JPH0963331A - Sheet-like light source device - Google Patents
Sheet-like light source deviceInfo
- Publication number
- JPH0963331A JPH0963331A JP7230804A JP23080495A JPH0963331A JP H0963331 A JPH0963331 A JP H0963331A JP 7230804 A JP7230804 A JP 7230804A JP 23080495 A JP23080495 A JP 23080495A JP H0963331 A JPH0963331 A JP H0963331A
- Authority
- JP
- Japan
- Prior art keywords
- light source
- source device
- transparent resin
- light
- resin substrate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Liquid Crystal (AREA)
- Planar Illumination Modules (AREA)
- Light Guides In General And Applications Therefor (AREA)
- Optical Elements Other Than Lenses (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、看板や各種表示装
置等の背面照明に用いる薄型の面状光源装置に関するも
のであり、特に液晶表示装置の背面照明手段として好適
に使用されるものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thin planar light source device used for back lighting of signboards, various display devices and the like, and is particularly preferably used as back lighting means for liquid crystal display devices. .
【０００２】[0002]
【従来の技術】従来、薄型の面状光源装置としては、サ
イドライト方式（導光板方式）が知られている。サイド
ライト方式の面状光源装置の第１の従来例として、その
構造は、図２に示すように、アクリル樹脂等の透光性の
高い材料による略断面矩形状の透明樹脂基板２１の裏面
２２には、白色または乳白色インクにより、一端側から
他端側にいくにつれてその密度が変化するように、通常
スクリーン印刷方式により印刷された散乱パターン２３
が施されている。さらに、該散乱パターン２３の後方に
は、反射板２４が配置されている。また、透明樹脂基板
２１の表面２５には、拡散板２６が配置されている。2. Description of the Related Art Conventionally, a side light system (light guide plate system) has been known as a thin planar light source device. As a first conventional example of a sidelight type planar light source device, as shown in FIG. 2, the structure is a back surface 22 of a transparent resin substrate 21 having a substantially rectangular cross section made of a highly transparent material such as acrylic resin. Is a scattering pattern 23 printed by a normal screen printing method such that the density of the white or milky white ink changes from one end side to the other end side.
Is given. Further, a reflecting plate 24 is arranged behind the scattering pattern 23. A diffusion plate 26 is arranged on the surface 25 of the transparent resin substrate 21.
【０００３】透明樹脂基板２１の端面２７には、直線状
光源である蛍光管２８が透明樹脂基板２１の端面２７と
ほぼ当接するように置かれており、その蛍光管２８の外
周面でかつ前記端面２７を向いた面以外の部分は、アル
ミニウム、銀等を蒸着した反射フィルム２９で覆われて
いる。蛍光管２８が置かれている以外の少なくとも一面
の透明樹脂基板２１の端面は、反射テープ等の反射材３
０が付加されている。（例えば、特開昭６３−６２１０
５号公報参照）A fluorescent tube 28, which is a linear light source, is placed on the end surface 27 of the transparent resin substrate 21 so as to be substantially in contact with the end surface 27 of the transparent resin substrate 21. The portion other than the surface facing the end face 27 is covered with a reflective film 29 formed by vapor deposition of aluminum, silver or the like. The end surface of at least one surface of the transparent resin substrate 21 other than the fluorescent tube 28 is placed on the reflective material 3 such as a reflective tape.
