JPH08106011A - Light transmission plate, transfer sheet for its light irregular reflection part and formation of this light irregular reflection part - Google Patents
Light transmission plate, transfer sheet for its light irregular reflection part and formation of this light irregular reflection partInfo
- Publication number
- JPH08106011A JPH08106011A JP6264549A JP26454994A JPH08106011A JP H08106011 A JPH08106011 A JP H08106011A JP 6264549 A JP6264549 A JP 6264549A JP 26454994 A JP26454994 A JP 26454994A JP H08106011 A JPH08106011 A JP H08106011A
- Authority
- JP
- Japan
- Prior art keywords
- light
- guide plate
- light guide
- reflection
- adhesive
- 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、液晶用バックライト、
広告等の看板用バックライト、照明器具等に使用される
導光板、その光乱反射部用転写シート及びその光乱反射
部の形成方法に関する。The present invention relates to a liquid crystal backlight,
The present invention relates to a backlight for signboards such as advertisements, a light guide plate used for lighting equipment, a transfer sheet for a diffuse reflection part thereof, and a method for forming the diffuse reflection part.
【０００２】[0002]
【従来の技術】液晶用バックライト等の導光板には、通
常、アクリル、ポリスチレン、ポリカーボネイト、塩化
ビニール、メタクリル樹脂等の透明樹脂板が使用され
る。図２２に示すように、導光板３５の裏面３５Ｂに
は、一般に、スクリーン印刷により、光乱反射部３６が
ドット状グラデーションパターンで形成される。この場
合、印刷用インキには、通常、白色インキが使用され、
該インキは、酸化チタンやシリカ等の微粒子と、バイン
ダーとされるアクリル樹脂等の樹脂成分と、ケトン系溶
剤等の有機溶剤を含有し、光乱反射部３６は、上記微粒
子３７と、樹脂成分３８等から構成される。上記導光板
３５には、通常、その側端面から光を入射させ、光乱反
射部３６で乱反射させて、導光板３５の表面から光を放
射させる。2. Description of the Related Art A transparent resin plate made of acrylic, polystyrene, polycarbonate, vinyl chloride, methacrylic resin or the like is usually used for a light guide plate for a liquid crystal backlight or the like. As shown in FIG. 22, on the back surface 35 </ b> B of the light guide plate 35, the light diffuse reflection portion 36 is generally formed in a dot-shaped gradation pattern by screen printing. In this case, white ink is usually used for printing ink,
The ink contains fine particles such as titanium oxide and silica, a resin component such as an acrylic resin serving as a binder, and an organic solvent such as a ketone solvent, and the light diffuse reflection portion 36 includes the fine particles 37 and the resin component 38. Etc. Light is normally incident on the light guide plate 35 from the side end face thereof, diffused and reflected by the light diffuser 36, and emitted from the surface of the light guide plate 35.
【０００３】[0003]
【発明が解決しようとする課題】ところで、上記印刷時
には、温度、湿度等の各種印刷条件により、導光板３５
へのインキの乗り具合のばらつきが生じ易いと共に、印
刷毎のばらつきも多いため、品質的に問題が多いと共
に、印刷不良も発生し易く、生産性が悪いという問題が
あった。又、導光板３５に一度印刷すると、その印刷部
分の樹脂がインキの有機溶剤で侵されて、膨潤し、イン
キを除去しても、導光板３５に跡が残るため、上記印刷
不良の導光板３５を再利用できず、その分、生産コスト
が高くつくという問題もあった。By the way, at the time of the above printing, the light guide plate 35 is changed depending on various printing conditions such as temperature and humidity.
There is a problem in that there are many problems in terms of quality as well as inferior printing due to the fact that there is a large variation in the degree of ink applied to the ink and there is also a large variation in each printing. Further, once the light guide plate 35 is printed, the resin in the printed part is attacked by the organic solvent of the ink and swells, and even if the ink is removed, traces remain on the light guide plate 35, and thus the light guide plate with the above printing defect There is also a problem that the 35 cannot be reused, and the production cost becomes higher accordingly.
【０００４】更に、光乱反射部３６は微粒子３７を有す
るため、導光板３５に密着する部分が比較的少ない。そ
のため、乱反射時に、光が外部に逃げ易く、大きな反射
ロスを生じるため、導光板３５の発光効率が低く、その
輝度が低いという問題があった。又、新しい導光板３５
の開発時には、種々のパターンの光乱反射部３６を印刷
する必要があるが、この場合も、一度印刷された導光板
３５は再利用できないため、開発コストも高くつくとい
う問題があった。又、上記開発のための印刷時には、上
記のように、各種印刷条件が関係すると共に、印刷不良
も発生し易いことから、開発に長時間掛かるという問題
もあった。Further, since the diffused light reflection portion 36 has the fine particles 37, the portion closely contacting the light guide plate 35 is relatively small. Therefore, at the time of irregular reflection, light easily escapes to the outside, and a large reflection loss occurs, so that there is a problem in that the light emission efficiency of the light guide plate 35 is low and the brightness thereof is low. Also, a new light guide plate 35
At the time of development, it is necessary to print various patterns of the diffused reflection parts 36, but in this case as well, the light guide plate 35 once printed cannot be reused, so there is a problem that the development cost is high. Further, at the time of printing for the development described above, various printing conditions are involved as described above, and printing defects are likely to occur. Therefore, there is a problem that the development takes a long time.
【０００５】本発明は、上記問題を解決できる導光板、
その光乱反射部用転写シート及びその光乱反射部の形成
方法を提供することを目的とする。The present invention is a light guide plate capable of solving the above problems,
An object of the present invention is to provide a transfer sheet for a diffuse reflection part and a method for forming the diffuse reflection part.
【０００６】[0006]
【課題を解決するための手段】上記目的を達成するため
に、本発明の導光板の特徴とするところは、裏面に光乱
反射部が所定のパターンで形成された導光板において、
光乱反射部が、・ 導光板に接着、積層された粘着剤と
反射フィルムを有する点にある。尚、粘着剤が白色とさ
れることもある。又、本発明の導光板の光乱反射部用転
写シートの特徴とするところは、剥離シートと、剥離シ
ート上に備えられた反射フィルムと、反射フィルム上に
所定のパターンで配設された粘着剤を有する点にある。
更に、本発明の導光板の光乱反射部の形成方法の特徴と
するところは、転写シートの粘着剤側を導光板の裏面に
貼付けた後、転写シートの剥離シートを剥離させて、転
写シートの反射フィルムにおける、粘着剤が配設された
部分のみを、粘着剤と共に、導光板の裏面に転写する点
にある。In order to achieve the above object, the light guide plate of the present invention is characterized in that a light diffuser reflection portion is formed on the back surface in a predetermined pattern.
The diffused reflection part is that it has a pressure sensitive adhesive and a reflective film that are adhered and laminated to the light guide plate. The adhesive may be white. Further, the transfer sheet for the diffused reflection part of the light guide plate of the present invention is characterized in that a release sheet, a reflection film provided on the release sheet, and an adhesive provided in a predetermined pattern on the reflection film. Is in the point of having.
