JP6527737B2 - Planar imaging optical system surface light source and display box and imaging optical system illumination system using the same - Google Patents
Planar imaging optical system surface light source and display box and imaging optical system illumination system using the same Download PDFInfo
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Description
本発明は、板状結像光学系面光源並びにこれを用いた展示箱及び結像光学系照明システムに関し、特に、その光源に含まれる平面状光放射体が、その平面状放射面の面内輝度均一性に優れる光放射体、例えば有機ＥＬパネル、である光源、展示箱およびシステムに関する。 The present invention relates to a plate-like imaging optical system surface light source, and a display box and an imaging optical system illumination system using the same, and in particular, a planar light emitter contained in the light source is in-plane of its planar radiation surface. The present invention relates to a light source that is a light emitter having excellent luminance uniformity, such as an organic EL panel, a display box, and a system.
近年、白熱灯や蛍光灯に変わる照明光源として有機ＥＬ光源が注目され、多くの研究がなされている。また、テレビに代表されるディスプレイ部材においても液晶方式やプラズマ方式に変わる方式として有機ＥＬ方式が注目されている。 In recent years, organic EL light sources have attracted attention as illumination light sources to be replaced with incandescent lamps and fluorescent lamps, and much research has been conducted. Further, also in display members represented by a television, an organic EL system has attracted attention as a system changing to a liquid crystal system or a plasma system.
ここで有機ＥＬ光源は、ガラス基板や透明樹脂フィルム等の基材に、有機ＥＬ素子を積層したものである。また、有機ＥＬ素子は、一方又は双方が透光性を有する２つの電極を対向させ、この電極の間に有機化合物からなる発光層を含む機能層を積層したものである。有機ＥＬ素子は、発光層内で電子と正孔とが再結合することにより発光する。有機ＥＬ光源は、自発光デバイスであるため、ディスプレイ材料として使用すると高コントラストの画像を得ることができる。また、発光層の材料を適宜選択することにより、種々の波長の光を発光することができる。さらに、白熱灯や蛍光灯に比べて厚さが極めて薄く、且つ、面上に発光するので、設置場所の制約が少ない。 Here, the organic EL light source is obtained by laminating an organic EL element on a substrate such as a glass substrate or a transparent resin film. Further, the organic EL device is a device in which two electrodes, one or both of which are translucent, are opposed to each other, and a functional layer including a light emitting layer made of an organic compound is laminated between the electrodes. The organic EL element emits light by recombination of electrons and holes in the light emitting layer. Since the organic EL light source is a self light emitting device, it can be used as a display material to obtain a high contrast image. In addition, light of various wavelengths can be emitted by appropriately selecting the material of the light emitting layer. Furthermore, the thickness is extremely thin compared to incandescent lamps and fluorescent lamps, and since light is emitted on the surface, there are few restrictions on the installation location.
有機ＥＬ光源の代表的な層構成は、ボトムエミッション型と称される構成であり、一般に、透光性のガラス基板に、透明電極層と、機能層と、裏面電極層が積層され、これらが封止部によって封止されたものであり、発光層で発光した光がガラス基板を介して放射される構造である。以下、本明細書においてボトムエミッション型の有機ＥＬ光源パネルのことをＢＥＰと省略して記載することとする。ここで、機能層は、複数の有機化合物を含む薄膜が積層されたものである。代表的な機能層の構成は、正孔注入層、正孔輸送層、発光層、電子輸送層、電子注入層、ブロック層、電荷発生層等を含む構成であり、この中で、発光に寄与する発光層が必須の構成である。このような層構成の中で、対向する電極層及びこれに挟持された機能層について、これらの層の重畳部分の両電極層を含む部分が有機ＥＬ素子であり、両電極層間への電圧の印加により、発光層が発光する。 A typical layer configuration of the organic EL light source is a configuration referred to as a bottom emission type, and in general, a transparent electrode layer, a functional layer, and a back surface electrode layer are laminated on a translucent glass substrate, It is a structure sealed by a sealing part, and is a structure where the light emitted by the light emitting layer is emitted through the glass substrate. Hereinafter, in the present specification, the bottom emission type organic EL light source panel will be abbreviated to BEP and described. Here, the functional layer is a stack of thin films containing a plurality of organic compounds. A typical functional layer configuration is a configuration including a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, an electron injection layer, a block layer, a charge generation layer, etc. The light emitting layer is an essential component. In such a layer configuration, the portion including the both electrode layers of the overlapping portion of these layers is the organic EL element in the opposing electrode layers and the functional layer sandwiched therebetween, and the voltage between the both electrode layers is By the application, the light emitting layer emits light.
このような有機ＥＬ光源の応用製品として、例えば、特許文献１は、必要な光量を得ることが可能なラインヘッドモジュールを開示している。この特許文献１のラインヘッドモジュールは、有機ＥＬ素子を主走査方向ｘに整列配置したラインヘッドと、有機ＥＬ素子からの出射光を主走査方向ｘについて略平行化する第１光学手段と、第１光学手段からの出射光を副走査方向ｙについて集光する第２光学手段とが、順に密着して配置されている。そして、有機ＥＬ素子の発光面は、主走査方向ｘの長さより副走査方向ｙの長さの方が長くなっており、例えば、第１光学手段はプリズムシートであり、第２光学手段はシリンドリカルレンズである。 As an application product of such an organic EL light source, for example, Patent Document 1 discloses a line head module capable of obtaining a necessary amount of light. The line head module of Patent Document 1 includes a line head in which organic EL elements are aligned in the main scanning direction x, first optical means for substantially collimating light emitted from the organic EL elements in the main scanning direction x, and A second optical unit that condenses the light emitted from the first optical unit in the sub-scanning direction y is disposed in close contact with the second optical unit. The light emitting surface of the organic EL element is longer in the sub scanning direction y than in the main scanning direction x. For example, the first optical unit is a prism sheet, and the second optical unit is a cylindrical. It is a lens.
特許文献１のラインヘッドモジュールは、有機ＥＬ素子の発光点が精度良く作り込める点を活かしたものであり、例えば、発光点をピクセル状に配列する場合には、発光ダイオード（ＬＥＤ）では、多数の発光点を精度良く配列することは極めて困難である。また、許文献１では、発光素子からの出射光のほとんど全てをスポット照射に利用するため、有機ＥＬ素子からなるラインヘッドと第１及び第２の光学手段とを密着することで結果的に薄いラインヘッドモジュールを実現している。このようにして特許文献１では、発光素子からの出射光を主走査方向ｘについて第１光学手段にて略平行化し、また、スポットの主走査方向ｘ幅を位置精度良く所定値に設定し、さらに、第１光学手段からの出射光を副走査方向ｙについて集光して細いスポット照射することで、スポット光量が確保されたラインヘッドモジュールを実現している。 The line head module of Patent Document 1 takes advantage of the point that the light emitting points of the organic EL element can be accurately formed. For example, when the light emitting points are arranged in a pixel shape, many light emitting diodes (LEDs) are used. It is extremely difficult to precisely arrange the light emission points of. Further, in Patent Document 1, since almost all of the light emitted from the light emitting element is used for spot irradiation, the line head made of the organic EL element is in close contact with the first and second optical means, resulting in thinness. A line head module is realized. In this manner, in Patent Document 1, the first optical means collimates the light emitted from the light emitting element in the main scanning direction x by the first optical means, and sets the width of the spot in the main scanning direction x to a predetermined value with high positional accuracy. Furthermore, by condensing the emitted light from the first optical means in the sub scanning direction y and irradiating the thin spot, a line head module in which the spot light amount is secured is realized.
