JP2012174625A - Lighting system - Google Patents

Lighting system Download PDF

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JP2012174625A
JP2012174625A JP2011037857A JP2011037857A JP2012174625A JP 2012174625 A JP2012174625 A JP 2012174625A JP 2011037857 A JP2011037857 A JP 2011037857A JP 2011037857 A JP2011037857 A JP 2011037857A JP 2012174625 A JP2012174625 A JP 2012174625A
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light emitting
support
emitting unit
light
lighting device
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JP5675423B2 (en
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Atsushi Shiraishi
篤 白石
Hiroshi Tsukada
浩 塚田
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Citizen Holdings Co Ltd
Citizen Electronics Co Ltd
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Citizen Holdings Co Ltd
Citizen Electronics Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To solve a problem that, in a lighting system, a lens is used in order to obtain planar and uniform light distribution, while reducing the number of LED elements, however, in this case, loss of light is generated and a supporting structure of the lens becomes complicated.SOLUTION: The planar lighting system 10 having a substrate 16 and a scattering plate 14 is provided with a light-emitting unit 11 arranged on the substrate 16. The light-emitting unit 11 includes a support body 12 having a plurality of slant faces on the scattering plate 14 side and LED elements 15 are installed on the slanted face of the support body 12. Thereby, the lighting system 10 can have a structure in which planar and almost uniform light distribution is obtained yet, loss of light is reduced.

Description

本発明は、基板と拡散板の間に複数のＬＥＤ素子を備える面状の照明装置に関する。   The present invention relates to a planar lighting device including a plurality of LED elements between a substrate and a diffusion plate.

面状の照明装置として底部に基板を備え、その基板に多数のＬＥＤ素子を配置し、基板上部に拡散板を設けたものが知られている（例えば特許文献１の図６）。特許文献１は、長寿命、均一な輝度、大光束の面発光光源（面状の照明装置）を得るため、ＬＥＤ素子を配置した熱伝導板（基板）の一端にヒートシンクを熱伝導可能な状態で接続することを骨子としている。このなかで図６に面発光光源としての構造が示されている。この面発光光源は、熱伝導板１上にＬＥＤ素子１５を一列に配置し、ヒートシンク２を接続したユニットを含み、そのユニットを複数並べ上部に拡散透過層（拡散板）を備えている。   As a planar lighting device, a substrate having a substrate at the bottom, a large number of LED elements arranged on the substrate, and a diffusion plate provided on the substrate is known (for example, FIG. 6 of Patent Document 1). Patent Document 1 discloses a state in which a heat sink can be thermally conducted to one end of a heat conduction plate (substrate) on which LED elements are arranged in order to obtain a surface-emitting light source (planar illumination device) having a long life, uniform brightness, and a large luminous flux. The main point is to connect with. Among these, FIG. 6 shows a structure as a surface emitting light source. This surface-emitting light source includes a unit in which LED elements 15 are arranged in a row on a heat conducting plate 1 and a heat sink 2 is connected, and a plurality of such units are arranged and a diffusion transmission layer (diffusion plate) is provided on the upper part.

特許文献１のような照明装置は、単体のＬＥＤ素子が偏った配光特性を持つため、多数のＬＥＤ素子を配列し、ある程度均一な配光分布にしたうえでさらに拡散板を使って均一な配光分布を得ている。ところがＬＥＤ素子数を多くすると、実装手番が増えたり、電力供給用の配線が多くなったりする。   Since the lighting device as in Patent Document 1 has a light distribution characteristic in which a single LED element is biased, a large number of LED elements are arranged to obtain a uniform light distribution distribution, and then a uniform diffusion plate is used. A light distribution is obtained. However, when the number of LED elements is increased, the number of mounting steps increases, and the power supply wiring increases.

これに対し、良好な配向分布を維持しながらＬＥＤ素子数を低減させるため各ＬＥＤ素子にレンズをとりつける方法が知られている（例えば特許文献２の図２）。特許文献２は、ＬＥＤ素子の発光色のバラツキを目立ちにくくし輝度ムラの発生を防止することを目的とし、中央が窪んだ光束制御部材（レンズ）を使い、ＬＥＤ発光素子（ＬＥＤ素子）から出射した光束を均一な分布とするための光制御出射面の条件を提示している。特許文献２の図２には、光拡散部材７（拡散板）を介して被照明部材（液晶表示パネル）３を照明する面光源装置２（面状の照明装置）が光束分布とともに示されている。このとき光束制御部材５で取り囲まれた発光素子４からなる発光装置２９はピッチｐで配列している。   On the other hand, a method of attaching a lens to each LED element is known in order to reduce the number of LED elements while maintaining a good orientation distribution (for example, FIG. 2 of Patent Document 2). Patent Document 2 aims at preventing variations in the emission color of LED elements from becoming noticeable and preventing uneven brightness, and using a light beam control member (lens) with a depressed center to emit light from the LED light emitting element (LED element). The condition of the light control exit surface for making the light flux uniform distribution is presented. FIG. 2 of Patent Document 2 shows a surface light source device 2 (planar illumination device) that illuminates an illuminated member (liquid crystal display panel) 3 through a light diffusion member 7 (diffusion plate) together with a light flux distribution. Yes. At this time, the light emitting devices 29 including the light emitting elements 4 surrounded by the light flux controlling member 5 are arranged at a pitch p.

