JP2000182418A - Lighting system with light diffusion plate - Google Patents
Lighting system with light diffusion plateInfo
- Publication number
- JP2000182418A JP2000182418A JP10357322A JP35732298A JP2000182418A JP 2000182418 A JP2000182418 A JP 2000182418A JP 10357322 A JP10357322 A JP 10357322A JP 35732298 A JP35732298 A JP 35732298A JP 2000182418 A JP2000182418 A JP 2000182418A
- Authority
- JP
- Japan
- Prior art keywords
- light
- light source
- lighting device
- diffusion plate
- transmitted
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Light Guides In General And Applications Therefor (AREA)
- Optical Elements Other Than Lenses (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は光拡散板を備えた照
明装置に関する。The present invention relates to a lighting device provided with a light diffusing plate.
【０００２】[0002]
【従来の技術】従来から、照明用カバー、ディスプレー
看板用スクリーン等に用いられる光拡散板として、図８
（Ａ）に示すように、無機材料または有機材料からなる
拡散剤が透明プラスティックス基材に分散されたもの
や、同図（Ｂ）に示すように、透明プラスティックス基
材表面が一定のパターンで乱されたものが知られてい
る。また、上記の２つを組み合わせ、一定のパターンで
表面が乱された基材に拡散剤が分散されたものも知られ
ている。2. Description of the Related Art Conventionally, as a light diffusing plate used for a lighting cover, a display signboard screen, etc., FIG.
As shown in (A), a diffusing agent composed of an inorganic material or an organic material is dispersed in a transparent plastic substrate, or as shown in FIG. Known to be disturbed by. Further, a combination of the above two, in which a diffusing agent is dispersed in a substrate whose surface is disturbed in a certain pattern, is also known.
【０００３】ここで、透明プラスティックスとしては、
透明性および耐候性の観点から、一般に、メタクリル樹
脂またはスチレン樹脂が用いられている。また、拡散剤
としては、基材の透明プラスティックスと異なる屈折率
を有する硫酸バリウム、炭酸カルシウム、石英などの平
均粒径が１０ミクロン以下の微粒子が用いられることが
多い。このような微粒子をバインダーを介して表面に塗
布することにより、図８（Ｂ）に示すような透明プラス
ティックス基材表面が乱された拡散部材を製造すること
もある（特開昭５４−１５５２４１号公報等を参照）。
拡散剤としては有機材料も用いられ、例えば、特開平１
−２６９９０２号公報には、メチルメタクリレート樹脂
に有機架橋ポリマーとシロキサン結合を持つシリコーン
樹脂とが配合された光拡散板が記載されている。同公報
には、有機架橋ポリマーとシリコーン樹脂とを併用する
ことによって、基材と架橋ポリマーとの親和性を高め、
分散性が良好になることにより光拡散板としての光学特
性が良好になることが示されている。Here, transparent plastics include:
From the viewpoint of transparency and weather resistance, methacrylic resins or styrene resins are generally used. Further, as the diffusing agent, fine particles having an average particle diameter of 10 μm or less, such as barium sulfate, calcium carbonate, and quartz, having a refractive index different from that of the transparent plastic of the base material are often used. By applying such fine particles to the surface via a binder, a diffusion member in which the surface of the transparent plastic substrate is disturbed as shown in FIG. 8B may be manufactured (Japanese Patent Application Laid-Open No. 54-155241). Reference).
An organic material is also used as a diffusing agent.
JP-A-269902 discloses a light diffusion plate in which an organic crosslinked polymer and a silicone resin having a siloxane bond are blended in a methyl methacrylate resin. The publication discloses that by using an organic cross-linked polymer and a silicone resin together, the affinity between the substrate and the cross-linked polymer is increased,
It is shown that the better the dispersibility, the better the optical characteristics as a light diffusion plate.
【０００４】[0004]
【発明が解決しようとする課題】従来の拡散剤を用いる
光拡散板では、拡散剤による光の吸収・反射があるため
に高発光量を稼ぎつつ透けを十分に防止することができ
ず、消費電力の低下による省エネルギーの効果が十分に
は得られない。また、薄型看板の用途でドット印刷され
たシートと拡散剤を用いた光拡散板とを併用する場合に
は、明るさの点において十分であるとは言えない。In a conventional light diffusing plate using a diffusing agent, since the light is absorbed and reflected by the diffusing agent, it is not possible to sufficiently prevent the see-through while obtaining a high light emission amount, and to consume the light. The effect of energy saving due to the decrease in power cannot be obtained sufficiently. When a dot-printed sheet and a light diffusing plate using a diffusing agent are used in combination for a thin signboard, the brightness is not sufficient.
