JP3442247B2 - Light guide for surface light source element and surface light source element - Google Patents
Light guide for surface light source element and surface light source elementInfo
- Publication number
- JP3442247B2 JP3442247B2 JP01571797A JP1571797A JP3442247B2 JP 3442247 B2 JP3442247 B2 JP 3442247B2 JP 01571797 A JP01571797 A JP 01571797A JP 1571797 A JP1571797 A JP 1571797A JP 3442247 B2 JP3442247 B2 JP 3442247B2
- Authority
- JP
- Japan
- Prior art keywords
- light
- light guide
- light source
- source element
- guide
- 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.)
- Expired - Lifetime
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Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ノートパソコン、
液晶テレビ等に使用される液晶表示装置、駅や公共施設
等における案内標示板や大型看板、高速道路や一般道路
における交通案内板や交通標識等の標示装置に使用され
る面光源素子およびそれに使用される導光体に関するも
のであり、さらに詳しくは、輝度が高く、光出射面内で
の均一な輝度分布が得られる面光源素子用導光体および
面光源素子に関するものである。TECHNICAL FIELD The present invention relates to a notebook computer,
Surface light source elements used for liquid crystal display devices used for liquid crystal televisions, guide signs and large signboards at stations and public facilities, and traffic light signs and signs for highways and general roads More specifically, the present invention relates to a light guide for a surface light source element and a surface light source element which have high brightness and can obtain a uniform brightness distribution in a light emitting surface.
【０００２】[0002]
【従来の技術】従来、液晶表示装置、看板、交通案内板
等に使用されている背面光源装置としては、ハウジング
内に蛍光灯等の線状光源を複数本設置した直下方式、板
状の導光体の側端面に線状光源を配置したエッジライト
方式がある。直下方式の背面光源装置では、光源部の軽
量化や薄型化を図ることが困難であるとともに、光源と
して使用する蛍光灯等が標示板から透けて見えるシース
ルー現象が起こりやすいという問題点を有していた。軽
量で薄型の背面光源装置としてエッジライト方式のもの
が多用されてきている。2. Description of the Related Art Conventionally, as a back light source device used for a liquid crystal display device, a signboard, a traffic guide plate, etc., a direct type, a plate type light guide device having a plurality of linear light sources such as fluorescent lamps installed in a housing. There is an edge light system in which a linear light source is arranged on a side end surface of a light body. The direct-type rear light source device has a problem in that it is difficult to reduce the weight and thickness of the light source unit, and a see-through phenomenon that a fluorescent lamp used as a light source can be seen through the signboard easily occurs. Was there. An edge light type light source has been widely used as a light and thin back light source device.
【０００３】このようなエッジライト方式の背面光源装
置は、通常、アクリル樹脂板等の板状透明材料を導光体
とし、その側端面に面して配置された光源からの光を側
端面（光入射面）から導光体中に入射させ、入射した光
を導光体の表面（光出射面）あるいは裏面に形成した光
散乱部等の光出射機能を設けることにより、光出射面か
ら面状に出射させる面光源素子である。しかし、導光体
の表面あるいは裏面に光出射機能を均一に形成したもの
では、光源から離れるに従って出射光の輝度が低下し
て、光出射面内における輝度が不均一となり、良好な表
示画面が得られないものであった。このような傾向は、
面光源素子の大型化に伴って顕著となり、１０インチ以
上の面光源素子においては実用に耐えうるものではなか
った。特に、ノートパソコンや液晶テレビ等に使用され
る液晶表示装置においては、その画面内での輝度分布は
非常に高い均一性が要求されるものである。Such an edge light type rear light source device normally uses a plate-shaped transparent material such as an acrylic resin plate as a light guide and guides light from a light source arranged facing the side end face to the side end face ( Light is incident on the light guide surface from the light incident surface), and the incident light is provided on the front surface (light emission surface) or the back surface of the light guide by a light emitting function such as a light scattering portion. It is a surface light source element that emits light in a uniform manner. However, in the case where the light emitting function is uniformly formed on the front surface or the back surface of the light guide, the brightness of the emitted light decreases as the distance from the light source increases, and the brightness on the light emitting surface becomes uneven, resulting in a good display screen. I couldn't get it. Such a tendency is
This becomes remarkable as the surface light source element becomes larger, and the surface light source element having a size of 10 inches or more cannot be practically used. In particular, in a liquid crystal display device used for a notebook personal computer, a liquid crystal television, etc., it is required that the brightness distribution within the screen has a very high uniformity.
【０００４】このような面光源素子の輝度の不均一とい
う課題を解決するために、種々の提案がなされている。
例えば、特開平１−２４５２２号公報には、導光体の光
出射面に対向する裏面に光入射面から離れるに従って光
拡散物質を密に塗布または付着させた光出射機能を設け
た面光源素子が提案されている。また、特開平１−１０
７４０６号公報には、表面に光散乱物質からなる細かい
斑点を種々のパターンで形成した複数の透明板を積層し
て導光体としたものが提案されている。このような面光
源素子においては、光散乱物質として酸化チタンや硫酸
バリウム等の白色顔料を使用しているため、光散乱物質
に当たった光が散乱する際に光吸収等の光のロスが生
じ、所望方向の出射光の輝度の低下を招くため好ましく
ないものであった。Various proposals have been made to solve the problem of non-uniform brightness of the surface light source element.
For example, in Japanese Unexamined Patent Publication No. 1-25222, a surface light source element provided with a light emitting function in which a light diffusing substance is densely applied or adhered to a back surface of a light guide opposite to a light emitting surface as the distance from the light incident surface increases. Is proposed. Moreover, JP-A-1-10
Japanese Patent Publication No. 7406 proposes a light guide body by laminating a plurality of transparent plates on the surface of which fine spots made of a light scattering material are formed in various patterns. In such a surface light source element, since a white pigment such as titanium oxide or barium sulfate is used as the light scattering material, light loss such as light absorption occurs when the light hitting the light scattering material is scattered. However, this is not preferable because it causes a decrease in the brightness of the emitted light in the desired direction.
【０００５】また、特開平１−２４４４９０号公報や特
開平１−２５２９３３号公報には、導光体の光出射面上
に出射光分布の逆数に見合う光反射パターンを有する出
射光調整部材や光拡散板を配置した面光源素子が提案さ
れている。しかし、このような面光源素子においても、
出射光調整部材や光拡散板で反射した光の再利用ができ
ないために光のロスが生じ、所望方向の出射光の輝度の
低下を招くものであった。さらに、特開平２−８４６１
８号公報には、導光体の光出射面およびその裏面の少な
くとも一方の面を梨地面とし、光出射面上にプリズムシ
ートを載置した面光源素子が提案されている。しかし、
このような面光源素子は、非常に高い輝度が得られるも
のの、光出射面における均一性の点で未だ満足できるも
のではなかった。Further, in JP-A-1-244490 and JP-A-1-252933, an emission light adjusting member or a light having a light reflection pattern corresponding to the reciprocal of the emission light distribution on the light emission surface of the light guide is disclosed. A surface light source element having a diffuser plate has been proposed. However, even in such a surface light source element,
Since the light reflected by the emitted light adjusting member and the light diffusing plate cannot be reused, a loss of light occurs and the brightness of the emitted light in a desired direction is lowered. Furthermore, JP-A-2-8461
Japanese Unexamined Patent Publication No. 8 proposes a surface light source element in which at least one of the light emitting surface and the back surface of the light guide is made a satin-finished surface, and a prism sheet is placed on the light emitting surface. But,
Although such a surface light source element can obtain extremely high brightness, it is still unsatisfactory in terms of uniformity on the light emitting surface.
【０００６】[0006]
【発明が解決しようとする課題】一方、出射光の輝度の
均一化とともに光のロスを低減して輝度を高める面光源
素子については、特開平３−３４５８９３号公報に提案
されているように、導光体の光出射面を梨地面とし、そ
の裏面に粗面部分と平滑部分を粗面部分の割合が光源か
ら離れるに従って増加するように形成するとともに、光
出射面上にプリズムシートを載置した面光源素子が提案
されている。しかしながら、このような面光源素子で
は、出射光の輝度の均一化と光のロスの低減を図れるも
のの、導光体の裏面に形成した粗面部分と平滑部分とで
形成されるパターンが観察され、画像の観察に支障をき
たすものであった。また、導光体の表面に均一光出射機
能を施すことは、導光体の生産性の観点からも好ましい
ものではない。そこで、本発明は、高い輝度を有すると
ともに、斑点パターン等の均一化処理を施すことなく光
出射面内での輝度の高い均一性が得られる導光体および
面光源素子を提供することを目的とする。On the other hand, as for the surface light source element for uniforming the brightness of the emitted light and reducing the loss of the light to increase the brightness, as disclosed in JP-A-3-345893, The light exit surface of the light guide is made to have a matte surface, and the rough surface portion and the smooth portion are formed on the back surface so that the ratio of the rough surface portion increases as the distance from the light source increases, and a prism sheet is placed on the light exit surface. A surface light source element has been proposed. However, in such a surface light source element, although the brightness of the emitted light can be made uniform and the loss of light can be reduced, the pattern formed by the rough surface portion and the smooth portion formed on the back surface of the light guide body is observed. However, this hinders the observation of images. Further, it is not preferable to provide a uniform light emitting function on the surface of the light guide from the viewpoint of productivity of the light guide. Therefore, it is an object of the present invention to provide a light guide and a surface light source element that have high brightness and can obtain high uniformity of brightness in a light exit surface without performing a uniformization process of a spot pattern or the like. And
【０００７】[0007]
【課題を解決させるための手段】すなわち、本発明の面
光源素子用導光体は、板状透明体の少なくとも一つの側
端面を光入射面とし、これと略直交する光出射面とを有
し、光出射面およびその裏面の少なくとも一方の表面に
光出射機能を具備しており、導光体の光出射面からの出
射光の最大光強度を示すピークが法線に対して６５度以
上の角度にあり、出射光の最大光強度を示すピークの方
向と最大光強度の５０％の光強度となる方向がなす角度
が２０度以下であることを特徴とするものである。That is, a light guide for a surface light source element according to the present invention has at least one side end surface of a plate-shaped transparent body as a light incident surface and a light emitting surface substantially orthogonal to the light incident surface. and, on the light emitting surface and at least one surface of the back surface is provided with a light emitting function, exits from the light exit surface of the light guide
The peak showing the maximum light intensity of the incident light is 65 degrees or less with respect to the normal.
