1227485 五、發明說明（1 ) 【發明所屬技術領域】 本發明係有關使用於薄型射出成形基板之光碟、光碟之 製造方法及其裝置。 【習知技術】 近年來，適用於聲音或畫面資料之記錄及播送之光碟或 數位多功能影音光碟（以下簡稱DVD )等，以其大記錄容 量而作爲便利性高之光學記錄體來使用。該光學記錄體係 以聚碳酸酯等樹脂基板上由記錄膜、反射膜、保護膜所構 成。 此外，光碟伴隨著記錄容量的增大，而加快雷射之短波 長化或物鏡之開口數NA之增大化，且要求該光碟用基板 之薄型化。特別在於DVD中，係爲採用將單板基板之板厚 由過去的1.2mm設爲0.6mm，且縮短雷射光之光路長、補 正對於翹曲之容許値（日經電子學1 995年2月27日號No. 630 )、藉由接著劑貼合2枚單板光碟之構造。 該等DVD之用途雖係作爲於置放型之記錄播送裝置之 聲音或影像及資料操作之用，亦有採用作爲於DVD-RAM book version 2.1規格之輕巧型（handy type)之影片拍攝 (movie )用途。此係爲以DVD-RAM (外徑4120mm，單 面記錄容量4.7GB)之規格爲依據，外徑爲（/) 80mm (記錄 容量單面1.46GB)之DVD-RAM，且係爲用於變化記錄媒 體之可重寫式之抽取（remover)光碟。 迄今，於居家之外（out door)所使用之光碟係有將音 1227485 五、發明說明（2 ) 樂進行記錄播送之CD或MD等。CD係爲播送專用 (ROM)型，MD貝(1於記錄媒體上使用於光學磁氣記錄膜之 可進行重寫之形式。前述CD或前述MD之磁軌間距爲1.6 // m，雷射波長爲780nm，單板基板之板厚爲1.2mm，其記 錄密度並非爲擁擠之程度，且使用操作之資料也僅只有聲 音。 相對於此，前述外徑0 80mm之DVD-RAM，係磁軌間 距爲0.615//m，雷射波長爲650nm，單板基板之板厚爲 0.6mm之貼合型光碟之故，在可達成高密度記錄與大記錄 容量下，使用操作於大記錄容量之影像資料。爲此，造成 拖曳伺服機構之追蹤爲困難，且因使用於驅動部振動之狀 態下而相對增大造成一層拖曳落空等問題。 當光碟旋轉時，驅動部之主軸因該光碟之內徑部所承受 的重量不均被稱之爲偏重心。前述4 8 0mm之DVD-RAM因 係爲貼合光碟，故單板基板所構成之光碟會因後述之理由 容易產生較大之偏重心。 於DVD-RAM規格之book version 2.1中，偏重心爲動 態不均（Dynamic inbalance)時，記錄爲在外徑4 120mm 之 DVD-RAM 爲 S 0·01 g · m ( S 1.0g · cm )，外徑 0 80mm 之 DVD-RAM 爲 S 0.0045 g · m ( S 0.45 g · cm )。然而， 外徑0 80mm之DVD-RAM光碟即便是在此規格之內，可得 知當影片拍攝一面運轉一面進行記錄之際，於主軸承受過 負荷而使產生無法正常的記錄播送之情況。 1227485 五、發明說明（3 ) 前述外徑0 80mm之DVD-RAM之型態係如第6圖所 示。然，此係爲將單板基板8之厚度t爲0.6mm之2枚單 板光碟貼合以形成DVD之例示的一型態。由此貼合之光碟 爲使前凹穴或前凹槽貼合於基板上所刻之記錄信號面前凹 穴或前凹槽，藉由雷射將記錄入射面形成相反於貼合面， 且外徑爲4 80mm之DVD-RAM之情況下，於記錄入射面側 成膜有由紫外線硬化樹脂所形成之硬質披覆膜25。於記錄 信號面上，由反射膜或相變化記錄膜等所形成、且藉由衝 擊或沉積所設置的記錄膜22,及將該記錄膜以酸化等進行 保護之紫外線硬外樹脂等所形成之保護膜36依順序依次積 層。且該等各單板經由以熱溶或紫外線硬化接著劑等所形 成之接著層29而被貼合。亦有接著劑與保護膜爲被一體化 之情況，且亦有爲不使記錄膜僅成膜於單面而設置有模擬 (dummy )基板之情況。 DVD-RAM方面，爲記錄膜之相變化膜雖係爲1 // m以 下之程度，然保護膜及接著劑之膜厚亦分別有數十//m。 單板基板之厚度爲1.2mm與厚保護膜或具有1層硬質披覆 膜而無接著劑之CD等光碟相互比較之下，DVD-RAM係爲 加算有接著劑或保護膜之厚度，而易使得貼合後之光碟有 整體厚度不均增大之情形。隨之形成重量均衡性惡化、容 易產生過大之偏重心。 基板係由使用代表於聚碳酸酯之塑膠材料以射出成形方 法所製作。其槪念圖如第7〜9圖所示。第7圖係爲顯示射 1227485 五、發明說明（4 ) 出成形用模具之局部斷面圖，係爲顯示爲於固定模具以及 可動模具之結合面之分模線30爲閉合之狀態。其重力方向 係如爲圖中下之方向者。固定模具以及可動兩模具之中心 調整係爲以具有環狀之推拔嵌合之導引環33來進行，然， 亦具有以圓柱狀之定位部與軸承襯套進行中心調整之定位 導引柱形式之模具，雖以相對於導引環模具之圓周狀導引 進行中心調整，因定位導引模具係在離開模穴之位置以線 接觸進行中心調整，定位導引柱形式之模具方面，可認爲 是當中心調整精度爲劣之模穴開啓時具有較優越之平行 性。此外，固定模具及可動模具爲藉由溫調迴路32所流經 的冷卻水進行溫度控制。 樹脂的充塡係如下所述而進行。分模線30爲閉合或是 僅些許開啓的狀態下，以未圖示之成形機射出前端部將溶 融樹脂通過澆道10充塡至模穴31，且藉由固定模具或可 動模具中至少一方所裝設之衝塊11，將前凹槽或前凹穴的 資料轉寫至基板。於單板基板板厚爲薄的DVD上，需平順 的充塡溶融樹脂，且必須要減低雙折射。加速充塡速度係 有如第8圖之（a )所示大幅開啓模穴以成形一般性的薄型 基板之方法。然而，大幅開啓模穴時，對導引環模具而 言，易產生如上述之平行性受損且模穴厚度於一周內易產 生偏移。對導引柱模具而言，則易產生模具在閉合狀態與 開啓狀態下之平行度有極大的差異生成，且因在模穴閉合 狀態下之中心調整精度爲難，故同樣的難以維持模穴之平 1227485 五、發明說明（Ο 行。由於該等主要原因，板厚0.6mm之DVD基板之板厚一 周不均較板厚1.2mm之基板更容易形成爲大。又，當爲薄 型基板的情況下，係因提升樹脂溫度而使粘度下降進行充 塡之故，於模具內所強調之冷卻不均而使一周內之基板冷 卻速度之不均一性形成板厚不均一性之要因。於相同之板 厚一周內生成不均的情況下，板厚爲薄者，其重量不均形 成爲大，且其偏重心亦形成爲大。 如第9圖所示之充塡後的樹脂，於充塡後的溶融狀態時 於成形機未圖示之活塞進行連動而作動、以切斷衝壓部12 將內徑進行穿孔。在驅動切斷衝壓部時，因於上下左右之 偏心而使相對於基板內徑形成基板外徑之更大的偏心。如 上述，以開啓模穴之成形方法因容易造成固定模具及可動 模具之中心調整精度的大幅偏移，故內徑之中心偏移形成 爲重要之問題。內徑之中心偏移係形成爲於主軸旋轉時所 承受之負荷亦形成不均衡，進而造成偏重心增大之要因。 藉由上述觀點，於習知之DVD等薄型基板的成形技術中， 因難以減低厚度不均或對於內徑之外徑偏心而無法達成減 低單板基板之偏重心。 一方面，用以貼合單板光碟之貼合方法係有將熱溶接著 劑塗覆於貼合面側使之密著之方法，然在DVD中貼合以同 樣構成之單板間，如於兩面進行記錄且外徑爲0 80mmDVD-RAM光碟之情況下，係爲以利用下述之網目印刷方式爲其 主流。其槪念圖如第10〜15圖所示。 1227485 五、發明說明（6 ) 首先，將丙烯酸系紫外線硬外樹脂於噴濺記錄膜上以旋 轉塗敷法塗覆之後，如第10圖所示照射紫外線而形成保護 膜36。進一步而言，係於兩單板光碟之貼合面側以旋轉塗 敷印刷法塗覆遲效性接著劑。如第1 1圖所示，接著劑於網 孔構造之印刷用網目9上因積存有環氧系接著劑29，故以 如第12圖所示往復塗刷器13而自網目9染出所成膜。於 網目板所形成之網孔部係成爲圓環狀而使僅有該部分塗覆 有接著劑。藉由網孔粗度或塗刷器1 3之速度抑或是接著劑 之粘度、Tg等控制接著劑之膜厚或其分布。且如第13圖 所示分別於兩單板光碟上，接著劑上藉以照射紫外線而使 接著劑開始反應之後，如第14圖所示，將兩單板光碟藉由 較基板內徑7且外徑6爲小之銷將中心合致。於此狀態下 兩單板光碟並非完全爲一體化，且其翹曲係亦呈無法校正 之爲大的狀態，故如第15圖所示藉由將衝壓面板19貼上 具有彈性體之隔板（felt ) 14以施加壓力而用以矯正翹 曲。施加於衝壓面板之壓力係由未圖示之氣壓缸等控制， 當兩單板光碟或接著劑及隔板完全被壓緊的狀態下停止上 下之衝壓。此種方法係週知於日本專利公開第平10-241216 號或日本專利公開第平10 — 255341號等。此種貼合光碟的 情況下，於習知第14圖中，將基板內徑與中心合致之銷外 徑的間隙係因考慮基板之不均而爲50 // m以上之程度， 故，此鬆裕度爲造成兩單板光碟朝徑向錯位之情形，在此 情況下，造成重量均衡性亦即偏重心之惡化。又，經由本 1227485 五、 發 明說明（7 ) 案 發 明 者之檢討下，於第1 5圖所示可得知’在衝壓 時 1 上 下 之 面 板因傾斜而無法於平行進行衝壓之故’所以 造 成 接 著 劑 不 均之範圍變寬且使光碟於其厚度產生不均 者 〇 另 外 9 如 第12圖所示之作業程序中，係以塗刷器藉由 網 巨 版 之 網 孔 而造成接著劑的染出量具有不均之情形，於 習 知 之 衝 壓 方 法並無法能將此進行吸收。將接著劑之厚度 調 整 爲 20 100// m而使厚度變化爲較厚程度之重量均衡性 〇 雖 厚 度 爲 薄 可容易的控制偏重心，然以習知之衝壓方法 想 以 接 著 劑 達 到緩衝器之效果進而吸收衝壓壓力之偏移， 卻 因 其 緩 衝 效 果爲弱而使得局部性產生應力且面震動之加 速 度 惡 化 〇 亦 即，在習知之貼合方法中，因兩單板光碟之 位 置 偏 移 或 法減低產生於接著劑之厚度不均而造成之偏 重 心 ， 因 上 述 之理由而在振動增大之環境下作爲媒體使用 仍 具 有 一 定 之 限制。 [ 發 明 所欲解決之問題】 本發明之目的，係用以解決上述習知技術之問題 者 ， 即 便使 用 偏重心爲小之可攜式影片拍攝（handy movie ) 亦 可 負 荷 之 使用薄型射出成形基板之光碟，進一步而言 ， 係 爲 提 供使 用薄型射出成形基板之光碟、光碟之製造方 法 及 其 裝 置 〇 [ 解 決 問題之手段】 爲達成上述目的，作爲本發明主要態樣之貼合型 光 碟 ， 其特 徵 係包含厚度爲0.8mm以下之單板射出成形基 -9- 板 5 外 1227485 五、發明說明（8) 徑爲100mm以下，偏重心則爲〇.lg· cm以下者。該光碟 即便係爲偏重心爲〇· 1 g · cm以下且適用於小的輕巧型 (handy type)之影片拍攝，無關於主軸之過負荷而可進行 正常的記錄播送者。另外，該光碟因係爲直徑100mm以下 之小型光碟，故適用於作爲攜帶用之媒體，且其偏重心亦 可維持在極小程度。又，該光碟係因單板的厚度薄至 0.8mm以下，故重量輕、且便於攜帶。此外，該光碟因係 爲貼合型之故，即便作爲光碟整體之各單板之偏重心爲 O.lg _ cm以下，其偏重心亦具有爲O.lg · cm之情況，雖然 2個單板分別於偏重心係爲O.lg · cm以上之情況，藉由將 兩者的相位消除般而下，亦包含有作爲光碟整體之偏重心 形成爲0.1 g · c m之情況。 作爲本發明其他態樣之貼合型光碟，其特徵係包含厚度 爲0.8mm以下之單板射出成形基板，偏重心爲0.05g · cm 以下之可雙面記錄者。該光碟即便偏重心爲0.05g · cm以 下且適用於小的輕巧型之影片拍攝，無關於主軸之過負荷 而可進行正常的記錄播送者。另外，該光碟係因單板的厚 度薄至0.8mm以下，故重量輕、且便於攜帶。且，該光碟 因可雙面記錄，故較使用模擬（dummy )板且僅能進行單 面記錄之光碟便利。 作爲本發明又一態樣之光碟，其特徵係在於偏重心爲 O.Olg · cm以下者。該光碟即便適用於小的輕巧型之影片拍 攝，無關於主軸之過負荷而可進行正常的記錄播送者。在 -10- 1227485 五、發明說明（9) 此範圍內具有偏重心時，則不限光碟之外徑。該光碟亦可 爲貼合型光碟。 另外，作爲本發明再一態樣之光碟製造方法，其使用模 具係具有，固定模具；可動模具，係相對於該固定模具在 可移動下所設置，且於前述固定模具共同形成用以劃定光 碟用基板而形成模穴者；第1平行維持機構，用以維持前 述可動模具在移動時之平行性；以及偏心調節部，係將前 述基板成形之材料充塡至前述模穴後，用以調節以衝斷該 基板之中心部般設置有可移動之衝斷部之偏心；且具有用 以射出成形厚度爲〇.8mm以下之前述基板之步驟。該方 法，因使用藉由第1平行維持機構及偏心調節部而防止偏 心之模具，故可製造出同上述般偏重心爲小之光碟。在此 種情況下，前述模具進一步而言亦可具有傾斜前述模穴至 任意高度之傾斜機構。藉此，而可防止於模穴所產生不均 一的應力。另外，該模具亦爲以本發明之其他方面所構 成。 進一步而言亦可具有將2枚前述基板貼合以形成外徑爲 100mm以下及/或形成可雙面記錄光碟之步驟。如上述， 可期望防止該等小型或可雙面記錄光碟之偏重心。 前述形成步驟，係爲將銷安裝於2枚之前述基板，亦可 具有將前述中心孔之孔徑與前述銷之銷徑之間的間隙調節 於5O//m/0以下、更佳係爲調節於以下之步 驟。藉由將間隙變小而可形成偏重心爲小之光碟。 -11- 1227485 五、發明說明（1 0 ) 前述形成步驟，其所使用衝壓機係具有，固定衝壓部； 可動衝壓部，係相對於該固定衝壓部且以可移動而所設置 者，與前述固定衝壓部同樣用以按壓前述基板；第2平行 維持機構，係用以維持前述可動衝壓部於移動時之平行 性；且具有藉由貼合2枚之前述基板而形成光碟之步驟。 第2平行維持機構，係防止於基板發生不均一之應力。另 外，該衝壓部係亦爲以本發明之其他方面所構成。 【本發明較佳實施例之詳細說明】 以下所揭示之實施例係爲詳細說明本發明之效果。 (實施例1 ) 於第1圖所示係於本實施例之光碟模具之局部斷面 圖。在導引環33之一方向係附加有導銷2、引導襯套3、 以及由導銷支撐部1所形成之導引環平行維持機能5。該 導引環平行維持機能5係爲用以無損導引環的中心調整精 度，而由以下之順序進行裝配。首先，將兩模具暫時先以 螺釘抵止，在分模線30開啓未進行調整中心的狀態下，意 即，在不使發生模具閉鎖力的狀態下將模具充分的昇溫。 接著於固定模具或是可動模具之任一方的模具在成形機增 加鎖緊的狀態下，使產生閉鎖力且將導引環33閉鎖而使另 一方的模具亦完全閉鎖裝設。藉由該方法，首先，會於成 形昇溫的狀態下維持導引環的中心調整精度。進一步而 言，導引環平行維持機能5暫時抵止模具以等待昇溫，且 使產生模具閉鎖力用以將導銷2以及引導襯套3完全的固 -12- 1227485 五、發明說明（11) 定。藉由此種裝設方法，導引環平行維持機能5於導引環 進行中心調整時的分模線30閉鎖時並未有所運作，而僅在 分模線開啓且具有損壞導引環之中心調整性時開始運作。 隨著裝設該導引環平行維持機能5，即便是導引環模具 之模穴如第2圖所示開啓時，明顯的無損其平行性，而可 減低基板的板厚不均。 本發明之模具，係於固定模具側***有切斷衝壓部i 2 之母座切斷部所有之線軸襯套1 5之位置上，附加有可朝任 意方向挪移之環狀偏心調整環4。當於公座切斷部之切斷 衝壓部相對於母座切斷部有所偏心時，因切斷衝壓部沿襲 於此而傾斜***、且對於內徑因外徑的偏心增大偏重心亦 增大之故，線軸襯套15之偏心方向可以於事先使偏心調整 環4偏心而使衝壓切斷部不致傾斜般的如第3圖所示進行 調整。於本實施例中，首先裝配避免偏心的偏心調整環之 後成形基板。該成形基板係以工具顯微鏡來測定。該成形 基板因其外徑相對於內徑偏心有20// m(0- P)，故將偏 心爲20 // m之偏形調整環4裝設於用以矯正偏心方向之線 軸襯套15之外側。其結果，相對於在成形基板之內徑，其 外徑之偏心量爲減低有3 // m ( 0 - P )。 其次，使用本實施例之模具以製作出板厚0.6mm、內徑 4 15mm、外徑0 80mm之DVD-RAM用成形基板。成形機 係爲具有住友重機械工業所製之直壓式模具閉鎖機構之成 形機SD30，衝塊爲用以形成DVD-RAM格式（記錄容量單 -13- 1227485 五、發明說明（12) 面爲1.46GB，磁軌間距爲0.615// m)之物，聚碳酸酯樹脂 則是使用帝人化成社所製之AD5503。模具溫調之設定溫度 不論是固定模具及可動模具均爲1 22 °C，樹脂（滾筒）溫 度爲380 °C，充塡最高速度則係爲成形機最大能力之 300mm/ s，充塡時間則設爲0.08s。