特開２０００−３０５２１号公報 （図６）JP 2000-30521 A (FIG. 6) 特開２００６−９２９８３号公報 （図２）JP 2006-92983 A (FIG. 2)

特許文献２に示したような方式、すなわち配光分布を改善させるため各ＬＥＤ素子にレンズを設ける方式では、ＬＥＤ素子から出射した光が空気中を伝搬し、その後レンズに入射し最後にレンズから出射する。この場合、レンズの界面や内部における反射吸収によって光損失が起きる。また配光分布を良くしようとしてレンズ形状を複雑化すると、ＬＥＤ素子とレンズの位置関係に係わる条件が厳しくなり、多少ずれただけでも効率が極端に低下する。このためＬＥＤ素子とレンズの位置関係を精度良く設定できるレンズ保持構造が必要になる。   In a method as shown in Patent Document 2, that is, a method in which a lens is provided in each LED element in order to improve the light distribution, light emitted from the LED element propagates in the air, then enters the lens, and finally from the lens. Exit. In this case, light loss occurs due to reflection absorption at the interface and inside of the lens. Further, when the lens shape is complicated in order to improve the light distribution, the conditions relating to the positional relationship between the LED element and the lens become severe, and the efficiency is extremely lowered even if it is slightly deviated. For this reason, a lens holding structure capable of accurately setting the positional relationship between the LED element and the lens is required.

そこで本発明は、上記課題に鑑みてなされたものであり、平面的に均一な配光分布を持っていても、ＬＥＤ素子から出射した光の損失が少なく、構造が簡単な面状の照明装置を提供することを目的とする。   Accordingly, the present invention has been made in view of the above problems, and even if it has a flat and uniform light distribution, a planar illumination device that has a simple structure with little loss of light emitted from the LED element. The purpose is to provide.

上記課題を解決するため本発明は、基板と散乱板の間に複数のＬＥＤ素子を備える面状
の照明装置において、発光ユニットを備え、該発光ユニットが前記基板上に配置され、前記発光ユニットが前記基板側に底面、前記散乱板側に複数の斜面を有する支持体を含み、該支持体の斜面に前記ＬＥＤ素子が取り付けられていることを特徴とする。 In order to solve the above-described problems, the present invention provides a planar illumination device including a plurality of LED elements between a substrate and a scattering plate, and includes a light-emitting unit, the light-emitting unit is disposed on the substrate, and the light-emitting unit is the substrate. It includes a support having a bottom surface on the side and a plurality of inclined surfaces on the scattering plate side, and the LED element is attached to the inclined surface of the support.

前記支持体は多角錐であっても良い。   The support may be a polygonal pyramid.

前記支持体の頂部が平坦であっても良い。   The top of the support may be flat.

前記発光ユニットに含まれる前記支持体の底面が偶数の頂点をもつ多角形であり、前記発光ユニットからなる配列において最小単位として４個の前記発光ユニットからなる長方形の区画が選べるとき、該区画において隣接する一方の前記発光ユニットに含まれる前記支持体の底面の一辺と、他方の前記発光ユニットに含まれる前記支持体の底面の頂点とが対向することが好ましい。   When the bottom surface of the support included in the light emitting unit is a polygon having an even number of vertices, and a rectangular section composed of four light emitting units can be selected as a minimum unit in the array composed of the light emitting units, It is preferable that one side of the bottom surface of the support body included in one of the adjacent light emitting units is opposed to the vertex of the bottom surface of the support body included in the other light emitting unit.

前記発光ユニットに含まれる前記支持体の底面が奇数の頂点をもつ多角形であり、前記発光ユニットからなる配列において最小単位として４個の前記発光ユニットからなる長方形の区画が選べるとき、該区画において隣接する一方の発光ユニットに含まれる前記支持体の底面の一辺と、他方の発光ユニットに含まれる前記支持体の底面の頂点が対向する発光ユニットの組が２個あり、各組の前記頂点の向く方向が反対であることが好ましい。   When the bottom surface of the support included in the light emitting unit is a polygon having an odd number of vertices, and a rectangular section composed of four light emitting units can be selected as a minimum unit in the array composed of the light emitting units, There are two sets of light emitting units in which one side of the bottom surface of the support included in one adjacent light emitting unit and the top of the bottom surface of the support included in the other light emitting unit face each other. The facing direction is preferably opposite.

前記支持体は三角柱であり、その側面の一つが底面となっても良い。   The support may be a triangular prism, and one of its side surfaces may be a bottom surface.

前記支持体の頂部が平坦であっても良い。   The top of the support may be flat.

前記発光ユニットに含まれる前記支持体が三角柱であるとき、該支持体の一方の斜面に配置されるＬＥＤ素子と他方の斜面に配置されるＬＥＤ素子が、該支持体の長手方向で異なった位置にあることが好ましい。   When the support included in the light emitting unit is a triangular prism, the LED elements disposed on one slope of the support and the LED elements disposed on the other slope are different in the longitudinal direction of the support. It is preferable that it exists in.