It is characterized in that the angle between the peak direction showing the maximum light intensity of the emitted light and the direction having a light intensity of 50% of the maximum light intensity is 20 degrees or less.
【０００８】また、本発明の面光源素子は、光源と、該
光源に対向する少なくとも一つの光入射面およびこれと
略直交する光出射面を有する導光体と、導光体の光出射
面に載置された光変角シートとからなり、該導光体の光
出射面およびその裏面の少なくとも一方の表面に光出射
機能を具備しており、導光体の光出射面からの出射光の
最大光強度を示すピークが法線に対して６５度以上の角
度にあり、出射光の最大光強度を示すピークの方向と最
大光強度の５０％の光強度となる方向がなす角度が２０
度以下であり、該出射光が前記光変角シートにより所望
の方向に変角されていることを特徴とするものである。Further, the surface light source element of the present invention includes a light source, a light guide having at least one light incident surface facing the light source and a light exit surface substantially orthogonal to the light entrance surface, and a light exit surface of the light guide. And a light diverting sheet placed on the light guide surface, and a light emitting function is provided on at least one surface of the light emitting surface and the back surface of the light guiding body. of
The peak showing the maximum light intensity is at an angle of 65 degrees or more to the normal
The angle formed by the direction of the peak indicating the maximum light intensity of the emitted light and the direction of 50% of the maximum light intensity is 20 degrees.
It is less than a degree, and the emitted light is angled in a desired direction by the light angle-changing sheet.
【０００９】[0009]
【発明の実施の形態】本発明の面光源素子は、図１に示
したように、細長い光源２と、この光源２に対向する少
なくとも一つの光入射面およびこれと略直交する光出射
面を有する導光体１と、導光体１の光出射面に載置され
た光変角シート３とから構成される。このような面光源
素子において、光源２から導光体１中に入射した光は、
臨界角を超える分布の光が導光体１の面で全反射を繰り
返して導光体１中を伝搬する。導光体１の表面に凹凸を
形成した場合には、凹凸部分に到達した光のうち凹凸に
対して臨界角以下の光は屈折して導光体１の外へ出射
し、臨界角以を超える光は全反射して導光体１を伝搬す
る。これは、光の進行方向が、スネルの法則に従って媒
体の屈折率と入射した面の法線に対する光の入射角によ
って決定されることによる。BEST MODE FOR CARRYING OUT THE INVENTION As shown in FIG. 1, a surface light source element of the present invention comprises an elongated light source 2, at least one light incident surface facing the light source 2 and a light emitting surface substantially orthogonal thereto. The light guide 1 is included, and the light-changing sheet 3 placed on the light exit surface of the light guide 1. In such a surface light source element, the light incident from the light source 2 into the light guide 1 is
Light having a distribution exceeding the critical angle repeats total reflection on the surface of the light guide 1 and propagates in the light guide 1. When the unevenness is formed on the surface of the light guide body 1, of the light reaching the unevenness portion, the light having a critical angle or less with respect to the unevenness is refracted and emitted to the outside of the light guide body 1, The exceeding light is totally reflected and propagates through the light guide 1. This is because the traveling direction of light is determined by the refractive index of the medium according to Snell's law and the incident angle of light with respect to the normal line of the incident surface.
【００１０】図２に、表面に凹凸を有する導光体１での
光の屈折および反射を模式的に示した。臨界角以内の入
射角ｉで凹凸部の斜面に入射した光Ａは、スネルの法則
によりｎｓｉｎｉ＝ｓｉｎｉ’（ｎは導光体の屈折率）
の関係を満足する出射角ｉ’で導光体１外に出射する。
一方、臨界角を超える入射角ｋで入射した光Ｂは、角度
ｋ’（ｋ’＝ｋ）で反射して導光体１内を伝搬する。一
旦、斜面部分に入射して反射した光は、次に凹凸部分に
入射する際に入射角が変化するため、導光体１外へ出射
する光が再び生じることになる。本発明者等は、面光源
素子において、ある点での光の出射強度（Ｉ）と光入射
面端での出射光強度（Ｉ0 ）との関係は、出射率
（α）、光入射面端からの距離（Ｌ’）および導光体１
の厚さ（ｔ）によって、実験的に次の（１）式で表され
ることを見出した。FIG. 2 schematically shows refraction and reflection of light in the light guide 1 having irregularities on the surface. The light A incident on the slope of the uneven portion at an incident angle i within the critical angle is nsini = sini '(n is the refractive index of the light guide) according to Snell's law.
The light is emitted to the outside of the light guide body 1 at an emission angle i ′ that satisfies the relationship.
On the other hand, the light B incident at the incident angle k exceeding the critical angle is reflected at the angle k ′ (k ′ = k) and propagates in the light guide 1. The light that once enters the inclined surface and is reflected changes the incident angle when it subsequently enters the uneven portion, so that the light that exits the light guide 1 is generated again. In the surface light source element, the present inventors have found that the relationship between the emission intensity (I) of light at a certain point and the emission light intensity (I 0 ) at the edge of the light incident surface is as follows. Distance from end (L ') and light guide 1
It was found experimentally by the thickness (t) of the following equation (1).
【００１１】[0011]
【数１】
Ｉ＝Ｉ0（１−α／１００）L'/t ・・・ （１）
（１）式から、導光体１の長さ（Ｌ）と厚さ（ｔ）が決
定すれば、出射率（α）によって光出射面内での輝度の
均一性が決定されることがわかる。なお、厚さｔｍｍの
導光体１の出射率（α）は、導光体１の光入射面端から
２０ｍｍ間隔で輝度の測定を行い、光入射面端からの距
離（Ｌ’）と導光体１の厚さ（ｔ）との比（Ｌ’／ｔ）
と輝度の対数のグラフから、その勾配（Ｋ）を求めて、
次の（２）式によって求められる。## EQU1 ## I = I 0 (1-α / 100) L '/ t (1) From equation (1), the length (L) and thickness (t) of the light guide 1 are determined. For example, it can be seen that the emission rate (α) determines the uniformity of brightness in the light emission surface. For the emission rate (α) of the light guide 1 having a thickness of tmm, the luminance is measured at intervals of 20 mm from the light incident surface end of the light guide 1, and the luminance (L ′) from the light incident surface end is calculated. Ratio (L '/ t) to the thickness (t) of the light body 1
From the graph of the logarithm of brightness and
It is calculated by the following equation (2).
【００１２】[0012]
【数２】α＝（１−１０K）×１００ ・・・ （２）
本発明においては、輝度分布の均一性の尺度として、次
の（３）式で示されるバラツキ度（Ｒ％）を用いて、面
光源素子における輝度分布の均一性についての評価およ
び検討を行った。バラツキ度（Ｒ％）は、導光体１のほ
ぼ中央部（光源２の長手方向に関する中央部）において
光入射面端から２０ｍｍ離れた点から対向する端部まで
の範囲内を２０ｍｍ間隔で輝度測定を行い、測定輝度の
最大値（Ｉmax ）、測定輝度の最小値（Ｉmin ）、測定
輝度の平均値（Ｉav）を求め、次の（３）式によって求
める。## EQU2 ## α = (1-10 K ) × 100 (2) In the present invention, the variation degree (R%) represented by the following equation (3) is used as a measure of the uniformity of the luminance distribution. Then, the evaluation and examination on the uniformity of the luminance distribution in the surface light source element were performed. The degree of variation (R%) is the luminance at a 20 mm interval within a range from a point 20 mm away from the end of the light incident surface to an end opposite to it in the substantially central part of the light guide 1 (central part in the longitudinal direction of the light source 2). The measurement is performed, the maximum value (I max ) of the measured brightness, the minimum value (I min ) of the measured brightness, and the average value (I av ) of the measured brightness are obtained, and are calculated by the following equation (3).
