JPH06324215A - Light source device - Google Patents
Light source deviceInfo
- Publication number
- JPH06324215A JPH06324215A JP5109171A JP10917193A JPH06324215A JP H06324215 A JPH06324215 A JP H06324215A JP 5109171 A JP5109171 A JP 5109171A JP 10917193 A JP10917193 A JP 10917193A JP H06324215 A JPH06324215 A JP H06324215A
- Authority
- JP
- Japan
- Prior art keywords
- light
- light source
- source device
- light guide
- fine particles
- 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
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、面状に出射発光する光
源装置に係わるものである。特に各種ディスプレイの光
源、液晶表示装置の背面光源等に適する光源装置に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light source device which emits and emits light in a plane. In particular, the present invention relates to a light source device suitable for a light source of various displays, a back light source of a liquid crystal display device, and the like.
【０００２】[0002]
【従来の技術】従来から薄型の看板、表示装置、照明器
具、液晶表示装置等に用いられる光源装置としては、板
状の透明樹脂製の導光体の側面に蛍光灯等の照明ランプ
を設け、一方の面から出射発光させる方式のものが知ら
れている。この様な光源装置には、出光面の明るさが全
面に渡り均一であることが望まれている。このため、該
導光体内部に含まれる光拡散剤に種々の工夫をこらした
り、背面に光拡散処理を施したりすることが提案されて
いる。2. Description of the Related Art Conventionally, as a light source device used for thin signboards, display devices, lighting fixtures, liquid crystal display devices, etc., an illumination lamp such as a fluorescent lamp is provided on the side surface of a plate-shaped transparent resin light guide. A method of emitting and emitting light from one surface is known. In such a light source device, it is desired that the brightness of the light emitting surface is uniform over the entire surface. Therefore, it has been proposed that the light diffusing agent contained in the light guide body be devised in various ways and that the back surface be subjected to a light diffusing treatment.
【０００３】例えば、実公昭58-46447号公報では、導光
板中に屈折率の異なる透明微粒子を光拡散剤として、導
光板の光入射面から反対面に向かって、その濃度が順次
高くなる様、含有させた液晶表示装置の照明用導光板を
提案している。また、特開平2-221924号公報では、導光
板中に光拡散用微粒子を導光体の光入射面から反対面に
向かって、その粒子径が順次小さいものを含むメタクリ
ル樹脂製導光板が提案されている。[0003] For example, in Japanese Utility Model Publication No. 58-46447, it is proposed that transparent fine particles having different refractive indexes are used as a light diffusing agent in a light guide plate so that the concentration thereof gradually increases from the light incident surface to the opposite surface of the light guide plate. , A light guide plate for illumination of a liquid crystal display device containing the same is proposed. Further, in Japanese Patent Laid-Open No. 2-221924, a methacrylic resin light guide plate is proposed in which light diffusing fine particles are included in the light guide plate from the light incident surface of the light guide toward the opposite surface thereof, the particle diameter of which gradually decreases. Has been done.
【０００４】特開平2-126501号公報には、導光体の裏面
側に光拡散性のインクで網点状に印刷し、しかもこの網
点の密度が光入射面から、遠くになる程順次高くし、中
間部と最遠部の間に最大密度となるように印刷した光源
パネルが提案されている。また、特開平4-145485号公報
には、導光体の裏面に光拡散処理を施し、導光体内に光
拡散用微粒子を包含させた導光体からなる光源装置が提
案されている。In Japanese Patent Laid-Open No. 2-126501, light-diffusing ink is used to print dots on the back side of a light guide, and the density of the dots is gradually increased as the distance from the light incident surface increases. There has been proposed a light source panel which is made high and printed so as to have the maximum density between the middle portion and the farthest portion. Further, Japanese Patent Laid-Open No. 4-145485 proposes a light source device including a light guide body in which light diffusion treatment is performed on the back surface of the light guide body, and light-diffusing fine particles are included in the light guide body.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、前述の
実公昭58-46447号公報や特開平2-221924号公報に提案の
ごとく、導光体中に含ませる光拡散剤の濃度分布を付け
たり、粒径分布を付けるのは、非常に煩雑であり、生産
性が低い。また、特開平2-126501号公報、特開平4-1454
85号公報に提案の導光体も裏面に光拡散処理を行う等煩
雑な処理を要する。However, as proposed in Japanese Utility Model Publication No. 58-46447 and Japanese Patent Application Laid-Open No. 2-221924, the concentration distribution of the light diffusing agent contained in the light guide may be added, Attaching a particle size distribution is very complicated and the productivity is low. Further, JP-A-2-126501 and JP-A-4-1454
The light guide proposed in Japanese Patent Publication No. 85 also requires complicated processing such as light diffusion processing on the back surface.
