JP4140157B2 - Illumination light source and illumination device using light emitting diode - Google Patents
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Description
【０００１】
【発明の属する技術分野】
本発明は、一般照明用として好適な光源色を有する発光ダイオードを用いた照明用光源およびこれを用いた照明装置に関する。
【０００２】
【従来の技術】
発光ダイオードの発光効率が向上するとともに、３原色光であるところの赤色光、緑色光および青色光をそれぞれ効率高く発生する発光ダイオードが開発されたこともあって、従来蛍光ランプや白熱電球が主流の室内照明などの一般照明用光源として、省エネルギーおよび環境対策光源としての発光ダイオードの可能性が注目されるようになった。
【０００３】
現在、主として室内用の照明において使用されている主な光源色は、昼光色、昼白色および電球色である。昼光色は、相関色温度が６７００Ｋであり、昼白色は同じく５０００Ｋ、電球色は同じく３０００Ｋである。これらの光源色は、上記のように相関色温度で表現すると、数値に大きな差があるが、いずれもいわゆる白色系の光色すなわち白色光であるといえる。
【０００４】
ところで、光の３原色を混合すると、白色になるのは周知のとおりであり、３原色光を加法混色により白色光を得るに際して、赤色光、緑色光および青色光の光束比を加減することにより、所望の相関色温度の光源色を得ることができる。
【０００５】
一方、一般照明において、良質の照明を行うのに欠かせない指標として、演色性がある。この演色性は、「平均演色評価数Ｒａ」により評価するのが一般的である。そして、良質の照明を行うには、平均演色評価数Ｒａの値が大きい方がよい。演色性が良好であるとして普及している３波長域発光形の蛍光ランプにおいては、平均演色評価数Ｒａが８８以上であり、高演色形の蛍光ランプでは平均演色評価数Ｒａが９０〜９９である。
【０００６】
特開平１０−２０９５０４号公報には、３原色の発光ダイオードのピーク波長を規定することにより、演色性の良好な白色光を得るための一般照明システムが記載されている（従来技術１）。
【０００７】
また、特開平１１-１７７１４３号公報には、３原色光の発光ダイオードに加えて他の色光を発生する発光ダイオードを含めて混色を行うことにより、所望の相関色温度と良好な演色性とを備えた照明用光源が記載されている（従来技術２）。
【０００８】
【発明が解決しようとする課題】
しかし、従来技術１においては、所望の相関色温度を得ることができるものの、演色性は必ずしも十分に高くならない。
【０００９】
また、従来技術２においては、少なくとも４種類の発光ダイオードが必要であり、コストアップを避けられない。
【００１０】
ところが、発光ダイオードは、白熱電球や放電ランプに比較して、発光スペクトルが極端に狭いという白熱電球や蛍光ランプには見られない性質がある。
【００１１】
本発明は、上記発光ダイオードの特質に鑑み研究の結果なされたもので、赤色光、緑色光および青色光を発生する３種類の発光ダイオードを加法混色により白色光を得る場合に、各発光ダイオードのピーク波長を規定するだけでなく、光束比および半値幅をも規定することにより、所望の相関色温度と高い演色性とをともに満足することができることを見いだした。
【００１２】
本発明は、３原色の発光ダイオードを用いて所望の相関色温度でありながら、しかも９０以上に高い平均演色評価数Ｒａの白色光を有する発光ダイオードを用いた照明用光源およびこれを用いた照明装置を提供することを目的とする。
【００１３】
【課題を達成するための手段】
請求項１の発明の発光ダイオードを用いた照明用光源は、発光スペクトルのピーク波長が６０５〜６３５ｎｍの範囲内にある光を光束比で１６〜３１％発生し、かつ半値幅が１５〜６０ｎｍの赤色光を発生する第１の発光ダイオードと；発光スペクトルのピーク波長が５３０〜５７０ｎｍの範囲内にある光を光束比で４８〜７６％発生し、かつ半値幅が２０〜６０ｎｍの緑色光を発生する第２の発光ダイオードと；発光スペクトルのピーク波長が４５０〜４９０ｎｍの範囲内にある光を光束比で７〜３１％発生し、かつ半値幅が１５〜７０ｎｍの青色光を発生する第３の発光ダイオードと；を具備し、各色光が加法混色されて相関色温度が６５００Ｋ±１０％の白色光を得るように構成されていることを特徴としている。
【００１４】
本発明および以下の各発明において、特に指定しない限り用語の定義および技術的意味は次による。
【００１５】
「赤色光を発生する発光ダイオード」とは、ピーク波長が６０５〜６３５ｎｍの範囲内にある発光ダイオードをいう。請求項１の発明において、第１の発光ダイオードは、上記ピーク波長範囲で、かつ半値幅が１５〜６０ｎｍの赤色光を光束比で１６〜３１％発生する。
【００１６】
「緑色光を発生する発光ダイオード」とは、ピーク波長が５３０〜５７０ｎｍの範囲内にある発光ダイオードをいう。請求項１の発明において、第２の発光ダイオードは、上記ピーク波長範囲で、かつ半値幅が２０〜６０ｎｍの赤色光を光束比で４８〜７６％発生する。
【００１７】
「青色光を発生する発光ダイオード」とは、ピーク波長が４５０〜４９０ｎｍの範囲内にある発光ダイオードをいう。請求項１の発明において、第３の発光ダイオードは、上記ピーク波長範囲で、かつ半値幅が１５〜７０ｎｍの赤色光を光束比で７〜３１％発生する。
【００１８】
３原色発光の発光ダイオードのピーク波長は、好適な範囲を規定している。各色光の発光ダイオードは、それぞれ規定された範囲内であれば、いずれの値のピーク波長であってもよい。
【００１９】
光束比は、各色光ごとに光束比を積算したときに全部で１００％になる値である。
【００２０】
「半値幅」とは、発光ダイオードの発光スペクトルのピーク値の５０％における波長範囲であって、発光スペクトルの広がりを示す。
【００２１】
