【０００１】[0001]
【発明の属する技術分野】本発明は、入光端面から入射
された光を反射面で反射して出射面から出射し、これに
より照射対象物を照明する導光板に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light guide plate for illuminating an object to be illuminated by reflecting light incident from a light incident end surface on a reflection surface and emitting the light from an emission surface.
【０００２】[0002]
【従来の技術】今日、たとえば携帯電話などの電子装置
における表示手段として使用されているＬＣＤ（Ｌｉｑ
ｕｉｄ Ｃｒｙｓｔａｌ Ｄｉｓｐｌａｙ・液晶ディス
プレイ）などの表示部には、省電力化、軽量化、薄型化
などを達成するために、当該ＬＣＤを背面から照射する
バックライト方式ではなく、前面から照射するフロント
ライト方式が数多く採用されている。2. Description of the Related Art LCDs (Liqs) which are used as display means in electronic devices such as mobile phones today.
The display unit such as a liquid crystal display (uid Crystal Display) is not a backlight system that illuminates the LCD from the back but a front light system that illuminates the LCD from the front in order to achieve power saving, weight reduction, and thinning. Has been adopted in many cases.
【０００３】そして、このようなフロントライト方式を
実現するには、ＬＥＤ（ＬｉｇｈｔＥｍｉｔｔｉｎｇ
Ｄｉｏｄｅ・発光ダイオード）から出射して線状導光体
で線状の発光面が形成された光を入光端面から取り込
み、これを反射面で反射して出射面から出射してＬＣＤ
を照射する導光板が用いられている。In order to realize such a front light system, an LED (Light Emitting) is used.
The light emitted from a diode (light-emitting diode) and having a linear light-emitting surface formed by a linear light guide is taken in from a light-entering end face, reflected by a reflective surface, and emitted from an output surface to be emitted from an LCD.
Is used.
【０００４】従来において、このような導光板の反射面
は、たとえば特許第３０１２４６２号公報や特許第２９
２５５３０号公報に開示されているように、プリズムア
レイが断面鋸歯状に形成されたものが知られている。Conventionally, the reflection surface of such a light guide plate is disclosed in, for example, Japanese Patent No.
As disclosed in Japanese Patent No. 25530, a prism array having a saw-tooth cross section is known.
【０００５】[0005]
【発明が解決しようとする課題】このようなプリズムア
レイ型の導光板は反射部が平面であるため、図２２に示
すように、入射光は反射部への入射角度に応じて一定の
角度で反射され、ＬＣＤはプリズム毎に局所的に強く照
射されることになる。したがって、視覚的に照射部分の
明暗が強く、ＬＣＤの表示が見にくくなる。また、ＬＣ
Ｄを照射する縞状の強い光は、ＬＣＤの表面で反射され
て導光板自体を明るくするため、ＬＣＤの表示が視覚的
に不鮮明な状態を作る。In such a prism array type light guide plate, since the reflecting portion is a flat surface, as shown in FIG. 22, incident light is formed at a constant angle in accordance with the incident angle to the reflecting portion. Reflected, the LCD will be locally strongly illuminated for each prism. Therefore, the brightness of the illuminated portion is visually strong, making it difficult to see the display on the LCD. Also, LC
The strong striped light irradiating D is reflected on the surface of the LCD to brighten the light guide plate itself, thereby creating a visually unclear display on the LCD.
【０００６】ここで、従来の導光板は、透明な樹脂（た
とえばアクリル系樹脂）を用いた射出成形で金型の形状
を転写することにより製造しており、反射面を精度よく
形成するためには極めて微細な転写精度が要求される。
そして、射出成形に使用される熱可塑性の樹脂は金型に
接触すると冷えて硬化するので、微細転写性が悪く、高
精度に反射面を形成することが困難な場合がある。Here, the conventional light guide plate is manufactured by transferring the shape of a mold by injection molding using a transparent resin (for example, an acrylic resin). Requires extremely fine transfer accuracy.
The thermoplastic resin used for injection molding cools and hardens when it comes into contact with the mold, so that the fine transferability is poor and it may be difficult to form the reflective surface with high accuracy.
【０００７】また、このように導光板が樹脂で形成され
ているために透明度が低くなり、図２３に示すように、
光の減衰が多くなる。すると、ＬＣＤが十分な明るさで
照明されずに暗く見えてしまう。あるいは、このような
導光板によりＬＣＤを十分な明るさで照明しようとする
と、大光量の光源を用いなければならない。[0007] Further, since the light guide plate is formed of a resin as described above, the transparency is reduced, and as shown in FIG.
Light attenuation increases. Then, the LCD appears dark without being illuminated with sufficient brightness. Alternatively, in order to illuminate the LCD with sufficient brightness using such a light guide plate, a large amount of light source must be used.
【０００８】さらに、高温、高圧下で金型のキャビティ
内に樹脂を射出する射出成形においては金型の摩耗速度
が速いことから、反射面の寸法精度を安定的に維持する
ことは極めて困難である。Further, in injection molding in which a resin is injected into a cavity of a mold at high temperature and high pressure, it is extremely difficult to stably maintain the dimensional accuracy of the reflecting surface because of the high wear rate of the mold. is there.
【０００９】そして、成形過程で微細な透明状の異物が
樹脂内に混入したまま射出成形を行うと、導光板内の当
該異物が光により輝いて視認性を悪化させてしまう。If the injection molding is performed while fine transparent foreign matters are mixed in the resin during the molding process, the foreign matters in the light guide plate are shined by light to deteriorate visibility.
【００１０】そこで、本発明は、明暗を作ることなく表
示部を照射することのできる導光板に関する技術を提供
することを目的とする。Accordingly, an object of the present invention is to provide a technology relating to a light guide plate capable of irradiating a display unit without making light and dark.
【００１１】また、本発明は、反射面を精度よく形成す
ることのできる導光板に関する技術を提供することを目
的とする。Another object of the present invention is to provide a technique relating to a light guide plate capable of accurately forming a reflection surface.
【００１２】さらに、本発明は、光の減衰の少ない導光
板に関する技術を提供することを目的とする。Still another object of the present invention is to provide a technique relating to a light guide plate with little light attenuation.
【００１３】さらに、本発明は、反射面の寸法精度を安
定的に維持できる導光板に関する技術を提供することを
目的とする。Another object of the present invention is to provide a technique relating to a light guide plate capable of stably maintaining the dimensional accuracy of the reflection surface.
【００１４】そして、本発明は、混入異物による視認性
悪化を防止することのできる導光板に関する技術を提供
することを目的とする。It is another object of the present invention to provide a technique relating to a light guide plate capable of preventing the visibility from being deteriorated due to the contaminating foreign matter.
【００１５】[0015]
【課題を解決するための手段】上記課題を解決するた
め、本発明に係る導光板は、入光端面から入射された光
を反射面で反射して反射面の反対側において平坦に形成
された出射面から出射する導光板であって、反射面は、
光の入射方向と交差する方向に沿って延びる谷線と稜線
とにより交互に形成された湾曲面部と平面部とからな
り、湾曲面部は、導光板の厚さ方向に凸状の湾曲した面
が形成されて湾曲した反射凹面で入射光を反射すること
を特徴とする。In order to solve the above problems, a light guide plate according to the present invention is formed such that light incident from a light incident end face is reflected by a reflection surface and is formed flat on the opposite side of the reflection surface. A light guide plate for emitting light from the emission surface, wherein the reflection surface is
It consists of a curved surface portion and a flat portion alternately formed by valley lines and ridge lines extending along a direction intersecting the light incident direction, and the curved surface portion has a curved surface convex in the thickness direction of the light guide plate. The incident light is reflected by the formed curved concave concave surface.
【００１６】これによれば、導光板の厚さ方向に湾曲し
て形成された湾曲面部の反射凹面で入射光を反射してい
るので、反射光を拡散して表示部を照射することができ
るため、照射部分への強い照射によって発生する視覚的
な強い明暗を抑制することが可能になる。According to this, since the incident light is reflected by the reflection concave surface of the curved surface portion curved and formed in the thickness direction of the light guide plate, the reflected light can be diffused to irradiate the display section. For this reason, it is possible to suppress visually intense light and dark generated due to strong irradiation on the irradiation part.
【００１７】また、本発明に係る導光板の製造方法は、
反射面の反転形状が形成された形状転写部材の上に透明
性を有する液体状の樹脂を塗布し、樹脂の上に透明性を
有する平坦なガラス板を載置し、樹脂を硬化させ、樹脂
硬化後に形状転写部材を離脱させてガラス板と樹脂とか
らなる導光板を得ることを特徴とする。Further, the method for manufacturing a light guide plate according to the present invention comprises:
A transparent liquid resin is applied on the shape transfer member on which the inverted shape of the reflection surface is formed, a flat glass plate having transparency is placed on the resin, and the resin is cured. After curing, the shape transfer member is detached to obtain a light guide plate made of a glass plate and a resin.
【００１８】これによれば、樹脂が液状のときに形状転
写部材の微細形状が反射面を形成する樹脂側に転写され
るので、高い寸法精度の導光板を容易に製造することが
可能になる。According to this, when the resin is in a liquid state, the fine shape of the shape transfer member is transferred to the resin forming the reflection surface, so that a light guide plate having high dimensional accuracy can be easily manufactured. .
【００１９】また、ガラス板は樹脂と比較して光の透過
性がよいので、光の減衰の少ない導光板を得ることが可
能になる。Further, since the glass plate has better light transmittance than resin, it is possible to obtain a light guide plate with less light attenuation.
