JP4199059B2

JP4199059B2 - Recording / reproducing apparatus and stabilization adjustment method

Info

Publication number: JP4199059B2
Application number: JP2003196241A
Authority: JP
Inventors: 康知阿萬; 伸晃小名木; 省蔵村田
Original assignee: Ricoh Co Ltd
Current assignee: Ricoh Co Ltd
Priority date: 2003-07-14
Filing date: 2003-07-14
Publication date: 2008-12-17
Anticipated expiration: 2023-07-14
Also published as: JP2005032344A

Description

【０００１】
【発明の属する技術分野】
本発明は、可撓性を有する記録ディスクに対して記録および／または再生処理を行う記録／再生装置、およびその記録／再生装置に適用される安定化調整方法に関するものである。
【０００２】
【従来の技術】
近年、テレビ放送のデジタル化が始まるなど、大容量のデジタルデータを記録することが情報記録媒体に求められている。例えば、光ディスクの分野においては、記録／再生のために光ディスクに集光される光スポット径を小さくすることが、高密度化のための基本的な方法の一つに挙げられる（以下、光ディスクを代表として説明するが、本発明が対象とする記録／再生装置に用いられる記録ディスクは、相変化メモリ，光磁気メモリ，ホログラムメモリなどのディスク状の記録ディスクで活用するものすべてを対象にし、特に光ディスクに限定するものではない）。
【０００３】
このため、光ディスクの高密度化においては、記録／再生のために用いられる光の波長を短く、かつ対物レンズの開口数ＮＡを大きくすることが有効である。光の波長についてはＣＤ（ｃｏｍｐａｃｔｄｉｓｋ）では近赤外光の７８０ｎｍ、ＤＶＤ（ｄｉｇｉｔａｌｖｅｒｓａｔｉｌｅｄｉｓｋ）では赤色光の６５０ｎｍ近傍の波長が用いられている。最近、青紫光の半導体レーザが開発され、今後は４００ｎｍ近傍のレーザ光が使用されると予想される。
【０００４】
また、対物レンズについては、ＣＤ用はＮＡ０．５未満であったが、ＤＶＤ用はＮＡ０．６程度である。今後、さらに開口数（ＮＡ）を大きくしてＮＡ０．７以上とすることが求められる。しかし、対物レンズのＮＡを大きくすること、および光の波長を短くすることは、光を絞るときに収差の影響が大きくなることでもある。したがって、光ディスクのチルトに対するマージンが減ることになる。また、ＮＡを大きくすることによって焦点深度が小さくなるため、フォーカスサーボ精度を上げなくてはならない。
【０００５】
さらに、高ＮＡの対物レンズを使用することによって、対物レンズと光ディスクの記録面との距離が小さくなってしまうため、光ディスクの面ぶれを小さくしておかないと、始動時のフォーカスサーボを引き込む直前、対物レンズと光ディスクとが衝突することがあり、ピックアップの故障の原因となる。
【０００６】
短波長，高ＮＡの大容量光ディスクとして、例えば非特許文献１に記載されているように、ＣＤと同程度に厚く、かつ剛性の大きい基板に記録膜を成膜し、記録／再生用の光を基板を通さずに、薄いカバー層内を通して記録膜に対して記録／再生する構成のシステムが提案されている。
【０００７】
また、特許文献１〜３，非特許文献１には、ベルヌーイの法則による空気力学的作用力を利用して光ディスクにおける面ぶれを安定化させるため、安定化部材に対向させて可撓性を有する光ディスクを回転させる構成の記録／再生装置、あるいは可撓性を有する光ディスクの構成などについての記載がある。
【０００８】
【特許文献１】
特開平７−１０５６５７号公報
【０００９】
【特許文献２】
特開平１０−３０８０５９号公報
【００１０】
【特許文献３】
特開２００３−１１５１０８号公報
【００１１】
【非特許文献１】
「オプティカル・リードアウト・オブ・ビデオディスク」アイイーイーイー・トランザクション・オン・コンシューマー・エレクトロニクス（“ＯＰＴＩＣＡＬＲＥＡＤＯＵＴＯＦＶＩＤＥＯＤＩＳＣ”，ＩＥＥＥＴＲＡＮＳＡＣＴＩＯＮＯＮＣＯＮＳＵＭＥＲＥＬＥＣＴＲＯＮＩＣＳ），１９７６年１１月、Ｐ．３０４−３０８
【００１２】
【発明が解決しようとする課題】
しかしながら、前記従来の技術において、光ディスクの基板を剛体で形成すると、回転する光ディスクにおける面ぶれ，チルトを小さくするためには、きわめて正確な成形をし、かつ熱変形が生じないように低温で記録膜を成膜しなければならない。このことは、光ディスク製造に係るタクトタイムを長くすることになり、コストを上げる原因となる。
【００１３】
また、特許文献１，２に記載されているように可撓性のある光ディスクを安定板上で回転させる方法では、光ディスクと安定化板が接して摺動する危険性が高く、ディスク面あるいは安定化板面が傷ついてしまうという問題がある。この摺動により、発塵を引き起こして、その塵埃などがエラーを発生させる原因となる。
【００１４】
特に特許文献１に記載されているように、安定化板側に記録膜が存在する構成であると、摺動により光ディスクの記録膜を損傷して、直接エラーを引き起こすことになる。また、単に平面状の安定化板を用いただけでは、ディスク面振れの低減効果にも限界があり、高ＮＡの対物レンズを使用する際に、対物レンズとディスクが衝突する危険性は未だ問題として残されたままである。
【００１５】
安定化板を用いる方法の一つとして、非特許文献１に記載されているような方法もあるが、平面上の安定化板を用いるという構成の点では前記技術と同じであり、同様の問題が生じることが予想される。また、この方法においては、「ｓｍｏｏｔｈｉｎｇｐｌａｔｅｓ」と称される安定化板とディスクの間に空気力学的な力が働くことが前提となっているが、例えば、ディスクがこの安定化板から離れる方向に反った形状である場合には、この空気力学的な力が有効に作用せず、ディスク面ぶれを制御することはできなくなる。また、この空気力学的な力の発現には、重力によってディスクが垂れる現象も利用しているため、ドライブ装置の縦置きなどには対応することができない。
【００１６】
これらの問題を解決するための１つの手段として、本発明者は、特許文献３などにおいて、光ディスクとの対向面が円弧状をなす円柱状の安定化ガイド部材を用い、光ディスクにおける安定化ガイド部材による空気圧の作用による面ぶれが安定する部位におけるディスク回転方向上流側と下流側とに空気圧の作用を生じさせない領域（安定化ガイド部材がない空間部）を設けて、面ぶれを安定化させた部位の前後位置に光ディスクに「逃げ」となる部分を存在させ、面ぶれを安定化させた部位での光ディスクにおける反発力を小さくすることにより、空気力による安定化力の効果を増大させる発明を提案した。
【００１７】
特許文献３の発明によれば、可撓性を有する光ディスクの面ぶれを確実に抑制し、高密度の記録を可能にし、また対物レンズとの摺接などの不具合の発生を防ぐことが可能となるが、反面、この実現においては、安定化ガイド部材と記録／再生ヘッドの複雑な位置調整制御が必要となるため、ドライブ制御系の負荷が大きくなるばかりでなく、装置コストがかなり高価なものになってしまう。
【００１８】
そこで、このような問題を解決するための１つの手段として、本発明者は、特願２００３−１９０８７号にて、図１４〜図１６に示すような構成の記録／再生装置を提案した。
【００１９】
図１４は記録／再生装置の要部の平面図、図１５は図１４におけるＥ−Ｅ’線断面図、図１６は図１４における記録／再生装置の正面図であり、１は可撓性を有する記録ディスクである光ディスク、２は光ディスク１の回転中心（中央）部分に装着された光ディスク１を回転させるために保持する一方の保持部材であるハブ、３は他方の保持部材であるチャッキング部をハブ２に嵌合して光ディスク１を回転駆動するスピンドルモータ、４は、光ディスク１の半径方向に移動して光ディスク１に対して光ビームを集光させ、情報の記録／再生処理を行うため光ディスク１に対して光走査（動線Ｒ方向）を行う記録／再生手段の光ピックアップである。
【００２０】
さらに、５は、光ピックアップ４と共に光ディスク１の半径方向に移動し、ベルヌーイの法則による空気力学的作用力を利用して、光ディスク１における少なくとも光ピックアップ４による記録／再生位置付近の光ディスクの面ぶれを抑制する主安定化部材、６は同様に光ディスク１に対して空気力学的作用力を作用させる補助安定化部材であって、主安定化部材５と補助安定化部材６とは光ディスク１の記録面とは反対側のディスク基板側に配設されている。
【００２１】
また補助安定化部材６は、本例では、光ディスク１の面内を光ピックアップ４が走査するために移動する動線Ｒと近接し、かつ光ディスク１の中心付近を通る直線（図では動線Ｒ上に記載したが、動線Ｒ近傍にあるものも含む）Ａによって分けた２つの領域Ｓ１，Ｓ２のそれぞれに、主安定化部材５に対して独立して１つずつ対称位置に配設されている。
【００２２】
このように光ピックアップ４付近に配設した主安定化部材５の他に、補助安定化部材６を前記のような特定位置に配設することによって、主安定化部材５が位置する光ディスク１において主安定化部材５に対向する作用力を発生させ、光ディスク１に対して主安定化部材５を大きく押し込まずとも空気力によるディスク面の面ぶれ安定化効果を得ることができる。
【００２３】
図１４〜図１６に示す構成の発明では、主安定化部材５を一つだけ用いた場合に比べて、主安定化部材５の押し込み量が浅い位置において十分な面ぶれ低減効果が得られ、これにより、主安定化部材５および光ピックアップ４におけるディスク半径方向の動線をディスク基準面に近い範囲に限定することができるため、動作機構の簡略化を図ることができる。
【００２４】
なお、図１４〜図１６において、２１は補助安定化部材６と光ディスク１の近接点（作用点）、２２は補助安定化部材６と光ディスク１の近接領域、２３は補助安定化部材６の作用面の中心を示している。
【００２５】
しかしながら、この発明において、例えば、光ディスク１との対向面が円弧状をなす円柱状の補助安定化部材６を用いた場合には、図１４に示すように、厳密にはその空気力学的な力の作用点２３が、補助安定化部材６と光ディスク１の近接点２１からずれ、補助安定化部材６による空気力学的な力が十分に作用しない場合が存在した。場合によっては、この現象は光ディスク１と補助安定化部材６との接触摺動を引き起こし、本装置における記録／再生の信頼性上の問題となる。
【００２６】
本発明の目的は、前記の課題を解決し、ベルヌーイ効果を作用させる主安定化部材と補助安定化部材との構成において、補助安定化部材による空気力学的な作用力を適正化して、良好なディスク面ぶれの低減を実現する記録／再生装置および安定化調整方法を提供することにある。
【００２７】
【課題を解決するための手段】
前記目的を達成するため、請求項１に記載の発明は、可撓性を有する記録ディスクを回転させ、ベルヌーイ効果を利用して少なくとも記録／再生位置付近における前記記録ディスクの面ぶれを抑制する主安定化部材と、前記記録ディスクの主たるベルヌーイ効果の作用面とは逆の面において記録および／または再生を行う記録／再生手段とを備え、前記記録ディスクの面内を、前記記録／再生手段が走査する動線に近接し、かつ該記録ディスクの中心付近を通る直線Ａによって２つの領域に分け、該２つの領域のそれぞれに、空気力学的な作用力を発生させて、前記主安定化部材が位置する前記記録ディスク面において前記主安定化部材に対向する作用力を発生させるように補助安定化部材を配設した記録／再生装置であって、前記両補助安定化部材における空気力学的な力の作用面を共に、ディスク半径方向に同一チルト角にて傾斜させる傾斜調整手段と、前記両補助安定化部材を共に、同一押し込み量にて前記記録ディスク面を押し込むように位置設定する位置制御手段とを備えたことを特徴とし、この構成によって、各補助安定化部材に対する傾斜調整手段と位置制御手段とによるチルト角と押し込み量の調整／設定により、各補助安定化部材と記録ディスクとの摺動を回避しつつ、各補助安定化部材の記録ディスクに対する空気力学的な力を確実に作用させることができるようになり、主安定化部材が位置する記録ディスク面において、主安定化部材に対向する作用力を効率よく発生させることが可能となる。これにより、主安定化部材および記録／再生手段におけるディスク半径方向の動線をディスク基準面に近い範囲に限定することができ、動作機構の簡略化を図ることができる。
【００２８】
請求項２に記載の発明は、可撓性を有する記録ディスクを回転させ、ベルヌーイ効果を利用して少なくとも記録／再生位置付近における前記記録ディスクの面ぶれを抑制する主安定化部材と、前記記録ディスクの主たるベルヌーイ効果の作用面とは逆の面において記録および／または再生を行う記録／再生手段とを備え、前記記録ディスクの面内を、前記記録／再生手段が走査する動線に近接し、かつ該記録ディスクの中心付近を通る直線Ａによって２つの領域に分け、該２つの領域のそれぞれに、空気力学的な作用力を発生させて、前記主安定化部材が位置する前記記録ディスク面において前記主安定化部材に対向する作用力を発生させるように補助安定化部材を配設した記録／再生装置であって、前記各補助安定化部材における空気力学的な力の作用面を共に、ディスク円周方向に同一チルト角にて傾斜させる傾斜調整手段と、前記各補助安定化部材を共に、同一押し込み量にて前記記録ディスク面を押し込むように位置設定する位置制御手段とを備えたことを特徴とし、この構成によって、各補助安定化部材に対する傾斜調整手段と位置制御手段とによるチルト角と押し込み量の調整／設定により、各補助安定化部材と記録ディスクとの摺動を回避しつつ、各補助安定化部材の記録ディスクに対する空気力学的な力を確実に作用させることができるようになり、主安定化部材が位置する記録ディスク面において、主安定化部材に対向する作用力を効率よく発生させることが可能となる。これにより、主安定化部材および記録／再生手段におけるディスク半径方向の動線をディスク基準面に近い範囲に限定することができ、動作機構の簡略化を図ることができる。
【００２９】
請求項３に記載の発明は、請求項１または２記載の記録／再生装置において、補助安定化部材を傾ける際の回転中心を、該補助安定化部材の作用面上における作用点近傍に設定したことを特徴とし、この構成によって、補助安定化部材のチルト角を調整した場合においても、最終的な目標となる作用点位置を固定することが可能となる。すなわち、補助安定化部材のチルト角により、前記作用点がディスク回転中心位置となるように設定すれば、前記回転中心と前記作用点を常に一致させることが可能となる。これにより、前記回転中心を基準に補助安定化部材の位置調整を行った場合においても、この操作によって前記作用点位置を前記回転中心位置により管理することができる。
【００３０】
請求項４に記載の発明は、請求項１または２記載の記録／再生装置において、記録ディスクのディスク仕様ごとに、補助安定化部材に設定された適正傾斜角の情報をあらかじめ記憶する記憶手段を備え、傾斜調整手段によりディスク仕様に応じて傾斜調整可能にしたことを特徴とし、この構成によって、様々なディスク仕様に対して、補助安定化部材の作用の適正化を図ることが可能となる。
【００３１】
請求項５に記載の発明は、請求項１または２記載の記録／再生装置において、当該装置で使用可能なディスク仕様範囲を限定して、該ディスク仕様範囲において設定された補助安定化部材の適正傾斜角の中心値に基づいて、補助安定化部材の傾きを固定したことを特徴とし、この構成によって、固定した補助安定化部材の配置条件を任意仕様範囲のディスクに適用できることにより、補助安定化部材の機構の簡略化が図れる。また、補助安定化部材をディスクカートリッジに固定することも可能となる。
【００３２】
請求項６に記載の発明は、可撓性を有する記録ディスクを回転させ、ベルヌーイ効果を利用して少なくとも記録／再生位置付近における前記記録ディスクの面ぶれを抑制する主安定化部材と、前記記録ディスクの主たるベルヌーイ効果の作用面とは逆の面において記録および／または再生を行う記録／再生手段とを備え、前記記録ディスクの面内を、前記記録／再生手段が走査する動線に近接し、かつ該記録ディスクの中心付近を通る直線Ａによって２つの領域に分け、該２つの領域のそれぞれに、空気力学的な作用力を発生させて、前記主安定化部材が位置する前記記録ディスク面において前記主安定化部材に対向する作用力を発生させるように補助安定化部材を配設した記録／再生装置に用いられる安定化調整方法であって、前記各補助安定化部材の空気力学的な力の作用面を共に、ディスク半径方向に同一チルト角にて傾け、かつ前記各補助安定化部材を共に、同一押し込み量にて前記記録ディスク面を押し込むことにより、前記主安定化部材に対向する前記作用力を適正化することを特徴とし、この構成によって、各補助安定化部材に対するチルト角と押し込み量の調整／設定することにより、各補助安定化部材と記録ディスクとの摺動を回避しつつ、各補助安定化部材の記録ディスクに対する空気力学的な力を確実に作用させることができるようになり、主安定化部材が位置する記録ディスク面において、主安定化部材に対向する作用力を効率よく発生させることが可能となる。これにより、主安定化部材および記録／再生手段におけるディスク半径方向の動線をディスク基準面に近い範囲に限定することができ、動作機構の簡略化を図ることができる。
【００３３】
請求項７に記載の発明は、可撓性を有する記録ディスクを回転させ、ベルヌーイ効果を利用して少なくとも記録／再生位置付近における前記記録ディスクの面ぶれを抑制する主安定化部材と、前記記録ディスクの主たるベルヌーイ効果の作用面とは逆の面において記録および／または再生を行う記録／再生手段とを備え、前記記録ディスクの面内を、前記記録／再生手段が走査する動線に近接し、かつ該記録ディスクの中心付近を通る直線Ａによって２つの領域に分け、該２つの領域のそれぞれに、空気力学的な作用力を発生させて、前記主安定化部材が位置する前記記録ディスク面において前記主安定化部材に対向する作用力を発生させるように補助安定化部材を配設した記録／再生装置に用いられる安定化調整方法であって、前記各補助安定化部材の空気力学的な力の作用面を共に、ディスク円周方向に同一チルト角にて傾け、かつ前記各補助安定化部材を共に、同一押し込み量にて前記記録ディスク面を押し込むことにより、前記主安定化部材に対向する前記作用力を適正化することを特徴とし、この構成によって、各補助安定化部材に対するチルト角と押し込み量の調整／設定することにより、各補助安定化部材と記録ディスクとの摺動を回避しつつ、各補助安定化部材の記録ディスクに対する空気力学的な力を確実に作用させることができるようになり、主安定化部材が位置する記録ディスク面において、主安定化部材に対向する作用力を効率よく発生させることが可能となる。これにより、主安定化部材および記録／再生手段におけるディスク半径方向の動線をディスク基準面に近い範囲に限定することができ、動作機構の簡略化を図ることができる。
【００３４】
請求項８に記載の発明は、請求項６または７記載の記録／再生装置の安定化調整方法において、記録ディスクの任意ディスク仕様ごとに、補助安定化部材の適正傾斜角の情報をあらかじめ記憶しておき、ディスク仕様に応じて補助安定化部材の傾きを調整することを特徴とし、この構成によって、様々なディスク仕様に対して、補助安定化部材の作用の適正化を図ることが可能となる。
【００３５】
請求項９に記載の発明は、請求項６または７記載の記録／再生装置の安定化調整方法において、当該装置において使用するディスク仕様範囲を限定して、補助安定化部材の傾きを、ディスク仕様範囲によって決定される補助安定化部材の適正傾斜角の中心値に固定して設定することを特徴とし、この構成によって、固定した補助安定化部材の配置条件を任意仕様範囲のディスクに適用できることにより、補助安定化部材の機構の簡略化が図れる。また、補助安定化部材をディスクカートリッジに固定することも可能となる。
【００３６】
請求項１０に記載の発明は、請求項６または７記載の記録／再生装置の安定化調整方法において、補助安定化部材を傾斜調整することにより、補助安定化部材の空気力学的な力の作用点を該補助安定化部材の略回転中心に設定することを特徴とし、この構成によって、様々なディスク仕様に対して、補助安定化部材の作用の適正化を図ることが可能となる。
【００３８】
【発明の実施の形態】
以下、本発明の実施の形態を図面を参照して説明する。
【００３９】
図１は本発明の記録／再生装置の参考例を説明するための要部の平面図、図２（ａ）は図１におけるＥ−Ｅ’線断面図、図２（ｂ）は図１におけるＦ−Ｆ’線断面図、図３は図１における記録／再生装置の正面図であり、１は可撓性を有する記録ディスクである光ディスク、２は光ディスク１の回転中心（中央）部分に装着された光ディスク１を回転させるために保持する一方の保持部材であるハブ、３は他方の保持部材であるチャッキング部をハブ２に嵌合して光ディスク１を回転駆動するスピンドルモータ、４は、光ディスク１の半径方向に移動して光ディスク１に対して光ビームを集光させ、情報の記録／再生処理を行うため光ディスク１に対して光走査（動線Ｒ方向）を行う記録／再生手段である光ピックアップである。
【００４０】
さらに、５は、正面から見て光ディスク１側が円弧状に突出し、図１に示すように、光ピックアップ４の移動に同期してディスク半径方向の光ピックアップ走査動線Ｒ方向に移動する主安定化部材であって、主安定化部材５は、ベルヌーイの法則による空気力学的作用力を利用して、光ディスク１における少なくとも光ピックアップ４による記録／再生位置付近の面ぶれを抑制するものである。
【００４１】
さらに、６は、主安定化部材５と共に作用して、光ディスク１に対して空気力学的作用力を作用させる補助安定化部材であって、主安定化部材５と補助安定化部材６とは光ディスク１の記録面とは反対側のディスク基板側に配設されている。
【００４２】
また、参考例では、光ディスク１の面内を光ピックアップ４が走査するために移動する動線Ｒと近接し、かつ光ディスク１の中心付近を通る直線（図では動線Ｒ上に記載したが、動線Ｒ近傍にあるものも含む）Ａによって分けた２つの領域Ｓ１，Ｓ２のうち、光ピックアップ４における光ディスク回転方向の下流側に位置する領域Ｓ２に、主安定化部材５とは独立して補助安定化部材６を少なくとも１つ（参考例では１つのみを示す）配設している。
【００４３】
また、主安定化部材５には、ディスク半径方向の移動制御機構１１とディスク回転軸方向の位置制御機構１２を具備させ、また各補助安定化部材６には、ディスク回転軸方向の位置制御機構１３と、ディスク半径方向とディスク円周方向の傾斜調整手段であるチルト制御機構１４を具備させており、移動制御機構１１，位置制御機構１２および１３，チルト制御機構１４は、それぞれ各種設定データなどを記憶するメモリ１５から制御データを受ける駆動部１６により駆動制御される。
【００４４】
また、補助安定化部材６のチルト角制御機構１４のチルト角制御における回転中心は、補助安定化部材６の作用面中心（作用点）２３の位置としている。なお、図１〜図３中において、２１は補助安定化部材６と光ディスク１の近接点、２２は補助安定化部材６と光ディスク１の近接領域を示している。
【００４５】
図４は本発明の記録／再生装置の実施形態１を説明するための要部の平面図、図５（ａ）は図４におけるＥ−Ｅ’線断面図、図５（ｂ）は図４におけるＦ−Ｆ’線断面図である。なお、以下の説明において、既に説明した部材に対応する部材には同一符号を付して詳しい説明は省略する。
【００４６】
実施形態１が参考例と異なる点は、参考例にて説明したのと同様にして分けた２つの領域Ｓ１，Ｓ２のそれぞれに、主安定化部材５と独立して補助安定化部材６を少なくとも１つずつ（実施形態１では各領域に１つ）を、対称位置に配設した構成である。
【００４７】
図６は本発明の記録／再生装置の実施形態２を説明するための要部の平面図、図７（ａ）は図６におけるＥ−Ｅ’線断面図、図７（ｂ）は図６におけるＦ−Ｆ’線断面図であって、実施形態２が実施形態１と異なる点は、図５（ａ），（ｂ）と比較して分かるように、図７（ａ），（ｂ）に示すような補助安定化部材６のディスク円周方向傾きの調整方向である。
【００４８】
参考例と実施形態の動作について説明する。
【００４９】
前記参考例と実施形態における基本構成である安定化部材と可撓性を有するディスクとの間でベルヌーイの法則による空気力学的な力を発生させて、ディスク面ぶれを抑制するためには、安定化部材とディスク間の釣り合い条件が重要であり、特にディスクの安定化部材に向かう反力が重要なパラメータとなる。この反力はディスクの剛性と、ディスクが回転して平坦化しようとすることによって発生する浮上力によって決定されるため、原理的に、前記釣り合い条件は安定化部材の半径位置，ディスク回転数、およびディスク仕様がパラメータによって左右され、複雑な調整駆動機構が必要になる。
【００５０】
この点に関して各種実験を行い考察を行ったところ、任意の安定化部材によりディスク面に空気力学的な力を作用させた際には、該安定化部材におけるディスク回転方向の上下流のほぼ±９０度付近のディスク面が、ディスクを理想平面と考えた場合のディスク基準面付近に近づく現象を示した。
【００５１】
そこで、任意の安定化部材から±９０度ずれた位置のディスク面がディスク基準面付近に近づく現象を、上述した反力として利用して、安定化部材とディスク間の釣り合い条件を調整することを目標とした結果、その通りディスク面を効率的に安定化させる効果が得られた。
【００５２】
しかしながら、調整に用いた安定化部材（補助安定化部材）位置においては、図１４〜図１６に示すように、その空気力学的な力の作用点が、補助安定化部材の中心点からずれる現象が観察され、このずれが原因となって、前述した補助安定化部材の効果を阻害する場合があることが明らかとなった。この点に関して、さらなる各種実験を行い考察を行ったところ、補助安定化部材のチルト角を調整することにより、補助安定化部材６の中心点と、補助安定化部材の空気力学的な力の作用点を一致させることができることを見出した。
【００５３】
本実施形態では、補助安定化部材６のチルト角によって、補助安定化部材６の空気力学的な力の作用点を適正位置に調整し、補助安定化部材６の光ディスク１に対する空気力学的な力を確実に作用させるようにしている。
【００５４】
参考例では、補助安定化部材６の空気力学的な力を光ディスク１に対して適正に作用させることにより、光ディスク１が主安定化部材５に対向する力を効率的に発生させることができ、主安定化部材５の移動位置において十分な面ぶれ低減効果が得られた。これにより、主安定化部材５および光ピックアップ４のディスク半径方向の動線Ｒを、面ぶれが抑制されたディスク基準面に近い範囲（斜線にて図示した比較的広い領域）Ｈ内に位置させることができ、このための調整機構に余裕を持たせることができることになり、調整機構の簡略化を図ることができた。
【００５５】
なお、参考例の構成は、主安定化部材５のみで装置を構成した場合に、主安定化部材５における下流側のディスク面が主安定化部材５に近接する側に変位するような光ディスク１における一例であり、例えば、光ディスク１の静的な反り形状が光ピックアップ４側に凸状となるような光ディスク１がこれに相当した。この際の補助安定化部材のチルト角の調整は、ディスク半径方向に対し、外周側を光ピックアップに近づける方向、ディスク円周方向に対し、ディスク中心に向かって右回りの方向（補助安定化部材のディスク回転上流側をディスクに近づける方向）が妥当であった。
【００５６】
また、例えば、主安定化部材５のみで装置を構成した場合に、主安定化部材５における上流側のディスク面が主安定化部材５に近接する側に変位するような光ディスク１（光ディスク１の静的な反り形状が光ピックアップ４側に凹状となるような光ディスク１がこれに相当）においては、参考例を変形してディスク回転方向を逆転させた構成が適用でき、同形態においても、補助安定化部材６の空気力学的な力を光ディスク１に対して適正に作用させることにより、光ディスク１が主安定化部材５に対向する力を効率的に発生させることができ、主安定化部材５の移動位置において十分な面ぶれ低減効果が得られた。この際の補助安定化部材６のチルト角の調整は、ディスク半径方向に対しては外周側を光ピックアップ４に近づける方向、ディスク円周方向に対してはディスク中心に向かって右回りの方向（補助安定化部材のディスク回転下流側をディスクに近づける方向）が妥当であった。
【００５７】
実施形態１の構成においても、両補助安定化部材６の空気力学的な力を光ディスク１に対して適正に作用させることにより、光ディスク１が主安定化部材５に対向する力を効率的に発生させることができ、主安定化部材５の移動位置において十分な面ぶれ低減効果が得られた。
【００５８】
