JP4389420B2 - Recording / playback device - Google Patents

Recording / playback device Download PDF

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Publication number
JP4389420B2
JP4389420B2 JP2001257371A JP2001257371A JP4389420B2 JP 4389420 B2 JP4389420 B2 JP 4389420B2 JP 2001257371 A JP2001257371 A JP 2001257371A JP 2001257371 A JP2001257371 A JP 2001257371A JP 4389420 B2 JP4389420 B2 JP 4389420B2
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Japan
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objective lens
base
optical
actuator
recording
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JP2003067941A (en
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賢 小長谷
裕典 岡澤
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Panasonic Corp
Panasonic Holdings Corp
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Panasonic Corp
Matsushita Electric Industrial Co Ltd
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Description

【0001】
【産業上の利用分野】
本発明は、情報媒体の再生または記録を行う記録再生装置に関する。
【0002】
【従来の技術】
図5は、従来の光ディスク記録再生装置に適用する光ピックアップの要部分解斜視図、図6は光ピックアップの要部正面図である。101は対物レンズ、102は対物レンズ101を保持するレンズホルダー、103はレンズホルダー102を不図示の光ディスクをラジアル方向、タンジェンシャル方向、及び対物レンズ101の光軸中心方向に駆動する駆動手段、104は対物レンズ101、レンズホルダー102及び駆動手段103を含む可動部とアクチュエータベース105とを弾性支持する弾性支持部材(図では金属ワイヤ)、106は光学基台である。
【0003】
アクチュエータベース105は板バネ107の変形部と係合し、固定部材108により板バネ107を光学基台106に固定することでアクチュエータベース105は光学基台106に対し弾性押圧される。また、光学基台106は、主軸109及び副軸110と各々係合する主軸受111及び副軸受112を備え、主軸109及び副軸110を不図示の記録再生部に固定することで、光ピックアップは記録再生装置に装着される。
【0004】
光ディスクの情報層に情報信号を記録、または、光ディスクの情報層に予め記録された情報を再生(以下、録再と称す)するためには、光ディスクの所定の情報層に光ビームを集光するように、光源120から放射した光ビームの光軸中心と対物レンズの光軸中心とを一致させる光軸角度調整(以下、スキュー調整とも言う)を行うことが必須である。スキュー調整には、光ディスクのラジアル方向とタンジェンシャル方向とを調整すれば良く、光学基台106に備えた貫通孔113を介してアクチュエータベース105に備えたネジ孔114に係合し、主にラジアル方向の光軸を調整するスキューネジ115、及び、光学基台106に備えた貫通孔116を介してアクチュエータベース105に備えたネジ孔117に係合し、主にタンジェンシャル方向の光軸を調整するスキューネジ118によってスキュー調整を行う。
【0005】
スキュー調整後、図6に示したように、アクチュエータベース105と光学基台106とを複数箇所接着剤を塗布硬化した接着部119(図では4ヶ所)により、振動及び/または衝撃等の影響で光軸ずれを抑制する。
このように接着剤で接着した後、主軸109及び副軸110にそれぞれ主軸受111及び副軸受112に組み込み、主軸109及び副軸110に組み込んだ光ピックアップを記録再生部に装着した後、主軸109及び副軸110とディスクを載置保持するターンテーブルとの相対的な角度調整を補正する。
【0006】
従って、予め光ピックアップを組み込んだ主軸109及び副軸110を記録再生部に装着した後、スキューネジ115及び/または118でスキュー調整すると、対物レンズ101の光軸中心と光源120から出射する光ビームの光軸中心との光軸角度調整と、主軸109・副軸110・ターンテーブルとの間の相対的な角度調整とが一度にできるため、調整工程が簡略化できる。
【0007】
一方、光ディスクを用いる記録再生装置は、コンパクトディスクプレーヤに始まり、最近ではDVD記録再生装置と普及がめざましく、使用対象年齢も拡大してきている。このような記録再生装置では光ピックアップは光ディスクと対向配置するため、使用者が光ピックアップに直接触れることが可能であり、例えば、光ピックアップに触れることにより対物レンズ101を駆動する駆動手段103の駆動特性を損ねる、駆動手段103または不図示の記録再生部の回路等の電流が流れる部分に触れることで感電する可能性があり、図5に示したように、対物レンズ101がディスクのラジアル方向に移動する長さと、対物レンズから出射する光ビームを遮らない幅との開口部121を備えた蓋体122で、光ピックアップ、ディスク駆動モータ及び記録再生回路等の記録再生装置の構成要素の殆どを凹側内部に覆い、蓋体122の凸面にディスクを載置保持するターンテーブル123を備える安全な構成の記録再生装置も提案されだしている。
【0008】
この安全性を重視した蓋体122を有する記録再生装置で上述した調整工程を簡略化するため、主軸109及び副軸110と組み込んだ光ピックアップを蓋体122に内包した記録再生部に予め装着し、その後スキューネジ115及び118でスキュー調整することで、安全性と製造効率向上とを両立する構成が検討されている。
【0009】
【発明が解決しようとする課題】
しかしながら、図5に示した開口部121を備えた蓋体122に予め光ピックアップを組み込んだ主軸109及び副軸110を装着した記録再生装置では、ターンテーブル123に載置するディスクと主軸及び副軸との平行度は機械加工で調整は可能であるが、光源120から出射する光ビームの光軸中心と対物レンズ101の光軸中心とのスキュー調整は、微細な光ビームをディスクの情報層上に正確に照射する必要があるため、機械加工精度だけでは達成できない。そこで蓋体122の凹側内部に存在する不図示の記録再生部の裏側からスキューネジ115及び118を回動することでスキュー調整自体は可能であるが、スキュー調整の後光軸角度変化を抑制する接着部119を、図6に示したようにレンズホルダー102、駆動手段103等を含む可動部及び弾性支持部材104(以下、これらを総合してアクチュエータ手段と称す)から離隔した位置に複数箇所設けることは、アクチュエータベース105、光学基台106及びドライブ本体の立体構造上不可能である。
【0010】
接着部119を設けなければ、光学基台106に対するアクチュエータ手段の位置規制は、板バネ107の弾性押圧力、スキューネジ115とネジ孔114との締め付け力、及びスキューネジ118とネジ孔117との締め付け力の3者の力のみである。しかしながら、スキューネジ115及び118とネジ孔114及び117との締め付け力は、本来スキュー調整用に締め付ける力であるため極めて脆弱であり、僅かな衝撃でもスキュー調整を損ね、事実上光ピックアップとしての機能がないという課題が発生する。
【0011】
本発明は、上記従来の問題点に鑑み、振動、落下衝撃等に耐性を有し、しかも安全性を加味した記録再装置を提供することを目的とする。
【0012】
【課題を解決するための手段】
上記課題を解決するために本発明の記録再生装置は、情報媒体の中心孔に係合し前記情報媒体を回転するターンテーブルと、前記情報媒体のラジアル方向に対しそれぞれ平行に配置された主軸と副軸とが係合する光学基台にアクチュエータベースを介して押圧され、前記情報媒体の情報層に光ビームを集光する対物レンズ及び前記対物レンズを前記情報媒体のラジアル方向、タンジェンシャル方向及び前記対物レンズの光軸中心方向に駆動する駆動手段を備えるアクチュエータ手段と、前記対物レンズが前記ラジアル方向に前記情報層上を移動し、少なくとも前記光ビームが照射する範囲の開口を有する開口部と、凸面には前記ターンテーブルとを備え、凹側内部に前記開口部の前記タンジェンシャル方向の長さ以上の間隔で前記主軸及び前記副軸が固定された蓋体と、前記アクチュエータベースに備え、前記開口部に対向する位置であって、前記対物レンズの光軸中心と略直行し前記ラジアル方向に前記アクチュエータ手段よりも延在する延在部と、前記延在部と前記光学基台との境界部に接着部とを有する。
【0013】
また、上記記録再生装置における延在部が接着部を介して係合すると共にアクチュエータ手段側に突出する壁部を光学基台に備える。
【0014】
また、上記何れかの記録再生装置における延在部に、壁部が貫通する貫通部を備える。
【0015】
