565832 A7 ___B7_ 五、發明説明（j ) 【發明所屬之技術領域】 (請先閲讀背面之注意事項再填寫本頁) 本發明爲按照供記錄的資料，可將雷射光束的照射時 間或照射力之一多階段切換以照射光記錄媒體，將前記資 料多階記錄的光記錄媒體及光記錄方法。 【發明背景】 以往的光記錄媒體是將再生信號之長度（反射信號調 製部的長度）加以多階段變換以記錄資料，相對於此將再 生信號的深度（反射信號的調製度）多階段切換，在相同 長度的各信號記錄複數資料方法已有多項硏究。 此光記錄方法，不同於有無凹孔的二値記錄，可在深 度方向做複數記錄以實現在固定長度內增加信號量。由於 可提升線記錄密度，而有全像照像、多層記錄層等記錄方 法之提案。 在本文以變動反射率的深度等以達成多階段的資料記 錄，稱爲多階記錄。 此種多階記錄中，爲提升記錄密度必需縮短記錄標記 經濟部智慧財產局員工消費合作社印製 〇 但是’記錄標記小於記錄·讀取所使用雷射集光時的 光束直徑時’其多階記錄會有困難。 例如’日本特開平1 〇 一 1 3 4 3 5 3號公報，記載 有關調整多階記錄之雷射光量。如記錄媒體爲色素膜或相 變化膜時’是以記錄部分與未記錄部分的反射差異形成再 生信號。因此’日本特開平1 〇 — 1 3 4 3 5 3號公報的 張尺度適用中國國家標準（CNS ) ( 21GX297公楚） ' " -4- 565832 A7 B7 五、發明説明（2) (請先閲讀背面之注意事項再填寫本頁) 方法’是利用記錄部分與未記錄部分的關係，不適合於多 階段記錄。更具體而言，在相變化膜或色素膜並不存有言己 錄與未記錄的中間狀態。 以往’能夠藉雷射光量之調整在色素膜或相變化膜言己 錄媒體達成多階記錄，主要原因爲變化雷射照射力，以改 變記錄標記寬度。 集光光束通常呈高斯分佈，但記錄膜爲色素膜或相變 化膜時’只在超過某臨界値部分進行記錄。是藉由雷射力 的改變’使可記錄集光光束的光點大小改變，而改變記錄 標記的寬度。 不過，爲提高記錄密度將記錄標記長度縮短爲小於集 光光束直徑時，不容易以藉由雷射力的調製改變標記寬度 達成多階段記錄，尤其是五階段以上的多階記錄。換言之 ’再生時的反射階變化不容易超過五階段。 一般集光光束的直徑以Κλ ./ΝΑ (K :常數，λ :雷射波長，N A :透鏡口徑數）表示。例如光記錄媒體 爲C D (光碟）時的拾波爲；I = 7 8 0 n m，N A = 經濟部智慧財產局員工消費合作社印製 Ο · 4 5時直徑約爲1 · 6 // m。此時記錄標記長度如果 降.至1 . 6 β m以下時，以過去的變換雷射力方法不容易 達成5階段以上的多階記錄。 又如日本特開平1 一 1 8 2 8 4 6號公報所揭示，記 錄層的入射光量如以素位量供給時，記錄層的反應物吸光 度亦有以素位量變化的光記錄媒體。 但推測，這種光記錄媒體，對於雷射照射量（次數） 本紙張尺度適用中國國家標準（CNS ) A4規格（210X29*7公釐） -5- 565832 A7 B7 五、發明説明（3) 的吸光度變化之絕對値非常小，尙未實用化。 (請先閲讀背面之注意事項再填寫本頁) 再以，如日本特開昭6 1 - 2 1 1 8 3 5號公報所揭 示，亦有變換照射彩色照像材料的照射光強度或照射次數 ，以不同階段的發色濃度狀態加以記錄的光記錄方法。 但是此光記錄方法，以照射雷射光讀取時，發色濃度 狀態無法達成5階段以上讀取的困難問題。 爲提升記錄密度，在凸紋與凸紋所夾凹槽的兩方形成 記錄標記的所謂凸紋-凹槽記錄手段。 此凸紋-凹槽記錄，雖然其記錄領域好像加倍，但是 二値記錄時，在凹槽的信號會較大，甚至溢至凸紋，產生 漏話等缺點，實際上不容易大幅提升記錄密度。 【發明槪述】 經濟部智慧財產局員工消費合作社印製 考量上記情況，本發明在提供如C D - R、C D -R W具有一般廣泛使用的圓盤形，以凸紋-凹槽記錄達成 多階段的多階記錄，可獲得良好信號品質的光記錄媒體及 光記錄方法。再以提供，不但可供視訊影像記錄，亦可利 用爲電腦的機外記憶裝置用多階光記錄媒體、光記錄方法 爲目的。 本發明人，對於光記錄媒體的多年銳意硏究，發現多 階段記錄的記錄方法，確認使用此記錄方法，可在圓盤形 的光記錄媒體，以凸紋-凹槽記錄實現五階段以上的高密 度多階記錄。 換言之，由以下的本發明可達成上記目的。 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） -6 - 565832 A7 B7 五、發明説明（4) (請先閲讀背面之注意事項再填寫本頁) (1 ) 一種光記錄媒體，係屬於雷射光束導引用之凹 槽，被夾於與此平行而所設置之凸紋中，且在圓盤半徑方向 被設置成一定間距的同心圓狀或螺旋狀，順著圓盤中心旋 轉狀態下，依據照射雷射光束而在記錄層形成記錄標記以 記錄資料，並且可對此記錄層照射讀取雷射光束以讀取資 料的圓盤形光記錄媒體，其特徵爲：在前記凹槽上及凸紋 上形成前記記錄層，在此凹槽上及凸紋上的前記記錄層’ 以圓盤旋轉方向的單位長而與其直交方向的單位寬連續設 定複數假想記錄單元，在前記假想記錄單元的前記記錄層 ，係可對應於雷射光束的照射時間及照射力之至少一方的 五階段以上調製而形成大小相不同的記錄標記，依此，可 以調製對於記錄標記之假想記錄單元之面積比與透光率中 至少可依據面積比的反射率，而達成五階段以上的多階記 錄。 (2 )如（1 )所述之光記錄媒體，其中前記假想記錄 單元的單位長度，係被設定爲大致與藉由最大照射時間之 雷射光束所形成記錄標記的長度相等。 經濟部智慧財產局員工消費合作社印製 (3 )如（1 )或（2)所述之光記錄媒體，其中前 記凹槽內所設定前記假想記錄單元，係被設定成前記單位 寬度大致與前記凹槽寬度相等。 (4 )如（1 )或（2 )中任一項所述之光記錄媒體 ，其中前記凸紋上所設置的假想記錄單元之前記單位寬度 大致與該凸紋寬度相等。 (5 )如（1 )或（2 )中任一項所述之光記錄媒體 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） 565832 A7 B7 五、發明説明（5) ，其中將前記假想記錄單元的前記單位長度設定成前記讀 取雷射光束的光束腰之直徑以下。 (6 )如（1 )或（2 )中之任一項所述之光記錄媒 體，其中可記錄於前記凹槽及凸紋雙方及爲多階記錄媒體 之至少一方資訊，被預先記錄於包含有凹槽擺動（groove wobble )、凸紋預設孔（land pre-pit)、取樣伺服機構的 預定信號記錄部之至少一部份上。 (7 ) —種光記錄方法，係屬於雷射光束導引用之凹 槽，被夾於與此平行而所設置之凸紋中，且在圓盤半徑方 向被設置成一定間距的同心圓狀或螺旋狀，將前記凹槽及 凸紋上具有記錄層的圓盤形光記錄媒體加以旋轉並在前記 記錄層照射雷射光束，形成記錄標記於記錄層以記錄資料 的光記錄方法，其特徵爲：在前記凹槽及凸紋上的記錄層 上’連續在圓盤旋轉方向複數設定被規定著圓盤旋轉方向 的單位長及與其直交方向的單位寬的複數假想單元，且在 前記各假想記錄單元，至少將雷射光束的照射時間及照射 力之一方，調製成五階段以上，改變形成於假想記錄單元 內的記錄標記之大小，對於假想記錄單元的面積比及記錄 標記的透光率中至少可依據面積比，將該假想記錄單元整 體的光反射率加以調製，達成五階段以上的多階記錄方法 〇 【較佳實施例之詳述】 以下參照圖面將本發明之實施形態例詳加說明。 本紙張尺度適用中國國家標準（CNS ) Α4規格（210X297公釐） --------- (請先閲讀背面之注意事項再填寫本頁) 訂* 經濟部智慧財產局員工消費合作社印製 -8 - 565832 A7 B7 五、發明説明（6) (請先閲讀背面之注意事項再填寫本頁) 有關本發明實施形態例之圓盤形光記錄媒體1 0，爲 記錄1 2使用色素的CD - R或相變化材料的CD — RW ，係由透明基材所構成的基板1 4，及在此基板1 4的一 面（在第1圖爲上面）設有覆蓋導引雷射光束用凹槽1 6 及與其平行的凸紋1 7之前記記錄層1 2，及以濺鍍等法 形成於記錄層1 2上側的金或銀等反射膜1 8，及包覆此 反射膜1 8外側之保護層2 0所構成。 光記錄媒體1 0爲CD - RW時，至少含有由成膜覆 蓋凹槽1 6及凸紋所形成的下部保護層（電介體層）、相 變化材料所構成的記錄層、上部保護層（電介體層）、光 反射層，以及包覆這些的保護層2 0。 前記凹槽1 6是以圓盤形中心爲同心圓狀或螺旋狀， 連續地，且對半徑方向以等間距形成，又在鄰接於半徑方 向的凹槽1 6之間，以平行於同心圓狀或螺旋狀連續形成 凸紋1 7。 經濟部智慧財產局員工消費合作社印製 使用於前記記錄層1 2的色素爲青色素（cyanine )、 部花青（merocyanine)、亞甲基（methene)系色素及其 衍生物、苯硫羥（benzenethiol )金屬絡合物、酞花青（ phtalocyanine )色素、苯亞甲基（naphthalocya门ine )色 素、偶氮（a ζ 〇 )色素等有機色素，相變化材料一般使用 GeSbTe 系，AglnSbTe 系。 前記光記錄媒體1 0的多階記錄，是由第2圖所示光 記錄裝置3 0所執行。 此光記錄裝置3 0爲CD — R/RW記錄器，介軸伺 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） -9 - 565832 A7 B7 五、發明説明（7) (請先閱讀背面之注意事項再填寫本頁) 服3 1由軸馬達3 2將光記錄媒體（磁碟）1 〇以一定線 速度或一定角速度旋轉驅動，由雷射3 6的雷射光束在 1 2光記錄媒體（磁碟）1 〇，依前述方式所形成記錄層 1 2記錄資料。 前記雷射3 6可對應於所記錄資料（情報），由雷射 驅動機3 8控制第1、3圖所示假想記錄單元（詳如後述 )4 〇 ·的每一雷射光束照射時間（例如雷射脈衝數）或 雷射光束照射力（例如雷射脈衝高度或密度）。 弟2圖的編藏4 2爲含有物鏡4 2 A及半形鏡（half m i rr 〇 r ) 4 2 B的記錄光學系。物鏡4 2 A是由聚焦跟踪伺 服機（focus tracking servo) 4 4，將雷射光束控制爲聚 焦於記錄層1 2。又，物鏡4 2 A與半形鏡4 2 B是由送 進伺服機控制在同步於磁碟1 0的旋轉，由內側向外側以 指定速度移動。 前記輻伺服機3 1 、雷射驅動機3 8、聚焦跟踪伺服 機4 4、送進伺服機4 6是由控制裝置5 0所控制。需記 錄於記錄層1 2的資料是輸入於控制裝置5 0。 