これにより、主安定化部材５および光ピックアップ４におけるディスク半径方向の動線Ｒを、面ぶれが抑制されたディスク基準面に近い範囲（斜線にて図示した比較的広い領域）Ｈ内に位置させることができ、このための調整機構に余裕を持たせることができることになり、調整機構の簡略化を図ることができた。
【００５９】
なお、実施形態１の構成は、主安定化部材５のみで装置を構成した場合に、主安定化部材５における下流側のディスク面が主安定化部材５に近接する側に変位するような光ディスク１における一例であり、例えば、光ディスク１の静的な反り形状が光ピックアップ４側に凸状となるような光ディスク１がこれに相当した。この際の両補助安定化部材６のチルト角の調整は、ディスク半径方向に対しては外周側を光ピックアップ４に近づける方向、ディスク円周方向に対してはディスク中心に向かって右回りの方向（補助安定化部材６のディスク回転上流側を光ディスク１に近づける方向）が妥当であった。
【００６０】
実施形態２の構成においても、両補助安定化部材６の空気力学的な力を光ディスク１に対して適正に作用させることにより、光ディスク１が主安定化部材５に対向する力を効率的に発生させることができ、主安定化部材５の移動位置において十分な面ぶれ低減効果が得られた。
【００６１】
これにより、主安定化部材５および光ピックアップ４におけるディスク半径方向の動線Ｒを、面ぶれが抑制されたディスク基準面に近い範囲（斜線にて図示した比較的広い領域）Ｈ内に位置させることができ、このための調整機構に余裕を持たせることができることになり、調整機構の簡略化を図ることができた。
【００６２】
なお、実施形態２の構成は、主安定化部材５のみで装置を構成した場合に、主安定化部材５における上流側のディスク面が主安定化部材５に近接する側に変位するような光ディスク１における一例であり、例えば、光ディスク１の静的な反り形状が光ピックアップ４側に凹状となるような光ディスク１がこれに相当した。この際の両補助安定化部材６のチルト角の調整は、ディスク半径方向に対しては外周側を光ピックアップに近づける方向、ディスク円周方向に対してはディスク中心に向かって左回りの方向（補助安定化部材６のディスク回転下流側をディスクに近づける方向）が妥当であった。
【００６３】
実施形態１，２の構成において、主安定化部材５にディスク回転軸方向の位置制御機構、あるいはチルト制御系などを付加して、より高精度の微調整を行うことにより、記録／再生位置における面ぶれを最適化することも可能であった。
【００６４】
図８は本発明の記録／再生装置の実施形態２の変形例を説明するための要部の平面図、図９（ａ）は図８におけるＥ−Ｅ’線断面図、図９（ｂ）は図８におけるＦ−Ｆ’線断面図であって、実施形態２においては、図８，図９に示す変形例のように、光ディスク１のハブ２を、図３に示すスピンドルモータ３のチャッキング部に固定して、各安定化部材５，６側を押して撓ませた場合に光ディスク１において撓みが始まる支点位置（図８ではハブ２の外周）を結んだ周部（図８では円形領域）と直線Ａとが交差する２点を通り、かつ該直線Ａに垂直な２つの直線、すなわち主安定化部材５に近い側の直線Ｂ１と遠い側の直線Ｂ２とにより挟まれたディスク面上の領域Ｃにおいて、主安定化部材５に近い側の直線Ｂ１近傍に、補助安定化部材６の作用点２３を配置する構成とすることにより、主安定化部材５の移動位置でのディスク面ぶれをより低減させ、前述の効果を十分奏し得た。
【００６５】
なお、前記実施形態における補助安定化部材６の傾斜調整としては、装置において使用される光ディスクのディスク仕様ごとに、あらかじめテストなどを行ってディスク仕様に対応させて設定した補助安定化部材６の最適傾斜角情報を、図３に示すメモリ１５に記憶させておき、光ディスクが装置に装填されると、自動的にメモリ１５から該光ディスクのディスク仕様に対応する適正傾斜角情報を読み出し、チルト制御機構１４を駆動して傾斜調整を行うようにすることが考えられる。
【００６６】
さらに、当該装置で使用可能なディスク仕様範囲を限定して、該ディスク仕様範囲において設定された補助安定化部材６の適正傾斜角の中心値に基づき傾きを固定し、補助安定化部材６を適所に設置するようにしてもよい。このようにすることにより、固定した補助安定化部材６の配置条件を任意仕様範囲のディスクに適用でき、補助安定化部材６の機構の簡略化を図ることができる。
【００６７】
前記各実施形態は、前記補助安定化部材６を、図１０に例示するように、装置本体の筐体３０に設けることにより、光ディスクを収納するディスクカートリッジを用いないか、あるいはディスクカートリッジから光ディスクを取り出して駆動する記録／再生装置において実施することができる。
【００６８】
また、前記各実施形態における補助安定化部材６は、図１１に示すように、ディスクカートリッジ３１の内壁に設けることも可能であり、このように構成することにより、記録／再生装置側の構成を簡略化することができる。さらに、この構成においては、ディスクカートリッジ３１に補助安定化部材６を個別に設定することができることから、様々なディスク仕様ごとに補助安定部材６を個々に設計可能となり、ディスク仕様のばらつきによる安定化条件のずれを補正することまでもが可能となる。
【００６９】
ディスクカートリッジ３１としては、例えば図１２，図１３に示す構成のものを例示することができる。図１２，図１３において、３２は、主安定化部材５が挿入され、ディスク半径方向に移動可能にするための第１の通孔部、３３は、光ピックアップ４およびスピンドルモータ３の一部が挿入され、かつ光ピックアップ４をディスク半径方向に移動可能にするための第２の通孔部である。なお、前記通孔部３２，３３を開閉するためのシャッタ、あるいはカートリッジ内で光ディスク１を固定するための機構、さらにカートリッジをスピンドルモータ３に設置する際に必要なその他の機構などに関しては図示していない。
【００７０】
前記実施形態においては、補助安定化部材を主安定化部材と同じ側に配置する構成例を説明したが、補助安定化部材を主安定化部材とディスクを挟んで逆側に配置しても同様のディスク面ぶれ低減効果が得られる。
【００７１】
次に、本発明をより具体的に参考実施例，実施例，比較例に基づいて説明する。
【００７２】
（参考実施例１）
参考実施例１において、図１，図２に示す構成を採用しており、補助安定化部材６は、光ディスク（直径１２０ｍｍ）１に対向する面を曲率半径１００ｍｍとした直径１５ｍｍの円柱状の形状とし、主安定化部材５は、光ディスク１に対向する面を曲率半径１００ｍｍとした直径１０ｍｍの円柱状の形状とした。また補助安定化部材６は、主安定化部材５よりもディスク回転方向下流側の９０度位置で、ディスク対向面の中心が光ディスク１の半径４５ｍｍの位置となるように配置した。図示していないが、主安定化部材５には、ディスク半径方向の移動機構とディスク回転軸方向の位置制御機構を具備させ、また補助安定化部材６には、ディスク回転軸方向の位置制御機構と、ディスク半径方向とディスク円周方向のチルト制御機構を具備させた。なお、補助安定化部材６のチルト制御機構のチルト角制御における回転中心は、前記補助安定化部材の作用面の中心位置とした。
【００７３】
また参考実施例１では、ディスク基板として１２０ｍｍ，厚さ７５μｍのポリカーボネイト製シートを用いた場合について説明する。ディスクを準備するにあたっては、まず、前記シートに、熱転写でスタンパのピッチ０．６μｍ，幅０．３μｍのグルーブを転写し、その後、スパッタリングによりシート／Ａｇ反射層１２０ｎｍ／（ＺｒＯ_２−Ｙ_２Ｏ_３）−ＳｉＯ_２７ｎｍ／ＡｇＩｎＳｂＴｅＧｅ１０ｎｍ／ＺｎＳ−ＳｉＯ_２２５ｎｍ／Ｓｉ_３Ｎ_４１０ｎｍの順番に成膜した。情報記録領域は内周直径４０ｍｍから外周直径１１８ｍｍまで（半径２０ｍｍ〜５８ｍｍ）の範囲に設定した。その後、ＵＶ樹脂をスピンコートし、紫外線照射で硬化させて厚さ５μｍの透明保護膜を形成した。また、逆側の面には１０μｍ厚のハードコートを施した。なお、ディスク中心部には外形直径３０ｍｍ，内径直径１５ｍｍ、厚み０．３ｍｍのハブ２を取り付けた。このディスクの仕上がり状態はハードコート側に僅かに反った形状となった。
【００７４】
前記光ディスク１を１５ｍ／ｓｅｃのディスク回転数で回転させ、補助安定化部材と主安定化部材を所定位置に配置してディスク面振れを安定化し、光ピックアップ４の位置にレーザ変位計を配置してディスク面ぶれを評価した。また、前記補助安定化部材と前記記録ディスクの間の接触を前記補助安定化部材に配置した図示していないＡＥセンサによって検知し、その接触摺動状態を評価した。ここにおいて、補助安定化部材は、ディスク半径方向に対し、外周部を光ピックアップに近づける方向に１度、ディスク円周方向に対し、ディスク中心に向かって右回りの方向に０．７度傾け、また、ディスク基準面を基準として０．５ｍｍ押し込む位置に配置した。なお、ここでのディスク基準面とは、ディスクが理想的に平坦であると仮定した場合の主安定化部材５側のディスク面のことであり、また、この押し込み量を決める補助安定化部材６の基準位置はチルト角制御の中心位置とした。
【００７５】
（参考実施例２）
参考実施例２では、参考実施例１の構成を基本として、補助安定化部材６の位置を、主安定化部材５よりもディスク回転方向上流側の９０度位置で、ディスク対向面の中心がディスクの半径４５ｍｍ位置となるような配置に変更した。
【００７６】
また、光ディスク１は、参考実施例１の仕様からハードコートを省いた構成とした。これにより、光ディスク１の仕上がり状態は、透明保護膜側に僅かに反った形状となった。
【００７７】
前記光ディスク１を１５ｍ／ｓｅｃのディスク回転数で回転させ、補助安定化部材と主安定化部材を所定位置に配置してディスク面振れを安定化し、光ピックアップ４の位置にレーザ変位計を配置してディスク面ぶれを評価した。また、前記補助安定化部材と前記記録ディスクの間の接触を前記補助安定化部材に配置した図示していないＡＥセンサによって検知し、その接触摺動状態を評価した。ここにおいて、補助安定化部材は、ディスク半径方向に対し、外周部を光ピックアップに近づける方向に２度、ディスク円周方向に対し、ディスク中心に向かって左回りの方向に１度傾け、また、ディスク基準面を基準として１ｍｍ押し込む位置に配置した。なお、ここでのディスク基準面とは、ディスクが理想的に平坦であると仮定した場合の主安定化部材５側のディスク面のことであり、また、この押し込み量を決める補助安定化部材６の基準位置はチルト角制御の中心位置とした。
【００７８】
（実施例１）
実施例１では、図４，図５に示す構成を採用しており、両補助安定化部材６は、光ディスク（直径１２０ｍｍ）１に対向する面を曲率半径１００ｍｍとした直径１５ｍｍの円柱状の形状とし、主安定化部材５は、光ディスク１に対向する面を曲率半径１００ｍｍとした直径１０ｍｍの円柱状の形状とした。また両補助安定化部材６は、主安定化部材５におけるディスク回転方向上下流の９０度の両位置で、ディスク対向面の中心が光ディスク１の半径４５ｍｍの位置となるように配置した。図示していないが、主安定化部材５には、ディスク半径方向の移動機構とディスク回転軸方向の位置制御機構を具備させ、また両補助安定化部材６には、ディスク回転軸方向の位置制御機構と、ディスク半径方向とディスク円周方向のチルト制御機構を具備させた。なお、補助安定化部材６のチルト角制御機構のチルト角制御における回転中心は、前記補助安定化部材の作用面の中心位置とした。
【００７９】
光ディスク１は参考実施例１と同様のものを用いた。
【００８０】
前記光ディスク１を１５ｍ／ｓｅｃのディスク回転数で回転させ、両補助安定化部材と主安定化部材を所定位置に配置してディスク面ぶれを安定化し、光ピックアップ４の位置にレーザ変位計を配置してディスク面ぶれを評価した。また、前記補助安定化部材と前記記録ディスクの間の接触を前記補助安定化部材に配置した図示していないＡＥセンサによって検知し、その接触摺動状態を評価した。ここにおいて、両補助安定化部材は、ディスク半径方向に対し、外周部を光ピックアップに近づける方向に０．７度、ディスク円周方向に対し、ディスク中心に向かって右回りの方向に０．４度傾け、また、ディスク基準面を基準として０．３ｍｍ押し込む位置に配置した。なお、ここでのディスク基準面とは、ディスクが理想的に平坦であると仮定した場合の主安定化部材５側のディスク面のことであり、また、この押し込み量を決める両補助安定化部材６の基準位置はチルト角制御の中心位置とした。
【００８１】
（実施例２）
実施例２では、図６，図７に示す構成を採用しており、両補助安定化部材６は、光ディスク（直径１２０ｍｍ）１に対向する面を曲率半径１００ｍｍとした直径１５ｍｍの円柱状の形状とし、主安定化部材５は、光ディスク１に対向する面を曲率半径１００ｍｍとした直径１０ｍｍの円柱状の形状とした。また両補助安定化部材６は、主安定化部材５におけるディスク回転方向上下流の９０度の両位置で、ディスク対向面の中心が光ディスク１の半径４５ｍｍの位置となるように配置した。図示していないが、主安定化部材５には、ディスク半径方向の移動機構とディスク回転軸方向の位置制御機構を具備させ、また両補助安定化部材６には、ディスク回転軸方向の位置制御機構と、ディスク半径方向とディスク円周方向のチルト制御機構を具備させた。なお、補助安定化部材６のチルト制御機構のチルト角制御における回転中心は、前記補助安定化部材の作用面の中心位置とした。
【００８２】
また、光ディスク１は、参考実施例１の仕様からハードコートを省いた構成とした。これにより、光ディスク１の仕上がり状態は、透明保護膜側に僅かに反った形状となった。
【００８３】
前記光ディスク１を１５ｍ／ｓｅｃのディスク回転数で回転させ、両補助安定化部材と主安定化部材を所定位置に配置してディスク面ぶれを安定化し、光ピックアップ４の位置にレーザ変位計を配置してディスク面ぶれを評価した。また、前記補助安定化部材と前記記録ディスクの間の接触を前記補助安定化部材に配置した図示していないＡＥセンサによって検知し、その接触摺動状態を評価した。ここにおいて、両補助安定化部材は、ディスク半径方向に対し、外周部を光ピックアップに近づける方向に１度、ディスク円周方向に対し、ディスク中心に向かって左回りの方向に０．７度傾け、また、ディスク基準面を基準として０．５ｍｍ押し込む位置に配置した。なお、ここでのディスク基準面とは、ディスクが理想的に平坦であると仮定した場合の主安定化部材５側のディスク面のことであり、また、この押し込み量を決める両補助安定化部材６の基準位置はチルト角制御の中心位置とした。
【００８４】
（実施例３）
実施例３では、図８，図９に示す構成を採用しており、両補助安定化部材６は、光ディスク（直径１２０ｍｍ）１に対向する面を曲率半径１００ｍｍとした直径１５ｍｍの円柱状の形状とし、主安定化部材５は、光ディスク１に対向する面を曲率半径１００ｍｍとした直径１０ｍｍの円柱状の形状とした。また両補助安定化部材６は、主安定化部材５におけるディスク回転方向上下流の７５度の両位置で、ディスク対向面の中心が光ディスク１の半径４５ｍｍの位置となるように配置した。図示していないが、主安定化部材５には、ディスク半径方向の移動機構とディスク回転軸方向の位置制御機構を具備させ、また両補助安定化部材６には、ディスク回転軸方向の位置制御機構と、ディスク半径方向とディスク円周方向のチルト制御機構を具備させた。なお、補助安定化部材６のチルト制御機構のチルト角制御における回転中心は、前記補助安定化部材の作用面の中心位置とした。
【００８５】
光ディスク１は参考実施例１と同様のものを用いた。
【００８６】
前記光ディスク１を１５ｍ／ｓｅｃのディスク回転数で回転させ、両補助安定化部材と主安定化部材を所定位置に配置してディスク面ぶれを安定化し、光ピックアップ４の位置にレーザ変位計を配置してディスク面ぶれを評価した。また、前記補助安定化部材と前記記録ディスクの間の接触を前記補助安定化部材に配置した図示していないＡＥセンサによって検知し、その接触摺動状態を評価した。ここにおいて、両補助安定化部材は、ディスク半径方向に対し、外周部を光ピックアップに近づける方向に０．７度、ディスク円周方向に対し、ディスク中心に向かって右回りの方向に０．４度傾け、また、ディスク基準面を基準として０．３ｍｍ押し込む位置に配置した。なお、ここでのディスク基準面とは、ディスクが理想的に平坦であると仮定した場合の主安定化部材５側のディスク面のことであり、また、この押し込み量を決める両補助安定化部材６の基準位置はチルト角制御の中心位置とした。
【００８７】
（比較例）
本比較例においては、図１４〜図１６に示す構成を採用しており、両補助安定化部材６は、光ディスク（直径１２０ｍｍ）１に対向する面を曲率半径１００ｍｍとした直径１５ｍｍの円柱状の形状とし、主安定化部材５は、光ディスク１に対向する面を曲率半径１００ｍｍとした直径１０ｍｍの円柱状の形状とした。また両補助安定化部材６は、主安定化部材５におけるディスク回転方向上下流の９０度の両位置で、ディスク対向面の中心が光ディスク１の半径４５ｍｍの位置となるように配置した。図示していないが、主安定化部材５には、ディスク半径方向の移動機構とディスク回転軸方向の位置制御機構を具備させ、また両補助安定化部材６には、ディスク回転軸方向の位置制御機構を具備させた。
【００８８】
光ディスク１は参考実施例１と同様のものを用いた。
【００８９】
前記光ディスク１を１５ｍ／ｓｅｃのディスク回転数で回転させ、両補助安定化部材と主安定化部材を所定位置に配置してディスク面ぶれを安定化し、光ピックアップ４の位置にレーザ変位計を配置してディスク面ぶれを評価した。また、前記補助安定化部材と前記記録ディスクの間の接触を前記補助安定化部材に配置した図示していないＡＥセンサによって検知し、その接触摺動状態を評価した。両補助安定化部材は、ディスク基準面を基準として０．５ｍｍ押し込む位置に配置した。なお、ここでのディスク基準面とは、ディスクが理想的に平坦であると仮定した場合の主安定化部材５側のディスク面のことであり、また、この押し込み量を決める両補助安定化部材６の基準位置は補助安定化部材の作用面中心とした。
【００９０】
参考実施例と実施例と比較例とにおいて、半径５５ｍｍ位置のディスク面ぶれ、および同面ぶれ安定化を行った際のディスクと補助安定化部材の摺動状態をテストした結果は、図１７に示すようになった。
【００９１】
各実施例においては、補助安定化部材のチルト角の調整により、図１〜４に図示するように、補助安定部材６と光ディスク１の近接点２１、すなわち空気力学的な力の作用点と、補助安定化部材６の作用面中心２３、すなわち補助安定化部材６の空気力学的な力を作用させる適正点を、略同一の位置に調整することができ、これによって、補助安定化部材６の光ディスク１に対する空気力学的な力を確実に作用させることができるようになった。
【００９２】
前記作用による第１の効果として、主安定化部材５の移動位置における良好な面ぶれ低減効果が得られた。これは補助安定化部材６による作用により、主安定化部材５が位置する光ディスク面において主安定化部材５に対向する作用力を効率よく発生できたことと関係している。
【００９３】
なお、特に前記実施例１〜３においては、この効果に補助安定化部材６の配置形態の効果が加わり、より小さなディスク面ぶれを実現できた。
【００９４】
また、前記作用による第２の効果として、光ディスク１と補助安定化部材６間の浮上状態が実現でき、光ディスク／補助安定化部材間の接触摺動を確実に回避することができた。これは、補助安定化部材６による空気力学的な力の作用点をチルト角調整によって適正点に調整できたことによっている。
【００９５】
これに対して、比較例においては、図１４〜図１６において図示するように、補助安定部材６と光ディスク１の近接点２１、すなわち空気力学的な力の作用点が、補助安定化部材６の作用面中心２３、すなわち補助安定化部材の空気力学的な力を作用させる適正点からずれて、前記補助安定化部材６の作用面境界域に近い側に位置してしまい、補助安定化部材６による空気力学的な力の発生が不安定となってしまった。
【００９６】
このため、主安定化部材５の位置におけるディスク面ぶれに不正振動が重畳し、十分なディスク面ぶれ低減効果を得ることができなかった。そればかりか、補助安定化部材６による空気力学的な力の発生が不安定となったことにより、補助安定化部材６と光ディスク１の間の浮上条件が確立できずに接触摺動を引き起こし、光ディスク１にダメージを与えることとなってしまった。
【００９７】
上述したように本実施形態，本実施例では、ベルヌーイ効果を作用させる主安定化部材と補助安定化部材との構成において、前記補助安定化部材による空気力学的な作用力を適正化して、記録／再生位置における良好なディスク面ぶれの低減を実現可能な記録／再生装置を提供することができる。
【００９８】
【発明の効果】
以上説明したように、本発明に係る記録／再生装置および安定化調整方法によれば、ベルヌーイ効果を作用させる主安定化部材と各補助安定化部材との構成において、各補助安定化部材における空気力学的な力の作用面を共に、同一チルト角にて傾斜調整させ、かつ各補助安定化部材を共に、同一押し込み量にて記録ディスク面に対する押し込み設定することにより、各補助安定化部材と記録ディスクとの摺動を回避しつつ、各補助安定化部材の記録ディスクに対する空気力学的な力を確実に作用させることができるようになり、主安定化部材が位置する記録ディスク面において主安定化部材に対向する作用力を効率よく発生させることが可能となり、ディスク面ぶれを良好に低減することができる。これにより、主安定化部材および記録／再生手段におけるディスク半径方向の動線をディスク基準面に近い範囲に限定することができ、動作機構の簡略化が可能になる。
【図面の簡単な説明】
【図１】本発明の記録／再生装置の参考例を説明するための要部の平面図
【図２】（ａ）は図１におけるＥ−Ｅ’線断面図、（ｂ）は図１におけるＦ−Ｆ線断面図
【図３】図１の参考例の正面図
【図４】本発明の記録／再生装置の実施形態１を説明するための要部の平面図
【図５】（ａ）は図４におけるＥ−Ｅ’線断面図、（ｂ）は図４におけるＦ−Ｆ線断面図
【図６】本発明の記録／再生装置の実施形態２を説明するための要部の平面図
【図７】（ａ）は図６におけるＥ−Ｅ’線断面図、（ｂ）は図６におけるＦ−Ｆ線断面図
【図８】本発明の記録／再生装置の実施形態２の変形例を説明するための要部の平面図
【図９】（ａ）は図８におけるＥ−Ｅ’線断面図、（ｂ）は図８におけるＦ−Ｆ線断面図
【図１０】本実施形態の記録／再生装置における補助安定化部材の設置例を示す断面図
【図１１】ディスクカートリッジを説明するための断面図
【図１２】図１１のディスクカートリッジの平面図
【図１３】図１１のディスクカートリッジの横断面図
【図１４】本発明の比較例としての記録／再生装置の要部の平面図
【図１５】図１４におけるＥ−Ｅ’線断面図
【図１６】図１４における記録／再生装置の正面図
【図１７】本発明の参考実施例と実施例と比較例とにおける特性評価の一覧を示す図
【符号の説明】
１光ディスク
２ハブ
３スピンドルモータ
４光ピックアップ
５主安定化部材
６補助安定化部材
１１移動制御機構
１２，１３位置制御機構
１４チルト制御機構
１５メモリ
１６駆動部
２１補助安定化部材と光ディスクの近接点
２２補助安定化部材と光ディスクの近接領域
２３補助安定化部材の作用面中心（作用点）
３０装置本体の筺体
３１ディスクカートリッジ
Ａ光ピックアップ動線の延長線
Ｂ１，Ｂ２ハブの周部を通り直線Ａに垂直な直線
Ｒ動線
Ｓ１，Ｓ２，Ｃ記録ディスクの面内において区分した領域[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a recording / reproducing apparatus for performing recording and / or reproducing processing on a flexible recording disk, and a stabilization adjustment method applied to the recording / reproducing apparatus. To the law It is related.
[0002]
[Prior art]
In recent years, there has been a demand for information recording media to record large volumes of digital data, such as the start of digitization of television broadcasting. For example, in the field of optical discs, one of the basic methods for increasing the density is to reduce the diameter of the light spot collected on the optical disc for recording / reproduction (hereinafter referred to as an optical disc). As a representative example, the recording disk used in the recording / reproducing apparatus targeted by the present invention is intended for all the disk-shaped recording disks such as phase change memory, magneto-optical memory, hologram memory, etc. Not limited to optical discs).
[0003]
For this reason, in increasing the density of the optical disk, it is effective to shorten the wavelength of light used for recording / reproduction and increase the numerical aperture NA of the objective lens. As for the wavelength of light, a wavelength of near infrared light of 780 nm is used for CD (compact disk), and a wavelength of about 650 nm of red light is used for DVD (digital versatile disk). Recently, a blue-violet semiconductor laser has been developed, and it is expected that a laser beam of around 400 nm will be used in the future.
[0004]
As for the objective lens, it was less than NA0.5 for CD, but it is about NA0.6 for DVD. In the future, it is required to further increase the numerical aperture (NA) to NA or more 0.7. However, increasing the NA of the objective lens and shortening the wavelength of light also increase the influence of aberrations when focusing light. Therefore, the margin for the tilt of the optical disk is reduced. Further, since the depth of focus is reduced by increasing the NA, the focus servo accuracy must be increased.
[0005]
Furthermore, since the distance between the objective lens and the recording surface of the optical disk is reduced by using a high NA objective lens, it is necessary to reduce the surface blur of the optical disk before the focus servo at the start is pulled in. The objective lens and the optical disk may collide, causing a pickup failure.
[0006]
