JP2015058642A - Light guide plate and metallic mold - Google Patents

Light guide plate and metallic mold Download PDF

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JP2015058642A
JP2015058642A JP2013194342A JP2013194342A JP2015058642A JP 2015058642 A JP2015058642 A JP 2015058642A JP 2013194342 A JP2013194342 A JP 2013194342A JP 2013194342 A JP2013194342 A JP 2013194342A JP 2015058642 A JP2015058642 A JP 2015058642A
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guide plate
light guide
runner
gate
view
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憲 利部
Ken Toshibe
憲 利部
功洋 西峰
Koyo Nishimine
功洋 西峰
喜一 田邉
Kiichi Tanabe
喜一 田邉
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Japan Display Inc
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Japan Display Inc
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Priority to JP2013194342A priority Critical patent/JP2015058642A/en
Priority to CN201420538461.XU priority patent/CN204183819U/en
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  • Light Guides In General And Applications Therefor (AREA)

Abstract

PROBLEM TO BE SOLVED: To achieve suppression of the luminance unevenness of a light guide plate.SOLUTION: A light guide plate 20 of the present invention includes: a runner part 25 extending in a first direction X; a light guide plate forming part 29 of platy shape having a width wider than the runner part in plane view; and a gate part 27 which connects the end 25b on the light guide plate forming part side, of the runner part and the lateral face 29a of the light guide plate forming part with each other, and has a width that becomes wider as it approaches the lateral face in plane view. The shape of the gate part in plane view has: a first side 27a connecting to the end of the runner part and extending in the direction that intersects with the first direction; and a second side 27b whose angle β formed between the first direction is closer to a right-angle than the angle α formed between the first direction by the first side, and connecting to the end 27aon the light guide plate forming part side of the first side.

Description

本発明は導光板及び金型に関する。   The present invention relates to a light guide plate and a mold.

薄型で軽量な表示装置として、バックライトユニットを有する液晶表示装置が開発されている。バックライトユニットは、板状の導光板と、導光板の端面に配置された発光ダイオードと、を有している。   A liquid crystal display device having a backlight unit has been developed as a thin and light display device. The backlight unit includes a plate-shaped light guide plate and a light emitting diode disposed on an end surface of the light guide plate.

このような導光板の製造方法としては、いわゆる射出成形が知られている。例えば特許文献１において、導光板の本体が形成される部分と、その部分に樹脂を注入するための注入口と、を有する金型に樹脂を注入する方法が開示されている。樹脂は外部から圧力をかけて、注入口を介して金型に注入されることにより成形品形成部全体に広がる。その後、硬化した樹脂を金型から取り外すことにより導光板が形成される。   As a method for manufacturing such a light guide plate, so-called injection molding is known. For example, Patent Document 1 discloses a method of injecting resin into a mold having a portion where a main body of a light guide plate is formed and an injection port for injecting resin into the portion. The resin is spread from the outside to the entire molded product forming part by being injected into the mold through the injection port under pressure. Thereafter, the light guide plate is formed by removing the cured resin from the mold.

特開２００９−１９８６７０号公報JP 2009-198670 A

近年の導光板と金型の成形品形成部の大型化に伴い、金型へ樹脂を高速で注入することが必要となるため、注入口と成形品形成部との境界でヒケ（窪み）が発生しやすくなる。また、ヒケ発生を抑えるために注入口を大きくすると、注入口の体積が増加する分、成形品形成部への樹脂の注入の際に高い圧力が必要となる。このため、成形品形成部に成形ムラが発生しやすくなる。これらの結果、導光板の輝度ムラが生じやすくなる。   With the recent increase in size of the light guide plate and the molded product forming part of the mold, it is necessary to inject resin into the mold at a high speed, so there is a sink (dent) at the boundary between the injection port and the molded product forming part. It tends to occur. Further, if the injection port is enlarged in order to suppress the occurrence of sink marks, the pressure of the injection of the resin into the molded product forming portion is required because the volume of the injection port increases. For this reason, it becomes easy to generate | occur | produce a shaping | molding nonuniformity in a molded article formation part. As a result, luminance unevenness of the light guide plate is likely to occur.

