200842022 (1) 九、發明說明 【發明所屬之技術領域】 本發明係關於藉由射出成形（包括射出壓縮成形）來 在模具內進行導光板的成形之導光板之成形方法，特別是 關於行動電話等所使用之對角尺寸7吋以下之導光板的成 '形方法。 φ 【先前技術】 關於利用射出成形（包括射出壓縮成形）之導光板之 成形取出方法，在專利文獻1中已有記載。專利文獻1係 關於大型導光板的成形，通常在進行大型導光板的成形時 ’僅成形時間（閉模完成後經射出迄開始開模爲止的時間 )就必須耗費3 0秒以上。專利文獻1記載之取出方法， 係從上側的2根繫桿間取出導光板，再將其移動至其他的 裝載位置，因此在成形循環時間之縮短方面會發生問題。 # 又在專利文獻1中，1次成形循環時間爲40秒以上。又 關於小型導光板之成形循環時間，爲了進行圖案之轉印成 ^ 形必須耗費較長的成形時間，又在取出時也會耗費時間， 通常1次的成形循環時間必須1 5秒以上，因此在成形循 ^ 環時間之縮短方面會發生問題。 〔專利文獻1〕日本特開20〇3- 1 45 593號公報（申請 專利範圍第4項、第2圖） 【發明內容】 -4 - 200842022 (2) 本發明係有鑑於上述問題點而構成者，其目的係提供 一種導光板之成形方法，在藉由包含射出壓縮成形之射出 成形來進行導光板之成形時，可縮短導光板之成形時間及 取出時間，以謀求成形循環時間之縮短化。 ' 本發明的請求項1所記載之導光板之成形方法，係藉 •由射出成形來在模具內進行導光板的成形之導光板之成形 方法，其特徵在於：自閉模完成經射出迄開始開模爲止以 φ 1.75〜6秒以內的時間進行，自開始開模經取出導光板迄 閉模完成爲止以0.75〜2.2秒以內的時間進行。 依據本發明之藉由射出成形來在模具內進行導光板的 成形之導光板之成形方法，由於自閉模完成經射出迄開始 開模爲止以6秒以內的時間進行，自開始開模經取出導光 板迄閉模完成爲止以2.2秒以內的時間進行，故能實現以 往想像不到之成形循環時間的縮短化。 φ 【實施方式】 參照第1圖至第1 3圖來說明本發明的導光板之射出 壓縮成形模具。第1圖係從可動盤側朝固定盤側觀察本實 施形態的導光板之取出裝置之前視圖。第2圖係本實施形 ' 態的導光板之取出裝置之側視圖。第3圖係本實施形態的 導光板之取出裝置之主要部分放大立體圖。第4圖係本賨 施形態所使用之導光板之射出壓縮成形模具之截面圖。第 5至7圖係顯示本實施形態的導光板之射出壓縮成形方法 之流程圖。第8圖係本實施形態的導光板之射出壓縮成形 -5- 200842022 (3) 模具之澆道襯套之放大截面圖。第9至13圖係 施形態之導光板之射出壓縮成形模具之澆道形狀 環時間的關係。 本實施形態之導光板p，係藉由屬於射出成 ~ 射出壓縮成形來成形出。射出壓縮成形’係在成 、至成形結束時的期間可改變可動模具和固定模具 。因此，在閉模後的停止位置射出熔融樹脂後， Φ 具前進而進行壓縮之所謂「射出模壓」形式’也 壓縮成形。在射出壓縮成形’相較於成形完成時 始射出前或開始射出後模穴呈稍打開的狀態，故 具有高速射出能力之射出裝置，而能以較低速、 出熔融樹脂。又在開始射出後，使可動模具朝合 動以壓縮熔融樹脂，因此在模穴之離澆口部較遠 加快熔融樹脂的流動，以良好地進行微細圖案的 在切斷澆口後，在通常的射出成形模具，並無法 Φ 置進行保壓，但在射出壓縮成形的情形，可將模 融樹脂壓縮來對應於冷卻硬化所產生之收縮。這 縮成形，特別適用於板厚較薄（相較於光出射面 )之導光板的成形。 如第1圖及第2圖所示，在射出壓縮成形彳 將具備加熱筒12a (內設螺桿）、噴嘴12b之射 以及合模裝置1 4，配設於機床1 5上。合模裝置 固定於機床15之固定盤17(裝設有固定模具1< 於機床1 5之受壓盤1 8之間，配設4根繫桿1 ί 示本實 和成形循 形領域之 形開始時 間的距離 使可動模 屬於射出 ，由於開 不須使用 低壓來射 模方向移 的位置能 轉印。又 從射出裝 穴內之熔 種射出壓 等的面積 幾1 1，係 出裝置13 14，係在 )和配設 。裝設有 -6 - 200842022 (4) 可動模具20之可動盤21，係以可移動的方式組裝於前述 繫桿1 9。在受壓盤1 8上，配設用來進行開閉模及合模之 合模汽缸22 (開閉^模及合模機構），前述合模汽缸22之 衝柱22a係固定在可動盤21的背面。本實施形態之合模 汽缸22，係藉由伺服閥之控制將壓送油送往助力汽缸（ 截面積較小）而使可動盤能以高速進行閉模。在開模時， 藉由伺服閥之控制將壓送油送往開模側油室（截面積較小 )而能以高速進行開模。在本實施形態，其最高規格爲在 開模閉模側都能以0·3秒進行開閉模。在本實施形態之開 閉模及合模機構，雖是使用藉由伺服閥控制之合模汽缸 22，但也能使用含有伺服馬達（起動旋轉驅動速度及停止 速度優異）和滾珠螺桿之时節機構。這時也能實現前述速 度。 接著說明，用來從射出壓縮成形機1 1之射出壓縮成 形模具5 1取出成形出的導光板Ρ之取出裝置。如第1圖 及第2圖所示，取出裝置係具備：固定在固定盤I?的反 操作側（操作盤之相反側）的上面之第1取出裝置23、 設置在托架25 (固定在反操作側的機床1 5 )上之第2取 出裝置24。在第1取出裝置23，設有朝開閉模方向延伸 之旋轉軸26，在與旋轉軸26正交的方向固設有臂部27。 旋轉軸2 6，係藉由未圖示之第1伺服馬達和滾珠螺桿機 構在軸方向（開閉模方向）進退移動，且受未圖示之第2 伺服馬達驅動而旋轉，其能以高精度進行高速動作及急停 。因此第1取出裝置23也稱爲搖臂式取出裝置。用來從 200842022 (5) 可動模具20直接取出導光板P等之第1取出裝置23的臂 部27，具有既定厚度，依接近旋轉軸26的順序，係由第 1 -構件27a (朝旋轉軸26之垂直方向設置）、第2構件 27b (相對於第1構件27a，連接設置於傾斜方向）、第3 構件27c (連接於第2構件27b，且朝第1構件27a之大 •致垂直方向設置）三者一體所組成之大致L字狀的臂構件 所構成。前述第3構件27c，係以朝可動模具20之模穴 φ 形成面附近的方式向內側彎曲。臂部27的形狀，在不干 涉繫桿1 9、安全門等的範圍內，也能採用兩邊所構成之 直角形、圓弧狀等其他的形狀。 本實施形態之第1取出裝置之臂部，係由碳所形成而 達成輕量化。也能用鋁等比重比鐵輕的材料來形成臂部。 包含馬達部分之本體重量爲1 5〜2 5 kg，因此屬於低慣性 構造。其驅動源之伺服馬達，係起動旋轉驅動速度及停止 速度優異之馬達。因此，在輸入開模訊號後，從待機位置 φ 迄搬入位置之臂部移動時間僅0.04秒，吸附取出時間 〇 · 〇 7秒，從搬出旋轉開始迄旋轉停止之臂部移動時間爲 0.04秒’亦即第1取出裝置之最快規格爲合計〇.15秒即 可輸出開模訊號。又在取出2個7吋導光板的情形也是花 同樣的時間。藉由第1取出裝置進行取出所耗時間，不管 是導光板不容易從模穴進行脫模的情形、或是吸附保持部 之痕跡容易附著的情形，時間最長都不會超過1 ·〇秒。 如第3圖所示’第丨取出裝置23的臂部27之第3構 件27c’整體爲具有固定模具側面和可動模具側面之板狀 -8- 200842022 (6) ，在前端側形成朝向基部側之v槽28 ’在V槽28兩側形 成分枝部29a、29b。在前述V槽28之內側空間部配設夾 頭30。夾頭30，係藉由電磁式的作動裝置30a(配設於 比分枝部2 9 a、2 9 b的接合部分更靠基部側之固定模具側 的面）來使2個夾頭構件做開閉作動，以進行澆道P1把 •持或釋放。在前述分枝部29a、29b之接合部分附近之可 動模具側的面，配設反射型的檢測器3 1。前述檢測器3 1 φ ，係檢測是否把持有澆道P 1，當澆道P1的把持狀態不正 常時，使開閉模及合模機構停止動作。 相對於臂部27的第3構件27c，在垂直方向配設安 裝板32。安裝板32之上部至下部（比第3構件27c更上 部或更下部）的長度，係與待成形之導光板P之縱方向長 度一致。在該安裝板3 2之可動模具20側的面上，以朝向 可動模具20側的方式，在安裝板32之上部兩部位、下部 兩部位，分別固設有用來吸附導光板P之吸附保持部3 3 φ 。吸附保持部3 3係具備：多孔質彈性材料（海綿）之杯 部34、用來將該杯部34安裝於安裝板32之捲絃狀的彈 簧部35、以及配管36等等。杯部34，宜使用耐熱性優異 的彈性體，例如多孔質矽橡膠或多孔質氟橡膠。杯部3 4 係具備：厚度5 mm左右之圓盤部34b (含有直徑8〜 16mm之吸附面34a )、位於其後方之V槽狀的縮頸部 34c、位於更後方之基部34d。前述基部34d，係固接於捲 絃狀的彈簧部3 5，前述彈簧部3 5的另一側則固定於安裝 板3 2。吸附面3 4 a，在中心形成有直徑1 mm左右的吸引 200842022 (7) 孔34e，在周圍形成微細的小孔，其整體呈平面狀。前述 吸引孔34e，係在軸方向貫穿前述圓盤部34b、縮頸部 34c、基板34d，且在基部34d側之吸引孔34e的開口部 連接設置可撓性樹脂構成之配管3 6。該配管3 6，係以通 過前述彈簧部35內部的方式，固定於臂部27而延伸出， ‘並進接於未圖示之真空裝置。 固定於射出壓縮成形機1 1的反操作盤側的機床丨5側 0 面之托架25上，係設有第2取出裝置24，其係雙軸式的 移載機器人，亦即具備：以能旋轉驅動的方式配設於與射 出壓縮成形機1 1的開閉模方向平行的方向之第1旋轉軸 3 7、配設成能相對於固定軸3 8 (固定於前述第1旋轉軸 3 7之垂直方向）進行旋轉之第2旋轉軸3 9。前述第1旋 轉軸3 7、第2旋轉軸3 9，都是藉由未圖示之第3伺服馬 達及第4伺服馬達進行旋轉驅動，而能以高精度進行高速 動作及急停。 • 在第2旋轉軸39的前端固設臂部40。臂部40具有 既定厚度，依接近前述第2旋轉軸3 9的順序，係具備： . 與前述第2旋轉軸39形成同軸之第1構件40a、相對於 前述第1構件40a以既定角度（在本實施形態，係相對直 立方向，朝射出壓縮成形機側傾斜約60。）傾斜之第2構 件40b。第2取出裝置24能停在一定位置，而使第1取 出裝置23之交接位置（釋放位置）A2之吸附保持部33 的排列方向、和第2取出裝置24之交接位置（待機位置 )B1之第2構件40b的方向一致。 -10- 200842022 (8) 在臂部40之第2構件40b之固定模具16側的面上， 以和前述第1取出裝置23隔著相同間隔的方式配設吸附 保持部41。第2取出裝置24之吸附保持部41，係具備橡 膠墊之一般的吸附杯。吸附保持部41係經由彈簧安裝於 臂部40，未圖示之具有可撓性的樹脂配管係連接於前述 吸附杯之吸引孔。又前述樹脂配管係通過彈簧內部而固定 於臂部40，並進接於未圖示之真空裝置，這點是和第1 取出裝置23相同。 隔著第2取出裝置24而在射出壓縮成形機11之相反 側（反操作側）的地板上，在比前述第2取出裝置24之 第1旋轉軸37更低的位置配設帶式輸送機42。帶式輸送 機42爲一般型，藉由未圖示之馬達而將既定寬度的橡膠 皮帶43實施間歇驅動。 如第1圖及第2圖所示，在射出壓縮成形機11之反 操作側的機床15側面，在第2取出裝置24之射出裝置 1 3側配設上方開口之漏斗狀的滑槽44。滑槽44，係配設 於第1取出裝置23之交接位置（釋放位置）A2的下方， 以在第1取出裝置23釋放澆道P1時將該澆道P1予以收 集（當作收容構件）。在第1圖、第2圖，關於滑槽44 下方的管45，並未記載其整個管路（自中途省略），其 可採用以下設計：使澆道P1落至未圖示之收集箱；或是 使管路連接至射出裝置的上部，用空氣等手段搬送前述澆 道P1，將其從射出裝置的投入口投入而進行回收使用。 在取出裝置23、24之移動區域及可動模具20之移動區域 -11 - 200842022 (9) ，係設有安全門以及防護柵等，在此省略其等的圖示。 接著用第4圖來說明本實施形態的導光板之射出壓縮 成形模具5 1。射出壓縮成形模具5 1，係由第1模具之可 動模具20和第2模具之固定模具1 6所組成，在合模後之 兩模具20、16之間，形成有容積及厚度可變之模穴C1、 • C2 (適用於射出壓縮成形或射出模壓成形）。可動模具 20係具備：模具本體部52、模芯部53、可動框部54等 φ 等。模芯部53係固接於模具本體部52，設於其周圍之可 動框部54係藉由彈簧54a安裝於模具本體部52。因此在 可動框部20，模芯部53和可動框部54在開閉模方向之 相對位置可改變。在模芯部5 3，固定有兩個模穴形成塊 55、55，在模穴形成塊55、55分別形成有模穴形成面 5 5a、5 5 a ° 在模具本體部52及模芯部53之中央部之與固定模具 1 6的澆道襯套64相對向的位置，配設頂出裝置之突出銷 φ 56 (藉由未圖示之驅動裝置前進，藉由彈簧而後退）。在 前述突出銷5 6之前端面，設有用來將澆道P 1拉向可動模 具20側之咬入部56a。從前述咬入部56a朝各模穴形成 面5 5 a形成有流道形成面5 7 (用來形成流道P2 )。在可 ~ 動模具20，以鄰接於模穴形成塊5 5的方式配設有澆口切 斷具58 (藉由未圖示之驅動裝置前進，藉由彈簧而後退 )。當澆口切斷具5 8前進時，藉由和固定模具16之固定 澆口切斷具65交錯，能將澆口 P3切斷。在可動模具20 內設有兩系統的流路，亦即包括··用來冷卻模穴形成面 -12- 200842022 (10) 55a之模穴用冷卻媒體流路59、用來冷卻流道形成57和 突出銷56等之冷卻媒體流路60。 第2模具之固定模具16係具備：模具本體部61、形 成有模穴形成面62a之模穴形成塊62、嵌塊63、澆道襯 套64、固定澆口切斷具65、抵接塊66等。繞道襯套64 * 係從噴嘴1 2b射出熔融樹脂時的通路，嵌塊63的表面係 構成流道形成面67。固定澆口切斷具65係設置成，和模 φ 穴形成塊62相鄰’且能和澆口切斷具58交錯。在固定模 具1 6內設有兩系統的流路，亦即包括：用來冷卻模穴形 成面62a之模穴用冷卻媒體流路69、用來冷卻流道形成 面67以及澆道襯套64等之澆道用冷卻媒體流路70 ;其 屬於冷流道（包含澆道）型。在本實施形態，在射出壓縮 成形模具5 1沿縱向配設2個模穴C 1、C 2，但也能沿水平 方向形成2個模穴，模穴的數目例如可爲1個或4個等的 複數。對應於前述模穴的數目、配置，來決定取出裝置的 φ 吸附保持部之數目和配置。 接著，用第5圖之流程圖來說明，使用本實施形態的 . 射出壓縮成形機11之導光板P的射出壓縮成形方法。在 本實施形態，係將對角尺寸3吋、板厚0.4mm之導光板P 用4.4秒的成形循環時間來進行成形。其中，開模時間 0.5秒，取出時間0·4秒，閉模時間0.5秒，從開始開模 經取出導光板Ρ到閉模完成之時間爲1 · 4秒。又該從開始 開模經取出導光板Ρ到閉模完成之時間宜爲2 · 2秒以內（ 0.75〜2 ·2秒），更佳爲1.5秒以內（0.75〜1.5秒）。前 -13- 200842022 (11) 述從開始開模經取出導光板P到閉模完成之時間中最快之 〇·75秒，係前述般使用伺服機構（開閉模及合模機構）及 伺服馬達之搖動型取出裝置所能實現之最短時間。又前述 從開始開模經取出導光板P到閉模完成之時間中最慢之 2.2秒，這時如後述般，開模、閉模皆爲〇·6秒，取出時 • 間1 . 〇秒。花費1 . 〇秒的取出時間的情形，係指空氣脫模 速度很慢的情形，或用極低速來抵接於成形出的導光板以 φ 避免導光板上發生保持痕跡的情形。若進一步延長開閉模 時間，不僅會增加成形循環時間而造成生產效率變差，且 在射出裝置之加熱筒內熔融樹脂之滯留時間變得過長，噴 嘴會被冷卻而產生冷料塊（cold slug)。又從閉模完成經 射出迄開始開模之時間爲3 · 0秒，其中，射出遲延時間（ 增壓時間）〇·1秒，射出時間0.05秒，保壓時間0.45秒 ，冷卻時間2.4秒（實質上的冷卻是從開始射出後才進行 )。然而，該從閉模完成經射出迄開始開模之時間，會依 Φ 導光板的形狀（面積、板厚、轉印面形狀）而在1 ·75〜6 秒的範圍內改變，爲了進一步縮短成形循環時間，宜控制 在4秒以內（1 · 7 5〜4 · 0秒）。 又只要導光板Ρ之尺寸在此範圍內，則不太會影響成 形循環時間，但若要進一步縮短成形循環時間’澆道Ρ1 的冷卻時間不足而造成硬化不足，會發生澆道Ρ1無法拔 取等的問題。第6圖、第7圖係顯示本實施形態的導光板 之射出壓縮成形方法之流程圖，第6圖顯示成形循環時間 2.5秒的例子，第7圖顯示成形循環時間6秒的例子。成 -14- 200842022 (12) 形循環時間2.5秒的情形，如第6圖之導光板之射出壓縮 成形方法之流程圖所示，開閉模時間（包含取出時間、中 間時間）0·75秒，射出遲延時間（增壓時間）〇.1秒，射 出時間0.05秒，保壓時間0.4秒，冷卻時間1.2秒（從閉 模完成迄開始開模1.75秒）。只要導光板Ρ之尺寸在此 範圍內，則不太會影響成形循環時間，但若要進一步縮短 成形循環時間，會造成澆道Ρ1 (厚度最厚）硬化不足， φ 而發生澆道ρ1無法拔取等的問題。如第7圖所示，對角 尺寸3吋、板厚0 · 6 mm (均一板厚）之具有轉印圖案的導 光板，能以成形循環時間6 · 0秒藉由射出壓縮成形進行成 形，這時之冷卻時間爲3.9秒。 如上述般，決定本發明之成形循環時間中的冷卻時間 之最有影響力的要素，係如第8圖所示之澆道Ρ1的直徑 及錐角（脫模傾斜角度）0。在本實施形態，射出裝置之 噴嘴之噴嘴孔（未圖示）的直徑爲1.5mm。在進行澆道之 • 脫模時，爲了良好地除去噴嘴前端之樹脂，澆道襯套64 的噴嘴孔側的注入孔64a的直徑必須比噴嘴孔的直徑更大 ’宜形成1.6mm以上的注入孔。第9圖至第13圖係顯示 出，使用能取出2個導光板P (對角尺寸2.8吋、板厚 〇· 4mm)之導光板的射出壓縮成形裝置進行測試的結果， 其測試條件爲：用來冷卻模穴形成面5 5 a、62a之冷卻媒 體通路59、69的冷卻水溫度各90°C，噴嘴溫度325 °C， 加熱筒前部溫度3 5 5。(：，加熱筒中部溫度37〇°C，加熱筒 後部溫度36(TC，射出速度3 00mm/sec。 -15- 200842022 (13) 第9圖係顯示，使用注入孔64a的直徑1.6mm、第8 圖中放大顯示之錐角0爲Γ、長度25mm的澆道襯套64 時之數據。在本例，當澆道襯套64之冷卻溫度爲70 °C、 8 〇°C的情形，當成形循環時間變長（5秒以上）時澆道襯 套64之注入孔64a及噴嘴之噴嘴孔過度冷卻而發生下一 ' 個射出無法進行、成形品中混入冷料塊等的問題。當澆道 襯套6 4的冷卻溫度爲9 0 °C的情形，在6秒以上時也會發 φ 生不良。因此，澆道襯套64之注入孔64a的直徑爲 1.6mm時，其實用範圍變得極窄，當其數値更小時，直徑 更小時將無法進行符合實用之設定調整。 第10圖係顯示，使用注入孔64a的直徑2.0mm、第 8圖所示之錐角0爲1°、長度25mm的徺道襯套64時之 數據。本例中，各冷卻溫度的情形，當成形循環時間爲2 秒時，可能會發生澆道P1之冷卻跟不上、澆道切斷的情 形，但除此之外的結果良好。然而當成形循環時間超過一 • 定以上時經濟性不佳。又當成形循環時間過度延長時會發 生：噴嘴被冷卻而使熔融樹脂的流動性變差、加熱筒內之 _ 熔融樹脂的滯留時間過長而造成樹脂劣化（黃變、黑點） 等的問題。關於冷卻水的溫度，在40 °C的情形，由於成 形品中會混入冷料塊，故成形採用之冷卻溫度宜爲5 0 °C 以上。又在120 °C的情形，在4秒時會發生澆道切斷，因 此成形採用之冷卻溫度宜爲1 1 〇 °C以下。 第1 1圖係顯示，使用注入孔64 a的直徑2 · 3 mm、第 8圖所示之錐角0爲1°、長度25 mm的澆道襯套64時之 -16- 200842022 (14) 數據。在本例，當冷卻溫度爲70°C的情形，在成形循環 時間3秒時會發生澆道切斷，在冷卻溫度80 °C、90 °C的 情形，在成形循環時間5秒時會發生澆道切斷。 第12圖係顯示，使用注入孔64a的直徑2.6mm、第 8圖所示之錐角Θ爲Γ、長度25 mm的澆道襯套64時之 數據。在本例，由於流道連接部64c之直徑爲3.47mm， 該部分的冷卻硬化很耗時間。在本例，當冷卻溫度爲70 °C的情形，在成形循環時間5秒時會發生澆道切斷和牽絲 ，在冷卻溫度80 °C、90 °C的情形，在成形循環時間6秒 時也會發生澆道切斷。因此，當注入孔64a的直徑爲 2.6mm的情形，爲了達成理想成形循環時間之6秒以內的 情形，其可說是上限的直徑。 第14圖係顯示，使用注入孔 64a的直徑分別爲 1.6mm、2.0mm、2.3mm、2.6mm，錐角 0 爲 1·5°、長度 25mm的澆道襯套64時，以冷卻溫度7 0 °C進行測試時之 數據。在本例，流道連接部64c之直徑，分別對應於前述 注入孔尺寸而形成2.9mm、3.3mm、3.6mm、3.9mm，此最 厚的部分之冷卻硬化特別會發生過慢的問題。在注入孔 64a的直徑2.6mm、流道連接部64c直徑3.9mm、錐角0 爲1.5°的例子，在冷卻溫度70°C的情形，在成形循環時 間5秒時會發生澆道切斷，在6秒時會發生澆道之伸長或 彎曲，因此判斷成不符實用。又關於其他注入孔6 4a之直 徑尺寸，相較於澆道襯套6 4的內孔6 4 b之錐角Θ爲1 °的 情形，若不將最短的成形循環時間予以延長則會發生成形 -17- 200842022 (15) 不良。因此，在成形循環時間限定爲6秒以內的情形’冷 卻最慢的澆道襯套64 (具有內孔64b )之流道連接部64c 的直徑3.6mm，乃實用範圍最大的直徑。 因此在本實施形態，在用來冷卻可動模具2 0的模穴 _ 形成面55a之模穴用冷卻媒體流路59、用來冷卻流道形 成面57附近及突出銷56之冷卻媒體流路60、用來冷卻 固定模具16的模穴形成面62a之模穴用冷卻媒體流路69 φ 、用來冷卻流道形成面67及澆道襯套64等之澆道用冷卻 媒體流路70中，係流過被調溫器控制成50〜11〇 °C左右 (比成形用的樹脂之聚碳酸酯之玻璃轉化溫度Tg低40〜 1 00°c )之冷卻媒體（冷卻水）。澆道用冷卻媒體流路70 中之冷卻媒體溫度比其他流路爲低，如此可促進冷卻最耗 時間之澆道p 1的冷卻，而防止牽絲之發生。 此外，加熱筒1 2a之前部區域（最接近噴嘴的區域） 的溫度設定爲340°C，並對聚碳酸酯之熔融樹脂進行計量 φ 。