JP2004055850A

JP2004055850A - Lighting system using light-emitting diode element

Info

Publication number: JP2004055850A
Application number: JP2002211693A
Authority: JP
Inventors: Hiroshi Sase; 佐瀬　洋; Atsushi Kato; 加登　篤; Hideyuki Kitanaka; 北仲　秀行
Original assignee: Endo Lighting Corp
Current assignee: Endo Lighting Corp
Priority date: 2002-07-19
Filing date: 2002-07-19
Publication date: 2004-02-19

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lighting system using light-emitting diode elements capable of illuminating more uniformly an illumination plane. <P>SOLUTION: The lighting system is used for illuminating a rectangular illumination plane, and is equipped with forty light-emitting diode elements a1 to a8, b1 to b8, c1 to c8, d1 to d8, and e1 to e8. When dividing the illumination plane K that is illuminated by light from the light-emitting diode elements a1 to a8, b1 to b8, c1 to c8, d1 to d8, and e1 to e8, into forty smaller illumination planes A1 to A8, B1 to B8, C1 to C8, D1 to D8, E1 to E8 with an equal area to one another to illuminate the one smaller illumination plane by the one light-emitting diode element, an optical axis of the assigned one light-emitting diode element is directed to the center of the one assigned smaller illumination plane. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は、複数の発光ダイオード素子を用いた照明装置に関する。
【０００２】
【従来の技術】
従来のこの種の照明装置は、基板に複数の発光ダイオード素子をマトリクス状に配列したものがある。そして、各発光ダイオード素子の光軸は、光が照射される照射平面に対して垂直になっているものがある（真下タイプと称する。）。また、各発光ダイオード素子の光軸Ｌは、隣接する発光ダイオード素子の光軸と垂直軸とがなす角度の差がすべて等しく設定されているものもある（等差角タイプと称する。）。
【０００３】
【発明が解決しようとする課題】
しかしながら、上述した従来の照明装置のうち、光軸が照射平面に対して垂直になっている真下タイプのものは、図１１、図１３に示すように、照明装置の真下付近のみが明るくなる。また、前記等差角タイプの照明装置では、図１２、図１４に示すように、真下タイプのものより光は拡がるが、中心部の最も明るい部分と周囲の暗い部分との照度の差が大きいという問題がある。すなわち、真下タイプのものも等差角タイプものでも、スポットライト的な使用には適しているが、照射平面をよりむらなく均一に照らすことはできないという問題があった。
【０００４】
本発明は上記事情に鑑みて創案されたもので、照射平面をよりむらなく均一に照らすことができる発光ダイオード素子を用いた照明装置を提供することを目的としている。
【０００５】
【課題を解決するための手段】
本発明に係る発光ダイオード素子を用いた照明装置は、複数の発光ダイオード素子を有する発光ダイオード素子を用いた照明装置であって、前記発光ダイオード素子からの光が照射される照射平面を等しい面積を有する複数の照射小面に分割し、１又は複数の発光ダイオード素子により１つの照射小面を照射する場合、担当する照射小面の中心位置に対して、その照射小面を担当する１又は複数の発光ダイオード素子の光軸を向けている。
【０００６】
【発明の実施の形態】
図１は本発明の第１の実施の形態に係る発光ダイオード素子を用いた照明装置の発光ダイオード素子の配置を示す概略的説明図、図２は本発明の第１の実施の形態に係る発光ダイオード素子を用いた照明装置によって照射される照射平面及び照射小面を説明する概略的説明図、図３は本発明の第１の実施の形態に係る発光ダイオード素子を用いた照明装置の光軸を示す概略的説明図、図４は本発明の第１の実施の形態に係る発光ダイオード素子を用いた照明装置の照射平面における照度を示す概略的照度分布図、図５は本発明の第１の実施の形態に係る発光ダイオード素子を用いた照明装置の照射平面における照度を示す概略的照度グラフである。
【０００７】
また、図６は本発明の第２の実施の形態に係る発光ダイオード素子を用いた照明装置の発光ダイオード素子の配置を示す概略的説明図、図７は本発明の第２の実施の形態に係る発光ダイオード素子を用いた照明装置によって照射される照射平面及び照射小面を説明する概略的説明図、図８は本発明の第２の実施の形態に係る発光ダイオード素子を用いた照明装置の光軸を示す概略的説明図、図９は本発明の第２の実施の形態に係る発光ダイオード素子を用いた照明装置の照射平面における照度を示す概略的照度分布図、図１０は本発明の第２の実施の形態に係る発光ダイオード素子を用いた照明装置の照射平面における照度を示す概略的照度グラフである。
【０００８】
さらに、図１１は本発明の第１の実施の形態に係る発光ダイオード素子を用いた照明装置との対比用の従来の発光ダイオード素子を用いた真下タイプの照明装置の照射平面における照度を示す概略的照度グラフ、図１２は本発明の第１の実施の形態に係る発光ダイオード素子を用いた照明装置との対比用の従来の発光ダイオード素子を用いた等差角タイプの照明装置の照射平面における照度を示す概略的照度グラフ、図１３は本発明の第２の実施の形態に係る発光ダイオード素子を用いた照明装置との対比用の従来の発光ダイオード素子を用いた真下タイプの照明装置の照射平面における照度を示す概略的照度グラフ、図１４は本発明の第２の実施の形態に係る発光ダイオード素子を用いた照明装置との対比用の従来の発光ダイオード素子を用いた等差角タイプの照明装置の照射平面における照度を示す概略的照度グラフである。
