JP4770199B2 - Illumination light source, illumination device, and display device - Google Patents

Illumination light source, illumination device, and display device Download PDF

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JP4770199B2
JP4770199B2 JP2005056317A JP2005056317A JP4770199B2 JP 4770199 B2 JP4770199 B2 JP 4770199B2 JP 2005056317 A JP2005056317 A JP 2005056317A JP 2005056317 A JP2005056317 A JP 2005056317A JP 4770199 B2 JP4770199 B2 JP 4770199B2
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得志 山内
博生 川南
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パナソニック電工株式会社
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本発明は、複数の発光素子を用いた照明光源、照明装置、及び表示装置に関する。   The present invention relates to an illumination light source, an illumination device, and a display device using a plurality of light emitting elements.
昨今のLED(Light Emitting Diode)発光素子の大幅な性能向上を受け、従来から用いられている白熱電球、蛍光ランプなどの光源に替わり、LED発光素子を用いたLED照明光源の研究が進んでいる。また、照明器具、看板・サイン、表示装置などLED照明光源を用いた用途展開も進んでいる。LED発光素子を光源とした照明器具では、器具に対する視感的評価を鑑みて、照明器具の光の出射面において、輝度ばらつき、光量むらを極力抑えることが要求されている。   In response to the significant performance improvement of LED (Light Emitting Diode) light emitting devices in recent years, research on LED illumination light sources using LED light emitting devices is progressing instead of conventional light sources such as incandescent bulbs and fluorescent lamps. . In addition, application development using LED illumination light sources such as lighting fixtures, signboards / signs, and display devices is also progressing. In a lighting fixture using an LED light-emitting element as a light source, in view of visual evaluation of the fixture, it is required to suppress variations in luminance and unevenness of light as much as possible on the light emission surface of the lighting fixture.
図13は、背景技術に係る照明器具の外観を示す斜視図である。また、図14は、図13に示す照明器具の断面図である。図14に示す照明器具101は、略円筒形状の筐体102の略中央部に、複数の白色LED発光素子103を備えたLED光源ユニット104が配設されており、LED光源ユニット104を覆うようにセード部材105が筐体102に取り付けられている。   FIG. 13 is a perspective view illustrating an appearance of a lighting fixture according to the background art. FIG. 14 is a cross-sectional view of the lighting fixture shown in FIG. In the lighting fixture 101 shown in FIG. 14, an LED light source unit 104 including a plurality of white LED light emitting elements 103 is disposed at a substantially central portion of a substantially cylindrical housing 102 so as to cover the LED light source unit 104. Further, a shade member 105 is attached to the housing 102.
セード部材105は、LED光源ユニット104から出射された光を多方向に拡散させるもので、例えばガラスを用いて構成されており、セード部材105におけるLED光源ユニット104からの光が入射する面(セード部材105内面)には表面を弗化水素等によりエッチングして微細な凹凸をつけるフロスト処理が施され、セード部材105における光を出射する面(セード部材105外面)には鎚目加工が施されている。あるいは、セード部材105として、アクリル等の樹脂材料に拡散材料を混入して透過性を低減させたいわゆる乳白色パネルが用いられている。   The shade member 105 diffuses light emitted from the LED light source unit 104 in multiple directions, and is made of, for example, glass. The surface of the shade member 105 on which light from the LED light source unit 104 is incident (sade The inner surface of the member 105 is subjected to a frost process for etching the surface with hydrogen fluoride or the like to give fine irregularities, and the surface of the shade member 105 that emits light (the outer surface of the shade member 105) is subjected to a grid pattern process. ing. Alternatively, as the shade member 105, a so-called milky white panel in which a diffusing material is mixed into a resin material such as acrylic to reduce permeability is used.
そして、LED光源ユニット104から出射された光は、セード部材105に施されたフロスト処理や鎚目加工によって、拡散、屈折され、拡散光としてセード部材105から外部に出射される。これにより、セード部材105から出射される光は、LED光源ユニット104における複数のLED発光素子103による輝度ばらつきが低減され、セード部材105表面において均一な拡散光にされて照明に用いられるようになっている。   Then, the light emitted from the LED light source unit 104 is diffused and refracted by the frost processing and the grid processing applied to the shade member 105, and is emitted to the outside as diffused light from the shade member 105. As a result, the light emitted from the shade member 105 is reduced in luminance variation due to the plurality of LED light emitting elements 103 in the LED light source unit 104 and is made uniform diffused light on the surface of the shade member 105 and used for illumination. ing.
図15は、背景技術に係る表示装置の断面図である。図15に示す表示装置111は、例えば、制御盤などに用いられる照光式押しボタンスイッチや、情報伝達するための表示灯であり、一方面が開口された略箱形の筐体112の底部に、青色波長の光を発光する複数のLED発光素子を備えたLED光源ユニット113が設置されている。また、筐体112の開口部には、開口部を塞ぐようにプリズムシート114、蛍光板115、拡散板116、記名板117、及びカバープレート118を備えている。   FIG. 15 is a cross-sectional view of a display device according to the background art. A display device 111 shown in FIG. 15 is, for example, an illuminated pushbutton switch used for a control panel or the like, or an indicator lamp for transmitting information, and is provided at the bottom of a substantially box-shaped housing 112 having one side opened. An LED light source unit 113 including a plurality of LED light emitting elements that emit light of blue wavelength is installed. The opening of the housing 112 includes a prism sheet 114, a fluorescent plate 115, a diffusion plate 116, a name plate 117, and a cover plate 118 so as to close the opening.
プリズムシート114におけるLED光源ユニット113と反対側の出射面には、直交した3面を有するコーナーキューブ形状の微小な複数のプリズムが隙間無く形成されており、LED光源ユニット113からの光がプリズムシート114によって分散されて均一化されて蛍光板115に与えられる。蛍光板115には、青色波長の光を受光して黄色波長の光を発光する蛍光材料が混入されており、LED光源ユニット113からの光を蛍光板115に入射させることによって白色の表示用の光が得られるようになっている。   On the exit surface of the prism sheet 114 opposite to the LED light source unit 113, a plurality of small corner cube-shaped prisms having three orthogonal surfaces are formed without gaps, and the light from the LED light source unit 113 is transmitted to the prism sheet. 114 is dispersed and made uniform by the fluorescent plate 115. The fluorescent plate 115 is mixed with a fluorescent material that receives blue wavelength light and emits yellow wavelength light. When light from the LED light source unit 113 is incident on the fluorescent plate 115, white display light is emitted. It has come to be obtained.
そして、表示装置111において、LED光源ユニット113が備えるLED発光素子の発光面積は、表示灯開口部の面積に比べて非常に小さいため、表示灯の表示面において光量むらをなくすために、プリズムシート114でLED光源ユニット113が出射する光を分散させ、さらに拡散板116で光を拡散させて出射することにより、例えば表示装置111を制御盤などに用いられる照光式押しボタンスイッチや、情報伝達するための表示灯等に用いた場合において、LED発光素子を用いて、表示面または投光面上の光量をむら無く、均一に照射することができる。
特開平10−274947号公報
In the display device 111, the light emitting area of the LED light emitting element included in the LED light source unit 113 is very small compared to the area of the opening of the indicator lamp. Therefore, in order to eliminate unevenness in the amount of light on the display surface of the indicator lamp, the prism sheet In 114, the light emitted from the LED light source unit 113 is dispersed, and further, the light is diffused and emitted by the diffusion plate 116, so that, for example, an illumination type push button switch used for a control panel or the like is used. When used for a display lamp or the like, the LED light emitting element can be used to uniformly irradiate the light amount on the display surface or the light projection surface.
JP-A-10-274947
ところで、上述の照明器具101のように、セード部材105にフロスト処理を施したり、セード部材105として樹脂に拡散材料を混入した乳白色パネルを用いて光を拡散する場合には、セード部材105を光が通過する際に、フロスト処理部や乳白色パネルで光が吸収され損失が生じる。一方、セード部材105での光損失を抑えるために、セード部材105のフロスト処理を希薄化したり、乳白色パネルに混入する拡散材の濃度を薄めて透過率を高めると、LED光源ユニット104における各LED発光素子から出射される光によって、セード部材105前面での輝度バラツキが発生し、照明器具としては視感的に好ましくないという不都合があった。   By the way, in the case where the shade member 105 is subjected to a frost treatment as in the above-described lighting fixture 101 or light is diffused using a milky white panel in which a diffusing material is mixed into the resin as the shade member 105, the shade member 105 is light-transmitted. When the water passes, light is absorbed by the frost processing section and the milky white panel, resulting in loss. On the other hand, in order to suppress the light loss in the shade member 105, if the frost processing of the shade member 105 is diluted or the concentration of the diffusing material mixed in the milky white panel is reduced to increase the transmittance, each LED in the LED light source unit 104 The light emitted from the light emitting element causes a luminance variation on the front surface of the shade member 105, which is disadvantageous in terms of luminosity as a lighting fixture.