また、上記何れかの記録再生装置を製造する方法は、情報媒体の中心孔に係合し前記情報媒体を回転するターンテーブルと、前記情報媒体のラジアル方向に対しそれぞれ平行に配置された主軸と副軸とが係合する光学基台にアクチュエータベースを介して押圧され、前記情報媒体の情報層に光ビームを集光する対物レンズ及び前記対物レンズを前記情報媒体のラジアル方向、タンジェンシャル方向及び前記対物レンズの光軸中心方向に駆動する駆動手段を備えるアクチュエータ手段と、前記対物レンズが前記ラジアル方向に前記情報層上を移動し、少なくとも前記光ビームが透過する範囲の開口を有する開口部を備えた蓋体と、前記アクチュエータベースに備え、前記開口部に対向する位置であって、前記対物レンズの光軸中心と略直行し前記ラジアル方向に前記アクチュエータ手段よりも延在する延在部と、前記対物レンズの光軸中心を主に前記ラジアル方向に光軸角度調整するスキュー手段Aと、前記対物レンズの光軸中心を主に前記タンジェンシャル方向に光軸角度調整するスキュー手段Bとに係合し、前記光学基台に備えた貫通孔A及び貫通孔Bと、前記貫通孔A及び前記貫通孔Bに対応する位置で、前記アクチュエータベースに備えた前記スキュー手段A及び前記スキュー手段Bを係止する係止部A及び係止部Bとを備え、前記蓋体の凸面に前記ターンテーブルを配し、前記アクチュエータベースを介して前記アクチュエータ手段を前記光学基台に押圧係合し、前記主軸及び前記副軸を前記光学基台に係合し、前記蓋体の凹側内部に前記開口部の前記タンジェンシャル方向の長さ以上の間隔で前記主軸及び前記副軸を固定し、前記スキュー手段A及び前記スキュー手段Bで前記対物レンズの光軸中心を前記ラジアル方向及び前記タンジェンシャル方向に調整し、前記延在部と前記光学基台との境界部に、接着剤を前記開口部から滴下する。
【0016】
【実施の形態】
請求項1記載の本発明の記録再生装置は、アクチュエータ手段より延在する延在部をアクチュエータベースに備え、当該延在部と光学基台との境界部に接着部を備えた構成により、機械加工精度によりターンテーブルに載置する情報媒体と光学基台が係合する主軸及び副軸との平行度を保ち、光軸角度調整を施した光ピックアップを光学基台に対し接着することができ、その結果、振動や落下衝撃等に対する耐性を有し、しかも蓋体を備えることで安全性を加味した記録再生装置を提供できる。
【0017】
請求項2記載の本発明の記録再生装置は、延在部が接着部を介して係合する壁部を光学基台に備えた構成により、接着剤が光学基台の側面を伝わり流出し、当該壁面及び/または記録再生部で固着することで光ピックアップ及び/または記録再生部の動作信頼性が劣る可能性を抑制でき、延在部と光学基台との界面の接着剤の流出量を抑制することで接着剤の量を最小に制御できるとともに、接着部が延在部・光学基台・壁部に亘り存在することで接着面積を増加でき接着強度を向上できる。
【0018】
請求項3記載の本発明の記録再生装置は、延在部に壁部を貫通する貫通部を備えた構成により、接着部とアクチュエータ手段との間に壁部を備える構成が成し得、アクチュエータ手段と光学基台との境界に接着剤が流入することにより、アクチュエータ特性が損なわれることを抑制できるとともに、貫通部から突出した壁部・延在部・光学基台に亘り接着部が存在することで接着面積を増大でき接着強度を向上できる。
【0019】
請求項4記載の本発明の記録再生装置の製造方法は、スキュー手段A及びBでスキュー調整した後、延在部と光学基台との境界部に、開口部から接着剤を滴下する構成を備えているため、光学基台が係合する主軸及び副軸が開口部を介してターンテーブルに載置する情報媒体と平行に配置した状態で光ピックアップの光軸角度調整を行うことで、当該情報媒体の情報層に対し信号の授受が正確に行える状態にアクチュエータ手段を調整した後、当該アクチュエータ手段を光学基台にのみ接着固定することができ、光軸角度調整工程を一度に行うとともに、情報媒体に対しアクチュエータ手段の光軸角度を調整した状態を、振動や落下衝撃等によるズレから保護できる。
【0020】
【実施例】
本発明の記録再生装置の一実施例について図面を参照し詳細に説明する。図1は本発明の一実施例における記録再生装置の要部を示す分解斜視図、図2は同実施例の装置に組み込んだ光ピックアップの要部斜視図である。1は対物レンズ、2は対物レンズ1を保持するレンズホルダー、3はレンズホルダー2に固定され、対物レンズ1を不図示のディスクの半径方向(いわゆるラジアル方向)、情報媒体の接線方向(いわゆるタンジェンシャル方向)及び対物レンズ1の光軸中心方向(いわゆるフォーカシング方向)に駆動する駆動手段である。4は対物レンズ1、レンズホルダー2、及び駆動手段3を含むアクチュエータ手段である。なお、アクチュエータ手段4には、対物レンズ1の光軸中心方向の内情報媒体側の位置を規制するアクチュエータカバー5を備える。また、アクチュエータ手段4は、アクチュエータベース6と金属ワイヤー等の不図示の弾性体を介して係合する。
【0021】
アクチュエータベース6は、光学基台7に板バネ8の変形部及び固定部材9と係合することにより弾性係合する。また、光学基台7の貫通孔A10とアクチュエータ手段4の係止部A11(図1では隠れているため不図示、図2を参照)とに係合し、対物レンズ1の光軸中心を不図示の情報媒体のラジアル方向の角度を主に調整するスキュー手段A12、及び、光学基台7の貫通孔B13とアクチュエータ手段4の係止部B14とに係合し、対物レンズ1の光軸中心を情報媒体のタンジェンシャル方向の角度を主に調整するスキュー手段B15を介して、アクチュエータベース6と光学基台7とが係合している。
【0022】
光学基台7の主軸受16に主軸17が、副軸受18に副軸19がそれぞれ貫通することで、光学基台7がラジアル方向に移動でき、情報媒体に予め記録された情報を再生、または情報媒体に所定の情報信号を記録する。また、主軸受16及び副軸受18に貫通した主軸17及び副軸19は、蓋体20の凹側内部に装着する。また、蓋体20の凸面には不図示の情報媒体を載置保持するターンテーブル21を備える。なお、蓋体20の凹側内部には、図示は省略したが、ターンテーブル21に駆動力を伝達する駆動モータ、情報媒体に対し情報信号の授受を行う各種制御部等の記録再生部も装着している。
【0023】
次に、光源から放射された光ビームの光路の調整について説明する。光ピックアップの光源としては、公知のように半導体レーザ(以下、レーザと称す)22が適用される。レーザ22で放射された光ビームは、対物レンズ1を介して不図示の情報媒体の情報層を照射し、情報層で反射された反射光は対物レンズ1を通り不図示の光電変換素子に入射し、情報層の情報信号、フォーカシング制御、トラッキング制御等の元になる電気信号に変換される。
【0024】
従って、レーザ22から対物レンズ1・情報層・対物レンズ1・光電変換素子に至る光路を正確に調整することが、光ピックアップの生命線となる。特に、情報媒体の高密度記録に伴い、上記光路の調整(以下、スキュー調整と称す)は益々高精度が要請される。
【0025】
スキュー調整は、いわゆる情報層の面に対する光ビームの傾き調整のことであり、情報媒体のタンジェンシャル方向とラジアル方向の傾きを是正することでスキュー調整を行う。つまり、スキュー手段A12により情報層に対する主にラジアル方向の傾きを調整し、スキュー手段B15により情報層に対する主にタンジェンシャル方向の傾きを調整することでスキュー調整は終了する。すなわち、スキュー手段A12は光学基台7に備える貫通孔A10を介してアクチュエータベース6に備える係止部A11に係止し、スキュー手段B15は光学基台7に備える貫通孔B13を介してアクチュエータベース6に備える係止部B14に係止することで行う。なお、一般にスキュー手段A12及びB15はネジが適応され、スキューネジとも称され、係止部A11及びB14は当該スキューネジを締め付けるメスネジが適用されるため、本実施例でもこの場合を例に採った説明をしたが、貫通孔A10及びB13にネジ孔が切られ、係止部A11及びB14がスキューネジが当接係合する平板であっても良く、その他各種の方法が適用できる。
【0026】
本実施例におけるスキュー調整は、前述したように主軸受16及び副軸受18それぞれに係合した主軸17及び副軸19を蓋体20の凹部内に固定することにより、記録再生装置に予め光ピックアップを組み込んだ後に行うことになるが、スキュー調整自体はスキュー手段A12及びB15に記録再生装置の裏面(図1の下側)から例えばドライバーを係合させ回転することで容易に行える。
【0027】
このような本実施例におけるスキュー調整は、記録再生装置に組み込んだ状態でレーザ22から放射する光ビームの光軸の情報層に対する傾きを調整できるため、記録再生装置に光ピックアップを装着する前に例えばスキュー調整治具にて対物レンズ1の光軸中心と光学基台7との取付角度を決め、その後アクチュエータベース6と光学基台7とを接着固定していた従来技術と比較すると、実際の記録再生装置で生じる主軸17及び副軸19とターンテーブル21との相対的な角度誤差も含めて補正できるため、格段に精度の高いスキュー調整が可能である。また、例えばDVDディスク等の記録密度の高い情報媒体を用いる記録再生装置では、上述のスキュー治具を用いた調整の後、記録再生装置に組み込んだ状態でターンテーブル21に対する主軸17及び副軸19の角度調整を行うという2段構えのスキュー調整を行っていたが、本実施例のスキュー調整の採用でスキュー調整は1回で完結できるため、高精度かつ調整工数の削減効果がある。
【0028】
以上のようにしてスキュー調整を施した光ピックアップは、情報媒体の情報層に対し情報信号の授受を正確に行うことが可能であるが、実際的には、駆動モータ及び/またはアクチュエータの駆動や光学基台7を主軸17及び副軸19に沿って情報媒体のラジアル方向の往復移動等に起因する装置内振動、及び/または衝撃や落下等に起因する装置に外部から加えられるいわゆる外乱により、前述したように極めて簡単にスキュー調整に狂いが生じ、記録再生装置としての機能が完全に損なわれる。
【0029】
そこで、スキュー調整した後、アクチュエータベース6と光学基台7とを接着固定し、アクチュエータベース6の光学基台7に対するずれを防止することが要請される。接着固定場所は従来技術と同様に、対物レンズ1の動作に直接関わる例えばアクチュエータ手段4や板バネ8等の構成部品から離隔した位置に備えることが安全であるが、前述したように蓋体20の凹部内に組み込まれた光ピックアップでは、スキュー調整を実施した記録再生装置の裏面方向からはドライバー等の剛性物は挿入可能であるが、液状の接着剤を塗布することは不可能であり、蓋体20に備えた開口部23から視認できる範囲にしか設けることができない。
