JP4437024B2 - Flat lighting device - Google Patents

Flat lighting device Download PDF

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JP4437024B2
JP4437024B2 JP2003343696A JP2003343696A JP4437024B2 JP 4437024 B2 JP4437024 B2 JP 4437024B2 JP 2003343696 A JP2003343696 A JP 2003343696A JP 2003343696 A JP2003343696 A JP 2003343696A JP 4437024 B2 JP4437024 B2 JP 4437024B2
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light
linear light
light source
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illumination device
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忠幸 藤見
剛 大下
知之 渡辺
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日本ライツ株式会社
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Description

本発明は、第１の方向に延在する線状光源をこの第１の方向と交差する第２の方向に沿って所定間隔で配した平面照明装置に関する。   The present invention relates to a flat illumination device in which linear light sources extending in a first direction are arranged at a predetermined interval along a second direction intersecting with the first direction.

透過型液晶表示装置のバックライト光源などに用いられる平面照明装置は、比較的小面積に適合するものと比較的大面積に適合するものとが知られている。このうち、比較的小面積に適合するものは、特許文献１に記載されているように、光が内部を伝播する板状のライトガイドを用い、このライトガイドの側端面からライトガイド内に光源からの光を入射させ、最終的にライトガイドの表面から出射する光を光拡散シートや輝度上昇フィルムを通して光量分布の均一化および出射光の方向制御を行っている。これに対し、比較的大面積に適合するものは、特許文献２に記載されているように、光源を挟んで光反射シートの反対側に光拡散シートや輝度上昇フィルムを配し、光源から発せられた光を光反射シートによって光拡散シートや輝度上昇フィルム側にすべて導き、これら光拡散シートや輝度上昇フィルムを通過する出射光の光量分布の均一化およびその方向制御を行っている。   2. Description of the Related Art It is known that a flat illumination device used for a backlight light source of a transmissive liquid crystal display device is adapted to a relatively small area and adapted to a relatively large area. Among these, as described in Patent Document 1, a light guide that fits in a relatively small area uses a plate-like light guide through which light propagates, and a light source is inserted into the light guide from the side end face of the light guide. From the light guide, and finally the light emitted from the surface of the light guide is made uniform through the light diffusion sheet and the brightness enhancement film, and the light quantity distribution is made uniform and the direction of the emitted light is controlled. On the other hand, as described in Japanese Patent Application Laid-Open No. 2004-228561, a light source sheet and a brightness enhancement film are arranged on the opposite side of the light reflection sheet with the light source interposed therebetween as described in Patent Document 2. The emitted light is all guided to the light diffusion sheet and the brightness enhancement film side by the light reflection sheet, and the light quantity distribution of the outgoing light passing through the light diffusion sheet and the brightness enhancement film is made uniform and the direction thereof is controlled.

上述した光拡散シートは、指向性の強い光をほぼ完全拡散状態に散乱させるものであって光量分布の均一化に寄与し、輝度上昇フィルムは逆に散乱光に特定の指向性を与えるのに寄与する。これら２種類のシートを適宜併用することにより、出射光の光量分布の均一化および指向特性の調整が行われる。   The light diffusing sheet described above scatters highly directional light in a nearly completely diffusing state, contributing to uniform light quantity distribution, and the brightness enhancement film, on the contrary, gives specific directivity to scattered light. Contribute. By appropriately using these two types of sheets together, the light quantity distribution of the emitted light is made uniform and the directivity is adjusted.

特開平９−２９２５３１号公報Japanese Patent Laid-Open No. 9-292531 特許第３２６７７２５号公報Japanese Patent No. 3267725

特許文献１に記載された従来の平面照明装置では、導光板の側方に光源を配置する構造のため、平面照明装置自体の厚みを薄く設定することが可能である反面、光源の配置箇所が導光板の周囲に制限されてしまう関係から、特に表示面積の大きな大型の液晶表示装置のバックライト光源として利用することが難しく、高輝度の光を導光板の表面全域から均一に出射させることが困難となる場合があった。   In the conventional flat illumination device described in Patent Document 1, since the light source is arranged on the side of the light guide plate, the thickness of the flat illumination device itself can be set thin. Because it is limited to the periphery of the light guide plate, it is difficult to use as a backlight light source for large liquid crystal display devices with a particularly large display area, and high brightness light can be uniformly emitted from the entire surface of the light guide plate. It could be difficult.

特許文献２に記載された従来の平面照明装置の場合、光源の配置に関して導光板を使用した場合のような制約がないため、このような不具合を解消することができるものの、光源から平面照明装置の照明光の出射面までの光路長を長く設定することが困難である。このため、平面照明装置自体の厚みを薄くしようとすると輝度分布や光量分布にむらが生じやすく、これを回避するために光の損失が増大する欠点を持つ光拡散シートを複数枚使用したり、光源を必要以上に密に配置する必要があり、この場合にはコストや消費電力の点で問題が生ずる。   In the case of the conventional flat illumination device described in Patent Document 2, since there is no restriction as in the case of using a light guide plate with respect to the arrangement of the light source, such a problem can be solved, but the flat illumination device from the light source can be solved. It is difficult to set a long optical path length to the exit surface of the illumination light. For this reason, when trying to reduce the thickness of the flat illumination device itself, unevenness in the luminance distribution and light amount distribution is likely to occur, and in order to avoid this, a plurality of light diffusion sheets having the disadvantage of increasing the loss of light can be used, It is necessary to arrange the light sources more densely than necessary. In this case, problems arise in terms of cost and power consumption.