Further, the feature of the method for forming the diffused reflection portion of the light guide plate of the present invention is that after the adhesive side of the transfer sheet is attached to the back surface of the light guide plate, the release sheet of the transfer sheet is released to remove the transfer sheet. Only the portion of the reflective film where the adhesive is provided is transferred to the back surface of the light guide plate together with the adhesive.
【０００７】[0007]
【作用】光源からの光は導光板内部に入射されて、全反
射を繰り返しながら、進行すると共に、この進行に伴
い、光の一部は、光乱反射部に到達する。到達した光は
粘着剤で乱反射して、直接、又は、粘着剤で乱反射した
後、反射フィルムで反射して、間接的に、導光板の表面
に導かれる。導かれた光の内、導光板と空気との界面で
の臨界角以下で、導かれた光は、導光板の表面から外部
に放射される。The light from the light source is incident on the inside of the light guide plate and proceeds while repeating the total reflection, and along with this progress, a part of the light reaches the diffused reflection portion. The arrived light is diffusely reflected by the adhesive and directly, or is diffusely reflected by the adhesive and then reflected by the reflective film and is indirectly guided to the surface of the light guide plate. Of the guided light, the guided light is emitted to the outside from the surface of the light guide plate at a critical angle or less at the interface between the light guide plate and air.
【０００８】[0008]
〔導光板装置の構成〕以下、本発明をエッジ型導光板装
置に適用した第１実施例を図１〜図６の図面に基づき説
明する。まず、導光板装置について説明すると、図１及
び図２において、導光板装置は、導光板１と、導光板１
の一側方に配設された光源２と、遮光カバー３と、導光
板１の表面側に配設された光拡散板４と、導光板１の裏
面側に配設された光反射板５等から主構成されている。
導光板１は長方形の板状とされて、アクリル、ポリスチ
レン、ポリカーボネイト、塩化ビニール、メタクリル樹
脂等の透明樹脂板、又は、透明ガラス板等から成る。導
光板１の表面１Ａが発光面とされ、又、裏面１Ｂが反射
面とされると共に、裏面１Ｂには、正方形の光乱反射部
７が、入光面である一側端面（光源２）から遠ざかるに
従って、その面積が次第に大きくなるドット状グラデー
ションパターンで形成されている。尚、光乱反射部７が
円形、長方形、線状とされたり、又、入光面からの距離
に関係なく、均一パターンで形成されることもある。[Structure of Light Guide Plate Device] Hereinafter, a first embodiment in which the present invention is applied to an edge type light guide plate device will be described with reference to the drawings of FIGS. First, the light guide plate device will be described. In FIGS. 1 and 2, the light guide plate device includes a light guide plate 1 and a light guide plate 1.
A light source 2 disposed on one side of the light guide plate 3, a light-shielding cover 3, a light diffusion plate 4 disposed on the front surface side of the light guide plate 1, and a light reflection plate 5 disposed on the back surface side of the light guide plate 1. It is mainly composed of etc.
The light guide plate 1 has a rectangular plate shape and is made of a transparent resin plate such as acrylic, polystyrene, polycarbonate, vinyl chloride, methacrylic resin, or a transparent glass plate. The front surface 1A of the light guide plate 1 is used as a light emitting surface and the back surface 1B is used as a reflecting surface, and a square light diffuse reflection portion 7 is provided on the back surface 1B from one end surface (light source 2) which is a light incident surface. It is formed in a dot-like gradation pattern whose area gradually increases as the distance increases. The irregular diffuser 7 may be circular, rectangular or linear, or may be formed in a uniform pattern regardless of the distance from the light incident surface.
【０００９】図３に示すように、光乱反射部７は、導光
板１の裏面１Ｂに接着、積層された粘着剤９と反射フィ
ルム（遮光フィルム）１０から成る。そして、粘着剤９
の全面が導光板１の裏面１Ｂに接着されて、密着すると
共に、粘着剤９における、導光板１とは反対側の面と反
射フィルム１０が全面にわたって接着されて、密着して
いる。粘着剤９は感圧接着剤とも言われるもので、
溶剤・熱等の助けを必要とせず、 指圧等、ごく低い
圧力で他表面に接着し、又、 これを剥ぎ取る場合に
は、被着面に痕跡を残さず、容易に剥ぎ取ることができ
る接着剤である。粘着剤９には、アクリル系、合成ゴム
系、クロロプレンゴム系、ポリウレタン系粘着剤等が使
用されるが、導光板１に接着できる粘着剤であれば、そ
の材質は自由である。粘着剤９は、ベースポリマーと、
粘着付与剤と、軟化剤と、充填剤と、老化防止剤等を含
有する。環境保全、安全衛生、防災の点、即ち、無公害
の点を考慮すると、粘着剤９は無溶剤型粘着剤が好まし
い。無溶剤型粘着剤には、エマルジョン型、オリゴマー
型、ホットメルト型等がある。粘着剤９は透明、半透
明、又は、不透明とされ、又、反射効率を考慮すれば、
白色が好ましいが、その他の色でも良い。粘着剤９の厚
みは、例えば、０．５〜２０μ、好ましくは、０．８〜
１０μである。As shown in FIG. 3, the irregular diffuser 7 comprises a pressure sensitive adhesive 9 and a reflective film (light-shielding film) 10 which are adhered and laminated on the back surface 1B of the light guide plate 1. And the adhesive 9
The entire surface of is adhered to the back surface 1B of the light guide plate 1 and is in close contact, and the surface of the adhesive 9 on the opposite side of the light guide plate 1 and the reflection film 10 are adhered and are in close contact with each other. The adhesive 9 is also called a pressure sensitive adhesive,
It does not require the help of solvent, heat, etc., and can be easily peeled off without leaving a trace on the adherend when it is adhered to another surface with very low pressure such as finger pressure and peeled off. It is an adhesive. As the adhesive 9, an acrylic adhesive, a synthetic rubber adhesive, a chloroprene rubber adhesive, a polyurethane adhesive, or the like is used, but any material can be used as long as it can adhere to the light guide plate 1. The adhesive 9 is a base polymer,
It contains a tackifier, a softening agent, a filler, an antiaging agent and the like. Considering environmental protection, health and safety, and disaster prevention, that is, pollution-free, the pressure-sensitive adhesive 9 is preferably a solvent-free pressure-sensitive adhesive. The solventless type adhesive includes emulsion type, oligomer type, hot melt type and the like. The adhesive 9 is transparent, semi-transparent, or opaque, and considering the reflection efficiency,
White is preferred, but other colors may be used. The pressure-sensitive adhesive 9 has a thickness of, for example, 0.5 to 20 μ, or preferably 0.8 to
It is 10μ.
