JP3325710B2 - Method for manufacturing light guide plate and mold for molding the same, and surface light source device - Google Patents
Method for manufacturing light guide plate and mold for molding the same, and surface light source deviceInfo
- Publication number
- JP3325710B2 JP3325710B2 JP17556594A JP17556594A JP3325710B2 JP 3325710 B2 JP3325710 B2 JP 3325710B2 JP 17556594 A JP17556594 A JP 17556594A JP 17556594 A JP17556594 A JP 17556594A JP 3325710 B2 JP3325710 B2 JP 3325710B2
- Authority
- JP
- Japan
- Prior art keywords
- guide plate
- light
- light guide
- light source
- annular concave
- 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
Links
Description
【０００１】[0001]
【産業上の利用分野】本発明は面光源装置、特に液晶テ
レビ，ワードプロセッサ，パーソナルコンピュータ等の
携持型電子機器における液晶表示装置のような非発光表
示装置に実装され、そのバックライト用の光源として用
いられる導光板およびこれを製作するための成形金型の
製造方法ならびにこの導光板が組み込まれた面光源装置
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applied to a surface light source device, particularly a non-light emitting display device such as a liquid crystal display device in a portable electronic device such as a liquid crystal television, a word processor, a personal computer, etc., and a light source for its backlight. The present invention relates to a light guide plate used as a light guide, a method of manufacturing a molding die for manufacturing the same, and a surface light source device incorporating the light guide plate.
【０００２】[0002]
【従来の技術】従来、かかる面光源装置としては種々の
ものが提案されているが、このうち例えば特開平１−２
４５２２０号（従来例１）には、バックライト方式によ
り光を照射する液晶表示装置で液晶パネルの背面部に位
置する透光性板の少なくとも一側面端部を光入射部と
し、かつ、該透光性板の、液晶パネルとの接近面と反対
側の面に、前記光入射部から離れるに従って光散乱物質
を塗布あるいは付着等の手段で密に施し、さらにその表
面を鏡面反射板で覆った液晶表示装置が開示されてい
る。2. Description of the Related Art Conventionally, various types of surface light source devices have been proposed.
No. 45220 (conventional example 1) discloses a liquid crystal display device that irradiates light by a backlight method, in which at least one side edge of a light-transmitting plate located on the back of a liquid crystal panel is used as a light incident portion, and On the surface of the optical plate, opposite to the surface close to the liquid crystal panel, a light scattering substance was applied densely by means such as coating or adhesion as the distance from the light incident portion increased, and the surface was further covered with a mirror reflector. A liquid crystal display device is disclosed.
【０００３】[0003]
【発明が解決しようとする課題】ところで、一般にこの
ような面光源装置には、光源からの距離にかかわりなく
面全体に亘り均一な明るさを有していることが要求され
る他、光源の光強度を減じないようにすることが要求さ
れる。また、機器の小型化，低価格化に対応して製作が
容易で実装性に優れていることが要求されている。In general, such a surface light source device is required to have uniform brightness over the entire surface irrespective of the distance from the light source. It is required not to reduce the light intensity. In addition, it is required to be easy to manufacture and to have excellent mountability in response to miniaturization and cost reduction of equipment.
【０００４】しかしながら、上述の従来装置にあって
は、明るさの均一性という面では一応の評価が得られる
ものの、光源の光強度の維持という観点においてまだ満
足できないものであった。というのも、光散乱物質が透
光性板の表面に塗布されているので、透光性板における
光源からの直進光を有効に活用できないからである。[0004] However, in the above-mentioned conventional device, although a certain evaluation can be obtained in terms of brightness uniformity, it has not been satisfactory from the viewpoint of maintaining the light intensity of the light source. This is because the light-scattering substance is applied to the surface of the light-transmitting plate, so that the straight light from the light source on the light-transmitting plate cannot be effectively used.
【０００５】そこで、このような直進光を有効に活用す
べく実開平２−１２６１８５号（従来例２）では、導光
体の片面を斜面とした断面楔形に形成し、この斜面を入
射端面と平行に延びる無数のヘアライン状粗面としてい
る。Therefore, in order to effectively utilize such straight traveling light, Japanese Utility Model Laid-Open No. 2-126185 (Conventional Example 2) forms a wedge-shaped cross section with one surface of a light guide as an inclined surface. It has an innumerable hairline-like rough surface extending in parallel.
