JPH09159810A - Optical control sheet and surface light emitting device having the same - Google Patents
Optical control sheet and surface light emitting device having the sameInfo
- Publication number
- JPH09159810A JPH09159810A JP8192416A JP19241696A JPH09159810A JP H09159810 A JPH09159810 A JP H09159810A JP 8192416 A JP8192416 A JP 8192416A JP 19241696 A JP19241696 A JP 19241696A JP H09159810 A JPH09159810 A JP H09159810A
- Authority
- JP
- Japan
- Prior art keywords
- light
- sheet
- roll
- control sheet
- light control
- 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.)
- Withdrawn
Links
Landscapes
- Light Guides In General And Applications Therefor (AREA)
- Optical Elements Other Than Lenses (AREA)
- Liquid Crystal (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、光制御シート、お
よびこれを備えた面状発光装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light control sheet and a planar light emitting device including the light control sheet.
【０００２】本明細書において、「アルミニウム」とは
純アルミニウムのみならずアルミニウム合金をも意味す
ることとする。また、本明細書において、「シート」と
は、厚みによって定義される厳密な意味でのシートのみ
ならず、通常フィルムと呼ばれる薄手のものも含むこと
とする。In this specification, "aluminum" means not only pure aluminum but also an aluminum alloy. Further, in the present specification, the term “sheet” includes not only a sheet in the strict sense defined by the thickness but also a thin sheet usually called a film.
【０００３】[0003]
【従来の技術】パーソナルコンピュータや液晶テレビ等
において、液晶表示画面は自家発光性を有しないので、
視認性を高めるためには他からの照明を必要とし、その
ため、液晶表示素子の背面から光を当てる光源ユニット
（以下バックライトユニットという）が考案された。2. Description of the Related Art In a personal computer, a liquid crystal television, etc., a liquid crystal display screen does not have a self-luminous property.
In order to improve the visibility, it is necessary to illuminate the light source from other sources. Therefore, a light source unit (hereinafter referred to as a backlight unit) that illuminates the liquid crystal display device from the back surface has been devised.
【０００４】バックライトユニットは、その開発当初に
おいては螢光ランプ等の光源を液晶表示素子の背面に直
接配した構造をとっていたが、最近では全ユニットの厚
みを薄くして機器の小型化を図るために、光源を液晶表
示素子の少なくとも一側面に配したエッジライト方式と
いう構造をとることが多い。At the beginning of development, the backlight unit had a structure in which a light source such as a fluorescent lamp was arranged directly on the back surface of the liquid crystal display element, but recently, the thickness of the entire unit is reduced to make the device smaller. In order to achieve this, a structure called an edge light system in which a light source is arranged on at least one side surface of a liquid crystal display element is often adopted.
【０００５】エッジライト方式の面状光源装置は、図７
に示す基本構造を有する。すなわち、この装置では、光
源としての螢光管21は、透明板からなる導光板22の一側
面に配されている。導光板22の背面には塗料のドットパ
ターン24が形成されている。ドットパターン24は、側面
の螢光管21から入射した光を、画面のどの位置からも均
等に出射させるために導光板22の背面に形成された光散
乱性の印刷パターンであり、疑似光源と呼ばれるもので
ある。導光板22の後側には反射板25が配されている。An edge light type surface light source device is shown in FIG.
It has the basic structure shown in. That is, in this device, the fluorescent tube 21 as a light source is arranged on one side surface of the light guide plate 22 made of a transparent plate. A dot pattern 24 of paint is formed on the back surface of the light guide plate 22. The dot pattern 24 is a light-scattering print pattern formed on the back surface of the light guide plate 22 in order to uniformly emit the light incident from the fluorescent tube 21 on the side surface from any position on the screen. It is called. A reflection plate 25 is arranged on the rear side of the light guide plate 22.
【０００６】螢光管21から発せられた光線は、導光板端
面23より導光板内部に進入し、その背面のドットパター
ン24によって乱反射され、導光板表面より前方へ出射さ
れる。導光板22の表面より出射された光線の各出射角度
における強度分布、すなわち出射光パターン26を図８に
示す。図８では、出射光のほとんどは、導光板22の法線
方向から大きくはずれた方向へ出射され、またその分布
も著しく急峻である。このため、通常、導光板22の法線
方向より観察する使用者にとっては液晶表示画面が非常
に暗い画面となってしまう。The light beam emitted from the fluorescent tube 21 enters the inside of the light guide plate from the end face 23 of the light guide plate, is diffusely reflected by the dot pattern 24 on the back surface thereof, and is emitted forward from the surface of the light guide plate. FIG. 8 shows the intensity distribution of light rays emitted from the surface of the light guide plate 22 at each emission angle, that is, the emitted light pattern 26. In FIG. 8, most of the emitted light is emitted in a direction largely deviated from the normal direction of the light guide plate 22, and the distribution thereof is also extremely steep. Therefore, normally, the liquid crystal display screen becomes a very dark screen for the user who observes from the normal direction of the light guide plate 22.