しかしながら、特許文献１のラインヘッドモジュールは、有機ＥＬ素子が面光源であり、また、その面内の輝度均一性に優れ、さらに、柔らかく高演色性の放射光による高品質の照明が可能な光源であることを活かした応用製品とはなっておらず、有機ＥＬ素子の照明光源としてのポテンシャルの顕在化が待たれる。 However, in the line head module of Patent Document 1, the organic EL element is a surface light source, and the light source is excellent in the uniformity of luminance in the surface, and further a light source capable of high quality illumination by soft light with high color rendering. It is not an applied product that makes use of the fact that the potential of the organic EL element as an illumination light source is expected to be realized.
一方、ショーウィンドウ等において展示物に照明する場合、一般に、従来光源である白熱灯や蛍光灯が用いられているが、掘り込み照明としたり、スポット照明としたりすることが必要であり、単に光源を設置するだけでは不十分である。即ち、展示物の観察者に光源の光放射面が直接視認されないよう、フードで光源全体を覆ったり、展示室の床面に窪みを設けてそこに光源を設置したりする必要がある。また、このような従来光照明では、展示物面内での照度分布が、光源の輝度分布や、光源からの距離に応じて変化してしまい、展示物を美しく照明するには、相当の経験や技術を要するものと考えられる。 On the other hand, when lighting an exhibit at a show window etc., generally, incandescent lamps and fluorescent lamps, which are conventional light sources, are generally used, but it is necessary to use digging lighting or spot lighting, and it is simply a light source It is not enough to install the That is, it is necessary to cover the entire light source with a hood or to provide a recess on the floor surface of the exhibition room and place the light source there so that the light emission surface of the light source is not directly viewed by the observer of the exhibit. In addition, with such conventional light illumination, the illuminance distribution in the display surface changes according to the luminance distribution of the light source and the distance from the light source, and considerable experience is required to illuminate the exhibit beautifully. It is considered that the technology needs to be
このような状況の下、有機ＥＬ素子の照明光源としてのポテンシャル顕在化を目指し、新たなコンセプトに基づき為された本発明は、高照度均一性の照射対象面を有し、また、照射対象面に比べて小さい光放射面を有し、さらに、その全体の厚みが薄い光源の提供を目的とする。 Under such circumstances, the present invention, based on a new concept, aims to realize the potential as an illumination light source of an organic EL element, and has a surface to be irradiated with high illuminance uniformity and a surface to be irradiated. It is an object of the present invention to provide a light source having a smaller light emitting surface than that of the light source and further having a thin overall thickness.
上述の状況に鑑み、本発明者は、適切に作製された有機ＥＬ素子が優れた面内輝度均一性を有することに着目し、この輝度均一性を照射対象面の照度均一性に反映させることを試みた。即ち、有機ＥＬ素子を含む有機ＥＬパネルに代表される平面状光放射体であって、高面内輝度均一性を有する平面状放射面を有する平面状光放射体の平面状放射面を、全体の厚みを一定限度内に抑えつつ、照射対象面に結像することで、高い照度均一性有する板状結像光学系面光源を実現できるのではないかと考えた。また、このようにして実現した板状結像光学系面光源は、その平面状光放射体として有機ＥＬパネルを用いることにより、有機ＥＬ素子の自然光に近い柔らかい光で照明可能な光源とすることができる。 In view of the above-described situation, the inventor of the present invention focuses on the fact that the organic EL device appropriately manufactured has excellent in-plane luminance uniformity, and reflects this luminance uniformity on the illuminance uniformity of the irradiation target surface. I tried. That is, it is a flat light emitter represented by an organic EL panel including an organic EL element, and the entire flat emission surface of the flat light emitter having a flat emission surface having high in-plane luminance uniformity is It was thought that a plate-like imaging optical system surface light source having high uniformity of illumination could be realized by forming an image on the irradiation target surface while suppressing the thickness of the light emitting material within a certain limit. In addition, the plate-like imaging optical system surface light source realized in this way should be a light source that can be illuminated with soft light close to the natural light of the organic EL element by using the organic EL panel as its planar light emitter. Can.
このような考えのもと導き出された本発明は、板状平面光源、及び、板状結像部材を含
み、かつ、照射対象面Ｃに光を照射する最大厚みＴBMAXが５０ｍｍ以下の板状結像光
学系面光源であって、
該板状平面光源が、平面状光放射体、及び、該平面状光放射体から放射された放射光を
出射光として出射する平面状出射面Ａを含み
該平面状光放射体の平面状放射面が面内輝度均一性を有し、
該板状結像部材が、該出射光を受光可能であり、かつ、該受光した光を照射光として該
照射すると共に、該平面状出射面Ａの少なくとも一方向を該照射対象面Ｃに結像する平面
状照射面Ｂを含み、さらに、
該平面状照射面Ｂの面積ＳBが、該平面状出射面Ａの面積ＳAの１倍以上、１．５倍以
下であり、かつ、該照射対称面Ｃが、該面内輝度均一性が反映された照度均一性を有することを特徴とする板状結像光学系面光源に関する。
The present invention derived under such a concept includes a plate-like planar light source and a plate-like imaging member, and a plate-like member having a maximum thickness TBMAX of 50 mm or less for irradiating light to the irradiation target surface C. An imaging optical system surface light source
The planar planar light source includes a planar light emitter, and a planar exit surface A that emits radiation light emitted from the planar light emitter as an exit light.
The planar radiation surface of the planar light emitter has in-plane luminance uniformity,
The plate-like imaging member is capable of receiving the emitted light, and irradiates the received light as irradiation light, and at least one direction of the planar emission surface A is connected to the irradiation target surface C. Including a planar illuminated surface B to be imaged;
Area S B of the plane-shaped irradiation surface B is 1 times or more the area S A of the plane-shaped exit surface A, Ri der 1.5 times or less, and the irradiation symmetry plane C is said surface in luminance uniformity relates plate imaging optical system surface light source, wherein Rukoto to have a uniform illuminance of gender is reflected.