【００１０】反射フィルム１０には、白色フィルム、銀
蒸着フィルム、銀フィルム等が使用されるが、その材質
等は自由である。白色フィルムには、ポリエチレンテレ
フタレート（ＰＥＴ）に白色顔料を練り込んだもの、又
は、ＰＥＴに白色顔料を塗布したものが使用される。銀
蒸着フィルムには、ＰＥＴに銀を蒸着したものが使用さ
れる。又、銀フィルムは、単に、銀の薄膜のみから成
る。導光板１における、入光面を除く３側端面には、上
記反射フィルム１０と同様の遮光テープ１２（エッジテ
ープ、反射テープ）が貼付けられて、上記３側端面から
の光漏れが防止されている。遮光テープ１２には、白色
フィルム、銀蒸着フィルム、銀フィルム等が使用され
る。遮光テープ１２が銀フィルムの場合には、熱転写に
より、導光板１に備えられる。尚、遮光テープ１２の代
わりに、白色塗装されることもある。A white film, a silver vapor deposition film, a silver film, or the like is used for the reflection film 10, but the material and the like are free. For the white film, polyethylene terephthalate (PET) kneaded with a white pigment, or PET coated with a white pigment is used. As the silver vapor deposition film, PET vapor-deposited with silver is used. Further, the silver film is composed only of a thin film of silver. A light-shielding tape 12 (edge tape, reflection tape) similar to that of the reflection film 10 is attached to the end faces of the light guide plate 1 other than the light incident face on the three sides to prevent light leakage from the end faces on the three sides. There is. As the light shielding tape 12, a white film, a silver vapor deposition film, a silver film, or the like is used. When the light shielding tape 12 is a silver film, it is provided on the light guide plate 1 by thermal transfer. Instead of the light shielding tape 12, white coating may be applied.
【００１１】光源２には、蛍光灯や冷陰極管等の線光源
が使用されるが、ランプ、又は、ＬＥＤ等の点光源を並
べて使用することもある。遮光カバー３は、例えば、ポ
リエチレンフィルムの内面に銀蒸着フィルムを貼付けて
成り、光源２の光が外部に漏れないように、光源２の外
周を覆被している。光拡散板４は、例えば、ポリカーボ
ネイトフィルムから成る。光反射板５は、ＰＥＴ等の白
色フィルムから成る。A linear light source such as a fluorescent lamp or a cold cathode tube is used as the light source 2, but a point light source such as a lamp or an LED may be used side by side. The light-shielding cover 3 is formed, for example, by sticking a silver vapor deposition film on the inner surface of a polyethylene film, and covers the outer periphery of the light source 2 so that the light of the light source 2 does not leak to the outside. The light diffusion plate 4 is made of, for example, a polycarbonate film. The light reflection plate 5 is made of a white film such as PET.
【００１２】〔導光板の光乱反射部用転写シート〕導光
板１に光乱反射部７を形成する場合には、図４〜図６に
示す光乱反射部用転写シート（光乱反射部形成シート）
１４が使用される。転写シート１４は、剥離シート１５
と、剥離シート１５上に備えられた一枚の反射フィルム
１０と、反射フィルム１０上に配設された粘着剤９から
成る。剥離シート１５は、長方形、又は、正方形状とさ
れ、ポリエチレン樹脂等から成るが、その材質は自由で
ある。反射フィルム１０が銀フィルムである場合には、
図５に示すように、剥離シート１５上に直接、蒸着され
る。又、反射フィルム１０が白色フィルムや銀蒸着フィ
ルムである場合には、図６に示すように、剥離シート１
５上に粘着剤１７（接着剤）により接着される場合と、
粘着剤を使用せずに、他の手段で、剥離シート１５に接
着状態とされる場合がある。[Transfer sheet for light diffuse reflection portion of light guide plate] When the light diffuse reflection portion 7 is formed on the light guide plate 1, the transfer sheet for light diffuse reflection portion (light diffuse reflection portion forming sheet) shown in FIGS. 4 to 6 is formed.
14 is used. The transfer sheet 14 is a release sheet 15
And a piece of the reflection film 10 provided on the release sheet 15 and the adhesive 9 provided on the reflection film 10. The release sheet 15 has a rectangular shape or a square shape and is made of polyethylene resin or the like, but the material thereof is arbitrary. When the reflection film 10 is a silver film,
As shown in FIG. 5, vapor deposition is performed directly on the release sheet 15. Further, when the reflection film 10 is a white film or a silver vapor deposition film, as shown in FIG.
In the case where it is adhered onto the surface 5 with the adhesive 17 (adhesive),
In some cases, the adhesive sheet may be adhered to the release sheet 15 by other means without using the adhesive.
【００１３】尚、粘着剤９による接着力は、剥離シート
１５と反射フィルム１０との接着力（固着力）よりも大
とされている。又、剥離シート１５と反射フィルム１０
間に粘着剤１７が使用された場合には、反射フィルム１
０の剥離シート１５からの剥離時に、粘着剤１７が反射
フィルム１０に付かず、剥離シート１５に残留するよう
にされているが、粘着剤１７が反射フィルム１０と共に
剥離シート１５から剥離する場合もある。粘着剤９を反
射フィルム１０上にドット状グラデーションパターンで
配設する方法としては、スクリーン印刷等の印刷による
方法と、下記のようなフォトエッチング処理による方法
がある。フォトエッチング処理による場合には、粘着剤
９が反射フィルム１０上に全面にわたってコーティング
（塗布）された後、粘着剤９の上方に、上記パターンと
対応するマスクが配設され、光、電子線、紫外線がマス
クを通して、粘着剤９に照射されて、焼き付け（感光
（架橋））処理が行われる。次に、洗浄処理されて、反
射フィルム１０上の粘着剤９の内、焼き付け処理した部
分のみが残され、他の部分が除去されて、反射フィルム
１０上に粘着剤９が上記パターンで配設される。The adhesive force of the adhesive 9 is set to be larger than the adhesive force (fixing force) between the release sheet 15 and the reflective film 10. Further, the release sheet 15 and the reflection film 10
When the adhesive 17 is used between the reflective film 1
Although the pressure sensitive adhesive 17 does not adhere to the reflective film 10 and remains on the peelable sheet 15 when peeled from the release sheet 15 of No. 0, the pressure sensitive adhesive 17 may be peeled from the peelable sheet 15 together with the reflective film 10. is there. As a method for disposing the adhesive 9 on the reflective film 10 in a dot-shaped gradation pattern, there are a printing method such as screen printing and a photoetching method described below. In the case of the photo-etching treatment, after the adhesive 9 is coated (applied) over the entire surface of the reflective film 10, a mask corresponding to the above pattern is arranged above the adhesive 9 and the light, electron beam, Ultraviolet rays are radiated to the adhesive 9 through the mask, and a baking (photosensitization (crosslinking)) process is performed. Next, of the adhesive 9 on the reflective film 10 that has been washed, only the baked portion is left, and the other portions are removed, and the adhesive 9 is provided on the reflective film 10 in the above pattern. To be done.