本発明の照明装置は基板上に複数の発光ユニットが配列し、それぞれの発光ユニットに含まれる支持体の斜面にＬＥＤ素子を配置しているため、光束が平面的に広がり、拡散板によって配向分布が均一化される。このときＬＥＤ素子から出射した光は空気中を伝搬して拡散板に到達するだけなので無用な反射吸収がなく光の損失が少ない。さらに本発明の照明装置は、ＬＥＤ素子と拡散板との間にレンズのような設置位置に係わる条件の厳しい光学部品がないため構造が簡単になる。   In the illuminating device of the present invention, a plurality of light emitting units are arranged on a substrate, and LED elements are arranged on the slope of a support included in each light emitting unit. Is made uniform. At this time, since the light emitted from the LED element only propagates in the air and reaches the diffusion plate, there is no unnecessary reflection absorption and there is little light loss. Furthermore, the illumination device of the present invention has a simple structure because there is no strict optical component related to the installation position such as a lens between the LED element and the diffusion plate.

以上のように本発明の照明装置は、平面的に略均一な配光分布を待っていても、ＬＥＤ素子から出射した光の損失が少なく、構造も簡単である。   As described above, the lighting device of the present invention has a small loss of light emitted from the LED elements and a simple structure even when waiting for a substantially uniform light distribution in a plane.

本発明の第１実施形態における照明装置の断面図。Sectional drawing of the illuminating device in 1st Embodiment of this invention. 図１の照明装置に含まれる発光ユニットの平面図及び正面図。FIG. 2 is a plan view and a front view of a light emitting unit included in the lighting device of FIG. 1. 図１の照明装置に含まれる発光ユニットの配列の説明図。Explanatory drawing of the arrangement | sequence of the light emission unit contained in the illuminating device of FIG. 本発明の第２実施形態における発光ユニットの平面図及び正面図。The top view and front view of the light emission unit in 2nd Embodiment of this invention. 本発明の第２実施形態における発光ユニットの配列の説明図。Explanatory drawing of the arrangement | sequence of the light emission unit in 2nd Embodiment of this invention. 本発明の第３実施形態における発光ユニットの平面図と側面図。The top view and side view of the light emission unit in 3rd Embodiment of this invention. 本発明の第３実施形態における発光ユニットの配列の説明図。Explanatory drawing of the arrangement | sequence of the light emission unit in 3rd Embodiment of this invention. 本発明の第４実施形態における発光ユニットの平面図と正面図。The top view and front view of the light emission unit in 4th Embodiment of this invention. 本発明の第５実施形態における発光ユニットの平面図。The top view of the light emission unit in 5th Embodiment of this invention.

以下、添付図１〜９を参照しながら本発明の好適な実施形態について詳細に説明する。なお図面の説明において、同一または相当要素には同一の符号を付し、重複する説明は省略する。また説明のため部材の縮尺は適宜変更している。さらに特許請求の範囲に記載した発明特定事項との関係をカッコ内に記載している。
（第１実施形態） Hereinafter, preferred embodiments of the present invention will be described in detail with reference to FIGS. In the description of the drawings, the same or equivalent elements will be denoted by the same reference numerals, and redundant description will be omitted. For the sake of explanation, the scale of the members is changed as appropriate. Furthermore, the relationship with the invention specific matter described in the claims is described in parentheses.
(First embodiment)

添付図１〜３を参照して本発明の第１実施形態を詳細に説明する。図１は本実施形態における照明装置１０の断面図である。基板１６上には発光ユニット１１が配列している。発光ユニット１１は、断面が三角形の支持体１２と断面が長方形のＬＥＤ素子１５を備えている。支持体１２のそれぞれの斜辺にはＬＥＤ素子１５が配置されている。発光ユニット１１の上部には拡散板１４が配置され、収納部材１７により基板１６と拡散板１４が収納されている。   A first embodiment of the present invention will be described in detail with reference to FIGS. FIG. 1 is a cross-sectional view of a lighting device 10 according to this embodiment. The light emitting units 11 are arranged on the substrate 16. The light emitting unit 11 includes a support 12 having a triangular cross section and an LED element 15 having a rectangular cross section. LED elements 15 are arranged on the oblique sides of the support 12. A diffusion plate 14 is disposed on the top of the light emitting unit 11, and the substrate 16 and the diffusion plate 14 are stored by the storage member 17.

図２により図１の照明装置１０に含まれる発光ユニット１１を説明する。図２は発光ユニット１１の平面図（ａ）及び正面図（ｂ）である。支持体１２は正四角錐であり、底面が基板１６（図１参照）に接続する。支持体１２の各斜面にそれぞれ２個、合計８個のＬＥＤ素子１５が配置されている。各斜面に配置したＬＥＤ素子１５の組は、ＬＥＤ素子１５の使用効率を向上させるため（無駄を出さないため）、平均値が所望の輝度・色度範囲に入るよう調整されている。なお支持体１２の斜面にＬＥＤ素子１５が配置されているので、ＬＥＤ素子１５の上面とともに、（ａ）では上側の側面、（ｂ）では下側の側面がみえる。   The light emitting unit 11 included in the illumination device 10 of FIG. 1 will be described with reference to FIG. FIG. 2 is a plan view (a) and a front view (b) of the light emitting unit 11. The support 12 is a regular quadrangular pyramid, and the bottom surface is connected to the substrate 16 (see FIG. 1). A total of eight LED elements 15 are disposed on each inclined surface of the support 12. The group of LED elements 15 arranged on each slope is adjusted so that the average value falls within a desired luminance / chromaticity range in order to improve the use efficiency of the LED elements 15 (to avoid waste). Since the LED element 15 is disposed on the slope of the support 12, the upper side surface can be seen in (a) and the lower side surface can be seen in (b) along with the upper surface of the LED element 15.