（発明の目的）
本発明の目的は、指向性の高い高輝度の照明光を出射させることができ、しかもこの出射光の光量分布を均一化させることができる小型軽量かつ低消費電力の平面照明装置を提供することにある。 (Object of invention)
An object of the present invention is to provide a small, light, and low power consumption flat illumination device capable of emitting high-intensity illuminating light with high directivity and making the light quantity distribution of the emitted light uniform. It is in.

本発明による平面照明装置は、第１の方向に延在し、この第１の方向と交差する第２の方向に沿って所定間隔で配された複数の線状光源と、これら複数の線状光源と隙間を隔てて対向するように配され、前記第１の方向に延在する頂部をそれぞれ有する複数のプリズムが前記第２の方向に沿って所定間隔で形成された少なくとも１枚の光偏向部材と、前記線状光源を挟んで前記光偏向部材の反対側に配され、前記線状光源からの光を前記光偏向部材側へ導く光反射部材と、この光反射部材と一体に形成されて当該光反射部材の一部を構成し、個々の前記線状光源を囲むように前記第２の方向に沿って所定間隔で前記線状光源側に突出すると共に前記第１の方向に延在し、前記第２の方向に垂直な面に対して傾斜した一対の傾斜面をそれぞれ有する複数の仕切り壁部と、前記光偏向部材と前記仕切り壁部との間に配されて先端が前記光偏向部材に当接し、基端部が前記仕切り壁部の一対の傾斜面を跨ぐ一対の傾斜面を有し、前記仕切り壁部と前記光偏向部材との間隔を一定に保持するための複数の支持ピンとを具えたことを特徴とするものである。 A flat illumination device according to the present invention includes a plurality of linear light sources that extend in a first direction and are arranged at predetermined intervals along a second direction that intersects the first direction, and the plurality of linear light sources. At least one light deflector arranged so as to be opposed to the light source with a gap and having a plurality of prisms each having a top extending in the first direction at a predetermined interval along the second direction A member, a light reflecting member disposed on the opposite side of the light deflecting member across the linear light source, and guiding light from the linear light source to the light deflecting member side, and formed integrally with the light reflecting member Forming a part of the light reflecting member and projecting toward the linear light source at predetermined intervals along the second direction so as to surround each linear light source and extending in the first direction. Each having a pair of inclined surfaces inclined with respect to a surface perpendicular to the second direction. Pair across a plurality of partition walls that, provided that the tip between said light deflecting member and the partition wall portion is brought into contact with the light deflection member, proximal end a pair of inclined surfaces of the partition wall portion And a plurality of support pins for maintaining a constant spacing between the partition wall portion and the light deflection member .

本発明においては、線状光源から発せられた光が直接または光反射部材を介して光偏向部材側へ導かれ、光偏向部材に対する入射位置および入射角に応じてプリズムの一対の斜面により主として２方向に分けられ、光偏向部材を通して線状光源を見た場合、実際に配された線状光源に対して２倍の数の線状光源が第２の方向に沿って密に配列して見えるような状態となる。仕切り壁部は、光偏向部材に対して大きく傾斜した光の入射を規制し、２つの仕切り壁部で囲まれた線状光源からの光は、主として光偏向部材との対向方向に導かれることとなる。   In the present invention, the light emitted from the linear light source is guided to the light deflection member side directly or through the light reflection member, and is mainly 2 by the pair of inclined surfaces of the prism according to the incident position and the incident angle with respect to the light deflection member. When the linear light sources are viewed through the light deflecting member, the number of the linear light sources is twice as large as the actual linear light sources arranged in the second direction. It will be in such a state. The partition wall portion restricts the incidence of light greatly inclined with respect to the light deflection member, and the light from the linear light source surrounded by the two partition wall portions is mainly guided in the direction facing the light deflection member. It becomes.

本発明による平面照明装置において、光偏向部材を挟んで線状光源の反対側に配される光拡散部材をさらに具えることができる。   The flat illumination device according to the present invention may further include a light diffusing member disposed on the opposite side of the linear light source with the light deflecting member interposed therebetween.

仕切り壁部の先端から突出する支持ピンが線状光源からの光に対して透過性を有することができる。
個々のプリズムの頂角が９０度〜１５０度の範囲にあってよい。 It can support pin projecting from the distal end of the partition wall portion permeable to light from the linear light source.
Apex angle of each prism is not good in a range of 90 degrees to 150 degrees.

線状光源と光偏向部材との間隔は、光偏向部材を通して線状光源を見た場合、２倍の数の線状光源が一定間隔で配列して見えるような間隔であることが好ましい。同様に、光偏向部材が２枚以上の場合、これら光偏向部材の間隔は、ｎ枚の光偏向部材を通して線状光源を見た時に２ｎ倍の数の線状光源が一定間隔で配列して見えるような間隔であることが好ましい。   The distance between the linear light source and the light deflection member is preferably such that when the linear light source is viewed through the light deflection member, twice the number of linear light sources appear to be arranged at a constant interval. Similarly, when there are two or more light deflecting members, the spacing between these light deflecting members is such that when the linear light sources are viewed through the n light deflecting members, 2n times as many linear light sources are arranged at regular intervals. It is preferable that the interval be visible.