本発明は、このような事情に鑑みてなされたものであって、導光板の輝度ムラの抑制を実現することを目的とする。   This invention is made | formed in view of such a situation, Comprising: It aims at implement | achieving suppression of the brightness nonuniformity of a light-guide plate.

本出願において開示される発明のうち、代表的なものの概要を簡単に説明すれば、以下の通りである。 Of the inventions disclosed in the present application, the outline of typical ones will be briefly described as follows.

（１）本発明の導光板は、第１の方向に延在するランナー部と、平面視で前記ランナー部よりも広い幅を有する板状の導光板形成部と、前記ランナー部の前記導光板形成部側の端部と前記導光板形成部の一側面とを接続し、平面視で前記一側面に近づくにつれ、その幅が広くなるゲート部と、を備え、前記ゲート部の平面視形状は、前記ランナー部の前記端部に接続し、前記第１の方向に交差する方向に延びる第１の辺と、前記第１の方向と成す角度が、前記第１の辺が前記第１の方向と成す角度よりも直角に近い方向に延びる、前記第１の辺の前記導光板形成部側の端部に接続する第２の辺と、を、有することを特徴とする。   (1) The light guide plate of the present invention includes a runner portion extending in a first direction, a plate-shaped light guide plate forming portion having a width wider than the runner portion in plan view, and the light guide plate of the runner portion. Connecting the end portion on the forming portion side and one side surface of the light guide plate forming portion, and having a gate portion whose width becomes wider as approaching the one side surface in plan view, and the plan view shape of the gate portion is The first side connected to the end of the runner portion and extending in a direction intersecting the first direction and the angle formed with the first direction are such that the first side is the first direction. And a second side connected to the end of the first side on the light guide plate forming part side, extending in a direction closer to a right angle than the angle formed by the first side.

（２）本発明の導光板は、（１）において、前記導光板形成部の前記一側面に接続する前記ゲート部の側面の幅が、平面視で前記一側面の幅と同じであってもよい。   (2) In the light guide plate of the present invention, in (1), even if the width of the side surface of the gate portion connected to the one side surface of the light guide plate forming portion is the same as the width of the one side surface in plan view. Good.

（３）本発明の金型は、第１の方向に延在する筒状のランナーと、平面視で前記ランナーよりも広い幅を有する、中空の導光板成型部と、前記ランナーの前記導光板成型部側の端部と前記導光板成型部の一側面とを接続し、平面視で前記一側面に近づくにつれ、その幅が広くなる中空のゲートと、を備え、前記ゲートの平面視形状は、前記ランナーの前記端部に接続し、前記第１の方向に交差する方向に延びる第１の辺と、前記第１の方向と成す角度が、前記第１の辺が前記第１の方向と成す角度よりも直角に近い方向に延びる、前記第１の辺の前記導光板成型部側の端部に接続する第２の辺と、を、有することを特徴とする。   (3) The mold of the present invention includes a cylindrical runner extending in a first direction, a hollow light guide plate molding portion having a width wider than the runner in plan view, and the light guide plate of the runner. And connecting the end portion on the molding portion side with one side surface of the light guide plate molding portion, and a hollow gate whose width increases as the side surface approaches the one side surface, and the plan view shape of the gate is The first side connected to the end of the runner and extending in a direction intersecting the first direction, and the angle formed with the first direction is such that the first side is the first direction. And a second side connected to an end portion of the first side on the light guide plate molding part side, extending in a direction closer to a right angle than an angle formed.

本発明によれば、導光板形成部におけるヒケの発生が抑えられるため、導光板形成部の輝度ムラを押さえることができる。   According to the present invention, since the occurrence of sink marks in the light guide plate forming portion is suppressed, it is possible to suppress uneven brightness in the light guide plate forming portion.