図３により図１の照明装置１０に含まれる発光ユニット１１の配列及び配光分布を説明する。図３は、発光ユニット１１の配列の説明図であり、多数の発光ユニット１１からなる配列のうち４個の隣接しあう発光ユニット１１で構成された区画を上方から眺めたものである。図中、発光ユニット１１の配光分布１３を点線で示している。配光分布１３は輝度若しくは光束密度を等高線で表した場合の代表的な等高線（例えば最大値の１／２）に相当し、各ＬＥＤ素子１５が上面方向を中心とした比較的強い指向性を持っていることを示している。   The arrangement and light distribution of the light emitting units 11 included in the illumination device 10 of FIG. 1 will be described with reference to FIG. FIG. 3 is an explanatory diagram of the arrangement of the light-emitting units 11, and shows a section composed of four adjacent light-emitting units 11 in the arrangement made up of a large number of light-emitting units 11 as viewed from above. In the figure, the light distribution 13 of the light emitting unit 11 is indicated by a dotted line. The light distribution 13 corresponds to a representative contour line (for example, 1/2 of the maximum value) when the luminance or luminous flux density is represented by contour lines, and each LED element 15 has a relatively strong directivity centering on the upper surface direction. It shows that you have.

発光ユニット１１に含まれる支持体１２は正四角錐なので底面が正方形で４個の頂点をもつ。本実施形態では多数の発光ユニット１１からなる配列から４個の発光ユニット１１が隣接し合うようにして構成した長方形の区画を選べる。この区画では隣接する一方の発光ユニット１１に含まれる支持体１２の底面の一辺と、他方の発光ユニット１１に含まれる支持体１２の底面の頂点が対向している。   Since the support 12 included in the light emitting unit 11 is a regular quadrangular pyramid, the bottom surface is square and has four vertices. In the present embodiment, a rectangular section configured such that four light emitting units 11 are adjacent to each other can be selected from an array of a large number of light emitting units 11. In this section, one side of the bottom surface of the support 12 included in one adjacent light emitting unit 11 and the top of the bottom surface of the support 12 included in the other light emitting unit 11 face each other.

このようにすると配光分布１３が重ならず均一に広がるようになり好ましい。本実施形態では支持体１２の底面を正方形としているが、底面は正方形に限られず長方形、平行四辺形、若しくは偶数の頂点をもつ多角形であっても良い。この場合でも、隣接する一方の発光ユニットに含まれる支持体の底面の一辺と、他方の発光ユニットに含まれる支持体の底面の頂点とを対向させると良い。このようにすると隣接する発光ユニットの底面の頂点若しくは辺が対向しあう場合に比べ配光分布が重ならなくなり、よりいっそう均一になる。   This is preferable because the light distribution 13 spreads uniformly without overlapping. In the present embodiment, the bottom surface of the support 12 is square, but the bottom surface is not limited to a square, and may be a rectangle, a parallelogram, or a polygon having an even number of vertices. Even in this case, it is preferable that one side of the bottom surface of the support included in one of the adjacent light emitting units is opposed to the vertex of the bottom surface of the support included in the other light emitting unit. In this way, the light distributions do not overlap and become even more uniform than when the apexes or sides of the bottom surfaces of adjacent light emitting units face each other.

本実施形態では発光ユニット１１は基板１６に直接接続しているが、発光ユニット１１と基板１６の間にスペーサを配しても良く、このスペーサが発光ユニットと一体化していても良い（以下同様）。
（第２実施形態） In the present embodiment, the light emitting unit 11 is directly connected to the substrate 16, but a spacer may be disposed between the light emitting unit 11 and the substrate 16, and this spacer may be integrated with the light emitting unit (the same applies hereinafter). ).
(Second Embodiment)

添付図４，５を参照して本発明の第２実施形態を詳細に説明する。本実施形態における照明装置の断面構成は図１に示す第１実施形態の照明装置１０とほぼ同等であるため図示していないが、図１に対し本実施形態における発光ユニット２１の断面形状が異なる。また本実施形態における照明装置の部材は発光ユニット２１を除き図１と共通なので同じ番号を使用する。   A second embodiment of the present invention will be described in detail with reference to FIGS. Although the sectional configuration of the lighting device in the present embodiment is not shown because it is substantially the same as the lighting device 10 of the first embodiment shown in FIG. 1, the sectional shape of the light emitting unit 21 in the present embodiment is different from that in FIG. . Moreover, since the members of the illumination device in this embodiment are the same as those in FIG. 1 except for the light emitting unit 21, the same numbers are used.

