JP2004093674A

JP2004093674A - Method and apparatus for adjusting astigmatism adjusting lens

Info

Publication number: JP2004093674A
Application number: JP2002251615A
Authority: JP
Inventors: Hiroyuki Ogawa; 小川　裕之
Original assignee: Matsushita Electric Industrial Co Ltd
Current assignee: Panasonic Holdings Corp
Priority date: 2002-08-29
Filing date: 2002-08-29
Publication date: 2004-03-25

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and an apparatus for adjusting an astigmatism adjusting lens without the need of a gate. <P>SOLUTION: The apparatus for adjusting astigmatism adjusting lens is equipped with lens holding means 102, 103, and 104 for rotatably holding the astigmatism adjusting lens 101, a parallel light ray flux irradiating means for irradiating the astigmatic adjustism lens 101a with parallel light ray flux, and a light receiving face for receiving a focal line obtained by the parallel light ray flux passing through the astigmatism adjusting lens 101. The astigmatism adjusting lens 101 is made rotatable so that the focal line coincides with a reference line 113 determined by the position of the lens holding means. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は、非点収差調整レンズを調整する方法、非点収差調整レンズ調整装置に関する。
【０００２】
【従来の技術】
図３に従来の非点収差調整レンズの調整方法を示す。従来の非点収差調整レンズの調整方法によると、まず、非点収差調整レンズ２０１を保持部２０２で保持した後、レンズ取付台２０４に固定されたレンズホルダ２０３に取り付ける。次に、前記非点収差調整レンズ２０１の両端にあるゲート２０５及び図３中の破線で囲む範囲を、紙面に垂直方向の位置に配置された２台の位置検出カメラ２０６にてモニタ２０７を使用してモニタする。前記モニタ２０７には、２台の位置検出カメラ２０６の画像が左右並んで表示されている。モニタ２０７に写されるゲート２０５のレンズホルダ２０３に対する位置が左右の画面で同じになる様に非点収差調整レンズ２０１を回転調整する方法を採用していた。
【０００３】
非点収差調整レンズ２０１を光ピックアップとして使用する場合、上記のように、非点収差調整レンズ２０１自体の設計により調整できる非点収差の方向と、光ピックアップにおける調整したい非点収差の方向を合致させる事で、双方の非点収差が相殺でき、光路全体の非点収差量が調整できる。
【０００４】
【発明が解決しようとする課題】
しかしながら、非点収差調整レンズの非点収差の方向が合致しないと、非点収差が相殺できないばかりか光ピックアップ光路全体の非点収差量を増大させる事となり、光ピックアップの性能自体を劣化させてしまう。
【０００５】
この為、非点収差調整レンズ２０１自体の非点収差の方向を高精度に調整する必要がある。
【０００６】
しかし、上記のような調整方法では、非点収差調整レンズ２０１に対して高精度に調整されたゲート２０５が必要となる。そのため、非点収差調整レンズ２０１の製造工程が複雑となり、製造コストが高かった。
【０００７】
本発明は、上記の課題を鑑み、ゲートを必要としない非点収差調整レンズを調整する方法、非点収差調整レンズ調整装置を提供することを目的とする。
【０００８】
【課題を解決するための手段】
上記課題を解決するための第１の本発明は、回転可能にレンズ保持手段に保持された非点収差調整レンズに、平行光線束を透過させて受光面に焦線を得る工程と、前記レンズ保持手段の位置により決定される基準線、および前記焦線が一致するように前記非点収差調整レンズを回転させる工程と、を備える、非点収差調整レンズを調整する方法である。
【０００９】
