JP2007227095A - Light mixing member, surface light source device - Google Patents

Light mixing member, surface light source device Download PDF

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JP2007227095A
JP2007227095A JP2006045539A JP2006045539A JP2007227095A JP 2007227095 A JP2007227095 A JP 2007227095A JP 2006045539 A JP2006045539 A JP 2006045539A JP 2006045539 A JP2006045539 A JP 2006045539A JP 2007227095 A JP2007227095 A JP 2007227095A
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light
mixing member
light mixing
source device
guide plate
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Masahiro Goto
正浩 後藤
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Dai Nippon Printing Co Ltd
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Dai Nippon Printing Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a light mixing member and a surface light source device in which light from a plurality of light emitting sources is mixed and emitted in uniform state, and uniform luminance can be obtained regardless of locations even if being a large-sized surface light source device. <P>SOLUTION: A light mixing member 20 is provided separately from a light guide plate 30, and a concave part 21 and a convex part 22 are provided to this light mixing member 20. By installing the concave part 21, three colors of light emitted by a red LED 10R, a blue LED 10B, and a green LED 10G can be mixed. The, by installing the convex part 22, light emitted from the light mixing member 20 can be appropriately converged. Furthermore, reflecting layers R1, R2 are installed on the light mixing member 20, and the light emitted and used in an unnecessary direction is reflected and returned and made to be emitted from the convex part 22. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、液晶表示装置等の照明に用いられる光混合部材、面光源装置に関するものである。   The present invention relates to a light mixing member and a surface light source device used for illumination of a liquid crystal display device or the like.

液晶表示装置等を背面から照明する面光源装置として、発光ダイオード（ＬＥＤ）を用いたものが実用化されている。ＬＥＤは、略点光源状に形成されているので、面光源装置として使用するためには、多数のＬＥＤを並べて、それらが発光する光を均一に出射させる必要がある。また、例えば、赤，緑，青の３色のＬＥＤを使用して色再現性を向上させる場合には、各色を均一に混色して出射させる必要がある。
例えば、特許文献１には、導光板の側面に凹部を形成し、この凹部内にＬＥＤを配置する例が開示されている。
しかし、特許文献１に記載の導光板では、凹部により光が広がるが、大型の面光源装置では、凹部の反対側まで光が十分に届かないという問題があった。
特開２００４−３２５９５９号公報 As a surface light source device for illuminating a liquid crystal display device or the like from the back, a device using a light emitting diode (LED) has been put into practical use. Since the LED is formed in a substantially point light source shape, in order to use it as a surface light source device, it is necessary to arrange a large number of LEDs and uniformly emit light emitted from them. Further, for example, when using three LEDs of red, green, and blue to improve color reproducibility, it is necessary to uniformly mix and emit each color.
For example, Patent Document 1 discloses an example in which a concave portion is formed on a side surface of a light guide plate and an LED is disposed in the concave portion.
However, in the light guide plate described in Patent Document 1, light spreads by the concave portion, but there is a problem that the large surface light source device cannot sufficiently reach the opposite side of the concave portion.
JP 2004-325959 A

本発明の課題は、複数の発光源からの光を混合して均一な状態で出射し、また、大型の面光源装置であっても位置によらず均一な輝度を得られる光混合部材、面光源装置を提供することである。   An object of the present invention is to mix a light from a plurality of light emitting sources and emit the light in a uniform state, and to obtain a uniform luminance regardless of the position even in a large surface light source device, a surface A light source device is provided.

