JPH0843635A - Surface light source device - Google Patents
Surface light source deviceInfo
- Publication number
- JPH0843635A JPH0843635A JP6175565A JP17556594A JPH0843635A JP H0843635 A JPH0843635 A JP H0843635A JP 6175565 A JP6175565 A JP 6175565A JP 17556594 A JP17556594 A JP 17556594A JP H0843635 A JPH0843635 A JP H0843635A
- Authority
- JP
- Japan
- Prior art keywords
- light
- light source
- guide plate
- source device
- light guide
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Liquid Crystal (AREA)
- Planar Illumination Modules (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Light Guides In General And Applications Therefor (AREA)
Abstract
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
いられる面光源装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is mounted on 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 a backlight thereof. The present invention relates to a surface light source device used as.
【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 transparent plate located on the back surface of a liquid crystal panel is used as a light incident part, and The surface of the light-transmitting plate opposite to the surface close to the liquid crystal panel was densely coated with a light-scattering substance by means such as coating or adhering as the distance from the light-incident part was increased, and the surface was covered with a specular 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。By the way, in general, such a surface light source device is required to have a uniform brightness over the entire surface regardless 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 have excellent mountability in response to downsizing 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。However, in the above-mentioned conventional apparatus, although a tentative evaluation is obtained in terms of uniformity of brightness, it is still unsatisfactory 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 translucent plate, so that the straight traveling light from the light source in the translucent plate cannot be effectively utilized.
【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 light, in Japanese Utility Model Laid-Open No. 2-126185 (conventional example 2), one side of the light guide is formed into a wedge-shaped cross section, and this slope is used as an incident end surface. Innumerable hairline-shaped rough surfaces 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。However, this product has poor productivity and mountability because it is necessary to apply innumerable hairlines, and there is a problem in terms of uniformity of brightness.
【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 the conventional problems described above, and to provide a surface light source device which can obtain a uniform surface brightness without reducing the brightness of the light source and is excellent in mountability.
【０００８】[0008]
【課題を解決するための手段】上記目的を達成するため
に、本発明の一形態による面光源装置は、表裏面を有す
る導光板と、導光板の裏面側に配置された光反射部材
と、導光板の少なくとも一端面に配設された光源とを備
えた面光源装置において、前記導光板の表裏面のうちの
少なくとも一面に、所定配列された環状の凹部または凸
部を形成したことを特徴とする。In order to achieve the above object, a surface light source device according to one embodiment of the present invention includes a light guide plate having front and back surfaces, and a light reflecting member arranged on the back surface side of the light guide plate. In a surface light source device including a light source disposed on at least one end surface of a light guide plate, a predetermined array of annular recesses or protrusions is formed on at least one of the front and back surfaces of the light guide plate. And
【０００９】また、本発明の他の形態による面光源装置
は、前記環状の凹部または凸部は前記光源から遠ざかる
に従い深さまたは高さが増大することを特徴とする。A surface light source device according to another aspect of the present invention is characterized in that the depth or height of the annular concave portion or convex portion increases as the distance from the light source increases.
【００１０】さらに、前記環状の凹部または凸部は前記
光源から遠ざかるに従い光源からの入力方向と直交する
方向の外側投影面積が増大することを特徴とする。Further, the annular concave portion or the convex portion is characterized in that an outer projection area in a direction orthogonal to an input direction from the light source increases as the distance from the light source increases.
【００１１】また、面光源装置はさらに前記導光板の表
面側に配置された光拡散部材を備えることが好ましい。Further, it is preferable that the surface light source device further comprises a light diffusing member arranged on the front surface side of the light guide plate.
【００１２】また、前記光反射部材はさらに導光板の側
端面にも配設されていることが好ましい。Further, it is preferable that the light reflecting member is also disposed on a side end surface of the light guide plate.
【００１３】さらに、前記導光板の表裏面に配設された
環状の凹部または凸部は、表面側のものが裏面側のもの
に比べ小さくてもよい。Further, the annular recesses or protrusions provided on the front and back surfaces of the light guide plate may be smaller on the front surface side than on the back surface side.