【０００６】そこで本発明は、樹脂の一般的な加工方法
で容易に得ることができる組成と形状の導光体で構成さ
れ、しかも出光面からの光量が均一で、かつ出光量の向
上も容易な光源装置を提供する。Therefore, the present invention is composed of a light guide having a composition and a shape which can be easily obtained by a general resin processing method, and moreover, the light quantity from the light emitting surface is uniform and the light quantity can be easily improved. A light source device is provided.
【０００７】[0007]
【課題を解決するための手段】本発明は、導光体の側面
に原光源からの光を入射して、面状に出射発光する光源
装置において、該導光体が、屈折率差が０．０２〜０．
２、平均粒径が０．１〜５０μｍの光拡散微粒子を、
〔数２〕式で表わされる量（Ｖ）、均一に分散した透明
性樹脂により形成されていることを特徴とする光源装置
である。SUMMARY OF THE INVENTION The present invention is a light source device in which light from an original light source is incident on a side surface of a light guide and is emitted and emitted in a planar shape, the light guide having a difference in refractive index of 0. .02-0.
2. Light-diffusing fine particles having an average particle diameter of 0.1 to 50 μm
The light source device is characterized in that it is formed of a transparent resin uniformly dispersed in an amount (V) represented by the formula [2].
【数２】 ０．５X/100 ／１００≦Ｖ≦（５Ｔ＋５０）／３Ｘ・・・（１） （式中、Ｖは光拡散微粒子添加量（％）、Ｔは導光体の
光入射側面の厚み（mm）、Ｘは導光体の光入射側面から
出光面最遠部までの距離（mm）である。）## EQU00002 ## 0.5 X / 100 / 100.ltoreq.V.ltoreq. (5T + 50) / 3X ... (1) (where, V is the amount of added light diffusing fine particles (%), and T is the light incident side surface of the light guide. (Mm), X is the distance (mm) from the light incident side surface of the light guide to the farthest light emitting surface.)
【０００８】本発明における導光体とは、側面の原光源
からの光を入射することによって、正面の方向に光を導
くものである。その形状は、光源装置によって、大きさ
は種々あるが大概板状である。その、厚み（Ｔ）は、大
概１〜２０mmであり、その長さ（Ｘ）つまり原光源から
の光の入射側面に対向している出光面最遠部の側面まで
の長さは５０〜２０００mm程度である。The light guide member in the present invention is a light guide member that guides light in the front direction by entering light from an original light source on the side surface. The shape is generally plate-like, although there are various sizes depending on the light source device. The thickness (T) is generally 1 to 20 mm, and the length (X), that is, the length to the side surface of the farthest light emitting surface facing the incident side surface of the light from the original light source is 50 to 2000 mm. It is a degree.
【０００９】本発明における光源装置とは、原光源から
の光を該導光体に入射し、光出射部から光を出射する装
置をいい、入射する光とは、異なった位置で、異なった
方向に光を出射するものである。その概要は、例えば、
実公昭58-46447号公報のごとく、導光体が板状であり、
該導光体の一方の端または両端に原光源の照明ランプを
設置し、該板状の一方の面から光を出射させるものがあ
る。The light source device in the present invention means a device which makes light from the original light source incident on the light guide member and emits light from the light emitting portion, and the incident light is different at different positions. The light is emitted in the direction. The outline is, for example,
As in Japanese Utility Model Publication No. 58-46447, the light guide is plate-shaped,
There is one in which an illumination lamp of an original light source is installed at one end or both ends of the light guide, and light is emitted from the one plate-shaped surface.
