JPH10505188A - 光学的情報記録媒体、その製造方法、その製造装置及び光学的情報記録再生装置 - Google Patents
光学的情報記録媒体、その製造方法、その製造装置及び光学的情報記録再生装置Info
- Publication number
- JPH10505188A JPH10505188A JP8530195A JP53019596A JPH10505188A JP H10505188 A JPH10505188 A JP H10505188A JP 8530195 A JP8530195 A JP 8530195A JP 53019596 A JP53019596 A JP 53019596A JP H10505188 A JPH10505188 A JP H10505188A
- Authority
- JP
- Japan
- Prior art keywords
- information
- substrate
- layer
- recording medium
- information recording
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
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- B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
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- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
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- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
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- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B7/0908—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for focusing only
- G11B7/0912—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for focusing only by push-pull method
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B7/0908—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for focusing only
- G11B7/0916—Foucault or knife-edge methods
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B7/094—Methods and circuits for servo offset compensation
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- G11—INFORMATION STORAGE
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- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B7/0941—Methods and circuits for servo gain or phase compensation during operation
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
- G11B7/243—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising inorganic materials only, e.g. ablative layers
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
- G11B7/244—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising organic materials only
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
- G11B7/254—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of protective topcoat layers
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
- G11B7/256—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers improving adhesion between layers
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Electromagnetism (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Fluid Mechanics (AREA)
- Optical Record Carriers And Manufacture Thereof (AREA)
- Optical Recording Or Reproduction (AREA)
- Manufacturing Optical Record Carriers (AREA)
Abstract
Description
Claims (1)
