JP3981293B2

JP3981293B2 - Light emitting / receiving unit and manufacturing method thereof

Info

Publication number: JP3981293B2
Application number: JP2002124633A
Authority: JP
Inventors: 功治南
Original assignee: Sharp Corp
Current assignee: Sharp Corp
Priority date: 2002-04-25
Filing date: 2002-04-25
Publication date: 2007-09-26
Anticipated expiration: 2022-04-25
Also published as: JP2003317307A

Description

【０００１】
【発明の属する技術分野】
本発明は、受発光ユニット及びその製造方法に係り、特に、光学的記録媒体への情報の書き込み及び／または光学的記録媒体の記録情報の読み出しに利用される小型光ピックアップ装置に好適な受発光ユニット及びその製造方法に関する。
【０００２】
【従来の技術】
近年、光ピックアップ装置においては、装置の小型化や軽量化を達成するために、各構成部分を一体化する手段が導入されており、その一例として、例えば特開平１０−１４３９３４号に開示の「光磁気ピックアップ装置」（以下、この装置を第１構成例という）や、特開平１０−２４１１８６号に開示の「光ピックアップ装置およびそれを備えた光学記録媒体駆動装置」（以下、この装置を第２構成例という）等が知られている。
【０００３】
ここで、図８は、前記第１構成例に係わる光磁気ピックアップ装置を示す側面図である。
【０００４】
図８に示されるように、この第１構成例の光磁気ピックアップ装置は、筐体８０の内部に、光ビーム放射源となるレーザーダイオード８１と、誤差信号検出用のフォトダイオード８２、８３と、情報信号検出用のフォトダイオード８４と、モニター用のフォトダイオード８５とを表面に形成したシリコン基板８６を配置し、筐体８０の開口部分をホログラム素子８７ａを有するガラスカバー８７により密封し、ガラスカバー８７上にＰ偏光とＳ偏光とで光反射率及び光透過率を異にする偏光分離膜８８ａを含む偏光プリズム８８とウォラストンプリズム８９とを一体化した複合プリズム９０を配置し、複合プリズム９０上に対物レンズ９１を配置したものである。また、この対物レンズ９１に対向した位置に光磁気ディスク９２が装着配置される。
【０００５】
この第１構成例の光磁気ピックアップ装置においては、筐体８０内に配置されたシリコン基板８６の表面に複数の受光素子、すなわち誤差信号検出用のフォトダイオード８２、８３と情報信号検出用のフォトダイオード８４、モニター用のフォトダイオード８５が同一平面上にあるように形成配置され、それぞれのフォトダイオード８２乃至８５には、偏光プリズム８８、ホログラム素子８７ａ等を用いて光ビームの光路が分岐、分割され、それぞれのフォトダイオード８２乃至８５に必要とする光ビームが入射するような構成になっている。
【０００６】
また、図９（ａ）、（ｂ）は、前記第２構成例に係わる光ピックアップ装置及びそれを備えた光学記録媒体駆動装置における投受光ユニットを示すもので、（ａ）はその分解斜視図、（ｂ）はその外観斜視図である。
【０００７】
図９（ａ）に示されるように、この投受光ユニット（受発光ユニットと同義）は、上フレーム１０１と、主フレーム１０２と、下フレーム１０３との３つのフレーム１０１乃至１０３からなっている。上フレーム１０１は、窪み状の支持面１０１ａに第１フォトダイオード（第１受光素子）１０４が配置され、主フレーム１０２は、同じく窪み状の支持面１０２ａに半導体レーザ素子（発光素子）１０５、透過型３分割用回折格子１０６、透過型ホログラム素子１０７、上反射ミラー１０８、下反射ミラー１０９がそれぞれ配置され、下フレーム１０３は、同じ窪み状の支持面１０３ａに第２フォトダイオード（第２受光素子）１１０が配置されている。
【０００８】
これらの３つのフレーム１０１乃至１０３は、それぞれの位置調整が行われた後、主フレーム１０２の上面（支持面１０２ａの形成側）に上フレーム１０１の下面（支持面１０１ａの非形成側）が、主フレーム１０２の下面（支持面１０２ａの非形成側）に下フレーム１０３の上面（支持面１０３ａの形成側）がそれぞれ貼着固定され、図１２（ｂ）に示されるように、それらのフレーム１０１乃至１０３が一体化され、投受光ユニツトが構成される。
【０００９】
【発明が解決しようとする課題】
一般に、光ピックアップ装置は、２つ以上の受光素子が搭載されており、より制御機能を高めるために搭載される受光素子の数が増える傾向にある。そして、光ピックアップ装置における受光素子の搭載数が増大し、受光素子の一体化の程度が高まると、それぞれの受光素子に他の受光素子に入射する光ビームの一部が入射する現象、すなわち迷光が発生するようになる。
【００１０】
ところで、第１構成例に係わる光磁気ピックアップ装置は、モニター用（光量制御用）のフォトダイオード８５を、誤差信号検出用のフォトダイオード８２、８３や情報信号検出用のフォトダイオード８４とともに同一平面内にあるように配置している。このような配置にした場合、これらのフォトダイオード８２乃至８５は、それぞれの受光面が同方向になるため、どうしても不必要な迷光を拾い易くなる。そして、これらのフォトダイオードの中に光量制御用のフォトダイオード８５が含まれている場合は、前記迷光の発生によって光量制御の精度を高めることが難しくなる。
【００１１】
このような迷光の発生を回避するため、光量制御用のフォトダイオード８５を貼着する場合に、光量制御用のフォトダイオード８５に迷光が入射しないような取付け位置を選んだり、光量制御用のフォトダイオード８５の取付け面を他のフォトダイオード８２乃至８４の取付け面に対して所定の角度（直角等）だけ傾ける等の工夫をしたりすればよいが、このような貼着作業は、同一平面上に複数個のフォトダイオードを取付けるときの作業に比べると効率が大幅に低下してします。
【００１２】
また、第２構成例に係わる投受光ユニツトは、複数のフォトダイオード（受光素子）１０４、１１０を貼着する際に、それらの受光面がそれぞれ異なる方向を向くように構成しているものであって、複数のフォトダイオード１０４、１１０の受光面がそれぞれ異なる方向を向くようにするため、主フレーム１０２の他に上フレーム１０１と下フレーム１０３とを用い、投受光ユニットの厚さ方向に上フレーム１０１、主フレーム１０２、下フレーム１０３を重ね合わせた状態に貼着するようにしている。そして、上フレーム１０１、主フレーム１０２、下フレーム１０３を３段重ねにした場合には、投受光ユニットの厚みが厚くなってしまい、一体化によって小型の光ピックアップ装置を構成することが難しくなる。
【００１３】
また、使用するフォトダイオードの数を増やしたい場合、すなわち、第１フォトダイオード１０４及び第２フォトダイオード１１０の他に、別のフォトダイオードを用いたい場合には、３つのフレーム１０１乃至１０３を用いる他に、別のフレームを用いる必要がなり、その結果、投受光ユニットの厚みがより厚くなってしまい、ひいては光ピックアップ装置の厚みが厚くなってしまう。
【００１４】
この他にも、前記第１構成例及び前記第２構成例に係わる光ピックアップ装置は、光ピックアップが駆動される際に、各受光素子から取り出される出力信号を一つの信号処理基板に供給するため、各受光素子から導出される出力信号をフィルム状回路基板等を用いて横並びの信線群にまとめて供給する必要があるが、このような構成にした場合、光ピックアップ装置を組立て、各受光素子から導出される出力信号をフィルム状回路基板を介して信号処理回路基板に供給するまで、光ピックアップ装置の電気的特性の状態を把握することができないもので、組立てられた光ピックアップ装置の電気的特性の状態が好ましくなかった場合、各受光素子の配置箇所等の調整を行わねばならない。
【００１５】
さらに、前記第１構成例及び前記第２構成例に係わる各光ピックアップ装置は、光ピックアップ装置を組立てる際に、光ピックアップ装置の基準面と投受光ユニツトの基準面との間に位置ずれが生じ、その位置ずれの影響により受光素子の出力信号に変化が生じたりすることがある。また、第１構成例での筐体、あるいは第２構成例での投受光ユニットの外部に取り付けた整形プリズムによって光ビームの整形を行うタイプのものにおいては、第１構成例での筐体、あるいは第２構成例での投受光ユニットの内部の受光素子への入射光強度分布が整形プリズムの配置誤差の影響によって変化してしまい、それにより受光素子の出力信号にも変化が生じたりするようになる。
【００１６】
本発明は、このような技術的背景に鑑みてなされたもので、その目的は、厚さを厚くせずに複数の受光素子をそれらの受光面がそれぞれ異なる方向を向くように配置し、組立直前の特性を把握することができ、かつ、各構成部品の一体化の度合いを高めた受発光ユニット及びその製造方法を提供することにある。
【００１７】
【課題を解決するための手段】
前記目的を達成させるために、本発明による受発光ユニットは、少なくとも、光ビームを放射する光源、前記光ビームを分岐する１つ以上の光ビーム分岐手段、光ビームの光路を屈曲変更する１つ以上の光路変更手段をそれぞれ凹部内に装着し、かつ複数の光ビーム出射口を有する第１光学部品装着部と、受光素子が貼着された２つ以上の第１保持板及び受光素子が貼着されない１つ以上の第２保持板の表面に、第１保持板及び第２保持板の接合部が屈曲可能にフィルム状回路基板を貼着した第２光学部品装着部とを備え、光源をフィルム状回路基板に設けたランド群に導電接続し、受光素子を受光面と同一面上の接続部と前記フィルム状回路基板に設けたランド群とで導電接続し、２つ以上の第１保持板に貼着した受光素子の受光面が他の受光素子の受光面と異なる方向を向くように、第１保持板を相互に接続するフィルム状回路基板の一部を屈曲し、１つ以上の光ビーム分岐手段のいずれかから分岐された光ビームが直接または１つ以上の光路変更手段のいずれかで屈曲されて対応する受光素子に入射するように相互配置し、かつ、前記受光素子とそこに導電接続される前記ランド群の少なくとも一組が光ビーム出射口の口径内に入る状態にし、第１光学部品装着部に第２光学部品装着部の第１保持板及び第２保持板を貼着するように構成した手段を備える。
【００１８】