【００１３】[0013]
【数３】
Ｒ％＝｛（Ｉmax−Ｉmin）／Ｉav｝×１００ ・・・ （３）
その結果、出射率（α）とバラツキ度（Ｒ％）とは、導
光体１の長さ（Ｌ）と厚さ（ｔ）に依存して特定の関係
にあることが見出され、出射率（α）が大きくなるとバ
ラツキ度（Ｒ％）はそれに伴って増加し、出射率（α）
が一定であれば導光体１の長さ（Ｌ）と厚さ（ｔ）の比
（Ｌ／ｔ）が大きくなるに従ってバラツキ度（Ｒ％）も
大きくなる。すなわち、一定の大きさの導光体１におい
ては、導光体１の光出射面内での輝度分布の均一性（バ
ラツキ度）は、導光体１からの出射率（α）に依存する
ものであり、出射率（α）を制御することによって輝度
分布の均一性を図ることができることを見出した。## EQU00003 ## R% = {(I max −I min ) / I av } × 100 (3) As a result, the emission rate (α) and the variation degree (R%) are the values of the light guide 1. It was found that there is a specific relationship depending on the length (L) and the thickness (t), and when the emission rate (α) increases, the variation degree (R%) increases accordingly, and the emission rate (R) increases. α)
Is constant, the degree of variation (R%) also increases as the ratio (L / t) of the length (L) and the thickness (t) of the light guide 1 increases. That is, in the light guide 1 having a constant size, the uniformity (variation degree) of the luminance distribution in the light emission surface of the light guide 1 depends on the emission rate (α) from the light guide 1. It was found that the uniformity of the luminance distribution can be achieved by controlling the emission rate (α).
【００１４】一方、本発明者等は、導光体１として、そ
の光出射面から出射する出射光が図３に示したような特
定の指向性を有しているような導光体１を用いることに
よって、導光体１からの出射率（α）が低くなり、光出
射面での輝度分布の均一性を図ることができるというこ
とを見出した。すなわち、このような輝度分布の均一性
は、導光体１の光出射面からの出射光が、その最大光強
度を示すピークが光出射面の法線に対して６５度以上の
角度（ａ）であるような指向性を持って出射するような
導光体１とすることによって達成できる。これは、出射
光の最大光強度を示すピークが光出射面の法線に対して
６５度未満であると、導光体１からの出射率（α）が大
きくなり、光出射面での輝度分布の均一性を図ることが
できなくなるためであり、好ましくは７０度以上であ
る。On the other hand, the inventors of the present invention have shown that the light guide 1 has a specific directivity such that the light emitted from its light emission surface is as shown in FIG. It has been found that by using the light guide body 1, the emission rate (α) from the light guide body 1 becomes low, and the uniformity of the luminance distribution on the light emission surface can be achieved. That is, the uniformity of the brightness distribution is such that the light emitted from the light emitting surface of the light guide 1 has an angle (a at which the peak showing the maximum light intensity is 65 degrees or more with respect to the normal line of the light emitting surface). ) it can be achieved by a light guide 1 so as to emit with der so that directivity. This is because when the peak showing the maximum light intensity of the emitted light is less than 65 degrees with respect to the normal line of the light emitting surface, the emission rate (α) from the light guide body 1 becomes large and the brightness on the light emitting surface is increased. This is because the uniformity of distribution cannot be achieved, and it is preferably 70 degrees or more.
【００１５】また、前記のような輝度分布の均一性は、
図３に示したように、導光体１の光出射面からの出射光
が、その出射光分布において最大光強度を示すピークの
方向と最大光強度の５０％の光強度となる方向がなす角
度（ｂ）が２０度以下であるような出射特性を持って出
射するような導光体１とすることによっても達成でき
る。これは、出射光の最大光強度を示すピークの方向と
最大光強度の５０％となる方向とがなす角度（ｂ）が２
０度を超えると、導光体１からの出射率（α）が大きく
なり、光出射面での輝度分布の均一性を図ることができ
なくなるためである。Further, the uniformity of the brightness distribution as described above is
As shown in FIG. 3, the emitted light from the light emitting surface of the light guide body 1 has a peak direction showing the maximum light intensity in the emitted light distribution and a direction having a light intensity of 50% of the maximum light intensity. This can also be achieved by using the light guide body 1 that emits light with an emission characteristic such that the angle (b) is 20 degrees or less. This is because the angle (b) formed by the direction of the peak showing the maximum light intensity of the emitted light and the direction of 50% of the maximum light intensity is 2
This is because if it exceeds 0 degrees, the emission rate (α) from the light guide body 1 becomes large, and it becomes impossible to achieve uniform brightness distribution on the light emission surface.
【００１６】さらに、面光源素子においては、できるだ
け高い輝度が要求されるため、面光源素子からの出射光
が観察方向に集中していることが好ましい。このために
は、図３に示したように、導光体１からの出射光の最大
光強度を示すピークの方向と最大光強度の１０％の強度
を示す方向のなす角度（ｃ）を５０度以下とすることが
好ましい。これは、この角度（ｃ）が５０度を超える
と、光変角シートを使用しても観察方向以外の方向に出
射する光が多くなり、観察方向に十分に高い輝度が得ら
れない傾向にあるためである。Further, since the surface light source element is required to have as high a brightness as possible, it is preferable that the light emitted from the surface light source element is concentrated in the observation direction. For this purpose, as shown in FIG. 3, the angle (c) formed by the direction of the peak showing the maximum light intensity of the light emitted from the light guide 1 and the direction showing the intensity of 10% of the maximum light intensity is 50. It is preferably not more than a degree. This is because when the angle (c) exceeds 50 degrees, the amount of light emitted in a direction other than the viewing direction increases even if the light-changing sheet is used, and a sufficiently high luminance tends to be not obtained in the viewing direction. Because there is.
【００１７】本発明において、導光体１としては、ガラ
スや合成樹脂等の透明板状体を使用することができる。
合成樹脂としては、例えば、アクリル系樹脂、ポリカー
ボネート系樹脂、塩化ビニル系樹脂等の高透明性の種々
の合成樹脂を用いることができ、この樹脂を押出成形、
射出成形等の通常の成形方法で板状体に成形することに
よって導光体を製造することができる。特に、メタクリ
ル樹脂が、その光線透過率の高さ、耐熱性、力学的特
性、成形加工性にも優れており、導光体用材料として最
適である。このようなメタクリル樹脂とは、メタクリル
酸メチルを主成分とする樹脂であり、メタクリル酸メチ
ルが８０重量％以上であることが好ましい。また、導光
体１中には、光拡散剤や微粒子等を混入してもよい。In the present invention, as the light guide body 1, a transparent plate-like body such as glass or synthetic resin can be used.
As the synthetic resin, for example, various highly transparent synthetic resins such as acrylic resin, polycarbonate resin, and vinyl chloride resin can be used.
The light guide can be manufactured by molding into a plate-like body by a usual molding method such as injection molding. In particular, methacrylic resin is excellent as its light transmittance, heat resistance, mechanical properties, and moldability, and is optimal as a material for a light guide. Such a methacrylic resin is a resin containing methyl methacrylate as a main component, and methyl methacrylate is preferably 80% by weight or more. Further, a light diffusing agent, fine particles or the like may be mixed in the light guide 1.
【００１８】光出射面から出射する出射光が特定の指向
性を有するような導光体１を得る方法としては、特に限
定されるものではないが、例えば、導光体１の光出射面
あるいはその裏面の少なくとも一方に特定の光出射機能
を形成することによって得ることができる。このような
光出射機能としては、微小な凹凸を有する粗面とした
り、柱状のプリズム列、レンチキュラーレンズ列、多角
形状列等のレンズ列を多数平行に形成したレンズ面とし
たり、マイクロレンズ状、多角錐状、円錐状等の光学素
子を多数配列したレンズ面とする等の機構が挙げられ
る。中でも、微小な特定形状の凹凸を有する粗面とした
り、柱状のプリズム列やレンチキュラーレンズ列を多数
平行に形成したレンズ面としたものが好ましい。The method of obtaining the light guide 1 such that the light emitted from the light exit surface has a specific directivity is not particularly limited, but for example, the light exit surface of the light guide 1 or It can be obtained by forming a specific light emitting function on at least one of the back surfaces. As such a light emitting function, a rough surface having fine unevenness, a lens surface formed by parallelly forming a large number of lens rows such as columnar prism rows, lenticular lens rows, and polygonal rows, a microlens shape, A mechanism such as a lens surface in which a large number of optical elements having a polygonal pyramid shape or a conical shape are arranged can be used. Above all, it is preferable to use a rough surface having minute irregularities of a specific shape, or a lens surface having a large number of columnar prism rows or lenticular lens rows formed in parallel.
【００１９】導光体１の表面に特定形状の微小な凹凸を
形成する方法としては、例えば、種々の砥粒を用いてブ
ラスト処理を施した粗面を、フッ酸等を用いて化学エッ
チングした型、ガラスビーズ等の微粒子を吹き付けて粗
面化した型等を用いて、加熱プレス等によって粗面を転
写する方法、印刷法等によって透明な凹凸物質を塗布あ
るいは付着する方法、導光体１をブラスト法やエッチン
グ法等によって直接加工する方法等が挙げられる。As a method of forming minute irregularities of a specific shape on the surface of the light guide body 1, for example, a rough surface that has been blasted with various abrasive grains is chemically etched using hydrofluoric acid or the like. A mold, a method of spraying fine particles such as glass beads to make a rough surface, a method of transferring the rough surface by a heat press, a method of applying or attaching a transparent uneven material by a printing method, and the light guide 1. Examples of the method include a method of directly processing the blast by a blast method or an etching method.