図４により本実施形態の照明装置に含まれる発光ユニット２１を説明する。図４は発光ユニット２１の平面図（ａ）及び正面図（ｂ）である。支持体２２は正三角錐であり、底面が基板１６（図１参照）に接続する。支持体２２の各斜面にそれぞれ１個、合計３個のＬＥＤ素子１５が配置されている。なお支持体２２の斜面にＬＥＤ素子１５が配置されているので、ＬＥＤ素子１５の上面とともに、（ａ）では上側の側面、（ｂ）では下側の側面がみえる。   The light emitting unit 21 included in the illumination device of the present embodiment will be described with reference to FIG. FIG. 4 is a plan view (a) and a front view (b) of the light emitting unit 21. The support 22 is a regular triangular pyramid, and the bottom surface is connected to the substrate 16 (see FIG. 1). A total of three LED elements 15 are arranged on each inclined surface of the support 22. Since the LED element 15 is disposed on the slope of the support 22, the upper side surface can be seen in (a) and the lower side surface can be seen in (b) along with the upper surface of the LED element 15.

図５により本実施形態の照明装置に含まれる発光ユニット２１の配列及び配光分布を説明する。図５は、発光ユニット２１の配列の説明図であり、図３と同様に４個の発光ユニット２１が隣接しあう区画を上方から眺めたものである。図中、発光ユニット２１の配光分布２３を点線で示している。配光分布２３は輝度若しくは光束密度を等高線で表した場合の代表的な等高線（例えば最大値の１／２）に相当し、ＬＥＤ素子１５が上面方向を中心とした比較的強い指向性を持っていることを示している。   The arrangement and light distribution of the light emitting units 21 included in the illumination device of this embodiment will be described with reference to FIG. FIG. 5 is an explanatory diagram of the arrangement of the light emitting units 21, as viewed from above the section where the four light emitting units 21 are adjacent to each other as in FIG. 3. In the figure, the light distribution 23 of the light emitting unit 21 is indicated by a dotted line. The light distribution 23 corresponds to a representative contour line (for example, 1/2 of the maximum value) when the luminance or luminous flux density is represented by contour lines, and the LED element 15 has a relatively strong directivity centering on the upper surface direction. It shows that.

発光ユニット２１に含まれる支持体２２は正三角錐なので底面が正三角形で３個の頂点をもつ。本実施形態では多数の発光ユニット２１からなる配列から４個の発光ユニット２１で構成される長方形の区画を選べる。この区画では、図中左側の辺において隣接する一方の発光ユニット２１に含まれる支持体２２の底面の一辺と、他方の発光ユニット２１に含まれる支持体２２の底面の頂点が対向している。右側の辺においても同様に隣接する一方の発光ユニット２１に含まれる支持体２２の底面の一辺と、他方の発光ユニット２１に含まれる支持体２２の底面の頂点が対向している。なお各辺上にある頂点は図中、上下反対方向を向いている（図中、左側の辺が上向き、右側の辺が下向き）。   Since the support 22 included in the light emitting unit 21 is a regular triangular pyramid, the bottom surface is a regular triangle and has three vertices. In the present embodiment, a rectangular section composed of four light emitting units 21 can be selected from an array composed of a large number of light emitting units 21. In this section, one side of the bottom surface of the support 22 included in one of the adjacent light emitting units 21 and the top of the bottom surface of the support 22 included in the other light emitting unit 21 face each other on the left side in the drawing. Similarly, on the right side, one side of the bottom surface of the support 22 included in one adjacent light emitting unit 21 and the top of the bottom surface of the support 22 included in the other light emitting unit 21 face each other. The vertices on each side face in the opposite direction in the figure (in the figure, the left side is upward and the right side is downward).

このようにすると配光分布２３が重ならず均一に広がるようになり好ましい。本実施形態では支持体２２の底面を正三角形としているが、底面は正三角形に限られず二等辺三角形や不等辺三角形、若しくは奇数の頂点をもつ多角形であっても良い。この場合でも、隣接する一方の発光ユニットに含まれる支持体の底面の一辺と、他方の発光ユニットに含まれる支持体の底面の頂点とを対向させ、且つ一方の辺（近傍を含む）に配置された頂点と、他方の辺に配置された頂点とが反対方向を向いていると良い。このようにすると長方形の区画の２辺で発光ユニットに含まれる支持体の底面の頂点が同じ方向を向く場合に比べ配光分布が重ならなくなりよりいっそう均一になる。
（第３実施形態） This is preferable because the light distribution 23 spreads uniformly without overlapping. In the present embodiment, the bottom surface of the support 22 is an equilateral triangle, but the bottom surface is not limited to an equilateral triangle, and may be an isosceles triangle, an unequal triangle, or a polygon having an odd number of vertices. Even in this case, one side of the bottom surface of the support included in one adjacent light emitting unit and the top of the bottom surface of the support included in the other light emitting unit are opposed to each other and arranged on one side (including the vicinity). It is preferable that the arranged vertex and the vertex arranged on the other side face in opposite directions. In this way, the light distributions do not overlap and become even more uniform than when the tops of the bottom surfaces of the supports included in the light emitting unit face the same direction on the two sides of the rectangular section.
(Third embodiment)

添付図６，７を参照して本発明の第３実施形態を詳細に説明する。本実施形態においても照明装置の断面構成は図１に示す第１実施形態の照明装置１０とほぼ同等であるため図示していないが、図１に対し本実施形態における発光ユニット３１の断面形状が異なる。また本実施形態における照明装置の部材は発光ユニット３１を除き図１と共通共通なので同じ番号を使用する。   A third embodiment of the present invention will be described in detail with reference to FIGS. Also in the present embodiment, the cross-sectional configuration of the lighting device is not shown because it is substantially the same as that of the lighting device 10 of the first embodiment shown in FIG. Different. Moreover, since the members of the illumination device in this embodiment are common to those in FIG. 1 except for the light emitting unit 31, the same numbers are used.