前記手段によれば、受光素子を除いた各種の光学部品を搭載した第１光学部品装着部と、受光素子を貼着した２つ以上の第１保持板及び受光素子を貼着しない１つ以上の第２保持板の表面にフィルム状回路基板を貼着し、第１保持板及び第２保持板の接合部が屈曲可能になるように構成した第２光学部品装着部とを用い、第１光学部品装着部と第２光学部品装着部とを貼着する際に、始めに光源をフィルム状回路基板に設けたランドに導電接続し、次に２つ以上の第１保持板に貼着した受光素子の受光面が他の受光素子の受光面と異なる方向を向くように各第１保持板を屈曲し、その後１つ以上の光ビーム分岐手段のいずれかから分岐された光ビームが直接または１つ以上の光路変更手段のいずれかで屈曲されて対応する受光素子の入射するように相互配置し、その状態で第１光学部品装着部に第２光学部品装着部の第１保持板及び第２保持板を貼着するようにし、このとき、第２保持板に配置した受光素子とそこに導電接続されるランド群の少なくとも一組が第１光学部品装着部に設けた光ビーム出射口の口径内に入る状態に構成しているので、複数の受光素子を、複数の異なる配置面における各受光素子に最も適した位置に配置することができるとともに、貼着時における第２保持板と第１光学部品装着部との密着性が高まって小型化が可能になり、使用される受光素子の数が増しても、受発光ユニットの厚さを厚くすることなく、それらの受光素子を適宜好ましい状態に配置できるもので、受発光ユニットにおける構成部品の一体化の度合いが高く、同一平面に配置しないときの各受光素子の貼着や導電接続による効率の低下を防ぎ、しかも、受光素子からの出力信号の電気的特性を光ピックアップ装置を組立てたものと同じ状態での把握が可能になる。
【００２１】
また、前記手段における第１光学部品装着部は、光源が放射した光ビームを第１光学部品装着部から導出する２つ以上の開口部を有し、開口部の中の１つの開口部は光ビームを平行光にする手段により封止され、かつ他の開口部は、第１光学部品装着部と第１保持板及び第２保持板との間が密着することで封止されるようにしたものである。
【００２２】
このような構成にすれば、コリメータレンズと光源との配置誤差に伴う、受光素子への光ビームの入射状態の変化を除去することができ、かつ、第１光学部品装着部の内部を完全に封止することができる。
【００２３】
さらに、前記手段における第１光学部品装着部は、光源が放射した光ビームを第１光学部品装着部から導出する２つ以上の開口部を有し、開口部の中の１つの開口部は光ビームを平行光にする手段及び前記光ビームを整形する手段により二重封止され、かつ他の開口部は、第１光学部品装着部と第１保持板及び第２保持板との間が密着封止されることで封止されるようにしたものである。
【００２４】
このような構成にすれば、光ビーム整形を行うコリメータレンズや整形プリズムをあらかじめ装着した後で受光素子の位置調整を行うので、コリメータレンズを出射したときと、光媒体等で反射されて再度戻ってきたときとで、光ビーム形状変化を起こすような整形プリズムも一体化して、かつ各受光素子を最適に機能させることができる。また、コリメータレンズや整形プリズムにより受発光ユニットの内部を完全に封止することも可能になる。
【００２５】
また、前記手段における第１光学部品装着部及び第２光学部品装着部は、それらの貼着面のいずれか一方に円筒状位置決め凹部、他方にその凹部よりも小径の円筒状凸部が形成されているものである。
【００２６】
このような構成にすれば、第１光学部品装着部及び第２光学部品装着部の一方に凹部を、他方に凸部をそれぞれ形成しているので、受光素子の位置調整を行うときの初期位置の設定が簡単になる。
【００２７】
さらに、前記手段による受発光ユニットを用い、第１光学部品装着部に、光源から出射した光ビームを光学的記録媒体上に集光させる集光手段と、集光手段を光学的記録媒体の径方向に移行させる駆動手段とを配置して光ピックアップを構成したもので、駆動手段に基準となるミラー部が、第１光学部品装着部の、光源の装着面に平行した延長面上に形成されるものである。
【００２８】
このような構成にすれば、第１光学部品装着部が集光手段を光学的記録媒体の径方向に移行させる駆動手段の基準となるので、集光手段の傾きを第１光学部品装着部の一面を基準にして調整することができ、集光手段の組み込み精度を改善することができる。
【００２９】
また、前記手段による受発光ユニットの製造方法において、第１光学部品装着部の開口部を第２光学部品装着部によって封止する際に下記の処理手順、第１光学部品装着部の各開口部に第２光学部品装着部の対応する部分を仮貼着する工程と、第２光学部品装着部のフィルム状回路基板の一部を第１光学部品装着部の対応する部分に貼着する工程と、光源及び全受光素子をフィルム状回路基板に設けたランドに連続的に導電接続する工程と、全受光素子の位置とそれらの受光素子への光ビームの投射位置とを相互調整する工程と、第１光学部品装着部の開口部に第２光学部品装着部を完全貼着する工程をそれぞれ経て受発光ユニットを得ているものである。
【００３２】
このような構成にすれば、第１光学部品装着部と第２光学部品装着部とを貼着する前に、第２光学部品装着部のフィルム状回路基板の一部を第１光学部品装着部の対応部分に貼着することにより、光源と受光素子をフィルム状回路基板に同時に導電接続することができ、導電接続工程を迅速にかつ効率的に実行することができる。
【００３３】
また、前記手段による受発光ユニットの製造方法において、第１光学部品装着部の開口部を第２光学部品装着部によって封止する際に下記の処理手順、第１光学部品装着部の各開口部に第２光学部品装着部の対応する部分を仮貼着する工程と、第２光学部品装着部のフィルム状回路基板の一部を第１光学部品装着部の対応する部分に貼着する工程と、光源及び全受光素子をフィルム状回路基板に設けたランドに連続的に導電接続する工程と、光源を駆動させる工程と、光源から放射される光ビームを外部の光反射体で反射させ、そのときの反射光ビームの集光位置を観測しながら対応する光ビーム分岐手段の配置位置を調整固定する工程と、第１光学部品装着部の開口部に第２光学部品装着部を完全貼着する工程をそれぞれ経て受発光ユニットを得ているものである。
【００３４】
このような構成にすれば、光源をフィルム状回路基板に導電接続した後に、光源を発光させながら、光ビーム分岐手段の位置の調整を行うことにより、光ビーム分岐手段で光ビームを分岐した後の焦点方向の光ビームの入射位置の誤差を低減させることができる。
【００３５】
【発明の実施の形態】
以下、本発明の実施の形態を図面を参照して説明する。
【００３６】
図１は、本発明による受発光ユニットの第１の実施の形態に係わり、第１光学部品装着部の要部構成を示す斜視図である。
【００３７】
図１に示されるように、第１光学部品装着部１は、各種の光学部品が装着できるように形成された凹部１ａと、光ビームを放射する光源２と、光ビームを分岐する光ビームスプリッタ（光ビーム分岐手段）３と、光ビーム回折素子４と、光ビームの光路を屈曲変更する表面反射型４５度ミラー（光路変更手段）５とを有し、光源２、光ビームスプリッタ３、光ビーム回折素子４、表面反射型４５度ミラー５は、いずれも第１光学部品装着部１の凹部１ａ内に装着される。また、光学部品配置部材１は、凹部１ａの正面壁部に第１光ビーム出射口６、凹部１ａの一方の側面壁部に第２光ビーム出射口７、凹部１ａの他方の側面壁部に第３光ビーム出射口８が設けられる。
【００３８】
この場合、第１光ビーム出射口６は、光源２から放射された光ビームＬＡを直進状態で第１光学部品装着部１から外部に出射させる出射口であり、第２光ビーム出射口７は、光源２から放射された光ビームＬＡを光ビームスプリッタ３で直角方向に屈曲反射させることにより得られた光ビームＬＢを第１光学部品装着部１から外部に出射させる出射口であり、第３光ビーム出射口８は、第１光ビーム出射口６から出射された光ビームＬＡが光ピックアップ装置の外部の反射物体（例えば、光ディスク）によって反射され、その反射光ビームが光ビームスプリッタ３に戻り、再び直角方向に屈曲反射させることにより得られた光ビームＬＣを第１光学部品装着部１から外部に出射させる出射口である。また、光源２から放射された光ビームＬＡが光ピックアップ装置の外部の反射物体で反射され、その反射光ビームが光ビーム回折素子４に戻ったとき、その反射光ビームの一部が光ビーム回折素子４で回折され、回折光ビームとして表面反射型４５度ミラー５に向う。回折光ビームは、表面反射型４５度ミラー５で再度反射され、光ビームＬＤとして第１光学部品装着部１の高さ方向（ｙ方向）に投射される。
【００３９】
なお、第１光学部品装着部１においては、光ビーム分岐手段に光ビームスプリッタ３を用い、光路変換手段に表面反射型４５度ミラー５を用いた例を示しているが、光ビーム分岐手段として光ビームスプリッタ３の代わりに同等の機能を達成できる手段を採用してもよく、光路変換手段として表面反射型４５度ミラー５の代わりに同等の機能を達成できる手段を採用してもよい。
【００４０】
また、光ビーム分岐手段である光ビームスプリッタ３は、偏光の種類別に光透過率、光反射率が異なる特性を持った偏光ビームスプリツタや、偏光ビームスプリッタに複屈折性材料で形成した偏光分離素子を複合した形態の複合光学素子であってもよい。同様に、光ビーム分岐手段である光ビーム回折素子４は、入射光ビームを複数に分割する機能や、入射光ビームの発散角を変換する機能等が付加された光ビーム回折素子であってもよい。さらに、光路変換手段である表面反射型４５度ミラー５は、内部反射型４５度ミラーを用いてもよい。
【００４１】
次に、図２は、本発明による受発光ユニットの第１の実施の形態に係わり、第２光学部品装着部の要部構成を示す斜視図であり、図１に図示の第１光学部品装着部１に貼着されるものである。
【００４２】
図２に示されるように、第２光学部品装着部９は、３枚の第１保持板１０、１１、１２と、１枚の第２保持板１３と、３枚の第１保持板１０乃至１２と１枚の第２保持板１３の各表面に貼着されたフィルム状回路基板１４と、第１保持板１０のフィルム状回路基板１４貼着面側に貼着された受光素子１０ａと、第１保持板１１のフィルム状回路基板１４貼着面側に貼着された受光素子１１ａと、第１保持板１２のフィルム状回路基板１４貼着面側に貼着された受光素子１２ａと、を備える。また、フィルム状回路基板１４は、表面の複数箇所にランド群１５、１６、１７、１８が設けられ、フィルム状回路基板１４に形成された図示されない配線群によってこれらのランド群１５乃至１８がそれぞれ対応する駆動回路等に接続される。
【００４３】
この場合、ランド群１５は８つのランド部（図番なし）を有し、ランド群１６は６つのランド部（図番なし）を有し、ランド群１７は３つのランド部（図番なし）を有し、ランド群１８は２つのランド部（図番なし）を有している。受光素子１０ａは、その受光面の対応する箇所が８つのランド部に微細な金属線群（図番なし）によってそれぞれ導電接続され、受光素子１０ｂは、その受光面の対応する箇所が６つのランド部に微細な金属線群（図番なし）によってそれぞれ導電接続され、受光素子１０ｃは、その受光面の対応する箇所が３つのランド部に微細な金属線群（図番なし）によってそれぞれ導電接続される。このときの微細な金属線には金線あるいはアルミ・シリコンの合金線等が用いられる。