本発明は、以下のような解決手段により、前記課題を解決する。なお、理解を容易にするために、本発明の実施例に対応する符号を付して説明するが、これに限定されるものではない。
請求項１の発明は、発光源（１０，１０Ｒ，１０Ｇ，１０Ｂ）の少なくとも一部が挿入された状態で配置可能な窪みであって、多数並べて配置された凹部（２１）と、前記凹部に対向する側に突出して多数並べられた凸部（２２）と、を備える光混合部材（２０）である。
請求項２の発明は、請求項１に記載の光混合部材において、前記凸部（２２）が並ぶ間隔は、前記凹部（２１）が並ぶ間隔よりも短いこと、を特徴とする光混合部材（２０）である。
請求項３の発明は、請求項１又は請求項２に記載の光混合部材において、前記凹部（２１）及び前記凸部（２２）を除く部分の少なくとも一部には、反射層（Ｒ１）が形成されていること、を特徴とする光混合部材（２０）である。
請求項４の発明は、請求項１から請求項３までのいずれか１項に記載の光混合部材において、前記凸部（２２）の頂点部（２３）には、反射層（Ｒ２）が形成されていること、を特徴とする光混合部材（２０）である。
請求項５の発明は、請求項１から請求項４までのいずれか１項に記載の光混合部材において、前記凹部（２１）の形状は、楕円筒又は楕円球の一部を含むこと、を特徴とする光混合部材（２０）である。
請求項６の発明は、請求項１から請求項５までのいずれか１項に記載の光混合部材において、前記凸部（２２）の形状は、楕円筒又は楕円球の一部を含むこと、を特徴とする光混合部材（２０）である。
請求項７の発明は、請求項１から請求項６までのいずれか１項に記載の光混合部材（２０）と、前記光混合部材の前記凹部（２１）内に少なくとも一部が挿入された状態で配置された発光源（１０）と、前記光混合部材の前記凸部（２２）に対向する位置に配置された導光板（３０）と、を備える面光源装置（１）である。
請求項８の発明は、請求項７に記載の面光源装置において、前記光混合部材（２０）は、使用状態における前記導光板（３０）の上部及び／又は下部に配置されていること、を特徴とする面光源装置（１）である。 The present invention solves the above problems by the following means. In addition, in order to make an understanding easy, although the code | symbol corresponding to the Example of this invention is attached | subjected and demonstrated, it is not limited to this.
The invention of claim 1 is a depression that can be arranged in a state in which at least a part of the light source (10, 10R, 10G, 10B) is inserted, and a plurality of depressions (21) arranged side by side, and the depressions A light mixing member (20) comprising a plurality of convex portions (22) that protrude to the opposite side and are lined up.
According to a second aspect of the present invention, in the light mixing member according to the first aspect, an interval in which the convex portions (22) are arranged is shorter than an interval in which the concave portions (21) are arranged. 20).
According to a third aspect of the present invention, in the light mixing member according to the first or second aspect, a reflective layer (R1) is formed on at least a part of the portion excluding the concave portion (21) and the convex portion (22). It is formed, It is a light mixing member (20) characterized by the above-mentioned.
According to a fourth aspect of the present invention, in the light mixing member according to any one of the first to third aspects, a reflective layer (R2) is formed at the apex (23) of the convex portion (22). The light mixing member (20) is characterized in that
According to a fifth aspect of the present invention, in the light mixing member according to any one of the first to fourth aspects, the shape of the recess (21) includes a part of an elliptic cylinder or an elliptic sphere. It is the light mixing member (20) characterized.
The invention of claim 6 is the light mixing member according to any one of claims 1 to 5, wherein the shape of the convex portion (22) includes a part of an elliptic cylinder or an elliptic sphere, The light mixing member (20) characterized by the following.
According to a seventh aspect of the present invention, at least a part of the light mixing member (20) according to any one of the first to sixth aspects and the concave portion (21) of the light mixing member is inserted. It is a surface light source device (1) provided with the light emission source (10) arrange | positioned in the state, and the light-guide plate (30) arrange | positioned in the position facing the said convex part (22) of the said light mixing member.
The invention according to claim 8 is the surface light source device according to claim 7, wherein the light mixing member (20) is disposed on an upper part and / or a lower part of the light guide plate (30) in a use state. The surface light source device (1) is characterized.

本発明によれば、以下の効果を奏することができる。
（１）発光源の少なくとも一部が挿入された状態で配置可能な窪みであって、多数並べて配置された凹部と、凹部に対向する側に突出して多数並べられた凸部とを備えるので、照明光を混合し、かつ、照明光を特定の出射角度範囲内で出射させることができる。 According to the present invention, the following effects can be obtained.
(1) Since it is a depression that can be arranged in a state where at least a part of the light emitting source is inserted, a plurality of depressions arranged side by side, and a plurality of projections arranged to protrude to the side facing the depression, The illumination light can be mixed and the illumination light can be emitted within a specific emission angle range.