在使用聚碳酸酯時前述加熱筒1 2 a之前部區域的溫度設 定，宜將溫度設定爲高溫之330〜380 °C。藉由作動合模 汽缸22 (開閉模及合模機構），使組裝於可動盤2 1之可 動模具20抵接在組裝於固定盤1 7之固定模具1 6，以進 _ 行閉模。接著將合模力昇高至50〜200kN以進行合模。 藉此，抵抗彈簧54a的彈壓力而使可動模具20之模具本 體部52和可動框部54抵接，使可動框部54相對於模芯 部5 3位於最後退的位置。又在固定模具1 6和可動模具 20之間，形成有流道P2 (包含厚度可變的澆口 P3 )以及 -18- 200842022 (16) 連接於該澆口 P3之厚度可變的模穴Cl、C2。這時，基於 使模穴C 1、C2內的熔融樹脂流動之觀點，較佳爲對模穴 Cl、C2內的空氣進行吸引。又在本實施形態，未圖示之 射出裝置之噴嘴係持續抵接於澆道襯套64，以縮短成形 * 循環時間。 • 接著當經過既定的遲延時間後，從未圖示之射出裝置 13的噴嘴12b經由澆道襯套64以100〜400mm/sec的射 φ 出速度射出熔融樹脂。可動盤21及可動模具20之模芯部200842022 (1) IX. DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a method of forming a light guide plate for forming a light guide plate in a mold by injection molding (including injection compression molding), particularly regarding a mobile phone A method of forming a light guide plate having a diagonal size of 7 吋 or less. φ [Prior Art] A method of forming and removing a light guide plate by injection molding (including injection compression molding) has been described in Patent Document 1. Patent Document 1 relates to the molding of a large-sized light guide plate. Usually, when molding a large-sized light guide plate, it takes only 30 seconds or more for the molding time (the time until the mold is opened after the mold is closed). In the take-out method described in Patent Document 1, since the light guide plate is taken out from between the two tie bars on the upper side and moved to another loading position, a problem arises in shortening the molding cycle time. # Further, in Patent Document 1, the primary molding cycle time is 40 seconds or longer. Further, in the molding cycle time of the small light guide plate, it takes a long time to perform the transfer of the pattern, and it takes time to take it out. Usually, the molding cycle time of one time must be 15 seconds or more. A problem occurs in shortening the forming cycle time. [Patent Document 1] Japanese Laid-Open Patent Publication No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. It is an object of the invention to provide a method for forming a light guide plate. When the light guide plate is formed by injection molding including injection compression molding, the molding time and the take-out time of the light guide plate can be shortened, thereby shortening the molding cycle time. . The method of forming a light guide plate according to claim 1 of the present invention is a method of forming a light guide plate in which a light guide plate is formed in a mold by injection molding, characterized in that the self-closing mold is completed and the emission is started. The mold is opened at a time of φ 1.75 to 6 seconds, and the time from the start of the mold opening to the removal of the light guide plate to the completion of the mold closing is performed within a period of 0.75 to 2.2 seconds. According to the present invention, the method of forming the light guide plate for forming the light guide plate in the mold by injection molding is performed within 6 seconds after the self-closing mold is completed, and the mold opening is started. Since the light guide plate is completed within 2.2 seconds from the completion of the mold closing, it is possible to shorten the molding cycle time which was unexpected in the past. [Embodiment] The injection compression molding die of the light guide plate of the present invention will be described with reference to Figs. 1 to 13 . Fig. 1 is a front view of the take-out device of the light guide plate of the embodiment as seen from the movable disk side toward the fixed disk side. Fig. 2 is a side view of the take-out device of the light guide plate of the present embodiment. Fig. 3 is an enlarged perspective view showing the main part of the light-receiving device of the embodiment. Fig. 4 is a cross-sectional view showing the injection compression molding die of the light guide plate used in the embodiment. Figs. 5 to 7 are views showing a flow chart of the injection compression molding method of the light guide plate of the embodiment. Fig. 8 is an injection compression molding of the light guide plate of the present embodiment -5- 200842022 (3) An enlarged cross-sectional view of a sprue bush of a mold. Figs. 9 to 13 show the relationship between the gate shape and the ring time of the injection molding die of the light guide plate. The light guide plate p of the present embodiment is formed by injection molding into injection molding. The injection compression molding can change the movable mold and the fixed mold during the formation and the end of the molding. Therefore, after the molten resin is ejected at the stop position after the mold is closed, the so-called "injection molding" form in which the Φ is advanced and compressed is also compression-molded. In the case where the injection compression molding is slightly opened before the start of injection or after the start of injection, the injection device having a high-speed injection capability can melt the resin at a relatively low speed. Further, after the start of the injection, the movable mold is moved to compress the molten resin, so that the flow of the molten resin is accelerated farther from the gate portion of the cavity, so that the fine pattern is satisfactorily cut off after the gate is formed. In the injection molding die, the pressure holding can not be performed, but in the case of injection compression molding, the molding resin can be compressed to correspond to the shrinkage caused by the cooling hardening. This shrinkage is particularly suitable for the formation of a light guide plate having a thin plate thickness (compared to the light exit face). As shown in Fig. 1 and Fig. 2, in the injection compression molding, a heating cylinder 12a (with a screw), a nozzle 12b, and a mold clamping device 14 are provided, which are disposed on the machine tool 15. The clamping device is fixed to the fixed plate 17 of the machine tool 15 (with a fixed mold 1 < between the pressure plate 18 of the machine tool 15 and 4 tie rods 1 ) The distance of the starting time is such that the movable mold belongs to the injection, and the position can be transferred without using the low pressure to move the direction of the injection mold, and the area of the injection pressure of the molten material in the injection hole is several 1 1, and the device 13 14 is discharged. , tied in) and assigned. Mounted -6 - 200842022 (4) The movable plate 21 of the movable mold 20 is movably assembled to the aforementioned tie rods 19. A clamping cylinder 22 (opening and closing mold and clamping mechanism) for opening and closing the mold and clamping is disposed on the pressure receiving plate 18, and the punching cylinder 22a of the clamping cylinder 22 is fixed to the back surface of the movable disk 21. . In the mold clamping cylinder 22 of the present embodiment, the pressure feed oil is sent to the assist cylinder (the cross-sectional area is small) by the control of the servo valve, so that the movable disk can be closed at a high speed. At the time of mold opening, the pressure feed oil is sent to the mold opening side oil chamber (small cross-sectional area) by the control of the servo valve, and the mold can be opened at a high speed. In the present embodiment, the highest specification is that the mold can be opened and closed in 0. 3 seconds on the mold closing side. In the opening and closing mold and the mold clamping mechanism of the present embodiment, the mold clamping cylinder 22 controlled by the servo valve is used, but a timing mechanism including a servo motor (which is excellent in starting rotational driving speed and stopping speed) and a ball screw can be used. . The aforementioned speed can also be achieved at this time. Next, a take-out device for taking out the formed light guide plate 从 from the injection molding die 51 of the injection compression molding machine 1 will be described. As shown in Fig. 1 and Fig. 2, the take-out device includes a first take-up device 23 that is fixed to the upper surface of the opposite side of the fixed disk I (opposite side of the operation panel), and is provided on the bracket 25 (fixed in The second take-up device 24 on the machine side 1 5) on the reverse side. The first take-out device 23 is provided with a rotary shaft 26 that extends in the mold opening and closing direction, and an arm portion 27 is fixed in a direction orthogonal to the rotary shaft 26. The rotary shaft 26 is moved forward and backward in the axial direction (opening and closing mold direction) by a first servo motor and a ball screw mechanism (not shown), and is rotated by a second servo motor (not shown), thereby achieving high precision. Perform high-speed operation and emergency stop. Therefore, the first take-out device 23 is also referred to as a rocker type take-out device. The arm portion 27 of the first take-out device 23 for directly taking out the light guide plate P or the like from the movable mold 20 of 200842022 (5) has a predetermined thickness, and is in the order of approaching the rotating shaft 26, and is composed of the first member 27a (toward the rotating shaft) The second member 27b (connected to the first member 27a in the oblique direction) and the third member 27c (connected to the second member 27b and to the first member 27a are vertically oriented) It is configured to be a substantially L-shaped arm member composed