【０００７】この欠点を克服するため、図９に示すよう
に、導光板22の表面上に光拡散シート27を設置する方法
が考案された。光拡散シート27は、透明なガラスまたは
プラスチックシートの表面に無機または有機の光拡散剤
を塗布したものや、透明プラスチックシートの表面にマ
ット加工やシボ加工などにより粗度Ｒａ＝１００〜１５
０μｍ程度の微細なランダム凹凸面を形成したものであ
る。この光拡散シート27を使用した場合の光線の各出射
角度における強度分布、すなわち出射光パターン28を図
９に示す。図９では、図８に比較して法線方向への光線
の出射が増加していることが分かる（特開昭６０−４６
５０３号公報参照）。In order to overcome this drawback, a method of installing a light diffusion sheet 27 on the surface of the light guide plate 22 was devised as shown in FIG. The light diffusing sheet 27 has a surface roughness of Ra = 100 to 15 obtained by coating a surface of a transparent glass or plastic sheet with an inorganic or organic light diffusing agent, or by matting or graining the surface of the transparent plastic sheet.
A fine random uneven surface of about 0 μm is formed. FIG. 9 shows the intensity distribution of light rays at each emission angle when the light diffusion sheet 27 is used, that is, the emitted light pattern 28. In FIG. 9, it can be seen that the emission of light rays in the normal direction is increased as compared with FIG. 8 (JP-A-60-46).
503).
【０００８】しかしながら、光拡散剤を用いた光拡散シ
ート27では、使用者に不用な方向への光線の出射が依然
として多く、また、光拡散シート27と導光板22の界面で
の乱反射による光線の損失も無視できない。そのため、
これをバックライト方式の液晶表示素子の照明装置に用
いた場合、正面方向への出射光量があまり多くない。ま
た、ランダム凹凸面を形成した光拡散シートでは、光拡
散剤を用いたシートよりは集光性に優れるが、最近のバ
ックライトの高輝度化等の要求に対しては完全なものと
はいえない。However, in the light diffusing sheet 27 using the light diffusing agent, many light rays are emitted in a direction unnecessary for the user, and the light rays are diffused at the interface between the light diffusing sheet 27 and the light guide plate 22. Loss cannot be ignored. for that reason,
When this is used in a lighting system of a backlight type liquid crystal display element, the amount of light emitted in the front direction is not so large. In addition, a light diffusion sheet having a random uneven surface has better light-collecting properties than a sheet using a light diffusing agent, but it is not perfect for recent demands for higher brightness of backlights. Absent.
【０００９】さらにこれらの欠点を改善する方法とし
て、前記光拡散シートに代え、図１０に示す構成のプリ
ズムシート29を用いることが試みられている。プリズム
シート29は片面に多数の小さなプリズムを並列状に並べ
たものであり、これに入射した光線を屈折あるいは反射
させる機能を有する光学機能シートである。このプリズ
ムシート29を用いた場合の光線の各出射角度における強
度分布、すなわち出射光パターン30では、図１１に示す
ように、法線方向への光線の出射が著しく増加してい
る。Further, as a method for improving these drawbacks, it has been attempted to use a prism sheet 29 having the structure shown in FIG. 10 instead of the light diffusion sheet. The prism sheet 29 is formed by arranging a large number of small prisms in parallel on one surface, and is an optical function sheet having a function of refracting or reflecting light rays incident on the prisms. As shown in FIG. 11, in the intensity distribution of light rays at respective emission angles when the prism sheet 29 is used, that is, in the emission light pattern 30, the emission of light rays in the normal direction is significantly increased.
【００１０】[0010]
【発明が解決しようとする課題】しかしながら、この場
合、出射光の指向性が強すぎるため視野角度が非常に狭
く、使用者の位置が僅かでも移動すると、観察される輝
度は急激に低下する。また、このようなプリズムシート
29は、表面光沢に優れるという特性を有するため、キズ
や付着異物による外観欠陥が発生し易い等の欠点をも
つ。However, in this case, since the directivity of the emitted light is too strong, the viewing angle is very narrow, and even if the position of the user moves even slightly, the observed brightness drops sharply. Also, such a prism sheet
Since No. 29 has a characteristic of having excellent surface gloss, it has a defect that an appearance defect due to scratches or adhered foreign matter is likely to occur.