經濟部智慧財產局員工消費合作社印製 以下就前記假想記錄單元4 0及記錄在該假想記錄單 元4 0的記錄標記加以說明。 此假想記錄單元4 0係規定在記錄媒體直徑方向的單 位寬及旋轉方向的單位長。單位寬爲最內周部分雷射光束 的光束收斂部直徑以下，磁碟1 0的軌道間距及凹槽寬度 等可任意選定。 此實施形態例的假想記錄單元4 0，具體表示如第1 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） -10- 565832 A 7 B7 五、發明説明（8) 圖’沿著前記凹槽1 6及凸紋1 7，在前記記錄層1 2上 ’以磁碟1 0的旋轉方向，亦即圓周方向設定單位長，寬 度設定爲大致相等於凹槽1 6及凸紋1 7，以螺旋狀或同 心圓狀連續設想。 對準這些各假想記錄單元4 0照射雷射光束，依其應 記錄之資料形成如第3圖所示的記錄標記模式4 8 A〜 4 8 G。 此時’前記雷射3 6所射出的雷射光束在記錄層1 2 上的光束直徑D設定爲大於前記假想記錄單元4 0的寬度 ’但可依照記錄層1 2所選擇的材料，在雷射光束的中心 部’改變雷射照射時間或照射力，形成不同直徑的記錄標 記4 8A〜4 8 G (雷射光束爲圓形，但因旋轉光記錄媒 體1 0進行照射，因此記錄標記依照射時間而成爲長圓形 )° 因爲對焦的雷射光束，在常態下爲高斯分布，但雷射 光束的照射能量超過某一臨界値部分才會記錄，所以可變 化照射時間或照射力，使可記錄在記錄層1 2的雷射光束 改變其大小，如此可形成如第3圖所示七階段的記錄標記 4 8 A 〜4 8 G。 此時，各記錄標記4 8 A〜4 8 G的大小，設定爲讀 取之雷射光束照射在假想記錄單元4 0時，其反射光的反 射率亦形成七階段。前記光反射率與記錄標記大小成反比 ，在未形成記錄標記的假想單元之反射率爲大，最大記錄 標記4 8 G所形成的假想記錄單元的反射率爲最小。 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） II--------^-- (請先閱讀背面之注意事項再填寫本頁) 、τ #1. 經濟部智慧財產局員工消費合作社印製 -11 - 565832 A7 _____B7_ 五、發明説明（9) 更精準地說，前記光反射率需考慮各記錄標記4 8 A 〜4 8 G對於假想記錄單元4 0的面積比及記錄標記的透 光率加以設定。 曰己錄標g己4 8 A〜4 8 G的透光率，由於構成記錄層 1 2的材料，受雷射光束的照射而分解變質、改變結晶狀 態或記錄層1 2的厚度變化，會引起折光率的變化。除非 記錄標記部分的透光率爲零，不然需加以考慮。 如前所述，假想記錄單元4 0係設在凹槽1 6上與凸 紋1 7上，但色素記錄層時，其記錄層1 2的厚度在凹槽 1 6上會比凸紋1 7上的爲厚。 因此，對於凹槽1 6與凸紋1 7在記錄時的雷射光束 標準照射時間或標準照射力應有所差異爲宜。 如果，記錄層1 2有足夠厚度，而雷射光束的照射時 間或照射力所形成的記錄標記大小及透光率的差別不大時 ，可不必如上述，在標準照射時間或標準照射力設定差異 0 假想記錄單元4 0的單位長度，可設定爲雷射光束的 最長照射時間時，其照射能量爲超過記錄層1 2起變化的 臨界値時所形成記錄標記，大致等長度即可。 再如下所說明，如可將雷射光束，在假想記錄單元 4 0長度方向尺寸變小時，即可將記錄媒體1 0的磁碟半 徑方向最外側的假想記錄單元4 0的單位長度改變爲小於 雷射光束的光束收斂部直徑。 前記雷射光束在記錄層1 2的位置爲圓形，但是如第 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） si— --1:-- I - - -- - - - - - 1·- n (請先閲讀背面之注意事項再填寫本頁) 一 1< "、-口 · f 經濟部智慧財產局員工消費合作社印製 -12- 565832 A7 B7 五、發明説明（10) (請先閱讀背面之注意事項再填寫本頁) 4圖所示’在物鏡4 2 A添加光束整形稜鏡4 2 C或以小 孔（圖中未標示），將光束形狀改變爲旋轉方向較短，與 其直交方向較長的長圓形或呈線條狀亦可。此時記錄標言己 4 9會變短而可使假想記錄單元變得更短。換言之可提升 記錄密度。 上記實施形態是以C D - R爲光記錄媒體1 〇，但本 發明並不限定於此，對於其他光記錄媒體亦可普偏適用。 又，在上記實施形態例，爲使用藍色素等有機色素或 相變化材料的記錄層1 2 ，但本發明並不限定於此，只要 對應於雷射光束的照射時間可以形成五階段以上大小不同 的記錄標記，即使是上述以外的記錄層亦可。 不過，使用上記之有機色素時，可對依照雷射光束的 五階段以上照射時間，確實地改變記錄標記的大小進行記 錄。 再以，上記實施形態例，爲未記錄資料的光記錄媒體 1 ◦，但本發明並不限定於此，對於可將五階段以上資料 加以多階記錄的再生專用光記錄媒體亦可適用。 經濟部智慧財產局員工消費合作社印製 再以，此光記錄媒體1 0具有，辨識各記錄媒體資訊 之預信號記錄部（詳如後述），以辨識多階記錄用光記錄 媒體及/或凸紋-凹槽記錄用光記錄媒體的資訊，決定記 錄再生各記錄媒體的雷射光束力之資訊等特定資訊。將其 特定資訊在各光記錄媒體再生及/或記錄時讀入，以確實 辨識多階記錄用光記錄媒體，更可將這些資訊分別加以辨 識，或依照預爲記錄的凹坑段數決定雷射光束力的段數， 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） -13- 565832 經濟部智慧財產局員工消費合作社印製 A7 B7 五、發明説明（彳彳） 更確實地執行多階記錄再生。前記預信號部是將凹槽壁部 5 6 A、凸紋預設凹坑5 6 B、取樣伺服機構’分別或組 合使用。但本發明將凸紋亦利用爲記錄領域’因此以不使 用凸紋預設凹坑爲宜。 取樣伺服機構係指，配合信號調製段數所預設不同反 射率之複數凹坑，或在各該光記錄媒體的一部分’如前所 述預先設定多階記錄的已記錄多階記錄的記錄標記5 4 ° (例） 以下就本發明例與比較例，合倂說明之。 以使用相變化材料的C D - R W及使用色素的C D -R做爲記錄媒體1 0，將記錄時間加以調製，進行八階段 多階記錄實驗。 將實驗結果列示如表1 。表內S D R爲多階各階段的 反射率與動態範圍所求得各階段的信號偏差。L / G爲凸 紋-凹槽記錄、G爲凹槽記錄。依據本發明人的實驗，此 S D R値在2 %以下較佳，可獲得良好再生資訊。衝程的 目標値爲3 0 %以下 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） I ------11^------ (請先閲讀背面之注意事項再填寫本頁) -14- 565832 A7 B7 五、發明説明（12) (表"I 記錄膜 ML段 單元長 記錄線 記錄部 軌道 凹槽 凸堤寬 SDR 串音 數 度 速度 分 間距 寬度 度 % % nm m/s nm nm nm 例1 相變化 8 600 9.6 L/G 2000 1000 1000 1.8 20 比較例1 相變化 8 600 9.6 G 1000 500 500 4.2 40 例2 色素 8 600 9.6 L/G 2000 1000 1000 1.5 22 比較例2 色素 8 600 9.6 G 1000 400 600 3.7 45 I--------- (請先閲讀背面之注意事項再填寫本頁) 經濟部智慧財產局員工消費合作社印製 在凹槽及凸紋具有記錄層的圓盤形光記錄媒體，將照 時間或照射力變換爲五階段以上加以照射，以便在前記凹 槽及凸紋雙方進行多階記錄的方法，實現可在記錄層反射 率變化的深度方向達成五階段以上的多階記錄。 【圖面之簡要說明】 【第1圖】本發明實施形態例之光記錄媒體主要部位 之局部剖面立體圖。 【第2圖】在該光記錄媒體以雷射光束記錄資料時之 光記錄裝置立體圖。 【第3圖】以光記錄媒體在記錄層形成記錄記號時， 該記錄記號與假想記錄單元及其光反射率關係之模式圖。 【第4圖】照射假想記錄單元之雷射光束改用其他形 狀時之立體略圖。 本紙張尺度適用中國國家標準（CNS ) Α4規格（210X297公釐） -15- 565832 經濟部智慧財產局員工消費合作社印製 A7 B7五、發明説明（13) 主要元件對照表 1◦:圓盤形光記錄媒體 1 2 :記錄層 1 4 :基板 1 6 :凹槽 1 7 :凸紋 1 8 :反射膜 2〇：保護層 3 0 :光記錄裝置 3 1 :軸伺服機 3 2 :軸馬達 3 6 :雷射 3 8 :雷射驅動機 4 0 :假想記錄單元 4 2 A :物鏡 4 2 B :半形鏡 4 2 C :光束整形稜鏡 4 4 :聚焦跟踪伺服機 4 6 :送進伺服機 4 8 A〜G :記錄標記 4 9 :記錄標記 5〇：控制裝置 5 4 :已記錄之記錄標記 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） (請先閱讀背面之注意事項再填寫本頁) -16- 565832 A7 B7五、發明説明（14) 坑 凹 部設 壁預 槽紋 凹凸 A B 6 6 5 5 --------- (請先閲讀背面之注意事項再填寫本頁) 、1T, 經濟部智慧財產局員工消費合作社印製 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） -17-565832 A7 ___B7_ V. Description of the invention (j) [Technical field to which the invention belongs] (Please read the notes on the back before filling out this page) The present invention is based on the information provided for recording. One is a multi-stage optical recording medium and an optical recording method for irradiating an optical recording medium, and multi-level recording of preamble data. [Background of the Invention] In the conventional optical recording medium, the length of the