0 is added. (For example, JP-A-63-6210
(See Publication No. 5)
【０００４】図３は、このように構成されたサイドライ
ト方式の面状光源装置における光線の挙動を説明するた
めの模式的な断面図である。これを説明すると、蛍光管
２８からの発光光線は、反射フィルム２９により反射さ
れるので、多くが透明樹脂基板２１の端面２７に到達
し、透明樹脂基板２１の内部に進入する。この光線の
内、透明樹脂基板２１の裏面２２に印刷されている散乱
パターン２３に当たる光線３１だけが散乱され反射し、
透明樹脂基板２１の表面に達する散乱された光線３２及
び散乱パターン２３を透過し裏面に抜けて反射板２４に
当たって反射し透明樹脂基板２１の表面２５に向かう光
線３３の２つの光線は、符号３４で示すように、拡散板
２６を透過して表面２５に放射される。FIG. 3 is a schematic cross-sectional view for explaining the behavior of light rays in the side light type planar light source device having such a configuration. Explaining this, since the light emitted from the fluorescent tube 28 is reflected by the reflective film 29, most of it reaches the end surface 27 of the transparent resin substrate 21 and enters the inside of the transparent resin substrate 21. Of this light ray, only the light ray 31 that hits the scattering pattern 23 printed on the back surface 22 of the transparent resin substrate 21 is scattered and reflected,
Two light rays, a scattered light ray 32 that reaches the front surface of the transparent resin substrate 21 and a light ray 33 that passes through the scattering pattern 23, passes through the back surface, strikes the reflection plate 24, is reflected, and travels toward the front surface 25 of the transparent resin substrate 21, are denoted by reference numeral 34. As shown, it is transmitted through diffuser plate 26 and radiated to surface 25.
【０００５】透明樹脂基板２１の裏面２２に施された散
乱パターン２３に当たらない光線３５及び発光されてす
ぐに透明樹脂基板２１の表面２５に当たる光線３６は散
乱パターン２３に到達するまでそのまま内部で全反射を
繰り返して進む。出射光が全画面上で均一な発光強度に
なるよう光源からの距離に応じて散乱パターンに密度分
布を与えていることにより、比較的高輝度でしかも均一
な面状光源が実現可能となっている。A light ray 35 which does not hit the scattering pattern 23 applied to the back surface 22 of the transparent resin substrate 21 and a light ray 36 which hits the front surface 25 of the transparent resin substrate 21 immediately after being emitted are entirely kept inside until reaching the scattering pattern 23. Repeat reflection and proceed. By providing a density distribution in the scattering pattern according to the distance from the light source so that the emitted light has a uniform emission intensity on the entire screen, it is possible to realize a planar light source with comparatively high brightness. There is.
【０００６】ところで、面状光源装置の表面２５に設け
られた拡散板２６は、透明樹脂基板２１の裏面に印刷さ
れた散乱パターン２３のみが輝いて見えるいわゆるドッ
トイメージを除去し、面状の均一発光を実現する部材と
して使用するもので、光を拡散する機能の有するものを
用いる。この拡散板２６の構成は、例えば実用新案登録
番号第３０１０８７１号に開示される物品である拡散シ
ートを一例として説明すると、図４に示すように、透明
支持体３７上に、拡散部材としてのアクリル樹脂等の中
にポリスチレン樹脂の真球状の粒子３８を混入した透明
樹脂層３９を設けるものである。By the way, the diffuser plate 26 provided on the front surface 25 of the planar light source device removes a so-called dot image in which only the scattering pattern 23 printed on the rear surface of the transparent resin substrate 21 is shining, and the planar surface is uniform. It is used as a member for realizing light emission, and has a function of diffusing light. The structure of the diffusing plate 26 will be described, for example, by using a diffusing sheet, which is an article disclosed in Utility Model Registration No. 3010871, as an example, as shown in FIG. A transparent resin layer 39 in which true spherical particles 38 of polystyrene resin are mixed in resin or the like is provided.
【０００７】上記のような光学部材である拡散シートを
別体で拡散板２６として付加することにより、所望の特
性を得られるようになっていくが、部材の構成枚数が増
加することにより、間にある空気層と部材の界面が増え
る結果、表面反射率が増大し光線透過率（効率）が低下
する等の問題があり、また部品点数の増加による高コス
ト化のみならず、組立時の取扱性が悪化することによる
不良の増加等の問題もあった。By adding the diffusion sheet, which is an optical member, as a separate body as the diffusion plate 26, desired characteristics can be obtained, but as the number of constituent members increases, There is a problem that the surface reflectance increases and the light transmittance (efficiency) decreases as a result of the increase in the interface between the air layer and the member in the above. In addition to increasing the cost due to the increase in the number of parts, handling during assembly There was also a problem such as an increase in defects due to the deterioration of sex.