【００１１】本発明の課題は、上記の点に鑑み、液晶表
示素子等に用いた場合に正面方向が充分明るくなるよう
な集光性と、ある程度の視野角度範囲内であれば均等に
明るく見えるという拡散性とを兼ね備え、且つキズ等の
外観欠陥の視認を防止した光制御シート、およびこれを
備えた面状発光装置を提供することにある。In view of the above points, an object of the present invention is to provide a light-collecting property that makes the front direction sufficiently bright when used in a liquid crystal display device and the like, and to appear evenly bright within a certain viewing angle range. Another object of the present invention is to provide a light control sheet which has the above-mentioned diffusibility and which prevents visual defects such as scratches from being visually recognized, and a planar light emitting device including the light control sheet.
【００１２】[0012]
【課題を解決するための手段】本発明による光制御シー
トは、ロール表面に陽極酸化処理が施されたアルミニウ
ム製エンボスロールを用いて成形され、一方の面が、規
則的な多数の略平行な波型を有し、その波型に中心線平
均粗さＲａが０．１μｍ〜１μｍとなるような微細な凹
凸加工が施されている構造面であり、他方の面が、光学
的な平面または該平面に微細な凹凸加工が施されたもの
であることを特徴とするものである。The light control sheet according to the present invention is formed by using an aluminum embossing roll whose surface is anodized, and one surface of which is formed by a large number of regular, substantially parallel. It is a structural surface having a corrugation, and the corrugated surface is subjected to fine concavo-convex processing such that the centerline average roughness Ra is 0.1 μm to 1 μm, and the other surface is an optical plane or It is characterized in that the flat surface is provided with fine unevenness.
【００１３】また、本発明による面状発光装置は、上記
の光制御シートを備えたものである。A planar light emitting device according to the present invention includes the above light control sheet.
【００１４】[0014]
【発明の実施の形態】本発明による光制御シートの一方
の面において、規則的な多数の略平行な波型よりなる構
造面は、集光機能に寄与する。また、微細な凹凸面より
なる構造面は、光拡散機能に寄与する。BEST MODE FOR CARRYING OUT THE INVENTION In one surface of a light control sheet according to the present invention, a structured surface having a large number of regular and substantially parallel corrugations contributes to a light collecting function. In addition, the structural surface made up of minute uneven surfaces contributes to the light diffusion function.
【００１５】波型としては、以下のようなものが例示さ
れる。Examples of corrugations include the following.
【００１６】ａ）横断面正弦波型のような規則的な波
型、 ｂ）プリズムシート（頂角略９０度）のように、横断面
略直角三角形の山部。A) A regular wave shape such as a sinusoidal cross section, b) a mountain portion having a substantially right triangle shape in cross section, such as a prism sheet (vertical angle of about 90 degrees).
【００１７】ここで、ｂ）の山部の頂および隣り合う山
部同士の間の谷には、やや丸みをつけるようにしてもよ
いが、その度合があまり大きすぎると集光機能を低下さ
せるので、曲率半径２５μｍ以下とするのが好ましい。Here, the peak of the mountain portion in b) and the valley between the adjacent mountain portions may be rounded, but if the degree is too large, the light collecting function is deteriorated. Therefore, the radius of curvature is preferably 25 μm or less.
【００１８】本発明による光制御シートにおいて、一方
の面の規則的な多数の略平行な波型の傾斜面が他方の面
となす角度は、シートの集光機能に寄与するため、用途
に応じて適宜設定する必要がある。例えば、液晶表示画
面のように明るさを必要とする用途に用いられる光制御
シートの場合、上記傾斜角度は、好適には４０度〜５０
度となされる。In the light control sheet according to the present invention, the angle formed by a large number of regular, substantially parallel corrugated inclined surfaces on one surface and the other surface contributes to the light condensing function of the sheet, and therefore depends on the application. Need to be set appropriately. For example, in the case of a light control sheet used for applications requiring brightness such as a liquid crystal display screen, the tilt angle is preferably 40 degrees to 50 degrees.
It is done once in a while.
【００１９】また、規則的な多数の略平行な波型の相互
間ピッチは、狭ければ狭いほど液晶表示画面の画質を向
上させることができ、好適には１５０μｍ以下、さらに
好適には１００μｍ以下となされる。Further, the narrower the pitch between the regular and substantially parallel corrugations is, the more the image quality of the liquid crystal display screen can be improved, and preferably 150 μm or less, more preferably 100 μm or less. Is made.