模穴之最大開啓量設 爲300 // m。對於成形基板之板厚一周不均之最大値則以安 力茲（音譯：Anritsu )所製之雷射厚度測定機進行測定， 其於外周半徑38mm則有4/zm。且於全面信號區域之板厚 不均爲6//m。該基板之偏重心於島津動釣合試驗機DBM —VC型計測裝置的測定下則爲0.02g · m。 於該成形基板之記錄面上由衝塊成膜相變化記錄膜之 後，將紫外線硬化樹脂之硬質披覆層於入射面側之2 // m、 於噴濺記錄膜上成膜10//m之紫外線硬化樹脂之保護膜， 製作出單板光碟。其次，使該單板光碟之記錄面對向，且 藉由網目印刷方法使之貼合。於本發明中，於貼合作業程 序中進行2個改善。 首先於第1改善方面，於第14圖所示在進行基板重合 之際，基板之內徑與銷外徑之間隙係合致爲1 0 ± 5 // m / 4。測定基板之內徑，再以其裝設最適當外徑之銷。準備 有外徑爲4 15.000mm〜0 15.100mm爲止之刻痕爲0.01mm 之定位用銷。在本實施例中，基板內徑係因爲0 15.060〜15.065mm之範圍，故使用外徑爲0 15.050之銷。 於第2改善方面，貼合時的衝壓面板係變更如第4、5 -14- 1227485 五、發明說明（13) 圖。於衝壓完成時，決定高度方向之位置並非如習知以其 他之單板光碟，而是以設置於面板外周之環狀承接板來進 行。此外，因單側片之環狀承接板1 7係以彈簧16於高度 均一方向進行懸浮（float )之故，即便是上面板傾斜也可 吸收且使上下面板於平行下閉鎖而使與單板光碟產生不致 不均之應力。 另外，取下貼覆於習知衝壓部上之彈性體隔板而使可維 持衝壓部之間的平行性。當接著劑之厚度作爲50 /z m情況 下之貼合光碟之厚度於計算上係爲1.29mm。且當衝壓結束 時之上下衝壓部間的距離T目標則設定爲光碟厚度-0.01 mm 而形成設定爲1.28mm。利用此種方法時，即便是於接著劑 有塗覆不均的情況下，因高度係以面板決定之故，因此可 抑制光碟厚度之不均一性。 在本實施例中，其貼合外徑爲0 80mm之DVD-RAM光 碟、且其偏重心爲〇.〇3g · cm。此外，傾斜（tilt)爲0.2° 以內係爲良好。光碟之厚度不均則爲8 // m。 於本實施例中之外徑爲0 80mm之DVD-RAM光碟，即 便是於影片錄影時一面進行拍攝一面有大動作出現亦不會 產生問題而可將記錄再度播送。 (實施例2 ) 使用與實施例1相同之模具製作出板厚0.6mm、內徑必 15mm、外徑0 80mm之DVD-RAM用成形基板。成形機係 爲具有住友重機械工業所製之直壓式模具閉鎖機構之成形 -1 5- 1227485 五、發明說明（1 4 ) 機SD30，衝塊爲用以形成DVD-RAM格式（記錄容量單面 爲1.46GB，磁軌間距爲0.615// m)之物，聚碳酸酯樹脂則 是使用帝人化成社所製之AD5503。模具溫調之設定溫度不 論是固定模具及可動模具均爲122 °C，樹脂（滾筒）溫度 爲380°C，充塡最高速度則係爲成形機最大能力之300mm /s，充塡時間則設爲〇.〇8s。模穴之最大開啓量設爲300 // m。對於成形基板之板厚一周不均之最大値則以安力茲 (音譯：Anritsu )所製之雷射厚度測定機進行測定。該測 定器因係爲非接觸式之故，而可正確地在一周內的無限點 進行測定。當測定η二10枚時，於其外周半徑r = 28mm、 厚度不均則係爲3〜5//m。且於全面信號區域之板厚不均 則爲 4〜6//m。於全面之板厚絕對値之平均値爲 0.600mm 〇 於該成形基板之記錄面上以衝塊成膜相變化記錄膜之 後，將紫外線硬化樹脂之硬質披覆層膜於入射面側成膜爲 2 // m，於衝塊記錄膜上之紫外線硬化樹脂之保護膜則成膜 爲10/zm，製作出單板光碟。確認的是，於保護膜之一周 內厚度不均均係爲在2//m以內。接下來將該單板光碟之 記錄面對向，藉由網目印刷方法使之貼合。在本實施例 中，於貼合裝置係爲使用先鋒牌影音（有限公司）製之網 目印刷形式DVD貼合裝置，接著劑則使用SONI化學製品 製之SK7000。爲使於貼合前之單面側基板之接著劑厚度形 成平均爲40//m而調整網目版之網孔粗度或塗刷器之壓 -16- 1227485 五、發明說明（15) 力。將決定接著劑所塗覆區域之網孔版外徑較製品外徑0 80mm小4 0.5mm而設爲（/> 79.5mm，相對於成形基板之外徑 中心A，使塗覆接著劑之後的外徑中心B不致偏移而於前 後左右調整網目版之位置。爲使於本實施例中之貼合基板 之接著劑硬化以將前述A及B的偏移量形成在1 0 // m以 內，而利用工具顯微鏡一面進行測定一面進行該種調整。 又，於本實施例中，亦於貼合作業程序進行上述2種之改 善。 另外，取下貼覆於習知衝壓部上之彈性體隔板而使可維 持衝壓部之間的平行性。貼合光碟於衝壓前之總厚度在計 算上係爲1.304mm。且當衝壓結束時之上下衝壓板間的距 離T目標則設定爲光碟厚度-0.01mm而形成設定爲 1.294mm。利用此種方法時，即便是於接著劑有塗覆不均的 情況下，因高度係以面板決定之故，因此可抑制光碟厚度 之不均一性。 本實施例中，貼合外徑0 80mm之DVD-RAM光碟之偏 重心係以島津動釣合試驗機DBM-VC型計測裝置來測定。 於本實施例中，將各光碟之偏重心之値規定爲朝裝置的裝 置方向於周方向變動且3次測定之平均値。5枚貼合光碟 之偏重心其最大最小値分別爲O.Olg · cm及0.005g · cm。 在該2枚光碟中，於其總厚度之外周r==38mm裡由接觸式 厚度測定機（黑田精工製DTM-120)所測定之不均結果如 表1所示係爲8至10 μ m。且，R —傾斜（R-Tilt )之最大 -17- 1227485 五、發明說明（16) 値爲0.2°以內係爲良好。 於本實施例之光碟係以下述方法於影片用途中檢證產生 於錄影時的問題。即，作爲錄影裝置之影片係爲使用曰立 製作所（有限公司）製之DVD-RAM ( DZ-MV100 )、且於 光碟***振動試驗機（振硏製G-0050 )後固定該影片，於 振動頻率35Hz、控制振幅0.15mm之條件下一面錄影一面 使之振動。振動試驗時間、意即爲錄影時間分別變化爲 10s、20s、30。於振動試驗後將影片爲靜止狀態而進行錄 影畫面之再度播送，測定出畫面晃動之時間。將同一光碟 於同一條件下進行3次試驗之平均時間設爲於各條件下之 錄影畫面之晃動時間。表1所示係於本實施例中之試驗結 果。如表1所示，於本實施例之光碟2枚均爲在所有振動 條件下進行錄影畫面之再度播送時未見有問題生成。另， 於實際上以人工操作且進行錄影試驗之結果，即便是手部 揮動超越意料之外，可確認的是可進行正常之錄影且無任 何問題。 (實施例3 ) 除將模具模穴以任意高度下朝周方向傾斜般而調整挾持 薄墊片之夾具以外，均以實施例1相同進行成形。且製作 基板之厚度不均爲l〇//m之單板基板係與實施例1相同之 貼合光碟。該光碟之厚度不均係爲15#m。此時之偏重心 係爲0.05g · cm。此外，於本實施例中之外徑爲0 80mm之 DVD-RAM光碟，艮口便是於影片錄影時一面進行拍攝一面有 -18- 1227485 五、發明說明（17) 大動作出現亦不會產生問題而可將記錄再度播送。 (實施例4 ) 除將貼合作業程序之衝壓板以習知上與其他基板相接觸 之方法進行之外，均以實施例2相同之方法製作光碟。於 本實施例中，貼合後之光碟之偏重心爲0.025 g· cm至 0.05 g · cm。該光碟之總厚不均之測定結果以及與實施例2 同樣於振動試驗中所測定之畫面晃動時間之結果係揭示於 表1。如表1所示，於本實施例中，光碟之厚度不均達到 40// m以上且較實施例1更爲惡化，即便於20s以上之振 動條件下，2枚均認定爲於將錄影畫面再度播送時有晃動 情況。然而，於手部揮動超越意料之外時，可確認的是90 %以上之錄影可正常進行。 (實施例5 ) 於貼合作業程序之衝壓時，用以定位之銷之外徑與基板 內徑之鬆裕度係爲使用大約設爲50// m/ 0之習知定位銷 外，其他均以和實施例4相同之方法製作光碟。於本實施 例中，貼合後之光碟的偏重心係爲0.07 g · cm至0.10 g · cm。該光碟之總厚不均之測定結果以及與實施例2同樣於 振動試驗中所測定之畫面晃動時間之結果係揭示於表1。 如表1所示，2枚光碟均在全部的振動條件下認定有於錄 影畫面之2s以下之晃動。於手部揮動超越意料之外時，可 確認的是在40%之頻率度下會產生同樣的症狀。 (比較例1 ) -19- 1227485 五、發明說明（1 8 ) 於製作成形基板時，除自模具挪去導引環平行維持機構 5中之導銷2及導引環3以進行成形之外，其他均以和實 施例5相同之方法製作光碟。於單板基板之厚度不均以及 偏心量係如表1所示，較於本實施例中之光碟更佳惡化。 於本比較例中，貼合後之光碟的偏重心爲0.14 g · cm至 0.20 g · cm。該光碟之總厚不均之測定結果以及與實施例2 同樣於振動試驗中所測定之畫面晃動時間之結果係揭示於 表1。如表1所示，於本比較例之光碟2枚均於所有的振 動條件下認定於錄影畫面有晃動現象。且於手部揮動超越 意料之外時，亦可確認的是相同之症狀會發生有80%以上 之案例。 (比較例2 ) 除移去於成形模具中之導引環平行維持機構5以外，其 他均以和實施例1相同成形基板，而使完成貼合光碟。該 單板成形基板之厚度不均爲17//m、且完成光碟之厚度不 均爲23//m。偏重心爲0.12 g· cm之於本比較例中外徑0 80mm之DVD-RAM光碟進行影片拍攝之錄影時，當拍攝時 一面有較大動作產生時，會發生有無法正常記錄、畫面品 質降低或於畫面生成晃動等問題。 (比較例3 ) 於成形基板製作時，除自模具除去偏心調整環4而以回 復到原先無偏心環之型態進行成形以外，係與比較例2同 樣之方法製作光碟。於單板基板之厚度不均及偏心量係揭 -20- 1227485 五、發明說明（1 9 ) 示於表1’然，偏心量較比較例2之光碟更加惡化。於本 比較例中，在貼合後光碟之偏重心係0.35 g · cm至0.46 g· cm。該光碟之總厚度不均之測定結果以及於與實施例2 相同之振動試驗中所測定之畫面晃動時間之結果如表1所 示。 如表1所示，於本比較例之光碟2枚均於所有的振動條 件下認定於錄影畫面有長時間之晃動現象。且於手部揮動 超越意料之外時，亦可確認的是相同之症狀會發生於全部 的案例下。 於表1所示之各光碟的偏重心與錄影畫面之晃動時間的 關係，係於第16圖中圖表化。如第16圖所示，可淸楚得 知當偏重心大於0.1 g · cm時，錄影畫面之晃動時間便會 顯著的增長。此外，即便如上述於人工操作之錄影試驗 中’可確認的是在偏重心大於〇. 1 g · cm的情況下會有極 大的實際損害出現。因此，爲不致使於影片拍攝用途之光 碟如本實施例之光碟般偏重心形成爲〇.1 g · cm以下，係 已形成需深刻的加以考慮之問題。且如表1所示，最佳係 以如實施例2、4之偏重心爲〇.〇5 g · cm以下者，更進一 步而S ’更佳係以如實施例2之偏重心爲〇.〇1 g· cm以下 者。 -21 - 1227485 五、發明說明（20) 【表1】 偏重心 (g · cm) 錄影影像晃動時間（s) 外周板厚 振動試驗時間 貼合後之厚度 不均（//m) 單板厚度不 均（//m) 10 20 30 實施例1 0.03 8 4 3 實施例2 0.005 0 0 0 8 3〜5 3〜5 0.01 0 0 0 10 實施例3 0.05 15 10 4 實施例4 0.025 0 0 1.5 44 3〜5 3〜5 0.05 0 0.5 1.3 47 實施例5 0.07 0.3 1.3 1.7 45 0.1 0.5 1 1.9 48 比較例1 0.14 1.7 2.8 4 70 20 〜25 10 〜15 0.2 2.5 3.6 5 75 比較例2 0.12 23 17 3 比較例3 0.35 3 5.3 11 72 20 〜25 23 〜28 0.46 4 9 15 78 作爲本發明之光碟型態係爲使用偏重心爲0.1 g · cm以 下薄型基板之貼合光碟。爲達成於此而在成形模具中設置 -22- 1227485 五、發明說明（21 ) 有設計出用以維持平行性之機構等減低射出成形基板之厚 度不均或偏心之機構。此外，於貼合時則藉由抑制光碟偏 移等方法而使光碟即便於貼合時亦不會形成較大之偏重心 者。該等光碟係爲適用於影片拍攝等用途。 圖式簡單說明 第1圖所示係用於本發明之光碟模具之局部斷面構造 圖。 第2圖所示係用於本發明之光碟模具於射出衝塡時之動 作圖解之局部斷面構造圖。 第3圖所示係用於本發明之光碟模具於切斷衝壓部*** 時之動作圖解之局部斷面構造圖。 第4圖所示係用於本發明之貼合面板之斷面圖。 第5圖所示係隨用於本發明之貼合面板時，基板遭衝壓 時之局部斷面構造說明圖。 第6圖所示係貼合之光碟之構成示意圖。 第7圖所示係習知之光碟模具之局部斷面構造圖。 第8圖所示係習知之光碟模具於射出衝塡時之動作圖解 之局部斷面構造圖。 第9圖所示係習知之光碟模具於切斷衝壓部***時之動 作圖解之局部斷面構造圖。 第10圖所示係習知之藉由紫外線而使保護膜硬化之作 業程序示意圖。 第11圖所示係於習知之網目印刷方法中’塗覆貼合用 -23- 1227485 五、發明說明（22) 接著劑之作業程序示意圖。 第1 2圖所示係藉由習知之網目印刷方法以所定厚度之 貼合用接著劑所成膜之示意圖。 第1 3圖所示係使用習知之網目印刷方法貼合光碟中， 使貼合用接著劑開始進行反應之作業程序示意圖。 第14圖所示係使用習知之網目印刷方法貼合光碟中， 貼合時之將中心合致之作業程序示意圖。 第1 5圖所示係使用習知之網目印刷方法貼合光碟中， 衝壓作業程序示意圖。 第1 6圖所示係本發明之光碟之偏重心與畫面晃動之間 之關係圖表。 【圖式符號說明】 1 :導銷支撐元件 2 :導銷 3 :引導襯套 4 :偏心調整環 5:導環平行維持機構 6 :銷外徑 7 :基板內徑 8 :射出成形基板 11 :衝塊 1 2 :切斷衝壓部 16 :彈簧 -24- 1227485 五、發明說明（23) 1 7 :面板外周環 29 :接著劑 30 :分模線 31 :模穴 33 :導環 -25-1227485 V. Description of the invention (1) [Technical field to which the invention belongs] The present invention relates to an optical disc, a method for manufacturing the optical disc, and a device therefor, which are used for a thin injection-molded substrate. [Knowledge technology] In recent years, optical discs or digital versatile video discs (hereinafter referred to as DVDs), which are suitable for recording and broadcasting of sound or screen data, have been used as optical recorders with high convenience due to their large recording capacity. This optical recording system is composed of a recording film, a reflective film, and a protective film on a resin substrate such as polycarbonate. In addition, with the increase in recording capacity of optical discs, the short wavelength of laser light or the increase in the number of openings NA of the objective lens are increased, and the thickness of the substrate for the optical disc is required to be reduced. Especially in the DVD, the thickness of the veneer substrate is adopted from the past 1. 