【００４４】
また、３枚の第１保持板１０乃至１２と１枚の第２保持板１３の各表面にフィルム状回路基板１４を貼着する場合、第１保持板１０、１１の接合部、第１保持板１０、１２の接合部、第１保持板１０と第２保持板１３の接合部にそれぞれ間隙を有する状態で貼着するようにし、第２光学部品装着部９を第１光学部品装着部第１に貼着する際に、第１保持板１０に対して、第１保持板１１、第１保持板１２、第２保持板１３のそれぞれを約９０°屈曲させることができるようにしている。
【００４５】
第２光学部品装着部９は、受光素子１１ａとランド群１６とを含んだ部分の大きさが第１光学部品装着部１に形成した第２光ビーム出射口７の口径よりも小さくなるように構成され、同様に、受光素子１２ａとランド群１７とを含んだ部分の大きさが第１光学部品装着部１に形成した第３光ビーム出射口８の口径よりも小さくなるように構成される。このように構成している理由は、後述するように、第１光学部品装着部１に第２光学部品装着部９を貼着した際に、受光素子１１ａとランド群１６とを含んだ部分が第２光ビーム出射口７の口径内に、受光素子１２ａとランド群１７とを含んだ部分が第３光ビーム出射口８の口径内にそれぞれ入ることにより、第２光学部品装着部９の第１保持板１１、１２を第１光学部品装着部１の対応する側面に隙間なく貼り合わせることができるようにするためである。
【００４６】
この第２光学部品装着部９においては、受光素子１０ａを貼着した第１保持板１０、受光素子１１ａを貼着した第１保持板１１、受光素子１２ａを貼着した第１保持板１２が互いに平行な貼着面を有しているので、各受光素子１０ａ、１１ａ、１２ａをそれぞれフィルム状回路基板１４に導電接続する際の操作性が良好になる。すなわち、この実施の形態に係わる受発光ユニットは、各受光素子１０ａ、１１ａ、１２ａを導電接続する際に、各受光素子１０ａ、１１ａ、１２ａの位置関係が同一平面上にあって、導電接続に適した状態にあり、一方、各受光素子１０ａ、１１ａ、１２ａの位置調整をする際に、各受光素子１０ａ、１１ａ、１２ａの位置関係が互いに異なる面上にあって、位置調整固定に適した状態に変化させることができるので、受発光ユニットの設計及び各受光素子１０ａ、１１ａ、１２ａの導電接続時の操作性等を個別に改善することができる。
【００４７】
なお、図２に図示の例においては、第２保持板１３に何の部品も装着されていないが、第２保持板１３上のフィルム状回路基板１４には、光源２に半導体レーザを用いる場合、光源２を駆動する直流電源に高周波を重畳させるための高周波発生回路部を実装することができる。
【００４８】
また、図２に図示の例において、３枚の第１保持板１０乃至１２と１枚の第２保持板１３の各表面に貼着されるフィルム状回路基板１４には、第１保持板１０と他の保持板１１、１２、１３との接合部にそれぞれ開口部を設けていないが、第１保持板１０に対して、第１保持板１１、第１保持板１２、第２保持板１３のそれぞれを屈曲させる際の屈曲性を高めるために、第１保持板１０と他の保持板１１、１２、１３との接合部のそれぞれに、それらの接合部に沿って延びる長い楕円形の開口部を設けるようにしてもよい。
【００４９】
次いで、図３及び図４は、第１光学部品装着部１と第２光学部品装着部９とを貼着して受発光ユニットを形成する際の製造過程を示す斜視図であって、図３は最初の状態、図４は最終の状態をそれぞれ表している。
【００５０】
図３及び図４において、１９は第１光学部品装着部１に設けた円筒状凸部、２０は第２光学部品装着部９の第１保持板１０に設けた円筒状凹部であり、その他、図１及び図２に示された構成要素と同じ構成要素については同じ符号を付けている。
【００５１】
この場合、円筒状凸部１９及び円筒状凹部２０は、調整開始位置（受光素子の設計時点での所定の位置）への位置決め用のもので、円筒状凸部１９の直径が円筒状凹部２０の直径よりも小さくなるように形成されている。
【００５２】
ここで、図３及び図４を用い、この受発光ユニットの製造過程について説明する。
【００５３】
始めに、図３に示されるように、図１に図示された第１光学部品装着部１の背面に、図２に図示された第２光学部品装着部９の第２保持板１３を当接し、第２保持板１３上から外側方向に延びているフィルム状回路基板１４を第１光学部品装着部１の背面に沿って折曲し、ランド群１８が形成されている突出部分を、第１光学部品装着部１の凹部１ａ内の光源２の配置部分の近傍に貼着する。
【００５４】
次に、光源２とランド群１８の対応するランド部とを金属線（図番なし）によって導電接続する。
【００５５】
次いで、光源２とランド群１８の対応するランド部とを導電接続した状態で、フィルム状回路基板１４における第１保持板１０、１１の接合部、第１保持板１０、１２の接合部、第１保持板１０と第２保持板１３の接合部をそれぞれ略９０°屈曲させ、第１光学部品装着部１の背面に第２保持板１３が、第１光学部品装着部１の両側面に第１保持板１１、１２が、第１光学部品装着部１の上面に第１保持板１０がそれぞれくるように、第２光学部品装着部９を折り畳むようにして第１光学部品装着部１に被せる。このとき、第１光学部品装着部１に設けた円筒状凸部１９を、第２光学部品装着部９の第１保持板１０に設けた円筒状凹部２０に嵌め込むことにより、第１光学部品装着部１と第１保持板１０との調整開始位置への位置決めが行われる。
【００５６】
続いて、図４に示されるように、第１光学部品装着部１に折り畳んだ第２光学部品装着部９を被せて受発光ユニットを仮形成した後、光源２を発光させ、位置調整が必要な受光素子１０ａ等の位置を調整する。この調整において、例えば、第１保持板１０上にある受光素子１０ａを位置調整する必要がある場合は、第１保持板１０上に設けられた凹部あるいは凸部（図示なし）に先端が係合するような専用のアーム（図示なし）を用い、第１保持板１０ごとに受光素子１０ａを移動させ、受光素子１０ａから出力された所定の信号がフィルム状回路基板１４を介して得られるように受光素子１０ａの位置を調整する。同じように、他の受光素子１１ａ、１２ａの位置の調整を行う。これらの受光素子１０ａ、１１ａ、１２ａの位置の調整が終了したら、第１光学部品装着部１の内部を封止するように第２光学部品装着部９を第１光学部品装着部１に貼着固定し、受発光ユニットが完成する。
【００５７】
このようにして得られた受発光ユニットは、第２光学部品装着部９の第１保持板１１、１２及び第２保持板１３が、第１光学部品装着部１と第２光学部品装着部９とを組み合わせる段階で、第１光学部品装着部１の側面側に配置されるので、受光素子１０ａ、１１ａ、１２ａの各受光面をそれぞれ異なる方向を向くように一体化できるだけなく、受発光ユニットの厚み（図３のＹ方向の厚さ）を第１光学部品装着部１の厚さと第１保持板１０の厚さとの和の範囲に収まっており、受発光ユニットの厚さを増すことなく、一体化の度合いを高めることができる。この場合、受発光ユニットを仮形成した状態で各受光素子１０ａ、１１ａ、１２ａから得られる信号の状態を、光ピックアップ装置（例えば、最も簡単なものは、この受発光ユニットと、同受発光ユニットからの出射光を光媒体に集光する手段とによって構成される）を組み上げたときと同じ信号の状態として把握することができ、受発光ユニット単体であっても、その性能を把握することができる。
【００５８】
さらに、この受発光ユニットの製造方法について述べると、第１光学部品装着部１に対し第２光学部品装着部９のフィルム状回路基板１４の一部、すなわちランド群１８が形成されている突出部分を凹部１ａに貼着した後に、光源２、各受光素子１０ａ、１１ａ、１２ａとフィルム状回路基板１４に設けた各ランド群１５、１５、１７、１８との間で連続的に導電接続を行えば、導電接続工程を迅速に効率的に行うことができる。
【００５９】
また、第１光学部品装着部１に装着する光ビーム分岐手段の中で、例えば、ビームスプリッタ３を装着固定する場合、光源２の導電接続を行った後の工程で、光源２を発光させてその放射光を受発光ユニットの外部の反射物体（光ディスク等）に投射し、反射物体から戻った反射光ビームを用い、ビームスプリツタ３を光源２からの放射光ビームの光軸に平行な方向（Ｚ方向）の位置を調整して固定することにより、受光素子１３ａ方向に分岐される光ビームが受光素子１３ａの受光面へ入射する際の焦点ずれ誤差を改善することができる。なお、外部のの反射物体としてコーナーリフレクタを用いれば、放射光ビームが平行光ビームであるか、集束光ビームであるかに係わりなく、ビームスプリッタ３の位置調整を簡単に行うことができる。
【００６０】
なお、この実施の形態においては、第１光学部品装着部１に円筒状凸部１９を設け、第２光学部品装着部９の第１保持板１０に円筒状凹部２０を設けているが、それとは逆に、第１光学部品装着部１に円筒状凹部２０を設け、第２光学部品装着部９の第１保持板１０に円筒状凸部１９を設けるようにしてもよい。また、第１光学部品装着部１と第１保持板１０との間の位置決めの精度が比較的ラフでよい場合、円筒状凸部１９を設けること及び円筒状凹部２０を設けることをそれぞれ省略するようにしてもよい。
【００６１】
続く、図５は、本発明による受発光ユニットの第２の実施の形態に係わり、第１光学部品装着部１の要部構成を示す斜視図である。
【００６２】
図５に図示されるように、第２の実施の形態に係わる第１光学部品装着部１は、図１に図示した第１の実施の形態の第１光学部品装着部１における第１光ビーム出射口６に、出射光ビームを平行光ビームに変換するコリメータレンズ２１を嵌め込んだものであり、その他の構成は第１の実施の形態の第１光学部品装着部１と同じである。なお、図５において、図１に図示された構成要素と同じ構成要素については同じ符号を付けている。
【００６３】
コリメータレンズを受発光ユニットに一体化する場合は、コリメータレンズ２１と光源２との位置関係の設計値からのずれが問題になってくるが、第２の実施の形態においてはそのずれの影響が出ないような方法で受発光ユニットを構成することができる。
【００６４】
第２の実施の形態に係わる第１光学部品装着部１は、第１光ビーム出射口６にコリメータレンズ２１をはめ込んだ後で、前述のように第１光学部品装着部１と第２光学部品装着部９とを貼着して、受発光ユニットを構成しているもので、例えば、コリメータレンズ２１と光源２との位置関係の設計値からのずれによる誤差を吸収し、開口部８の出口に戻り光の焦点位置を持ってくる操作、すなわちビームスプリッター３の位置を調整固定して第１光学部品装着部１を完成しておいて、さらに各受光素子１０ａ、１１ａ、１２ａの中の位置調整が必要な受光素子も、コリメータレンズ２１と光源２との位置関係の設計値からのずれの影響を吸収するようにして位置調整し、固定することができる。なお、コリメータレンズ２１により受発光ユニットの内部を封止することもできる。