【００１４】〔導光板の光乱反射部の形成方法〕転写シ
ート１４を使用して、導光板１に光乱反射部７を形成す
る場合には、図４に示すように、転写シート１４の粘着
剤側に導光板１を載置し、両者を圧着して、導光板１に
転写シート１４を貼付けた後、導光板１から剥離シート
１５を剥離させる。これにより、転写シート１４の粘着
剤９が導光板１の裏面１Ｂに転写されると共に、反射フ
ィルム１０における、粘着剤９が配設されている部分
（粘着剤９上に位置する部分）のみが、剥離シート１５
から剥離して、粘着剤９と共に転写される。これによっ
て、導光板１の裏面１Ｂに光乱反射部７が上記パターン
で形成される。上記のように、転写シート１４による転
写で、導光板１の裏面１Ｂに光乱反射部７を形成するよ
うにしたので、この形成時に、温度、湿度等により、大
きな影響を受けることがなく、ほぼ一定品質の光乱反射
部７を容易に形成できると共に、光乱反射部７の形成不
良も発生しにくく、生産性が良い。[Method of Forming Light Diffuse Reflecting Portion of Light Guide Plate] When the light diffuser reflecting portion 7 is formed on the light guide plate 1 by using the transfer sheet 14, as shown in FIG. The light guide plate 1 is placed on the side, both are pressure-bonded, the transfer sheet 14 is attached to the light guide plate 1, and then the release sheet 15 is released from the light guide plate 1. As a result, the pressure sensitive adhesive 9 of the transfer sheet 14 is transferred to the back surface 1B of the light guide plate 1, and only the portion of the reflective film 10 where the pressure sensitive adhesive 9 is disposed (the portion located on the pressure sensitive adhesive 9). Release sheet 15
And is transferred together with the adhesive 9. As a result, the diffused reflection portion 7 is formed on the back surface 1B of the light guide plate 1 in the above pattern. As described above, since the light diffused reflection portion 7 is formed on the back surface 1B of the light guide plate 1 by the transfer by the transfer sheet 14, there is almost no influence of temperature, humidity, etc. at the time of this formation, and the light diffused reflection portion 7 is almost not formed. The irregular diffuser 7 having a constant quality can be easily formed, and the irregular diffuser 7 is less likely to be defectively formed, resulting in good productivity.
【００１５】又、光乱反射部７が、導光板１に接着、積
層される粘着剤９と反射フィルム１０から成るので、導
光板１から光乱反射部７を除去しても、導光板１に跡が
残らない。従って、導光板１に光乱反射部７を形成する
際に、形成不良が生じても、光乱反射部７を導光板１か
ら除去することにより、導光板１を再利用でき、導光板
１の生産コストを安価にできる。更に、新しい導光板１
の開発時には、種々のパターンの光乱反射部７を導光板
１に形成して、各種試験を行う必要があるが、この場合
も、光乱反射部７が形成された導光板１を再利用できる
ので、開発コストを安価にできると共に、上記のよう
に、導光板１に光乱反射部７を形成する際に、温度、湿
度等により、大きな影響を受けにくいと共に、光乱反射
部７の形成不良も発生しにくいことから、開発を短時間
でできる。Further, since the diffused light reflection portion 7 is composed of the adhesive 9 and the reflection film 10 which are adhered and laminated on the light guide plate 1, even if the diffused light reflection portion 7 is removed from the light guide plate 1, the light diffuser reflection portion 7 is left on the light guide plate 1. Does not remain. Therefore, when the light diffuser reflection part 7 is formed on the light guide plate 1, even if a formation defect occurs, the light guide plate 1 can be reused by removing the light diffuser reflection part 7 from the light guide plate 1, and the light guide plate 1 can be produced. The cost can be reduced. Furthermore, new light guide plate 1
At the time of development, it is necessary to form various patterns of the diffused light reflection portion 7 on the light guide plate 1 and perform various tests. In this case, however, the light diffused light reflection plate 7 having the diffused light reflection portion 7 can be reused. The development cost can be reduced, and as described above, when the light diffuser reflection portion 7 is formed on the light guide plate 1, the light diffuser reflection portion 7 is hardly affected by temperature, humidity and the like, and the light diffuser reflection portion 7 is not formed well. Because it is difficult to do, development can be done in a short time.
【００１６】〔導光板装置の作用〕上記のように構成し
た実施例によれば、光源２からの光は、導光板１の側端
面から内部に入射される。入射された光は、導光板１と
空気との界面での光学的密度差により、入射角と反射角
が等しい全反射を繰り返しながら、導光板１の反対側の
側端面に向かって進行すると共に、この進行に伴い、光
の一部は、光乱反射部７に到達する。光乱反射部７に到
達した光は、図３に示すように、粘着剤９（表面、裏
面、内部の何れか、又は、これら３者の内、どれか２
者、又は、上記３者）で乱反射して、直接、又は、粘着
剤９で乱反射した後、反射フィルム１０や光反射板５で
反射して（尚、大部分が反射フィルム１０で反射し、光
反射板５での反射は少ない。）、間接的に、導光板１の
表面１Ａに導かれる。尚、粘着剤９で乱反射する理由
は、粘着剤９が多種類の組成物から成り、光学的に、不
均一であるためと考えられる。[Operation of Light Guide Plate Device] According to the embodiment configured as described above, the light from the light source 2 is incident inside from the side end surface of the light guide plate 1. Due to the difference in optical density at the interface between the light guide plate 1 and air, the incident light travels toward the side end face on the opposite side of the light guide plate 1 while repeating total reflection with the same incident angle and reflection angle. Along with this progress, part of the light reaches the diffuse reflection section 7. As shown in FIG. 3, the light arriving at the diffused reflection portion 7 has an adhesive 9 (any one of the front surface, the back surface, and the inside, or any two of these three.
Person, or the above three persons), and directly or after being diffusely reflected by the adhesive agent 9, reflected by the reflection film 10 or the light reflection plate 5 (most of them are reflected by the reflection film 10, The light is not reflected by the light reflection plate 5), and is indirectly guided to the surface 1A of the light guide plate 1. It is considered that the reason why the pressure-sensitive adhesive 9 diffusely reflects is that the pressure-sensitive adhesive 9 is composed of various kinds of compositions and is optically non-uniform.
【００１７】又、粘着剤９は微粒子を含まず、粘着剤９
の全面が導光板１に密着すると共に、反射フィルム１０
が粘着剤９に全面にわたって密着するので、粘着剤９や
反射フィルム１０での反射時に、光が外部に逃げて、大
きな反射ロスを生じることがなく、導光板１の発光効率
を向上できて、その輝度を向上できる。尚、光乱反射部
７を粘着剤９のみから構成して、反射フィルム１０を省
略することも考えられる。しかしながら、このようにす
ると、各光乱反射部７の粘着剤９の厚さが相違する等の
理由で、各光乱反射部７の粘着剤９の全面が光反射板５
と密着せず、各光乱反射部７の粘着剤９と光反射板５間
に隙間が形成されるため、上記隙間から光が外部に逃げ
易く、反射ロスが大きくなるという問題が生じる。とこ
ろで、上記のようにして、導光板１の表面１Ａに導かれ
た光の内、導光板１と空気との界面での臨界角以下で、
導かれた光は、導光板１の表面１Ａから外部に放射され
る。Further, the adhesive 9 does not contain fine particles, and the adhesive 9
The entire surface of the reflective film 10 adheres to the light guide plate 1.