2mm is set to 0. 6mm, shortening the laser light path length and correcting the tolerance for warpage (Nikkei Electronics February 27, 995 No. 630). The structure of bonding two veneer optical discs with an adhesive. Although these DVDs are used as audio or video and data operations in the placement-type recording and broadcasting device, they are also used as DVD-RAM book version 2. 1 Specification for handy type movie shooting (movie) use. This series uses DVD-RAM (outer diameter 4120mm, single-sided recording capacity 4. 7GB) based on specifications, the outer diameter is (/) 80mm (recording capacity single side 1. 46GB), and is a rewritable removable disk for changing recording media. So far, the discs used outside the home are CDs or MDs that record and broadcast the sound 1227485 V. Invention Description (2). The CD is a ROM-only type. The MD shell (1 is used on a recording medium for an optical magnetic recording film that can be rewritten. The track pitch of the aforementioned CD or the aforementioned MD is 1. 6 // m, the laser wavelength is 780nm, and the thickness of the veneer substrate is 1. 2mm, its recording density is not crowded, and the operation data is only sound. In contrast, the aforementioned DVD-RAM with an outer diameter of 0 80mm, the track pitch is 0. 615 // m, laser wavelength is 650nm, board thickness of single board substrate is 0. Because of the 6mm laminated disc, it is possible to use high-density recording and large-capacity recording image data. For this reason, the tracking of the towing servo mechanism is difficult, and it is relatively large due to being used in the state of the vibration of the driving part, which causes a layer of towing to fall out. When the disc rotates, the uneven weight of the main shaft of the drive portion due to the inner diameter of the disc is called the center of gravity. The aforementioned DVD-RAM of 480 mm is a laminated optical disc, so a disc composed of a single board substrate is likely to have a large center of gravity for reasons described below. Book version 2 in DVD-RAM specification In 1, when the center of gravity is Dynamic inbalance, the DVD-RAM recorded on the outer diameter of 4 120mm is S 0 · 01 g · m (S 1. 0g · cm), DVD-RAM with an outer diameter of 0 80mm is S 0. 0045 gm (S 0. 45 g · cm). However, even if the DVD-RAM disc with an outer diameter of 0 80 mm falls within this specification, it can be known that when the filming is performed while recording while recording, the main shaft is overloaded, which may cause abnormal recording and broadcasting. 1227485 V. Description of the invention (3) The above-mentioned type of DVD-RAM with an outer diameter of 0 80mm is shown in Fig. 6. However, this is the thickness t of the veneer substrate 8 is 0. An example of a 6mm 2 veneer disc is laminated to form a DVD. The laminated optical disc is such that the front recess or front groove is bonded to the front recess or front groove of the recorded signal engraved on the substrate. In the case of a DVD-RAM with a diameter of 4 80 mm, a hard coating film 25 made of an ultraviolet curing resin is formed on the recording incident surface side. On the recording signal surface, a recording film 22 formed of a reflective film or a phase change recording film, and provided by impact or deposition, and an ultraviolet hard outer resin, etc., which protects the recording film by acidification, etc. The protective film 36 is laminated in order. The individual veneers are bonded together via an adhesive layer 29 formed with a hot melt or ultraviolet curing adhesive. In some cases, the adhesive and the protective film are integrated, and in some cases, a dummy substrate is provided so that the recording film is not formed on only one surface. For DVD-RAM, although the phase change film for the recording film is less than 1 // m, the thickness of the protective film and the adhesive are also several tens of // m. The thickness of the veneer substrate is 1. Comparing 2mm with a thick protective film or a CD with 1 layer of hard coating film without adhesive, DVD-RAM is added with the thickness of the adhesive or protective film, and it is easy to make the bonded disc Increasing uneven thickness. As a result, the balance of weight deteriorates, and an excessively large center of gravity is likely to occur. The substrate is made by injection molding using a plastic material typified by polycarbonate. The idea map is shown in Figures 7-9. Fig. 7 is a partial cross-sectional view showing a shot 1227485 V. Description of the invention (4) The forming mold is a partial cross-sectional view showing the parting line 30 on the joint surface of the fixed mold and the movable mold is closed. The direction of gravity is the one in the bottom of the figure. The center adjustment of the fixed mold and the two movable molds is performed by using a ring-shaped push-fit guide ring 33. However, it also has a positioning guide column for center adjustment with a cylindrical positioning portion and a bearing bush. Although the mold of the form is adjusted by a circular guide relative to the guide ring mold, the positioning guide mold is centered by line contact at a position away from the cavity. It is considered that when the center adjustment accuracy is inferior, the mold cavity has superior parallelism. In addition, the fixed mold and the movable mold are temperature-controlled by the cooling water flowing through the temperature control circuit 32. Filling of the resin is performed as follows. In the state where the parting line 30 is closed or only slightly opened, the molten resin is filled into the cavity 31 through the runner 10 by the front end of the injection molding machine (not shown), and at least one of the fixed mold or the movable mold is used. The installed punch block 11 transfers the data of the front groove or the front cavity to the substrate. On a DVD with a thin single-board substrate, a smooth filling resin must be used, and birefringence must be reduced. The accelerating charging speed is a method of forming a general thin substrate by substantially opening the cavity as shown in FIG. 8 (a). However, when the cavity is largely opened, for the guide ring mold, the parallelism as described above is easily damaged and the thickness of the cavity is easily shifted within one week. For the guide column mold, it is easy to produce a great difference in the parallelism of the mold in the closed state and the open state, and because the center adjustment accuracy is difficult in the mold cavity closed state, it is also difficult to maintain the mold cavity.