JPH10166484A - Surface light source element and window - Google Patents

Surface light source element and window

Info

Publication number
JPH10166484A
JPH10166484A JP8336009A JP33600996A JPH10166484A JP H10166484 A JPH10166484 A JP H10166484A JP 8336009 A JP8336009 A JP 8336009A JP 33600996 A JP33600996 A JP 33600996A JP H10166484 A JPH10166484 A JP H10166484A
Authority
JP
Japan
Prior art keywords
light
sheet
resin
light guide
light source
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
Application number
JP8336009A
Other languages
Japanese (ja)
Inventor
Yasuko Hayashi
泰子 林
Kazukiyo Chiba
一清 千葉
Masaharu Oda
雅春 小田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Rayon Co Ltd
Original Assignee
Mitsubishi Rayon Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Rayon Co Ltd filed Critical Mitsubishi Rayon Co Ltd
Priority to JP8336009A priority Critical patent/JPH10166484A/en
Publication of JPH10166484A publication Critical patent/JPH10166484A/en
Pending legal-status Critical Current

Links

Abstract

PROBLEM TO BE SOLVED: To obtain a light deflecting sheet to which dust or foreign matters hardly adhere and which is hardly scratched, and large effect of altering a light traveling direction by incorporating different refractive indexes of resins of adjacent resin layers and forming a waved shape at one boundary of resin layer boundaries of a sheet section. SOLUTION: An effect of a resin sheet as a light deflecting sheet, i.e., degree of altering a light traveling direction is largely affected by a value of h/p. If both a pitch (p) and height (h) of waved shape in an x direction are constant, the value of h/p is preferably 1.5 to 10. In the panel light source element, as a light source 3, a linear light source such as a fluorescent lamp is used. This source is installed at an end face of a light guide 1. A light deflecting sheet 4 is installed on the light guide. The light guide is formed of transparent resin and has a function of outputting light entering from the end face in a surface direction. As such a light guide, there is, for example, a dot printed surface or roughed surface.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、光の進行方向を変
更可能なシート(以下「光変向シ−ト」という)を用い
た面光源素子及び窓に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface light source element and a window using a sheet capable of changing the traveling direction of light (hereinafter referred to as "light diverting sheet").

【0002】[0002]

【従来の技術及び発明が解決しようとする課題】液晶表
示装置、看板、大型看板等に使用される背面光源装置の
導光体から出射する光を観察者の方向に向ける用途や建
築物への日照をコントロ−ルする等の用途に使用される
光変向シ−トとしては、シ−ト表面に凹凸をつけたプリ
ズムシートが知られている。しかし、プリズムシートは
その凹凸面に埃が溜まり易く傷が付き易い点が問題であ
る。
2. Description of the Related Art There is a need for applications such as a liquid crystal display device, a signboard, a large signboard, and the like for directing light emitted from a light guide of a rear light source device toward an observer or a building. As a light diverting sheet used for applications such as controlling sunlight, a prism sheet having a sheet surface with irregularities is known. However, the prism sheet has a problem in that dust easily accumulates on the uneven surface thereof and is easily scratched.

【0003】この問題を解決するものとして特開平7-31
8709号公報は、2種の樹脂から製造しその境界面に凹凸
をつけたシ−トを開示している。しかし、通常この構造
のものは、2つの樹脂の吸水性が異なるために、反りや
すいという欠点がある。また、この公開特許公報の実施
例に示されているような、境界面の頂角が90度程度の
三角形状である場合、光の進行方向を変化させる効果は
十分でない。
To solve this problem, Japanese Patent Application Laid-Open No. 7-31
Japanese Patent No. 8709 discloses a sheet manufactured from two kinds of resins and having an uneven surface at its boundary. However, this structure usually has a drawback that the two resins are easily warped due to their different water absorption. Further, in the case where the vertex angle of the boundary surface is a triangular shape of about 90 degrees as shown in the example of this publication, the effect of changing the traveling direction of light is not sufficient.