【０００６】しかしながら、このものは無数のヘアライ
ンを施す必要があることから製作性や実装性が悪く、ま
た明るさの均一性という点において問題があった。[0006] However, this method has problems in that it is necessary to apply an infinite number of hairlines, so that its manufacturability and mountability are poor, and that the brightness is uniform.
【０００７】本発明の目的は、かかる従来の問題を解消
し、光源の明るさを減ずることなく均一な面輝度が得ら
れ、かつ実装性に優れた導光板およびこれを製作するた
めの成形金型の製造方法ならびにこの導光板が組み込ま
れた面光源装置を提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to solve such a conventional problem, to obtain a light guide plate having a uniform surface luminance without reducing the brightness of a light source and to be excellent in mountability, and a mold for manufacturing the same. It is an object of the present invention to provide a method of manufacturing a mold and a surface light source device incorporating the light guide plate.
【０００８】[0008]
【課題を解決するための手段】本発明の第一の形態は、
表裏面および光を入射させる入射端面を有する導光板で
あって、前記表裏面のうちの少なくとも一面には所定配
列された環状の凹部が形成されていることを特徴とする
ものである。Means for Solving the Problems A first aspect of the present invention is as follows.
A light guide plate having a front and back surface and an incident end surface on which light is incident, wherein at least one of the front and back surfaces is formed with a predetermined array of annular concave portions.
【０００９】本発明の第一の形態による導光板におい
て、環状の凹部は入射端面から遠ざかるに従って深さが
増大しているものであってよい。あるいは、入射端面か
ら遠ざかるに従って入射端面からの光の入力方向と直交
する方向の外側投影面積が増大しているものであってよ
い。環状の凹部を表裏面にそれぞれ形成した場合、表面
側に形成される環状の凹部を裏面側に形成される環状の
凹部に比べて小さく設定することが好ましい。[0009] In the light guide plate according to the first aspect of the present invention, the annular concave portion may have a depth that increases as the distance from the incident end surface increases. Alternatively, the outer projection area in the direction orthogonal to the light input direction from the incident end face may increase as the distance from the incident end face increases. When the annular concave portions are formed on the front and back surfaces, respectively, it is preferable that the annular concave portion formed on the front surface side is set smaller than the annular concave portion formed on the rear surface side.
【００１０】本発明の第二の形態は、本発明の第一の形
態による導光板製作するための成形金型の製造方法であ
って、導光板の表裏面の環状の凹部が形成される面を成
形するための成形金型の表面にフォトレジストを塗布す
るステップと、このフォトレジストに前記環状の凹部の
配列パターンに対応したパターンを露光するステップ
と、前記環状の凹部に対応して環状にフォトレジストが
残るように、他のフォトレジストの部分およびこれと対
応する成形金型の表面を所定の深さにエッチングするス
テップと、エッチング後に残留している環状のフォトレ
ジストを除去するステップとを備えたことを特徴とする
ものである。A second aspect of the present invention is a method of manufacturing a molding die for manufacturing a light guide plate according to the first aspect of the present invention, wherein a surface of the light guide plate on which front and rear annular concave portions are formed is formed. Applying a photoresist to the surface of a molding die for molding a pattern, exposing a pattern corresponding to the array pattern of the annular concave portions to the photoresist, and forming an annular shape corresponding to the annular concave portion. Etching a portion of the other photoresist and the surface of the molding die corresponding thereto to a predetermined depth so that the photoresist remains; and removing the annular photoresist remaining after the etching. It is characterized by having.
【００１１】本発明の第二の形態による導光板製作用成
形金型の製造方法において、成形金型の表面から突出す
る環状の凸部に対し、導光板の入射端面となる側ほどそ
の高さが減少するように削除加工するステップをさらに
備えることができる。削除加工は、フライス加工または
放電加工によって行うことができる。[0011] In the method for manufacturing a molding die for producing a light guide plate according to the second aspect of the present invention, the height of the annular convex portion protruding from the surface of the molding die increases toward the incident end face of the light guide plate. The method may further include a step of performing deletion processing so as to reduce the number. The deletion processing can be performed by milling processing or electric discharge processing.
