【０００１】[0001]
【産業上の利用分野】本発明は、点状や線状の光源を均
一な面光源に変換することによって、比較的広範囲を照
明するエッジライト型照明装置技術に関するものであ
り、液晶パネルや広告板など、背面から照明する方式の
表示装置類に役立つ。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an edge light type illuminating device technology for illuminating a relatively wide area by converting a point-like or linear light source into a uniform surface light source. It is useful for display devices such as boards that illuminate from the back.
【０００２】[0002]
【従来の技術】図２に示すように、アクリル樹脂板な
ど、光透過性が高い透明樹脂板２１の端面２６に管状の
光源灯２２を（反射板２３でおおい）装着し、一方の主
面２４にスクリーン印刷、ショットブラストなどの技法
によって微細網点状の乱反射層２７を設けると共に、光
源灯から透明樹脂板に入射ならびに伝播させた光を乱反
射層２７で反射して、他方の主面２５から出光させる方
式の面光源装置２０が、液晶表示装置などの照明に多用
されている。このように透明樹脂板の片面に乱反射層を
形成した従来型の面光源装置は、薄型化し易いことに利
点がある。2. Description of the Related Art As shown in FIG. 2, a tubular light source lamp 22 (covered by a reflector 23) is mounted on an end face 26 of a transparent resin plate 21 having a high light transmittance, such as an acrylic resin plate. 24, a fine halftone dot irregular reflection layer 27 is provided by a technique such as screen printing or shot blasting, and the light that has entered and propagated from the light source to the transparent resin plate is reflected by the irregular reflection layer 27 to form the other main surface 25. A surface light source device 20 that emits light from is widely used for illumination of a liquid crystal display device or the like. As described above, the conventional surface light source device in which the irregular reflection layer is formed on one side of the transparent resin plate has an advantage in that it can be easily made thin.
【０００３】また透明樹脂に、これとは屈折率が異なる
粒子を分散させると、散乱導光板になることが公知であ
り、図３に示すように、散乱子混入濃度などによって光
散乱能を変えた複数の散乱導光部３１ａ、３１ｂを用い
た導光板３１から成る散乱導光型の面光源装置３０も、
日本特許の平成６年３２４３３０号公開公報で提案され
ている。このように、光散乱能が異なる複数の散乱導光
領域を併用した面状光源装置では、導光板の出光面（主
面３５）全域に亘って光散乱能を調整できるので、出光
面積が比較的小さければ、輝度の均一性が保たれ易い。[0003] It is also known that dispersion of particles having a different refractive index from that of a transparent resin results in a scattering light guide plate. As shown in FIG. The scattered light guide type surface light source device 30 including the light guide plate 31 using the plurality of scattered light guide portions 31a and 31b,
This is proposed in Japanese Patent Publication No. 324330/1994. As described above, in the planar light source device using a plurality of scattering light guide regions having different light scattering capabilities, the light scattering capability can be adjusted over the entire light exit surface (main surface 35) of the light guide plate. If the target is small, the uniformity of the luminance is easily maintained.
【０００４】[0004]
【発明が解決しようとする課題】上記のような従来の面
光源装置は、出光面積が比較的小さい場合に適してお
り、出光面積が大きくなると、従来の技術は、そのまま
では次第に適用し難くなるのが通例である。透明樹脂板
の片面に網点状の乱反射層を設ける従来型の面光源装置
の方式では、出光面の全域に亘って輝度を均一に保つこ
とが困難になると同時に、光源灯から遠ざかるに連れて
輝度が下がる現象を補うため、導光距離と連動した乱反
射率の変調を要する。具体的な例としては、光源から遠
ざかるに従い、乱反射層を増やすことである。The above-mentioned conventional surface light source device is suitable for a case where the light emitting area is relatively small. If the light emitting area becomes large, the conventional technique becomes gradually difficult to apply as it is. It is customary. In the conventional surface light source device system in which a halftone dot irregular reflection layer is provided on one side of a transparent resin plate, it is difficult to keep the brightness uniform over the entire area of the light emitting surface, and at the same time, as the distance from the light source lamp increases. In order to compensate for the phenomenon of lowering the luminance, it is necessary to modulate the irregular reflectance in conjunction with the light guide distance. As a specific example, as the distance from the light source increases, the number of diffusely reflecting layers increases.