【0004】一方、特開平3-256735号公報は、凹凸のあ
るシ−トをその間に空気層を残して接着した3層構造の
シ−トについて開示している。しかし、これは化粧材と
して使用するものであり、これを光変向シ−トとして使
用する例は知られていない。
On the other hand, Japanese Patent Laid-Open Publication No. Hei 3-256735 discloses a three-layered sheet in which an uneven sheet is bonded while leaving an air layer therebetween. However, this is used as a decorative material, and there is no known example of using it as a light turning sheet.

【0005】本発明の目的は、塵埃や異物が付着し難く
傷が付き難くて、光の進行方向を変える効果が大きい光
変向シ−トを提供することにある。
SUMMARY OF THE INVENTION An object of the present invention is to provide a light diverting sheet which is less likely to adhere to dust and foreign matter, is less likely to be damaged, and has a great effect of changing the traveling direction of light.

【0006】[0006]

【課題を解決するための手段】本発明の要旨は、透明な
樹脂からなる導光体の裏面に反射材を設置し、導光体の
x方向の少なくとも一方の端面(yz面)に光源を設置
し、導光体の表面から出射された光を、導光体の法線方
向に変化させる機能を有する光変向シ−トを導光体表面
に設置した面光源素子において、光変向シ−トとして、
透明な樹脂層aと透明な樹脂層bによって透明な樹脂層
cが挟まれた積層構造を有する外表面が平滑な樹脂シ−
トであって、隣接する樹脂層の樹脂の屈折率が異なり、
シ−トの厚み方向をy、幅方向をxとするときにxy断
面の樹脂層境界の少なくとも一方の境界に凹凸形状が形
成され、この凹凸形状のピッチPと高さhの比h/pの値が
1.5以上10以下である樹脂シ−トを用いた面光源素
子にある。
SUMMARY OF THE INVENTION The gist of the present invention is to provide a light guide made of a transparent resin on the back surface of which is provided with a reflector, and to provide a light source on at least one end face (yz plane) in the x direction of the light guide. A light diverting sheet having a function of changing the light emitted from the surface of the light guide in the normal direction of the light guide is provided on the surface light source element provided on the light guide surface. As a sheet,
A resin sheet having a laminated structure in which a transparent resin layer c is sandwiched between a transparent resin layer a and a transparent resin layer b and having a smooth outer surface.
The refractive index of the resin of the adjacent resin layer is different,
When the thickness direction of the sheet is y and the width direction is x, an irregular shape is formed on at least one of the boundaries of the resin layer in the xy section, and a ratio h / p of the pitch P of the uneven shape to the height h. Is a surface light source element using a resin sheet having a value of 1.5 or more and 10 or less.

【0007】また本発明の要旨は、窓ガラス、これを保
持する窓枠、及び窓ガラスの内側または外側に樹脂シ−
トが配置された窓であって、樹脂シートとして前記樹脂
シートを用いた窓にある。
Further, the gist of the present invention is to provide a window glass, a window frame for holding the window glass, and a resin seal inside or outside the window glass.
And a window using the resin sheet as the resin sheet.

【0008】3層構造の樹脂シートにおいて、x方向、
y方向、z方向はそれぞれ直交する3軸方向であり、y
は厚み方向、xは幅方向であって、凹凸形状はxy断面
に形成されている。ピッチpは、xy断面に現れるの樹
脂層境界面の凹凸形状のうちの一単位分の凹凸の幅であ
る。また幅hは、一単位分の凹凸の高さである。
In a resin sheet having a three-layer structure, in the x direction,
The y direction and the z direction are three axial directions orthogonal to each other.
Is the thickness direction, x is the width direction, and the concavo-convex shape is formed in the xy cross section. The pitch p is the width of the concavo-convex shape for one unit of the concavo-convex shape of the resin layer boundary surface appearing in the xy cross section. The width h is the height of one unit of unevenness.

【0009】[0009]

【発明の実施の形態】以下、図面を参照しつつ説明す
る。図1〜図4は各樹脂シートのxy断面における凹凸
状態を示すものであり、境界面は折れ線状、鋸刃状、半
円状、半楕円状、波形状、n次の放物線状または1/n次の
放物線状等の形状をとることができる。これらの中で
も、折れ線状、鋸刃状等略直線状のものは、光を拡散す
ることなく進行方向のみを変化させるので好ましい形状
である。
Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 to 4 show the uneven state in the xy cross section of each resin sheet, and the boundary surface is a polygonal line shape, a saw blade shape, a semicircular shape, a semielliptical shape, a wave shape, an nth parabolic shape or 1 /. It can take a shape such as an n-th parabolic shape. Among them, a substantially linear shape such as a polygonal line shape or a saw blade shape is a preferable shape because only the traveling direction is changed without diffusing light.