【0030】
そこで、本実施例では、開口部23から視認できる範囲(開口部23直下が好ましい)にあり、アクチュエータベース6にアクチュエータ手段4からラジアル方向に延在する延在部24及び25と、当該延在部24及び25に接する光学基台7との境界部に接着部26及び27を備える。このようにスキュー調整後アクチュエータベース6と光学基台7との境界部を接着することにより、内部振動及び/または外乱によりスキュー調整にずれが生じる課題を抑制することができ、上述のように調整工数を削減しかつ高精度に調整したスキューを維持できる。
【0031】
なお、接着部26及び27に供される接着剤としては、液体または流動体から固化する接着性を備える物質であれば溶剤蒸発型接着剤及び硬化型接着剤の如何は問わないが、経時変化、環境性、光ピックアップ等の構成部品への影響を鑑みると硬化型が好ましい。また、記録再生装置に組み込んだ後接着を行うため、硬化型接着剤の中でもエネルギー線照射硬化型、またはエネルギー線照射硬化型と加熱硬化型との併用が望ましい。また、接着剤の粘度を適正化することで、延在部24及び25と光学基台7とにのみ選択的に接着剤を備えることも可能であるし、延在部24及び25と光学基台7との係合面に接着剤を流入させることも可能である。係合面に流入させる場合の接着剤としては、エネルギー線照射硬化型と加熱硬化型との併用が望ましい。
【0032】
また、接着方法としては、例えば液状の接着剤をノズル等により接着部26及び27に所定量を滴下または注入(両者を総称して滴下と称する)し、しかる後例えば紫外線照射または加熱等を施すことにより接着剤を硬化することにより容易に達成できる。また、接着部26で接着する際に光ピックアップを主軸17及び副軸19に沿って接着部27側に移動し、開口部23から接着部26を視認しやすくした後滴下、接着部27の場合には逆に光ピックアップを主軸17及び副軸19に沿って接着部26側に移動し、開口部23から接着部27を視認しやすくした後滴下すると、接着工程を容易化できるため好ましい。なお、上記例では接着は2カ所備える例を示したが、接着部26または27の何れか一方でも本発明の効果は奏するが、上記例のように2カ所設ける方が信頼性が高く好ましい。
【0033】
接着固定に際して適用する接着剤が低粘度であると塗布しやすいが、接着剤の流動性が高いため接着したい位置から接着剤が流出し、流出した接着剤がアクチュエータ手段4、板バネ8等のアクチュエータ特性上重要な部材を不要に接着することにより光ピックアップの特性を損ねる危惧がある。そこで接着剤の流出を抑制する抑制部を接着箇所近傍に備えることで、光ピックアップの特性が維持保証できる。
【0034】
その一例を図3及び図4を参照して説明する。図3は本発明の他の実施例における記録再生装置の要部分解斜視図、図4は同実施例の装置に組み込んだ光ピックアップの要部斜視図である。但し、図1及び2と同様の機能を発揮する要素については同一符号を付与すると共に説明を割愛する。前述の実施例と異なる構成は、延在部24及び25と光学基台7との境界部近傍の光学基台7に壁部28及び29を備えた点である。壁部28及び29を備えたことで、接着剤が接着部26及び27から外側に流出し、例えば板バネ8に達することでアクチュエータベース6と光学基台7との付勢力に変動の発生、または光学基台7の側面を伝わり不図示の記録再生部等を汚染することにより動作不良の原因等を抑制しながら、延在部24及び25・アクチュエータベース6の光学基台7との境界側面(すなわち、延在部24及び25の壁部28及び29に対向する側面)・光学基台7・壁部28及び29とで接着することで接着面積が増大でき、その結果接着強度も向上できる効果があり、光ピックアップの経時安定性等の動作信頼性が向上できる。
【0035】
なお、図4に示した接着部26及び27は、上述したように、開口部23から視認できる範囲から接着剤を滴下することで極めて容易に形成できる。また、接着部26で接着する際に光ピックアップを主軸17及び副軸19に沿って接着部27側に移動し、開口部23から接着部26を視認しやすくした後滴下、接着部27の場合には逆に光ピックアップを主軸17及び副軸19に沿って接着部26側に移動し、開口部23から接着部27を視認しやすくした後滴下すると、接着工程を容易化できるため好ましい点は同様である。さらに、上記例では接着は2カ所備える例を示したが、接着部26または27の何れか一方でも本発明の効果は奏するが、上記例のように2カ所設ける方が信頼性が高く好ましい点も同様である。
【0036】
別の例を図5を参照して説明する。図5は本発明の別の実施例における記録再生装置に組み込んだ光ピックアップの要部斜視図である。図5においても、図1〜図4と同様の機能を発揮する要素については同一符号を付与すると共に説明は割愛する。図4と異なる構成は、延在部24及び25に備えた貫通部30及び31を光学基台7に備えた壁部32及び33が突き抜け、接着部26及び27は壁部32及び33に対しアクチュエータベース6の外側に設けた構成である。この構成を採用すると、接着剤が接着部26及び27からアクチュエータベース6側に流出し、例えば不図示の金属ワイヤ等の弾性体、レンズホルダー2等のアクチュエータ手段4等を汚染することにより光ピックアップのアクチュエータ特性不良の原因を抑制すると共に、図3及び4で説明した構成と同様に、延在部24及び25・アクチュエータベース6の光学基台7との境界側面(すなわち、延在部24及び25の壁部28及び29に対向する側面)・光学基台7・壁部32及び33十で接着することで増大でき、その結果接着強度も向上できる効果があり、光ピックアップの経時安定性等の動作信頼性が向上できる。なお、本例における接着部26及び27は共に壁部32及び33に対しアクチュエータベース6の外側に備えた場合を示したが、貫通部30及び31の場所によっては壁部32及び33とアクチュエータベース6との間に備えても良く、何れか一方をアクチュエータベース6と壁部32または33との間に備え他方は外側に備えても良く、あるいは壁部32及び33のアクチュエータベース6側とアクチュエータベース6の外側の両方に備えても良いこと勿論である。
【0037】
なお、図5に示した接着部26及び27は、上述したように、開口部23から視認できる範囲から接着剤を滴下することで極めて容易に形成できる。また、接着部26で接着する際に光ピックアップを主軸17及び副軸19に沿って接着部27側に移動し、開口部23から接着部26を視認しやすくした後滴下、接着部27の場合には逆に光ピックアップを主軸17及び副軸19に沿って接着部26側に移動し、開口部23から接着部27を視認しやすくした後滴下すると、接着工程を容易化できるため好ましい点は同様である。さらに、上記例では接着は2カ所備える例を示したが、接着部26または27の何れか一方でも本発明の効果は奏するが、上記例のように2カ所設ける方が信頼性が高く好ましい点も同様である。
【0038】
他の例を図6を参照して説明する。図6は本発明の他の実施例における記録再生装置に組み込んだ光ピックアップの要部斜視図である。図6においても、図1〜図5と同様の機能を発揮する要素については同一符号を付与すると共に説明は割愛する。図4及び図5と異なる構成は、延在部24及び25と光学基台7との境界部近傍の光学基台7に壁部28及び29を備え、延在部24及び25に備えた貫通部30及び31を光学基台7に備えた壁部32及び33が突き抜け、接着部26及び27を壁部28と壁部32との間及び壁部29と壁部33との間に備えた点である。この構成を採用すると、図4と図5で説明した効果が全て実現できるばかりでなく、接着箇所も離隔した4カ所が実現できるためより強固な接着が可能となり、また接着剤の調粘を適正化することで延在部24及び25と光学基台7との重なり部分に例えば毛細管現象で接着剤を回り込ますことも可能となり、従来技術よりも高強度の接着も可能である。
【0039】
なお、図6に示した接着部26及び27は、上述したように、開口部23から視認できる範囲から接着剤を滴下することで極めて容易に形成できる。また、接着部26で接着する際に光ピックアップを主軸17及び副軸19に沿って接着部27側に移動し、開口部23から接着部26を視認しやすくした後滴下、接着部27の場合には逆に光ピックアップを主軸17及び副軸19に沿って接着部26側に移動し、開口部23から接着部27を視認しやすくした後滴下すると、接着工程を容易化できるため好ましい点は同様である。さらに、上記例では接着は2カ所備える例を示したが、接着部26または27の何れか一方でも本発明の効果は奏するが、上記例のように2カ所設ける方が信頼性が高く好ましい点も同様である。
【0040】
【発明の効果】
以上のように本発明によれば、光ピックアップを開口部を備えた蓋体の凹部内側に設置する記録再生装置に取り付けた状態で、光ピックアップと情報層との光軸の傾きを調整するため、光ピックアップを記録再生装置装着前に別途スキュー調整治具にてアクチュエータ手段と光学基台との取り付け角度を決め、対物レンズ駆動装置と対物レンズ駆動装置以外の光ピックアップ部品を接着固定する従来の場合と比較して、実際の記録再生装置で生じている光ピックアップを支え位置決めをする主軸及び副軸と情報媒体を位置決めするターンテーブルとの相対的な角度誤差、光ピックアップと情報媒体の取り付け角度関係のずれも補正した正確なスキュー調整が行うことができる。
【0041】
上述のように高いスキュー調整精度を達成したアクチュエータベースと光学基台とを延在部を介して開口部の開口範囲内にて接着剤を滴下または注入することで接着するため、スキュー調整ずれがない光ピックアップを実現できる。
【0042】
このように本発明は、簡単な構成にて調整工数が少なく、精度が高く、かつ作業性のよい記録再生装置を実現できる優れた効果を持つものである。
【図面の簡単な説明】
【図1】本発明の一実施例における記録再生装置の要部分解斜視図
【図2】同実施例における光ピックアップの要部斜視図
【図3】本発明の他の実施例における記録再生装置の要部分解斜視図
【図4】同実施例における光ピックアップの要部斜視図