【００６５】
続いて、図６は、本発明による受発光ユニットの第３の実施の形態に係わり、第１光学部品装着部１の要部構成を示す斜視図である。
【００６６】
図６に図示されるように、第３の実施の形態に係わる第１光学部品装着部１は、高さ方向（図のＹ軸方向）から見たとき、第１光学部品装着部１の全体の投影形状が台形になっているものであり、第１光学部品装着部１における第１光ビーム出射口６に出射光ビームを平行光ビームに変換するコリメータレンズ２１を嵌め込み、第１光学部品装着部１の傾斜部分にある第１光ビーム出射口６に整形プリズム２２を取付けているもので、それ以外の構成は第１の実施の形態の第１光学部品装着部１と同じである。なお、図６において、図１に図示された構成要素と同じ構成要素については同じ符号を付けている。
【００６７】
第３の実施の形態に係わる第１光学部品装着部１において、台形の斜辺部分の傾斜角θや整形プリズム２２の形状は、整形プリズム２２の硝材や整形比及び光源２から放射される光ビーム波長によって決まる。例えば、光源２から放射される光ビーム波長が４０５ｎｍであり、２つの面のなす角度が直角で、硝材ＢＫ７で加工された整形比が１．５倍の整形プリズム２２が用いられる場合、図６に示される傾斜角θは２３．１°であり、整形プリズム２２の頂角φは３２．８°である。
【００６８】
この第３の実施の形態による受発光ユニットは、第１光学部品装着部１にコリメータレンズ２１、整形プリズム２２をそれぞれ固定した後、第１光学部品装着部１に対し第２光学部品装着部９を貼着しているもので、光源２から出た光がコリメータレンズ２１を出射したときと、光媒体等で反射されて再度戻ってきたときとで、光ビーム形状を変化させるような整形プリズム２２を一体化しても、各受光素子１０ａ、１１ａ、１２ａの中の位置調整が必要な受光素子の位置に関して、この光ビーム形状の変化を反映した位置調整を行って固定することができる。なお、コリメータレンズ２１や整形プリズム２２により受発光ユニットの内部を封止することもできる。
【００６９】
次に、図７は、本発明による受発光ユニットの第４の実施の形態に係わり、その受発光ユニットと、その受発光ユニットからの出射光の集光手段とを合わせたピックアップ装置の要部構成を示す斜視図である。
【００７０】
図７に示されるように、第４の実施の形態による受発光ユニットを用いた光ピックアップ装置は、図５に図示された受発光ユニットと基本的に同じ構成要素を持つ受発光ユニットの他に、光路変換手段としての表面反射型４５度ミラー２３と、光ディスク２７の表面に光ビームを集束させる集光手段としての対物レンズ２４と、対物レンズ２４を駆動する駆動手段２５（一部だけが図示されている）とを備えている。なお、図７において、図５に図示された構成要素と同じ構成要素については同じ符号を付けている。
【００７１】
そして、第４の実施の形態による受発光ユニットは、第２の実施の形態による受発光ユニットにおける第１光学部品装着部１の形状を一部変更したもので、第１光学部品装着部１から延長した光源２の装着面と平行な突出面２６が設けられ、対物レンズ２４を駆動する駆動手段２５は、突出面２６上に突出面２６を基準にして組み立てられる。
【００７２】
この場合、対物レンズ２４を駆動する駆動手段２５は、対物レンズ２４が光ピックアップ装置の基準面に対して平行になるように組み立てられることになり、受発光ユニットからの出射光ビームを光ディスク２７の表面に集束させる対物レンズ２４を駆動する駆動手段２５を、受発光ユニットに高精度で組み込むことができる。
【００７３】
前記各実施の形態においては、第１光学部品装着部９が３枚の第１保持板１０、１１、１２と１枚の第２保持板１３とによって形成される例を挙げて説明したが、本発明による第１光学部品装着部９は３枚の第１保持板１０、１１、１２と１枚の第２保持板１３とによって形成される場合に限られるものではなく、２枚または４枚の第１保持板を有するものであってもよく、２枚またはそれ以上の第２保持板を有するものであってもよい。
【００７４】
【発明の効果】
以上のように、本発明による受発光ユニットによれば、受光素子を除いた各種の光学部品を搭載した第１光学部品装着部と、受光素子を貼着した２つ以上の第１保持板及び受光素子を貼着しない１つ以上の第２保持板の表面にフィルム状回路基板を貼着し、第１保持板及び第２保持板の接合部が屈曲可能になるように構成した第２光学部品装着部とを用い、第１光学部品装着部と第２光学部品装着部とを貼着する際に、始めに光源をフィルム状回路基板に設けたランドに導電接続し、次に２つ以上の第１保持板に貼着した受光素子の受光面が他の受光素子の受光面と異なる方向を向くように各第１保持板を屈曲し、その後１つ以上の光ビーム分岐手段のいずれかから分岐された光ビームが直接または１つ以上の光路変更手段のいずれかで屈曲されて対応する受光素子の入射するように相互配置し、その状態で第１光学部品装着部に第２光学部品装着部の第１保持板及び第２保持板を貼着するようにし、このとき、第２保持板に配置した受光素子とそこに導電接続されるランド群の少なくとも一組が第１光学部品装着部に設けた光ビーム出射口の口径内に入る状態に構成しているので、複数の受光素子を、複数の異なる配置面における各受光素子に最も適した位置に配置することができるとともに、貼着時における第２保持板と第１光学部品装着部との密着性が高まって小型化が可能になり、使用される受光素子の数が増しても、受発光ユニットの厚さを厚くすることなく、それらの受光素子を適宜好ましい状態に配置できるもので、受発光ユニットにおける構成部品の一体化の度合いが高く、同一平面に配置しないときの各受光素子の貼着や導電接続による効率の低下を防ぎ、しかも、受光素子からの出力信号の電気的特性を光ピックアップ装置を組立てたものと同じ状態での把握が可能になるという効果がある。
【００７５】
また、本発明による受発光ユニットの製造方法によれば、受発光ユニットを構成する光学部品の配置状態のバラツキに基づく各受光素子への光ビームの入射位置の変動の影響を、受光素子の位置調整時や第１光学部品装着部の作成時に排除することができ、整形プリズムを受発光ユニットに一体化する場合のように受光素子への入射光ビーム形状が変化する等の光ビームの入射状態変化を事前に反映した受発光ユニットを製造することができるという効果がある。
【図面の簡単な説明】
【図１】本発明による受発光ユニットの第１の実施の形態に係わり、第１光学部品装着部の要部構成を示す斜視図である。
【図２】本発明による受発光ユニットの第１の実施の形態に係わり、第２光学部品装着部の要部構成を示す斜視図である。
【図３】第１光学部品装着部と第２光学部品装着部とを貼着して受発光ユニットを形成する際の製造過程の初期状態を示す斜視図である。
【図４】第１光学部品装着部と第２光学部品装着部とを貼着して受発光ユニットを形成する際の製造過程の終了直前の状態を示す斜視図である。
【図５】本発明による受発光ユニットの第２の実施の形態に係わり、第１光学部品装着部の要部構成を示す斜視図である。
【図６】本発明による受発光ユニットの第３の実施の形態に係わり、第１光学部品装着部の要部構成を示す斜視図である。
【図７】本発明による受発光ユニットの第４の実施の形態に係わり、同受発光ユニットを用いた光ピックアップ装置の要部構成を示す斜視図である。
【図８】既知の第１構成例に係わる光磁気ピックアップ装置を示す側面図である。
【図９】既知の第２構成例に係わる光ピックアップ装置及びそれを備えた光学記録媒体駆動装置における投受光ユニットを示す構成図である。
【符号の説明】
１第１光学部品装着部
１ａ凹部
２光源
３光ビームスプリッタ（光ビーム分岐手段）
４光ビーム回折素子
５、２３表面反射型４５度ミラー（光路変更手段）
６第１光ビーム出射口
７第２光ビーム出射口
８第３光ビーム出射口
９第２光学部品装着部
１０、１１、１２第１保持板
１０ａ、１１ａ、１２ａ受光素子
１３第２保持板
１４フィルム状回路基板
１５、１６、１７、１８ランド群
１９円筒状凸部
２０円筒状凹部
２１コリメータレンズ
２２整形プリズム
２４対物レンズ
２５駆動手段
２６突出面
２７光ディスク[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a light emitting / receiving unit and a method for manufacturing the same, and more particularly to light receiving / emitting suitable for a small optical pickup device used for writing information to an optical recording medium and / or reading recorded information from an optical recording medium. The present invention relates to a unit and a manufacturing method thereof.
[0002]
[Prior art]
In recent years, in an optical pickup device, in order to achieve a reduction in size and weight of the device, means for integrating each component has been introduced. As an example, for example, disclosed in Japanese Patent Application Laid-Open No. 10-143934. "Magnetic optical pickup apparatus" (hereinafter, this apparatus is referred to as a first configuration example), and "Optical pickup apparatus and optical recording medium driving apparatus including the same" disclosed in JP-A-10-241186 (hereinafter, this apparatus is referred to as "No. 1"). 2 configuration examples) are known.
[0003]
Here, FIG. 8 is a side view showing the magneto-optical pickup apparatus according to the first configuration example.