また、上述の表示装置111は、LED光源ユニット113が出射する光を分散させるためにプリズムシート114を用いているが、プリズムシート114は、微細なカット加工が必要であり、特に微小な発光体であるLED発光素子からの光を分散するために、個々のプリズムの大きさは数百ミクロン以下、さらに好ましくは数十ミクロン以下の微細な形状が好ましいとされている。この場合、LED発光素子の発光面よりはるかに大きいプリズムシート114上に微細な加工を施す必要があり、プリズムシート114の加工コストが増大するという不都合があった。特に、このようなプリズムシートを照明装置のセード部材として用いる場合には、プリズムシートの面積が増大するためコストの増大が著しい。   Further, the display device 111 described above uses the prism sheet 114 to disperse the light emitted from the LED light source unit 113. The prism sheet 114 needs to be finely cut, and particularly a minute light emitter. In order to disperse the light from the LED light emitting element, the size of each prism is preferably a fine shape of several hundred microns or less, more preferably several tens of microns or less. In this case, it is necessary to perform fine processing on the prism sheet 114 that is much larger than the light emitting surface of the LED light emitting element, which increases the processing cost of the prism sheet 114. In particular, when such a prism sheet is used as a shade member of an illuminating device, the area of the prism sheet increases and the cost is significantly increased.
本発明は、このような問題に鑑みて為された発明であり、高価なプリズムシートを用いることなく光損失を低減しつつ発光部における輝度むらを低減することができる照明光源、照明装置、及び表示装置を提供することを目的とする。   The present invention has been made in view of such problems, and an illumination light source, an illumination device, and an illumination light source that can reduce luminance unevenness in a light emitting unit while reducing light loss without using an expensive prism sheet, and An object is to provide a display device.
上述の目的を達成するために、本発明の第1の手段に係る照明光源は、完全拡散配光を有して第1波長の光を発する複数の発光素子が、それぞれ同一平面上で隣接する他の前記発光素子と互いに所定の間隔だけ離して配設された励起光源ユニットと、前記複数の発光素子と対向配置され、前記複数の発光素子から放射された第1波長の光の一部をそのまま透過させると共に当該第1波長の光における残りの一部を前記第1波長の光よりも波長が長い第2波長の光に変換して透過させる波長変換面体と、前記複数の発光素子と前記波長変換面体との対向距離を、互いに隣接する前記発光素子における中心点間の距離の2分の1以上に支持するべく前記波長変換面体を前記励起光源ユニットに取り付ける第1の取付手段とを備え、前記第1波長及び第2波長の光は、微細な凹凸が施された拡散板及び微小なプリズムのうちいずれも通過することなく出射されることを特徴としている。 In order to achieve the above-described object, in the illumination light source according to the first means of the present invention, a plurality of light-emitting elements that emit light of the first wavelength having a completely diffuse light distribution are adjacent to each other on the same plane. An excitation light source unit disposed apart from the other light emitting elements by a predetermined distance, and a portion of the first wavelength light emitted from the plurality of light emitting elements. A wavelength conversion surface that transmits the light of the first wavelength as it is and converts the remaining part of the light of the first wavelength into light of a second wavelength that is longer than the light of the first wavelength; the plurality of light emitting elements; First mounting means for mounting the wavelength conversion surface to the excitation light source unit so as to support the opposing distance to the wavelength conversion surface by a half or more of the distance between the center points of the light emitting elements adjacent to each other. , The first wavelength and Light of the second wavelength is characterized Rukoto emitted without any of the fine irregularities is subjected diffuser and micro prisms pass.
また、上述の照明光源において、前記第1の取付手段は、前記波長変換面体を前記励起光源ユニットに脱着可能に構成されていることを特徴としている。   In the illumination light source described above, the first attachment means is configured to be detachable from the excitation light source unit.
また、本発明に係る照明光源は、完全拡散配光を有して第1波長の光を発する複数の発光素子が、それぞれ同一平面上で隣接する他の前記発光素子と互いに所定の間隔だけ離して配設された励起光源ユニットと、前記複数の発光素子とそれぞれ対向配置され、前記複数の発光素子から放射された第1波長の光の一部をそのまま透過させると共に当該第1波長の光における残りの一部を前記第1波長の光よりも波長が長い第2波長の光に変換して透過させる複数の波長変換面体と、前記複数の波長変換面体を透過する前記第1及び第2の波長の光を、前記各波長変換面体について集光する複数の集光部と前記各発光素子と前記各波長変換面体との対向距離を、互いに隣接する前記発光素子における中心点間の距離の2分の1以下に支持するべく前記各波長変換面体及び集光部を前記励起光源ユニットに取り付ける第2の取付手段とを備え、前記各集光部は、底部に開口部が設けられた凹面鏡を含み、前記各波長変換面体は、前記各凹面鏡の前記底部の開口部を塞ぐように設けられていることを特徴としている。 In the illumination light source according to the present invention, a plurality of light emitting elements that emit light having the first wavelength and have a completely diffuse light distribution are separated from each other adjacent light emitting elements on the same plane by a predetermined distance. The excitation light source unit and the plurality of light emitting elements are arranged opposite to each other, and part of the first wavelength light emitted from the plurality of light emitting elements is transmitted as it is and in the light of the first wavelength. A plurality of wavelength conversion planes that convert the remaining part into light of a second wavelength that is longer than the light of the first wavelength and transmit the light, and the first and second transmissions that pass through the plurality of wavelength conversion planes light having a wavelength, the respective wavelength conversion facepiece and a plurality of condensing unit for condensing, the opposing distance between the respective light emitting element and the respective wavelength conversion tetrahedron, the distance between the center points in the light-emitting elements adjacent to each other Should support less than half And a second attachment means for attaching each of said wavelength conversion facepiece and the condenser unit to the excitation light source unit, wherein each focusing unit includes a concave mirror having an opening provided in the bottom portion, the respective wavelength conversion facepiece The concave mirror is provided so as to close the opening at the bottom of each concave mirror .
また、本発明に係る照明光源は、完全拡散配光を有して第1波長の光を発する複数の発光素子が、それぞれ同一平面上で隣接する他の前記発光素子と互いに所定の間隔だけ離して配設された励起光源ユニットと、前記複数の発光素子とそれぞれ対向配置され、前記複数の発光素子から放射された第1波長の光の一部をそのまま透過させると共に当該第1波長の光における残りの一部を前記第1波長の光よりも波長が長い第2波長の光に変換して透過させる複数の波長変換面体と、前記複数の波長変換面体を透過する前記第1及び第2の波長の光を、前記各波長変換面体について集光する集光部と、前記各発光素子と前記各波長変換面体との対向距離を、互いに隣接する前記発光素子における中心点間の距離の2分の1以下に支持するべく前記各波長変換面体及び集光部を前記励起光源ユニットに取り付ける第2の取付手段とを備え、前記第1波長及び第2波長の光は、微細な凹凸が施された拡散板及び微小なプリズムのうちいずれも通過することなく出射されることを特徴としている。また、上述の照明光源において、前記第2の取付手段は、前記波長変換面体及び集光部を前記励起光源ユニットに脱着可能に構成されていることを特徴としている。 In the illumination light source according to the present invention, a plurality of light emitting elements that emit light having the first wavelength and have a completely diffuse light distribution are separated from each other adjacent light emitting elements on the same plane by a predetermined distance. The excitation light source unit and the plurality of light emitting elements are arranged opposite to each other, and part of the first wavelength light emitted from the plurality of light emitting elements is transmitted as it is and in the light of the first wavelength. A plurality of wavelength conversion planes that convert the remaining part into light of a second wavelength that is longer than the light of the first wavelength and transmit the light, and the first and second transmissions that pass through the plurality of wavelength conversion planes The condensing part which condenses the light of a wavelength about each said wavelength conversion surface body, and the opposing distance of each said light emitting element and each said wavelength conversion surface body is 2 minutes of the distance between the center points in the said mutually adjacent light emitting element. To support below 1 And a second attachment means for attaching the wavelength converter facepiece and the condenser unit to the excitation light source unit, the light of the first wavelength and the second wavelength, of the fine irregularities is subjected diffuser and micro prisms Both are characterized by being emitted without passing through. In the illumination light source described above, the second attachment means is configured such that the wavelength conversion surface body and the condensing part are detachable from the excitation light source unit.
また、上述の照明光源において、前記第1波長の光は青色波長の光であり、前記波長変換面体は白色光を出射するべく前記青色波長の光の一部を前記第2波長の光として黄色波長の光に変換する黄色蛍光体を備えることを特徴としている。   In the illumination light source described above, the first wavelength light is blue wavelength light, and the wavelength conversion plane is yellow with a part of the blue wavelength light as the second wavelength light to emit white light. It is characterized by comprising a yellow phosphor that converts light of a wavelength.
また、上述の照明光源において、前記第1波長の光は緑色波長の光であり、前記波長変換面体は白色光を出射するべく前記緑色波長の光の一部を前記第2波長の光として橙色波長の光に変換する橙色蛍光体を備えることを特徴としている。   In the illumination light source described above, the light of the first wavelength is light of green wavelength, and the wavelength conversion facet is orange with a part of the light of green wavelength as the light of the second wavelength so as to emit white light. It is characterized by comprising an orange phosphor that converts light of a wavelength.