As a short-wavelength, high-NA high-capacity optical disk, for example, as described in Non-Patent Document 1, a recording film is formed on a substrate that is as thick as a CD and has high rigidity, and is used for recording / reproducing light. Has been proposed in which recording / reproduction is performed on a recording film through a thin cover layer without passing through the substrate.
[0007]
Further, Patent Documents 1 to 3 and Non-Patent Document 1 have flexibility in opposition to a stabilizing member in order to stabilize surface blurring in an optical disk by utilizing aerodynamic action force according to Bernoulli's law. There is a description of a recording / reproducing apparatus configured to rotate an optical disk or a flexible optical disk.
[0008]
[Patent Document 1]
JP-A-7-105657
[0009]
[Patent Document 2]
Japanese Patent Laid-Open No. 10-308059
[0010]
[Patent Document 3]
JP 2003-115108 A
[0011]
[Non-Patent Document 1]
“Optical Readout of Video Disc”, “EITA TRANSPORTATION ON CONSUMER ELECTRONICS”, November 1976, p. 304-308
[0012]
[Problems to be solved by the invention]
However, in the prior art, when the optical disk substrate is formed of a rigid body, in order to reduce the surface blur and tilt in the rotating optical disk, the recording is performed at a low temperature so as to form a very accurate shape and prevent thermal deformation. A film must be deposited. This prolongs the tact time associated with optical disc manufacture and increases costs.
[0013]
Further, as described in Patent Documents 1 and 2, the method of rotating a flexible optical disk on a stabilizing plate has a high risk of sliding between the optical disk and the stabilizing plate. There is a problem that the surface of the chemical plate is damaged. This sliding causes dust generation, which causes an error.
[0014]
In particular, as described in Patent Document 1, when the recording film is present on the stabilizing plate side, the recording film of the optical disk is damaged by sliding, and an error is directly caused. Moreover, there is a limit to the effect of reducing the disc surface shake by simply using a flat stabilizer, and the risk of collision between the objective lens and the disc is still a problem when using a high NA objective lens. It remains.
[0015]
As one of the methods using the stabilizing plate, there is a method as described in Non-Patent Document 1, but it is the same as the above technique in terms of the configuration of using a planar stabilizing plate, and the same problem Is expected to occur. In this method, it is assumed that an aerodynamic force acts between a stabilizing plate called “smoothing plates” and the disc. For example, the direction in which the disc is separated from the stabilizing plate. If the shape is warped, the aerodynamic force does not act effectively, and the disc surface blur cannot be controlled. In addition, since the aerodynamic force is generated by utilizing the phenomenon that the disk hangs down due to gravity, it cannot cope with the vertical placement of the drive device.
[0016]
As one means for solving these problems, the present inventor uses a columnar stabilization guide member whose surface facing the optical disc forms an arc shape in Patent Document 3 and the like, and a stabilization guide member in the optical disc. A region where no air pressure action is generated (a space without a stabilizing guide member) is provided on the upstream and downstream sides of the disk rotation direction at the part where the surface shake due to the air pressure action is stable. An invention that increases the effect of the stabilizing force by aerodynamic force by reducing the repulsive force in the optical disc at the portion where the surface blurring is stabilized by making the optical disc have a portion that becomes “escape” before and after the portion. Proposed.
[0017]
According to the invention of Patent Document 3, it is possible to surely suppress surface deflection of a flexible optical disc, enable high-density recording, and prevent occurrence of problems such as sliding contact with an objective lens. On the other hand, this realization requires complicated position adjustment control of the stabilizing guide member and the recording / reproducing head, which not only increases the load on the drive control system, but also significantly increases the device cost. Become.
[0018]
Therefore, as one means for solving such a problem, the present inventor proposed a recording / reproducing apparatus having a configuration as shown in FIGS. 14 to 16 in Japanese Patent Application No. 2003-19087.
[0019]
14 is a plan view of the main part of the recording / reproducing apparatus, FIG. 15 is a cross-sectional view taken along the line EE ′ in FIG. 14, FIG. 16 is a front view of the recording / reproducing apparatus in FIG. An optical disk, which is a recording disk, 2 is a hub which is one holding member for rotating the optical disk 1 mounted on the rotation center (center) portion of the optical disk 1, and 3 is a chucking portion which is the other holding member The spindle motor 4 for rotating the optical disc 1 by fitting it to the hub 2 moves in the radial direction of the optical disc 1 to focus the light beam on the optical disc 1 and perform information recording / reproduction processing. This is an optical pickup of recording / reproducing means that performs optical scanning (direction of flow line R) on the optical disc 1.
[0020]
Further, reference numeral 5 moves in the radial direction of the optical disc 1 together with the optical pickup 4 and uses the aerodynamic action force according to Bernoulli's law to cause the optical disc surface blur at least near the recording / reproducing position by the optical pickup 4. The main stabilizing member 6 for suppressing the same is an auxiliary stabilizing member for applying an aerodynamic acting force to the optical disc 1, and the main stabilizing member 5 and the auxiliary stabilizing member 6 are used for recording on the optical disc 1. It is arranged on the disk substrate side opposite to the surface.
[0021]
Further, in this example, the auxiliary stabilizing member 6 is close to the flow line R that moves for the optical pickup 4 to scan in the plane of the optical disk 1 and passes through the vicinity of the center of the optical disk 1 (the flow line R in the figure). Although described above, including those in the vicinity of the flow line R), each of the two regions S1 and S2 separated by A is independently disposed at a symmetrical position with respect to the main stabilizing member 5. ing.
[0022]
In this manner, in addition to the main stabilizing member 5 disposed in the vicinity of the optical pickup 4, the auxiliary stabilizing member 6 is disposed at the specific position as described above, whereby the optical disk 1 on which the main stabilizing member 5 is located. An action force that opposes the main stabilizing member 5 is generated, and the effect of stabilizing the disc surface blurring by the aerodynamic force can be obtained without greatly pushing the main stabilizing member 5 into the optical disc 1.
[0023]
In the invention of the configuration shown in FIGS. 14 to 16, compared to the case where only one main stabilization member 5 is used, a sufficient surface blur reduction effect is obtained at a position where the pushing amount of the main stabilization member 5 is shallow, As a result, the flow line in the radial direction of the disk in the main stabilizing member 5 and the optical pickup 4 can be limited to a range close to the disk reference plane, so that the operation mechanism can be simplified.
[0024]
14 to 16, 21 is a proximity point (action point) between the auxiliary stabilization member 6 and the optical disc 1, 22 is a proximity region between the auxiliary stabilization member 6 and the optical disc 1, and 23 is an operation of the auxiliary stabilization member 6. The center of the surface is shown.
[0025]
However, in the present invention, for example, when the columnar auxiliary stabilizing member 6 having an arcuate surface facing the optical disk 1 is used, strictly as shown in FIG. There is a case in which the acting point 23 is shifted from the auxiliary stabilizing member 6 and the proximity point 21 of the optical disc 1 and the aerodynamic force by the auxiliary stabilizing member 6 does not sufficiently act. In some cases, this phenomenon causes the sliding contact between the optical disc 1 and the auxiliary stabilizing member 6, which becomes a problem in the reliability of recording / reproducing in this apparatus.
[0026]
The object of the present invention is to solve the above-mentioned problems and to optimize the aerodynamic acting force by the auxiliary stabilizing member in the configuration of the main stabilizing member and the auxiliary stabilizing member that causes the Bernoulli effect to act. Recording / playback device and stabilization adjustment method to reduce disc wobbling The law It is to provide.
[0027]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the invention according to claim 1 is characterized in that a flexible recording disk is rotated and the surface fluctuation of the recording disk at least near the recording / reproducing position is suppressed by utilizing the Bernoulli effect. A stabilizing member and recording / reproducing means for performing recording and / or reproduction on a surface opposite to a main working surface of the Bernoulli effect of the recording disk, and the recording / reproducing means is disposed within the surface of the recording disk. The main stabilizing member is divided into two areas by a straight line A that is close to the scanning flow line and passes through the vicinity of the center of the recording disk, and an aerodynamic force is generated in each of the two areas. A recording / reproducing apparatus in which an auxiliary stabilizing member is disposed so as to generate an acting force that opposes the main stabilizing member on the surface of the recording disk on which the recording medium is positioned. Both the tilt adjusting means for tilting the aerodynamic force acting surface of the adjusting member at the same tilt angle in the disc radial direction and both the auxiliary stabilizing members are pushed into the recording disc surface with the same pushing amount. And a position control means for setting the position of the auxiliary stabilizing member. With this configuration, each auxiliary stabilizing member can be adjusted by adjusting / setting the tilt angle and the pushing amount by the inclination adjusting means and the position controlling means for each auxiliary stabilizing member. The surface of the recording disk on which the main stabilizing member is located can be surely applied to the aerodynamic force of each auxiliary stabilizing member against the recording disk while avoiding sliding between the stabilizing member and the recording disk Thus, it is possible to efficiently generate the acting force that opposes the main stabilizing member. Thereby, the flow line in the disk radial direction in the main stabilizing member and the recording / reproducing means can be limited to a range close to the disk reference plane, and the operation mechanism can be simplified.
[0028]
According to a second aspect of the present invention, there is provided a main stabilizing member that rotates a flexible recording disk and uses a Bernoulli effect to suppress at least a recording / reproducing position near the recording / reproducing position, and a main stabilization member. Recording / reproducing means for recording and / or reproducing on the surface opposite to the main Bernoulli effect surface of the disk, and in the plane of the recording disk close to the flow line scanned by the recording / reproducing means. And the recording disk surface on which the main stabilizing member is located by dividing the two areas by a straight line A passing through the vicinity of the center of the recording disk and generating an aerodynamic force in each of the two areas. Recording / reproducing apparatus provided with an auxiliary stabilizing member so as to generate an acting force that opposes the main stabilizing member, wherein aerodynamics in each auxiliary stabilizing member Both the tilt adjusting means for tilting the acting surfaces of the various forces at the same tilt angle in the disc circumferential direction and the auxiliary stabilizing members are set so that the recording disc surface is pushed in with the same pushing amount. Each of the auxiliary stabilizing members and the recording disk by adjusting / setting the tilt angle and the pushing amount by the inclination adjusting means and the position controlling means for each auxiliary stabilizing member. In this way, the aerodynamic force of each auxiliary stabilizing member against the recording disk can be surely applied to the recording disk surface where the main stabilizing member is located. It is possible to efficiently generate the acting force facing the member. Thereby, the flow line in the disk radial direction in the main stabilizing member and the recording / reproducing means can be limited to a range close to the disk reference plane, and the operation mechanism can be simplified.