本発明の一実施形態に係る金型の概略斜視図である。It is a schematic perspective view of the metal mold | die which concerns on one Embodiment of this invention. 図２は図１に示す金型のＩＩ−ＩＩ切断線における概略断面図である。2 is a schematic cross-sectional view taken along the line II-II of the mold shown in FIG. 図３は図１に示す金型のＩＩＩ領域の拡大概略平面図である。FIG. 3 is an enlarged schematic plan view of a region III of the mold shown in FIG. 本発明の一実施形態に係る導光板の概略斜視図である。It is a schematic perspective view of the light-guide plate which concerns on one Embodiment of this invention.

以下、本実施形態に係る金型１について図面に基づいて説明する。なお、以下の説明において参照する図面は、特徴をわかりやすくするために便宜上特徴となる部分を拡大して示している場合があり、各構成要素の寸法比率などは実際と同じであるとは限らない。また、以下の説明において例示される材料等は一例であって、各構成要素はそれらと異なっていてもよく、その要旨を変更しない範囲で変更して実施することが可能である。   Hereinafter, the metal mold | die 1 which concerns on this embodiment is demonstrated based on drawing. Note that the drawings referred to in the following description may show the features that are enlarged for convenience in order to make the features easier to understand, and the dimensional ratios of the respective components are not always the same as the actual ones. Absent. In addition, the materials and the like exemplified in the following description are examples, and each component may be different from them, and can be changed and implemented without changing the gist thereof.

図１は本発明の一実施形態に係る金型１の概略斜視図であり、図２は図１に示す金型１のＩＩ−ＩＩ切断線における概略断面図である。金型１は例えば金属からなり、キャビティ１ａとコア１ｂとを有している。金型１は、スプルー３と、ランナー５と、ゲート７と、導光板成型部９と、を有しており、キャビティ１ａとコア１ｂが合わさることで、スプルー３と、ランナー５と、ゲート７と、導光板成型部９は、後述する導光板を形成するための空間部分を構成する。   FIG. 1 is a schematic perspective view of a mold 1 according to an embodiment of the present invention, and FIG. 2 is a schematic cross-sectional view taken along the line II-II of the mold 1 shown in FIG. The mold 1 is made of metal, for example, and has a cavity 1a and a core 1b. The mold 1 includes a sprue 3, a runner 5, a gate 7, and a light guide plate molding portion 9, and the sprue 3, the runner 5, and the gate 7 are formed by combining the cavity 1 a and the core 1 b. And the light-guide plate shaping | molding part 9 comprises the space part for forming the light-guide plate mentioned later.

スプルー３は、図示しないノズルから射出された溶融樹脂をランナー５に流入させるための経路である。スプルー３はキャビティ１ａに設けられた中空の筒状構造であり、例えば、ノズル側からランナー５側に向かって末広がりの内周３ａを有している。   The sprue 3 is a path for allowing the molten resin injected from a nozzle (not shown) to flow into the runner 5. The sprue 3 has a hollow cylindrical structure provided in the cavity 1a. For example, the sprue 3 has an inner periphery 3a that spreads from the nozzle side toward the runner 5 side.

ランナー５は、スプルー３から流入した溶融樹脂をゲート７に導くための経路である。ランナー５は中空であり、筒状の構成を有している。本実施形態においては、１つのスプルー３に、例えば２本のランナー５が接続した構成を示すが、スプルー３に接続するランナー５の数は、２以上であってもよい。   The runner 5 is a path for guiding the molten resin flowing in from the sprue 3 to the gate 7. The runner 5 is hollow and has a cylindrical configuration. In the present embodiment, a configuration in which, for example, two runners 5 are connected to one sprue 3 is shown, but the number of runners 5 connected to the sprue 3 may be two or more.

