JP4039303B2

JP4039303B2 - Objective lens drive device, optical pickup device, and disk drive device

Info

Publication number: JP4039303B2
Application number: JP2003113234A
Authority: JP
Inventors: 隆浩宮木
Original assignee: Sony Corp
Current assignee: Sony Corp
Priority date: 2003-04-17
Filing date: 2003-04-17
Publication date: 2008-01-30
Anticipated expiration: 2023-04-17
Also published as: JP2004319027A

Description

【０００１】
【発明の属する技術分野】
本発明は、光源からの光を集光してディスク状記録媒体に光スポットを照射するための対物レンズが取り付けられ、トラッキング方向とフォーカス方向に駆動されるレンズホルダ部を有する対物レンズ駆動装置、この対物レンズ駆動装置を備えた光ピックアップ装置およびディスクドライブ装置に関する。詳しくは、レンズホルダ部をトラッキング方向およびフォーカス方向に移動自在に支持した可動ブロックをハの字型の脚部を有する台形バネ部材で支持し、可動ブロックを駆動する駆動装置を設けて、台形バネ部材の変形でディスク面の傾き等に合わせてレンズホルダ部を傾斜できるようにしたものである。
【０００２】
【従来の技術】
ＤＶＤ（digital versatile disk）等の光ディスクに対して信号の再生あるいは記録を行う光ピックアップ装置は、光スポットを光ディスクのトラック上に合焦点するため、対物レンズを光ディスクの面に対して昇降させるフォーカス駆動機構が備えられる。また、光スポットを光ディスクのトラックに追従させるため、対物レンズを光ディスクの径方向（トラックの法線方向）に移動させるトラッキング駆動機構が備えられる。
【０００３】
近年、フォーカスとトラッキングに加え、対物レンズを傾斜させる機構を備えた３軸駆動デバイスや３軸アクチュエータ等と称される光ピックアップ装置も存在する。３軸駆動の光ピックアップ装置としては、対物レンズを保持するレンズホルダを軸により支持し、レンズホルダをこの軸を支点に回転させて対物レンズの角度を調整できるようにしたものがある（例えば、特許文献１参照。）。
【０００４】
【特許文献１】
特開平９−４４８７９号公報
【０００５】
【発明が解決しようとする課題】
しかしながら、軸支によりレンズホルダを回転させる従来の光ピックアップ装置では、ネジ等でレンズホルダの姿勢を規制する方式でなく、コイル等の駆動力を用いてレンズホルダを回転させようとすると、軸と軸受けのしゅう動摩擦によるヒステリシスで、駆動力にレンズホルダが追従せず、姿勢の再現性が悪いという問題がある。
【０００６】
また、レンズホルダにコイル等を追加する必要があり、設計を大幅に変更しなければならないとともに、コイルへの給電のための配線の増加や、レンズホルダの重量増や形状の制約等に伴い、トラッキングやフォーカス時の駆動感度の低下や共振特性の劣化を招くという問題がある。
【０００７】
本発明は、このような課題を解決するためになされたもので、トラッキングやフォーカス時の性能を劣化させることなく、簡単な構成でレンズホルダを回転駆動できるようした対物レンズ駆動装置、この対物レンズ駆動装置を備えた光ピックアップ装置およびディスクドライブ装置を提供することを目的とする。
【０００８】
【課題を解決するための手段】
上述した課題を解決するため、本発明に係る対物レンズ駆動装置は、対物レンズが取り付けられ、ディスク状記録媒体のトラッキング方向とフォーカス方向に駆動されるレンズホルダ部を有する対物レンズ駆動装置において、レンズホルダ部をトラッキング方向およびフォーカス方向に移動自在に支持する可動ブロックと、帯状の板バネ材を折り曲げて形成される２本のハの字型の脚部、これら２本の脚部の上端の間をつなぐ連結部、及び各脚部の下端側を折り曲げて形成される取付部を有し、連結部が可動ブロックに固定され、取付部がベース部に固定される台形バネ材と、台形バネ部材の一方の脚部を角度が浅くなる方向に弾性変形させると共に、他方の脚部を角度が深くなる方向に弾性変形させて可動ブロックを傾斜させる駆動力を可動ブロックに与えるコイルとマグネットを有し、この可動ブロックに支持されたレンズホルダ部を傾斜させる駆動装置とを備えたものである。
【０００９】
本発明に係る対物レンズ駆動装置では、可動ブロックに対して駆動装置で駆動力を与えると、台形バネ部材の一方の脚部は角度が浅くなる方向に弾性変形し、他方の脚部は角度が深くなる方向に弾性変形する。これにより、可動ブロックは、ハの字型の脚部の延長線上の交点を軸とした回転動作により傾斜する。可動ブロックはレンズホルダ部を支持しており、可動ブロックを回転させることでレンズホルダ部も回転動作を行い、対物レンズを傾斜させることができる。
【００１０】
したがって、ディスク状記録媒体の反り等に応じて、対物レンズを傾けることができる。また、台形バネ部材で支持した可動ブロックを駆動するので、レンズホルダ部の構成を変更することなく、対物レンズをディスク状記録媒体の反り等に応じて傾ける構成を付加することができる。
【００１１】
本発明に係る光ピックアップ装置は、上述した対物レンズ駆動装置を組み込んだものである。すなわち、ディスク状記録媒体に光スポットを照射するための対物レンズが取り付けられ、トラッキング方向とフォーカス方向に駆動されるレンズホルダ部を有する対物レンズ駆動装置を備えた光ピックアップ装置において、レンズホルダ部をトラッキング方向およびフォーカス方向に移動自在に支持する可動ブロックと、帯状の板バネ材を折り曲げて形成される２本のハの字型の脚部、これら２本の脚部の上端の間をつなぐ連結部、及び各脚部の下端側を折り曲げて形成される取付部を有し、連結部が可動ブロックに固定され、取付部がベース部に固定される台形バネ材と、台形バネ部材の一方の脚部を角度が浅くなる方向に弾性変形させると共に、他方の脚部を角度が深くなる方向に弾性変形させて可動ブロックを傾斜させる駆動力を可動ブロックに与えるコイルとマグネットを有し、この可動ブロックに支持されたレンズホルダ部を傾斜させる駆動装置とを備えたものである。
【００１２】
また、本発明に係るディスクドライブ装置は、上述した対物レンズ駆動装置を組み込んだ光ピックアップ装置を備えたものである。すなわち、ディスク状記録媒体に光スポットを照射するための対物レンズが取り付けられ、トラッキング方向とフォーカス方向に駆動されるレンズホルダ部を有する光ピックアップ装置を備えたディスクドライブ装置において、レンズホルダ部をトラッキング方向およびフォーカス方向に移動自在に支持する可動ブロックと、帯状の板バネ材を折り曲げて形成される２本のハの字型の脚部、これら２本の脚部の上端の間をつなぐ連結部、及び各脚部の下端側を折り曲げて形成される取付部を有し、連結部が可動ブロックに固定され、取付部がベース部に固定される台形バネ材と、台形バネ部材の一方の脚部を角度が浅くなる方向に弾性変形させると共に、他方の脚部を角度が深くなる方向に弾性変形させて可動ブロックを傾斜させる駆動力を可動ブロックに与えるコイルとマグネットを有し、この可動ブロックに支持されたレンズホルダ部を傾斜させる駆動装置とを備えたものである。
【００１３】
本発明に係る光ピックアップ装置では、レンズホルダ部の構成を変更することなく、対物レンズをディスク状記録媒体の反り等に応じて傾ける構成を付加することができる。よって、トラッキングとフォーカスに加え、ディスク面の傾きに応じて対物レンズを傾斜させる３軸のアクチュエータを備えた光ピックアップ装置を安価に提供できる。
【００１４】
そして、本発明に係るディスクドライブ装置では、安価な光ピックアップ装置を用いて、ディスク状記録媒体に対して信号を確実に記録できるとともに、ディスク状記録媒体の信号を確実に再生することができる。
【００１５】
【発明の実施の形態】
以下、図面を参照して本発明の対物レンズ駆動装置、光ピックアップ装置およびディスクドライブ装置の実施の形態について説明する。図１は対物レンズ駆動装置を備えた第１の実施の形態の光ピックアップ装置の構成例を示す要部斜視図、図２は第１の実施の形態の光ピックアップ装置の構成例を示す分解斜視図である。
【００１６】
第１の実施の形態の光ピックアップ装置１は、トラッキング方向およびフォーカス方向に駆動されるレンズホルダ部２を支持した可動ブロック３を台形バネ部材４で支持し、可動ブロック３の移動方向をこの台形バネ部材４の形状で規制する。そして、可動ブロック３を駆動する駆動装置５を設けて、ディスク状記録媒体の一例としての光ディスクの傾きに応じてレンズホルダ部２を傾斜できるようにした対物レンズ駆動装置を備えたものである。
【００１７】
レンズホルダ部２は、４本のサスペンションワイヤ６ａ〜６ｄにより可動ブロック３に支持される。このレンズホルダ部２は、対物レンズ７と、この対物レンズ７の取付部およびサスペンションワイヤ６ａ〜６ｄが取り付けられるワイヤ支持部８を備えたホルダ９と、ホルダ９の外周に図示しない光ディスクの面に対して水平に巻かれたフォーカスコイル１０と、光ディスクのトラックの接線方向に沿ってホルダ９の前後に設けられた一対のトラッキングコイル１１等を備える。
【００１８】
４本のサスペンションワイヤ６ａ〜６ｄは、導電性および弾性を有する材質で構成される。これら４本のサスペンションワイヤ６ａ〜６ｄに対応して、ホルダ９には、両側部に２箇所ずつ、計４箇所にワイヤ支持部８が設けられる。そして、各サスペンションワイヤ６ａ〜６ｄは、それぞれ一方の端部側が、対応するワイヤ支持部８に接着等により固定されている。
【００１９】
また、ホルダ９の側部には、フォーカスコイル１０へ給電する端子１２とトラッキングコイル１１に給電する端子１３が設けられる。ワイヤ支持部８に固定されたサスペンションワイヤ６ａとサスペンションワイヤ６ｂの一方の端部は、端子１２まで延在しており、サスペンションワイヤ６ａ，６ｂと端子１２は半田付けされる。また、ワイヤ支持部８に固定されたサスペンションワイヤ６ｃとサスペンションワイヤ６ｄの一方の端部は、端子１３まで延在しており、サスペンションワイヤ６ｃ，６ｄと端子１３は半田付けされる。ここで、各図において、サスペンションワイヤ６ｄに対応するワイヤ支持部８および端子１３は図示されない。
【００２０】
可動ブロック３は、サスペンションワイヤ６ａ〜６ｄに対応して両側部側に２箇所ずつ、計４箇所にワイヤ支持部１４が設けられ、各サスペンションワイヤ６ａ〜６ｄのそれぞれ他方の端部側が、対応するワイヤ支持部１４に接着等により固定されている。
【００２１】
ここで、フォーカス方向に並ぶサスペンションワイヤ６ａとサスペンションワイヤ６ｂ、およびサスペンションワイヤ６ｃとサスペンションワイヤ６ｄは、互いが平行となるように張られる。これに対して、トラッキング方向に並ぶサスペンションワイヤ６ａとサスペンションワイヤ６ｃ、およびサスペンションワイヤ６ｂとサスペンションワイヤ６ｄは、レンズホルダ部２側の間隔が狭く、可動ブロック３側の間隔が広いハの字型に張られる。
【００２２】
可動ブロック３のレンズホルダ部２を支持する側と反対の背面には基板１５が取り付けられる。この基板１５上の図示しないパターンと各サスペンションワイヤ６ａ〜６ｄが半田付けにより接続される。これにより、基板１５からサスペンションワイヤ６ａ，６ｂによってフォーカスコイル１０へ給電が行われる。また基板１５からサスペンションワイヤ６ｃ，６ｄによってトラッキングコイル１１へ給電が行われる。
【００２３】
可動ブロック３を支持する台形バネ部材４は、帯状の板バネ材を折り曲げて形成したもので、２本の脚部４１と、これら２本の脚部４１の上端の間をつなぐ連結部４２と、各脚部４１の下端側を折り曲げて形成した取付部４３とから構成される。
【００２４】
また、可動ブロック３を駆動する駆動装置５は、可動ブロック３の下面に取り付けられる二極着磁マグネット５１と、この二極着磁マグネット５１に対向して固定ベース部１６に取り付けられるボイスコイル５２とから構成される。
【００２５】
二極着磁マグネット５１は棒状で、中央には貫通穴５１ａが設けられる。また、台形バネ部材４の連結部４２の中央に貫通穴４２ａが設けられる。そして、可動ブロック３の下面に設けたボス３ａに、台形バネ部材４の貫通穴４２ａを嵌めるとともに、二極着磁マグネット５１の貫通穴５１ａを嵌めて、台形バネ部材４および二極着磁マグネット５１が接着により可動ブロック３に固定される。
【００２６】
このとき、二極着磁マグネット５１は、光ディスクのトラックの法線方向に沿ってＮ極とＳ極が配置されるように固定される。また、台形バネ部材４は、各脚部４１と連結部４２との折り曲げ部分、および各脚部４１と取付部４３との折り曲げ部分が、光ディスクのトラックの接線方向に沿った向きとなるように固定される。さらに、台形バネ部材４は可動ブロック３に対してガタが生じないように固定される。
【００２７】
また、台形バネ部材４の取付部４３にはそれぞれ貫通穴４３ａが設けられ、固定ベース部１６には、貫通穴４３ａの位置に対応してネジ穴１６ａが設けられる。そして、取付部４３の貫通穴４３ａにネジ１７を通して、このネジ１７を固定ベース部１６のネジ穴１６ａに締め付けることで、台形バネ部材４は固定ベース部１６に固定される。
【００２８】
これにより、可動ブロック３は、台形バネ部材４の２本の脚部４１により固定ベース部１６に支持される。これら脚部４１は、可動ブロック３側の間隔が固定ベース部１６側の間隔より狭いハの字型となっている。そして、各脚部４１を上方に延長した仮想線の交点と同じ高さに対物レンズ７の主点の高さが略一致するように、台形バネ部材４の形状が設定される。
【００２９】
これら２本の脚部４１の間で二極着磁マグネット５１と対向する位置の固定ベース部１６上に、ボイスコイル５２が固定される。ボイスコイル５２に給電すると、ボイスコイル５２に流れる電流と、二極着磁マグネット５１の磁界により、ボイスコイル５２に対して二極着磁マグネット５１を動かす力、すなわち、可動ブロック３を駆動する力が発生する。可動ブロック３は台形バネ部材４で支持されているので、駆動力を受けたときの可動ブロック３の姿勢は、台形バネ部材４の形状によって規制される。
【００３０】
ここで、台形バネ部材４は、ねじれに対しては剛性を持つように所定の幅を有する。そして、台形バネ部材４は連結部４２が可動ブロック３に固定され、取付部４３が固定ベース部１６に固定されることで、駆動力を受けたときに各脚部４１が弓なりに弾性変形することができる。また、脚部４１と連結部４２の折り曲げ部分および脚部４１と取付部４３の折り曲げ部分も弾性変形することができる。
【００３１】
ヨークベース部１８は、光ディスクのトラックの接線方向に沿って一対のヨーク１８ａが設けられ、各ヨーク１８ａに一対のマグネット１９が互いに対向して取り付けられる。この対向するマグネット１９の間に、各マグネット１９とトラッキングコイル１１が対向する向きでレンズホルダ部２が配置される。このヨークベース部１８には、図示しないレーザ光が通る光路となる開口部が設けられる。
【００３２】
そして、ヨークベース部１８と固定ベース部１６は、図示しないマウント部材に取り付けられる。また、このマウント部材には、半導体レーザなどの発光素子、フォトダイオード等の受光素子（光検出器）、ビームスプリッタ等を備えて光ピックアップ装置１が構成される。また、光ピックアップ装置１は、光ディスクを回転駆動する機構、および光ピックアップ装置１を駆動するスライド送り機構等を備えたディスクドライブ装置に組み込まれる。
【００３３】
図３は本実施の形態の光ピックアップ装置の動作例を示す正面図である。図３（ａ）はボイスコイル５２に給電していない状態を示す。この中立状態では、図１等に示す対物レンズ７が水平となるように、台形バネ部材４の形状等が設定される。
【００３４】
ボイスコイル５２に通電すると、二極着磁マグネット５１の磁界中のコイルに電流が流れることで、可動ブロック３を二極着磁マグネット５１の延在方向に沿って略水平方向に駆動する力が発生する。可動ブロック３は台形バネ部材４で支持されているので、駆動力を受けたときの可動ブロック３の姿勢は、台形バネ部材４の形状によって規制される。
【００３５】
すなわち、可動ブロック３を略水平方向に駆動する力が加わると、図３（ｂ）に示すように、台形バネ部材４の一方の脚部４１は角度が浅くなる矢印ａ方向に弾性変形し、他方の脚部４１は角度が深くなる矢印ｂ方向に弾性変形する。これにより、可動ブロック３は傾斜する。このとき、可動ブロック３は、図３（ａ）に示す中立状態の両脚部４１の延長線上の交点Ｏを軸とした回転動作をする。