（２）凸部が並ぶ間隔は、凹部が並ぶ間隔よりも短いので、照明光を均一に混色できる。 (2) Since the interval at which the convex portions are arranged is shorter than the interval at which the concave portions are arranged, it is possible to uniformly mix illumination light.

（３）凹部及び凸部を除く部分の少なくとも一部には、反射層が形成されているので、凹部で進行方向が広げられた照明光のうちで、不要な方向へ進む光を反射して戻し、凸部から出射させることができる。 (3) Since a reflective layer is formed on at least a part of the portion excluding the concave portion and the convex portion, the light traveling in an unnecessary direction is reflected out of the illumination light whose traveling direction is widened by the concave portion. It can return and it can radiate | emit from a convex part.

（４）凸部の頂点部には、反射層が形成されているので、凸部の内でレンズ効果の低い頂点部付近に到達する光を反射して戻し、再利用できる。 (4) Since the reflection layer is formed at the apex portion of the convex portion, the light reaching the apex portion having a low lens effect within the convex portion can be reflected back and reused.

（５）凹部の形状は、楕円筒又は楕円球の一部を含むので、光混合部材内で照明光を効率よく広げることができ、照明光を十分に混合させることができる。 (5) Since the shape of the recess includes an elliptic cylinder or a part of an elliptic sphere, the illumination light can be efficiently spread within the light mixing member, and the illumination light can be sufficiently mixed.

（６）凸部の形状は、楕円筒又は楕円球の一部を含むので、光混合部材から出射する照明光を収束させることができる。 (6) Since the shape of the convex portion includes an elliptic cylinder or a part of an elliptic sphere, the illumination light emitted from the light mixing member can be converged.

（７）光混合部材は、使用状態における導光板の上部及び／又は下部に配置されているので、混色と同時に、左右方向の集光を行える。 (7) Since the light mixing member is disposed in the upper part and / or the lower part of the light guide plate in the use state, the light mixing member can collect light in the left-right direction simultaneously with the color mixture.

複数の発光源からの光を混合して均一な状態で出射し、また、大型の面光源装置であっても位置によらず均一な輝度を得るという目的を、導光板とは別に、光混合部材を設け、この光混合部材に凹部と凸部とを設けることにより実現した。   Light mixing is performed separately from the light guide plate for the purpose of mixing light from multiple light sources and emitting them in a uniform state, and obtaining uniform brightness regardless of position even for large surface light source devices. This was realized by providing a member and providing the light mixing member with a concave portion and a convex portion.

図１は、本発明による面光源装置の実施例を示す斜視図である。図１は、使用状態と同様な配置で示しており、面光源装置の背面側斜め上方から見た状態を示している。
なお、図１を含め、以下に示す各図は、模式的に示した図であり、各部の大きさ、形状は、理解を容易にするために、適宜誇張して示している。
本実施例の面光源装置１は、ＬＥＤ１０，光混合部材２０，導光板３０を有している。
ＬＥＤ１０は、略点光源の発光ダイオードを用いた発光源であって、発光波長分布の異なる複数種類のＬＥＤを用いている。具体的には、主に赤色の波長の光を発光する赤色ＬＥＤ１０Ｒ，主に緑色の波長の光を発光する緑色ＬＥＤ１０Ｇ，主に青色の波長の光を発光する青色ＬＥＤ１０Ｂの３種類のＬＥＤが規則正しく一列に配列されている。その配列順序は、緑色ＬＥＤ１０Ｇ，青色ＬＥＤ１０Ｂ，赤色ＬＥＤ１０Ｒ，緑色ＬＥＤ１０Ｇ，緑色ＬＥＤ１０Ｇ，青色ＬＥＤ１０Ｂ，赤色ＬＥＤ１０Ｒ，緑色ＬＥＤ１０Ｇ・・・と並んでいる。なお、ＬＥＤ１０が並んでいる間隔は、２０ｍｍ間隔である。 FIG. 1 is a perspective view showing an embodiment of a surface light source device according to the present invention. FIG. 1 shows an arrangement similar to that in the use state, and shows a state viewed from obliquely upward on the back side of the surface light source device.
In addition, each figure shown below including FIG. 1 is the figure shown typically, and the magnitude | size and shape of each part are exaggerated suitably for easy understanding.
The surface light source device 1 of this embodiment includes an LED 10, a light mixing member 20, and a light guide plate 30.
The LED 10 is a light emission source using a light emitting diode that is a substantially point light source, and uses a plurality of types of LEDs having different emission wavelength distributions. Specifically, three types of LEDs are regularly formed: a red LED 10R that mainly emits light of a red wavelength, a green LED 10G that mainly emits light of a green wavelength, and a blue LED 10B that mainly emits light of a blue wavelength. Arranged in a row. The arrangement order is aligned with green LED 10G, blue LED 10B, red LED 10R, green LED 10G, green LED 10G, blue LED 10B, red LED 10R, green LED 10G,. In addition, the space | interval with which LED10 is located in a line is a 20 mm space | interval.