【０００５】本発明は上記の課題に鑑みてなされたもの
で、高い光線透過率を有し、かつ高い拡散特性を有する
光拡散板を備えた照明装置を提供することを目的とす
る。The present invention has been made in view of the above problems, and has as its object to provide an illuminating device provided with a light diffusion plate having high light transmittance and high diffusion characteristics.
【０００６】[0006]
【課題を解決するための手段】上記の課題を解決する本
発明の照明装置は、透過光を屈折または回折させる凹凸
構造が少なくとも一つの主面に形成された光拡散板と光
源とを備えたことを特徴とする。ここに、主面とは、板
状あるいはシート状である光拡散板の各面のうち、面積
の大きな２つの面をいう。上記光拡散板には、拡散剤が
含有されていても良い。According to a first aspect of the present invention, there is provided a lighting apparatus including a light diffusing plate having at least one main surface having an uneven structure for refracting or diffracting transmitted light, and a light source. It is characterized by the following. Here, the main surface refers to two surfaces having a large area among the surfaces of the plate-shaped or sheet-shaped light diffusion plate. The light diffusing plate may contain a diffusing agent.
【０００７】[0007]
【発明の実施の形態】本発明の照明装置の概略斜視図を
図１に示す。図１に示す光拡散板１は板状あるいはシー
ト状であって、その２つの主面のうち少なくとも一つの
面に光拡散板を透過する光を屈折または回折させる凹凸
構造２が形成されている。光拡散板１に近接して光源３
が配置される。凹凸構造２で光を屈折または回折させる
ことによって、透け防止と高透過率とを両立させること
ができる。FIG. 1 is a schematic perspective view of a lighting device according to the present invention. The light diffusion plate 1 shown in FIG. 1 has a plate shape or a sheet shape, and at least one of two main surfaces thereof has an uneven structure 2 for refracting or diffracting light transmitted through the light diffusion plate. . Light source 3 close to light diffusion plate 1
Is arranged. By refracting or diffracting the light by the concave-convex structure 2, it is possible to achieve both the prevention of see-through and the high transmittance.
【０００８】上記凹凸構造としては、レンチキュラーレ
ンズ状、プリズム状あるいは回折格子状のものが用いら
れ、光源の形態、照明装置の使用態様などに応じて凹凸
構造の形態を適宜選択すれば良い。また、上記凹凸構造
は２つの主面にそれぞれ設けても良く、一方の主面のみ
に設けても良い。２つの主面に設けられる凹凸構造の組
み合わせは任意である。例えば、レンチキュラーレンズ
状の凹凸構造を２つの主面にそれぞれ設けることによ
り、左右方向のみならず上下方向にも均一な拡散特性を
得ることができ、高輝度で光源の透けが防止された照明
装置を得ることができる。光源側にレンチキュラーレン
ズ状の凹凸構造を設け、観視者側に不等辺三角形のプル
ズム状の凹凸構造を配置することにより、任意の方向に
集中的に光を集めることができる。この組み合わせを用
いると、例えば店舗用の看板照明において、上方向に光
をほとんど出さず、下方向に集中的に光を集めることが
できる。なお、上記凹凸構造としては、マイクロレンズ
状のもの、蝿の目レンズ状のもの等でも良い。The rugged structure has a lenticular lens shape, a prism shape or a diffraction grating shape, and the shape of the rugged structure may be appropriately selected according to the form of the light source, the usage of the lighting device, and the like. The uneven structure may be provided on each of two main surfaces, or may be provided on only one of the main surfaces. The combination of the concavo-convex structures provided on the two main surfaces is arbitrary. For example, by providing a lenticular lens-like concave-convex structure on each of two main surfaces, a uniform diffusion characteristic can be obtained not only in the left-right direction but also in the up-down direction. Can be obtained. By providing a lenticular lens-shaped uneven structure on the light source side and arranging a scalene triangular pursum-shaped uneven structure on the viewer side, light can be concentrated in an arbitrary direction. When this combination is used, for example, in a signboard illumination for a store, almost no light is emitted in the upward direction, and light can be concentrated in the downward direction. The concave-convex structure may be a micro-lens-shaped one, a fly-eye-shaped one, or the like.