【００３６】
可動ブロック３は４本のサスペンションワイヤ６ａ〜６ｄによりレンズホルダ部２を支持しているので、可動ブロック３が傾斜することで、レンズホルダ部２が傾斜する、これにより、所定の制御信号をボイスコイル５２に印加することで、レンズホルダ部２の対物レンズ７を、光ディスクの反り等に対応させて傾斜させることができる。傾斜の向きは、ボイスコイル５２に給電する電流の向きで切り替えられる。また、傾斜の角度は電圧値により所定の角度に調整できる。
【００３７】
そして、上述したように、台形バネ部材４の各脚部４１を上方に延長した仮想線の交点と同じ高さに対物レンズ７の主点の高さを略一致させてあるので、レンズホルダ部２は、対物レンズ７の主点を通る軸を中心とした回転動作を行う。これにより、対物レンズ７が水平な状態と傾斜した状態とで、光軸はほぼ一致している。
【００３８】
以上のように、台形バネ部材４を用いて可動ブロック３を支持し、この台形バネ部材４の変形で可動ブロック３を回転動作させることで、レンズホルダを軸支して回転動作させる場合と比較して、しゅう動摩擦によるヒステリシスの影響等を無くすことができる。しかしながら、台形バネ部材４を用いた構成では、可動ブロック３は一点を中心した回転動作を厳密には行ってはいない。このため、可動ブロック３を傾斜させてレンズホルダ部２を回転させると、対物レンズ７はフォーカス方向およびトラッキング方向にも微小量移動する。このため、必要に応じてフォーカス補正やトラッキング補正を行う。また、可動ブロック３（レンズホルダ部２）の傾斜による対物レンズ７の光軸に対する微小移動量を予め測定し、可動ブロック３の傾斜量に応じてフォーカス補正およびトラッキング補正を行っても良い。
【００３９】
図４は本実施の形態の光ピックアップ装置の制御系の構成例を示すブロック図である。図１等に示すボイスコイル５２に印加する制御信号を得るため、例えば、光ディスク２０の傾きを検出する検出装置としての傾き検出センサ２１を備える。そして、傾き検出センサ２１の出力に応じて、コイル駆動回路２２はボイスコイル５２に制御信号を印加し、レンズホルダ部２を光ディスク２０の反り等によるディスク面の傾きに合わせて回転させる。なお、この動作は、光ディスク２０がセットされたときに行うものとし、再生中等は、補正によるレンズホルダ部２の傾きを維持する。
【００４０】
また、光ディスクの傾きは、図示しない光検出器の出力にノイズとなって現れる。このため、傾き検出センサを用いず、光検出器の出力のノイズが少なくなる方向にレンズホルダ部２を傾斜させるように駆動装置５を制御するような制御機能を持たせてもよい。
【００４１】
以上のように、可動ブロック３を駆動する駆動装置５を設けてレンズホルダ部２を傾斜させる構成とすれば、光ディスクの傾斜を検出する手段を設けることで、個々の光ディスクの反り等に対応した量だけ対物レンズ７を回転させて、対物レンズ７の光軸が光ディスクの面に対して垂直となるように補正できる。これにより、光スポットの形状を常に適正なものとできる。また、人手によりレンズホルダ部２の傾きを調整する作業も不要となる。
【００４２】
次に、レンズホルダ部２のフォーカス制御およびトラッキング制御について説明する。フォーカスコイル１０に再生信号から生成したフォーカス制御信号が印加されると、このコイルに流れる電流と、ヨーク１８ａと一対のマグネット１９とによって形成された磁界による力で、レンズホルダ部２を電流の向きに応じて上昇あるいは下降させる方向の力が生じる。レンズホルダ部２は、４本のサスペンションワイヤ６ａ〜６ｄの一端側に支持されているので、レンズホルダ部２は、昇降する方向の力を受けると、図示しない光ディスクに対して平行な姿勢を保ったまま上下に昇降する。これにより、対物レンズ７が光軸に沿った方向にフォーカス制御され、対物レンズ７からの光スポットが光ディスクのトラック上に合焦点される。
【００４３】
また、トラッキングコイル１１に再生信号から生成したトラッキング制御信号が印加されると、このコイルに流れる電流と、ヨーク１８ａと一対のマグネット１９とによって形成された磁界による力で、レンズホルダ部２を電流の向きに応じて図示しない光ディスクの内周方向、あるいは光ディスクの外周方向へ移動させる力が生じる。レンズホルダ部２は、４本のサスペンションワイヤ６ａ〜６ｄの一端側に支持されているので、レンズホルダ部２は、光ディスクのトラックに対して左右へ移動する方向の力を受けると、光ディスクのトラックの法線方向とほぼ平行にスライドする。これにより対物レンズ７が光ディスクの径方向にトラッキング制御され、対物レンズ７からの光スポットが所望のトラックをトレースすることができる。
【００４４】
なお、このフォーカスおよびトラッキング制御による反力がサスペンションワイヤ６ａ〜６ｄを介して可動ブロック３に伝わるが、台形バネ部材４は、レンズホルダ部２を移動させる力では変形しない。
【００４５】
図５は第２の実施の形態の光ピックアップ装置の構成例を示す要部斜視図、図６は第２の実施の形態の光ピックアップ装置の構成例を示す分解斜視図である。この第２の実施の形態の光ピックアップ装置６１は、台形バネ部材６２を４枚の板バネ材から構成し、フォーカスコイル１０およびトラッキングコイル１１への給電をこの台形バネ部材６２を用いて行えるようにしたものである。なお、台形バネ部材６２以外の構成は、図１等で説明した光ピックアップ装置１と同様であるので、各部の詳細な説明は省略する。
【００４６】
台形バネ部材６２は第１の板バネ材６２ａ、第２の板バネ材６２ｂ、第３の板バネ材６２ｃおよび第４の板バネ材６２ｄから構成される。４枚の板バネ材のうち、第１の板バネ材６２ａおよび第２の板バネ材６２ｂでハの字の一方の脚部４１を構成し、第３の板バネ材６２ｃおよび第４の板バネ材６２ｄで他方の脚部４１を構成する。
【００４７】
また、第１の板バネ材６２ａの可動ブロック３への取付部には、サスペンションワイヤ６ａの他方の端部と接続する導体部６３ａを備える。第２の板バネ材６２ｂの可動ブロック３への取付部には、サスペンションワイヤ６ｂの他方の端部と接続する導体部６３ｂを備える。第３の板バネ材６２ｃの可動ブロック３への取付部には、サスペンションワイヤ６ｃの他方の端部と接続する導体部６３ｃを備える。第４の板バネ材６２ｄの可動ブロック３への取付部には、サスペンションワイヤ６ｄの他方の端部と接続する導体部６３ｄを備える。
【００４８】
さらに、第１の板バネ材６２ａの固定ベース部１６への取付部には接続端子６４ａを備える。第２の板バネ材６２ｂの固定ベース部１６への取付部には接続端子６４ｂを備える。第３の板バネ材６２ｃの固定ベース部１６への取付部には接続端子６４ｃを備える。第４の板バネ材６２ｄの固定ベース部１６への取付部には接続端子６４ｄを備える。
【００４９】
第１の板バネ材６２ａ、第２の板バネ材６２ｂ、第３の板バネ材６２ｃおよび第４の板バネ材６２ｄは導電性を有する材質で構成され、かつ、互いが短絡しない形状となっている。そして、サスペンションワイヤ６ａの他方の端部は導体部６３ａに半田付けにより接続され、サスペンションワイヤ６ｂの他方の端部は導体部６３ｂに半田付けにより接続され、サスペンションワイヤ６ｃの他方の端部は導体部６３ｃに半田付けにより接続され、サスペンションワイヤ６ｄの他方の端部は導体部６３ｄに半田付けにより接続される。
【００５０】
上述した構成の第２の実施の形態の光ピックアップ装置６１では、ボイスコイル５２に通電することで、可動ブロック３を介してレンズホルダ部２を傾斜させる動作は図３で説明した光ピックアップ装置１と同様である。
【００５１】
この第２の実施の形態の光ピックアップ装置６１では、図示しない駆動回路から接続端子６４ａと接続端子６４ｂにフォーカス制御信号を印加すると、第１の板バネ材６２ａがサスペンションワイヤ６ａと電気的に導通し、第２の板バネ材６２ｂがサスペンションワイヤ６ｂと電気的に導通しているので、フォーカスコイル１０へ給電が行われる。
【００５２】
また、図示しない駆動回路から接続端子６４ｃと接続端子６４ｄにトラッキング制御信号を印加すると、第３の板バネ材６２ｃがサスペンションワイヤ６ｃと電気的に導通し、第４の板バネ材６２ｄがサスペンションワイヤ６ｄと電気的に導通しているので、トラッキングコイル１１へ給電が行われる。
【００５３】
以上により、可動ブロック３へのケーブル類による配線を行わずに、フォーカスコイル１０およびトラッキングコイル１１へ給電を行うことができる。なお、図示しないが、ボイスコイル５２を可動ブロック３側に設け、二極着磁マグネット５１を固定ベース部１６側に設ける構成としても、可動ブロック３を傾斜させることができる。この場合、台形バネ部材を６枚の板バネ材で構成し、２枚の板バネ材でフォーカスコイル１０への給電を行い、他の２枚の板バネ材でトラッキングコイル１１への給電を行い、残りの２枚の板バネ材でボイスコイル５２への給電を行う構成とすることもできる。
【００５４】
さらに、光ピックアップ装置の他の実施の形態について説明する。すなわち、図７は第３の実施の形態の光ピックアップ装置の要部斜視図である。第１の実施の形態の光ピックアップ装置１では、レンズホルダ部２は光ディスクのトラックの接線方向に沿った軸を支点に回転する構成であるが、第３の実施の形態の光ピックアップ装置７１では、レンズホルダ部２を光ディスクのトラックの法線方向に沿った軸を支点にも回転できる構成としたものである。なお、レンズホルダ部２を光ディスクのトラックの法線方向に沿った軸を支点に回転させる駆動機構以外の構成は、図１等で説明した光ピックアップ装置１と同様であるので、各部の詳細な説明は省略する。
【００５５】
第１の実施の形態の光ピックアップ装置１の固定ベース部１６に相当する部材として、Ｌ字型のベース部７２を備える。このベース部７２で可動ブロック３を台形バネ部材４により支持している。このベース部７２を、台形バネ部材４と直交する向きの第２の台形バネ部材７３で固定ベース部７４に支持し、さらに、二極着磁マグネット７５とボイスコイル７６とからなる第２の駆動装置７７を設ける。
【００５６】
ここで、第２の台形バネ部材７３もハの字型の脚部７３ａでベース部７２を支持し、各脚部７３ａの延長線上の交点と略同じ高さに、対物レンズ７の主点が一致するように、第２の台形バネ部材７３の形状が設定される。また、第２の台形バネ部材７３は、各折り曲げ部分が光ディスクのトラックの法線方向に沿った向きとなるように固定される。
【００５７】
二極着磁マグネット７５はベース部７２の下面に設け、ボイスコイル７６は、この二極着磁マグネット７５に対向して固定ベース部７４に設ける。また、二極着磁マグネット７５は、光ディスクのトラックの接線方向に沿ってＮ極とＳ極が配置されるように固定される。
【００５８】
以上の構成により、ボイスコイル７６に給電すると、二極着磁マグネット７６の磁界中のコイルの電流が流れることで、ここではベース部７２を駆動する力が発生し、第２の台形バネ部材７３の一方の脚部７３ａは角度が浅くなる方向に弾性変形し、他方の脚部７３ａは角度が深くなる方向に弾性変形する。これにより、ベース部７２に台形バネ部材４を介して支持されている可動ブロック３は傾斜する。
【００５９】
可動ブロック３は４本のサスペンションワイヤ６ａ〜６ｄによりレンズホルダ部２を支持しているので、可動ブロック３が傾斜することで、レンズホルダ部２が傾斜する、これにより、所定の制御信号をボイスコイル７６に印加することで、レンズホルダ部２の対物レンズ７を、光ディスクのトラックの法線方向に沿った軸を支点に傾斜させることができる。このとき、レンズホルダ部２は、図７に示す中立状態における両脚部７３ａの延長線上の交点を軸とした回転動作をする。
【００６０】
【発明の効果】
以上説明したように、本発明は、対物レンズが取り付けられ、ディスク状記録媒体のトラッキング方向とフォーカス方向に駆動されるレンズホルダ部を有する対物レンズ駆動装置において、レンズホルダ部をトラッキング方向およびフォーカス方向に移動自在に支持する可動ブロックと、可動ブロックをハの字型の脚部によりベース部に支持する台形バネ部材と、台形バネ部材の脚部を弾性変形させて可動ブロックを傾斜させる駆動力を可動ブロックに与え、この可動ブロックに支持されたレンズホルダ部を傾斜させる駆動装置とを備えたものである。
【００６１】
したがって、ディスク状記録媒体の反り等に応じて、対物レンズを傾けることができる。また、台形バネ部材で支持した可動ブロックを駆動するので、レンズホルダ部の構成を変更することなく、対物レンズをディスク状記録媒体の反り等に応じて傾ける構成を付加することができる。
【００６２】
本発明に係る光ピックアップ装置は、上述した対物レンズ駆動装置を組み込むことで、トラッキングとフォーカスに加え、ディスク面の傾きに応じて対物レンズを傾斜させる３軸のアクチュエータを備えた光ピックアップ装置を、トラッキングやフォーカス駆動の性能を落とすことなく、安価に提供できる。
【００６３】
そして、本発明に係るディスクドライブ装置は、トラッキングやフォーカス駆動の性能を落とすことなく、対物レンズをディスク状記録媒体の反り等に応じて傾ける構成が付加された光ピックアップ装置を備えることで、ディスク状記録媒体に対して信号を確実に記録できるとともに、ディスク状記録媒体の信号を確実に再生することができる。
【図面の簡単な説明】
【図１】第１の実施の形態の光ピックアップ装置の構成例を示す要部斜視図である。
【図２】第１の実施の形態の光ピックアップ装置の構成例を示す分解斜視図である。
【図３】本実施の形態の光ピックアップ装置の動作例を示す正面図である。
【図４】本実施の形態の光ピックアップ装置の制御系の構成例を示すブロック図である。
【図５】第２の実施の形態の光ピックアップ装置の構成例を示す要部斜視図である。
【図６】第２の実施の形態の光ピックアップ装置の構成例を示す分解斜視図である。
【図７】第３の実施の形態の光ピックアップ装置の構成例を示す要部斜視図である。
【符号の説明】
１・・・光ピックアップ装置、２・・・レンズホルダ部、３・・・可動ブロック、４・・・台形バネ部材、５・・・駆動装置、６ａ〜６ｄ・・・サスペンションワイヤ、７・・・対物レンズ、１０・・・フォーカスコイル、１１・・・トラッキングコイル、１２・・・端子、１３・・・端子、１５・・・基板、１６・・・固定ベース部、１８・・・ヨークベース部、１８ａ・・・ヨーク、１９・・・マグネット、２０・・・光ディスク、２１・・・傾き検出センサ、２２・・・コイル駆動回路、４１・・・脚部、５１・・・二極着磁マグネット、５２・・・ボイスコイル、６１・・・光ピックアップ装置、６２・・・台形バネ部材、６２ａ・・・第１の板バネ材、６２ｂ・・・第２の板バネ材、６２ｃ・・・第３の板バネ材、６２ｄ・・・第４の板バネ材、６３ａ，６３ｂ，６３ｃ，６３ｄ・・・導体部、６４ａ，６４ｂ，６４ｃ，６４ｄ・・・接続端子、７１・・・光ピックアップ装置、７２・・・ベース部、７３・・・第２の台形バネ部材、７３ａ・・・脚部、７４・・・固定ベース部、７５・・・二極着磁マグネット、７６・・・ボイスコイル、７７・・・第２の駆動装置[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an objective lens driving apparatus having a lens holder portion that is attached with an objective lens for condensing light from a light source and irradiating a light spot on a disk-shaped recording medium and is driven in a tracking direction and a focus direction, The present invention relates to an optical pickup device and a disk drive device provided with the objective lens driving device. More specifically, a trapezoidal spring is provided by supporting a movable block that supports the lens holder portion so as to be movable in the tracking direction and the focus direction with a trapezoidal spring member having a C-shaped leg portion, and providing a driving device for driving the movable block. The lens holder can be tilted in accordance with the tilt of the disk surface or the like by deformation of the member.