光混合部材２０は、導光板３０の下端に近接して配置されており、ＬＥＤ１０が発光する光を混色した後に導光板３０へ入射させる光学部材である。光混合部材２０の一端には、楕円筒形状に窪んだ凹部２１が多数並べて配置されており、この凹部２１内にＬＥＤ１０が１つずつ配置されている。また、光混合部材２０の凹部２１と対向する側の面には、突出した凸部２２が多数並べて配置されている。光混合部材２０は、凸部２２が設けられた側が導光板３０の下端部に対向するように配置されている。本実施例の光混合部材２０は、シクロポリオレフィン系の樹脂を素材としている。   The light mixing member 20 is disposed in the vicinity of the lower end of the light guide plate 30, and is an optical member that enters the light guide plate 30 after mixing the light emitted by the LEDs 10. At one end of the light mixing member 20, a large number of concave portions 21 recessed in an elliptical cylinder shape are arranged side by side, and the LEDs 10 are disposed one by one in the concave portion 21. In addition, a large number of protruding protrusions 22 are arranged side by side on the surface of the light mixing member 20 facing the recess 21. The light mixing member 20 is disposed so that the side on which the convex portion 22 is provided faces the lower end portion of the light guide plate 30. The light mixing member 20 of this embodiment is made of a cyclopolyolefin-based resin.

導光板３０は、光混合部材２０から出射される照明光を下端部から入射し、照明光を面光源光として表面３０ａから出射する略板状の部材である。
導光板３０の裏面３０ｂには、水平方向に延在する略三角柱形状のプリズム突起３１が垂直方向に多数並べて形成されている。本実施例の導光板３０は、透明なアクリルを素材としている。
照明光は、光混合部材２０が設けられた下端部から導光板３０に入射し、光混合部材２０に近い側から徐々にプリズム突起３１により表面３０ａ側（観察側）へ向けられることにより、全体としては、均一な面状の光として出射することができる。 The light guide plate 30 is a substantially plate-like member that receives illumination light emitted from the light mixing member 20 from the lower end portion and emits illumination light from the surface 30a as surface light source light.
On the back surface 30 b of the light guide plate 30, a large number of substantially triangular prism-shaped prism protrusions 31 extending in the horizontal direction are formed side by side in the vertical direction. The light guide plate 30 of this embodiment is made of transparent acrylic.
The illumination light enters the light guide plate 30 from the lower end where the light mixing member 20 is provided, and is gradually directed toward the surface 30a side (observation side) by the prism protrusion 31 from the side close to the light mixing member 20, thereby Can be emitted as uniform planar light.