図６により本実施形態の照明装置に含まれる発光ユニット３１を説明する。図６は発光ユニット３１の平面図（ａ）及び側面図（ｂ）である。支持体３２は三角柱であり、三角柱の側面の一つが支持体３２の底面となり、この底面が基板１６（図１参照）に接続する。支持体３２の各斜面にそれぞれ６個、合計１２個のＬＥＤ素子１５が配置されている。またＬＥＤ素子１５は２個で一組となっており、実施形態１と同様にＬＥＤ素子１５の使
用効率を向上させるため、平均値が所望の輝度・色度範囲に入るよう調整されている。 The light emitting unit 31 included in the illumination device of this embodiment will be described with reference to FIG. FIG. 6 is a plan view (a) and a side view (b) of the light emitting unit 31. The support body 32 is a triangular prism, and one of the side surfaces of the triangular prism is the bottom surface of the support body 32, and this bottom surface is connected to the substrate 16 (see FIG. 1). A total of twelve LED elements 15 are arranged on each inclined surface of the support 32. Further, two LED elements 15 form a set, and the average value is adjusted so as to fall within a desired luminance / chromaticity range in order to improve the use efficiency of the LED element 15 as in the first embodiment.

なお支持体３２の長手方向は基板１６とほぼ同じ長さであって良いので、照明装置のサイズにより長さが異なり、搭載するＬＥＤ素子１５の数も変わる。また支持体３２の斜面にＬＥＤ素子１５が配置されているので、ＬＥＤ素子１５の上面とともに、（ａ）では上側の側面がみえる。   In addition, since the longitudinal direction of the support body 32 may be the same length as the board | substrate 16, length differs with the size of an illuminating device, and the number of the LED elements 15 mounted also changes. Since the LED element 15 is disposed on the slope of the support 32, the upper side surface can be seen in FIG.

図７により本実施形態の照明装置に含まれる発光ユニット３１の配列及び配光分布を説明する。図７は発光ユニット３１の配列の説明図であり、多数の発光ユニット３１からなる配列のうち２本の発光ユニット３１で構成される区画を上方から眺めたものである。２本の発光ユニット３１は平行に配置されている。なお図中、発光ユニット３１の配光分布３３を点線で示している。配光分布３３は輝度若しくは光束密度を等高線で表した場合の代表的な等高線（例えば最大値の１／２）に相当し、ＬＥＤ素子１５が上面方向を中心とした比較的強い指向性を持っていることを示している。   The arrangement and light distribution of the light emitting units 31 included in the illumination device of this embodiment will be described with reference to FIG. FIG. 7 is an explanatory diagram of the arrangement of the light-emitting units 31, and shows a section composed of two light-emitting units 31 in the arrangement composed of a large number of light-emitting units 31 as viewed from above. The two light emitting units 31 are arranged in parallel. In the drawing, the light distribution 33 of the light emitting unit 31 is indicated by a dotted line. The light distribution 33 corresponds to a representative contour line (for example, 1/2 of the maximum value) when the luminance or luminous flux density is represented by a contour line, and the LED element 15 has a relatively strong directivity centering on the upper surface direction. It shows that.

三角柱である支持体３２において、一方の斜面に配置されるＬＥＤ素子１５と他方の斜面に配置されるＬＥＤ素子１５が、支持体３２の長手方向で異なった位置にある。このようにすると支持体３２の長手方向において異なる斜面に配置されたＬＥＤ素子１５を同じ位置にする場合に比べ、図に示したように配光分布３３が重なり合わなくなりよりいっそう均一に広がるようになる。
（第４実施形態） In the support body 32 which is a triangular prism, the LED elements 15 arranged on one slope and the LED elements 15 placed on the other slope are in different positions in the longitudinal direction of the support body 32. In this way, compared to the case where the LED elements 15 arranged on different slopes in the longitudinal direction of the support 32 are placed at the same position, the light distribution 33 is not overlapped and spreads more uniformly as shown in the figure. Become.
(Fourth embodiment)

第１及び第２実施形態では、発光ユニット１１，２１に含まれる支持体１２，２２が正四角錐，正三角錐であった。しかしながら支持体は多角錐に限定されず、斜面を持てばよい。そこで図８により支持体の頂部が平坦である第４実施形態について説明する。本実施形態においても照明装置の断面構成は図１に示す第１実施形態の照明装置１０とほぼ同等であるため図示していないが、図１に対し本実施形態における発光ユニット４１の断面形状が異なる。また本実施形態における照明装置の部材は発光ユニット４１を除き図１と共通なので同じ番号を使用する。   In the first and second embodiments, the supports 12 and 22 included in the light emitting units 11 and 21 are regular quadrangular pyramids and regular triangular pyramids. However, the support is not limited to a polygonal pyramid and may have a slope. Accordingly, a fourth embodiment in which the top of the support is flat will be described with reference to FIG. Also in this embodiment, the sectional configuration of the lighting device is not shown because it is substantially the same as that of the lighting device 10 of the first embodiment shown in FIG. 1, but the sectional shape of the light emitting unit 41 in this embodiment is different from that in FIG. Different. Moreover, since the members of the illumination device in the present embodiment are the same as those in FIG. 1 except for the light emitting unit 41, the same numbers are used.