【０００９】レンチキュラーレンズ状の凹凸構造２を設
け、図２に示すようにレンチキュラーレンズ状の凹凸構
造の長手方向と、線状である光源３の長手方向とが平行
であるように光源と光拡散板１とを配置することによ
り、光源の長手方向に対して垂直な方向の光拡散特性を
改良することができ、透けが防止された明るい照明装置
を得ることができる。図２に示すように光拡散板と光源
とを配置すると、任意の単位レンチキュラーレンズに入
射した光源からの光は光源の短辺方向に屈折を受けない
が、長手方向には屈折を受け、光源からの光は観察者側
に曲げられる。これによって、観察者から見て視野角が
改善される。レンチキュラーレンズに平行な方向の視野
角θHおよび垂直な方向の視野角θVと輝度Ｇとの関係
は、一般に図３に示すようになる。A lenticular lens-shaped uneven structure 2 is provided. As shown in FIG. 2, the light source and the light diffuser are arranged such that the longitudinal direction of the lenticular lens-shaped uneven structure is parallel to the longitudinal direction of the linear light source 3. By disposing the plate 1, the light diffusion characteristics in the direction perpendicular to the longitudinal direction of the light source can be improved, and a bright illuminating device in which the see-through is prevented can be obtained. When the light diffusion plate and the light source are arranged as shown in FIG. 2, light from the light source incident on an arbitrary unit lenticular lens is not refracted in the short side direction of the light source, but is refracted in the longitudinal direction, and The light from is bent toward the observer. This improves the viewing angle as seen by the observer. The relationship between the viewing angle θ H in the direction parallel to the lenticular lens and the viewing angle θ V in the direction perpendicular to the lenticular lens and the luminance G is generally as shown in FIG.
【００１０】プリズム状の凹凸構造２を設け、図４に示
すようにプリズム状の凹凸構造の長手方向と、線状であ
る光源３の長手方向とが平行であるように光源と光拡散
板１とを配置することにより、光源の長手方向に対して
垂直な方向の視野角特性を改良することができ、透けが
防止された明るい照明装置を得ることができる。なお、
プリズムの断面形状としては、二等辺三角形，不等辺三
角形等が挙げられる。また、正面方向により多くの光を
集めるため、三角形の角度、ピッチまたは高さを連続的
に変化させても良い。A prismatic uneven structure 2 is provided, and the light source and the light diffusing plate 1 are arranged such that the longitudinal direction of the prismatic uneven structure is parallel to the longitudinal direction of the linear light source 3 as shown in FIG. By disposing (1) and (2), the viewing angle characteristics in the direction perpendicular to the longitudinal direction of the light source can be improved, and a bright lighting device in which the see-through is prevented can be obtained. In addition,
Examples of the cross-sectional shape of the prism include an isosceles triangle and an inequilateral triangle. Further, in order to collect more light in the front direction, the angle, pitch, or height of the triangle may be continuously changed.
【００１１】回折格子状の凹凸構造を設け、図５に示す
ように線状である光源の長手方向に対して垂直な方向に
回折光が発生するように光拡散板と光源とを配置するこ
とにより、光源の長手方向に対して垂直な方向の拡散特
性を改良することができ、透けが防止された明るい照明
装置を得ることができる。回折格子のピッチをＰ、入射
光の波長をλ、回折角をθで表すと、Ｐｓｉｎθ＝ｎλ
の条件を満たす角度θで回折が起こる。格子に平行な方
向の視野角θHおよび垂直な方向の視野角θVと輝度Ｇと
の関係は、一般に図６に示すようになる。なお、光拡散
板に拡散剤を添加することにより、図７に示すような視
野角θH，θVと輝度Ｇとの関係をもつ、より平坦な拡散
特性をもつ光拡散板を得ることができる。A light diffusing plate and a light source are provided such that a diffraction grating-like uneven structure is provided and diffracted light is generated in a direction perpendicular to the longitudinal direction of the linear light source as shown in FIG. Thereby, the diffusion characteristics in the direction perpendicular to the longitudinal direction of the light source can be improved, and a bright lighting device in which see-through is prevented can be obtained. When the pitch of the diffraction grating is represented by P, the wavelength of incident light is represented by λ, and the diffraction angle is represented by θ, P sin θ = nλ
Diffraction occurs at an angle θ that satisfies the condition The relationship between the viewing angle θ H in the direction parallel to the grating and the viewing angle θ V in the direction perpendicular to the grating and the luminance G is generally as shown in FIG. By adding a diffusing agent to the light diffusion plate, it is possible to obtain a light diffusion plate having a flatter diffusion characteristic having a relationship between viewing angles θ H and θ V and luminance G as shown in FIG. it can.