本発明の平面照明装置によると、指向性の高い高輝度の照明光を光偏向部材から出射させることができると同時に、光偏向部材から出射する光の光量分布を均一化させることができる。この結果、平面照明装置に組み込まれる線状光源の数を減らして消費電力の削減および軽量化を達成し得る。また、２つの仕切り壁部で囲まれた線状光源からの光を一対の傾斜面によってより効率よく光偏向部材との対向方向に導くことができ、より指向性の高い高輝度の照明光を光偏向部材から出射させることが可能となる。さらに、複数の支持ピンによって仕切り壁部と光偏向部材との間隔を一定に保持することができる上、光偏向部材の剛性をそれほど考慮する必要がなくなり、平面照明装置の軽量化および薄肉化が可能となる。 According to the planar lighting device of the present invention, at the same time can be emitted illumination light having high directivity high intensity from the light deflecting member, it is possible to uniform the light intensity distribution of the light emitted from the light deflection member. As a result, the number of linear light sources incorporated in the flat illumination device can be reduced to reduce power consumption and weight. In addition, the light from the linear light source surrounded by the two partition walls can be more efficiently guided to the direction facing the light deflecting member by the pair of inclined surfaces, and more highly directional illumination light with higher directivity can be obtained. The light can be emitted from the light deflection member. Furthermore, the spacing between the partition wall portion and the light deflection member can be kept constant by a plurality of support pins, and it is not necessary to consider the rigidity of the light deflection member so much, thereby reducing the weight and thickness of the flat illumination device. It becomes possible.

光偏向部材を挟んで線状光源の反対側に配される光拡散部材をさらに具えた場合、光偏向部材を通って光拡散部材から出射する光の光量分布をより均一化させることができる。   In the case of further including a light diffusing member disposed on the opposite side of the linear light source with the light deflecting member interposed therebetween, the light quantity distribution of light emitted from the light diffusing member through the light deflecting member can be made more uniform.

支持ピンが線状光源からの光に対して透過性を有する場合、支持ピンを設けたことによる悪影響を回避することができる。 If supporting lifting pin permeable to light from the linear light source, it is possible to avoid an adverse effect due to the provision of the support pin.

個々のプリズムの頂角が９０度〜１５０度の範囲にある場合、光偏向部材を通して線状光源を見た時に２倍の数の線状光源が一定間隔で配列して見えるようにすることが容易であり、光偏向部材から出射する光の光量分布をより平均化させることができる。   When the apex angle of each prism is in the range of 90 degrees to 150 degrees, when the linear light sources are viewed through the light deflecting member, twice the number of linear light sources can be seen to be arranged at regular intervals. It is easy, and the light quantity distribution of the light emitted from the light deflection member can be further averaged.

光偏向部材を通して線状光源を見た場合、２倍の数の線状光源が一定間隔で配列して見えるように、線状光源と光偏向部材との間隔を設定した場合、光偏向部材から出射する光の光量分布をより平均化させることができる。   When the linear light source is viewed through the light deflecting member, when the interval between the linear light source and the light deflecting member is set so that twice as many linear light sources appear to be arranged at regular intervals, The light quantity distribution of the emitted light can be further averaged.

同様に、光偏向部材が２枚以上の場合、ｎ枚の光偏向部材を通して線状光源を見た時に２ｎ倍の数の線状光源が一定間隔で配列して見えるように、これら光偏向部材の間隔を設定することにより、光偏向部材から出射する光の光量分布をさらに平均化させることができる。   Similarly, when there are two or more light deflecting members, these light deflecting members are arranged such that 2n times as many linear light sources appear as being arranged at regular intervals when the linear light sources are viewed through the n light deflecting members. By setting this interval, the light quantity distribution of the light emitted from the light deflection member can be further averaged.

本発明による平面照明装置の実施形態について、図１〜図５を参照しながら詳細に説明するが、本発明はこれらの実施形態のみに限らず、これらをさらに組み合わせたり、この明細書の特許請求の範囲に記載された本発明の概念に包含されるあらゆる変更や修正が可能であり、従って本発明の精神に帰属する他の任意の技術にも当然応用することができる。   Embodiments of the flat illumination device according to the present invention will be described in detail with reference to FIGS. 1 to 5, but the present invention is not limited to these embodiments, and these may be further combined, or the claims of this specification may be claimed. Any change or modification included in the concept of the present invention described in the scope of the present invention can be made, and can naturally be applied to any other technique belonging to the spirit of the present invention.

第１の実施形態における平面照明装置の分解形状を図１に示し、その一部の断面構造を図２に拡大して示す。すなわち、本実施形態における平面照明装置は、第１の方向（図２中、紙面に対して垂直な方向）に延在し、この第１の方向と交差する第２の方向（図２中、左右方向）に沿って所定間隔、例えば１０〜５０mmの間隔で配された複数の直管タイプの冷陰極蛍光管（以下、ＣＣＦＬと記述する）１１と、光学的に透明な矩形の板状をなし、これら複数のＣＣＦＬ１１と隙間を隔てて対向するように配される光偏向部材１２と、この光偏向部材１２と同様に光学的に透明な矩形の板状をなし、光偏向部材１２を挟んでＣＣＦＬ１１の反対側に配される光拡散部材１３と、ＣＣＦＬ１１を挟んで光偏向部材１２の反対側に配され、ＣＣＦＬ１１からの光を光偏向部材１２側へ導く光反射部材１４と、これらＣＣＦＬ１１，光偏向部材１２，光拡散部材１３，光反射部材１４を収容するケーシング１５とで主要部が構成されている。   FIG. 1 shows an exploded shape of the flat illumination device according to the first embodiment, and FIG. 2 shows an enlarged partial sectional structure thereof. That is, the flat illumination device in the present embodiment extends in a first direction (a direction perpendicular to the paper surface in FIG. 2), and a second direction (in FIG. 2) intersects with the first direction. A plurality of straight tube type cold cathode fluorescent tubes (hereinafter referred to as CCFLs) 11 arranged at predetermined intervals along the left-right direction), for example, 10 to 50 mm, and an optically transparent rectangular plate shape. None, the light deflecting member 12 disposed so as to face the plurality of CCFLs 11 with a gap therebetween, and an optically transparent rectangular plate like the light deflecting member 12, sandwiching the light deflecting member 12 The light diffusing member 13 disposed on the opposite side of the CCFL 11, the light reflecting member 14 disposed on the opposite side of the light deflecting member 12 across the CCFL 11, and guiding the light from the CCFL 11 to the light deflecting member 12 side, and the CCFL 11 , Light deflection member 12, light diffusing section 13, the main portion in a casing 15 for accommodating the light reflecting member 14 is constructed.