【０００９】
本発明の第１の実施の形態に係る発光ダイオード素子を用いた照明装置１００は、矩形状の照射平面Ｋを照射するものであって、８０個の発光ダイオード素子ａ１〜ａ１６、ｂ１〜ｂ１６、ｃ１〜ｃ１６、ｄ１〜ｄ１６、ｅ１〜ｅ１６を有する発光ダイオード素子を用いた照明装置であり、前記発光ダイオード素子ａ１〜ａ１６、ｂ１〜ｂ１６、ｃ１〜ｃ１６、ｄ１〜ｄ１６、ｅ１〜ｅ１６からの光が照射される照射平面Ｋを等しい面積を有する８０個の照射小面Ａ１〜Ａ１６、Ｂ１〜Ｂ１６、Ｃ１〜Ｃ１６、Ｄ１〜Ｄ１６、Ｅ１〜Ｅ１６に分割し、１つの発光ダイオード素子により１つの照射小面を照射する場合、担当する照射小面の中心位置に対して、その照射小面を担当する１つの発光ダイオード素子の光軸を向けている。
【００１０】
まず、本発明の第１の実施の形態に係る発光ダイオード素子を用いた照明装置１００の説明の前に、この照明装置１００によって照射される照射平面Ｋについて説明する。
例えば、図２に示すように、３．２ｍ×１ｍの大きさを有する照射平面Ｋであれば、それぞれが０．２ｍ×０．２ｍの面積を有する合計８０個の照射小面Ａ１〜Ａ１６、Ｂ１〜Ｂ１６、Ｃ１〜Ｃ１６、Ｄ１〜Ｄ１６、Ｅ１〜Ｅ１６に分割する。そして、照射平面Ｋを横行を上から下に向かってＡ〜Ｅの５行とし、縦行を左から右に向かって１〜１６の１６行とし、各照射平面は、横行及び縦行の符号の符号で表示するものとする。
【００１１】
すると、照射平面Ｋの上端かつ左端を原点とした場合、各照射小面Ａ１〜Ａ１６、Ｂ１〜Ｂ１６、Ｃ１〜Ｃ１６、Ｄ１〜Ｄ１６、Ｅ１〜Ｅ１６の中心位置ＸＹ座標は、表１に示すようになる。
【００１２】
【表１】

【００１３】
かかる照射平面Ｋに対して、前記照射小面Ａ８と照射小面Ａ９との間に高さ２ｍのポール１１０を設け、このポール１１０の上端に照明装置１００を設けたとする。
【００１４】
この照明装置１００は、全部で８０個の発光ダイオード素子ａ１〜ａ１６、ｂ１〜ｂ１６、ｃ１〜ｃ１６、ｄ１〜ｄ１６、ｅ１〜ｅ１６を有しており、１つの発光ダイオード素子が１つの照射小面に対する光の照射を受け持つようにする。すなわち、１つの発光ダイオード素子の光軸が１つの照射小面に向かうようにする。なお、各発光ダイオード素子ａ１〜ａ１６、ｂ１〜ｂ１６、ｃ１〜ｃ１６、ｄ１〜ｄ１６、ｅ１〜ｅ１６は、照射小面Ａ１〜Ａ１６、Ｂ１〜Ｂ１６、Ｃ１〜Ｃ１６、Ｄ１〜Ｄ１６、Ｅ１〜Ｅ１６と同様に１６×５の配列になっており、各発光ダイオード素子ａ１〜ａ１６、ｂ１〜ｂ１６、ｃ１〜ｃ１６、ｄ１〜ｄ１６、ｅ１〜ｅ１６は、横行を上から下に向かってａ〜ｅの５行とし、縦行を左から右に向かって１〜１６の１６行とし、各発光ダイオード素子は、横行及び縦行の符号の符号で表示するものとする。なお、例えば、発光ダイオード素子ａ１は照射小面Ａ１を、発光ダイオードｂ３は照射小面Ｂ３をそれぞれ照射するようにする。
【００１５】
かかる発光ダイオード素子ａ１〜ａ１６、ｂ１〜ｂ１６、ｃ１〜ｃ１６、ｄ１〜ｄ１６、ｅ１〜ｅ１６は、図１に示すように配列される。すなわち、上述したように、それぞれが等しい面積を有する各照射小面Ａ１〜Ａ１６、Ｂ１〜Ｂ１６、Ｃ１〜Ｃ１６、Ｄ１〜Ｄ１６、Ｅ１〜Ｅ１６の中心位置に、各発光ダイオード素子ａ１〜ａ１６、ｂ１〜ｂ１６、ｃ１〜ｃ１６、ｄ１〜ｄ１６、ｅ１〜ｅ１６の光軸Ｌを向けるため、遠くの照射小面を担当する発光ダイオード素子ほど、その光軸と垂直軸との角度が大きくなるように設定されているのである。
【００１６】
なお、本明細書における実験では、この発光ダイオード素子ａ１〜ａ１６、ｂ１〜ｂ１６、ｃ１〜ｃ１６、ｄ１〜ｄ１６、ｅ１〜ｅ１６には、中心光度１０ｃｄ、１／２光度角１５°の性能を有するものを使用している。
【００１７】
このように各発光ダイオード素子ａ１〜ａ１６、ｂ１〜ｂ１６、ｃ１〜ｃ１６、ｄ１〜ｄ１６、ｅ１〜ｅ１６を配置した場合、各発光ダイオード素子ａ１〜ａ１６、ｂ１〜ｂ１６、ｃ１〜ｃ１６、ｄ１〜ｄ１６、ｅ１〜ｅ１６の光軸Ｌの垂直軸Ｙに対する傾きは、それぞれ異なるものとなる。詳しくは、各発光ダイオード素子の光軸は、照明装置１００から離れた位置にある照射小面を担当する発光ダイオード素子ほど垂直軸Ｙに対する光軸Ｌの傾き（鉛直角）が大きくなるのである。
【００１８】
例えば、図３に示すように、光軸Ｌがある照射小面に向かっている発光ダイオード素子では、その照射小面の中心点と照明装置１００が設けられたポール１１０の根元とがなす角度を平面角θｈとし、垂直軸であるポール１１０とがなす角度を正面方向からみた正面角θｖとすると、θｖ＝ｔａｎ　^−１（ｘ／Ｈ）、θｈ＝ｔａｎ　^−１（ｘ／ｙ）となる。なお、Ｈはポール１１０の高さ寸法、（ｘ、ｙ）は照射小面の中心座標である。
【００１９】
なお、照明装置１００は、照射小面Ａ８と照射小面Ａ９との間に設けられているため、照射平面Ｋは照射小面Ａ８と照射小面Ａ９との境目を軸として左右対称になっているため、右側半分のみについて考察する。
【００２０】
各照射小面に対する各発光ダイオード素子の光軸の向きを示す正面角θｖ及び平面角θｈは、以下の表２のようになる。
【００２１】
【表２】

【００２２】
このように各発光ダイオード素子を配置した場合の照射平面Ｋの照度は、図４に示すようになる。
【００２３】
詳しく述べると、照射小面Ｂ４〜Ｂ１３、Ｃ４〜Ｃ１３を含む略長円状の９ルクス以上１１ルクス未満の照度を有する領域Ａｒｉａ１１ができる。この９ルクス以上１１ルクス未満の照度を有する領域Ａｒｉａ１１の周囲、すなわち照射小面Ａ４〜Ａ１４、Ｂ３〜Ｂ１４、Ｃ３〜Ｃ１４、Ｄ３〜Ｄ１４を含む略長円状の７ルクス以上９ルクス未満の照度を有する領域Ａｒｉａ９ができる。
【００２４】
また、この７ルクス以上９ルクス未満の照度を有する領域Ａｒｉａ９の周囲には、照射小面Ａ２〜Ａ１４、Ｂ２〜Ｂ３、Ｂ１４〜Ｂ１５、Ｃ２、Ｃ１５、Ｄ２〜Ｄ１５、Ｅ３〜Ｅ１４を含む略長円状の５ルクス以上７ルクス未満の照度を有する領域Ａｒｉａ７ができる。さらに、この５ルクス以上７ルクス未満の照度を有する領域Ａｒｉａ７の周囲には、照射小面Ａ２〜Ａ１５、Ｂ１〜Ｂ２、Ｂ１５〜Ｂ１６、Ｃ１〜２、Ｃ１５〜１６、Ｄ１〜Ｄ２、Ｄ１５〜Ｄ１６、Ｅ２〜Ｅ１５を含む略長円状の３ルクス以上５ルクス未満の照度を有する領域Ａｒｉａ５ができる。
【００２５】
また、この３ルクス以上５ルクス未満の照度を有する領域Ａｒｉａ５の周囲には、照射小面Ａ１〜Ａ２、Ａ１５〜Ａ１６、Ｂ１、Ｂ１６、Ｄ１、Ｄ１６、Ｅ１〜Ｅ２、Ｅ１５〜Ｅ１６を含む略長円状の３ルクス未満の照度を有する領域Ａｒｉａ３ができる。
【００２６】
この照明装置１００では、幅広く均一な照度を確保できていることが図５からも判明する。
【００２７】
これを、図１１の示す従来の真下タイプの照明装置の照射平面の照度と比較すると、本実施の形態に係る照明装置１００は、最も照度の高い照射小面は約１０ルクスで、最も照度の低い照射小面は約３ルクスであるのに対し、従来の真下タイプの照明装置の照射平面では、最も照度の高い照射小面は約１２ルクスで、最も照度の低い照射小面は０ルクスである。すなわち、本実施の形態に係る照明装置１００の方が、最大照度の部分と最小照度の部分との差が小さい、換言すると、本実施の形態に係る照明装置１００の方が照射平面Ｋをむらなくより均一に照射していることがわかる。