【0010】樹脂シ−トの光変向シ−トとしての効果、
即ち光の進行方向を変化させる度合いは、h/pの値に大
きく影響される。x方向の凹凸形状のピッチ pと高さh
が共に一定である場合は、h/pの値は1.5以上10以
下であることが好ましい。
The effect of the resin sheet as a light diverting sheet,
That is, the degree of changing the traveling direction of light is greatly affected by the value of h / p. The pitch p and height h of the uneven shape in the x direction
Is constant, the value of h / p is preferably 1.5 or more and 10 or less.

【0011】樹脂シートを構成する各樹脂層に使用され
る樹脂としては、ポリエチレンテレフタレート、ポリ塩
化ビニル、ポリスチレン、ポリカーボネート、アクリル
系樹脂、非晶質ポリオレフィン、ポリアミド、これらの
共重合体樹脂、ブレンド樹脂等の熱可塑性樹脂を挙げる
ことができる。
The resin used for each resin layer constituting the resin sheet includes polyethylene terephthalate, polyvinyl chloride, polystyrene, polycarbonate, acrylic resin, amorphous polyolefin, polyamide, a copolymer resin thereof, and a blend resin. And the like.

【0012】隣接する樹脂層の各樹脂の屈折率差は0.
1以上0.3以下であることが好ましい。屈折率差が小
さすぎると光の方向を曲げる作用が弱くなる。一方、屈
折率差が大きすぎると特殊な樹脂を使うことが必要とな
りコストが高くなる。好ましい樹脂の組み合わせとし
て、ポリカ−ボネ−ト、ポリエチレンテレフタレ−ト、
ポリスチレン又はポリエチレン等と、ポリメチルメタク
リレ−トとの組み合わせが挙げられる。尚、隣接する樹
脂の密着性等を考慮して樹脂を選定することが好まし
い。
The difference between the refractive indices of the resins in adjacent resin layers is 0.1.
It is preferably from 1 to 0.3. If the refractive index difference is too small, the effect of bending the direction of light will be weak. On the other hand, if the refractive index difference is too large, it is necessary to use a special resin, which increases the cost. Preferred combinations of resins include polycarbonate, polyethylene terephthalate,
Examples include a combination of polystyrene or polyethylene with polymethyl methacrylate. In addition, it is preferable to select a resin in consideration of the adhesiveness between adjacent resins.

【0013】3層構造の樹脂シートの両表面の樹脂aと
樹脂bは同一の樹脂とすることもでき、又異なる樹脂と
することもできる。但し、シートの反りの防止を考慮す
ると、同一の樹脂または吸水性が同程度の樹脂を使用す
ることが望ましい。
The resin a and the resin b on both surfaces of the resin sheet having a three-layer structure may be the same resin or different resins. However, in consideration of prevention of sheet warpage, it is preferable to use the same resin or a resin having a similar water absorption.

【0014】本発明の樹脂シートは、例えば溶融押出機
を用いて、樹脂a、樹脂bと樹脂cが積層されるように
共押し出しする方法によって製造することができる。ま
た、本発明の樹脂シ−トは、それぞれ一方の面に凹凸形
状を形成した樹脂aのシート及び樹脂bのシートを、そ
れらの各凹凸面を所定間隔をもって対向させその間に他
の樹脂cの原料(単量体等)を流し込んだ後、それを重
合させることによって製造することができる。
The resin sheet of the present invention can be manufactured by, for example, a coextrusion method in which a resin a, a resin b, and a resin c are laminated using a melt extruder. In addition, the resin sheet of the present invention comprises a sheet of resin a and a sheet of resin b each having an uneven surface formed on one surface, with the respective uneven surfaces facing each other at a predetermined interval, and the other resin c being interposed therebetween. It can be produced by pouring a raw material (a monomer or the like) and then polymerizing it.