[0029]
According to a third aspect of the present invention, in the recording / reproducing apparatus according to the first or second aspect, the center of rotation when the auxiliary stabilizing member is tilted is set near the point of action on the working surface of the auxiliary stabilizing member. With this configuration, even when the tilt angle of the auxiliary stabilizing member is adjusted, it is possible to fix the action point position that is the final target. That is, if the action point is set to be the disk rotation center position according to the tilt angle of the auxiliary stabilizing member, the rotation center and the action point can always be matched. Thereby, even when the position of the auxiliary stabilizing member is adjusted based on the rotation center, the operation point position can be managed by the rotation center position by this operation.
[0030]
According to a fourth aspect of the present invention, in the recording / reproducing apparatus according to the first or second aspect, storage means for storing in advance information on an appropriate inclination angle set in the auxiliary stabilizing member for each disk specification of the recording disk. And the tilt adjustment means can adjust the tilt according to the disk specifications. With this configuration, the operation of the auxiliary stabilizing member can be optimized for various disk specifications.
[0031]
According to the fifth aspect of the present invention, in the recording / reproducing apparatus according to the first or second aspect, the disc specification range that can be used in the device is limited, and the auxiliary stabilizing member set in the disc specification range is appropriate. Based on the center value of the tilt angle, the tilt of the auxiliary stabilizing member is fixed. With this configuration, the fixed auxiliary stabilizing member placement condition can be applied to discs of arbitrary specification range, thereby stabilizing the auxiliary. The mechanism of the member can be simplified. Further, the auxiliary stabilizing member can be fixed to the disk cartridge.
[0032]
According to a sixth aspect of the present invention, there is provided a main stabilizing member that rotates a flexible recording disk and suppresses the surface deviation of the recording disk at least near the recording / reproducing position by utilizing the Bernoulli effect, and the recording Recording / reproducing means for recording and / or reproducing on the surface opposite to the main Bernoulli effect surface of the disk, and in the plane of the recording disk close to the flow line scanned by the recording / reproducing means. And the recording disk surface on which the main stabilizing member is located by dividing the two areas by a straight line A passing through the vicinity of the center of the recording disk and generating an aerodynamic force in each of the two areas. In the recording / reproducing apparatus provided with an auxiliary stabilizing member so as to generate an acting force that opposes the main stabilizing member. By inclining the working surface of the aerodynamic force of the stabilizing member at the same tilt angle in the disk radial direction, and pushing the recording disk surface with the same pushing amount together with the auxiliary stabilizing members, The acting force that opposes the main stabilizing member is optimized, and with this configuration, the tilt angle and the pushing amount with respect to each auxiliary stabilizing member are adjusted / set, thereby recording each auxiliary stabilizing member and recording. While avoiding sliding with the disc, the aerodynamic force of each auxiliary stabilizing member against the recording disc can be surely applied, and the main stability on the recording disc surface where the main stabilizing member is located. It is possible to efficiently generate the acting force that opposes the forming member. Thereby, the flow line in the disk radial direction in the main stabilizing member and the recording / reproducing means can be limited to a range close to the disk reference plane, and the operation mechanism can be simplified.
[0033]
According to a seventh aspect of the present invention, there is provided a main stabilizing member that rotates a flexible recording disk and uses the Bernoulli effect to suppress at least the recording / reproducing position near the recording / reproducing position, and the recording stabilization Recording / reproducing means for recording and / or reproducing on the surface opposite to the main Bernoulli effect surface of the disk, and in the plane of the recording disk close to the flow line scanned by the recording / reproducing means. And the recording disk surface on which the main stabilizing member is located by dividing the two areas by a straight line A passing through the vicinity of the center of the recording disk and generating an aerodynamic force in each of the two areas. In the recording / reproducing apparatus provided with an auxiliary stabilizing member so as to generate an acting force that opposes the main stabilizing member. By inclining the working surface of the aerodynamic force of the stabilizing member at the same tilt angle in the circumferential direction of the disc, and by pushing the recording disc surface with the same pushing amount together with the auxiliary stabilizing members. The operation force facing the main stabilization member is optimized, and by this configuration, the tilt angle and the pushing amount with respect to each auxiliary stabilization member are adjusted / set, The aerodynamic force of each auxiliary stabilizing member against the recording disk can be surely applied while avoiding sliding with the recording disk, and the main stabilizing member is located on the surface of the recording disk. It is possible to efficiently generate the acting force that opposes the stabilizing member. Thereby, the flow line in the disk radial direction in the main stabilizing member and the recording / reproducing means can be limited to a range close to the disk reference plane, and the operation mechanism can be simplified.
[0034]
According to an eighth aspect of the present invention, in the stabilization adjustment method of the recording / reproducing apparatus according to the sixth or seventh aspect, information on an appropriate inclination angle of the auxiliary stabilizing member is stored in advance for each arbitrary disk specification of the recording disk. In addition, the inclination of the auxiliary stabilizing member is adjusted according to the disk specifications. With this configuration, it is possible to optimize the operation of the auxiliary stabilizing member for various disk specifications. .
[0035]
According to a ninth aspect of the present invention, in the stabilization adjustment method for a recording / reproducing apparatus according to the sixth or seventh aspect, the disk specification range used in the apparatus is limited, and the inclination of the auxiliary stabilizing member is set to the disk specification. This is characterized in that it is fixedly set to the center value of the appropriate inclination angle of the auxiliary stabilizing member determined by the range, and by this configuration, the arrangement condition of the fixed auxiliary stabilizing member can be applied to a disc of an arbitrary specification range. In addition, the mechanism of the auxiliary stabilizing member can be simplified. Further, the auxiliary stabilizing member can be fixed to the disk cartridge.
[0036]
According to a tenth aspect of the present invention, in the stabilization adjustment method for a recording / reproducing apparatus according to the sixth or seventh aspect, the effect of the aerodynamic force of the auxiliary stabilizing member is adjusted by adjusting the inclination of the auxiliary stabilizing member. The point is set at the substantial rotation center of the auxiliary stabilizing member, and this configuration makes it possible to optimize the operation of the auxiliary stabilizing member for various disk specifications.
[0038]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0039]
1 is a plan view of a main part for explaining a reference example of the recording / reproducing apparatus of the present invention, FIG. 2 (a) is a cross-sectional view taken along the line EE 'in FIG. 1, and FIG. 2 (b) is in FIG. FIG. 3 is a front view of the recording / reproducing apparatus in FIG. 1, 1 is an optical disc that is a flexible recording disc, and 2 is attached to the rotation center (center) portion of the optical disc 1. A hub 3 as a holding member for holding the optical disc 1 rotated to rotate it, a spindle motor 4 for rotating the optical disc 1 by fitting a chucking portion as the other holding member into the hub 2, Recording / reproducing means that moves in the radial direction of the optical disc 1 to focus the light beam on the optical disc 1 and performs optical scanning (direction of flow line R) on the optical disc 1 to perform information recording / reproduction processing. There is an optical pickup.
[0040]
Further, 5 is a main stabilization in which the optical disk 1 side protrudes in an arc shape when viewed from the front, and moves in the optical pickup scanning flow line R direction in the disk radial direction in synchronization with the movement of the optical pickup 4 as shown in FIG. The main stabilization member 5 uses aerodynamic action force according to Bernoulli's law to suppress surface blurring at least near the recording / reproducing position of the optical pickup 4 in the optical disc 1.
[0041]
Further, reference numeral 6 denotes an auxiliary stabilizing member that acts together with the main stabilizing member 5 to apply an aerodynamic acting force to the optical disc 1. The main stabilizing member 5 and the auxiliary stabilizing member 6 are optical discs. 1 is disposed on the side of the disk substrate opposite to the recording surface.
[0042]
In the reference example, a straight line that is close to the flow line R that moves for the optical pickup 4 to scan in the plane of the optical disk 1 and passes near the center of the optical disk 1 (shown on the flow line R in the figure, Of the two regions S1 and S2 divided by A) (including those in the vicinity of the flow line R), the region S2 located downstream of the optical pickup 4 in the optical disc rotation direction is independent of the main stabilization member 5. At least one auxiliary stabilizing member 6 (only one is shown in the reference example) is provided.
[0043]
The main stabilizing member 5 is provided with a movement control mechanism 11 in the disk radial direction and a position control mechanism 12 in the disk rotation axis direction, and each auxiliary stabilization member 6 has a position control mechanism in the disk rotation axis direction. 13 and a tilt control mechanism 14 which is a tilt adjustment means in the disk radial direction and the disk circumferential direction. The movement control mechanism 11, the position control mechanisms 12 and 13, and the tilt control mechanism 14 are each set of various setting data, etc. Is controlled by a drive unit 16 that receives control data from a memory 15 that stores.
[0044]
The rotation center in the tilt angle control of the tilt angle control mechanism 14 of the auxiliary stabilizing member 6 is the position of the action surface center (action point) 23 of the auxiliary stabilizing member 6. 1 to 3, reference numeral 21 denotes a proximity point between the auxiliary stabilization member 6 and the optical disc 1, and 22 denotes a proximity region between the auxiliary stabilization member 6 and the optical disc 1.
[0045]
4 is a plan view of an essential part for explaining the first embodiment of the recording / reproducing apparatus of the present invention, FIG. 5 (a) is a sectional view taken along the line EE ′ in FIG. 4, and FIG. 5 (b) is FIG. FIG. In the following description, members corresponding to those already described are denoted by the same reference numerals, and detailed description thereof is omitted.