【００１０】本発明の原光源とは、線状光源、点状光源
のいずれでも良く、所謂冷陰極管や蛍光灯などが該当す
る。The original light source of the present invention may be either a linear light source or a point light source, and corresponds to a so-called cold cathode tube or a fluorescent lamp.
【００１１】本発明における透明性樹脂とは、全光線透
過率が８０％以上であればいかなる樹脂でも良い。例え
ば、メタアクリル酸メチル系樹脂（屈折率１．４９）、
スチレン系樹脂（屈折率１．５９）、ＭＳ樹脂（屈折率
１．５２〜１．５６）、ポリカーボネイト樹脂（屈折率
１．５８６）等が好適である。The transparent resin in the present invention may be any resin as long as the total light transmittance is 80% or more. For example, methyl methacrylate resin (refractive index 1.49),
Styrene resin (refractive index 1.59), MS resin (refractive index 1.52 to 1.56), polycarbonate resin (refractive index 1.586) and the like are suitable.
【００１２】本発明における光拡散微粒子とは、シリカ
（屈折率１．５４）、硫酸バリウム（屈折率１．６
４）、炭酸カルシウム（屈折率１．６６）等の無機微粒
子や、スチレン樹脂（屈折率１．５９）、シリコン樹脂
（屈折率１．４３）等の有機微粒子が挙げられ、これら
を単独でも良いし、２種以上組み合わせても良い。The light-diffusing fine particles in the present invention are silica (refractive index 1.54) and barium sulfate (refractive index 1.6.
4), inorganic fine particles such as calcium carbonate (refractive index 1.66) and organic fine particles such as styrene resin (refractive index 1.59) and silicon resin (refractive index 1.43), and these may be used alone. However, two or more kinds may be combined.
【００１３】該光拡散微粒子を選定に当り、その屈折率
が基材の透明樹脂の屈折率差が、０．０２〜０．２とな
るものとする。この差は、＋−のいずれでもよい。屈折
率差が０．０２より小さいと、光を散乱する効果が少な
くなり出光面の光量の向上も小さく、０．２より大きい
と、逆に光散乱効果が大きくなりすぎ、出光面の光量が
不均一になる。When selecting the light diffusing fine particles, the difference in the refractive index between the transparent resins of the base material is 0.02 to 0.2. This difference may be either + or-. When the refractive index difference is smaller than 0.02, the effect of scattering light is reduced and the improvement of the light amount on the light emitting surface is small, and when it is larger than 0.2, the light scattering effect is too large and the light amount on the light emitting surface is increased. It becomes uneven.
【００１４】該光拡散微粒子の平均粒径は、０．１〜５
０μｍである。平均粒径が０．１μｍより小さいと、光
散乱の効果が小さくなり平均粒径が５０μｍより大きい
と出光面の光量が不均一となる。The average particle diameter of the light diffusing fine particles is 0.1-5.
It is 0 μm. If the average particle diameter is smaller than 0.1 μm, the effect of light scattering becomes small, and if the average particle diameter is larger than 50 μm, the light quantity on the light emitting surface becomes non-uniform.
【００１５】導光体中、該光拡散微粒子の含有量は、
〔数２〕式で表わされる量（Ｖ）程度である。導光体の
出光面からより均一に発光するには、包含する光拡散微
粒子の量に適正な範囲があり、しかもこの範囲は、主と
して作製する導光体の形状のうち、光入射側面の厚みと
光入射側面から出光面最遠部までの距離により適正な範
囲がある。つまり、導光体中の該光拡散微粒子の含有量
が、〔数２〕式の内０．５X/100／１００で表わされる
量より少ないと出射面の光量が少く、〔数２〕式の内
（５Ｔ＋５０）／３Ｘで表わされる量より多いと、出光
面の光量にムラが発生する。The content of the light diffusing fine particles in the light guide is
It is about the amount (V) represented by the formula [2]. In order to emit light more uniformly from the light emitting surface of the light guide, there is an appropriate range for the amount of light diffusing fine particles to be included, and this range is mainly the thickness of the light incident side of the shape of the light guide to be produced. There is an appropriate range depending on the distance from the light incident side surface to the farthest part of the light emitting surface. That is, if the content of the light-diffusing fine particles in the light guide is less than the amount expressed by 0.5 X / 100/100 in the formula [2], the light amount on the emission surface is small, and the formula [2] If the amount is larger than the amount represented by (5T + 50) / 3X, unevenness occurs in the light amount on the light emitting surface.