ランナー５は、第１の方向（本実施形態においては、図中のＸ方向）に延在している。本実施形態における「第１の方向」とは、ランナー５のうち、ゲート７に接続する箇所５ａの軸線方向を示す。このため、ランナー５が折れ線形状で複数の方向に延在していても、ゲート７に接続する箇所５ａの軸線Ａの方向が「第１の方向」となる。第１の方向（方向Ｘ）は、ゲート７と後述する導光板成型部９との境界Ｂに対して垂直となる。   The runner 5 extends in the first direction (the X direction in the drawing in the present embodiment). The “first direction” in the present embodiment indicates the axial direction of the part 5 a connected to the gate 7 in the runner 5. For this reason, even if the runner 5 has a polygonal line shape and extends in a plurality of directions, the direction of the axis A of the portion 5a connected to the gate 7 becomes the “first direction”. The first direction (direction X) is perpendicular to the boundary B between the gate 7 and a light guide plate molding portion 9 described later.

ゲート７は、ランナー５から流入した溶融樹脂を導光板成型部９内に導くための部分である。ゲート７は中空であり、ランナー５の導光板成型部９側の端部５ｂと導光板成型部９の一側面９ａとを接続している。本実施形態における一側面９ａとは、導光板成型部９の複数の側面のうち、ランナー５側の側面を示す。一側面９ａは、境界Ｂに沿って延在する。   The gate 7 is a part for guiding the molten resin flowing from the runner 5 into the light guide plate molding part 9. The gate 7 is hollow and connects the end portion 5 b of the runner 5 on the light guide plate molding portion 9 side and one side surface 9 a of the light guide plate molding portion 9. In the present embodiment, the one side surface 9 a indicates a side surface on the runner 5 side among the plurality of side surfaces of the light guide plate molding part 9. The one side surface 9a extends along the boundary B.

図３は図１に示す金型１のＩＩＩ領域の拡大概略平面図である。ゲート７は、平面視で一側面９ａ側に近づくにつれ、その幅が広くなる。ゲート７の平面視形状は、ランナー５の端部５ｂに接続し、第１の方向Ｘに延在する軸線Ａに交差する方向に延びる第１の辺７ａと、第１の辺７ａの導光板成型部９側の端部７ａ１に接続する第２の辺７ｂと、を有している。 3 is an enlarged schematic plan view of a region III of the mold 1 shown in FIG. The width of the gate 7 increases as it approaches the side surface 9a in plan view. The plan view shape of the gate 7 is connected to the end portion 5b of the runner 5 and has a first side 7a extending in a direction intersecting the axis A extending in the first direction X, and a light guide plate of the first side 7a. It has a second side 7b to be connected to the end portion 7a 1 of the molded part 9 side.

第１の辺７ａが第１の方向Ｘ（軸線Ａ）と成す角度を角度αとすると、第２の辺７ｂが第１の方向Ｘ（軸線Ａ）と成す角度βは、角度αよりも直角に近い値となる。すなわち、第２の辺７ｂは、軸線Ａと角度βで交差する方向に延びている。   Assuming that the angle formed by the first side 7a and the first direction X (axis A) is an angle α, the angle β formed by the second side 7b and the first direction X (axis A) is perpendicular to the angle α. A value close to. That is, the second side 7b extends in a direction intersecting with the axis A at an angle β.

また、ゲート７は、その幅が平面視で一側面９ａ側に近づくにつれ広くなるのであれば、第２の辺７ｂの導光板成型部９側の端部７ｂ１に第３の辺７ｃが接続していてもよい。また、ゲート７が有する辺は３つに限られず、これ以上であってもよい。 The gate 7, as long as its width increases as it approaches the one side surface 9a side in a plan view, the third side 7c is connected to an end portion 7b 1 of the light guide plate molding portion 9 side of the second side 7b You may do it. Further, the side of the gate 7 is not limited to three and may be more than this.

また、導光板成型部９の一側面９ａに接続するゲート７の側面７ｄの幅ｄ１は、平面視で導光板成型部９の一側面９ａの幅ｄ２と同じであることが望ましい。本実施形態においては、第３の辺７ｃの端部７ｃ１が、導光板成型部９の一側面９ａの端部９ａ１に接続しているため、側面７ｄの幅ｄ１（端部７ｃ１同士の幅）は一側面９ａの幅ｄ２（端部９ａ１同士の幅）と等しくなる。 The width d 1 of the side surface 7d of the gate 7 connected to the one side surface 9a of the light guide plate molding portion 9 is preferably the same as the width d 2 of the one side surface 9a of the light guide plate molding portion 9 in plan view. In the present embodiment, since the end portion 7c 1 of the third side 7c is connected to the end portion 9a 1 of the one side surface 9a of the light guide plate molding portion 9, the width d 1 (end portion 7c 1) of the side surface 7d. The width between them is equal to the width d 2 of one side surface 9a (the width between the end portions 9a 1 ).

