JP3358732B2 - Manufacturing method of light guide plate - Google Patents
Manufacturing method of light guide plateInfo
- Publication number
- JP3358732B2 JP3358732B2 JP2000123037A JP2000123037A JP3358732B2 JP 3358732 B2 JP3358732 B2 JP 3358732B2 JP 2000123037 A JP2000123037 A JP 2000123037A JP 2000123037 A JP2000123037 A JP 2000123037A JP 3358732 B2 JP3358732 B2 JP 3358732B2
- Authority
- JP
- Japan
- Prior art keywords
- product
- light guide
- guide plate
- hoop material
- mold
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Light Guides In General And Applications Therefor (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、透過型又は、半透
過型パネルを背面より照射するバックライト機構を有す
る表示装置の面状光源ユニットを構成する導光板の製造
方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a light guide plate constituting a planar light source unit of a display device having a backlight mechanism for illuminating a transmissive or transflective panel from the back.
【０００２】[0002]
【従来の技術】近年、ラップトップ型又は、ブック型の
ワードプロセッサーやコンピュータ等の表示装置とし
て、薄型でしかも見易いバックライト機構を有する液晶
表示装置が用いられている。 図１は従来及び本発明に
係わる導光板で、図１（ａ）は平面図、図１（ｂ）は図
１（ａ）の正面図である。導光板について説明する。2. Description of the Related Art In recent years, liquid crystal display devices having a thin and easy-to-see backlight mechanism have been used as display devices for laptop or book type word processors and computers. FIG. 1 is a light guide plate according to the related art and the present invention. FIG. 1 (a) is a plan view, and FIG. 1 (b) is a front view of FIG. 1 (a). The light guide plate will be described.
【０００３】図１において、符号６は面状光源ユニット
であり、 導光板１と光源であるＬＥＤ２とで構成され
ている。導光板１は、透明な板状のプラスチック部材等
よりなり、導光板１には光屈折及び光反射する機能を有
する略逆台形形状の穴３がＬＥＤ２の略直上に配設され
ている。該穴３の形状はＬＥＤ２に面する２辺は略斜面
３ａの形状をしている。斜面３ａの焦点から出た光は平
行光線となる。従って、ＬＥＤ２を斜面３ａの焦点に配
置することにより斜面３ａを反射した光を殆ど平行光線
とすることができる。前記導光板１の光の入射部形状４
は略矩形形状又は略半円形状（図１は矩形形状）でその
両サイドの側面に略半円形状の反射部５が形成されてい
る。前記導光板１の一方の広い面を出光面１ｂとし、そ
の出光面１ｂと対向する面にはＬＥＤ２からの光を対向
する上面に反射させるための放射手段として、その表面
に複数の微小なシボ又は複数個の点状ドット等の光拡散
面１ａを形成する。図１（ａ）に示す二点鎖線Ｌ内がシ
ボ形成の範囲を示すものである。更に、前記光拡散面１
ａに接近して図示しない反射板を配設する。尚、上記し
た逆台形形状の穴３以外に、その左右の所望の位置に図
示しない複数個の穴（又は溝）を形成し、自由に光の放
射方向を調整することができる。In FIG. 1, reference numeral 6 denotes a planar light source unit, which comprises a light guide plate 1 and an LED 2 as a light source. The light guide plate 1 is made of a transparent plate-like plastic member or the like, and the light guide plate 1 has a substantially inverted trapezoidal hole 3 having a function of refracting and reflecting light substantially disposed directly above the LED 2. The shape of the hole 3 is such that two sides facing the LED 2 are substantially inclined surfaces 3a. The light emitted from the focal point of the slope 3a becomes a parallel light beam. Therefore, by arranging the LED 2 at the focal point of the slope 3a, the light reflected on the slope 3a can be made almost parallel light. Light incident part shape 4 of the light guide plate 1
Has a substantially rectangular shape or a substantially semicircular shape (rectangular shape in FIG. 1), and a substantially semicircular reflecting portion 5 is formed on both side surfaces thereof. One wide surface of the light guide plate 1 is a light emitting surface 1b, and a surface facing the light emitting surface 1b is a radiating means for reflecting the light from the LED 2 to the upper surface facing the light emitting surface 1b. Alternatively, a light diffusion surface 1a such as a plurality of dot dots is formed. The area within the two-dot chain line L shown in FIG. Further, the light diffusing surface 1
A reflection plate (not shown) is disposed close to a. In addition to the above-described inverted trapezoidal hole 3, a plurality of holes (or grooves) (not shown) are formed at desired positions on the left and right of the hole 3 so that the light emitting direction can be freely adjusted.