【0015】次に、本発明の面光源素子について説明す
る。本発明の樹脂シ−トは、光の進行方向を変える作用
が大きいので光変向シ−トとして用いることができる。
Next, the surface light source device of the present invention will be described. Since the resin sheet of the present invention has a large effect of changing the traveling direction of light, it can be used as a light diverting sheet.

【0016】本発明の面光源素子においては、図5に示
すように光源3として蛍光灯等の線状の光源が用いられ
る。この光源は導光体1の端面に設置される。導光体の
上には光変向シ−ト4が設置される。
In the surface light source element of the present invention, a linear light source such as a fluorescent lamp is used as the light source 3 as shown in FIG. This light source is installed on the end face of the light guide 1. A light diverting sheet 4 is provided on the light guide.

【0017】導光体は透明な樹脂からなり、端面から入
射した光を面方向に出射する機能を有する。このような
導光体としては、例えば、表面にドット印刷や粗面加工
が施されたものがある。通常、導光体から出射する光
は、その最大強度を示す方向が、表面法線に対して斜め
方向にあることが多い。この光の向きを観察者が位置す
る法線方向に変角させるために光変向シ−トが用いられ
る。
The light guide is made of a transparent resin and has a function of emitting light incident from an end face in a plane direction. As such a light guide, for example, there is a light guide whose surface is subjected to dot printing or rough surface processing. Usually, the direction of the light emitted from the light guide, which shows the maximum intensity, is often oblique to the surface normal. A light deflection sheet is used to change the direction of this light to the normal direction where the observer is located.

【0018】本発明の面光源素子における光変向シ−ト
の好ましい使用方法を以下に述べる。導光体面上に光変
向シ−トは一枚または二枚載せられる。光変向シ−トを
一枚載せる場合は、光変向シ−トの角度は、シ−トのx
方向が線光源に対して0から20度の範囲になるように
載置する。角度がこれより大きくなると光を変角する作
用が弱くなる。シ−トを二枚載せる場合は、1枚目のシ
−トを前記条件で載置し、2枚目のシ−トのx方向が1
枚目のx方向に対して、0から90度の範囲で傾くよう
に載せる。このときの傾きは90度であることが好まし
い。
A preferred method of using the light diverting sheet in the surface light source device of the present invention will be described below. One or two light diverting sheets are placed on the light guide surface. When one light diverting sheet is mounted, the angle of the light diverting sheet is x of the sheet.
It is mounted so that the direction is in the range of 0 to 20 degrees with respect to the line light source. If the angle is larger than this, the effect of changing the angle of light becomes weaker. When loading two sheets, the first sheet is placed under the above conditions, and the x direction of the second sheet is 1
The sheet is placed so as to be inclined in the range of 0 to 90 degrees with respect to the x direction of the sheet. The inclination at this time is preferably 90 degrees.

【0019】導光体と光変向シ−トの間には、導光体の
ドット印刷の目隠しのために拡散シ−トを設置すること
ができる。拡散シ−トとしては、樹脂シ−ト上に細かい
凹凸形状をつけたものや微粒子を含む塗料を印刷したも
のが挙げられる。
A diffusion sheet can be provided between the light guide and the light diverting sheet to blind the dot printing of the light guide. Examples of the diffusion sheet include a resin sheet having fine irregularities on a resin sheet and a resin sheet printed with a paint containing fine particles.

【0020】次に光変向シ−トを窓材として用いる場合
の好ましい使用方法を図6を用いて説明する。窓ガラス
7は窓枠8で固定され、窓の内側または外側に光変向シ
−ト9が設置される。これによって室内に差し込む太陽
10の光の方向を変化させることができる。
Next, a preferred method of using the light diverting sheet as a window material will be described with reference to FIG. The window glass 7 is fixed by a window frame 8, and a light diverting sheet 9 is installed inside or outside the window. Thereby, the direction of the light of the sun 10 inserted into the room can be changed.

【0021】[0021]

【実施例】以下実施例により本発明を具体的に説明す
る。尚、光学的な評価は以下の通りである。
The present invention will be described in detail with reference to the following examples. The optical evaluation is as follows.