【０００８】そこで、部品点数を低減させることを意図
した図５に示す面状光源装置の第２の従来例として、そ
の構成を説明する。部品点数低減のため、上述の理由に
より、拡散板２６の装備をやめ、光を拡散する拡散板２
６と同等の機能を有するもので代用することとした。そ
の構成は、面状光源装置に備わる透明樹脂基板４１に光
拡散層４２を一体的に形成し、一体型基板４３とするも
のである。Therefore, the structure will be described as a second conventional example of the planar light source device shown in FIG. 5 intended to reduce the number of parts. To reduce the number of parts, for the above-mentioned reason, the diffuser plate 2 that disperses the diffuser plate 26 and diffuses light is discontinued.
It was decided to substitute the one having the same function as that of No. 6. The structure is such that the light diffusion layer 42 is integrally formed on the transparent resin substrate 41 included in the planar light source device to form the integrated substrate 43.
【０００９】一体型基板４３の表面側に形成される光拡
散層４２の構成は、光拡散部材としてアクリル樹脂また
はポリスチレン樹脂の真球状の光散乱粒子４４を透明材
料４５に混入、拡散してなる。ここで、透明材料４５
は、アクリル樹脂製とする。このような材料による構成
とすると、一体型基板４３内の透明樹脂基板４１と光拡
散層４２の屈折率は、ほぼ等しくなる。その他の面状光
源装置の構成は、前掲の従来例と同様である。The light diffusing layer 42 formed on the front surface side of the integrated substrate 43 is formed by mixing and diffusing spherical light scattering particles 44 of acrylic resin or polystyrene resin as a light diffusing member in a transparent material 45. . Here, the transparent material 45
Shall be made of acrylic resin. With such a structure, the transparent resin substrate 41 and the light diffusion layer 42 in the integrated substrate 43 have almost the same refractive index. Other configurations of the planar light source device are similar to those of the above-mentioned conventional example.
【００１０】該面状光源装置内における前掲の従来例と
異なる光の挙動は、透明樹脂基板４１と、光乱散粒子４
４（アクリル樹脂製またはポリスチレン樹脂製）を含ん
だ透明材料４５（アクリル樹脂製）からなる光拡散層４
２の屈折率がほぼ等しいことから、蛍光管２８から発光
した発光光線のうち、一体型基板４３の表面５側に到達
する光線４６は、光拡散層４２に侵入し、光散乱粒子４
４により拡散され、面状光源装置の画面から外部へ放射
される（図５の光線４７）。The behavior of light in the planar light source device different from the above-mentioned conventional example is that the transparent resin substrate 41 and the light scattering particles 4 are used.
Light diffusion layer 4 made of transparent material 45 (made of acrylic resin) containing 4 (made of acrylic resin or polystyrene resin)
Of the light rays emitted from the fluorescent tube 28, the light rays 46 reaching the surface 5 side of the integrated substrate 43 enter the light diffusion layer 42 and the light scattering particles 4 because the refractive indices of 2 are almost equal.
4 and is radiated to the outside from the screen of the planar light source device (light ray 47 in FIG. 5).
【００１１】図５において、面状光源装置の左側部分
は、光源である蛍光管２８に近いため、表面２５に到達
する発光光線の量は多い。一方、蛍光管２８から遠ざか
り、右側にいくほど、表面２５に到達する発光光線の量
も減少する。ところが、本従来例では、上述したような
光線の挙動が起こるので、発光光線が表面２５に到達す
ると、光拡散層４２に進入して光散乱粒子４４により拡
散され、外部に放射されてしまう。ゆえに、表面２５に
到達する発光光線の量が多い蛍光管２８に近い図５の左
側では画面は明るく、蛍光管２８から遠ざかり図５の右
側にいくにつれ、放射される発光光線の量が減少するの
で、画面は徐々に暗くなる。In FIG. 5, the left side portion of the planar light source device is close to the fluorescent tube 28, which is a light source, so that the amount of emitted light rays reaching the surface 25 is large. On the other hand, as the distance from the fluorescent tube 28 increases and the distance to the right side increases, the amount of emitted light rays reaching the surface 25 also decreases. However, in this conventional example, since the above-described behavior of the light beam occurs, when the emitted light beam reaches the surface 25, it enters the light diffusion layer 42, is diffused by the light scattering particles 44, and is emitted to the outside. Therefore, the screen is bright on the left side of FIG. 5 which is close to the fluorescent tube 28 where the amount of emitted light reaching the surface 25 is large, and the amount of emitted emitted light decreases as the distance from the fluorescent tube 28 increases to the right side of FIG. Therefore, the screen becomes dark gradually.