[0004]
As shown in FIG. 8, the magneto-optical pickup device of the first configuration example includes a laser diode 81 serving as a light beam radiation source, photodiodes 82 and 83 for detecting error signals, in a housing 80. A silicon substrate 86 having a photodiode 84 for information signal detection and a photodiode 85 for monitoring formed on the surface is disposed, and an opening of the housing 80 is sealed with a glass cover 87 having a hologram element 87a. A composite prism 90 in which a polarizing prism 88 including a polarization separation film 88 a that makes light reflectance and light transmittance different between P-polarized light and S-polarized light and a Wollaston prism 89 is integrated is disposed on the 87. An objective lens 91 is arranged on the top. A magneto-optical disk 92 is mounted and disposed at a position facing the objective lens 91.
[0005]
In the magneto-optical pickup apparatus of the first configuration example, a plurality of light receiving elements, that is, error signal detecting photodiodes 82 and 83 and an information signal detecting photo are provided on the surface of a silicon substrate 86 disposed in the housing 80. The diode 84 and the monitoring photodiode 85 are formed and arranged on the same plane, and the optical path of the light beam is branched and divided using the polarizing prism 88 and the hologram element 87a in each of the photodiodes 82 to 85. Thus, the necessary light beams are incident on the respective photodiodes 82 to 85.
[0006]
FIGS. 9A and 9B show an optical pickup apparatus according to the second configuration example and a light projecting / receiving unit in an optical recording medium driving apparatus having the optical pickup apparatus, and FIG. 9A is an exploded perspective view thereof. (B) is the external appearance perspective view.
[0007]
As shown in FIG. 9A, this light projecting / receiving unit (synonymous with light receiving / emitting unit) includes three frames 101 to 103 including an upper frame 101, a main frame 102, and a lower frame 103. In the upper frame 101, a first photodiode (first light receiving element) 104 is disposed on a hollow support surface 101a, and in the main frame 102, a semiconductor laser element (light emitting element) 105 is transmitted on a hollow support surface 102a. A three-part diffraction grating 106, a transmissive hologram element 107, an upper reflection mirror 108, and a lower reflection mirror 109 are arranged, and the lower frame 103 has a second photodiode (second light receiving element) on the same concave support surface 103a. ) 110 is arranged.
[0008]
After the position adjustment of each of these three frames 101 to 103, the lower surface of the upper frame 101 (the non-formation side of the support surface 101a) is formed on the upper surface of the main frame 102 (the formation side of the support surface 102a). The upper surface (the side on which the support surface 103a is formed) of the lower frame 103 is adhered and fixed to the lower surface (the side on which the support surface 102a is not formed) of the main frame 102, and as shown in FIG. Through 103 are integrated to form a light projecting / receiving unit.
[0009]
[Problems to be solved by the invention]
In general, an optical pickup device is equipped with two or more light receiving elements, and the number of light receiving elements to be mounted to increase the control function tends to increase. When the number of light receiving elements mounted in the optical pickup device increases and the degree of integration of the light receiving elements increases, a phenomenon in which a part of the light beam incident on the other light receiving elements enters each light receiving element, that is, stray light Will occur.
[0010]
By the way, in the magneto-optical pickup apparatus according to the first configuration example, the monitoring photodiode 85 is arranged in the same plane together with the error signal detecting photodiodes 82 and 83 and the information signal detecting photodiode 84. It is arranged to be in. In such an arrangement, the photodiodes 82 to 85 have their light receiving surfaces in the same direction, so that it becomes easy to pick up unnecessary stray light. When the photodiode 85 for controlling the light quantity is included in these photodiodes, it becomes difficult to increase the accuracy of the light quantity control due to the generation of the stray light.
[0011]
In order to avoid the occurrence of such stray light, when attaching a light quantity control photodiode 85, an attachment position where stray light does not enter the light quantity control photodiode 85 is selected, or a light quantity control photo is provided. The attachment surface of the diode 85 may be devised, for example, by inclining the attachment surface of the other photodiodes 82 to 84 by a predetermined angle (right angle, etc.). Compared with the work when installing multiple photodiodes, the efficiency is significantly reduced.
[0012]
The light projecting / receiving unit according to the second configuration example is configured such that when a plurality of photodiodes (light receiving elements) 104 and 110 are attached, their light receiving surfaces are directed in different directions. In order to make the light receiving surfaces of the plurality of photodiodes 104 and 110 face in different directions, the upper frame 101 and the lower frame 103 are used in addition to the main frame 102, and the upper frame is arranged in the thickness direction of the light projecting / receiving unit. 101, the main frame 102, and the lower frame 103 are pasted together. When the upper frame 101, the main frame 102, and the lower frame 103 are stacked in three stages, the thickness of the light projecting / receiving unit increases, making it difficult to form a small optical pickup device by integration.
[0013]
When it is desired to increase the number of photodiodes to be used, that is, when another photodiode is used in addition to the first photodiode 104 and the second photodiode 110, the three frames 101 to 103 are used. In addition, it is necessary to use another frame, and as a result, the thickness of the light projecting / receiving unit is increased, and the thickness of the optical pickup device is increased.
[0014]
In addition, the optical pickup apparatus according to the first configuration example and the second configuration example supplies an output signal extracted from each light receiving element to one signal processing board when the optical pickup is driven. The output signals derived from the light receiving elements need to be supplied to a group of lines arranged side by side using a film-like circuit board or the like. In such a configuration, an optical pickup device is assembled, Until the output signal derived from the element is supplied to the signal processing circuit board via the film-like circuit board, the state of the electrical characteristics of the optical pickup apparatus cannot be grasped. When the state of the optical characteristics is not preferable, the arrangement location of each light receiving element must be adjusted.
[0015]
Further, in each optical pickup device according to the first configuration example and the second configuration example, when the optical pickup device is assembled, a positional deviation occurs between the reference surface of the optical pickup device and the reference surface of the light projecting / receiving unit. The output signal of the light receiving element may change due to the influence of the positional deviation. Further, in the case of the type in which the light beam is shaped by the shaping prism attached to the outside of the housing in the first structural example or the light projecting / receiving unit in the second structural example, the housing in the first structural example, Alternatively, the incident light intensity distribution on the light receiving element in the light projecting / receiving unit in the second configuration example may change due to the influence of the shaping prism arrangement error, which may cause a change in the output signal of the light receiving element. become.
[0016]
The present invention has been made in view of such a technical background, and an object of the present invention is to arrange a plurality of light receiving elements without increasing the thickness thereof so that their light receiving surfaces face in different directions. An object of the present invention is to provide a light emitting / receiving unit capable of grasping the immediately preceding characteristic and increasing the degree of integration of each component and a method for manufacturing the same.
[0017]
[Means for Solving the Problems]
In order to achieve the above object, a light receiving and emitting unit according to the present invention includes at least a light source that emits a light beam, one or more light beam branching means for branching the light beam, and one that changes the optical path of the light beam. Install the above optical path changing means in the recesses. And having a plurality of light beam exits A first holding plate and a second holding plate are provided on the surface of the first optical component mounting portion, two or more first holding plates to which the light receiving elements are attached, and one or more second holding plates to which the light receiving elements are not attached. And a second optical component mounting portion on which a film-like circuit board is attached so that the joint portion of the plate can be bent, and a light source is provided on the film-like circuit board. Land group And a light receiving element provided on the connection portion on the same plane as the light receiving surface and the film-like circuit board. Land group And the first holding plates are connected to each other so that the light receiving surfaces of the light receiving elements attached to two or more first holding plates are directed in different directions from the light receiving surfaces of the other light receiving elements. A part of the circuit board is bent, and the light beam branched from one of the one or more light beam branching means is bent directly or by one or more of the optical path changing means and enters the corresponding light receiving element. So as to interleave In addition, at least one set of the light receiving element and the land group conductively connected to the light receiving element falls within the aperture of the light beam exit. And a means configured to attach the first holding plate and the second holding plate of the second optical component mounting portion to the first optical component mounting portion.
[0018]
According to the above means, the first optical component mounting portion on which various optical components excluding the light receiving element are mounted, the two or more first holding plates to which the light receiving element is bonded, and one or more not to be bonded to the light receiving element. A film-like circuit board is affixed to the surface of the second holding plate, and the first holding plate and the second optical component mounting portion configured so that the joint portion of the second holding plate can be bent, are used. When adhering the optical component mounting part and the second optical component mounting part, the light source was first conductively connected to the land provided on the film-like circuit board, and then adhered to two or more first holding plates. Each first holding plate is bent so that the light receiving surface of the light receiving element faces a different direction from the light receiving surfaces of the other light receiving elements, and then the light beam branched from one of the one or more light beam branching means is directly or directly One of the one or more optical path changing means is bent and incident on the corresponding light receiving element Sea urchin and mutual arrangement, the first holding plate and a second holding plate of the second optical component mounting unit so as to adhere to the first optical component mounting portion in this state At this time, at least one set of the light receiving element disposed on the second holding plate and the land group conductively connected to the light receiving element is configured to enter the aperture of the light beam emitting port provided in the first optical component mounting portion. Have Therefore, a plurality of light receiving elements can be arranged at a position most suitable for each light receiving element on a plurality of different arrangement surfaces. In addition, the adhesiveness between the second holding plate and the first optical component mounting portion at the time of sticking is increased, and the size can be reduced. Even if the number of light receiving elements used increases, the light receiving and emitting units can be appropriately arranged in a preferable state without increasing the thickness of the light receiving and emitting units. This prevents high efficiency due to sticking of each light receiving element and conductive connection when they are not arranged on the same plane, and the electrical characteristics of the output signal from the light receiving element are in the same state as when the optical pickup device is assembled. Can be grasped.
[0021]
Further, the first optical component mounting portion in the means has two or more openings that lead out the light beam emitted from the light source from the first optical component mounting portion, One opening is Sealed by means of collimating the light beam, In addition, the other opening is sealed by the close contact between the first optical component mounting portion and the first holding plate and the second holding plate. It is what I did.
[0022]
With such a configuration, it is possible to eliminate the change in the incident state of the light beam on the light receiving element due to the arrangement error between the collimator lens and the light source, and the inside of the first optical component mounting portion can be completely removed. It can be sealed.
[0023]
Further, the first optical component mounting portion in the means has two or more openings for guiding the light beam emitted from the light source from the first optical component mounting portion, One opening is By means for collimating the light beam and means for shaping the light beam Double sealing is performed, and the other openings are sealed by tightly sealing between the first optical component mounting portion and the first holding plate and the second holding plate. It is what I did.