参考のため図１に概要を示す。即ち、図１は、本発明の一実施形態における板状結像光学系面光源１を説明する、光源１の断面構成図を含み、これと照射対象面Ｃとの関係を示し、本発明における結像関係を点線で示す説明図である。図１においては、板状平面光源２、平面状光放射体２０、平面状放射面Ｄ２０１、平面状出射面Ａ２１、板状結像部材３、平面状照射面Ｂ３１、照射対象面Ｃ４である。 An outline is shown in FIG. 1 for reference. That is, FIG. 1 includes a cross-sectional view of the light source 1 for explaining the plate-like imaging optical system surface light source 1 in one embodiment of the present invention, and shows the relationship between this and the irradiation target surface C. It is explanatory drawing which shows an imaging relationship with a dotted line. In FIG. 1, the flat planar light source 2, the flat light emitter 20, the flat radiation surface D 201, the flat emission surface A 21, the flat imaging member 3, the flat irradiation surface B 31, and the irradiation target surface C 4.
このような本発明の板状結像光学系面光源は、その平面状光放射体の平面状放射面の有する優れた面内輝度均一性が反映されることで、照射対象面Ｃが優れた照度均一性を有し、結像光学系光源であっても、薄く、かつ、照射対象面Ｃに比べて小さい面積の光源となる。加えて、照射対象面Ｃの展示物等のみに光照射可能なので、電力ロス、即ち、消費電力が小さい照明となると共に、展示物等を周囲から浮き上がらせ美しく照明することができる。 Such a plate-like imaging optical system surface light source of the present invention is excellent in the irradiation target surface C by reflecting the excellent in-plane luminance uniformity of the planar radiation surface of the planar light emitter. Even in the case of an imaging optical system light source, the light source has illumination uniformity and is thin and has a smaller area than the surface C to be irradiated. In addition, since light can be emitted only to the display object etc. on the irradiation target surface C, power loss, that is, illumination with small power consumption can be achieved, and the display object etc. can be floated up from the surroundings and beautifully illuminated.
また、前記平面状光放射体は、有機ＥＬパネルであることが好ましく、自然光に近い柔らかい光で照明可能である。 The planar light emitter is preferably an organic EL panel, and can be illuminated with soft light close to natural light.
また、前記板状平面光源は、前記平面状出射面Ａを有する板状集光部材を含むことが好ましく、かつ、前記平面状光放射体は、前記放射する平面状放射面Ｄを含むことが好ましく、さらに、前記面積ＳＡは、該平面状放射面Ｄの面積ＳＤの１倍以上、１．５倍以下であることが好ましく、かつ、
前記板状平面光源の最大厚みＴＡＭＡＸは、４５ｍｍ以下であることが好ましく、平面状出射面Ａにおける出射方向を本発明に係る板状結像部材の方向に揃えることで、照射対象面Ｃでの照度を増大できる。
Preferably, the flat planar light source includes a flat focusing member having the flat emission surface A, and the flat light emitter includes the flat radiation surface D to be emitted. preferably, furthermore, the area S a is more than 1 times the area S D of the plane-shaped emitting surface D, is preferably 1.5 times or less, and,
The maximum thickness TAMAX of the flat planar light source is preferably 45 mm or less, and the emitting direction on the flat emitting surface A is aligned with the direction of the flat imaging member according to the present invention. Can increase the illuminance of
また、前記平面状放射面Ｄの前記一方向が、実像または虚像として、該平面状出射面Ａに結像されることが好ましく、本発明に係る平面状放射面の有する優れた面内輝度均一性がより正確に照射対象面Ｃに反映されることで、より優れた照度均一性の光源となる。 In addition, it is preferable that the one direction of the flat radiation surface D is imaged on the flat emission surface A as a real image or a virtual image, and the excellent in-plane luminance uniformity of the flat radiation surface according to the present invention. By reflecting the reflectance more accurately on the irradiation target surface C, it becomes a light source with better illuminance uniformity.
また、前記板状結像部材は、結像素子として、前記平面状出射面Ａと平行な主面、及び焦点ｆを有する、凸レンズ又はフレネルレンズを含むことが好ましく、現実的かつ安価に本発明の板状結像光学系面光源を実現できる。より好ましくは、フレネルレンズを用いることであり、さらに好ましくは、前記一方向に直角な他方向に平行に分割されたレンズ面を備えるリニアフレネルレンズを用いることである。 In addition, the plate-like image forming member preferably includes a convex lens or a Fresnel lens having a principal surface parallel to the planar light emitting surface A and a focal point f as an image forming element, and the present invention practically and inexpensively The plate-like imaging optical system surface light source can be realized. More preferably, a Fresnel lens is used, and more preferably, a linear Fresnel lens having a lens surface divided in parallel to another direction perpendicular to the one direction is used.
参考のため図２に概要を示す。即ち、図２は、本発明の別の一実施形態における板状結像光学系面光源１を説明する、本発明に係る平面状出射面Ａの一方向（紙面上下方向）の本発明に係る照射対象面Ｃへの結像を説明する、本発明に係る結像素子での結像作図を直線で含み、本発明に係る結像素子を等価レンズ（一点鎖線）とレンズ機能とで表した、説明図である。図２においては、平面状光放射体２０、平面状出射面Ａ２１、板状結像部材３、平面状照射面Ｂ３１、結像素子３２、照射対象面Ｃ４である。 An outline is shown in FIG. 2 for reference. That is, FIG. 2 illustrates the plate-like imaging optical system surface light source 1 according to another embodiment of the present invention, according to the present invention in one direction (vertical direction in the drawing) of the planar exit surface A according to the present invention. The image formation with the imaging device according to the present invention is described as a straight line, and the imaging device according to the present invention is represented by an equivalent lens (dashed dotted line) and a lens function. , It is explanatory drawing. In FIG. 2, the planar light emitter 20, the planar exit surface A21, the plate-like imaging member 3, the planar illumination surface B31, the imaging element 32, and the surface C4 to be illuminated.
また、前記平面状放射面Ｄを、その前記一方向（Ｙ方向）の長さＬＹが、その前記一方向と直角な他方向（Ｘ方向）の長さＬＸより短い、横長長方形とすることが好ましく、かつ、
前記結像素子の主面を、前記平面状放射面Ｄと平行とすることが好ましく、横長の展示物を、より少ない光源で。均一かつ美しく照明することができる。
Further, the planar radiation surface D is a horizontally long rectangle whose length L Y in the one direction (Y direction) is shorter than the length L X in the other direction (X direction) perpendicular to the one direction. Is preferred, and
It is preferable to make the main surface of the imaging element parallel to the planar radiation surface D, and use a less long light source for the display object. It can be illuminated uniformly and beautifully.
また、前記平面状出射面Ａ内の点ａから前記結像素子の主面上に下ろした垂線の足を点ｂとしたときに、前記面積ＳＡの８０％以上に相当する点ａに対応する点ｂが、前記主面において、前記主面上の主点を通る水平線で分割される上下の面の片方の面に偏って存在するようにすることが好ましく、本発明の光源を展示物に対してオフセットした位置に配置することで、観察者の視界を遮ることなく光源を配置可能である。 Further, when a perpendicular foot drawn from a on the main surface of the imaging element in terms of the planar exit surface in A and a point b, corresponding to a point corresponding to 80% or more of the area S A Preferably, the light source point of the present invention is displayed on the main surface on one of the upper and lower surfaces divided by the horizontal line passing through the principal point on the main surface. By arranging the light source at an offset position with respect to the light source, it is possible to arrange the light source without blocking the view of the observer.
