囲の前記拡散部材よりも前記反射領域に近接した側にピークを含み、前記主発光軸の前記ピークに対して、前記垂直な軸の周りに４５度回転した方向の前記ピークの方が大きい光を出射する４つの出射部を有する照明装置。 A light emitting device,
A substrate on which the light emitting device is mounted and having a reflective area;
An illumination device comprising the substrate and a diffusion member facing the substrate, the illumination device comprising:
The light emitting device is four emitting units for emitting light including a main light emission axis in four directions around an axis perpendicular to the reflection area , between the reflection area and the diffusion member , the reflection area The first light distribution distribution in the horizontal direction at an angle of 90 degrees with respect to the direction perpendicular to the light source and the second light distribution distribution at an angle of 55 degrees with respect to the direction perpendicular to the reflection region; The second light distribution has a large intensity in the direction rotated 45 degrees around the vertical axis with respect to the direction of the main light emission axis, and the intensity distribution in the direction perpendicular to the reflection region is the first look including the diffusion peak on the side close to the reflection region than members ranging angle of 85 degrees from 60 degrees with respect to a direction perpendicular to the reflection region between the light distribution and the second light distribution , Around the axis perpendicular to the peak of the main emission axis Lighting apparatus having four emitting portion for emitting 5 degrees rotated direction of light is larger of the peak. 請求項１において、
規則的に配置された複数の前記基板を含む、照明装置。 In claim 1,
A lighting device comprising a plurality of the substrates regularly arranged.
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