【０００５】一方、散乱導光型の面光源装置のうち光散
乱能が異なる複数の散乱導光領域を用いる方式におい
て、導光距離が増大しても出光面の輝度を均一に保つに
は、全ての散乱導光領域について光散乱能を低減させつ
つ、各散乱導光領域の光散乱能に微妙な差異を設ける必
要があるが、これを工業的に実現することは容易ではな
い。非常に散乱能の低いものを安定して作ることも困難
である。また、導光方式の如何によらず、導光板の出光
面において、光源灯の近傍に輝線状の輝度斑が生じるこ
とにも課題がある。従来はこれを解決する好適な方法が
なく、別部品により輝度調節を行っている。本発明の目
的は、出光面積が大きい場合にも比較的簡単な構成で出
光輝度とその均整度を高めると共に、光源灯近傍の輝度
斑を著しく低減させた導光板を創出することによって、
従来の技術に拘る諸課題を総合的に解決できる面光源装
置を提供することにある。On the other hand, in a system using a plurality of scattered light guide regions having different light scattering capabilities among the scattered light guide type surface light source devices, in order to keep the luminance of the light emitting surface uniform even if the light guide distance increases. It is necessary to reduce the light scattering ability of all the scattered light guide areas and to make a slight difference in the light scattering ability of each scattered light guide area, but it is not easy to realize this industrially. It is also difficult to stably produce very low scattering power. In addition, regardless of the light guide method, there is also a problem that a bright line-shaped luminance unevenness occurs near the light source lamp on the light exit surface of the light guide plate. Conventionally, there is no suitable method to solve this, and the brightness is adjusted by a separate component. The object of the present invention is to increase the light emission luminance and its uniformity with a relatively simple configuration even when the light emission area is large, and to create a light guide plate with significantly reduced luminance unevenness near the light source lamp.
An object of the present invention is to provide a surface light source device capable of comprehensively solving various problems related to the conventional technology.
【０００６】[0006]
【課題を解決する手段】この発明は、図１に示すとお
り、少なくとも一つの非散乱導光領域１１ａと、これと
同じ材料に屈折率が異なる粒子を分散した、少なくとも
一つの散乱導光領域１１ｂとが、重なる部分を有する導
光板（板状体）１１において、端面１６に光源灯１２を
装着すると共に（光源灯１２の背面を反射板１３でおお
い）、両領域の板厚で粒子の濃度を局所的に調節するこ
とによって、主面１５からの出射量の分布状態を制御し
たことを特徴とする面光源装置１０に係り、これにより
上記課題を解決するものである。According to the present invention, as shown in FIG. 1, at least one non-scattering light guiding region 11a and at least one scattering light guiding region 11b in which particles having different refractive indices are dispersed in the same material. In the light guide plate (plate-like body) 11 having an overlapping portion, the light source lamp 12 is mounted on the end face 16 (the back surface of the light source lamp 12 is covered with the reflection plate 13), and the particle concentration is determined by the thickness of both regions. The surface light source device 10 is characterized in that the distribution of the amount of light emitted from the main surface 15 is controlled by locally adjusting.
【０００７】[0007]
【作用】本発明の面状光源装置１０において、基本的に
は導光板の端面１６から入射した光はその屈折率が空気
よりも大きい為、スネルの法則に従い前記導光板の中を
全反射しながら進行するが、粒子に入射した光のみそこ
で散乱されて出射光が広がる。この散乱現象を繰り返
し、導光した光が導光板と空気の界面に対した時の光の
角度が臨界角より小さいもののみ出射される。この粒子
の数量や粒径等により出射光の強度及びその分布も変化
する。従ってこれらの設計が照明品質に大きく影響する
ことになる。これについて従来技術と比較しながら詳述
する。In the planar light source device 10 of the present invention, basically, the light incident from the end face 16 of the light guide plate has a larger refractive index than air, so that the light is totally reflected in the light guide plate according to Snell's law. However, only the light incident on the particles is scattered there and the emitted light spreads. This scattering phenomenon is repeated, and only light having a light angle smaller than the critical angle when the guided light reaches the interface between the light guide plate and air is emitted. The intensity of the emitted light and its distribution also change depending on the number and size of the particles. Therefore, these designs have a great influence on the lighting quality. This will be described in detail in comparison with the prior art.