【００２０】さらに、樹脂と形状転写部材とを接合して
形状転写を行っているので、形状転写部材の摩耗速度が
遅くなり、反射面の寸法精度を安定的に維持することが
可能になる。Further, since the shape transfer is performed by joining the resin and the shape transfer member, the wear speed of the shape transfer member is reduced, and the dimensional accuracy of the reflection surface can be stably maintained.
【００２１】そして、樹脂内に混入した透明状の異物は
液状の樹脂に同化してしまうので、導光板での混入異物
による視認性悪化を防止することが可能になる。Since the transparent foreign matter mixed into the resin is assimilated into the liquid resin, it is possible to prevent the visibility from being deteriorated by the foreign matter mixed in the light guide plate.
【００２２】[0022]
【発明の実施の形態】本発明の請求項１に記載の発明
は、入光端面から入射された光を反射面で反射して反射
面の反対側において平坦に形成された出射面から出射す
る導光板であって、反射面は、光の入射方向と交差する
方向に沿って延びる谷線と稜線とにより交互に形成され
た湾曲面部と平面部とからなり、湾曲面部は、導光板の
厚さ方向に凸状の湾曲した面が形成されて湾曲した反射
凹面で入射光を反射することを特徴とする導光板であ
り、反射光を拡散して表示部を照射することが可能にな
るという作用を有し、照射部分への強い照射による視覚
的な強い明暗を抑制することができる。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the first aspect of the present invention, light incident from a light incident end face is reflected by a reflection surface and emitted from an emission surface formed flat on the opposite side of the reflection surface. The light guide plate, wherein the reflection surface is composed of a curved surface portion and a flat portion alternately formed by valley lines and ridge lines extending along a direction intersecting the light incident direction, and the curved surface portion has a thickness of the light guide plate. The light guide plate is characterized in that a convex curved surface is formed in the vertical direction and the incident light is reflected by the curved reflective concave surface, and it is possible to irradiate the display unit by diffusing the reflected light. It has an effect, and it is possible to suppress strong light and darkness caused by strong irradiation of the irradiation part.
【００２３】本発明の請求項２に記載の発明は、請求項
１記載の発明において、湾曲面部の曲率中心は、反射面
の複数の谷線を含む第１の仮想平面よりも出射面側に位
置することを特徴とする導光板であり、反射光を拡散し
て表示部を照射することが可能になるという作用を有
し、照射部分への強い照射による視覚的な強い明暗を抑
制することができる。According to a second aspect of the present invention, in the first aspect of the present invention, the center of curvature of the curved surface portion is closer to the emission surface side than the first virtual plane including the plurality of valleys of the reflection surface. It is a light guide plate characterized by being located, has the function of diffusing the reflected light and irradiating the display unit, and suppresses the strong light and darkness caused by the strong irradiation of the irradiation part. Can be.
【００２４】本発明の請求項３に記載の発明は、請求項
１または２記載の発明において、反射面の複数の谷線を
含む第１の仮想平面と、この第１の仮想平面と交差する
湾曲面部の位置および湾曲面部の曲率中心を含む第２の
仮想平面とでなす入光端面側の鋭角である端部角は、入
射光に対する略臨界角以上とされていることを特徴とす
る導光板であり、入射光が全反射するので、出射面から
の出射光量を十分に確保することが可能になるという作
用を有する。According to a third aspect of the present invention, in the first or second aspect, a first virtual plane including a plurality of valleys of the reflecting surface intersects the first virtual plane. An acute end angle between the position of the curved surface portion and the second virtual plane including the center of curvature of the curved surface portion, which is an acute angle on the light incident end surface side, is substantially equal to or greater than a critical angle with respect to incident light. Since this is a light plate, since incident light is totally reflected, it has an effect that it is possible to sufficiently secure the amount of light emitted from the emission surface.
【００２５】本発明の請求項４に記載の発明は、請求項
１〜３の何れか一項に記載の発明において、湾曲面部の
曲率半径は２５〜２５０μｍであることを特徴とする導
光板であり、反射光を拡散して表示部を照射することが
可能になるという作用を有し、照射部分への強い照射に
よる視覚的な強い明暗を抑制することができる。According to a fourth aspect of the present invention, in the light guide plate according to any one of the first to third aspects, the radius of curvature of the curved surface portion is 25 to 250 μm. There is an effect that it is possible to irradiate the display unit by diffusing the reflected light, and it is possible to suppress a visually strong light and dark caused by strong irradiation to the irradiation part.
【００２６】本発明の請求項５に記載の発明は、請求項
１〜４の何れか一項に記載の発明において、湾曲面部で
反射した光の焦点位置は、導光板の厚さの反射面寄り１
／３以下であることを特徴とする導光板であり、反射光
を拡散して表示部を照射することが可能になるという作
用を有し、照射部分への強い照射による視覚的な強い明
暗を抑制することができる。According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, the focal position of the light reflected by the curved surface portion is a reflection surface having a thickness of the light guide plate. Leaning 1
/ 3 or less, which has the effect of diffusing the reflected light and irradiating the display unit, and providing a strong visual contrast due to the strong irradiation of the irradiated part. Can be suppressed.
【００２７】本発明の請求項６に記載の発明は、請求項
１〜５の何れか一項に記載の発明において、湾曲面部の
間隔は入射端面の高さの１／３〜１／５であることを特
徴とする導光板であり、反射光を拡散して表示部を照射
することが可能になるという作用を有し、照射部分への
強い照射による視覚的な強い明暗を抑制することができ
る。According to a sixth aspect of the present invention, in the invention according to any one of the first to fifth aspects, the interval between the curved surface portions is 1/3 to 1/5 of the height of the incident end face. It is a light guide plate characterized by having the function of diffusing reflected light and irradiating the display unit, and suppressing the strong light and darkness caused by strong irradiation on the irradiated part. it can.
【００２８】本発明の請求項７に記載の発明は、請求項
１〜６の何れか一項に記載の発明において、湾曲面部の
間隔とこの湾曲面部で反射した反射光の出射面における
拡散間隔とが近似または略等しいことを特徴とする導光
板であり、出射面全体からほぼ均一の出射光を出射する
ことができるという作用を有し、これにより、視覚的に
明るさの偏りのないＬＣＤ用の導光板を提供することが
できる。According to a seventh aspect of the present invention, in the first aspect of the present invention, the interval between the curved surface portions and the diffusion interval of the light reflected by the curved surface portion on the exit surface. Are approximately or substantially equal to each other, and have the function of emitting substantially uniform outgoing light from the entire outgoing surface. Light guide plate can be provided.
【００２９】本発明の請求項８に記載の発明は、請求項
１〜７の何れか一項に記載の発明において、反射面の高
さは、入光端面の高さの１／５０〜１／１５０であるこ
とを特徴とする導光板であり、入射面と反対側の反射光
量が不足することなく表示部を表示することができると
いう作用を有し、全体的に照射することができるＬＣＤ
用の導光板を提供することができる。According to an eighth aspect of the present invention, in the invention according to any one of the first to seventh aspects, the height of the reflecting surface is 1/50 to 1/100 of the height of the light incident end face. / 150, which is a light guide plate characterized by being capable of displaying a display portion without a shortage of reflected light on the side opposite to the incident surface, and capable of irradiating the entire LCD.
Light guide plate can be provided.
【００３０】本発明の請求項９に記載の発明は、請求項
１〜７の何れか一項に記載の発明において、反射面の高
さは１５μｍ以下であることを特徴とする導光板であ
り、目視による段差が気にならない程度の反射面で反射
光を拡散して表示部を表示することが可能になるという
作用を有する。According to a ninth aspect of the present invention, there is provided the light guide plate according to any one of the first to seventh aspects, wherein the height of the reflection surface is 15 μm or less. In addition, there is an effect that it is possible to diffuse the reflected light on the reflection surface to such an extent that the step difference due to visual observation is not bothersome and to display the display unit.
【００３１】本発明の請求項１０に記載の発明は、請求
項１〜９の何れか一項に記載の発明において、透明性を
有するガラス板からなり出射面を備えた基板層と、基板
層と一体的に形成され、透明性を有する樹脂からなり反
射面を備えた樹脂層とから構成されていることを特徴と
する導光板であり、ガラス板は樹脂と比較して光の透過
性がよいので、光の減衰の少ない導光板を得ることが可
能になるという作用を有する。According to a tenth aspect of the present invention, there is provided the invention as set forth in any one of the first to ninth aspects, wherein the substrate layer is made of a transparent glass plate and has an emission surface; And a resin layer formed of a transparent resin and having a reflective surface.The light guide plate is characterized by having a light transmittance higher than that of the resin. Since it is good, it has an effect that it is possible to obtain a light guide plate with little light attenuation.
【００３２】本発明の請求項１１に記載の発明は、入光
端面から入射された光を反射面で反射して反射面の反対
側において平坦に形成された出射面から出射する導光板
であって、透明性を有するガラス板からなり出射面を備
えた基板層と、基板層と一体的に形成され、透明性を有
する樹脂からなり反射面を備えた樹脂層とから構成され
ていることを特徴とする導光板であり、ガラス板は樹脂
と比較して光の透過性がよいので、光の減衰の少ない導
光板を得ることが可能になるという作用を有する。According to an eleventh aspect of the present invention, there is provided a light guide plate for reflecting light incident from a light incident end face on a reflection face and emitting the light from a flat emission face on the opposite side of the reflection face. And a substrate layer made of a transparent glass plate and having an emission surface, and a resin layer formed integrally with the substrate layer and made of a transparent resin and having a reflection surface. A light guide plate characterized by the fact that a glass plate has a higher light transmittance than a resin, and thus has an effect that a light guide plate with less light attenuation can be obtained.