【図5】本発明の別の同実施例における光ピックアップの要部斜視図
【図6】本発明の他の同実施例における光ピックアップの要部斜視図
【図7】従来の記録再生装置の要部分解斜視図
【図8】同例における光ピックアップの要部正面図
【符号の説明】
1 対物レンズ
2 レンズホルダー
3 駆動手段
4 アクチュエータ手段
5 アクチュエータカバー
6 アクチュエータベース
7 光学基台
8 板バネ
9 固定部材
10 貫通孔A
11 係止部A
12 スキュー手段A
13 貫通孔B
14 係止部B
15 スキュー手段B
16 主軸受
17 主軸
18 副軸受
19 副軸
20 蓋体
21 ターンテーブル
22 レーザ
23 開口部
24、25 延在部
26、27 接着部
28、29 壁部
30、31 貫通部
32、33 壁部
[0001]
[Industrial application fields]
The present invention relates to a recording / reproducing apparatus for reproducing or recording an information medium.
[0002]
[Prior art]
FIG. 5 is an exploded perspective view of a main part of an optical pickup applied to a conventional optical disk recording / reproducing apparatus, and FIG. 6 is a front view of the main part of the optical pickup. Reference numeral 101 denotes an objective lens, 102 denotes a lens holder for holding the objective lens 101, 103 denotes a driving means for driving the optical disk (not shown) in the radial direction, the tangential direction, and the optical axis center direction of the objective lens 101, 104 Is an elastic support member (metal wire in the figure) for elastically supporting the movable part including the objective lens 101, the lens holder 102 and the driving means 103 and the actuator base 105, and 106 is an optical base.
[0003]
The actuator base 105 engages with the deformed portion of the plate spring 107, and the actuator base 105 is elastically pressed against the optical base 106 by fixing the plate spring 107 to the optical base 106 by the fixing member 108. The optical base 106 includes a main bearing 111 and a sub-bearing 112 that engage with the main shaft 109 and the sub-shaft 110, respectively, and an optical pickup is provided by fixing the main shaft 109 and the sub-shaft 110 to a recording / reproducing unit (not shown). Is attached to a recording / reproducing apparatus.
[0004]
In order to record an information signal on the information layer of the optical disc or to reproduce (hereinafter referred to as recording / playback) information previously recorded on the information layer of the optical disc, a light beam is focused on a predetermined information layer of the optical disc. As described above, it is essential to perform an optical axis angle adjustment (hereinafter also referred to as a skew adjustment) that matches the optical axis center of the light beam emitted from the light source 120 with the optical axis center of the objective lens. The skew adjustment may be performed by adjusting the radial direction and the tangential direction of the optical disk. The optical disk 106 is engaged with the screw hole 114 provided in the actuator base 105 via the through hole 113 provided in the optical base 106, and is mainly radial. The screw screw 117 provided in the actuator base 105 is engaged with the skew screw 115 for adjusting the optical axis in the direction and the through hole 116 provided in the optical base 106, and the optical axis in the tangential direction is mainly adjusted. Skew adjustment is performed by the skew screw 118.
[0005]
After the skew adjustment, as shown in FIG. 6, the actuator base 105 and the optical base 106 are affected by vibrations and / or impacts or the like by the adhesive portions 119 (four locations in the figure) obtained by applying and curing an adhesive at a plurality of locations. Suppresses optical axis deviation.
After bonding with an adhesive in this manner, the main shaft 109 and the sub shaft 110 are assembled into the main bearing 111 and the sub bearing 112, respectively, and the optical pickup incorporated into the main shaft 109 and the sub shaft 110 is mounted on the recording / reproducing unit, and then the main shaft 109 The relative angle adjustment between the auxiliary shaft 110 and the turntable on which the disk is placed and held is corrected.
[0006]
Therefore, after the main shaft 109 and the sub shaft 110 in which the optical pickup is incorporated in advance are mounted on the recording / reproducing unit, when the skew is adjusted by the skew screws 115 and / or 118, the optical axis center of the objective lens 101 and the light beam emitted from the light source 120 are adjusted. Since the optical axis angle adjustment with respect to the optical axis center and the relative angle adjustment among the main shaft 109, the sub shaft 110, and the turntable can be performed at a time, the adjustment process can be simplified.