【0022】(1)光変向機能の測定 図7に示すように光変向シ−トのxz面の法線方向に対
して、xy面内で30度傾いた方向から、平行光を光変
向シ−トに入射する。シ−トの光源の反対側に設置した
検出器をxy面内で動かし、出射光強度が最大になる角
度を検出する。
(1) Measurement of light diverting function As shown in FIG. 7, parallel light is emitted from a direction inclined by 30 degrees in the xy plane with respect to the normal direction of the xz plane of the light diverting sheet. It is incident on the deflection sheet. The detector installed on the opposite side of the light source of the sheet is moved in the xy plane, and the angle at which the intensity of the emitted light is maximized is detected.

【0023】(2)法線方向輝度の測定 図8に示すように、面光源素子の光出射面のz方向の中
央部の幅20mmの部分を測定領域とした。光入射面か
らx方向に初めの5mmを除外して、20mm角の正方
形に区分し、これを領域1、2、3、・・・、nとする。
導光体のx方向の一方の端面(yz面)に設置した冷陰
極管 (KC130T4E 4mmφ×130mm、松下電
器(株)製)をインバ−タ−(TDK(株)製CXA-
M10L)を介して直流電源に接続し、DC12Vを印加し
て点灯させる。
(2) Measurement of Luminance in Normal Direction As shown in FIG. 8, a central area of the light emitting surface of the surface light source element in the z direction in a width of 20 mm was defined as a measurement area. Excluding the first 5 mm in the x direction from the light incident surface, the light incident surface is divided into squares of 20 mm square, and these are defined as regions 1, 2, 3,..., N.
A cold cathode tube (KC130T4E, 4 mmφ × 130 mm, manufactured by Matsushita Electric Co., Ltd.) installed on one end surface (yz surface) of the light guide in the x direction is connected to an inverter (CXA- manufactured by TDK Corporation).
M10L) to connect to a DC power supply and apply DC12V to light up.

【0024】面光源素子を測定台に載置する。次に、測
定領域1の中央部を通る、xz面の法線方向に輝度計
(ミノルタ(株)製nt-1°)の光軸を一致させる。さら
に、輝度計の測定円が8〜9mmφになるように面光源素
子からの距離をとって、輝度計を固定する。
The surface light source element is mounted on a measuring table. Next, the optical axis of a luminance meter (nt-1 ° manufactured by Minolta Co., Ltd.) is made to coincide with the normal direction of the xz plane passing through the center of the measurement area 1. Further, the luminance meter is fixed at a distance from the surface light source element so that the measurement circle of the luminance meter is 8 to 9 mmφ.

【0025】この状態で、測定領域1の法線輝度を測定
し、この値をG1とする。面光源素子をx方向に20mm
移動し、領域2の法線輝度値を測定し、この値をG2と
する。この操作を繰り返して、全領域G1〜Gnについて
法線輝度値を測定し、その平均値を、面光源素子の平均
輝度とする。
In this state, the normal luminance of the measurement area 1 is measured, and this value is defined as G1. 20 mm surface light source element in x direction
It moves and measures the normal luminance value of the area 2, and this value is defined as G2. By repeating this operation, normal luminance values are measured for all the regions G1 to Gn, and the average value is used as the average luminance of the surface light source element.

【0026】参考例1 樹脂a及び樹脂bとしてポリカーボネート(三菱瓦斯化
学(株)製ユーピロンH−3000)用い、樹脂cとし
てポリメチルメタクリレート(三菱レイヨン(株)製ア
クリペットVH)を用いた。
Reference Example 1 Polycarbonate (Iupilon H-3000 manufactured by Mitsubishi Gas Chemical Co., Ltd.) was used as resin a and resin b, and polymethyl methacrylate (Acrypet VH manufactured by Mitsubishi Rayon Co., Ltd.) was used as resin c.

【0027】表面に凹凸形状を持つ金型と表面が平滑な
金型の間に樹脂bを挟み、熱プレスによって形状を転写
してシ−ト1を製造した。また表面が平滑な金型2枚の
間に樹脂aを挟み、熱プレスによって両面が平滑なシ−
ト2を製造した。
Sheet 1 was manufactured by sandwiching resin b between a mold having an uneven surface and a mold having a smooth surface, and transferring the shape by hot pressing. In addition, a resin a is sandwiched between two molds having smooth surfaces, and both sides are smoothed by hot pressing.
To 2 was manufactured.