「加法混色される」とは、各色光の発光ダイオードの発光が混合されて被照明体に照射されるように構成されていることを意味する。異種の発光ダイオードが適当な間隔で配列されて光源を形成している場合、当該間隔の値より光源からの距離が明らかに大きい離間した位置にある被照明体には、発光ダイオードの配列に格別の配慮をしなくても、混合された照明光が照射される。したがって、異種発光の発光ダイオードの配列を格別配慮する必要はないが、光源製造上などの必要からある規則的な配列をすることができる。
【００２２】
本発明において、用いる発光ダイオードの数は各色光ごとに少なくとも１個である。所要の光量に応じて所望の数量を用いることができるまた、発光ダイオードは、リード線が導出しているランプタイプ、チップ部品化されているチップタイプ、ベアチップタイプなどがあるが、どのようなタイプであってもよい。
【００２３】
さらに、本発明においては、適当な形状を備えた基体を用いて、そこに所定の数の発光ダイオードを配列することにより、所定の消費電力の光源を得ることができる。
【００２４】
さらにまた、各発光ダイオードごとに小形の反射手段を形成しておくことにより、従来のたとえば蛍光ランプのように照明器具としての大きな反射板は不要になる。しかし、必要に応じて適当な共通の反射手段を光源が備えているか、またはおよび光源を装着する照明装置側に配設することもできる。
【００２５】
さらにまた、発光ダイオードは、適当な形状、材質および構造を備えた基体に支持されるように構成することができる。たとえば、直管、管形やＵ字形に湾曲または屈曲した汎用の蛍光ランプの形状に類似した形状や、照明器具の平面状または曲面状のカバーまたはグローブに類似した形状などの基体を用いて、その表面に発光ダイオードを配設することができる。
【００２６】
そうして、本発明においては、上記半値幅の範囲に含まれるとともに、発光スペクトルのピーク波長および光束比が所定の範囲に設定されている３原色発光の３種類の発光ダイオードを組み合わせることによって、６５００ K ±１０％の相関色温度の、いわゆる昼光色と称するやや青味のある光色の白色光で、すっきりとした白さを表現するのに好適な発光で、しかも平均演色評価数Ｒａが９０以上の優れた白色光の照明用光源を得ることができる。
【００２７】
請求項２の発明の発光ダイオードを用いた照明用光源は、発光スペクトルのピーク波長が６０５〜６３５ｎｍの範囲内にある光を光束比で１９〜２７％発生し、かつ半値幅が１５〜６０ｎｍの赤色光を発生する第１の発光ダイオードと；発光スペクトルのピーク波長が５３０〜５７０ｎｍの範囲内にある光を光束比で５２〜７５％発生し、かつ半値幅が２０〜６０ｎｍの緑色光を発生する第２の発光ダイオードと；発光スペクトルのピーク波長が４５０〜４９０ｎｍの範囲内にある光を光束比で５〜２４％発生し、かつ半値幅が１５〜７０ｎｍの青色光を発生する第３の発光ダイオードと；を具備し、各色光が加法混色されて相関色温度が５０００Ｋ±１０％の白色光を得るように構成されていることを特徴としている。
【００２８】
そうして、本発明においては、上記半値幅の範囲に含まれるとともに、発光スペクトルのピーク波長および光束比が所定の範囲に設定されている３原色発光の３種類の発光ダイオードを組み合わせることによって、５０００ K ±１０％の相関色温度の、いわゆる昼白色と称する昼光色および電球色の中間的な光色の発光で、しかも平均演色評価数Ｒａが９０以上の優れた白色光の照明用光源を得ることができる。
【００２９】
請求項３の発明の発光ダイオードを用いた照明用光源は、発光スペクトルのピーク波長が６０５〜６３５ｎｍの範囲内にある光を光束比で２４〜４０％発生し、かつ半値幅が１５〜６０ｎｍの赤色光を発生する第１の発光ダイオードと；発光スペクトルのピーク波長が５３０〜５７０ｎｍの範囲内にある光を光束比で３１〜６２％発生し、かつ半値幅が２０〜６０ｎｍの緑色光を発生する第２の発光ダイオードと；発光スペクトルのピーク波長が４５０〜４９０ｎｍの範囲内にある光を光束比で２〜１１％発生し、かつ半値幅が１５〜７０ｎｍの青色光を発生する第３の発光ダイオードと；を具備し、各色光が加法混色されて相関色温度が３０００Ｋ±１０％の白色光を得るように構成されていることを特徴としている。
【００３０】
そうして、本発明においては、上記半値幅の範囲に含まれるとともに、発光スペクトルのピーク波長および光束比が所定の範囲に設定されている３原色発光の３種類の発光ダイオードを組み合わせることによって、３０００ K ±１０％の相関色温度の、いわゆる電球色と称する白色光で、白熱電球のような暖かい光色が得られ、落ちつきと安らぎのある雰囲気をつくるのに好適な発光で、しかも平均演色評価数Ｒａが９０以上の優れた白色光の照明用光源を得ることができる。
【００３１】
請求項４の発明の照明装置は、照明装置本体と；照明装置本体に装着された請求項１ないし３のいずれか一記載の発光ダイオードを用いた照明用光源と；を具備していることを特徴としている。
【００３２】
本発明において、「照明装置」とは発光ダイオードを用いた照明用光源を光源とするあらゆる照明装置を含む広い概念である。たとえば、屋内用照明器具、屋外用照明器具、画像読取装置、表示装置など種々の用途において、その優れた効果を発揮する。
【００３３】
【発明の実施の形態】
以下、本発明の実施の形態を図面を参照して説明する。
【実施例１】
第１の発光ダイオード：ピーク波長が６２０ｎｍで、半値幅が１６．１ｎｍの赤色発光タイプ
第２の発光ダイオード：ピーク波長が５５０ｎｍで、半値幅が４８．０ｎｍの緑色発光タイプ
第３の発光ダイオード：ピーク波長が４７０ｎｍで、半値幅が６８．８ｎｍの青色発光タイプ
上記３原色発光の第１ないし第３の発光ダイオードを表１に示す光束比（％）で加法混色により３種類の相対色温度を備えた照明用光源を得た。
【００３４】
【表１】
相関色温度（Ｋ） 6500 5000 3000
平均演色評価数Ｒａ 95.2 94.3 91.3
光束比（％）
第１の発光ダイオード 20.67 22.88 32.12
第２の発光ダイオード 54.17 57.89 59.35
第３の発光ダイオード 25.16 19.24 8.24
図１は、本発明の発光ダイオードを用いた照明用光源の実施例１において、それぞれ異なる相対色温度を備えた３種類の照明用光源の分光分布を示すグラフである。
【００３５】
図において、横軸は波長（ｎｍ）を、縦軸は出力相対値を、それぞれ示す。また、曲線Ａは相関色温度６５００Ｋの照明用光源、曲線Ｂは相関色温度５０００Ｋの照明用光源、曲線Ｃは相関色温度３０００Ｋの照明用光源、をそれぞれ示す。