reproduced signal (the length of the reflection signal modulation section) is converted in multiple stages to record data, while the depth of the reproduced signal (the degree of modulation of the reflected signal) is switched in multiple stages. There have been many studies on the method of recording plural data in each signal of the same length. This optical recording method is different from the two-field recording with or without recessed holes. It can make multiple recordings in the depth direction to increase the signal amount within a fixed length. Since the linear recording density can be improved, there are proposals for recording methods such as holograms and multiple recording layers. In this paper, multi-stage data records are achieved by varying the depth of the reflectivity, etc., and are called multi-stage records. In this kind of multi-level recording, in order to increase the recording density, it is necessary to shorten the recording mark printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs. However, when the recording mark is smaller than the beam diameter of the laser beam used for recording and reading, its multi-level recording Recording will be difficult. For example, 'Japanese Patent Application Laid-Open No. 010-1 3 4 3 5 3 describes how to adjust the amount of laser light for multi-level recording. For example, when the recording medium is a pigment film or a phase-change film, a regeneration signal is formed by a difference in reflection between a recorded portion and an unrecorded portion. Therefore, 'Zhang Kaiping No. 10—1 3 4 3 5 3's Zhang scale is applicable to the Chinese National Standard (CNS) (21GX297)] " -4- 565832 A7 B7 V. Description of the invention (2) (please first (Please read the notes on the back and fill in this page) The method 'is to use the relationship between the recorded and unrecorded parts, which is not suitable for multi-stage recording. More specifically, there is no intermediate state between recorded and unrecorded phase change films or pigmented films. In the past, multi-level recording can be achieved on pigmented films or phase change films by adjusting the amount of laser light. The main reason is to change the laser irradiation power to change the width of the recording mark. The collected light beam usually has a Gaussian distribution, but when the recording film is a pigment film or a phase change film ', recording is performed only at a portion exceeding a certain threshold. The change of the laser force 'changes the spot size of the recordable light-collecting beam and changes the width of the recording mark. However, when the recording mark length is shortened to be shorter than the diameter of the collecting beam in order to increase the recording density, it is not easy to achieve multi-stage recording by changing the mark width by modulation of laser force, especially multi-stage recording of five or more stages. In other words, the change of the reflection order during the regeneration is not easy to exceed five stages. Generally, the diameter of the collected light beam is represented by Kλ. / ΝΑ (K: constant, λ: laser wavelength, N A: number of lens apertures). For example, the pickup when the optical recording medium is CD (optical disc) is: I = 78 0 n m, NA = printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs. 0 · 4 5 The diameter is approximately 1 · 6 // m. At this time, if the record mark length is reduced to 1.6 β m or less, it is not easy to achieve a multi-level record of more than 5 stages by the conventional laser conversion method. As disclosed in Japanese Patent Application Laid-Open No. 1 1 8 2 8 4 6, when the incident light amount of the recording layer is supplied as a prime amount, the absorbance of the reactant of the recording layer also has an optical recording medium whose prime amount changes. However, it is speculated that for this optical recording medium, for the laser exposure (number of times), this paper size applies the Chinese National Standard (CNS) A4 specification (210X29 * 7 mm) -5- 565832 A7 B7 V. Description of the invention (3) Absolute change in absorbance is very small and is not practical. (Please read the precautions on the back before filling out this page.) Then, as disclosed in Japanese Patent Application Laid-Open No. 6 1-2 1 1 8 3 5, there is also a change in the intensity or number of irradiations of the color photographic material. An optical recording method for recording at different