【００２０】本発明の面光源素子は、上記のような導光
体１の一方の端部に蛍光灯等の光源２を配置し、光出射
面と対向する裏面には、反射フィルム等によって反射層
５が形成される。光源２から導光体１へ有効に光を導入
するために、光源および導光体１の光入射面を内側に反
射剤を塗布したケースやフィルムで覆うように構成され
る。また、導光体１としては、板状、くさび状、船型状
等の種々の形状のものが使用できる。In the surface light source element of the present invention, the light source 2 such as a fluorescent lamp is arranged at one end of the light guide 1 as described above, and the back surface facing the light emitting surface is reflected by a reflective film or the like. Layer 5 is formed. In order to effectively introduce light from the light source 2 to the light guide 1, the light source and the light incident surface of the light guide 1 are covered with a case or film coated with a reflective agent on the inside. Moreover, as the light guide 1, various shapes such as a plate shape, a wedge shape, and a boat shape can be used.
【００２１】本発明の面光源素子においては、通常、導
光体１からの出射光の出射特性は、その最大光強度を示
す方向が光出射面の法線から６５度以上の指向性を持っ
た光となるため、出射光を法線方向等の特定方向へ変角
させるために、導光体１の上に光変角シート３が載置さ
れる。この場合、使用される光変角シート３としては、
拡散シート、少なくとも一方の面に多数のレンズ単位が
平行に形成されたレンズ面を有するレンズシートなどが
挙げられる。レンズシートに形成されるレンズ形状は、
目的に応じて種々の形状のものが使用され、例えば、プ
リズム形状、レンチキュラーレンズ形状、波型形状等が
挙げられる。レンズシートのレンズ単位のピッチは３０
μｍ〜０．５ｍｍ程度とすることが好ましく、プリズム
シートを使用する場合には、そのプリズム頂角は導光体
からの出射光の出射角に応じて適宜選定されるが、一般
的には５０〜１２０゜の範囲とすることが好ましい。ま
た、プリズムシートの向きについても、導光体からの出
射光の出射角に応じて適宜選定され、レンズ面が導光体
側となるように載置してもよいし、逆向きに載置しても
よい。通常、上記のような微小な凹凸を有する粗面や微
小なレンズ列を多数形成したレンズ面から構成される表
面を有する導光体を用いる場合には、頂角が５０〜７０
゜のプリズムシートをプリズム面が導光体側となるよう
に載置することによって、ほぼ導光体の光出射面の法線
方向の出射光とすることができる。In the surface light source element of the present invention, the emission characteristics of the emitted light from the light guide body 1 usually have a directivity in which the direction showing the maximum light intensity is 65 degrees or more from the normal line of the light emission surface. Since the emitted light becomes light, the light-changing sheet 3 is placed on the light guide 1 in order to change the angle of the emitted light in a specific direction such as the normal direction. In this case, as the light-changing sheet 3 used,
Examples include a diffusion sheet and a lens sheet having a lens surface in which a large number of lens units are formed in parallel on at least one surface. The lens shape formed on the lens sheet is
Various shapes are used according to the purpose, and examples thereof include a prism shape, a lenticular lens shape, and a wave shape. The pitch of the lens unit of the lens sheet is 30
It is preferable that the thickness is about μm to 0.5 mm, and when a prism sheet is used, the apex angle of the prism is appropriately selected according to the emission angle of the light emitted from the light guide, but is generally 50. It is preferably in the range of 120 °. Also, the orientation of the prism sheet is appropriately selected according to the emission angle of the emitted light from the light guide body, and the prism sheet may be mounted so that the lens surface is on the light guide body side or the reverse direction. May be. Normally, when using a light guide having a rough surface having minute irregularities as described above or a surface composed of lens surfaces formed with a large number of minute lens rows, the apex angle is 50 to 70.
By mounting the prism sheet of (3) so that the prism surface is on the light guide side, the light can be emitted almost in the normal direction of the light emitting surface of the light guide.
【００２２】本発明の面光源素子においては、光変角シ
ート３は、必要に応じて複数枚を重ね合わせて使用する
ことができる。例えば、２枚のレンズシートを使用する
場合には、２枚のレンズシートが、それぞれのレンズ列
が互いに角度をなしてまたは平行するように積層して使
用することができる。レンズシートは、それぞれのレン
ズ面が上側または下側のいずれの方向となるように載置
することができ、また、双方のレンズシートのレンズ面
が反対方向となるように載置することもできる。本発明
の面光源素子においては、導光体に隣接する一枚目のレ
ンズシートをレンズ面が導光体側となり、そのレンズ列
が光源と平行となるように載置し、さらに２枚目のレン
ズシートをレンズ面が導光体と反対側となり、そのレン
ズ列が１枚目のレンズシートのレンズ列と直交するよう
に載置することが好ましい。この時、レンズシートとし
てプリズムシートを使用する場合には、１枚目のプリズ
ムシートは頂角５０〜７０゜のものを使用し、２枚目の
プリズムシートは頂角が８０〜１００゜のものを使用す
ることが好ましい。In the surface light source element of the present invention, a plurality of light-changing sheets 3 can be used by stacking them if necessary. For example, when two lens sheets are used, the two lens sheets can be laminated and used so that the respective lens rows form an angle or are parallel to each other. The lens sheets can be placed so that the respective lens surfaces are in the upper or lower direction, or the lens surfaces of both lens sheets can be in the opposite directions. . In the surface light source element of the present invention, the first lens sheet adjacent to the light guide is placed such that the lens surface is on the light guide side and the lens row is parallel to the light source. It is preferable to mount the lens sheet such that the lens surface is on the side opposite to the light guide and the lens row is orthogonal to the lens row of the first lens sheet. At this time, when a prism sheet is used as the lens sheet, the first prism sheet has an apex angle of 50 to 70 ° and the second prism sheet has an apex angle of 80 to 100 °. Is preferably used.
【００２３】本発明のレンズシートは、可視光透過率が
高く、屈折率の比較的高い材料を用いて製造することが
好ましく、例えば、アクリル系樹脂、ポリカーボネート
系樹脂、塩化ビニル系樹脂、活性エネルギー線硬化型樹
脂等が挙げられる。中でも、レンズシートの耐擦傷性、
取扱い性、生産性等の観点から活性エネルギー線硬化型
樹脂が好ましい。また、レンズシートには、必要に応じ
て、酸化防止剤、紫外線吸収剤、黄変防止剤、ブルーイ
ング剤、顔料、拡散剤等の添加剤を添加することもでき
る。レンズシートを製造する方法としては、押出成形、
射出成形等の通常の成形方法が使用できる。活性エネル
ギー線硬化型樹脂を用いてレンズシート３を製造する場
合には、ポリエステル系樹脂、アクリル系樹脂、ポリカ
ーボネート系樹脂、塩化ビニル系樹脂、ポリメタクリル
イミド系樹脂、ポリオレフィン系樹脂等の透明樹脂から
なる透明フィルムあるいはシート等の透明基材上に、活
性エネルギー線硬化型樹脂によってレンズ部を形成す
る。まず、所定のレンズパターンを形成したレンズ型に
活性エネルギー線硬化型樹脂液を注入し、透明基材を重
ね合わせる。次いで、透明基材を通して紫外線、電子線
等の活性エネルギー線を照射し、活性エネルギー線硬化
型樹脂液を重合硬化して、レンズ型から剥離してレンズ
シートを得る。The lens sheet of the present invention is preferably manufactured by using a material having a high visible light transmittance and a relatively high refractive index, such as an acrylic resin, a polycarbonate resin, a vinyl chloride resin, an active energy. Examples include line curable resins. Among them, the scratch resistance of the lens sheet,
The active energy ray-curable resin is preferable from the viewpoints of handleability and productivity. In addition, additives such as an antioxidant, an ultraviolet absorber, an anti-yellowing agent, a bluing agent, a pigment and a diffusing agent may be added to the lens sheet, if necessary. As a method for manufacturing a lens sheet, extrusion molding,
A usual molding method such as injection molding can be used. When the lens sheet 3 is manufactured by using the active energy ray-curable resin, transparent resin such as polyester resin, acrylic resin, polycarbonate resin, vinyl chloride resin, polymethacrylimide resin, and polyolefin resin is used. A lens portion is formed of an active energy ray-curable resin on a transparent substrate such as the transparent film or sheet. First, an active energy ray-curable resin liquid is injected into a lens mold having a predetermined lens pattern, and transparent base materials are superposed on each other. Next, active energy rays such as ultraviolet rays and electron rays are irradiated through the transparent base material to polymerize and cure the active energy ray-curable resin liquid, and peeled from the lens mold to obtain a lens sheet.
【００２４】本発明の面光源素子においては、上記した
ようなレンズシートの他に、拡散シート、カラーフィル
ター、偏光膜等、光学的に光を変角、集束、拡散させた
り、その光学特性を変化させる種々の光学素子を使用す
ることができる。このようにして構成された面光源素子
の光出射面側には、液晶表示素子を載置することによっ
て、ノートパソコン、液晶テレビ等に使用される液晶表
示装置として使用することができる。また、面光源素子
の光出射面側に、メタクリル板等の半透明のプラスッチ
ク板に切抜きや印刷等によって文字、図形、写真等を形
成した標示板４を載置することによって、駅や公共施設
等における案内標示板や大型看板、交通標識等の標示装
置ろして使用することができる。本発明において、光源
２としては、一般的な直管型の蛍光灯が使用できるが、
光源２の交換作業が困難な場合等には、複数の光ファイ
バーから構成されるラインライトを用いて別途設置され
た光源から光を伝送することもできる。In the surface light source element of the present invention, in addition to the lens sheet as described above, a diffusion sheet, a color filter, a polarizing film or the like may be used to optically change the angle of light, condense or diffuse the light, or change its optical characteristics. A variety of varying optical elements can be used. By mounting a liquid crystal display element on the light emitting surface side of the surface light source element thus configured, it can be used as a liquid crystal display device used in a notebook computer, a liquid crystal television, or the like. In addition, by placing a signboard 4 on a semi-transparent plastic plate such as a methacrylic plate on which a character, a figure, or a photograph is formed by cutting or printing, on the light emitting surface side of the surface light source element, a station or a public facility can be installed. It can be used as a sign device for guide signs, large signs, traffic signs, etc. In the present invention, a general straight tube type fluorescent lamp can be used as the light source 2,
When it is difficult to replace the light source 2, light can be transmitted from a separately installed light source using a line light composed of a plurality of optical fibers.