【００３３】本発明の請求項１２に記載の発明は、請求
項１０または１１記載の発明において、基板層の厚さは
０．５〜１．０ｍｍ、樹脂層の厚さは２０〜５０μｍで
あることを特徴とする導光板であり、光の減衰の少ない
導光板を得ることが可能になるという作用を有する。According to a twelfth aspect of the present invention, in the tenth or eleventh aspect, the thickness of the substrate layer is 0.5 to 1.0 mm, and the thickness of the resin layer is 20 to 50 μm. This is a light guide plate characterized by the fact that a light guide plate with reduced light attenuation can be obtained.
【００３４】本発明の請求項１３に記載の発明は、光源
と、光源からの光が入光端面から入光され、反射面で反
射して出射面から出射する請求項１〜１２の何れか一項
に記載の導光板と、導光板の出射光により照明される表
示部とを有することを特徴とするディスプレイ装置であ
り、反射光を拡散して表示部を照明することが可能にな
るという作用を有し、照射部分への強い照射による視覚
的な強い明暗を抑制することができる。According to a thirteenth aspect of the present invention, in any one of the first to twelfth aspects, the light source and the light from the light source enter from the light incident end face, are reflected by the reflection face, and are emitted from the emission face. A display device comprising: the light guide plate according to claim 1; and a display unit illuminated by light emitted from the light guide plate, wherein the display unit can be illuminated by diffusing reflected light. It has an effect, and it is possible to suppress strong light and darkness caused by strong irradiation of the irradiation part.
【００３５】本発明の請求項１４に記載の発明は、請求
項１３記載のディスプレイ装置が用いられていることを
特徴とする電子装置であり、反射光を拡散して表示部を
照射することが可能になるという作用を有し、照射部分
への強い照射による視覚的な強い明暗を抑制することが
できる。According to a fourteenth aspect of the present invention, there is provided an electronic device using the display device according to the thirteenth aspect, wherein the display device is illuminated by diffusing reflected light. This has the effect of making it possible, and can suppress strong light and darkness caused by strong irradiation of the irradiation part.
【００３６】本発明の請求項１５に記載の発明は、請求
項１０、１１または１２記載の導光板の製造方法であっ
て、反射面の反転形状が形成された形状転写部材の上に
透明性を有する液体状の樹脂を塗布し、樹脂の上に透明
性を有する平坦なガラス板を載置し、樹脂を硬化させ、
樹脂硬化後に形状転写部材を離脱させてガラス板と樹脂
とからなる導光板を得ることを特徴とする導光板の製造
方法であり、高い寸法精度の導光板を容易に製造するこ
とが可能になり、光の減衰の少ない導光板を得ることが
可能になり、反射面の寸法精度を安定的に維持すること
が可能になり、導光板での混入異物による視認性悪化を
防止することが可能になるという作用を有する。According to a fifteenth aspect of the present invention, there is provided the method for manufacturing a light guide plate according to the tenth, eleventh or twelfth aspect, wherein a transparent surface is formed on the shape transfer member on which the inverted shape of the reflection surface is formed. Apply a liquid resin having a, place a flat glass plate having transparency on the resin, and cure the resin,
A light guide plate manufacturing method characterized in that a shape transfer member is detached after resin curing to obtain a light guide plate made of a glass plate and a resin, and a light guide plate with high dimensional accuracy can be easily manufactured. , It is possible to obtain a light guide plate with little light attenuation, it is possible to stably maintain the dimensional accuracy of the reflection surface, and it is possible to prevent the visibility from being deteriorated by foreign substances mixed in the light guide plate. It has the effect of becoming.
【００３７】本発明の請求項１６に記載の発明は、請求
項１０、１１または１２記載の導光板の製造方法であっ
て、透明性を有する平坦なガラス板の上に透明性を有す
る液体状の樹脂を塗布し、樹脂の上に反射面の反転形状
が形成された形状転写部材を載置し、樹脂を硬化させ、
樹脂硬化後に形状転写部材を離脱させてガラス板と樹脂
とからなる導光板を得ることを特徴とする導光板の製造
方法であり、高い寸法精度の導光板を容易に製造するこ
とが可能になり、光の減衰の少ない導光板を得ることが
可能になり、反射面の寸法精度を安定的に維持すること
が可能になり、導光板での混入異物による視認性悪化を
防止することが可能になるという作用を有する。According to a sixteenth aspect of the present invention, there is provided the method for manufacturing a light guide plate according to the tenth, eleventh or twelfth aspect, wherein the transparent liquid state is formed on a transparent flat glass plate. The resin is applied, and a shape transfer member on which the inverted shape of the reflection surface is formed is placed on the resin, and the resin is cured,
A light guide plate manufacturing method characterized in that a shape transfer member is detached after resin curing to obtain a light guide plate made of a glass plate and a resin, and a light guide plate with high dimensional accuracy can be easily manufactured. , It is possible to obtain a light guide plate with little light attenuation, it is possible to stably maintain the dimensional accuracy of the reflection surface, and it is possible to prevent the visibility from being deteriorated by foreign substances mixed in the light guide plate. It has the effect of becoming.
【００３８】本発明の請求項１７に記載の発明は、請求
項１５または１６記載の発明において、樹脂には、所定
の波長の光を照射すると硬化する光硬化性樹脂を用い、
ガラス板側から光を照射して樹脂を硬化させることを特
徴とする導光板の製造方法であり、高い寸法精度の導光
板を容易に製造することが可能になり、光の減衰の少な
い導光板を得ることが可能になり、反射面の寸法精度を
安定的に維持することが可能になり、導光板での混入異
物による視認性悪化を防止することが可能になるという
作用を有する。According to a seventeenth aspect of the present invention, in the invention according to the fifteenth or sixteenth aspect, a photocurable resin that cures when irradiated with light having a predetermined wavelength is used.
A method for manufacturing a light guide plate, which comprises irradiating light from the glass plate side to cure a resin, which makes it possible to easily manufacture a light guide plate with high dimensional accuracy and to reduce light attenuation. Can be obtained, the dimensional accuracy of the reflecting surface can be stably maintained, and the visibility can be prevented from deteriorating due to the foreign matter mixed in the light guide plate.
【００３９】本発明の請求項１８に記載の発明は、請求
項１７記載の発明において、樹脂には、紫外光を照射す
ると硬化する紫外線硬化性樹脂を用い、ガラス板側から
紫外線を照射して樹脂を硬化させることを特徴とする導
光板の製造方法であり、高い寸法精度の導光板を容易に
製造することが可能になり、光の減衰の少ない導光板を
得ることが可能になり、反射面の寸法精度を安定的に維
持することが可能になり、導光板での混入異物による視
認性悪化を防止することが可能になるという作用を有す
る。According to an eighteenth aspect of the present invention, in the invention according to the seventeenth aspect, an ultraviolet-curable resin that cures when irradiated with ultraviolet light is used as the resin, and ultraviolet rays are irradiated from the glass plate side. This is a method for manufacturing a light guide plate characterized by curing a resin, which makes it possible to easily manufacture a light guide plate with high dimensional accuracy, to obtain a light guide plate with less light attenuation, and to achieve reflection. This has the effect that the dimensional accuracy of the surface can be stably maintained, and the visibility can be prevented from deteriorating due to foreign matter mixed in the light guide plate.
【００４０】以下、本発明の実施の形態を、図面を参照
しつつさらに具体的に説明する。ここで、添付図面にお
いて同一の部材には同一の符号を付しており、また、重
複した説明は省略されている。なお、発明の実施の形態
は、本発明が実施される特に有用な形態としてのもので
あり、本発明がその実施の形態に限定されるものではな
い。Hereinafter, embodiments of the present invention will be described more specifically with reference to the drawings. Here, in the accompanying drawings, the same members are denoted by the same reference numerals, and duplicate description is omitted. The embodiments of the present invention are particularly useful forms in which the present invention is implemented, and the present invention is not limited to the embodiments.
【００４１】図１は本発明の一実施の形態である導光板
が用いられたディスプレイ装置を示す分解斜視図、図２
は図１のディスプレイ装置のII−II線に沿った断面図、
図３は本発明の一実施の形態である導光板の要部を示す
第１の説明図、図４は湾曲面部を所定の曲率半径に設定
した場合における本実施の形態の導光板の要部を示す説
明図、図５は湾曲面部の曲率半径を図４に示す例より大
きくした場合における本実施の形態の導光板の要部を示
す説明図、図６は湾曲面部の曲率半径を図５に示す例よ
り大きくした場合における本実施の形態の導光板の要部
を示す説明図、図７は図４〜図６の導光板に対する入射
光の一例を示す説明図、図８は図４の導光板に図７の入
射光を取り込んだ場合における反射光の光路を示す説明
図、図９は図８の導光板において複数の湾曲面部におけ
る反射光の光路を示す説明図、図１０は図５の導光板に
図７の入射光を取り込んだ場合における反射光の光路を
示す説明図、図１１は図１０の導光板において複数の湾
曲面部における反射光の光路を示す説明図、図１２は図
６の導光板に図７の入射光を取り込んだ場合における反
射光の光路を示す説明図、図１３は図１２の導光板にお
いて複数の湾曲面部における反射光の光路を示す説明
図、図１４は本発明の一実施の形態である導光板の要部
を示す第２の説明図、図１５は本発明の一実施の形態で
ある導光板の要部を示す第３の説明図、図１６〜図２０
は本発明の一実施の形態である導光板の製造方法を連続
して示す説明図、図２１は本発明の一実施の形態である
導光板における光の減衰状態を示す説明図である。FIG. 1 is an exploded perspective view showing a display device using a light guide plate according to an embodiment of the present invention.