また、上述の照明光源において、前記第1波長の光は緑色波長の光であり、前記波長変換面体は白色光を出射するべく前記緑色波長の光の一部を前記第2波長の光として赤色波長の光に変換する赤色蛍光体と緑色波長の光に変換する緑色蛍光体とを備えることを特徴としている。   In the illumination light source described above, the first wavelength light is green wavelength light, and the wavelength conversion surface body uses a part of the green wavelength light as red light to emit white light. It is characterized by comprising a red phosphor that converts light of a wavelength and a green phosphor that converts light of a green wavelength.
また、上述の照明光源において、前記第1波長の光は紫外線波長の光であり、前記波長変換面体は白色光を出射するべく前記紫外線波長の光の一部を前記第2波長の光として赤色波長の光に変換する赤色蛍光体と緑色波長の光に変換する緑色蛍光体と青色波長の光に変換する青色蛍光体とを備えることを特徴としている。   In the illumination light source described above, the light having the first wavelength is light having an ultraviolet wavelength, and the wavelength conversion plane is configured such that a part of the light having the ultraviolet wavelength is light having the second wavelength so as to emit white light. It is characterized by comprising a red phosphor that converts light of a wavelength, a green phosphor that converts light of a green wavelength, and a blue phosphor that converts light of a blue wavelength.
そして、本発明の第2の手段に係る照明装置は、光を発する照明光源と、前記照明光源を収容する筐体とを備え、前記照明光源は、上述の照明光源であり、前記照明光源が備える波長変換面体は、セードとして用いられることを特徴としている。また、上述の照明装置において、前記波長変換面体は、蛍光体を備えていることを特徴としている。 And the illuminating device which concerns on the 2nd means of this invention is equipped with the illumination light source which emits light, and the housing | casing which accommodates the said illumination light source, The said illumination light source is the above-mentioned illumination light source, The said illumination light source is The wavelength conversion face provided is used as a shade. Moreover, in the above-described illumination device, the wavelength conversion surface body includes a phosphor.
また、本発明の第3の手段に係る照明装置は、光を発する照明光源と、前記照明光源を収容する筐体とを備え、前記照明光源は、上述の照明光源であることを特徴としている。   An illumination device according to a third means of the present invention includes an illumination light source that emits light and a housing that houses the illumination light source, and the illumination light source is the illumination light source described above. .
そして、本発明の第4の手段に係る表示装置は、光を発する照明光源と、前記照明光源を収容する筐体とを備え、前記照明光源は、上述の照明光源であり、前記照明光源が備える波長変換面体は、前記第1波長の光を前記第2波長の光に変換する蛍光体が、表示しようとする文字又は図形を表すべく配置されていることを特徴としている。   And the display apparatus which concerns on the 4th means of this invention is equipped with the illumination light source which emits light, and the housing | casing which accommodates the said illumination light source, The said illumination light source is the above-mentioned illumination light source, The said illumination light source is The wavelength conversion face provided is characterized in that the phosphor for converting the light of the first wavelength into the light of the second wavelength is arranged to represent characters or figures to be displayed.
このような構成の照明光源及び照明装置は、完全拡散配光を有して第1波長の光を発する複数の発光素子が、それぞれ同一平面上で隣接する他の前記発光素子と互いに所定の間隔だけ離して配設される。そして、複数の発光素子から放射された第1波長の光の一部をそのまま透過させると共に当該第1波長の光における残りの一部を第1波長の光よりも波長が長い第2波長の光に変換して透過させる波長変換面体が、互いに隣接する発光素子における中心点間の距離の2分の1以上の対向距離を有して複数の発光素子と対向配置されるので、高価なプリズムシートを用いることなく光損失を低減しつつ発光面における輝度むらを低減することができる。   In the illumination light source and the illumination device having such a configuration, a plurality of light emitting elements that emit light having a first wavelength and have a completely diffuse light distribution are mutually spaced apart from each other adjacent light emitting elements on the same plane. Only spaced apart. Then, a part of the first wavelength light emitted from the plurality of light emitting elements is transmitted as it is, and the remaining part of the first wavelength light is the second wavelength light having a longer wavelength than the first wavelength light. Since the wavelength conversion plane that is converted into and transmits the light is arranged opposite to the plurality of light emitting elements with an opposing distance of one half or more of the distance between the center points of the adjacent light emitting elements, an expensive prism sheet The luminance unevenness on the light emitting surface can be reduced while reducing the optical loss without using.
また、このような構成の照明光源及び照明装置は、完全拡散配光を有して第1波長の光を発する複数の発光素子が、それぞれ同一平面上で隣接する他の前記発光素子と互いに所定の間隔だけ離して配設される。そして、複数の発光素子から放射された第1波長の光の一部をそのまま透過させると共に当該第1波長の光における残りの一部を第1波長の光よりも波長が長い第2波長の光に変換して透過させる複数の波長変換面体が、互いに隣接する発光素子における中心点間の距離の2分の1以下の対向距離を有して複数の発光素子と対向配置される。さらに、複数の波長変換面体を透過する第1及び第2の波長の光が、各波長変換面体について集光されるので、高価なプリズムシートを用いることなく光損失を低減しつつ発光部における輝度むらを低減することができる。   Further, in the illumination light source and the illumination device having such a configuration, a plurality of light emitting elements that emit light of the first wavelength having a completely diffuse light distribution are mutually predetermined with other light emitting elements adjacent to each other on the same plane. Are spaced apart from each other. Then, a part of the first wavelength light emitted from the plurality of light emitting elements is transmitted as it is, and the remaining part of the first wavelength light is the second wavelength light having a longer wavelength than the first wavelength light. The plurality of wavelength conversion planes that are converted to be transmitted and are opposed to the plurality of light emitting elements with an opposing distance that is half or less of the distance between the center points of the adjacent light emitting elements. Furthermore, since the light of the 1st and 2nd wavelength which permeate | transmits a some wavelength conversion surface body is condensed about each wavelength conversion surface body, the brightness | luminance in a light emission part is reduced, reducing an optical loss, without using an expensive prism sheet. Unevenness can be reduced.
そして、このような構成の表示装置は、完全拡散配光を有して第1波長の光を発する複数の発光素子が、それぞれ同一平面上で隣接する他の前記発光素子と互いに所定の間隔だけ離して配設される。そして、複数の発光素子から放射された第1波長の光の一部をそのまま透過させると共に当該第1波長の光における残りの一部を第1波長の光よりも波長が長い第2波長の光に変換して透過させる波長変換面体が、互いに隣接する発光素子における中心点間の距離の2分の1以上の対向距離を有して複数の発光素子と対向配置される。さらに、波長変換面体は、第1波長の光を第2波長の光に変換する蛍光体が、表示しようとする文字又は図形を表すべく配置されているので、高価なプリズムシートを用いることなく光損失を低減しつつ輝度むらが低減された光によって、文字又は図形を表示することができる。   In the display device having such a configuration, a plurality of light-emitting elements that emit light having the first wavelength and have a completely diffuse light distribution are separated from each other adjacent light-emitting elements on the same plane by a predetermined distance. Spaced apart. Then, a part of the first wavelength light emitted from the plurality of light emitting elements is transmitted as it is, and the remaining part of the first wavelength light is the second wavelength light having a longer wavelength than the first wavelength light. The wavelength conversion facets that are converted to be transmitted through are arranged opposite to the plurality of light emitting elements with an opposing distance of one half or more of the distance between the center points of the adjacent light emitting elements. Further, the wavelength conversion facet is arranged without the use of an expensive prism sheet because the phosphor that converts the first wavelength light into the second wavelength light is arranged to represent characters or figures to be displayed. Characters or graphics can be displayed by light with reduced luminance unevenness while reducing loss.
以下、本発明に係る実施形態を図面に基づいて説明する。なお、各図において同一の符号を付した構成は、同一の構成であることを示し、その説明を省略する。   Embodiments according to the present invention will be described below with reference to the drawings. In addition, the structure which attached | subjected the same code | symbol in each figure shows that it is the same structure, The description is abbreviate | omitted.
(第1実施形態)
図1は、本発明の第1の実施形態に係る照明光源の外観の一例を示す斜視図である。また、図2は、図1に示す照明光源の断面図である。図2に示す照明光源1は、完全拡散配光を有して青色波長(第1波長)の光を発する複数の発光素子の一例であるLED2が、それぞれ同一平面上で隣接する他のLED2と互いに所定の間隔だけ離して配設された励起光源ユニット3と、複数のLED2と対向配置され、複数のLED2から放射された青色波長の光の一部をそのまま透過させると共に青色波長の光における残りの一部を青色波長の光よりも波長が長い黄色波長(第2波長)の光に変換して透過させる波長変換面体4とを備えている。
(First embodiment)
FIG. 1 is a perspective view showing an example of the appearance of an illumination light source according to the first embodiment of the present invention. FIG. 2 is a cross-sectional view of the illumination light source shown in FIG. The illumination light source 1 shown in FIG. 2 has an LED 2 that is an example of a plurality of light emitting elements that emit light having a blue wavelength (first wavelength) with a completely diffuse light distribution, and other LEDs 2 that are adjacent to each other on the same plane. The excitation light source unit 3 and the plurality of LEDs 2 which are arranged apart from each other by a predetermined distance are disposed opposite to each other, and part of the blue wavelength light emitted from the plurality of LEDs 2 is transmitted as it is and the remaining light in the blue wavelength light. And a wavelength conversion plane 4 that converts a part of the light into light having a yellow wavelength (second wavelength) that is longer than the light having a blue wavelength and transmitting the light.