【００２５】[0025]
【実施例】以下、実施例により本発明を具体的に説明す
る。導光体からの出射光角度分布の測定
導光体の冷陰極管にインバーター（ＴＤＫ社製ＣＸＡ−
Ｍ１０Ｌ）を介して直流電源に接続し、ＤＣ１２Ｖを印
加して点灯させた。導光体を測定台に載置し、その中央
で冷陰極管軸と平行な回転軸で回転するように調節し
た。次いで、３ｍｍφのピンホールを有する黒色の紙
を、ピンホールが導光体の中央に位置するように導光体
上に固定し、輝度計（ミノルタ社製ｎｔ−１゜）を用い
て測定円が８〜９ｍｍφとなるように距離を調整した。
冷陰極管のエイジング時間が３０分以上経過後に、回転
軸を８５゜〜−８５゜まで１゜間隔で回転させ、輝度計
にて出射光の輝度を測定した。EXAMPLES The present invention will be specifically described below with reference to examples. Measurement of angle distribution of light emitted from light guide body Inverter (TDK CXA-
It was connected to a DC power supply via M10L) and 12V DC was applied to light it. The light guide was placed on the measuring table and adjusted so that the light guide was rotated about the axis of rotation parallel to the cold cathode tube axis at the center thereof. Then, a black paper having a 3 mmφ pinhole was fixed on the light guide so that the pinhole was located at the center of the light guide, and a measurement circle was measured using a luminance meter (Minolta nt-1 °). Was adjusted to be 8 to 9 mmφ.
After the aging time of the cold-cathode tube was 30 minutes or more, the rotating shaft was rotated from 85 ° to -85 ° at 1 ° intervals, and the luminance of the emitted light was measured with a luminance meter.
【００２６】この測定結果から、図３示したように、最
大光強度を示すピークの法線に対する角度（ａ）、最大
光強度を示すピーク方向と最大光強度の５０％の強度を
示す方向のなす角度（ｂ）、最大光強度を示すピーク方
向と最大光強度の１０％の強度を示す方向のなす角度
（ｃ）を求めた。From this measurement result, as shown in FIG. 3 , the angle (a) with respect to the normal line of the peak showing the maximum light intensity, the peak direction showing the maximum light intensity and the direction showing the intensity of 50% of the maximum light intensity are shown. The angle (b) formed and the angle (c) formed by the peak direction showing the maximum light intensity and the direction showing the intensity of 10% of the maximum light intensity were determined.
【００２７】面光源素子の法線輝度の測定（小型面光源
素子）
導光体の冷陰極管にインバーター（ＴＤＫ社製ＣＸＡ−
Ｍ１０Ｌ）を介して直流電源に接続し、ＤＣ１２Ｖを印
加して点灯させた。面光源素子を測定台に載置し、その
中央で冷陰極管軸と平行な回転軸で回転するように調節
した。次いで、３ｍｍφのピンホールを有する黒色の紙
を、ピンホールが導光体の中央に位置するように導光体
上に固定し、輝度計（ミノルタ社製ｎｔ−１゜）を用い
て測定円が８〜９ｍｍφとなるように距離を調整した。
冷陰極管のエイジング時間が３０分以上経過後に、回転
軸を０゜として輝度計にて出射光の輝度を測定した。測
定は、導光体の冷陰極管近傍の５ｍｍを除外して、他の
部分を２０ｍｍ角の正方形に区分し、各正方形の中心で
の輝度を測定した後、各測定値を平均して法線輝度とし
た。 Measurement of normal luminance of surface light source element (small surface light source element) Inverter (CXA-manufactured by TDK) for cold cathode tube of light guide
It was connected to a DC power supply via M10L) and 12V DC was applied to light it. The surface light source element was placed on a measuring table, and the center of the surface light source element was adjusted so as to rotate on a rotation axis parallel to the cold cathode tube axis. Then, a black paper having a 3 mmφ pinhole was fixed on the light guide so that the pinhole was located at the center of the light guide, and a measurement circle was measured using a luminance meter (Minolta nt-1 °). Was adjusted to be 8 to 9 mmφ.
After the aging time of the cold-cathode tube was 30 minutes or more, the brightness of the emitted light was measured by a brightness meter with the rotation axis set to 0 °. The measurement excludes 5 mm near the cold-cathode tube of the light guide, divides the other part into squares of 20 mm square, measures the brightness at the center of each square, and then averages each measured value. The line brightness was used.
【００２８】面光源素子の法線輝度の測定（大型面光源
素子）
光源として３０Ｗの蛍光灯を用いた以外は、小型面光源
素子の場合と同様にして測定を行った。出射率（α）
導光体の光入射面端から２０ｍｍ間隔で輝度の測定を行
い、光入射面端からの距離（Ｌ’）と導光体の厚さ
（ｔ）との比（Ｌ’／ｔ）と輝度の対数のグラフから、
その勾配（Ｋ）を求めて、前記（２）式によって求め
た。バラツキ度（Ｒ％）
導光体の光入射面と平行な方向のほぼ中央部において光
入射面端から５ｍｍ離れた点から対向する端部までの範
囲内を２０ｍｍ間隔で輝度測定を行い、測定輝度の最大
値（Ｉmax ）、測定輝度の最小値（Ｉmin ）、測定輝度
の平均値（Ｉav）を求め、前記（３）式によって求め
た。 Measurement of normal luminance of surface light source element (large surface light source element) Measurement was performed in the same manner as in the case of the small surface light source element except that a 30 W fluorescent lamp was used as a light source. Emission rate (α) Luminance is measured at 20 mm intervals from the light incident surface end of the light guide, and the ratio (L ′) of the distance (L ′) from the light incident surface end to the light guide thickness (t). / T) and the logarithm of brightness,
The gradient (K) was calculated and was calculated according to the equation (2). Roughness (R%) Luminance measurement is performed at 20 mm intervals within a range from a point 5 mm away from the end of the light incident surface to the opposite end at approximately the center in the direction parallel to the light incident surface of the light guide. The maximum value (I max ) of the luminance, the minimum value (I min ) of the measured luminance, and the average value (I av ) of the measured luminance were obtained, and they were obtained by the formula (3).
【００２９】実施例１
鏡面仕上げをしたステンレス板の表面を、粒径１２５〜
１４９μｍのガラスビーズ（不二製作所社製ＦＧＢ−１
２０）を用いて、ステンレス板から吹付けノズルまでの
距離を１０ｃｍとして、吹付け圧力４Ｋｇ／ｃｍ2 でブ
ラスト処理を行った。このステンレス板の型を用いて、
厚さが４ｍｍ、一辺が２１０ｍｍ、他辺が１６５ｍｍの
透明アクリル樹脂板の一方の表面に熱転写によって粗面
を転写し導光体とした。得られた導光体の１６５ｍｍの
二つの端面および他の一方の端面に銀蒸着したＰＥＴフ
ィルムを粘着加工して貼り付け、粗面化した光出射面と
対向する裏面に銀蒸着したＰＥＴフィルムをテープ止め
して反射面を形成した。導光体の残りの一つの端面に銀
蒸着したＰＥＴフィルムで冷陰極管松下電器社製ＫＣ２
３０Ｔ４Ｅ４ｍｍφ×２３０ｍｍ）を巻き付けて導光体
に固定した。この導光体を用いて、導光体からの出射光
角度分布を測定し、最大光強度を示すピークの法線に対
する角度（ピーク角）、最大光強度を示すピーク方向と
最大光強度の５０％の強度を示す方向のなす角度（ピー
ク−５０％角）、最大光強度を示すピーク方向と最大光
強度の１０％の強度を示す方向のなす角度（ピーク−１
０％角）を求めて表１に示した。Example 1 The surface of a mirror-finished stainless steel plate had a particle size of 125-125.
149 μm glass beads (FGB-1 manufactured by Fuji Manufacturing Co., Ltd.
Using 20), the distance from the stainless steel plate to the spray nozzle was 10 cm, and the blast treatment was performed at a spray pressure of 4 Kg / cm 2 . Using this stainless steel plate mold,
A rough surface was transferred by thermal transfer to one surface of a transparent acrylic resin plate having a thickness of 4 mm, one side of 210 mm, and the other side of 165 mm to obtain a light guide. The 165 mm two end faces and the other one end face of the obtained light guide were adhered with a silver vapor-deposited PET film, and a roughened light emitting face was provided with a silver vapor-deposited PET film on the opposite side. Taped to form a reflective surface. Cold cathode tube made by PET film with silver deposited on the other end face of the light guide KC2 made by Matsushita Electric Co., Ltd.
