JPH0643310A - Film or sheet for surface light source device - Google Patents
Film or sheet for surface light source deviceInfo
- Publication number
- JPH0643310A JPH0643310A JP4199576A JP19957692A JPH0643310A JP H0643310 A JPH0643310 A JP H0643310A JP 4199576 A JP4199576 A JP 4199576A JP 19957692 A JP19957692 A JP 19957692A JP H0643310 A JPH0643310 A JP H0643310A
- Authority
- JP
- Japan
- Prior art keywords
- sheet
- light source
- film
- source device
- light
- 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
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は面光源装置用フィルム又
はシートに関する。特に、厚みの薄い表示装置、例え
ば、液晶を用いた表示装置のバックライトに好適な面光
源装置に使用される面光源装置用フィルム又はシートに
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film or sheet for a surface light source device. In particular, the present invention relates to a film or sheet for a surface light source device used in a surface light source device suitable for a backlight of a thin display device, for example, a display device using liquid crystal.
【０００２】[0002]
【従来の技術】ワープロ、パソコン、液晶テレビ等の液
晶を用いた厚みの薄い表示装置は、液晶自体が発光しな
いために、通常、バックライトを使用している。このバ
ックライトは厚みが薄く、しかも、表示装置の面をほぼ
均一に照射させる必要がある。かかるバックライトに
は、通常、面光源装置が使用される。この面光源装置と
しては種々あるが、最も多く使用されている面光源装置
は、導光板の端面に光源を設け、この光源から照射され
る光を導光板の表面や導光板に取り付けられた板の表面
からほぼ均一に出光させるエッヂライト方式の面光源装
置がある。2. Description of the Related Art A thin display device using liquid crystal, such as a word processor, a personal computer, and a liquid crystal television, usually uses a backlight because the liquid crystal itself does not emit light. This backlight needs to be thin and to illuminate the surface of the display device almost uniformly. A surface light source device is usually used for such a backlight. Although there are various types of surface light source devices, the most widely used surface light source device has a light source provided on the end surface of the light guide plate, and the light emitted from the light source is a plate attached to the surface of the light guide plate or the light guide plate. There is an edge light type surface light source device that emits light almost uniformly from the surface.
【０００３】又、特開平２−２５７１８８号公報に記載
あり、図１２に示すように、拡散板１０７の裏面に光源
を設け、この拡散板１０７の裏側から光を照射させ、こ
の拡散板１０７の表面や拡散板１０７に取り付けられた
規制板からほぼ均一に出光させるものもある。尚、この
面光源装置には導光板を用いない。Further, as disclosed in Japanese Patent Application Laid-Open No. 2-257188, as shown in FIG. 12, a light source is provided on the back surface of the diffusion plate 107, and light is emitted from the back side of the diffusion plate 107, and There is also one that emits light almost uniformly from the surface or a regulation plate attached to the diffusion plate 107. A light guide plate is not used in this surface light source device.
【０００４】近年、薄型やカラー化に対応するために、
表示装置のバックライトの輝度向上の要求が高まってい
る。そこで、同じ光源で輝度を向上させるためには、面
光源装置の出光させる方向を規制して、使用者の見る方
向に効率よく光を出光させ、輝度を向上させることが必
要である。通常、使用者は表示装置の正面から見ること
が多いから、光を正面方向に多く出光させる必要がある
が、余り狭い範囲に強く光を出すと、使用者が少し見る
方向を変えただけで見えなくなるから、適宜範囲に光を
拡散させる必要がある。In recent years, in order to support thinning and colorization,
There is an increasing demand for improving the brightness of the backlight of a display device. Therefore, in order to improve the brightness with the same light source, it is necessary to regulate the light emitting direction of the surface light source device so that the light is efficiently emitted in the direction viewed by the user to improve the brightness. Usually, the user often sees from the front of the display device, so it is necessary to emit a lot of light in the front direction, but if the light is emitted strongly in a too narrow range, the user may change the viewing direction slightly. Since it becomes invisible, it is necessary to diffuse the light in an appropriate range.
【０００５】かかる面光源装置として、従来、導光板の
端面に光源を設けたエッヂライト方式の面光源装置が多
く使用されるから、この面光源装置を例に挙げて更に詳
細に説明すると、一般に、厚みの薄い導光板の端面に光
源を設け、この端面から光を入光させると、空気と導光
板との屈折率の差により、光は全反射を繰り返し、導光
板から外に殆ど出ない。そこで、面光源装置では導光板
の裏面に乱反射層を設け、更に、この裏面に反射板を取
り付け、導光板の裏面に当たる光を乱反射層で乱反射さ
せ、この乱反射した光を直接または反射板で反射させ
て、導光板の外側に出光させるものである。As such a surface light source device, an edge light type surface light source device in which a light source is provided on an end face of a light guide plate is conventionally used in many cases. Therefore, the surface light source device will be described in more detail as an example. When a light source is provided on the end face of the thin light guide plate and light is incident from this end face, the light is repeatedly totally reflected due to the difference in the refractive index between air and the light guide plate, and hardly exits from the light guide plate. . Therefore, in the surface light source device, a diffuse reflection layer is provided on the back surface of the light guide plate, and a reflection plate is attached to the back surface of the light guide plate so that light impinging on the back surface of the light guide plate is diffusely reflected by the diffuse reflection layer, and the diffuse reflection light is reflected directly or by the reflection plate. The light is emitted to the outside of the light guide plate.
【０００６】この乱反射層を設ける方法としては、スク
リーン印刷等によりビーズをドット印刷する方法が多く
用いられている。しかし、導光板の端面に設けられた光
源から照射された光は、通常、図８に示すように、導光
板から表面に対して非常に小さい角度で出光する。即
ち、極めて指向性が強い。As a method of providing this irregular reflection layer, a method of dot-printing beads by screen printing is often used. However, the light emitted from the light source provided on the end face of the light guide plate is usually emitted from the light guide plate at a very small angle with respect to the surface, as shown in FIG. That is, the directivity is extremely strong.
【０００７】このことを図８を参照しながら、更に詳細
に説明すると、図８において１０１は裏面に乱反射層が
設けられた透明な導光板であり、この導光板１０１の裏
面に反射板１０２を設け、この導光板１０１の端面に線
状の光源１０３を設けたものであり、この光源１０３か
ら放射された光は導光板１０１の中を透り、導光板１０
１の裏面に設けられた乱反射層で乱反射され、導光板１
０１ら直接出るか、反射板１０２に反射されて導光板１
０１の表面から出る。そのときのＡ点の光は図８のＢの
ように、導光板１０１との角度が小さい極めて方向性の
強い光である。This will be described in more detail with reference to FIG. 8. In FIG. 8, 101 is a transparent light guide plate having a diffused reflection layer provided on the back surface, and the reflection plate 102 is provided on the back surface of the light guide plate 101. The linear light source 103 is provided on the end face of the light guide plate 101, and the light emitted from the light source 103 passes through the light guide plate 101 and the light guide plate 10
1 is diffusely reflected by the diffused reflection layer provided on the back surface of the light guide plate 1.
01 or the light guide plate 1 after being reflected by the reflection plate 102.
It goes out from the surface of 01. The light at the point A at that time is light with a very strong directionality, which has a small angle with the light guide plate 101, as shown in FIG. 8B.