[0002]
[Prior art]
An optical pickup device that reproduces or records a signal on an optical disk such as a DVD (digital versatile disk) is a focus drive that raises and lowers the objective lens with respect to the surface of the optical disk in order to focus the light spot on the track of the optical disk. A mechanism is provided. Also, a tracking drive mechanism is provided that moves the objective lens in the radial direction of the optical disk (in the normal direction of the track) in order to cause the light spot to follow the track of the optical disk.
[0003]
In recent years, in addition to focusing and tracking, there are also optical pickup devices called triaxial drive devices and triaxial actuators that include a mechanism for tilting an objective lens. As a three-axis drive optical pickup device, there is an optical pickup device in which a lens holder that holds an objective lens is supported by a shaft, and the angle of the objective lens can be adjusted by rotating the lens holder around the shaft (for example, (See Patent Document 1).
[0004]
[Patent Document 1]
JP 9-44879 A
[0005]
[Problems to be solved by the invention]
However, in the conventional optical pickup device in which the lens holder is rotated by the shaft support, when the lens holder is rotated by using a driving force of a coil or the like instead of a method of restricting the attitude of the lens holder by a screw or the like, the shaft and There is a problem that the reproducibility of the posture is poor because the lens holder does not follow the driving force due to the hysteresis due to the sliding friction of the bearing.
[0006]
In addition, it is necessary to add a coil etc. to the lens holder, the design has to be changed significantly, along with an increase in the wiring for power supply to the coil, an increase in the weight of the lens holder, restrictions on the shape, etc. There is a problem that drive sensitivity is lowered during tracking and focusing, and resonance characteristics are deteriorated.
[0007]
The present invention has been made to solve such problems, and an objective lens driving device capable of rotating the lens holder with a simple configuration without degrading the performance during tracking and focusing, and the objective lens An object of the present invention is to provide an optical pickup device and a disk drive device provided with a drive device.
[0008]
[Means for Solving the Problems]
In order to solve the above-described problems, an objective lens driving device according to the present invention is an objective lens driving device having a lens holder portion to which an objective lens is attached and driven in a tracking direction and a focusing direction of a disk-shaped recording medium. A movable block that supports the holder portion movably in the tracking direction and the focus direction; It is formed by bending two band-shaped leg portions formed by bending a belt-shaped leaf spring material, a connecting portion connecting between the upper ends of these two leg portions, and bending the lower end side of each leg portion. Has a mounting part, the connecting part is fixed to the movable block, and the mounting part is fixed to the base part Of trapezoidal spring material and trapezoidal spring member One leg is elastically deformed in a direction where the angle becomes shallower, and the other leg is made in a direction where the angle becomes deeper. Applying a driving force to the movable block to incline the movable block by elastic deformation Coil and magnet And a driving device for inclining the lens holder portion supported by the movable block.
[0009]
In the objective lens driving device according to the present invention, when a driving force is applied to the movable block by the driving device, one leg of the trapezoidal spring member is elastically deformed in a direction in which the angle becomes shallow, and the other leg has an angle. Elastically deforms in a deeper direction. As a result, the movable block is tilted by the rotation operation about the intersection point on the extension line of the C-shaped leg portion. The movable block supports the lens holder portion. By rotating the movable block, the lens holder portion also rotates, and the objective lens can be tilted.
[0010]
Therefore, the objective lens can be tilted according to the warp of the disc-shaped recording medium. Further, since the movable block supported by the trapezoidal spring member is driven, it is possible to add a configuration in which the objective lens is tilted according to the warp of the disk-shaped recording medium without changing the configuration of the lens holder portion.
[0011]
An optical pickup device according to the present invention incorporates the above-described objective lens driving device. That is, in an optical pickup device including an objective lens driving device having an objective lens for attaching a light spot to a disk-shaped recording medium and having a lens holder portion driven in a tracking direction and a focusing direction, the lens holder portion is A movable block that is movably supported in the tracking direction and the focus direction; It is formed by bending two band-shaped leg portions formed by bending a belt-shaped leaf spring material, a connecting portion connecting between the upper ends of these two leg portions, and bending the lower end side of each leg portion. Has a mounting part, the connecting part is fixed to the movable block, and the mounting part is fixed to the base part Of trapezoidal spring material and trapezoidal spring member One leg is elastically deformed in a direction where the angle becomes shallower, and the other leg is made in a direction where the angle becomes deeper. Applying a driving force to the movable block to incline the movable block by elastic deformation Coil and magnet And a driving device for inclining the lens holder portion supported by the movable block.
[0012]
The disk drive device according to the present invention includes an optical pickup device incorporating the above-described objective lens driving device. That is, in a disk drive device equipped with an optical pickup device having an objective lens for irradiating a light spot on a disk-shaped recording medium and having a lens holder portion driven in a tracking direction and a focus direction, the lens holder portion is tracked. A movable block that is movably supported in a direction and a focus direction; It is formed by bending two band-shaped leg portions formed by bending a belt-shaped leaf spring material, a connecting portion connecting between the upper ends of these two leg portions, and bending the lower end side of each leg portion. Has a mounting part, the connecting part is fixed to the movable block, and the mounting part is fixed to the base part Of trapezoidal spring material and trapezoidal spring member One leg is elastically deformed in a direction where the angle becomes shallower, and the other leg is made in a direction where the angle becomes deeper. Applying a driving force to the movable block to incline the movable block by elastic deformation Coil and magnet And a driving device for inclining the lens holder portion supported by the movable block.