【００２８】
また、従来の等差角タイプの照明装置の照度は、図１２に示すように、最も高くて約１１ルクスであるのに対して、最も低くて約５ルクスである。しかし、本実施の形態に係る照明装置１００の方が、約１０ルクスの照度を得られる照射小面が多いことが図５との比較から判明する。従って、本実施の形態に係る照明装置１００の方が照射平面Ｋをむらなくより均一に照射していることがわかる。
【００２９】
なお、この従来の等差角タイプの照明装置は、すべての発光ダイオード素子Ａの基板Ｂにおける配置位置は本実施の形態に係るものと同一であるが、隣接する各発光ダイオード素子Ａの光軸Ｌと垂直軸Ｙとがなす角度の差がすべてが５°となっているものである。
【００３０】
次に、円形の照射平面ＫＣを照らす照明装置３００について説明する。
かかる照明装置３００の場合には、円形の基板に５つの同心円上を形成し、それぞれ４個、１２個、２０個、２８個、３６個の合計１００個の発光ダイオード素子ａ１〜ａ４、ｂ１〜ｂ１２、ｃ１〜ｃ２０、ｄ１〜ｄ２８、ｅ１〜ｅ３６を配置する。そして、最も中心の４個の発光ダイオード素子ａ１〜ａ４の光軸と垂直軸とがなす角度より、より外側に位置する発光ダイオード素子ｂ１〜１２ｂ、ｃ１〜ｃ２０、ｄ１〜ｄ２８、ｅ１〜ｅ３６の光軸が垂直軸となす角度の方が徐々に大きくなっている。照明素子３００を取り付けるポール３１０は、前記基板の中心に立設されることになる。
【００３１】
この場合、照射平面ＫＣは、図７に示すように半径１ｍ、２ｍ、３ｍ、４ｍ、５ｍの５つの同心円をそれぞれ、１個、１２個、２０個、２８個、３６個に分割することで、照射平面Ａ１〜Ａ４、Ｂ１〜Ｂ１２、Ｃ１〜Ｃ２０、Ｄ１〜Ｄ２８、Ｅ１〜Ｅ３６の面積を等しくしている。
【００３２】
中心に高さ７ｍのポール３１０を設け、このポール３１０に照明装置３００を設置した場合には、図９に示すような照度分布を得ることができた。すなわち、照明装置３００の真下に当たる照射小面Ａの中心部付近の照度は約０．５５ルクス以上、最も外側でも約０．３ルクスであった。
【００３３】
詳述すると、照射小面Ａ１を含む０．５ルクス以上０．６ルクス未満の円形の領域Ａｒｉａ０．６、照射小面Ａ１、Ｂ１〜１２、Ｃ１〜Ｃ２０、Ｄ１〜Ｄ２８、Ｅ１〜Ｅ３６を含み、前記領域Ａｒｉａ０．６の外側の０．４ルクス以上０．５ルクス未満の環状の領域Ａｒｉａ０．５、照射小面Ｅ１〜Ｅ３６を含み、前記領域Ａｒｉａ０．５の外側の０．４ルクス未満の環状の領域Ａｒｉａ０．４がそれぞれ形成されることになる。
【００３４】
かかる照明装置３００の発光ダイオード素子は、図８に示すように、照明装置３００に近い照射小面を担当する発光ダイオード素子の光軸が垂直軸Ｙとなす角度θ１と、より遠い照射小面を担当する発光ダイオード素子の光軸が垂直軸Ｙとなす角度θ２とでは、θ１＜θ２となる。発光ダイオード素子ａ１ではθ＝４．０９°、発光ダイオード素子ｂ１ではθ＝１２．０９°、発光ダイオード素子ｃ１ではθ＝１９．６５°、発光ダイオード素子ｄ１ではθ＝２６．５７°、発光ダイオード素子ｅ１ではθ＝３２．７４°となっている。
【００３５】
これに対して、従来の照明装置、すなわち、真下タイプの照明装置では、図１３示すように、最も照度の高い部分で約１０ルクス、最も低い部分で０ルクスとなっている。従って、図１０と比較すると、従来の真下タイプの照明装置の方が照度が高いが、本実施の形態に係る照明装置３００の方が照度むらがなく均一な照明を得ることができるといえる。
【００３６】
また、従来の等差角タイプの照明装置の照度分布を示す図１２と比較すると、従来の等差角タイプの照明装置の方が照度が高いが、本実施の形態に係る照明装置３００の方が照度むらがなく均一な照明を得ることができるといえる。
【００３７】
なお、上述した２つの実施の形態では、１つの発光ダイオード素子が１つの照射小面を照射するとして説明を行ったが、２以上の発光ダイオード素子が１つの照射小面を照射するようにしてもよい。この場合には、全体の照度を向上させることができることはいうまでもない。
【００３８】
【発明の効果】
本発明に係る発光ダイオード素子を用いた照明装置は、複数の発光ダイオード素子を有する発光ダイオード素子を用いた照明装置であって、前記発光ダイオード素子からの光が照射される照射平面を等しい面積を有する複数の照射小面に分割し、１又は複数の発光ダイオード素子により１つの照射小面を照射する場合、担当する照射小面の中心位置に対して、その照射小面を担当する１又は複数の発光ダイオード素子の光軸を向けている。
【００３９】
すると、この発光ダイオード素子を用いた照明装置では、遠くの照射小面を照射する発光ダイオード素子の方が、隣接する各発光ダイオード素子の光軸と垂直軸とがなす角度の差が小さくなる。すなわち、従来のように、発光ダイオード素子の光軸が一様に真下に向いているものや、隣接する発光ダイオード素子の光軸と垂直軸とがなす角度の差が等しいものとは相違する。
また、各照射小面の照度Ｅは、Ｅ＝Φ／Ａ（ただし、Φは光束、Ａは面積）、すなわち発光ダイオード素子が発光する光束が照射小面に入射する量によって表され、この発光ダイオード素子を用いた照明装置では、各発光ダイオード素子が担当する照射小面に入射する光束量が均一になるような構成にしている点でも、従来のものとは大きく異なる。かかる構成であると、照射平面を全体的にむらなく均一に照射することができるというメリットがある。
【図面の簡単な説明】
【図１】本発明の第１の実施の形態に係る発光ダイオード素子を用いた照明装置の発光ダイオード素子の配置を示す概略的説明図である。
【図２】本発明の第１の実施の形態に係る発光ダイオード素子を用いた照明装置によって照射される照射平面及び照射小面を説明する概略的説明図である。
【図３】本発明の第１の実施の形態に係る発光ダイオード素子を用いた照明装置の光軸を示す概略的説明図である。
【図４】本発明の第１の実施の形態に係る発光ダイオード素子を用いた照明装置の照射平面における照度を示す概略的照度分布図である。
【図５】本発明の第１の実施の形態に係る発光ダイオード素子を用いた照明装置の照射平面における照度を示す概略的照度グラフである。
【図６】本発明の第２の実施の形態に係る発光ダイオード素子を用いた照明装置の発光ダイオード素子の配置を示す概略的説明図である。
【図７】本発明の第２の実施の形態に係る発光ダイオード素子を用いた照明装置によって照射される照射平面及び照射小面を説明する概略的説明図である。
【図８】本発明の第２の実施の形態に係る発光ダイオード素子を用いた照明装置の光軸を示す概略的説明図である。
【図９】本発明の第２の実施の形態に係る発光ダイオード素子を用いた照明装置の照射平面における照度を示す概略的照度分布図である。
【図１０】本発明の第２の実施の形態に係る発光ダイオード素子を用いた照明装置の照射平面における照度を示す概略的照度グラフである。
【図１１】本発明の第１の実施の形態に係る発光ダイオード素子を用いた照明装置との対比用の従来の発光ダイオード素子を用いた真下タイプの照明装置の照射平面における照度を示す概略的照度グラフである。