また、図２に示すように、ゲート７の厚みは、ランナー５の端部５ｂから境界Ｂにかけて薄くなっていてもよい。   Further, as shown in FIG. 2, the thickness of the gate 7 may be reduced from the end 5 b of the runner 5 to the boundary B.

導光板成型部９は、充填された溶融樹脂を、導光板に成型するための中空の領域である。導光板成型部９は平面視でランナー５よりも広い幅を有しており、その空間の外形は板状の構成を有している。   The light guide plate molding unit 9 is a hollow region for molding the filled molten resin into the light guide plate. The light guide plate molding part 9 has a width wider than the runner 5 in plan view, and the outer shape of the space has a plate-like configuration.

図２，３に示すように、導光板成型部９の端部で、かつ、キャビティ１ａとコア１ｂのパーティングライン１ｃに重なる箇所には、例えば孔状の、空気抜き用の空気抜き部９ｂが設けられていることが好ましい。空気抜き部９ｂの設けられた箇所は、ゲート７の境界Ｂからの距離が大きいほど好ましい。また、空気抜き部９ｂは、空気抜きができる構造であれば、孔状でなく溝状であってもよい。   As shown in FIGS. 2 and 3, for example, a hole-like air venting portion 9 b for venting air is provided at the end of the light guide plate molding portion 9 and at a portion overlapping the parting line 1 c of the cavity 1 a and the core 1 b. It is preferable that The location where the air vent 9b is provided is preferably as the distance from the boundary B of the gate 7 increases. Further, the air vent portion 9b may have a groove shape instead of a hole shape as long as the air vent portion 9b can be vented.

金型１はこのような構成を有することにより、スプルー３に、図示しないノズルから、導光板の材料である溶融樹脂が注入されると、溶融樹脂は、スプルー３、ランナー５、ゲート７を順次通過して導光板成型部９内に充填される。そして、溶融樹脂を硬化して金型１から取り出すことにより、図４に示す導光板２０が形成される。   Since the mold 1 has such a configuration, when molten resin as a light guide plate material is injected into the sprue 3 from a nozzle (not shown), the molten resin sequentially passes through the sprue 3, the runner 5, and the gate 7. It passes through and is filled in the light guide plate molding part 9. And the light guide plate 20 shown in FIG. 4 is formed by hardening | curing molten resin and taking out from the metal mold | die 1. FIG.

図４は本発明の一実施形態に係る導光板２０の概略斜視図である。導光板２０の外形は、ランナー５とゲート７と導光板成型部９の形状と同一となる。このため、導光板２０は、スプルー部２３と、第１の方向（Ｘ方向）に延在するランナー部２５と、平面視でランナー部２５よりも広い幅を有する板状の導光板形成部２９と、ランナー部２５の導光板形成部２９側の端部２５ｂと導光板形成部２９の一側面２９ａとを接続し、平面視で一側面２９ａに近づくにつれ、その幅が広くなるゲート部２７と、を有している。   FIG. 4 is a schematic perspective view of the light guide plate 20 according to an embodiment of the present invention. The outer shape of the light guide plate 20 is the same as that of the runner 5, the gate 7, and the light guide plate molding part 9. For this reason, the light guide plate 20 includes a sprue portion 23, a runner portion 25 extending in the first direction (X direction), and a plate-shaped light guide plate forming portion 29 having a width wider than the runner portion 25 in plan view. And the end portion 25b on the light guide plate forming portion 29 side of the runner portion 25 and one side surface 29a of the light guide plate forming portion 29 are connected, and the width of the gate portion 27 increases as it approaches the one side surface 29a in plan view. ,have.