図２は、光混合部材２０を拡大して示した斜視図である。図２（ａ）は、凸部２２側から見た図であり、図２（ｂ）は、凹部２１側から見た図である。
光混合部材２０の外周面には、反射層Ｒ１が形成されている。ただし、凸部２２が設けられた側と、凹部２１とには、反射層Ｒ１は、形成されていない。
また、凸部２２の頂点部２３は、平面となっており、この頂点部２３上には、反射層Ｒ２が形成されている。なお、図１及び図２では、反射層Ｒ１，Ｒ２が設けられている領域にハッチングを付している。
反射層Ｒ１，Ｒ２は、銀、アルミニウム、クロムのような高い反射率をもつ金属膜を蒸着したり、スパッタリング、ＣＶＤ（Chemical Vapor Deposition）などにより形成したり、あるいはメッキによって形成することができる。又は、市販の液晶導光板用の高反射率フィルム、例えば、株式会社ツジデン製高反射フィルムＲＦシリーズ、株式会社きもと製レフホワイト、住友スリーエム株式会社製（ビキュイティ）ＥＳＲ（Enhanced Specular Reflector）反射フィルム、三井化学株式会社製シルバーリフレクター、東レ株式社製Ｅ６０Ｖなどを適宜貼付してもよい。 FIG. 2 is an enlarged perspective view of the light mixing member 20. 2A is a diagram viewed from the convex portion 22 side, and FIG. 2B is a diagram viewed from the concave portion 21 side.
A reflection layer R <b> 1 is formed on the outer peripheral surface of the light mixing member 20. However, the reflective layer R <b> 1 is not formed on the side where the convex portion 22 is provided and the concave portion 21.
In addition, the vertex portion 23 of the convex portion 22 is a flat surface, and a reflective layer R <b> 2 is formed on the vertex portion 23. In FIGS. 1 and 2, the regions where the reflective layers R <b> 1 and R <b> 2 are provided are hatched.
The reflective layers R1 and R2 can be formed by vapor-depositing a metal film having a high reflectance such as silver, aluminum, or chromium, or by sputtering, CVD (Chemical Vapor Deposition), or by plating. Alternatively, a highly reflective film for a commercially available liquid crystal light guide plate, for example, a high reflective film RF series manufactured by Tsujiden Co., Ltd., Lef White manufactured by Kimoto Co., Ltd. (Vicuity) ESR (Enhanced Specular Reflector) reflective film manufactured by Sumitomo 3M Co., Ltd., A silver reflector manufactured by Mitsui Chemicals, E60V manufactured by Toray Industries, Inc., or the like may be appropriately attached.

図３は、光混合部材２０を図１中に示した矢印Ａ方向から見た図である。
凹部２１の形状は、長半径＝５ｍｍ，短半径＝３ｍｍの楕円筒形状の一部であり、深さ５ｍｍとなるように形成されている。なお、図３では、凹部２１の長半径と深さとを分けて示すために同じ５ｍｍの寸法となる部分を、敢えてずらして示している。また、凹部２１は、ピッチ２０ｍｍで並んでいる。
凸部２２の形状は、長半径＝０．３ｍｍ，短半径＝０．１ｍｍの楕円筒形状の一部であり、ピッチ０．１ｍｍで並んでいる。隣接する凸部２２の間には、幅０．０１ｍｍの微小突起部２４が形成されている。なお、この微小突起部２４は、半径０．００８ｍｍの円筒面となっている。凸部２２の頂点部２３は、幅０．０５ｍｍの平面となっている。
なお、光混合部材２０の高さ（図３の上下方向）は、３０ｍｍである。
このように、凸部２２が並ぶピッチを、凹部２１が並ぶピッチよりも短くすることにより、ＬＥＤ１０が発光する照明光を均一に混色できる。 FIG. 3 is a view of the light mixing member 20 as viewed from the direction of the arrow A shown in FIG.
The shape of the concave portion 21 is a part of an elliptic cylinder shape having a major radius = 5 mm and a minor radius = 3 mm, and is formed to have a depth of 5 mm. In FIG. 3, the same 5 mm dimension is intentionally shifted to indicate the major radius and depth of the recess 21 separately. Further, the recesses 21 are arranged at a pitch of 20 mm.
The shape of the convex portion 22 is a part of an elliptic cylinder shape having a major radius = 0.3 mm and a minor radius = 0.1 mm, and is arranged at a pitch of 0.1 mm. Between the adjacent convex parts 22, the micro projection part 24 of width 0.01mm is formed. The minute protrusion 24 has a cylindrical surface with a radius of 0.008 mm. The apex portion 23 of the convex portion 22 is a flat surface having a width of 0.05 mm.
The height of the light mixing member 20 (vertical direction in FIG. 3) is 30 mm.
Thus, the illumination light emitted from the LED 10 can be uniformly mixed by making the pitch of the convex portions 22 shorter than the pitch of the concave portions 21.