【００１２】照明装置の光拡散板として、光源側から観
視者側に透過する透過光の光線透過率が、観視者側から
光源側に透過する透過光の光線透過率よりも高いものを
用いれば、光源側から観視者側へ到達する光の透過率を
向上させることができ、光源の消費電力を低下させるこ
とができる。このような光拡散板は、光拡散板の光源側
にレンチキュラーレンズ状の凹凸構造、あるいはプリズ
ム状の凹凸構造を形成することにより得られる。A light diffusing plate of a lighting device having a light transmittance of transmitted light transmitted from the light source side to the viewer side is higher than a light transmittance of transmitted light transmitted from the viewer side to the light source side. If used, the transmittance of light reaching the viewer side from the light source side can be improved, and the power consumption of the light source can be reduced. Such a light diffusion plate can be obtained by forming a lenticular lens-shaped uneven structure or a prism-shaped uneven structure on the light source side of the light diffusion plate.
【００１３】照明装置の光拡散板として、光拡散板の長
辺方向に平行な方向における透過光の拡散特性と、光拡
散板の短辺方向に平行な方向における透過光の拡散特性
とが異なるものを用いれば、光源が長細い形状をしてい
る場合に、光源の短辺方向の光拡散性をより大きくする
ことができ、光線透過率を維持した状態で透け防止を図
ることができる。このような光拡散板は、光拡散板にレ
ンチキュラーレンズ状の凹凸構造、あるいはプリズム状
の凹凸構造を形成することにより得られる。[0013] As a light diffusing plate of the lighting device, the diffusion characteristic of transmitted light in a direction parallel to the long side direction of the light diffusing plate is different from the diffusion characteristic of transmitted light in a direction parallel to the short side direction of the light diffusing plate. If the light source has a long and thin shape, the light diffusion property in the short side direction of the light source can be further increased, and the light transmission can be prevented while maintaining the light transmittance. Such a light diffusion plate can be obtained by forming a lenticular lens-shaped uneven structure or a prism-shaped uneven structure on the light diffusion plate.
【００１４】照明装置の光拡散板として、光拡散板の主
面の法線方向に対して非対称であるものを用いれば、照
明装置を斜め方向から観視者が見る場合に、観視者側に
向けてより大きく光が拡散され、拡散させることが不要
な領域にはできるだけ光が拡散されないようにすること
ができる。このような光拡散板は、光拡散板の１つの主
面または２つの主面にプリズム状の凹凸構造を設ける
か、光拡散板の２つの主面にプリズム状の凹凸構造およ
びレンチキュラーレンズ状の凹凸構造をそれぞれ設ける
ことにより得られる。If a light diffusing plate that is asymmetric with respect to the normal direction of the main surface of the light diffusing plate is used as the light diffusing plate, when the observer views the lighting device obliquely, The light is diffused to a greater extent, and light can be prevented from being diffused as much as possible in a region that does not need to be diffused. Such a light diffusion plate is provided with a prismatic uneven structure on one or two main surfaces of the light diffusion plate, or a prismatic uneven structure and a lenticular lens shape on two main surfaces of the light diffusion plate. It is obtained by providing each of the uneven structures.
【００１５】本発明の照明装置における光源としては、
電球、蛍光灯、ＬＥＤ等を用いることができ、太陽光を
光源として用いても良い。点状光源であるか、線状光源
であるか、面状光源であるかに応じて光拡散板の凹凸構
造を適宜選択することができる。As a light source in the lighting device of the present invention,
A light bulb, a fluorescent lamp, an LED, or the like can be used, and sunlight may be used as a light source. The uneven structure of the light diffusion plate can be appropriately selected depending on whether the light source is a point light source, a linear light source, or a planar light source.