【０００８】一般に照明などに用いられる面状光源装置
には明るく、均一に光ることが要求される。本発明の照
明装置の様に導光板の端面に光を入射し導光させ平面状
照明装置を構成するいわゆるエッジライト型照明装置に
おいて、導光板内に包含する粒子の体積分率を高くする
ことにより光出射量を多くする事が出来るが、過剰に体
積分率を高くすると光源に近い部分での出光が促進され
ると共に、光源から離れるに従って明るさが急激に低下
し、出光面内の輝度斑が大きなものになる。前記特開平
6-324330号公報の従来技術では、導光素子を構成するす
べてのブロック領域に散乱能を与えるため、導光板の面
積が大きくなる、つまり光源からの距離が離れるに従っ
て、散乱能の勾配を大きく出来ず、均一な光を得ること
が困難になってくるか、均一な光を得るが全体の輝度値
が低下する。また、光源近傍に散乱能を持つ領域が僅か
でもあると、出光面の入光面近傍に線状の輝度斑が発生
する。In general, a planar light source device used for lighting or the like is required to emit light uniformly and brightly. In a so-called edge light type illuminating device that constitutes a planar illuminating device in which light is incident on an end face of a light guiding plate and guided as in the lighting device of the present invention, the volume fraction of particles contained in the light guiding plate is increased. However, if the volume fraction is excessively high, light emission near the light source is promoted, and brightness decreases rapidly as the distance from the light source increases. Spots become large. The above-mentioned Japanese patent
In the prior art of 6-324330, in order to impart scattering power to all the block regions constituting the light guide element, the area of the light guide plate increases, that is, as the distance from the light source increases, the gradient of the scattering power increases. It is not possible to obtain uniform light, or uniform light is obtained, but the overall luminance value decreases. Also, if there is only a small area having scattering power near the light source, a linear luminance unevenness occurs near the light incident surface of the light emitting surface.
【０００９】この対策として、各ブロック領域の散乱能
の勾配差を大きくするため、ブロック領域の少なくとも
1つに粒子を包含しない非散乱導光領域を備えれば導光
板の面積が増大しても明るく均一な輝度分布を有する面
状光源が得られる。更に、光源近傍の出射量は非散乱導
光領域と散乱導光領域の板厚で粒子の濃度を局所的に調
節することによって制御できるので、光源付近の輝度斑
も解消できる。また、非散乱導光領域を用いることによ
って成形上の簡素化、及びコスト的なメリットが図れ
る。また、基板の一方の面に、スクリーン印刷、ショッ
トブラスト等による微細網点状等の乱反射層を形成し、
この基板の側方より光を入射させ、面状光源装置とする
従来技術では、基板の一方面からしか光が出射しない、
狙った網点の設計寸法に対し製造誤差が生じた場合この
誤差の二乗で全反射部に対する乱反射部の面積比が変化
してしまうため輝度斑のバラツキが大きくなってしまう
などの欠点がある。これに対し本発明の構成による照明
装置では、導光体の板厚方向の断面における粒子の体積
分率が同じならば、散乱能を持たせた部分が導光体内部
にどのような状態で入っていても光の出射量に変化はな
いので、簡単な構成で且つ導光板の両面から均一な明る
さの光が出射する照明装置が得られる。[0009] As a countermeasure, in order to increase the difference in the scattering power of each block area, at least the block area must be provided.
If one is provided with a non-scattering light-guiding region that does not contain particles, a planar light source having a bright and uniform luminance distribution can be obtained even if the area of the light guide plate increases. Furthermore, since the emission amount near the light source can be controlled by locally adjusting the particle concentration by the plate thickness of the non-scattered light guide region and the scattered light guide region, luminance unevenness near the light source can be eliminated. In addition, by using the non-scattering light guide region, simplification in molding and cost advantages can be achieved. Also, on one surface of the substrate, screen printing, forming irregular reflection layers such as fine halftone dots by shot blasting,
In the related art in which light is incident from the side of the substrate and the planar light source device is used, light is emitted only from one surface of the substrate.
If a manufacturing error occurs with respect to the design size of the target halftone dot, the square of this error changes the area ratio of the irregular reflection portion to the total reflection portion, and thus has a disadvantage that the unevenness of the luminance becomes large. On the other hand, in the lighting device according to the configuration of the present invention, if the volume fraction of the particles in the cross section in the plate thickness direction of the light guide is the same, in what state the portion having the scattering power is inside the light guide. Since there is no change in the amount of emitted light even when the light enters, an illuminating device having a simple configuration and emitting light of uniform brightness from both sides of the light guide plate can be obtained.