【００１２】本発明の第三の形態による面光源装置は、
本発明の第一の形態による導光板と、この導光板の裏面
側に配置された光反射部材と、前記導光板の前記入射端
面に対向して配設された光源とを備えたことを特徴とす
るものである。A surface light source device according to a third embodiment of the present invention comprises:
The light guide plate according to the first aspect of the present invention, a light reflecting member disposed on the back side of the light guide plate, and a light source disposed opposite to the incident end face of the light guide plate. It is assumed that.
【００１３】本発明の第三の形態による面光源装置にお
いて、導光板の表面側に配置された光拡散部材をさらに
備えることができる。光反射部材を導光板の入射端面以
外の側端面に配設することも可能である。[0013] In the surface light source device according to the third aspect of the present invention, it is possible to further include a light diffusing member disposed on the surface side of the light guide plate. It is also possible to dispose the light reflecting member on a side end surface other than the incident end surface of the light guide plate.
【００１４】[0014]
【作用】本発明において、導光板の入射端面に対向して
配設された光源から導光板内に光が入射されると、表面
側に向かう上向きの光は一部が表面を透過して上方に向
かい、一部は反射して裏面側に向かう。また、裏面側に
向かう下向きの光は一部が反射すると共に一部が裏面を
透過した後、光反射部材で反射され上向きの光となる。
さらに、導光板の表裏面に平行および若干傾斜した直進
光は環状の凹部に当たる度毎に透過および反射し、その
一部が上述の上向きあるいは下向きの光に変換される。
上述のことが繰返されて光源から入射された光は上方に
導かれる。しかして、環状の凹部には光の方向を変換す
る効率のよい側面壁が形成されているので光の反射の頻
度が格段に増大し、光源の光強度が維持された状態で均
一な明るさの面輝度が得られる。In the present invention, when light enters the light guide plate from a light source disposed opposite to the incident end face of the light guide plate, part of the upward light traveling toward the surface side passes through the surface and passes upward. And a part of the light is reflected toward the back side. Further, the downward light heading toward the back surface is partially reflected and partially transmitted through the back surface, and then reflected by the light reflecting member to become upward light.
Further, the straight light that is parallel and slightly inclined to the front and back surfaces of the light guide plate is transmitted and reflected every time it hits the annular concave portion, and a part of the light is converted to the above-described upward or downward light.
By repeating the above, the light incident from the light source is guided upward. However, since the annular concave portion is formed with an efficient side wall for changing the direction of light, the frequency of light reflection is significantly increased, and uniform brightness is maintained in a state where the light intensity of the light source is maintained. Is obtained.
【００１５】また、環状の凹部は光源から遠ざかるに従
い深さが増大する、および／または光源からの入力方向
と直交する方向の投影面積が増大するよう配列されてい
るので、光強度が低下する光源からの遠距離位置におい
て反射頻度がさらに増大し、この結果、なおさら光源の
光強度が維持された状態で均一な明るさの面輝度が得ら
れる。Further, the annular concave portions are arranged so that the depth increases as the distance from the light source increases, and / or the projected area in the direction orthogonal to the input direction from the light source increases, so that the light source whose light intensity decreases. The reflection frequency further increases at a position far from the camera, and as a result, a surface brightness having a uniform brightness can be obtained while maintaining the light intensity of the light source even more.
【００１６】[0016]
【実施例】以下、本発明の実施例を添附図面を参照しつ
つ説明する。Embodiments of the present invention will be described below with reference to the accompanying drawings.
【００１７】図において、１０は液晶表示装置である液
晶パネル、２０は本発明にかかる面光源装置である。面
光源装置２０は液晶パネル１０の背面に配置された光拡
散部材としての光拡散シート２２，該光拡散シートの背
面に配置され平行な表裏面を有する導光板２４，該導光
板２４の裏面側に配設された光反射部材としての光反射
シート２６、および導光板２４の両側の端面（以下、入
射端面と称す）２４Ａ，２４Ａに配設された光源として
の線状光源２８によって概略構成されている。In FIG. 1, reference numeral 10 denotes a liquid crystal panel as a liquid crystal display device, and reference numeral 20 denotes a surface light source device according to the present invention. The surface light source device 20 includes a light diffusion sheet 22 as a light diffusion member disposed on the back surface of the liquid crystal panel 10, a light guide plate 24 disposed on the back surface of the light diffusion sheet and having parallel front and back surfaces, and a back surface side of the light guide plate 24. And a linear light source 28 as a light source disposed on both end surfaces (hereinafter, referred to as incident end surfaces) 24A, 24A of the light guide plate 24. ing.