30T4E4 mmφ × 230 mm) was wound and fixed to the light guide. Using this light guide, the angle distribution of light emitted from the light guide is measured, and the angle (peak angle) with respect to the normal line of the peak showing the maximum light intensity, the peak direction showing the maximum light intensity, and the maximum light intensity of 50. %, The angle formed by the direction showing the intensity of 50% (peak-50% angle), the angle formed by the peak direction showing the maximum light intensity and the direction showing the intensity of 10% of the maximum light intensity (peak-1
The 0% angle) was obtained and shown in Table 1.
【００３０】得られた導光体の光出射面上にＰＥＴフィ
ルムに屈折率１．５３のアクリル系紫外線硬化樹脂で、
頂角６３゜、ピッチ５０μｍのプリズム列を平行に多数
形成したプリズムシートを、プリズム面が導光体の光出
射面側に向き、プリズム列が光源と直交するように載置
して面光源素子とした。得られた面光源素子の法線輝度
およびバラツキ度（Ｒ％）を求めて表１に示した。一
方、同一のステンレス板の型を用いて、厚さが４ｍｍ、
一辺が９０ｍｍ、他辺が３００ｍｍの透明アクリル樹脂
板の一方の表面に熱転写によって粗面を転写し導光体と
した。得られた導光体の３００ｍｍの二つの端面に銀蒸
着したＰＥＴフィルムを粘着加工して貼り付け、粗面化
した光出射面と対向する裏面に銀蒸着したＰＥＴフィル
ムをテープ止めして反射面を形成した。導光体の残りの
一つの端面に銀蒸着したＰＥＴフィルムで冷陰極管松下
電器社製ＫＣ１３０Ｔ４Ｅ４ｍｍφ×１３０ｍｍ）を巻
き付けて導光体に固定した。この導光体を用いて、光出
射面からの出射率（α）を求め表１に示した。On the light emitting surface of the obtained light guide, a PET film was coated with an acrylic ultraviolet curing resin having a refractive index of 1.53.
A surface light source element in which a prism sheet in which a large number of prism rows having an apex angle of 63 ° and a pitch of 50 μm are formed in parallel is placed so that the prism surface faces the light emitting surface side of the light guide and the prism rows are orthogonal to the light source. And The normal luminance and the degree of variation (R%) of the obtained surface light source element were determined and shown in Table 1. On the other hand, using the same stainless steel plate mold, the thickness is 4 mm,
A rough surface was transferred by thermal transfer to one surface of a transparent acrylic resin plate having one side of 90 mm and the other side of 300 mm to obtain a light guide. A silver vapor-deposited PET film is adhered to and pasted on the two 300 mm end faces of the obtained light guide, and a silver vapor-deposited PET film is taped to the back surface opposite to the roughened light emitting surface, and the reflective surface is provided. Was formed. A cold-cathode tube (KC130T4E4 mmφ × 130 mm manufactured by Matsushita Electric Industrial Co., Ltd.) was wrapped around a PET film deposited with silver on the other end face of the light guide and fixed to the light guide. Using this light guide, the emission rate (α) from the light emission surface was determined and shown in Table 1.
【００３１】実施例２
ガラス板の表面を、粒径１２５〜１４９μｍのガラスビ
ーズ（不二製作所社製ＦＧＢ−１２０）を用いて、ガラ
ス板から吹付けノズルまでの距離を１０ｃｍとして、吹
付け圧力４Ｋｇ／ｃｍ2 でブラスト処理を行った。その
後、フッ酸処理を行うことによりブラスト面の化学エッ
チングを行い、電鋳によりレプリカ型を取って得た電鋳
型を用いて、厚さが４ｍｍ、一辺が２１０ｍｍ、他辺が
１６５ｍｍの透明アクリル樹脂板の一方の表面に熱転写
によって粗面を転写し導光体とした。得られた導光体に
実施例１と同様にして光源を固定し、導光体からの出射
光角度分布を測定し、ピーク角、ピーク−５０％角、ピ
ーク−１０％角を求めて表１に示した。得られた導光体
を用いて、実施例１と同様にして面光源素子を構成し
た。得られた面光源素子の法線輝度、輝度比（実施例１
の法線輝度に対する比率）およびバラツキ度（Ｒ％）を
求めて表１に示した。一方、同一の電鋳型を用いて、実
施例１と同様にして導光体を得るとともに、光源を固定
し、光出射面からの出射率（α）を求め表１に示した。Example 2 The surface of a glass plate was sprayed with glass beads having a particle size of 125 to 149 μm (FGB-120 manufactured by Fuji Seisakusho Co., Ltd.) at a distance of 10 cm from the glass plate to the spraying nozzle. Blast treatment was performed at 4 Kg / cm 2 . After that, the blast surface is chemically etched by hydrofluoric acid treatment, and an electroforming mold obtained by taking a replica mold by electroforming is used to obtain a transparent acrylic resin having a thickness of 4 mm, one side of 210 mm, and the other side of 165 mm. A rough surface was transferred onto one surface of the plate by thermal transfer to obtain a light guide. A light source was fixed to the obtained light guide in the same manner as in Example 1, the angular distribution of light emitted from the light guide was measured, and the peak angle, peak -50% angle, and peak -10% angle were calculated and displayed. Shown in 1. Using the obtained light guide, a surface light source element was constructed in the same manner as in Example 1. Normal luminance and luminance ratio of the obtained surface light source element (Example 1
The ratio to the normal luminance of the above) and the degree of variation (R%) were obtained and shown in Table 1. On the other hand, using the same electroforming mold, a light guide was obtained in the same manner as in Example 1, the light source was fixed, and the emission rate (α) from the light emission surface was obtained and shown in Table 1.
【００３２】実施例３
透明アクリル樹脂板の厚さを３ｍｍとした以外は、実施
例２と同様にして導光体を得た。得られた導光体に実施
例１と同様にして光源を固定し、導光体からの出射光角
度分布を測定し、ピーク角、ピーク−５０％角、ピーク
−１０％角を求めて表１に示した。得られた導光体を用
いて、実施例１と同様にして面光源素子を構成した。得
られた面光源素子の法線輝度、輝度比（実施例１の法線
輝度に対する比率）およびバラツキ度（Ｒ％）を求めて
表１に示した。一方、透明アクリル樹脂板の厚さを３ｍ
ｍとした以外は、実施例２と同様にして導光体を得ると
ともに、光源を固定し、光出射面からの出射率（α）を
求め表１に示した。Example 3 A light guide was obtained in the same manner as in Example 2 except that the thickness of the transparent acrylic resin plate was 3 mm. A light source was fixed to the obtained light guide in the same manner as in Example 1, the angular distribution of light emitted from the light guide was measured, and the peak angle, peak -50% angle, and peak -10% angle were calculated and displayed. Shown in 1. Using the obtained light guide, a surface light source element was constructed in the same manner as in Example 1. The normal luminance, the luminance ratio (ratio to the normal luminance of Example 1) and the degree of variation (R%) of the obtained surface light source element were determined and shown in Table 1. On the other hand, the thickness of the transparent acrylic resin plate is 3m
A light guide was obtained in the same manner as in Example 2 except that m was set, the light source was fixed, and the emission rate (α) from the light emission surface was obtained and shown in Table 1.
【００３３】実施例４
透明アクリル樹脂板として、２１０ｍｍの一端の厚さが
３ｍｍで、他端の厚さが１ｍｍのくさび状のものを用い
た以外は、実施例２と同様にして導光体を得た。得られ
た導光体に実施例１と同様にして光源を固定し、導光体
からの出射光角度分布を測定し、ピーク角、ピーク−５
０％角、ピーク−１０％角を求めて表１に示した。得ら
れた導光体を用いて、実施例１と同様にして面光源素子
を構成した。得られた面光源素子の法線輝度、輝度比
（実施例１の法線輝度に対する比率）およびバラツキ度
（Ｒ％）を求めて表１に示した。一方、得られた導光体
の１６５ｍｍの二つの端面に銀蒸着したＰＥＴフィルム
を粘着加工して貼り付け、粗面化した光出射面と対向す
る裏面に銀蒸着したＰＥＴフィルムをテープ止めして反
射面を形成した。導光体の残りの一つの端面に銀蒸着し
たＰＥＴフィルムで冷陰極管松下電器社製ＫＣ２３０Ｔ
４Ｅ４ｍｍφ×２３０ｍｍ）を巻き付けて導光体に固定
した。この導光体を用いて、光出射面からの出射率
（α）を求め表１に示した。Example 4 A light guide was prepared in the same manner as in Example 2 except that a wedge-shaped transparent acrylic resin plate having a thickness of 210 mm at one end of 3 mm and a thickness of the other end of 1 mm was used. Got A light source was fixed to the obtained light guide in the same manner as in Example 1, and the angular distribution of light emitted from the light guide was measured.
The 0% angle and the peak-10% angle were determined and shown in Table 1. Using the obtained light guide, a surface light source element was constructed in the same manner as in Example 1. The normal luminance, the luminance ratio (ratio to the normal luminance of Example 1) and the degree of variation (R%) of the obtained surface light source element were determined and shown in Table 1. On the other hand, a silver vapor-deposited PET film was adhered to and pasted on the two 165 mm end faces of the obtained light guide, and the silver vapor-deposited PET film was taped to the back surface facing the roughened light emitting surface. A reflective surface was formed. Cold-cathode tube KC230T made by Matsushita Electric Industrial Co., Ltd. with a PET film deposited with silver on the other end face of the light guide.