第２の本発明は、非点収差調整レンズを回転可能に保持するためのレンズ保持手段と、前記非点収差調整レンズに平行光線束を照射するための平行光線束照射手段と、前記平行光線束が前記非点収差調整レンズを透過して得られる焦線を受光するための受光面と、を備え、前記焦線、および前記レンズ保持手段の位置により決定される基準線が一致するように前記非点収差調整レンズが回転可能である、非点収差調整レンズ調整装置である。
【００１０】
第３の本発明は、前記レンズ保持手段の、前記平行光線束が照射される部分に、前記基準線に対応する複数の基準マークが形成される、第２の本発明の非点収差調整レンズ調整装置である。
【００１１】
第４の本発明は、前記レンズ保持手段が、前記非点収差調整レンズを回転可能に保持するレンズホルダ、前記非点収差調整レンズを前記レンズホルダに対して回転させるためのレンズ回転機構、および前記レンズホルダを所定の位置に保持するホルダ取付台、を備え、前記レンズ回転機構により前記非点収差調整レンズが回転される、第３の本発明の非点収差調整レンズ調整装置である。
【００１２】
第５の本発明は、前記非点収差調整レンズに対して前記平行光線束照射手段が配置される反対側の位置に、前記非点収差調整レンズを通過した光線束を、再度前記非点収差調整レンズを通過させるように反射するための反射板をさらに備え、前記基準マークが反射面であり、前記反射面が前記ホルダ取付台に前記平行光線束の一部を反射するように取り付けられ、前記受光面が、前記非点収差調整レンズを再度通過した光線束、および前記複数の反射面から反射された平行光線束を受光するように配置され、前記反射板は、前記非点収差調整レンズを再度通過した光線束を、前記受光面に焦線として集光する位置に配置され、前記複数の反射面から反射される前記平行光線束が前記受光面上に複数の輝点を形成し、前記基準線は、前記複数の輝点を結んで形成される、第２〜４の本発明のいずれかの非点収差調整レンズ調整装置である。
【００１３】
第６の本発明は、前記受光面に接続された制御部をさらに有し、前記制御部は、前記基準線と前記焦線とにより形成される角度を検出し、前記検出された角度に基づいて前記レンズ回転機構を駆動させて前記非点収差調整レンズを回転させる、第４または５の本発明の非点収差調整レンズ調整装置である。
【００１４】
第７の本発明は、前記受光面または前記制御部に接続されたモニタをさらに有し、前記モニタが、前記基準線と前記焦線の位置関係を視覚的に提供する、第２〜６の本発明のいずれかの非点収差調整レンズ調整装置である。
【００１５】
第８の本発明は、前記反射面が、反射された前記平行光線束を拡散させるように角度付けされている、第５〜７の本発明のいずれかの非点収差調整レンズ調整装置である。
【００１６】
第９の本発明は、前記平行光線束が、レーザー光である、第２〜８の本発明のいずれかの非点収差調整レンズ調整装置である。
【００１７】
【発明の実施の形態】
図１は本発明の実施の形態における非点収差調整レンズの調整方法を行なうための構成を示す。
【００１８】
レーザー角度測定器１０６は、支持台１２１に接続された支持アームによって支持され、その内部には本発明の平行光線束照射手段の一例であるレーザー光源（図示せず）、照射され反射板１０５などにより反射されたレーザー光線を受光するための受光面（図示せず）を有している。また、レーザー角度測定器１０６の出力側は、受光面において受光した像をモニターできるようにモニター１０７に接続されている。
【００１９】
レーザー角度測定器１０６の測定エリア（すなわち反射板１０５などにより反射されたレーザー光を受光できる範囲）に、非点収差調整レンズ１０１を回転可能に保持するためのレンズホルダ１０３、及びレンズホルダ１０３に対して非点収差調整レンズ１０１を回転調整するための本発明の回転機構の一例であるレンズ保持部１０２、レンズホルダ１０３を所定の位置で保持するためのホルダ取付台１０４、前記レーザ角度測定器１０６から角度測定用に出射するレーザー光１１０を反射する反射板１０５が、設置されている。レンズホルダ１０３、レンズ保持部１０２、ホルダ取付台１０４は、本発明のレンズ保持手段を構成する一例である。なお、レンズホルダ１０３の詳細な構造は、図３の従来技術の場合のレンズホルダ２０３と類似している。本実施の形態のレンズホルダ１０３の場合は、ゲート２０５を保持する部分を有していない点が従来技術のレンズホルダ１０３と異なる。また、レンズ１０１、レンズ保持部１０２、レンズホルダ１０３の配置関係は、図１のレーザー光１１０の方から見ると、図３における、レンズ２０１、レンズ保持部２０２、レンズホルダ２０３の配置関係と類似した配置関係となる。
【００２０】
非点収差調整レンズ１０１のレンズホルダ１０３への取付方向は、レーザー角度検出器１０６の角度検出方向である光軸１０９に非点収差調整レンズ１０１の光軸を合わせる方向であり、図中では上下方向となる。本調整装置に於いて、前記レーザー光１１０を遮断しない位置にレンズ保持部１０２およびホルダ取付台１０４が設置されている。
【００２１】
ホルダ取付台１０４には、非点収差の調整方向の基準となる、本発明の反射面の一例である斜面１１２が設けられている。斜面１１２は、レーザー角度測定器１０６で検出できる最大角度以内の角度１１１を回転方向における基準面１３０に対して形成するように配置されている。斜面１１２は、ホルダ取付台１０４の上部に互いに対向して２つ配置され、それぞれの斜面方向は、斜面１１２で反射されたレーザー光が光軸１０９に対して拡散するように互いに逆方向に角度付けされている。