また、ゲート部２７の平面視形状は、ランナー部２５の端部２５ｂに接続し、第１の方向（方向Ｘ）に交差する方向に延びる第１の辺２７ａと、第１の方向Ｘと成す角度βが、第１の辺２７ａが第１の方向Ｘと成す角度αよりも直角に近い方向に延びる、第１の辺２７ａの導光板形成部２９側の端部２７ａ１に接続する第２の辺２７ｂと、を有している。 Moreover, the planar view shape of the gate part 27 comprises the 1st edge | side 27a connected to the edge part 25b of the runner part 25, and the 1st direction 27 extended in the direction which cross | intersects a 1st direction (direction X). angle β is, the first side 27a extending in a direction nearly at right angles than the angle α formed by the first direction X, is connected to the end portion 27a 1 of the light guide plate forming portion 29 side of the first side 27a 2 Side 27b.

また、ゲート部２７は、その幅が平面視で一側面２９ａ側に近づくにつれ広くなるのであれば、第２の辺２７ｂの導光板形成部２９側の端部２７ｂ１に第３の辺２７ｃが接続していてもよい。また、ゲート部２７が有する辺は３つに限られず、これ以上であってもよい。 The gate portion 27, as long as its width increases as it approaches the one side surface 29a side in a plan view, the third side 27c to the end portion 27b 1 of the light guide plate forming portion 29 side of the second side 27b is It may be connected. Moreover, the side which the gate part 27 has is not restricted to three, The number beyond this may be sufficient.

また、本実施形態における導光板２０は、ゲート部２７の側面２７ｄの幅ｄ１が、平面視で導光板形成部２９の一側面２９ａの幅ｄ２と同じとなる。 In the light guide plate 20 in the present embodiment, the width d 1 of the side surface 27 d of the gate portion 27 is the same as the width d 2 of the one side surface 29 a of the light guide plate forming portion 29 in plan view.

本実施形態の金型１は、ゲート７が第１の辺７ａと、軸線Ａに対して第１の辺７ａよりも直角に近い角度で伸びる第２の辺７ｂとを有していることにより、溶融樹脂が高速でランナー５からゲート７に流入しても、溶融樹脂は第１の辺７ａから第２の辺７ｂに沿って、広がりながら導光板成型部９内に注入される。これにより、溶融樹脂が高速で導光板成型部９内に注入されることが防がれる。このため、導光板成型部９内に充填された溶融樹脂を硬化しても、導光板２０にヒケが発生することが抑えられ、導光板２０の各領域における輝度ムラと色度差を低減することができる。   The mold 1 of the present embodiment has a gate 7 having a first side 7a and a second side 7b extending at an angle closer to a right angle with respect to the axis A than the first side 7a. Even if the molten resin flows from the runner 5 to the gate 7 at a high speed, the molten resin is injected into the light guide plate molding portion 9 while spreading from the first side 7a to the second side 7b. This prevents the molten resin from being injected into the light guide plate molding unit 9 at a high speed. For this reason, even if the molten resin filled in the light guide plate molding portion 9 is cured, the occurrence of sink marks in the light guide plate 20 is suppressed, and luminance unevenness and chromaticity difference in each region of the light guide plate 20 are reduced. be able to.

また、本実施形態の金型１は、ゲート７が第１の辺７ａと、軸線Ａに対して第１の辺７ａよりも直角に近い角度で伸びる第２の辺７ｂとを有していることにより、本構成を有さない金型と比べ、ゲート７の体積が小さくなる。このため、ゲート７を介して導光板成型部９内に溶融樹脂を充填するために必要な溶融樹脂の圧力を低減することができる。これにより、導光板２０の成形ムラが抑えられる。   In the mold 1 of the present embodiment, the gate 7 has a first side 7a and a second side 7b extending with respect to the axis A at an angle closer to a right angle than the first side 7a. As a result, the volume of the gate 7 becomes smaller than that of a mold not having this configuration. For this reason, the pressure of the molten resin required to fill the molten resin into the light guide plate molding portion 9 through the gate 7 can be reduced. Thereby, the shaping | molding nonuniformity of the light-guide plate 20 is suppressed.