stages of color density. However, in this optical recording method, when reading with irradiated laser light, it is difficult to achieve a color density state of 5 or more steps. In order to increase the recording density, a so-called emboss-groove recording method is formed in which recording marks are formed on both sides of the ridges and grooves sandwiched by the ridges. Although this ridge-groove recording seems to double its recording area, the signal in the groove will be larger during overflow recording, and even overflow to ridges, resulting in missed talk and other shortcomings. In fact, it is not easy to greatly increase the recording density. [Explanation of the invention] In consideration of the above circumstances, the printing of employee cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs, the present invention provides a generally widely used disc shape such as CD-R, CD-RW, and achieves multi-stage by convex-groove recording. The multi-level recording can obtain an optical recording medium and an optical recording method with good signal quality. The purpose is to provide not only video image recording but also multi-level optical recording media and optical recording methods for external storage devices of computers. The inventor has studied the optical recording medium for many years and found a recording method for multi-stage recording. It is confirmed that using this recording method, it is possible to achieve ridge-groove recording for more than five stages on a disc-shaped optical recording medium. High-density multilevel recording. In other words, the above-mentioned objects can be achieved by the following invention. This paper size applies Chinese National Standard (CNS) A4 specification (210X297 mm) -6-565832 A7 B7 V. Description of invention (4) (Please read the precautions on the back before filling this page) (1) An optical recording medium , Which is a groove referenced by the laser beam guide, is sandwiched in a convex pattern arranged parallel to it, and is arranged in a concentric circle or spiral shape at a certain distance in the radial direction of the disk, and runs along the center of the disk. In the rotating state, a recording mark is formed on the recording layer according to the irradiation of the laser beam to record data, and a disc-shaped optical recording medium that reads the laser beam to read the data can be irradiated to the recording layer. A pre-recording layer is formed on the groove and the embossment. The pre-recording layer on the groove and the embossment is to continuously set a plurality of imaginary recording units in the unit length of the disk rotation direction and the unit width in the direction perpendicular to the unit. The pre-recorded recording layer of the imaginary recording unit can form recording marks of different sizes according to five or more stages of modulation corresponding to at least one of the irradiation time and the irradiation power of the laser beam. Means for modulating the recording area of the imaginary recording mark with a reflectance ratio of transmittance can be based at least in area ratio, and to achieve the above five-stage multi-stage record. (2) The optical recording medium according to (1), wherein the unit length of the pre-recorded imaginary recording unit is set to be approximately equal to the length of the recording mark formed by the laser beam with the maximum irradiation time. Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs (3) The optical recording medium as described in (1) or (2), wherein the hypothetical imaginary recording unit set in the groove of the preface is set to have the width of the preface unit approximately The groove widths are equal. (4) The optical recording medium according to any one of (1) or (2), in which the preceding unit width of an imaginary recording unit provided on the preceding relief is approximately equal to the width of the relief. (5) The optical recording medium described in any one of (1) or (2) applies to the Chinese paper standard (CNS) A4 specification (210X297 mm) 565832 A7 B7. 