of three members. The third member 27c is bent inward so as to face the vicinity of the cavity φ of the movable mold 20. The shape of the arm portion 27 may be other shapes such as a right angle shape or an arc shape formed on both sides in a range not to interfere with the tie rod 19, the safety door, or the like. The arm portion of the first take-out device of the present embodiment is formed of carbon to achieve weight reduction. It is also possible to form the arm portion from a material such as aluminum which is lighter than iron. The body part containing the motor part has a weight of 1 5 to 2 5 kg and is therefore of a low inertia configuration. The servo motor of the drive source is a motor that starts the rotational drive speed and the stop speed. Therefore, after the open mode signal is input, the arm movement time from the standby position φ to the position of the loading position is only 0.04 seconds, the suction take-out time 〇· 〇 7 seconds, and the arm movement time from the start of the unloading rotation to the rotation stop is 0.04 seconds' That is, the fastest specification of the first take-out device is a total of 〇.15 seconds to output the open mode signal. It takes the same amount of time to take out two 7-inch light guide plates. The time taken for the first take-out device to take out, regardless of whether the light guide plate is not easily released from the cavity or the adhesion of the adsorption holding portion is likely to adhere, the time is not longer than 1 · leap seconds. As shown in Fig. 3, the third member 27c' of the arm portion 27 of the second extraction device 23 has a plate shape -8-200842022 (6) having a side surface of the fixed mold and a side surface of the movable mold, and is formed toward the base side at the front end side. The v-groove 28' forms branch portions 29a, 29b on both sides of the V-groove 28. A chuck 30 is disposed in the inner space portion of the V-groove 28. The chuck 30 is opened and closed by the electromagnetic actuator 30a (the surface on the fixed mold side of the base portion side of the joint portion of the branch portions 2 9 a and 2 9 b). Actuate to carry out the sprue P1 holding or releasing. A reflective detector 31 is disposed on the movable mold side surface in the vicinity of the joint portion of the branch portions 29a and 29b. The detector 3 1 φ detects whether or not the runner P 1 is held, and when the holding state of the runner P1 is abnormal, the opening and closing mold and the mold clamping mechanism are stopped. The mounting plate 32 is disposed in the vertical direction with respect to the third member 27c of the arm portion 27. The length from the upper portion to the lower portion of the mounting plate 32 (upper or lower than the third member 27c) coincides with the longitudinal direction of the light guide plate P to be formed. On the surface of the mounting plate 32 on the movable mold 20 side, the adsorption holding portion for adsorbing the light guide plate P is fixed to each of the upper portion and the lower portion of the mounting plate 32 so as to face the movable mold 20 side. 3 3 φ . The adsorption holding unit 3 3 includes a cup portion 34 of a porous elastic material (sponge), a bobbin-shaped spring portion 35 for attaching the cup portion 34 to the attachment plate 32, a pipe 36, and the like. As the cup portion 34, an elastomer excellent in heat resistance such as porous tantalum rubber or porous fluororubber is preferably used. The cup portion 34 has a disk portion 34b having a thickness of about 5 mm (including an adsorption surface 34a having a diameter of 8 to 16 mm), a V-shaped constricted portion 34c located at the rear side thereof, and a base portion 34d located further rearward. The base portion 34d is fixed to the bobbin-shaped spring portion 35, and the other side of the spring portion 35 is fixed to the mounting plate 32. The adsorption surface 34 4 a is formed with a hole of about 1 mm in diameter at the center of the hole. The hole is formed by a hole of a thickness of about 1 mm, and a fine hole is formed in the periphery, and the whole is flat. The suction hole 34e penetrates the disk portion 34b, the constricted portion 34c, and the substrate 34d in the axial direction, and a pipe 36 made of a flexible resin is connected to the opening of the suction hole 34e on the side of the base portion 34d. The pipe 36 is fixed to the arm portion 27 so as to extend inside the spring portion 35, and is "into a vacuum device (not shown). A second take-up device 24, which is a biaxial transfer robot, is provided on a bracket 25 fixed to the side of the machine tool cymbal 5 on the counter-operating disk side of the injection compression molding machine 1 The first rotating shaft 37 that is rotatably driven in a direction parallel to the opening and closing mold direction of the injection compression molding machine 1 is disposed so as to be fixed to the fixed shaft 38 (fixed to the first rotating shaft 37) The second rotation axis 39 that is rotated in the vertical direction). The first rotating shaft 37 and the second rotating shaft 39 are rotationally driven by a third servo motor and a fourth servo motor (not shown), so that high-speed operation and emergency stop can be performed with high precision. • The arm portion 40 is fixed to the distal end of the second rotating shaft 39. The arm portion 40 has a predetermined thickness and is in the order of being close to the second rotating shaft 39. The first member 40a that is coaxial with the second rotating shaft 39 is at a predetermined angle with respect to the first member 40a. In the present embodiment, the second member 40b which is inclined to the injection molding machine side by about 60 in the upright direction is inclined. The second take-out device 24 can be stopped at a predetermined position, and the arrangement direction of the suction holding portion 33 of the delivery position (release position) A2 of the first take-up device 23 and the delivery position (standby position) B1 of the second take-up device 24 can be stopped. The directions of the second members 40b are the same. -10- 200842022 (8) The adsorption holding portion 41 is disposed on the surface of the second member 40b of the arm portion 40 on the side of the fixed mold 16 so as to be spaced apart from the first extraction device 23 at the same interval. The adsorption holding portion 41 of the second take-out device 24 is a general suction cup having a rubber mat. The adsorption holding portion 41 is attached to the arm portion 40 via a spring, and a flexible resin pipe (not shown) is connected to the suction hole of the suction cup. Further, the resin piping is fixed to the arm portion 40 by the inside of the spring, and is introduced into a vacuum device (not shown), which is the same as the first take-out device 23. A belt conveyor is disposed at a position lower than the first rotating shaft 37 of the second take-up device 24 on the floor opposite to the injection molding machine 11 (reverse operation side) via the second take-up device 24. 42. The belt conveyor 42 is of a general type, and the rubber belt 43 of a predetermined width is intermittently driven by a motor (not shown). As shown in Fig. 1 and Fig. 2, on the side of the machine tool 15 on the opposite side of the injection compression molding machine 11, a funnel-shaped chute 44 that is open above is disposed on the side of the injection device 13 of the second take-up device 24. The chute 44 is disposed below the delivery position (release position) A2 of the first take-up device 23, and collects the runner P1 when the first take-up device 23 releases the runner P1 (as a receiving member). In the first and second figures, the entire pipe (not omitted) is not described in the pipe 45 below the chute 44, and the following design is adopted: the runner P1 is dropped to a collecting box (not shown); Alternatively, the pipe is connected to the upper portion of the injection device, and the runner P1 is conveyed by means of air or the like, and is taken in from the inlet of the injection device to be collected and used. In the moving area of the take-out devices 23 and 24 and the moving area -11 - 200842022 (9) of the movable mold 20, a safety door, a guard grill, and the like are provided, and the illustration thereof is omitted here. Next, the injection compression molding die 51 of the light guide plate of the present embodiment will be described with reference to Fig. 4. The injection compression molding mold 51 is composed of a movable mold 20 of a first mold and a fixed mold 16 of a second mold, and a mold having a variable volume and a thickness is formed between the two molds 20 and 16 after the mold clamping. Holes C1, C2 (for injection compression molding or injection molding). The movable mold 20 includes a mold main body portion 52, a core portion 53, a movable frame portion 54, and the like φ. The core portion 53 is fixed to the mold main body portion 52, and the movable frame portion 54 provided around the mold body portion 54 is attached to the mold main body portion 52 by a spring 54a. Therefore, in the movable frame portion 20, the relative positions of the core portion 53 and the movable frame portion 54 in the direction of the opening and closing mold can be changed. In the core portion 5 3, two cavity forming blocks 55, 55 are