[0013]
In the optical pickup device according to the present invention, it is possible to add a configuration in which the objective lens is tilted in accordance with the warp of the disk-shaped recording medium without changing the configuration of the lens holder portion. Therefore, in addition to tracking and focusing, an optical pickup device including a triaxial actuator that tilts the objective lens according to the tilt of the disk surface can be provided at low cost.
[0014]
In the disk drive device according to the present invention, it is possible to reliably record a signal on the disk-shaped recording medium using an inexpensive optical pickup device and to reliably reproduce the signal of the disk-shaped recording medium.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of an objective lens driving device, an optical pickup device, and a disk drive device of the present invention will be described below with reference to the drawings. FIG. 1 is a main part perspective view showing a configuration example of an optical pickup device according to a first embodiment having an objective lens driving device, and FIG. 2 is an exploded perspective view showing a configuration example of the optical pickup device according to the first embodiment. FIG.
[0016]
The optical pickup device 1 according to the first embodiment supports a movable block 3 that supports a lens holder portion 2 driven in a tracking direction and a focus direction by a trapezoidal spring member 4, and the moving direction of the movable block 3 is the trapezoid. The shape is regulated by the shape of the spring member 4. Then, a driving device 5 for driving the movable block 3 is provided, and an objective lens driving device that can tilt the lens holder portion 2 in accordance with the tilt of an optical disk as an example of a disk-shaped recording medium is provided.
[0017]
The lens holder 2 is supported on the movable block 3 by four suspension wires 6a to 6d. The lens holder portion 2 includes an objective lens 7, a holder 9 having a wire support portion 8 to which the attachment portion of the objective lens 7 and the suspension wires 6 a to 6 d are attached, and an optical disc (not shown) on the outer periphery of the holder 9. A focus coil 10 wound horizontally is provided, and a pair of tracking coils 11 provided before and after the holder 9 along the tangential direction of the track of the optical disk.
[0018]
The four suspension wires 6a to 6d are made of a material having conductivity and elasticity. Corresponding to these four suspension wires 6a to 6d, the holder 9 is provided with wire support portions 8 at a total of four locations, two on each side. And each suspension wire 6a-6d is being fixed to the corresponding wire support part 8 by adhesion | attachment etc., respectively.
[0019]
Further, a terminal 12 for supplying power to the focus coil 10 and a terminal 13 for supplying power to the tracking coil 11 are provided on the side of the holder 9. One end of the suspension wire 6a and the suspension wire 6b fixed to the wire support portion 8 extends to the terminal 12, and the suspension wires 6a and 6b and the terminal 12 are soldered. One end of the suspension wire 6c and the suspension wire 6d fixed to the wire support portion 8 extends to the terminal 13, and the suspension wires 6c and 6d and the terminal 13 are soldered. Here, in each figure, the wire support part 8 and the terminal 13 corresponding to the suspension wire 6d are not shown.
[0020]
The movable block 3 is provided with wire support portions 14 at two locations on both sides corresponding to the suspension wires 6a to 6d, for a total of four locations, and the other end side of each suspension wire 6a to 6d corresponds. It is fixed to the wire support 14 by bonding or the like.
[0021]
Here, the suspension wire 6a and the suspension wire 6b arranged in the focus direction, and the suspension wire 6c and the suspension wire 6d are stretched so as to be parallel to each other. On the other hand, the suspension wire 6a and the suspension wire 6c arranged in the tracking direction, and the suspension wire 6b and the suspension wire 6d are formed in a square shape with a narrow interval on the lens holder 2 side and a wide interval on the movable block 3 side. It is stretched.
[0022]
A substrate 15 is attached to the back surface of the movable block 3 opposite to the side that supports the lens holder portion 2. A pattern (not shown) on the substrate 15 and the suspension wires 6a to 6d are connected by soldering. As a result, power is supplied from the substrate 15 to the focus coil 10 through the suspension wires 6a and 6b. Further, power is supplied from the substrate 15 to the tracking coil 11 by the suspension wires 6c and 6d.
[0023]
The trapezoidal spring member 4 that supports the movable block 3 is formed by bending a belt-shaped leaf spring material, and includes two leg portions 41 and a connecting portion 42 that connects between the upper ends of the two leg portions 41. The mounting portion 43 is formed by bending the lower end side of each leg portion 41.
[0024]
The driving device 5 for driving the movable block 3 includes a two-pole magnetized magnet 51 attached to the lower surface of the movable block 3 and a voice coil 52 attached to the fixed base portion 16 so as to face the two-pole magnetized magnet 51. It consists of.
[0025]
The dipole magnetized magnet 51 is rod-shaped and has a through hole 51a at the center. Further, a through hole 42 a is provided in the center of the connecting portion 42 of the trapezoidal spring member 4. Then, the through hole 42a of the trapezoidal spring member 4 is fitted into the boss 3a provided on the lower surface of the movable block 3, and the through hole 51a of the two-pole magnetized magnet 51 is fitted into the trapezoidal spring member 4 and the two-pole magnetized magnet. 51 is fixed to the movable block 3 by adhesion.
[0026]
At this time, the dipole magnetized magnet 51 is fixed so that the N pole and the S pole are arranged along the normal direction of the track of the optical disc. Further, the trapezoidal spring member 4 is such that the bent portions of the leg portions 41 and the connecting portions 42 and the bent portions of the leg portions 41 and the attachment portions 43 are oriented along the tangential direction of the track of the optical disc. Fixed. Furthermore, the trapezoidal spring member 4 is fixed to the movable block 3 so that no play occurs.
[0027]
Further, each of the attachment portions 43 of the trapezoidal spring member 4 is provided with a through hole 43a, and the fixed base portion 16 is provided with a screw hole 16a corresponding to the position of the through hole 43a. The trapezoidal spring member 4 is fixed to the fixed base portion 16 by passing the screw 17 through the through hole 43 a of the mounting portion 43 and tightening the screw 17 into the screw hole 16 a of the fixed base portion 16.
[0028]
Accordingly, the movable block 3 is supported on the fixed base portion 16 by the two leg portions 41 of the trapezoidal spring member 4. These leg portions 41 are formed in a square shape in which the interval on the movable block 3 side is narrower than the interval on the fixed base portion 16 side. Then, the shape of the trapezoidal spring member 4 is set so that the height of the principal point of the objective lens 7 substantially coincides with the intersection of the virtual lines extending upward from the leg portions 41.