【００１６】本発明における光拡散板はメタクリル樹
脂、スチレン樹脂等により形成される。これらの樹脂中
に拡散剤を含有させても良い。拡散剤には、従来から用
いられているものを使用することが可能であり、無機系
の拡散剤としては炭酸カルシウム、硫酸バリウム、シリ
カ等の一種またはこれらを組み合わせた微粉末を使用す
ることができる。また、有機系の拡散剤としては、スチ
レン、ビニルトルエン、α−メチルスチレン、フェニル
メタクリレート、ベンジルメタクリレート、（メタ）ア
クリル酸メチル、（メタ）アクリル酸エチル、（メタ）
アクリル酸ブチル・（メタ）アクリル酸２−エチルへキ
シル、（メタ）アクリル酸２ーヒドロキシエチル，（メ
タ）アクリル酸、無水マレイン酸等のうち一種以上の単
官能性モノマーと、これらと共重合することのできるジ
エチレングリコールジ（メタ）アクリレート、１，３−
ブチレングリコールジ（メタ）アクリレート、トリメチ
ロールプロパントリ（メタ）アクリレート、アリル（メ
タ）アクリレート、ジビニルベンゼン、トリアリルシア
ヌレ−ト等の多官能性モノマーとを懸濁重合し、粒径５
〜２０ミクロンの微粒子としたものを使用することがで
きる。The light diffusing plate in the present invention is formed of methacrylic resin, styrene resin or the like. A diffusing agent may be contained in these resins. As the diffusing agent, those conventionally used can be used, and as the inorganic diffusing agent, one of calcium carbonate, barium sulfate, silica, and the like, or a fine powder obtained by combining these can be used. it can. Examples of the organic diffusing agent include styrene, vinyl toluene, α-methylstyrene, phenyl methacrylate, benzyl methacrylate, methyl (meth) acrylate, ethyl (meth) acrylate, and (meth)
One or more monofunctional monomers such as butyl acrylate, 2-ethylhexyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, (meth) acrylic acid, and maleic anhydride, and copolymerized with these monomers Diethylene glycol di (meth) acrylate, 1,3-
A polyfunctional monomer such as butylene glycol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, allyl (meth) acrylate, divinylbenzene, triallyl cyanurate is subjected to suspension polymerization to give a particle size of 5
Fine particles of up to 20 microns can be used.
【００１７】[0017]
【実施例】以下、実施例によって、本発明を具体的に説
明する。なお、表中の各測定値は、以下の方法で測定し
たものである。 ＜ピークゲイン、最大曲げ角＞光源（日本光学社製コリ
メーター）を光拡散板面に垂直に照射されるように配置
し、光拡散板面上における照度が１０ｌｘとなるように
する。また、光源と光拡散板との延長線上で光拡散板か
らの距離が１ｍの位置に輝度計を光拡散板に向けて設置
する。この条件で光拡散板面上の輝度を測定し、輝度
（ｃｄ／ｃｍ2）／照度（ｌｘ）の値をピークゲインＧ0
とする。次いで、光拡散板の表面に形成された凹凸構造
の長手方向と輝度計とによって形成される平面上で、光
拡散板の中心を中心点として輝度計を回転させ、サンプ
ル上の輝度がＧ0の３／４、１／２および１／３となっ
た位置の回転角をそれぞれ最大曲げ角度α'ｖ、αｖお
よびβｖで表す。光拡散板平面上で、光拡散板の表面に
形成された凹凸構造の長手方向と、該長手方向に対して
垂直な方向と、輝度計とによって形成される平面上で、
上記と同様な測定を行った時の回転角をそれぞれα'
Ｈ、αＨおよびβＨで表す。 ＜全光線透過率＞全光線透過率はＪＩＳ Ｋ−７１０５
に従い測定した。 ＜透け＞蛍光灯を２０ｍｍ間隔で３本平行に配置し、蛍
光灯との距離が２０ｍｍとなるように光拡散板を設置す
る。光拡散板から２ｍ離れた観視者が光拡散板を見て、
背後にある光源の透けを目視で観察した。The present invention will be described below in detail with reference to examples. In addition, each measurement value in a table | surface was measured by the following method. <Peak gain, maximum bending angle> A light source (a collimator manufactured by Nippon Kogaku Co., Ltd.) is arranged so as to be vertically irradiated on the light diffusion plate surface, and the illuminance on the light diffusion plate surface is 10 lx. Further, a luminance meter is installed facing the light diffusion plate at a position 1 m away from the light diffusion plate on an extension of the light source and the light diffusion plate. Under this condition, the luminance on the light diffusing plate surface is measured, and the value of luminance (cd / cm 2 ) / illuminance (lx) is calculated as a peak gain G 0.