【実施例２】
第１の発光ダイオード：ピーク波長が６２０ｎｍで、半値幅が２４．５ｎｍの赤色発光タイプ
第２の発光ダイオード：ピーク波長が５５０ｎｍで、半値幅が３１．６ｎｍの緑色発光タイプ
第３の発光ダイオード：ピーク波長が４７０ｎｍで、半値幅が６８．８ｎｍの青色発光タイプ
上記３原色発光の第１ないし第３の発光ダイオードを表２に示す光束比（％）で加法混色により３種類の相関色温度を備えた照明用光源を得た。
【００３６】
【表２】
相関色温度（Ｋ） 6500 5000 3000
平均演色評価数Ｒａ 91.9 91.6 90.0
光束比（％）
第１の発光ダイオード 22.60 24.93 34.18
第２の発光ダイオード 52.04 55.62 57.08
第３の発光ダイオード 23.35 19.44 8.74
【実施例３】
第１の発光ダイオード：ピーク波長が６２０ｎｍで、半値幅が１６．１ｎｍの赤色発光タイプ
第２の発光ダイオード：ピーク波長が５４５ｎｍで、半値幅が４８．０ｎｍの緑色発光タイプ
第３の発光ダイオード：ピーク波長が４５５ｎｍで、半値幅が４９．２ｎｍの青色発光タイプ
上記３原色発光の第１ないし第３の発光ダイオードを表３に示す光束比（％）で加法混色により３種類の相対色温度を備えた照明用光源を得た。
【００３７】
【表３】
相関色温度（Ｋ） 6500 5000 3000
平均演色評価数Ｒａ 93.2 93.7 92.0
光束比（％）
第１の発光ダイオード 21.00 23.90 34.00
第２の発光ダイオード 68.30 68.00 62.40
第３の発光ダイオード 10.70 8.20 3.60
図２は、本発明の照明装置の一実施形態を示す概念図である。
【００３８】
図において、１は照明器具本体、２は発光ダイオードを用いた照明用光源である。
【００３９】
照明器具本体１は、円盤状をなしていて、内部に整流装置、ソケットその他照明用光源２を点灯するのに必要な部品類が配設されている。
【００４０】
発光ダイオードを用いた照明用光源２は、本発明の実施例１ないし３のいずれか一が用いられる。この光源２は、加法に突出した球面の一部をなす形状の基体２ａの外面に複数の発光ダイオード２ｂが配設されている。照明装置本体１に対して、発光ダイオードを用いた照明用光源２はソケットを介して着脱自在に装着されている。
【００４１】
【発明の効果】
【００４２】
請求項１の発明によれば、第１の発光ダイオードのピーク波長が６０５〜６３５ｎｍの範囲内にあり、光束比が１６〜３１％で、半値幅が１５〜６０ｎｍ、第２の発光ダイオードのピーク波長が５３０〜５７０ｎｍの範囲内にあり、光束比が４８〜７６％で、半値幅が２０〜６０ｎｍ、第３の発光ダイオードのピーク波長が４５０〜４９０ｎｍの範囲内にあり、光束比が７〜３１％で、半値幅が１５〜７０ｎｍであるとともに、相関色温度が６５００Ｋ±１０％であることにより、光源色が昼光色で平均演色評価数Ｒａが９０以上に高い発光ダイオードを用いた照明用光源を提供することができる。
【００４３】
請求項２の発明によれば、第１の発光ダイオードのピーク波長が６０５〜６３５ｎｍの範囲内にあり、光束比が１９〜２７％で、半値幅が１５〜６０ｎｍ、第２の発光ダイオードのピーク波長が５３０〜５７０ｎｍの範囲内にあり、光束比が５２〜７５％で、半値幅が２０〜６０ｎｍ、第３の発光ダイオードのピーク波長が４５０〜４９０ｎｍの範囲内にあり、光束比が５〜２４％で、半値幅が１５〜７０ｎｍであるとともに、相対色温度が５０００Ｋ±１０％であることにより、光源色が昼白色で平均演色評価数Ｒａが９０以上に高い発光ダイオードを用いた照明用光源を提供することができる。
【００４４】
請求項３の発明によれば、第１の発光ダイオードのピーク波長が６０５〜６３５ｎｍの範囲内にあり、光束比が２４〜４０％で、第２の発光ダイオードのピーク波長が５３０〜５７０ｎｍの範囲内にあり、光束比が３１〜６２％で、半値幅が２０〜６０ｎｍ、第３の発光ダイオードのピーク波長が４５０〜４９０ｎｍの範囲内にあり、光束比が２〜１１％で、半値幅が１５〜７０ｎｍであるとともに、相関色温度が３０００Ｋ±１０％であることにより、光源色が電球色で平均演色評価数Ｒａが９０以上に高い発光ダイオードを用いた照明用光源を提供することができる。
【００４５】
請求項４の発明によれば、請求項１ないし３の効果を有する照明装置を提供することができる。
【図面の簡単な説明】
【図１】 本発明の発光ダイオードを用いた照明用光源の実施例１において、それぞれ異なる相関色温度を備えた３種類の照明用光源の分光分布を示すグラフ
【図２】 本発明の照明装置の一実施形態を示す概念図
【符号の説明】
Ａ…相関色温度６５００Ｋの照明用光源
Ｂ…相関色温度５０００Ｋの照明用光源
Ｃ…相関色温度３０００Ｋの照明用光源[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an illumination light source using a light emitting diode having a light source color suitable for general illumination, and an illumination device using the illumination light source.
[0002]
[Prior art]
Fluorescent lamps and incandescent light bulbs have been mainly used in the past due to the development of light emitting diodes that generate red light, green light, and blue light, which are the three primary colors, with high efficiency. As light sources for general lighting such as indoor lighting, the possibility of light-emitting diodes as energy-saving and environmentally-friendly light sources has been noticed.