LED2は、例えばInGaN系LEDチップを用いて青色波長の光を発光するようになっている。LED2は、例えば、LEDチップと、LEDチップから出射された光を完全拡散配光(ランバーシアン配光)させるレンズとを組み合わせて構成されたものを用いることができ、このような完全拡散配光を有するLEDとして、例えば図3(a),(b),(c)に示す構成のLEDが知られている。   The LED 2 emits light having a blue wavelength using, for example, an InGaN LED chip. For example, the LED 2 can be configured by combining an LED chip and a lens that perfectly diffuses light emitted from the LED chip (Lambertian light distribution). For example, LEDs having the configuration shown in FIGS. 3A, 3B, and 3C are known.
励起光源ユニット3は、基板8と、複数のLED2とを備えて構成されており、基板8の一方面上に互いに隣接するLED2における中心点間の距離が、距離D1にされている。   The excitation light source unit 3 includes a substrate 8 and a plurality of LEDs 2, and the distance between the center points of the LEDs 2 adjacent to each other on one surface of the substrate 8 is a distance D1.
波長変換面体4は、例えばアクリル等の透明樹脂材料中に、LED2から出射された青色波長の光を黄色波長の光に変換する蛍光体を混入し、射出成形することで形成されている。蛍光体6としては、例えばYAG:Ceなどの黄色蛍光体が用いられる。そして、波長変換面体4は、一面が開口された略箱形形状にされており、開口部が基板8に取り付けられている。そして、波長変換面体4の側壁部5によって、複数のLED2と波長変換面体4との対向距離D2が、距離(D1)/2以上の距離を有して支持されており、すなわち、以下の式(1)を満たすように、波長変換面体4が励起光源ユニット3に取り付けられている。この場合、側壁部5が第1の取付手段の一例に相当している。   The wavelength conversion surface body 4 is formed by mixing a phosphor that converts blue wavelength light emitted from the LED 2 into yellow wavelength light in a transparent resin material such as acrylic, and injection molding. For example, a yellow phosphor such as YAG: Ce is used as the phosphor 6. The wavelength conversion face 4 has a substantially box shape with one surface opened, and the opening is attached to the substrate 8. The opposing distance D2 between the plurality of LEDs 2 and the wavelength conversion surface body 4 is supported by the side wall portion 5 of the wavelength conversion surface body 4 so as to have a distance of (D1) / 2 or more. The wavelength conversion face 4 is attached to the excitation light source unit 3 so as to satisfy (1). In this case, the side wall 5 corresponds to an example of the first attachment means.
D2≧(D1)/2 ・・・(1)
ここで、LED2は、図2に破線で示すように、配光特性7が完全拡散配光にされているので、対向距離D2は、LED2の1つが出射する光の配光の垂直方向における配光の最大広がり部と、当該LED2と隣接する他のLED2が出射する光の配光の最大広がり部とが接する位置以上にLED2から離れた距離となる。
D2 ≧ (D1) / 2 (1)
Here, as indicated by the broken line in FIG. 2, the light distribution characteristic 7 of the LED 2 is a perfect diffusion light distribution. Therefore, the facing distance D <b> 2 is a vertical distribution of the light distribution of one of the LEDs 2. The distance is farther from the LED 2 than the position where the maximum spreading portion of the light and the maximum spreading portion of the light distribution of the light emitted from the other LED 2 adjacent to the LED 2 are in contact.
次に、上述のように構成された照明光源1の動作を説明する。まず、励起光源ユニット3のLED2内のLEDチップから出射した青色波長の光は、LED2内のレンズによって完全拡散配光にされてLED2から出射する。LED2から出射した青色波長の光は、波長変換面体4に入射し、波長変換面体4において、青色波長の光の一部はそのまま波長変換面体4を透過し、残りの青色波長の光は、波長変換面体4に混入されている蛍光体6によって黄色波長の光に変換され、波長変換面体4から出射される。波長変換面体4の出射面においては、波長変換面体4をそのまま透過した青色波長の光と、蛍光体6によって青色波長の光が変換された黄色波長の光が混合され、白色光として波長変換面体4から出射される。   Next, the operation of the illumination light source 1 configured as described above will be described. First, the blue wavelength light emitted from the LED chip in the LED 2 of the excitation light source unit 3 is emitted from the LED 2 after being completely diffused by the lens in the LED 2. The blue wavelength light emitted from the LED 2 is incident on the wavelength conversion surface body 4, and in the wavelength conversion surface body 4, a part of the blue wavelength light is transmitted through the wavelength conversion surface body 4 as it is, and the remaining blue wavelength light is the wavelength. The phosphor 6 mixed in the conversion surface 4 is converted into light having a yellow wavelength and emitted from the wavelength conversion surface 4. On the emission surface of the wavelength conversion surface 4, the blue wavelength light that has passed through the wavelength conversion surface 4 is mixed with the yellow wavelength light that has been converted from the blue wavelength by the phosphor 6, and the wavelength conversion surface is converted into white light. 4 is emitted.
ここで、図4を参照して波長変換面体4における光の波長の変換動作について説明する。波長変換面体4には蛍光体6が混入されており、励起光源ユニット3のLED2から出射された完全拡散配光を成す青色波長の光は、蛍光体6の任意の部位に到達し、蛍光体6によって黄色波長の光に変換される。この際、図4に示すとおり、黄色波長の光は青色波長の光の入射方向に対して、任意の方向に分散されて波長変換面体4より出射する。波長変換面体4は、励起光源ユニット3のLED2の完全拡散配光特性7の最大広がり部が隣接するような距離D2をもって取り付けられており、波長変換面体4の出射面において、配光特性7の隣接部における出射光輝度の低下は、黄色波長の光が分散されて出射されることによって補われる。これにより、波長変換面体4の出射面において、輝度むら(輝度バラツキ)が低減された均一性の高い白色光を得ることができる。   Here, the operation of converting the wavelength of light in the wavelength conversion surface body 4 will be described with reference to FIG. A phosphor 6 is mixed in the wavelength conversion surface body 4, and light of a blue wavelength forming a complete diffused light distribution emitted from the LED 2 of the excitation light source unit 3 reaches an arbitrary part of the phosphor 6, and the phosphor 6 is converted into light of yellow wavelength. At this time, as shown in FIG. 4, the yellow wavelength light is dispersed in an arbitrary direction with respect to the incident direction of the blue wavelength light and is emitted from the wavelength conversion plane 4. The wavelength conversion plane body 4 is attached with a distance D2 such that the maximum spread portion of the perfect diffusion light distribution characteristic 7 of the LED 2 of the excitation light source unit 3 is adjacent to the wavelength conversion plane body 4. The decrease in the luminance of the emitted light in the adjacent portion is compensated for by dispersing and emitting the yellow wavelength light. Thereby, white light with high uniformity in which luminance unevenness (luminance variation) is reduced can be obtained on the emission surface of the wavelength conversion surface body 4.
また、波長変換面体4は青色波長の光を黄色波長の光に変換するとともに、黄色波長の光を分散させる機能を有しているため、光を分散させるための拡散板やプリズムシートなどを用いることなく輝度むらを低減することができる。   In addition, the wavelength conversion plane 4 has a function of converting blue wavelength light into yellow wavelength light and dispersing yellow wavelength light, and therefore, a diffusion plate or a prism sheet for dispersing the light is used. The luminance unevenness can be reduced without any problem.
さらに、励起光源ユニット3から出射された光が外部に出射されるまでに通過するのは波長変換面体4のみであり、拡散板、プリズムなどによる光損失がないため、光損失を低減することができる。   Further, only the wavelength conversion plane 4 passes through the light emitted from the excitation light source unit 3 until it is emitted to the outside, and there is no light loss due to a diffusion plate, a prism, etc., so that the light loss can be reduced. it can.
なお、蛍光体6を波長変換面体4中に混入する例を示したが、波長変換面体4は、例えば図5(a)に示すように、例えばアクリルやガラス等の透明板41の表面に、例えばシリコンなどの樹脂基材に蛍光体6を混入してシート状にしたシート部材42を貼り付ける構成としてもよい。また、波長変換面体4は、例えば図5(b)に示すように、透明板41の表面に、蛍光体6を塗布したものであってもよい。   In addition, although the example which mixes the fluorescent substance 6 in the wavelength conversion surface body 4 was shown, as shown in FIG. 5A, for example, the wavelength conversion surface body 4 is formed on the surface of a transparent plate 41 such as acrylic or glass. For example, it is good also as a structure which affixes the sheet | seat member 42 which mixed the fluorescent substance 6 on the resin base materials, such as a silicon | silicone, and was made into the sheet form. Moreover, the wavelength conversion surface body 4 may apply | coat the fluorescent substance 6 to the surface of the transparent plate 41, as shown, for example in FIG.5 (b).