And Then, on a plane formed by the luminance meter and the longitudinal direction of the uneven structure formed on the surface of the light diffusion plate, the luminance meter is rotated around the center of the light diffusion plate as a center point, and the luminance on the sample is G 0. Are represented by the maximum bending angles α′v, αv and βv, respectively. On the plane of the light diffusion plate, the longitudinal direction of the uneven structure formed on the surface of the light diffusion plate, the direction perpendicular to the longitudinal direction, and on the plane formed by the luminance meter,
The rotation angle when performing the same measurement as above is α '
H, αH and βH. <Total light transmittance> The total light transmittance is JIS K-7105.
It measured according to. <Transparency> Three fluorescent lamps are arranged in parallel at an interval of 20 mm, and a light diffusing plate is installed so that the distance from the fluorescent lamp is 20 mm. A viewer 2m away from the light diffuser looks at the light diffuser,
The see-through of the light source behind was visually observed.
【００１８】各実施例および比較例についての測定結果
を表１および表２に示す。Tables 1 and 2 show the measurement results for each of the examples and comparative examples.
【表１】 [Table 1]
【表２】 [Table 2]
【００１９】表１および表２に示されるように、本発明
の照明装置によれば、拡散剤の添加量を低減させること
ができるため、光線透過率を上げることが可能となり、
最大ゲインが大きい照明装置を得ることができる。ま
た、同じ明るさを得るために必要な光源の数を減らし、
あるいは単位光源あたりの電力を減らすことが可能とな
り、消費電力を低減することができる。さらに、従来と
同量の拡散剤を加えることにより、拡散特性をより向上
させることができる。As shown in Tables 1 and 2, according to the lighting device of the present invention, the amount of the diffusing agent added can be reduced, so that the light transmittance can be increased.
A lighting device with a large maximum gain can be obtained. Also, reduce the number of light sources required to get the same brightness,
Alternatively, power per unit light source can be reduced, and power consumption can be reduced. Further, by adding the same amount of the diffusing agent as in the prior art, the diffusion characteristics can be further improved.
【００２０】[0020]
【発明の効果】本発明によれば、高い光線透過率を有
し、かつ高い拡散特性を有する光拡散板を備えた照明装
置が提供される。According to the present invention, there is provided an illuminating device having a light diffusion plate having high light transmittance and high diffusion characteristics.
【図１】本発明の照明装置の概略斜視図である。FIG. 1 is a schematic perspective view of a lighting device of the present invention.
【図２】光拡散板と光源との配置の一例を示す図であ
る。FIG. 2 is a diagram illustrating an example of an arrangement of a light diffusion plate and a light source.
【図３】レンチキュラーレンズにおける視野角と輝度と
の一般的な関係を示す図である。FIG. 3 is a diagram showing a general relationship between a viewing angle and luminance in a lenticular lens.
【図４】光拡散板と光源との配置の他の一例を示す図で
ある。FIG. 4 is a diagram showing another example of the arrangement of the light diffusion plate and the light source.
【図５】光拡散板と光源との配置の他の一例を示す図で
ある。FIG. 5 is a diagram showing another example of the arrangement of the light diffusion plate and the light source.
【図６】回折格子における視野角と輝度との一般的な関
係を示す図である。FIG. 6 is a diagram showing a general relationship between a viewing angle and luminance in a diffraction grating.
【図７】拡散剤が添加された光拡散板における視野角と
輝度との一般的な関係を示す図である。FIG. 7 is a diagram showing a general relationship between a viewing angle and luminance in a light diffusion plate to which a diffusing agent is added.
【図８】従来の光拡散板の概略斜視図である。FIG. 8 is a schematic perspective view of a conventional light diffusing plate.
１：光拡散板 ２：透過光を屈折または回折させる凹凸構造 ３：光源 1: light diffusion plate 2: uneven structure for refracting or diffracting transmitted light 3: light source
Claims (11)
が少なくとも一つの主面に形成された光拡散板と光源と
を備えた照明装置。1. A lighting device comprising: a light source; and a light diffuser plate having at least one main surface having an uneven structure for refracting or diffracting transmitted light.