【０００４】以上の構成によりその作用について説明す
る。前記ＬＥＤ２から放射する光は導光板１に入り、逆
台形形状の穴３の斜面３ａ及び略半円形状の反射部５で
出射光を屈折・反射し、上面では正反射、下面では正反
射又はシボ又は点状ドット等の光拡散面１ａによる散乱
反射又は透過して下部の図示しない反射板で散乱し、出
光面１ｂより面状方向の光照射量を調節し出光する。Ｌ
ＥＤ２の直上も明るくすることが出来る。最終的には液
晶パネルを透過し輝度ムラのない照明となる。照明する
面内の輝度の均一性を確保するために面内のシボの粗さ
を調整したり点状ドットの形状、密度を場所により変え
たりする。The operation of the above configuration will be described. The light radiated from the LED 2 enters the light guide plate 1 and refracts and reflects the emitted light at the inclined surface 3 a of the inverted trapezoidal hole 3 and the substantially semicircular reflecting portion 5. The light is diffusely reflected or transmitted by the light diffusing surface 1a, such as a grain or a dot, and is scattered by a lower reflecting plate (not shown). L
It is also possible to make the area directly above ED2 bright. Eventually, the light passes through the liquid crystal panel and has no luminance unevenness. In order to ensure the uniformity of the brightness in the plane to be illuminated, the roughness of the grain in the plane is adjusted, and the shape and density of the dot dots are changed depending on the location.
【０００５】上記した導光板の製造方法は、一般的に射
出成形で行っている。従来の構成の射出成形機におい
て、成形樹脂材料として、例えば、ＰＣ（ポリカ）、Ｐ
ＭＭＡ（アクリル）、ＰＳ（ポリスチレン）等の粒子を
成形機のノズルより供給し、加熱溶融した流動樹脂を金
型内に充填・注入した後、冷却及び固化し、ＥＪピンで
成形品及びランナーを突き出して成形する。この状態で
は、製品となる成形品（導光板）に湯道（ゲート）とラ
ンナーとが一体になって成形される。[0005] The above-described method of manufacturing a light guide plate is generally performed by injection molding. In an injection molding machine having a conventional configuration, for example, PC (polycarbonate), P
Particles such as MMA (acrylic) and PS (polystyrene) are supplied from the nozzle of the molding machine, and the molten resin that is heated and melted is filled and poured into a mold, and then cooled and solidified. Extrude and mold. In this state, a runner (gate) and a runner are integrally formed on a molded product (light guide plate) as a product.
【０００６】しかしながら、前述した射出成形による導
光板の製造方法には次のような問題点がある。即ち、製
品の肉厚が例えば、０．６ｍｍ以下に薄くなればなる
程、充填不足やヒケが発生する。また、金型と同一形状
を製品に写し出すのが困難になり光特性不良が発生す
る。更に、ゲートを切断する２次加工の工程が必要にな
る。また、ランナー部を切除するため成形樹脂材料がム
ダになる。また更に、射出成形では多数個取りは成形技
術的に難しく数個程度（例えば、４個乃至８個程度）が
限界と考えられる。However, the above-described method of manufacturing a light guide plate by injection molding has the following problems. That is, as the thickness of the product is reduced to, for example, 0.6 mm or less, insufficient filling or sink occurs. In addition, it is difficult to project the same shape as the mold on the product, and the optical characteristics are poor. Further, a secondary processing step of cutting the gate is required. Further, since the runner portion is cut off, the molding resin material is wasted. Furthermore, in injection molding, multi-cavity is difficult in terms of molding technology, and it is considered that the limit is about several (for example, about 4 to 8).