[0046]
The first embodiment is different from the reference example in that at least the auxiliary stabilizing member 6 is provided independently of the main stabilizing member 5 in each of the two regions S1 and S2 divided in the same manner as described in the reference example. One by one (one in each region in the first embodiment) is arranged at a symmetrical position.
[0047]
6 is a plan view of an essential part for explaining the second embodiment of the recording / reproducing apparatus of the present invention, FIG. 7A is a sectional view taken along the line EE ′ in FIG. 6, and FIG. FIG. 7 (a), (b) is a cross-sectional view taken along line FF ′ in FIG. 5 and shows that the second embodiment is different from the first embodiment in comparison with FIGS. 5 (a), 5 (b). The adjustment direction of the disc circumferential direction inclination of the auxiliary stabilizing member 6 as shown in FIG.
[0048]
The operation of the reference example and the embodiment will be described.
[0049]
In order to suppress disc surface blurring by generating an aerodynamic force according to Bernoulli's law between the stabilizing member which is the basic configuration in the reference example and the embodiment and the flexible disc, The balance condition between the adjusting member and the disk is important, and in particular, the reaction force toward the stabilizing member of the disk is an important parameter. Since this reaction force is determined by the rigidity of the disk and the levitation force generated by the disk rotating and flattening, in principle, the balance condition is the radial position of the stabilizing member, the disk rotation speed, In addition, the disk specification depends on the parameters, and a complicated adjustment drive mechanism is required.
[0050]
As a result of various experiments and considerations regarding this point, when an aerodynamic force is applied to the disk surface by an arbitrary stabilizing member, approximately ± 90 upstream and downstream of the disk rotating direction in the stabilizing member. This shows the phenomenon that the disk surface near the angle approaches the disk reference surface when the disk is considered as an ideal plane.
[0051]
Therefore, the phenomenon that the disk surface at a position shifted by ± 90 degrees from any stabilizing member approaches the disk reference surface is used as the reaction force described above to adjust the balance condition between the stabilizing member and the disk. As a result, the effect of stabilizing the disk surface efficiently was obtained.
[0052]
However, at the position of the stabilizing member (auxiliary stabilizing member) used for adjustment, as shown in FIGS. 14 to 16, the point of action of the aerodynamic force deviates from the center point of the auxiliary stabilizing member. As a result, it has been clarified that the effect of the auxiliary stabilizing member described above may be hindered due to this deviation. In this regard, various further experiments were conducted and considerations were made. As a result, by adjusting the tilt angle of the auxiliary stabilizing member, the center point of the auxiliary stabilizing member 6 and the action of the aerodynamic force of the auxiliary stabilizing member. We found that the points can be matched.
[0053]
In the present embodiment, the point of action of the aerodynamic force of the auxiliary stabilizing member 6 is adjusted to an appropriate position by the tilt angle of the auxiliary stabilizing member 6, and the aerodynamic force of the auxiliary stabilizing member 6 on the optical disc 1 is adjusted. Is made to work reliably.
[0054]
In the reference example, by appropriately applying the aerodynamic force of the auxiliary stabilizing member 6 to the optical disc 1, it is possible to efficiently generate a force in which the optical disc 1 faces the main stabilizing member 5, A sufficient surface blur reduction effect was obtained at the moving position of the main stabilizing member 5. As a result, the flow line R in the disk radial direction of the main stabilizing member 5 and the optical pickup 4 is positioned in a range (a relatively wide region illustrated by hatching) H close to the disk reference surface in which the surface shake is suppressed. Therefore, the adjustment mechanism for this purpose can be given a margin, and the adjustment mechanism can be simplified.
[0055]
Note that the configuration of the reference example is that the optical disk 1 in which the disk surface on the downstream side of the main stabilization member 5 is displaced to the side close to the main stabilization member 5 when the apparatus is configured by only the main stabilization member 5. For example, the optical disc 1 in which the static warp shape of the optical disc 1 is convex toward the optical pickup 4 corresponds to this. In this case, the tilt angle of the auxiliary stabilizing member is adjusted in the direction in which the outer peripheral side is brought closer to the optical pickup with respect to the radial direction of the disc, and in the clockwise direction toward the disc center with respect to the disc circumferential direction (auxiliary stabilizing member). The direction in which the upstream side of the disk rotates closer to the disk was appropriate.
[0056]
Further, for example, when the apparatus is configured only by the main stabilization member 5, the optical disc 1 (the optical disc 1 of the optical disc 1) in which the upstream disc surface of the main stabilization member 5 is displaced toward the side close to the main stabilization member 5. In the optical disk 1 in which the static warp shape is concave on the optical pickup 4 side), a configuration in which the disk rotation direction is reversed by modifying the reference example can be applied. By appropriately applying the aerodynamic force of the stabilizing member 6 to the optical disc 1, it is possible to efficiently generate a force in which the optical disc 1 faces the main stabilizing member 5, and the main stabilizing member 5. A sufficient surface blur reduction effect was obtained at the moving position. At this time, the tilt angle of the auxiliary stabilizing member 6 is adjusted in a direction in which the outer peripheral side is brought closer to the optical pickup 4 with respect to the radial direction of the disc and in a clockwise direction toward the disc center with respect to the disc circumferential direction ( The direction in which the disk rotation downstream side of the auxiliary stabilizing member approaches the disk was appropriate.
[0057]
Also in the configuration of the first embodiment, by causing the aerodynamic force of both auxiliary stabilizing members 6 to act appropriately on the optical disc 1, a force for causing the optical disc 1 to oppose the main stabilizing member 5 is efficiently generated. A sufficient surface blurring reduction effect was obtained at the movement position of the main stabilizing member 5.
[0058]
Thereby, the flow line R in the disc radial direction in the main stabilizing member 5 and the optical pickup 4 is positioned in a range (a relatively wide region illustrated by oblique lines) H close to the disc reference plane in which surface deflection is suppressed. Therefore, the adjustment mechanism for this purpose can be given a margin, and the adjustment mechanism can be simplified.
[0059]
The configuration of the first embodiment is such that when the apparatus is composed of only the main stabilizing member 5, the disc surface on the downstream side of the main stabilizing member 5 is displaced toward the side close to the main stabilizing member 5. For example, the optical disc 1 in which the static warp shape of the optical disc 1 is convex toward the optical pickup 4 corresponds to this. At this time, the tilt angles of the auxiliary stabilizing members 6 are adjusted in such a direction that the outer peripheral side is brought closer to the optical pickup 4 with respect to the radial direction of the disc, and a clockwise direction toward the disc center with respect to the disc circumferential direction. (The direction in which the disk rotation upstream side of the auxiliary stabilizing member 6 approaches the optical disk 1) was appropriate.
[0060]
Also in the configuration of the second embodiment, by causing the aerodynamic force of both auxiliary stabilizing members 6 to act appropriately on the optical disc 1, the force that causes the optical disc 1 to oppose the main stabilizing member 5 is efficiently generated. A sufficient surface blurring reduction effect was obtained at the movement position of the main stabilizing member 5.
[0061]
Thereby, the flow line R in the disc radial direction in the main stabilizing member 5 and the optical pickup 4 is positioned in a range (a relatively wide region illustrated by oblique lines) H close to the disc reference plane in which surface deflection is suppressed. Therefore, the adjustment mechanism for this purpose can be given a margin, and the adjustment mechanism can be simplified.
[0062]
Note that the configuration of the second embodiment is an optical disc in which the upstream side disc surface of the main stabilization member 5 is displaced toward the side close to the main stabilization member 5 when the apparatus is configured by only the main stabilization member 5. For example, the optical disc 1 in which the static warp shape of the optical disc 1 is concave on the optical pickup 4 side corresponds to this. In this case, the tilt angles of the auxiliary stabilizing members 6 are adjusted in a direction in which the outer peripheral side is brought closer to the optical pickup with respect to the disc radial direction and in a counterclockwise direction toward the disc center with respect to the disc circumferential direction ( The direction in which the disk rotation downstream side of the auxiliary stabilizing member 6 approaches the disk was appropriate.
[0063]
In the configuration of the first and second embodiments, a position control mechanism or a tilt control system in the direction of the disk rotation axis is added to the main stabilizing member 5 to perform fine adjustment with higher accuracy, so that the recording / reproducing position can be adjusted. It was also possible to optimize the surface blur.
[0064]
FIG. 8 is a plan view of an essential part for explaining a modification of Embodiment 2 of the recording / reproducing apparatus of the present invention, FIG. 9A is a cross-sectional view taken along the line EE ′ in FIG. 8, and FIG. FIG. 8 is a cross-sectional view taken along line FF ′ in FIG. 8. In the second embodiment, the hub 2 of the optical disc 1 is connected to the chuck of the spindle motor 3 shown in FIG. 3 as in the modified examples shown in FIGS. A peripheral portion (circular region in FIG. 8) connecting the fulcrum positions (the outer periphery of the hub 2 in FIG. 8) where the optical disc 1 starts to bend when the stabilizing members 5 and 6 are pushed and bent on the king portion. ) And a straight line A passing through two points intersecting and perpendicular to the straight line A, that is, on a disc surface sandwiched between a straight line B1 closer to the main stabilizing member 5 and a straight line B2 farther from the main stabilizing member 5. In the region C, the auxiliary stabilizing member 6 is located near the straight line B1 on the side close to the main stabilizing member 5. With the structure disposing the use point 23, to further reduce the disk surface vibration at the movement position of the main stabilizing member 5, was obtained exerts sufficient effect described above.
[0065]
In addition, as the inclination adjustment of the auxiliary stabilizing member 6 in the embodiment, for each disk specification of the optical disk used in the apparatus, an optimum of the auxiliary stabilizing member 6 set in accordance with the disk specification by performing a test or the like in advance. The tilt angle information is stored in the memory 15 shown in FIG. 3, and when the optical disc is loaded into the apparatus, the proper tilt angle information corresponding to the disc specification of the optical disc is automatically read from the memory 15 to thereby provide a tilt control mechanism. It is conceivable to adjust the inclination by driving 14.
[0066]