図４は、ＬＥＤ１０が発光する照明光の光混合部材２０内での進み方を説明する図である。
ＬＥＤ１０が発光した照明光は、凹部２１から光混合部材２０に入射すると、凹部２１を通過するときに進行する方向の範囲が広がり、様々な方向へ進む。したがって、緑色ＬＥＤ１０Ｇ，青色ＬＥＤ１０Ｂ，赤色ＬＥＤ１０Ｒそれぞれからの発光波長の異なる光が光混合部材２０内で略均一に混合される。
ただし、そのまま照明光が進行する方向が広がったままであると、導光板３０に入射できる照明光が少なくなり、また、導光板３０に入射したとしても、導光板３０光混合部材２０が設けられている下端部から遠い上端部まで光が十分に届かず、場所によっては十分な輝度を得られず、輝度ムラのある面光源装置となってしまう。 FIG. 4 is a diagram for explaining how the illumination light emitted from the LED 10 travels in the light mixing member 20.
When the illumination light emitted by the LED 10 enters the light mixing member 20 from the recess 21, the range of the direction of travel when passing through the recess 21 is widened and proceeds in various directions. Accordingly, light having different emission wavelengths from the green LED 10G, the blue LED 10B, and the red LED 10R are mixed substantially uniformly in the light mixing member 20.
However, if the direction in which the illumination light travels continues to spread, the illumination light that can enter the light guide plate 30 is reduced, and even if it enters the light guide plate 30, the light guide plate 30 light mixing member 20 is provided. Light does not sufficiently reach from the lower end to the far upper end, and sufficient luminance cannot be obtained in some places, resulting in a surface light source device having uneven luminance.

そこで、本実施例では、凸部２２から照明光を出射させることとして、この凸部２２によるレンズ効果（光偏向作用）により、光混合部材２０から出射する照明光を適度に収束させている。この適度に収束した照明光を導光板３０へ入射させることにより、導光板３０内の全ての位置に照明光を到達させることができる。
また、反射層Ｒ１によって、不要な方向へ進む照明光を反射して戻し、凸部２２から出射させることにより、光を有効に利用できる。
また、凸部２２の頂点部２３は、平面となっており、この頂点部２３上には、反射層Ｒ２を形成した。凸部２２の頂点を楕円筒のままとしても、その形状はレンズ効果が小さく、照明光を収束する効果が低い。そこで、本実施例では、頂点部２３に反射層Ｒ２を設け、収束されないような照明光を反射して戻し再利用している。なお、頂点部２３を平面としたのは、反射層Ｒ２の形成を容易に行うためである。このように、頂点部２３に反射層Ｒ２を形成したので、この部分に到達する光は、反射して戻して、他の部分に形成された反射層Ｒ１により反射させた後、凸部２２から出射させることにより、光の収束性を高めている。
なお、凸部２２の楕円筒形状、及び、頂点部２３の幅を適宜設定することにより、照明光が光混合部材２０から出射するときの収束状態（拡散状態）を変更できる。 Therefore, in this embodiment, the illumination light is emitted from the convex portion 22, and the illumination light emitted from the light mixing member 20 is appropriately converged by the lens effect (light deflection action) by the convex portion 22. By making the appropriately converged illumination light enter the light guide plate 30, the illumination light can reach all positions in the light guide plate 30.
Further, the illumination light that travels in an unnecessary direction is reflected back by the reflection layer R <b> 1 and returned from the convex portion 22, so that the light can be used effectively.
Further, the vertex portion 23 of the convex portion 22 is a flat surface, and the reflective layer R2 is formed on the vertex portion 23. Even if the vertex of the convex portion 22 remains an elliptic cylinder, the shape thereof has a small lens effect, and the effect of converging illumination light is low. Therefore, in this embodiment, the reflection layer R2 is provided at the apex portion 23, and the illumination light which is not converged is reflected and reused. The reason why the apex portion 23 is a flat surface is that the reflective layer R2 can be easily formed. As described above, since the reflection layer R2 is formed at the vertex 23, the light reaching this portion is reflected back and reflected by the reflection layer R1 formed at the other portion, and then from the convex portion 22. By making it emit, the light convergence is improved.
In addition, the convergence state (diffusion state) when illumination light radiate | emits from the light mixing member 20 can be changed by setting the elliptical cylindrical shape of the convex part 22, and the width | variety of the vertex part 23 suitably.