【００１２】このように、透明樹脂基板４１と略等しい
屈折率からなる光拡散層４２を設け一体型基板４３とし
て面状光源装置を構成すると、画面上での明るさのバラ
ンスが崩れてしまうため、画面全体に渡って均一な面状
光源を実現することは極めて困難である。As described above, when the planar light source device is configured as the integrated substrate 43 by providing the light diffusing layer 42 having a refractive index substantially equal to that of the transparent resin substrate 41, the brightness balance on the screen is lost. However, it is extremely difficult to realize a planar light source that is uniform over the entire screen.
【００１３】[0013]
【発明が解決しようとする課題】上記のように、全画面
上で均一な発光強度を保持し、しかも高輝度な面状光源
装置は、図２に一例として示した第１の従来例がある。
ところが、部品点数が多いことから、高コスト化、不良
の増加、取扱の不便等、改善されるべきさまざまな問題
を有していた。これらの問題の解決手段となる部品点数
の削減にむけて第２の従来例を示した。しかし、このよ
うな従来例の装置では、面状光源装置として機能するた
めに不可欠な要素である全画面上で均一な発光強度とな
ることが満たされなくなってしまった。As described above, there is the first conventional example shown in FIG. 2 as an example of the planar light source device which maintains a uniform emission intensity on the entire screen and has a high brightness. .
However, because of the large number of parts, there are various problems that need to be improved, such as high cost, increase in defects, and inconvenience in handling. A second conventional example has been shown in order to reduce the number of parts which are means for solving these problems. However, in such a conventional device, it is no longer sufficient to achieve a uniform emission intensity on the entire screen, which is an essential element for functioning as a surface light source device.
【００１４】以上の事情を鑑みて、本発明の目的とする
ところは、構成部品を低減したのにもかかわらず、従来
の機能を失うことのない面状光源装置を提供しようとす
るものである。In view of the above circumstances, it is an object of the present invention to provide a planar light source device which does not lose its conventional function despite the reduction in the number of components. .
【００１６】[0016]
【課題を解決するための手段】上記目的を達成するため
に、請求項１の発明は、透明樹脂基板の少なくとも１つ
以上の端面に１本または複数本の直線状の蛍光管を配置
させて構成するいわゆるサイドライト方式の面状光源装
置において、後述する理由により、該透明樹脂基板の表
面に少なくとも透明樹脂基板よりも屈折率の低い透明材
料中に多数の光散乱粒子を混入、分散してなる光拡散層
を密着形成させ、一体化したことを特徴とする面状光源
装置である。In order to achieve the above object, the invention of claim 1 is one in which at least one end face of a transparent resin substrate is provided with one or more linear fluorescent tubes. In a so-called sidelight type planar light source device configured, a large number of light scattering particles are mixed and dispersed in a transparent material having a refractive index lower than that of at least the transparent resin substrate on the surface of the transparent resin substrate for a reason described later. The surface light source device is characterized in that the following light diffusion layer is closely formed and integrated.
【００１５】請求項２の発明は、上記請求項１記載の構
成に加えて、上記透明樹脂基板がアクリル樹脂により構
成され、透明材料がフッソ系樹脂から構成されているこ
とを特徴とする面状光源装置である。According to a second aspect of the present invention, in addition to the structure of the first aspect, the transparent resin substrate is made of an acrylic resin, and the transparent material is made of a fluorine-based resin. It is a light source device.
【００１７】また、請求項３の発明は、上記請求項２記
載の構成に加えて、上記光散乱粒子の形状を球として光
拡散層に混入、分散したことを特徴とする面状光源装置
である。Further, the invention of claim 3 is, in addition to the structure of claim 2, a planar light source device characterized in that the shape of the light scattering particles is mixed and dispersed in the light diffusion layer as a sphere. is there.