Adheres to the pressure sensitive adhesive 9 over the entire surface, so that when the light is reflected by the pressure sensitive adhesive 9 or the reflection film 10, light does not escape to the outside, a large reflection loss does not occur, and the luminous efficiency of the light guide plate 1 can be improved, The brightness can be improved. It is also conceivable that the diffuse reflection part 7 is composed of only the adhesive 9 and the reflection film 10 is omitted. However, if done in this way, the entire surface of the adhesive 9 of each diffused reflection portion 7 is covered by the light reflection plate 5 because the thickness of the adhesive 9 of each diffused reflection portion 7 is different.
However, since a gap is formed between the pressure sensitive adhesive 9 of each diffused light reflection portion 7 and the light reflection plate 5, the light easily escapes to the outside through the gap, which causes a problem of large reflection loss. By the way, in the light guided to the surface 1A of the light guide plate 1 as described above, at a critical angle or less at the interface between the light guide plate 1 and air,
The guided light is radiated to the outside from the surface 1A of the light guide plate 1.
【００１８】このように、光が導光板１内部を進行する
に従って、光は、漸次、導光板１の表面１Ａから外部に
放射されるので、光が導光板１内部を進行するに従っ
て、その光量が減少する。しかしながら、上記光量の減
少に対応するように、光乱反射部７が、光源２から遠ざ
かるに従って、その面積が次第に大きくなるドット状グ
ラデーションパターンで形成されているので、導光板１
の表面１Ａの各部分から放射される光量は、光源２から
の距離に関係なく、ほぼ一定となる。そして、導光板１
の表面１Ａから放射された光は、光拡散板４で拡散され
て、輝度むらがなくされ、輝度が均一化される。As described above, as the light travels inside the light guide plate 1, the light is gradually radiated to the outside from the surface 1A of the light guide plate 1. Therefore, as the light travels inside the light guide plate 1, the amount of light is increased. Is reduced. However, the light diffuser 7 is formed in a dot-shaped gradation pattern whose area gradually increases as the distance from the light source 2 increases so as to correspond to the decrease in the light amount.
The amount of light radiated from each part of the surface 1A of is constant regardless of the distance from the light source 2. And the light guide plate 1
The light radiated from the surface 1A is diffused by the light diffusing plate 4 to eliminate uneven brightness and uniform brightness.
【００１９】〔本発明の第２実施例〕図７は本発明の第
２実施例を示し、粘着剤９に、酸化チタン、シリカ等の
微粒子（粉末）１８等が混入されて、乱反射がより起こ
り易いようにされている。[Second Embodiment of the Present Invention] FIG. 7 shows a second embodiment of the present invention, in which fine particles (powder) 18 of titanium oxide, silica, etc. are mixed in the adhesive 9 to cause irregular reflection. It is made easy to happen.
【００２０】〔本発明の他の適用例〕尚、上記実施例
は、本発明をエッジ型導光板装置に適用したものである
が、本発明は、光を導光板の裏面からその内部に入射さ
せる直下型導光板装置にも適用可能である。[Other Application Examples of the Present Invention] In the above embodiment, the present invention is applied to the edge-type light guide plate device. It is also applicable to a direct type light guide plate device.
【００２１】〔従来品と本発明の実施例品との比較試
験〕次に、印刷により光乱反射部が形成された従来品
と、本発明の第１実施例を実施した実施例品の比較試験
を行った。導光板は透明アクリル板を使用し、又、光源
は、直径３mm、長さ９．４inの冷陰極管を使用して、導
光板の長辺側に一灯備えた。尚、従来品と実施例品の相
違点は光乱反射部のみである。そして、従来品と実施例
品の導光板において、有効表面（有効発光面）上の９箇
所で、輝度を測定した。図８は従来品の輝度、図９は実
施例品の輝度である。[Comparative Test of Conventional Product and Example Product of the Present Invention] Next, a comparative test of a conventional product in which a diffused reflection portion is formed by printing and an example product of the first embodiment of the present invention. I went. A transparent acrylic plate was used as the light guide plate, a cold cathode tube having a diameter of 3 mm and a length of 9.4 in was used as the light source, and one light was provided on the long side of the light guide plate. The only difference between the conventional product and the embodiment product is the diffused light reflection part. Then, in the light guide plates of the conventional product and the example product, the brightness was measured at nine points on the effective surface (effective light emitting surface). FIG. 8 shows the luminance of the conventional product, and FIG. 9 shows the luminance of the embodiment product.
【００２２】図８及び図９を見れば、従来品の平均輝度
が１５６９cd／m2であるのに対し、実施例品の平均輝度
は１６８９cd／m2で、従来品よりも７．６％向上したこ
とが分かる。又、従来品と実施例品との生産ロット毎の
性能のばらつきを、各７ロットにおいて、調べた。図１
０が従来品の各ロットの平均輝度及び標準偏差σ、図１
１が実施例品の各ロットの平均輝度及び標準偏差σであ
る。図１０及び図１１を見れば、実施例品の各生産ロッ
トの平均輝度の最小値が従来品の各生産ロットの平均輝
度の最大値よりも大であると共に、実施例品の方が従来
品よりも標準偏差σが小さく、生産ロット毎の性能のば
らつきが小さいことが分かる。Referring to FIGS. 8 and 9, the average brightness of the conventional product is 1569 cd / m 2 , whereas the average brightness of the embodiment product is 1689 cd / m 2, which is 7.6% higher than that of the conventional product. I know what I did. In addition, the variation in performance between the conventional product and the example product for each production lot was examined for each of the 7 lots. FIG.
0 is the average brightness and standard deviation σ of each lot of conventional products, and FIG.
1 is the average luminance and standard deviation σ of each lot of the example product. As shown in FIGS. 10 and 11, the minimum value of the average brightness of each production lot of the example product is larger than the maximum value of the average brightness of each production lot of the conventional product, and the example product is the conventional product. It can be seen that the standard deviation σ is smaller than that of the above, and the variation in performance between production lots is small.
【００２３】〔本発明とは別の改良導光板〕図１２及び
図１３は本発明とは別の改良導光板１９を示す。導光板
１９は、射出成形により、２色の材質から成り、入光部
を除く３側端部を構成する遮光部２０と、遮光部２０以
外の部分である本体部２１から成る。遮光部２０には、
遮光性があり且つ反射率の高い白色樹脂（例えば、白色
のポリメタクリル酸メチル（ＰＭＭＡ））等が使用され
ると共に、厚さ１〜３mm程度とされて、導光板１９の入
光面を除く３側端面からの光漏れを防止している。又、
本体部２１は有効発光部とされて、透明樹脂（例えば、
透明ＰＭＭＡ）が使用されている。尚、導光板１９は通
常の直方体形状ではなく、楔型とされて、入光部から反
対側に向かうに従って、その厚さが漸次減少し、上記反
対側の端部の厚さが１mm、又は、それ以下とされてい
る。[Improved Light Guide Plate Different from the Present Invention] FIGS. 12 and 13 show an improved light guide plate 19 different from the present invention. The light guide plate 19 is made of two color materials by injection molding, and includes a light shielding portion 20 that constitutes the three side end portions except the light incident portion, and a main body portion 21 that is a portion other than the light shielding portion 20. The light shield 20 includes
A white resin having a light-shielding property and a high reflectance (for example, white polymethylmethacrylate (PMMA)) is used, and the thickness is set to about 1 to 3 mm to exclude the light-entering surface of the light guide plate 19. Light leakage from the end surface on the 3 side is prevented. or,
The body portion 21 is an effective light emitting portion and is made of a transparent resin (for example,
Transparent PMMA) is used. The light guide plate 19 is not a normal rectangular parallelepiped shape but a wedge shape, and the thickness thereof gradually decreases toward the opposite side from the light incident portion, and the thickness of the opposite end portion is 1 mm, or , And less.