また、前記板状集光部材は、集光素子として、プリズムシート又はレンチキュラーレンズを含むことが好ましく、現実的かつ安価に本発明の板状結像光学系面光源を実現できる。より好ましくは、前記プリズムシート又はレンチキュラーレンズは、前記一方向と直角な他方向（Ｘ方向）に伸び、かつ、前記照射対象面Ｃに向かう凸部を有する三角形又は半円形の断面を有する。 Further, the plate-like light collecting member preferably includes a prism sheet or a lenticular lens as a light collecting element, and can realize the plate-like imaging optical system surface light source of the present invention realistically and inexpensively. More preferably, the prism sheet or the lenticular lens has a triangular or semicircular cross section having a convex portion extending in the other direction (X direction) perpendicular to the one direction and directed to the irradiation target surface C.
参考のため図３に概要を示す。即ち、図３は、本本発明のさらに別の一実施形態における板状結像光学系面光源１の断面概念図である。図３においては、平面状光放射体２０、板状集光部材２２、結像素子３２である。 An outline is shown in FIG. 3 for reference. That is, FIG. 3 is a cross-sectional conceptual view of the plate-like imaging optical system surface light source 1 in still another embodiment of the present invention. In FIG. 3, the planar light emitter 20, the plate-like condensing member 22, and the imaging element 32 are provided.
また本発明は、このような本発明の板状結像光学系面光源を用いた結像光学系照明システムであって、
前記平面状出射面Ａと前記平面状照射面Ｂとの間隔をＤＡＢ、前記平面状照射面Ｂと前記照射対象面Ｃとの間隔をＤＢＣとしたときに、下記（数式１）を満たすことを特徴とする照明システムに関し、このような範囲内において、本発明に係る照度均一性の効果がより効果的に奏させしめることができる。
The present invention is also an imaging optical system illumination system using such a plate-like imaging optical system surface light source of the present invention,
Assuming that the distance between the flat emission surface A and the flat irradiation surface B is D AB , and the distance between the flat irradiation surface B and the irradiation target surface C is D BC , the following Equation 1 is satisfied. With regard to the illumination system characterized in that, within such a range, the effect of the illumination uniformity according to the present invention can be more effectively exhibited.
またさらに、本発明は、本発明の板状結像光学系面光源を備える展示箱に関する。 Furthermore, the present invention relates to a display box provided with the plate-like imaging optical system surface light source of the present invention.
本発明の光源は、高照度均一性の照射対象面を有し、また、照射対象面に比べて小さい光放射面を有し、さらに、その全体の厚みが薄い板状結像光学系面光源である。 The light source of the present invention has a surface to be irradiated with high illuminance uniformity, has a light emitting surface smaller than the surface to be irradiated, and has a thin plate-like imaging optical system surface light source. It is.
以下、図１乃至図３を用いて本発明の実施形態について説明する。なお、本発明は以下に記載の実施形態に限定されるものではなく当業者の技術常識内で種々変更が可能である。 Hereinafter, an embodiment of the present invention will be described using FIGS. 1 to 3. The present invention is not limited to the embodiments described below, and various modifications can be made within the technical common knowledge of those skilled in the art.
（板状結像光学系面光源１）
本発明の板状結像光学系面光源１は、板状平面光源２、及び板状結像部材３を含み、照射対象面Ｃ４に光を照射する光源であり、その最大厚みＴＢＭＡＸが５０ｍｍ以下と薄いことを一つの特徴としており、そのためには、前記板状平面光源２に含まれる平面状光放射体２０を有機ＥＬパネルとすることが好ましい。
(Planar imaging optical system surface light source 1)
Plate imaging optical system faces the light source 1 of the present invention, the plate-shaped plane light source 2, and includes a plate-shaped focusing member 3, a light source for irradiating light to the irradiation target surface C4, the maximum thickness T BMAX of 50mm One feature is that it is thin as follows, and for that purpose, it is preferable to use the planar light emitter 20 included in the flat planar light source 2 as an organic EL panel.
本発明の板状結像光学系面光源１の最大の特徴は、本発明に係る板状平面光源２が、前記平面状光放射体２０から放射された放射光を出射光として出射する平面状出射面Ａ２１を有し、この平面状出射面Ａ２１の少なくとも一方向を照射対象面Ｃ４に結像する平面状照射面Ｂ３１を、前記板状結像部材３が有することである。このようにすることで、平面状出射面Ａ２１の輝度分布を、照射対象面Ｃ４の照度分布として再現することができ、平面状出射面Ａ２１の輝度分布を均一化することで、照射対象面Ｃ４の照度分布を均一化できる。平面状出射面Ａ２１の輝度分布を均一化するためには、前記平面状光放射体２０の平面状放射面Ｄ２０１の輝度分布を均一にすることが重要であり、その観点から、前記平面状光放射体２０を有機ＥＬパネルとすることが好ましい。 The greatest feature of the plate-like imaging optical system surface light source 1 according to the present invention is that the plate-like planar light source 2 according to the present invention emits the emitted light emitted from the planar light emitter 20 as emitted light. The plate-like imaging member 3 has a planar irradiation surface B31 having an emission surface A21 and imaging at least one direction of the planar emission surface A21 on the irradiation target surface C4. By doing this, it is possible to reproduce the luminance distribution of the planar emission surface A21 as the illuminance distribution of the irradiation target surface C4, and by making the luminance distribution of the planar emission surface A21 uniform, the irradiation target surface C4. Makes it possible to equalize the illuminance distribution of In order to make the luminance distribution of the planar emission surface A21 uniform, it is important to make the luminance distribution of the planar radiation surface D201 of the planar light emitter 20 uniform, from that point of view the planar light It is preferable that the radiator 20 be an organic EL panel.
このような本発明の板状結像光学系面光源１は、例えば、ショーウィンドウ等において展示物に照明する場合等、展示物を展示するための照明として好適であり、掘り込み照明としたり、スポット照明としたりすることが不要であり、かつ、展示物面内での照度分布が小さいので、再現性良く美しく展示することができる。 Such a plate-like imaging optical system surface light source 1 of the present invention is suitable as illumination for displaying an exhibit, for example, when illuminating an exhibit in a show window, etc. Since it is unnecessary to use spot lighting and the illuminance distribution in the display surface is small, it can be beautifully displayed with good reproducibility.