fixed, and in the cavity forming blocks 55, 55, cavity forming faces 5 5a, 5 5 a ° are formed in the mold body portion 52 and the core portion, respectively. A position of the center portion of the 53 opposite to the sprue bushing 64 of the fixed mold 16 is provided with a projecting pin φ 56 of the ejector (moving forward by a driving device (not shown) and retracting by a spring). On the front end surface of the above-mentioned protruding pin 56, a biting portion 56a for pulling the runner P1 toward the side of the movable mold 20 is provided. A flow path forming surface 57 (for forming the flow path P2) is formed from the nip portion 56a toward each of the cavity forming faces 55a. In the movable mold 20, a gate cutting tool 58 is disposed adjacent to the cavity forming block 55 (moving forward by a driving device (not shown) and retracting by a spring). When the gate cutting tool 58 advances, the gate P3 can be cut by interlacing with the fixed gate cutting tool 65 of the fixed mold 16. Two flow paths are provided in the movable mold 20, that is, a cooling medium flow path 59 for cooling the cavity forming surface -12-200842022 (10) 55a for cooling the flow path formation 57 And a cooling medium flow path 60 such as a pin 56 or the like. The fixed mold 16 of the second mold includes a mold main body portion 61, a cavity forming block 62 on which the cavity forming surface 62a is formed, a molding block 63, a sprue bushing 64, a fixed gate cutting tool 65, and an abutting block. 66 and so on. The bypass bushing 64* is a passage when the molten resin is ejected from the nozzle 12b, and the surface of the insert 63 constitutes the flow path forming surface 67. The fixed gate cutter 65 is disposed adjacent to the die formation block 62 and can be interleaved with the gate cutter 58. Two systems of flow paths are provided in the fixed mold 16, that is, a cavity cooling medium flow path 69 for cooling the cavity forming surface 62a, a cooling flow path forming surface 67, and a sprue bushing 64. The runners are used for the cooling medium flow path 70; they are of the cold runner (including runner) type. In the present embodiment, two cavities C1 and C2 are disposed in the longitudinal direction in the injection compression molding die 51. However, two cavities can be formed in the horizontal direction, and the number of cavities can be, for example, one or four. Wait for the plural. The number and arrangement of the φ adsorption holding portions of the take-up device are determined in accordance with the number and arrangement of the aforementioned cavities. Next, the injection compression molding method of the light guide plate P of the compression molding machine 11 of the present embodiment will be described using the flowchart of Fig. 5. In the present embodiment, the light guide plate P having a diagonal size of 3 Å and a thickness of 0.4 mm was formed by a molding cycle time of 4.4 seconds. Among them, the mold opening time was 0.5 seconds, the take-out time was 0.4 seconds, and the mold closing time was 0.5 seconds. The time from the start of the mold opening to the completion of the mold closing to the mold closing time was 1.4 seconds. Further, the time from the start of the mold opening to the removal of the light guide plate to the completion of the mold closing is preferably within 2 · 2 seconds (0.75 to 2 · 2 seconds), more preferably within 1.5 seconds (0.75 to 1.5 seconds).前-13- 200842022 (11) The fastest 〇·75 seconds from the start of mold opening to the completion of mold closing, the servo mechanism (opening and closing mold and clamping mechanism) and servo motor are used as described above. The shortest time that can be achieved by the rocking type take-out device. Further, from the start of the mold opening, the light guide plate P is taken out to the time when the mold closing is completed, which is the slowest of 2.2 seconds. At this time, as described later, both the mold opening and the closing mold are 〇·6 seconds, and the time between the removal and the closing is 1. The time taken for the withdrawal time of leap seconds refers to the case where the air ejection speed is very slow, or the extremely low speed is used to abut against the formed light guide plate to avoid the occurrence of the retention marks on the light guide plate. If the mold opening and closing time is further extended, not only the molding cycle time is increased, but the production efficiency is deteriorated, and the residence time of the molten resin in the heating cylinder of the injection device becomes too long, and the nozzle is cooled to generate a cold block (cold slug). ). The time from the closing of the mold to the start of the mold opening is 3 · 0 seconds, wherein the injection delay time (pressurization time) 〇 · 1 second, the injection time is 0.05 seconds, the pressure holding time is 0.45 seconds, and the cooling time is 2.4 seconds ( Substantial cooling is performed only after the start of the injection). However, the time from the completion of the mold closing to the start of mold opening is changed in the range of 1.75 to 6 seconds depending on the shape (area, thickness, and transfer surface shape) of the Φ light guide plate, in order to further shorten the forming. The cycle time should be controlled within 4 seconds (1 · 7 5~4 · 0 seconds). If the size of the light guide plate is within this range, the molding cycle time will not be affected. However, if the molding cycle time is further shortened, the cooling time of the runner Ρ1 is insufficient and the hardening is insufficient, and the sprue Ρ1 cannot be taken out. The problem. Fig. 6 and Fig. 7 are flowcharts showing the method of injection compression molding of the light guide plate of the embodiment, Fig. 6 shows an example of a molding cycle time of 2.5 seconds, and Fig. 7 shows an example of a molding cycle time of 6 seconds.成-14- 200842022 (12) In the case of a cycle time of 2.5 seconds, as shown in the flow chart of the injection compression molding method of the light guide plate of Fig. 6, the opening and closing mode time (including the take-out time and the intermediate time) is 0.75 seconds. The injection delay time (boost time) 〇.1 second, the injection time 0.05 seconds, the dwell time 0.4 seconds, and the cooling time 1.2 seconds (from the completion of the closed mold to the mold opening 1.75 seconds). As long as the size of the light guide plate is within this range, the molding cycle time is less affected, but if the molding cycle time is further shortened, the runner Ρ1 (the thickest thickness) will be insufficiently hardened, and the runner ρ1 cannot be extracted. Etc. As shown in Fig. 7, a light guide plate having a transfer pattern of a diagonal size of 3 Å and a plate thickness of 0 · 6 mm (uniform plate thickness) can be formed by injection compression molding at a molding cycle time of 6.00 seconds. The cooling time at this time was 3.9 seconds. As described above, the most influential factor for determining the cooling time in the molding cycle time of the present invention is the diameter and the taper angle (release angle) of the sprue 1 shown in Fig. 8. In the present embodiment, the nozzle hole (not shown) of the nozzle of the injection device has a diameter of 1.5 mm. When the sprue is demolded, in order to remove the resin at the tip end of the nozzle well, the diameter of the injection hole 64a on the nozzle hole side of the sprue bushing 64 must be larger than the diameter of the nozzle hole, and it is preferable to form an injection of 1.6 mm or more. hole. Fig. 9 to Fig. 13 show the results of testing using an injection compression molding apparatus capable of taking out two light guide plates P (diagonal size 2.8 吋, plate thickness 〇 4 mm), and the test conditions are as follows: The cooling medium passages 59, 69 for cooling the cavity forming faces 55a, 62a have a cooling water temperature of 90 ° C, a nozzle temperature of 325 ° C, and a front temperature of the heating cylinder of 35 5 . (: The temperature in the middle of the heating cylinder is 37 °C, and the temperature in the rear of the heating cylinder is 36 (TC, the injection speed is 300 mm/sec. -15- 200842022 (13) Figure 9 shows the diameter of the injection hole 64a is 1.6 mm, 8 The figure shows the data when the taper angle 0 is Γ and the length of the runner bush 64 is 25 mm. In this example, when the cooling temperature of the sprue bushing 64 is 70 °C, 8 〇 °C, when When the molding cycle time is long (5 seconds or more), the injection hole 64a of the sprue bushing 64 and the nozzle hole of the nozzle are excessively cooled, and the next injection cannot be performed, and the cold block is mixed in the molded product. When the cooling temperature of the channel bushing 64 is 90 ° C, the defect of φ is also caused when it is 6 seconds or longer. Therefore, when the diameter of the injection hole 64a of the sprue bushing 64 is 1.6 mm, the practical range thereof becomes It is extremely narrow, and when the number is smaller, the diameter is smaller, and it is impossible to perform the adjustment according to the practical setting. Fig. 10 shows that the diameter of the injection hole 64a is 2.0 mm, and the cone angle 0 shown in Fig. 8 is 1°. The data of the 25 mm length of the ramp bushing 64. In this example, for each cooling temperature, when the forming cycle time is 2 seconds The cooling of the runner P1 may not be followed, and the runner may be cut off, but the results are good. However, when the molding cycle time exceeds a certain limit, the economy is not good. Excessive elongation occurs when the nozzle is cooled to deteriorate the fluidity of the molten resin, and the residence time of the molten resin in the heating cylinder is too long to cause deterioration of the resin (yellowing, black spots). At 40 °C, the cooling temperature is preferably 50 ° C or more due to the mixing of the cold block in the molded product. In the case of 120 ° C, the sprue cut occurs at 4 seconds. Therefore, the cooling temperature for forming is preferably 1 1 〇 ° C or less. The first figure shows that the diameter of the injection hole 64 a is 2 · 3 mm, and the cone angle 0 shown in Fig. 8 is 1 ° and the length. 