板金などで形成されるケーシング１５は、光偏向部材１２，光拡散部材１３，光反射部材１４を囲み、光拡散部材１３の外周縁部が係止する内フランジ部１６ａを一方の開口端側に形成した枠部１６と、この枠部１６の他方の開口端側に嵌め込まれて光反射部材１４を受ける底板部１７とを有する。また、光反射部材１４と光偏向部材１２との間およびこの光偏向部材１２と光反射部材１４との間には、これらの間の間隔を規定するための枠状をなすスペーサ１８，１９がそれぞれ介装されている。ＣＣＦＬ１１からの光にさらされるケーシング１５内の露出箇所や、スペーサ１８，１９の内周面には、酸化チタンの如き白色顔料を含む塗料が塗布され、ＣＣＦＬ１１からの光を拡散反射して照明効率を向上させるように配慮している。   A casing 15 formed of sheet metal or the like surrounds the light deflecting member 12, the light diffusing member 13, and the light reflecting member 14, and an inner flange portion 16a to which the outer peripheral edge of the light diffusing member 13 is engaged is on one opening end side. The formed frame portion 16 and a bottom plate portion 17 that is fitted on the other opening end side of the frame portion 16 and receives the light reflecting member 14 are included. Further, between the light reflecting member 14 and the light deflecting member 12 and between the light deflecting member 12 and the light reflecting member 14, there are frame-like spacers 18 and 19 for defining an interval therebetween. Each is intervened. The exposed portion in the casing 15 exposed to light from the CCFL 11 and the inner peripheral surfaces of the spacers 18 and 19 are coated with a paint containing a white pigment such as titanium oxide, and the light from the CCFL 11 is diffused and reflected to improve illumination efficiency. Consideration to improve.

直径および長さがそれぞれ３mm，４４２mmの本実施形態における各ＣＣＦＬ１１は、ケーシング１５の枠部１６に取り付けられた図示しないコネクタを介して図示しない電源に接続され、ケーシング１５内において光反射部材１４に対し最も効率よく光が光偏向部材１２側に導かれるような位置関係に保持される。ＣＣＦＬ１１は、その長手方向（第１の方向）よりも径方向に光が広がるように出射する特性を有するため、視野角を大きく設定したい方向（つまり第２の方向）に沿ってＣＣＦＬ１１を所定間隔で配置することがより好ましいと言える。   Each CCFL 11 in the present embodiment having a diameter and a length of 3 mm and 442 mm is connected to a power source (not shown) via a connector (not shown) attached to the frame portion 16 of the casing 15, and is connected to the light reflecting member 14 in the casing 15. On the other hand, the positional relationship is such that light is guided to the light deflection member 12 side most efficiently. Since the CCFL 11 has a characteristic that light is emitted so as to spread in the radial direction rather than the longitudinal direction (first direction), the CCFL 11 is spaced at a predetermined interval along the direction in which the viewing angle is desired to be set large (that is, the second direction). It can be said that it is more preferable to arrange in the above.

屈折率が１.４〜１.７程度のアクリル樹脂（ＰＭＭＡ）やポリカーボネート（ＰＣ）などを成形してなる本実施形態における光偏向部材１２は、ＣＣＦＬ１１の反対側を向く面、つまり光拡散部材１３と対向する面に第１の方向に延在する頂部２０ａと一対の斜面２０ｂとをそれぞれ有する複数のプリズム２０が第２の方向に沿って所定間隔で形成されている。この光偏向部材１２を通してＣＣＦＬ１１を見た場合、２倍の数のＣＣＦＬ１１が一定間隔で配列して見えるように、ＣＣＦＬ１１と光偏向部材１２との間隔、つまり光偏向部材１２と光反射部材１４との間隔を規定するスペーサ１８の高さおよび個々のプリズム２０の頂角が設定されているが、プリズム２０の頂角は一般的に９０度〜１５０度の範囲内に設定することが好ましい。   The light deflection member 12 in the present embodiment formed by molding acrylic resin (PMMA) or polycarbonate (PC) having a refractive index of about 1.4 to 1.7 is a surface facing the opposite side of the CCFL 11, that is, a light diffusion member. A plurality of prisms 20 each having a top portion 20a extending in the first direction and a pair of inclined surfaces 20b on the surface facing 13 are formed at predetermined intervals along the second direction. When the CCFL 11 is viewed through the light deflecting member 12, the distance between the CCFL 11 and the light deflecting member 12, that is, the light deflecting member 12 and the light reflecting member 14, so that twice as many CCFLs 11 appear to be arranged at regular intervals. The height of the spacer 18 that defines the distance between the prisms 20 and the apex angles of the individual prisms 20 are set. In general, the apex angle of the prisms 20 is preferably set in the range of 90 to 150 degrees.