また、白色光を得るためのLED2と蛍光体6との構成にあたっては、紫外波長の光を出射するLED発光素子(例えば、InGaN系LED)と、紫外波長の光を受けて、赤色に変換する蛍光体(例えば、YAG:EU)、緑色に変換する蛍光体(例えば、SrGa2S4:EU)、及び青色に変換する蛍光体(例えば、3Sr(Po・CaCl:Eu2+)を波長変換面体4に混入させてもよく、或いは、緑色波長の光を出射するLED発光素子(例えばAlInGaP系LED)と、緑色波長の光を受けて波長600nm前後の橙色波長の光に変換する蛍光体(例えば、YAG:Ce)を用いてよく、また、緑色波長の光を出射するLED発光素子と、赤色蛍光体(例えば、Y:Eu)、緑色蛍光体(例えば、ZnS:Cu)を混合し、混入させた波長変換面体4とを用いてもよい。 In addition, in the configuration of the LED 2 and the phosphor 6 for obtaining white light, an LED light emitting element (for example, an InGaN-based LED) that emits ultraviolet light and ultraviolet light is received and converted to red. Wavelengths of phosphors (for example, YAG: EU), phosphors for converting to green (for example, SrGa2S4: EU), and phosphors for converting to blue (for example, 3Sr 3 (Po 4 ) 2 .CaCl 2 : Eu 2+ ) An LED light emitting element (for example, an AlInGaP-based LED) that emits green wavelength light and a phosphor that receives green wavelength light and converts it into orange wavelength light having a wavelength of about 600 nm may be mixed in the conversion surface 4 (For example, YAG: Ce) may be used, and an LED light emitting element that emits light having a green wavelength, a red phosphor (for example, Y 2 O 3 : Eu), and a green phosphor (for example, , ZnS: Cu) and a mixed wavelength conversion face 4 may be used.
(第2実施形態)
図6は、本発明の第2の実施形態に係る照明光源の外観の一例を示す斜視図である。また、図7は、図6に示す照明光源の断面図である。図7に示す照明光源10は、完全拡散配光を有して青色波長の光を発する複数のLED2が、それぞれ同一平面上で隣接する他のLED2と互いに所定の間隔だけ離して配設された励起光源ユニット3と、複数のLED2とそれぞれ対向配置され、複数のLED2から放射された青色波長の光の一部をそのまま透過させると共に青色波長の光における残りの一部を青色波長の光よりも波長が長い黄色波長の光に変換して透過させる複数の波長変換面体4と、複数の波長変換面体4を透過する青色及び黄色波長の光を、各波長変換面体について集光する複数の集光部11とを備えている。
(Second Embodiment)
FIG. 6 is a perspective view showing an example of the appearance of an illumination light source according to the second embodiment of the present invention. FIG. 7 is a cross-sectional view of the illumination light source shown in FIG. In the illumination light source 10 shown in FIG. 7, a plurality of LEDs 2 having a completely diffusive light distribution and emitting blue wavelength light are arranged at a predetermined distance from other adjacent LEDs 2 on the same plane. The excitation light source unit 3 and each of the plurality of LEDs 2 are arranged to face each other, and a part of the blue wavelength light emitted from the plurality of LEDs 2 is transmitted as it is, and the remaining part of the blue wavelength light is more than the blue wavelength light. A plurality of wavelength conversion planes 4 that convert yellow light having a long wavelength and transmit the light, and a plurality of condensing beams that collect blue and yellow wavelength light transmitted through the plurality of wavelength conversion planes 4 for each wavelength conversion plane. Part 11.
励起光源ユニット3の基板8におけるLED2が配設されている側の面には、例えば円筒状の差込孔32が形成されており、差込孔32には例えば円柱形の支柱33が挿入されている。   For example, a cylindrical insertion hole 32 is formed on the surface of the substrate 8 of the excitation light source unit 3 on which the LED 2 is disposed. For example, a columnar column 33 is inserted into the insertion hole 32. ing.
集光部11は、底部に開口部が設けられた凹面鏡12と、凹レンズ13とを備えている。そして、凹面鏡12の底部の開口部を塞ぐように波長変換面体4が取り付けられており、波長変換面体4における凹面鏡12の内側の面に、凹レンズ13が固着されている。さらに、複数の集光部11が凹面鏡12の端部で互いに結合され、一体にされている。複数の集光部11は、例えば互いに結合された状態で一体成形されてもよい。   The condensing unit 11 includes a concave mirror 12 having an opening at the bottom and a concave lens 13. And the wavelength conversion surface body 4 is attached so that the opening part of the bottom part of the concave mirror 12 may be plugged up, and the concave lens 13 is fixed to the surface inside the concave mirror 12 in the wavelength conversion surface body 4. Further, a plurality of light collecting portions 11 are coupled to each other at the end of the concave mirror 12 and integrated. The plurality of light collecting portions 11 may be integrally formed, for example, in a state of being coupled to each other.
そして、一体にされた複数の集光部11が支柱33によって脱着可能に支持され、各LED2と各波長変換面体4との対向距離D2が、距離(D1)/2以下の距離となるようにされている。この場合、支柱33が第2の取付手段の一例に相当している。また、集光部11は、以下の式(2)を満たすように、励起光源ユニット3に取り付けられている。   The plurality of integrated light collecting portions 11 are detachably supported by the support columns 33 so that the facing distance D2 between each LED 2 and each wavelength conversion surface body 4 is a distance of (D1) / 2 or less. Has been. In this case, the support column 33 corresponds to an example of a second attachment means. Moreover, the condensing part 11 is attached to the excitation light source unit 3 so that the following formula | equation (2) may be satisfy | filled.
D2≦(D1)/2 ・・・(2)
ここで、LED2は、図2に破線で示すように、配光特性7が完全拡散配光にされているので、対向距離D2は、LED2の1つが出射する光の配光の垂直方向における配光の最大広がり部と、当該LED2と隣接する他のLED2が出射する光の配光の最大広がり部とが接する位置の距離以下となる。
D2 ≦ (D1) / 2 (2)
Here, as indicated by the broken line in FIG. 2, the light distribution characteristic 7 of the LED 2 is a perfect diffusion light distribution. Therefore, the facing distance D <b> 2 is a vertical distribution of the light distribution of one of the LEDs 2. The distance is less than or equal to the distance between the maximum spread portion of light and the maximum spread portion of the light distribution of the light emitted from another LED 2 adjacent to the LED 2.
次に、上述のように構成された照明光源10の動作を説明する。図8は、照明光源10の動作を説明するための説明図である。まず、励起光源ユニット3のLED2内のLEDチップから出射した青色波長の光は、LED2内のレンズによって完全拡散配光にされてLED2から出射する。LED2から出射した青色波長の光(実線)は、凹面鏡12の底部に設けられた波長変換面体4に入射し、波長変換面体4において、青色波長の光の一部はそのまま波長変換面体4を透過し、残りの青色波長の光は、波長変換面体4に混入されている蛍光体6によって黄色波長の光(破線)に変換され、波長変換面体4から出射される。波長変換面体4の出射面においては、波長変換面体4をそのまま透過した青色波長の光と、蛍光体6によって青色波長の光が変換された黄色波長の光が混合され、白色光として波長変換面体4から凹レンズ13へ出射される。   Next, the operation of the illumination light source 10 configured as described above will be described. FIG. 8 is an explanatory diagram for explaining the operation of the illumination light source 10. First, the blue wavelength light emitted from the LED chip in the LED 2 of the excitation light source unit 3 is emitted from the LED 2 after being completely diffused by the lens in the LED 2. The blue wavelength light (solid line) emitted from the LED 2 is incident on the wavelength conversion surface body 4 provided at the bottom of the concave mirror 12, and part of the blue wavelength light is transmitted through the wavelength conversion surface body 4 as it is. The remaining blue wavelength light is converted into yellow wavelength light (broken line) by the phosphor 6 mixed in the wavelength conversion surface body 4 and emitted from the wavelength conversion surface body 4. On the emission surface of the wavelength conversion surface 4, the blue wavelength light that has passed through the wavelength conversion surface 4 is mixed with the yellow wavelength light that has been converted from the blue wavelength by the phosphor 6, and the wavelength conversion surface is converted into white light. 4 is emitted to the concave lens 13.
波長変換面体4から出射された白色光は、凹レンズ13により屈折され、凹面鏡12によって集光されて外部へ出射される。なお、凹レンズ13及び凹面鏡12の光学特性は、用途に合わせて任意の集光設計が可能である。   The white light emitted from the wavelength conversion surface body 4 is refracted by the concave lens 13, condensed by the concave mirror 12, and emitted to the outside. The optical characteristics of the concave lens 13 and the concave mirror 12 can be arbitrarily designed according to the application.
ここで、LED2は完全拡散配光特性を有しており、LED2が出射する光を効率よく凹レンズ13に入射させるためには、凹レンズ13に固着された波長変換面体4と励起光源ユニット3上のLED2との距離D2は、LED2の1つが出射する光の配光の垂直方向における配光の最大広がり部と、当該LED2と隣接する他のLED2が出射する光の配光の最大広がり部とが接する位置の距離以下、すなわち、励起光源ユニット3における互いに隣接するLED2における中心点間の距離D1に対して、D2≦(D1)/2となるように配置することが望ましい。   Here, the LED 2 has a completely diffusing light distribution characteristic, and in order to make the light emitted from the LED 2 enter the concave lens 13 efficiently, the wavelength conversion surface 4 fixed to the concave lens 13 and the excitation light source unit 3 are provided. The distance D2 from the LED 2 is the maximum spread portion of the light distribution in the vertical direction of the light distribution of one of the LEDs 2 and the maximum spread portion of the light distribution of another LED 2 adjacent to the LED 2. It is desirable to arrange such that D2 ≦ (D1) / 2 with respect to the distance of the contact position or less, that is, the distance D1 between the center points of the LEDs 2 adjacent to each other in the excitation light source unit 3.