【００１０】（実施例１）図４は本発明の一実施例を説
明する図である。粒子無添加のMMA（メチルメタクリレ
ート）にラジカル重合開始剤としてベンゾイルパーオキ
サイド（BPO）を0.50wt%、連鎖移動剤としてn-ラウリル
メルカプタン（n-LM）を0.40wt%加え、70℃で24時間注
型重合させて、縦389mm、横286mmで厚さが中心方向に向
かって9mm（最薄部）から1mm（最厚部）迄連続的に変化
する凹状の導光体ブロックを得た。これを導光体ブロッ
ク４１ａとした。その後、MMAに平均粒径4.5μmのシリ
コーン系樹脂粉体（東芝シリコーン（株）製、トスパー
ル145）を0.20wt%加えて均一に分散した試料にラジカル
重合開始剤としてBPOを0.50wt%、連鎖移動剤としてn-LM
を0.40wt%加えて作製したシラップを導光体ブロック４
１ａの凹状部分に流し込み、70℃で24時間注型重合させ
て（４１ｂ）1枚の板状導光板４１を作製した。(Embodiment 1) FIG. 4 is a view for explaining an embodiment of the present invention. 0.50 wt% of benzoyl peroxide (BPO) as a radical polymerization initiator and 0.40 wt% of n-laurylmercaptan (n-LM) as a chain transfer agent are added to MMA (methyl methacrylate) without particles, and the mixture is added at 70 ° C. for 24 hours. By casting polymerization, a concave light guide block having a length of 389 mm and a width of 286 mm and a thickness continuously changing from 9 mm (the thinnest portion) to 1 mm (the thickest portion) in the center direction was obtained. This was used as a light guide block 41a. Then, 0.20 wt% of a silicone resin powder (Tospearl 145, manufactured by Toshiba Silicone Co., Ltd.) having an average particle size of 4.5 μm was added to MMA, and 0.50 wt% of BPO as a radical polymerization initiator was added to a uniformly dispersed sample. N-LM as transfer agent
Of syrup prepared by adding 0.40 wt% of
It was poured into the concave portion of 1a and cast-polymerized at 70 ° C. for 24 hours (41b) to produce one plate-shaped light guide plate 41.
【００１１】導光板の端面４６に、中心輝度28600cd/m2
の棒状光源（冷陰極性の蛍光ランプ）４２を装着し、導
光板の入射端面に対向しない部分を光反射膜（反射板４
３）で覆って、光の利用効率の向上を図った。導光板の
裏面４４に、空気層４８ｂを介して、プラスチックフィ
ルム上に白色微粒子から成る顔料層を形成した拡散反射
性の光反射層４９を装着すると同時に、導光板の表面４
５に、空気層４８ａを介して、光偏向層４７を装着し、
面光源装置４０を作製した。この面光源装置の出光面に
おける輝度をミノルタ（株）製CA-1000型輝度計で測定
した。画像解析装置で垂直出射光の輝度分布を評価した
ところ、図７に示すように、光散乱導光体全面にわたっ
て約7800cd/m2、明暗比約85%という非常に高輝度、高均
整度の面光源装置が得られた。また、導光方向の輝度に
急峻な変化がなく、従来使用されている導光体を用いた
場合に見られる入光面近傍の輝度斑も解消された。A center luminance of 28600 cd / m2 is applied to the end surface 46 of the light guide plate.
Is mounted, and a portion of the light guide plate that does not face the incident end face is reflected by a light reflection film (reflection plate 4).
3) to improve the light use efficiency. A light-reflecting light-reflective layer 49 having a pigment layer made of white fine particles formed on a plastic film is mounted on the back surface 44 of the light guide plate via an air layer 48b.
5, the light deflection layer 47 is attached via the air layer 48a,
The surface light source device 40 was manufactured. The luminance at the light emitting surface of this surface light source device was measured with a CA-1000 luminance meter manufactured by Minolta Co., Ltd. When the luminance distribution of the vertically emitted light was evaluated by an image analyzer, as shown in FIG. 7, it was found that the light scattering guide had a very high luminance and high uniformity of about 7800 cd / m2 and a light-dark ratio of about 85% over the entire surface. A surface light source device was obtained. In addition, there was no sharp change in the luminance in the light guide direction, and luminance unevenness near the light incident surface, which was observed when a conventionally used light guide was used, was also eliminated.