また、溶融樹脂が高温のまま導光板成型部９内に注入されることが防がれるため、導光板２０の面内における色度差を低減することができる。   Moreover, since molten resin is prevented from being injected into the light guide plate molding part 9 at a high temperature, the chromaticity difference in the surface of the light guide plate 20 can be reduced.

また、本実施形態の金型１は、ゲート７の厚みが、ランナー５の端部５ｂから境界Ｂにかけて薄くなっていることにより、本構成を有さない金型と比べ、ゲート７の体積が小さくなる。このため、ゲート７内全体に溶融樹脂を充填するために必要な圧力を低減することができ、導光板２０の成形ムラと、輝度ムラが抑えられる。   Further, in the mold 1 of the present embodiment, the gate 7 has a smaller volume from the end 5b of the runner 5 to the boundary B, so that the volume of the gate 7 is smaller than that of the mold not having this configuration. Get smaller. For this reason, the pressure required for filling the entire inside of the gate 7 with the molten resin can be reduced, and uneven formation of the light guide plate 20 and uneven brightness can be suppressed.

また、本実施形態の金型１は、ゲート部７の側面７ｄの幅ｄ１が、平面視で導光板成型部９の一側面９ａの幅ｄ２と同じであることにより、ゲート部７から導光板成型部９内に樹脂が注入された際の、境界Ｂにおける圧力の変動が抑えられる。このため、導光板２０におけるヒケの発生が抑えられる。 Further, in the mold 1 of the present embodiment, the width d 1 of the side surface 7d of the gate portion 7 is the same as the width d 2 of the one side surface 9a of the light guide plate molding portion 9 in plan view. The pressure fluctuation at the boundary B when the resin is injected into the light guide plate molding portion 9 is suppressed. For this reason, the occurrence of sink marks in the light guide plate 20 is suppressed.

また、本実施形態の金型１は、空気抜き部９ｂが設けられていることにより、本構成を有さない金型と比べ、導光板成型部９内に溶融樹脂が充填された際における空気溜まりの発生を防ぐことができる。   Further, the mold 1 of the present embodiment is provided with the air vent part 9b, so that the air reservoir when the molten resin is filled in the light guide plate molding part 9 is compared with a mold that does not have this configuration. Can be prevented.

以上、本発明の実施形態を説明してきたが、本発明は、上述した実施形態には限られない。例えば、上述した実施形態で説明した構成は、実質的に同一の構成、同一の作用効果を奏する構成、又は同一の目的を達成することができる構成により置き換えてもよい。   As mentioned above, although embodiment of this invention was described, this invention is not restricted to embodiment mentioned above. For example, the configuration described in the above-described embodiment may be replaced by a configuration that has substantially the same configuration, a configuration that exhibits the same operational effects, or a configuration that can achieve the same purpose.

１ 金型、３ スプルー、５ ランナー、５ｂ 端部、７ ゲート、７ａ 第１の辺、７ａ１ 端部、７ｂ 第２の辺、７ｄ 側面、９ 導光板成型部、９ａ 一側面、９ｂ 空気抜き部、２０ 導光板、２５ ランナー部、２５ｂ 端部、２７ ゲート部、２７ａ 第１の辺、２７ａ１ 端部、２７ｂ 第２の辺、２７ｂ１ 端部、２７ｄ 側面、２９ 導光板形成部、２９ａ 一側面、Ａ 軸線、Ｂ 境界、ｄ１,ｄ２ 幅、Ｘ 第１の方向、α,β 角度。 1 mold, 3 sprue, 5 runner, 5b end, 7 gate, 7a first side, 7a 1 end, 7b second side, 7d side, 9 light guide plate molding part, 9a one side, 9b air vent 20 light guide plate, 25 runner portion, 25b end portion, 27 gate portion, 27a first side, 27a 1 end portion, 27b second side, 27b 1 end portion, 27d side surface, 29 light guide plate forming portion, 29a Side, A axis, B boundary, d 1 , d 2 width, X first direction, α, β angle.