【０００８】しかし、このように導光板との角度が小さ
い方向で使用者が見ることは稀であるから、この光の出
光する角度を変えることが必要である。この方向性を改
良するために、図９に示すように、導光板１０１の表面
に拡散板１０４を設ける方法が提案されている。この拡
散板１０４は透明なプラスチックシート表面に白色顔料
を含む塗料を塗布したり、透明プラスチックシート表面
に微細な凹凸を設け（マット加工、シボ加工等）たもの
である。However, since it is rare for the user to see in such a direction that the angle with the light guide plate is small, it is necessary to change the angle at which this light is emitted. In order to improve this directionality, as shown in FIG. 9, a method of providing a diffusion plate 104 on the surface of the light guide plate 101 has been proposed. The diffusion plate 104 is one in which a coating material containing a white pigment is applied to the surface of a transparent plastic sheet, or fine irregularities are provided on the surface of the transparent plastic sheet (matting, graining, etc.).
【０００９】この拡散板を設けると、図９のＣに示すよ
うに、拡散板に直角な方向の光が増加する。しかし、こ
の拡散板を使用する装置では、図９から判るように、使
用者に不要な方向への光線が多く、正面方向の光が少な
く、輝度が小さい。従って、この前に表示装置を置くと
暗い画面となる。この暗い画面の原因としては、拡散板
と導光板との界面での反射による光線の損失も無視でき
ない。When this diffusing plate is provided, as shown in FIG. 9C, the amount of light in the direction perpendicular to the diffusing plate increases. However, in the device using this diffuser plate, as can be seen from FIG. 9, there are many light rays in a direction unnecessary for the user, there is little light in the front direction, and the brightness is low. Therefore, if a display device is placed before this, a dark screen is obtained. As a cause of this dark screen, the loss of light rays due to reflection at the interface between the diffusion plate and the light guide plate cannot be ignored.
【００１０】かかる欠点を改良するものとして、特開平
２−１７号公報に記載あり、図１０に示すように、この
導光板の表面に、断面三角形状の凹凸条を設けた透明プ
リズムフィルムまたはシート１０６を、凹凸条の面を導
光板に当接させて設けた面光源装置が知られている。即
ち、この面光源装置は指向性の強い光を使用者が見る方
向に透明プリズムフィルムまたはシート１０６の断面三
角形状の傾斜面で変え、透明プリズムフィルムまたはシ
ート１０６の凹凸条と反対側の面、即ち、透明プリズム
フィルムまたはシート１０６の表面から出光させるもの
である。As a means for improving such a defect, it is described in Japanese Patent Application Laid-Open No. 2-17, and as shown in FIG. 10, a transparent prism film or sheet in which an uneven strip having a triangular cross section is provided on the surface of this light guide plate. There is known a surface light source device in which 106 is provided by bringing the surface of the uneven strip into contact with the light guide plate. That is, this surface light source device changes light having a strong directivity in the direction in which the user sees it with the inclined surface of the transparent prism film or sheet 106 having a triangular cross section, and That is, the light is emitted from the surface of the transparent prism film or sheet 106.
【００１１】[0011]
【発明が解決しようとする課題】しかし、この面光源装
置を発明者が実験したところ、透明プリズムフィルム又
はシートを設けることにより、光の方向を使用者が見る
方向に効率よく変えて出光させることができるが、導光
板の裏面に設けられた乱反射層が見えるという問題があ
る。この乱反射層が見える面光源装置の上に液晶を用い
た表示装置を置くと、表示装置の画面がひどく見難くな
る。However, as a result of experiments conducted by the inventor of this surface light source device, a transparent prism film or sheet is provided so that the direction of light can be efficiently changed to the direction viewed by the user. However, there is a problem in that the irregular reflection layer provided on the back surface of the light guide plate can be seen. When a display device using liquid crystal is placed on the surface light source device where the irregular reflection layer can be seen, the screen of the display device becomes extremely difficult to see.
【００１２】又、この透明プリズムフィルム又はシート
から出る光の配光特性を調べたところ、図１１のＤに示
すように、指向性が強過ぎる。従って、使用者が見る方
向が少し変えただけで、見えなくなるという問題があ
る。上記公報では、導光板の出光面を梨地状にして拡散
性を持たせることを提案しているが、光の指向性が改善
されるが、乱反射層が見えたり、表示装置の画面が見難
いということは殆ど改善されない。When the light distribution characteristics of the light emitted from the transparent prism film or sheet were examined, the directivity was too strong as shown in D of FIG. Therefore, there is a problem that the user cannot see the image even if the user changes the direction in which the image is seen. In the above publication, it is proposed that the light exit surface of the light guide plate has a satin finish so as to have diffusivity. However, although the directivity of light is improved, it is difficult to see the diffuse reflection layer or the screen of the display device. That is hardly improved.
【００１３】又、この液晶を用いた表示装置としては、
ワープロ、パソコン、液晶テレビ等が高級になり、小型
になるに従って厚みの薄いものが要求されている。同時
に、この液晶を用いた表示装置を照射する面光源装置
も、表示装置と同様に、厚みの薄いものが要求されてい
る。この面光源装置を薄くするためには導光板を薄くす
る必要があるが、導光板を薄くすると、乱反射層が更に
ハッキリと見えるようになり、この面光源装置の前に液
晶を用いた表示装置を置くと、表示装置の画面が更に見
難くなるという問題がある。Further, as a display device using this liquid crystal,
As word processors, personal computers, liquid crystal televisions, etc. become more sophisticated and smaller, thinner ones are required. At the same time, a surface light source device that illuminates a display device using this liquid crystal is also required to have a small thickness, like the display device. To reduce the thickness of this surface light source device, it is necessary to reduce the thickness of the light guide plate. However, if the thickness of the light guide plate is reduced, the diffuse reflection layer can be seen more clearly, and a display device using liquid crystal is provided in front of this surface light source device. Is placed, there is a problem that the screen of the display device becomes more difficult to see.
【００１４】又、透明プリズムフィルム又はシートの凹
凸条と反対側の面、即ち、表面が平面であると、この上
に表示装置を重合すると、表面の平らな面と表示装置の
裏面との間に生ずる微細な間隙によって、表示装置にニ
ュートンリング状の干渉縞が生ずるという問題もある。
そこで、本発明の目的は、使用者の見る方向に適宜の広
がりがあり、明るい画面に改善できる面光源装置用フィ
ルム又はシートを提供することである。本発明の他の目
的は透光性フィルム又はシートの表面での反射を少なく
し、干渉縞をなくすると同時に、乱反射層を見えなくし
た面光源装置用フィルム又はシートを提供することであ
る。Further, if the surface of the transparent prism film or sheet opposite to the concavo-convex stripes, that is, the surface is a flat surface, when the display device is superposed on it, the surface between the flat surface and the back surface of the display device is overlapped. There is also a problem that the Newton-ring-shaped interference fringes are generated in the display device due to the minute gap generated in the above.
Therefore, an object of the present invention is to provide a film or sheet for a surface light source device, which has an appropriate spread in the viewing direction of a user and can improve a bright screen. Another object of the present invention is to provide a film or sheet for a surface light source device in which reflection on the surface of the translucent film or sheet is reduced, interference fringes are eliminated, and at the same time, the irregular reflection layer is invisible.
【００１５】[0015]
【課題を解決するための手段】本発明は上記問題を解決
し、上記目的を達成するためになされたものであって、
透光性フィルム又はシートの一面に凹凸条が設けられて
いて、この凹凸条は凹凸条を横切る断面形状がＹ＝ａ・
ｓｉｎｂＸ（Ｙ：厚み方向の座標・単位ｍｍ、Ｘ：凹凸
条を横切る方向の座標・単位ｍｍ、ａおよびｂ：係数）
で表される正弦曲面になされているものである。The present invention has been made to solve the above problems and achieve the above objects.
An uneven strip is provided on one surface of the translucent film or sheet, and the uneven strip has a cross-sectional shape of Y = a.
sinbX (Y: coordinate in the thickness direction, unit mm, X: coordinate in the direction crossing the uneven strip, unit mm, a and b: coefficient)
It is a sine curved surface represented by.