平 1227485 V. Description of the invention (0 lines. Due to these reasons, the thickness of the plate is 0. The thickness of the 6mm DVD substrate is unevenly thicker than the thickness by one week. A 2mm substrate is easier to form larger. In the case of a thin substrate, the viscosity is decreased due to the increase in the temperature of the resin, and the uneven cooling rate emphasized in the mold causes the unevenness of the cooling rate of the substrate within a week to form a thickness difference. The reason for uniformity. In the case where the same plate thickness is uneven within one week, the thinner the plate thickness, the larger the weight unevenness and the larger the center of gravity. As shown in FIG. 9, the filled resin is operated in a molten state after filling by a piston (not shown) of the molding machine to operate to cut the punching portion 12 and perforate the inner diameter. When the cutting and punching section is driven to be driven, the eccentricity of the upper, lower, left, right, and left portions causes a larger eccentricity of the outer diameter of the substrate with respect to the inner diameter of the substrate. As described above, since the forming method of opening the cavity is likely to cause a large deviation in the center adjustment accuracy of the fixed mold and the movable mold, the formation of the center deviation of the inner diameter becomes an important problem. The deviation of the center of the inner diameter is caused by the imbalance of the load when the spindle rotates, which causes the increase of the center of gravity. From the above viewpoints, in the conventional thin substrate forming technology such as DVD, it is difficult to reduce the unevenness in thickness or eccentricity with respect to the outer diameter of the inner diameter, so that it is impossible to reduce the center of gravity of the single board substrate. On the one hand, the bonding method for bonding veneer optical discs is a method of applying a hot-melt adhesive to the side of the bonding surface to make it close, and then bonding the same veneer between DVDs, such as In the case of recording on both sides of a DVD-RAM disc with an outer diameter of 0 80 mm, it is mainly based on the following screen printing method. The idea map is shown in Figures 10-15. 1227485 V. Description of the invention (6) First, an acrylic ultraviolet hard resin is applied on a sputter recording film by a spin coating method, and then the protective film 36 is formed by irradiating ultraviolet rays as shown in FIG. Furthermore, a slow-acting adhesive was applied to the bonding surface side of the two veneer optical discs by a spin coating method. As shown in FIG. 11, the adhesive is accumulated on the mesh 9 for printing of the mesh structure because the epoxy-based adhesive 29 is accumulated, so it is dyed from the mesh 9 by reciprocating the brusher 13 as shown in FIG. membrane. The mesh portion formed in the mesh plate has a circular shape, and only this portion is coated with an adhesive. The thickness of the adhesive or its distribution is controlled by the thickness of the mesh, the speed of the applicator 13 or the viscosity, Tg, etc. of the adhesive. And as shown in FIG. 13, the two veneer discs are respectively irradiated with ultraviolet rays on the adhesive agent to start the reaction of the adhesive agent. As shown in FIG. 14, the two veneer discs are placed 7 to 7 The diameter of 6 is the center of the small pin. In this state, the two veneer optical discs are not completely integrated, and the warping system is in a state where it cannot be corrected. Therefore, as shown in FIG. 15, the stamped panel 19 is pasted with an elastomer partition. (Felt) 14 is used to correct warping by applying pressure. The pressure applied to the punched panel is controlled by a pneumatic cylinder (not shown). When the two veneer discs or the adhesive and the partition are completely pressed, the punching is stopped. This method is well known in Japanese Patent Laid-Open No. Hei 10-241216 or Japanese Patent Laid-Open No. Hei 10-255341. In the case of such a laminated disc, the gap between the outer diameter of the pin resulting from the inner diameter of the substrate and the center is about 50 // m or more due to the unevenness of the substrate. The slack margin is a situation in which the two veneer optical discs are displaced in the radial direction. In this case, the weight balance is deteriorated, that is, the center of gravity is deteriorated. In addition, according to the review of the inventor of the 1227485 V. Description of the Invention (7), it can be seen in Fig. 15 that "the upper and lower panels cannot be punched in parallel because of the tilt during punching" The range of the unevenness of the adhesive is widened and the disc is uneven in its thickness. In addition, in the operation procedure shown in FIG. 12, the spreader is caused by the applicator through the mesh of the net giant version. The amount of dyeing is uneven, which cannot be absorbed by the conventional stamping method. Adjust the thickness of the adhesive to 20 100 // m to change the thickness to a thicker degree of weight balance. Although the thickness is thin, the center of gravity can be easily controlled, but the conventional stamping method is intended to reach the buffer with the adhesive. The effect further absorbs the offset of the pressing pressure, but because its buffering effect is weak, local stress is generated and the acceleration of the surface vibration is deteriorated. That is, in the conventional bonding method, the position of the two veneer discs is shifted or The method reduces the center of gravity caused by the uneven thickness of the adhesive. For the reasons described above, the use as a medium in an environment with increased vibration still has certain limitations. [Problems to be Solved by the Invention] The object of the present invention is to solve the problems of the above-mentioned conventional technologies. Even if a portable movie with a small center of gravity is used, a thin injection molding substrate can be used under load. Further, the optical disc is to provide a thin disc using a thin injection-molded substrate, a method for manufacturing the optical disc, and an apparatus therefor. [Means for Solving Problems] In order to achieve the above-mentioned object, as a main type of the conformable optical disc of the present invention, The feature system contains a thickness of 0. Veneer injection molding base of less than 8mm -9- plate 5 outer 1227485 V. Description of the invention (8) The diameter is 100mm or less, and the center of gravity is 0. Those below lg · cm. This disc is suitable for small and handy type movie shooting even if the center of gravity is less than 0.1 g · cm, and it can record and broadcast normally without any overload on the spindle. In addition, the disc is a small disc with a diameter of 100 mm or less, so it is suitable for use as a carrying medium, and its center of gravity can be maintained to a minimum. Also, the optical disc is thinner to 0 due to the thickness of the veneer. Below 8mm, it is lightweight and easy to carry. In addition, the optical disc is a lamination type, even if the center of gravity of each veneer as a whole of the optical disc is O. Below lg _ cm, the center of gravity also has O. In the case of lg · cm, although the two veneers are respectively O in the center of gravity. In the case of lg · cm or more, by removing the phase of the two, the center of gravity of the entire disc is formed to be 0. In the case of 1 g · c m. As another aspect of the present invention, the laminated optical disc is characterized by a thickness of 0. 