Furthermore, the disc specification range that can be used in the apparatus is limited, the inclination is fixed based on the center value of the appropriate inclination angle of the auxiliary stabilization member 6 set in the disc specification range, and the auxiliary stabilization member 6 is placed in place. You may make it install in. By doing in this way, the arrangement | positioning conditions of the fixed auxiliary stabilization member 6 can be applied to the disk of arbitrary specification ranges, and the mechanism of the auxiliary stabilization member 6 can be simplified.
[0067]
In each of the above embodiments, the auxiliary stabilizing member 6 is provided in the housing 30 of the apparatus main body as illustrated in FIG. 10, so that a disk cartridge for storing the optical disk is not used or the optical disk is removed from the disk cartridge. The present invention can be implemented in a recording / reproducing apparatus that is taken out and driven.
[0068]
Further, as shown in FIG. 11, the auxiliary stabilizing member 6 in each of the above embodiments can be provided on the inner wall of the disc cartridge 31. With this configuration, the configuration on the recording / reproducing apparatus side is configured. It can be simplified. Further, in this configuration, since the auxiliary stabilizing member 6 can be individually set in the disk cartridge 31, the auxiliary stabilizing member 6 can be individually designed for each of various disk specifications, and stabilization due to variations in disk specifications. It is also possible to correct the deviation of conditions.
[0069]
Examples of the disk cartridge 31 include those shown in FIGS. 12 and 13, 32 is a first through-hole portion for allowing the main stabilizing member 5 to be inserted and moving in the radial direction of the disk, 33 is a portion of the optical pickup 4 and the spindle motor 3. This is a second through hole that is inserted and allows the optical pickup 4 to move in the radial direction of the disk. A shutter for opening and closing the through holes 32 and 33, a mechanism for fixing the optical disc 1 in the cartridge, and other mechanisms necessary for installing the cartridge in the spindle motor 3 are illustrated. Not.
[0070]
In the above embodiment, the configuration example in which the auxiliary stabilizing member is disposed on the same side as the main stabilizing member has been described. However, the auxiliary stabilizing member may be disposed on the opposite side of the main stabilizing member and the disk. The disc surface shake reduction effect can be obtained.
[0071]
Next, the present invention will be described more specifically based on reference examples, examples, and comparative examples.
[0072]
(Reference Example 1)
In Reference Example 1, the configuration shown in FIG. 1 and FIG. 2 is adopted, and the auxiliary stabilizing member 6 has a cylindrical shape with a diameter of 15 mm and a surface facing the optical disc (diameter 120 mm) 1 having a curvature radius of 100 mm. The main stabilizing member 5 has a cylindrical shape with a diameter of 10 mm and a surface facing the optical disc 1 with a radius of curvature of 100 mm. Further, the auxiliary stabilizing member 6 is disposed at a position of 90 degrees downstream of the main stabilizing member 5 in the disk rotation direction, and the center of the disk facing surface is positioned at a radius of 45 mm of the optical disk 1. Although not shown, the main stabilization member 5 is provided with a moving mechanism in the disk radial direction and a position control mechanism in the disk rotation axis direction, and the auxiliary stabilization member 6 is provided with a position control mechanism in the disk rotation axis direction. And a tilt control mechanism in the disc radial direction and the disc circumferential direction. The rotation center in the tilt angle control of the tilt control mechanism of the auxiliary stabilizing member 6 is the center position of the working surface of the auxiliary stabilizing member.
[0073]
Reference Example 1 describes a case where a polycarbonate sheet having a thickness of 120 mm and a thickness of 75 μm is used as a disk substrate. In preparing the disk, first, a groove having a stamper pitch of 0.6 μm and a width of 0.3 μm is transferred to the sheet by thermal transfer, and then the sheet / Ag reflection layer 120 nm / (ZrO) by sputtering. ₂ -Y ₂ O ₃ ) -SiO ₂ 7nm / AgInSbTeGe 10nm / ZnS-SiO ₂ 25nm / Si ₃ N ₄ Films were formed in the order of 10 nm. The information recording area was set in a range from an inner diameter of 40 mm to an outer diameter of 118 mm (radius 20 mm to 58 mm). Thereafter, a UV resin was spin-coated and cured by ultraviolet irradiation to form a transparent protective film having a thickness of 5 μm. Further, a hard coat having a thickness of 10 μm was applied to the opposite surface. A hub 2 having an outer diameter of 30 mm, an inner diameter of 15 mm, and a thickness of 0.3 mm was attached to the center of the disk. The finished state of the disk was slightly warped to the hard coat side.
[0074]
The optical disk 1 is rotated at a disk rotational speed of 15 m / sec, the auxiliary stabilizing member and the main stabilizing member are arranged at predetermined positions to stabilize the disk surface vibration, and a laser displacement meter is arranged at the position of the optical pickup 4. The disc surface blur was evaluated. Further, contact between the auxiliary stabilizing member and the recording disk was detected by an AE sensor (not shown) arranged on the auxiliary stabilizing member, and the contact sliding state was evaluated. Here, the auxiliary stabilizing member is tilted by 1 degree in the direction in which the outer peripheral portion is brought close to the optical pickup with respect to the disk radial direction, and 0.7 degrees in the clockwise direction toward the disk center with respect to the disk circumferential direction, Further, it was arranged at a position where the disk reference surface was pushed in by 0.5 mm. The disk reference surface here is a disk surface on the side of the main stabilizing member 5 when the disk is assumed to be ideally flat, and the auxiliary stabilizing member 6 that determines the pushing amount. The reference position was the center position for tilt angle control.
[0075]
(Reference Example 2)
In Reference Example 2, based on the configuration of Reference Example 1, the position of the auxiliary stabilizing member 6 is 90 degrees upstream of the main stabilizing member 5 in the disk rotation direction, and the center of the disk facing surface is the disk. The arrangement was changed to a position with a radius of 45 mm.
[0076]
Further, the optical disk 1 was configured such that the hard coat was omitted from the specification of the reference example 1. As a result, the finished state of the optical disc 1 was slightly warped toward the transparent protective film side.
[0077]
The optical disk 1 is rotated at a disk rotational speed of 15 m / sec, the auxiliary stabilizing member and the main stabilizing member are arranged at predetermined positions to stabilize the disk surface vibration, and a laser displacement meter is arranged at the position of the optical pickup 4. The disc surface blur was evaluated. Further, contact between the auxiliary stabilizing member and the recording disk was detected by an AE sensor (not shown) arranged on the auxiliary stabilizing member, and the contact sliding state was evaluated. Here, the auxiliary stabilizing member is tilted 2 degrees in the direction in which the outer peripheral portion is brought closer to the optical pickup with respect to the disk radial direction, and 1 degree in the counterclockwise direction toward the disk center with respect to the disk circumferential direction. The disk was placed at a position where it was pushed in by 1 mm with reference to the disk reference surface. The disk reference surface here is a disk surface on the side of the main stabilizing member 5 when the disk is assumed to be ideally flat, and the auxiliary stabilizing member 6 that determines the pushing amount. The reference position was the center position for tilt angle control.
[0078]
(Example 1)
In the first embodiment, the configuration shown in FIGS. 4 and 5 is adopted, and both auxiliary stabilizing members 6 have a cylindrical shape with a diameter of 15 mm with a curvature radius of 100 mm on the surface facing the optical disc (diameter 120 mm) 1. The main stabilizing member 5 has a cylindrical shape with a diameter of 10 mm and a surface facing the optical disc 1 with a radius of curvature of 100 mm. Both auxiliary stabilizing members 6 are arranged so that the center of the disk facing surface is at a position of a radius of 45 mm of the optical disk 1 at both positions of 90 degrees upstream and downstream in the disk rotation direction of the main stabilizing member 5. Although not shown, the main stabilizing member 5 is provided with a moving mechanism in the disk radial direction and a position control mechanism in the disk rotating shaft direction, and both auxiliary stabilizing members 6 have position control in the disk rotating shaft direction. And a tilt control mechanism in the disk radial direction and the disk circumferential direction. Note that the rotation center in the tilt angle control of the tilt angle control mechanism of the auxiliary stabilizing member 6 is the center position of the working surface of the auxiliary stabilizing member.
[0079]
The same optical disk 1 as in Reference Example 1 was used.
[0080]
The optical disk 1 is rotated at a disk rotational speed of 15 m / sec, both auxiliary stabilizing members and the main stabilizing member are arranged at predetermined positions to stabilize the disk surface shake, and a laser displacement meter is arranged at the position of the optical pickup 4 Then, the disc surface shake was evaluated. Further, contact between the auxiliary stabilizing member and the recording disk was detected by an AE sensor (not shown) arranged on the auxiliary stabilizing member, and the contact sliding state was evaluated. Here, both auxiliary stabilizing members are 0.7 degrees in the direction in which the outer peripheral portion is brought closer to the optical pickup with respect to the disk radial direction, and 0.4 in the clockwise direction toward the disk center with respect to the disk circumferential direction. It was arranged at a position where it was tilted by 0.3 mm and the disk reference surface was pushed in by 0.3 mm. Here, the disk reference surface is a disk surface on the side of the main stabilizing member 5 when the disk is assumed to be ideally flat, and both auxiliary stabilizing members that determine the pushing amount. The reference position 6 was the center position for tilt angle control.
[0081]
(Example 2)
In Example 2, the configuration shown in FIG. 6 and FIG. 7 is adopted, and both auxiliary stabilizing members 6 have a cylindrical shape with a diameter of 15 mm with a curvature radius of 100 mm on the surface facing the optical disc (diameter 120 mm) 1. The main stabilizing member 5 has a cylindrical shape with a diameter of 10 mm and a surface facing the optical disc 1 with a radius of curvature of 100 mm. Both auxiliary stabilizing members 6 are arranged so that the center of the disk facing surface is at a position of a radius of 45 mm of the optical disk 1 at both positions of 90 degrees upstream and downstream in the disk rotation direction of the main stabilizing member 5. Although not shown, the main stabilizing member 5 is provided with a moving mechanism in the disk radial direction and a position control mechanism in the disk rotating shaft direction, and both auxiliary stabilizing members 6 have position control in the disk rotating shaft direction. And a tilt control mechanism in the disk radial direction and the disk circumferential direction. The rotation center in the tilt angle control of the tilt control mechanism of the auxiliary stabilizing member 6 is the center position of the working surface of the auxiliary stabilizing member.
[0082]
Further, the optical disk 1 was configured such that the hard coat was omitted from the specification of the reference example 1. As a result, the finished state of the optical disc 1 was slightly warped toward the transparent protective film side.
[0083]