このように、光偏向部材１２を通してＣＣＦＬ１１を見た場合、ＣＣＦＬ１１があたかも２倍の数だけ配置されているように見えるため、光偏向部材１２がない場合よりも光量分布がより平均化されるものの、輝度分布を平均化させるまでには至らない。光偏向部材１２と同様に、透明なＰＭＭＡやＰＣなどで作られる光拡散部材１３は、その表面に微小な凹凸を形成したものであり、ここに入射する光をランダムな方向に拡散させることにより、上述した輝度分布を均一化させることができるようになっている。上述した微小な凹凸は、例えば半球状，円錐状，角錐状，円錐台状，角錐台状，円柱状，角柱状，円筒状，角筒状など、適宜採用することができる。   Thus, when the CCFL 11 is viewed through the light deflecting member 12, the CCFL 11 seems to be arranged twice as many, so that the light amount distribution is more averaged than when the light deflecting member 12 is not provided. It is not enough to average the luminance distribution. Similar to the light deflecting member 12, the light diffusing member 13 made of transparent PMMA, PC, or the like has minute irregularities formed on the surface thereof, and diffuses light incident thereon in a random direction. The luminance distribution described above can be made uniform. The minute irregularities described above can be appropriately adopted, for example, hemispherical, conical, pyramidal, truncated cone, truncated pyramid, cylindrical, prismatic, cylindrical, rectangular tube.

アルミニウムなどの金属薄板を曲げ成形してなる光反射部材１４は、第１および第２の方向に対して平行な底面部１４ａと、個々のＣＣＦＬ１１を囲むように第２の方向に沿ってＣＣＦＬ１１の配列間隔に対応した所定間隔でＣＣＦＬ１１側に突出すると共に第１の方向に延在する複数の仕切り壁部２１とを有する。個々の仕切り壁部２１は、第１の方向を含みかつ第２の方向に垂直な面に対して傾斜角が異なる２つの傾斜面２１ａ，２１ｂをそれぞれ有し、底面部１４ａを挟んで第２の方向に対称に形成されている。本実施形態における光反射部材１４の底面部１４ａから仕切り壁部２１の先端までの高さは５〜１５mm程度に設定される。この光反射部材１４の表面には、酸化チタンの如き白色顔料を含む塗料が塗布され、ＣＣＦＬ１１からの光を拡散反射するように意図されている。   The light reflecting member 14 formed by bending a thin metal plate such as aluminum has a bottom surface portion 14a parallel to the first and second directions and the CCFL 11 along the second direction so as to surround each CCFL 11. A plurality of partition walls 21 projecting toward the CCFL 11 at a predetermined interval corresponding to the arrangement interval and extending in the first direction. Each partition wall portion 21 includes two inclined surfaces 21a and 21b having different inclination angles with respect to a surface that includes the first direction and is perpendicular to the second direction, and the second wall 21a sandwiches the bottom surface portion 14a. It is formed symmetrically in the direction of. In the present embodiment, the height from the bottom surface portion 14a of the light reflecting member 14 to the tip of the partition wall portion 21 is set to about 5 to 15 mm. The surface of the light reflecting member 14 is coated with a paint containing a white pigment such as titanium oxide, and is intended to diffusely reflect light from the CCFL 11.

この光反射部材１４を樹脂の成形によって得ることも可能であり、この場合には成形樹脂中に酸化チタンの如き白色顔料を混入して光の反射効率を高めるようにしておくことが有効である。   It is also possible to obtain the light reflecting member 14 by molding a resin. In this case, it is effective to add a white pigment such as titanium oxide into the molding resin to increase the light reflection efficiency. .

仕切り壁部２１の先端と光偏向部材１２との間には、ＣＣＦＬ１１と剛性がそれほど高くない光偏向部材１２との間隔を一定に保つため、仕切り壁部２１の先端から突出して光偏向部材１２に当接する複数（図示例では５個）の支持ピン２２が相隔てて配設されている。本実施形態における支持ピン２２の外観を図３に示す。支持ピン２２は、仕切り壁部２１の先端の一対の傾斜面２１ａを跨ぐ一対の傾斜面２６を持った山形の台座部２２ａと、この台座部２２ａの中央から突出する円柱状の突出部２２ｂとを具え、この突出部２２ｂはＣＣＦＬ１１からの光に対して透過性を有するように、支持ピン２２を透明なＰＭＭＡやＰＣなどにて成形することが好ましい。あるいは、支持ピン２２の表面全体に適当な表面粗さを持つ梨地めっき処理を施し、支持ピン２２に光反射性を持たせるようにしてもよい。さらに、突出部２２ｂの下端部が大径の場合には、台座部２２ａを省略して突出部２２ｂの下端面に一対の傾斜面を形成して仕切り壁部２１の先端の一対の傾斜面２１ａを跨ぐように装着することも可能であり、この場合には透明なシリコーン樹脂などで突出部２２ｂ、つまり支持ピン２２を成形することができる。 Between the front end of the partition wall portion 21 and the light deflection member 12, the light deflection member 12 protrudes from the front end of the partition wall portion 21 in order to keep a constant distance between the CCFL 11 and the light deflection member 12 whose rigidity is not so high. A plurality of (five in the illustrated example) support pins 22 that are in contact with each other are disposed apart from each other. The external appearance of the support pin 22 in this embodiment is shown in FIG. The support pin 22 includes a mountain-shaped pedestal portion 22a having a pair of inclined surfaces 26 straddling a pair of inclined surfaces 21a at the tip of the partition wall portion 21, and a columnar protruding portion 22b protruding from the center of the pedestal portion 22a. It is preferable to form the support pin 22 with transparent PMMA, PC, or the like so that the protrusion 22b is transmissive to the light from the CCFL 11. Alternatively, the entire surface of the support pin 22 may be subjected to a satin plating process having an appropriate surface roughness so that the support pin 22 has light reflectivity. Further, when the lower end portion of the protruding portion 22b has a large diameter, the pedestal portion 22a is omitted and a pair of inclined surfaces are formed on the lower end surface of the protruding portion 22b to form a pair of inclined surfaces 21a at the tip of the partition wall portion 21. In this case, the protruding portion 22b, that is, the support pin 22 can be formed with a transparent silicone resin or the like.