【０００７】そこで、本出願人は先に出願した特願２０
００−５１０２（出願日、平成１２年１月１３日）「導
光板の製造方法」にて、従来の射出成形機に代わり樹脂
成形機内の金型に配設された製品キャビティ内に予備加
熱した樹脂シートを挿入し、所定時間圧縮成形し、冷却
・固化し、所望の形状の導光板を作成した。図２に基づ
いてその概要を説明する。Accordingly, the present applicant has filed Japanese Patent Application No.
00-5102 (filing date: January 13, 2000) In the "light guide plate manufacturing method", preheating was performed in the product cavity provided in the mold in the resin molding machine instead of the conventional injection molding machine. The resin sheet was inserted, compression-molded for a predetermined time, cooled and solidified to prepare a light guide plate having a desired shape. The outline will be described based on FIG.
【０００８】図２（ａ）は樹脂成形機の金型の要部説明
図、図２（ｂ）は成形品（導光板）の平面図である。樹
脂成形機の金型２４の構造は、符号１０は、ロケートリ
ング、１１は、固定側取付板、１２は、固定側型板、１
３は、可動側型板、１４は、可動側受板、１５は、スペ
ーサブロック、１６は、可動側取付板、１７は、エジェ
クトプレート（上）、１８は、エジェクトプレート
（下）である。２０は成形品（導光板１）を突き出すエ
ジェクト（ＥＪ）ピンである。FIG. 2A is an explanatory view of a main part of a mold of a resin molding machine, and FIG. 2B is a plan view of a molded product (light guide plate). In the structure of the mold 24 of the resin molding machine, reference numeral 10 is a locate ring, 11 is a fixed-side mounting plate, 12 is a fixed-side mold plate, 1
Reference numeral 3 denotes a movable mold plate, 14 denotes a movable receiving plate, 15 denotes a spacer block, 16 denotes a movable mounting plate, 17 denotes an eject plate (upper), and 18 denotes an eject plate (lower). Reference numeral 20 denotes an eject (EJ) pin for projecting the molded product (light guide plate 1).
【０００９】上記した樹脂成形機の金型２４を構成する
固定側型板１２と可動側型板１３とが開いた状態におい
て予備加熱して軟化した樹脂シートを製品用キャビティ
２５内に挿入し所定時間圧縮成形する。その後、冷却・
固化した成形品（導光板１）をＥＪピン２０の作動によ
り製品を突き出し排出することにより、図２（ｂ）に示
す様な完成製品である所望の形状の導光板１を成形する
ことができる。成形品（導光板１）は、金型と同一の形
状に写し出すことができるので２次加工を行う必要はな
い。When the fixed mold plate 12 and the movable mold plate 13 constituting the mold 24 of the above-mentioned resin molding machine are opened, a preheated and softened resin sheet is inserted into the product cavity 25, and is inserted into the product cavity 25. Time compression molding. After that, cooling
The solidified molded product (light guide plate 1) is ejected and ejected by the operation of the EJ pin 20, whereby the light guide plate 1 having a desired shape as a completed product as shown in FIG. 2B can be formed. . Since the molded product (light guide plate 1) can be projected in the same shape as the mold, it is not necessary to perform secondary processing.
【００１０】[0010]
【発明が解決しようとする課題】上記した様に、金型と
同一形状を製品に写し出すのが容易にできるので転写率
は良く、光特性の向上を図ることはできるが、金型内の
キャビティに樹脂シートを１枚づつ挿入しているので生
産性が悪い。そのため製造工程の自動化による安定生産
及び量産化が課題になる。As described above, since the same shape as the mold can be easily projected onto the product, the transfer rate is good and the optical characteristics can be improved. The productivity is poor because the resin sheets are inserted one by one. Therefore, stable production and mass production by the automation of the manufacturing process become problems.
【００１１】本発明は上記従来の課題に鑑みなされたも
のであり、その目的は、製品の薄肉化に対応でき、製造
工程の自動化による安定生産及び量産化が可能で、安価
な導光板の製造方法を提供するものである。SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to manufacture an inexpensive light guide plate that can cope with a reduction in the thickness of a product, that enables stable production and mass production by automating the production process. It provides a method.