【００１６】本発明において透光性フィルム又はシート
とはガラスや透明な合成樹脂等の光を透す透光性物質を
フィルム又はシート状に成形させたものである。特に、
合成樹脂製のフィルムまたはシートが好適である。ここ
でいう透明な合成樹脂としては、ポリカーボネート、ポ
リメチルメタクリル、ポリエステル、セルロース系合成
樹脂、ポリスチレン等が好適である。In the present invention, the translucent film or sheet is a film or sheet formed of a translucent substance that transmits light, such as glass or transparent synthetic resin. In particular,
A film or sheet made of synthetic resin is suitable. Polycarbonate, polymethylmethacryl, polyester, cellulosic synthetic resin, polystyrene and the like are suitable as the transparent synthetic resin.
【００１７】この合成樹脂製の面光源装置用フィルム又
はシートの好ましい製造方法としては、透明な合成樹脂
を押し出し、エンボスロールを通して表面に凹凸条を設
けて成形する方法や、表面に凹凸条が穿設された型板を
使用して合成樹脂をプレス加工する方法や、内面に凹凸
条が穿設された型の中に合成樹脂を射出させる方法等が
ある。本発明においては、この透光性フィルム又はシー
トの一面に正弦曲面からなる凹凸条を設けているが、こ
の正弦曲面と反対側の面は必要に応じて平面、微細な凹
凸を設けた面（マット加工、シボ加工）、凹凸条等種々
な面にすることができる。As a preferable method for producing the film or sheet for surface light source device made of synthetic resin, a method of extruding a transparent synthetic resin and forming an uneven line on the surface through an embossing roll to form it, or a method of forming an uneven line on the surface. There are a method of pressing a synthetic resin using an installed mold plate, a method of injecting a synthetic resin into a mold having an inner surface provided with concave and convex stripes, and the like. In the present invention, an uneven line formed of a sinusoidal curved surface is provided on one surface of the translucent film or sheet, but the surface opposite to this sinusoidal curved surface is a flat surface if necessary, a surface provided with fine unevenness ( Various surfaces such as matte processing, texture processing, and uneven lines can be formed.
【００１８】例えば、図１２に示す面光源装置の如く、
導光板を使用しない面光源装置の場合には、この透光性
フィルム又はシートの裏面が密着することがないから、
裏面を平面にした面光源用フィルム又はシートが好適に
使用できる。又、図２に示す面光源装置の如く、導光板
を使用する面光源装置の場合には、この透光性フィルム
又はシートの裏面を導光板に密着させて使用するから、
この透光性フィルム又はシートの裏面が平板であると、
この裏面と導光板との微細な間隙によってニュートンリ
ング状の干渉縞が生ずることがある。従って、かかる場
合には、透光性フィルム又はシートの正弦曲面と反対側
の面に凹凸を設ける方が好ましい。For example, as in the surface light source device shown in FIG.
In the case of a surface light source device that does not use a light guide plate, since the back surface of this translucent film or sheet does not adhere,
A surface light source film or sheet having a flat back surface can be preferably used. In the case of a surface light source device that uses a light guide plate, such as the surface light source device shown in FIG. 2, the back surface of this transparent film or sheet is used in close contact with the light guide plate.
When the back surface of this translucent film or sheet is a flat plate,
Due to the minute gap between the back surface and the light guide plate, Newton ring-shaped interference fringes may occur. Therefore, in such a case, it is preferable to provide unevenness on the surface of the translucent film or sheet opposite to the sinusoidal curved surface.
【００１９】例えば、この反対側の面をサンドブラスト
等によって微細な凹凸にすると、ニュートンリング条の
干渉縞が現れなくなると共に、光が拡散されるので好ま
しい。又、この反対側の面を正弦曲面からなる凹凸状や
断面三角形状の凹凸条にすると光の方向性が改善され
る。その際、発明者の実験によれば、この反対側の凹凸
条の周期を正弦曲面からなる凹凸条の周期と同じにし、
且つ、振幅が１／２にすると更によい結果が得られる。For example, it is preferable that the surface on the opposite side is made finely uneven by sandblasting or the like, because interference fringes of Newton's ring stripes will not appear and light will be diffused. Further, if the surface on the opposite side is made into an uneven shape having a sinusoidal curved surface or an uneven line having a triangular cross section, the directionality of light is improved. At that time, according to the inventor's experiment, the cycle of the concavo-convex stripes on the opposite side is made the same as the cycle of the concavo-convex stripes made of a sinusoidal curved surface,
Moreover, if the amplitude is halved, a better result can be obtained.
【００２０】このように、正弦曲面からなる凹凸条の反
対側の面を種々変えることにより、種々異なった結果が
得られるから、導光板の屈折率、厚み、面光源装置用フ
ィルム又はシートの屈折率等によって表面の正弦曲面と
の組み合わを適当にして利用するとよい。本発明におい
て、凹凸条の形状は、凹凸条を横切る断面形状がＹ＝ａ
・ｓｉｎｂＸで表される正弦曲面になされている。この
正弦曲面の各記号や厚みは適宜でよいが、本発明者の実
験によれば、ａが２００〜２００００、ｂが０．００５
〜１の範囲が好ましく、又、透光性フィルムまたはシー
トの平均厚みは０・０１ｍｍ〜３ｍｍの範囲が好適であ
る。As described above, various results can be obtained by variously changing the surface on the opposite side of the uneven surface formed of the sinusoidal curved surface. Therefore, the refractive index and thickness of the light guide plate and the refraction of the film or sheet for the surface light source device can be improved. The combination with the sinusoidal surface of the surface may be appropriately used depending on the rate or the like. In the present invention, the shape of the uneven strip is such that the cross-sectional shape crossing the uneven strip is Y = a.
-It has a sinusoidal curved surface represented by sinbX. Each symbol and thickness of this sinusoidal curved surface may be appropriate, but according to the experiments conducted by the present inventor, a is 200 to 20,000 and b is 0.005.
The average thickness of the translucent film or sheet is preferably 0.01 mm to 3 mm.
【００２１】又、透光性フィルム又はシートの中に拡散
材を含有させてもよい。この拡散材とは含有させること
により透光性フィルム又はシートに光を拡散する性能を
付与するものである。この拡散材としては、炭酸カルシ
ウム粉末、酸化チタン粉末、亜鉛華等の白色顔料やアル
ミナ粉末、シリカ粉末、白土等の白色無機粉末やガラス
ビーズやガラス繊維や透光性フィルム又はシートと屈折
率の異なる合成樹脂粉末等が好適である。A diffusing material may be contained in the translucent film or sheet. This diffusing material imparts a light diffusing property to the translucent film or sheet when contained. As the diffusing material, calcium carbonate powder, titanium oxide powder, white pigment such as zinc white, alumina powder, silica powder, white inorganic powder such as clay, glass beads, glass fiber, translucent film or sheet and a refractive index Different synthetic resin powders and the like are suitable.
【００２２】又、この拡散材の含有率はガラスや合成樹
脂等の透光性物質１００重量部に対して、拡散材が０．
０１重量部以下では効果がなく、又、５重量部以上にす
ると、これ以上効果が大きくならず、寧ろ、光の透過性
能が悪くなるので、０．０１〜５重量部が好ましく、特
に０．１〜５重量部が好ましい。The content of the diffusing material is 0. 0 with respect to 100 parts by weight of the light-transmitting substance such as glass or synthetic resin.
If the amount is 01 parts by weight or less, no effect is obtained, and if the amount is 5 parts by weight or more, the effect is not further increased and the light transmission performance is deteriorated. Therefore, 0.01 to 5 parts by weight is preferable, and particularly 0. 1 to 5 parts by weight is preferable.