【図１２】本発明の第１の実施の形態に係る発光ダイオード素子を用いた照明装置との対比用の従来の発光ダイオード素子を用いた等差角タイプの照明装置の照射平面における照度を示す概略的照度グラフである。
【図１３】本発明の第２の実施の形態に係る発光ダイオード素子を用いた照明装置との対比用の従来の発光ダイオード素子を用いた真下タイプの照明装置の照射平面における照度を示す概略的照度グラフである。
【図１４】本発明の第２の実施の形態に係る発光ダイオード素子を用いた照明装置との対比用の従来の発光ダイオード素子を用いた等差角タイプの照明装置の照射平面における照度を示す概略的照度グラフである。
【符号の説明】
１００　　発光ダイオード素子を用いた照明装置
１１０　　ポール
Ｋ　　　　照射平面
Ａ１〜Ｅ８　照射小面
ａ１ｅ８　発光ダイオード素子[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a lighting device using a plurality of light emitting diode elements.
[0002]
[Prior art]
2. Description of the Related Art A conventional illumination device of this type includes a substrate in which a plurality of light emitting diode elements are arranged in a matrix. Some light-emitting diode elements have an optical axis that is perpendicular to an irradiation plane on which light is irradiated (referred to as a direct-under type). In some cases, the optical axis L of each light emitting diode element is set so that the difference between the angles formed by the optical axis of the adjacent light emitting diode elements and the vertical axis is all equal (referred to as an equiangular angle type).
[0003]
[Problems to be solved by the invention]
However, among the above-described conventional illumination devices, those of a type directly below the illumination device whose optical axis is perpendicular to the irradiation plane, as shown in FIGS. Further, in the isometric angle type illuminating device, as shown in FIGS. 12 and 14, light spreads more than the direct-illumination type, but the difference in illuminance between the brightest portion at the center and the dark portion around is large. There is a problem. In other words, both the right-down type and the equi-angle type are suitable for use as a spotlight, but there is a problem that the irradiation plane cannot be evenly and uniformly illuminated.
[0004]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a lighting device using a light-emitting diode element that can uniformly illuminate an irradiation plane evenly.
[0005]
[Means for Solving the Problems]
A lighting device using a light-emitting diode element according to the present invention is a lighting device using a light-emitting diode element having a plurality of light-emitting diode elements, and has an equal irradiation area to which light from the light-emitting diode element is irradiated. When irradiating one irradiation facet with one or a plurality of light emitting diode elements and dividing the irradiation facet into a plurality of irradiation facets, one or more of the irradiation facets are assigned to a center position of the irradiation facet to be handled. The light axis of the light emitting diode element is oriented.