【００１２】[0012]
【課題を解決するための手段】上記目的を達成するため
に、本発明における導光板の製造方法は、面状光源ユニ
ットを構成する透明なプラスチック部材よりなる板状の
導光板の製造方法において、前記透明なプラスチック部
材よりなるフープ材を予備加熱装置に供給するフープ材
供給工程と、予備加熱装置で前記フープ材の導光板形成
領域を所定の温度で加熱して軟化させる予備加熱工程
と、前記フープ材の導光板成形領域が軟化された状態で
樹脂成形機に供給された後、所定時間圧縮成形し、冷却
・固化し、成形品が製品ツナギ部でフープ材に連結され
た状態で成形される成形工程と、前記樹脂成形機内から
排出し、抜き型内に供給して製品ツナギ部を切断して単
個の製品に分離するツナギ部切断工程と、製品分離後の
フープ材を巻き取る巻取り工程と、よりなることを特徴
とするものである。In order to achieve the above object, a method of manufacturing a light guide plate according to the present invention is directed to a method of manufacturing a plate-like light guide plate made of a transparent plastic member constituting a planar light source unit. A hoop material supply step of supplying a hoop material made of the transparent plastic member to a preheating device, a preheating step of heating the light guide plate forming region of the hoop material at a predetermined temperature and softening the same with the preheating device, After the light guide plate molding region of the hoop material is supplied to the resin molding machine in a softened state, it is compression molded for a predetermined time, cooled and solidified, and the molded product is molded in a state where the molded product is connected to the hoop material at the product jump part. Molding step, a cutting section for discharging the resin from the resin molding machine, supplying the cutting section to the punching die, and cutting the product section to separate the product into single products, and winding up the hoop material after the product separation. A step taken, is characterized in that the more becomes.
【００１３】また、前記成形工程は、前記樹脂成形機内
の金型に配設された製品キャビティを一つの金型内に複
数列、複数個分配置して所望の形状の導光板を多数個同
時に成形することを特徴とするものである。In the molding step, a plurality of light guide plates of a desired shape may be simultaneously formed by arranging a plurality of product cavities arranged in a mold in the resin molding machine in a plurality of rows in one mold. It is characterized by being molded.
【００１４】[0014]
【発明の実施の形態】以下図面に基づいて本発明の導光
板の製造方法について説明する。図３は、本発明の第１
の実施の形態に係わり、図３（ａ）は導光板の製造工程
を説明する説明図である。図３において（Ａ）はフープ
材供給工程で、透明なプラスチック部材、例えば、Ｐ
Ｃ、ＰＭＭＡ等よりなるフープ材３０の厚みは製品（導
光板１）の厚みより僅かに厚い、例えば、略１ｍｍ程
度、幅は製品の形状とフープ材３０の長手方向の両側に
配設された後述するパイロット孔を考慮して、例えば、
単列で略４５ｍｍ程度、２列で略７５ｍｍ程度であり、
フープ材３０はリール３１に巻かれている。前記フープ
材３０の厚み及び幅寸法は製品の厚み及び形状等により
適宜設定するものである。前記フープ材３０は所定の送
り速度で予備加熱装置に送り出される。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for manufacturing a light guide plate according to the present invention will be described below with reference to the drawings. FIG. 3 shows the first embodiment of the present invention.
FIG. 3A is an explanatory view for explaining a manufacturing process of a light guide plate. In FIG. 3, (A) is a hoop material supply step, in which a transparent plastic member, for example, P
The thickness of the hoop material 30 made of C, PMMA, or the like is slightly thicker than the thickness of the product (light guide plate 1), for example, about 1 mm, and the width is disposed on both sides of the product shape and the hoop material 30 in the longitudinal direction. In consideration of the pilot hole described later, for example,
It is about 45 mm in a single row, about 75 mm in a two row,
The hoop material 30 is wound around a reel 31. The thickness and width dimensions of the hoop material 30 are appropriately set according to the thickness and shape of the product. The hoop material 30 is sent out to a preheating device at a predetermined feeding speed.