ＣＣＦＬ１１から発せられた光は、直接、光偏向部材１２に入射するものと、光反射部材１４にて反射された後に光偏向部材１２に入射するものとがあるが、何れもプリズム２０によって回折された後、光拡散部材１３を通過し、照明光として利用される。この場合、仕切り壁部２１を有する光反射部材１４の存在によって、指向性の高い高輝度の照明光を光拡散部材１３から出射させることができ、しかも光拡散部材１３から出射する光の光量分布を均一化させることができるため、平面照明装置に組み込まれるＣＣＦＬ１１の数を減らして消費電力の削減と軽量化とを達成することができる。   The light emitted from the CCFL 11 is directly incident on the light deflecting member 12, and the light emitted from the CCFL 11 is reflected by the light reflecting member 14 and then incident on the light deflecting member 12, both of which are diffracted by the prism 20. After that, it passes through the light diffusing member 13 and is used as illumination light. In this case, due to the presence of the light reflecting member 14 having the partition wall portion 21, it is possible to emit illumination light with high directivity and high luminance from the light diffusing member 13, and the light quantity distribution of light emitted from the light diffusing member 13. Therefore, it is possible to reduce the number of CCFLs 11 incorporated in the flat illumination device, thereby reducing power consumption and weight.

上述した実施形態では、比較的剛性の高い光偏向部材１２を用いたが、光偏向部材１２がシート状をなしているような場合、光偏向部材１２の撓みを確実に防止するために補強用の支持部材を組み込む必要がある。   In the above-described embodiment, the light deflecting member 12 having a relatively high rigidity is used. However, when the light deflecting member 12 has a sheet shape, a reinforcing member is used to reliably prevent the light deflecting member 12 from being bent. It is necessary to incorporate a support member.

このような本発明による平面照明装置の他の実施形態の一例を分解状態で図４に示すと共にその支持ピン２２の部分の抽出拡大形状を図５に示すが、先の実施形態と同一機能の要素には、これと同一符号を記すに止め、重複する説明は省略するものとする。すなわち、本実施形態では、光学的に透明なＰＭＭＡやＰＣなどにて成形された平板状の支持部材２３を光偏向部材１２の直下に重ね合わせ、光反射部材１４の仕切り壁部２１の先端に装着された支持ピン２２の先端を支持部材２３に接触させている。このため、光偏向部材１２が可撓性を持ったシート状のものであっても、何ら問題なく使用することができる。また、本実施形態では、２枚の光拡散部材１３ａ，１３ｂを使用し、これらの間にスペーサ２４を介在させ、これによって一番上に位置する光拡散部材１３ａから出射する照明光の強度分布を先の実施形態よりもさらに均一化させることが可能となる。   An example of another embodiment of such a flat illumination device according to the present invention is shown in an exploded state in FIG. 4 and the extracted enlarged shape of the support pin 22 portion is shown in FIG. 5, which has the same function as the previous embodiment. The same reference numerals are used for the elements, and duplicate descriptions are omitted. That is, in the present embodiment, a flat plate-like support member 23 formed of optically transparent PMMA, PC, or the like is superposed directly below the light deflection member 12 and is placed at the tip of the partition wall portion 21 of the light reflection member 14. The tip of the mounted support pin 22 is brought into contact with the support member 23. For this reason, even if the light deflection member 12 is a flexible sheet, it can be used without any problem. In the present embodiment, two light diffusion members 13a and 13b are used, and a spacer 24 is interposed between them, whereby the intensity distribution of illumination light emitted from the light diffusion member 13a located on the top is provided. Can be made more uniform than in the previous embodiment.

光反射部材１４は、第１の方向に対して垂直に切った断面形状が半円弧状（理想的には放物面状）の反射面１４ｂを有し、その焦線位置近傍にＣＣＦＬ１１の中心を合致させ、ＣＣＦＬ１１から出射して光反射部材１４にて反射した光も可能な限り支持部材２３に対して垂直に入射するようにし、指向性の高い高輝度の照明光を光拡散部材１３ａから出射させるように配慮している。また、この光反射部材１４の仕切り壁部２１の上端には、幅の狭い平坦面１４ｃを形成しており、この平坦面１４ｃに形成された装着穴２５に支持ピン２２の台座部２２ａを嵌め込み、これらを一体化するようにしている。   The light reflecting member 14 has a reflecting surface 14b having a semicircular arc shape (ideally a parabolic shape) cut in a direction perpendicular to the first direction, and the center of the CCFL 11 is in the vicinity of the focal line position. And the light emitted from the CCFL 11 and reflected by the light reflecting member 14 is also made to enter the support member 23 as vertically as possible so that highly illuminating light with high directivity is emitted from the light diffusing member 13a. Consideration is made so that the light is emitted. Further, a narrow flat surface 14c is formed at the upper end of the partition wall portion 21 of the light reflecting member 14, and the pedestal portion 22a of the support pin 22 is fitted into the mounting hole 25 formed in the flat surface 14c. , These are integrated.