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a schematic explanatory view showing the arrangement of light emitting diode elements of a lighting device using the light emitting diode elements according to the first embodiment of the present invention, and FIG. 2 is light emission according to the first embodiment of the present invention. FIG. 3 is a schematic explanatory view illustrating an irradiation plane and an irradiation small surface irradiated by a lighting device using a diode element. FIG. 3 is an optical axis of a lighting device using a light emitting diode element according to the first embodiment of the present invention. FIG. 4 is a schematic illuminance distribution diagram showing illuminance on an irradiation plane of an illuminating device using the light emitting diode element according to the first embodiment of the present invention, and FIG. 6 is a schematic illuminance graph showing illuminance on an illumination plane of a lighting device using the light-emitting diode element according to the embodiment.
[0007]
FIG. 6 is a schematic explanatory view showing an arrangement of a light emitting diode element of a lighting device using a light emitting diode element according to a second embodiment of the present invention, and FIG. 7 is a view showing a second embodiment of the present invention. FIG. 8 is a schematic explanatory view illustrating an irradiation plane and an irradiation small surface irradiated by the lighting device using the light emitting diode element. FIG. 8 is a diagram illustrating a lighting device using the light emitting diode element according to the second embodiment of the present invention. FIG. 9 is a schematic explanatory view showing an optical axis, FIG. 9 is a schematic illuminance distribution diagram showing illuminance on an irradiation plane of an illuminating device using a light emitting diode element according to a second embodiment of the present invention, and FIG. It is a schematic illuminance graph which shows the illuminance in the illumination plane of the illuminating device using the light emitting diode element which concerns on 2nd Embodiment.
[0008]
Further, FIG. 11 is a schematic diagram showing an illuminance on an irradiation plane of a lighting device of a direct type using a conventional light emitting diode element for comparison with a lighting device using a light emitting diode element according to the first embodiment of the present invention. FIG. 12 is an illumination plane of an isometric angle type lighting device using a conventional light emitting diode element for comparison with a lighting device using a light emitting diode element according to the first embodiment of the present invention. FIG. 13 is a schematic illuminance graph showing illuminance, and FIG. 13 is an illumination of a lighting device of a direct type using a conventional light emitting diode element for comparison with a lighting apparatus using a light emitting diode element according to the second embodiment of the present invention. FIG. 14 is a schematic illuminance graph showing illuminance in a plane, and FIG. 14 shows a conventional light-emitting diode element for comparison with a lighting device using the light-emitting diode element according to the second embodiment of the present invention. Is a schematic illuminance graph showing the illuminance in had been irradiated plane of the arithmetic angle type lighting device.