【００１５】（Ｂ）は予備加熱工程で、前記フープ材３
０の導光板成形領域を所定の温度に加熱する。加熱手段
とて、例えば、ヒーター３２で加熱温度は樹脂のガラス
転移点領域（固化状態から溶融状態に変化する点）より
若干低い温度で加熱する。ガラス転移点はフープ材３０
の材質がＰＳでは約１６０°Ｃ、ＰＭＭＡでは約１８０
°Ｃ、ＰＣでは約２４０°Ｃより低い温度である。(B) is a preheating step, in which the hoop material 3
The 0 light guide plate forming area is heated to a predetermined temperature. As the heating means, for example, the heater 32 heats the resin at a temperature slightly lower than the glass transition point region (point at which the resin changes from a solidified state to a molten state). Glass transition point is hoop material 30
Is about 160 ° C for PS and about 180 for PMMA
° C, lower than about 240 ° C for PC.
【００１６】（Ｃ）は成形工程で、予備加熱して軟化し
たフープ材３０の導光板形成領域を前述した樹脂成形機
（図２）の金型２４に挿入し、所定時間圧縮成形した
後、冷却・固化する。図４に示す様に、成形された製品
１Ａがツナギ部１Ｂでフープ材３０に連結された状態で
成形される。(C) is a molding step, in which the light guide plate forming region of the hoop material 30 which has been softened by preheating is inserted into the mold 24 of the above-mentioned resin molding machine (FIG. 2), and compression molded for a predetermined time. Cool and solidify. As shown in FIG. 4, the molded product 1A is molded in a state where it is connected to the hoop material 30 by the jumper 1B.
【００１７】図５は、樹脂成形機の型内での成形状態を
示す要部断面図である。前記金型２４の製品用キャビテ
ィ２５内でフープ材３０の導光板領域が圧縮成形され
て、製品１Ａとフープ材３０とは薄いツナギ部１Ｂにて
連結されている。図中、Ａは後述する抜きカスとなる。FIG. 5 is a sectional view of a main part showing a molding state in a mold of the resin molding machine. The light guide plate area of the hoop material 30 is compression-molded in the product cavity 25 of the mold 24, and the product 1A and the hoop material 30 are connected by a thin jumper 1B. In the figure, A is a scrap to be described later.
【００１８】図６は、成形工程後に樹脂成形機から排出
された製品とフープ材の状態を説明する要部断面図であ
る。上記した様に、製品１Ａはツナギ部１Ｂにてフープ
材３０に連結されている。FIG. 6 is a sectional view of an essential part for explaining the state of the product and the hoop material discharged from the resin molding machine after the molding step. As described above, the product 1A is connected to the hoop material 30 at the jumper 1B.
【００１９】図４は、図６の平面図である。フープ材３
０は、前述した様に、長手方向の両側に所定の間隔でパ
イロット孔３０ａが形成されている。パイロット孔３０
ａは、後述する切断工程の際に製品の位置決めとして使
用するもので、一般的には、フープ材作成時に事前に形
成しておくが、フープ材の板厚みによっては型内で抜く
場合もある。パイロット孔３０ａの孔径は、例えば、略
２ｍｍ程度の大きさで、孔位置は強度面から製品外形よ
り、例えば、略５ｍｍ程度離れた位置に配設する。図
中、斜線部は製品１Ａとなる部分である。製品１Ａの外
形部１Ｃ及び製品１Ａ内の逆台形形状の穴３は、成形工
程でフープ材３０とは切り離されている。従って、１個
の製品１Ａが繋がっているツナギ部１Ｂは１個の製品当
たり数箇所（図４では、４箇所）である。FIG. 4 is a plan view of FIG. Hoop material 3
As for 0, the pilot holes 30a are formed at predetermined intervals on both sides in the longitudinal direction as described above. Pilot hole 30
a is used for positioning the product in the cutting step described later, and is generally formed in advance at the time of the hoop material creation, but may be removed in the mold depending on the thickness of the hoop material. . The diameter of the pilot hole 30a is, for example, approximately 2 mm, and the hole position is disposed at a position, for example, approximately 5 mm away from the outer shape of the product from the strength surface. In the figure, the hatched portion is a portion that becomes the product 1A. The outer portion 1C of the product 1A and the inverted trapezoidal hole 3 in the product 1A are separated from the hoop material 30 in the molding process. Therefore, the number of the jumper portions 1B to which one product 1A is connected is several (4 in FIG. 4) per one product.