The optical disk 1 is rotated at a disk rotational speed of 15 m / sec, both auxiliary stabilizing members and the main stabilizing member are arranged at predetermined positions to stabilize the disk surface shake, and a laser displacement meter is arranged at the position of the optical pickup 4 Then, the disc surface shake was evaluated. Further, contact between the auxiliary stabilizing member and the recording disk was detected by an AE sensor (not shown) arranged on the auxiliary stabilizing member, and the contact sliding state was evaluated. Here, both auxiliary stabilizing members are tilted by 1 degree in the direction in which the outer peripheral portion is brought closer to the optical pickup with respect to the disk radial direction, and 0.7 degrees in the counterclockwise direction toward the disk center with respect to the disk circumferential direction. In addition, it was arranged at a position where the disc reference surface was pushed in by 0.5 mm. Here, the disk reference surface is a disk surface on the side of the main stabilizing member 5 when the disk is assumed to be ideally flat, and both auxiliary stabilizing members that determine the pushing amount. The reference position 6 was the center position for tilt angle control.
[0084]
(Example 3)
In Example 3, the configuration shown in FIGS. 8 and 9 is adopted, and both auxiliary stabilizing members 6 have a columnar shape with a diameter of 15 mm with a radius of curvature of 100 mm on the surface facing the optical disc (diameter 120 mm) 1. The main stabilizing member 5 has a cylindrical shape with a diameter of 10 mm and a surface facing the optical disc 1 with a radius of curvature of 100 mm. Both auxiliary stabilizing members 6 are arranged so that the center of the disk facing surface is at a position of a radius of 45 mm of the optical disk 1 at both positions at 75 degrees upstream and downstream in the disk rotation direction of the main stabilizing member 5. Although not shown, the main stabilizing member 5 is provided with a moving mechanism in the disk radial direction and a position control mechanism in the disk rotating shaft direction, and both auxiliary stabilizing members 6 have position control in the disk rotating shaft direction. And a tilt control mechanism in the disk radial direction and the disk circumferential direction. The rotation center in the tilt angle control of the tilt control mechanism of the auxiliary stabilizing member 6 is the center position of the working surface of the auxiliary stabilizing member.
[0085]
The same optical disk 1 as in Reference Example 1 was used.
[0086]
The optical disk 1 is rotated at a disk rotational speed of 15 m / sec, both auxiliary stabilizing members and the main stabilizing member are arranged at predetermined positions to stabilize the disk surface shake, and a laser displacement meter is arranged at the position of the optical pickup 4 Then, the disc surface shake was evaluated. Further, contact between the auxiliary stabilizing member and the recording disk was detected by an AE sensor (not shown) arranged on the auxiliary stabilizing member, and the contact sliding state was evaluated. Here, both auxiliary stabilizing members are 0.7 degrees in the direction in which the outer peripheral portion is brought closer to the optical pickup with respect to the disk radial direction, and 0.4 in the clockwise direction toward the disk center with respect to the disk circumferential direction. It was arranged at a position where it was tilted by 0.3 mm and the disk reference surface was pushed in by 0.3 mm. Here, the disk reference surface is a disk surface on the side of the main stabilizing member 5 when the disk is assumed to be ideally flat, and both auxiliary stabilizing members that determine the pushing amount. The reference position 6 was the center position for tilt angle control.
[0087]
(Comparative example)
In this comparative example, the configuration shown in FIG. 14 to FIG. 16 is adopted, and both auxiliary stabilizing members 6 have a columnar shape with a diameter of 15 mm with a curvature radius of 100 mm on the surface facing the optical disc (diameter 120 mm) 1. The main stabilizing member 5 has a cylindrical shape with a diameter of 10 mm and a surface facing the optical disc 1 with a radius of curvature of 100 mm. Both auxiliary stabilizing members 6 are arranged so that the center of the disk facing surface is at a position of a radius of 45 mm of the optical disk 1 at both positions of 90 degrees upstream and downstream in the disk rotation direction of the main stabilizing member 5. Although not shown, the main stabilizing member 5 is provided with a moving mechanism in the disk radial direction and a position control mechanism in the disk rotating shaft direction, and both auxiliary stabilizing members 6 have position control in the disk rotating shaft direction. A mechanism was provided.
[0088]
The same optical disk 1 as in Reference Example 1 was used.
[0089]
The optical disk 1 is rotated at a disk rotational speed of 15 m / sec, both auxiliary stabilizing members and the main stabilizing member are arranged at predetermined positions to stabilize the disk surface shake, and a laser displacement meter is arranged at the position of the optical pickup 4 Then, the disc surface shake was evaluated. Further, contact between the auxiliary stabilizing member and the recording disk was detected by an AE sensor (not shown) arranged on the auxiliary stabilizing member, and the contact sliding state was evaluated. Both auxiliary stabilizing members were arranged at a position where the disk reference surface was pushed in by 0.5 mm. Here, the disk reference surface is a disk surface on the side of the main stabilizing member 5 when the disk is assumed to be ideally flat, and both auxiliary stabilizing members that determine the pushing amount. The reference position of 6 is the center of the working surface of the auxiliary stabilizing member.
[0090]
In the reference example, the example, and the comparative example, the results of testing the disk surface shake at a radius of 55 mm and the sliding state of the disk and the auxiliary stabilizing member when stabilizing the same surface shake are shown in FIG. Came to show.
[0091]
In each embodiment, by adjusting the tilt angle of the auxiliary stabilizing member, as shown in FIGS. 1 to 4, the auxiliary stabilizing member 6 and the optical disc 1 are adjacent to each other, that is, an aerodynamic force acting point, The working surface center 23 of the auxiliary stabilizing member 6, that is, the appropriate point for applying the aerodynamic force of the auxiliary stabilizing member 6 can be adjusted to substantially the same position. An aerodynamic force on the optical disc 1 can be applied reliably.
[0092]
As a first effect by the above action, a good surface blur reduction effect at the movement position of the main stabilizing member 5 was obtained. This is related to the fact that the acting force opposed to the main stabilizing member 5 can be efficiently generated on the optical disk surface on which the main stabilizing member 5 is located by the action of the auxiliary stabilizing member 6.
[0093]
In particular, in the first to third embodiments, the effect of the arrangement form of the auxiliary stabilizing member 6 was added to this effect, and a smaller disc surface fluctuation could be realized.
[0094]
Further, as a second effect by the above action, a floating state between the optical disc 1 and the auxiliary stabilizing member 6 can be realized, and contact sliding between the optical disc / auxiliary stabilizing member can be surely avoided. This is because the point of application of the aerodynamic force by the auxiliary stabilizing member 6 can be adjusted to an appropriate point by adjusting the tilt angle.
[0095]
On the other hand, in the comparative example, as illustrated in FIGS. 14 to 16, the proximity stabilizing point 6 between the auxiliary stabilizing member 6 and the optical disk 1, that is, the point of action of the aerodynamic force is that of the auxiliary stabilizing member 6. The auxiliary stabilizing member 6 is located on the side close to the operating surface boundary region of the auxiliary stabilizing member 6, deviating from the working surface center 23, that is, the appropriate point where the aerodynamic force of the auxiliary stabilizing member is applied. The generation of aerodynamic force due to has become unstable.
[0096]
For this reason, improper vibration is superimposed on the disc surface shake at the position of the main stabilizing member 5, and a sufficient disc surface shake reduction effect cannot be obtained. In addition, since the generation of aerodynamic force by the auxiliary stabilizing member 6 becomes unstable, the flying condition between the auxiliary stabilizing member 6 and the optical disk 1 cannot be established, causing contact sliding, The optical disk 1 has been damaged.
[0097]
As described above, in the present embodiment and the present example, in the configuration of the main stabilizing member and the auxiliary stabilizing member that cause the Bernoulli effect, the aerodynamic acting force by the auxiliary stabilizing member is optimized and recorded. It is possible to provide a recording / reproducing apparatus capable of realizing good disk surface fluctuation reduction at the reproducing position.
[0098]
【The invention's effect】
As described above, the recording / reproducing apparatus and the stabilization adjustment method according to the present invention To the law According to the structure of the main stabilizing member and each auxiliary stabilizing member that causes the Bernoulli effect to act, both the aerodynamic force acting surfaces in each auxiliary stabilizing member are tilt-adjusted at the same tilt angle, and By setting each of the auxiliary stabilizing members to be pushed into the recording disk surface with the same pushing amount, air between each auxiliary stabilizing member and the recording disk is avoided while avoiding sliding between each auxiliary stabilizing member and the recording disk. It is possible to reliably apply a mechanical force, and it is possible to efficiently generate an acting force that opposes the main stabilizing member on the recording disk surface on which the main stabilizing member is located. It can be reduced satisfactorily. Thereby, the flow line in the disk radial direction in the main stabilizing member and the recording / reproducing means can be limited to a range close to the disk reference plane, and the operation mechanism can be simplified.
[Brief description of the drawings]
FIG. 1 is a plan view of a main part for explaining a reference example of a recording / reproducing apparatus of the present invention.
2A is a cross-sectional view taken along line EE ′ in FIG. 1, and FIG. 2B is a cross-sectional view taken along line FF in FIG.
FIG. 3 is a front view of the reference example of FIG.
FIG. 4 is a plan view of a main part for explaining Embodiment 1 of the recording / reproducing apparatus of the present invention.
5A is a cross-sectional view taken along line EE ′ in FIG. 4, and FIG. 5B is a cross-sectional view taken along line FF in FIG.
FIG. 6 is a plan view of a main part for explaining Embodiment 2 of the recording / reproducing apparatus of the present invention.
7A is a cross-sectional view taken along line EE ′ in FIG. 6, and FIG. 7B is a cross-sectional view taken along line FF in FIG.
FIG. 8 is a plan view of a main part for describing a modification of the second embodiment of the recording / reproducing apparatus of the present invention.
9A is a cross-sectional view taken along line EE ′ in FIG. 8, and FIG. 9B is a cross-sectional view taken along line FF in FIG.
FIG. 10 is a cross-sectional view showing an installation example of an auxiliary stabilizing member in the recording / reproducing apparatus of the present embodiment.
FIG. 11 De Sectional view for explaining a disk cartridge
FIG. FIG. Top view of the disc cartridge
13 is a cross-sectional view of the disk cartridge of FIG.
FIG. 14 is a plan view of the main part of a recording / reproducing apparatus as a comparative example of the present invention.
15 is a sectional view taken along line EE ′ in FIG.
FIG. 16 is a front view of the recording / reproducing apparatus in FIG.
FIG. 17 is a diagram showing a list of characteristic evaluations in the reference examples, examples, and comparative examples of the present invention.
[Explanation of symbols]
1 Optical disc
2 Hub
3 Spindle motor
4 Optical pickup
5 Main stabilizer
6 Auxiliary stabilizer
11 Movement control mechanism
12, 13 Position control mechanism
14 Tilt control mechanism
15 memory
16 Drive unit
21 Proximity point between auxiliary stabilizing member and optical disc
22 Proximity region between auxiliary stabilizing member and optical disc
23 Center of action of auxiliary stabilizing member (point of action)
30 Body of the device body
31 disc cartridge
A Extension line of optical pickup flow line
B1, B2 A straight line passing through the circumference of the hub and perpendicular to the straight line A
R flow line
S1, S2, C Areas divided in the plane of the recording disk