【００２０】拡散機能に寄与する形状としては、規則的
な多数の略平行な波型を有する面に微細な凹凸による極
薄のマット加工が施されている状態が好適である。マッ
ト濃度は、拡散機能に寄与するため、シートの用途に応
じて適宜に設定する必要がある。このマット濃度は、シ
ート表面の中心線平均粗さＲａにより定量化可能であっ
て、Ｒａ＝０．１μｍ〜１μｍの範囲であるのが好まし
い。Ｒａが小さいほど法線方向の輝度が向上するが、Ｒ
ａが０．１μｍ未満になると極端に光沢を有することに
なってギラツキが生じ、また、外観欠陥を生じ易い。逆
に、Ｒａが大きいほど視野角度が広がり、外観欠陥の発
生を抑えられるが、Ｒａが１μｍを越えると法線方向の
輝度が低下してしまう。As a shape that contributes to the diffusing function, it is preferable that the surface having a large number of regular substantially parallel corrugations is subjected to an ultrathin matting process with fine irregularities. Since the matte density contributes to the diffusion function, it needs to be appropriately set according to the application of the sheet. This matte concentration can be quantified by the center line average roughness Ra of the sheet surface, and Ra is preferably in the range of 0.1 μm to 1 μm. As Ra decreases, the brightness in the normal direction improves, but R
When a is less than 0.1 μm, it has an extremely high gloss and causes glare, and also tends to cause an appearance defect. On the contrary, the larger the Ra, the wider the viewing angle, and the occurrence of appearance defects can be suppressed. However, when Ra exceeds 1 μm, the luminance in the normal direction decreases.
【００２１】本発明において、シートの一方の面に上記
マット加工を施す方法は、ロール表面に陽極酸化処理が
施されたアルミニウム製エンボスロールを用いてシート
成形を行うものである。In the present invention, the method of subjecting one surface of the sheet to the above-mentioned mat processing is to perform sheet forming using an aluminum embossing roll whose roll surface is anodized.
【００２２】通常、エンボスロールは、ロール本体と、
これの両端中心部に突出状に設けられた軸芯とからな
り、ロール本体は、表面に所要の彫刻形状を有するロー
ル外筒部と、その内側のロール芯部とからなる。該ロー
ル本体は、ロール外筒部とロール芯部とが同一素材から
なる一体物となっていてもよい。Usually, the embossing roll includes a roll body and
The roll main body includes a roll outer cylinder portion having a required engraved shape on the surface, and a roll core portion inside thereof. In the roll main body, the roll outer cylinder part and the roll core part may be integrally formed of the same material.
【００２３】ロール本体のロール芯部および軸芯の素材
は、一般に金属ロールの軸芯として用いられるものであ
ればよく、特に限定されない。例えば、ＪＩＳ Ｈ００
０１に示されるアルミニウム合金や鋼材、ステンレス鋼
材等の鉄系素材が適宜選択される。The material of the roll core and the shaft core of the roll body is not particularly limited as long as it is generally used as the shaft core of a metal roll. For example, JIS H00
An iron-based material such as an aluminum alloy shown in 01, a steel material, and a stainless steel material is appropriately selected.
【００２４】他方、ロール外筒部には、素材として６０
００系合金や７０００系合金等のアルミニウムが用いら
れ、且つその表面に陽極酸化処理が施される。アルミニ
ウムを素材とすることにより、軽量で作業時の扱いが容
易となり、精緻な彫刻形状の加工性を得ることができ
る。また、その表面に陽極酸化処理が施されることによ
り、ロール表面の耐磨耗性、耐腐食性、耐擦傷性が向上
するとともに、酸化や汚れによるムラ模様が視認される
ことがないので、同ロールを用いて得られる型押し成形
シートにキズや付着異物による外観欠陥が生じることを
防止できる。On the other hand, the outer cylinder of the roll is made of a material of 60
Aluminum such as a 00 series alloy or a 7000 series alloy is used, and the surface thereof is anodized. By using aluminum as a material, it is lightweight and easy to handle at the time of work, and it is possible to obtain the workability of a fine engraving shape. Further, by subjecting the surface to anodizing treatment, abrasion resistance, corrosion resistance, and scratch resistance of the roll surface are improved, and since uneven patterns due to oxidation and dirt are not visually recognized, It is possible to prevent appearance defects due to scratches and adhered foreign matter from occurring on the embossed and molded sheet obtained by using the roll.