光線透過率が、観視者側から光源側に透過する透過光の
光線透過率よりも高い光拡散板を備えた請求項１記載の
照明装置。2. A light diffusing plate, wherein a light transmittance of transmitted light transmitted from the light source side to the viewer side is higher than a light transmittance of transmitted light transmitted from the viewer side to the light source side. The lighting device according to claim 1.
辺方向に平行な方向における透過光の拡散特性と、光拡
散板の短辺方向に平行な方向における透過光の拡散特性
とが異なる光拡散板を備えており、光源の短辺方向と光
拡散板の透過光の光拡散性が高い方向とが一致している
請求項１記載の照明装置。3. A light-diffusing plate having an elongated light source, wherein a diffusion characteristic of transmitted light in a direction parallel to a long side direction of the light diffusion plate and a diffusion characteristic of transmitted light in a direction parallel to a short side direction of the light diffusion plate are provided. The lighting device according to claim 1, further comprising different light diffusion plates, wherein a direction of a short side of the light source and a direction in which light diffusing property of transmitted light of the light diffusion plate is high coincide with each other.
板の面の法線方向に対して非対称であり、所定の角度の
範囲に強く光を拡散させるものである請求項１記載の照
明装置。4. The light diffusing plate according to claim 1, wherein the diffusion characteristic of transmitted light is asymmetric with respect to the normal direction of the surface of the light diffusing plate, and the light is diffused strongly within a predetermined angle range. Lighting equipment.
がレンチキュラーレンズ状である請求項１記載の照明装
置。5. The lighting device according to claim 1, wherein the uneven structure for refracting or diffracting the transmitted light has a lenticular lens shape.
手方向と、線状である光源の長手方向とが平行である請
求項５記載の照明装置。6. The lighting device according to claim 5, wherein a longitudinal direction of the lenticular lens-shaped uneven structure is parallel to a longitudinal direction of the linear light source.
がプリズム状である請求項１記載の照明装置。7. The lighting device according to claim 1, wherein the uneven structure for refracting or diffracting the transmitted light has a prism shape.
状である光源の長手方向とが平行である請求項７記載の
照明装置。8. The illumination device according to claim 7, wherein a longitudinal direction of the prism-shaped uneven structure is parallel to a longitudinal direction of the linear light source.
が回折格子状である請求項１記載の照明装置。9. The lighting device according to claim 1, wherein the uneven structure for refracting or diffracting the transmitted light has a diffraction grating shape.
直な方向に回折光が発生するように回折格子状の凹凸構
造が設けられた請求項９記載の照明装置。10. The lighting device according to claim 9, wherein a diffraction grating-like uneven structure is provided so that diffracted light is generated in a direction perpendicular to the longitudinal direction of the linear light source.
求項１記載の照明装置。11. The lighting device according to claim 1, wherein the light diffusing plate contains a diffusing agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10357322A JP2000182418A (en) | 1998-12-16 | 1998-12-16 | Lighting system with light diffusion plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10357322A JP2000182418A (en) | 1998-12-16 | 1998-12-16 | Lighting system with light diffusion plate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000182418A true JP2000182418A (en) | 2000-06-30 |
Family
ID=18453533
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10357322A Pending JP2000182418A (en) | 1998-12-16 | 1998-12-16 | Lighting system with light diffusion plate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000182418A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005321681A (en) * | 2004-05-11 | 2005-11-17 | Idemitsu Kosan Co Ltd | Prism-integrated optical diffusion plate and its manufacturing method |
| WO2005124399A1 (en) * | 2004-06-18 | 2005-12-29 | Toray Industries, Inc. | Anisotropic diffusion film |
| JP2007003852A (en) * | 2005-06-24 | 2007-01-11 | Sony Corp | Diffusion sheet, method for manufacturing diffusion sheet, backlight device and liquid crystal display device |
| WO2008050763A1 (en) * | 2006-10-27 | 2008-05-02 | Zeon Corporation | Direct backlight device |
| KR100897745B1 (en) * | 2002-06-26 | 2009-05-15 | 삼성전자주식회사 | Back light assembly and direct type liquid crystal display |
| WO2009090811A1 (en) * | 2008-01-15 | 2009-07-23 | Sharp Kabushiki Kaisha | Illuminating device, display device and television receiver |
| US7658502B2 (en) | 2003-12-29 | 2010-02-09 | Lg Display Co., Ltd. | Back light structure of liquid crystal display device |