【００２３】[0023]
【作用】本発明面光源装置用フィルム又はシートは正弦
曲面からなる凹凸条が設けられている面を光が出る面、
即ち、表面にして使用する。すると、この正弦曲面を透
って出る光は正弦曲面で屈折して、この面光源装置用フ
ィルム又はシートと法線方向、即ち、正面方向に収斂す
る。例えば、エッヂライト方式の面光源装置に使用する
場合には、導光板の表面に面光源装置用フィルム又はシ
ートの正弦曲面と反対側の面を当接させて使用する。す
ると、導光板の表面から小さい角度で出光する光を、こ
の面光源装置用フィルム又はシートを透すことにより正
面方向に収斂させて出光させることができる。The film or sheet for a surface light source device of the present invention has a surface on which light is emitted from a surface provided with an uneven line formed of a sinusoidal curved surface,
That is, it is used as a surface. Then, the light emitted through the sine-curved surface is refracted by the sine-curved surface and converges with the film or sheet for the surface light source device in the normal direction, that is, the front direction. For example, when used in an edge light type surface light source device, the surface opposite to the sinusoidal curved surface of the surface light source device film or sheet is used in contact with the surface of the light guide plate. Then, the light emitted from the surface of the light guide plate at a small angle can be converged and emitted in the front direction through the film or sheet for the surface light source device.
【００２４】又、図１２に示す拡散板の裏側に光源を設
けた面光源装置に使用する場合には、この面光源装置用
フィルム又はシートを拡散板として使用したり、又、拡
散板の表面に取り付けて使用する。すると、この本発明
面光源装置用フィルム又はシートを透った光は、光の広
がる角度が小さくなり、正面方向に多く出光するように
なる。即ち、使用者が見る方向に光が多くなり、明るく
見易くなる。この本発明面光源装置用フィルム又はシー
トを、エッヂライト方式の面光源装置に取り付けた例を
挙げて更に詳細に説明すると、エッヂライト方式の面光
源装置では導光板の端面に線状の光源が設けられている
から、この光源から放射された光は端面から導光板の中
に入る。When used in a surface light source device having a light source provided on the back side of the diffusion plate shown in FIG. 12, the film or sheet for the surface light source device may be used as the diffusion plate or the surface of the diffusion plate. Attach it to and use it. Then, the light transmitted through the film or sheet for a surface light source device of the present invention has a small spread angle and is emitted in a large amount in the front direction. That is, the amount of light is increased in the direction viewed by the user, and the image becomes brighter and easier to see. This film or sheet for a surface light source device of the present invention will be described in more detail with reference to an example in which it is attached to an edge light type surface light source device. In the edge light type surface light source device, a linear light source is provided on the end surface of the light guide plate. Since it is provided, the light emitted from this light source enters the light guide plate from the end face.
【００２５】そして、この導光板に入った光は導光板の
裏面に設けられた乱反射層で乱反射され、直接表面から
出るか、この導光板の裏面に設けられている反射板で反
射されて表面に出る。この導光板から出た光は図８に示
すように極めて方向性が強い。この導光板の表面には、
本発明面光源装置用フィルム又はシートが設けられてい
るから、光はこの面光源装置用フィルム又はシートに入
る。。The light entering the light guide plate is diffusely reflected by the diffuse reflection layer provided on the back surface of the light guide plate and directly emitted from the front surface or reflected by the reflection plate provided on the back surface of the light guide plate to the surface. Go to. The light emitted from this light guide plate is extremely directional as shown in FIG. On the surface of this light guide plate,
Since the surface light source device film or sheet of the present invention is provided, light enters the surface light source device film or sheet. .
【００２６】この際、この面光源装置用フィルム又はシ
ートの正弦曲面と反対側の面、即ち、導光板に当接する
面に微細な凹凸が設けられていると、この面が導光板に
密着しないから、密着による微細な隙間の結果生ずるニ
ュートンリング状の干渉縞が現れることがない。又、断
面三角形状の凹凸条が設けられていると、導光板から出
た方向性の強い光が、この断面三角形状の面で屈折され
て、図１１に示すように、使用者が見る方向、即ち、正
面方向に変えられるし、導光板と密着しなくなり、微細
な凹凸と同様に、ニュートンリング状の干渉縞が生じる
なくなる。又、この反対側の凹凸条を正弦曲面の凹凸条
の周期とほぼ等しく、且つ、振幅幅が１／２以下にする
と更に見易くなる。At this time, if fine irregularities are provided on the surface of the surface light source device film or sheet opposite to the sinusoidal curved surface, that is, the surface contacting the light guide plate, this surface does not adhere to the light guide plate. Therefore, the Newton's ring-shaped interference fringes resulting from the minute gap due to the close contact do not appear. Further, when the uneven strip having a triangular cross section is provided, the light having a strong directionality emitted from the light guide plate is refracted by the surface having the triangular cross section, and as shown in FIG. That is, it can be changed to the front direction, and the light guide plate does not come into close contact with the light guide plate, so that Newton-ring-shaped interference fringes are not generated as in the case of fine unevenness. Further, when the concavo-convex line on the opposite side is substantially equal to the period of the concavo-convex line of the sinusoidal curved surface and the amplitude width is 1/2 or less, it becomes easier to see.
【００２７】次に、光はこの面光源装置用フィルム又は
シートを透って、正弦曲面からなる表面から出光する。
この際、光は、この正弦曲面で正面方向に収斂され、導
光板の裏面に設けられているドット印刷等の乱反射層が
見えなり、使用者が見易い光となって出てくる。尚、こ
の透光性フィルム又はシートの中に拡散材が混入されて
いると、光が適当に分散されて更に見易い光となる。Next, the light passes through the film or sheet for the surface light source device and emerges from the surface having a sinusoidal curved surface.
At this time, the light is converged in the front direction by the sinusoidal curved surface, and the irregular reflection layer such as dot printing provided on the back surface of the light guide plate becomes invisible, so that the light is easy for the user to see. Incidentally, if a diffusing material is mixed in this light-transmitting film or sheet, the light is appropriately dispersed to make it easier to see.
【００２８】又、この面光源装置用フィルム又はシート
の前に液晶を用いた表示装置を取り付けても、面光源装
置用フィルム又はシートの面に設けられている正弦曲面
からなる凹凸条のために、表示装置と密着することがな
く、従って、ニュートンリング状の干渉縞が現れること
がない。Even if a display device using liquid crystal is attached in front of the film or sheet for surface light source device, because of the concave-convex line formed on the surface of the film or sheet for surface light source device and having a sinusoidal curved surface. However, it does not come into close contact with the display device, and therefore, Newton's ring-shaped interference fringes do not appear.
【００２９】[0029]
【実施例】次に、本発明の実施例を説明する。図１〜２
は本発明面光源装置用フィルム又はシートをエッヂライ
ト方式の面光源装置に取り付けたときの一実施例を示す
もので、図１は面光源装置用フィルム又はシートの一部
を示す断面図、図２は図１に示す面光源装置用フィルム
又はシートをエッヂライト方式の面光源装置に使用した
状態を示す説明図である。図３は本発明の他の実施例を
示すもので、面光源装置用フィルム又はシートの一部を
示す断面図である。EXAMPLES Next, examples of the present invention will be described. 1-2
1 shows an embodiment in which the film or sheet for a surface light source device of the present invention is attached to an edge light type surface light source device. FIG. 1 is a sectional view showing a part of the film or sheet for a surface light source device. 2 is an explanatory view showing a state where the film or sheet for surface light source device shown in FIG. 1 is used in an edge light type surface light source device. FIG. 3 shows another embodiment of the present invention and is a sectional view showing a part of a film or sheet for a surface light source device.