【００２５】ロール外筒部の表面に施される陽極酸化処
理の方法としては、例えば、電解液として硫酸、蓚酸、
クロム酸、リン酸、有機酸等を用いた陽極酸化法が挙げ
られる。表面処理によるマット濃度は、酸が濃い程濃く
なる。シート表面に光沢が要求されるときには、蓚酸を
用いた陽極酸化法が好適に用いられる。As a method of anodizing treatment applied to the surface of the outer cylinder of the roll, for example, sulfuric acid, oxalic acid, or
An anodic oxidation method using chromic acid, phosphoric acid, organic acid and the like can be mentioned. The matt density of the surface treatment increases as the acid density increases. When gloss is required on the surface of the sheet, the anodizing method using oxalic acid is preferably used.
【００２６】このようなエンボスロールを用いてシート
成形を行なうことにより、シートの一方の面に、上記の
条件を満たす良好なマット調の表面形状が得られる。By performing sheet forming using such an embossing roll, a good matte surface shape satisfying the above conditions can be obtained on one surface of the sheet.
【００２７】構造面の反対側の面は概ね平面であればよ
い。概ね平面とは、光学的に平面であるか、もしくは該
平面に微細な凹凸加工が施されている面をいう。この凹
凸加工の代表例はマット加工である。マットの粗度およ
び加工方法は特に限定されないが、該平面の表面粗度が
大きいほど正面輝度が低下するので、用途に応じて適宜
設定する。該平面の表面粗度は、好適にはＲａ＝０．０
３μｍ〜０．９μｍの範囲である。The surface opposite to the structural surface may be a substantially flat surface. The term “substantially flat” refers to an optically flat surface or a surface on which fine unevenness is applied. A typical example of this unevenness processing is mat processing. The roughness and processing method of the mat are not particularly limited, but the higher the surface roughness of the flat surface, the lower the front luminance, and therefore the roughness is appropriately set according to the application. The surface roughness of the plane is preferably Ra = 0.0.
It is in the range of 3 μm to 0.9 μm.
【００２８】光制御シートの材質は、透明なプラスチッ
クであれば特に限定されないが、光の出射方向を制御す
るという機能上、屈折率１．４以上のものが好ましい。
例えば、ポリメチルメタクリレート等のアクリル樹脂、
ポリエチレンテレフタレート等のポリエステル樹脂、ポ
リカーボネート樹脂、ポリスチレン樹脂、ポリ塩化ビニ
ル樹脂等が挙げられる。The material of the light control sheet is not particularly limited as long as it is a transparent plastic, but a material having a refractive index of 1.4 or more is preferable in view of the function of controlling the light emission direction.
For example, acrylic resin such as polymethylmethacrylate,
Examples thereof include polyester resins such as polyethylene terephthalate, polycarbonate resins, polystyrene resins and polyvinyl chloride resins.
【００２９】シートの全体厚みは、好ましくは平均５０
μｍ以上、さらに好ましくは平均１００μｍ〜３５０μ
ｍの範囲である。The total thickness of the sheet is preferably 50 on average.
μm or more, more preferably 100 μm to 350 μm on average
m.
【００３０】以上のとおり、本発明による光制御シート
は、正面方向の集光性と、ある程度の視野角度範囲内で
あれば均等に明るく見えるという拡散性とを兼ね備える
とともに、キズ等の外観欠陥の目立ちにくいものであ
る。As described above, the light control sheet according to the present invention has both the light-converging property in the front direction and the diffusivity that it appears uniformly bright within a certain viewing angle range, and at the same time, the appearance defects such as scratches are caused. It is inconspicuous.
【００３１】また、本発明による面状発光装置は、上記
の光制御シートを使用するものであり、これによって、
従来輝度不足や拡散性不足のために複数枚使用していた
光制御シートの枚数を減らしたり、バックライトの駆動
電力を低減させたりすることができる。The planar light emitting device according to the present invention uses the above-mentioned light control sheet.
It is possible to reduce the number of light control sheets that are conventionally used due to lack of brightness and diffusivity, and to reduce the driving power of the backlight.
【００３２】[0032]
【実施例】以下、実施例により本発明を具体的に説明す
る。The present invention will be described below in detail with reference to examples.
【００３３】実施例１ 図６において、シート成形装置のエンボスロール12は、
ロール本体13と、これの両端中心部に突出状に設けられ
た軸芯14とからなり、ロール本体13は、ロール外筒部15
と、その内側のロール芯部16とからなる。Example 1 In FIG. 6, the embossing roll 12 of the sheet forming apparatus is
A roll main body 13 and a shaft core 14 projectingly provided at both ends of the roll main body 13 are provided.
And the roll core portion 16 inside thereof.