[0024]
With such a configuration, the position of the light receiving element is adjusted after the collimator lens or shaping prism for performing light beam shaping is mounted in advance, so that it is reflected again by the optical medium or the like when it is emitted from the collimator lens. Therefore, it is possible to integrate a shaping prism that causes a change in the shape of the light beam and to make each light receiving element function optimally. It is also possible to completely seal the inside of the light emitting / receiving unit with a collimator lens or a shaping prism.
[0025]
Further, the first optical component mounting portion and the second optical component mounting portion in the means are formed with a cylindrical positioning concave portion on one of the sticking surfaces and a cylindrical convex portion having a smaller diameter than the concave portion on the other. It is what.
[0026]
With such a configuration, since the concave portion is formed on one of the first optical component mounting portion and the second optical component mounting portion, and the convex portion is formed on the other, the initial position when the position of the light receiving element is adjusted. Setting is easy.
[0027]
Further, the means The light receiving / emitting unit is used to focus the light beam emitted from the light source on the optical recording medium on the first optical component mounting portion, and shift the light focusing means in the radial direction of the optical recording medium. An optical pickup is configured by arranging a driving means, and a mirror portion serving as a reference for the driving means is formed on an extended surface of the first optical component mounting portion parallel to the light source mounting surface. Is.
[0028]
With such a configuration, the first optical component mounting portion serves as a reference for the driving means for moving the light collecting means in the radial direction of the optical recording medium. The adjustment can be made on the basis of one surface, and the incorporation accuracy of the light collecting means can be improved.
[0029]
In addition, the means Of the light emitting / receiving unit In the manufacturing method, When the opening of the first optical component mounting portion is sealed by the second optical component mounting portion, the following processing procedure is performed, and a corresponding portion of the second optical component mounting portion is temporarily placed in each opening of the first optical component mounting portion. A step of adhering, a step of adhering a part of the film-like circuit board of the second optical component mounting part to a corresponding part of the first optical component attaching part, and a light source and all light receiving elements provided on the film-like circuit board A continuous conductive connection to the land, a step of mutually adjusting the positions of all the light receiving elements and the projection position of the light beam to those light receiving elements, and a second optical element at the opening of the first optical component mounting portion. The light emitting / receiving unit is obtained through the process of completely attaching the component mounting part. .
[0032]
With such a configuration, before the first optical component mounting portion and the second optical component mounting portion are bonded, a part of the film-like circuit board of the second optical component mounting portion is attached to the first optical component mounting portion. By sticking to the corresponding portion, the light source and the light receiving element can be conductively connected to the film-like circuit board at the same time, and the conductive connection step can be performed quickly and efficiently.
[0033]
In addition, the means Of the light emitting / receiving unit In the manufacturing method, When the opening of the first optical component mounting portion is sealed by the second optical component mounting portion, the following processing procedure is performed, and a corresponding portion of the second optical component mounting portion is temporarily placed in each opening of the first optical component mounting portion. A step of adhering, a step of adhering a part of the film-like circuit board of the second optical component mounting part to a corresponding part of the first optical component attaching part, and a light source and all light receiving elements provided on the film-like circuit board Continuously conducting conductive connection to the land, driving the light source, reflecting the light beam emitted from the light source with an external light reflector, and observing the condensing position of the reflected light beam at that time The light receiving / emitting unit is obtained through the steps of adjusting and fixing the arrangement position of the corresponding light beam branching means and the step of completely attaching the second optical component mounting portion to the opening of the first optical component mounting portion. Is.
[0034]
With such a configuration, after the light source is conductively connected to the film-like circuit board, the position of the light beam branching unit is adjusted while the light source emits light, so that the light beam branching unit branches the light beam. The error of the incident position of the light beam in the focal direction can be reduced.
[0035]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0036]
FIG. 1 is a perspective view showing a main configuration of a first optical component mounting portion according to the first embodiment of the light receiving and emitting unit according to the present invention.
[0037]
As shown in FIG. 1, the first optical component mounting portion 1 includes a concave portion 1a formed so that various optical components can be mounted, a light source 2 that emits a light beam, and a light beam splitter that branches the light beam. (Light beam branching means) 3, a light beam diffraction element 4, and a surface reflection type 45-degree mirror (light path changing means) 5 for bending and changing the optical path of the light beam. Both the beam diffraction element 4 and the surface reflection type 45-degree mirror 5 are mounted in the recess 1 a of the first optical component mounting unit 1. Further, the optical component arranging member 1 has a first light beam exit port 6 on the front wall portion of the recess 1a, a second light beam exit port 7 on one side wall portion of the recess 1a, and a second side wall portion of the recess 1a. A third light beam exit 8 is provided.
[0038]
In this case, the first light beam exit port 6 is an exit port that emits the light beam LA emitted from the light source 2 to the outside from the first optical component mounting portion 1 in a straight traveling state, and the second light beam exit port 7 is , An exit through which the light beam LB obtained by bending and reflecting the light beam LA emitted from the light source 2 in the direction perpendicular to the light beam splitter 3 is emitted from the first optical component mounting portion 1 to the outside. In the light beam exit 8, the light beam LA emitted from the first light beam exit 6 is reflected by a reflection object (for example, an optical disc) outside the optical pickup device, and the reflected light beam returns to the light beam splitter 3. This is an exit through which the light beam LC obtained by bending and reflecting in the perpendicular direction again is emitted from the first optical component mounting portion 1 to the outside. Further, when the light beam LA emitted from the light source 2 is reflected by a reflection object outside the optical pickup device and the reflected light beam returns to the light beam diffraction element 4, a part of the reflected light beam is subjected to light beam diffraction. The light is diffracted by the element 4 and travels toward the surface reflection type 45 degree mirror 5 as a diffracted light beam. The diffracted light beam is reflected again by the surface reflection type 45-degree mirror 5 and projected as a light beam LD in the height direction (y direction) of the first optical component mounting portion 1.
[0039]
In the first optical component mounting portion 1, an example in which the light beam splitter 3 is used as the light beam branching unit and the surface reflection type 45-degree mirror 5 is used as the optical path changing unit is shown. Instead of the light beam splitter 3, means capable of achieving an equivalent function may be adopted, and means capable of achieving an equivalent function instead of the surface reflection type 45 degree mirror 5 may be adopted as an optical path changing means.
[0040]
In addition, the light beam splitter 3 as a light beam branching means is a polarization beam splitter having a characteristic in which the light transmittance and the light reflectance differ depending on the type of polarization, or a polarization separation formed of a birefringent material on the polarization beam splitter. It may be a composite optical element in which the elements are combined. Similarly, the light beam diffractive element 4 which is a light beam branching unit may be a light beam diffractive element to which a function of dividing the incident light beam into a plurality of parts, a function of converting the divergence angle of the incident light beam, and the like are added. Good. Furthermore, an internal reflection type 45 degree mirror may be used as the surface reflection type 45 degree mirror 5 which is an optical path changing means.
[0041]
Next, FIG. 2 is a perspective view showing the configuration of the main part of the second optical component mounting portion according to the first embodiment of the light emitting and receiving unit according to the present invention, and the first optical component mounting shown in FIG. It is affixed to the part 1.
[0042]
As shown in FIG. 2, the second optical component mounting portion 9 includes three first holding plates 10, 11, 12, one second holding plate 13, and three first holding plates 10 to 10. 12 and a film-like circuit board 14 attached to each surface of one second holding plate 13, a light-receiving element 10a attached to the film-like circuit board 14 attachment surface side of the first holding plate 10, A light receiving element 11a attached to the film holding circuit board 14 attachment surface side of the first holding plate 11, a light receiving element 12a attached to the film holding circuit board 14 attachment surface side of the first holding plate 12, and Is provided. The film-like circuit board 14 is provided with land groups 15, 16, 17, and 18 at a plurality of locations on the surface, and the land groups 15 to 18 are respectively formed by wiring groups (not shown) formed on the film-like circuit board 14. It is connected to a corresponding drive circuit or the like.
[0043]
In this case, the land group 15 has eight land parts (no figure number), the land group 16 has six land parts (no figure number), and the land group 17 has three land parts (no figure number). The land group 18 has two land portions (no figure number). In the light receiving element 10a, corresponding portions of the light receiving surface are conductively connected to eight land portions by a fine metal wire group (not shown), respectively. The light receiving element 10b has six corresponding land locations on the light receiving surface. The light receiving element 10c is electrically conductively connected to the three land portions by a fine metal wire group (no figure number), respectively. Is done. A gold wire or an aluminum / silicon alloy wire is used as the fine metal wire at this time.
[0044]
In addition, when the film-like circuit board 14 is attached to each surface of the three first holding plates 10 to 12 and the one second holding plate 13, the joint portion of the first holding plates 10 and 11, the first holding The second optical component mounting portion 9 is attached to the first optical component mounting portion of the first optical component mounting portion 9 so as to be attached to the bonding portion of the plates 10 and 12 and the bonding portion of the first holding plate 10 and the second holding plate 13 respectively. 1, the first holding plate 11, the first holding plate 12, and the second holding plate 13 can be bent about 90 ° with respect to the first holding plate 10.
[0045]
The second optical component mounting portion 9 is a light receiving element. 11a The size of the portion including the land group 16 is smaller than the diameter of the second light beam emitting port 7 formed in the first optical component mounting portion 1, and similarly, the light receiving element 12a The size of the portion including the land group 17 is configured to be smaller than the diameter of the third light beam emission port 8 formed in the first optical component mounting portion 1. The reason for this configuration is that, as will be described later, when the second optical component mounting portion 9 is attached to the first optical component mounting portion 1, the light receiving element 11a And the land group 16 are within the diameter of the second light beam exit 7 and the light receiving element. 12a And the land group 17 are included in the diameter of the third light beam emission port 8 so that the first holding plates 11 and 12 of the second optical component mounting unit 9 are connected to the first optical component mounting unit 1. This is because it can be bonded to the corresponding side surface without any gap.
[0046]
In the second optical component mounting portion 9, the light receiving element 10a The first holding plate 10 with the light attached, the light receiving element 11a The first holding plate 11 with the light attached, the light receiving element 12a Since the 1st holding plate 12 which stuck is has a mutually sticking surface, each light receiving element 10a, 11a, 12a The operability at the time of conducting conductive connection to the film-like circuit board 14 is improved. That is, the light receiving / emitting unit according to this embodiment includes each light receiving element. 10a, 11a, 12a Each light receiving element 10a, 11a, 12a Are in the same plane and suitable for conductive connection. 10a, 11a, 12a When adjusting the position of each light receiving element 10a, 11a, 12a Can be changed to a state suitable for position adjustment and fixing, so that the light receiving / emitting unit design and each light receiving element 10a, 11a, 12a The operability at the time of conductive connection can be individually improved.