【００３０】図４は本発明の別の実施例を示すもので、
面光源装置用フィルム又はシートの一部を示す断面図で
ある。図５は本発明の別の実施例を示すもので、面光源
装置用フィルム又はシートの一部を示す断面図である。
図６は本発明の別の実施例を示すもので、面光源装置用
フィルム又はシートの斜視図である。FIG. 4 shows another embodiment of the present invention.
It is sectional drawing which shows some films or sheets for surface light source devices. FIG. 5 shows another embodiment of the present invention and is a sectional view showing a part of a film or sheet for a surface light source device.
FIG. 6 shows another embodiment of the present invention and is a perspective view of a film or sheet for a surface light source device.
【００３１】図１〜２において、１は厚み３ｍｍのポリ
メチルメタクリル板からなる導光板であり、この導光板
１の裏面にはドット印刷された乱反射層が設けられてい
る。尚、このドット印刷に使用したビーズの粒径は０．
５ｍｍ〜１．５ｍｍである。２は反射板であり、この反
射板２は導光板１の裏面に設けられて、導光板１の裏面
に出光した光を反射させて、導光板１に戻すものであ
る。In FIGS. 1 and 2, reference numeral 1 denotes a light guide plate made of a polymethylmethacrylate plate having a thickness of 3 mm, and a dot reflection irregular reflection layer is provided on the back surface of the light guide plate 1. The particle size of the beads used for this dot printing was 0.
It is 5 mm to 1.5 mm. Reference numeral 2 denotes a reflection plate, which is provided on the back surface of the light guide plate 1 to reflect the light emitted to the back surface of the light guide plate 1 and return it to the light guide plate 1.
【００３２】３は透光性シートからなるポリカーボネー
ト製の面光源装置用シートであり、この面光源装置用シ
ート３はポリカーボネートをプレス加工方法で一面に振
幅１２０μｍ、ピッチ３５０μｍの正弦曲面を有する厚
み２００μｍのシートを成形し、このシートの反対側の
面をサンドブラスト法で微細な凹凸を設けたものであ
る。この面光源装置用シート３は導光板１に微細な凹凸
を設けた面を当接させて使用する。Reference numeral 3 denotes a polycarbonate sheet made of a translucent sheet for a surface light source device. The sheet 3 for a surface light source device has a thickness of 200 μm having a sine curved surface having an amplitude of 120 μm and a pitch of 350 μm on one surface by a press working method. Is formed, and the surface on the opposite side of this sheet is provided with fine irregularities by the sandblast method. The surface light source device sheet 3 is used by abutting the light guide plate 1 with a surface provided with fine irregularities.
【００３３】５は導光板１の端面に設けられた線状の光
源である。６は反射カバーであり、この反射カバー６は
光源５の背後に取り付けられ、光源５から放射された光
を導光板１に効率よく入光させるものである。Reference numeral 5 is a linear light source provided on the end face of the light guide plate 1. Reference numeral 6 denotes a reflection cover, which is attached to the back of the light source 5 so as to allow the light emitted from the light source 5 to efficiently enter the light guide plate 1.
【００３４】次に、この図１〜２に示す面光源装置用シ
ートの使用方法について説明する。光源５を点灯する。
すると、この光源５から放射された光は直接または反射
カバー６で反射されて、導光板１の中に入る。Next, a method of using the sheet for surface light source device shown in FIGS. 1 and 2 will be described. The light source 5 is turned on.
Then, the light emitted from the light source 5 enters the light guide plate 1 directly or is reflected by the reflection cover 6.
【００３５】この導光板１に入った光は直接または反射
板２から反射されて、表面から図７に示すように指向性
（導光板との角度が約２０°）の強い光が出る。この表
面から出た光は面光源装置用シート３の中に入る。この
際、光が入る面には微細な凹凸が設けられているから、
光は拡散されて入る。The light entering the light guide plate 1 is reflected directly or from the reflection plate 2, and strong light having directivity (angle with the light guide plate is about 20 °) is emitted from the surface as shown in FIG. The light emitted from this surface enters the surface light source device sheet 3. At this time, since the surface on which the light enters has fine irregularities,
Light is diffused and enters.
【００３６】次にこの入った光は面光源装置用シート３
の中を透り、表面から出る。光が表面から出るときに、
表面の正弦曲面により、正面方向に変えられて出光す
る。この面光源装置用シート３を通った光の配光特性を
調べた結果、図７のＥに示すように極めて良好な分布と
なっていた。又、この透光性シート３を覗いたところ導
光板１の裏面に設けられた乱反射層が見えなかった。
又、この面光源装置の前に液晶を用いた表示装置を置い
たところ、乱反射層に起因する見難さもなく、極めて美
麗な画面となった。Next, the entered light is used as the surface light source device sheet 3
It goes through the inside and goes out from the surface. When the light comes out of the surface,
Due to the sinusoidal surface, the light is changed to the front direction. As a result of examining the light distribution characteristics of the light passing through the sheet 3 for surface light source device, it was found that the distribution was extremely good as shown by E in FIG. Further, when the transparent sheet 3 was looked into, the irregular reflection layer provided on the back surface of the light guide plate 1 could not be seen.
Further, when a display device using liquid crystal was placed in front of this surface light source device, there was no difficulty in viewing due to the irregular reflection layer, and an extremely beautiful screen was obtained.
【００３７】次に、図３に示す実施例について説明す
る。この図３に示す実施例の面光源装置用シート３ａは
一面に正弦曲面を設け、更にこの正弦曲面と反対側の面
にも同じく正弦曲面の凹凸条を設けたものである。但
し、正弦曲面のピッチは４００μｍ、振幅２００μｍで
ある。又、この反対側の正弦曲面はピッチが４００μｍ
で同じであるが、振幅が２０μｍである。又、この面光
源装置用シートの厚みは５００μｍである。Next, the embodiment shown in FIG. 3 will be described. The sheet 3a for surface light source device of the embodiment shown in FIG. 3 is provided with a sinusoidal curved surface on one surface, and is also provided with an uneven strip having a sinusoidal curved surface on the surface opposite to the sinusoidal curved surface. However, the sine curved surface has a pitch of 400 μm and an amplitude of 200 μm. The pitch of the sine curved surface on the opposite side is 400 μm.
However, the amplitude is 20 μm. The thickness of the surface light source device sheet is 500 μm.
【００３８】この面光源装置用シートはメチルメタクリ
ル樹脂を押出機でシート状に押し出し、このシートをエ
ンボスロールで凹凸模様付けを行って製造した。この図
３に示す面光源装置用シート３ａを図１〜２に示す実施
例と同じ面光源装置に取り付けて配光特性を調べた結
果、図７のＥに示す配光特性と若干異なったが、極めて
良好な分布となっていた。この面光源装置の前に液晶を
用いた表示装置を置いたところ、導光板の表面と面光源
装置用シート３ａ正弦曲面とが密着せず、従って、この
密着に起因するニュートンリング状の干渉縞が生ぜず、
又、反対側の凹凸条による光が正面方向に収斂されて、
図１〜２に示す実施例の面光源装置より更に美麗な画面
となった。This sheet for surface light source device was manufactured by extruding a methyl methacrylic resin into a sheet shape with an extruder and forming an uneven pattern on this sheet with an embossing roll. The sheet 3a for surface light source device shown in FIG. 3 was attached to the same surface light source device as that of the embodiment shown in FIGS. 1 and 2, and the light distribution characteristics were examined. As a result, the light distribution characteristics slightly differ from those shown in E of FIG. The distribution was extremely good. When a display device using a liquid crystal is placed in front of this surface light source device, the surface of the light guide plate and the sinusoidal curved surface of the surface light source device sheet 3 do not come into close contact with each other. Does not occur,
Also, the light from the uneven strip on the opposite side is converged in the front direction,
The screen was more beautiful than that of the surface light source device of the embodiment shown in FIGS.