【0028】次に、シ−ト1の凹凸面とシ−ト2の間に
樹脂cを挟み、熱プレスして3層構造の樹脂シ−トを得
た(図1)。得られたシ−トは、外表面が平滑で反りが
無く、外観及び光透過率が良好であった。樹脂層bと樹
脂層cとの凹凸界面のpは0.15mm、h/pは8.
0であった。
Next, a resin c was sandwiched between the uneven surface of the sheet 1 and the sheet 2 and hot pressed to obtain a resin sheet having a three-layer structure (FIG. 1). The resulting sheet had a smooth outer surface, no warpage, and good appearance and light transmittance. P at the uneven interface between the resin layer b and the resin layer c is 0.15 mm, and h / p is 8.
It was 0.

【0029】図7に示すように、この樹脂シ−トの樹脂
層b側を光源に向け、xz面の法線から30度傾いた方
向から光を入射させたところ、出射光強度が最大になる
角度は2度であった。
As shown in FIG. 7, when the resin sheet b side of the resin sheet is directed to the light source and light is incident from a direction inclined by 30 degrees from the normal to the xz plane, the intensity of the emitted light is maximized. The angle was 2 degrees.

【0030】実施例1 これは小型面光源素子の実施例である。厚み3mm、幅
100mm、長さ105mmのアクリル樹脂板の裏面に
酸化チタン粒子を含んだ白色塗料を用いて、斑点パタ−
ンをスクリ−ン印刷によって形成して、これを導光体と
した。
Embodiment 1 This is an embodiment of a small surface light source element. Using a white paint containing titanium oxide particles on the back surface of an acrylic resin plate having a thickness of 3 mm, a width of 100 mm and a length of 105 mm,
The screen was formed by screen printing to form a light guide.

【0031】導光体の長さ方向の2つのxy端面と一つ
のyz端面に銀蒸着したPET(ポリエチレンテレフタレ
−ト)粘着材で貼り付け、導光体の裏面に銀蒸着したPE
Tフィルムをテ−プ止めして反射面を形成した。さらに
導光体の他の一つのyz面の脇に冷陰極管を設置した。
A silver-evaporated PET (polyethylene terephthalate) adhesive material is adhered to two xy end surfaces and one yz end surface in the length direction of the light guide, and a silver-evaporated PE is formed on the back surface of the light guide.
The T film was taped to form a reflective surface. Further, a cold-cathode tube was installed beside another yz plane of the light guide.

【0032】一方、参考例1のシ−トを100mm
(x)、105mm(z)に切断して、光変向シ− ト
とした。上記導光体のyz面上に、光変向シ−トを樹脂
層b側を導光体面に向けて、導光体のz方向と光変向シ
−トのz方向を一致させて設置した。 このようにして
製造した小型面光源素子の輝度を測定したところ平均輝
度は3300cd/m2であった。
On the other hand, the sheet of Reference Example 1 was 100 mm
(X), cut into 105 mm (z) to obtain a light diverting sheet. On the yz plane of the light guide, a light diverting sheet is installed with the resin layer b side facing the light guide surface and the z direction of the light guide and the z direction of the light diverting sheet coincide. did. When the luminance of the small surface light source element manufactured as described above was measured, the average luminance was 3300 cd / m 2 .

【0033】実施例2 これは窓の実施例である。参考例1のシ−トを1900
mm(x)、1500mm(z)に切断して光変向シ−
トとした。この光変向シ−トをそれと同サイズの窓ガ
ラスの内側に、樹脂層b側が屋外になるように、かつシ
−トのZ軸が水平になるようにして設置した。このシ−
トにより室内に入る西日を防ぐことができた。
Embodiment 2 This is an embodiment of the window. The sheet of Reference Example 1 was 1900
mm (x), 1500mm (z)
And This light diverting sheet was placed inside a window glass of the same size as the sheet so that the resin layer b side was outdoors and the Z axis of the sheet was horizontal. This sheet
This prevented the west sun from entering the room.