Is a cross-sectional view of the display device of FIG. 1 along the line II-II,
FIG. 3 is a first explanatory view showing a main part of a light guide plate according to an embodiment of the present invention, and FIG. 4 is a main part of the light guide plate of the present embodiment when a curved surface portion is set to a predetermined radius of curvature. FIG. 5 is an explanatory view showing a main part of the light guide plate of the present embodiment when the radius of curvature of the curved surface is larger than that of the example shown in FIG. 4, and FIG. 6 is a diagram showing the radius of curvature of the curved surface. FIG. 7 is an explanatory view showing an essential part of the light guide plate of the present embodiment when it is larger than the example shown in FIG. 7, FIG. 7 is an explanatory view showing an example of light incident on the light guide plate in FIGS. 4 to 6, and FIG. FIG. 9 is an explanatory view showing an optical path of reflected light when the incident light of FIG. 7 is taken into the light guide plate, FIG. 9 is an explanatory view showing an optical path of reflected light at a plurality of curved surfaces in the light guide plate of FIG. 8, and FIG. FIG. 1 is an explanatory view showing an optical path of reflected light when the incident light of FIG. 7 is taken into the light guide plate of FIG. FIG. 12 is an explanatory view showing an optical path of reflected light on a plurality of curved surfaces in the light guide plate of FIG. 10; FIG. 12 is an explanatory view showing an optical path of reflected light when the incident light of FIG. 7 is taken into the light guide plate of FIG. 6; 13 is an explanatory view showing the optical path of the reflected light at the plurality of curved surfaces in the light guide plate of FIG. 12, FIG. 14 is a second explanatory view showing the main part of the light guide plate according to one embodiment of the present invention, and FIG. Third explanatory view showing a main part of a light guide plate according to an embodiment of the present invention, FIGS.
FIG. 21 is an explanatory view showing a method of manufacturing a light guide plate according to an embodiment of the present invention continuously, and FIG. 21 is an explanatory view showing a light attenuation state in the light guide plate according to an embodiment of the present invention.
【００４２】図１に示すように、本実施の形態のディス
プレイ装置１０は、たとえば携帯電話などの電子装置の
表示用として用いられるもので、ＬＥＤなどの光源１１
と、この光源１１から出射した光をプリズム面で反射し
て線状の発光面を形成する線状導光体１２と、線状導光
体１２からの光が入光端面１３ａから入射され、反射面
１３ｂで反射して出射面１３ｃから出射する導光板１３
と、この導光板１３の出射光により照明されるＬＣＤ
（表示部）１４とを備えている。また、線状発光体１２
の導光板１３と反対側には、発光面の発光効率を向上さ
せる反射板１５が配置されている。As shown in FIG. 1, a display device 10 according to the present embodiment is used for displaying an electronic device such as a mobile phone, for example.
A linear light guide 12 that reflects light emitted from the light source 11 on a prism surface to form a linear light emitting surface, and light from the linear light guide 12 is incident from a light incident end face 13a, Light guide plate 13 reflected by reflection surface 13b and emitted from emission surface 13c
And an LCD illuminated by the light emitted from the light guide plate 13
(Display unit) 14. In addition, the linear illuminant 12
On the side opposite to the light guide plate 13, a reflection plate 15 for improving the luminous efficiency of the light emitting surface is arranged.
【００４３】なお、本実施の形態において、光源１１に
はＬＥＤが用いられているが、ＬＥＤ以外のものを用い
てもよい。また、本実施の形態では、光源１１からの光
が線状発光体１２を介して導光板１３に入光している
が、線状発光体１２を用いることなく、光源１１からの
光が直接導光板１３に入光する構造としてもよい。さら
に、線状発光体１２を用いた場合であっても、反射板１
５は省略することができる。In this embodiment, an LED is used as the light source 11, but a light source other than the LED may be used. Further, in the present embodiment, the light from the light source 11 enters the light guide plate 13 via the linear light-emitting body 12, but the light from the light source 11 is directly used without using the linear light-emitting body 12. The light guide plate 13 may be configured to enter the light. Further, even when the linear illuminant 12 is used, the reflection plate 1
5 can be omitted.
【００４４】このようなディスプレイ装置１０におい
て、図２に示すように、導光板１３より照射される光に
よりＬＣＤ１４が照明され、暗部などにおけるＬＣＤ１
４の視認性の向上が図られている。In such a display device 10, as shown in FIG. 2, the LCD 14 is illuminated by the light emitted from the light guide plate 13, and the LCD 1 in a dark area or the like is illuminated.
4 is improved in visibility.
【００４５】前述のように、導光板１３は、入光端面１
３ａから入射された光を反射する反射面１３ｂと、反射
面１３ｂの反対側において平坦に形成された出射面１３
ｃとから構成されている。そして、図２および図３に示
すように、反射面１３ｂは、光の入射方向と交差する方
向に沿って延びる谷線と稜線とにより交互に形成された
湾曲面部１３ｂ１ と平面部１３ｂ２ とからなる。そし
て、湾曲面部１３ｂ１は、導光板１３の厚さ方向に凸状
の湾曲した面が形成されたものからなり、湾曲した反射
凹面で入射光を反射する。As described above, the light guide plate 13 has the light incident end face 1.
A reflecting surface 13b for reflecting light incident from the reflecting surface 3a, and an emitting surface 13 formed flat on the opposite side to the reflecting surface 13b.
c. As shown in FIGS. 2 and 3, the reflecting surface 13 b includes a curved surface portion 13 b1 and a flat portion 13 b2 alternately formed by valley lines and ridge lines extending along a direction intersecting with the light incident direction. Consists of The curved part 13b1 is made from those curved surface thickness direction convex of the light guide plate 13 is formed to reflect incident light in a curved reflective concave.
【００４６】そして、湾曲面部１３ｂ１ は、図３の一
点鎖線で示す湾曲面部１３ｂ１ に対する複数の垂線の
交点である湾曲面部１３ｂ１ の曲率中心Ｃ、および矢
印で示す反射光の焦点ｆを有している。[0046] Then, the curved surface portion 13b1 is closed the center of curvature C of the curved surface portion 13b1, which is an intersection of a plurality of the normal to the curved surface portion 13b1 indicated by a chain line in FIG. 3, and the focal point f of the reflected light shown by the arrow are doing.
【００４７】ここで、湾曲面部１３ｂ１ を所定の曲率
半径に設定した導光板１３を図４に、湾曲面部１３ｂ１
の曲率半径を図４に示す例より大きくした導光板１３
を図５に、湾曲面部１３ｂ１ の曲率半径を図５に示す
例より大きくした導光板１３を図６に示す。これらの図
に示すように、曲率半径が大きくなるほど曲率中心Ｃお
よび焦点ｆは湾曲面部１３ｂ１ から遠くなる。曲率半
径は、図４に示す場合においては２５μｍ、図５に示す
場合においては１００μｍ、図６に示す場合においては
２５０μｍとされている。また、後述する中心角θは何
れも４５°、導光板１３の厚さは何れも０．８ｍｍとさ
れている。[0047] Here, a curved surface portion 13b1 a predetermined curvature light guide plate 13 is set to a radius in Figure 4, the curved surface portions 13b1
Light guide plate 13 having a larger radius of curvature than the example shown in FIG.
Figure 5 shows a curved surface portion 13b light guide plate 13 is made larger than the example in which the radius of curvature shown in FIG. 5 of1 in FIG. As shown in these figures, the center of curvature C and focal point f as the radius of curvature becomes larger the distance from the curved surface portion 13b1. The radius of curvature is 25 μm in the case shown in FIG. 4, 100 μm in the case shown in FIG. 5, and 250 μm in the case shown in FIG. Further, the center angle θ described later is 45 ° in all cases, and the thickness of the light guide plate 13 is 0.8 mm in all cases.
【００４８】これらの導光板１３に、出射面１３ｃと水
平方向に対して±３°の入射光（図７）を取り込んだ場
合における反射光の光路を図８〜図１３に示す。FIGS. 8 to 13 show the optical paths of the reflected light when the light guide plate 13 receives the incident light (FIG. 7) of ± 3 ° with respect to the horizontal direction with respect to the light exit surface 13c.
【００４９】図４に示す導光板１３の場合の反射光の光
路は、図８および図９に示すように、焦点ｆが湾曲面部
１３ｂ１ に接近しているために反射光が大きく拡散さ
れて相互にオーバーラップする。但し、ＬＣＤ１４はそ
の特有の有効照射角の範囲内で照射されることが必要で
ある。すなわち、反射光が過度に拡散されるとＬＣＤ１
４への有効照射光量が減少することになるため、使用す
るＬＣＤ１４が有する有効照射角の範囲に合せた曲率半
径にすることが好ましい。特にＤＳＴＮ等は有効照射角
の範囲が狭いので、これを十分考慮する。The optical path of the reflected light when the light guide plate 13 shown in FIG. 4, as shown in FIGS. 8 and 9, the reflected light is diffused largely in order to focus f is close to the curved surface portion 13b1 Overlap each other. However, the LCD 14 needs to be irradiated within the range of its specific effective irradiation angle. That is, if the reflected light is excessively diffused, the LCD 1
Since the effective irradiation light amount to the LCD 4 decreases, it is preferable to set the radius of curvature to a range of the effective irradiation angle of the LCD 14 to be used. In particular, DSTN and the like have a narrow effective irradiation angle range, and this should be sufficiently considered.
【００５０】次に、図５に示す導光板１３の場合の反射
光の光路は、図１０および図１１に示すように、焦点ｆ
は図４の導光板１３の場合よりも湾曲面部１３ｂ１ か
ら離れているものの反射光は拡散され相互に隣接し、導
光板１３の全面に照射している。そのため、ＬＣＤ１４
全体を照明することができる。Next, the optical path of the reflected light in the case of the light guide plate 13 shown in FIG. 5 is, as shown in FIGS.