【００１４】[0014]
【作用】本発明の面光源装置によれば、導光板の少なく
とも一端面に配設された光源から光が入射されると、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または凸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、環状の凹部または
凸部は光の方向を変換する効率のよい側面壁が増大され
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。According to the surface light source device of the present invention, when light is incident from the light source disposed on at least one end surface of the light guide plate, a part of the upward light traveling toward the front surface is transmitted through the front surface and is directed upward. Toward the back side. Further, a part of the downward light traveling toward the back surface side is reflected, and a part of the light is transmitted through the back surface, and then is reflected by the light reflecting member to become upward light. Further, the straight light parallel to the front and back surfaces of the light guide plate and slightly inclined is transmitted and reflected each time it hits the annular concave portion or convex portion, and a part thereof is converted into the above-mentioned upward or downward light. The above is repeated and the light incident from the light source is guided upward. However, since the annular concave or convex portion has increased side walls that efficiently change the direction of light, the frequency of light reflection is remarkably increased, and uniform brightness is maintained while the light intensity of the light source is maintained. Surface brightness is obtained.
【００１５】また、環状の凹部または凸部は光源から遠
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 or convex 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 intensity is increased. The frequency of reflection further increases at a long distance from the light source, and as a result, a surface brightness having a uniform brightness can be obtained while maintaining the light intensity of the light source.
【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 the figure, 10 is a liquid crystal panel which is a liquid crystal display device, and 20 is a surface light source device according to the present invention. The surface light source device 20 includes a light diffusing sheet 22 as a light diffusing member arranged on the back surface of the liquid crystal panel 10, a light guide plate 24 arranged on the back surface of the light diffusing 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 is composed of a mixture of diffusible particles for uniformizing the irradiation light of the liquid crystal panel 10 or a roughened surface thereof. 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 reflection sheet 26 is, for example, a polyester or polycarbonate film, in which a white pigment is kneaded, and reflects the light passing through the light guide plate 24, which will be described later, to the light guide plate 24 side again. In the illustrated example, the light reflection sheet 26 is provided only on the back surface 24C of the light guide plate 24, but it 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-shaped product.
【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 arranged so as to face the incident end faces 24A, 24A of the light guide plate 24. In this embodiment, the light guide plate 24 is arranged on both end faces, but it 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 acrylic resin, and is a plate whose front and back surfaces are parallel to each other as described above. A large number of annular recesses 30, 30, ... Are formed on the front surface 24B and the back surface 24C. As can be seen from FIGS. 4 and 5, the annular recess 30 moves away from the incident end face 24A where the linear light source 28 is located (in this embodiment, as it 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, and 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. Is formed. That is, the example shown in FIG.
0 has an outer diameter D 0 and an inner diameter D i , and the pitch between odd columns and odd rows and the pitch between even columns and even rows are both d, and odd columns, even columns and odd rows And the pitch of the even-numbered rows is arranged in a relationship of d / 2, that is, in a so-called zigzag pattern, and the outer diameter D 0 and the inner diameter D i of each annular recess 30 are gradually expanded as the distance from the incident end face 24A increases. 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 recess 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。Although the annular recess 30 illustrated in FIG. 6 has a double circular shape in plan view, in addition to this, as shown in FIGS. 7A to 7E, various shapes such as a circle, a quadrangle, or a triangle can be used. You may make it the combined form. Furthermore, FIG.
As shown in (J), the shape is not limited to a simple annular recess,
A double annular recess, that is, the annular recess 30 may be arranged around the central recess 30-1. By doing so, the degree of irregular reflection of incident light is increased and the effect is further enhanced.
【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 this specification is meant to include such double and triple protrusions, including the case of convex portions 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 of manufacturing the above-mentioned light guide plate 24 will be described. Although illustration is omitted, a molding die of a type in which two mold halves are joined and a molding space in which parallel planes face each other is formed therein is used. First, a photoresist is applied to the surface of each mold half, and then the array pattern of the annular recesses 30 described above is exposed, and further the annular recesses 3 are formed.