【００１６】該透明性樹脂に、該光拡散微粒子を含有さ
せるには、通常の樹脂の混合方法が全て適用できる。例
えば、両者をＶ型ブレンダー、ヘンシェルミキサー、タ
ンブラー等で混合し、ミキシングロール、バンバリーミ
キサー、一軸、二軸のスクリュー押出機等で、溶融混練
する方法がある。或いは、該透明性樹脂を構成する単量
体、そのシロップに該光拡散微粒子を分散させ、これを
懸濁重合、塊状重合する方法もある。この時、必要に応
じて、安定剤、染料等を添加することもできる。In order to incorporate the light-diffusing fine particles into the transparent resin, all the usual resin mixing methods can be applied. For example, there is a method in which both are mixed with a V-type blender, a Henschel mixer, a tumbler, and the like, and melt-kneaded with a mixing roll, a Banbury mixer, a single-screw or twin-screw extruder, and the like. Alternatively, there is also a method in which the light-diffusing fine particles are dispersed in a monomer constituting the transparent resin, or a syrup thereof, and the suspension polymerization or bulk polymerization is performed. At this time, if necessary, stabilizers, dyes, etc. can be added.
【００１７】導光体の製造方法としては、特に制限はな
く、樹脂の一般的な成形加工方法が適用できる。つま
り、前述の該透明樹脂に該透明微粒子を含有させる際の
加工に引続き行うこともできる。つまり溶融混練におけ
る射出成形法、押し出し成形法等がある。また、該光拡
散微粒子を含有する単量体またはシロップの重合を所定
の形状の金型内で行う方法もある。The method of manufacturing the light guide is not particularly limited, and a general resin molding method can be applied. That is, the above-mentioned processing when the transparent resin contains the transparent fine particles can be performed subsequently. That is, there are an injection molding method and an extrusion molding method in the melt kneading. There is also a method of polymerizing a monomer or syrup containing the light diffusing fine particles in a mold having a predetermined shape.
【００１８】本発明の光源装置には、輝度を高める為に
該導光体の出光面、原光源からの光を入射する側面以外
の面に、周知の光反射させる処理や加工を施すのが望ま
しい。つまり鏡面シートのごとき反射膜を張り付けるご
ときである。しかし、該導光体の裏面に出光量を均一に
するための光拡散処理、例えば、白色塗料のドット印刷
等は無くても充分に均一な出光となる。In the light source device of the present invention, in order to increase the brightness, the light-exiting surface of the light guide and the surface other than the side surface on which the light from the original light source is incident are subjected to known light-reflecting treatment or processing. desirable. In other words, it is like sticking a reflective film such as a mirror sheet. However, even if there is no light diffusion process for making the amount of emitted light uniform on the back surface of the light guide, for example, dot printing of white paint, the emitted light is sufficiently uniform.
【００１９】[0019]
【発明の効果】本発明の光源装置は、出光面から均一に
出光する。なかでも、従来からの光源装置のごとき導光
体の裏面に光拡散処理が無くても均一に出光する。本発
明の光源装置は、液晶表示装置の背面光源、看板・表示
板の光源等に適用できる。The light source device of the present invention uniformly emits light from the light emitting surface. Above all, the light is uniformly emitted even if there is no light diffusion treatment on the back surface of the light guide such as the conventional light source device. INDUSTRIAL APPLICABILITY The light source device of the present invention can be applied to a back light source of a liquid crystal display device, a light source of a signboard / display board, and the like.