[0007]
On the other hand, recording / reproducing apparatuses using optical discs have begun to be compact disc players, and recently, are widely used as DVD recording / reproducing apparatuses. In such a recording / reproducing apparatus, since the optical pickup is disposed opposite to the optical disc, the user can directly touch the optical pickup. For example, driving of the driving means 103 that drives the objective lens 101 by touching the optical pickup. There is a possibility of electric shock by touching a current flowing part such as a driving unit 103 or a circuit of a recording / reproducing unit (not shown) that impairs the characteristics. As shown in FIG. 5, the objective lens 101 moves in the radial direction of the disk. A lid 122 having an opening 121 having a moving length and a width that does not block the light beam emitted from the objective lens, and most of the constituent elements of the recording / reproducing apparatus such as an optical pickup, a disk drive motor, and a recording / reproducing circuit. Recording of a safe configuration including a turntable 123 that covers the inside of the concave side and mounts and holds the disk on the convex surface of the lid 122 Raw devices are also out is proposed.
[0008]
In order to simplify the adjustment process described above in the recording / reproducing apparatus having the lid 122 with emphasis on safety, an optical pickup incorporated with the main shaft 109 and the sub-shaft 110 is attached in advance to the recording / reproducing unit included in the lid 122. Then, a configuration is being studied in which both the safety and the manufacturing efficiency are improved by adjusting the skew with the skew screws 115 and 118.
[0009]
[Problems to be solved by the invention]
However, in the recording / reproducing apparatus in which the main shaft 109 and the sub-shaft 110 in which the optical pickup is previously incorporated in the lid body 122 having the opening 121 shown in FIG. 5 is mounted, the disc placed on the turntable 123 and the main and sub-shafts Can be adjusted by machining, but the skew adjustment between the optical axis center of the light beam emitted from the light source 120 and the optical axis center of the objective lens 101 is performed on the information layer of the disc. Therefore, it is not possible to achieve it with just machining accuracy. Therefore, although the skew adjustment itself can be performed by rotating the skew screws 115 and 118 from the back side of the recording / reproducing unit (not shown) existing inside the concave side of the lid 122, the change in the optical axis angle is suppressed after the skew adjustment. As shown in FIG. 6, a plurality of bonding portions 119 are provided at positions separated from the movable portion including the lens holder 102, the driving means 103, and the elastic support member 104 (hereinafter collectively referred to as actuator means). This is impossible due to the three-dimensional structure of the actuator base 105, the optical base 106, and the drive body.
[0010]
If the adhesive portion 119 is not provided, the position of the actuator means relative to the optical base 106 is regulated by the elastic pressing force of the leaf spring 107, the tightening force between the skew screw 115 and the screw hole 114, and the tightening force between the skew screw 118 and the screw hole 117. It is only the power of these three parties. However, the tightening force between the skew screws 115 and 118 and the screw holes 114 and 117 is extremely fragile because it is originally a tightening force for skew adjustment, and even a slight impact impairs the skew adjustment and effectively functions as an optical pickup. The problem of not occurring.
[0011]
An object of the present invention is to provide a recording / reproducing apparatus that is resistant to vibration, drop impact, and the like and takes safety into account.
[0012]
[Means for Solving the Problems]
In order to solve the above-described problems, a recording / reproducing apparatus of the present invention includes a turntable that engages with a center hole of an information medium and rotates the information medium, and a main shaft that is disposed in parallel with the radial direction of the information medium. An objective lens that is pressed through an actuator base to an optical base engaged with the sub-axis and focuses a light beam on an information layer of the information medium, and the objective lens in a radial direction, a tangential direction of the information medium, and Actuator means comprising driving means for driving in the direction of the optical axis of the objective lens, and an opening having an opening in a range where the objective lens moves on the information layer in the radial direction and is irradiated with at least the light beam; The convex surface is provided with the turntable, and the main shaft and the front are spaced at an interval greater than the length of the opening in the tangential direction inside the concave side. A cover body fixed to the sub-axis and provided in the actuator base, facing the opening, substantially perpendicular to the optical axis center of the objective lens and extending in the radial direction beyond the actuator means. An extending portion and an adhesive portion at a boundary portion between the extending portion and the optical base are provided.
[0013]
Further, the optical base includes a wall portion that engages with the extending portion in the recording / reproducing apparatus via the adhesive portion and protrudes toward the actuator means side.
[0014]
Moreover, the extending part in any one of the recording / reproducing apparatuses is provided with a penetrating part through which the wall part penetrates.
[0015]
In addition, any one of the above-described methods for manufacturing a recording / reproducing apparatus includes: a turntable that engages with a center hole of an information medium and rotates the information medium; and a main shaft that is disposed in parallel with each other in a radial direction of the information medium. An objective lens that is pressed through an actuator base to an optical base engaged with the sub-axis and focuses a light beam on an information layer of the information medium, and the objective lens in a radial direction, a tangential direction of the information medium, and An actuator unit having a driving unit that drives the objective lens in the direction of the optical axis of the objective lens, and an opening having an aperture in a range in which the objective lens moves on the information layer in the radial direction and transmits at least the light beam. A lid provided on the actuator base and a position facing the opening, and substantially perpendicular to the optical axis center of the objective lens An extending portion extending from the actuator means in the radial direction, a skew means A for adjusting an optical axis angle mainly in the radial direction of the optical axis center of the objective lens, and an optical axis center of the objective lens mainly Engage with the skew means B for adjusting the optical axis angle in the tangential direction, and at positions corresponding to the through hole A and the through hole B provided in the optical base, the through hole A and the through hole B, A locking portion A and a locking portion B for locking the skew means A and the skew means B provided in the actuator base, the turntable being disposed on the convex surface of the lid, The actuator means is press-engaged with the optical base, the main shaft and the sub shaft are engaged with the optical base, and the tangential way of the opening is formed inside the concave side of the lid. The main axis and the sub-axis are fixed at intervals equal to or longer than the length of the optical axis, and the skew means A and the skew means B adjust the optical axis center of the objective lens in the radial direction and the tangential direction. An adhesive is dropped from the opening at the boundary between the opening and the optical base.
[0016]
Embodiment
According to a first aspect of the present invention, there is provided a recording / reproducing apparatus according to a first aspect of the present invention, wherein an extension portion extending from the actuator means is provided on the actuator base, and an adhesive portion is provided at a boundary portion between the extension portion and the optical base. An optical pickup with an adjusted optical axis angle can be bonded to the optical base while maintaining the parallelism between the main shaft and the secondary shaft with which the information base placed on the turntable and the optical base engage with the processing accuracy. As a result, it is possible to provide a recording / reproducing apparatus that has resistance to vibration, drop impact, and the like, and that is provided with a lid so that safety is taken into account.
[0017]
In the recording / reproducing apparatus according to the second aspect of the present invention, the adhesive flows out along the side surface of the optical base by the configuration in which the extending portion engages the optical base with the wall portion engaged through the adhesive portion, By fixing at the wall surface and / or the recording / reproducing unit, it is possible to suppress the possibility that the operation reliability of the optical pickup and / or the recording / reproducing unit is inferior, and the outflow amount of the adhesive at the interface between the extending portion and the optical base is reduced. The amount of the adhesive can be controlled to the minimum by suppressing, and the bonding area can be increased and the bonding strength can be improved because the bonding portion exists over the extending portion, the optical base, and the wall portion.
[0018]
According to a third aspect of the present invention, there is provided a recording / reproducing apparatus according to the present invention, wherein the extending portion is provided with a penetrating portion that penetrates the wall portion, so that the wall portion is provided between the adhesive portion and the actuator means. The adhesive flows into the boundary between the means and the optical base, so that the actuator characteristics can be prevented from being impaired, and there is an adhesive part extending from the wall part, the extension part, and the optical base protruding from the penetration part. As a result, the adhesion area can be increased and the adhesion strength can be improved.
[0019]
According to a fourth aspect of the present invention, there is provided a method of manufacturing a recording / reproducing apparatus according to the present invention, wherein after the skew is adjusted by the skew means A and B, the adhesive is dropped from the opening to the boundary between the extension and the optical base. Since the optical axis angle of the optical pickup is adjusted in a state in which the main shaft and the sub shaft with which the optical base is engaged are arranged in parallel with the information medium placed on the turntable through the opening, After adjusting the actuator means so that signals can be accurately transmitted to and received from the information layer of the information medium, the actuator means can be bonded and fixed only to the optical base, and the optical axis angle adjustment step is performed at once. The state in which the optical axis angle of the actuator means is adjusted with respect to the information medium can be protected from deviation due to vibration or drop impact.