【００３９】次に、図４に示す実施例について説明す
る。この図４に示す実施例では、面光源装置用シート３
ｂの正弦曲面と反対側の面に断面三角状の凹凸条を設け
た。但し、この反対側の正弦曲面はピッチが３５０μｍ
で同じであるが、振幅幅は５０μｍである。その他は図
１〜２に示す実施例と同じ構造である。Next, the embodiment shown in FIG. 4 will be described. In the embodiment shown in FIG. 4, the surface light source device sheet 3 is used.
An uneven strip having a triangular cross section was provided on the surface opposite to the sinusoidal curved surface of b. However, the sine curved surface on the opposite side has a pitch of 350 μm.
However, the amplitude width is 50 μm. The other structure is the same as that of the embodiment shown in FIGS.
【００４０】この図４に示す実施例の面光源装置用シー
トを図１〜２の実施例に使用した面光源装置に取り付
け、この面光源装置の前に液晶を用いた表示装置を置い
たところ、導光板と面光源装置用シート３ｂの断面三角
状の凹凸条の面とが密着せず、従って、この密着に起因
するニュートンリング状の干渉縞が生ぜず、又、反対側
の凹凸条によって光が正面に更によく出て、図１〜２に
示す実施例の面光源装置より美麗な画面となった。The sheet for a surface light source device of the embodiment shown in FIG. 4 is attached to the surface light source device used in the embodiments of FIGS. 1 and 2, and a display device using liquid crystal is placed in front of the surface light source device. The light guide plate and the surface of the uneven strip having a triangular cross section of the surface light source device sheet 3b are not in close contact with each other, so that the Newton ring-shaped interference fringes resulting from this close contact are not generated, and the uneven strip on the opposite side causes The light came out to the front better, and the screen was more beautiful than that of the surface light source device of the embodiment shown in FIGS.
【００４１】次に、図５に示す実施例について説明す
る。この図５に示す実施例では、面光源装置用シート３
ｃの中にポリカーボネート１００重量部に対して酸化チ
タン微粉末をを３重量部混入させたことが図１〜２に示
す実施例と異なる。その他は図１〜２に示す実施例と同
じ構造である。この図５に示す実施例の面光源装置用シ
ートを図１〜２に使用した面光源装置に取り付け、この
面光源装置の前に液晶を用いた表示装置を置いたとこ
ろ、酸化チタン微粉末によって光が拡散されて、導光板
の裏面に設けられた乱反射層が見えず図１〜２に示す実
施例の面光源装置より美麗な画面となった。Next, the embodiment shown in FIG. 5 will be described. In the embodiment shown in FIG. 5, the surface light source device sheet 3 is used.
The difference from the examples shown in FIGS. 1 and 2 was that 3 parts by weight of titanium oxide fine powder was mixed in c with 100 parts by weight of polycarbonate. The other structure is the same as that of the embodiment shown in FIGS. The surface light source device sheet of the embodiment shown in FIG. 5 was attached to the surface light source device used in FIGS. 1 and 2, and a display device using liquid crystal was placed in front of the surface light source device. Since the light was diffused, the irregular reflection layer provided on the back surface of the light guide plate was not visible, and the screen was more beautiful than the surface light source device of the embodiment shown in FIGS.
【００４２】次に、図６に示す実施例について説明す
る。図６に示す実施例の面光源装置用シート３ｄは、正
弦曲面と反対側の面が平面となっていることが図１〜２
に示す実施例と異なる。その他は図１〜２に示す実施例
と同じである。この図６に示す実施例の面光源装置用シ
ート３ｄを図１２に示す面光源装置に取り付け、この前
に液晶を用いた表示装置を置いたところ、従来より明る
い美麗な画面となった。Next, the embodiment shown in FIG. 6 will be described. The surface light source device sheet 3d of the embodiment shown in FIG. 6 has a flat surface on the side opposite to the sinusoidal curved surface.
Different from the embodiment shown in FIG. Others are the same as the embodiment shown in FIGS. When the sheet 3d for surface light source device of the embodiment shown in FIG. 6 was attached to the surface light source device shown in FIG. 12 and a display device using liquid crystal was placed in front of it, a beautiful screen brighter than before was obtained.
【００４３】次に、従来の面光源装置用フィルム又はシ
ートと本発明面光源装置用フィルム又はシートの性能を
比較するために、次の試験を行った。 （比較試験）試料として、図１に示す面光源装置用シー
ト（試料１）と図３に示す面光源装置用シート（試料
２）を用いた。一方、この比較試料として、ポリカーボ
ネートを押出機を用い押し出したシートの一面に無秩序
な深さ１５０μｍの凹凸を設け、反対側の面にサンドブ
ラスト法で微細な凹凸を設けた。この際の面光源装置用
フィルムの厚みは２００μｍである。（比較試料１）Next, the following tests were conducted in order to compare the performance of the conventional film or sheet for surface light source device and the film or sheet for surface light source device of the present invention. (Comparative Test) As a sample, the surface light source device sheet (sample 1) shown in FIG. 1 and the surface light source device sheet (sample 2) shown in FIG. 3 were used. On the other hand, as this comparative sample, one surface of a sheet obtained by extruding polycarbonate using an extruder was provided with random irregularities having a depth of 150 μm, and the opposite surface was provided with fine irregularities by a sandblast method. The thickness of the film for surface light source device at this time is 200 μm. (Comparative sample 1)
【００４４】又、透明ポリカーボネートを用い、図１０
に示すように、一面に断面三角形状の凹凸条を設けた面
光源装置用シートをプレス成形法により製造した。この
際の断面三角形状の凹凸条の頂角は９０°、傾斜面の角
度は４５°、ピッチ３００μｍ、であり、厚みは５００
μｍである。（比較試料２） 以上４個の試料を図２に示す面光源装置に取り付けて、
正面輝度（ｃｄ／ｍ2）、角度範囲（ｄｅｇ）、発光外
観品位を測定した。試験結果を表１に示す。Also, using transparent polycarbonate, as shown in FIG.
As shown in, a sheet for a surface light source device having an uneven line having a triangular cross section on one surface was manufactured by a press molding method. At this time, the apex angle of the uneven strip having a triangular cross section was 90 °, the angle of the inclined surface was 45 °, the pitch was 300 μm, and the thickness was 500.
μm. (Comparative Sample 2) The above four samples were attached to the surface light source device shown in FIG.
The front luminance (cd / m 2 ), the angle range (deg), and the emission appearance quality were measured. The test results are shown in Table 1.
【００４５】[0045]
【表１】 [Table 1]
【００４６】この表１から判るように、試料１及び２に
示される本発明面光源装置用シートは正面輝度が大き
く、しかも、角度範囲も適当に拡散され、発光外観品位
もよく、極めて優れた面光源装置用フィルム又はシート
である。一方、比較試料１は角度が大きく、正面輝度が
小さい。このことから、使用者が見る方向に効率よく出
光されず、この前に表示装置を置いても暗い画面となる
ことが判る。又、比較試料２は正面輝度は極めて大きい
が角度範囲が小さいから、この前に表示装置を置くと、
正面からは極めて明るてよいが、少し方向を変えただけ
で暗くなり、見難い画面となることが判る。As can be seen from Table 1, the sheet for surface light source device of the present invention shown in Samples 1 and 2 has a large frontal luminance, the angle range is appropriately diffused, and the luminescent appearance quality is good, which is very excellent. A film or sheet for a surface light source device. On the other hand, Comparative Sample 1 has a large angle and a small front luminance. From this, it is understood that the user does not efficiently emit light in the viewing direction, and even if the display device is placed in front of this, a dark screen is obtained. Further, the comparative sample 2 has a very large front luminance but a small angular range, so if a display device is placed in front of this,
It can be extremely bright from the front, but it turns out to be dark with a slight change in direction, making it difficult to see.