図８により本実施形態の照明装置に含まれる発光ユニット４１を説明する。図８は発光ユニット４１の平面図（ａ）及び正面図（ｂ）である。支持体４２は正四角錐の頂部を平坦化した形状をなし、底面が基板１６（図１参照）に接続する。支持体４２の各斜面にそれぞれ２個、合計８個のＬＥＤ素子１５が配置されている。第１実施形態と同様に各斜面に配置したＬＥＤ素子１５の組は、ＬＥＤ素子１５の使用効率を向上させるため、平均値が所望の輝度・色度範囲に入るよう調整されている。なお支持体４２の斜面にＬＥＤ素子１５が配置されているので、ＬＥＤ素子１５の上面とともに、（ａ）では上側の側面、（ｂ）では下側の側面がみえる。   The light emitting unit 41 included in the illumination device of this embodiment will be described with reference to FIG. FIG. 8 is a plan view (a) and a front view (b) of the light emitting unit 41. The support 42 has a shape in which the top of a regular quadrangular pyramid is flattened, and the bottom is connected to the substrate 16 (see FIG. 1). A total of eight LED elements 15 are disposed on each inclined surface of the support 42. Similarly to the first embodiment, the set of LED elements 15 arranged on each slope is adjusted so that the average value falls within a desired luminance / chromaticity range in order to improve the use efficiency of the LED elements 15. Since the LED element 15 is disposed on the inclined surface of the support 42, the upper side surface can be seen in (a) and the lower side surface can be seen in (b) along with the upper surface of the LED element 15.

発光ユニット４１の配列及び配光分布は図３に示した第１実施形態の場合と同じである。本実施形態のように頂部を平坦化すると照明装置の薄型化に貢献できる。また第３実施形態のように長手方向を有する支持体を含む発光ユニットでも同様である。
（第５実施形態） The arrangement and light distribution of the light emitting units 41 are the same as those in the first embodiment shown in FIG. Flattening the top as in the present embodiment can contribute to the thinning of the lighting device. The same applies to a light emitting unit including a support having a longitudinal direction as in the third embodiment.
(Fifth embodiment)

第１、第２及び第４実施形態では、発光ユニット１１，２１，４１に含まれる支持体１２，２２、４２の底面が正四角錐若しくは正三角錐という単純な形状であった。しかしながら前述のように支持体の底面は正方形や正三角形に限定されない。そこで図９により支持体の底面が正方形若しくは正三角形以外の形状となる第５実施形態について説明する。本実施形態においても照明装置の断面構成は図１に示す第１実施形態の照明装置１０とほぼ同等であるため図示していないが、図１に対し本実施形態における発光ユニット５１の
断面形状が異なる。また本実施形態における照明装置の部材は発光ユニット５１を除き図１と共通なので同じ番号を使用する。 In the first, second, and fourth embodiments, the bottom surfaces of the supports 12, 22, and 42 included in the light emitting units 11, 21, and 41 have a simple shape such as a regular quadrangular pyramid or a regular triangular pyramid. However, as described above, the bottom surface of the support is not limited to a square or an equilateral triangle. Accordingly, a fifth embodiment in which the bottom surface of the support has a shape other than a square or an equilateral triangle will be described with reference to FIG. Also in this embodiment, the cross-sectional configuration of the lighting device is not shown because it is substantially the same as that of the lighting device 10 of the first embodiment shown in FIG. Different. Moreover, since the members of the illumination device in this embodiment are the same as those in FIG. 1 except for the light emitting unit 51, the same numbers are used.

図９により本実施形態の照明装置に含まれる発光ユニット５１を説明する。図９は発光ユニット５１の平面図である。支持体５２は正六角錐であり、底面が基板１６（図１参照）に接続する。支持体５２の各斜面にそれぞれ１個、合計６個のＬＥＤ素子１５が配置されている。なお支持体５２の斜面にＬＥＤ素子１５が配置されているので、ＬＥＤ素子１５の上面とともに上側の側面がみえる。   The light emitting unit 51 included in the illumination device of this embodiment will be described with reference to FIG. FIG. 9 is a plan view of the light emitting unit 51. The support body 52 is a regular hexagonal pyramid, and the bottom surface is connected to the substrate 16 (see FIG. 1). A total of six LED elements 15 are arranged on each inclined surface of the support 52. Since the LED element 15 is disposed on the slope of the support body 52, the upper side surface can be seen together with the upper surface of the LED element 15.