集光部11に取り付けられた波長変換面体4と励起光源ユニット3上のLED2との距離D2を、励起光源ユニット3における互いに隣接するLED2における中心点間の距離D1に対して、D2≦(D1)/2とすることにより、LED2が出射する青色波長の光を効率よく波長変換面体4に入射させ、波長変換面体4により白色光に変換し、集光部11で集光することができる。   The distance D2 between the wavelength conversion surface 4 attached to the condensing unit 11 and the LED 2 on the excitation light source unit 3 is set to D2 ≦ (D1) with respect to the distance D1 between the center points of the LEDs 2 adjacent to each other in the excitation light source unit 3. ) / 2, the blue wavelength light emitted from the LED 2 can be efficiently incident on the wavelength conversion surface body 4, converted into white light by the wavelength conversion surface body 4, and condensed by the condensing unit 11.
なお図7においては、複数の集光部11が一体に結合された状態で支柱33により励起光源ユニット3に固定される例を示したが、各LED2に対して個別に集光部11を取り付ける機構を設けてもよい。   In FIG. 7, an example in which the plurality of light collecting portions 11 are integrally coupled to the excitation light source unit 3 by the support column 33 is illustrated. However, the light collecting portions 11 are individually attached to the respective LEDs 2. A mechanism may be provided.
このように構成された照明光源10によれば、集光部11に取り付けられた波長変換面体4と励起光源ユニット3上のLED発光素子との距離D2を、励起光源ユニット3における互いに隣接するLED2における中心点間の距離D1に対して、D2≦(D1)/2となるように配置することにより、LED2が出射する青色波長の光を効率よく波長変換面体4に入射させ、波長変換面体4により白色光に変換し、集光部11で集光することができる。集光部11は、種々の集光特性を有するものを揃えておき、用途に合わせて交換するようにしてもよい。また、図2に記載の照明光源1と図7に記載の照明光源10とは、励起光源ユニット3の構成が共通するので、図2に記載の照明光源1における波長変換面体4と、波長変換面体4が取り付けられた集光部11とを交換することにより、拡散光を均一化することができる照明光源1の構成と、集光特性を有する照明光源10の構成とを容易に切り替えることができる。   According to the illumination light source 10 configured as described above, the distance D2 between the wavelength conversion surface body 4 attached to the light collecting unit 11 and the LED light emitting element on the excitation light source unit 3 is set to be adjacent to each other in the LED 2 adjacent to the excitation light source unit 3. By arranging so that D2 ≦ (D1) / 2 with respect to the distance D1 between the center points, the light having the blue wavelength emitted from the LED 2 is efficiently incident on the wavelength conversion surface 4 and the wavelength conversion surface 4 Therefore, the light can be converted into white light and can be collected by the light collecting unit 11. The condensing unit 11 may have various condensing characteristics and may be exchanged according to the application. Further, the illumination light source 1 shown in FIG. 2 and the illumination light source 10 shown in FIG. 7 have the same configuration of the excitation light source unit 3, so that the wavelength conversion plane 4 and the wavelength conversion in the illumination light source 1 shown in FIG. By exchanging the condensing unit 11 to which the face body 4 is attached, it is possible to easily switch between the configuration of the illumination light source 1 capable of uniforming diffused light and the configuration of the illumination light source 10 having condensing characteristics. it can.
(第3実施形態)
図9は、本発明の第3の実施形態に係る照明装置の外観の一例を示す斜視図である。また、図10は、図9に示す照明装置20の分解斜視図である。図10に示す照明装置20は、略円筒状の筐体21に、図2に示す励起光源ユニット3が収容されており、波長変換面体4が励起光源ユニット3全体を覆うようにドーム状に形成されて照明装置20のセードとして用いられるようになっている。
(Third embodiment)
FIG. 9 is a perspective view showing an example of an appearance of a lighting apparatus according to the third embodiment of the present invention. FIG. 10 is an exploded perspective view of the lighting device 20 shown in FIG. The illuminating device 20 shown in FIG. 10 contains the excitation light source unit 3 shown in FIG. 2 in a substantially cylindrical casing 21, and the wavelength conversion face 4 is formed in a dome shape so as to cover the entire excitation light source unit 3. And used as a shade of the lighting device 20.
ドーム状に形成された波長変換面体4の開口端部には、例えば係合用の爪を備えた略板状の取付部43(第1の取付手段)が凸設され、励起光源ユニット3の基板8におけるLED2が配設されている側の面には、例えばスリット状の差込孔34が形成されており、差込孔34に取付部43を挿入することにより、励起光源ユニット3に波長変換面体4を脱着可能に構成されている。そして、複数のLED2と波長変換面体4における任意の点との距離D2が上記式(1)を満たすべく、波長変換面体4がドーム状にされている。   A substantially plate-like attachment portion 43 (first attachment means) provided with, for example, an engaging claw is protruded from the opening end of the wavelength conversion face 4 formed in a dome shape, and the substrate of the excitation light source unit 3 is provided. For example, a slit-like insertion hole 34 is formed on the surface of the LED 8 on which the LED 2 is disposed. By inserting a mounting portion 43 into the insertion hole 34, the wavelength conversion into the excitation light source unit 3 is performed. The face body 4 is configured to be removable. And the wavelength conversion surface body 4 is made into the dome shape so that the distance D2 of several LED2 and the arbitrary points in the wavelength conversion surface body 4 may satisfy | fill said Formula (1).
上述のように構成された照明装置20は、図2に示す照明光源1と同様の動作により、光を分散させるための拡散板やプリズムシートなどを用いることなく輝度むらを低減することができ、拡散板、プリズムなどによる光損失がないため、光損失を低減することができる。   The illumination device 20 configured as described above can reduce luminance unevenness without using a diffusion plate or a prism sheet for dispersing light, by the same operation as the illumination light source 1 shown in FIG. Since there is no light loss due to a diffusing plate, a prism or the like, the light loss can be reduced.
なお、波長変換面体4は、青色波長の光を黄色波長の光に変換する黄色蛍光体6を備える例を示したが、変換する色が異なる蛍光体を用いて照明装置20の発光色を変えてもよい。例えば図11に示すように、黄色蛍光体6に赤色成分を加味した別の蛍光体を混入した波長変換面体4aをセードに用いて、照明装置20に電球色の発光をさせるようにしてもよい。この場合、照明装置20において、セードに用いる波長変換面体4と波長変換面体4aとを取り替えることにより、照明装置20の色調を変えることができるので、ユーザの要望に柔軟に対応することができる。   In addition, although the wavelength conversion surface body 4 showed the example provided with the yellow fluorescent substance 6 which converts the light of a blue wavelength into the light of a yellow wavelength, the luminescent color of the illuminating device 20 was changed using the fluorescent substance from which the color to convert differs. May be. For example, as shown in FIG. 11, the lighting device 20 may emit a light bulb color by using a wavelength conversion surface 4 a in which another phosphor in which a red component is added to the yellow phosphor 6 is mixed as a shade. . In this case, in the illuminating device 20, the color tone of the illuminating device 20 can be changed by replacing the wavelength conversion surface 4 and the wavelength conversion surface 4 a used for shade, so that it is possible to flexibly respond to the user's request.
また、複数の集光部11が一体に結合された集光モジュール14に取付部43(第2の取付手段)を設けることによって、差込孔34に取付部43を挿入することにより励起光源ユニット3に集光モジュール14を脱着可能に構成してもよい。これにより、照明装置20における波長変換面体4と集光モジュール14との取り替えが容易となり、照明装置20の集光特性を変えることができるので、ユーザの要望に柔軟に対応することができる。   Further, by providing the light collecting module 14 in which the plurality of light collecting portions 11 are integrally coupled with the attachment portion 43 (second attachment means), the excitation light source unit is inserted by inserting the attachment portion 43 into the insertion hole 34. 3, the condensing module 14 may be configured to be removable. This facilitates replacement of the wavelength conversion face 4 and the condensing module 14 in the illuminating device 20 and can change the condensing characteristics of the illuminating device 20, so that it is possible to flexibly respond to user requests.
また、照明装置20は、波長変換面体を用いて発光色を調整するため、励起光源ユニット3は、照明装置20の発光色に依らずLED2の色は一種類でよく、比較的高価なLED発光素子の在庫種類を減少させることができ、照明装置20の生産効率を向上させることができる。   Moreover, since the illuminating device 20 adjusts the luminescent color using the wavelength conversion facet, the excitation light source unit 3 may have only one kind of color of the LED 2 regardless of the luminescent color of the illuminating device 20, and a relatively expensive LED light emission. The inventory type of elements can be reduced, and the production efficiency of the lighting device 20 can be improved.