25 mm sprue bushing 64°-16-200842022 (14) Data. In this case, when the cooling temperature is 70 °C, sprue cutoff occurs at the forming cycle time of 3 seconds at the cooling temperature. At 80 °C, 90 °C, sprue cutting occurs at a molding cycle time of 5 seconds. Fig. 12 shows the data when the diameter of the injection hole 64a is 2.6 mm, and the runner bushing 64 having the taper angle 第 shown in Fig. 8 is Γ and the length is 25 mm. In this example, the flow path connecting portion is used. The diameter of 64c is 3.47mm, and the cooling and hardening of this part is time consuming. In this case, when the cooling temperature is 70 °C, sprue cutting and wire drawing occur at the molding cycle time of 5 seconds, at the cooling temperature. At 80 °C and 90 °C, sprue cuts also occur at 6 seconds of the forming cycle time. Therefore, when the diameter of the injection hole 64a is 2.6 mm, it can be said that it is the upper limit diameter in order to achieve the ideal molding cycle time within 6 seconds. Fig. 14 shows a cooling temperature of 70 0 when the diameter of the injection hole 64a is 1.6 mm, 2.0 mm, 2.3 mm, 2.6 mm, and the sprue angle 0 is 1.5 mm and the length is 25 mm. °C When testing data. In this example, the diameters of the flow path connecting portions 64c are respectively formed to be 2.9 mm, 3.3 mm, 3.6 mm, and 3.9 mm in accordance with the size of the above-mentioned injection holes, and the cooling hardening of the thickest portion particularly causes a problem of being too slow. In the case where the injection hole 64a has a diameter of 2.6 mm, the flow path connecting portion 64c has a diameter of 3.9 mm, and the taper angle 0 is 1.5°, at a cooling temperature of 70 ° C, sprue cutting occurs at a molding cycle time of 5 seconds. The elongation or bending of the runner occurs at 6 seconds, so it is judged to be inconsistent. Further, regarding the diameter of the other injection hole 640a, the taper angle Θ of the inner hole 624 of the sprue bushing 64 is 1°, and the molding is performed without extending the shortest molding cycle time. -17- 200842022 (15) Bad. Therefore, in the case where the molding cycle time is limited to 6 seconds or less, the diameter of the flow path connecting portion 64c of the runner bush 64 having the slowest cooling (having the inner hole 64b) is 3.6 mm, which is the diameter of the practical range. Therefore, in the present embodiment, the cavity cooling medium flow path 59 for cooling the cavity forming surface 55a of the movable mold 20, and the cooling medium flow path 60 for cooling the vicinity of the flow path forming surface 57 and the protruding pin 56 are provided. a cooling medium flow path 69 φ for cooling the cavity forming surface 62a of the fixed mold 16, and a cooling medium flow path 70 for cooling the runner forming surface 67 and the sprue bushing 64, It is a cooling medium (cooling water) which is controlled by a thermostat to be about 50 to 11 ° C (40 to 100 ° C lower than the glass transition temperature Tg of the polycarbonate for molding). The temperature of the cooling medium in the runner cooling channel 70 is lower than that of the other channels, which promotes cooling of the most time-consuming runner p1 and prevents the occurrence of the wire. Further, the temperature of the front region (the region closest to the nozzle) of the heating cylinder 12a was set to 340 ° C, and the molten resin of polycarbonate was measured φ . When the polycarbonate is used, the temperature of the front portion of the heating cylinder 1 2 a is set, and the temperature is preferably set to a high temperature of 330 to 380 °C. By moving the mold clamping cylinder 22 (opening and closing mold and clamping mechanism), the movable mold 20 assembled to the movable disk 21 is brought into contact with the fixed mold 16 assembled to the fixed disk 17 to be closed. Then, the mold clamping force was raised to 50 to 200 kN to perform mold clamping. Thereby, the mold main body portion 52 of the movable mold 20 and the movable frame portion 54 are brought into contact with each other against the elastic pressure of the spring 54a, and the movable frame portion 54 is positioned at the final position with respect to the core portion 53. Further, between the fixed mold 16 and the movable mold 20, a flow path P2 (including a gate P3 having a variable thickness) and -18-200842022 (16) a cavity C of variable thickness connected to the gate P3 are formed. , C2. At this time, it is preferable to attract the air in the cavities Cl and C2 from the viewpoint of flowing the molten resin in the cavities C1 and C2. Further, in the present embodiment, the nozzle of the injection device (not shown) is continuously abutted against the sprue bushing 64 to shorten the molding cycle time. Then, after a predetermined delay time elapses, the nozzle 12b of the injection device 13 (not shown) ejects the molten resin at a speed of 100 to 400 mm/sec through the sprue bushing 64. The core portion of the movable plate 21 and the movable mold 20
5 3等，受到射出時的壓力而再度後退。如此般，可動模 具20之可動框部54，係位於比模芯部53更前方的位置 ，固定模具16之模穴形成面62a和可動模具20的模穴形 成面5 5 a之間隔，相較於第1圖所示之最初合模力作用的 位置，係加寬最大爲50〜200 /z m。由於可動模具20之模 芯部53後退，熔融樹脂可射出至澆口 P3截面積變大之模 穴C1、C2內，而能減少熔融樹脂之流動損失。結果，能 φ 用較低速、低壓來射出熔融樹脂，特別是能抑制導光板P 的澆口附近發生內部應力。 當射出裝置1 3之螺桿位置到達既定的保壓切換位置 時，從射出控制切換成保壓控制。當切換成保壓控制後， ~ 合模汽缸22仍以高合模力進行合模，在切換成保壓控制 並經過一定時間後，減少合模力。也能在保壓切換之同時 減少合模力。在本實施形態，於降低合模力之大致同時， 藉由未圖示之驅動裝置，使澆口切斷具58前進0.4 5〜0.8 mm，以進行澆口 P3之切斷。這時，係使可動模具20之 -19- 200842022 (17) 澆口切斷具58和固定模具16之澆口切斷具65交錯，以 進行澆口 P3之切斷。又在進行澆口切斷時，當然澆口 P3 之熔融樹脂尙未到達完全硬化的狀態。 在藉由澆口切斷具58進行澆口 p3之切斷後，澆口切 斷具5 8保持於前進位置。如此般，雖變得無法從射出裝 置1 3側對模穴C 1、C2內之熔融樹脂進行完全地保壓， 但經由合模汽缸22之驅動而使可動模具20前進，可對模 φ 穴Cl、C2內之熔融樹脂進行壓縮，即使因冷卻而發生收 縮仍不致產生凹陷，而能進行良好的轉印成形。在這期間 ，在射出裝置13之加熱筒12a係進行下個成形所使用之 熔融樹脂的計量。在冷卻時間結束前，經由可動模具20 之可動框部5 4和模穴形成塊5 5間之空氣通路、固定模具 16之模穴形成塊62和嵌塊66間之空氣通路等，開始進 行朝向模穴Cl、C2之脫模用空氣的供應（噴吹空氣）。 接著作動合模汽缸22而依序進行排壓、開模。從保壓結 Φ 束至開始開模（包含排壓）爲止之冷卻時間，在本實施形 態爲2.4秒。 然後作動合模汽缸22，使可動盤2 1及可動模具20 移動而進行開模。在開始進行開模時，可動模具2 0之突 ' 出銷56前端之咬入部56a會咬入澆道P1 (包含流道P2) ，如此可將澆道P 1從固定模具1 6之澆道襯套64拔出。 又關於導光板P，藉由可動模具20的凹狀模具形狀，而 被保持於模穴形成面55a並以此狀態進行開模。因此，經 澆口切斷後之澆道P1 (包含流道P2 )和導光板P雙方以 -20- 200842022 (18) 分離的狀態被保持於可動模具2 0，並朝開模方向移動。 在開模的同時，在固定模具16停止噴吹脫模用空氣。在 本實施形態，從可動模具20開始進行開模至開模完成的 時間爲0 · 5秒，該開模時間可在〇 . 3〜0.6秒之間做改變。 又開模行程（大致等於開模完成時固定模具1 6和可動模 具20的間隔）爲60〜100mm。 當接收到開模完成所發出之開模完成訊號時，第1取 φ 出裝置23之旋轉軸26會朝第1圖之反時針方向旋轉，而 使臂部27和吸附保持部3 3等從待機位置A3移動並停止 於與開模後的可動模具20附近之導光板P相對向的位置 。接著，使前述旋轉軸26朝開模方向移動15〜30mm， 臂部27和吸附保持部33等移動至保持位置A1。藉此， 吸附保持部3 3的杯部3 4之吸附面3 4a各個，會抵接於導 光板P之反射面（藉由固定模具16之模穴形成面62a所 轉印成形出）。對第1取出裝置23的吸附保持部3 3進行 # 之空氣吸引，係在前述取出裝置23開始作動時就同時進 行，因此當吸附面3 4a抵接時會同時進行吸附。這時的吸 引力係採用-50--12〇kpa左右之較弱吸引力，以避免 在剛成形出的導光板P上形成痕跡。又由於吸附保持部 33的杯部34係由多孔質的彈性材料（海綿）所構成，吸 附面34a全體會吸附在導光板P上，如此更加能避免在導 光板P上形成痕跡。又在本實施形態，成形循環時間僅 4 ·4秒，成形出的導光板P之熱量會傳至杯部3 4而使其到 達一定以上的溫度，這點也是避免發生痕跡的要素之一。 -21 - 200842022 (19) 在第1取出裝置23移動至保持位置A1的同時，檢 測器3 1會進行以下檢測，亦即，從澆道襯套64拔取之澆 道P1是否正常地位在V槽28內側之夾頭30的夾頭構件 間。當檢測益31檢測出丨宪道pi時，藉由電磁式作動裝置 使夾頭30閉合，而用夾頭30把持澆道P1 (包含流道P2 ' )。當藉由吸附保持部3 3吸附住導光板P，且藉由夾頭 3 〇把持住澆道P1 (包含流道P 2 )時，第1取出裝置2 3 φ 之旋轉軸26及臂部27再度朝閉模方向稍微移動，而使導 光板P從模穴形成面5 5 a脫模，同時使澆道P1 (包含流 道P2)脫離突出銷56前端之咬入部56a。在前述第1取 出裝置23進行導光板P及澆道Pi (包含流道P2 )之脫模 期間，可動模具20同樣進行脫膜用空氣之供應，以輔助 導光板P等的成形。也能使可動模具之可動框部的一部分 向外打開，或使模穴形成面前進，以更容易進行導光板P 之取出。 • 接著，第1取出裝置23之旋轉軸26朝第1圖之順時 針旋轉，當臂部27搖動至二點鏈線所示的位置（第1取 出裝置23和第2取出裝置24在第1圖中重疊的位置）時 ，停止旋轉軸26之旋轉。然後，第1取出裝置23之旋轉 軸26再度朝開模方向移動，而使臂部27和吸附保持部 33等移動至交接位置（釋放位置）A2。在本實施形態， 從第1取出裝置23開始作動，將導光板P和澆道P1以分 離的狀態取出，再移動至交接位置（釋放位置）A2，總 共所須時間爲0.4秒，在這期間同樣進行導光板P之冷卻 -22- 200842022 (20) 第2取出裝置24之臂部40係停止而待機於第丨圖之 實線位置，以在交接位置（釋放位置）A2接收來自第1 取出裝置23之導光板P。又第2取出裝置24之吸附保持 部4 1，在抵接於導光板P之前已開始進行空氣吸引。相 較於第1取出裝置23之吸附保持部3 3，第2取出裝置24 之吸附保持部4 1係以更低真空度進行強力的空氣吸引。 接著第1取出裝置23朝開模方向移動，當導光板p之藉 由可動模具2 0之模穴形成面5 5 a所形成的面（本實施形 態爲光出射面）藉由第2取出裝置24之吸附保持部41抵 接而進行吸附時，在第1取出裝置23之吸附保持部3 3停 止進行空氣吸附，馬上使第1取出裝置2 3後退，而由第 2取出裝置24接收導光板P。 在交接位置（釋放位置）A 2，夾頭3 0打開，而使第 1取出裝置23之夾頭30所把持之澆道P1 (包含流道P2 )落到下方之滑槽4 4內。打開夾頭3 0使僥道p 1落下的 動作，雖可在澆道p 1交接的同時進行，但澆道p 1落下可 能會接觸導光板P的情形，可在導光板P從第1取出裝置 23交接至第2取出裝置24且第1取出裝置23朝閉模方 向後退之後，再進行該動作。當導光板P交接至第2取出 裝置24且澆道P1落下後，第1取出裝置23之臂部27移 動至第1圖之一點鏈線所示之待機位置A3。待機位置A3 ’在不干涉可動模具20之移動區域且不受模具的熱影響 等之範圍內，越靠近可動模具2 0等的位置越有助於縮短 -23- 200842022 (21) 成形循環時間。 當第1取出裝置23交接導光板P時，在其後退之同 時，第2取出裝置24之第1旋轉軸37會朝第1圖之反時 針方向旋轉，使固定於第1旋轉軸3 7的垂直方向上之固 定軸38搖動，在此同時，安裝於固定軸38之第2旋轉軸 39也旋轉90°，伴隨前述第2旋轉軸39之旋轉，相對於 臂部40之第1構件40 a呈傾斜設置之第2構件40b也旋 0 轉90°，而使吸附保持部4 1和其所保持之導光板P面向下 方。又當臂部40搖動至第1圖之二點鏈線所示之釋放位 置B2時，第1旋轉軸37停止旋轉且臂部40停止搖動。 接著停止對吸附保持部41進行空氣吸引，以反射面向下 的方式釋放導光板P，使其落到帶式輸送機42之橡膠皮 帶43上。在本實施形態，雖是在與橡膠皮帶43的移動方 向正交的方向上使兩片導光板P落下，但由於以極短距離 落至橡膠皮帶43上方，並不會造成導光板P損傷。 φ 釋放導光板P後之第2取出裝置24，以和前述相反 的方式使第1旋轉軸3 7及第2旋轉軸3 0旋轉，而再度返 回交接位置（待機位置）B1。