[0020]
【Example】
An embodiment of a recording / reproducing apparatus of the present invention will be described in detail with reference to the drawings. FIG. 1 is an exploded perspective view showing a main part of a recording / reproducing apparatus according to an embodiment of the present invention, and FIG. 2 is a perspective view of a main part of an optical pickup incorporated in the apparatus of the same embodiment. Reference numeral 1 denotes an objective lens, 2 denotes a lens holder for holding the objective lens 1, 3 is fixed to the lens holder 2, and the objective lens 1 is placed in a radial direction of a disc (not shown) (so-called radial direction) and a tangential direction (so-called tanger) of an information medium. Driving means for driving in the direction of the optical axis of the objective lens 1 (so-called focusing direction). Reference numeral 4 denotes actuator means including the objective lens 1, the lens holder 2, and the driving means 3. The actuator means 4 includes an actuator cover 5 that regulates the position of the objective lens 1 on the inner information medium side in the direction of the optical axis center. The actuator means 4 is engaged with the actuator base 6 via an elastic body (not shown) such as a metal wire.
[0021]
The actuator base 6 is elastically engaged with the optical base 7 by engaging the deformed portion of the leaf spring 8 and the fixing member 9. Further, it engages with the through hole A10 of the optical base 7 and the locking portion A11 of the actuator means 4 (not shown because it is hidden in FIG. 1, see FIG. 2), and the optical axis center of the objective lens 1 is not fixed. The center of the optical axis of the objective lens 1 is engaged with the skew means A12 that mainly adjusts the angle in the radial direction of the illustrated information medium, and the through hole B13 of the optical base 7 and the locking portion B14 of the actuator means 4. The actuator base 6 and the optical base 7 are engaged via a skew means B15 that mainly adjusts the angle of the information medium in the tangential direction.
[0022]
When the main shaft 17 passes through the main bearing 16 of the optical base 7 and the sub shaft 19 passes through the sub-bearing 18, the optical base 7 can move in the radial direction and reproduce information recorded in advance on the information medium, or A predetermined information signal is recorded on the information medium. Further, the main shaft 17 and the sub shaft 19 penetrating the main bearing 16 and the sub bearing 18 are mounted inside the concave side of the lid body 20. Further, the convex surface of the lid 20 is provided with a turntable 21 for placing and holding an information medium (not shown). Although not shown, the lid 20 has a drive motor for transmitting driving force to the turntable 21 and a recording / reproducing unit such as various control units for transferring information signals to the information medium. is doing.
[0023]
Next, adjustment of the optical path of the light beam emitted from the light source will be described. As a light source of the optical pickup, a semiconductor laser (hereinafter referred to as a laser) 22 is applied as is well known. The light beam emitted by the laser 22 irradiates the information layer of the information medium (not shown) through the objective lens 1 and the reflected light reflected by the information layer enters the photoelectric conversion element (not shown) through the objective lens 1. Then, it is converted into an electrical signal that is a source of information signals, focusing control, tracking control, etc. of the information layer.
[0024]
Therefore, accurately adjusting the optical path from the laser 22 to the objective lens 1, the information layer, the objective lens 1, and the photoelectric conversion element is a lifeline of the optical pickup. In particular, with the high-density recording of information media, the optical path adjustment (hereinafter referred to as skew adjustment) is required to have higher accuracy.
[0025]
The skew adjustment is a so-called tilt adjustment of the light beam with respect to the surface of the information layer. The skew adjustment is performed by correcting the tilt of the information medium in the tangential direction and the radial direction. That is, the skew adjustment is completed by adjusting the inclination in the radial direction mainly with respect to the information layer by the skew means A12 and adjusting the inclination in the tangential direction mainly with respect to the information layer by the skew means B15. That is, the skew means A12 is locked to the locking portion A11 provided in the actuator base 6 through the through hole A10 provided in the optical base 7, and the skew means B15 is provided in the actuator base via the through hole B13 provided in the optical base 7. 6 is performed by engaging with the engaging portion B14 provided in the apparatus 6. In general, the skew means A12 and B15 are applied with screws and are also referred to as skew screws, and the locking portions A11 and B14 are applied with female screws for tightening the skew screws. However, the screw holes may be cut in the through holes A10 and B13, and the locking portions A11 and B14 may be flat plates on which the skew screws come into contact, and various other methods can be applied.
[0026]
As described above, the skew adjustment in the present embodiment is performed by fixing the main shaft 17 and the sub shaft 19 engaged with the main bearing 16 and the sub bearing 18 in the recess of the lid 20 as described above, so that the optical pickup is previously provided in the recording / reproducing apparatus. However, the skew adjustment itself can be easily performed by, for example, engaging and rotating the skew means A12 and B15 from the back surface (lower side in FIG. 1) of the recording / reproducing apparatus.
[0027]
Such skew adjustment in this embodiment can adjust the inclination of the optical axis of the light beam emitted from the laser 22 with respect to the information layer in the state of being incorporated in the recording / reproducing apparatus. For example, compared with the prior art in which the mounting angle between the optical axis center of the objective lens 1 and the optical base 7 is determined by a skew adjustment jig and then the actuator base 6 and the optical base 7 are bonded and fixed, Since correction including the relative angular error between the main shaft 17 and the sub shaft 19 and the turntable 21 generated in the recording / reproducing apparatus can be performed, a highly accurate skew adjustment is possible. Further, in a recording / reproducing apparatus using an information medium having a high recording density such as a DVD disk, for example, the main shaft 17 and the sub-shaft 19 with respect to the turntable 21 are incorporated in the recording / reproducing apparatus after adjustment using the skew jig. However, since the skew adjustment can be completed in one time by adopting the skew adjustment of this embodiment, there is an effect of reducing the adjustment man-hours with high accuracy.
[0028]
The optical pickup with the skew adjusted as described above can accurately exchange information signals with respect to the information layer of the information medium. In practice, however, the drive motor and / or actuator drive and Due to the so-called disturbance externally applied to the apparatus due to vibration in the apparatus due to the reciprocating movement of the information medium in the radial direction of the optical base 7 along the main axis 17 and the sub axis 19 and / or the impact or dropping, etc. As described above, skew adjustment is very easily caused, and the function as a recording / reproducing apparatus is completely impaired.
[0029]
Therefore, after adjusting the skew, it is required that the actuator base 6 and the optical base 7 are bonded and fixed to prevent the actuator base 6 from being displaced from the optical base 7. As in the prior art, it is safe to provide the bonding and fixing place at a position separated from components such as the actuator means 4 and the leaf spring 8 that are directly related to the operation of the objective lens 1. In the optical pickup incorporated in the concave portion of the recording head, a rigid object such as a driver can be inserted from the back surface direction of the recording / reproducing apparatus that has performed skew adjustment, but it is impossible to apply a liquid adhesive, It can be provided only in a range that can be seen from the opening 23 provided in the lid 20.
[0030]
Therefore, in the present embodiment, the extension portions 24 and 25 extending in the radial direction from the actuator means 4 to the actuator base 6 are within a range that is visible from the opening portion 23 (preferably directly below the opening portion 23), and the extension Adhesive portions 26 and 27 are provided at the boundary with the optical base 7 in contact with the portions 24 and 25. By adhering the boundary between the actuator base 6 and the optical base 7 after skew adjustment in this way, it is possible to suppress the problem of skew adjustment due to internal vibration and / or disturbance, and adjust as described above. Reduces man-hours and maintains skew with high accuracy.
[0031]
The adhesive provided to the adhesive portions 26 and 27 may be any solvent-evaporating adhesive or curable adhesive as long as it is a substance having an adhesive property that solidifies from a liquid or fluid, but changes with time. In view of the influence on environmental components and components such as an optical pickup, a curable type is preferable. In addition, in order to perform adhesion after being incorporated in the recording / reproducing apparatus, among the curable adhesives, it is desirable to use the energy beam irradiation curable type or the combined use of the energy beam irradiation curable type and the heat curable type. Further, by optimizing the viscosity of the adhesive, it is possible to selectively provide the adhesive only on the extending portions 24 and 25 and the optical base 7, or the extending portions 24 and 25 and the optical base can be provided. It is also possible to allow the adhesive to flow into the engagement surface with the base 7. As the adhesive for flowing into the engagement surface, it is desirable to use both the energy ray irradiation curable type and the heat curable type.