【００２０】[0020]
【実施例】実施例で輝度を測定する光源装置を、図面の
〔図１〕に示す。 ・光源装置は、メタクリル樹脂導光体を縦１００mm、横
１００ないし２４０mmに切断し、周方向の４つの端面を
研削機（朝日メガロ社製プラビューティー１０００）に
より研削した。二面のうち片面に反射板（反射率９０
％）を密着させ、これを裏面とする。研削した端面のう
ち、縦１００mm長の端面の一つに光源として直径４mm、
長さ２０２mm、１．４７Ｗ、３．５mAの冷陰極管を密着
させ、残りの三端面は白色のメタクリル樹脂板で覆っ
た。 ・測定点は、出光面において光入射端面から他端面に向
かって２０mmの間隔とその垂直方向に４等分線との交点
とした。 ・輝度の測定は出光面から２１５mm隔れた所で、輝度計
ミノルタ社製ＬＳ１１０型を用いた。測定された輝度
の平均値を算術平均で求めた。また、輝度の最大値と最
低値とから輝度ムラとして、平均輝度±１０％以下を
○、平均輝度±１０％を越えるものを×で表わした。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A light source device for measuring luminance in an embodiment is shown in FIG. 1 of the drawings. -For the light source device, the methacrylic resin light guide was cut into a length of 100 mm and a width of 100 to 240 mm, and four end faces in the circumferential direction were ground by a grinder (Plastic Beauty 1000 manufactured by Asahi Megalo Co., Ltd.). A reflector (reflectance 90
%), And this is the back side. Among the ground end faces, one of the 100 mm long end faces has a diameter of 4 mm as a light source,
A cold-cathode tube having a length of 202 mm, 1.47 W, and 3.5 mA was brought into close contact, and the remaining three end faces were covered with a white methacrylic resin plate. The measurement point was the intersection of a 20 mm interval from the light incident end face to the other end face on the light emitting surface and the quadrant in the vertical direction. -Brightness was measured at a location 215 mm away from the light exit surface using a luminance meter LS110 manufactured by Minolta. The average value of the measured brightness was calculated by arithmetic mean. In addition, from the maximum value and the minimum value of the brightness, the brightness unevenness is represented by O when the average brightness is ± 10% or less, and by X when the brightness exceeds the average brightness ± 10%.
【００２１】実施例１〜６、比較例１〜３ メタクリル酸メチル共重合体ペレット（スミペックスＬ
Ｇ、住友化学社製 屈折率１．４９）１００重量部に、
架橋ポリスチレン微粒子（住友化学工業（株）社製ファ
インパール 屈折率１．５９）を表１に示した含有量と
なる量を、スーパーミキサー（川田製作所社製）で混合
した後、押し出し機（スクリュー径４０mm、一軸、田辺
プラスチック社製）で混練造粒し、架橋ポリスチレン微
粒子入り樹脂ペレットとした。このペレットを射出成形
により厚み５mm、縦長さ１００mmの樹脂板とした。該樹
脂板を表１に示す横長さの導光体として光源装置を組
み、輝度評価した。結果を表１に示す。Examples 1 to 6 and Comparative Examples 1 to 3 Methyl methacrylate copolymer pellets (SUMIPEX L
G, manufactured by Sumitomo Chemical Co., Ltd. Refractive index 1.49) 100 parts by weight,
Crosslinked polystyrene fine particles (Sumitomo Chemical Co., Ltd., Fine Pearl, refractive index: 1.59) were mixed in the amounts shown in Table 1 with a super mixer (Kawata Manufacturing Co., Ltd.) and then an extruder (screw). Kneaded and granulated with a diameter of 40 mm, uniaxial, manufactured by Tanabe Plastic Co., Ltd. to obtain resin pellets containing crosslinked polystyrene fine particles. The pellets were injection molded into a resin plate having a thickness of 5 mm and a vertical length of 100 mm. A light source device was assembled using the resin plate as a laterally long light guide shown in Table 1, and luminance was evaluated. The results are shown in Table 1.