【００１８】光拡散シート２２は、例えばポリエステル
あるいはポリカーボネイトのフィルムで構成され、液晶
パネル１０の照射光を均一とするために拡散性粒子が混
成されたものや、その表面を粗面加工したものが使用さ
れる。The light diffusion sheet 22 is made of, for example, a polyester or polycarbonate film, and may be made of a material mixed with diffusible particles to make the irradiation light of the liquid crystal panel uniform, or a material whose surface is roughened. used.
【００１９】光反射シート２６は、例えばポリエステル
あるいはポリカーボネイトのフィルムであり、白色の顔
料が混練されており、後述の導光板２４を透過する光を
再度導光板２４側へ反射させている。なお、図示の例で
は、光反射シート２６は導光板２４の裏面２４Ｃのみに
配設されているが、これは光源２８を含み導光板２４の
全端面を覆うように配設すればさらに有効である。この
ためにはシート状に限らず枠部を備えた白色系材料の成
形品を用いてもよい。The light reflecting sheet 26 is, for example, a film of polyester or polycarbonate, is kneaded with a white pigment, and reflects light transmitted through the light guide plate 24 described later toward the light guide plate 24 again. In the illustrated example, the light reflection sheet 26 is provided only on the back surface 24C of the light guide plate 24. However, this is more effective if it is provided so as to cover the entire end surface of the light guide plate 24 including the light source 28. is there. For this purpose, a molded product of a white material having a frame portion is not limited to the sheet shape, and may be used.
【００２０】線状光源２８は蛍光灯等からなり、導光板
２４の入射端面２４Ａ，２４Ａに対向して配置されてい
る。なお、本実施例では導光板２４の両側の端面に配置
されているが、面光源装置の大きさによっては一側端面
に配置することも可能である。The linear light source 28 is composed of a fluorescent lamp or the like, and is disposed so as to face the incident end faces 24A, 24A of the light guide plate 24. In the present embodiment, the light guide plate 24 is arranged on both end faces, but may be arranged on one end face depending on the size of the surface light source device.
【００２１】導光板２４はアクリル樹脂等の透明素材か
ら形成されており、前述のように表裏面が平行な板体で
ある。そして、その表面２４Ｂおよび裏面２４Ｃには多
数の環状凹部３０，３０，…が形成されている。環状凹
部３０は、図４および図５からわかるように、線状光源
２８の位置する入射端面２４Ａから遠ざかるに従い（本
実施例においては図５のＸ方向において導光板２４の中
央に近づくに従い）、その深さが漸次増大するように形
成されており、また、図６からわかるように、入射端面
２４Ａから遠ざかるに従いその方向（Ｘ方向）と直交す
る方向（Ｙ方向）の外側投影面積が漸次増大するように
形成されている。すなわち、図６に示す例は環状凹部３
０が外径Ｄ0 ，内径Ｄi の円筒形状をなしており、奇数
列および奇数行同士のピッチと偶数列および偶数行同士
のピッチとは共にｄであり、奇数列と偶数列および奇数
行と偶数行のピッチがｄ／２の関係、いわゆる千鳥状に
配列され、かつ、各環状凹部３０の外径Ｄ0 および内径
Ｄi が入射端面２４Ａから遠ざかるに従い漸次拡大され
ている。この結果、導光板２４のＹ方向における断面で
みたとき、環状凹部３０の外側投影面積が漸次増大して
いる。The light guide plate 24 is made of a transparent material such as an acrylic resin, and is a plate whose front and back surfaces are parallel as described above. A large number of annular concave portions 30, 30,... Are formed on the front surface 24B and the rear surface 24C. As can be seen from FIGS. 4 and 5, the annular concave portion 30 moves away from the incident end face 24A where the linear light source 28 is located (in the present embodiment, approaches the center of the light guide plate 24 in the X direction of FIG. 5). The depth is formed so as to gradually increase. As can be seen from FIG. 6, the outer projection area in the direction (Y direction) orthogonal to the direction (X direction) gradually increases as the distance from the incident end face 24A increases. It is formed so that. That is, the example shown in FIG.