The other portion is eroded to a predetermined depth by etching so that the corresponding portion of 0 remains. Then, the remaining resist is removed. In this state, annular projections of a predetermined height are formed on the surface of the mold so that the projected area in the 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 electric discharge machining is applied to the annular convex portion, and the annular convex portion is removed so that the height thereof decreases as it approaches the one end face. After that, the two mold halves are combined, and a material such as 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, upward light traveling toward the front surface 24B side of the light guide plate 24 partially passes through the front surface 24B toward the light diffusing sheet 22, and partially reflects toward the rear surface 24C side. Further, a part of the downward light traveling toward the back surface 24C is reflected by the back surface 24C, and a part of the light is transmitted through the back surface 24C, and then is reflected by the light reflection sheet 26 to become upward light that can be used as illumination light. Further, as shown in FIG. 8, the straight light parallel and slightly inclined to the front and back surfaces of the light guide plate 24 is transmitted and reflected each time it hits the annular recess 30, and a part thereof is converted into the above-mentioned upward or downward light. . An annular recess increases the number of side walls that efficiently change the direction of light, as compared with a case where only a recess is formed, so that the frequency of light reflection is significantly increased. In this way, transmission and reflection are repeated and the light source 2
The light incident from 8 is guided to the light diffusion sheet 22,
The annular recesses 30 are arranged so that the depth gradually increases and the projected area increases as the distance from the light source 28 increases, so that the reflection frequency increases at the far light guide distance position from the light source 28 where the light intensity decreases. As a result, surface brightness with uniform brightness can be obtained in the diffusion sheet while the light intensity of the light source 28 is maintained.
【００２７】次に、本発明の他の実施例につき説明す
る。本実施例は前実施例における導光板２４の表裏面に
環状凹部３０を形成するのに代えて、環状凸部３０′を
形成するようにしたものである。図９に示す断面形状以
外は変わるところがないので、前実施例の説明のために
用いた図１ないし図３、図６および図７をそのまま用
い、凹部を凸部と読み変えることで重複説明を避ける。
また同一符号は同一部位を表わす。Next, another embodiment of the present invention will be described. In the present embodiment, instead of forming the annular concave portion 30 on the front and back surfaces of the light guide plate 24 in the previous embodiment, an annular convex portion 30 'is formed. Since there is no change except for the cross-sectional shape shown in FIG. 9, the same explanation as in FIGS. 1 to 3, 6, and 7 used for the description of the previous embodiment is used as it is, and the concave portion is read as the convex portion, and the duplicate description will be repeated. avoid.
Further, the same symbols represent the same parts.
【００２８】かかる環状凸部３０′を備えた導光板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
が、前述の環状凹部３０の場合と同様に、方向変換効率
の高い側面壁の存在のために、導光板２４の表裏面に対
し若干傾斜した直進光が、図１０に示すように環状凸部
３０′の側面壁に当る度毎に透過および反射して光拡散
シート２２に導かれる。A light guide plate 24 having such an annular convex portion 30 '.
In the surface light source device 20 using the light, when a voltage is applied to the linear light source 28, light is incident from the incident end face 24A. Due to the existence of the light guide plate 24, the straight light slightly inclined with respect to the front and back surfaces of the light guide plate 24 is transmitted and reflected each time it hits the side wall of the annular convex portion 30 'as shown in FIG. Be guided.
【００２９】なお、かかる環状凸部を形成するには、前
実施例とは逆に、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、環状凸部３０′の配列パターンを
露光し、該環状凸部３０′の対応部位をエッチングによ
り所定の深さ侵食して環状凹部を形成し、さらに、表面
を一端面に近づくに従い環状凹部が浅くなるように削除
すればよい。そして、環状凹部３０を形成したのと同様
な射出成形により環状凸部３０′を備えた導光板２４を
製作することができる。ただし、この場合には、導光板
２４の表裏面２４Ｂ，２４Ｃが平行とならず、表裏面上
の環状凸部３０′の頂面が平行となることに留意する必
要がある。Incidentally, in order to form such an annular convex portion, contrary to the previous embodiment, a photoresist is applied to the surface of each mold half, and then the array pattern of the annular convex portions 30 'is exposed, Corresponding portions of the annular convex portion 30 'may be eroded to a predetermined depth by etching to form an annular concave portion, and further the surface may be removed so that the annular concave portion becomes shallower as it approaches one end surface. Then, the light guide plate 24 having the annular convex portion 30 ′ can be manufactured by the injection molding similar to that in which the annular concave portion 30 is formed. However, in this case, it should be noted that the front and back surfaces 24B and 24C of the light guide plate 24 are not parallel, and the top surfaces of the annular convex portions 30 'on the front and back surfaces are parallel.