- 【特許請求の範囲】 1. 2つの異なる情報層を備え、光ビームの照射によって前記情報層から情報 信号を再生し、又は前記情報層に情報信号を記録し、記録した情報信号を再生す ることが可能な光学的情報記録媒体であって、片側の表面に情報信号に対応した 情報ピット、トラッキング用のガイド溝及びサンプルピットからなる群から選ば れる少なくとも1つが形成された第1の基板と、前記第1の基板の片側の表面に 成膜され、前記光ビームに対して所定の透過率と所定の反射率を有する第1の情 報層と、片側の表面に情報信号に対応した情報ピット、トラッキング用のガイド 溝及びサンプルピットからなる群から選ばれる少なくとも1つが形成された第2 の基板と、前記第2の基板の片側の表面に成膜され、所定の反射率を有する第2 の情報層と、前記第1の情報層と前記第2の情報層との間に介在され、前記光ビ ームに対して透明な分離層とを備えたことを特徴とする光学的情報記録媒体。 2. 第1の基板の厚さが第2の基板の厚さと実質的に等しい請求項1に記載の 光学的情報記録媒体。 3. 情報を再生する光の波長に対する第1の情報層の反射率をR1、第1の情 報層の吸収率をA1、第2の情報層の反射率をR2としたとき、下記の式が成立 する請求項1に記載の光学的情報記録媒体。 R1≒1−A1+(2・R2)-1 −{[1−A1+(2・R2)-1]2−(1−A1)2}0.5 4. 第1の情報層の反射率が25〜40%である請求項1に記載の光学的情報 記録媒体。 5. 第2の情報層が、第2の基板上に順次積層された反射層、第1の誘電体層 、記録層、第2の誘電体層からなる請求項1に記載の光学的情報記録媒体。 6. 第1の情報層が、光ビームに対し吸収係数が実質的にゼロである請求項1 に記載の光学的情報記録媒体。 7. 第1の情報層が、少なくとも2層の薄膜からなる請求項1に記載の光学的 情報記録媒体。 8. 第1の情報層が、第1の基板上に順次積層された第1の誘電体層、記録層 、第2の誘電体層からなる請求項7に記載の光学的情報記録媒体。 9. 第1及び第2の情報層がともに各表面に情報信号に対応した情報ピットを 備えている請求項1に記載の光学的情報記録媒体。 10. 第1の情報層が再生専用型であり、第2の情報層が記録再生型である請 求項1に記載の光学的情報記録媒体。 11. 分離層の厚さが、光ビームを集光する光学系の焦点深度よりも大きく、 かつ前記光学系の許容する基材厚公差よりも小さい請求項1に記載の光学的情報 記録媒体。 12. 第1及び第2の基板の表面に情報ピット又はサンプルピットが形成され 、前記第1の基板に形成されたピットの形状が、前記第2の基板に形成されたピ ットの形状と異なる請求項1に記載の光学的情報記録媒体。 13. 第2の基板に形成されたピットのピット幅が、第1の基板に形成された ピットのピット幅よりも大きい請求項12に記載の光学的情報記録媒体。 14. 第1及び第2の基板の表面にガイド溝が形成され、前記第2の基板に形 成されたガイド溝の溝幅が、前記第1の基板に形成されたガイド溝の溝幅よりも 大きい請求項1に記載の光学的情報記録媒体。 15. 第1及び第2の基板の表面に情報ピットが形成され、前記第2の基板に 形成された情報ピットの単位面積当たりの密度が、前記第1の基板に形成された 情報ピットの単位面積当たりの密度よりも小さい請求項1に記載の光学的情報記 録媒体。 16. 第1及び第2の基板の表面にサンプルピット又はガイド溝が形成され、 前記第2の基板に形成されたサンプルピット又はガイド溝のトラックピッチが、 前記第1の基板に形成されたサンプルピット又はガイド溝のトラックピッチより も小さい請求項1に記載の光学的情報記録媒体。 17. 第1及び第2の基板の表面に情報ピット又はサンプルピットが形成され 、前記第1の基板と前記第2の基板で光ビームの入射側から見た情報ピットの向 きが逆である請求項1に記載の光学的情報記録媒体。 18. 第1及び第2の基板の表面に形成された情報ピット、ガイド溝又はサン プルピットが前記第1及び第2の基板の中心部を中心とした渦巻き状であり、か つ前記第1の基板の渦巻きの形状と前記第2の基板の渦巻きの形状が光ビームの 入射側から見て同一である請求項1に記載の光学的情報記録媒体。 19. 請求項1に記載の光学的情報記録媒体を一対備え、さらに接着層を備え 、前記一対の光学的情報記録媒体の第2の基板同士が前記接着層を介して接着さ れた光学的情報記録媒体。 20. 一対の光学的情報記録媒体の第1の基板同士の厚さが実質的に等しく、 前記一対の光学的情報記録媒体の第2の基板同士の厚さが実質的に等しい請求項 19に記載の光学的情報記録媒体。 21. 2つの異なる情報層を備え、光ビームの照射によって前記情報層から情 報信号を再生し、又は前記情報層に情報信号を記録し、記録した情報信号を再生 することが可能な光学的情報記録媒体の製造方法であって、片側の表面に情報信 号に対応した情報ピット、トラッキング用のガイド溝及びサンプルピットからな る群から選ばれる少なくとも1つが形成された第1の基板上に、前記光ビームに 対して所定の透過率と所定の反射率を有する第1の情報層を成膜する第1の成膜 工程と、片側の表面に情報信号に対応した情報ピット、トラッキング用のガイド 溝及びサンプルピットからなる群から選ばれる少なくとも1つが形成された第2 の基板上に、所定の反射率を有する第2の情報層を成膜する第2の成膜工程と、 前記第1又は第2の情報層の上に、前記光ビームに対して透明な樹脂層を塗布す る塗布工程と、前記第1の情報層と前記第2の情報層を対向させ、かつ前記樹脂 層を介して両者を接着する接着工程とからなる光学的情報記録媒体の製造方法。 22. 第1の基板の厚さが第2の基板の厚さと実質的に等しい請求項21に記 載の光学的情報記録媒体の製造方法。 23. 第1の基板と第2の基板の両側から加圧する加圧工程がさらに備わった 請求項21に記載の光学的情報記録媒体の製造方法。 24. 樹脂層として光硬化性の樹脂を用い、第1の基板と第2の基板の両側か ら加圧しながら、前記第1の基板側から前記樹脂層を硬化するための光照射を行 う請求項21に記載の光学的情報記録媒体の製造方法。 25. 請求項21に記載の光学的情報記録媒体の製造方法によって得られた一 対の光学的情報記録媒体の一方の第2の基板上に、光ビームに対して透明な接着 層を塗布する塗布工程と、前記一対の光学的情報記録媒体の第2の基板同士を対 向させ、かつ前記樹脂層を介して両者を接着する接着工程とがさらに備わった光 学的情報記録媒体の製造方法。 26. 一対の光学的情報記録媒体の第1の基板同士の厚さが実質的に等しく、 前記一対の光学的情報記録媒体の第2の基板同士の厚さが実質的に等しい請求項 25に記載の光学的情報記録媒体の製造方法。 