JP2005347214A - 面状光源装置およびこれを用いた表示装置 - Google Patents
面状光源装置およびこれを用いた表示装置 Download PDFInfo
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- JP2005347214A JP2005347214A JP2004168866A JP2004168866A JP2005347214A JP 2005347214 A JP2005347214 A JP 2005347214A JP 2004168866 A JP2004168866 A JP 2004168866A JP 2004168866 A JP2004168866 A JP 2004168866A JP 2005347214 A JP2005347214 A JP 2005347214A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0005—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being of the fibre type
- G02B6/001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being of the fibre type the light being emitted along at least a portion of the lateral surface of the fibre
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/002—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces
- G02B6/0021—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces for housing at least a part of the light source, e.g. by forming holes or recesses
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
- G02B6/0068—Arrangements of plural sources, e.g. multi-colour light sources
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
- G02B6/0073—Light emitting diode [LED]
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/2804—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers
- G02B6/2808—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers using a mixing element which evenly distributes an input signal over a number of outputs
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4219—Mechanical fixtures for holding or positioning the elements relative to each other in the couplings; Alignment methods for the elements, e.g. measuring or observing methods especially used therefor
- G02B6/4228—Passive alignment, i.e. without a detection of the degree of coupling or the position of the elements
- G02B6/423—Passive alignment, i.e. without a detection of the degree of coupling or the position of the elements using guiding surfaces for the alignment
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Planar Illumination Modules (AREA)
- Liquid Crystal (AREA)
Abstract
【解決手段】 上面に発光面21となる開口部を有する金属筐体内に、複数の導光棒1を互いに平行に配置し、この導光棒1の端面1aに空間を介して対向する点状光源(LED)2を配置した。このように導光棒1と点状光源2から構成される光源ユニット3を備えた面状光源装置20においては、導光棒1と金属筐体(第2のフレーム8)との間にリーク電流が発生しないため、導光棒1と第2のフレーム8との距離を小さくすることができる。また、光源ユニット3を構成する導光棒1は、従来の導光板に比べて体積が小さく軽量であり、光源として蛍光管を用いないことから、環境負荷物質である水銀を含有していない。
【選択図】図2
Description
図1は、本発明の実施の形態1における面状光源装置を示す平面図、図2は、図1中II−IIで示す部分の断面を示す水平断面図、図3は、図1中III−IIIで示す部分の断面を示す垂直断面図である。なお、図中、同一、相当部分には同一符号を付している。
また、金属筐体内の開口部(発光面)21には、光源ユニット3から出射された光および反射板6から反射された光を均一化する拡散板4が配置される。この拡散板4は、光散乱物質が混入されたアクリルやポリカーボネート等の樹脂板や表面を凹凸面化した樹脂板等からなる。さらに、拡散板4の上部には、光を所望の方向に出射するためのブリズムシートや拡散シート等の光学シート5を1枚から複数枚配置することができる。なお、この光学シート5は必ずしも配置しなくてもよい。