（板状平面光源２）
本発明に係る板状平面光源２は、平面状光放射体２０、及び平面状出射面Ａ２１を含み、その最大厚みＴＡＭＡＸが４５ｍｍ以下と薄いことを一つの特徴としており、そのためには、前記平面状光放射体２０を有機ＥＬパネルとすることが好ましい。部材点数を少なくする観点からは、平面状光放射体（有機ＥＬパネル）２０の平面状放射面Ｄ２０１を、前記平面状出射面Ａ２１とすることもできる。しかし、平面状光放射体（有機ＥＬパネル）２０から放出される光を集光することで、照射対象面Ｃ４に照射される光量、即ち、照射対象面Ｃ４での輝度を向上せしめる観点、及び、前記平面状放射面Ｄ２０１の前記一方向を、実像または虚像として、該平面状出射面Ａ２１に結像せしめることで、本発明に係る照度均一性をより向上させる観点からは、本発明に係る板状平面光源２は、平面状放射面Ｄ２０１と、前記平面状放射面Ｄ２０１との間に、本発明に係る板状集光部材２２を含むことが好ましい。
(Plane-shaped flat light source 2)
The plate-like planar light source 2 according to the present invention includes the planar light emitter 20 and the planar emitting surface A21, and is characterized in that its maximum thickness TAMAX is as thin as 45 mm or less. Preferably, the planar light emitter 20 is an organic EL panel. From the viewpoint of reducing the number of members, the planar radiation surface D201 of the planar light emitter (organic EL panel) 20 can also be the planar emission surface A21. However, by condensing the light emitted from the planar light emitter (organic EL panel) 20, it is possible to improve the amount of light irradiated to the irradiation target surface C4, that is, the luminance on the irradiation target surface C4; According to the present invention, from the viewpoint of further improving the illuminance uniformity according to the present invention, by forming the one direction of the flat radiation surface D201 as a real image or a virtual image on the flat emission surface A21. The plate-like planar light source 2 preferably includes the plate-like light collecting member 22 according to the present invention between the planar radiation surface D201 and the planar radiation surface D201.
本発明に係る板状平面光源２が、本発明に係る板状集光部材２２を含む場合において、本発明に係る平面状出射面Ａ２１の面積ＳＡは、前記平面状放射面Ｄ２０１の面積ＳＤの１倍以上、１．５倍以下であることが、本発明に係る平面状光放射体（有機ＥＬパネル）２０から放射される光を有効に活用することで照射対象面Ｃ４の照度を高めつつ、本発明の板状結像光学系面光源１をコンパクトな光源とする観点から好ましい。 Plate flat light source 2 according to the present invention, when including a plate-like condensing member 22 according to the present invention, the area S A of a planar exit surface A21 of the present invention, the area of the planar radiating surface D201 S By making effective use of the light emitted from the planar light emitter (organic EL panel) 20 according to the present invention to be 1 or more and 1.5 or less times D , the illuminance of the surface C4 to be irradiated can be obtained. It is preferable from the viewpoint of making the plate-like imaging optical system surface light source 1 of the present invention into a compact light source while enhancing it.
（平面状光放射体（有機ＥＬパネル）２０）
本発明に係る平面状光放射体２は、平面状放射面Ｄ２０１から光を放射する平面状の光放射体であれば、従来光源やＬＥＤ光源に拡散板等を付属させた光放射体を使用できるが、上述の理由から、当該放射面の輝度分布が小さいものであることが好ましく、より好ましくは有機ＥＬパネルである。
(Planar light emitter (organic EL panel) 20)
If the planar light emitter 2 according to the present invention is a planar light emitter that emits light from the planar radiation surface D201, the light emitter using a conventional light source or an LED light source attached with a diffusion plate or the like is used Although it is possible, for the above-mentioned reason, it is preferable that the luminance distribution of the said radiation | emission surface is small, More preferably, it is an organic electroluminescent panel.
前記平面状放射面Ｄ２０１は、その一方向の長さが、その一方向と直角な他方向の長さより短い横長長方形であることが、複数の光源を用いず横長の展示物を美しく照明できるという本発明の効果、即ち、横長展示物一光源照明効果を効果的に奏さしめる観点から好ましい。より好ましくは、その前記一方向（Ｙ方向）の長さＬＹが、当該一方向と直角な他方向（Ｘ方向）の長さＬＸより短い平面状放射面Ｄ２０１とすることであり、従って、このような平面状放射面Ｄ２０１を含む、本発明に係る平面状光放射体（有機ＥＬパネル）２０、又は本発明に係る板状平面光源２、あるいは、本発明の板状結像光学系面光源１も、横長長方形であることが好ましい。 The flat radiation surface D201 has a horizontally long rectangular shape whose length in one direction is shorter than the length in the other direction perpendicular to the one direction, so that it is possible to beautifully illuminate a horizontally long exhibit without using a plurality of light sources. It is preferable from the viewpoint of effectively achieving the effect of the present invention, that is, the display object with a wide landscape and a light source. More preferably, the length L Y of the one direction (Y direction) is a flat radiation surface D 201 shorter than the length L X of the other direction (X direction) perpendicular to the one direction, The planar light emitter (organic EL panel) 20 according to the present invention, the planar flat light source 2 according to the present invention, or the plate-like imaging optical system according to the present invention The surface light source 1 is also preferably a horizontally long rectangle.
（有機ＥＬパネル２０）
本発明に係る有機ＥＬパネル２０としては、上述のボトムエミッション型のパネル（ＢＥＰ）以外にも、トップエミッション型のパネル（ＴＥＰ）も使用することができる。
(Organic EL panel 20)
As the organic EL panel 20 according to the present invention, a top emission type panel (TEP) can also be used besides the above-mentioned bottom emission type panel (BEP).
ＢＥＰとしては、例えば、ガラス基板上に、順に、透光性の第１電極層、少なくとも有機化合物を含む発光層、および第２電極層を積層することで、有機ＥＬ発光素子層として形成された有機ＥＬ発光素子を含むものが例示される。好ましくは、有機ＥＬ発光素子への水分の浸入を防止するために、有機ＥＬ発光素子層と接して無機封止層が形成される。 As BEP, for example, an organic EL light emitting element layer is formed by sequentially laminating a light transmitting first electrode layer, a light emitting layer containing at least an organic compound, and a second electrode layer on a glass substrate. What contains an organic electroluminescent light emitting element is illustrated. Preferably, an inorganic sealing layer is formed in contact with the organic EL light emitting element layer in order to prevent water from entering the organic EL light emitting element.
このような有機ＥＬパネル２０は、例えば、その有機ＥＬ発光素子層に複数の発光層を設けることで可視域に複数のブロードピークを有するスペクトルの発光が可能であり、高演色性の光源とすることで、展示物を自然光による照明に近い美しい色彩に見えるように照明できる。このような観点から、本発明に係る有機ＥＬタイルの有機ＥＬ発光素子は白色発光素子であることが好ましい。 Such an organic EL panel 20 can emit light in a spectrum having a plurality of broad peaks in the visible region, for example, by providing a plurality of light emitting layers in the organic EL light emitting element layer, and is a light source with high color rendering. This makes it possible to illuminate the exhibit in a beautiful color close to that of natural light. From such a viewpoint, it is preferable that the organic EL light emitting element of the organic EL tile according to the present invention is a white light emitting element.