以能裝載下個導光板P之 方式，將帶式輸送機42實施間歇驅動，而使橡膠皮帶43 - 以一定距離向前進給。在橡膠皮帶43上，繼續進行導光 板P之冷卻，之後用人工或機器人進行捆包作業。 第1取出裝置23和第2取出裝置24，係由配設於射 出壓縮成形機1 1內之未圖示的取出裝置用控制器所控制 。前述取出裝置用控制器，係連接於未圖示之射出壓縮成 -24- 200842022 (22) 形機11的控制器。因此，接收來自射出壓縮成形機11之 開始開模訊號而進行第1取出裝置23之空氣吸引，接收 開模完成訊號而使第1取出裝置2 3之臂部27開始旋轉。 又按照第1取出裝置23之臂部27的動作，開始進行第2 取出裝置24之空氣吸引和臂部40的動作。當第1取出裝 • 置23移動至可動模具20外部之交接位置（釋放位置） A2後，發出開始閉模訊號而進行閉模動作。在本實施形 φ 態，從可動模具20之開始閉模至閉模完成時間爲0.5秒 ，該閉模時間可在0.3〜0.6秒的範圍內調整。例如，基 於射出壓縮成形機1 1、射出壓縮成形模具5 1之耐久壽命 、計量安定性等的觀點，有時不一定要追求最高速的開模 速度、閉模速度。 在本實施形態，取出裝置23、24係採用搖臂式，使 2台取出裝置23、24在交接位置進行導光板P之交接， 如此設計的理由主要爲縮短循環時間。在本實施形態’取 φ 出裝置取出導光板P所須的時間（從開模完成且第1取出 裝置2 3之臂部2 7位於待機位置A3開始動作，經由在保 持位置A1取出導光板P，離開可動模具2 0之移動區域到 達交接位置（釋放位置）A2的時間）爲0 · 4秒。前述時 間可爲0 · 1 5〜1 · 0秒的範圍’當希望縮短成形循環時間的 情形，能在〇 · 1 5〜0 · 4秒的範圍內進行。爲了進一步避免 吸附保持部3 3之痕跡附著在成形後高溫之導光板p上’ 可降低吸附保持部3 3之抵接速度’或等到可動模具2 0噴 吹出更多的脫模用空氣（噴吹空氣）’但在這時較佳爲， -25- 200842022 (23) 所須時間最多延長到1.0秒左右。 此外，藉由使可動模具20之開閉模動作和取出裝置 23的動作有一部分重疊，可進一步將成形循環時間縮短 0.3〜0.5秒左右。例如，在撿測出移動至開模即將完成前 的位置之可動模具20時，使取出裝置23之臂部27動作 ，藉此使開模動作和臂部27之侵入動作重疊，以縮短成 形循環時間。另外，藉由極限開關等檢測出臂部27和吸 φ 附保持部33等已從可動模具20之可動區域移動至外部， 在其到達交接位置A2之前發出開始閉模訊號，藉此使閉 模動作和臂部27之退出動作重疊，亦可縮短成形循環時 間。 關於本發明，雖未逐一列舉，但並不限於上述實施形 態’當然也包括熟習此技藝人士根據本發明的要旨所做的 改變。關於搖臂式之第1取出裝置，只要至少能使臂部搖 動者即可，亦可計設成：臂部整體不會朝開閉模方向移動 φ ，而僅臂部前端之吸附保持部朝開閉模方向移動。也能設 計成：第1取出裝置不會朝開閉模方向移動，第2取出裝 置可在開閉模方向移動以進行交接，這時，爲了使來自模 具之導光板吸附於第1取出裝置，可在模具另外設置構機 ’ ，或使可動盤稍微前進。又關於第1取出裝置及第2取出 裝置之裝載位置，可在機床、固定盤上、地板之裝載台上 等做選擇。又在本發明，係藉由第1取出裝置，在模具外 部之釋放位置將導光板和澆道以分離的狀態取出，因此第 2取出裝置並非必須。例如可設計成，在搖臂式之第1取 -26- 200842022 (24) 出裝置之臂部進一步增加旋轉軸，在釋放位置使導光板呈 水平狀態，以直接釋放並裝載於輸送機上。關於第1取出 裝置之吸附保持部，可採用通常的橡膠墊或複數段的伸縮 囊型（bellows type )，材質可採用聚氨酯橡膠、丁腈橡 膠等等，並沒有特別的限定。關於取出裝置，也能採用沿 ‘ 水平方向移動於可動模具附近之保持位置和模具外部的釋 放位置間之水平移動式的取出裝置。這時，取出所須時間 φ 爲0.8〜2.2秒。關於水平移動式的取出裝置，係設有： 用來吸附導光板之吸附保持部、用來把持澆道之夾頭，且 將導光板和澆道以分離的狀態取出。吸附保持部宜使用矽 橡膠等的多孔質彈性材料。 又在本實施形態，雖是針對對角尺寸3吋之行動電話 用的導光板之射出壓縮成形模具作說明，但導光板之尺寸 可爲1.5吋以上7吋以下的範圍（換算成面積爲7.5 cm2 以上150cm2以下。也包含四隅沒有角部但在前述面積範 % 圍內者）。又所使用之模具，可成形出對角尺寸5吋以下 的導光板複數個，或成形出對角尺寸6〜7吋的導光板1 個。關於導光板的形狀，除板厚均一之導光板以外，也包 括：板厚從光入射面側朝另一側越來越薄之楔型導光板， * 能使背光等的光源透過之光擴散板、透鏡等等。又關於導 光板之成形所使用之樹脂，雖僅記載聚碳酸酯（例如出光 興產之達夫隆LC 1 500 )的例子，但只要光學性能優異即 可，例如可使用甲基丙烯酸樹脂、環烯烴聚合物樹脂等等 。由於依樹脂的種類，熔融樹脂之溫度及玻璃轉化溫度會 -27- 200842022 (25) 有不同，當然澆口切斷之時點、冷卻媒體之溫度、成形循 環時間等等也會有所不同。 又本實施形態之導光板P，由於板厚0.4mm而採用射 出壓縮成形方法，但在板厚0.2〜0.4mm左右的情形，可 使用射出模壓方法。射出模壓方法，在閉模位置最初形成 •模穴之間隔寬廣的狀態，而由低合模力或合模力接近0的 狀態進行增壓，因此即使板厚極薄的情形仍能以較低速低 φ 壓來進行射出。第14圖之顯示導光板的射出模壓方法之 流程圖，係以4.2秒的成形循環時間成形出對角尺寸3吋 、板厚0.3 mm (均一板厚）之具有轉印圖案的導光板。又 在本實施形態，係針對在水平方向進行開閉模之射出壓縮 成形機上所裝設之射出壓縮成形模具作說明，但也能適用 於在垂直方向進行開閉模者。 在上述實施形態，係針對可動框部54可相對模芯部 53改變位置之平抵型模具作說明，但本發明也能適用於 φ ，一方模具之凸部嵌合於另一方模具之凹部內而在其間形 成容積可變的模穴之所謂嵌合型模具。另外，在本實施形 態，係在模具內藉由澆口切斷具將澆口完全切斷，但也能 使取出裝置之夾頭具備：使澆道相對導光板移動的作用或 * 切斷作用等等，而藉由取出裝置來將導光板和澆道分離後 取出。 【圖式簡單說明】 第1圖係從可動盤側朝固定盤側觀察本實施形態的導 -28- 200842022 (26) 光板之取出裝置之前視圖。 第2圖係本實施形態的導光板之取出裝置之側視圖。 第3圖係本實施形態的導光板之取出裝置之主要部分 放大立體圖。 第4圖係本實施形態所使用之導光板之射出壓縮成形 • 模具之截面圖。 第5圖係顯示本實施形態的導光板之射出壓縮成形方 φ 法之流程圖。 第6圖係顯示本實施形態的導光板之射出壓縮成形方 法之流程圖。 第7圖係顯示本實施形態的導光板之射出壓縮成形方 法之流程圖。 第8圖係本實施形態的導光板之射出壓縮成形模具之 澆道襯套之放大截面圖。 第9圖係顯示本實施形態之導光板之射出壓縮成形模 φ 具之澆道形狀和成形循環時間的關係。 第1 0圖係顯示本實施形態之導光板之射出壓縮成形 模具之澆道形狀和成形循環時間的關係。 第1 1圖係顯示本實施形態之導光板之射出壓縮成形 模具之繞道形狀和成形循環時間的關係。 第1 2圖係顯示本實施形態之導光板之射出壓縮成形 模具之澆道形狀和成形循環時間的關係。 第1 3圖係顯示本實施形態之導光板之射出壓縮成形 模具之澆道形狀和成形循環時間的關係。 -29- 200842022 (27) 第1 4圖係顯示其他實施形態之導光板之射出模壓方 法之流程圖。 【主要元件符號說明】 1 1 :射出壓縮成形機 1 6 :固定模具 17 :固定盤 φ 20 :可動模具 21 :可動盤 23 :第1取出裝置 24 :第2取出裝置 3 〇 :夾頭 3 3 :吸附保持部 42 :帶式輸送機 A1 :保持位置 φ A2 :交接位置（釋放位置） A3 :待機位置 B 1 :交接位置（待機位置） B2 :釋放位置 ’ P:導光板 P1 :澆道 P2 :流道 P3 ··澆口 -30-5 3, etc., subject to the pressure at the time of shooting and retreat again. In this manner, the movable frame portion 54 of the movable mold 20 is located further forward than the core portion 53, and the gap between the cavity forming surface 62a of the fixed mold 16 and the cavity forming surface 55a of the movable mold 20 is compared. The position where the initial clamping force is applied as shown in Fig. 1 is widened to a maximum of 50 to 200 /zm. Since the core portion 53 of the movable mold 20 retreats, the molten resin can be ejected into the cavities C1 and C2 where the cross-sectional area of the gate P3 becomes large, and the flow loss of the molten resin can be reduced. As a result, the molten resin can be emitted at a relatively low speed and a low pressure, and in particular, internal stress occurring in the vicinity of the gate of the light guide plate P can be suppressed. When the screw position of the injection device 13 reaches the predetermined pressure holding switching position, the injection control is switched to the pressure holding control. When switching to the pressure holding control, the ~ clamping cylinder 22 still clamps with a high clamping force, and after switching to the pressure holding control and after a certain period of time, the clamping force is reduced. It also reduces the clamping force while maintaining pressure switching. In the present embodiment, the gate cutting tool 58 is advanced by 0.4 5 to 0.8 mm by the driving means (not shown) to reduce the mold clamping force. At this time, the gate cutters 58 of the movable mold 20 and the gate cutters 65 of the fixed molds 16 are interleaved to cut the gates P3. Further, when the gate is cut, of course, the molten resin of the gate P3 does not reach the state of being completely cured. After the gate p3 is cut by the gate cutting tool 58, the gate cutting tool 58 is held at the advanced position. In this manner, the molten resin in the cavities C1 and C2 cannot be completely held from the side of the injection device 1 3, but the movable mold 20 is advanced by the driving of the mold clamping cylinder 22, and the mold φ can be used. The molten resin in Cl and C2 is compressed, and even if shrinkage occurs due to cooling, no depression occurs, and good transfer molding can be performed. During this period, the heating cylinder 12a of the injection device 13 performs the measurement of the molten resin used for the next molding. Before the end of the cooling time, the air passage between the movable frame portion 54 of the movable mold 20 and the cavity forming block 55, the air passage between the cavity forming block 62 of the fixed mold 16 and the insert 66, and the like are started. Supply of air for mold release of molds C1 and C2 (blowing air). The mold clamping cylinder 22 is connected and the pressure is released and the mold is opened. The cooling time from the pressure holding junction Φ bundle to the start of the mold opening (including the pressure discharge) is 2.4 seconds in this embodiment. Then, the mold clamping cylinder 22 is actuated to move the movable disk 21 and the movable mold 20 to perform mold opening. When the mold opening is started, the biting portion 56a at the front end of the movable mold 20 will bite into the runner P1 (including the flow path P2), so that the runner P1 can be transferred from the runner of the fixed mold 16. The bushing 64 is pulled out. Further, the light guide plate P is held by the cavity forming surface 55a by the concave mold shape of the movable mold 20, and is opened in this state. Therefore, both the runner P1 (including the flow path P2) and the light guide plate P after being cut by the gate are held by the movable mold 20 in a state of being separated by -20-200842022 (18), and are moved in the mold opening direction. At the same time as the mold is opened, the mold release air is stopped at the fixed mold 16. In the present embodiment, the time from the start of the movable mold 20 to the completion of the mold opening is 0.5 hours, and the mold opening time can be changed between 〜3 and 0.6 seconds. Further, the mold opening stroke (substantially equal to the interval between the fixed mold 16 and the movable mold 20 at the time of completion of the mold opening) is 60 to 100 mm. When the mold opening completion signal issued by the mold opening is received, the rotation shaft 26 of the first take-up device 23 rotates in the counterclockwise direction of the first figure, and the arm portion 27 and the adsorption holding portion 3 3 are The standby position A3 moves and stops at a position facing the light guide plate P in the vicinity of the movable mold 20 after the mold opening. Next, the rotating shaft 26 is moved by 15 to 30 mm in the mold opening direction, and the arm portion 27, the suction holding portion 33, and the like are moved to the holding position A1. Thereby, each of the adsorption faces 34a of the cup portions 34 of the adsorption holding portion 3 3 abuts against the reflection surface of the light guide plate P (transferred by the cavity forming surface 62a of the fixed mold 16). The air suction of the suction holding portion 3 of the first take-up device 23 is performed at the same time as the take-up device 23 starts to operate. Therefore, when the suction surface 34a abuts, the suction is simultaneously performed. At this time, the suction force is a weak attraction of about -50 - 12 〇 kpa to avoid the formation of marks on the newly formed light guide plate P. Further, since the cup portion 34 of the adsorption holding portion 33 is made of a porous elastic material (sponge), the entire adsorption surface 34a is adsorbed on the light guide plate P, so that formation of marks on the light guide plate P can be further prevented. Further, in the present embodiment, the molding cycle time is only 4.4 seconds, and the heat of the formed light guide plate P is transmitted to the cup portion 34 to reach a certain temperature or