【００４７】[0047]
【発明の効果】本発明面光源装置用フィルム又はシート
は一面に正弦曲面からなる凹凸条が設けられているか
ら、この正弦曲面を透る光が正面方向に収斂して、極め
て見易い光となって出る。従って、この面光源装置用フ
ィルム又はシートをエッヂライト方式の面光源装置に使
用したり、あるいは、光源が拡散板の裏に設けられてい
る面光源装置に使用し、液晶を用いた表示装置に取り付
けると、明るく極めて見易い画面が得られる。Since the film or sheet for a surface light source device of the present invention is provided with an uneven strip having a sinusoidal curved surface on one surface, light passing through this sinusoidal curved surface is converged in the front direction and becomes extremely easy to see. Come out. Therefore, this film or sheet for a surface light source device is used in an edge light type surface light source device, or is used in a surface light source device in which a light source is provided on the back of a diffusion plate, and is used as a display device using liquid crystal. When installed, it provides a bright and extremely easy-to-see screen.
【００４８】更に、本発明面光源装置用フィルム又はシ
ートは液晶を用いた表示装置だけに止まらず、店舗、家
屋、事務所等の厚みが薄い施設照明の薄型面光源装置に
使用しても効果的である。又、本発明において、この正
弦曲面の反対側の面を、微細な凹凸を設けたり、正弦曲
面にしたり、断面三角形状にすると、それぞれ、特異な
効果が現れるので極めて便利である。Further, the film or sheet for a surface light source device of the present invention is not limited to a display device using liquid crystal, and is also effective when used for a thin surface light source device for facility lighting such as a store, a house, or an office where the thickness is thin. Target. Further, in the present invention, it is very convenient to provide the surface on the opposite side of the sinusoidal curved surface with fine irregularities, a sinusoidal curved surface, or a triangular cross-section, because each has a unique effect.
【００４９】又、この面光源装置用フィルム又はシート
の中に拡散材を混入すると、光が拡散されるので更によ
くなる。このように本発明面光源装置用フィルム又はシ
ートは以上の如く種々な効果があるから価値あるもので
ある。Further, if a diffusing material is mixed into the film or sheet for the surface light source device, the light is diffused, which is further improved. As described above, the film or sheet for a surface light source device of the present invention is valuable because it has various effects as described above.
【図１】図１は本発明面光源装置用フィルム又はシート
をエッヂライト方式の面光源装置に使用したときの一実
施例を示すもので、面光源装置用フィルム又はシートの
一部を示す断面図である。FIG. 1 shows an embodiment in which the film or sheet for a surface light source device of the present invention is used in an edge light type surface light source device, and a cross section showing a part of the film or sheet for a surface light source device. It is a figure.
【図２】図２は図１に示す面光源装置用フィルムまたは
シートをエッヂライト方式の面光源装置に使用した状態
を示す説明図である。FIG. 2 is an explanatory view showing a state in which the film or sheet for surface light source device shown in FIG. 1 is used in an edge light type surface light source device.
【図３】図３は本発明の他の実施例を示すもので、面光
源装置用フィルム又はシートの一部を示す断面図であ
る。FIG. 3 shows another embodiment of the present invention and is a sectional view showing a part of a film or sheet for a surface light source device.
【図４】図４は本発明の別の実施例を示すもので、面光
源装置用フィルム又はシートの一部を示す断面図であ
る。FIG. 4 shows another embodiment of the present invention and is a sectional view showing a part of a film or sheet for a surface light source device.
【図５】図５は本発明の別の実施例を示すもので、面光
源装置用フィルム又はシートの一部を示す断面図であ
る。FIG. 5 shows another embodiment of the present invention and is a cross-sectional view showing a part of a film or sheet for a surface light source device.
【図６】図６は本発明の別の実施例を示すもので、面光
源装置用フィルム又はシートの斜視図である。FIG. 6 shows another embodiment of the present invention and is a perspective view of a film or sheet for a surface light source device.
【図７】図７は従来の面光源装置の配光特性を示す説明
図である。FIG. 7 is an explanatory diagram showing a light distribution characteristic of a conventional surface light source device.
【図８】図８は従来の面光源装置の配光特性を示す説明
図である。FIG. 8 is an explanatory diagram showing a light distribution characteristic of a conventional surface light source device.
【図９】図９は従来の面光源装置の配光特性を示す説明
図である。FIG. 9 is an explanatory diagram showing a light distribution characteristic of a conventional surface light source device.
【図１０】図１０は従来の面光源装置用フィルム又はシ
ートを示す斜視図である。FIG. 10 is a perspective view showing a conventional film or sheet for a surface light source device.
【図１１】図１１は従来の面光源装置の配光特性を示す
説明図である。FIG. 11 is an explanatory diagram showing a light distribution characteristic of a conventional surface light source device.
【図１２】図１２は従来の面光源装置を示す説明図であ
る。FIG. 12 is an explanatory diagram showing a conventional surface light source device.
１ 導光板 ２ 反射板 ３、３ａ、３ｂ、３ｃ、３ｄ 面光源装置用フィルムま
たはシート ５ 光源 ６ 反射カバーDESCRIPTION OF SYMBOLS 1 Light guide plate 2 Reflector 3, 3a, 3b, 3c, 3d Film or sheet for surface light source device 5 Light source 6 Reflective cover
Claims (6)
条が設けられていて、この凹凸条は凹凸条を横切る断面
形状が、Ｙ＝ａ・ｓｉｎｂＸ（Ｙ：厚み方向の座標・単
位ｍｍ、Ｘ：凹凸条を横切る方向の座標・単位ｍｍ、ａ
およびｂ：係数）で表される正弦曲面になされているこ
とを特徴とする面光源装置用フィルム又はシート。1. A translucent film or sheet is provided with an uneven line on one surface, and the uneven line has a cross-sectional shape crossing the uneven line of Y = a.sinbX (Y: coordinate in thickness direction, unit mm, X: Coordinates in the direction crossing the uneven strip, unit: mm, a
And a sinusoidal curved surface represented by b: coefficient), the film or sheet for a surface light source device.
曲面からなる凹凸条が設けられ、更に、この反対側の面
に微細な凹凸が設けられていることを特徴とする請求項
１記載の面光源装置用フィルム又はシート。2. The light-transmissive film or sheet is provided with an uneven line formed of a sinusoidal curved surface on one surface thereof, and further provided with fine unevenness on the opposite surface thereof. Film or sheet for surface light source device.
弦曲面からなる凹凸条が設けられ、この反対側の面にも
凹凸条が設けられていて、この反対側の凹凸条の周期が
正弦曲面からなる凹凸条の周期とほぼ同じで、振幅が１
／２以下になされていることを特徴とする請求項１記載
の光源装置用フィルム又はシート。3. A translucent film or sheet is provided with an uneven strip formed on one surface of a sinusoidal curved surface, and an uneven strip is also provided on the opposite surface thereof, and the cycle of the uneven strip on the opposite side is a sinusoidal curved surface. Is almost the same as the cycle of the ridges and valleys consisting of
The film or sheet for a light source device according to claim 1, wherein the film or sheet has a thickness of 1/2 or less.