[0029]
The voice coil 52 is fixed on the fixed base portion 16 at a position facing the two-pole magnetized magnet 51 between the two legs 41. When power is supplied to the voice coil 52, the force that moves the dipole magnetized magnet 51 relative to the voice coil 52 by the current flowing through the voice coil 52 and the magnetic field of the dipole magnetized magnet 51, that is, the force that drives the movable block 3. Will occur. Since the movable block 3 is supported by the trapezoidal spring member 4, the posture of the movable block 3 when receiving the driving force is regulated by the shape of the trapezoidal spring member 4.
[0030]
Here, the trapezoidal spring member 4 has a predetermined width so as to have rigidity against torsion. The trapezoidal spring member 4 has the connecting portion 42 fixed to the movable block 3 and the mounting portion 43 fixed to the fixed base portion 16 so that each leg portion 41 is elastically deformed like a bow when receiving a driving force. be able to. Further, the bent portions of the leg portion 41 and the connecting portion 42 and the bent portions of the leg portion 41 and the attachment portion 43 can be elastically deformed.
[0031]
The yoke base portion 18 is provided with a pair of yokes 18a along the tangential direction of the track of the optical disc, and a pair of magnets 19 are attached to each yoke 18a so as to face each other. Between the opposing magnets 19, the lens holder portion 2 is disposed in a direction in which each magnet 19 and the tracking coil 11 face each other. The yoke base portion 18 is provided with an opening that serves as an optical path through which laser light (not shown) passes.
[0032]
The yoke base portion 18 and the fixed base portion 16 are attached to a mount member (not shown). The mount member includes a light emitting element such as a semiconductor laser, a light receiving element (photodetector) such as a photodiode, a beam splitter, and the like, and the optical pickup device 1 is configured. The optical pickup device 1 is incorporated in a disk drive device that includes a mechanism for rotationally driving an optical disk and a slide feed mechanism for driving the optical pickup apparatus 1.
[0033]
FIG. 3 is a front view showing an operation example of the optical pickup device of the present embodiment. FIG. 3A shows a state where power is not supplied to the voice coil 52. In this neutral state, the shape and the like of the trapezoidal spring member 4 are set so that the objective lens 7 shown in FIG.
[0034]
When the voice coil 52 is energized, a current flows through the coil in the magnetic field of the two-pole magnetized magnet 51, so that the force for driving the movable block 3 in the substantially horizontal direction along the extending direction of the two-pole magnetized magnet 51 is generated. appear. Since the movable block 3 is supported by the trapezoidal spring member 4, the posture of the movable block 3 when receiving the driving force is regulated by the shape of the trapezoidal spring member 4.
[0035]
That is, when a force for driving the movable block 3 in a substantially horizontal direction is applied, as shown in FIG. 3B, one leg portion 41 of the trapezoidal spring member 4 is elastically deformed in the direction of the arrow a where the angle becomes shallower. The other leg 41 is elastically deformed in the direction of the arrow b where the angle increases. Thereby, the movable block 3 inclines. At this time, the movable block 3 rotates about the intersection O on the extension line of the leg portions 41 in the neutral state shown in FIG.
[0036]
Since the movable block 3 supports the lens holder portion 2 by the four suspension wires 6a to 6d, the lens holder portion 2 is tilted when the movable block 3 is tilted. By applying to the coil 52, the objective lens 7 of the lens holder portion 2 can be tilted corresponding to the warp of the optical disk. The direction of the inclination is switched depending on the direction of the current supplied to the voice coil 52. Further, the inclination angle can be adjusted to a predetermined angle by the voltage value.
[0037]
And as mentioned above, since the height of the principal point of the objective lens 7 is made to be substantially the same as the intersection of the imaginary lines obtained by extending the leg portions 41 of the trapezoidal spring member 4 upward, the lens holder portion 2 performs a rotation operation around an axis passing through the principal point of the objective lens 7. As a result, the optical axes of the objective lens 7 are substantially the same between the horizontal state and the inclined state.
[0038]
As described above, the trapezoidal spring member 4 is used to support the movable block 3, and the movable block 3 is rotated by the deformation of the trapezoidal spring member 4, so that the lens holder is pivotally supported and rotated. Thus, it is possible to eliminate the influence of hysteresis caused by sliding friction. However, in the configuration using the trapezoidal spring member 4, the movable block 3 does not strictly perform the rotation operation around one point. For this reason, when the movable block 3 is tilted and the lens holder portion 2 is rotated, the objective lens 7 is also moved by a minute amount in the focus direction and the tracking direction. For this reason, focus correction and tracking correction are performed as necessary. Further, a minute movement amount with respect to the optical axis of the objective lens 7 due to the inclination of the movable block 3 (lens holder portion 2) may be measured in advance, and focus correction and tracking correction may be performed according to the inclination amount of the movable block 3.
[0039]
FIG. 4 is a block diagram illustrating a configuration example of a control system of the optical pickup device according to the present embodiment. In order to obtain a control signal to be applied to the voice coil 52 shown in FIG. 1 and the like, for example, an inclination detection sensor 21 as a detection device for detecting the inclination of the optical disc 20 is provided. Then, according to the output of the tilt detection sensor 21, the coil drive circuit 22 applies a control signal to the voice coil 52 to rotate the lens holder unit 2 in accordance with the tilt of the disk surface due to the warp of the optical disk 20 or the like. This operation is performed when the optical disk 20 is set, and the tilt of the lens holder unit 2 is maintained by the correction during reproduction or the like.
[0040]
Further, the inclination of the optical disk appears as noise in the output of a photodetector (not shown). For this reason, you may provide a control function which controls the drive device 5 so that the lens holder part 2 may be inclined in the direction where the noise of the output of the photodetector is reduced without using the inclination detection sensor.
[0041]