（変形例）
以上説明した実施例に限定されることなく、種々の変形や変更が可能であって、それらも本発明の均等の範囲内である。
（１）本実施例において、導光板３０の表面側（観察側）に、例えば、微細凹凸形状を有した光拡散シートやレンチキュラーレンズシート等の光学シートを適宜配置してもよい。 (Modification)
The present invention is not limited to the embodiments described above, and various modifications and changes are possible, and these are also within the equivalent scope of the present invention.
(1) In the present embodiment, for example, an optical sheet such as a light diffusing sheet or a lenticular lens sheet having a fine concavo-convex shape may be appropriately disposed on the surface side (observation side) of the light guide plate 30.

（２）本実施例において、ＬＥＤ１０は、赤色，緑色，青色の３色に分かれている例を示したが、これに限らず、例えば、４色以上の発光色に分けられていてもよいし、白色等、単色の発光を行うＬＥＤを１種類のみ設けていてもよい。 (2) In the present embodiment, the LED 10 is illustrated as being divided into three colors of red, green, and blue. However, the present invention is not limited thereto, and may be divided into, for example, four or more emission colors. Further, only one type of LED that emits light of a single color such as white may be provided.

（３）本実施例において、発光源にＬＥＤを用いる例を示したが、これに限らず、例えば、冷陰極管を用いてもよいし、ハロゲンランプ、高圧水銀灯、キセノンランプ、レーザ等、他の種類の発光源としてもよい。 (3) In this embodiment, an example in which an LED is used as a light source has been shown. However, the present invention is not limited to this. For example, a cold cathode tube may be used, a halogen lamp, a high-pressure mercury lamp, a xenon lamp, a laser, etc. It is good also as a kind of light emission source.

（４）本実施例において、ＬＥＤ１０及び光混合部材２０を導光板３０の下端側のみに配置した例を示したが、これに限らず、例えば、ＬＥＤ１０及び光混合部材２０を導光板３０の上端側にさらに配置してもよいし、導光板３０の４つの端部全てに配置してもよい。 (4) In the present embodiment, the example in which the LED 10 and the light mixing member 20 are disposed only on the lower end side of the light guide plate 30 has been described. It may be further arranged on the side, or may be arranged on all four ends of the light guide plate 30.

（５）本実施例において、導光板３０には、プリズム突起３１が垂直方向に多数並べて形成されている例を示したが、これに限らず、例えば、微小な溝を多数形成するなど、導光板に用いられている公知の技術を適宜使用してもよい。 (5) In the present embodiment, an example in which a large number of prism protrusions 31 are arranged in the vertical direction on the light guide plate 30 is shown. However, the present invention is not limited to this, and for example, a large number of minute grooves are formed. You may use suitably the well-known technique used for the optical plate.

（６）本実施例において、凹部２１及び凸部２２の形状は、楕円筒の一部形状を含む形状である例を示したが、これに限らず、例えば、楕円球の一部形状を含む形状であってもよいし、円筒面等、その他の曲面であってもよい。 (6) In the present embodiment, the shape of the concave portion 21 and the convex portion 22 is an example including a shape including a partial shape of an elliptic cylinder, but is not limited thereto, and includes, for example, a partial shape of an elliptic sphere. The shape may be sufficient, and other curved surfaces, such as a cylindrical surface, may be sufficient.

本発明による面光源装置の実施例を示す斜視図である。It is a perspective view which shows the Example of the surface light source device by this invention. 光混合部材２０を拡大して示した斜視図である。3 is an enlarged perspective view of the light mixing member 20. FIG. 光混合部材２０を図１中に示した矢印Ａ方向から見た図である。It is the figure which looked at the light mixing member 20 from the arrow A direction shown in FIG. ＬＥＤ１０が発光する照明光の光混合部材２０内での進み方を説明する図である。It is a figure explaining how to advance in the light mixing member 20 of the illumination light which LED10 light-emits.