8mm single veneer injection molding substrate, the center of gravity is 0. 05g · cm or less can record on both sides. The disc even has a center of gravity of 0. Less than 05g · cm and suitable for small and lightweight film shooting, normal recording and broadcasting without overloading the main shaft. In addition, the optical disc is thinner to 0 due to the thickness of the veneer. Below 8mm, it is lightweight and easy to carry. In addition, since the disc can be recorded on both sides, it is more convenient than a disc that uses a dummy board and can only record on one side. As another aspect of the present invention, the optical disc is characterized in that the center of gravity is O. Olg · cm or less. Even if the disc is suitable for small and lightweight filming, there is no overload on the spindle and normal recording and broadcasting can be performed. -10- 1227485 V. Description of the invention (9) When the center of gravity is within this range, the outer diameter of the disc is not limited. The disc may also be a conformable disc. In addition, as another aspect of the optical disc manufacturing method of the present invention, the use mold is provided with a fixed mold; the movable mold is provided in a movable manner relative to the fixed mold, and is formed together with the fixed mold for delineation The optical disk uses a substrate to form a cavity; a first parallel maintaining mechanism to maintain the parallelism of the movable mold when it is moving; and an eccentricity adjustment unit, which is filled with the material formed by the substrate into the cavity and used to It is adjusted to break the eccentricity of the movable punching part like the center part of the substrate; and it has a thickness of 0 for injection molding. Steps for the aforementioned substrates below 8mm. This method uses a mold that prevents eccentricity by the first parallel maintaining mechanism and the eccentricity adjustment unit, so that it is possible to produce an optical disc with a small eccentricity as described above. In this case, the mold may further include a tilting mechanism for tilting the mold cavity to an arbitrary height. This can prevent uneven stress from being generated in the cavity. In addition, the mold is constructed by other aspects of the present invention. Further, the method may further include a step of bonding the two substrates to form an outer diameter of 100 mm or less and / or forming a double-sided recording disc. As described above, it is desirable to prevent the center of gravity of such small or double-sided recording discs. The forming step is to install the pin on the two substrates, and it is also possible to adjust the gap between the hole diameter of the center hole and the pin diameter of the pin to 5O // m / 0 or less, and more preferably to adjust In the following steps. By reducing the gap, a disc with a small center of gravity can be formed. -11- 1227485 V. Description of the invention (1 0) The aforementioned forming step uses a stamping machine having a fixed stamping section; a movable stamping section is provided in a movable manner relative to the fixed stamping section and the foregoing The fixed punching portion is also used to press the aforementioned substrate; the second parallel maintaining mechanism is used to maintain the parallelism of the movable punching portion when moving; and it has a step of forming an optical disc by bonding two of the aforementioned substrates. The second parallel maintaining mechanism prevents uneven stress from occurring on the substrate. In addition, the punching section is also constituted by other aspects of the present invention. [Detailed description of the preferred embodiment of the present invention] The embodiments disclosed below are to explain the effect of the present invention in detail. (Embodiment 1) A partial sectional view of the optical disc mold shown in Fig. 1 in this embodiment is shown. In one direction of the guide ring 33, a guide pin 2, a guide bush 3, and a guide ring parallel maintenance function 5 formed by the guide pin support portion 1 are added. The guide ring parallel maintenance function 5 is used to adjust the accuracy of the center of the non-destructive guide ring, and is assembled in the following order. First, the two molds are temporarily stopped by screws, and the mold is fully heated while the mold line 30 is opened without the center being adjusted, that is, the mold is sufficiently heated without causing the mold locking force to occur. Next, in the state where the mold of either the fixed mold or the movable mold is locked, the locking force is generated and the guide ring 33 is locked, so that the other mold is completely locked and installed. With this method, first, the center adjustment accuracy of the guide ring is maintained in a state where the temperature is raised. Further, the guide ring parallel maintenance function 5 temporarily stops the mold to wait for the temperature to rise, and causes the mold locking force to be used to completely fix the guide pin 2 and the guide bush 3-12- 1227485 V. Description of the invention (11) set. With this installation method, the guide ring parallel maintenance function 5 does not work when the parting line 30 is closed when the centering of the guiding ring is closed, but only when the parting line is opened and the guide ring is damaged. It starts to operate when the center is adjusted. With the installation of the guide ring parallel maintaining function 5, even when the cavity of the guide ring mold is opened as shown in Fig. 2, the parallelism is obviously not damaged, and the uneven thickness of the substrate can be reduced. The mold of the present invention is provided with a ring-shaped eccentric adjustment ring 4 which can be moved in any direction at a position where the bobbin bushings 15 owned by the cutting part of the female seat cutting part i 2 are inserted into the fixed mold side. When the cutting and punching part in the male cutting part is eccentric relative to the female cutting part, the cutting and punching part is inserted obliquely because of this, and the center of gravity is also increased for the eccentricity of the inner diameter due to the eccentricity of the outer diameter. For an increase, the eccentric direction of the bobbin bushing 15 can be adjusted as shown in FIG. 3 by eccentrically adjusting the eccentricity adjustment ring 4 in advance so that the punching and cutting part does not tilt. In this embodiment, a substrate is formed first after assembling an eccentric adjustment ring to avoid eccentricity. This formed substrate was measured with a tool microscope. The shaped substrate has an eccentricity of 20 // m (0-P) relative to the inner diameter, so the deflection adjusting ring 4 with an eccentricity of 20 // m is installed on the spool bushing 15 to correct the eccentricity direction. Outside side. As a result, the eccentricity of the outer diameter is reduced by 3 // m (0-P) relative to the inner diameter of the formed substrate. Next, use the mold of this embodiment to produce a plate thickness of 0. 