【００２０】（Ｄ）はツナギ部の切断工程で、前記樹脂
成形機の金型２４内から排出され抜き型３３内に供給さ
れて、製品１Ａとフープ材３０とを連結しているツナギ
部１Ｂを切断して単個の製品に分離する。(D) is a cutting process of the jumper portion. The jumper portion 1B is discharged from the mold 24 of the resin molding machine and supplied to the punching die 33 to connect the product 1A and the hoop material 30. And cut into single products.
【００２１】図７に示す様に、抜き型３３内に組み込ま
れた図示しないガイドピンで前述したフープ材３０に設
けられたパイロット孔３０ａで位置決めし、製品１Ａを
上下型３３Ａ、３３Ｂで押さえた状態でパンチ３４でツ
ナギ部１Ｂを切断する。その際、抜きカスＡを同時に排
出し、図７（ｂ）に示す様に単個の製品１Ａ（導光板
１）に分離される。分離された製品１Ａは図３に示す様
に、製品収納容器３５内に収納される。As shown in FIG. 7, a guide pin (not shown) incorporated in the punching die 33 is used to position the pilot hole 30a provided in the hoop member 30, and the product 1A is pressed by the upper and lower dies 33A and 33B. In the state, the punch part 1B is cut by the punch 34. At this time, the scrap A is simultaneously discharged and separated into a single product 1A (light guide plate 1) as shown in FIG. The separated product 1A is stored in a product storage container 35 as shown in FIG.
【００２２】（Ｅ）はフープ材巻取り工程で、製品を分
離した後のフープ材３０で、巻取り装置のリール３６に
巻き取られる。巻き取られたフープ材３０は再生材とし
て有効活用する。(E) is a hoop material winding step, in which the hoop material 30 after the product is separated is wound on a reel 36 of a winding device. The wound hoop material 30 is effectively used as a recycled material.
【００２３】以上述べた様に、樹脂成形する材料をフー
プ材で連続的に供給して所望の製品（導光板）を成形す
るものである。本実施の形態においては単列で行い、フ
ープ材供給工程（Ａ）→予備加熱工程（Ｂ）→成形工程
（Ｃ）→ツナギ部切断工程（Ｄ）→フープ材巻取り工程
（Ｅ）の１サイクルは導光板の仕様、取り個数等により
異なるが、例えば、略２０秒〜３０秒程度である。As described above, a desired product (light guide plate) is formed by continuously supplying a material for resin molding with a hoop material. In this embodiment, it is performed in a single row, and is one of a hoop material supply step (A) → a preheating step (B) → a forming step (C) → a jump part cutting step (D) → a hoop material winding step (E). The cycle varies depending on the specifications of the light guide plate, the number of the light guide plates, and the like, but is, for example, about 20 seconds to 30 seconds.
【００２４】図８は、本発明の第２の実施の形態に係わ
り、フープ材に成形品を２列配列した場合の樹脂成形工
程後の平面図である。フープ材３０の幅寸法は前述した
様に、２列で例えば、略７５ｍｍ程度である。樹脂成形
機（図２）の金型２４の製品用キャビティ２５が複数個
（２個）配設されており、同時に２個の製品１Ａが製品
ツナギ部１Ｂで連結された状態で成形される。製造工程
は前述した第１の実施の形態と同様であるので説明は省
略する。FIG. 8 is a plan view of the second embodiment of the present invention after a resin molding step in which molded products are arranged in two rows on a hoop material. As described above, the width of the hoop member 30 is two rows, for example, about 75 mm. A plurality of (two) product cavities 25 of the mold 24 of the resin molding machine (FIG. 2) are provided, and two products 1A are simultaneously formed in a state where they are connected by the product jump part 1B. The manufacturing process is the same as that of the first embodiment, and the description is omitted.
【００２５】上記した構成により、１サイクルでの取り
個数が多くなる。上記した第２の実施の形態では樹脂成
形機内の型内のキャビティの数は、２列、２個の場合で
あるが、更に列数と個数を増し、複数列、複数個にする
ことにより更なる量産化が可能となる。With the above configuration, the number of pieces to be taken in one cycle increases. In the above-described second embodiment, the number of cavities in the mold in the resin molding machine is two rows and two cavities. Mass production is possible.