4E4 mmφ × 230 mm) was wound and fixed to the light guide. Using this light guide, the emission rate (α) from the light emission surface was determined and shown in Table 1.
【００３４】比較例１
ブラスト処理のガラスビーズとして粒径７４〜８８μｍ
（不二製作所社製ＦＧＢ−２００）を用いるとともに、
透明アクリル樹脂板の厚さを３ｍｍとした以外は、実施
例１と同様にして導光体を得た。得られた導光体に実施
例１と同様にして光源を固定し、導光体からの出射光角
度分布を測定し、ピーク角、ピーク−５０％角、ピーク
−１０％角を求めて表１に示した。得られた導光体を用
いて、実施例１と同様にして面光源素子を構成した。得
られた面光源素子の法線輝度、輝度比（実施例１の法線
輝度に対する比率）およびバラツキ度（Ｒ％）を求めて
表１に示した。一方、同一の電鋳型を用いて、実施例１
と同様にして導光体を得るとともに、光源を固定し、光
出射面からの出射率（α）を求め表１に示した。Comparative Example 1 Particle diameter of 74 to 88 μm as blast-treated glass beads
(Fuji Manufacturing Co., Ltd. FGB-200) is used,
A light guide was obtained in the same manner as in Example 1 except that the thickness of the transparent acrylic resin plate was 3 mm. A light source was fixed to the obtained light guide in the same manner as in Example 1, the angular distribution of light emitted from the light guide was measured, and the peak angle, peak -50% angle, and peak -10% angle were calculated and displayed. Shown in 1. Using the obtained light guide, a surface light source element was constructed in the same manner as in Example 1. The normal luminance, the luminance ratio (ratio to the normal luminance of Example 1) and the degree of variation (R%) of the obtained surface light source element were determined and shown in Table 1. On the other hand, using the same electroforming mold, Example 1
The light guide was obtained in the same manner as described above, the light source was fixed, and the emission rate (α) from the light emission surface was determined and shown in Table 1.
【００３５】比較例２
透明アクリル樹脂板の厚さを４ｍｍとした以外は、比較
例１と同様にして導光体を得た。得られた導光体に実施
例１と同様にして光源を固定し、導光体からの出射光角
度分布を測定し、ピーク角、ピーク−５０％角、ピーク
−１０％角を求めて表１に示した。得られた導光体を用
いて、実施例１と同様にして面光源素子を構成した。得
られた面光源素子の法線輝度、輝度比（実施例１の法線
輝度に対する比率）およびバラツキ度（Ｒ％）を求めて
表１に示した。一方、同一の電鋳型を用いて、透明アク
リル樹脂板の厚さを３ｍｍとした以外は、実施例１と同
様にして導光体を得るとともに、光源を固定し、光出射
面からの出射率（α）を求め表１に示した。Comparative Example 2 A light guide was obtained in the same manner as Comparative Example 1 except that the transparent acrylic resin plate had a thickness of 4 mm. A light source was fixed to the obtained light guide in the same manner as in Example 1, the angular distribution of light emitted from the light guide was measured, and the peak angle, peak -50% angle, and peak -10% angle were calculated and displayed. Shown in 1. Using the obtained light guide, a surface light source element was constructed in the same manner as in Example 1. The normal luminance, the luminance ratio (ratio to the normal luminance of Example 1) and the degree of variation (R%) of the obtained surface light source element were determined and shown in Table 1. On the other hand, using the same electroforming mold, except that the thickness of the transparent acrylic resin plate was 3 mm, a light guide was obtained in the same manner as in Example 1, the light source was fixed, and the emission rate from the light emission surface was obtained. (Α) was determined and is shown in Table 1.
【００３６】比較例３
ブラスト処理のガラスビーズとして粒径５３〜６３μｍ
（不二製作所社製ＦＧＢ−３００）を用い、吹付け圧力
を５Ｋｇ／ｃｍ2 とした以外は、実施例１と同様にして
導光体を得た。得られた導光体に実施例１と同様にして
光源を固定し、導光体からの出射光角度分布を測定し、
ピーク角、ピーク−５０％角、ピーク−１０％角を求め
て表１に示した。得られた導光体を用いて、実施例１と
同様にして面光源素子を構成した。得られた面光源素子
の法線輝度、輝度比（実施例１の法線輝度に対する比
率）およびバラツキ度（Ｒ％）を求めて表１に示した。
一方、同一の電鋳型を用いて、実施例１と同様にして導
光体を得るとともに、光源を固定し、光出射面からの出
射率（α）を求め表１に示した。Comparative Example 3 Blast-treated glass beads having a particle size of 53 to 63 μm
A light guide was obtained in the same manner as in Example 1 except that (FGB-300 manufactured by Fuji Seisakusho Co., Ltd.) was used and the spraying pressure was set to 5 Kg / cm 2 . A light source was fixed to the obtained light guide in the same manner as in Example 1, and the angle distribution of light emitted from the light guide was measured.
The peak angle, the peak-50% angle and the peak-10% angle were determined and shown in Table 1. Using the obtained light guide, a surface light source element was constructed in the same manner as in Example 1. The normal luminance, the luminance ratio (ratio to the normal luminance of Example 1) and the degree of variation (R%) of the obtained surface light source element were determined and shown in Table 1.
On the other hand, using the same electroforming mold, a light guide was obtained in the same manner as in Example 1, the light source was fixed, and the emission rate (α) from the light emission surface was obtained and shown in Table 1.
【００３７】実施例５
厚さが１０ｍｍ、一辺が６００ｍｍ、他辺が１２５０ｍ
ｍの透明アクリル樹脂板を用いた以外は、実施例２と同
様にして導光体を得た。得られた導光体の１２５０ｍｍ
の二つの端面および他の一方の端面に銀蒸着したＰＥＴ
フィルムを粘着加工して貼り付け、粗面化した光出射面
と対向する裏面に銀蒸着したＰＥＴフィルムをテープ止
めして反射面を形成した。導光体の残りの一つの端面に
３０Ｗの蛍光灯（ＦＳＬ３０Ｔ６Ｗ）を設置した。この
導光体を用いて、導光体からの出射光角度分布を測定
し、ピーク角、ピーク−５０％角、ピーク−１０％角を
求めて表１に示した。Example 5 Thickness is 10 mm, one side is 600 mm, and the other side is 1250 m
A light guide was obtained in the same manner as in Example 2 except that the transparent acrylic resin plate of m was used. 1250 mm of the obtained light guide
With silver vapor deposited on the two end faces and the other end face of
The film was adhesively processed and attached, and a PET film vapor-deposited with silver was taped to the back surface facing the roughened light emitting surface to form a reflection surface. A 30 W fluorescent lamp (FSL30T6W) was installed on the other end face of the light guide. Using this light guide, the angular distribution of light emitted from the light guide was measured, and the peak angle, the peak-50% angle, and the peak-10% angle were determined and shown in Table 1.
【００３８】得られた導光体の光出射面上にＰＥＴフィ
ルムに屈折率１．５３のアクリル系紫外線硬化樹脂で、
頂角６３゜、ピッチ５０μｍのプリズム列を平行に多数
形成したプリズムシートを、プリズム面が導光体の光出
射面側に向き、プリズム列が光源と直交するように載置
して面光源素子とした。得られた面光源素子の法線輝度
およびバラツキ度（Ｒ％）を求めて表１に示した。一
方、得られた導光体の１２５０ｍｍの二つの端面に銀蒸
着したＰＥＴフィルムを粘着加工して貼り付け、粗面化
した光出射面と対向する裏面に銀蒸着したＰＥＴフィル
ムをテープ止めして反射面を形成した。導光体の残りの
一つの端面に３０Ｗの蛍光灯（ＦＳＬ３０Ｔ６Ｗ）を設
置した。この導光体を用いて、光出射面からの出射率
（α）を求め表１に示した。On the light emitting surface of the obtained light guide, a PET film was coated with an acrylic UV curable resin having a refractive index of 1.53.
A surface light source element in which a prism sheet in which a large number of prism rows having an apex angle of 63 ° and a pitch of 50 μm are formed in parallel is placed so that the prism surface faces the light emitting surface side of the light guide and the prism rows are orthogonal to the light source. And The normal luminance and the degree of variation (R%) of the obtained surface light source element were determined and shown in Table 1. On the other hand, a silver vapor-deposited PET film was adhered and adhered to the two 1250 mm end faces of the obtained light guide, and the silver vapor-deposited PET film was taped to the back surface opposite to the roughened light emitting surface. A reflective surface was formed. A 30 W fluorescent lamp (FSL30T6W) was installed on the other end face of the light guide. Using this light guide, the emission rate (α) from the light emission surface was determined and shown in Table 1.
【００３９】比較例４
厚さが１０ｍｍ、一辺が６００ｍｍ、他辺が１２５０ｍ
ｍの透明アクリル樹脂板を用いた以外は、比較例１と同
様にして導光体を得た。得られた導光体に実施例５と同
様にして光源を設置し、導光体からの出射光角度分布を
測定し、ピーク角、ピーク−５０％角、ピーク−１０％
角を求めて表１に示した。得られた導光体を用いて、実
施例７と同様にして面光源素子を構成した。得られた面
光源素子の法線輝度およびバラツキ度（Ｒ％）を求めて
表１に示した。一方、得られた導光体を用いて、実施例
５と同様にして導光体を得るとともに、光源を固定し、
光出射面からの出射率（α）を求め表１に示した。Comparative Example 4 Thickness is 10 mm, one side is 600 mm, and the other side is 1250 m.