ここで、導光棒1から徐々に光が出射するため、各地点の伝播光強度はI1>I2>I3の関係が成り立つ。よって、各地点の光出射率がt1=t2=t3であれば、導光棒1からの出射光強度も点状光源2側の端面1a近傍で強く、端面1aから遠ざかるにつれ弱くなるように分布してしまう(O1>O2>O3)。しかし、本実施の形態においては光出射率がt1<t2<t3となるように出射面1cの粗度を調整しているため、各光源ユニット3から輝度ムラの少ない出射光を得ることができる。
図9は、本発明の実施の形態2における面状光源装置を示す平面図である。本実施の形態2における面状光源装置20は、図9に示すように、導光棒1の両側の端面1a、1bに点状光源2を配置し構成される複数の光源ユニット3を、垂直方向(図9中、矢印で示す方向)、すなわち開口部(発光面21)の略長方形の短辺と平行に配置したものである。なお、図中、実施の形態1と同一、相当部分には同一符号を付し説明を省略する。
図11(a)は本発明の実施の形態3における面状光源装置20を示す平面図、図11(b)は、図11(a)中II−IIで示す部分の断面を示す水平断面図である。なお、図中、実施の形態1および2と同一、相当部分には同一符号を付し説明を省略する。
本実施の形態4では、本発明による面状光源装置20に用いられる光源ユニット3を構成する様々な導光棒1の例について図13、図14および図15を用いて説明する。図13(a)〜(f)、図14(a)〜(c)および図15(a)〜(d)は、本発明の実施の形態4における面状光源装置20に用いられる導光棒1または光源ユニット3を示す斜視図または断面図である。なお、図中、実施の形態1〜3と同一、相当部分には同一符号を付し説明を省略する。また、図13、図14および図15中、上方は発光面21側、下方は反射板6側とする。
2、2r、2g、2b 点状光源、3 光源ユニット、4 拡散板、5 光学シート、
6 反射板、7 第1のフレーム、8 第2のフレーム、9 配線板、10 絶縁体、
11 放熱板、12 光源ユニット固定部、13 凹部、14 凸部、
18 反射シート、20、 面状光源装置、21 発光面、23 反射板ガイド、
30 従来の面状光源装置、31 線状光源(蛍光管)。
Claims (7)
- 上面に開口部を有する筐体と、前記筐体内に配置された複数の導光棒およびこの導光棒の二つの端面の少なくとも一方に対向して配置されこの端面に向けて光を出射する点状光源から構成される光源ユニットと、前記筐体内の前記光源ユニットより下方に配置され前記光源ユニットから出射された光を前記開口部側へ反射する反射板とを備えた面状光源装置であって、
前記光源ユニットを構成する前記導光棒の少なくとも一部に、前記点状光源からの距離に応じて光出射率を変化させる光出射手段を設けたことを特徴とする面状光源装置。 - 請求項1記載の面状光源装置であって、前記光出射手段として、前記導光棒の前記点状光源と対向するして配置した面を除く面を、前記点状光源からの距離に応じて粗度の変化する凹凸面としたことを特徴とする請求項1記載の面状光源装置。
- 上面に開口部を有する筐体と、前記筐体内に配置された複数の導光棒およびこの導光棒の二つの端面の少なくとも一方に対向して配置されこの端面に向けて光を出射する点状光源から構成される光源ユニットと、前記筐体内の前記光源ユニットより下方に配置され前記光源ユニットから出射された光を前記開口部側へ反射する反射板とを備えた面状光源装置であってにおいて、
前記光源ユニットを構成する前記導光棒は、その長手方向に垂直な断面の面積が変化することを特徴とする面状光源装置。 - 請求項1〜請求項3のいずれか一項に記載の面状光源装置であって、前記光源ユニットを構成する前記点状光源は、と前記導光棒の二つの端面の少なくとも一方に空間を介して対向するよう配置されているの間に空間を設けていることを特徴とする面状光源装置
- 請求項1〜請求項4のいずれか一項に記載の面状光源装置であって、前記光源ユニットを構成する前記点状光源として、発光色の異なる複数種類の発光ダイオードを用い、それらの発光ダイオードを1本の前記導光棒の前記端面に対向して配置したことを特徴とする面状光源装置。
- 請求項1〜請求項5のいずれか一項に記載の面状光源装置であって、前記筐体の前記開口部は略長方形であり、前記導光棒は、前記開口部の短辺と平行に配置されたことを特徴とする面状光源装置。
- 請求項1〜請求項6のいずれか一項に記載の面状光源装置の発光面上部に、面状光源から出射された光を変調して情報を表示する表示手段を配置したことを特徴とする表示装置。
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JP2004168866A JP4314157B2 (ja) | 2004-06-07 | 2004-06-07 | 面状光源装置およびこれを用いた表示装置 |
TW094115551A TW200604675A (en) | 2004-06-07 | 2005-05-13 | Planer light source device and display device using it |
US11/130,255 US7300184B2 (en) | 2004-06-07 | 2005-05-17 | Planar light source device and display device using the same |
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US7300184B2 (en) | 2007-11-27 |
TW200604675A (en) | 2006-02-01 |
TWI299422B (ja) | 2008-08-01 |
US20050270796A1 (en) | 2005-12-08 |
JP4314157B2 (ja) | 2009-08-12 |
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