[0003]
At present, the main light source colors mainly used in indoor lighting are daylight color, daylight white color and light bulb color. The daylight color has a correlated color temperature of 6700K, the daylight white is also 5000K, and the bulb color is also 3000K. When these light source colors are expressed by the correlated color temperature as described above, there is a large difference in numerical values, but it can be said that any of these light source colors is a so-called white light color, that is, white light.
[0004]
By the way, it is well known that when the three primary colors of light are mixed, white is obtained. When white light is obtained by additive color mixing of the three primary colors, the luminous flux ratio of red light, green light and blue light is adjusted. A light source color having a desired correlated color temperature can be obtained.
[0005]
On the other hand, in general lighting, color rendering is an index that is indispensable for providing high-quality lighting. This color rendering is generally evaluated by “average color rendering index Ra”. And in order to perform high quality illumination, it is better that the value of the average color rendering index Ra is large. The average color rendering index Ra is 88 or more in a three-wavelength light emitting fluorescent lamp that is popular as having good color rendering, and the average color rendering index Ra is 90 to 99 in a high color rendering fluorescent lamp. is there.
[0006]
Japanese Patent Application Laid-Open No. 10-209504 describes a general illumination system for obtaining white light with good color rendering by defining peak wavelengths of light emitting diodes of three primary colors (prior art 1) .
[0007]
Japanese Patent Laid-Open No. 11-177143 discloses a desired correlated color temperature and good color rendering by performing color mixing including light emitting diodes that generate other color light in addition to light emitting diodes of three primary colors. The illumination light source provided is described (prior art 2) .
[0008]
[Problems to be solved by the invention]
However, in the related art 1, although a desired correlated color temperature can be obtained, the color rendering properties are not necessarily sufficiently high.
[0009]
Moreover, in the prior art 2, at least four types of light emitting diodes are necessary, and an increase in cost is inevitable.
[0010]
However, light-emitting diodes have a property that is not seen in incandescent bulbs and fluorescent lamps because the emission spectrum is extremely narrow compared to incandescent bulbs and discharge lamps.