【0034】比較例1 PETフィルム上に屈折率1.53のアクリル系紫外線硬化樹
脂で、頂角90度、ピッチ50μmの柱状プリズム単位
を、互いの長手方向が平行になるように多数形成してプ
リズムシ−トを製造した。参考例1と同様にこのシ−ト
の光変向機能を測定したところ、出射光強度が最大にな
る角度は0度であった。
COMPARATIVE EXAMPLE 1 A prism sheet was formed by forming a large number of columnar prism units having a vertical angle of 90 ° and a pitch of 50 μm on a PET film with an acrylic UV curable resin having a refractive index of 1.53 so that their longitudinal directions were parallel to each other. Manufactured. When the light diverting function of this sheet was measured in the same manner as in Reference Example 1, the angle at which the intensity of the emitted light was maximum was 0 degrees.

【0035】次にこの光変向シ−トを、プリズムの長手
方向と、導光体のz軸が平行に、プリズム面が上向きに
なるようにして、実施例1と同様の導光体上に設置して
面光源素子を製造し、輝度を測定したところ平均輝度は
3350cd/m2であった。この面光源素子は光変向
シ−トが傷つきやすかった。
Next, this light diverting sheet is placed on a light guide similar to that of the first embodiment, with the longitudinal direction of the prism parallel to the z-axis of the light guide and the prism surface facing upward. To produce a surface light source element, and the luminance was measured. The average luminance was 3350 cd / m 2 . In this surface light source element, the light deflection sheet was easily damaged.

【0036】[0036]

【発明の効果】本発明の面光源素子は光の方向を効率的
に変更させることが出来、塵埃や異物が付着し難く傷も
付き難い。また本発明の窓は太陽光の遮光効果が優れて
いる。
According to the surface light source device of the present invention, the direction of light can be efficiently changed, and it is difficult for dust and foreign matter to adhere to the surface light source device and it is unlikely to be damaged. Further, the window of the present invention has an excellent effect of blocking sunlight.

【図面の簡単な説明】[Brief description of the drawings]

【図1】樹脂シートのxy断面における凹凸状態を示す
図である。
FIG. 1 is a diagram showing an uneven state in an xy cross section of a resin sheet.

【図2】樹脂シートのxy断面における凹凸状態を示す
図である。
FIG. 2 is a diagram showing an uneven state in an xy cross section of a resin sheet.

【図3】樹脂シートのxy断面における凹凸状態を示す
図である。
FIG. 3 is a diagram showing an uneven state in an xy cross section of the resin sheet.

【図4】樹脂シートのxy断面における凹凸状態を示す
図である。
FIG. 4 is a diagram showing an uneven state in an xy cross section of the resin sheet.

【図5】面光源素子の斜視図である。FIG. 5 is a perspective view of a surface light source element.

【図6】窓の斜視図である。FIG. 6 is a perspective view of a window.

【図7】光変向シ−トの評価方法を示す図である。FIG. 7 is a diagram showing a method for evaluating a light turning sheet.

【図8】面光源素子の評価方法を示す図である。FIG. 8 is a diagram showing a method for evaluating a surface light source element.

【符号の説明】[Explanation of symbols]

1 導光体 2 反射材 3 蛍光管 4 光変向シ−ト 5 面光源素子 6 輝度計 7 窓ガラス 8 窓枠 9 光変向シ−ト 11 光源 12 光変向シ−ト 13 検出器 DESCRIPTION OF SYMBOLS 1 Light guide 2 Reflector 3 Fluorescent tube 4 Light diverting sheet 5 Surface light source element 6 Luminance meter 7 Window glass 8 Window frame 9 Light diverting sheet 11 Light source 12 Light diverting sheet 13 Detector

───────────────────────────────────────────────────── フロントページの続き (72)発明者 小田 雅春 神奈川県川崎市多摩区登戸3816番地 三菱 レイヨン株式会社東京技術・情報センタ− 内 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masaharu Oda 3816 Noborito, Tama-ku, Kawasaki City, Kanagawa Prefecture Mitsubishi Rayon Co., Ltd. Tokyo Technology and Information Center