5. Description of the invention (5), where The preamble unit length of the preamble imaginary recording unit is set to be less than the diameter of the beam waist of the preamble reading laser beam. (6) The optical recording medium according to any one of (1) or (2), in which at least one piece of information that can be recorded on both the groove and embossment of the preamble and a multi-level recording medium is recorded in advance in a There are groove wobble, land pre-pit, and at least a part of a predetermined signal recording part of the sampling servo mechanism. (7) — A kind of optical recording method, which belongs to the groove referenced by the laser beam guide, is sandwiched in a convex pattern arranged parallel to it, and is arranged in a concentric circle or a certain distance in the radial direction of the disc. A spiral-shaped optical recording method that rotates a disc-shaped optical recording medium having a recording layer on a groove and a ridge of a preamble and irradiates a laser beam on the prerecord recording layer to form a recording mark on the recording layer to record data. : On the recording layer on the groove and embossment of the preamble, a plurality of imaginary units in which the unit length of the disc rotation direction and the unit width in the direction orthogonal to the unit are set in the disc rotation direction are plurally set, and each hypothetical record in the preamble is Unit, at least one of the irradiation time and irradiation power of the laser beam is modulated to more than five stages, and the size of the recording mark formed in the virtual recording unit is changed. The area ratio of the virtual recording unit and the transmittance of the recording mark are changed. At least according to the area ratio, the overall light reflectance of the imaginary recording unit can be modulated to achieve a multi-level recording method of more than five stages. Detailed description] The embodiments of the present invention will be described in detail below with reference to the drawings. This paper size applies Chinese National Standard (CNS) Α4 specification (210X297 mm) --------- (Please read the precautions on the back before filling this page) Order * System-8-565832 A7 B7 V. Description of the invention (6) (Please read the precautions on the back before filling out this page) Regarding the disc-shaped optical recording medium 10 according to the embodiment of the present invention, 1 is used for recording 1 2 CD-R or CD-RW of a phase change material is a substrate 14 made of a transparent base material, and a recess for covering and guiding the laser beam is provided on one side of the substrate 14 (upper in FIG. 1). The groove 16 and the embossment 17 parallel to the recording layer 12 are described in advance, and a reflective film 18 such as gold or silver is formed on the upper side of the recording layer 12 by sputtering or the like, and covers the outside of the reflective film 18 The protective layer 20 is formed. When the optical recording medium 10 is a CD-RW, it includes at least a lower protective layer (dielectric layer) formed by covering the grooves 16 and ridges with a film, a recording layer composed of a phase change material, and an upper protective layer (dielectric Body layer), a light reflecting layer, and a protective layer 20 covering these. The groove 16 in the previous note is a concentric circle or spiral with a disc-shaped center, continuous and formed at equal intervals in the radial direction, and between the grooves 16 adjacent to the radial direction, parallel to the concentric circle The ridges or spirals continuously form ridges 17. The pigments used by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs for the pre-recording layer 12 are cyanine, merocyanine, methene-based pigments and their derivatives, and phenylthiol ( Organic pigments such as benzenethiol) metal complexes, phtalocyanine pigments, naphthalocya gateine pigments, and azo (a ζ) pigments. GeSbTe-based and AglnSbTe-based phase change materials are generally used. Multi-level recording of the pre-recorded optical recording medium 10 is performed by the optical recording device 30 shown in FIG. This optical recording device 30 is a CD-R / RW recorder. The size of the paper is adapted to the Chinese National Standard (CNS) A4 (210X297 mm) -9-565832 A7 B7 V. Description of the invention (7) (please Read the precautions on the back before filling in this page.) Service 3 1 Shaft motor 3 2 The optical recording medium (disk) 1 〇 Rotate and drive at a certain linear speed or a certain angular speed, and the laser beam from the laser 3 6 at 1 2 optical recording medium (magnetic disk) 10, and the recording layer 12 formed in the foregoing manner records data. The above-mentioned laser 3 6 can correspond to the recorded data (information), and the laser driver 3 