The reflected light which is away from the curved surface portion 13b1 than the light guide plate 13 in FIG. 4 are adjacent to each other are spread, and irradiating the entire surface of the light guide plate 13. Therefore, the LCD 14
The whole can be illuminated.
【００５１】そして、図６に示す導光板１３の場合の反
射光の光路は、図１２および図１３に示すように、焦点
ｆは湾曲面部１３ｂ１ から大きく離れているため、上
述の図５の導光板１３よりも反射光の拡散が少なくなる
が、反射面が平面の場合に比べるとかなり広い範囲の照
射面を作ることができる。したがって、反射面が平面の
場合に比べて、照射部分への強い照射による視覚的な強
い明暗が抑制されることになる。[0051] Then, the optical path of the reflected light when the light guide plate 13 shown in FIG. 6, as shown in FIGS. 12 and 13, since the focus f largely apart from the curved surface portion 13b1, the above-described FIG. 5 Although the diffusion of the reflected light is smaller than that of the light guide plate 13, it is possible to form an irradiation surface in a considerably wider range than when the reflection surface is a flat surface. Therefore, as compared with the case where the reflection surface is a flat surface, visually strong light and dark caused by strong irradiation to the irradiation part is suppressed.
【００５２】なお、図１４において、湾曲面部１３ｂ１
の曲率中心Ｃは、反射面１３ｂの複数の谷線を含む第
１の仮想平面ｂよりも出射面１３ｃ側に位置した場合に
は、特に反射光が過度に拡散されてＬＣＤ１４が有する
有効照射角を超えて照射するため、ＬＣＤ１４への有効
照射光量が減少することになる。In FIG. 14, the curved surface portion 13b1
Is located closer to the emission surface 13c than the first virtual plane b including the plurality of valleys of the reflection surface 13b, the reflected light is excessively diffused, and the effective irradiation angle of the LCD 14 is particularly large. , The effective irradiation light amount to the LCD 14 is reduced.
【００５３】また、反射面１３ｂの複数の谷線を含む第
１の仮想平面ｂと、この第１の仮想平面ｂと交差する湾
曲面部１３ｂ１ の位置およびこの湾曲面部１３ｂ１ の
曲率中心Ｃを含む第２の仮想平面ｌとでなす入光端面１
３ａ側の鋭角である端部角θ１ は、入射光角度に対し
ておおよそ臨界角以上とすることが望ましい。これは、
端部角θ１ が反射面１３ｂを構成する部材の有する全
反射する角度より小さくなると入射光が湾曲面部１３ｂ
１ から出射するため、出射面１３ｃからの出射光量が
減少することになるからである。おな、入射光角度を±
ｘとした場合には、端部角θ１ は、部材の臨界角αと
ｘを加算した値となる。例えば、臨界角が４２°である
アクリル樹脂を用いて入射角±２°の光を入射させた場
合、端部角θ１ は４４°以上が適当である。但し、照
射特性に支障がない程度であれば、端部角θ１ がこの
角度よりも多少小さくても本発明の趣旨に何ら影響を及
ぼすものではない。Further, the reflection surface 13b includes a plurality of valley lines.
A first virtual plane b and a bay intersecting the first virtual plane b
Curved surface 13b1 And the curved surface portion 13b1 of
Light incident end face 1 formed by second virtual plane l including center of curvature C
End angle θ which is an acute angle on the 3a side1 Is relative to the incident light angle
Therefore, it is desirable that the angle is approximately equal to or larger than the critical angle. this is,
End angle θ1 Is the total of the members constituting the reflection surface 13b
When the angle is smaller than the angle of reflection, the incident light is curved.
1 From the exit surface 13c.
This is because it will decrease. The incident light angle is ±
x, the end angle θ1 Is the critical angle α of the member
It is a value obtained by adding x. For example, the critical angle is 42 °
When light with an incident angle of ± 2 ° is incident using acrylic resin
, End angle θ1 Is suitably 44 ° or more. However,
If there is no problem in the emission characteristics, the end angle θ1 But this
Even if it is slightly smaller than the angle, it has no effect on the gist of the present invention.
It is not a thing to lose.
【００５４】さらに、図８〜１３から分かるように、上
述のように焦点ｆが湾曲面部１３ｂから離れれば反射光
の拡散度合いは少なくなり、焦点ｆの位置は曲率中心Ｃ
が湾曲面部１３ｂ１ から遠くなれば、すなわち曲率半
径が大きくなれば、湾曲面部１３ｂ１ から離れる。そ
して、湾曲面部１３ｂ１ どうしの間隔が大きい場合に
は反射光の拡散を大きくし、間隔が小さい場合には反射
光の拡散を小さくすることにより、局所的に強く照射さ
れることによる視覚的な強い明暗を抑制するように、焦
点位置や曲率半径を調整することになる。拡散させる度
合いは導光板１３以外の要素に影響されるが、局所的な
照射による明暗が視覚的に目立たない程度の小さな拡散
からＬＣＤ１４の有効照射角度の範囲内となる程度の大
きな拡散までを目安に拡散させることが好ましい。Further, as can be seen from FIGS. 8 to 13, if the focal point f moves away from the curved surface portion 13b as described above, the degree of diffusion of the reflected light decreases, and the position of the focal point f becomes the center of curvature C
There if far from the curved surface portion 13b1, i.e. the larger the radius of curvature, away from the curved surface portion 13b1. By the greater the interval between the curved part 13b1 is the increased diffusion of the reflected light, reducing the diffusion of the reflected light and the gap is small, visual by a locally strongly irradiated The focal position and the radius of curvature are adjusted so as to suppress strong contrast. Although the degree of diffusion is affected by factors other than the light guide plate 13, the standard ranges from a small diffusion where the brightness due to local irradiation is not visually noticeable to a large diffusion where the brightness falls within the range of the effective irradiation angle of the LCD 14. Is preferably diffused.
【００５５】ここで、湾曲面１３ｂ１ 各々の拡散光が
出射面１３ｃより出射するときに相互に近隣もしくはオ
ーバーラップするように、望ましくは湾曲面部１３ｂ１
どうしの間隔Ｐと反射光の出射面１３ｃにおける拡散
間隔Ｐ１ とがおおよそ等しくなる程度に、湾曲面部１
３ｂ１ の間隔Ｐに応じて湾曲面部１３ｂ１ の曲率を設
定するようにすることでＬＣＤ１４全面に反射光を照射
することができ、明るさに偏りがなくなるため、照明さ
れているＬＣＤ１４が視覚的にさらに柔らかく、見やす
くなる。Here, the curved surface portions 13b1 are desirably arranged so as to be adjacent to or overlap each other when the diffused lights of the curved surfaces 13b1 are emitted from the emission surface 13c.
To the extent that if the pitch P of and the diffusion distance P1 at the exit surface 13c of the reflected light is roughly equal, the curved surface portion 1
3b be adapted to set the curvature of the curved surface portion 13b1 in can be irradiated with the reflected light to LCD 14 entirely in accordance with thefirst interval P, since there is no bias in brightness, LCD 14 is a visual that is illuminated Softer and easier to see.
【００５６】これらのことを考慮して、導光板１３の各
部の寸法は、例えば次のように規定することができる。In consideration of the above, the dimensions of each part of the light guide plate 13 can be defined as follows, for example.
【００５７】反射面１３ｂ１ の間隔Ｐは、干渉により
発生するモレア縞がでないように、導光板１３により照
射されるＬＣＤ１４の画素ピッチに合せることが望まし
い。また、該間隔Ｐが入射端面１３ａの高さの１／３〜
１／５になるように、入射端面１３ａの高さを設定する
ことが望ましい。これは、湾曲面部１３ｂ１ の間隔Ｐ
が入射端面１３ａの高さの１／３以上の場合には、入射
光が導光板１３の入光端面１３ａと反対面まで到達しに
くくなって導光板１３の入光端面１３ａの反対側が暗く
なるからであり、湾曲面部１３ｂ１ の間隔Ｐが入射端
面１３ａの高さの１／５以下の場合には、反射光量が少
なくなって導光板１３全体が暗くなるからである。[0057] interval P of the reflection surface 13b1 is to avoid being Morea fringes generated by the interference, it is desirable to match the pixel pitch of the LCD14 to be irradiated by the light guide plate 13. Further, the interval P is 1/3 of the height of the incident end face 13a.
It is desirable to set the height of the incident end face 13a so as to be 1/5. This interval P of the curved surface portion 13b1
Is greater than or equal to one-third of the height of the incident end face 13a, it is difficult for incident light to reach the light incident end face 13a of the light guide plate 13 and the opposite side of the light guide plate 13 from the light incident end face 13a becomes dark. it is from the interval P of the curved surface portion 13b1 is in the following cases: 1/5 of the height of the entrance end face 13a is because the whole light guide plate 13 reflection light amount becomes less dark.
【００５８】また、ＬＣＤ１４の大きさにより導光板１
３の長さ（入射光に沿った方向の寸法）と幅（入射光と
交差する方向の寸法）、および入射光の方向を決める。
なお、湾曲面部１３ｂ１ の総数Ｓは、（導光板１３の
長さ／湾曲面部１３ｂ１ の間隔Ｐ）により求められ
る。The light guide plate 1 depends on the size of the LCD 14.
3. Determine the length (dimension in the direction along the incident light) and width (dimension in the direction intersecting the incident light) and the direction of the incident light.
Incidentally, the total number S of the curved surface portion 13b1 is determined by the (interval P of length / curved parts 13b1 of the light guide plate 13).