【００１２】（実施例２）図５は本発明の他の一実施例
を説明する図である。重量式フィーダーを用いて、ポリ
メタクリル酸メチルのペレット100重量部と、平均粒径
4.5μmのシリコーン系樹脂粉体（東芝シリコーン（株）
製、トスパール145）0.60重量部とを、二軸押出機（ス
クリュー仕様：L/D=32、直径44mm）に供給し、240℃に
加熱したシリンダ中で混練後、ペレット化した後、射出
成形機に供給し、シリンダ温度240℃、金型80℃、型締
圧450ｔの条件で成形し、縦389mm、横286mmで厚さが中
心方向に向かって0.5mm（最薄部）から3.5mm（最厚部）
迄変化する凸状の導光体ブロック５１ｂを作製した。そ
の後、前記凸状の導光体ブロックを縦389mm、横286mm、
厚さ9mmの金型に入れ、粒子無添加のポリメタクリル酸
メチルのペレットを溶融したもの（５１ａ）を流し込
み、1枚の平板状の導光板５１を作製した。実施例1と同
様の輝度測定結果を図8に示す。光散乱導光体全面にわ
たって約8500cd/m2、明暗比約90%という非常に高輝度、
高均整度の面光源装置５０が得られた。また、導光方向
の輝度に急峻な変化がなく、従来使用されている導光体
を用いた場合に見られる入光面近傍の輝度斑も解消され
た。(Embodiment 2) FIG. 5 is a view for explaining another embodiment of the present invention. Using a gravimetric feeder, 100 parts by weight of polymethyl methacrylate pellets and an average particle size
4.5μm silicone resin powder (Toshiba Silicone Co., Ltd.)
(Tospearl 145) 0.60 parts by weight to a twin screw extruder (screw specification: L / D = 32, diameter 44mm), kneaded in a cylinder heated to 240 ° C, pelletized, and then injection molded It is supplied to the machine and molded under the conditions of a cylinder temperature of 240 ° C, a mold of 80 ° C, and a clamping pressure of 450t. The thickness is 389mm long, 286mm wide and 0.5mm (thinest part) to 3.5mm toward the center (the thinnest part). Thickest part)
A light guide block 51b having a convex shape that changes up to the maximum was manufactured. Thereafter, the convex light guide block is 389 mm long, 286 mm wide,
In a mold having a thickness of 9 mm, a melt of pellet-free polymethyl methacrylate pellets (51a) was poured, and one flat light guide plate 51 was produced. FIG. 8 shows the same luminance measurement results as in Example 1. Extremely high brightness of about 8500 cd / m2 and light / dark ratio of about 90% over the entire surface of the light scattering guide,
The surface light source device 50 with high uniformity was obtained. In addition, there was no sharp change in the luminance in the light guide direction, and luminance unevenness near the light incident surface, which was observed when a conventionally used light guide was used, was also eliminated.
【００１３】（実施例３）図６は本発明のまた他の一実
施例を説明する図である。重量式フィーダーを用いて、
ポリメタクリル酸メチルのペレット100重量部と、平均
粒径4.5μmのシリコーン系樹脂粉体（東芝シリコーン
（株）製、トスパール145）０．２０重量部とを、二軸
押出機（スクリュー仕様：L/D=32、直径44mm）に供給
し、240℃に加熱したシリンダ中で混練後、ペレット化
した後、射出成形機に供給し、シリンダ温度240℃、金
型80℃、型締圧450t条件で成形し、縦400mm、横300mmで
厚さが短辺方向に沿って1mm（最薄部）から5mm（最厚
部）迄リニアに変化する楔形状の導光体ブロック６１ｂ
を作製した。粒子無添加のポリメタクリル酸メチルのペ
レットを使用し、同様のプロセスによって、縦400mm、
横300mmで厚さが短辺方向に沿って1mm（最薄部）から5m
m（最厚部）迄リニアに変化する楔形状の導光体ブロッ
ク６１ａを作製した。これら相補的形状を有する2個の
楔形状導光体ブロック６１ａ, ６１ｂの斜面同士を固定
して板状の光散乱導光板６１とした。導光板の端面６６
に、中心輝度30000cd/m2の棒状光源（冷陰極性の蛍光ラ
ンプ）６２を装着し、導光板の入射端面に対向しない部
分を光反射膜（反射板６３）で覆って、光の利用効率の
向上を図った。導光板の表裏両面に、空気層を介して、
拡散性を持ったフィルム６７を装着し、面光源装置６０
を作製した。〈実施例1〉と同様の測定を行ったとこ
ろ、光散乱導光体全面にわたって約500cd/m2、明暗比約
90%という極めて均一性の高い、両面から出射可能な面
状光源装置が得られた。(Embodiment 3) FIG. 6 is a view for explaining another embodiment of the present invention. Using a weight feeder,
100 parts by weight of polymethyl methacrylate pellets and 0.20 part by weight of a silicone resin powder having an average particle diameter of 4.5 μm (Tospearl 145, manufactured by Toshiba Silicone Co., Ltd.) were mixed in a twin-screw extruder (screw specification: L / D = 32, diameter 44mm), kneaded in a cylinder heated to 240 ° C, pelletized, then fed to an injection molding machine, cylinder temperature 240 ° C, mold 80 ° C, mold clamping pressure 450t Wedge-shaped light guide block 61b which is 400mm long and 300mm wide and whose thickness varies linearly from 1mm (thinest part) to 5mm (thickest part) along the short side direction