【００３４】ロール外筒部15は、アルミニウム合金（６
０６１、質別Ｔ６）からなり、ロール芯部16および軸芯
14は機械構造用炭素鋼（ＪＩＳ Ｓ４５Ｃ）からなる。
ロール外筒部15とロール芯部16との間の空隙部には四条
スパイラル状の熱媒体流路が配され、同流路を１３５℃
に温度調節された機械油が循環することにより、ロール
全面にわたって均一な表面温度を与えて押出シートが成
形適温に保持されるようになされている。The outer cylinder portion 15 of the roll is made of aluminum alloy (6
061, T6 of temper, roll core 16 and shaft core
14 is made of carbon steel for machine structure (JIS S45C).
In the space between the roll outer cylinder portion 15 and the roll core portion 16, a four-row spiral heat medium flow passage is arranged, and the flow passage has a temperature of 135 ° C.
By circulating the temperature-controlled mechanical oil, a uniform surface temperature is given over the entire surface of the roll so that the extruded sheet is maintained at a suitable molding temperature.
【００３５】ロール外筒部15の表面には、精密切削研磨
により平滑処理が施された後、精密旋盤を用いてエンボ
スが形成され、更に電解液として硫酸を用いた陽極酸化
法により陽極酸化皮膜が形成され、その後、同皮膜に封
孔処理が施されている。The surface of the roll outer cylinder 15 is smoothed by precision cutting and polishing, and then embossed using a precision lathe, and further anodized by an anodizing method using sulfuric acid as an electrolytic solution. Is formed, and then the film is sealed.
【００３６】図６に示すシート成形装置において、Ｔダ
イ1 から押し出されたシート状ポリカーボネート溶融樹
脂18は、エンボスロール12およびゴムロール17によって
挟圧されながらエンボスロール12表面で固化し、次い
で、複数のアニールロール8 によって歪み除去された
後、搬送ロール9 を経て、２本の引取ロール10の間から
取り出される。こうして、上面にエンボスが施されかつ
全体厚みが１９０μｍのポリカーボネート樹脂よりなる
光制御シート31を得た。In the sheet forming apparatus shown in FIG. 6, the sheet-shaped polycarbonate molten resin 18 extruded from the T die 1 is solidified on the surface of the embossing roll 12 while being pressed by the embossing roll 12 and the rubber roll 17, and then a plurality of sheets are formed. After the strain is removed by the annealing roll 8, it is taken out from between the two take-up rolls 10 via the transport roll 9. In this way, a light control sheet 31 having an upper surface embossed and made of a polycarbonate resin having a total thickness of 190 μm was obtained.
【００３７】図１および図２に示すように、光制御シー
ト31の上面32は、横断面正弦波型であり、その波型にマ
ット加工により中心線平均粗さＲａが０．５μｍとなる
ような微細な凹凸が施されている構造面である。上面32
の正弦波型の最大傾斜角度は４５度であり、山間ピッチ
は１００μｍであり、山谷の曲率半径は１５μｍであ
る。下面36は、マット加工により中心線平均粗さＲａが
０．０８μｍとなるような微細な凹凸加工が施された概
ね平面である。なお、中心線平均粗さは、各面において
触針を（構造面については、正弦波型の山谷の長さ方向
に沿って）走査し、ＪＩＳ Ｂ ０６０１で定義される
Ｒａを測定したものである。As shown in FIGS. 1 and 2, the upper surface 32 of the light control sheet 31 has a sinusoidal cross section, and the center line average roughness Ra is 0.5 μm by mat processing on the corrugated shape. It is a structural surface that has fine irregularities. Top 32
The maximum inclination angle of the sine wave type is 45 degrees, the mountain pitch is 100 μm, and the radius of curvature of the peaks and valleys is 15 μm. The lower surface 36 is a substantially flat surface that is finely roughened by mat processing so that the centerline average roughness Ra becomes 0.08 μm. The center line average roughness is obtained by scanning the stylus on each surface (along the lengthwise direction of the sine wave type peaks and valleys for the structural surface), and measuring Ra defined in JIS B 0601. is there.
【００３８】実施例２ 図３および図４において、光制御シート34は、図６に示
すシート成形装置を用いて作製された全体厚みが１９５
μｍのポリカーボネート樹脂シートよりなり、その上面
35は、横断面直角三角形の頂角を有する多数の山部が平
行に形成されたプリズム面であり、そのプリズム面にマ
ット加工により中心線平均粗さＲａが０．５μｍとなる
ような微細な凹凸が施されている構造面である。上面35
の山部の傾斜角度は４５度であり、山間ピッチは１００
μｍであり、山谷の曲率半径は５μｍである。下面37
は、マット加工により中心線平均粗さＲａが０．０８μ
ｍとなるような微細な凹凸加工が施された概ね平面であ
る。Example 2 In FIGS. 3 and 4, the light control sheet 34 has an overall thickness of 195 produced by using the sheet forming apparatus shown in FIG.