[0011]
The present invention has been made the result of research in view of the characteristics of the light-emitting diode, in the case of obtaining white light three kinds of light-emitting diode generating red light, green light and blue light by additive color mixing, the respective light emitting diodes It has been found that not only the peak wavelength but also the luminous flux ratio and the half width can be specified to satisfy both the desired correlated color temperature and the high color rendering.
[0012]
The present invention relates to an illumination light source using a light emitting diode having white light having an average color rendering index Ra of 90 or more while having a desired correlated color temperature using light emitting diodes of three primary colors, and illumination using the same An object is to provide an apparatus.
[0013]
[Means for achieving the object]
The illumination light source using the light-emitting diode according to the first aspect of the invention generates light having a peak wavelength of the emission spectrum in the range of 605 to 635 nm in a luminous flux ratio of 16 to 31% and a half-value width of 15 to 60 nm. A first light emitting diode for generating red light; light having a peak wavelength of an emission spectrum in the range of 530 to 570 nm is generated in a luminous flux ratio of 48 to 76%, and green light having a half width of 20 to 60 nm is generated. A second light emitting diode that generates light having a peak wavelength of emission spectrum in the range of 450 to 490 nm in a luminous flux ratio of 7 to 31% and blue light having a half width of 15 to 70 nm. A light-emitting diode, and each color light is additively mixed to obtain white light having a correlated color temperature of 6500 K ± 10% .
[0014]
In the present invention and each of the following inventions, the definitions and technical meanings of terms are as follows unless otherwise specified.
[0015]
A “light emitting diode that generates red light” refers to a light emitting diode having a peak wavelength in the range of 605 to 635 nm. In the first aspect of the invention, the first light emitting diode generates 16 to 31% of red light having a luminous flux ratio in the peak wavelength range and having a half width of 15 to 60 nm.
[0016]
“Light-emitting diode generating green light” refers to a light-emitting diode having a peak wavelength in the range of 530 to 570 nm. In the first aspect of the invention, the second light emitting diode generates 48 to 76% of the red light having a light flux ratio in the peak wavelength range and having a half width of 20 to 60 nm.
[0017]
The “light emitting diode that generates blue light” refers to a light emitting diode having a peak wavelength in the range of 450 to 490 nm. In the first aspect of the present invention, the third light emitting diode generates 7 to 31% of red light in the peak wavelength range and having a full width at half maximum of 15 to 70 nm in terms of a luminous flux ratio.
[0018]
The peak wavelength of the light emitting diode emitting three primary colors defines a preferable range. The light emitting diode of each color light may have any value of peak wavelength as long as it is within a specified range.
[0019]
The luminous flux ratio is a value that becomes 100% in total when the luminous flux ratio is integrated for each color light.
[0020]
The “half-value width” is a wavelength range at 50% of the peak value of the emission spectrum of the light emitting diode, and indicates the spread of the emission spectrum.
[0021]
“Additive color mixing” means that the light emitted from the light emitting diodes of each color light is mixed and applied to the object to be illuminated. When different types of light emitting diodes are arranged at an appropriate interval to form a light source, an object to be illuminated at a position where the distance from the light source is clearly larger than the value of the interval is exceptionally different from the arrangement of the light emitting diodes. Even if this is not taken into consideration, the mixed illumination light is irradiated. Therefore, it is not necessary to give special consideration to the arrangement of the light emitting diodes of different types of light emission, but a regular arrangement can be made because of the necessity for manufacturing the light source.
[0022]
In the present invention, the number of light emitting diodes used is at least one for each color light. The desired quantity can be used according to the required light quantity. Also, there are various types of light emitting diodes, such as the lamp type from which the lead wire is led out, the chip type formed as a chip component, and the bare chip type. It may be.
[0023]
Furthermore, in the present invention, a light source having a predetermined power consumption can be obtained by arranging a predetermined number of light emitting diodes on a substrate having an appropriate shape.
[0024]
Furthermore, by forming a small reflecting means for each light emitting diode, a large reflector as a lighting fixture such as a conventional fluorescent lamp becomes unnecessary. However, if necessary, the light source may be provided with an appropriate common reflecting means, or may be disposed on the side of the lighting device to which the light source is attached.
[0025]
Furthermore, the light emitting diode can be configured to be supported by a substrate having an appropriate shape, material, and structure. For example, by using a substrate such as a straight tube, a shape similar to the shape of a general-purpose fluorescent lamp curved or bent into a tube shape or a U shape, or a shape similar to a flat or curved cover or globe of a lighting fixture, A light emitting diode can be arranged on the surface.
[0026]
Thus, in the present invention, by combining three types of light emitting diodes that emit light of three primary colors that are included in the range of the half width and the peak wavelength and luminous flux ratio of the emission spectrum are set in a predetermined range, of 6500 K ± 10% of the correlated color temperature, a white light of the light color slightly a bluish called so-called daylight, in a suitable emission to represent neat whiteness, yet the average color rendering index Ra is 90 Ru can Rukoto obtain an illumination light source for more excellent white light.