[0009]
The lighting apparatus 100 using the light emitting diode elements according to the first embodiment of the present invention irradiates a rectangular irradiation plane K, and includes 80 light emitting diode elements a1 to a16, b1 to b16, A lighting device using a light-emitting diode element having c1 to c16, d1 to d16, and e1 to e16. Light from the light-emitting diode elements a1 to a16, b1 to b16, c1 to c16, d1 to d16, and e1 to e16. Is divided into 80 irradiation small surfaces A1 to A16, B1 to B16, C1 to C16, D1 to D16, and E1 to E16 having the same area, and one irradiation is performed by one light emitting diode element. When irradiating a small surface, the optical axis of one light emitting diode element that is in charge of the irradiation small surface is directed to the center position of the irradiation small surface in charge.
[0010]
First, before describing the lighting device 100 using the light emitting diode elements according to the first embodiment of the present invention, an irradiation plane K illuminated by the lighting device 100 will be described.
For example, as shown in FIG. 2, if the irradiation plane K has a size of 3.2 m × 1 m, a total of 80 irradiation small surfaces A 1 to A 16 each having an area of 0.2 m × 0.2 m, It is divided into B1 to B16, C1 to C16, D1 to D16 and E1 to E16. Then, the irradiation plane K is made up of five rows A to E in the horizontal direction from top to bottom, and the vertical row is made up of 16 lines 1 to 16 in the left to right direction. It shall be indicated by the sign of.
[0011]
Then, when the upper end and the left end of the irradiation plane K are set as the origin, the center position XY coordinates of each irradiation small surface A1 to A16, B1 to B16, C1 to C16, D1 to D16, and E1 to E16 are as shown in Table 1. become.
[0012]
[Table 1]

[0013]
It is assumed that a pole 110 having a height of 2 m is provided between the irradiation small surface A8 and the irradiation small surface A9 with respect to the irradiation plane K, and the illumination device 100 is provided at an upper end of the pole 110.
[0014]
This lighting device 100 has a total of 80 light emitting diode elements a1 to a16, b1 to b16, c1 to c16, d1 to d16, and e1 to e16, and one light emitting diode element is one irradiation facet. To take care of the light irradiation. That is, the optical axis of one light emitting diode element is directed to one irradiation facet. In addition, each light emitting diode element a1-a16, b1-b16, c1-c16, d1-d16, e1-e16 is irradiation small surface A1-A16, B1-B16, C1-C16, D1-D16, E1-E16. Similarly, the light emitting diode elements a1 to a16, b1 to b16, c1 to c16, d1 to d16, and e1 to e16 are arranged in a 16 × 5 array. A row is defined as 16 rows from 1 to 16 from left to right, and each light-emitting diode element is represented by a code of a row and a row. For example, the light emitting diode element a1 irradiates the irradiation small surface A1, and the light emitting diode b3 irradiates the irradiation small surface B3.
[0015]
The light emitting diode elements a1 to a16, b1 to b16, c1 to c16, d1 to d16, and e1 to e16 are arranged as shown in FIG. That is, as described above, the light emitting diode elements a1 to a16, b1 are located at the center positions of the irradiation small surfaces A1 to A16, B1 to B16, C1 to C16, D1 to D16, E1 to E16, each having the same area. B16, c1 to c16, d1 to d16, and e1 to e16, so that the light axis of the light emitting diode element that is in charge of the irradiating small surface is set to have a larger angle between the optical axis and the vertical axis. It is being done.
[0016]
In the experiments in this specification, the light emitting diode elements a1 to a16, b1 to b16, c1 to c16, d1 to d16, and e1 to e16 have the performance of a central luminous intensity of 10 cd and a luminous intensity angle of 15 °. Use things.
[0017]
When the light emitting diode elements a1 to a16, b1 to b16, c1 to c16, d1 to d16, and e1 to e16 are arranged in this manner, the light emitting diode elements a1 to a16, b1 to b16, c1 to c16, d1 to d16 , E1 to e16 have different inclinations with respect to the vertical axis Y of the optical axis L. More specifically, the inclination (vertical angle) of the optical axis L with respect to the vertical axis Y increases with the light axis of each light emitting diode element that is in charge of the irradiation facet located farther from the lighting device 100.
[0018]
For example, as shown in FIG. 3, in a light emitting diode element in which the optical axis L is directed toward a certain irradiation facet, the angle formed by the center point of the irradiation facet and the base of the pole 110 provided with the lighting device 100 is determined. Assuming that the plane angle is θh and the angle between the pole 110 which is a vertical axis and the front angle is θv when viewed from the front, θv = tan ⁻¹ (x / H) and θh = tan ⁻¹ (x / y). Note that H is the height dimension of the pole 110, and (x, y) is the center coordinate of the irradiation small surface.
[0019]
Since the illumination device 100 is provided between the irradiation small surface A8 and the irradiation small surface A9, the irradiation plane K is bilaterally symmetric about the boundary between the irradiation small surface A8 and the irradiation small surface A9. Therefore, only the right half is considered.
[0020]
The front angle θv and the plane angle θh indicating the direction of the optical axis of each light emitting diode element with respect to each irradiation facet are as shown in Table 2 below.