００５〜１の範囲であり、透光性フィルムまたはシート
の平均厚みが０．０１ｍｍ〜３ｍｍの範囲であることを
特徴とする請求項１〜３記載の面光源装置用フィルム又
はシート。4. In the formula, a is 200 to 20000 and b is 0.
The film or sheet for a surface light source device according to claim 1, wherein the light-transmissive film or sheet has an average thickness of 0.01 mm to 3 mm.
弦曲面からなる凹凸条が設けられ、この反対側の面に断
面三角形状の凹凸条が設けられていることを特徴とする
請求項３記載の面光源装置用フィルム又はシート。5. The uneven line formed of a sinusoidal curved surface is provided on one surface of the translucent film or sheet, and the uneven line having a triangular cross section is provided on the opposite surface. Film or sheet for surface light source device.
が含有されていることを特徴とする請求項１〜３記載の
面光源装置用フィルム又はシート。6. The film or sheet for surface light source device according to claim 1, wherein the transparent film or sheet contains a diffusing material.
Priority Applications (9)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4199576A JPH0643310A (en) | 1992-07-27 | 1992-07-27 | Film or sheet for surface light source device |
| CA002244439A CA2244439C (en) | 1992-01-27 | 1993-01-26 | Light adjusting sheet having a sinusoidal surface and a non-optically flat surface and usable with an lcd |
| US08/008,995 US5394255A (en) | 1992-01-27 | 1993-01-26 | Liquid crystal display using a plurality of light adjusting sheets angled at 5 degrees or more |
| CA002088113A CA2088113C (en) | 1992-01-27 | 1993-01-26 | Light adjusting sheet for a planar lighting device and a planar lighting device and a liquid crystal display using the sheet |
| DE69317133T DE69317133T2 (en) | 1992-01-27 | 1993-01-27 | Flat lighting unit and an LCD display device with this unit |
| EP93101206A EP0556606B1 (en) | 1992-01-27 | 1993-01-27 | Planar lighting device and a liquid crystal display comprising this device |
| TW082100702A TW271472B (en) | 1992-01-27 | 1993-02-03 | |
| US08/301,412 US5552907A (en) | 1992-01-27 | 1994-09-08 | Light adjusting sheet having a sinusoidal surface and a non-optically flat surface and useable with an LCD |
| US08/650,758 US5764315A (en) | 1992-01-27 | 1996-05-20 | Light adjusting sheet for a planar lighting device and a planar lighting device and a liquid crystal display using the sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4199576A JPH0643310A (en) | 1992-07-27 | 1992-07-27 | Film or sheet for surface light source device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0643310A true JPH0643310A (en) | 1994-02-18 |
Family
ID=16410137
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4199576A Pending JPH0643310A (en) | 1992-01-27 | 1992-07-27 | Film or sheet for surface light source device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0643310A (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002214411A (en) * | 2001-01-19 | 2002-07-31 | Fujitsu Ltd | Optical sheet, illuminator and optical member |
| KR100456805B1 (en) * | 2001-02-08 | 2004-11-10 | 다이니폰 인사츠 가부시키가이샤 | Light diffusing protective film and method for thereof |
| US6862141B2 (en) | 2002-05-20 | 2005-03-01 | General Electric Company | Optical substrate and method of making |
| US7180672B2 (en) | 2002-05-20 | 2007-02-20 | General Electric Company | Optical substrate and method of making |
| US7248412B2 (en) | 2003-12-31 | 2007-07-24 | General Electric Company | Optical substrate with modulated structure |
| JP2008225228A (en) * | 2007-03-14 | 2008-09-25 | Toppan Printing Co Ltd | Optical sheet and backlight unit and display using the same |
| JP2009163138A (en) * | 2008-01-09 | 2009-07-23 | Ind Technol Res Inst | Light diffusion module |
| EP2204723A3 (en) * | 2002-10-16 | 2010-07-21 | Alps Electric Co., Ltd. | Transparent coordinate input device |
| US7859759B2 (en) | 2002-05-20 | 2010-12-28 | Sabic Innovative Plastics Ip B.V. | Film, backlight displays, and methods for making the same |
| US7911700B2 (en) | 2007-10-04 | 2011-03-22 | Industrial Technology Research Institute | Light guiding film |
| US8460585B2 (en) | 2006-08-30 | 2013-06-11 | Industrial Technology Research Institute | Method of forming an optical diffusion module |
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|---|---|---|---|---|
| JPS58117502A (en) * | 1981-12-30 | 1983-07-13 | Nitto Electric Ind Co Ltd | Light reflecting material |
| JPH03142401A (en) * | 1989-10-30 | 1991-06-18 | Asahi Chem Ind Co Ltd | Synthetic resin layer, light transmission and diffusion plate and production thereof |
| JPH0491905A (en) * | 1990-08-07 | 1992-03-25 | Asahi Chem Ind Co Ltd | Template made of synthetic resin |
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1992
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58117502A (en) * | 1981-12-30 | 1983-07-13 | Nitto Electric Ind Co Ltd | Light reflecting material |
| JPH03142401A (en) * | 1989-10-30 | 1991-06-18 | Asahi Chem Ind Co Ltd | Synthetic resin layer, light transmission and diffusion plate and production thereof |
| JPH0491905A (en) * | 1990-08-07 | 1992-03-25 | Asahi Chem Ind Co Ltd | Template made of synthetic resin |
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| JP2002214411A (en) * | 2001-01-19 | 2002-07-31 | Fujitsu Ltd | Optical sheet, illuminator and optical member |
| KR100456805B1 (en) * | 2001-02-08 | 2004-11-10 | 다이니폰 인사츠 가부시키가이샤 | Light diffusing protective film and method for thereof |
| US6862141B2 (en) | 2002-05-20 | 2005-03-01 | General Electric Company | Optical substrate and method of making |
| US7180672B2 (en) | 2002-05-20 | 2007-02-20 | General Electric Company | Optical substrate and method of making |
| US7965447B2 (en) | 2002-05-20 | 2011-06-21 | Sabic Innovative Plastics Ip B.V. | Optical substrate and method of making |
| US7324284B2 (en) | 2002-05-20 | 2008-01-29 | General Electric Company | Optical substrate and method of making |
| US7859759B2 (en) | 2002-05-20 | 2010-12-28 | Sabic Innovative Plastics Ip B.V. | Film, backlight displays, and methods for making the same |
| EP2204723A3 (en) * | 2002-10-16 | 2010-07-21 | Alps Electric Co., Ltd. | Transparent coordinate input device |
| US8054390B2 (en) | 2002-10-16 | 2011-11-08 | Alps Electric Co., Ltd. | Transparent coordinate input device having a ridge portion formed in transparent resistance film |
| US8054392B2 (en) | 2002-10-16 | 2011-11-08 | Alps Electric Co., Ltd. | Transparent composite material having ridge portion formed in transparent resistance film for transparent coordinate input device |
| US7483195B2 (en) | 2003-12-31 | 2009-01-27 | Sabic Innovative Plastics Ip B.V. | Optical substrate with modulated structure |
| US7248412B2 (en) | 2003-12-31 | 2007-07-24 | General Electric Company | Optical substrate with modulated structure |
| US8460585B2 (en) | 2006-08-30 | 2013-06-11 | Industrial Technology Research Institute | Method of forming an optical diffusion module |
| JP2008225228A (en) * | 2007-03-14 | 2008-09-25 | Toppan Printing Co Ltd | Optical sheet and backlight unit and display using the same |
| US7911700B2 (en) | 2007-10-04 | 2011-03-22 | Industrial Technology Research Institute | Light guiding film |
| JP2009163138A (en) * | 2008-01-09 | 2009-07-23 | Ind Technol Res Inst | Light diffusion module |
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