As described above, when the driving device 5 for driving the movable block 3 is provided and the lens holder portion 2 is inclined, by providing a means for detecting the inclination of the optical disk, it is possible to cope with the warp of each optical disk. The objective lens 7 can be rotated by an amount so that the optical axis of the objective lens 7 can be corrected to be perpendicular to the surface of the optical disk. Thereby, the shape of a light spot can always be made appropriate. Further, it is not necessary to manually adjust the inclination of the lens holder portion 2.
[0042]
Next, focus control and tracking control of the lens holder unit 2 will be described. When a focus control signal generated from a reproduction signal is applied to the focus coil 10, the current flowing through the coil and the force generated by the magnetic field formed by the yoke 18 a and the pair of magnets 19 causes the lens holder 2 to move in the direction of the current. In response to this, a force in the direction of rising or lowering is generated. Since the lens holder portion 2 is supported on one end side of the four suspension wires 6a to 6d, the lens holder portion 2 maintains a parallel posture with respect to an optical disc (not shown) when receiving the force in the up and down direction. Move up and down while standing. Thereby, the focus of the objective lens 7 is controlled in the direction along the optical axis, and the light spot from the objective lens 7 is focused on the track of the optical disk.
[0043]
Further, when a tracking control signal generated from the reproduction signal is applied to the tracking coil 11, the lens holder unit 2 is subjected to current by a force generated by the current flowing through the coil and the magnetic field formed by the yoke 18 a and the pair of magnets 19. Depending on the orientation of the optical disc, a force for moving in the inner peripheral direction of the optical disc (not shown) or the outer peripheral direction of the optical disc is generated. Since the lens holder portion 2 is supported on one end side of the four suspension wires 6a to 6d, when the lens holder portion 2 receives a force in the direction of moving left and right with respect to the track of the optical disc, the track of the optical disc Slide almost parallel to the normal direction. Thereby, the objective lens 7 is tracking-controlled in the radial direction of the optical disk, and the light spot from the objective lens 7 can trace a desired track.
[0044]
Although the reaction force due to the focus and tracking control is transmitted to the movable block 3 via the suspension wires 6a to 6d, the trapezoidal spring member 4 is not deformed by the force for moving the lens holder portion 2.
[0045]
FIG. 5 is a perspective view of a main part showing a configuration example of the optical pickup device of the second embodiment, and FIG. 6 is an exploded perspective view showing a configuration example of the optical pickup device of the second embodiment. In the optical pickup device 61 of the second embodiment, the trapezoidal spring member 62 is composed of four leaf spring materials, and power can be supplied to the focus coil 10 and the tracking coil 11 using the trapezoidal spring member 62. It is a thing. Since the configuration other than the trapezoidal spring member 62 is the same as that of the optical pickup device 1 described in FIG. 1 and the like, detailed description of each part is omitted.
[0046]
The trapezoidal spring member 62 includes a first leaf spring material 62a, a second leaf spring material 62b, a third leaf spring material 62c, and a fourth leaf spring material 62d. Of the four leaf spring materials, the first leaf spring material 62a and the second leaf spring material 62b constitute one leg 41 of the letter C, and the third leaf spring material 62c and the fourth leaf spring material. The other leg portion 41 is constituted by the spring material 62d.
[0047]
Further, the attachment portion of the first leaf spring material 62a to the movable block 3 is provided with a conductor portion 63a connected to the other end portion of the suspension wire 6a. The attachment portion of the second leaf spring material 62b to the movable block 3 is provided with a conductor portion 63b connected to the other end portion of the suspension wire 6b. An attachment portion of the third leaf spring material 62c to the movable block 3 is provided with a conductor portion 63c connected to the other end portion of the suspension wire 6c. The attachment portion of the fourth leaf spring material 62d to the movable block 3 is provided with a conductor portion 63d connected to the other end portion of the suspension wire 6d.
[0048]
Furthermore, the connection part 64a is provided in the attachment part to the fixed base part 16 of the 1st leaf | plate spring material 62a. An attachment portion of the second leaf spring material 62b to the fixed base portion 16 includes a connection terminal 64b. An attachment portion of the third leaf spring material 62c to the fixed base portion 16 includes a connection terminal 64c. An attachment portion of the fourth leaf spring material 62d to the fixed base portion 16 includes a connection terminal 64d.
[0049]
The first leaf spring material 62a, the second leaf spring material 62b, the third leaf spring material 62c, and the fourth leaf spring material 62d are made of a conductive material and do not short-circuit each other. ing. The other end of the suspension wire 6a is connected to the conductor 63a by soldering, the other end of the suspension wire 6b is connected to the conductor 63b by soldering, and the other end of the suspension wire 6c is a conductor. The other end portion of the suspension wire 6d is connected to the conductor portion 63d by soldering.
[0050]
In the optical pickup device 61 of the second embodiment configured as described above, the operation of inclining the lens holder portion 2 via the movable block 3 by energizing the voice coil 52 is the optical pickup device 1 described in FIG. It is the same.
[0051]
In the optical pickup device 61 of the second embodiment, when a focus control signal is applied to the connection terminal 64a and the connection terminal 64b from a drive circuit (not shown), the first leaf spring material 62a is electrically connected to the suspension wire 6a. Since the second leaf spring material 62b is electrically connected to the suspension wire 6b, power is supplied to the focus coil 10.
[0052]
Further, when a tracking control signal is applied to the connection terminal 64c and the connection terminal 64d from a drive circuit (not shown), the third leaf spring material 62c is electrically connected to the suspension wire 6c, and the fourth leaf spring material 62d is connected to the suspension wire. Since it is electrically connected to 6d, power is supplied to the tracking coil 11.
[0053]
As described above, power can be supplied to the focus coil 10 and the tracking coil 11 without performing wiring to the movable block 3 using cables. Although not shown, the movable block 3 can be tilted even when the voice coil 52 is provided on the movable block 3 side and the two-pole magnetized magnet 51 is provided on the fixed base portion 16 side. In this case, the trapezoidal spring member is composed of six leaf spring materials, the two leaf spring materials supply power to the focus coil 10, and the other two leaf spring materials supply power to the tracking coil 11. The power supply to the voice coil 52 may be performed with the remaining two leaf spring materials.