上述した２つの実施形態では、１枚の光偏向部材１２を設けることによって、ＣＣＦＬ１１からの光を２方向に分け、あたかも２倍の数のＣＣＦＬ１１が配されているようにすることによって、光量分布の均一化を図っているが、光偏向部材１２を２枚以上使用することにより、さらに光量分布の均一化を企図することができる。この場合、ｎ枚の光偏向部材１２を通してＣＣＦＬ１１を見た時、２ｎ倍の数のＣＣＦＬ１１が一定間隔で配列して見えるように、個々の光偏向部材１２の間隔や、これらに形成されたプリズム２０の頂角などを適切に設定することが好ましい。   In the two embodiments described above, by providing one light deflecting member 12, the light from the CCFL 11 is divided into two directions, and as if twice as many CCFLs 11 are arranged, the light quantity distribution. However, the use of two or more light deflecting members 12 can further attempt to make the light quantity distribution uniform. In this case, when the CCFLs 11 are viewed through the n light deflecting members 12, the intervals between the individual light deflecting members 12 and the prisms formed on them are arranged so that 2n times as many CCFLs 11 appear to be arranged at regular intervals. It is preferable to set an apex angle of 20 appropriately.

本発明による平面照明装置の一実施形態の外観を分解状態で表す立体投影図である。It is a three-dimensional projection figure showing the external appearance of one Embodiment of the planar illuminating device by this invention in a decomposition | disassembly state. 図１に示した平面照明装置の一部を抽出拡大した断面図である。It is sectional drawing which expanded and extracted a part of flat illumination apparatus shown in FIG. 図１に示した平面照明装置に組み込まれた支持ピンの部分の外観を表す立体投影図である。It is the three-dimensional projection figure showing the external appearance of the part of the support pin integrated in the planar illuminating device shown in FIG. 本発明による平面照明装置の他の実施形態の外観を分解状態で表す立体投影図である。It is the stereographic projection figure showing the external appearance of other embodiment of the planar illuminating device by this invention in a decomposition | disassembly state. 図４に示した平面照明装置の一部を抽出拡大した断面図である。It is sectional drawing which expanded and extracted a part of plane illuminating device shown in FIG.

符号の説明Explanation of symbols

１１ ＣＣＦＬ（冷陰極蛍光管）
１２ 光偏向部材
１３，１３ａ，１３ｂ 光拡散部材
１４ 光反射部材
１４ａ 底面部
１４ｂ 反射面
１４ｃ 平坦面
１５ ケーシング
１６ 枠部
１６ａ 内フランジ部
１７ 底板部
１８，１９ スペーサ
２０ プリズム
２０ａ 頂部
２０ｂ 斜面
２１ 仕切り壁部
２１ａ，２１ｂ 傾斜面
２２ 支持ピン
２２ａ 台座部
２２ｂ 突出部
２３ 支持部材
２４ スペーサ
２５ 装着穴
２６ 傾斜面 11 CCFL (Cold Cathode Fluorescent Tube)
DESCRIPTION OF SYMBOLS 12 Light deflection member 13, 13a, 13b Light diffusion member 14 Light reflection member 14a Bottom surface part 14b Reflective surface 14c Flat surface 15 Casing 16 Frame part 16a Inner flange part 17 Bottom plate part 18, 19 Spacer 20 Prism 20a Top part 20b Slope 21 Partition wall Part 21a, 21b Inclined surface 22 Support pin 22a Base part 22b Projection part 23 Support member 24 Spacer 25 Mounting hole
26 inclined surfaces

Claims (6)