透光性第１電極層は、透明導電性材料からなる層であり、好ましい材質は、金属酸化物であり、その中でも、酸化インジウム錫（ＩＴＯ）、インジウム亜鉛酸化物（ＩＺＯ）、酸化錫（ＳｎＯ２）、及び酸化亜鉛（ＺｎＯ）からなる群から選ばれる１種以上が好ましく、薄膜有機発光層から発生した光を効果的に取り出せる点では、透光性が高いＩＴＯあるいはＩＺＯが好ましく、より好ましくはＩＴＯであり、スパッタ法、又はＣＶＤ法によって成膜されたものであることが好ましい。 The translucent first electrode layer is a layer made of a transparent conductive material, and a preferable material is a metal oxide, and among them, indium tin oxide (ITO), indium zinc oxide (IZO), tin oxide ( One or more selected from the group consisting of SnO 2) and zinc oxide (ZnO) is preferred, and ITO or IZO having high translucency is preferred, and more preferred, in that light generated from the thin-film organic light emitting layer can be effectively extracted. Is ITO, which is preferably deposited by sputtering or CVD.
有機化合物を含有する発光層は、電極層に挟持された機能層の内の、実際に発光が生じる層であり、複数の発光層を含む有機ＥＬ発光素子層とすることが高効率の白色発光素子とする観点からは好ましい。このような機能層に用いられる材料としては、一般的な有機ＥＬ発光素子に用いられている材料を使用することができ、例えば、低分子系色素材料や、共役系高分子材料などの公知のものが挙げられる。有機化合物のポリマーやオリゴマーを塗布形成したものを用いることもできるが、好ましくは、各層をいずれも真空蒸着法によって成膜したものであり、高性能の発光パネルとすることができる。 The light emitting layer containing the organic compound is a layer which actually emits light among the functional layers sandwiched by the electrode layers, and it is a white light emitting device with high efficiency to be an organic EL light emitting element layer including a plurality of light emitting layers. It is preferable from the viewpoint of making an element. As a material used for such a functional layer, a material used for a general organic EL light emitting device can be used, and for example, known materials such as low molecular weight pigment materials and conjugated polymer materials The thing is mentioned. It is also possible to use one obtained by coating and forming a polymer or an oligomer of an organic compound, but preferably, each layer is formed by vacuum evaporation to form a high performance light emitting panel.
また、この機能層は、正孔注入層、正孔輸送層、発光層、電子輸送層、電子注入層などを含む、複数の層からなる積層多層構造であることが一般的である。さらに、これらの機能層を構成する各層は、真空蒸着法やスパッタ法、ＣＶＤ法、ディッピング法、ロールコート法（印刷法）、スピンコート法、バーコート法、スプレー法、ダイコート法、フローコート法など適宜公知の方法を併用して形成することが可能である。 In addition, this functional layer generally has a laminated multilayer structure consisting of a plurality of layers including a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, an electron injection layer and the like. Furthermore, each layer constituting these functional layers can be formed by vacuum evaporation, sputtering, CVD, dipping, roll coating (printing), spin coating, bar coating, spray, die coating, flow coating, etc. It is possible to form by combining known methods appropriately.
第２電極層は、アルミニウムや銀等の金属薄膜とすることが好ましく、好ましくは、真空蒸着法によって成膜される。 The second electrode layer is preferably a metal thin film of aluminum, silver or the like, and preferably formed by vacuum evaporation.
このような有機ＥＬ発光素子に対して外部からの水分の侵入を防ぐために、封止がなされていることが好ましい。 In order to prevent entry of moisture from the outside into such an organic EL light emitting element, sealing is preferably performed.
封止方法には、平板のガラス板を凹状に窪みを作った封止ガラスキャップや金属製のキャップで有機ＥＬ発光素子を覆い被すキャップ封止や、有機ＥＬ発光素子上に保護膜を製膜し封止する膜封止などがあるが、有機ＥＬパネル２０の厚みを薄くすることで、本発明の板状結像光学系面光源１を薄くする観点からは、膜封止が好ましい。 In the sealing method, cap sealing is performed to cover the organic EL light emitting element with a sealing glass cap in which a flat glass plate is concavely recessed or a metal cap, and a protective film is formed on the organic EL light emitting element There is film sealing for filming and sealing, but film sealing is preferable from the viewpoint of thinning the plate-like imaging optical system surface light source 1 of the present invention by reducing the thickness of the organic EL panel 20.
膜封止の封止膜は、無機膜でも有機膜でもよいが、好ましくは無機封止層とすることであり、その製法も蒸着やスパッタがあるが、好ましくは、シリコン窒化膜等のシリコン合金層をＣＶＤで製膜することである。このような無機封止層は、有機ＥＬ素子への水分の浸入を防止する観点から１μｍ以上１０μｍ以下の平均層厚みとすることが好ましく、素子側から順に、窒素含有シリコン合金層、酸素含有シリコン合金層の２層からなる無機封止層とすることがより好ましい。両合金層の層厚みは１：２〜２：１の範囲でほぼ同じ厚みとすることが好ましい。 The sealing film for film sealing may be an inorganic film or an organic film, but is preferably an inorganic sealing layer, and the manufacturing method is also vapor deposition or sputtering, and preferably a silicon alloy such as a silicon nitride film or the like. The layer is formed by CVD. Such an inorganic sealing layer preferably has an average layer thickness of 1 μm or more and 10 μm or less from the viewpoint of preventing entry of moisture into the organic EL element, and in order from the element side, a nitrogen containing silicon alloy layer, oxygen containing silicon It is more preferable to set it as the inorganic sealing layer which consists of two layers of an alloy layer. The layer thickness of both alloy layers is preferably in the range of 1: 2 to 2: 1 and substantially the same thickness.
また、固体膜封止の場合、機械的な外力によるキズを防ぐために、ＰＥＴフィルムや鉄板等の保護フィルムを外装層として、接着剤や粘着剤で貼り付けることが好ましく、高信頼性パネルとする観点からは粘着剤を用いて貼り付けることである。 In the case of solid film sealing, in order to prevent scratches due to mechanical external force, it is preferable to use a protective film such as a PET film or an iron plate as an exterior layer and stick it with an adhesive or a pressure sensitive adhesive. From the viewpoint, it is to stick using an adhesive.
このような粘着剤層平均厚みは、前記無機封止層との関係で、上述の粘着剤の機能を十分に発揮せしめる観点から、無機封止層の平均厚みより厚いことが好ましい。また、粘着剤の材料としては、その粘弾性の観点から、ゴム系、アクリル系、シリコーン系の群から選ばれる一種以上であることが好ましく、その中でも濡れ性に優れるアクリル系が好ましく、その粘弾性が、０℃〜５０℃、及び周波数１Ｈｚにおける測定時、貯蔵弾性率が１０３Ｐａ以上１０６Ｐａ以下、かつ、貯蔵弾性率が貯蔵弾性率測定値の０．０２倍以上、０．２倍以下であることがさらに好ましい。 Such an adhesive layer average thickness is preferably thicker than the average thickness of the inorganic sealing layer from the viewpoint of sufficiently exhibiting the function of the above-mentioned adhesive in relation to the inorganic sealing layer. Further, the material of the pressure-sensitive adhesive is preferably at least one selected from the group consisting of rubbers, acrylics and silicones from the viewpoint of its viscoelasticity, and among them, acrylics having excellent wettability are preferable, and the viscosity thereof is preferable. When measured at an elasticity of 0 ° C. to 50 ° C. and a frequency of 1 Hz, the storage elastic modulus is 10 3 Pa or more and 10 6 Pa or less, and the storage elastic modulus is 0.02 or more times of the storage elastic modulus measured value, 0.2 More preferably, it is not more than twice.