0 the outer diameter D 0, and a cylindrical shape having an inner diameter D i, and the odd columns and odd rows among the pitch and the even columns and even rows pitch between are both d, odd columns and even columns and odd rows relationship pitch of d / 2 of the even-numbered rows, are arranged in a so-called staggered, and are gradually enlarged in accordance with the outer diameter D 0 and the inner diameter D i of each of the annular recess 30 moves away from the incident end face 24A. As a result, when viewed in a cross section of the light guide plate 24 in the Y direction, the outer projected area of the annular concave portion 30 gradually increases.
【００２２】なお、図６に例示した環状凹部３０の平面
視形状は二重円形であるが、この他に図７（Ａ）ないし
（Ｅ）に示すように、円形，四角形または三角形を種々
に組合わせた形態にしてもよい。さらに、図７（Ｆ）〜
（Ｊ）に示すように、単なる環状凹部形状に限られず、
二重の環状凹部、すなわち、中心の凹部３０−１のまわ
りに環状凹部３０が配置された形態であってもよい。こ
のようにすると、入射光の乱反射の度合が高まり一層効
果が増大する。The annular concave portion 30 illustrated in FIG. 6 has a double circular shape in a plan view. In addition, as shown in FIGS. 7 (A) to 7 (E), various circular, square or triangular shapes can be used. It may be a combined form. Further, FIG.
As shown in (J), the shape is not limited to a simple annular concave shape.
A double annular concave portion, that is, a configuration in which the annular concave portion 30 is arranged around the central concave portion 30-1 may be adopted. By doing so, the degree of irregular reflection of incident light is increased, and the effect is further increased.
【００２３】本明細書で用いる環状とは、後述する凸部
の場合も含めてこのような二重のもの、さらに三重のも
のも包含する意味で用いる。The term "annular" used in the present specification is used to mean such a double or a triple including the case of a convex portion described later.
【００２４】次に、上述した導光板２４の製作方法につ
いて説明する。図示は省略するが、２つの型半分が結合
されその内部に平行平面が向かい合う成形空間が形成さ
れる型式の成形金型を用いる。まず、このそれぞれの型
半分の表面にフォトレジストを塗布したのち、上述の環
状凹部３０の配列パターンを露光し、さらに環状凹部３
０の対応部位が残るよう他の部位をエッチングにより所
定の深さ侵食する。そして、残存したレジストを除去す
る。この状態では、金型の表面に一端面から遠ざかるに
従いその方向と直交する方向の投影面積が増大するよう
配列された所定の高さの環状凸部が形成されている。Next, a method for manufacturing the above-described light guide plate 24 will be described. Although not shown, a molding die of a type in which two mold halves are combined and a molding space in which parallel planes face each other is formed is used. First, after applying a photoresist to the surface of each mold half, the above-described arrangement pattern of the annular concave portions 30 is exposed, and furthermore, the annular concave portions 3 are exposed.
The other portion is etched to a predetermined depth by etching so that the corresponding portion of 0 remains. Then, the remaining resist is removed. In this state, an annular convex portion having a predetermined height is formed on the surface of the mold so that the projected area in a direction orthogonal to the one end surface increases as the distance from the one end surface increases.
【００２５】次に、この環状凸部に対しフライス加工ま
たは放電加工を施し、この環状凸部の高さが上記一端面
に近づくに従い減少するように削除する。その後、両型
半分を結合し、その成形空間にアクリル樹脂等の素材を
射出し、前述の構成の導光板２４を得る。Next, milling or electrical discharge machining is performed on the annular convex portion, and the annular convex portion is deleted so that the height of the annular convex portion decreases as approaching the one end surface. Thereafter, the two mold halves are combined, and a material such as an acrylic resin is injected into the molding space to obtain the light guide plate 24 having the above-described configuration.