(第4実施形態)
図12は、本発明の第4の実施形態に係る表示装置の一例を示す分解斜視図である。図12に示す表示装置30は、箱形の筐体31に図2に示す励起光源ユニット3が収容されており、図2と同様側壁部5を備えた波長変換面体4bが励起光源ユニット3全体を覆うように取り付けられるようになっている。
(Fourth embodiment)
FIG. 12 is an exploded perspective view showing an example of a display device according to the fourth embodiment of the present invention. A display device 30 shown in FIG. 12 includes a box-shaped housing 31 that accommodates the excitation light source unit 3 shown in FIG. 2, and the wavelength conversion facet 4b having the side wall portion 5 as in FIG. Can be attached to cover.
図12に示す波長変換面体4bは、表示しようとする文字又は図形を表すべく、文字表示部分及び図形表示部分には透過部材に蛍光体6を混入し、文字表示部分及び図形表示部分を除く他の部分は透過部材に拡散材料を混入して、蛍光体6を混入した透過部材と拡散材料を混入した透過部材とを組み合わせて構成されている。そして、複数のLED2と波長変換面体4bとの対向距離D2が上記式(1)を満たすべく、側壁部5が形成されている。   The wavelength conversion surface 4b shown in FIG. 12 includes a phosphor 6 mixed in a transparent member in a character display portion and a graphic display portion to represent a character or a graphic to be displayed, and excludes the character display portion and the graphic display portion. This part is configured by mixing a diffusing material into the transmissive member and combining the transmissive member mixed with the phosphor 6 and the transmissive member mixed with the diffusing material. And the side wall part 5 is formed so that opposing distance D2 of several LED2 and the wavelength conversion surface body 4b may satisfy | fill said Formula (1).
表示装置30においては、LED2として例えば緑色波長(第1波長)の光を出射するものが用いられ、蛍光体6として緑色波長の光を橙色(第2波長)の光に変換する蛍光体が用いられている。   In the display device 30, for example, an LED 2 that emits green wavelength (first wavelength) light is used as the LED 2, and a phosphor that converts green wavelength light into orange (second wavelength) light is used as the phosphor 6. It has been.
次に、上述のように構成された表示装置30の動作を説明する。まず、励起光源ユニット3のLED2内のLEDチップから出射された緑色波長の光は、LED2内のレンズによって完全拡散配光にされてLED2から出射する。LED2から出射した緑色波長の光は、波長変換面体4bに入射し、波長変換面体4bにおいて、拡散材料が混入された部位に入射した緑色波長の光は拡散材料により分散されて、緑色の光を波長変換面体4b前面より出射する。   Next, the operation of the display device 30 configured as described above will be described. First, the green wavelength light emitted from the LED chip in the LED 2 of the excitation light source unit 3 is made to be completely diffused by the lens in the LED 2 and emitted from the LED 2. The green wavelength light emitted from the LED 2 is incident on the wavelength conversion surface 4b, and the green wavelength light incident on the portion where the diffusion material is mixed in the wavelength conversion surface 4b is dispersed by the diffusion material, and the green light is The light is emitted from the front surface of the wavelength conversion face 4b.
また、波長変換面体4bにおいて、蛍光体6が混入された文字表示部分および図形表示部分に入射した緑色波長の光は、一部はそのまま波長変換面体4bを通過し、残りの光は波長変換面体4bに混入されている蛍光体6によって、橙色波長の光に変換されると共に任意の方向に分散されて波長変換面体4bから出射する。波長変換面体4bの出射面においては、波長変換面体4bを通過した緑色波長の光と、緑色波長の光を受け蛍光体6により変換され、分散されて出射した橙色波長の光とが混合され、波長変換面体4bの文字表示部分及び図形表示部分は白色光を発光する。   In the wavelength conversion plane 4b, part of the green wavelength light incident on the character display portion and the graphic display portion mixed with the phosphor 6 passes through the wavelength conversion plane 4b as it is, and the rest of the light is the wavelength conversion plane. The phosphor 6 mixed in 4b is converted into light having an orange wavelength and is dispersed in an arbitrary direction to be emitted from the wavelength conversion plane 4b. On the exit surface of the wavelength conversion surface body 4b, the green wavelength light that has passed through the wavelength conversion surface body 4b and the green wavelength light that has been converted by the phosphor 6 and dispersed and emitted are mixed, The character display portion and the graphic display portion of the wavelength conversion face 4b emit white light.
これにより、表示装置30は、緑色の光と白色の光とにより、文字や図形の発光表示を行う表示装置として用いることができ、例えば避難誘導灯のような照明器具に好適である。   Thereby, the display apparatus 30 can be used as a display apparatus which performs the light emission display of a character and a figure with green light and white light, for example, is suitable for lighting fixtures, such as an evacuation guide light.
本発明の第1の実施形態に係る照明光源の外観の一例を示す斜視図である。It is a perspective view which shows an example of the external appearance of the illumination light source which concerns on the 1st Embodiment of this invention. 図1に示す照明光源の断面図である。It is sectional drawing of the illumination light source shown in FIG. 図2に示す照明光源に用いることができるLEDの一例を示す断面図である。It is sectional drawing which shows an example of LED which can be used for the illumination light source shown in FIG. 図2に示す波長変換面体の動作を説明するための説明図である。It is explanatory drawing for demonstrating operation | movement of the wavelength conversion face body shown in FIG. 図2に示す波長変換面体の他の一例を示す図である。It is a figure which shows another example of the wavelength conversion surface body shown in FIG. 本発明の第2の実施形態に係る照明光源の外観の一例を示す斜視図である。It is a perspective view which shows an example of the external appearance of the illumination light source which concerns on the 2nd Embodiment of this invention. 図6に示す照明光源の断面図である。It is sectional drawing of the illumination light source shown in FIG. 照明光源の動作を説明するための説明図である。It is explanatory drawing for demonstrating operation | movement of an illumination light source. 本発明の第3の実施形態に係る照明装置の外観の一例を示す斜視図である。It is a perspective view which shows an example of the external appearance of the illuminating device which concerns on the 3rd Embodiment of this invention. 図9に示す照明装置の分解斜視図である。It is a disassembled perspective view of the illuminating device shown in FIG. 波長変換面体や集光モジュールを交換可能にした場合を説明するための説明図である。It is explanatory drawing for demonstrating the case where a wavelength conversion surface body and a condensing module are made exchangeable. 本発明の第4の実施形態に係る表示装置の一例を示す分解斜視図である。It is a disassembled perspective view which shows an example of the display apparatus which concerns on the 4th Embodiment of this invention. 背景技術に係る照明器具の外観を示す斜視図である。It is a perspective view which shows the external appearance of the lighting fixture which concerns on background art. 図13に示す照明器具の断面図である。It is sectional drawing of the lighting fixture shown in FIG. 背景技術に係る表示装置の断面図である。It is sectional drawing of the display apparatus which concerns on background art.
符号の説明Explanation of symbols
1,10 照明光源
2 LED
3 励起光源ユニット
4,4a,4b 波長変換面体
5 側壁部
6 蛍光体
7 配光特性
8 基板
11 集光部
12 凹面鏡
13 凹レンズ
14 集光モジュール
20 照明装置
21,31 筐体
30 表示装置
32,34 差込孔
33 支柱
41 透明板
42 シート部材
43 取付部
1,10 Illumination light source 2 LED
3 Excitation light source units 4, 4 a, 4 b Wavelength conversion surface body 5 Side wall part 6 Phosphor 7 Light distribution characteristic 8 Substrate 11 Condensing part 12 Concave mirror 13 Concave lens 14 Condensing module 20 Illumination device 21, 31 Housing 30 Display device 32, 34 Insertion hole 33 Support column 41 Transparent plate 42 Sheet member 43 Mounting portion

Claims (13)

  1. 完全拡散配光を有して第1波長の光を発する複数の発光素子が、それぞれ同一平面上で隣接する他の前記発光素子と互いに所定の間隔だけ離して配設された励起光源ユニットと、
    前記複数の発光素子と対向配置され、前記複数の発光素子から放射された第1波長の光の一部をそのまま透過させると共に当該第1波長の光における残りの一部を前記第1波長の光よりも波長が長い第2波長の光に変換して透過させる波長変換面体と、
    前記複数の発光素子と前記波長変換面体との対向距離を、互いに隣接する前記発光素子における中心点間の距離の2分の1以上に支持するべく前記波長変換面体を前記励起光源ユニットに取り付ける第1の取付手段と
    を備え、
    前記第1波長及び第2波長の光は、微細な凹凸が施された拡散板及び微小なプリズムのうちいずれも通過することなく出射されることを特徴とする照明光源。
    A plurality of light-emitting elements that emit light of the first wavelength having a completely diffuse light distribution, each being disposed at a predetermined distance from another light-emitting element adjacent on the same plane;
    A portion of the first wavelength light emitted from the plurality of light emitting elements is transmitted as it is, and the remaining part of the first wavelength light is transmitted through the first wavelength light. A wavelength conversion facet that converts and transmits light having a second wavelength longer than the wavelength;
    The wavelength conversion plane is attached to the excitation light source unit so that the opposing distance between the plurality of light emitting elements and the wavelength conversion plane is at least half of the distance between the center points of the light emitting elements adjacent to each other. 1 attachment means, and
    The illumination light source, wherein the light having the first wavelength and the second wavelength is emitted without passing through any of a diffuser plate and minute prisms having fine irregularities.