[0054]
Furthermore, another embodiment of the optical pickup device will be described. That is, FIG. 7 is a perspective view of a main part of the optical pickup device according to the third embodiment. In the optical pickup device 1 of the first embodiment, the lens holder unit 2 is configured to rotate about an axis along the tangential direction of the track of the optical disk, but in the optical pickup device 71 of the third embodiment, The lens holder portion 2 is configured to be able to rotate about an axis along the normal direction of the track of the optical disk as a fulcrum. The configuration other than the drive mechanism that rotates the lens holder portion 2 about the axis along the normal direction of the track of the optical disc is the same as that of the optical pickup device 1 described with reference to FIG. Description is omitted.
[0055]
An L-shaped base portion 72 is provided as a member corresponding to the fixed base portion 16 of the optical pickup device 1 of the first embodiment. The movable block 3 is supported by the trapezoidal spring member 4 by the base portion 72. The base portion 72 is supported on the fixed base portion 74 by a second trapezoidal spring member 73 oriented in a direction orthogonal to the trapezoidal spring member 4, and further, a second drive comprising a two-pole magnetized magnet 75 and a voice coil 76. A device 77 is provided.
[0056]
Here, the second trapezoidal spring member 73 also supports the base portion 72 with a C-shaped leg portion 73a, and the principal point of the objective lens 7 is at substantially the same height as the intersection on the extension line of each leg portion 73a. The shape of the second trapezoidal spring member 73 is set so as to match. The second trapezoidal spring member 73 is fixed so that each bent portion is oriented along the normal direction of the track of the optical disk.
[0057]
The dipole magnetized magnet 75 is provided on the lower surface of the base portion 72, and the voice coil 76 is provided on the fixed base portion 74 so as to face the dipole magnetized magnet 75. The dipole magnetized magnet 75 is fixed so that the N pole and the S pole are arranged along the tangential direction of the track of the optical disc.
[0058]
With the above configuration, when power is supplied to the voice coil 76, a coil current in the magnetic field of the two-pole magnetized magnet 76 flows, so that a force for driving the base portion 72 is generated here, and the second trapezoidal spring member 73 is generated. One leg portion 73a is elastically deformed in a direction where the angle becomes shallow, and the other leg portion 73a is elastically deformed in a direction where the angle becomes deeper. Thereby, the movable block 3 supported by the base part 72 via the trapezoidal spring member 4 inclines.
[0059]
Since the movable block 3 supports the lens holder portion 2 by the four suspension wires 6a to 6d, the lens holder portion 2 is tilted when the movable block 3 is tilted. By applying to the coil 76, the objective lens 7 of the lens holder portion 2 can be tilted with the axis along the normal direction of the track of the optical disc as a fulcrum. At this time, the lens holder portion 2 rotates around the intersection point on the extension line of both the leg portions 73a in the neutral state shown in FIG.
[0060]
【The invention's effect】
As described above, according to the present invention, an objective lens is attached to an objective lens driving device having a lens holder portion that is driven in a tracking direction and a focusing direction of a disc-shaped recording medium. A movable block that is movably supported on the base, a trapezoidal spring member that supports the movable block on the base portion with a C-shaped leg, and a driving force that elastically deforms the leg of the trapezoidal spring member to tilt the movable block And a driving device for inclining a lens holder portion supported by the movable block and supported by the movable block.
[0061]
Therefore, the objective lens can be tilted according to the warp of the disc-shaped recording medium. Further, since the movable block supported by the trapezoidal spring member is driven, it is possible to add a configuration in which the objective lens is tilted according to the warp of the disk-shaped recording medium without changing the configuration of the lens holder portion.
[0062]
An optical pickup device according to the present invention includes an optical pickup device including a triaxial actuator that inclines the objective lens according to the inclination of the disk surface in addition to tracking and focusing by incorporating the above-described objective lens driving device. This can be provided at low cost without degrading the tracking and focus drive performance.
[0063]
The disk drive device according to the present invention includes the optical pickup device to which the configuration in which the objective lens is tilted according to the warp of the disk-shaped recording medium without degrading the performance of tracking and focus driving is provided. The signal can be reliably recorded on the recording medium, and the signal on the disk recording medium can be reliably reproduced.
[Brief description of the drawings]
FIG. 1 is a main part perspective view showing a configuration example of an optical pickup device according to a first embodiment;
FIG. 2 is an exploded perspective view illustrating a configuration example of the optical pickup device according to the first embodiment.
FIG. 3 is a front view showing an operation example of the optical pickup device of the present embodiment.
FIG. 4 is a block diagram illustrating a configuration example of a control system of the optical pickup device according to the present embodiment.
FIG. 5 is a main part perspective view showing a configuration example of an optical pickup device according to a second embodiment;
FIG. 6 is an exploded perspective view illustrating a configuration example of an optical pickup device according to a second embodiment.
FIG. 7 is a main part perspective view showing a configuration example of an optical pickup device according to a third embodiment;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Optical pick-up apparatus, 2 ... Lens holder part, 3 ... Movable block, 4 ... Trapezoid spring member, 5 ... Drive apparatus, 6a-6d ... Suspension wire, 7 ... Objective lens, 10 ... focus coil, 11 ... tracking coil, 12 ... terminal, 13 ... terminal, 15 ... substrate, 16 ... fixed base, 18 ... yoke base Part, 18a ... yoke, 19 ... magnet, 20 ... optical disk, 21 ... tilt detection sensor, 22 ... coil drive circuit, 41 ... leg part, 51 ... two poles Magnetic magnet 52 ... Voice coil 61 ... Optical pickup device 62 ... Trapezoidal spring member 62a ... First leaf spring material 62b ... Second leaf spring material 62c ..Third leaf spring material, 62d ... Plate spring material, 63a, 63b, 63c, 63d ... conductor portion, 64a, 64b, 64c, 64d ... connection terminal, 71 ... optical pickup device, 72 ... base portion, 73 ... Second trapezoidal spring member, 73a ... leg, 74 ... fixed base, 75 ... two-pole magnetized magnet, 76 ... voice coil, 77 ... second drive device