[0027]
The illumination light source using the light emitting diode of the invention of claim 2 generates light having a peak wavelength of the emission spectrum in the range of 605 to 635 nm in a luminous flux ratio of 19 to 27 % , and a half width of 15 to 60 nm. A first light emitting diode for generating red light ; light having a peak wavelength of an emission spectrum in the range of 530 to 570 nm is generated in a luminous flux ratio of 52 to 75% , and green light having a half width of 20 to 60 nm is generated. A second light emitting diode that generates light having a peak wavelength of an emission spectrum in a range of 450 to 490 nm in a luminous flux ratio of 5 to 24% and a blue light having a half width of 15 to 70 nm. A light emitting diode ; and each color light is additively mixed to obtain white light having a correlated color temperature of 5000 K ± 10%.
[0028]
Thus, in the present invention, by combining three types of light emitting diodes that emit light of three primary colors that are included in the range of the half width and the peak wavelength and luminous flux ratio of the emission spectrum are set in a predetermined range, An excellent light source for illumination of white light having a correlated color temperature of 5000 K ± 10% and having an intermediate light color between so-called daylight color and light bulb color called so-called white color , and an average color rendering index Ra of 90 or more is obtained. Rukoto is Ru can.
[0029]
The light source for illumination using the light emitting diode of the invention of claim 3 generates light having a peak wavelength of the emission spectrum in a range of 605 to 635 nm in a luminous flux ratio of 24 to 40% and a half width of 15 to 60 nm. A first light emitting diode for generating red light ; light having a peak wavelength of the emission spectrum in the range of 530 to 570 nm is generated in a light flux ratio of 31 to 62% , and green light having a half width of 20 to 60 nm is generated. A second light emitting diode that generates light having a peak wavelength of an emission spectrum in the range of 450 to 490 nm in a luminous flux ratio of 2 to 11% and a blue light having a half width of 15 to 70 nm. A light emitting diode ; and each color light is additively mixed to obtain white light having a correlated color temperature of 3000 K ± 10%.
[0030]
Thus, in the present invention, by combining three types of light emitting diodes that emit light of three primary colors that are included in the range of the half width and the peak wavelength and luminous flux ratio of the emission spectrum are set in a predetermined range, White light with a correlated color temperature of 3000 K ± 10%, the so-called light bulb color, produces a warm light color like an incandescent light bulb, suitable emission to create a calm and peaceful atmosphere , and average color rendering index Ra is Ru can Rukoto obtain an illumination light source with excellent
[0031]
A lighting device according to a fourth aspect of the present invention comprises: a lighting device main body; and an illumination light source using the light emitting diode according to any one of claims 1 to 3 attached to the lighting device main body. It is a feature.
[0032]
In the present invention, “illumination device” is a broad concept including all illumination devices that use a light source for illumination using a light emitting diode as a light source. For example, it exhibits excellent effects in various uses such as indoor lighting fixtures, outdoor lighting fixtures, image reading devices, and display devices.
[0033]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[Example 1]
First light emitting diode: red light emitting type having a peak wavelength of 620 nm and a half width of 16.1 nm Second light emitting diode: green light emitting type having a peak wavelength of 550 nm and a half width of 48.0 nm Third light emitting diode: Blue light-emitting type with a peak wavelength of 470 nm and a half-value width of 68.8 nm The first to third light-emitting diodes emitting the three primary colors emit three relative color temperatures by additive color mixing at the luminous flux ratio (%) shown in Table 1. The illumination light source provided was obtained.
[0034]
[Table 1]
Correlated color temperature (K) 6500 5000 3000
Average color rendering index Ra 95.2 94.3 91.3
Luminous flux ratio (%)
First light emitting diode 20.67 22.88 32.12
Second light emitting diode 54.17 57.89 59.35
Third light emitting diode 25.16 19.24 8.24
FIG. 1 is a graph showing the spectral distribution of three types of illumination light sources each having a different relative color temperature in Example 1 of the illumination light source using the light emitting diode of the present invention.
[0035]
In the figure, the horizontal axis indicates the wavelength (nm), and the vertical axis indicates the output relative value. Curve A represents an illumination light source having a correlated color temperature of 6500K, curve B represents an illumination light source having a correlated color temperature of 5000K, and curve C represents an illumination light source having a correlated color temperature of 3000K.
[Example 2]
First light emitting diode: red light emitting type with a peak wavelength of 620 nm and half width of 24.5 nm Second light emitting diode: green light emitting type with a peak wavelength of 550 nm and half width of 31.6 nm Third light emitting diode: Blue light emitting type with a peak wavelength of 470 nm and a half width of 68.8 nm The above three primary color emitting first to third light emitting diodes are subjected to additive color mixing with three luminous flux ratios (%) shown in Table 2 to obtain three types of correlated color temperatures. The illumination light source provided was obtained.
[0036]
[Table 2]
Correlated color temperature (K) 6500 5000 3000
Average color rendering index Ra 91.9 91.6 90.0
Luminous flux ratio (%)
First light emitting diode 22.60 24.93 34.18
Second light emitting diode 52.04 55.62 57.08
Third light emitting diode 23.35 19.44 8.74
[Example 3]
First light emitting diode: red light emitting type having a peak wavelength of 620 nm and a half width of 16.1 nm Second light emitting diode: green light emitting type having a peak wavelength of 545 nm and a half width of 48.0 nm Third light emitting diode: Blue light emitting type with a peak wavelength of 455 nm and a half width of 49.2 nm The above three primary color emitting first to third light emitting diodes are subjected to additive color mixing at three luminous flux ratios (%) shown in Table 3 to obtain three types of relative color temperatures. The illumination light source provided was obtained.