A light guide was obtained in the same manner as in Comparative Example 1 except that the transparent acrylic resin plate of m was used. A light source was installed on the obtained light guide in the same manner as in Example 5, and the angular distribution of light emitted from the light guide was measured. The peak angle, the peak-50% angle, and the peak-10% were measured.
The corners were determined and shown in Table 1. Using the obtained light guide, a surface light source element was formed in the same manner as in Example 7. The normal luminance and the degree of variation (R%) of the obtained surface light source element were determined and shown in Table 1. On the other hand, using the obtained light guide, a light guide was obtained in the same manner as in Example 5, and the light source was fixed.
The emission rate (α) from the light emission surface was determined and is shown in Table 1.
【００４０】[0040]
【表１】 [Table 1]
【００４１】[0041]
【発明の効果】本発明は、導光体として、その光出射面
からの出射光の最大光強度を示すピークが法線に対して
６５度以上の角度で出射するような導光体、あるいは、
出射光の最大光強度を示すピークの方向と最大光強度の
５０％の光強度となる方向がなす角度が２０度以下で出
射するような導光体を用いることによって、高い輝度を
有するとともに、光出射面内での均一な輝度分布が得ら
れ、液晶標示装置、案内標示板、看板、交通標識等の種
々の用途に使用される面光源素子用導光体および面光源
素子を提供できるものである。INDUSTRIAL APPLICABILITY The present invention provides, as a light guide, a light guide whose peak showing the maximum light intensity of light emitted from its light emitting surface is emitted at an angle of 65 degrees or more with respect to the normal line. ,
By using a light guide that emits at an angle of 20 degrees or less between the direction of the peak indicating the maximum light intensity of the emitted light and the direction of the light intensity of 50% of the maximum light intensity, the light guide has high brightness, and A light guide for a surface light source element and a surface light source element that can obtain a uniform luminance distribution in a light emitting surface and are used in various applications such as a liquid crystal sign device, a guide sign plate, a signboard, and a traffic sign. Is.
【図１】本発明の面光源素子の構成を示す概略図であ
る。FIG. 1 is a schematic diagram showing a configuration of a surface light source element of the present invention.
【図２】本発明の導光体の粗面における光の光路を示す
概略図である。FIG. 2 is a schematic view showing an optical path of light on a rough surface of a light guide according to the present invention.
【図３】本発明の導光体からの出射光分布のモデルを示
すグラフである。FIG. 3 is a graph showing a model of a distribution of emitted light from a light guide according to the present invention .
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平１−244490（ＪＰ，Ａ) 国際公開95／027915（ＷＯ，Ａ１) (58)調査した分野(Int.Cl.7，ＤＢ名) G02B 6/00 F21V 8/00 G02F 1/1335 - 1/13363 G09F 9/00 G09F 13/18 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-1-244490 (JP, A) International Publication 95/027915 (WO, A1) (58) Fields investigated (Int.Cl. 7 , DB name) G02B 6/00 F21V 8/00 G02F 1/1335-1/13363 G09F 9/00 G09F 13/18
Claims (6)
光入射面とし、これと略直交する光出射面とを有し、光
出射面およびその裏面の少なくとも一方の表面に光出射
機能を具備しており、導光体の光出射面からの出射光の
最大光強度を示すピークが法線に対して６５度以上の角
度にあり、出射光の最大光強度を示すピークの方向と最
大光強度の５０％の光強度となる方向がなす角度が２０
度以下であることを特徴とする面光源素子用導光体。1. A plate-shaped transparent body has at least one side end surface as a light incident surface and a light emitting surface substantially orthogonal to the light incident surface, and a light emitting function is provided on at least one surface of the light emitting surface and the back surface thereof. It is equipped with the output light from the light output surface of the light guide.
The peak showing the maximum light intensity is at an angle of 65 degrees or more to the normal
The angle formed by the direction of the peak indicating the maximum light intensity of the emitted light and the direction of 50% of the maximum light intensity is 20 degrees.
A light guide for a surface light source element, which is less than or equal to 100 degrees.
強度を示すピークの方向と最大光強度の１０％の光強度
となる方向がなす角度が５０度以下であることを特徴と
する請求項１記載の面光源素子用導光体。2. The angle formed by the direction of the peak showing the maximum light intensity of the light emitted from the light emitting surface of the light guide and the direction having a light intensity of 10% of the maximum light intensity is 50 degrees or less. The light guide for a surface light source element according to claim 1.
出射光分布において法線近傍で極小値を有することを特
徴とする請求項１または２に記載の面光源素子用導光
体。 3. The light emitted from the light emitting surface of the light guide is
The output light distribution has a minimum value near the normal.
The light guide for a surface light source element according to claim 1 or 2.
body.
つの光入射面およびこれと略直交する光出射面を有する
導光体と、導光体の光出射面に載置された光変角シート
とからなり、該導光体の光出射面およびその裏面の少な
くとも一方の表面に光出射機能を具備しており、導光体
の光出射面からの出射光の最大光強度を示すピークが法
線に対して６５度以上の角度にあり、出射光の最大光強
度を示すピークの方向と最大光強度の５０％の光強度と
なる方向がなす角度が２０度以下であり、該出射光が前
記光変角シートにより所望の方向に変角されていること
を特徴とする面光源素子。4. A light source, a light guide having at least one light-incident surface facing the light source and a light-exiting surface substantially orthogonal to the light-incidence surface, and a light-changing angle mounted on the light-exiting surface of the light guide. It consists of a sheet, which comprises a light emitting function on the light emitting surface and at least one surface of the back surface of the light guide body, the light guide
The peak showing the maximum light intensity of the light emitted from the
The angle is 65 degrees or more with respect to the line, and the angle formed by the direction of the peak indicating the maximum light intensity of the emitted light and the direction in which the light intensity is 50% of the maximum light intensity is 20 degrees or less. A surface light source element, which is bent in a desired direction by the light-changing sheet.
強度を示すピークの方向と最大光強度の１０％の光強度
となる方向がなす角度が５０度以下であることを特徴と
する請求項４記載の面光源素子。5. The angle formed by the direction of the peak showing the maximum light intensity of the light emitted from the light emitting surface of the light guide and the direction having a light intensity of 10% of the maximum light intensity is 50 degrees or less. The surface light source element according to claim 4.
出射光分布において法線近傍で極小値を有することを特
徴とする請求項４または５に記載の面光源素子。 6. The light emitted from the light emitting surface of the light guide is
The output light distribution has a minimum value near the normal.
The surface light source element according to claim 4, which is a characteristic.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP01571797A JP3442247B2 (en) | 1996-02-01 | 1997-01-29 | Light guide for surface light source element and surface light source element |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8-16928 | 1996-01-02 | ||
| JP1692896 | 1996-02-01 | ||
| JP01571797A JP3442247B2 (en) | 1996-02-01 | 1997-01-29 | Light guide for surface light source element and surface light source element |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09329715A JPH09329715A (en) | 1997-12-22 |
| JP3442247B2 true JP3442247B2 (en) | 2003-09-02 |
Family
ID=26351914
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP01571797A Expired - Lifetime JP3442247B2 (en) | 1996-02-01 | 1997-01-29 | Light guide for surface light source element and surface light source element |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3442247B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010106990A1 (en) | 2009-03-18 | 2010-09-23 | 日東電工株式会社 | Light diffusing element, polarizing plate with light diffusing element, liquid crystal display using both, and manufacturing method for light diffusing element |
| WO2011065490A1 (en) | 2009-11-30 | 2011-06-03 | 日東電工株式会社 | Liquid crystal display device |
| WO2012036271A1 (en) | 2010-09-17 | 2012-03-22 | 日東電工株式会社 | Light-diffusing element, polarizer having light-diffusing element, and liquid crystal display device having same |
| WO2012036270A1 (en) | 2010-09-17 | 2012-03-22 | 日東電工株式会社 | Light-diffusing element, polarizing plate having light-diffusing element attached thereto, polarizing element, and liquid crystal display device equipped with those components |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000106022A (en) * | 1998-07-29 | 2000-04-11 | Mitsubishi Rayon Co Ltd | Surface light source device and liquid crystal display device |
| JP2008310360A (en) * | 2008-09-05 | 2008-12-25 | Kuraray Co Ltd | Synthetic resin molding superior in light transmission/diffusion |
| JP6377887B2 (en) * | 2012-02-17 | 2018-08-22 | 学校法人慶應義塾 | Liquid crystal display |
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1997
- 1997-01-29 JP JP01571797A patent/JP3442247B2/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010106990A1 (en) | 2009-03-18 | 2010-09-23 | 日東電工株式会社 | Light diffusing element, polarizing plate with light diffusing element, liquid crystal display using both, and manufacturing method for light diffusing element |
| WO2011065490A1 (en) | 2009-11-30 | 2011-06-03 | 日東電工株式会社 | Liquid crystal display device |
| WO2012036271A1 (en) | 2010-09-17 | 2012-03-22 | 日東電工株式会社 | Light-diffusing element, polarizer having light-diffusing element, and liquid crystal display device having same |
| WO2012036270A1 (en) | 2010-09-17 | 2012-03-22 | 日東電工株式会社 | Light-diffusing element, polarizing plate having light-diffusing element attached thereto, polarizing element, and liquid crystal display device equipped with those components |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH09329715A (en) | 1997-12-22 |
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