【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また
は環状凸部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３０または環状凸部３０′と裏面２
４Ｃ側に配設された環状凹部３０または環状凸部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
Although the example of arranging the light diffusion sheet 22 on the front surface side of the above is not essential, the refraction light from the back surface of the light guide plate 24 is balanced, for example, the annular concave portion 30 or the annular convex portion 30 '. It may not be used when uniform surface emission can be obtained by optimally setting the rate of change in size. In this case, in particular, the annular concave portion 30 or annular convex portion 30 'and the rear surface 2 arranged on the front surface 24B side of the light guide plate 24.
Annular recess 30 or annular projection 30 'disposed on the 4C side
It is effective to make the size of, and the depth or height thereof different from the projected area so that the front side is smaller than the back side.
【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、凹部または環状凸部の形状
については前述のように種々の変形が可能である。In the above embodiment, the linear light sources are arranged on both end faces of the light guide plate. However, depending on the size of the surface light source device, one end face may be used, and the light source is also a point light source. Good. The shape of the concave portion or the annular convex 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 embodiment provided with the above-mentioned annular recess, the front and back surfaces of the light guide plate are parallel to each other. However, this is not essential, and one surface has a flat inclined surface or a predetermined curvature. Even a sloped surface having a radius is within the range intended by the present invention.
【００３３】[0033]
【発明の効果】以上の説明から明らかな通り、本発明の
面光源装置によれば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。As is apparent from the above description, according to the surface light source device of the present invention, uniform surface brightness can be obtained without reducing the brightness of the light source, and since a different shape is not used, the mountability is excellent. ing.
【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 an 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 an 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。5 is a detailed view of a portion B in FIG.
【図６】本発明一実施例における凹部または環状凸部の
配列パターンを示す平面図である。FIG. 6 is a plan view showing an array pattern of concave portions or annular convex portions in the embodiment of the present invention.
【図７】本発明実施例における凹部または環状凸部の他
の種々なる形状を示す平面図である。FIG. 7 is a plan view showing various other shapes of the concave portion or the annular convex 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。FIG. 8 is a detailed view of parts C and D of FIG.
【図９】本発明の他の実施例の図４に対応するＡ部詳細
図である。FIG. 9 is a detailed view of an A part corresponding to FIG. 4 of another embodiment of the present invention.
【図１０】本発明の他の実施例の図８に対応する拡大詳
細図である。FIG. 10 is an enlarged detail view corresponding to FIG. 8 of another embodiment of the present invention.
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 ３０′ 環状凸部 10 Liquid Crystal Panel 20 Surface Light Source Device 22 Light Diffusing Sheet 24 Light Guide Plate 24A Incident End Face 26 Light Reflecting Sheet 28 Linear Light Source 30 Annular Recess 30 'Annular Convex
Claims (6)
側に配置された光反射部材と、導光板の少なくとも一端
面に配設された光源とを備えた面光源装置において、 前記導光板の表裏面のうちの少なくとも一面に、所定配
列された環状の凹部または凸部を形成したことを特徴と
する面光源装置。1. A surface light source device comprising: a light guide plate having front and back surfaces; a light reflecting member arranged on the back surface side of the light guide plate; and a light source arranged on at least one end surface of the light guide plate. 1. A surface light source device characterized in that annular recesses or protrusions are arranged in a predetermined arrangement on at least one of the front and back surfaces of a light plate.