6mm, 4-15mm inner diameter, 0-80mm outer diameter molded substrate for DVD-RAM. The molding machine is a molding machine SD30 with a direct-pressure mold lock mechanism made by Sumitomo Heavy Industries, and the punch is used to form a DVD-RAM format (recording capacity sheet-13-1227485 V. Description of the invention (12) 1. 46GB with a track pitch of 0. 615 // m), polycarbonate resin is AD5503 made by Teijin Chemicals. The set temperature of the mold temperature is 1 22 ° C for both the fixed mold and the movable mold. The resin (roller) temperature is 380 ° C. The maximum filling speed is 300mm / s of the maximum capacity of the molding machine. The filling time is Set to 0. 08s. The maximum opening of the cavity is set to 300 // m. The largest variation in the thickness of the formed substrate over a period of one week was measured with a laser thickness measuring machine manufactured by Anritsu, which has a radius of 4 / zm at a radius of 38 mm. In addition, the board thickness in the full signal area is not all 6 // m. The center of gravity of this substrate is 0 when measured by a Shimadzu dynamic fishing tester DBM-VC type measuring device. 02g · m. After forming a phase change recording film from a punch on the recording surface of the formed substrate, a hard coating layer of an ultraviolet curing resin was formed on the incident surface side at 2 // m, and a film was formed on the recording recording film by 10 // m UV-curable resin protective film to make a veneer disc. Secondly, the recording of the veneer disc is faced, and it is bonded by a screen printing method. In the present invention, two improvements are made in the cooperative program. Firstly, in the first improvement aspect, as shown in FIG. 14, when the substrates are superposed, the clearance between the inner diameter of the substrate and the outer diameter of the pin is 10 + 5 // m / 4. Measure the inner diameter of the substrate, and then install the pin with the most appropriate outer diameter. Prepared with an outer diameter of 4 15. 000mm ~ 0 15. The score up to 100mm is 0. 01mm positioning pin. In this embodiment, the inner diameter of the substrate is 0.15. 060 ~ 15. 065mm range, so the outer diameter is 0 15. 050 pin. In terms of the second improvement, the stamping panel at the time of bonding is changed as shown in Figures 4 and 5 -14-1227485. 5. Description of the invention (13) Figure. When stamping is completed, the position in the height direction is determined not by using other single-plate optical discs, but by a circular receiving plate provided on the outer periphery of the panel. In addition, because the annular receiving plate 17 of the single-sided sheet is floated by the spring 16 in a uniform height direction, even if the upper panel is inclined, it can absorb and lock the upper and lower panels in parallel to the single board. Optical discs are not subject to uneven stress. In addition, the elastomer spacers attached to the conventional press sections are removed so that the parallelism between the press sections can be maintained. When the thickness of the adhesive is 50 / z m, the thickness of the laminated disc is calculated to be 1. 29mm. And when the punching ends, the distance T target between the upper and lower punching parts is set to the disc thickness -0. 01 mm and the formation setting is 1. 28mm. With this method, even when the adhesive is unevenly coated, the height is determined by the panel, so that unevenness in the thickness of the disc can be suppressed. In this embodiment, it fits a DVD-RAM disc with an outer diameter of 0 80mm, and its center of gravity is 0. 〇3g · cm. In addition, the tilt is 0. Within 2 ° is good. The uneven thickness of the disc is 8 // m. In this embodiment, the DVD-RAM disc with an outer diameter of 0 80 mm can reproduce the recording again even if there is a large movement while shooting while the video is being recorded. (Example 2) Using the same mold as in Example 1, a plate thickness of 0. Molded substrate for DVD-RAM with 6mm, 15mm inner diameter and 0 80mm outer diameter. The forming machine is formed by a direct-pressure mold lock mechanism made by Sumitomo Heavy Industries, Ltd.-1 5- 1227485 V. Description of the invention (1 4) The machine SD30, the punch block is used to form the DVD-RAM format (recording capacity sheet Face is 1. 46GB with a track pitch of 0. 615 // m), polycarbonate resin is AD5503 made by Teijin Chemicals. The set temperature of the mold temperature adjustment is 122 ° C for both the fixed mold and the movable mold. The resin (roller) temperature is 380 ° C. The maximum filling speed is 300mm / s of the maximum capacity of the forming machine. The filling time is set. 0. 〇8s. The maximum opening of the cavity is set to 300 // m. The maximum one-week uneven thickness of the formed substrate was measured using a laser thickness measuring machine manufactured by Anritsu. Because the detector is non-contact, it can accurately measure at infinite points within a week. When measuring η 2 and 10 pieces, the outer radius r = 28 mm and the thickness unevenness were 3 to 5 // m. In addition, the uneven thickness in the full signal area is 4 ~ 6 // m. The average 値 of the absolute 厚 in the overall plate thickness is 0. 600mm 〇 After forming a phase change recording film with a punch on the recording surface of the formed substrate, a hard coating film of ultraviolet curing resin is formed on the incident surface side to a thickness of 2 // m on the recording surface of the punch. The protective film of the ultraviolet curing resin is formed into a film of 10 / zm, and a veneer optical disc is produced. It was confirmed that the thickness unevenness within one week of the protective film was within 2 // m. Next, the recording of the veneer disc is face-to-face, and it is bonded by a screen printing method. In this embodiment, the laminating device is a screen printing DVD laminating device made by Pioneer Media, and the adhesive is SK7000 made by SONI Chemicals. In order to make the thickness of the adhesive on the single-sided substrate before bonding to an average of 40 // m, adjust the mesh thickness of the mesh plate or the pressure of the applicator -16-1227485 V. Description of the invention (15) Force. The outer diameter of the mesh plate in the area where the adhesive is applied will be smaller than the outer diameter of the product 0 80mm 40. 