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 透明な樹脂からなる導光体の裏面に反射
材を設置し、導光体のx方向の少なくとも一方の端面
(yz面)に光源を設置し、導光体の表面から出射され
た光を、導光体の法線方向に変化させる機能を有する光
変向シ−トを導光体表面に設置した面光源素子におい
て、光変向シ−トとして、透明な樹脂層aと透明な樹脂
層bによって透明な樹脂層cが挟まれた積層構造を有す
る外表面が平滑な樹脂シ−トであって、隣接する樹脂層
の樹脂の屈折率が異なり、シ−トの厚み方向をy、幅方
向をxとするときにxy断面の樹脂層境界の少なくとも
一方の境界に凹凸形状が形成され、この凹凸形状のピッ
チPと高さhの比h/pの値が1.5以上10以下である樹
脂シ−トを用いた面光源素子。
1. A reflector is provided on the back surface of a light guide made of a transparent resin, a light source is installed on at least one end surface (yz surface) in the x direction of the light guide, and light is emitted from the surface of the light guide. In a surface light source element in which a light diverting sheet having a function of changing the applied light in the normal direction of the light guide is provided on the surface of the light guide, a transparent resin layer a is used as a light diverting sheet. A resin sheet having a laminated structure in which a transparent resin layer c is sandwiched between a transparent resin layer b and a transparent resin layer b has a smooth outer surface. When the direction is y and the width direction is x, an uneven shape is formed on at least one of the resin layer boundaries of the xy cross section, and the value of the ratio h / p of pitch P to height h of the uneven shape is 1. A surface light source element using a resin sheet of 5 or more and 10 or less.
【請求項2】 窓ガラス、これを保持する窓枠、及び窓
ガラスの内側または外側に樹脂シ−トが配置された窓で
あって、樹脂シートとして請求項1に記載の樹脂シート
を用いた窓。
2. A window glass, a window frame for holding the same, and a window in which a resin sheet is disposed inside or outside the window glass, wherein the resin sheet according to claim 1 is used as the resin sheet. window.
JP8336009A 1996-12-16 1996-12-16 Surface light source element and window Pending JPH10166484A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8336009A JPH10166484A (en) 1996-12-16 1996-12-16 Surface light source element and window

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8336009A JPH10166484A (en) 1996-12-16 1996-12-16 Surface light source element and window

Publications (1)

Publication Number Publication Date
JPH10166484A true JPH10166484A (en) 1998-06-23

Family

ID=18294757

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8336009A Pending JPH10166484A (en) 1996-12-16 1996-12-16 Surface light source element and window

Country Status (1)

Country Link
JP (1) JPH10166484A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002214411A (en) * 2001-01-19 2002-07-31 Fujitsu Ltd Optical sheet, illuminator and optical member
JP2002350615A (en) * 2001-05-23 2002-12-04 Enplas Corp Assembly of diffusing member, surface light source device and image display device
JPWO2005124399A1 (en) * 2004-06-18 2008-04-10 東レ株式会社 Anisotropic diffusion film
JP2010533893A (en) * 2007-07-17 2010-10-28 クリー エル イー ディー ライティング ソリューションズ インコーポレイテッド Optical element having internal optical function and method for manufacturing the same

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002214411A (en) * 2001-01-19 2002-07-31 Fujitsu Ltd Optical sheet, illuminator and optical member
JP4597390B2 (en) * 2001-01-19 2010-12-15 シャープ株式会社 Optical sheet, illumination device, and liquid crystal display device
JP2002350615A (en) * 2001-05-23 2002-12-04 Enplas Corp Assembly of diffusing member, surface light source device and image display device
JP4640897B2 (en) * 2001-05-23 2011-03-02 株式会社エンプラス Diffusion member assembly, surface light source device, and image display device
JPWO2005124399A1 (en) * 2004-06-18 2008-04-10 東レ株式会社 Anisotropic diffusion film
JP4793263B2 (en) * 2004-06-18 2011-10-12 東レ株式会社 Direct type backlight
JP2010533893A (en) * 2007-07-17 2010-10-28 クリー エル イー ディー ライティング ソリューションズ インコーポレイテッド Optical element having internal optical function and method for manufacturing the same

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