第１の方向に延在し、この第１の方向と交差する第２の方向に沿って所定間隔で配された複数の線状光源(１１)と、
これら複数の線状光源(１１)と隙間を隔てて対向するように配され、前記第１の方向に延在する頂部(２０ａ)をそれぞれ有する複数のプリズム(２０)が前記第２の方向に沿って所定間隔で形成された少なくとも１枚の光偏向部材(１２)と、
前記線状光源(１１)を挟んで前記光偏向部材(１２)の反対側に配され、前記線状光源(１１)からの光を前記光偏向部材(１２)側へ導く光反射部材(１４)と、
この光反射部材(１４)と一体に形成されて当該光反射部材(１４)の一部を構成し、個々の前記線状光源(１１)を囲むように前記第２の方向に沿って所定間隔で前記線状光源(１１)側に突出すると共に前記第１の方向に延在し、前記第２の方向に垂直な面に対して傾斜した一対の傾斜面(２１ａ)をそれぞれ有する複数の仕切り壁部(２１)と、
前記光偏向部材(１２)と前記仕切り壁部(２１)との間に配されて先端が前記光偏向部材(１２)に当接し、基端部が前記仕切り壁部(２１)の一対の傾斜面(２１ａ)を跨ぐ一対の傾斜面（２６）を有し、前記仕切り壁部(２１)と前記光偏向部材(１２)との間隔を一定に保持するための複数の支持ピン(２２)と
を具えたことを特徴とする平面照明装置。 A plurality of linear light sources (11) extending in a first direction and arranged at a predetermined interval along a second direction intersecting the first direction;
A plurality of prisms (20), which are arranged so as to face the plurality of linear light sources (11) with a gap therebetween and respectively have apexes (20a) extending in the first direction, are arranged in the second direction. At least one light deflecting member (12) formed at a predetermined interval along;
A light reflecting member (14 ) arranged on the opposite side of the light deflection member (12) with the linear light source (11) in between, and guides light from the linear light source (11) to the light deflection member (12) side. ) And
The light reflecting member (14) is integrally formed to constitute a part of the light reflecting member (14) and to surround each linear light source (11) at a predetermined interval along the second direction. said first extend in a direction, a plurality of partition having a pair of inclined surfaces inclined to (21a), respectively with respect to a plane perpendicular to said second direction together with in projecting the linear light source (11) side A wall (21) ;
Disposed between the light deflecting member (12) and the partition wall portion (21), the distal end abuts on the light deflecting member (12), and the base end portion is a pair of slopes of the partition wall portion (21). A plurality of support pins (22) having a pair of inclined surfaces (26) straddling the surface (21a), and maintaining a constant distance between the partition wall portion (21) and the light deflection member (12); A flat illumination device characterized by comprising: 前記光偏向部材(１２)を挟んで前記線状光源(１１)の反対側に配される光拡散部材(１３，１３ａ，１３ｂ)をさらに具えたことを特徴とする請求項１に記載の平面照明装置。 The plane according to claim 1, further comprising a light diffusing member (13, 13a, 13b) disposed on the opposite side of the linear light source (11) with the light deflecting member (12) interposed therebetween. Lighting device. 前記支持ピン(２２)が前記線状光源(１１)からの光に対して透過性を有することを特徴とする請求項１または請求項２に記載の平面照明装置。 The flat illumination device according to claim 1 or 2 , wherein the support pin (22) is transmissive to light from the linear light source (11) . 個々の前記プリズム(２０)の頂角が９０度〜１５０度の範囲にあることを特徴とする請求項１から請求項３に記載の平面照明装置。 Planar lighting device according to claims 1 to 3 in which the apex angle of each of the prism (20) is being in the range of 90 degrees to 150 degrees. 前記線状光源(１１)と前記光偏向部材(１２)との間隔は、前記光偏向部材(１２)を通して前記線状光源(１１)を見た場合、２倍の数の前記線状光源(１１)が一定間隔で配列して見えるような間隔であることを特徴とする請求項１から請求項４の何れかに記載の平面照明装置。 The distance between the linear light source (11) and the light deflecting member (12) is double the number of the linear light sources ( when the linear light source (11) is viewed through the light deflecting member (12)). The flat illumination device according to any one of claims 1 to 4 , characterized in that 11) is an interval that appears to be arranged at a constant interval. 前記光偏向部材(１２)が２枚以上の場合、これら光偏向部材(１２)の間隔は、ｎ枚の前記光偏向部材(１２)を通して前記線状光源(１１)を見た時に２ｎ倍の数の前記線状光源(１１)が一定間隔で配列して見えるような間隔であることを特徴とする請求項１から請求項５の何れかに記載の平面照明装置。 If the light deflection member (12) is two or more, the interval of the optical deflector (12), through the light deflection member n sheets (12) of the 2n times when viewed the linear light source (11) The flat illumination device according to any one of claims 1 to 5 , wherein the number of the linear light sources (11) is such that the linear light sources (11) are arranged at regular intervals.
JP2003343696A 2003-10-01 2003-10-01 Flat lighting device Expired - Lifetime JP4437024B2 (en)

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KR100761631B1 (en) 2005-08-23 2007-09-27 오므론 가부시키가이샤 Backlight device and liquid crystal display device
JP5148061B2 (en) * 2005-08-24 2013-02-20 出光興産株式会社 Housing structure for lighting device, method for manufacturing the same, and backlight device using the structure
JP4545673B2 (en) * 2005-10-17 2010-09-15 株式会社クラレ LIGHTING DEVICE AND DISPLAY DEVICE USING THE SAME
JPWO2007055115A1 (en) * 2005-11-11 2009-04-30 日本ゼオン株式会社 Direct backlight unit
JP2008130315A (en) 2006-11-20 2008-06-05 Lintec Corp Luminescent sheet and method of producing the same
US7973489B2 (en) * 2007-11-02 2011-07-05 Tbt Asset Management International Limited Lighting system for illumination using cold cathode fluorescent lamps
TWI365332B (en) 2008-01-22 2012-06-01 Au Optronics Corp Backlight module unit and backlight module
WO2009110138A1 (en) * 2008-03-06 2009-09-11 シャープ株式会社 Lighting device and display device
JP2011034921A (en) * 2009-08-05 2011-02-17 Sekisui Plastics Co Ltd Light reflecting molded body and illumination body
KR101210648B1 (en) * 2011-01-14 2012-12-07 엘지이노텍 주식회사 backlight unit and display apparatus using the same
JP5989305B2 (en) 2011-01-14 2016-09-07 エルジー イノテック カンパニー リミテッド Backlight unit and display device using the same
KR101231728B1 (en) * 2011-01-14 2013-02-07 엘지이노텍 주식회사 backlight unit and display apparatus using the same
KR101210649B1 (en) * 2011-01-14 2012-12-07 엘지이노텍 주식회사 backlight unit and display apparatus using the same
JP2014063665A (en) * 2012-09-21 2014-04-10 Toshiba Lighting & Technology Corp Illumination apparatus

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