| US7726826B2 (en) | 2004-08-24 | 2010-06-01 | Zeon Corporation | Direct-type backlight device |
-
1998
- 1998-12-16 JP JP10357322A patent/JP2000182418A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100897745B1 (en) * | 2002-06-26 | 2009-05-15 | 삼성전자주식회사 | Back light assembly and direct type liquid crystal display |
| US7658502B2 (en) | 2003-12-29 | 2010-02-09 | Lg Display Co., Ltd. | Back light structure of liquid crystal display device |
| JP2005321681A (en) * | 2004-05-11 | 2005-11-17 | Idemitsu Kosan Co Ltd | Prism-integrated optical diffusion plate and its manufacturing method |
| WO2005124399A1 (en) * | 2004-06-18 | 2005-12-29 | Toray Industries, Inc. | Anisotropic diffusion film |
| CN100430756C (en) * | 2004-06-18 | 2008-11-05 | 东丽株式会社 | Anisotropic diffusion film |
| US7726826B2 (en) | 2004-08-24 | 2010-06-01 | Zeon Corporation | Direct-type backlight device |
| JP2007003852A (en) * | 2005-06-24 | 2007-01-11 | Sony Corp | Diffusion sheet, method for manufacturing diffusion sheet, backlight device and liquid crystal display device |
| WO2008050763A1 (en) * | 2006-10-27 | 2008-05-02 | Zeon Corporation | Direct backlight device |
| WO2009090811A1 (en) * | 2008-01-15 | 2009-07-23 | Sharp Kabushiki Kaisha | Illuminating device, display device and television receiver |
| JPWO2009090811A1 (en) * | 2008-01-15 | 2011-05-26 | シャープ株式会社 | Lighting device, display device, and television receiver |
| US8425069B2 (en) | 2008-01-15 | 2013-04-23 | Sharp Kabushiki Kaisha | Lighting device, display device and television receiver |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| TWI494615B (en) | Optical prism sheet having a certain roughness thereon | |
| TWI378270B (en) | Diffuser prism sheet comprising light diffuser in the valley of prism and lcd back light unit thereby | |
| KR100864321B1 (en) | Diffuser prism sheet comprising amorphous light diffuser on the valley of prism and lcd back light unit thereby | |
| TWI461761B (en) | Light guide panel for liquid crystal display having light diffusion material and back light unit using thereof | |
| JP2011123379A (en) | Light beam control unit, direct backlight apparatus and liquid crystal display apparatus | |
| JP5736957B2 (en) | Light guide plate, surface light source device and display device | |
| TW200937085A (en) | Backlight unit | |
| JP2010500611A (en) | Condensing film for LCD backlight unit and LCD backlight unit using the same | |
| KR100793091B1 (en) | A brightness improving sheet and a backlight unit including the same | |
| JP2001235606A (en) | Optical member having reflective function and transmissive function | |
| JP2000182418A (en) | Lighting system with light diffusion plate | |
| KR102221196B1 (en) | A diffusion sheet having improved shielding performance and a backlight unit including the diffusion sheet | |
| KR100838681B1 (en) | Optical sheet, backlight unit and liquid crystal display device using the same | |
| JP2009025438A (en) | Diffusion sheet and direct type backlight unit using the same | |
| JP2007080800A (en) | Light guide plate of backlight unit | |
| JP5598010B2 (en) | Backlight unit and display device | |
| JP2009123397A (en) | Illumination device, and image display device using it | |
| JP2009080357A (en) | Light control sheet, backlight unit using the same, and display device | |
| KR20070040957A (en) | Prism sheet including reflection particles and backlight unit including the same | |
| JP2001154004A (en) | Optical sheet and backlight unit using the same | |
| KR100877411B1 (en) | A brightness enhancing sheet, a backlight unit, an lcd device including the same, and a method of manufacturing the same | |
| JP2000227772A (en) | Illumination device and signboard using the same | |
| JPH06265888A (en) | Surface light source element | |
| KR101158313B1 (en) | Optical film improving visibility | |
| KR101069934B1 (en) | Diffuser sheet with multi-function |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20050325 |
|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20071220 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20071225 |
|
| A521 | Written amendment |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20080225 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20080318 |
|
| A521 | Written amendment |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20080519 |
|
| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 20080610 |