【００２４】上記導光板１９を製造する場合には、下記
の射出成形機が使用される。即ち、図１４〜図１６に示
すように、回転軸２３にロータリテーブル２４が備えら
れて、ロータリテーブル２４に一対（又は、複数）の共
通下金型２５が配設されている。又、各共通下金型２５
の上方に、共通下金型２５と共に遮光部用キャビティ２
６を構成する一次上金型２７と、共通下金型２５と共に
導光板用キャビティ２８を構成する二次上金型２９とが
昇降自在に備えられている。上記射出成形機を使用し
て、導光板１９を製造する場合には、まず、図１４に示
すように、共通下金型２５に対して、各上金型２７，２
９を型締めし、遮光部用キャビティ２６に遮光部用樹脂
（一次樹脂）を射出して、遮光部２０を成形する。When manufacturing the light guide plate 19, the following injection molding machine is used. That is, as shown in FIGS. 14 to 16, the rotary shaft 23 is provided with the rotary table 24, and the rotary table 24 is provided with a pair (or a plurality) of common lower molds 25. Also, each common lower mold 25
Above the common lower mold 25 and the cavity 2 for the light shielding part.
A primary upper mold 27 that constitutes 6 and a secondary upper mold 29 that constitutes a light guide plate cavity 28 together with the common lower mold 25 are provided so as to be movable up and down. When the light guide plate 19 is manufactured using the above injection molding machine, first, as shown in FIG.
The mold 9 is clamped, and the light-shielding resin (primary resin) is injected into the light-shielding cavity 26 to mold the light-shielding portion 20.
【００２５】次に、共通下金型２５と各上金型２７，２
９を型開きした後、ロータリテーブル２４を回転させ
て、遮光部２０が載置された共通下金型２５を、二次上
金型２９の下方に配置する。しかる後、図１５に示すよ
うに、共通下金型２５に対して、各上金型２７，２９を
型締めして、導光板用キャビティ２８に本体部用樹脂
（二次樹脂）を射出し、本体部２１を成形して、遮光部
２０と本体部２１から成る導光板１９を製造すると共
に、遮光部用キャビティ２６にも遮光部用樹脂を射出し
て、遮光部２０を成形する。次に、図１６に示すよう
に、共通下金型２５と二次上金型２９を型開きして、導
光板１９を取り出し、上記作業を繰り返す。Next, the common lower mold 25 and each upper mold 27, 2
After the mold 9 is opened, the rotary table 24 is rotated, and the common lower mold 25 on which the light shielding unit 20 is placed is arranged below the secondary upper mold 29. Then, as shown in FIG. 15, the upper molds 27 and 29 are clamped to the common lower mold 25, and the resin for the main body (secondary resin) is injected into the cavity 28 for the light guide plate. The main body 21 is molded to manufacture the light guide plate 19 including the light shield 20 and the main body 21, and the light shield resin is injected into the light shield cavity 26 to form the light shield 20. Next, as shown in FIG. 16, the common lower mold 25 and the secondary upper mold 29 are opened, the light guide plate 19 is taken out, and the above operation is repeated.
【００２６】上記によれば、導光板１９の側端面に遮光
テープを貼付けたり、熱転写により銀フィルムを備えた
り、あるいは、塗装を行う必要がなく、生産性を向上で
きると共に、導光板１９が楔型等の異型の場合でも、容
易に対応できる。又、導光板１９の側端面に凹凸がある
等、複雑な形状の場合でも、遮光テープや銀フィルムの
剥離の問題がない。更に、遮光部２０を熱転写や塗装で
形成した場合には、温度変化による樹脂の伸縮に対応で
きず、割れ（クラック）が生じ、光漏れの原因となる
が、この問題も解消できる。このように、遮光部２０に
よる遮光性が向上し、輝度を向上できると共に、遮光テ
ープの接着剤や、剥離した銀フィルム、塗料等の異物が
導光板装置に混入する惧れもない。又、遮光部２０と本
体部２１が同一材質の樹脂である場合には、遮光部２０
と本体部２１の接合状態をかなり良いものとできる。According to the above, it is not necessary to attach a light-shielding tape to the side end surface of the light guide plate 19, to provide a silver film by thermal transfer, or to perform painting, thereby improving the productivity and making the light guide plate 19 wedge-shaped. Even in the case of irregular shapes such as molds, it is possible to easily deal with them. Further, even if the light guide plate 19 has a complicated shape such as a side end surface having irregularities, there is no problem of peeling the light shielding tape or the silver film. Furthermore, when the light-shielding portion 20 is formed by thermal transfer or painting, expansion and contraction of the resin due to temperature change cannot be dealt with and cracks occur, which causes light leakage, but this problem can also be solved. As described above, the light-shielding property of the light-shielding portion 20 is improved, the brightness can be improved, and there is no fear that the adhesive agent of the light-shielding tape, the peeled silver film, the foreign matter such as the paint, and the like are mixed in the light guide plate device. If the light blocking portion 20 and the body portion 21 are made of the same resin material, the light blocking portion 20
The joined state of the main body portion 21 and the main body portion 21 can be considerably improved.
【００２７】〔従来品と改良導光板の比較試験〕次に、
導光板の３辺に白色ＰＥＴテープを貼付けた従来品と、
入光部を除く３側端部を白色ＰＭＭＡ（厚さ３mm）で成
形した改良導光板の比較試験を行った。光源は上記試験
と略同様であるが、２．５Ｗで、同一発光パターンとし
た。そして、従来品と改良導光板の輝度を上記試験と同
様に測定した。図１７は従来品の輝度、図１８は改良導
光板の輝度である。図１７及び図１８を見れば、従来品
の平均輝度が１３７３cd／m2、均斉度（最小輝度／最大
輝度）＝０．８２であるのに対し、改良導光板の平均輝
度が１４６０cd／m2、均斉度＝０．８６で、改良導光板
は従来品よりも、平均輝度で、６．３％向上すると共
に、均斉度（輝度ばらつき）も向上したことが分かる。[Comparative Test of Conventional Product and Improved Light Guide Plate] Next,
A conventional product with white PET tape attached to three sides of the light guide plate,
A comparative test was carried out on an improved light guide plate in which the end portions on three sides excluding the light incident portion were molded with white PMMA (thickness 3 mm). The light source was almost the same as in the above test, but 2.5 W and the same light emission pattern was used. Then, the luminances of the conventional product and the improved light guide plate were measured in the same manner as in the above test. FIG. 17 shows the brightness of the conventional product, and FIG. 18 shows the brightness of the improved light guide plate. 17 and 18, the average brightness of the conventional product is 1373 cd / m 2 and the uniformity (minimum brightness / maximum brightness) = 0.82, while the average brightness of the improved light guide plate is 1460 cd / m 2. It is understood that, when the uniformity is 0.86, the improved light guide plate has improved the average brightness by 6.3% and the uniformity (variation in brightness) more than the conventional product.