27. 第1の基板を支持する第1の基板支持部と、前記第1の基板支持部と対 向して配置され、第2の基板を支持する第2の基板支持部と、前記第1又は第2 の基板の上に樹脂層を塗布する塗布部と、前記第1の基板支持部と第2の基板支 持部の対向した面上で、かつ前記第1及び第2の基板よりも外側に配置されたス ペーサと、前記第1又は第2の基板支持部を昇降し、かつ前記第1の基板と前記 第2の基板を加圧する加圧部とを備えた光学的情報記録媒体の製造装置。 28. 第1の基板支持部の第1の基板との接触面の反対側に位置した光源がさ らに備わり、前記第1の基板支持部は前記光源からの光の一部を透過する材料か らなる請求項27に記載の光学的情報記録媒体の製造装置。 29. 第1及び第2の基板はともに、中心部に中心孔を備え、かつ片側の表面 に同心円状又は渦巻き状の情報ピット列又はガイド溝を備え、第1又は第2の基 板支持部の少なくとも一方に、前記第1の基板と前記第2の基板の情報ピット列 又はガイド溝の中心軸をほぼ一致させるための中心位置補正部がさらに備わった 請求項27に記載の光学的情報記録媒体の製造装置。 30. 第1及び第2の基板支持部の中心軸上にそれぞれ設けられた第1及び第 2のシャフト部と、一方の端が基板の中心孔よりも大きく他方の端が前記基板の 中心孔よりも小さいテーパー部を有し、かつそれぞれ前記第1及び第2のシャフ ト部に沿って移動可能な第1及び第2の内径案内部とがさらに備わった請求項2 7に記載の光学的情報記録媒体の製造装置。 31. 第1及び第2のシャフト部のいずれか一方の先端部に凸状のテーパー部 が形成され、他方の先端部に凹状のテーパー部が形成された請求項30に記載の 光学的情報記録媒体の製造装置。 32. 情報信号に対応した情報ピット、トラッキング用のガイド溝及びサンプ ルピットからなる群から選ばれる少なくとも1つを有する少なくとも2つの異な る情報層を備えた光学的情報記録媒体に光を照射することにより、前記情報層か ら情報信号を再生し、又は前記情報層に情報信号を記録し、記録した情報信号を 再生することが可能な光学的情報記録再生装置であって、光源から出射した光ビ ームを対物レンズを用いて前記記録媒体上に集光する光学手段と、前記光ビーム の焦点位置を前記情報層のいずれかに一致させる制御を行うフォーカス制御手段 と、前記情報ピット、ガイド溝又はサンプルピットを前記光ビームが追従するよ うに、光ビーム位置を制御するトラッキング制御手段と、前記情報ピットからの 反射光又は透過光に基づいて前記情報層の識別信号を復調する層識別手段と、前 記情報信号の再生又は記録を行う情報層を選択する層選択手段と、前記層選択手 段の選択結果に対応して前記トラッキング制御手段のトラッキング方式を切り換 える切り換え手段とを備えたことを特徴とする光学的情報記録再生装置。 33. 層選択手段の選択結果と層識別手段の識別結果を比較する層比較手段と 、前記層比較手段の出力に対応して前記光ビームの焦点位置を前記情報層間で移 動させるためのパルス電圧を発生するフォーカスジャンプ回路とがさらに備わっ た請求項32に記載の光学的情報記録再生装置。 34. フォーカスジャンプ回路の動作と同期してトラッキング制御手段の極性 を切り換えるトラッキング極性反転手段がさらに備わった請求項33に記載の光 学的情報記録再生装置。 35. フォーカス制御手段が、光ビームの焦点位置を情報層の近傍に一致させ る制御を行う第1のフォーカス制御手段と、前記第1のフォーカス制御手段より も動作範囲の狭い第2のフォーカス制御手段と、前記第1のフォーカス制御手段 の動作が完了した後に前記第2のフォーカス制御手段に切り換えるフォーカス切 り換え手段とからなる請求項32に記載の光学的情報記録再生装置。 36. フォーカス制御手段が、各情報層に対応するために少なくとも2種類の 動作条件を備え、層選択手段の選択結果に従って前記動作条件の1つを選択する 請求項32に記載の光学的情報記録再生装置。 37. トラッキング制御手段が、各情報層に対応するために少なくとも2種類 の動作条件を備え、層選択手段の選択結果に従って前記動作条件の1つを選択す る請求項32に記載の光学的情報記録再生装置。 38. 光ビームのフォーカス制御を行うために、記録媒体からの反射光の一部 を受光する第1の分割受光面と、前記第1の分割受光面と同一平面上でかつ前記 第1の分割受光面の外側の領域で前記反射光を受光する第2の分割受光面とから なる光検出器がさらに備わった請求項32に記載の光学的情報記録再生装置。
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JP3210549B2 (ja) * | 1995-05-17 | 2001-09-17 | 日本コロムビア株式会社 | 光情報記録媒体 |
US5555537A (en) * | 1995-06-30 | 1996-09-10 | International Business Machines Corporation | Optical data storage system with multiple write-once phase-change recording layers |
JPH0991700A (ja) * | 1995-09-25 | 1997-04-04 | Sony Corp | 光学記録媒体の初期化方法とこれに用いる初期化装置 |
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- 1996-04-08 SG SG1997004441A patent/SG74605A1/en unknown
- 1996-04-08 WO PCT/JP1996/000973 patent/WO1996031875A2/en active IP Right Grant
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US6469977B2 (en) | 1999-12-20 | 2002-10-22 | Matsushita Electric Industrial Co., Ltd. | Optical information recording medium, method for producing the same, and method and apparatus for recording/reproducing information thereon |