【００５９】さらに、導光板１３の厚さと反射面１３ｂ
の高さＲＨ（第１の仮想平面ｂと第３の仮想平面ａとの
間隔）を設定する。ここで、反射面１３ｂの高さＲＨ
は、（入光端面１３ａの高さＨ／湾曲面部１３ｂ１ の
総数Ｓ×√２）となるように配慮する。なお、本発明者
の検討によれば、反射面１３ｂの高さＲＨは、この数式
においてプラス・マイナス２０％までは許容範囲と考え
られる。これは、プラス２０％を越えると入光端面１３
ａの反対側が暗くなるからであり、マイナス２０％を下
回ると反射光量が少なくなって導光板１３全体が暗くな
るからである。また、反射面１３ｂの高さＲＨは、入光
端面１３ａの高さＨの１／５０〜１／１５０となってい
るのがよい。これは、本発明者による検討の結果、高さ
ＲＨが高さＨの１／５０以上の場合には、入射光が導光
板１３の入光端面１３ａと反対面まで到達しにくくなっ
て導光板１３の入光端面１３ａの反対側が暗くなるから
である。また、高さＲＨが高さＨの１／１５０以下の場
合には、反射光量が少なくなって導光板１３全体が暗く
なるからである。具体的に反射面１３ｂの高さは、目視
による反射面１３ｂの段差が認識しづらい程度というこ
とを考慮して、たとえば１５μｍ以下とすることができ
る。Further, the thickness of the light guide plate 13 and the reflection surface 13b
(The distance between the first virtual plane b and the third virtual plane a) is set. Here, the height RH of the reflection surface 13b
Is consideration so that (the total number of height H / curved parts 13b1 of the light incident face 13a S × √2). According to the study of the present inventor, the height RH of the reflection surface 13b is considered to be an allowable range up to ± 20% in this equation. This is because the light incident end face 13 exceeds + 20%.
This is because the side opposite to “a” becomes darker, and if it is less than −20%, the amount of reflected light decreases and the entire light guide plate 13 becomes darker. The height RH of the reflecting surface 13b is preferably 1/50 to 1/150 of the height H of the light incident end face 13a. This is because, as a result of the study by the present inventor, when the height RH is 1/50 or more of the height H, the incident light is difficult to reach the surface opposite to the light incident end face 13a of the light guide plate 13 and the light guide plate This is because the opposite side of the light-incident end face 13a of 13 becomes dark. Further, when the height RH is 1/150 or less of the height H, the amount of reflected light is reduced, and the entire light guide plate 13 becomes dark. Specifically, the height of the reflecting surface 13b can be set to, for example, 15 μm or less in consideration of the fact that the level difference of the reflecting surface 13b is difficult to recognize visually.
【００６０】後述する中心角θは４５°を標準とし、材
質により適宜変化させる。このとき、ＬＣＤ１４と出射
面１３ｃとの間にある程度の間隔がある場合には、出射
面１３ｃより出射するときの屈折率も考慮する必要があ
る。なお、反射を目的とするため、中心角θは、前述の
ように、端部角θ１ を考慮することが必要である。The central angle θ described later is 45 ° as a standard, and is appropriately changed depending on the material. At this time, if there is a certain distance between the LCD 14 and the emission surface 13c, it is necessary to consider the refractive index when the light is emitted from the emission surface 13c. Since for the purpose of reflecting, the center angle theta, as described above, it is necessary to consider the end angle theta1.
【００６１】これらの条件下において、湾曲面部１３ｂ
１ の間隔Ｐを考慮して反射光の出射面１３ｃにおける
拡散間隔Ｐ１ を設定する。例えば、ＬＣＤ１４の全面
に対して偏りを抑えて反射光を照射させたい場合、湾曲
面部１３ｂ１ どうしの間隔Ｐと反射光の出射面１３ｃ
における拡散間隔Ｐ１ とがおおよそ等しくなる程度に
設定するようにする。これにより、湾曲面部１３ｂ１
の曲率半径と焦点位置とが決まり、これから曲率中心Ｃ
が決まる。なお、一例を挙げると、湾曲面部１３ｂ１
の曲率半径を、たとえば２５０μｍ以下に設定し、湾曲
面部１３ｂ１ の焦点位置を、導光板１３の厚さの反射
面１３ｂ寄り１／３以下に設定する。Under these conditions, the curved surface portion 13b
Taking into account thefirst interval P to set the diffusion distance P1 at the exit surface 13c of the reflected light. For example, when it is desired to irradiate the entire surface of the LCD 14 with reflected light while suppressing the deviation, the interval P between the curved surface portions 13b1 and the reflected light exit surface 13c
A diffusion distance P1 in is to set to the extent that roughly equal. Thereby, the curved surface portion 13b1
Radius of curvature and focal position are determined, and the center of curvature C
Is determined. In addition, as an example, the curved surface portion 13b1
The radius of curvature of, for example set to 250μm or less, the focal position of the curved surface portion 13b1, set below the reflective surface 13b toward one third of the thickness of the light guide plate 13.
【００６２】以上を踏まえて、図１５に基づいて説明す
る。Based on the above, description will be made with reference to FIG.
【００６３】ここで、反射面１３ｂの複数の谷線を含む
平面を第１の仮想平面ｂとし、反射面１３ｂの複数の稜
線を含む平面を第３の仮想平面ａとし、第１の仮想平面
ｂと第３の仮想平面ａとから等間隔に位置する面を第４
の仮想平面ＲＣとし、湾曲面部１３ｂ１ の高さ方向に
位置する一組の谷線と稜線とを含む平面ｅと第４の仮想
平面ＲＣが交差する位置および湾曲面部１３ｂ１ の曲
率中心Ｃを含む面を第５の仮想平面ｄとし、第１の仮想
平面ｂと交差する湾曲面部１３ｂ１ の位置および湾曲
面部１３ｂ１ の曲率中心Ｃを含む面を第２の仮想平面
ｌとし、第３の仮想平面ａと交差する湾曲面部１３ｂ１
の位置および湾曲面部１３ｂ１ の曲率中心Ｃを含む面
を第６の仮想平面ｇとし、第１の仮想平面ｂと第３の仮
想平面ａとの間隔をＲＨする。Here, a plane including a plurality of valleys of the reflecting surface 13b is defined as a first virtual plane b, a plane including a plurality of ridges of the reflecting surface 13b is defined as a third virtual plane a, and a first virtual plane a is defined. b and a plane located at an equal interval from the third virtual plane a
Of a virtual plane RC, the center of curvature C of the position and curved part 13b1 plane e and the fourth imaginary plane RC comprising a pair of valley lines and ridge lines located in the height direction of the curved part 13b1 intersects includes a surface and a fifth imaginary plane d, the plane containing the center of curvature C of the position and curved parts 13b1 of the curved surface portion 13b1 which intersects the first virtual plane b and the second virtual plane l, third Curved surface portion 13b1 that intersects virtual plane a
The position and the plane including the center of curvature C of the curved surface portion 13b1 of the virtual plane g of sixth and RH a distance between the first virtual plane b and the third imaginary plane a.
【００６４】前述のように中心角θ、つまり第５の仮想
平面ｄが決まると、この第５の仮想平面ｄと第４の仮想
平面ＲＣの交点が決まる。When the center angle θ, that is, the fifth virtual plane d is determined as described above, the intersection of the fifth virtual plane d and the fourth virtual plane RC is determined.
【００６５】線状光源体１２から入射端面１３ａに入射
する光の大部分が所定の入射角±λになるようにしたと
きにおいて、例えば、前述のように、湾曲面部１３ｂ１
の間隔Ｐと反射光の出射面１３ｃにおける拡散間隔Ｐ
１ とおおよそ等しく設定するという条件から、曲率中
心Ｃが決まることになる。具体的には、第１の仮想平面
ｂと第２の仮想平面ｌとの交点と拡散間隔Ｐ１ におけ
る光源１１側の端部ｔ２ を含む平面ｈと、第１の仮想
平面ｂと第２の仮想平面ｌとの交点から平面部１３ｂ２
に向かってλ’の角度をなす平面ｉとがなす角が臨界
角２αとなる。ここで、角度λ’は、湾曲面部１３ｂ１
へ入射する光の角度（出射面１３ｃを基準）であり、
光の入射角λの光が平面部１３ｂ２ により全反射した
ものである。また、第３の仮想平面ａと第６の仮想平面
ｇとの交点と拡散間隔Ｐ１ における光源１１と反対側
の端部ｔ１ を含む平面ｊと、第３の仮想平面ａと第６
の仮想平面ｇとの交点から出射面１３ｃに向かってλの
角度をなす平面ｋとがなす角が臨界角２αとなる。Light is incident on the incident end face 13a from the linear light source 12
And the majority of the light that
At this time, for example, as described above, the curved surface portion 13b1
P and the diffusion distance P of the reflected light at the exit surface 13c
1 From the condition that it is set approximately equal to
The heart C will be decided. Specifically, the first virtual plane
the intersection point between b and the second virtual plane l and the diffusion distance P1 Smell
End t on the light source 11 side2 And a first virtual
From the intersection of the plane b and the second virtual plane 12
The angle formed by the plane i that forms an angle of λ 'toward
The angle becomes 2α. Here, the angle? '1
Is the angle of the light that enters (with reference to the exit surface 13c),
The light having an incident angle λ of the light is2 Totally reflected by
Things. Also, a third virtual plane a and a sixth virtual plane
Intersection with g and diffusion interval P1 Side opposite to light source 11 at
End t1 J, the third virtual plane a and the sixth
From the intersection with the virtual plane g of
The angle formed by the angle plane k is the critical angle 2α.
【００６６】曲率中心Ｃは、第２の仮想平面ｌと第６の
仮想平面ｇとが交差する線に位置することになる。な
お、曲率中心Ｃの位置が決定されれば、当然に湾曲面部
１３ｂ１ の曲率半径も決定されることになる。The center of curvature C is defined by the second virtual plane l and the sixth virtual plane l.