【００２８】〔本発明とは別の他の改良導光板〕図１９
はインサート成形により、改良導光板を製造するための
金型等を示し、遮光部２０はシート状、又は、プレート
状とされて、白色等の反射率の高い色の金属、樹脂等が
使用され、例えば、アルミニューム及び銀を蒸着させた
金属や樹脂、又は、白色塗装した金属や樹脂が使用され
る。インサート成形時には、遮光部２０を、発光面（有
効発光部）における、入光面以外を囲むように、金型３
１内に位置決めし、型締めにより、固定した後、キャビ
ティ３２内にアクリル樹脂等の透明樹脂を加圧注入する
ことにより、遮光部２０と本体部を一体成形させる。[Another Improved Light Guide Plate Different from the Present Invention] FIG.
Indicates a mold or the like for manufacturing an improved light guide plate by insert molding, and the light-shielding portion 20 is formed into a sheet shape or a plate shape, and metal, resin, or the like of a color with high reflectance such as white is used. For example, a metal or resin vapor-deposited of aluminum and silver, or a metal or resin white-painted is used. At the time of insert molding, the light-shielding portion 20 surrounds the light-emitting surface (effective light-emitting portion) other than the light-entering surface so that the mold 3 is formed.
After positioning in 1 and fixing by mold clamping, transparent resin such as acrylic resin is pressure-injected into the cavity 32 to integrally mold the light shielding portion 20 and the main body portion.
【００２９】〔従来品と他の改良導光板の比較試験〕次
に、導光板の３辺に白色ＰＥＴテープを貼付けた従来品
と、インサート成形により遮光部を成形した改良導光板
の比較試験を行った。光源は上記試験と略同様である
が、３．４Ｗとされている。そして、従来品と改良導光
板の輝度を上記試験と同様に測定した。図２０は従来品
の輝度、図２１は改良導光板の輝度である。図２０及び
図２１を見れば、従来品の平均輝度が１５８６cd／m2、
均斉度＝０．７２であるのに対し、改良導光板の平均輝
度が１６３５cd／m2、均斉度＝０．８０で、改良導光板
は従来品よりも、平均輝度で、３％向上すると共に、均
斉度（輝度ばらつき）も向上したことが分かる。特に、
遮光性の向上により、導光板の入光部とは反対側の入光
対面部（斜線部）の輝度が向上している。[Comparative Test of Conventional Product and Other Improved Light Guide Plates] Next, a comparative test of a conventional product in which white PET tape is pasted on three sides of the light guide plate and an improved light guide plate in which a light shielding part is formed by insert molding. went. The light source is similar to the above test, but is set to 3.4W. Then, the luminances of the conventional product and the improved light guide plate were measured in the same manner as in the above test. FIG. 20 shows the brightness of the conventional product, and FIG. 21 shows the brightness of the improved light guide plate. 20 and 21, the average brightness of the conventional product is 1586 cd / m 2 ,
While the uniformity is 0.72, the average brightness of the improved light guide plate is 1635 cd / m 2 , and the uniformity is 0.80. The improved light guide plate has an average brightness of 3% higher than the conventional product. It can be seen that the uniformity (luminance variation) is also improved. In particular,
Due to the improvement of the light-shielding property, the brightness of the light incident facing surface (hatched portion) on the side opposite to the light incident portion of the light guide plate is improved.
【００３０】[0030]
【発明の効果】以上詳述したように、本発明によれば、
ほぼ一定品質の光乱反射部を容易に形成できると共に、
光乱反射部の形成不良も発生しにくく、生産性が良い。
又、導光板に光乱反射部を形成する際に、形成不良が生
じても、光乱反射部を導光板から除去することにより、
導光板を再利用でき、導光板の生産コストを安価にでき
る。更に、光乱反射部での反射ロスが少なく、導光板の
発光効率を向上でき、その輝度を向上できる。又、新し
い導光板の開発時にも、開発コストを安価にできると共
に、開発時間も短時間とできる。又、請求項２によれ
ば、粘着剤の反射効率を向上できる。As described in detail above, according to the present invention,
It is possible to easily form a diffused reflection part of almost constant quality,
Forming defects of the diffused reflection portion are unlikely to occur, and the productivity is good.
Further, when the irregular light reflecting portion is formed on the light guide plate, the irregular light reflecting portion is removed from the light guide plate even if a defective formation occurs.
The light guide plate can be reused, and the production cost of the light guide plate can be reduced. Further, there is little reflection loss at the diffused reflection portion, the light emission efficiency of the light guide plate can be improved, and the brightness thereof can be improved. Further, when developing a new light guide plate, the development cost can be reduced and the development time can be shortened. According to claim 2, the reflection efficiency of the pressure-sensitive adhesive can be improved.
【図１】本発明の第１実施例を示す縦側断面図である。FIG. 1 is a vertical cross-sectional view showing a first embodiment of the present invention.
【図２】本発明の第１実施例を示す導光板等の背面図で
ある。FIG. 2 is a rear view of the light guide plate and the like showing the first embodiment of the present invention.
【図３】本発明の第１実施例を示す要部の拡大説明図で
ある。FIG. 3 is an enlarged explanatory view of a main part showing the first embodiment of the present invention.
【図４】本発明の第１実施例を示す転写シートの平面図
である。FIG. 4 is a plan view of a transfer sheet showing a first embodiment of the present invention.
【図５】図４のＡ−Ａ線矢視断面図である。5 is a cross-sectional view taken along the line AA of FIG.
【図６】本発明の第１実施例を示す要部の縦側断面図で
ある。FIG. 6 is a vertical cross-sectional view of the main part showing the first embodiment of the present invention.
【図７】本発明の第２実施例を示す要部の縦側断面図で
ある。FIG. 7 is a vertical cross-sectional view of a main part showing a second embodiment of the present invention.
【図８】従来品の輝度を示す説明図である。FIG. 8 is an explanatory diagram showing the brightness of a conventional product.
【図９】本発明の実施例品の輝度を示す説明図である。FIG. 9 is an explanatory diagram showing the luminance of an example product of the present invention.
【図１０】従来品の生産ロットの平均輝度と標準偏差を
示す表である。FIG. 10 is a table showing average luminance and standard deviation of a production lot of a conventional product.
【図１１】本発明の実施例品の生産ロットの平均輝度と
標準偏差を示す表である。FIG. 11 is a table showing the average luminance and standard deviation of the production lots of the example products of the present invention.