5mm and set to (/ > 79. 5 mm, with respect to the center A of the outer diameter of the formed substrate, the center B of the outer diameter after the application of the adhesive is not shifted, and the position of the mesh plate is adjusted forward and backward. In order to harden the adhesive of the bonded substrate in this embodiment to form the aforementioned A and B offsets within 10 // m, this adjustment is performed while measuring with a tool microscope. Moreover, in this embodiment, the above-mentioned two types of improvements are also carried out in the paste cooperation program. In addition, the elastomer spacers attached to the conventional press sections are removed so that the parallelism between the press sections can be maintained. The total thickness of the laminated disc before stamping is calculated to be 1. 304mm. And when the stamping is finished, the distance T target between the upper and lower stamping plates is set to the disc thickness -0. 01mm and the formation is set to 1. 294mm. With this method, even when the adhesive is unevenly coated, the height is determined by the panel, so that unevenness in the thickness of the disc can be suppressed. In this embodiment, the center of gravity of a DVD-RAM disc with a bonded outer diameter of 0 80 mm is measured using a Shimadzu dynamic fishing tester DBM-VC type measuring device. In this embodiment, the center of gravity of each optical disc is defined as the average volume of three measurements that changes in the circumferential direction toward the device direction of the device. The center of gravity of the five laminated discs is the maximum and minimum 値, respectively. Olg cm and 0. 005g · cm. In these two discs, the unevenness measured by a contact thickness measuring machine (DTM-120 manufactured by Kuroda Seiko) outside the total thickness r == 38mm is 8 to 10 μ as shown in Table 1. m. And, R — the maximum of the tilt (R-Tilt) -17- 1227485 V. Description of the invention (16) 値 is 0. Within 2 ° is good. The optical disc in this embodiment is used in the following method to verify the problems caused during video recording in film use. That is, the film used as a video recording device is a DVD-RAM (DZ-MV100) manufactured by Yue Li Seisakusho (Co., Ltd.), and the film is fixed after being inserted into a vibration tester (G-0050 manufactured by Vibrator), and the Frequency 35Hz, control amplitude 0. Under the condition of 15mm, it was recorded while vibrating. The vibration test time, which means the recording time, changed to 10s, 20s, and 30, respectively. After the vibration test, the video was re-broadcast in the still state, and the time of the screen shaking was measured. The average time of three tests performed on the same disc under the same conditions was set as the shaking time of the video image under each condition. Table 1 shows the test results in this example. As shown in Table 1, the two discs in this embodiment were all generated without any problems when the video images were re-broadcasted under all vibration conditions. In addition, as a result of the manual operation and video recording test, even if the hand was shaken beyond expectation, it was confirmed that normal video recording was possible without any problems. (Example 3) The same procedure was performed as in Example 1 except that the jig for holding the shim was adjusted such that the mold cavity was tilted in a circumferential direction at an arbitrary height. In addition, the veneer substrate with a thickness of 10 // m is not the same as the laminated optical disc of the first embodiment. The uneven thickness of the disc is 15 # m. The center of gravity at this time is 0. 05g · cm. In addition, in this embodiment, the DVD-RAM disc with an outer diameter of 0 80mm is recorded at the time of film recording when the video is recorded. -18-1227485 V. Description of the invention (17) No major action will occur. Question and the record can be rebroadcasted. (Embodiment 4) The optical disc was produced in the same manner as in Example 2 except that the stamping plate of the paste process was conventionally contacted with other substrates. In this embodiment, the center of gravity of the disc after bonding is 0. 025 gcm to 0. 05 g · cm. The measurement results of the total thickness unevenness of the optical disc and the results of the screen shake time measured in the vibration test in the same manner as in Example 2 are shown in Table 1. As shown in Table 1, in this embodiment, the thickness unevenness of the optical disc reaches 40 // m or more and is worse than that of Example 1. Even under the vibration condition of more than 20s, both of them are considered to be recording pictures There was shaking during the rebroadcast. However, when the hand was waved beyond expectation, it was confirmed that more than 90% of the recording could be performed normally. (Embodiment 5) In the stamping process, the clearance between the outer diameter of the pin used for positioning and the inner diameter of the substrate is determined using the conventional positioning pin set to approximately 50 // m / 0 The optical discs were produced in the same manner as in Example 4. In this embodiment, the center of gravity of the optical disc after bonding is 0. 07 gcm to 0. 10 g · cm. Table 1 shows the measurement results of the total thickness unevenness of this optical disc and the results of the screen shake time measured in the vibration test in the same manner as in Example 2. As shown in Table 1, under both vibration conditions, the two discs were considered to have a shake of less than 2 s on the recording screen. When the hand was swung beyond expectation, it was confirmed that the same symptoms would occur at a frequency of 40%. (Comparative example 1) -19- 1227485 V. Description of the invention (1 8) When manufacturing the forming substrate, except for removing the guide pin 2 and the guide ring 3 in the guide ring parallel maintaining mechanism 5 from the mold for forming The rest are made in the same way as in Example 5. The thickness unevenness and eccentricity of the veneer substrate are as shown in Table 1, which is better than the optical disc in this embodiment. In this comparative example, the center of gravity of the disc after bonding is 0. 14 gcm to 0. 