【００２６】[0026]
【発明の効果】以上説明したように、本発明によれば、
従来の射出成形で問題になった薄肉製品の生産が安定的
に行うことができ、光特性不良がなく製品の歩留りが向
上する。フープ材の使用により製品の自動化による安定
生産と、複数列、複数個を同時成形により、更に多数個
生産が容易になり量産化が可能となる。より製品コスト
を低減することができ、製品の薄型化に対応できる導光
板の製造方法を提供することができる。As described above, according to the present invention,
The production of thin-walled products, which has been a problem in conventional injection molding, can be stably performed, and there is no optical property defect, and the product yield is improved. The use of hoop materials enables stable production by automating products, and the simultaneous molding of a plurality of rows and a plurality of pieces makes it easier to produce a large number of pieces and enables mass production. It is possible to provide a method for manufacturing a light guide plate that can further reduce product cost and can cope with a reduction in thickness of a product.
【図１】本発明及び従来に共通な導光板で、図１（ａ）
は平面図、図１（ｂ）は図１（ａ）の正面図である。FIG. 1 is a light guide plate common to the present invention and the conventional one, and FIG.
1 is a plan view, and FIG. 1B is a front view of FIG.
【図２】図２（ａ）は樹脂成形機の金型の構造を示す要
部説明図、図２（ｂ）は成形品（導光板）の平面図であ
る。FIG. 2A is an explanatory view of a main part showing a structure of a mold of a resin molding machine, and FIG. 2B is a plan view of a molded product (light guide plate).
【図３】本発明の第１の実施の形態に係わる導光板の製
造工程を示す説明図である。FIG. 3 is an explanatory view showing a manufacturing process of the light guide plate according to the first embodiment of the present invention.
【図４】図３の樹脂成形後の製品とツナギ部の状態を示
す平面図である。FIG. 4 is a plan view showing the state of the product and the jumper portion after the resin molding of FIG. 3;
【図５】図３の樹脂成形状態を示す説明図である。FIG. 5 is an explanatory view showing a resin molding state of FIG. 3;
【図６】図３の成形工程後に製品とツナギ部の状態を示
す要部断面図である。6 is a cross-sectional view of a main part showing a state of a product and a jumpsuit portion after the forming step of FIG. 3;
【図７】図７（ａ）は図３の切断工程を示す要部断面
図、図７（ｂ）は分離された製品の平面図である。7A is a sectional view of a main part showing a cutting step of FIG. 3, and FIG. 7B is a plan view of a separated product.
【図８】本発明の第２の実施の形態に係わり、樹脂成形
後の製品とツナギ部の状態を示す平面図である。FIG. 8 is a plan view showing a state of a product and a jumpsuit portion after resin molding according to the second embodiment of the present invention.