Claims

A main stabilizing member that rotates a recording disk having flexibility and uses the Bernoulli effect to suppress surface blurring of the recording disk at least in the vicinity of the recording / reproducing position; and a working surface of the main Bernoulli effect of the recording disk; Comprises recording / reproducing means for recording and / or reproducing on the opposite side,
The surface of the recording disk is divided into two areas by a straight line A that is close to the flow line scanned by the recording / reproducing means and passes near the center of the recording disk, and each of the two areas is provided with aerodynamics. A recording / reproducing apparatus in which an auxiliary stabilizing member is disposed so as to generate an acting force so as to generate an acting force opposite to the main stabilizing member on the surface of the recording disk on which the main stabilizing member is located. There,
A tilt adjusting means for tilting the working surface of the aerodynamic force in each auxiliary stabilizing member at the same tilt angle in the disk radial direction;
A recording / reproducing apparatus comprising: position control means for setting the positions of the auxiliary stabilizing members so that the recording disk surface is pushed in with the same pushing amount.

A main stabilizing member that rotates a recording disk having flexibility and uses the Bernoulli effect to suppress surface blurring of the recording disk at least in the vicinity of the recording / reproducing position; and a working surface of the main Bernoulli effect of the recording disk; Comprises recording / reproducing means for recording and / or reproducing on the opposite side,
The surface of the recording disk is divided into two areas by a straight line A that is close to the flow line scanned by the recording / reproducing means and passes near the center of the recording disk, and each of the two areas is provided with aerodynamics. A recording / reproducing apparatus in which an auxiliary stabilizing member is disposed so as to generate an acting force so as to generate an acting force opposite to the main stabilizing member on the surface of the recording disk on which the main stabilizing member is located. There,
A tilt adjusting means for tilting the acting surface of the aerodynamic force in each auxiliary stabilizing member at the same tilt angle in the disk circumferential direction;
A recording / reproducing apparatus comprising: position control means for setting the positions of the auxiliary stabilizing members so that the recording disk surface is pushed in with the same pushing amount.

3. The recording / reproducing apparatus according to claim 1, wherein a rotation center when the auxiliary stabilizing member is tilted is set in the vicinity of an action point on an action surface of the auxiliary stabilizing member.

Storage means for storing in advance information on an appropriate inclination angle set in the auxiliary stabilizing member for each disk specification of the recording disk, and the inclination adjustment means can adjust the inclination according to the disk specification. The recording / reproducing apparatus according to claim 1 or 2.

The disc specification range that can be used in the device is limited, and the inclination of the auxiliary stabilizing member is fixed based on the center value of the appropriate inclination angle of the auxiliary stabilizing member set in the disc specification range. The recording / reproducing apparatus according to claim 1 or 2, characterized in that:

A main stabilizing member that rotates a recording disk having flexibility and uses the Bernoulli effect to suppress surface blurring of the recording disk at least in the vicinity of the recording / reproducing position; and a working surface of the main Bernoulli effect of the recording disk; Comprises recording / reproducing means for recording and / or reproducing on the opposite side,
The surface of the recording disk is divided into two areas by a straight line A that is close to the flow line scanned by the recording / reproducing means and passes near the center of the recording disk, and each of the two areas is provided with aerodynamics. A recording / reproducing apparatus provided with an auxiliary stabilizing member so as to generate an acting force to generate an acting force opposite to the main stabilizing member on the surface of the recording disk on which the main stabilizing member is located. A stabilization adjustment method used,
Both the aerodynamic force acting surfaces of the auxiliary stabilizing members are inclined at the same tilt angle in the disk radial direction, and both the auxiliary stabilizing members are pushed into the recording disk surface with the same pushing amount. Thus, the method of adjusting the stabilization of the recording / reproducing apparatus, wherein the acting force facing the main stabilizing member is optimized.

A main stabilizing member that rotates a recording disk having flexibility and uses the Bernoulli effect to suppress surface blurring of the recording disk at least in the vicinity of the recording / reproducing position; and a working surface of the main Bernoulli effect of the recording disk; Comprises recording / reproducing means for recording and / or reproducing on the opposite side,
The surface of the recording disk is divided into two areas by a straight line A that is close to the flow line scanned by the recording / reproducing means and passes near the center of the recording disk, and each of the two areas is provided with aerodynamics. A recording / reproducing apparatus provided with an auxiliary stabilizing member so as to generate an acting force to generate an acting force opposite to the main stabilizing member on the surface of the recording disk on which the main stabilizing member is located. A stabilization adjustment method used,
Both the aerodynamic force acting surfaces of the auxiliary stabilizing members are inclined at the same tilt angle in the disk circumferential direction, and both the auxiliary stabilizing members are A method for adjusting the stabilization of a recording / reproducing apparatus, wherein the acting force facing the main stabilizing member is optimized by pushing.

The information on an appropriate inclination angle of the auxiliary stabilizing member is stored in advance for each arbitrary disk specification of the recording disk, and the inclination of the auxiliary stabilizing member is adjusted according to the disk specification. 8. A method for adjusting the stabilization of a recording / reproducing apparatus according to 6 or 7.

Limiting the disk specification range used in the apparatus, and setting the inclination of the auxiliary stabilizing member fixed to the center value of the appropriate inclination angle of the auxiliary stabilizing member determined by the disk specification range. 8. A method for stabilizing and adjusting a recording / reproducing apparatus according to claim 6 or 7.

8. The tilt point of the auxiliary stabilizing member is set to set the point of action of the aerodynamic force of the auxiliary stabilizing member at a substantially rotational center of the auxiliary stabilizing member. Method for stabilizing the recording / reproducing apparatus.