また、このような有機ＥＬパネル２０は、輝度や色や角度依存性の特性向上ために、そのガラス基板の光射出側、即ち、平面状放射面Ｄ２０１となる面として光散乱性の樹脂層が貼り付けられていることが好ましい。 Further, such an organic EL panel 20 has a light-scattering resin layer as a light emitting side of the glass substrate, that is, a surface to be the flat radiation surface D201 in order to improve characteristics of luminance, color and angle dependency. It is preferable that it is stuck.
（板状集光部材２２）
本発明に係る板状集光部材２２は、本発明に係る平面状光放射体２０から放射された放射光を出射光として出射する平面状出射面Ａ２１を有する部材であって、集光素子として、好ましくは、プリズムシート又はレンチキュラーレンズを含み、より好ましくは、本発明に係る一方向と直角な他方向（Ｘ方向）に伸び、かつ、照射対象面Ｃ４に向かう凸部を有する三角形又は半円形の断面を有する。
(Plate-like light collecting member 22)
The plate-like condensing member 22 according to the present invention is a member having a planar emission surface A 21 that emits radiation light emitted from the planar light emitter 20 according to the present invention as emission light, and as a condensing element Preferably, it includes a prism sheet or a lenticular lens, and more preferably a triangle or a semicircle having a protrusion extending in the other direction (X direction) perpendicular to one direction according to the present invention and directed to the irradiation target surface C4. Have a cross section of
このような集光素子の材料としては、高集光性を確保する観点から、なるべく高屈折率の材料が好ましく、具体的には屈折率が１．５以上２．５以下でることが好ましく、より好ましくは１．５５以上２．０以下であり、さらに好ましくは１．６０以上１．８以下であり、板状の部材、例えば、樹脂フィルム、として安価に入手可能であるとの観点から、アクリル樹脂やポリエステル樹脂が好ましく、より好ましくはポリエチレンナフタレート（ＰＥＮ）である。 As a material of such a light-condensing element, from the viewpoint of securing a high light-condensing property, a material with a high refractive index is preferable. Specifically, the refractive index is preferably 1.5 or more and 2.5 or less, and more preferably Is 1.55 or more and 2.0 or less, more preferably 1.60 or more and 1.8 or less, and from the viewpoint of being inexpensively available as a plate-like member, for example, a resin film, an acrylic resin And polyester resins are preferable, and polyethylene naphthalate (PEN) is more preferable.
（板状結像部材３）
本発明に係る板状結像部材３は、本発明に係る出射光を受光可能な部材であり、かつ、当該受光した光を照射光として照射する平面状照射面Ｂ３１を有する部材であり、好ましくは、平面状出射面Ａ２１の少なくとも一方向を照射対象面Ｃ４に結像する機能を有し、より好ましくは、結像素子３２として、凸レンズ又はフレネルレンズを含む。
(Plate-like imaging member 3)
The plate-like imaging member 3 according to the present invention is a member capable of receiving the emitted light according to the present invention, and is a member having a flat irradiation surface B31 for irradiating the received light as irradiation light. Has a function of imaging at least one direction of the planar exit surface A21 on the irradiation target surface C4, and more preferably, a convex lens or a Fresnel lens is included as the imaging element 32.
平面状照射面Ｂ３１の面積ＳＢは、前記平面状出射面Ａ２１の面積ＳＡの１倍以上、１．５倍以下であることが、前記平面状出射面Ａ２１から出射される光を有効に活用することで照射対象面Ｃ４の照度を高めつつ、本発明の板状結像光学系面光源１をコンパクトな光源とする観点から好ましい。 Area S B of the planar illuminated surface B31 is at least 1 times the area S A of the planar exit surface A21, it is 1.5 times or less, effectively the light emitted from the planar exit surface A21 It is preferable from the viewpoint of making the plate-like imaging optical system surface light source 1 of the present invention a compact light source while enhancing the illuminance of the irradiation target surface C4 by utilizing it.
（結像素子３２）
このような結像素子３２は、前述したように、好ましくは、凸レンズ又はフレネルレンズを含むが、そのレンズは、本発明の効果を効果的に奏さしめる観点から、本発明に係る平面状出射面Ａと平行な主面、及び焦点ｆを有することが好ましく、また、その主面が、平面状放射面Ｄと平行であることが好ましい。
(Imaging element 32)
As described above, such an imaging element 32 preferably includes a convex lens or a Fresnel lens, but from the viewpoint of effectively achieving the effects of the present invention, the lens has a planar exit surface according to the present invention It is preferable to have a main surface parallel to A, and a focal point f, and it is preferable that the main surface be parallel to the planar radiation surface D.
本発明の板状結像光学系面光源１は、その光の主な照射方向を、その板状の形状の垂線より外れる方向とすること、即ち、照射方向をオフセットすることが可能であることを一つの特徴としている。言い換えれば、本発明の板状結像光学系面光源１は、前記結像素子３２を適切な形状のものとすることにより、本発明に係る平面状出射面Ａ内の点ａから結像素子の主面上に下ろした垂線の足を点ｂとしたときに、前記面積ＳＡの８０％以上に相当する点ａに対応する点ｂが、主面において、主面上の主点を通る水平線で分割される上下の面の片方の面に偏って存在せしめることができる。 In the plate-like imaging optical system surface light source 1 of the present invention, the main irradiation direction of the light can be a direction deviated from the perpendicular of the plate-like shape, that is, the irradiation direction can be offset. Is one of the features. In other words, the plate-like image forming optical system surface light source 1 according to the present invention makes the image forming element 32 an appropriate shape so that the point a in the planar emission surface A according to the present invention of when grated perpendicular foot was the point b on the main surface, the area S b point corresponding to the corresponding point a 80% or more of a, the main surface, through the principal point on the main surface It can be biased to one of the upper and lower surfaces divided by the horizontal line.