higher, which is one of the elements for avoiding the occurrence of marks. -21 - 200842022 (19) While the first take-up device 23 is moved to the holding position A1, the detector 31 performs the following detection, that is, whether the runner P1 extracted from the sprue bushing 64 is in the normal position in the V-groove 28 between the collet members of the inner chuck 30. When the detection benefit 31 detects the 丨 道 pi, the chuck 30 is closed by the electromagnetic actuator, and the runner P1 (including the flow path P2 ′) is held by the chuck 30. When the light guide plate P is sucked by the adsorption holding portion 33, and the runner P1 (including the flow path P2) is held by the chuck 3, the rotating shaft 26 and the arm portion 27 of the first take-up device 2 3 φ The mold plate P is again released from the cavity forming surface 55 a, and the runner P1 (including the flow path P2) is separated from the biting portion 56a at the front end of the protruding pin 56. While the first take-up device 23 performs the mold release of the light guide plate P and the runner Pi (including the flow path P2), the movable mold 20 similarly supplies the air for the release film to assist the molding of the light guide plate P or the like. It is also possible to open a part of the movable frame portion of the movable mold outward or to advance the cavity forming surface to facilitate the removal of the light guide plate P. Then, the rotation shaft 26 of the first take-out device 23 rotates clockwise in the first figure, and the arm portion 27 is swung to the position indicated by the two-dot chain line (the first take-up device 23 and the second take-up device 24 are at the first position). When the position is overlapped in the figure, the rotation of the rotary shaft 26 is stopped. Then, the rotation shaft 26 of the first take-up device 23 is again moved in the mold opening direction, and the arm portion 27, the adsorption holding portion 33, and the like are moved to the delivery position (release position) A2. In the present embodiment, the first extraction device 23 is actuated, and the light guide plate P and the runner P1 are taken out in a separated state, and then moved to the delivery position (release position) A2, and the total time required is 0.4 seconds. Similarly, the light guide plate P is cooled -22- 200842022 (20) The arm portion 40 of the second take-out device 24 is stopped and stands by at the solid line position of the second figure to receive the first take-out at the transfer position (release position) A2. Light guide plate P of device 23. Further, the suction holding portion 4 of the second take-up device 24 starts air suction before coming into contact with the light guide plate P. The suction holding portion 41 of the second take-up device 24 performs strong air suction at a lower vacuum than the adsorption holding portion 33 of the first take-up device 23. Then, the first take-out device 23 moves in the mold opening direction, and the surface of the light guide plate p formed by the cavity forming surface 55 a of the movable mold 20 (the light exit surface in the present embodiment) is used by the second take-out device. When the adsorption holding portion 41 of 24 is suctioned and sucked, the adsorption holding unit 33 of the first take-up device 23 stops air adsorption, and immediately the first take-up device 2 3 is retracted, and the second take-up device 24 receives the light guide plate. P. At the transfer position (release position) A 2, the chuck 30 is opened, and the runner P1 (including the flow path P2) held by the chuck 30 of the first take-up device 23 is dropped into the lower chute 44. The operation of opening the collet 30 to lower the tunnel p 1 may be performed while the runner p 1 is being transferred, but the runner p 1 may fall into contact with the light guide plate P, and the light guide plate P may be taken out from the first place. This operation is performed after the device 23 is transferred to the second take-out device 24 and the first take-up device 23 is retracted in the mold closing direction. When the light guide plate P is delivered to the second take-up device 24 and the runner P1 is dropped, the arm portion 27 of the first take-up device 23 is moved to the standby position A3 indicated by the one-dot chain line in Fig. 1 . In the range where the standby position A3' does not interfere with the moving region of the movable mold 20 and is not affected by the heat of the mold or the like, the closer to the position of the movable mold 20 or the like, the more the -23-200842022 (21) forming cycle time is shortened. When the first take-up device 23 delivers the light guide plate P, the first rotating shaft 37 of the second take-up device 24 rotates counterclockwise in the first figure while being retracted, and is fixed to the first rotating shaft 37. The fixed shaft 38 in the vertical direction is rocked, and at the same time, the second rotating shaft 39 attached to the fixed shaft 38 is also rotated by 90°, and the first member 40a of the arm portion 40 is rotated along with the rotation of the second rotating shaft 39. The second member 40b which is disposed obliquely is also rotated by 90°, and the adsorption holding portion 41 and the light guide plate P held thereby face downward. Further, when the arm portion 40 is swung to the release position B2 indicated by the two-dot chain line in Fig. 1, the first rotating shaft 37 stops rotating and the arm portion 40 stops shaking. Then, the suction holding portion 41 is stopped from being sucked by air, and the light guide plate P is released so as to face downward, so as to fall onto the rubber belt 43 of the belt conveyor 42. In the present embodiment, the two light guide plates P are dropped in a direction orthogonal to the moving direction of the rubber belt 43, but the light guide plate P is not damaged by falling over the rubber belt 43 at an extremely short distance. The second take-up device 24, after the light guide P is released, rotates the first rotating shaft 37 and the second rotating shaft 30 in the opposite manner to the above, and returns to the delivery position (standby position) B1 again. The belt conveyor 42 is intermittently driven in such a manner that the next light guide plate P can be loaded, and the rubber belt 43 is advanced at a certain distance. On the rubber belt 43, the cooling of the light guide plate P is continued, and then the baling operation is performed by hand or by a robot. The first take-out device 23 and the second take-out device 24 are controlled by a controller for a take-out device (not shown) disposed in the injection compression molding machine 1 . The controller for the take-out device is connected to a controller (not shown) that is compressed and compressed into a -24-200842022 (22) machine 11. Therefore, the start of the mold opening signal from the injection compression molding machine 11 is performed, and the air suction of the first take-up device 23 is performed, and the mold opening completion signal is received, and the arm portion 27 of the first take-up device 23 starts to rotate. Further, in accordance with the operation of the arm portion 27 of the first take-out device 23, the air suction of the second take-out device 24 and the operation of the arm portion 40 are started. When the first take-out device 23 is moved to the transfer position (release position) A2 outside the movable mold 20, the mold closing operation is started and the mold closing operation is performed. In the φ state of the present embodiment, the mold closing time from the start of the movable mold 20 to the mold closing time is 0.5 second, and the mold closing time can be adjusted within the range of 0.3 to 0.6 seconds. For example, from the viewpoints of the durability of the injection compression molding machine 1 and the injection compression molding die 51, the measurement stability, and the like, it is not always necessary to pursue the highest mold opening speed and closing speed. In the present embodiment, the take-out devices 23 and 24 are of a rocker type, and the two take-out devices 23 and 24 are transferred to the light guide plate P at the delivery position. The reason for this design is mainly to shorten the cycle time. In the present embodiment, the time required for the φ-out device to take out the light guide plate P is completed (the operation is completed from the mold opening and the arm portion 27 of the first take-up device 23 is operated at the standby position A3, and the light guide plate P is taken out at the holding position A1. The time from the moving area of the movable mold 20 to the transfer position (release position) A2 is 0 · 4 seconds. The above-mentioned time may be in the range of 0 · 1 5 to 1 · 0 seconds. When it is desired to shorten the molding cycle time, it can be performed in the range of 〇 1 5 to 0 · 4 seconds. In order to further prevent the trace of the adsorption holding portion 3 3 from adhering to the high-temperature light guide plate p after forming, the contact speed of the adsorption holding portion 3 3 can be lowered or the mold release air can be blown out by the movable mold 20 (spraying) Blowing air)' But at this time it is better, -25- 200842022 (23) The time required is extended up to about 1.0 second. Further, by partially overlapping the opening and