US8149667B2 (en) | 2000-06-29 | 2012-04-03 | Samsung Electronics Co., Ltd. | Optical recording medium having read-only storage area and writable storage area and recording/reproducing apparatus and method therefor |
US8411541B2 (en) | 2000-06-29 | 2013-04-02 | Samsung Electronics Co., Ltd. | Optical recording medium having read-only storage area and writable storage area and recording/reproducing apparatus and method therefor |
JP4509431B2 (ja) * | 2000-07-13 | 2010-07-21 | パナソニック株式会社 | 情報記録媒体 |
JP2003016687A (ja) * | 2000-07-13 | 2003-01-17 | Matsushita Electric Ind Co Ltd | 情報記録媒体およびその製造方法ならびにそれを用いた記録再生方法 |
US6610380B2 (en) | 2000-08-17 | 2003-08-26 | Matsushita Electric Industrial Co., Ltd. | Optical information recording medium, manufacturing method, recording and reproduction method, and recording/reproduction device |
US6768710B2 (en) * | 2000-12-18 | 2004-07-27 | Matsushita Electric Industrial Co., Ltd. | Optical information recording medium, method for producing the same, and method and apparatus for recording information thereon |
US6956809B2 (en) | 2001-03-23 | 2005-10-18 | Sony Corporation | Multilayer phase-change type optical disc capable of recording and reproducing information at high transfer rate |
US7485355B2 (en) | 2002-10-01 | 2009-02-03 | Panasonic Corporation | Optical information recording medium and method for manufacturing the same |
WO2004055790A1 (ja) * | 2002-12-17 | 2004-07-01 | Mitsubishi Chemical Corporation | 光記録媒体、光記録媒体の記録再生方法及び記録再生装置 |
US7801000B2 (en) | 2002-12-17 | 2010-09-21 | Mitsubishi Kagaku Media Co., Ltd. | Recording/reading method for an optical recording medium using an irradiating a laser beam |
WO2004093070A1 (ja) * | 2003-04-14 | 2004-10-28 | Mitsubishi Chemical Corporation | 光記録媒体及びその記録再生方法 |
US7907503B2 (en) | 2003-04-14 | 2011-03-15 | Mitsubishi Kagaku Media Co., Ltd. | Optical recording medium and recording/reading method therefor |
US7672215B2 (en) | 2003-04-14 | 2010-03-02 | Mitsubishi Kagaku Media Co., Ltd. | Optical recording medium and recording/reading method therefor |
WO2005015550A1 (ja) * | 2003-08-07 | 2005-02-17 | Ricoh Company, Ltd. | 光情報記録媒体及びその記録再生装置 |
US7464390B2 (en) | 2003-08-07 | 2008-12-09 | Ricoh Company, Ltd. | Optical information recording medium, and recording and reproducing apparatus of the same |
CN100414617C (zh) * | 2003-08-07 | 2008-08-27 | 株式会社理光 | 光信息记录媒体 |
WO2007043281A1 (ja) * | 2005-10-14 | 2007-04-19 | Hitachi Maxell, Ltd. | 光情報記録媒体 |
WO2010061457A1 (ja) * | 2008-11-27 | 2010-06-03 | パイオニア株式会社 | 記録媒体、記録再生装置及び方法、並びにコンピュータプログラム |
WO2020090369A1 (ja) * | 2018-10-30 | 2020-05-07 | ソニー株式会社 | 描画方法および消去方法 |
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