ら遠ざかるに従い深さまたは高さが増大することを特徴
とする請求項１に記載の面光源装置。2. The surface light source device according to claim 1, wherein the annular recess or protrusion has a depth or a height that increases with distance from the light source.
ら遠ざかるに従い光源からの入力方向と直交する方向の
外側投影面積が増大することを特徴とする請求項１また
は２に記載の面光源装置。3. The surface light source device according to claim 1, wherein the annular concave portion or the convex portion has an outer projection area increasing in a direction orthogonal to an input direction from the light source as the distance from the light source increases. .
に配置された光拡散部材を備えることを特徴とする請求
項１ないし３のいずれかに記載の面光源装置。4. The surface light source device according to claim 1, further comprising a light diffusing member arranged on the front surface side of the light guide plate.
にも配設されていることを特徴とする請求項１ないし４
のいずれかに記載の面光源装置。5. The light reflecting member is further arranged on the side end surface of the light guide plate.
2. The surface light source device according to any one of 1.
凹部または凸部は、表面側のものが裏面側のものに比べ
小さいことを特徴とする請求項１ないし５のいずれかに
記載の面光源装置。6. The annular concave portion or convex portion provided on the front and back surfaces of the light guide plate is smaller on the front surface side than on the rear surface side, according to any one of claims 1 to 5. The surface light source device described.
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 true JPH0843635A (en) | 1996-02-16 |
| JP3325710B2 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) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6530671B2 (en) | 1997-01-30 | 2003-03-11 | Hitachi Electronic Devices Co. Ltd. | Liquid crystal display |
| US6661479B2 (en) | 1997-07-31 | 2003-12-09 | Hitachi, Ltd. | Liquid crystal display apparatus |
| US7131764B2 (en) | 2004-06-07 | 2006-11-07 | Nano Precision Corporation | Backlight apparatus |
| 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 |
| CN100454087C (en) * | 2003-02-28 | 2009-01-21 | 夏普株式会社 | Radiance converting element, producing method thereof and liquid-crystal displaying device |
| JP2009103943A (en) * | 2007-10-24 | 2009-05-14 | Hitachi Ltd | Liquid crystal display |
| JP2010056094A (en) * | 1999-02-23 | 2010-03-11 | Solid State Opto Ltd | Light-emitting panel assembly |
| US8322905B2 (en) | 1999-02-23 | 2012-12-04 | Rambus International Ltd. | Edgelit panel with curvilinear light extracting deformities |
| CN104033770A (en) * | 2014-06-23 | 2014-09-10 | 王富强 | Even-intensity light guide strip |
-
1994
- 1994-07-27 JP JP17556594A patent/JP3325710B2/en not_active Expired - Lifetime
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6530671B2 (en) | 1997-01-30 | 2003-03-11 | Hitachi Electronic Devices Co. Ltd. | Liquid crystal display |
| US6661479B2 (en) | 1997-07-31 | 2003-12-09 | Hitachi, Ltd. | Liquid crystal display apparatus |
| US6803977B2 (en) | 1997-07-31 | 2004-10-12 | Hitachi, Ltd. | Liquid crystal display apparatus |
| US6958790B2 (en) | 1997-07-31 | 2005-10-25 | Hitachi, Ltd. | Liquid crystal display apparatus |
| JP2010056094A (en) * | 1999-02-23 | 2010-03-11 | Solid State Opto Ltd | Light-emitting panel assembly |
| US8322905B2 (en) | 1999-02-23 | 2012-12-04 | Rambus International Ltd. | Edgelit panel with curvilinear light extracting deformities |
| 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 |
| CN100454087C (en) * | 2003-02-28 | 2009-01-21 | 夏普株式会社 | Radiance converting element, producing method thereof and liquid-crystal displaying device |
| US7131764B2 (en) | 2004-06-07 | 2006-11-07 | Nano Precision Corporation | Backlight apparatus |
| JP2009103943A (en) * | 2007-10-24 | 2009-05-14 | Hitachi Ltd | Liquid crystal display |
| CN104033770A (en) * | 2014-06-23 | 2014-09-10 | 王富强 | Even-intensity light guide strip |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3325710B2 (en) | 2002-09-17 |
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