Claims

In an objective lens driving apparatus having a lens holder portion to which an objective lens is attached and driven in a tracking direction and a focusing direction of a disk-shaped recording medium,
A movable block that movably supports the lens holder portion in a tracking direction and a focusing direction;
It is formed by bending two strip-shaped leg portions formed by bending a strip-shaped leaf spring material, a connecting portion connecting between the upper ends of the two leg portions, and bending the lower end side of each leg portion. A trapezoidal spring material in which the connecting portion is fixed to the movable block, and the mounting portion is fixed to the base portion ;
One of the leg portions of the trapezoidal spring member is elastically deformed in a direction in which the angle becomes shallower, and a driving force for inclining the movable block by elastically deforming the other leg portion in a direction in which the angle becomes deeper. a coil and a magnet that Ru applied to the objective lens driving device is characterized in that a drive device for tilting the lens holder portion supported to the movable block.

2. The objective lens according to claim 1, wherein the trapezoidal spring member elastically deforms the leg portion in a direction in which the movable block is inclined with a shaft along a tangential direction of a track of the disk-shaped recording medium as a fulcrum. Drive device.

2. The drive device , wherein the magnet is attached to one of the movable block or the base portion, and the coil is attached to the other of the base portion or the movable block so as to face the magnet. The objective-lens drive device of description.

2. The objective lens driving device according to claim 1, wherein focus correction and tracking correction are performed in accordance with a minute movement amount of the objective lens due to an inclination of the movable block .

The trapezoidal spring member is composed of four leaf spring materials having conductivity,
Power is supplied to the tracking coil that drives the lens holder portion in the tracking direction with the two leaf spring materials constituting the trapezoidal spring member,
The objective lens driving device according to claim 1, wherein power is supplied to a focus coil that drives the lens holder portion in a focusing direction with the other two leaf spring materials.

The trapezoidal spring member is composed of six leaf spring materials having conductivity,
Power is supplied to the tracking coil that drives the lens holder portion in the tracking direction with the two leaf spring materials constituting the trapezoidal spring member,
Power is supplied to the focus coil that drives the lens holder in the focus direction with the other two leaf spring materials,
The objective lens driving device according to claim 1, wherein power is supplied to the driving device with the remaining two leaf spring materials.

A second trapezoidal spring member that supports the base portion with a C-shaped leg portion;
A driving force for inclining the base portion by elastically deforming the leg portion of the second trapezoidal spring member is applied to the base portion, and the lens holder portion supported by the base portion via the movable block is inclined. A second drive device
The leg part of the second trapezoidal spring member is elastically deformed in a direction in which the base part is inclined with an axis along a normal line direction of a track of the disc-shaped recording medium as a fulcrum. The objective-lens drive device of description.

In an optical pickup device provided with an objective lens driving device having a lens holder portion attached to an objective lens for irradiating a light spot on a disc-shaped recording medium and driven in a tracking direction and a focusing direction.
A movable block that movably supports the lens holder portion in a tracking direction and a focusing direction;
It is formed by bending two strip-shaped leg portions formed by bending a strip-shaped leaf spring material, a connecting portion connecting between the upper ends of the two leg portions, and bending the lower end side of each leg portion. A trapezoidal spring material in which the connecting portion is fixed to the movable block, and the mounting portion is fixed to the base portion ;
One of the leg portions of the trapezoidal spring member is elastically deformed in a direction in which the angle becomes shallower, and a driving force for inclining the movable block by elastically deforming the other leg portion in a direction in which the angle becomes deeper. a coil and a magnet that Ru applied to an optical pickup apparatus is characterized in that a drive device for tilting the lens holder portion supported to the movable block.

9. The optical pickup according to claim 8, wherein the trapezoidal spring member elastically deforms the leg portion in a direction in which the movable block is inclined with an axis along a tangential direction of a track of the disk-shaped recording medium as a fulcrum. apparatus.

9. The drive device , wherein the magnet is attached to one of the movable block or the base portion, and the coil is attached to the other of the base portion or the movable block so as to face the magnet. The optical pickup device described.

9. The optical pickup device according to claim 8, wherein focus correction and tracking correction are performed in accordance with a minute movement amount of the objective lens due to an inclination of the movable block .

The trapezoidal spring member is composed of four leaf spring materials having conductivity,
Power is supplied to the tracking coil that drives the lens holder portion in the tracking direction with the two leaf spring materials constituting the trapezoidal spring member,
The optical pickup device according to claim 8, wherein power is supplied to a focus coil that drives the lens holder portion in a focus direction with the other two leaf spring materials.

The trapezoidal spring member is composed of six leaf spring materials having conductivity,
Power is supplied to the tracking coil that drives the lens holder portion in the tracking direction with the two leaf spring materials constituting the trapezoidal spring member,
Power is supplied to the focus coil that drives the lens holder in the focus direction with the other two leaf spring materials,
The optical pickup device according to claim 8, wherein power is supplied to the driving device with the remaining two leaf spring materials.

A second trapezoidal spring member that supports the base portion with a C-shaped leg portion;
A driving force for inclining the base portion by elastically deforming the leg portion of the second trapezoidal spring member is applied to the base portion, and the lens holder portion supported by the base portion via the movable block is inclined. A second drive device
The leg part of the second trapezoidal spring member is elastically deformed in a direction in which the base part is inclined with an axis along a normal line direction of a track of the disc-shaped recording medium as a fulcrum. The optical pickup device described.

In a disk drive device equipped with an optical pickup device having a lens holder portion that is attached to an objective lens for irradiating a light spot on a disk-shaped recording medium and driven in a tracking direction and a focus direction,
A movable block that movably supports the lens holder portion in a tracking direction and a focusing direction;
It is formed by bending two strip-shaped leg portions formed by bending a strip-shaped leaf spring material, a connecting portion connecting between the upper ends of the two leg portions, and bending the lower end side of each leg portion. A trapezoidal spring material in which the connecting portion is fixed to the movable block, and the mounting portion is fixed to the base portion ;
One of the leg portions of the trapezoidal spring member is elastically deformed in a direction in which the angle becomes shallower, and a driving force for inclining the movable block by elastically deforming the other leg portion in a direction in which the angle becomes deeper. a coil and a magnet that Ru applied to the disk drive apparatus is characterized in that a drive device for tilting the lens holder portion supported to the movable block.

16. The disk drive according to claim 15, wherein the trapezoidal spring member elastically deforms the leg portion in a direction in which the movable block is inclined with an axis along a tangential direction of the track of the disk-shaped recording medium as a fulcrum. apparatus.

16. The drive device , wherein the magnet is attached to one of the movable block or the base portion, and the coil is attached to the other of the base portion or the movable block so as to face the magnet. The disk drive device described.

16. The disk drive device according to claim 15, wherein focus correction and tracking correction are performed according to a minute movement amount of the objective lens due to an inclination of the movable block .

The trapezoidal spring member is composed of four leaf spring materials having conductivity,
Power is supplied to the tracking coil that drives the lens holder portion in the tracking direction with the two leaf spring materials constituting the trapezoidal spring member,
The disk drive device according to claim 15, wherein power is supplied to a focus coil that drives the lens holder portion in a focus direction with the other two leaf spring materials.

The trapezoidal spring member is composed of six leaf spring materials having conductivity,
Power is supplied to the tracking coil that drives the lens holder portion in the tracking direction with the two leaf spring materials constituting the trapezoidal spring member,
Power is supplied to the focus coil that drives the lens holder in the focus direction with the other two leaf spring materials,
The disk drive device according to claim 15, wherein power is supplied to the drive device with the remaining two leaf spring materials.

A second trapezoidal spring member that supports the base portion with a C-shaped leg portion;
A driving force for inclining the base portion by elastically deforming the leg portion of the second trapezoidal spring member is applied to the base portion, and the lens holder portion supported by the base portion via the movable block is inclined. A second drive device
The leg part of the second trapezoidal spring member is elastically deformed in a direction in which the base part is inclined with an axis along a normal line direction of a track of the disc-shaped recording medium as a fulcrum. The disk drive device described.

A detection device for detecting the inclination of the surface of the disk-shaped recording medium;
16. The disk drive device according to claim 15, wherein the drive device tilts the movable block according to the tilt of the surface of the disk-shaped recording medium detected by the detection device.