Made of polycarbonate resin sheet of μm, its upper surface
Reference numeral 35 denotes a prism surface in which a large number of peaks having apexes of a right-angled triangle in a horizontal cross section are formed in parallel, and the center surface average roughness Ra becomes 0.5 μm by mat processing on the prism surface. It is a structural surface that is uneven. Top 35
The slope angle of the mountain part is 45 degrees, and the mountain pitch is 100.
μm, and the radius of curvature of the peaks and valleys is 5 μm. Bottom surface 37
Has a center line average roughness Ra of 0.08μ due to mat processing.
It is a substantially flat surface on which fine concavo-convex processing of m is performed.
【００３９】比較例１ 全体厚みが２００μｍであり、構造面32の中心線平均粗
さＲａが１５μｍである点を除いて、実施例１と同じ光
制御シートである。Comparative Example 1 The same light control sheet as in Example 1 except that the overall thickness is 200 μm and the center line average roughness Ra of the structure surface 32 is 15 μm.
【００４０】比較例２ 全体厚みが２００μｍであり、構造面35に光学的平面加
工が施されている点を除いて、実施例２と同じ光制御シ
ートである。Comparative Example 2 This is the same light control sheet as in Example 2 except that the overall thickness is 200 μm and the structural surface 35 is subjected to optical planar processing.
【００４１】上記実施例および比較例の光制御シートに
ついて物性評価を行った。各物性は下記の方法により測
定した。The physical properties of the light control sheets of the above Examples and Comparative Examples were evaluated. Each physical property was measured by the following methods.
【００４２】法線方向輝度：長辺１灯式バックライトの
決められた９点の正面方向からの輝度（法線方向）をＪ
ＩＳ Ｃ７６１に基いて測定し、その平均値を求めた。Luminance in the normal direction: The luminance (normal direction) from the front direction of 9 points determined by the one side long side backlight is J.
It measured based on IS C761 and calculated | required the average value.
【００４３】視野角度：長辺１灯式バックライトを蛍光
管と平行に１度刻みで回転させ、バックライト中央１点
の輝度を各角度において測定し、法線方向の５０％の輝
度を達成する角度を求めた。Viewing angle: The long side single-lamp type backlight is rotated in parallel with the fluorescent tube in steps of 1 degree, and the brightness of one point at the center of the backlight is measured at each angle to achieve a brightness of 50% in the normal direction. I found the angle to do.
【００４４】光沢度：ＪＩＳ Ｋ ７１０５に準じた方
法において、シートの構造面の山（谷）の長さ方向と平
行になるように平面側から入光し、入光角度および受光
角度を７５度としたときのシート反射率を測定した。Glossiness: In a method according to JIS K 7105, light is incident from the flat side so as to be parallel to the length direction of the ridges (valleys) of the structural surface of the sheet, and the incident angle and the light receiving angle are 75 degrees. The sheet reflectance at that time was measured.
【００４５】こうして得られた評価結果を、各光制御シ
ートの形状と併せて表１に示す。The evaluation results thus obtained are shown in Table 1 together with the shape of each light control sheet.
【００４６】[0046]
【表１】 実施例１の光制御シート31を用いた場合、導光板22の表
面より出射された光線の各出射角度における強度分布、
すなわち出射光パターン33を図５に示す。図５では、出
射光は導光板22の法線方向を中心としてその周囲に十分
な角度範囲で分布していることが認められる。[Table 1] When the light control sheet 31 of Example 1 is used, the intensity distribution at each emission angle of the light beam emitted from the surface of the light guide plate 22,
That is, the emitted light pattern 33 is shown in FIG. In FIG. 5, it is recognized that the emitted light is distributed in a sufficient angular range around the normal line direction of the light guide plate 22.
【００４７】[0047]
【発明の効果】本発明によれば、正面方向の集光性と、
ある程度の視野角度範囲内であれば均等に明るく見える
という拡散性とを兼ね備え、且つキズ等の外観欠陥の目
立ちにくい光制御シートを提供することができる。According to the present invention, the light collecting property in the front direction,
It is possible to provide a light control sheet that has the diffusivity of appearing to be uniformly bright within a certain viewing angle range and that has less noticeable appearance defects such as scratches.
【００４８】また、本発明によれば、従来よりも少ない
枚数の光制御シートを使用しても同様の輝度が得られ、
バックライトの駆動電力が少なくてすむ面状発光装置を
提供することができる。Further, according to the present invention, similar brightness can be obtained by using a smaller number of light control sheets than the conventional one.