closing mold operation of the movable mold 20 and the operation of the take-out device 23, the molding cycle time can be further shortened by about 0.3 to 0.5 seconds. For example, when the movable mold 20 moved to the position immediately before the completion of the mold opening is detected, the arm portion 27 of the take-out device 23 is operated to overlap the mold opening operation and the intrusion operation of the arm portion 27 to shorten the forming cycle. time. Further, it is detected by the limit switch or the like that the arm portion 27, the suction φ holding portion 33, and the like have moved from the movable region of the movable mold 20 to the outside, and the start of the mold closing signal is issued before the delivery position A2 is reached, thereby closing the mold. The action and the exiting action of the arm portion 27 overlap, and the forming cycle time can also be shortened. The present invention is not limited to the above-described embodiments, and is of course not limited to those skilled in the art in light of the gist of the present invention. The first arm extraction device of the rocker type may be configured such that at least the arm portion can be shaken, and the entire arm portion does not move φ in the opening and closing mold direction, and only the suction holding portion at the tip end of the arm portion opens and closes. Move in the direction of the mold. It is also possible to design that the first take-out device does not move in the mold opening and closing direction, and the second take-up device can be moved in the mold opening and closing direction to perform the transfer. In this case, in order to allow the light guide plate from the mold to be adsorbed to the first take-up device, the mold can be used in the mold. Also set the machine ' or make the movable plate slightly forward. Further, the loading position of the first take-out device and the second take-out device can be selected on a machine tool, a fixed plate, or a floor loading table. Further, in the present invention, the first take-out device removes the light guide plate and the runner in a separated state at the position where the outer portion of the mold is released. Therefore, the second take-out device is not essential. For example, it can be designed to further increase the rotation axis in the arm portion of the first arm of the rocker type -26-200842022 (24), and the light guide plate is horizontally released in the release position to be directly released and loaded on the conveyor. The adsorption holding portion of the first take-out device may be a general rubber mat or a plurality of bellows type, and the material may be urethane rubber, nitrile rubber or the like, and is not particularly limited. Regarding the take-out device, a horizontally movable take-out device that moves between the holding position in the vicinity of the movable mold and the release position outside the mold in the horizontal direction can also be used. At this time, the time required for taking out is φ of 0.8 to 2.2 seconds. The horizontally movable take-out device is provided with: an adsorption holding portion for sucking the light guide plate, a chuck for holding the runner, and taking out the light guide plate and the runner in a separated state. As the adsorption holding portion, a porous elastic material such as ruthenium rubber is preferably used. Further, in the present embodiment, the injection molding die for the light guide plate for a mobile phone having a diagonal size of 3 inches is described. However, the size of the light guide plate may be 1.5 吋 or more and 7 吋 or less (in terms of an area of 7.5). Cm2 or more is less than 150cm2. It also includes four corners without corners but within the aforementioned area. Further, the mold used can be formed into a plurality of light guide plates having a diagonal size of 5 Å or less, or one light guide plate having a diagonal size of 6 to 7 inches. Regarding the shape of the light guide plate, in addition to the light guide plate having a uniform thickness, the wedge-shaped light guide plate whose thickness is thinner from the light incident surface side toward the other side is included, and * the light source through which the light source such as a backlight is transmitted can be diffused. Board, lens, etc. Further, although the resin used for the molding of the light guide plate is only an example of a polycarbonate (for example, Dufflon LC 1 500 manufactured by Idemitsu Kosan Co., Ltd.), as long as the optical performance is excellent, for example, a methacrylic resin or a cycloolefin can be used. Polymer resin and the like. Depending on the type of resin, the temperature of the molten resin and the glass transition temperature will vary from -27 to 200842022 (25). Of course, the timing of the gate cut, the temperature of the cooling medium, the forming cycle time, and the like may vary. Further, the light guide plate P of the present embodiment is an injection compression molding method having a thickness of 0.4 mm. However, in the case of a plate thickness of about 0.2 to 0.4 mm, an injection molding method can be used. The injection molding method initially forms a wide interval between the mold cavities at the closed mold position, and pressurizes the state in which the low mold clamping force or the mold clamping force is close to zero, so that even if the thickness is extremely thin, the temperature can be lowered. The speed is low and the pressure is φ to emit. Fig. 14 is a flow chart showing the injection molding method of the light guide plate, in which a light guide plate having a transfer pattern having a diagonal size of 3 Å and a thickness of 0.3 mm (uniform plate thickness) is formed at a molding cycle time of 4.2 seconds. In the present embodiment, the injection compression molding die mounted on the injection molding machine that performs the opening and closing of the mold in the horizontal direction will be described. However, the present invention is also applicable to the opening and closing of the mold in the vertical direction. In the above embodiment, the movable frame portion 54 can be described as a flat mold that can change the position of the core portion 53. However, the present invention is also applicable to φ, and the convex portion of one mold is fitted into the concave portion of the other mold. A so-called fitting mold in which a variable cavity is formed is formed therebetween. Further, in the present embodiment, the gate is completely cut by the gate cutting tool in the mold, but the chuck of the take-out device can also be provided with the action of moving the runner relative to the light guide plate or * cutting action. Etc., and the light guide plate and the runner are separated by a take-out device and taken out. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a front view of the take-up device of the light guide of the present embodiment viewed from the movable disk side toward the fixed disk side. Fig. 2 is a side view of the take-up device of the light guide plate of the embodiment. Fig. 3 is an enlarged perspective view showing the main part of the light-receiving device of the present embodiment. Fig. 4 is a cross-sectional view showing the injection compression molding of the light guide plate used in the embodiment. Fig. 5 is a flow chart showing the method of the injection compression molding method of the light guide plate of the embodiment. Fig. 6 is a flow chart showing the method of injection compression molding of the light guide plate of the embodiment. Fig. 7 is a flow chart showing the method of injection compression molding of the light guide plate of the embodiment. Fig. 8 is an enlarged cross-sectional view showing a sprue bush of a light-emitting plate of the present embodiment which is taken out of a compression molding die. Fig. 9 is a view showing the relationship between the shape of the runner of the injection compression molding die of the light guide plate of the present embodiment and the molding cycle time. Fig. 10 is a view showing the relationship between the runner shape of the injection compression molding die of the light guide plate of the embodiment and the molding cycle time. Fig. 1 is a view showing the relationship between the bypass shape of the injection compression molding die of the light guide plate of the embodiment and the molding cycle time. Fig. 1 is a view showing the relationship between the runner shape of the injection compression molding die of the light guide plate of the embodiment and the molding cycle time. Fig. 13 is a view showing the relationship between the runner shape of the injection compression molding die of the light guide plate of the embodiment and the molding cycle time. -29- 200842022 (27) Fig. 14 is a flow chart showing the injection molding method of the light guide plate of another embodiment. [Explanation of main component symbols] 1 1 : Injection compression molding machine 1 6 : Fixed mold 17 : Fixed disk φ 20 : Movable mold 21 : Movable disk 23 : First take-out device 24 : Second take-out device 3 〇 : Chuck 3 3 : adsorption holding unit 42 : belt conveyor A1 : holding position φ A2 : delivery position (release position) A3 : standby position B 1 : handover position (standby position) B2 : release position ' P: light guide plate P1 : runner P2 : runner P3 ··gate -30-