8 controls each of the laser beam irradiation times of the hypothetical recording unit shown in Figs. (E.g. number of laser pulses) or laser beam power (e.g. laser pulse height or density). The compilation 4 of the second figure is a recording optical system including an objective lens 4 2 A and a half mirror (half m rr rr) 4 2 B. The objective lens 4 2 A is controlled by a focus tracking servo 4 4 to focus the laser beam on the recording layer 12. The objective lens 4 2 A and the half mirror 4 2 B are controlled by a feed servo to rotate synchronously with the disk 10, and move from the inside to the outside at a specified speed. The former spoke servo 3 1, laser drive 3 8, focus tracking servo 4 4, and feed servo 46 are controlled by the control device 50. The data to be recorded in the recording layer 12 is input to the control device 50. Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs The following describes the imaginary record unit 40 and the record mark recorded in the imaginary record unit 40. This imaginary recording unit 40 specifies a unit width in the diameter direction of the recording medium and a unit length in the rotation direction. The unit width is less than the diameter of the beam converging portion of the laser beam in the innermost part, and the track pitch and groove width of the magnetic disk 10 can be arbitrarily selected. The imaginary recording unit 40 of this embodiment example is specifically expressed as the first paper size applicable to the Chinese National Standard (CNS) A4 specification (210X297 mm) -10- 565832 A 7 B7 V. Description of the invention (8) Figure 'Along With the groove 16 and the ridge 17 in front, set the unit length and set the width approximately equal to the groove 16 and the ridge on the recording layer 12 in the rotation direction of the magnetic disk 10, that is, the circumferential direction. 1 7. Continuously conceived in a spiral or concentric circle shape. These imaginary recording units 40 are irradiated with a laser beam, and according to the data to be recorded, recording mark patterns 4 8 A to 4 8 G are formed as shown in FIG. 3. At this time, 'the beam diameter D of the laser beam emitted by the previous laser 36 on the recording layer 12 is set to be larger than the width of the previous imaginary recording unit 40', but according to the material selected for the recording layer 12 in the laser, The central part of the beam of light changes the laser irradiation time or irradiation power to form recording marks of different diameters 4 8A to 4 8 G (the laser beam is circular, but it is illuminated by rotating the optical recording medium 10, so the recording marks follow Becomes oblong) ° because the focused laser beam has a Gaussian distribution in the normal state, but the irradiation energy of the laser beam exceeds a certain threshold value before it is recorded. Therefore, the irradiation time or irradiation power can be changed so that The laser beam that can be recorded in the recording layer 12 changes its size, so that the seven-stage recording marks 4 8 A to 4 8 G can be formed as shown in FIG. 3. At this time, the size of each of the recording marks 4 8 A to 4 8 G is set such that when the read laser beam is irradiated on the hypothetical recording unit 40, the reflectance of the reflected light thereof also forms seven stages. The reflectance of the pre-recorded light is inversely proportional to the size of the recording mark. The reflectance of the imaginary unit without the recording mark is large, and the reflectance of the imaginary recording unit formed by the largest recording mark 4 8 G is the smallest. This paper size applies to China National Standard (CNS) A4 specification (210X297 mm) II -------- ^-(Please read the precautions on the back before filling this page), τ # 1. Ministry of Economy Wisdom Printed by the Consumer Affairs Cooperative of the Property Bureau -11-565832 A7 _____B7_ V. Description of the invention (9) More precisely, the light reflectance in the previous note needs to consider each record mark 4 8 A ~ 4 8 G for the area ratio of the hypothetical record unit 40. And the transmittance of the recording mark is set. The light transmittance of the recording target is 4 8 A to 4 8 G. The material constituting the recording layer 12 is decomposed and deteriorated by the irradiation of the laser beam, changes the crystalline state, or changes the thickness of the recording layer 12. Causes a change in refractive