【００２６】上述により得られた導光板２４を用いた面
光源装置２０において、線状光源２８に電圧が印加され
ると、光が入射端面２４Ａから入射される。この入射光
のうち導光板２４の表面２４Ｂ側に向かう上向きの光
は、一部が表面２４Ｂを透過して光拡散シート２２に向
かい、一部は反射して裏面２４Ｃ側に向かう。また、裏
面２４Ｃ側に向かう下向きの光は一部が裏面２４Ｃで反
射すると共に一部が裏面２４Ｃを透過した後、光反射シ
ート２６で反射され照明光として利用可能な上向きの光
となる。さらに、図８に示すように、導光板２４の表裏
面に平行および若干傾斜した直進光は環状凹部３０に当
たる度毎に透過および反射しその一部が上述の上向きあ
るいは下向きの光に変換される。環状凹部にすると単に
凹部のみを形成するのに比べ、光の方向を変換する効率
のよい側面壁が増大するので光の反射の頻度が格段に増
大する。このように透過および反射が繰返されて光源２
８から入射された光は光拡散シート２２に導かれるが、
環状凹部３０は光源２８から遠ざかるに従い深さが漸次
増大すると共に投影面積が増大するように配列されてい
るから、光強度が低下する光源２８から遠導光距離位置
において反射頻度が増大する。この結果、光源２８の光
強度が維持された状態で拡散シートにおいて均一な明る
さの面輝度が得られる。In the surface light source device 20 using the light guide plate 24 obtained as described above, when a voltage is applied to the linear light source 28, light is incident from the incident end face 24A. Of the incident light, part of the upward light traveling toward the front surface 24B of the light guide plate 24 passes through the surface 24B and travels toward the light diffusion sheet 22, and part of the incident light travels toward the back surface 24C. The downward light heading toward the back surface 24C is partially reflected by the back surface 24C and partially transmitted through the back surface 24C, and then reflected by the light reflection sheet 26 to be upward light that can be used as illumination light. Further, as shown in FIG. 8, each straight light parallel and slightly inclined to the front and back surfaces of the light guide plate 24 is transmitted and reflected every time it hits the annular concave portion 30, and a part thereof is converted to the above-described upward or downward light. . When an annular concave portion is formed, the number of side walls that efficiently convert the direction of light is increased as compared with the case where only a concave portion is formed, so that the frequency of light reflection is significantly increased. The transmission and reflection are repeated in this manner, and the light source 2
The light incident from 8 is guided to the light diffusion sheet 22,
Since the annular concave portion 30 is arranged so that the depth gradually increases as the distance from the light source 28 increases and the projected area increases, the frequency of reflection increases at a far light guiding distance position from the light source 28 where the light intensity decreases. As a result, a uniform surface luminance can be obtained in the diffusion sheet while the light intensity of the light source 28 is maintained.
【００２７】[0027]
【００２８】[0028]
【００２９】[0029]
【００３０】なお、上述の実施例においては導光板２４
の表面側に光拡散シート２２を配置した例につき説明し
たが、これは必須のものではなく、導光板２４の裏面か
らの屈折光のバランスを取る、例えば環状凹部３０の大
きさの変化率を最適に設定することにより均一な面発光
が得られるときには用いなくともよい。この場合には、
特に導光板２４の表面２４Ｂ側に配設された環状凹部３
０と裏面２４Ｃ側に配設された環状凹部３０との大き
さ、すなわち、その深さまたは高さと投影面積とを異な
らせ、表面側のものが裏面側のものより小さくなるよう
にすることが有効である。In the above embodiment, the light guide plate 24 is used.
Although the example in which the light diffusion sheet 22 is arranged on the front surface side of the light guide plate 24 is described, this is not essential, and the change rate of the size of the annular concave portion 30 is adjusted by balancing the refracted light from the back surface of the light guide plate 24. It is not necessary to use it when uniform surface light emission is obtained by setting it optimally. In this case,
In particular, the annular concave portion 3 disposed on the surface 24B side of the light guide plate 24
0, and the size of the annular concave portion 30 disposed on the back surface 24C side, that is, the depth or height thereof and the projection area are made different so that the front surface side is smaller than the back surface side. It is valid.
【００３１】また、上述の実施例においては線状光源を
導光板の両端面に配設した例につき説明したが、面光源
装置の大きさによっては一側端面でもよく、その光源も
点光源としてもよい。また、環状凹部の形状については
前述のように種々の変形が可能である。Also, in the above-described embodiment, an example in which the linear light source is disposed on both end surfaces of the light guide plate has been described. However, depending on the size of the surface light source device, one end surface may be used, and the light source may be a point light source. Is also good. Further, the shape of the annular concave portion can be variously modified as described above.