[0032]
As a bonding method, for example, a predetermined amount of liquid adhesive is dropped or injected into the bonding portions 26 and 27 with a nozzle or the like (both are collectively referred to as dropping), and thereafter, for example, ultraviolet irradiation or heating is performed. This can be easily achieved by curing the adhesive. In addition, when the optical pickup is moved to the adhesive portion 27 side along the main shaft 17 and the auxiliary shaft 19 when the adhesive portion 26 is bonded, the adhesive portion 26 can be easily seen from the opening 23, and then dropped and bonded. On the other hand, it is preferable to move the optical pickup along the main shaft 17 and the sub shaft 19 to the bonding portion 26 side and to make the bonding portion 27 visible from the opening 23 and then drop it, since the bonding process can be facilitated. In addition, although the example which provides adhesion | attachment in two places was shown in the said example, although the effect of this invention is show | played in either the adhesion part 26 or 27, it is more reliable and preferable to provide two places like the said example.
[0033]
Although it is easy to apply if the adhesive applied at the time of adhesive fixing is low in viscosity, the adhesive flows out from the position to be bonded because the fluidity of the adhesive is high, and the outflowed adhesive flows into the actuator means 4, the leaf spring 8, etc. There is a concern that the characteristics of the optical pickup may be impaired by unnecessarily bonding members important for actuator characteristics. Therefore, by providing a suppressing portion that suppresses the outflow of the adhesive in the vicinity of the bonded portion, the characteristics of the optical pickup can be maintained and guaranteed.
[0034]
One example thereof will be described with reference to FIGS. FIG. 3 is an exploded perspective view of a main part of a recording / reproducing apparatus according to another embodiment of the present invention, and FIG. 4 is a perspective view of a main part of an optical pickup incorporated in the apparatus of the same embodiment. However, elements exhibiting the same functions as those in FIGS. 1 and 2 are given the same reference numerals and description thereof is omitted. A configuration different from the above-described embodiment is that the optical base 7 in the vicinity of the boundary between the extending portions 24 and 25 and the optical base 7 is provided with walls 28 and 29. By providing the walls 28 and 29, the adhesive flows out from the adhesive portions 26 and 27, and when the leaf spring 8 is reached, for example, fluctuations occur in the urging force between the actuator base 6 and the optical base 7. Alternatively, the side surfaces of the extending portions 24 and 25 and the actuator base 6 with respect to the optical base 7 are suppressed while suppressing the cause of the malfunction by transmitting the side of the optical base 7 and contaminating a recording / reproducing unit (not shown). (I.e., the side surface of the extending portions 24 and 25 facing the wall portions 28 and 29)-Adhering with the optical base 7 and the wall portions 28 and 29 can increase the bonding area, and as a result, the bonding strength can also be improved. There is an effect, and the operational reliability such as the temporal stability of the optical pickup can be improved.
[0035]
Note that the adhesive portions 26 and 27 shown in FIG. 4 can be very easily formed by dropping an adhesive from a range visible from the opening 23 as described above. In addition, when the optical pickup is moved to the adhesive portion 27 side along the main shaft 17 and the auxiliary shaft 19 when the adhesive portion 26 is bonded, the adhesive portion 26 can be easily seen from the opening 23, and then dropped and bonded. On the other hand, if the optical pickup is moved along the main shaft 17 and the sub shaft 19 to the bonding portion 26 side and the bonding portion 27 is made visible through the opening 23 and then dropped, the bonding process can be facilitated, so that the preferable point is It is the same. Further, in the above example, an example in which two adhesions are provided is shown. However, although either one of the adhesion portions 26 or 27 has the effect of the present invention, it is more preferable to provide two adhesions as in the above example. Is the same.
[0036]
Another example will be described with reference to FIG. FIG. 5 is a perspective view of an essential part of an optical pickup incorporated in a recording / reproducing apparatus according to another embodiment of the present invention. In FIG. 5 as well, elements that perform the same functions as in FIGS. 4 is different from FIG. 4 in that the wall portions 32 and 33 provided in the optical base 7 penetrate through the through portions 30 and 31 provided in the extending portions 24 and 25, and the adhesive portions 26 and 27 are provided with respect to the wall portions 32 and 33. This is a configuration provided outside the actuator base 6. When this configuration is adopted, the adhesive flows out from the adhesive portions 26 and 27 to the actuator base 6 side, and for example, contaminates an elastic body such as a metal wire (not shown), the actuator means 4 such as the lens holder 2, and the like. 3 and 4, as in the configuration described with reference to FIGS. 3 and 4, the extended portions 24 and 25 and the boundary side surface of the actuator base 6 with the optical base 7 (that is, the extended portions 24 and 25, the side facing the wall portions 28 and 29), the optical base 7, and the wall portions 32 and 33, which can be increased by bonding, and as a result, the adhesive strength can be improved. Can improve the operational reliability. In the present example, both the adhesive portions 26 and 27 are provided outside the actuator base 6 with respect to the wall portions 32 and 33. However, depending on the location of the through portions 30 and 31, the wall portions 32 and 33 and the actuator base are provided. 6, and either one may be provided between the actuator base 6 and the wall portion 32 or 33, and the other may be provided outside, or the actuator base 6 side of the walls 32 and 33 and the actuator. Of course, it may be provided on both outsides of the base 6.
[0037]
Note that, as described above, the adhesive portions 26 and 27 shown in FIG. 5 can be formed very easily by dropping an adhesive from a range visible from the opening 23. In addition, when the optical pickup is moved to the adhesive portion 27 side along the main shaft 17 and the auxiliary shaft 19 when the adhesive portion 26 is bonded, the adhesive portion 26 can be easily seen from the opening 23, and then dropped and bonded. On the other hand, if the optical pickup is moved along the main shaft 17 and the sub shaft 19 to the bonding portion 26 side and the bonding portion 27 is made visible through the opening 23 and then dropped, the bonding process can be facilitated, so that the preferable point is It is the same. Further, in the above example, an example in which two adhesions are provided is shown. However, although either one of the adhesion portions 26 or 27 has the effect of the present invention, it is more preferable to provide two adhesions as in the above example. Is the same.
[0038]
Another example will be described with reference to FIG. FIG. 6 is a perspective view of an essential part of an optical pickup incorporated in a recording / reproducing apparatus according to another embodiment of the present invention. Also in FIG. 6, elements that perform the same functions as those in FIGS. 1 to 5 are given the same reference numerals and description thereof is omitted. 4 and 5, the optical base 7 in the vicinity of the boundary between the extending portions 24 and 25 and the optical base 7 is provided with wall portions 28 and 29, and the extending portions 24 and 25 have through holes. The wall portions 32 and 33 provided with the portions 30 and 31 on the optical base 7 penetrated, and the adhesive portions 26 and 27 were provided between the wall portion 28 and the wall portion 32 and between the wall portion 29 and the wall portion 33. Is a point. When this configuration is adopted, not only the effects described with reference to FIGS. 4 and 5 can be realized, but also four places separated from each other can be realized, so that stronger adhesion is possible and the adhesive is properly controlled. As a result, it becomes possible to wrap the adhesive around the overlapping portions of the extending portions 24 and 25 and the optical base 7 by, for example, capillary action, and it is possible to bond with higher strength than in the prior art.
[0039]
Note that, as described above, the adhesive portions 26 and 27 shown in FIG. 6 can be very easily formed by dropping an adhesive from a range visible from the opening 23. In addition, when the optical pickup is moved to the adhesive portion 27 side along the main shaft 17 and the auxiliary shaft 19 when the adhesive portion 26 is bonded, the adhesive portion 26 can be easily seen from the opening 23, and then dropped and bonded. On the other hand, if the optical pickup is moved along the main shaft 17 and the sub shaft 19 to the bonding portion 26 side and the bonding portion 27 is made visible through the opening 23 and then dropped, the bonding process can be facilitated, so that the preferable point is It is the same. Further, in the above example, an example in which two adhesions are provided is shown. However, although either one of the adhesion portions 26 or 27 has the effect of the present invention, it is more preferable to provide two adhesions as in the above example. Is the same.
[0040]
【The invention's effect】
As described above, according to the present invention, in order to adjust the inclination of the optical axis between the optical pickup and the information layer in a state where the optical pickup is attached to the recording / reproducing apparatus installed inside the concave portion of the lid having the opening. Conventionally, the mounting angle between the actuator means and the optical base is determined by a separate skew adjusting jig before mounting the optical pickup on the recording / reproducing device, and the optical pickup parts other than the objective lens driving device and the objective lens driving device are bonded and fixed. Compared to the case, the relative angular error between the main and sub-axes for supporting and positioning the optical pickup generated in the actual recording / reproducing apparatus and the turntable for positioning the information medium, the mounting angle of the optical pickup and the information medium It is possible to perform accurate skew adjustment that corrects the deviation of the relationship.