20 g · cm. The measurement results of the total thickness unevenness of the optical disc and the results of the screen shake time measured in the vibration test in the same manner as in Example 2 are shown in Table 1. As shown in Table 1, the two optical discs in this comparative example were found to have a shaking phenomenon on the recording screen under all vibration conditions. In addition, when the hand was waved beyond expectation, it was confirmed that more than 80% of the same symptoms occurred. (Comparative Example 2) Except for the guide ring parallel maintaining mechanism 5 which was removed from the forming mold, the other parts were formed on the same substrate as in Example 1 to complete the bonding of the optical disc. The thickness of the veneer forming substrate is not all 17 // m, and the thickness of the finished optical disc is not 23 // m. The center of gravity is 0. 12 g · cm is compared with the DVD-RAM disc with an outer diameter of 0 80 mm in this comparative example for video shooting. When a large movement occurs on one side during shooting, it may occur that normal recording is not performed, the picture quality is reduced or the picture is generated Shaking and other issues. (Comparative Example 3) At the time of forming a molded substrate, an optical disc was produced in the same manner as in Comparative Example 2 except that the eccentric adjustment ring 4 was removed from the mold and formed in a form in which the eccentric ring was previously restored. The thickness unevenness and eccentricity of the veneer substrate are revealed. -20-1227485 V. Explanation of the invention (19) is shown in Table 1 '. However, the eccentricity is worse than the optical disc of Comparative Example 2. In this comparative example, the center of gravity of the optical disc after bonding is 0. 35 gcm to 0. 46 g · cm. Table 1 shows the measurement results of the total thickness unevenness of the optical disc and the results of the screen shaking time measured in the same vibration test as in Example 2. As shown in Table 1, the two optical discs in this comparative example were found to have a long-term shaking phenomenon on the video screen under all vibration conditions. And when the hand was waved beyond expectation, it was confirmed that the same symptoms would occur in all cases. The relationship between the center of gravity of each disc shown in Table 1 and the shaking time of the video frame is shown graphically in Figure 16. As shown in Figure 16, we can clearly know that when the center of gravity is greater than 0. At 1 g · cm, the shaking time of the video image will increase significantly. In addition, even in the manual video recording test as described above, it can be confirmed that the center of gravity is greater than 0. In the case of 1 g · cm, significant actual damage can occur. Therefore, in order not to cause the disc for film shooting purposes to be as eccentric as the disc of this embodiment, the center of gravity is formed to 0.1. Below 1 g · cm is a problem that needs to be considered deeply. And as shown in Table 1, it is best to set the center of gravity as in Examples 2 and 4. 〇5 g · cm or less, a further step and S ′ is more preferred as the center of gravity of Example 2 is 0. 〇1 g · cm or less. -21-1227485 V. Description of the invention (20) [Table 1] Eccentricity (g · cm) Shaking time of video image (s) Thickness of outer plate thickness after vibration test time unevenness (// m) Single plate thickness Unevenness (// m) 10 20 30 Example 1 0. 03 8 4 3 Example 2 0. 005 0 0 0 8 3 ~ 5 3 ~ 5 0. 01 0 0 0 10 Example 30. 05 15 10 4 Example 4 0. 025 0 0 1. 5 44 3 ~ 5 3 ~ 5 0. 05 0 0. 5 1. 3 47 Example 50. 07 0. 3 1. 3 1. 7 45 0. 1 0. 5 1 1. 9 48 Comparative Example 1 0. 14 1. 7 2. 8 4 70 20 to 25 10 to 15 0. twenty two. 5 3. 6 5 75 Comparative Example 2 0. 12 23 17 3 Comparative Example 3 0. 35 3 5. 3 11 72 20 to 25 23 to 28 0. 46 4 9 15 78 as the disc type of the present invention is to use a partial center of gravity of 0. Laminated discs with thin substrates less than 1 g · cm. In order to achieve this, it is set in the forming mold -22-1227485 V. Description of the invention (21) There is a mechanism designed to reduce the unevenness or eccentricity of the injection molding substrate, such as a mechanism to maintain parallelism. In addition, during bonding, by suppressing the displacement of the optical disc and other methods, the optical disc will not form a large center of gravity even when it is bonded. These discs are suitable for filming and other purposes. Brief Description of Drawings Fig. 1 is a partial cross-sectional structure view of a disc mold used in the present invention. Fig. 2 is a partial cross-sectional structure diagram illustrating the operation of the optical disc mold used in the present invention at the time of injection. Fig. 3 is a partial cross-sectional structure diagram of the operation diagram of the optical disc mold used in the present invention when the cutting and punching portion is inserted. Fig. 4 is a sectional view of a laminated panel used in the present invention. Fig. 5 is an explanatory view showing a partial cross-sectional structure when a substrate is punched when it is used in a laminated panel of the present invention. Figure 6 is a schematic diagram of the structure of a bonded optical disc. FIG. 7 is a partial cross-sectional structure diagram of a conventional optical disc mold. FIG. 8 is a partial cross-sectional structure diagram of a conventional operation diagram of a disc mold when it is shot. FIG. 9 is a partial cross-sectional structure diagram illustrating the operation of a conventional disc mold when the cutting and punching portion is inserted. Fig. 10 is a schematic diagram showing a conventional operation procedure for curing a protective film by ultraviolet rays. Figure 11 shows the conventional screen printing method for coating and lamination -23-1227485 V. Description of the invention (22) Schematic diagram of the operation procedure of the adhesive. Fig. 12 is a schematic diagram of a film formed by a conventional screen printing method with a predetermined thickness of an adhesive for bonding. Fig. 13 is a schematic diagram showing the operation procedure of bonding a compact disc with a conventional screen printing method to start the reaction of the bonding adhesive. Fig. 14 is a schematic diagram of the operation procedure of applying the conventional mesh printing method to the optical discs and bringing the center together during the lamination process. Fig. 15 is a schematic diagram of a stamping operation procedure for bonding a disc using a conventional screen printing method. Fig. 16 is a graph showing the relationship between the center of gravity of the optical disc of the present invention and the screen shake. [Symbol description] 1: Guide pin support element 2: Guide pin 3: Guide bush 4: Eccentric adjustment ring 5: Guide ring parallel maintaining mechanism 6: Pin outer diameter 7: Substrate inner diameter 8: Injection molding substrate 11: Punching block 1 2: Cutting punching part 16: Spring-24-1227485 5. Explanation of the invention (23) 1 7: Panel peripheral ring 29: Adhesive agent 30: Parting line 31: Mold cavity 33: Guide ring-25-