index. Unless the transmittance of the recorded mark portion is zero, it needs to be considered. As mentioned above, the hypothetical recording unit 40 is provided on the groove 16 and the ridge 17, but when the pigment recording layer is used, the thickness of the recording layer 12 on the groove 16 is larger than that of the ridge 17 The top is thick. Therefore, it is appropriate that the standard irradiation time or the standard irradiation power of the laser beam when the groove 16 and the relief 17 are recorded is different. If the recording layer 12 has a sufficient thickness and the difference in the size and transmittance of the recording mark formed by the irradiation time or irradiation power of the laser beam is not large, it may not be necessary to set the standard irradiation time or standard irradiation power as described above. Difference 0 The unit length of the imaginary recording unit 40 can be set as the longest irradiation time of the laser beam, and the irradiation energy thereof is a recording mark formed when the threshold value of the recording layer 12 changes, which may be approximately the same length. As explained below, if the size of the laser beam in the length direction of the virtual recording unit 40 is reduced, the unit length of the virtual recording unit 40 at the outermost side of the disk radius in the recording medium 10 can be changed to less than Convergent diameter of laser beam. The laser beam in the previous note is circular at the position of the recording layer 12, but if the paper size is the same as the Chinese National Standard (CNS) A4 (210X297 mm) si — --1:-I----- ---1 · -n (Please read the precautions on the back before filling out this page)-1 < ",-口 · f Printed by the Consumers' Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs-12- 565832 A7 B7 V. Description of the invention (10) (Please read the precautions on the back before filling in this page) As shown in the figure below, 'Add beam shaping to the objective lens 4 2 A 稜鏡 4 2 C or use a small hole (not labeled) to change the beam shape to The rotation direction is short, and the oval or line shape that is longer in the direction orthogonal to it may be used. At this time, the recording title 4 becomes shorter and the imaginary recording unit becomes shorter. In other words, the recording density can be increased. In the above embodiment, CD-R is used as the optical recording medium 10, but the present invention is not limited to this, and can be generally applied to other optical recording media. In the above embodiment, the recording layer 1 2 is an organic pigment or a phase change material such as blue pigment. However, the present invention is not limited to this. As long as it corresponds to the irradiation time of the laser beam, it can be formed in five steps or more. The recording mark may be a recording layer other than the above. However, when using the above-mentioned organic pigments, it is possible to reliably record the size of the recording mark in accordance with the irradiation time of five stages or more of the laser beam. Furthermore, the above-mentioned embodiment is an optical recording medium 1 in which no data is recorded, but the present invention is not limited to this, and it is also applicable to a reproduction-only optical recording medium in which data of five stages or more can be recorded in multiple stages. Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs, this optical recording medium 10 has a pre-signal recording unit (for details, described later) that identifies the information of each recording medium to identify the multi-level recording optical recording medium and / or convex The information of the optical recording medium for the groove-groove recording determines the specific information such as the information of the laser beam force of each recording medium. The specific information is read in during the reproduction and / or recording of each optical recording medium to identify the optical recording medium for multi-level recording, and the information can be identified separately, or the mine can be determined according to the number of pit segments that are pre-recorded. The number of segments of the beam power, this paper size applies the Chinese National Standard (CNS) A4 specification (210X297 mm) -13- 565832 Printed by the Consumers ’Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs A7 B7 5. The invention description (彳 彳) is more accurate