It will be located on the line where the virtual plane g intersects. What
If the position of the center of curvature C is determined, the curved surface
13b1 Is also determined.
【００６７】なお、曲率中心Ｃと第１の仮想平面ｂとの
交点および第３の仮想平面ａとの交点が求められ、湾曲
面部１３ｂ１ が決まる。[0067] Incidentally, the intersection between the intersection and the third imaginary plane a of the center of curvature C and the first virtual plane b are determined, the curved surface portion 13b1 is determined.
【００６８】このようにして個々の湾曲面部１３ｂ１
が決まったならば、端部に位置する湾曲面部１３ｂ１
と第３の仮想平面ａとの交点と、その隣に位置する湾曲
面部１３ｂ１ と第１の仮想平面ｂとの交点とを結んで
平面部１３ｂ２ が決まる。そして、これを順次繰り返
すと、湾曲面部１３ｂ１ と平面部１３ｂ２ とからなる
反射面１３ｂが構成される。In this manner, each curved surface portion 13b1
Is determined, the curved surface portion 13b1 located at the end portion
If the intersection of the third imaginary plane a, plane portion 13b2 determined by connecting the intersections of the curved part 13b1 is located next to the first virtual plane b. When sequentially repeating this, the reflecting surface 13b is formed consisting of the curved surface portion 13b1 and the flat portion 13b2 Prefecture.
【００６９】このように、湾曲面部１３ｂ１ の曲率中
心Ｃおよび曲率半径は、設定したい拡散間隔Ｐ１ およ
び光源１１から導光板１３への入射角を決定すること
で、簡易に算出することができる。[0069] Thus, the center of curvature C and a radius of curvature of the curved surface portion 13b1 is to determine the incidence angle from the diffusion distance P1 and the light source 11 to be set to the light guide plate 13 can be easily calculated .
【００７０】また、導光板１３への入射角を決定し、曲
率中心Ｃおよび曲率半径を変化させて、拡散間隔Ｐ１
を所望の大きさに設定するようにしてもよい。The angle of incidence on the light guide plate 13 is determined, the center of curvature C and the radius of curvature are changed, and the diffusion interval P1 is determined.
May be set to a desired size.
【００７１】したがって、本実施の形態の導光板１３に
よれば、導光板１３の厚さ方向に湾曲して形成された湾
曲面部１３ｂ１ の反射凹面で入射光を反射しているの
で、反射光が拡散されてＬＣＤ１４への照射幅が広くな
り、ＬＣＤ１４が局所的に強く照射されることがなくな
る。これにより、照射部分への強い照射による視覚的な
強い明暗を抑制することができ、ＬＣＤ１４が見やすく
なる。[0071] Therefore, according to the light guide plate 13 of the present embodiment, since the reflected incident light by the reflection concave curved surface portion 13b1 which is curved in the thickness direction of the light guide plate 13, the reflected light Is diffused, and the irradiation width to the LCD 14 is widened, so that the LCD 14 is not locally irradiated strongly. Thereby, it is possible to suppress the strong light and darkness caused by the strong irradiation to the irradiation part, and the LCD 14 becomes easy to see.
【００７２】さて、以上に説明した導光板１３は、たと
えば次のようにして製造することができる。The light guide plate 13 described above can be manufactured, for example, as follows.
【００７３】すなわち、図１６に示すように、先ず、反
射面１３ｂの反転形状が形成された形状転写部材１６を
用意する。なお、形状転写部材１６の材料は、金属のみ
ならず種々の非金属（たとえば、アクリル、セラミック
など）を用いることができる。That is, as shown in FIG. 16, first, a shape transfer member 16 having an inverted shape of the reflection surface 13b is prepared. In addition, as a material of the shape transfer member 16, not only a metal but also various nonmetals (for example, acrylic, ceramic, or the like) can be used.
【００７４】次に、この形状転写部材１６の上に、透明
性を有する液体状の紫外線硬化性を有する樹脂１７を塗
布し（図１７）、さらに、樹脂１７の上に透明性を有す
る平坦なガラス板１８を載置する（図１８）。Next, on the shape transfer member 16, a liquid liquid ultraviolet-curing resin 17 having a transparency is applied (FIG. 17), and a transparent flat resin is applied on the resin 17. The glass plate 18 is placed (FIG. 18).
【００７５】そして、図１９に示すように、ガラス板１
８側から紫外線を照射して樹脂１７を硬化させる。Then, as shown in FIG.
The resin 17 is cured by irradiating ultraviolet rays from the 8 side.
【００７６】硬化後、形状転写部材１６を離脱すると
（図２０）、ガラス板１８からなり出射面１３ｃを備え
た基板層と、この基板層１８と一体的に形成された樹脂
１７からなり反射面１３ｂを備えた樹脂層とで構成され
た導光板１３が得られる。After the curing, the shape transfer member 16 is detached (FIG. 20). When the shape transfer member 16 is detached (FIG. 20), a reflection layer made of a resin layer 17 integrally formed with the substrate layer made of a glass plate 18 and having an emission surface 13c is formed. The light guide plate 13 composed of the resin layer provided with the resin layer 13b is obtained.
【００７７】一例として、本実施の形態においては、基
板層１８の厚さは０．５〜１．０ｍｍ、樹脂層１７の厚
さは２０〜５０μｍとされている。As an example, in the present embodiment, the thickness of the substrate layer 18 is 0.5 to 1.0 mm, and the thickness of the resin layer 17 is 20 to 50 μm.
【００７８】なお、ガラス板１８上に樹脂１７を塗布
し、この上に形状転写部材１６を載置してもよい。Note that the resin 17 may be applied on the glass plate 18 and the shape transfer member 16 may be placed thereon.
【００７９】また、ここでは紫外線硬化性を有する樹脂
１７が用いられているが、紫外線以外の波長で硬化する
光硬化性樹脂を使用してもよい。さらに、状態が液体か
ら固体へ変化する樹脂であれば、光硬化性樹脂以外の樹
脂を使用することができる。Although the resin 17 having ultraviolet curability is used here, a photocurable resin that cures at a wavelength other than ultraviolet light may be used. Further, a resin other than the photocurable resin can be used as long as the resin changes its state from liquid to solid.
【００８０】このようにして導光板１３を製造すれば、
樹脂１７が液状のときに形状転写部材１６の微細形状が
反射面１３ｂを形成する樹脂１７側に転写されるので、
高い寸法精度の導光板１３を容易に製造することが可能
になる。When the light guide plate 13 is manufactured as described above,
Since the fine shape of the shape transfer member 16 is transferred to the resin 17 forming the reflection surface 13b when the resin 17 is in a liquid state,
The light guide plate 13 with high dimensional accuracy can be easily manufactured.
【００８１】また、ガラス板１８は樹脂１７と比較して
光の透過性がよいために、図２１に示すように導光板１
３全体としての光の減衰が少なくなる。したがって、Ｌ
ＣＤ１４をより明るく照射することが可能になり、同じ
明るさならば、より低光度の光源１１を用いることがで
きて導光板１３の取り付けられたディスプレイ装置１０
の省電力化を図ることが可能になる。Further, since the glass plate 18 has better light transmittance than the resin 17, the light guide plate 1 as shown in FIG.
3 The light attenuation as a whole is reduced. Therefore, L
It becomes possible to illuminate the CD 14 more brightly, and if the brightness is the same, the light source 11 of lower luminous intensity can be used, and the display device 10 with the light guide plate 13 attached thereto.
Power saving can be achieved.
【００８２】さらに、射出成形のように高温、高圧下で
キャビティ内に樹脂１７を射出するのではなく、樹脂１
７と形状転写部材１６とを接合して形状転写を行ってい
るので、形状転写部材１６の摩耗速度が遅くなり、反射
面１３ｂの寸法精度を安定的に維持することが可能にな
る。Further, instead of injecting the resin 17 into the cavity under high temperature and high pressure as in the injection molding, the resin 1
Since the shape transfer is performed by joining the shape transfer member 16 with the shape transfer member 16, the wear rate of the shape transfer member 16 is reduced, and the dimensional accuracy of the reflection surface 13b can be stably maintained.
【００８３】さらに、このように樹脂１７と形状転写部
材１６とを接合して形状転写を行っているので、形状転
写部材１６は、射出成形の金型のように高温、高圧下で
使用されない。したがって、前述のように、金属のみな
らずセラミックなどの非金属でも形状転写部材１６を形
成することができ、形状転写部材１６の形状加工を容易
に行うことができる。Further, since the shape transfer is performed by bonding the resin 17 and the shape transfer member 16 in this manner, the shape transfer member 16 is not used under a high temperature and a high pressure unlike an injection molding die. Therefore, as described above, the shape transfer member 16 can be formed not only of a metal but also of a nonmetal such as a ceramic, and the shape processing of the shape transfer member 16 can be easily performed.
【００８４】そして、仮に製造過程で微細な透明状の異
物が樹脂１７内に混入しても、その異物は液状の樹脂１
７に同化してしまうので、導光板１３内の異物により視
認性が悪化することがない。Even if fine transparent foreign matter enters the resin 17 during the manufacturing process, the foreign matter is
7, the visibility is not deteriorated by the foreign matter in the light guide plate 13.
【００８５】なお、このような製造方法は、以上説明し
たような反射面１３ｂが湾曲面部１３ｂ１ と平面部１
３ｂ２ とから構成された導光板１３のみならず、プリ
ズムアレイが断面鋸歯状に形成された導光板（図２２お
よび図２３参照）にも適用することができる。[0085] Such a manufacturing method is more reflective surfaces 13b as described curved surface portion 13b1 and the flat portion 1
The present invention can be applied not only to the light guide plate 13 composed of 3b2 but also to a light guide plate (see FIGS. 22 and 23) in which the prism array has a saw-tooth cross section.