【００２２】実施例７〜１０、比較例４〜６ 実施例１における架橋ポリスチレン微粒子に代えて、表
１に示す量のシリコン樹脂ビーズ（東レ社製トスパール
屈折率１．４３）とし、厚みを３mmとした以外は、実
施例１と同様にして、樹脂板を得た。該メタクリル樹脂
板を導光体として光源装置を組み、輝度評価した。結果
を表１に示す。Examples 7 to 10 and Comparative Examples 4 to 6 Instead of the crosslinked polystyrene fine particles in Example 1, silicon resin beads in the amount shown in Table 1 (Tospar's Tospearl refractive index 1.43) were used, and the thickness was 3 mm. A resin plate was obtained in the same manner as in Example 1 except that A light source device was assembled using the methacrylic resin plate as a light guide, and luminance was evaluated. The results are shown in Table 1.
【００２３】[0023]
【表１】 [Table 1]
【図１】本発明の光源装置の一例の全体図である。FIG. 1 is an overall view of an example of a light source device of the present invention.
【図２】〔図１〕のＡ−Ａ線断面図である。FIG. 2 is a sectional view taken along line AA of FIG.
【符号の説明】 １は、原光源ランプを示す。 ２は、外枠を示す。 ３は、反射板を示す。 ４は、導光体を示す。[Explanation of Codes] Reference numeral 1 indicates an original light source lamp. 2 shows an outer frame. Reference numeral 3 represents a reflector. Reference numeral 4 denotes a light guide.
Claims (1)
て、面状に出射発光する光源装置において、該導光体
が、屈折率差が０．０２〜０．２、平均粒径が０．１〜
５０μｍの光拡散微粒子を、〔数１〕式で表わされる量
（Ｖ）、均一に分散した透明性樹脂により形成されてい
ることを特徴とする光源装置。 【数１】 ０．５X/100 ／１００≦Ｖ≦（５Ｔ＋５０）／３Ｘ・・・（１） （式中、Ｖは光拡散微粒子の添加量（％）、Ｔは導光体
の光入射側面の厚み（mm）、Ｘは導光体の光入射側面か
ら出光面最遠部までの距離（mm）である。）1. A light source device which emits light from a light source into a side surface of a light guide body and emits and emits the light in a plane shape, wherein the light guide body has a difference in refractive index of 0.02 to 0.2 and an average value. Particle size is 0.1
A light source device comprising a transparent resin in which 50 μm of light diffusing fine particles are uniformly dispersed in an amount (V) represented by the formula [1]. ## EQU1 ## 0.5 X / 100 / 100≤V≤ (5T + 50) / 3X (1) (where, V is the amount of the light diffusing fine particles added (%), and T is the light incident on the light guide. The thickness of the side surface (mm), X is the distance (mm) from the light incident side surface of the light guide to the farthest light emitting surface.)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5109171A JPH06324215A (en) | 1993-05-11 | 1993-05-11 | Light source device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5109171A JPH06324215A (en) | 1993-05-11 | 1993-05-11 | Light source device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06324215A true JPH06324215A (en) | 1994-11-25 |
Family
ID=14503464
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5109171A Pending JPH06324215A (en) | 1993-05-11 | 1993-05-11 | Light source device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06324215A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014044889A (en) * | 2012-08-28 | 2014-03-13 | Kisco Ltd | Light guide plate |
| JP2017122837A (en) * | 2016-01-07 | 2017-07-13 | 小池 康博 | Light diffusion body and surface light source device |
| JP2020033435A (en) * | 2018-08-29 | 2020-03-05 | 三菱エンジニアリングプラスチックス株式会社 | Polycarbonate resin composition and molded body |
-
1993
- 1993-05-11 JP JP5109171A patent/JPH06324215A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014044889A (en) * | 2012-08-28 | 2014-03-13 | Kisco Ltd | Light guide plate |
| JP2017122837A (en) * | 2016-01-07 | 2017-07-13 | 小池 康博 | Light diffusion body and surface light source device |
| JP2020033435A (en) * | 2018-08-29 | 2020-03-05 | 三菱エンジニアリングプラスチックス株式会社 | Polycarbonate resin composition and molded body |
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