[0021]
[Table 2]

[0022]
The illuminance on the irradiation plane K when the respective light emitting diode elements are arranged as described above is as shown in FIG.
[0023]
More specifically, a substantially elliptical area Aria11 including the irradiation small surfaces B4 to B13 and C4 to C13 and having an illuminance of 9 to 11 lux is formed. Around the area Aria11 having an illuminance of 9 lux or more and less than 11 lux, that is, a substantially elliptical illuminance of 7 lux or more and less than 9 lux including the irradiation small surfaces A4 to A14, B3 to B14, C3 to C14, and D3 to D14. Is formed in the area Aria9.
[0024]
Around the area Aria9 having an illuminance of 7 lux or more and less than 9 lux, an approximate length including irradiation small surfaces A2 to A14, B2 to B3, B14 to B15, C2, C15, D2 to D15, and E3 to E14. A circular area Aria7 having an illuminance of 5 lux or more and less than 7 lux is formed. Further, around the area Aria7 having an illuminance of 5 lux or more and less than 7 lux, irradiation small surfaces A2 to A15, B1 to B2, B15 to B16, C1 to 2, C15 to 16, D1 to D2, D15 to D16 , E2 to E15, and a region Aria5 having an illuminance of 3 lux or more and less than 5 lux is formed.
[0025]
Further, around the area Aria5 having an illuminance of 3 lux or more and less than 5 lux, a substantially long area including the irradiation small surfaces A1 to A2, A15 to A16, B1, B16, D1, D16, E1 to E2, and E15 to E16. There is a circular area Aria3 having an illuminance of less than 3 lux.
[0026]
It can be seen from FIG. 5 that the lighting device 100 can secure a wide and uniform illuminance.
[0027]
Comparing this with the illuminance of the illuminating plane of the conventional directly below type illuminating device shown in FIG. 11, the illuminating device 100 according to the present embodiment shows that the illuminating small surface with the highest illuminance is about 10 lux, and The low illuminated facet is about 3 lux, while the illuminated flat face of a conventional directly below type illuminator has the illuminated facet with the highest illuminance at about 12 lux and the illuminated facet with the lowest illuminance at 0 lux. is there. That is, the illumination device 100 according to the present embodiment has a smaller difference between the maximum illuminance portion and the minimum illuminance portion, in other words, the illumination device 100 according to the present embodiment has an uneven irradiation plane K. It can be seen that the light was more uniformly irradiated.
[0028]
Further, as shown in FIG. 12, the illuminance of the conventional equiangular illumination device is about 11 lux at the highest, whereas it is about 5 lux at the lowest. However, it is clear from the comparison with FIG. 5 that the illumination device 100 according to the present embodiment has more irradiation small surfaces that can obtain an illuminance of about 10 lux. Therefore, it can be seen that the illumination device 100 according to the present embodiment irradiates the irradiation plane K evenly and evenly.
[0029]
In this conventional equiangular illumination device, the arrangement positions of all the light emitting diode elements A on the substrate B are the same as those according to the present embodiment, but the optical axes of the adjacent light emitting diode elements A are different. The difference between the angles formed by L and the vertical axis Y is all 5 °.
[0030]
Next, the lighting device 300 that illuminates the circular irradiation plane KC will be described.
In the case of such a lighting device 300, five concentric circles are formed on a circular substrate, and a total of 100 light-emitting diode elements a1 to a4, b1 to 4, 12, 20, 28, and 36 respectively. b12, c1 to c20, d1 to d28, and e1 to e36 are arranged. Then, the light-emitting diode elements b1 to 12b, c1 to c20, d1 to d28, and e1 to e36, which are located more outward than the angle formed by the optical axis and the vertical axis of the four most central light-emitting diode elements a1 to a4. The angle between the optical axis and the vertical axis is gradually increasing. The pole 310 to which the lighting element 300 is attached is erected at the center of the substrate.
[0031]
In this case, the irradiation plane KC is obtained by dividing five concentric circles having radii of 1 m, 2 m, 3 m, 4 m, and 5 m into 1, 12, 20, 28, and 36, respectively, as shown in FIG. The irradiation planes A1 to A4, B1 to B12, C1 to C20, D1 to D28, and E1 to E36 have the same area.
[0032]
When the pole 310 having a height of 7 m is provided at the center and the lighting device 300 is installed on the pole 310, an illuminance distribution as shown in FIG. 9 can be obtained. That is, the illuminance near the center of the irradiation face A directly below the lighting device 300 was about 0.55 lux or more, and about 0.3 lux at the outermost.
[0033]
To be more specific, a circular area Aria0.6 including 0.5 lux or more and less than 0.6 lux including the irradiation small surface A1, including the irradiation small surfaces A1, B1 to 12, C1 to C20, D1 to D28, and E1 to E36. , Including an annular area Aria0.5 outside the area Aria0.6 and less than 0.5 lux and less than 0.5 lux, the irradiation facets E1 to E36, and less than 0.4 lux outside the area Aria0.5. Each of the annular regions Aria0.4 is formed.
[0034]
As shown in FIG. 8, the light emitting diode element of the lighting device 300 has an angle θ1 between the optical axis of the light emitting diode element which is in charge of the irradiation facet close to the lighting device 300 and the vertical axis Y, and a farther irradiation facet. The angle θ2 between the optical axis of the light emitting diode element in charge and the vertical axis Y satisfies θ1 <θ2. Θ = 4.09 ° for light emitting diode element a1, θ = 12.99 ° for light emitting diode element b1, θ = 19.65 ° for light emitting diode element c1, θ = 26.57 ° for light emitting diode element d1, light emitting diode In the element e1, θ = 32.74 °.