[0037]
[Table 3]
Correlated color temperature (K) 6500 5000 3000
Average color rendering index Ra 93.2 93.7 92.0
Luminous flux ratio (%)
First light emitting diode 21.00 23.90 34.00
Second light emitting diode 68.30 68.00 62.40
Third light emitting diode 10.70 8.20 3.60
FIG. 2 is a conceptual diagram showing an embodiment of the illumination device of the present invention.
[0038]
In the figure, 1 is a lighting fixture body, and 2 is an illumination light source using a light emitting diode.
[0039]
The luminaire main body 1 has a disk shape, and a rectifier, a socket, and other parts necessary for lighting the illumination light source 2 are disposed therein.
[0040]
Any one of Embodiments 1 to 3 of the present invention is used as an illumination light source 2 using a light emitting diode. In the light source 2, a plurality of light emitting diodes 2 b are arranged on the outer surface of a base body 2 a that is a part of a spherical surface protruding in an additive manner. An illumination light source 2 using a light emitting diode is detachably attached to the illumination device body 1 via a socket.
[0041]
【The invention's effect】
[0042]
According to the invention of claim 1 , the peak wavelength of the first light emitting diode is in the range of 605 to 635 nm , the luminous flux ratio is 16 to 31% , the half width is 15 to 60 nm , and the peak of the second light emitting diode. The wavelength is in the range of 530 to 570 nm , the luminous flux ratio is 48 to 76% , the full width at half maximum is 20 to 60 nm , the peak wavelength of the third light emitting diode is in the range of 450 to 490 nm, and the luminous flux ratio is 7 to 31% , half-width is 15 to 70 nm and correlated color temperature is 6500 K ± 10%, so that the light source color is daylight and the average color rendering index Ra is 90 or more. Can be provided.
[0043]
According to the invention of claim 2 , the peak wavelength of the second light emitting diode is such that the peak wavelength of the first light emitting diode is in the range of 605 to 635 nm , the luminous flux ratio is 19 to 27 % , the half width is 15 to 60 nm . The wavelength is in the range of 530 to 570 nm , the luminous flux ratio is 52 to 75% , the half width is 20 to 60 nm , the peak wavelength of the third light emitting diode is in the range of 450 to 490 nm, and the luminous flux ratio is 5 to 5%. 24% , half width is 15 to 70 nm, and relative color temperature is 5000 K ± 10%, so that the light source color is daylight white and the average color rendering index Ra is 90 or more. A light source can be provided.
[0044]
According to the invention of claim 3 , the peak wavelength of the first light emitting diode is in the range of 605 to 635 nm , the luminous flux ratio is 24 to 40% , and the peak wavelength of the second light emitting diode is in the range of 530 to 570 nm. located within, in the light flux ratio of 31 to 62%,
[0045]
According to invention of Claim 4, the illuminating device which has the effect of Claims 1 thru | or 3 can be provided.
[Brief description of the drawings]
FIG. 1 is a graph showing spectral distributions of three types of illumination light sources having different correlated color temperatures in Example 1 of an illumination light source using a light emitting diode of the present invention. Schematic diagram illustrating an embodiment of the present invention
A: Illumination light source with correlated color temperature 6500K B: Illumination light source with correlated color temperature 5000K C: Illumination light source with correlated color temperature 3000K
Claims (4)
発光スペクトルのピーク波長が５３０〜５７０ｎｍの範囲内にある光を光束比で４８〜７６％発生し、かつ半値幅が２０〜６０ｎｍの緑色光を発生する第２の発光ダイオードと；
発光スペクトルのピーク波長が４５０〜４９０ｎｍの範囲内にある光を光束比で７〜３１％発生し、かつ半値幅が１５〜７０ｎｍの青色光を発生する第３の発光ダイオードと；
を具備し、各色光が加法混色されて相関色温度が６５００Ｋ±１０％の白色光を得るように構成されていることを特徴とする発光ダイオードを用いた照明用光源。A first light emitting diode that generates red light having a peak wavelength of an emission spectrum in a range of 605 to 635 nm in a luminous flux ratio of 16 to 31% and a half width of 15 to 60 nm;
A second light emitting diode that generates 48 to 76% of light having a peak wavelength of an emission spectrum in the range of 530 to 570 nm in a luminous flux ratio of 48 to 76% and green light having a half width of 20 to 60 nm;
A third light emitting diode that generates light having a peak wavelength of an emission spectrum in the range of 450 to 490 nm in a luminous flux ratio of 7 to 31% and blue light having a half width of 15 to 70 nm;
A light source for illumination using a light-emitting diode, characterized in that each color light is additively mixed to obtain white light having a correlated color temperature of 6500 K ± 10% .