It is possible to provide a planar light emitting device that requires less backlight driving power.
【図１】本発明による光制御シートの一例を示す横断面
図である。FIG. 1 is a cross-sectional view showing an example of a light control sheet according to the present invention.
【図２】図１中のＡ部拡大図である。FIG. 2 is an enlarged view of a portion A in FIG.
【図３】本発明による光制御シートの一例を示す横断面
図である。FIG. 3 is a cross-sectional view showing an example of a light control sheet according to the present invention.
【図４】図３中のＢ部拡大図である。FIG. 4 is an enlarged view of a B part in FIG.
【図５】本発明による光制御シートを用いた場合の出射
光特性を示す概略図である。FIG. 5 is a schematic diagram showing emission light characteristics when the light control sheet according to the present invention is used.
【図６】光制御シートの製造工程を示す概略図である。FIG. 6 is a schematic view showing a manufacturing process of the light control sheet.
【図７】エッジライト方式の面状発光装置を示す斜視図
である。FIG. 7 is a perspective view showing an edge light type planar light emitting device.
【図８】導光板単体での出射光特性を示す概略図であ
る。FIG. 8 is a schematic diagram showing emission light characteristics of a single light guide plate.
【図９】従来技術による光拡散シートを用いた場合の出
射光特性を示す概略図である。FIG. 9 is a schematic diagram showing emission light characteristics when a conventional light diffusion sheet is used.
【図１０】プリズムシートの斜視図である。FIG. 10 is a perspective view of a prism sheet.
【図１１】プリズムシートを用いた場合の出射光特性を
示す概略図である。FIG. 11 is a schematic diagram showing outgoing light characteristics when a prism sheet is used.
１：Ｔダイ ８：アニールロール ９：搬送ロール １０：引取ロール １２：エンボスロール １３：ロール本体 １４：軸芯 １５：ロール外筒部 １６：ロール芯部 １７：ゴムロール １８：シート状ポリカーボネート溶融樹脂 ２１：螢光管 ２２：導光板 ２３：導光板端面 ２４：ドットパターン ２５：反射板 ２６：出射光パターン ２７：光拡散シート ２８：出射光パターン ２９：プリズムシート ３０：出射光パターン ３１：光制御シート ３２：上面（構造面） ３３：出射光パターン ３４：光制御シート ３５：上面（構造面） ３６：下面 ３７：下面 1: T-die 8: Annealing roll 9: Conveying roll 10: Take-up roll 12: Embossing roll 13: Roll body 14: Shaft core 15: Roll outer cylinder part 16: Roll core part 17: Rubber roll 18: Sheet polycarbonate melt resin 21 : Fluorescent tube 22: Light guide plate 23: Light guide plate end surface 24: Dot pattern 25: Reflector plate 26: Emission light pattern 27: Light diffusion sheet 28: Emission light pattern 29: Prism sheet 30: Emission light pattern 31: Light control sheet 32: upper surface (structure surface) 33: emitted light pattern 34: light control sheet 35: upper surface (structure surface) 36: lower surface 37: lower surface
Claims (2)
ルミニウム製エンボスロールを用いて成形され、一方の
面が、規則的な多数の略平行な波型を有し、その波型に
中心線平均粗さＲａが０．１μｍ〜１μｍとなるような
微細な凹凸加工が施されている構造面であり、他方の面
が、光学的な平面または該平面に微細な凹凸加工が施さ
れたものであることを特徴とする光制御シート。1. A roll surface is formed by using an aluminum embossing roll whose anodizing treatment is applied, and one surface has a large number of regular substantially parallel corrugations, and the corrugation has a center line. It is a structure surface that has been subjected to fine unevenness processing such that the average roughness Ra is 0.1 μm to 1 μm, and the other surface is an optical plane or a surface that is finely unevenly processed. A light control sheet characterized in that
状発光装置。2. A planar light emitting device comprising the light control sheet according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8192416A JPH09159810A (en) | 1995-10-05 | 1996-07-22 | Optical control sheet and surface light emitting device having the same |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25871395 | 1995-10-05 | ||
| JP7-258713 | 1995-10-05 | ||
| JP8192416A JPH09159810A (en) | 1995-10-05 | 1996-07-22 | Optical control sheet and surface light emitting device having the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09159810A true JPH09159810A (en) | 1997-06-20 |
Family
ID=26507303
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8192416A Withdrawn JPH09159810A (en) | 1995-10-05 | 1996-07-22 | Optical control sheet and surface light emitting device having the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09159810A (en) |
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