【００３２】なお、上述の環状凹部を設けた実施例では
導光板の表裏面が平行となる形態のものにつき説明した
が、これは必須ではなく、一面が平坦な傾斜面のものあ
るいは所定の曲率をもった傾斜面のものであっても本発
明の意図する範囲内にある。In the above-described embodiment in which the annular concave portion is provided, the light guide plate is described as having a configuration in which the front and back surfaces are parallel to each other. However, this is not essential, and the light guide plate has a flat inclined surface or a predetermined curvature. Even those having an inclined surface having a slope are within the range intended by the present invention.
【００３３】[0033]
【発明の効果】本発明の導光板または面光源装置による
と、光源の明るさを減ずることなく均一な面輝度が得ら
れ、異形状を用いることもないので実装性に優れてい
る。According to the light guide plate or the surface light source device of the present invention, a uniform surface luminance can be obtained without reducing the brightness of the light source, and an irregular shape is not used.
【図１】本発明の一実施例を示す分解斜視図である。FIG. 1 is an exploded perspective view showing one embodiment of the present invention.
【図２】本発明の一実施例を示す平面図である。FIG. 2 is a plan view showing an embodiment of the present invention.
【図３】本発明の一実施例を示す断面図である。FIG. 3 is a sectional view showing one embodiment of the present invention.
【図４】図３のＡ部詳細図である。FIG. 4 is a detailed view of a portion A in FIG. 3;
【図５】図４のＢ部詳細図である。FIG. 5 is a detailed view of a portion B in FIG. 4;
【図６】本発明の一実施例における環状凹部の配列パタ
ーンを示す平面図である。FIG. 6 is a plan view showing an arrangement pattern of annular concave portions in one embodiment of the present invention.
【図７】本発明の実施例における環状凹部の他の種々な
る形状を示す平面図である。FIG. 7 is a plan view showing other various shapes of the annular concave portion in the embodiment of the present invention.
【図８】図５のＣおよびＤ部詳細図である。8 is a detailed view of a portion C and D in FIG. 5;
１０ 液晶パネル ２０ 面光源装置 ２２ 光拡散シート ２４ 導光板 ２４Ａ 入射端面 ２６ 光反射シート ２８ 線状光源 ３０ 環状凹部 DESCRIPTION OF SYMBOLS 10 Liquid crystal panel 20 Surface light source device 22 Light diffusion sheet 24 Light guide plate 24A Incident end face 26 Light reflection sheet 28 Linear light source 30 Ring recess
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) G02B 6/00 331 B29C 33/38 F21V 8/00 601 G02F 1/13357 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. 7 , DB name) G02B 6/00 331 B29C 33/38 F21V 8/00 601 G02F 1/13357
Claims (10)
有する導光板であって、 前記表裏面のうちの少なくとも一面には所定配列された
環状の凹部が形成されていることを特徴とする導光板。 1. A front and back surface and an incident end surface on which light is incident.
A light guide plate having a predetermined arrangement on at least one of the front and back surfaces
A light guide plate, wherein an annular concave portion is formed.
ざかるに従い、深さが増大していることを特徴とする請
求項１に記載の導光板。 2. The annular concave portion is far from the incident end face.
The contract is characterized by the fact that the depth is increasing
The light guide plate according to claim 1.
ざかるに従い、前記入射端面からの光の入力方向と直交
する方向の外側投影面積が増大していることを特徴とす
る請求項１または請求項２に記載の導光板。 3. The annular concave portion is far from the incident end face.
As described, the direction of light input from the incident end face is orthogonal to
Characterized in that the outer projected area in the direction of
The light guide plate according to claim 1 or 2, wherein
形成され、表面側に形成された前記環状の凹部が裏面側
に形成された前記環状の凹部に比べて小さく設定されて
いることを特徴とする請求項１から請求項３の何れかに
記載の導光板。 4. An annular recess is provided on each of the front and back surfaces.
The annular concave portion formed on the front side is formed on the rear side.
It is set smaller than the annular recess formed in
4. The method according to claim 1, wherein
The light guide plate as described.
の成形金型の製造方法であって、 導光板の表裏面の環状の凹部が形成される面を成形する
ための成形金型の表面にフォトレジストを塗布するステ
ップと、 このフォトレジストに前記環状の凹部の配列パターンに
対応したパターンを露光するステップと、 前記環状の凹部に対応して環状にフォトレジストが残る
ように、他のフォトレジストの部分およびこれと対応す
る成形金型の表面を所定の深さにエッチングするステッ
プと、 エッチング後に残留している環状のフォトレジストを除
去するステップと を備えたことを特徴とする導光板製作
用金型の製造方法。 5. A method for manufacturing the light guide plate according to claim 1.