Was prepared. Using pellets of poly (methyl methacrylate) without particles, 400 mm long,
5mm from 300mm in width and 1mm (thinest part) along the short side direction
A wedge-shaped light guide block 61a that changes linearly up to m (the thickest portion) was produced. The two wedge-shaped light guide blocks 61a and 61b having the complementary shapes are fixed to each other to form a plate-shaped light scattering light guide plate 61. Light guide plate end face 66
A rod-shaped light source (cold cathode fluorescent lamp) 62 with a central luminance of 30000 cd / m2 is mounted on the light guide plate. Was improved. On both sides of the light guide plate, through the air layer,
A diffused film 67 is attached, and the surface light source device 60 is mounted.
Was prepared. When the same measurement was performed as in <Example 1>, it was found that the light-scattering light guide had a light-dark ratio of about 500 cd / m2 over the entire surface.
A highly uniform surface light source device capable of emitting light from both sides was obtained at 90%.
【００１４】[0014]
【発明の効果】本発明の面光源装置によって、出光面積
が大きい場合にも比較的簡単な構成で出光輝度とその均
整度が高められると共に、光源灯近傍付近の輝線状の輝
度斑を著しく低減させることが出来る。また、本発明は
使用する散乱導光領域と非散乱導光領域の材料や形状の
選択の幅が広く、複数組み合わせることも可能なので、
量産性、経済性にも優れた面光源装置が実現されること
になる。According to the surface light source device of the present invention, even when the light emission area is large, the light emission luminance and its uniformity can be increased with a relatively simple configuration, and the bright line-like luminance unevenness near the light source lamp is significantly reduced. Can be done. In addition, the present invention has a wide range of selection of materials and shapes of the scattered light guide region and the non-scattered light guide region to be used, and it is possible to combine a plurality of them.
A surface light source device which is excellent in mass productivity and economic efficiency is realized.
【図１】本発明の対象とする面光源装置の構成を模式的
に示した断面図。FIG. 1 is a cross-sectional view schematically showing a configuration of a surface light source device to which the present invention is applied.
【図２】従来技術の対象とする面光源装置の断面図の
例。FIG. 2 is an example of a cross-sectional view of a surface light source device to which the prior art is applied.
【図３】従来技術の対象とする面光源装置の断面図の
例。FIG. 3 is an example of a cross-sectional view of a surface light source device to which the related art is applied.
【図４】実施例１の対象とする面光源装置斜視図。FIG. 4 is a perspective view of a surface light source device to which the first embodiment is applied.
【図５】実施例２の対象とする面光源装置斜視図。FIG. 5 is a perspective view of a surface light source device to which the second embodiment is applied.
【図６】実施例３の対象とする面光源装置斜視図。FIG. 6 is a perspective view of a surface light source device according to a third embodiment.
【図７】実施例１の導光体出光面での入光面からの距離
と輝度の関係を示す。FIG. 7 shows the relationship between the distance from the light incident surface on the light exit surface of the light guide and the luminance in Example 1.
【図８】実施例２の導光体出光面での入光面からの距離
と輝度の関係を示す。FIG. 8 shows the relationship between the distance from the light entrance surface and the luminance on the light exit surface of the light guide according to the second embodiment.