符号の説明Explanation of symbols

１０ ＬＥＤ
１０Ｒ 赤色ＬＥＤ
１０Ｇ 緑色ＬＥＤ
１０Ｂ 青色ＬＥＤ
２０ 光混合部材
２１ 凹部
２２ 凸部
２３ 頂点部
２４ 微小突起部
Ｒ１，Ｒ２ 反射層
３０ 導光板
３０ａ 表面
３０ｂ 裏面
３１ プリズム突起

10 LED
10R Red LED
10G green LED
10B Blue LED
20 Light Mixing Member 21 Concave 22 Convex 23 Vertex 24 Micro Projection R1, R2 Reflective Layer 30 Light Guide Plate 30a Front Surface 30b Back Surface 31 Prism Projection

Claims (8)

発光源の少なくとも一部が挿入された状態で配置可能な窪みであって、多数並べて配置された凹部と、
前記凹部に対向する側に突出して多数並べられた凸部と、
を備える光混合部材。 A recess that can be arranged in a state where at least a part of the light emitting source is inserted, and a plurality of recesses arranged side by side;
A plurality of convex portions arranged in a protruding manner on the side facing the concave portion;
A light mixing member comprising: 請求項１に記載の光混合部材において、
前記凸部が並ぶ間隔は、前記凹部が並ぶ間隔よりも短いこと、
を特徴とする光混合部材。 The light mixing member according to claim 1,
An interval in which the convex portions are arranged is shorter than an interval in which the concave portions are arranged;
A light mixing member characterized by the above. 請求項１又は請求項２に記載の光混合部材において、
前記凹部及び前記凸部を除く部分の少なくとも一部には、反射層が形成されていること、
を特徴とする光混合部材。 In the light mixing member according to claim 1 or 2,
A reflective layer is formed on at least a part of the portion excluding the concave portion and the convex portion,
A light mixing member characterized by the above. 請求項１から請求項３までのいずれか１項に記載の光混合部材において、
前記凸部の頂点部には、反射層が形成されていること、
を特徴とする光混合部材。 In the light mixing member according to any one of claims 1 to 3,
A reflective layer is formed at the apex of the convex part,
A light mixing member characterized by the above. 請求項１から請求項４までのいずれか１項に記載の光混合部材において、
前記凹部の形状は、楕円筒又は楕円球の一部を含むこと、
を特徴とする光混合部材。 In the light mixing member according to any one of claims 1 to 4,
The shape of the recess includes an elliptic cylinder or a part of an elliptic sphere,
A light mixing member characterized by the above. 請求項１から請求項５までのいずれか１項に記載の光混合部材において、
前記凸部の形状は、楕円筒又は楕円球の一部を含むこと、
を特徴とする光混合部材。 In the light mixing member according to any one of claims 1 to 5,
The shape of the convex part includes a part of an elliptic cylinder or an elliptic sphere,
A light mixing member characterized by the above. 請求項１から請求項６までのいずれか１項に記載の光混合部材と、
前記光混合部材の前記凹部内に少なくとも一部が挿入された状態で配置された発光源と、
前記光混合部材の前記凸部に対向する位置に配置された導光板と、
を備える面光源装置。 The light mixing member according to any one of claims 1 to 6,
A light emitting source disposed in a state where at least a portion is inserted into the recess of the light mixing member;
A light guide plate disposed at a position facing the convex portion of the light mixing member;
A surface light source device comprising: 請求項７に記載の面光源装置において、
前記光混合部材は、使用状態における前記導光板の上部及び／又は下部に配置されていること、
を特徴とする面光源装置。
The surface light source device according to claim 7,
The light mixing member is disposed at an upper part and / or a lower part of the light guide plate in a use state;
A surface light source device.
JP2006045539A 2006-02-22 2006-02-22 Light mixing member, surface light source device Withdrawn JP2007227095A (en)

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