このような結像素子３２の材料としては、高集光性を確保する観点から、なるべく高屈折率の材料が好ましく、具体的には屈折率が１．５以上２．５以下でることが好ましく、より好ましくは１．５５以上２．０以下であり、さらに好ましくは１．６０以上１．８以下であり、板状の部材、例えば、樹脂フィルム、として安価に入手可能であるとの観点から、アクリル樹脂やポリエステル樹脂が好ましく、より好ましくはポリエチレンナフタレート（ＰＥＮ）である。 As a material of such an imaging element 32, from the viewpoint of securing a high light-condensing property, a material of as high a refractive index as possible is preferable, and specifically, a refractive index of 1.5 or more and 2.5 or less is preferable, and more Preferably, it is 1.55 or more and 2.0 or less, more preferably 1.60 or more and 1.8 or less, and from the viewpoint of being inexpensively available as a plate-like member, for example, a resin film, acrylic Resin and polyester resin are preferable, and polyethylene naphthalate (PEN) is more preferable.
（結像光学系照明システム）
このような本発明の板状結像光学系面光源を用いた結像光学系照明システムにおいては、本発明に係る平面状出射面Ａと本発明に係る平面状照射面Ｂとの間隔をＤＡＢ、平面状照射面Ｂと照射対象面Ｃ４との間隔をＤＢＣとしたときに、下記（数式１）を満たすことが好ましく、本発明の効果を効果的に奏さしめることができる。
(Imaging optics illumination system)
In such an imaging optical system illumination system using the plate-like imaging optical system surface light source of the present invention, the distance between the planar emission surface A according to the present invention and the planar irradiation surface B according to the present invention is D It is preferable that the following (Equation 1) be satisfied when the distance AB between the planar irradiation surface B and the irradiation target surface C4 is D BC, and the effects of the present invention can be exhibited effectively.
１／ｆ−１／ＤＡＢ）＝１／ＤＢＣとしたときの、ＤＢＣと、ＤＡＢ及びｆとの関係を表１に示す。 Table 1 shows the relationship between D BC and D AB and f when 1 / f-1 / D AB ) = 1 / D BC .
ＤＡＢが小さいほど、ｆを小さくする必要があり、また、これらの値をほぼ一致させる必要があり、そのようにした場合に、広範囲のＤＢＣに対して、適用可能な板状結像光学系面光源１となること、そして、そのようにすることが好ましいことが判る。 As D AB is smaller, f needs to be smaller, and these values need to be approximately matched, and in such a case, plate-like imaging optics applicable to a wide range of D BC It turns out that it becomes the system surface light source 1, and it is preferable to do so.
図４は、図２の板状結像光学系面光源１を用いた結像光学系照明システムの一例を示す概念図である。 FIG. 4 is a conceptual view showing an example of an imaging optical system illumination system using the plate-like imaging optical system surface light source 1 of FIG.
本発明の板状結像光学系面光源１は、図４に示すように、一方の方向に長い矩形、例えば横長長方形の巻物、のような展示物を照明器具として好適であり、この場合、展示箱の観察者側の展示物からオフセットした位置に、その非照射面側である裏面を観察者側に向けて配置されることとなる。 The plate-like image forming optical system surface light source 1 of the present invention is suitable as a lighting fixture, as shown in FIG. 4, as an illumination object such as a rectangular long in one direction, for example, a horizontally long rectangular scroll. The back side which is the non-irradiated side is directed to the observer side at a position offset from the exhibit on the observer side of the display box.
１ 板状結像光学系面光源
２ 板状平面光源
２０ 平面状光放射体（有機ＥＬパネル）
２０１平面状放射面Ｄ
２１ 平面状出射面Ａ
２２ 板状集光部材
３ 板状結像部材
３１ 平面状照射面Ｂ
３２ 結像素子
４ 照射対象面Ｃ
1 plate-like imaging optical system surface light source 2 plate-like flat light source 20 flat light emitter (organic EL panel)
201 planar radiation surface D
21 planar exit surface A
22 plate-like light collecting member 3 plate-like image forming member 31 flat irradiation surface B
32 imaging element 4 surface to be illuminated C
Claims (11)
該板状平面光源が、平面状光放射体、及び、該平面状光放射体から放射された放射光を出射光として出射する平面状出射面Ａを含み、
該平面状光放射体の平面状放射面が面内輝度均一性を有し、
該板状結像部材が、該出射光を受光可能であり、かつ、該受光した光を照射光として該照射すると共に、該平面状出射面Ａの少なくとも一方向を該照射対象面Ｃに結像する平面状照射面Ｂを含み、さらに、
該平面状照射面Ｂの面積ＳBが、該平面状出射面Ａの面積ＳAの１倍以上、１．５倍以下であり、かつ、該照射対称面Ｃが、該面内輝度均一性が反映された照度均一性を有することを特徴とする板状結像光学系面光源。 A plate-like imaging optical system surface light source comprising a plate-like planar light source and a plate-like imaging member, and having a maximum thickness TBMAX of 50 mm or less for irradiating light to the surface C to be irradiated,
The planar planar light source includes a planar light emitter, and a planar exit surface A that emits radiation light emitted from the planar light emitter as exit light ,
The planar radiation surface of the planar light emitter has in-plane luminance uniformity,
The plate-like imaging member is capable of receiving the emitted light, and irradiates the received light as irradiation light, and at least one direction of the planar emission surface A is connected to the irradiation target surface C. Including a planar illuminated surface B to be imaged;
Area S B of the plane-shaped irradiation surface B is 1 times or more the area S A of the plane-shaped exit surface A, Ri der 1.5 times or less, and the irradiation symmetry plane C is said surface in luminance uniformity plate imaging optical system surface light source, wherein Rukoto to have a uniform illuminance of gender is reflected.
前記平面状光放射体が、前記放射する平面状放射面Ｄを含み、さらに、
前記面積ＳAが、該平面状放射面Ｄの面積ＳDの１倍以上、１．５倍以下であり、かつ、
前記板状平面光源の最大厚みＴAMAXが、４５ｍｍ以下であることを特徴とする請求項１又は２に記載の板状結像光学系面光源。 The plate-like planar light source includes a plate-like condensing member having the planar emission surface A, and
The planar light emitter comprising the radiating planar emitting surface D, and
The area S A is 1 times or more the area S D of the plane-shaped emitting surface D, is 1.5 times or less, and,
The plate-like imaging optical system surface light source according to claim 1 or 2, wherein the maximum thickness TAMAX of the plate-like planar light source is 45 mm or less.
前記結像素子の主面が、前記平面状放射面Ｄと平行であることを特徴とする請求項５に記載の板状結像光学系面光源。 The planar radiation surface D is a horizontally long rectangle whose length L Y in the one direction (Y direction) is shorter than the length L X in the other direction (X direction) perpendicular to the one direction, and ,
The plate-like imaging optical system surface light source according to claim 5, wherein the principal surface of the imaging element is parallel to the planar radiation surface D.
前記平面状出射面Ａと前記平面状照射面Ｂとの間隔をＤAB、前記平面状照射面Ｂと前記照射対象面Ｃとの間隔をＤBCとしたときに、下記（数式１）を満たすことを特徴とする照明システム。
Assuming that the distance between the flat emission surface A and the flat irradiation surface B is D AB , and the distance between the flat irradiation surface B and the irradiation target surface C is D BC , the following Equation 1 is satisfied. lighting system characterized in that.
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