【００１８】[0018]
【発明の実施の形態】本発明の面状光源装置の構造を図
１に基づいて説明する。図１において、１は透明樹脂基
板であり、アクリル樹脂等の透光性の高い材料からなる
略断面矩形状のものである。この透明樹脂基板１の裏面
２には白色または乳白色のインクを図３に示す従来の面
状光源装置と同様に一端側から他端側にいくにつれてそ
の密度が変化するように印刷された光散乱パターン３が
施されている。さらにその光散乱パターンの後方には、
反射板４が配置されている。DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the planar light source device of the present invention will be described with reference to FIG. In FIG. 1, reference numeral 1 denotes a transparent resin substrate having a substantially rectangular cross section made of a highly transparent material such as acrylic resin. On the back surface 2 of the transparent resin substrate 1, white or milky white ink is printed so that its density changes from one end side to the other end side in the same manner as in the conventional planar light source device shown in FIG. Pattern 3 is applied. Furthermore, behind the light scattering pattern,
The reflector 4 is arranged.
【００１９】一方、透明樹脂基板１の少なくとも一面以
上の端面７には、１本または複数本の直線状の光源であ
る冷陰極または熱陰極の蛍光管８が透明樹脂基板１の端
面７とほぼ当接するように配置されており、その蛍光管
８の外周であり、端面７に面していない部分は、アルミ
ニウム、銀等を蒸着した反射フィルム９で覆われてい
る。この反射フィルム９の両端は透明樹脂基板１の表裏
それぞれに接着されている。蛍光管８が配置されている
以外の少なくとも一面以上の透明樹脂基板１の側面に
は、反射テープ等の反射材１０が付加されている。On the other hand, on at least one or more end faces 7 of the transparent resin substrate 1, one or a plurality of cold cathode or hot cathode fluorescent tubes 8 which are linear light sources are formed substantially at the end face 7 of the transparent resin substrate 1. A portion of the fluorescent tube 8 which is arranged so as to come into contact with the outer periphery of the fluorescent tube 8 and which does not face the end face 7 is covered with a reflective film 9 on which aluminum, silver or the like is vapor-deposited. Both ends of the reflective film 9 are adhered to the front and back of the transparent resin substrate 1, respectively. A reflective material 10 such as a reflective tape is added to at least one side surface of the transparent resin substrate 1 other than where the fluorescent tube 8 is arranged.
【００２０】また、透明樹脂基板１の表面５には、少な
くとも透明樹脂基板１よりも屈折率の低い透明材料１１
中に光散乱粒子１２を混入、分散してなる光拡散層１３
を密着形成させ、透明樹脂基板１と一体的に構成した一
体型基板１４として構成する。On the surface 5 of the transparent resin substrate 1, a transparent material 11 having a refractive index lower than that of at least the transparent resin substrate 1 is formed.
Light diffusion layer 13 in which light scattering particles 12 are mixed and dispersed
Are formed in close contact with each other to form an integrated substrate 14 integrally formed with the transparent resin substrate 1.
【００２１】このような構成からなる本発明の面状光源
装置は、次のように作用する。蛍光管８の発した発光光
線のうち、透明樹脂基板１の表面５に到達する光線１５
は、光拡散層１３を構成する透明材料１１の屈折率が、
透明樹脂基板１よりも低いため、透明樹脂基板１の表面
５で全反射し、裏面２の方向に向かってに進行する。つ
まり、光拡散層１３が透明樹脂基板１と一体的に構成さ
れているにもかかわらず、図３における透明樹脂基板２
１内での光線３６の軌跡と一致する。したがって全面域
にわたって、均一な輝度を得られる。The planar light source device of the present invention having such a structure operates as follows. Of the light rays emitted from the fluorescent tube 8, the light rays 15 that reach the surface 5 of the transparent resin substrate 1.
Is the refractive index of the transparent material 11 forming the light diffusion layer 13,
Since the height is lower than that of the transparent resin substrate 1, the light is totally reflected on the front surface 5 of the transparent resin substrate 1 and proceeds toward the back surface 2. That is, although the light diffusion layer 13 is formed integrally with the transparent resin substrate 1, the transparent resin substrate 2 in FIG.
It coincides with the trajectory of the light ray 36 within 1. Therefore, uniform brightness can be obtained over the entire surface area.