発光スペクトルのピーク波長が５３０〜５７０ｎｍの範囲内にある光を光束比で５２〜７５％発生し、かつ半値幅が２０〜６０ｎｍの緑色光を発生する第２の発光ダイオードと；
発光スペクトルのピーク波長が４５０〜４９０ｎｍの範囲内にある光を光束比で５〜２４％発生し、かつ半値幅が１５〜７０ｎｍの青色光を発生する第３の発光ダイオードと；
を具備し、各色光が加法混色されて相関色温度が５０００Ｋ±１０％の白色光を得るように構成されていることを特徴とする発光ダイオードを用いた照明用光源。 A first light emitting diode that emits red light having a peak wavelength of an emission spectrum in a range of 605 to 635 nm in a luminous flux ratio of 19 to 27 % and a half width of 15 to 60 nm ;
A second light emitting diode that emits green light having a peak wavelength of an emission spectrum within a range of 530 to 570 nm and a light beam ratio of 52 to 75% and a half width of 20 to 60 nm ;
A third light emitting diode that emits light having a peak wavelength of an emission spectrum in the range of 450 to 490 nm in a luminous flux ratio of 5 to 24% and blue light having a half width of 15 to 70 nm ;
A light source for illumination using a light-emitting diode, characterized in that each color light is additively mixed to obtain white light having a correlated color temperature of 5000 K ± 10%.
発光スペクトルのピーク波長が５３０〜５７０ｎｍの範囲内にある光を光束比で３１〜６２％発生し、かつ半値幅が２０〜６０ｎｍの緑色光を発生する第２の発光ダイオードと；
発光スペクトルのピーク波長が４５０〜４９０ｎｍの範囲内にある光を光束比で２〜１１％発生し、かつ半値幅が１５〜７０ｎｍの青色光を発生する第３の発光ダイオードと；
を具備し、各色光が加法混色されて相関色温度が３０００Ｋ±１０％の白色光を得るように構成されていることを特徴とする発光ダイオードを用いた照明用光源。 A first light emitting diode that emits red light having a peak wavelength of an emission spectrum in a range of 605 to 635 nm in a luminous flux ratio of 24 to 40% and a half width of 15 to 60 nm ;
A second light emitting diode that emits green light having a peak wavelength of an emission spectrum within a range of 530 to 570 nm and a light flux ratio of 31 to 62% and a half width of 20 to 60 nm ;
A third light emitting diode that emits light having a peak wavelength of an emission spectrum in the range of 450 to 490 nm in a luminous flux ratio of 2 to 11% and blue light having a half width of 15 to 70 nm ;
A light source for illumination using a light-emitting diode, characterized in that each color light is additively mixed to obtain white light having a correlated color temperature of 3000 K ± 10%.
照明装置本体に装着された請求項１ないし３のいずれか一記載の発光ダイオードを用いた照明用光源と；
を具備していることを特徴とする照明装置。A lighting device body;
A light source for illumination using the light-emitting diode according to any one of claims 1 to 3 , which is mounted on a lighting device body;
An illumination device comprising:
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| JP37471699A JP4140157B2 (en) | 1999-12-28 | 1999-12-28 | Illumination light source and illumination device using light emitting diode |
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| JP (1) | JP4140157B2 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10216394B3 (en) * | 2002-04-12 | 2004-01-08 | Osram Opto Semiconductors Gmbh | LED module |
| JP5415664B2 (en) * | 2005-12-22 | 2014-02-12 | パナソニック株式会社 | Light source device |
| KR100858641B1 (en) * | 2008-01-08 | 2008-09-16 | 유항재 | Adapter for Compact Fluorescence Lamp having a Function of Protecting Eye Sight |
| JP5340879B2 (en) | 2009-10-13 | 2013-11-13 | スタンレー電気株式会社 | Light emitting device |
| JP5799212B2 (en) * | 2010-09-21 | 2015-10-21 | パナソニックＩｐマネジメント株式会社 | Light emitting module, backlight device and display device |
| JP2012155907A (en) * | 2011-01-24 | 2012-08-16 | Panasonic Corp | Lighting system |
| CN102853283A (en) * | 2011-06-30 | 2013-01-02 | 展晶科技(深圳)有限公司 | Light emitting diode lighting device |
| DE102013108782B4 (en) * | 2012-11-21 | 2024-05-08 | Epistar Corp. | Light emitting device with multiple light emitting stack layers |
| KR102191211B1 (en) | 2014-02-28 | 2020-12-15 | 서울반도체 주식회사 | Light emitting diode package |
| WO2015130055A2 (en) * | 2014-02-28 | 2015-09-03 | 서울반도체 주식회사 | Light-emitting diode package |
| JP6455817B2 (en) | 2014-09-12 | 2019-01-23 | パナソニックＩｐマネジメント株式会社 | Lighting device |
| CN107110446B (en) | 2015-01-31 | 2019-11-08 | 株式会社Lg化学 | Back light unit and display device including it |
| KR101694702B1 (en) * | 2015-04-21 | 2017-01-11 | 우리이앤엘 주식회사 | Led light source unit and backlight assembly using the same |
| JP6655809B2 (en) | 2015-06-19 | 2020-02-26 | パナソニックＩｐマネジメント株式会社 | Lighting equipment and lighting equipment |
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1999
- 1999-12-28 JP JP37471699A patent/JP4140157B2/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| JP2001184910A (en) | 2001-07-06 |
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