【図１２】改良導光板を示す平面断面図である。FIG. 12 is a plan sectional view showing an improved light guide plate.
【図１３】改良導光板を示す斜視図である。FIG. 13 is a perspective view showing an improved light guide plate.
【図１４】改良導光板の製造方法を説明する説明図であ
る。FIG. 14 is an explanatory diagram illustrating a method for manufacturing the improved light guide plate.
【図１５】改良導光板の製造方法を説明する説明図であ
る。FIG. 15 is an explanatory diagram illustrating a method for manufacturing the improved light guide plate.
【図１６】改良導光板の製造方法を説明する説明図であ
る。FIG. 16 is an explanatory diagram illustrating a method for manufacturing the improved light guide plate.
【図１７】従来品の輝度を示す説明図である。FIG. 17 is an explanatory diagram showing the luminance of a conventional product.
【図１８】改良導光板の輝度を示す説明図である。FIG. 18 is an explanatory diagram showing the brightness of the improved light guide plate.
【図１９】他の改良導光板の金型等を示す平面図であ
る。FIG. 19 is a plan view showing a mold and the like of another improved light guide plate.
【図２０】従来品の輝度を示す説明図である。FIG. 20 is an explanatory diagram showing the brightness of a conventional product.
【図２１】他の改良導光板の輝度を示す説明図である。FIG. 21 is an explanatory diagram showing the luminance of another improved light guide plate.
【図２２】従来例を示す説明図である。FIG. 22 is an explanatory diagram showing a conventional example.
１ 導光板 ２ 光源 ７ 光乱反射部 ９ 粘着剤 １０ 反射フィルム １４ 転写シート １５ 剥離シート 1 Light guide plate 2 Light source 7 Diffuse reflection part 9 Adhesive 10 Reflective film 14 Transfer sheet 15 Release sheet
Claims (4)
成された導光板において、 光乱反射部が、 ・ 導光板に接着、積層された粘着剤と反射フィルムを
有することを特徴とする導光板。1. A light guide plate having a diffused reflection portion formed in a predetermined pattern on a back surface thereof, wherein the diffused reflection portion has: an adhesive and a reflection film, which are adhered to and laminated on the light guide plate. .
光板。2. The light guide plate according to claim 1, wherein the adhesive is white.
有することを特徴とする導光板の光乱反射部用転写シー
ト。3. A transfer sheet for a diffused reflection part of a light guide plate, comprising: a release sheet, a reflection film provided on the release sheet, and an adhesive agent arranged on the reflection film in a predetermined pattern. .
導光板の裏面に貼付けた後、 転写シートの剥離シートを剥離させて、 転写シートの反射フィルムにおける、粘着剤が配設され
た部分のみを、粘着剤と共に、導光板の裏面に転写する
ことを特徴とする導光板の光乱反射部の形成方法。4. The pressure-sensitive adhesive side of the transfer sheet according to claim 3 is attached to the back surface of the light guide plate, and then the release sheet of the transfer sheet is peeled off to dispose the pressure-sensitive adhesive in the reflective film of the transfer sheet. A method for forming a diffused reflection portion of a light guide plate, which comprises transferring only a part to the back surface of the light guide plate together with an adhesive.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6264549A JPH08106011A (en) | 1994-10-03 | 1994-10-03 | Light transmission plate, transfer sheet for its light irregular reflection part and formation of this light irregular reflection part |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6264549A JPH08106011A (en) | 1994-10-03 | 1994-10-03 | Light transmission plate, transfer sheet for its light irregular reflection part and formation of this light irregular reflection part |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08106011A true JPH08106011A (en) | 1996-04-23 |
Family
ID=17404818
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6264549A Pending JPH08106011A (en) | 1994-10-03 | 1994-10-03 | Light transmission plate, transfer sheet for its light irregular reflection part and formation of this light irregular reflection part |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08106011A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000329914A (en) * | 1999-05-24 | 2000-11-30 | Nitto Denko Corp | Cohesive diffusion semitransmitting type reflection plate |
| JP2003050393A (en) * | 2001-08-07 | 2003-02-21 | Seiko Epson Corp | Electrooptical device, tape and method for assembling electrooptical device |
| KR100389058B1 (en) * | 2001-07-19 | 2003-06-25 | 오츠타이어 가부시키가이샤 | Back light |
| KR100417255B1 (en) * | 1999-03-25 | 2004-02-05 | 주식회사 엘지화학 | A backlight system for liquid crystal display devices and a method of making the same |
| KR100431358B1 (en) * | 2001-11-29 | 2004-05-14 | 주식회사 테크자인 | Methods for making dispersion pattern on a light guiding panel |
| JP2005284283A (en) * | 2004-03-30 | 2005-10-13 | Chi Mei Optoelectronics Corp | Direct back light module and liquid crystal display device |
| CN100405153C (en) * | 2003-11-29 | 2008-07-23 | 鸿富锦精密工业（深圳）有限公司 | Light conducting plate and backlight module |
| US7688401B2 (en) | 1998-12-29 | 2010-03-30 | Osram Gmbh | Light source element with lateral, oblique light infeed |
| JP2014209465A (en) * | 2013-03-27 | 2014-11-06 | 三京化成工業株式会社 | Surface light source and manufacturing method thereof |
-
1994
- 1994-10-03 JP JP6264549A patent/JPH08106011A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7688401B2 (en) | 1998-12-29 | 2010-03-30 | Osram Gmbh | Light source element with lateral, oblique light infeed |
| US7688400B1 (en) | 1998-12-29 | 2010-03-30 | Osram Gmbh | Light source element with lateral, angular light injection |
| KR100417255B1 (en) * | 1999-03-25 | 2004-02-05 | 주식회사 엘지화학 | A backlight system for liquid crystal display devices and a method of making the same |
| JP2000329914A (en) * | 1999-05-24 | 2000-11-30 | Nitto Denko Corp | Cohesive diffusion semitransmitting type reflection plate |
| KR100389058B1 (en) * | 2001-07-19 | 2003-06-25 | 오츠타이어 가부시키가이샤 | Back light |
| JP2003050393A (en) * | 2001-08-07 | 2003-02-21 | Seiko Epson Corp | Electrooptical device, tape and method for assembling electrooptical device |
| JP4691852B2 (en) * | 2001-08-07 | 2011-06-01 | セイコーエプソン株式会社 | Electro-optical device, tape, and method of assembling electro-optical device |
| KR100431358B1 (en) * | 2001-11-29 | 2004-05-14 | 주식회사 테크자인 | Methods for making dispersion pattern on a light guiding panel |
| CN100405153C (en) * | 2003-11-29 | 2008-07-23 | 鸿富锦精密工业（深圳）有限公司 | Light conducting plate and backlight module |
| JP2005284283A (en) * | 2004-03-30 | 2005-10-13 | Chi Mei Optoelectronics Corp | Direct back light module and liquid crystal display device |
| JP2014209465A (en) * | 2013-03-27 | 2014-11-06 | 三京化成工業株式会社 | Surface light source and manufacturing method thereof |
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