10,20,30,40,50,60 面光源装置 11,21,31,41,51,61 導光板 12,22,42,62 光源灯 13,23,43,63 反射板 24,44 裏面（主面） 15,25,35,45 出光面（主面） 16,26,46,66 入光面（端面） 47,67 光偏光層 27 微細網点状の乱反射層 48a,48b 空気層 49 光反射層 11a,31a,41a,51a,61a 非散乱導光領域（透明樹脂板） 11b,31b,41b,51b,61b 散乱導光領域 10,20,30,40,50,60 Surface light source device 11,21,31,41,51,61 Light guide plate 12,22,42,62 Light source lamp 13,23,43,63 Reflector plate 24,44 Back surface ( Main surface) 15,25,35,45 Light outgoing surface (main surface) 16,26,46,66 Light incoming surface (end surface) 47,67 Light polarizing layer 27 Fine halftone dot irregular reflection layer 48a, 48b Air layer 49 Light Reflective layer 11a, 31a, 41a, 51a, 61a Non-scattered light guide area (transparent resin plate) 11b, 31b, 41b, 51b, 61b Scattered light guide area
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15183398AJP4127897B2 (en) | 1998-06-02 | 1998-06-02 | Surface light source device |
| TW88120391ATW502129B (en) | 1998-06-02 | 1999-11-23 | Planar lighting device and light guides used therein and method of making light guides |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15183398AJP4127897B2 (en) | 1998-06-02 | 1998-06-02 | Surface light source device |
| Publication Number | Publication Date |
|---|---|
| JPH11345512Atrue JPH11345512A (en) | 1999-12-14 |
| JP4127897B2 JP4127897B2 (en) | 2008-07-30 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15183398AExpired - Fee RelatedJP4127897B2 (en) | 1998-06-02 | 1998-06-02 | Surface light source device |
| Country | Link |
|---|---|
| JP (1) | JP4127897B2 (en) |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7258457B2 (en) | 2003-11-28 | 2007-08-21 | Canon Kabushiki Kaisha | Illumination optical system and image-taking apparatus |
| JP2009117357A (en)* | 2007-10-19 | 2009-05-28 | Fujifilm Corp | Light guide plate |
| JP2010257938A (en)* | 2009-03-31 | 2010-11-11 | Fujifilm Corp | Light guide plate |
| JP2012190753A (en)* | 2011-03-14 | 2012-10-04 | Fujifilm Corp | Light guide plate, and surface illumination device |
| WO2013012564A3 (en)* | 2011-07-20 | 2013-03-07 | Rambus Inc. | Coextruded optical sheet |
| WO2020257022A1 (en)* | 2019-06-19 | 2020-12-24 | Corning Incorporated | Transparent light guide plate and lighting device including same |
| US11539091B2 (en) | 2019-12-16 | 2022-12-27 | Industrial Technology Research Institute | Battery module |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5425026B2 (en) | 2010-09-08 | 2014-02-26 | 富士フイルム株式会社 | Light guide plate, planar illumination device, and liquid crystal display device |
| JP4851631B1 (en) | 2010-10-12 | 2012-01-11 | 富士フイルム株式会社 | Light guide plate and planar illumination device |
| JP5670794B2 (en) | 2011-03-28 | 2015-02-18 | 富士フイルム株式会社 | Surface lighting device |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7258457B2 (en) | 2003-11-28 | 2007-08-21 | Canon Kabushiki Kaisha | Illumination optical system and image-taking apparatus |
| JP2009117357A (en)* | 2007-10-19 | 2009-05-28 | Fujifilm Corp | Light guide plate |
| JP2010257938A (en)* | 2009-03-31 | 2010-11-11 | Fujifilm Corp | Light guide plate |
| JP2012190753A (en)* | 2011-03-14 | 2012-10-04 | Fujifilm Corp | Light guide plate, and surface illumination device |
| WO2013012564A3 (en)* | 2011-07-20 | 2013-03-07 | Rambus Inc. | Coextruded optical sheet |
| WO2020257022A1 (en)* | 2019-06-19 | 2020-12-24 | Corning Incorporated | Transparent light guide plate and lighting device including same |
| CN114080552A (en)* | 2019-06-19 | 2022-02-22 | 康宁股份有限公司 | Transparent light guide plate and lighting apparatus including the same |
| US11539091B2 (en) | 2019-12-16 | 2022-12-27 | Industrial Technology Research Institute | Battery module |
| Publication number | Publication date |
|---|---|
| JP4127897B2 (en) | 2008-07-30 |
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