[0035]
On the other hand, in a conventional lighting device, that is, a lighting device of a direct type, as shown in FIG. 13, a portion having the highest illuminance has about 10 lux and a portion having the lowest illuminance has 0 lux. Therefore, as compared with FIG. 10, it can be said that the illumination device 300 according to the present embodiment can obtain uniform illumination without unevenness in illumination, although the illumination device of the conventional direct-type illumination device has higher illuminance.
[0036]
In addition, as compared with FIG. 12 showing the illuminance distribution of the conventional isometric angle type lighting device, the conventional isometric angle type lighting device has higher illuminance, but the lighting device 300 according to the present embodiment has higher illuminance. However, it can be said that uniform illumination can be obtained without uneven illuminance.
[0037]
In the two embodiments described above, one light-emitting diode element irradiates one irradiation facet, but two or more light-emitting diode elements irradiate one irradiation facet. Is also good. In this case, it goes without saying that the overall illuminance can be improved.
[0038]
【The invention's effect】
A lighting device using a light-emitting diode element according to the present invention is a lighting device using a light-emitting diode element having a plurality of light-emitting diode elements, and has an equal irradiation area to which light from the light-emitting diode element is irradiated. When irradiating one irradiation facet with one or a plurality of light emitting diode elements and dividing the irradiation facet into a plurality of irradiation facets, one or more of the irradiation facets are assigned to a center position of the irradiation facet to be handled. The light axis of the light emitting diode element is oriented.
[0039]
Then, in the lighting device using this light emitting diode element, the difference in the angle between the optical axis and the vertical axis of each adjacent light emitting diode element is smaller in the light emitting diode element that irradiates a distant irradiation small surface. That is, unlike the related art, the light emitting diode element has an optical axis that is uniformly directed directly downward, and the light emitting diode element has a difference in angle between the optical axis and the vertical axis of an adjacent light emitting diode element.
The illuminance E of each irradiation facet is represented by E = Φ / A (where Φ is a light flux and A is an area), that is, the amount of light flux emitted by the light emitting diode element is incident on the irradiation facet. The illumination device using the diode element is also greatly different from the conventional illumination apparatus in that the light emitting diode element is configured so that the amount of light flux incident on the irradiation small surface is uniform. With such a configuration, there is a merit that the irradiation plane can be irradiated uniformly and evenly as a whole.
[Brief description of the drawings]
FIG. 1 is a schematic explanatory view showing an arrangement of light emitting diode elements of a lighting device using light emitting diode elements according to a first embodiment of the present invention.
FIG. 2 is a schematic diagram illustrating an irradiation plane and an irradiation small surface irradiated by a lighting device using the light emitting diode element according to the first embodiment of the present invention.
FIG. 3 is a schematic explanatory view showing an optical axis of a lighting device using the light emitting diode element according to the first embodiment of the present invention.
FIG. 4 is a schematic illuminance distribution diagram showing illuminance on an illumination plane of the illumination device using the light emitting diode element according to the first embodiment of the present invention.
FIG. 5 is a schematic illuminance graph showing illuminance on an illumination plane of the illumination device using the light emitting diode element according to the first embodiment of the present invention.
FIG. 6 is a schematic explanatory view showing an arrangement of light emitting diode elements of a lighting device using light emitting diode elements according to a second embodiment of the present invention.
FIG. 7 is a schematic explanatory diagram illustrating an irradiation plane and an irradiation small surface irradiated by a lighting device using a light-emitting diode element according to a second embodiment of the present invention.
FIG. 8 is a schematic explanatory view showing an optical axis of a lighting device using a light emitting diode element according to a second embodiment of the present invention.
FIG. 9 is a schematic illuminance distribution diagram showing illuminance on an irradiation plane of an illumination device using a light emitting diode element according to a second embodiment of the present invention.
FIG. 10 is a schematic illuminance graph showing illuminance on an illumination plane of an illuminating device using a light emitting diode element according to a second embodiment of the present invention.
FIG. 11 is a schematic diagram showing illuminance on an irradiation plane of a lighting device of a direct type using a conventional light emitting diode element for comparison with a lighting device using a light emitting diode element according to the first embodiment of the present invention. It is an illuminance graph.
FIG. 12 shows illuminance on an irradiation plane of an isometric angle type lighting device using a conventional light emitting diode element for comparison with a lighting device using a light emitting diode element according to the first embodiment of the present invention. It is a schematic illuminance graph.
FIG. 13 is a schematic diagram showing illuminance on an irradiation plane of a lighting device of a direct type using a conventional light emitting diode element for comparison with a lighting device using a light emitting diode element according to the second embodiment of the present invention. It is an illuminance graph.
FIG. 14 shows the illuminance on an irradiation plane of a lighting device of a regular angle type using a conventional light emitting diode element for comparison with a lighting apparatus using a light emitting diode element according to the second embodiment of the present invention. It is a schematic illuminance graph.
[Explanation of symbols]
Reference Signs List 100 lighting device using light emitting diode element 110 pole K irradiation planes A1 to E8 irradiation small face a1e8 light emitting diode element

Claims

In a lighting device using a light emitting diode element having a plurality of light emitting diode elements, an irradiation plane irradiated with light from the light emitting diode element is divided into a plurality of irradiation small surfaces having an equal area, and one or more light emitting diodes are provided. In the case where one irradiation facet is irradiated by the element, the optical axis of one or a plurality of light-emitting diode elements that are responsible for the irradiation facet is directed to the center position of the irradiation facet in charge. A lighting device using a diode element.