Claims (3)

第１の方向に延在するランナー部と、
平面視で前記ランナー部よりも広い幅を有する板状の導光板形成部と、
前記ランナー部の前記導光板形成部側の端部と前記導光板形成部の一側面とを接続し、平面視で前記一側面に近づくにつれ、その幅が広くなるゲート部と、
を備え、
前記ゲート部の平面視形状は、
前記ランナー部の前記端部に接続し、前記第１の方向に交差する方向に延びる第１の辺と、
前記第１の方向と成す角度が、前記第１の辺が前記第１の方向と成す角度よりも直角に近い方向に延びる、前記第１の辺の前記導光板形成部側の端部に接続する第２の辺と、
を、有することを特徴とする導光板。 A runner portion extending in a first direction;
A plate-shaped light guide plate forming part having a width wider than the runner part in plan view;
Connecting the end portion on the light guide plate forming portion side of the runner portion and one side surface of the light guide plate forming portion, and a gate portion whose width becomes wider as approaching the one side surface in plan view;
With
The shape of the gate portion in plan view is
A first side connected to the end of the runner portion and extending in a direction intersecting the first direction;
The angle formed with the first direction extends in a direction closer to a right angle than the angle formed by the first side with the first direction, and is connected to the end of the first side on the light guide plate forming unit side A second side to
A light guide plate characterized by comprising: 請求項１に記載の導光板であって、
前記導光板形成部の前記一側面に接続する前記ゲート部の側面の幅が、平面視で前記一側面の幅と同じである、
ことを特徴とする導光板。 The light guide plate according to claim 1,
The width of the side surface of the gate portion connected to the one side surface of the light guide plate forming portion is the same as the width of the one side surface in plan view.
A light guide plate characterized by that. 第１の方向に延在する筒状のランナーと、
平面視で前記ランナーよりも広い幅を有する、中空の導光板成型部と、
前記ランナーの前記導光板成型部側の端部と前記導光板成型部の一側面とを接続し、平面視で前記一側面に近づくにつれ、その幅が広くなる中空のゲートと、
を備え、
前記ゲートの平面視形状は、
前記ランナーの前記端部に接続し、前記第１の方向に交差する方向に延びる第１の辺と、
前記第１の方向と成す角度が、前記第１の辺が前記第１の方向と成す角度よりも直角に近い方向に延びる、前記第１の辺の前記導光板成型部側の端部に接続する第２の辺と、
を、有することを特徴とする金型。 A cylindrical runner extending in a first direction;
A hollow light guide plate molding portion having a width wider than the runner in plan view,
The end of the runner on the light guide plate molding part side and one side surface of the light guide plate molding part are connected, and a hollow gate whose width becomes wider as it approaches the one side surface in plan view,
With
The shape of the gate in plan view is
A first side connected to the end of the runner and extending in a direction intersecting the first direction;
The angle formed with the first direction extends in a direction closer to a right angle than the angle formed by the first side with the first direction, and is connected to the end of the first side on the light guide plate molding unit side A second side to
A mold characterized by having.
JP2013194342A 2013-09-19 2013-09-19 Light guide plate and metallic mold Pending JP2015058642A (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023169832A1 (en) * 2022-03-10 2023-09-14 HELLA GmbH & Co. KGaA Lighting apparatus for vehicles and injection moulding machine

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JP7198010B2 (en) * 2018-07-19 2022-12-28 株式会社小糸製作所 resin parts
CN109501134B (en) * 2018-11-21 2021-02-05 Oppo（重庆）智能科技有限公司 Mold, light guide plate and processing method thereof, display screen and electronic equipment
CN109501136B (en) * 2018-11-21 2021-01-19 Oppo（重庆）智能科技有限公司 Mold, light guide plate and processing method thereof, display screen and electronic equipment

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023169832A1 (en) * 2022-03-10 2023-09-14 HELLA GmbH & Co. KGaA Lighting apparatus for vehicles and injection moulding machine

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