Multi-level recording reproduction is performed. The pre-signaling part is to use the groove wall part 5 6 A, the embossed preset recess 5 6 B, and the sampling servo mechanism 'separately or in combination. However, the present invention also utilizes the embossing as a recording field, and therefore it is preferable that the pits are not preset to use. Sampling servo means a plurality of pits with different reflectances preset in accordance with the number of signal modulation sections, or a part of each of the optical recording media ', as previously described, a recording mark of a recorded multi-level recording is set as a multi-level recording 5 4 ° (Example) The following is a description of examples of the present invention and comparative examples. Using CD D-R W using phase change materials and CD D-R using pigments as recording media 10, the recording time was modulated to perform an eight-stage multi-level recording experiment. The experimental results are shown in Table 1. S D R in the table is the signal deviation of each stage obtained from the reflectance and dynamic range of each stage of the multi-stage. L / G is relief-groove recording, and G is groove recording. According to the experiments of the present inventors, this S D R 値 is preferably below 2%, and good regeneration information can be obtained. The target of stroke is below 30%. This paper size is applicable to China National Standard (CNS) A4 specification (210X297mm) I ------ 11 ^ ------ (Please read the precautions on the back before Fill in this page) -14- 565832 A7 B7 V. Description of the invention (12) (Table " I Recording film ML segment unit long recording line recording section track groove convex bank width SDR crosstalk several degrees speed minute interval width degree%% nm m / s nm nm nm Example 1 Phase change 8 600 9.6 L / G 2000 1000 1000 1.8 20 Comparative Example 1 Phase change 8 600 9.6 G 1000 500 500 4.2 40 Example 2 Pigment 8 600 9.6 L / G 2000 1000 1000 1.5 22 Comparative Example 2 Pigment 8 600 9.6 G 1000 400 600 3.7 45 I --------- (Please read the notes on the back before filling out this page) The Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economy printed on the grooves and A disc-shaped optical recording medium having a embossed recording layer, which converts the irradiation time or irradiation power into more than five stages and irradiates it, so as to perform multi-level recording on both the groove and the embossed preface, and realize the reflectivity in the recording layer. The depth direction of the change reached a multi-level record of more than five stages. Brief description] [Fig. 1] A partial cross-sectional perspective view of a main part of an optical recording medium according to an embodiment of the present invention. [Fig. 2] A perspective view of an optical recording device when the optical recording medium records data with a laser beam. 3] When a recording mark is formed on the recording layer with an optical recording medium, a schematic diagram of the relationship between the recording mark and the virtual recording unit and its light reflectance. [Figure 4] When the laser beam irradiating the virtual recording unit is changed to another shape A three-dimensional sketch. This paper size is in accordance with the Chinese National Standard (CNS) A4 specification (210X297 mm) -15- 565832 Printed by A7 B7 of the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 5. Description of the invention (13) Comparison table of main components : Disk-shaped optical recording medium 1 2: Recording layer 1 4: Substrate 16: Groove 17: Relief 1 8: Reflective film 20: Protective layer 3 0: Optical recording device 3 1: Shaft servo 3 2 : Shaft motor 3 6: Laser 3 8: Laser driver 4 0: Virtual recording unit 4 2 A: Objective lens 4 2 B: Half mirror 4 2 C: Beam shaping unit 4 4: Focus tracking servo 4 6 : Feed servo 4 8 A ~ G: Record mark 4 9: Record mark 50: Control device 5 4: Recorded record mark This paper size is applicable to Chinese National Standard (CNS) A4 (210X297 mm) (Please read the precautions on the back before filling this page) B7 V. Description of the invention (14) Pre-grooves on the wall of the pits and recesses AB 6 6 5 5 --------- (Please read the precautions on the back before filling this page), 1T, Intellectual Property of the Ministry of Economic Affairs The paper size printed by the Bureau ’s Consumer Cooperative is applicable to the Chinese National Standard (CNS) A4 (210X297 mm) -17-