Forming a surface on which annular concave portions on the front and back surfaces of the light guide plate are formed.
For applying photoresist to the surface of the molding die
And the photoresist is arranged in an array pattern of the annular concave portions.
Exposing the corresponding pattern, and the photoresist remains in an annular shape corresponding to the annular concave portion
The other photoresist portions and their corresponding
Step to etch the surface of the molding die to a predetermined depth
And remove any remaining cyclic photoresist after etching.
Manufacturing a light guide plate comprising the steps of:
Manufacturing method of metal mold.
に対し、導光板の入射端面となる側ほどその高さが減少
するように削除加工するステップをさらに備えたことを
特徴とする請求項５に記載の導光板製作用成形金型の製
造方法。 6. An annular projection projecting from the surface of a molding die.
In contrast, the height of the light guide plate decreases as it becomes the incident end face.
That there is a further step of deleting
The production of the light-guiding plate forming mold according to claim 5.
Construction method.
電加工によって行われることを特徴とする請求項６に記
載の導光板製作用金型の製造方法。7. The method according to claim 6, wherein the deletion processing is performed by milling or electric discharge machining.
The method for manufacturing the light guide plate production mold described above.
導光板と、この 導光板の裏面側に配置された光反射部材と、前記 導光板の前記入射端面に対向して配設された光源と
を備えたことを特徴とする面光源装置。And <br/> light guide plate according to any one of claims 8 claims 1 to 4, a light reflecting member disposed on the back side of the light guide plate, facing the incident end face of the light guide plate to provided light sources and surface light source device comprising a Bei example kite a.
部材をさらに備えたことを特徴とする請求項８に記載の
面光源装置。9. The surface light source device according to claim 8, further comprising a light diffusing member disposed on a surface side of the front Kishirube light plate.
入射端面以外の側端面にも配設されていることを特徴と
する請求項８または請求項９に記載の面光源装置。Wherein said light reflecting member, said light guide plate
The surface light source device according to claim 8 , wherein the surface light source device is provided on a side end surface other than the incident end surface .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17556594A JP3325710B2 (en) | 1994-07-27 | 1994-07-27 | Method for manufacturing light guide plate and mold for molding the same, and surface light source device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17556594A JP3325710B2 (en) | 1994-07-27 | 1994-07-27 | Method for manufacturing light guide plate and mold for molding the same, and surface light source device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0843635A JPH0843635A (en) | 1996-02-16 |
| JP3325710B2 true JP3325710B2 (en) | 2002-09-17 |
Family
ID=15998310
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17556594A Expired - Lifetime JP3325710B2 (en) | 1994-07-27 | 1994-07-27 | Method for manufacturing light guide plate and mold for molding the same, and surface light source device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3325710B2 (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6712481B2 (en) * | 1995-06-27 | 2004-03-30 | Solid State Opto Limited | Light emitting panel assemblies |
| US6334689B1 (en) | 1997-01-30 | 2002-01-01 | Hitachi, Ltd. | Liquid crystal display |
| JP3257457B2 (en) | 1997-07-31 | 2002-02-18 | 株式会社日立製作所 | Liquid crystal display |
| US6752505B2 (en) | 1999-02-23 | 2004-06-22 | Solid State Opto Limited | Light redirecting films and film systems |
| KR100789142B1 (en) * | 2002-01-18 | 2007-12-28 | 삼성전자주식회사 | Light guided panel and thin type lcd using the same and sheet-less lcd using thereof |
| CN101441292A (en) * | 2003-02-28 | 2009-05-27 | 夏普株式会社 | Surface radiating conversion element, an LCD and a method for fabricating the surface radiating conversion element |
| TWI251104B (en) | 2004-06-07 | 2006-03-11 | Nano Prec Corp | Back lighting apparatus |
| JP5394631B2 (en) * | 2007-10-24 | 2014-01-22 | 株式会社ジャパンディスプレイ | Liquid crystal display |
| CN104033770B (en) * | 2014-06-23 | 2016-12-28 | 青岛申达众创技术服务有限公司 | Even strong light-strip |
-
1994
- 1994-07-27 JP JP17556594A patent/JP3325710B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0843635A (en) | 1996-02-16 |
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