[0047]
In the example shown in FIG. 2, no components are mounted on the second holding plate 13, but a semiconductor laser is used as the light source 2 for the film-like circuit board 14 on the second holding plate 13. A high frequency generating circuit unit for superimposing a high frequency on a DC power source for driving the light source 2 can be mounted.
[0048]
Further, in the example shown in FIG. 2, the first holding plate 10 is attached to the film-like circuit board 14 attached to the surfaces of the three first holding plates 10 to 12 and the one second holding plate 13. The first holding plate 11, the first holding plate 12, and the second holding plate 13 are not provided at the joint portions between the first holding plate 10 and the other holding plates 11, 12, and 13. In order to improve the flexibility when each of the first and second holding plates 10 and 12 is bent, each of the joint portions between the first holding plate 10 and the other holding plates 11, 12, and 13 has a long elliptical opening extending along the joint portion. A portion may be provided.
[0049]
3 and 4 are perspective views showing a manufacturing process when the first optical component mounting portion 1 and the second optical component mounting portion 9 are bonded to form a light emitting / receiving unit. Represents the initial state, and FIG. 4 represents the final state.
[0050]
3 and 4, 19 is a cylindrical convex portion provided in the first optical component mounting portion 1, 20 is a cylindrical concave portion provided in the first holding plate 10 of the second optical component mounting portion 9, The same components as those shown in FIGS. 1 and 2 are denoted by the same reference numerals.
[0051]
In this case, the cylindrical convex portion 19 and the cylindrical concave portion 20 are for positioning to an adjustment start position (a predetermined position at the time of designing the light receiving element), and the diameter of the cylindrical convex portion 19 is the cylindrical concave portion 20. It is formed to be smaller than the diameter.
[0052]
Here, the manufacturing process of this light emitting / receiving unit will be described with reference to FIGS.
[0053]
First, as shown in FIG. 3, the second holding plate 13 of the second optical component mounting portion 9 shown in FIG. 2 is brought into contact with the back surface of the first optical component mounting portion 1 shown in FIG. The film-like circuit board 14 extending outward from the second holding plate 13 is bent along the back surface of the first optical component mounting portion 1, and the protruding portion where the land group 18 is formed is the first portion. It sticks in the vicinity of the arrangement | positioning part of the light source 2 in the recessed part 1a of the optical component mounting part 1. FIG.
[0054]
Next, the light source 2 and the corresponding land portion of the land group 18 are conductively connected by a metal wire (not shown).
[0055]
Next, in a state where the light source 2 and the corresponding land portion of the land group 18 are conductively connected, the joint portion of the first holding plates 10 and 11, the joint portion of the first holding plates 10 and 12, The joint portions of the first holding plate 10 and the second holding plate 13 are bent by approximately 90 °, and the second holding plate 13 is formed on the back surface of the first optical component mounting portion 1 and the second optical plate mounting portion 1 is provided on both side surfaces of the first optical component mounting portion 1 The first holding plates 11 and 12 are placed on the first optical component mounting portion 1 so that the second optical component mounting portion 9 is folded so that the first holding plate 10 comes to the upper surface of the first optical component mounting portion 1, respectively. . At this time, the first optical component is fitted by fitting the cylindrical convex portion 19 provided on the first optical component mounting portion 1 into the cylindrical concave portion 20 provided on the first holding plate 10 of the second optical component mounting portion 9. The mounting portion 1 and the first holding plate 10 are positioned to the adjustment start position.
[0056]
Subsequently, as shown in FIG. 4, the light receiving / emitting unit is temporarily formed by covering the second optical component mounting portion 9 folded on the first optical component mounting portion 1, and then the light source 2 is caused to emit light and position adjustment is required. The position of the light receiving element 10a and the like is adjusted. In this adjustment, for example, when the position of the light receiving element 10a on the first holding plate 10 needs to be adjusted, the tip engages with a concave portion or a convex portion (not shown) provided on the first holding plate 10. The light receiving element 10a is moved for each first holding plate 10 using a dedicated arm (not shown), and a predetermined signal output from the light receiving element 10a is obtained via the film-like circuit board 14. The position of the light receiving element 10a is adjusted. Similarly, the positions of the other light receiving elements 11a and 12a are adjusted. When the adjustment of the positions of these light receiving elements 10a, 11a, and 12a is completed, the second optical component mounting portion 9 is attached to the first optical component mounting portion 1 so as to seal the inside of the first optical component mounting portion 1. Fix and complete the light emitting / receiving unit.
[0057]
The light receiving / emitting unit obtained in this way has the first holding plates 11 and 12 and the second holding plate 13 of the second optical component mounting portion 9, the first optical component mounting portion 1 and the second optical component mounting portion 9. Are arranged on the side surface side of the first optical component mounting portion 1, so that the light receiving surfaces of the light receiving elements 10 a, 11 a, and 12 a can be integrated so as to face different directions, respectively, The thickness (thickness in the Y direction in FIG. 3) is within the range of the sum of the thickness of the first optical component mounting portion 1 and the thickness of the first holding plate 10, and without increasing the thickness of the light receiving and emitting unit, The degree of integration can be increased. In this case, the state of the signal obtained from each light receiving element 10a, 11a, 12a in the state where the light emitting / receiving unit is temporarily formed is changed to an optical pickup device (for example, the simplest one is the light receiving / emitting unit and the same light receiving / emitting unit). Can be grasped as the same signal state as when assembled, and the performance of the light emitting / receiving unit alone can be grasped. it can.
[0058]
Further, the manufacturing method of this light emitting / receiving unit will be described. A part of the film-like circuit board 14 of the second optical component mounting portion 9, that is, a protruding portion where the land group 18 is formed with respect to the first optical component mounting portion 1. Is attached to the recess 1a, and then the conductive connection is continuously made between the light source 2, each light receiving element 10a, 11a, 12a and each land group 15, 15, 17, 18 provided on the film-like circuit board 14. For example, the conductive connection process can be performed quickly and efficiently.
[0059]
Also, for example, when the beam splitter 3 is mounted and fixed in the light beam branching unit mounted on the first optical component mounting unit 1, the light source 2 is caused to emit light in the process after conducting the conductive connection of the light source 2. The radiated light is projected onto a reflective object (such as an optical disk) outside the light emitting / receiving unit, a reflected light beam returned from the reflective object is used, and the beam splitter 3 is parallel to the optical axis of the radiated light beam from the light source 2. By adjusting and fixing the position in the (Z direction), it is possible to improve the defocus error when the light beam branched in the direction of the light receiving element 13a enters the light receiving surface of the light receiving element 13a. If a corner reflector is used as an external reflecting object, the position adjustment of the beam splitter 3 can be easily performed regardless of whether the emitted light beam is a parallel light beam or a focused light beam.
[0060]
In this embodiment, the first optical component mounting part 1 is provided with a cylindrical convex part 19, and the first holding plate 10 of the second optical component mounting part 9 is provided with a cylindrical concave part 20. Conversely, the cylindrical recess 20 may be provided in the first optical component mounting portion 1, and the cylindrical protrusion 19 may be provided in the first holding plate 10 of the second optical component mounting portion 9. Further, when the positioning accuracy between the first optical component mounting portion 1 and the first holding plate 10 may be relatively rough, the provision of the cylindrical convex portion 19 and the provision of the cylindrical concave portion 20 are omitted. You may do it.
[0061]
FIG. 5 is a perspective view showing a main part configuration of the first optical component mounting portion 1 according to the second embodiment of the light emitting / receiving unit according to the present invention.
[0062]
As shown in FIG. 5, the first optical component mounting portion 1 according to the second embodiment is a first light beam in the first optical component mounting portion 1 of the first embodiment shown in FIG. A collimator lens 21 for converting the emitted light beam into a parallel light beam is fitted into the emission port 6, and the other configuration is the same as that of the first optical component mounting portion 1 of the first embodiment. In FIG. 5, the same components as those shown in FIG.
[0063]
In the case where the collimator lens is integrated with the light emitting / receiving unit, a deviation from the design value of the positional relationship between the collimator lens 21 and the light source 2 becomes a problem. In the second embodiment, the influence of the deviation is affected. The light emitting / receiving unit can be configured in such a way that it does not come out.
[0064]
In the first optical component mounting portion 1 according to the second embodiment, after the collimator lens 21 is fitted into the first light beam exit 6, the first optical component mounting portion 1 and the second optical component as described above are used. The mounting portion 9 is attached to constitute a light emitting / receiving unit. For example, an error caused by a deviation from the design value of the positional relationship between the collimator lens 21 and the light source 2 is absorbed, and the exit of the opening portion 8 is absorbed. The operation of bringing the focal position of the light back to the position, that is, the position of the beam splitter 3 is adjusted and fixed to complete the first optical component mounting portion 1, and the position in each of the light receiving elements 10a, 11a, 12a. The light receiving element that needs to be adjusted can also be adjusted in position and fixed so as to absorb the influence of deviation from the design value of the positional relationship between the collimator lens 21 and the light source 2. The inside of the light receiving / emitting unit can be sealed by the collimator lens 21.
[0065]
Next, FIG. 6 is a perspective view showing a main part configuration of the first optical component mounting portion 1 according to the third embodiment of the light emitting and receiving unit according to the present invention.
[0066]
As shown in FIG. 6, the first optical component mounting portion 1 according to the third embodiment is the entire first optical component mounting portion 1 when viewed from the height direction (Y-axis direction in the figure). The projection shape is a trapezoid, and a collimator lens 21 for converting the emitted light beam into a parallel light beam is fitted into the first light beam exit port 6 of the first optical component mounting portion 1 to mount the first optical component. The shaping prism 22 is attached to the first light beam exit 6 at the inclined portion of the portion 1, and the other configuration is the same as that of the first optical component mounting portion 1 of the first embodiment. In FIG. 6, the same components as those shown in FIG.
[0067]
In the first optical component mounting unit 1 according to the third embodiment, the inclination angle θ of the trapezoid hypotenuse and the shape of the shaping prism 22 are the glass material and shaping ratio of the shaping prism 22 and the light beam emitted from the light source 2. It depends on the wavelength. For example, when the wavelength of the light beam emitted from the light source 2 is 405 nm, the angle formed by the two surfaces is a right angle, and the shaping prism 22 processed with the glass material BK7 and having a shaping ratio of 1.5 times is used, FIG. Is 23.1 °, and the apex angle φ of the shaping prism 22 is 32.8 °.