１ 導光板 １Ａ 製品 １Ｂ ツナギ部 １Ｃ 製品外形部 ２４ 金型 ２５ 製品キャビティ ３０ フープ材 ３０ａ パイロット孔 ３１、３６ リール ３２ ヒーター ３３ 抜き型 ３４ パンチ ３５ 製品収納容器 Ａ 抜きカス （Ａ） フープ材供給工程 （Ｂ） 予備加熱工程 （Ｃ） 成形工程 （Ｄ） ツナギ部切断工程 （Ｅ） フープ材巻取り工程 Reference Signs List 1 light guide plate 1A product 1B jumpsuit 1C product outer shape 24 mold 25 product cavity 30 hoop material 30a pilot hole 31, 36 reel 32 heater 33 punching die 34 punch 35 product storage container A pulling waste (A) hoop material supply process ( B) Pre-heating step (C) Forming step (D) Tsunagi section cutting step (E) Hoop material winding step
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) B29C 43/02 B29C 43/32 - 43/42 G02B 6/00 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. 7 , DB name) B29C 43/02 B29C 43/32-43/42 G02B 6/00
Claims (2)
スチック部材よりなる板状の導光板の製造方法におい
て、前記透明なプラスチック部材よりなるフープ材を予
備加熱装置に供給するフープ材供給工程と、予備加熱装
置で前記フープ材の導光板形成領域を所定の温度で加熱
して軟化させる予備加熱工程と、前記フープ材の導光板
成形領域が軟化された状態で樹脂成形機に供給された
後、所定時間圧縮成形し、冷却・固化し、成形品が製品
ツナギ部でフープ材に連結された状態で成形される成形
工程と、前記樹脂成形機内から排出し、抜き型内に供給
して製品ツナギ部を切断して単個の製品に分離するツナ
ギ部切断工程と、製品分離後のフープ材を巻き取る巻取
り工程と、よりなることを特徴とする導光板の製造方
法。1. A method of manufacturing a plate-shaped light guide plate made of a transparent plastic member constituting a planar light source unit, wherein a hoop material supply step of supplying a hoop material made of the transparent plastic member to a preheating device, A preheating step of heating the light guide plate forming region of the hoop material at a predetermined temperature and softening with a preheating device, and the light guide plate molding region of the hoop material is supplied to the resin molding machine in a softened state, Compression molding for a predetermined time, cooling and solidification, a molding process in which the molded product is molded in a state where the molded product is connected to the hoop material at the product jumping portion, and discharged from the resin molding machine and supplied to the punching die to produce the product jumping 1. A method for manufacturing a light guide plate, comprising: a step of cutting a part of a hoop to cut a part to separate a single product; and a step of winding a hoop material after separating the product.
型に配設された製品キャビティを一つの金型内に複数
列、複数個分配置して所望の形状の導光板を多数個同時
に成形することを特徴とする請求項１記載の導光板の製
造方法。2. The molding step includes arranging a plurality of product cavities arranged in a mold in the resin molding machine in a plurality of rows and a plurality of product cavities in one mold, and simultaneously providing a large number of light guide plates having a desired shape. The method for manufacturing a light guide plate according to claim 1, wherein the light guide plate is formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000123037A JP3358732B2 (en) | 2000-04-24 | 2000-04-24 | Manufacturing method of light guide plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000123037A JP3358732B2 (en) | 2000-04-24 | 2000-04-24 | Manufacturing method of light guide plate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001300954A JP2001300954A (en) | 2001-10-30 |
| JP3358732B2 true JP3358732B2 (en) | 2002-12-24 |
Family
ID=18633429
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000123037A Expired - Fee Related JP3358732B2 (en) | 2000-04-24 | 2000-04-24 | Manufacturing method of light guide plate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3358732B2 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100419469C (en) * | 2002-12-21 | 2008-09-17 | 鸿富锦精密工业（深圳）有限公司 | Light conducting board deformation correcting method |
| WO2004062886A1 (en) * | 2003-01-15 | 2004-07-29 | Scivax Corporation | Device, method, and system for pattern forming |
| JP2006146123A (en) * | 2004-10-21 | 2006-06-08 | Idemitsu Kosan Co Ltd | Reflector for led and method for producing same |
| JPWO2009099219A1 (en) * | 2008-02-07 | 2011-06-02 | ソニー株式会社 | Light guide plate, surface light emitting device, liquid crystal display device, and light guide plate manufacturing method |
| KR101204690B1 (en) | 2011-01-28 | 2012-11-26 | 주식회사동양강철 | Manufacturing method of light guide plate for backlight unit and the same |
| KR101102131B1 (en) * | 2011-07-12 | 2012-01-02 | 레이젠 주식회사 | Device for extrusion molding |
| JP5949465B2 (en) * | 2012-11-05 | 2016-07-06 | オムロン株式会社 | Transfer molding method, mold structure, transfer molding apparatus, and optical member |
| JP5267721B1 (en) * | 2012-11-22 | 2013-08-21 | オムロン株式会社 | Light guide plate manufacturing method, mold structure, transfer molding device, light guide plate, surface light source device, liquid crystal display device, and mobile device |
-
2000
- 2000-04-24 JP JP2000123037A patent/JP3358732B2/en not_active Expired - Fee Related
Also Published As
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|---|---|
| JP2001300954A (en) | 2001-10-30 |
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