【００２２】上述したように、高輝度で全画面上で均一
な発光強度を有する面状光源装置としては、透明樹脂基
板上に形成される透明樹脂層を、透明樹脂基板よりも屈
折率の低いものと限定する必要がある。As described above, as a planar light source device having high brightness and uniform emission intensity on the entire screen, the transparent resin layer formed on the transparent resin substrate has a lower refractive index than the transparent resin substrate. It is necessary to limit it to one.
【００２３】なお、本発明を実施するに際して用いる透
明樹脂基板は、その透明性、加工性からアクリル樹脂が
もっとも適しているが、特にこれに限定されるものでは
なく、これに換えて、塩化ビニール樹脂、ポリカーボメ
イト樹脂、オレフィン系樹脂スチレン系樹脂等の各種熱
可塑性の透明樹脂等が使用可能である。また、アリルジ
グリコールカーボネート樹脂等の熱硬化性樹脂や各種ガ
ラス材料等の無機材料等も透明であれば場合によっては
適用可能である。The transparent resin substrate used in the practice of the present invention is most preferably acrylic resin because of its transparency and workability, but it is not particularly limited to this, and instead of this, vinyl chloride is used. Various thermoplastic transparent resins such as resin, polycarbonate resin, olefin resin and styrene resin can be used. In addition, thermosetting resins such as allyl diglycol carbonate resin and inorganic materials such as various glass materials can be applied depending on the case as long as they are transparent.
【００２４】また、光拡散層を構成する透明材料は、基
本的には透明樹脂基板よりも屈折率が低ければ適用可能
であるが、より望ましくは、例えば透明樹脂基板として
アクリル樹脂（屈折率：１．４９）を選定した場合、屈
折率１．４以下の透明樹脂材料が望ましい。これを実現
する材料としては、フッソ系樹脂材料が適用可能であ
る。The transparent material forming the light diffusing layer is basically applicable as long as it has a lower refractive index than the transparent resin substrate, but more preferably, for example, an acrylic resin (refractive index: When 1.49) is selected, a transparent resin material having a refractive index of 1.4 or less is desirable. As a material that realizes this, a fluorine-based resin material can be applied.
【００２５】さらに本発明に係る光散乱粒子としては、
透明材料中に混入した状態で光散乱性を示せば、特に限
定するものではないが、例えばＴｉＯ2 、ＳｉＯ2 、Ｃ
ａＣＯ3 、Ａｌ2 Ｏ3 、ＢａＳＯ4 、ＺｎＯ、ガラス微
粉末等の無機系の光散乱材やまたはアクリル、ポリスチ
レン等の有機系の透明光散乱材であって、しかも透明材
料を溶媒に溶解した液状樹脂媒体に溶解または化学変化
をしない物質を選択することができる。またこれらを単
体で使用してもよいし、２種以上を混合して使用しても
よい。また光散乱粒子の形状は、特に限定するものでは
ないが、よりよい形態としては、球状の形態が望まし
い。Further, as the light scattering particles according to the present invention,
The material is not particularly limited as long as it exhibits a light scattering property in a state of being mixed in a transparent material. For example, TiO 2 , SiO 2 , C
An inorganic light-scattering material such as aCO 3 , Al 2 O 3 , BaSO 4 , ZnO, or glass fine powder, or an organic transparent light-scattering material such as acrylic or polystyrene, in which the transparent material is dissolved in a solvent. A substance that does not dissolve or chemically change in the liquid resin medium can be selected. These may be used alone or in combination of two or more. The shape of the light scattering particles is not particularly limited, but a spherical shape is preferable as a better shape.
【００２６】[0026]
【発明の効果】以上詳述したように、本発明の面状光源
装置においては、面状光源装置の表面に設置する光を拡
散させるための拡散板を、光拡散層として透明樹脂基板
と一体的に形成し、一体型基板としたことで、生産工程
の省略につながり、生産能率が向上する。また、部品点
数の個数の減少により、低コストで生産でき、組立時の
取扱も簡単である。そして、従来の面状光源装置と同様
に、画面全体が均一で高輝であり、光拡散層における光
の拡散によって、ドットイメージの除去もできる。As described above in detail, in the surface light source device of the present invention, the diffusion plate for diffusing the light installed on the surface of the surface light source device is integrated with the transparent resin substrate as a light diffusion layer. Since it is formed integrally to be an integrated type substrate, the production process is omitted and the production efficiency is improved. In addition, since the number of parts is reduced, it can be produced at low cost and the handling at the time of assembly is easy. As in the conventional planar light source device, the entire screen is uniform and bright, and the dot image can be removed by diffusing the light in the light diffusing layer.