図３の説明のなかで述べたように多数の発光ユニット５１からなる配列から長方形の配置となるように隣接しあう４個の発光ユニット５１で構成される区画を選べる場合、この区画では隣接する一方の発光ユニット５１に含まれる支持体５２の底面の一辺と、他方の支持体５２の底面の頂点とを対向させると、配光分布をよりいっそう均一化できる。   As described in the description of FIG. 3, when a section composed of four light emitting units 51 that are adjacent to each other so as to form a rectangular arrangement can be selected from an array of a large number of light emitting units 51, these sections are adjacent to each other. When one side of the bottom surface of the support body 52 included in one light emitting unit 51 is opposed to the vertex of the bottom surface of the other support body 52, the light distribution can be made more uniform.

本発明の照明装置を液晶パネルの背面照明として使用する場合、個別に発光ユニットを点灯制御すれば、表示する映像に合わせて特定の表示領域のみ背面照明を暗くする手法（ローカルディミングともいう）に適用できる。   When the lighting device of the present invention is used as a backlight for a liquid crystal panel, if the lighting unit is individually controlled to be turned on, a method for dimming the backlight only in a specific display area according to the image to be displayed (also referred to as local dimming). Applicable.

１０…照明装置、
１１，２１，３１，４１，５１…発光ユニット、
１２，２２，３２，４２，５２…支持体、
１３，２３，３３…配光分布、
１４…拡散板、
１５…ＬＥＤ素子、
１６…基板、
１７…収納部材。
10 ... lighting device,
11, 21, 31, 41, 51 ... light emitting unit,
12, 22, 32, 42, 52 ... support,
13, 23, 33 ... light distribution,
14 ... diffusion plate,
15 ... LED element,
16 ... substrate,
17: Storage member.

Claims (8)

基板と散乱板の間に複数のＬＥＤ素子を備える面状の照明装置において、発光ユニットを備え、該発光ユニットが前記基板上に配置され、前記発光ユニットが前記基板側に底面、前記散乱板側に複数の斜面を有する支持体を含み、該支持体の斜面に前記ＬＥＤ素子が取り付けられていることを特徴とする照明装置。   In a planar lighting device including a plurality of LED elements between a substrate and a scattering plate, the lighting device includes a light emitting unit, the light emitting unit is disposed on the substrate, the light emitting unit is a bottom surface on the substrate side, and a plurality of light emitting units are on the scattering plate side. A lighting device comprising: a support body having an inclined surface, wherein the LED element is attached to the inclined surface of the support body. 前記支持体は多角錐であることを特徴とする請求項１に記載の照明装置。   The lighting device according to claim 1, wherein the support is a polygonal pyramid. 前記支持体の頂部が平坦であることを特徴とする請求項１又は２に記載の照明装置。   The lighting device according to claim 1, wherein a top portion of the support is flat. 前記発光ユニットに含まれる前記支持体の底面が偶数の頂点をもつ多角形であり、前記発光ユニットからなる配列において最小単位として４個の前記発光ユニットからなる長方形の区画が選べるとき、該区画において隣接する一方の前記発光ユニットに含まれる前記支持体の底面の一辺と、他方の前記発光ユニットに含まれる前記支持体の底面の頂点とが対向することを特徴とする請求項１から３のいずれか一項に記載の照明装置。   When the bottom surface of the support included in the light emitting unit is a polygon having an even number of vertices, and a rectangular section composed of four light emitting units can be selected as a minimum unit in the array composed of the light emitting units, 4. The method according to claim 1, wherein one side of the bottom surface of the support included in one of the adjacent light emitting units is opposed to a vertex of the bottom surface of the support included in the other light emitting unit. The lighting device according to claim 1. 前記発光ユニットに含まれる前記支持体の底面が奇数の頂点をもつ多角形であり、前記発光ユニットからなる配列において最小単位として４個の前記発光ユニットからなる長方形の区画が選べるとき、該区画において隣接する一方の発光ユニットに含まれる前記支持体の底面の一辺と、他方の発光ユニットに含まれる前記支持体の底面の頂点が対向する発光ユニットの組が２個あり、各組の前記頂点の向く方向が反対であることを特徴とする請求項１から３のいずれか一項に記載の照明装置。   When the bottom surface of the support included in the light emitting unit is a polygon having an odd number of vertices, and a rectangular section composed of four light emitting units can be selected as a minimum unit in the array composed of the light emitting units, There are two sets of light emitting units in which one side of the bottom surface of the support included in one adjacent light emitting unit and the top of the bottom surface of the support included in the other light emitting unit face each other. The illuminating device according to any one of claims 1 to 3, wherein a direction in which the light is directed is opposite. 前記支持体は三角柱であり、その側面の一つが底面となることを特徴とする請求項１に記載の照明装置。   The lighting device according to claim 1, wherein the support is a triangular prism, and one of side surfaces thereof is a bottom surface. 前記支持体の頂部が平坦であることを特徴とする請求項６に記載の照明装置。   The lighting device according to claim 6, wherein a top portion of the support is flat. 前記発光ユニットに含まれる前記支持体が三角柱であるとき、該支持体の一方の斜面に配置されるＬＥＤ素子と他方の斜面に配置されるＬＥＤ素子が、該支持体の長手方向で異なった位置にあることを特徴とする請求項３に記載の照明装置。

When the support included in the light emitting unit is a triangular prism, the LED elements disposed on one slope of the support and the LED elements disposed on the other slope are different in the longitudinal direction of the support. The lighting device according to claim 3, wherein

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