【００８６】[0086]
【発明の効果】以上説明したように、本発明の導光板に
関する技術によれば、導光板の厚さ方向に湾曲して形成
された湾曲面部の反射凹面で入射光を反射しているの
で、反射光が拡散され、視覚的な強い明暗を抑制して表
示部を表示することが可能になるという有効な効果が得
られる。As described above, according to the technology relating to the light guide plate of the present invention, the incident light is reflected by the reflection concave surface of the curved surface formed by bending the light guide plate in the thickness direction. The reflected light is diffused, and an effective effect is obtained in that the display section can be displayed while suppressing strong light and dark.
【００８７】本発明の導光板の製造方法によれば、樹脂
が液状のときに形状転写部材の微細形状が反射面を形成
する樹脂側に転写されるので、高い寸法精度の導光板を
容易に製造することが可能になるという有効な効果が得
られる。According to the method for manufacturing a light guide plate of the present invention, when the resin is in a liquid state, the fine shape of the shape transfer member is transferred to the resin side forming the reflection surface, so that the light guide plate with high dimensional accuracy can be easily manufactured. An effective effect of being able to manufacture is obtained.
【００８８】また、ガラス板は樹脂と比較して光の透過
性がよいので、光の減衰の少ない導光板を得ることが可
能になるという有効な効果が得られる。Further, since the glass plate has better light transmittance than the resin, an effective effect that a light guide plate with less light attenuation can be obtained can be obtained.
【００８９】さらに、樹脂と形状転写部材とを接合して
形状転写を行っているので、形状転写部材の摩耗速度が
遅くなり、反射面の寸法精度を安定的に維持することが
可能になるという有効な効果が得られる。Further, since the shape transfer is performed by joining the resin and the shape transfer member, the wear rate of the shape transfer member is reduced, and the dimensional accuracy of the reflection surface can be stably maintained. Effective effects can be obtained.
【００９０】そして、樹脂内に混入した透明状の異物は
液状の樹脂に同化してしまうので、導光板での混入異物
による視認性悪化を防止することが可能になるという有
効な効果が得られる。Since the transparent foreign matter mixed into the resin is assimilated into the liquid resin, it is possible to obtain an effective effect that it is possible to prevent the visibility from being deteriorated due to the foreign matter mixed in the light guide plate. .
【図１】本発明の一実施の形態である導光板が用いられ
たディスプレイ装置を示す分解斜視図FIG. 1 is an exploded perspective view showing a display device using a light guide plate according to an embodiment of the present invention.
【図２】図１のディスプレイ装置のII−II線に沿った断
面図FIG. 2 is a cross-sectional view of the display device of FIG. 1 taken along the line II-II.
【図３】本発明の一実施の形態である導光板の要部を示
す第１の説明図FIG. 3 is a first explanatory view showing a main part of a light guide plate according to an embodiment of the present invention;
【図４】湾曲面部を所定の曲率半径に設定した場合にお
ける本実施の形態の導光板の要部を示す説明図FIG. 4 is an explanatory view showing a main part of the light guide plate of the present embodiment when a curved surface portion is set to a predetermined radius of curvature.
【図５】湾曲面部の曲率半径を図４に示す例より大きく
した場合における本実施の形態の導光板の要部を示す説
明図FIG. 5 is an explanatory view showing a main part of the light guide plate of the present embodiment when the radius of curvature of the curved surface portion is larger than that in the example shown in FIG.
【図６】湾曲面部の曲率半径を図５に示す例より大きく
した場合における本実施の形態の導光板の要部を示す説
明図FIG. 6 is an explanatory diagram showing a main part of the light guide plate of the present embodiment when the radius of curvature of the curved surface portion is larger than that in the example shown in FIG.
【図７】図４〜図６の導光板に対する入射光の一例を示
す説明図FIG. 7 is an explanatory view showing an example of light incident on the light guide plate of FIGS. 4 to 6;
【図８】図４の導光板に図７の入射光を取り込んだ場合
における反射光の光路を示す説明図8 is an explanatory diagram showing an optical path of reflected light when the incident light of FIG. 7 is taken into the light guide plate of FIG. 4;
【図９】図８の導光板において複数の湾曲面部における
反射光の光路を示す説明図FIG. 9 is an explanatory diagram showing optical paths of reflected light on a plurality of curved surfaces in the light guide plate of FIG. 8;
【図１０】図５の導光板に図７の入射光を取り込んだ場
合における反射光の光路を示す説明図10 is an explanatory diagram showing an optical path of reflected light when the incident light of FIG. 7 is taken into the light guide plate of FIG. 5;
【図１１】図１０の導光板において複数の湾曲面部にお
ける反射光の光路を示す説明図FIG. 11 is an explanatory diagram showing optical paths of reflected light on a plurality of curved surfaces in the light guide plate of FIG. 10;
【図１２】図６の導光板に図７の入射光を取り込んだ場
合における反射光の光路を示す説明図FIG. 12 is an explanatory diagram showing an optical path of reflected light when the incident light of FIG. 7 is taken into the light guide plate of FIG. 6;
【図１３】図１２の導光板において複数の湾曲面部にお
ける反射光の光路を示す説明図FIG. 13 is an explanatory diagram showing optical paths of reflected light on a plurality of curved surfaces in the light guide plate of FIG. 12;
【図１４】本発明の一実施の形態である導光板の要部を
示す第２の説明図FIG. 14 is a second explanatory view showing a main part of a light guide plate according to an embodiment of the present invention;
【図１５】本発明の一実施の形態である導光板の要部を
示す第３の説明図FIG. 15 is a third explanatory view showing a main part of a light guide plate according to an embodiment of the present invention;
【図１６】本発明の一実施の形態である導光板の製造方
法の一部を示す説明図FIG. 16 is an explanatory view showing a part of a method for manufacturing a light guide plate according to an embodiment of the present invention.
【図１７】本発明の一実施の形態である導光板の製造方
法の図１６に続く説明図FIG. 17 is an explanatory view following FIG. 16 of the method for manufacturing the light guide plate according to one embodiment of the present invention;
【図１８】本発明の一実施の形態である導光板の製造方
法の図１７に続く説明図FIG. 18 is an explanatory view following FIG. 17 of the method for manufacturing the light guide plate according to one embodiment of the present invention;
【図１９】本発明の一実施の形態である導光板の製造方
法の図１８に続く説明図FIG. 19 is an explanatory view following FIG. 18 of the method for manufacturing the light guide plate according to one embodiment of the present invention;
【図２０】本発明の一実施の形態である導光板の製造方
法の図１９に続く説明図FIG. 20 is an explanatory view following FIG. 19 of the method for manufacturing the light guide plate according to one embodiment of the present invention;
【図２１】本発明の一実施の形態である導光板における
光の減衰状態を示す説明図FIG. 21 is an explanatory diagram showing a light attenuation state in a light guide plate according to an embodiment of the present invention.
【図２２】従来の導光板における光の反射を示す説明図FIG. 22 is an explanatory diagram showing light reflection on a conventional light guide plate.
【図２３】従来の導光板における光の減衰状態を示す説
明図FIG. 23 is an explanatory view showing a light attenuation state in a conventional light guide plate.
１０ ディスプレイ装置 １１ 光源 １２ 線状導光体 １３ 導光板 １３ａ 入光端面 １３ｂ 反射面 １３ｂ１ 湾曲面部 １３ｂ２ 平面部 １３ｃ 出射面 １４ ＬＣＤ（表示部） １５ 反射板 １６ 形状転写部材 １７ 樹脂（樹脂層） １８ ガラス板（基板層） Ｃ 曲率中心 ＲＣ 第４の仮想平面 ａ 第３の仮想平面 ｂ 第１の仮想平面 ｄ 第５の仮想平面 ｇ 第６の仮想平面 ｌ 第２の仮想平面 ｆ 焦点 θ 中心角 θ１ 端部角DESCRIPTION OF SYMBOLS 10 Display apparatus 11 Light source 12 Linear light guide 13 Light guide plate 13a Light incident end surface 13b Reflection surface 13b1 Curved surface part 13bTwo plane part 13c Emission surface 14 LCD (display part) 15 Reflection plate 16 Shape transfer member 17 Resin (resin layer) ) 18 glass plate (substrate layer) C center of curvature RC fourth virtual plane a third virtual plane b first virtual plane d fifth virtual plane g sixth virtual plane l second virtual plane f focal point θ Center angle θ1 end angle
───────────────────────────────────────────────────── フロントページの続き (72)発明者 冨崎 博隆 大阪府門真市大字門真1006番地 松下電器 産業株式会社内 Ｆターム(参考） 2H038 AA55 BA06 2H091 FA16Z FA23Z FA41Z FB02 FB04 LA17 LA18 5G435 AA01 BB12 BB16 EE22 FF08 GG23 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hirotaka Tomisaki 1006 Kazuma Kadoma, Kadoma-shi, Osaka Matsushita Electric Industrial Co., Ltd.F-term (reference) FF08 GG23
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000373488AJP2002174732A (en) | 2000-12-07 | 2000-12-07 | Light guide plate, display device and electronic device using the same, and method of manufacturing light guide plate |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000373488AJP2002174732A (en) | 2000-12-07 | 2000-12-07 | Light guide plate, display device and electronic device using the same, and method of manufacturing light guide plate |
| Publication Number | Publication Date |
|---|---|
| JP2002174732Atrue JP2002174732A (en) | 2002-06-21 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000373488APendingJP2002174732A (en) | 2000-12-07 | 2000-12-07 | Light guide plate, display device and electronic device using the same, and method of manufacturing light guide plate |
| Country | Link |
|---|---|
| JP (1) | JP2002174732A (en) |
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