[0041]
As described above, since the actuator base and the optical base that have achieved high skew adjustment accuracy are bonded by dropping or injecting an adhesive within the opening range of the opening portion through the extension portion, there is no skew adjustment deviation. No optical pickup can be realized.
[0042]
As described above, the present invention has an excellent effect of realizing a recording / reproducing apparatus with a simple configuration, a small number of adjustment steps, high accuracy, and good workability.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of a main part of a recording / reproducing apparatus according to an embodiment of the present invention.
FIG. 2 is a perspective view of a main part of the optical pickup in the embodiment.
FIG. 3 is an exploded perspective view of a main part of a recording / reproducing apparatus according to another embodiment of the present invention.
FIG. 4 is a perspective view of an essential part of the optical pickup in the embodiment.
FIG. 5 is a perspective view of an essential part of an optical pickup according to another embodiment of the present invention.
FIG. 6 is a perspective view of an essential part of an optical pickup according to another embodiment of the present invention.
FIG. 7 is an exploded perspective view of a main part of a conventional recording / reproducing apparatus.
FIG. 8 is a front view of an essential part of the optical pickup in the same example.
[Explanation of symbols]
1 Objective lens
2 Lens holder
3 Driving means
4 Actuator means
5 Actuator cover
6 Actuator base
7 Optical base
8 Leaf spring
9 Fixing member
10 Through hole A
11 Locking part A
12 Skew means A
13 Through hole B
14 Locking part B
15 Skew means B
16 Main bearing
17 Spindle
18 Secondary bearing
19 Secondary shaft
20 Lid
21 Turntable
22 Laser
23 opening
24, 25 Extension
26, 27 Bonding part
28, 29 Wall
30, 31 penetration
32, 33 Wall

Claims (4)

情報媒体の中心孔に係合し前記情報媒体を回転するターンテーブルと、
前記情報媒体のラジアル方向に対しそれぞれ平行に配置された主軸と副軸とが係合する光学基台にアクチュエータベースを介して押圧され、前記情報媒体の情報層に光ビームを集光する対物レンズ及び前記対物レンズを前記情報媒体のラジアル方向、タンジェンシャル方向及び前記対物レンズの光軸中心方向に駆動する駆動手段を備えるアクチュエータ手段と、
前記対物レンズが前記ラジアル方向に前記情報層上を移動し、少なくとも前記光ビームが照射する範囲の開口を有する開口部と、凸面には前記ターンテーブルとを備え、凹側内部に前記開口部の前記タンジェンシャル方向の長さ以上の間隔で前記主軸及び前記副軸が固定された蓋体と、
前記アクチュエータベースに備え、前記開口部に対向する位置であって、前記対物レンズの光軸中心と略直行し前記ラジアル方向に前記アクチュエータ手段よりも延在する延在部と、
前記延在部と前記光学基台との境界部に接着部とを有することを特徴とする記録再生装置。
A turntable that engages with a central hole of the information medium and rotates the information medium;
An objective lens that is pressed via an actuator base to an optical base that engages a main shaft and a sub shaft that are arranged in parallel with each other in the radial direction of the information medium, and focuses a light beam on the information layer of the information medium. And actuator means comprising driving means for driving the objective lens in a radial direction, a tangential direction of the information medium, and an optical axis center direction of the objective lens;
The objective lens moves on the information layer in the radial direction and includes an opening having an opening in a range at least irradiated with the light beam, a convex surface having the turntable, and a concave side inside the opening. A lid to which the main shaft and the sub shaft are fixed at intervals equal to or longer than the length in the tangential direction;
Provided in the actuator base, at a position facing the opening, extending substantially perpendicular to the optical axis center of the objective lens and extending in the radial direction from the actuator means;
A recording / reproducing apparatus comprising an adhesive portion at a boundary portion between the extending portion and the optical base.
延在部が接着部を介して係合すると共にアクチュエータ手段側に突出する壁部を光学基台に備えることを特徴とする請求項1記載の記録再生装置。2. The recording / reproducing apparatus according to claim 1, wherein the extending portion is engaged with the adhesive portion and a wall portion protruding toward the actuator means is provided on the optical base. 延在部に壁部が貫通する貫通部を備えることを特徴とする請求項1または2何れかに記載の記録再生装置。The recording / reproducing apparatus according to claim 1, wherein the extending portion includes a through portion through which the wall portion penetrates. 情報媒体の中心孔に係合し前記情報媒体を回転するターンテーブルと、
前記情報媒体のラジアル方向に対しそれぞれ平行に配置された主軸と副軸とが係合する光学基台にアクチュエータベースを介して押圧され、前記情報媒体の情報層に光ビームを集光する対物レンズ及び前記対物レンズを前記情報媒体のラジアル方向、タンジェンシャル方向及び前記対物レンズの光軸中心方向に駆動する駆動手段を備えるアクチュエータ手段と、
前記対物レンズが前記ラジアル方向に前記情報層上を移動し、少なくとも前記光ビームが透過する範囲の開口を有する開口部を備えた蓋体と、
前記アクチュエータベースに備え、前記開口部に対向する位置であって、前記対物レンズの光軸中心と略直行し前記ラジアル方向に前記アクチュエータ手段よりも延在する延在部と、
前記対物レンズの光軸中心を主に前記ラジアル方向に光軸角度調整するスキュー手段Aと、前記対物レンズの光軸中心を主に前記タンジェンシャル方向に光軸角度調整するスキュー手段Bとに係合し、前記光学基台に備えた貫通孔A及び貫通孔Bと、
前記貫通孔A及び前記貫通孔Bに対応する位置で、前記アクチュエータベースに備えた前記スキュー手段A及び前記スキュー手段Bを係止する係止部A及び係止部Bとを備え、
前記蓋体の凸面に前記ターンテーブルを配し、
前記アクチュエータベースを介して前記アクチュエータ手段を前記光学基台に押圧係合し、
前記主軸及び前記副軸を前記光学基台に係合し、
前記蓋体の凹側内部に前記開口部の前記タンジェンシャル方向の長さ以上の間隔で前記主軸及び前記副軸を固定し、
前記スキュー手段A及び前記スキュー手段Bで前記対物レンズの光軸中心を前記ラジアル方向及び前記タンジェンシャル方向に調整し、
前記延在部と前記光学基台との境界部に、接着剤を前記開口部から滴下することで請求項1〜3何れかに記載の記録再生装置を製造する方法。
A turntable that engages with a central hole of the information medium and rotates the information medium;
An objective lens that is pressed via an actuator base to an optical base that engages a main shaft and a sub shaft that are arranged in parallel with each other in the radial direction of the information medium, and focuses a light beam on the information layer of the information medium. And actuator means comprising driving means for driving the objective lens in a radial direction, a tangential direction of the information medium, and an optical axis center direction of the objective lens;
A lid provided with an opening having an opening in a range in which the objective lens moves on the information layer in the radial direction and at least transmits the light beam;
Provided in the actuator base, at a position facing the opening, extending substantially perpendicular to the optical axis center of the objective lens and extending in the radial direction from the actuator means;
The present invention relates to a skew means A for adjusting the optical axis angle of the objective lens mainly in the radial direction and a skew means B for adjusting the optical axis angle of the objective lens mainly in the tangential direction. A through hole A and a through hole B provided in the optical base,
A locking portion A and a locking portion B for locking the skew means A and the skew means B provided in the actuator base at positions corresponding to the through holes A and the through holes B;
Arranging the turntable on the convex surface of the lid,
Pressing and engaging the actuator means with the optical base via the actuator base;
Engaging the main shaft and the sub shaft with the optical base;
Fixing the main shaft and the sub shaft at an interval equal to or longer than the length in the tangential direction of the opening inside the concave side of the lid,
The skew means A and the skew means B adjust the optical axis center of the objective lens in the radial direction and the tangential direction,
The method for manufacturing a recording / reproducing apparatus according to claim 1, wherein an adhesive is dropped from the opening at a boundary portion between the extension portion and the optical base.
JP2001257371A 2001-08-28 2001-08-28 Recording / playback device Expired - Fee Related JP4389420B2 (en)

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JP4389420B2 true JP4389420B2 (en) 2009-12-24

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