[0068]
In the light receiving / emitting unit according to the third embodiment, after the collimator lens 21 and the shaping prism 22 are fixed to the first optical component mounting portion 1, the second optical component mounting portion 9 is attached to the first optical component mounting portion 1. A shaping prism that changes the light beam shape between when the light emitted from the light source 2 is emitted from the collimator lens 21 and when the light is reflected by the optical medium and returned again. Even if 22 is integrated, the position of the light receiving element that needs to be adjusted in each of the light receiving elements 10a, 11a, and 12a can be fixed by performing position adjustment reflecting the change in the light beam shape. The interior of the light emitting / receiving unit can be sealed with the collimator lens 21 and the shaping prism 22.
[0069]
Next, FIG. 7 relates to a fourth embodiment of the light emitting / receiving unit according to the present invention, and the main part of the pickup device in which the light emitting / receiving unit and the light collecting means for the emitted light from the light emitting / receiving unit are combined. It is a perspective view which shows a structure.
[0070]
As shown in FIG. 7, the optical pickup device using the light emitting / receiving unit according to the fourth embodiment has the same components as the light emitting / receiving unit shown in FIG. A surface reflection type 45 degree mirror 23 as an optical path changing means, an objective lens 24 as a condensing means for converging a light beam on the surface of the optical disk 27, and a driving means 25 for driving the objective lens 24 (only a part is shown) And). In FIG. 7, the same components as those shown in FIG.
[0071]
The light emitting / receiving unit according to the fourth embodiment is obtained by partially changing the shape of the first optical component mounting portion 1 in the light receiving / emitting unit according to the second embodiment. A projecting surface 26 parallel to the mounting surface of the extended light source 2 is provided, and the driving means 25 for driving the objective lens 24 is assembled on the projecting surface 26 with the projecting surface 26 as a reference.
[0072]
In this case, the driving means 25 for driving the objective lens 24 is assembled so that the objective lens 24 is parallel to the reference plane of the optical pickup device. The driving means 25 for driving the objective lens 24 focused on the surface can be incorporated into the light emitting / receiving unit with high accuracy.
[0073]
In each of the above embodiments, the first optical component mounting portion 9 has been described with an example in which the first holding plates 10, 11, 12 and the second holding plate 13 are formed. The first optical component mounting portion 9 according to the present invention is not limited to being formed by three first holding plates 10, 11, 12 and one second holding plate 13, but two or four. The first holding plate may be provided, or two or more second holding plates may be provided.
[0074]
【The invention's effect】
As described above, according to the light receiving and emitting unit according to the present invention, the first optical component mounting portion on which various optical components excluding the light receiving element are mounted, the two or more first holding plates to which the light receiving elements are attached, A second optical circuit configured such that a film-like circuit board is attached to the surface of one or more second holding plates to which a light receiving element is not attached, and a joint portion between the first holding plate and the second holding plate can be bent. When attaching the first optical component mounting portion and the second optical component mounting portion using the component mounting portion, the light source is first conductively connected to the land provided on the film-like circuit board, and then two or more Each of the first holding plates is bent so that the light receiving surface of the light receiving element attached to the first holding plate faces a different direction from the light receiving surfaces of the other light receiving elements, and then one of the one or more light beam branching means The light beam branched from is bent either directly or by one or more optical path changing means Is by mutual arrangement to be incident of the corresponding light receiving element, the first holding plate and a second holding plate of the second optical component mounting unit so as to adhere to the first optical component mounting portion in this state At this time, at least one set of the light receiving element disposed on the second holding plate and the land group conductively connected to the light receiving element is configured to enter the aperture of the light beam emitting port provided in the first optical component mounting portion. Have Therefore, a plurality of light receiving elements can be arranged at a position most suitable for each light receiving element on a plurality of different arrangement surfaces. In addition, the adhesiveness between the second holding plate and the first optical component mounting portion at the time of sticking is increased, and the size can be reduced. Even if the number of light receiving elements used increases, the light receiving and emitting units can be appropriately arranged in a preferable state without increasing the thickness of the light receiving and emitting units. This prevents high efficiency due to sticking of each light receiving element and conductive connection when they are not arranged on the same plane, and the electrical characteristics of the output signal from the light receiving element are in the same state as when the optical pickup device is assembled. There is an effect that it becomes possible to grasp.
[0075]
Further, according to the method for manufacturing the light receiving / emitting unit according to the present invention, the influence of the variation in the incident position of the light beam on each light receiving element based on the variation in the arrangement state of the optical components constituting the light receiving / emitting unit is detected. Light beam incident state that can be eliminated at the time of adjustment or creation of the first optical component mounting portion, and the shape of the incident light beam to the light receiving element changes as in the case where the shaping prism is integrated with the light receiving / emitting unit There is an effect that it is possible to manufacture a light emitting and receiving unit that reflects changes in advance.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a configuration of a main part of a first optical component mounting portion according to a first embodiment of a light receiving and emitting unit according to the present invention.
FIG. 2 is a perspective view showing a configuration of a main part of a second optical component mounting portion according to the first embodiment of the light receiving and emitting unit according to the present invention.
FIG. 3 is a perspective view showing an initial state of a manufacturing process when a light receiving and emitting unit is formed by attaching a first optical component mounting portion and a second optical component mounting portion.
FIG. 4 is a perspective view showing a state immediately before the end of the manufacturing process when the first optical component mounting portion and the second optical component mounting portion are bonded to form a light receiving and emitting unit.
FIG. 5 is a perspective view showing a main configuration of a first optical component mounting portion according to a second embodiment of the light receiving and emitting unit according to the present invention.
FIG. 6 is a perspective view showing a main part configuration of a first optical component mounting portion according to a third embodiment of the light receiving and emitting unit according to the present invention.
FIG. 7 is a perspective view showing a configuration of a main part of an optical pickup device using the light emitting / receiving unit according to a fourth embodiment of the light receiving / emitting unit according to the present invention.
FIG. 8 is a side view showing a magneto-optical pickup apparatus according to a known first configuration example.
FIG. 9 is a configuration diagram showing an optical pickup device according to a known second configuration example and a light projecting / receiving unit in an optical recording medium driving device including the same.
[Explanation of symbols]
1 First optical component mounting part
1a recess
2 Light source
3 Light beam splitter (light beam branching means)
4 Light beam diffraction element
5, 23 Surface reflection type 45 degree mirror (light path changing means)
6 First light beam exit
7 Second light beam exit
8 Third light beam exit
9 Second optical component mounting part
10, 11, 12 First holding plate
10a, 11a, 12a Light receiving element
13 Second holding plate
14 Film-like circuit board
15, 16, 17, 18 Land group
19 Cylindrical convex part
20 Cylindrical recess
21 Collimator lens
22 Shaping prism
24 Objective lens
25 Drive means
26 Protruding surface
27 Optical disc

Claims

At least a light source that emits a light beam, one or more light beam branching means for branching the light beam, and one or more optical path changing means for bending and changing the optical path of the light beam are mounted in the recess, respectively , On the surface of the first optical component mounting portion having the light beam exit port, the two or more first holding plates to which the light receiving elements are attached, and the one or more second holding plates to which the light receiving elements are not attached. A second optical component mounting portion on which a film-like circuit board is bonded so that a joint portion between the first holding plate and the second holding plate can be bent, and the light source is electrically connected to a land group provided on the film-like circuit board. The light receiving element is connected and conductively connected between a connection portion on the same surface as the light receiving surface and a land group provided on the film-like circuit board, and received by the light receiving elements attached to the two or more first holding plates. The surface is different from the light receiving surface of other light receiving elements. As described above, a part of the film-like circuit board connecting the first holding plates to each other is bent, and the light beam branched from any one of the one or more light beam branching means is directly or the one or more Are arranged so that they are bent by one of the optical path changing means and incident on the corresponding light receiving element , and at least one set of the land group electrically connected to the light receiving element is connected to the light beam emitting port. A light emitting / receiving unit characterized in that the first holding plate and the second holding plate of the second optical component mounting portion are attached to the first optical component mounting portion in a state of entering the aperture. .

The first optical component mounting portion has two or more openings for guiding a light beam emitted from the light source from the first optical component mounting portion, and one of the openings is the light. The other opening is sealed by means of close contact between the first optical component mounting part and the first holding plate and the second holding plate. The light emitting / receiving unit according to claim 1, wherein the light emitting / receiving unit is configured as described above.

The first optical component mounting portion has two or more openings for guiding a light beam emitted from the light source from the first optical component mounting portion, and one of the openings is the light. doubly sealed by means of shaping means and the light beam to a beam into parallel light, and the other opening of said first optical component mounting portion and the first holding plate and said second holding plate The light emitting and receiving unit according to claim 1 , wherein the light emitting and receiving unit is sealed by being in close contact with each other.

An optical pickup having a condensing unit that condenses a light beam emitted from the light source on an optical recording medium, and a driving unit that moves the condensing unit in a radial direction of the optical recording medium, 4. The mirror unit serving as a reference for the driving unit is formed on an extended surface of the first optical component mounting unit parallel to the mounting surface of the light source. 5. An optical pickup device using a light emitting / receiving unit.

When the opening of the first optical component mounting part according to claim 1 is sealed by the second optical component mounting part, the light receiving / emitting unit is manufactured through the following processing procedure. A step of temporarily attaching a corresponding portion of the second optical component mounting portion to each opening of the first optical component mounting portion; and a part of the film-like circuit board of the second optical component mounting portion. A step of adhering to a corresponding portion of the first optical component mounting portion, a step of continuously conductively connecting the light source and the all light receiving elements to a land provided on the film-like circuit board, and Light receiving and emitting through a step of mutually adjusting the position and the projection position of the light beam to those light receiving elements and a step of completely attaching the second optical component mounting portion to the opening of the first optical component mounting portion Unit is obtained Method for manufacturing a light emitting unit.

When sealing the opening part of the 1st optical component mounting part of any one of Claims 1 thru | or 4 by the said 2nd optical component mounting part, a light emitting / receiving unit is manufactured through the following process sequence. A method of manufacturing a light receiving and emitting unit, the step of temporarily attaching a corresponding portion of the second optical component mounting portion to each opening of the first optical component mounting portion, and a film of the second optical component mounting portion A step of adhering a part of the circuit board to a corresponding part of the first optical component mounting portion, and a step of continuously conductively connecting the light source and all the light receiving elements to a land provided on the film circuit board And a step of driving the light source, and arranging a corresponding light beam branching means while reflecting the light beam emitted from the light source with an external light reflector and observing the condensing position of the reflected light beam at that time Before adjusting and fixing the position Method of manufacturing a light receiving and emitting unit, wherein the first optical component mounting unit light receiving and emitting unit through each step of fully adhering the second optical component mounting portion in the opening is obtained.