【図１】本発明の面状光源装置の構造を示す断面図であ
る。FIG. 1 is a cross-sectional view showing the structure of a planar light source device of the present invention.
【図２】第１の従来例の面状光源装置の構造を示す断面
図である。FIG. 2 is a cross-sectional view showing a structure of a first conventional planar light source device.
【図３】面状光源装置における光線の挙動を説明するた
めの模式的な断面図である。FIG. 3 is a schematic cross-sectional view for explaining the behavior of light rays in the planar light source device.
【図４】拡散板を構成する拡散シートの断面図である。FIG. 4 is a sectional view of a diffusion sheet forming a diffusion plate.
【図５】第２の従来例の面状光源装置の構造を示す断面
図である。FIG. 5 is a cross-sectional view showing the structure of a second conventional planar light source device.
１ 透明樹脂基板 １１ 透明材料 １２ 光散乱粒子 １３ 光拡散層 １４ 一体型基板 1 Transparent Resin Substrate 11 Transparent Material 12 Light Scattering Particles 13 Light Diffusing Layer 14 Integrated Substrate
Claims (3)
面に１本または複数本の直線状の蛍光管を配置させて構
成するいわゆるサイドライト方式の面状光源装置におい
て、該透明樹脂基板の表面に少なくとも該透明樹脂基板
よりも屈折率の低い透明材料中に多数の光散乱粒子を混
入、分散してなる光拡散層を密着形成させ一体化したこ
とを特徴とする面状光源装置。1. A so-called sidelight type planar light source device in which one or more linear fluorescent tubes are arranged on at least one or more end faces of a transparent resin substrate, the surface of the transparent resin substrate. 2. A planar light source device characterized in that a light diffusing layer formed by mixing and dispersing a large number of light scattering particles in a transparent material having a refractive index at least lower than that of the transparent resin substrate is closely formed and integrated.
構成され、透明樹脂材料がフッソ系樹脂から構成されて
いることを特徴とした請求項１記載の面状光源装置。2. The planar light source device according to claim 1, wherein the transparent resin substrate is made of acrylic resin, and the transparent resin material is made of fluorine resin.
とした請求項２記載の面状光源装置。3. The planar light source device according to claim 2, wherein the light scattering particles are spherical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7230804A JPH0963331A (en) | 1995-08-16 | 1995-08-16 | Sheet-like light source device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7230804A JPH0963331A (en) | 1995-08-16 | 1995-08-16 | Sheet-like light source device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0963331A true JPH0963331A (en) | 1997-03-07 |
Family
ID=16913541
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7230804A Pending JPH0963331A (en) | 1995-08-16 | 1995-08-16 | Sheet-like light source device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0963331A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004055429A1 (en) * | 2002-12-18 | 2004-07-01 | Sharp Kabushiki Kaisha | Light guide plate, illuminating device using same, area light source and display |
| KR100773453B1 (en) * | 2005-11-18 | 2007-11-05 | (주)딕셀 | Backlight Unit and its manufacturing method |
| JP2015148730A (en) * | 2014-02-07 | 2015-08-20 | 日立アプライアンス株式会社 | Light diffusion member for led illumination and led illumination device using the same |
-
1995
- 1995-08-16 JP JP7230804A patent/JPH0963331A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004055429A1 (en) * | 2002-12-18 | 2004-07-01 | Sharp Kabushiki Kaisha | Light guide plate, illuminating device using same, area light source and display |
| KR100773453B1 (en) * | 2005-11-18 | 2007-11-05 | (주)딕셀 | Backlight Unit and its manufacturing method |
| JP2015148730A (en) * | 2014-02-07 | 2015-08-20 | 日立アプライアンス株式会社 | Light diffusion member for led illumination and led illumination device using the same |
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