  2. 前記第1の取付手段は、前記波長変換面体を前記励起光源ユニットに脱着可能に構成されていることを特徴とする請求項1記載の照明光源。   2. The illumination light source according to claim 1, wherein the first attachment unit is configured to be able to attach and detach the wavelength conversion surface body to the excitation light source unit.
  3. 完全拡散配光を有して第1波長の光を発する複数の発光素子が、それぞれ同一平面上で隣接する他の前記発光素子と互いに所定の間隔だけ離して配設された励起光源ユニットと、
    前記複数の発光素子とそれぞれ対向配置され、前記複数の発光素子から放射された第1波長の光の一部をそのまま透過させると共に当該第1波長の光における残りの一部を前記第1波長の光よりも波長が長い第2波長の光に変換して透過させる複数の波長変換面体と、
    前記複数の波長変換面体を透過する前記第1及び第2の波長の光を、前記各波長変換面体について集光する複数の集光部と
    前記各発光素子と前記各波長変換面体との対向距離を、互いに隣接する前記発光素子における中心点間の距離の2分の1以下に支持するべく前記各波長変換面体及び集光部を前記励起光源ユニットに取り付ける第2の取付手段とを備え、
    前記各集光部は、底部に開口部が設けられた凹面鏡を含み、
    前記各波長変換面体は、前記各凹面鏡の前記底部の開口部を塞ぐように設けられている
    ことを特徴とする照明光源。
    A plurality of light-emitting elements that emit light of the first wavelength having a completely diffuse light distribution, each being disposed at a predetermined distance from another light-emitting element adjacent on the same plane;
    Each of the plurality of light emitting elements is arranged to face each other, and a part of the first wavelength light emitted from the plurality of light emitting elements is transmitted as it is, and the remaining part of the first wavelength light is transmitted to the first wavelength. A plurality of wavelength conversion planes that convert and transmit light having a second wavelength longer than that of light;
    A plurality of condensing units for condensing the light of the first and second wavelengths that pass through the plurality of wavelength conversion planes with respect to each wavelength conversion plane ; and
    Exciting the wavelength conversion planes and the light converging unit to support the opposing distance between the light emitting elements and the wavelength conversion planes to be less than or equal to one half of the distance between the center points of the light emitting elements adjacent to each other. A second attachment means for attaching to the light source unit;
    Each of the light collecting portions includes a concave mirror having an opening at the bottom,
    Each said wavelength conversion surface body is provided so that the opening part of the said bottom part of each said concave mirror may be plugged up, The illumination light source characterized by the above-mentioned .
  4. 完全拡散配光を有して第1波長の光を発する複数の発光素子が、それぞれ同一平面上で隣接する他の前記発光素子と互いに所定の間隔だけ離して配設された励起光源ユニットと、
    前記複数の発光素子とそれぞれ対向配置され、前記複数の発光素子から放射された第1波長の光の一部をそのまま透過させると共に当該第1波長の光における残りの一部を前記第1波長の光よりも波長が長い第2波長の光に変換して透過させる複数の波長変換面体と、
    前記複数の波長変換面体を透過する前記第1及び第2の波長の光を、前記各波長変換面体について集光する集光部と、
    前記各発光素子と前記各波長変換面体との対向距離を、互いに隣接する前記発光素子における中心点間の距離の2分の1以下に支持するべく前記各波長変換面体及び集光部を前記励起光源ユニットに取り付ける第2の取付手段とを備え、
    前記第1波長及び第2波長の光は、微細な凹凸が施された拡散板及び微小なプリズムのうちいずれも通過することなく出射されることを特徴とする照明光源。
    A plurality of light-emitting elements that emit light of the first wavelength having a completely diffuse light distribution, each being disposed at a predetermined distance from another light-emitting element adjacent on the same plane;
    Each of the plurality of light emitting elements is arranged to face each other, and a part of the first wavelength light emitted from the plurality of light emitting elements is transmitted as it is, and the remaining part of the first wavelength light is transmitted to the first wavelength. A plurality of wavelength conversion planes that convert and transmit light having a second wavelength longer than that of light;
    A condensing unit that condenses the light of the first and second wavelengths transmitted through the plurality of wavelength conversion planes, with respect to each wavelength conversion plane; and
    Exciting the wavelength conversion planes and the light converging unit to support the opposing distance between the light emitting elements and the wavelength conversion planes to be less than or equal to one half of the distance between the center points of the light emitting elements adjacent to each other. A second attachment means for attaching to the light source unit;
    The illumination light source, wherein the light having the first wavelength and the second wavelength is emitted without passing through any of a diffuser plate and minute prisms having fine irregularities.
  5. 前記第2の取付手段は、前記波長変換面体及び集光部を前記励起光源ユニットに脱着可能に構成されていることを特徴とする請求項3又は4記載の照明光源。   5. The illumination light source according to claim 3, wherein the second attachment unit is configured to be able to attach and detach the wavelength conversion plane body and the condensing unit to the excitation light source unit.
  6. 前記第1波長の光は青色波長の光であり、前記波長変換面体は白色光を出射するべく前記青色波長の光の一部を前記第2波長の光として黄色波長の光に変換する黄色蛍光体を備えることを特徴とする請求項1〜5のいずれか1項に記載の照明光源。   The first wavelength light is blue wavelength light, and the wavelength conversion facet converts a part of the blue wavelength light into yellow wavelength light as the second wavelength light to emit white light. The illumination light source according to claim 1, comprising a body.
  7. 前記第1波長の光は緑色波長の光であり、前記波長変換面体は白色光を出射するべく前記緑色波長の光の一部を前記第2波長の光として橙色波長の光に変換する橙色蛍光体を備えることを特徴とする請求項1〜5のいずれか1項に記載の照明光源。   The light of the first wavelength is light of green wavelength, and the wavelength conversion facet converts the part of the light of green wavelength into the light of orange wavelength as the light of the second wavelength so as to emit white light. The illumination light source according to claim 1, comprising a body.
  8. 前記第1波長の光は緑色波長の光であり、前記波長変換面体は白色光を出射するべく前記緑色波長の光の一部を前記第2波長の光として赤色波長の光に変換する赤色蛍光体と緑色波長の光に変換する緑色蛍光体とを備えることを特徴とする請求項1〜5のいずれか1項に記載の照明光源。   The first wavelength light is green wavelength light, and the wavelength conversion facet converts a part of the green wavelength light into red wavelength light as the second wavelength light to emit white light. The illumination light source according to any one of claims 1 to 5, comprising a body and a green phosphor that converts the light into light having a green wavelength.
  9. 前記第1波長の光は紫外線波長の光であり、前記波長変換面体は白色光を出射するべく前記紫外線波長の光の一部を前記第2波長の光として赤色波長の光に変換する赤色蛍光体と緑色波長の光に変換する緑色蛍光体と青色波長の光に変換する青色蛍光体とを備えることを特徴とする請求項1〜5のいずれか1項に記載の照明光源。   The light having the first wavelength is light having an ultraviolet wavelength, and the wavelength converting facet converts red light having the second wavelength as light having the second wavelength into red light to emit white light. The illumination light source according to any one of claims 1 to 5, further comprising: a green phosphor that converts light into a green wavelength light and a blue phosphor that converts light into a blue wavelength light.
  10. 光を発する照明光源と、
    前記照明光源を収容する筐体とを備え、
    前記照明光源は、請求項1又は2記載の照明光源であり、
    前記照明光源が備える波長変換面体は、セードとして用いられること
    を特徴とする照明装置。
    An illumination light source that emits light;
    A housing for housing the illumination light source,
    The illumination light source is the illumination light source according to claim 1 or 2,
    The illumination device characterized in that the wavelength conversion face provided in the illumination light source is used as a shade.
  11. 前記波長変換面体は、蛍光体を備えていることを特徴とする請求項10記載の照明装置。   The lighting device according to claim 10, wherein the wavelength conversion surface body includes a phosphor.
  12. 光を発する照明光源と、
    前記照明光源を収容する筐体とを備え、
    前記照明光源は、請求項3〜5のいずれか1項に記載の照明光源であること
    を特徴とする照明装置。
    An illumination light source that emits light;
    A housing for housing the illumination light source,
    The illumination device according to claim 3, wherein the illumination light source is the illumination light source according to claim 3.
  13. 光を発する照明光源と、
    前記照明光源を収容する筐体とを備え、
    前記照明光源は、請求項1又は2記載の照明光源であり、
    前記照明光源が備える波長変換面体は、前記第1波長の光を前記第2波長の光に変換する蛍光体が、表示しようとする文字又は図形を表すべく配置されていること
    を特徴とする表示装置。
    An illumination light source that emits light;
    A housing for housing the illumination light source,
    The illumination light source is the illumination light source according to claim 1 or 2,
    The wavelength conversion plane provided in the illumination light source is characterized in that the phosphor that converts the light of the first wavelength into the light of the second wavelength is arranged to represent a character or a figure to be displayed. apparatus.
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