【００２２】
また、反射板１０５は、レーザー角度測定器１０６からのレーザー光１１０を反射させて受光面に焦線を結像させるように、その取付位置、取付角度が高精度に調整されて配置されている。また、本発明のレンズ保持手段は、非点収差調整レンズ１０１の光軸に対する倒れ防止のために、非点収差調整レンズ下部を支える下支え面１１４を有している。
【００２３】
次に、このように構成された非点収差調整レンズ調整装置の動作、および非点収差調整レンズ調整装置を利用した非点収差調整レンズの調整方法を説明する。
【００２４】
レーザー光源からレーザ光が光軸１０９に沿って照射され、照射されたレーザー光１１０は、レンズホルダ１０３に保持された非点収差調整レンズ１０１を通過し、反射板１０５に至る。反射板１０５で反射されたレーザー光は、再び非点収差調整レンズ１０１を通過し、レーザー角度測定器１０６内の受光面に至り、この受光面上で、焦線を結像する。
【００２５】
他方、レーザー光源から照射された光１１０の一部は、２つの斜面１１２で反射され、光軸１０９に対し拡散する方向に進行し受光面に至る。斜面１１２からの反射光は、レーザー角度測定器１０６に接続されたモニタ１０７に２つの輝点１１５として写しだされる。このようにモニタ１０７に映し出された２つの輝点１１５を結ぶことにより本発明の基準線を形成する。ここでは、一例として本発明の基準線を、２つの輝点１１５を結んだ線をモニタ１０７に描かれている十字線のうち水平線１１３に合わせることにより形成している。このような予備調整は、ホルダ取付台１０４に対して、レーザー角度測定器１０６を回転させることにより行なう。
【００２６】
モニタ１０７にはまた、受光面に結像された焦線１０８が映される。焦線１０８の形状は、非点収差調整レンズ１０１と反射板１０５との距離で変化し、非点収差調整レンズ１０１の焦点設計によりその距離は異なる。本実施形態の場合、上記距離をあらかじめ所望の焦線形状が検出できるように、レンズ保持部１０２のレンズ下支え面１１４と反射板１０５により調整されている。
【００２７】
レーザー角度測定器１０６に接続されたモニタ１０７に写しだされる焦線１０８の方向は、非点収差調整レンズ１０１の非点収差方向を示している。従って、焦線１０８をモニタ１０７上に描かれる基準線１１３に合うよう非点収差調整レンズ１０１を、レンズ保持部１０２により回転調整する事で、非点収差調整レンズ１０１とレンズホルダ１０３との方向を調整する。このように非点収差調整レンズ１０１とレンズホルダ１０３の方向を調整した後、非点収差調整レンズとレンズホルダ１０３を接着固定して本調整装置より取り出す。
【００２８】
なお、本実施形態でレンズ保持部１０２をメカニカルにチャッキングしているが、負圧を加え吸着して保持する方法に変更しても同様の効果を得られる。
【００２９】
また、ホルダ取付台１０４に設けた斜面１１２の方向や場所は図中で示した通りで無くても同様の効果を得られる。
【００３０】
また、以上までの説明では、レーザー光源からレーザー光を照射するとしてきたが、レーザー光に限られることはなく、平行光線束であればよく、その場合は、レーザー光源の代わりに平行光線束を出力する光源が使用される。
【００３１】
また、上記では、レーザー角度測定器１０６の内部にレーザ光源と受光面が配置される構成で説明したが、レーザ角度測定器１０６、レーザ光源および受光面は別の構成であってもよく、その場合は、受光面で得られた情報がレーザー角度測定器１０６を経由して、または直接モニタ１０７に送られる構成であればよい。さらに、レーザー光源と受光面は、別々に配置されていてもよく、レーザー光源から出されたレーザー光が非点収差調整レンズ１０１を透過して受光面に焦線を結像する配置であれば、上記と同様の効果を得ることができる。
【００３２】
また、上記の説明では、本発明の反射面の一例である斜面１１２は、ホルダ取付台１０４上に２つ設置される、として説明したが、２つ以上の斜面１１２がホルダ取付台１０４上に設置されていてもよく、その場合は、それらの斜面１１２から反射された輝点により本発明の基準線が形成されれば、上記と同様の効果を得ることができる。
【００３３】
また、上記の説明では、本発明の反射面の一例である斜面１１２の斜面方向は、斜面１１２で反射されたレーザー光が光軸１０９に対して拡散するように互いに逆方向に角度付けされている、としたが、本発明の反射面は、必ずしも角度付けされていなくてもよい。すなわち、本発明の反射面は、反射されたレーザー光が光軸１０９と平行に進行する構成であってもよく、その場合も、モニタ１０７に映される輝点１１５に基づいて基準線を形成することができれば、上記と同様の効果を得ることができる。
【００３４】
さらに、本発明の反射面は、必ずしも平面で構成される必要がなく、例えば、凹面により形成されていてもよく、受光面に輝点１１５を形成することができれば、どのような形状であってもよい。
【００３５】
また、以上までの説明では、本発明の基準線は、モニター１０７上の水平線１１３に一致させて形成する、としたが、複数の輝点１１５が結ばれて形成される線をモニター１０７上の水平線１１３と一致させず、焦線１０８と一致させるように調整してもよく、その場合も上記と同様の効果を得ることができる。
【００３６】
また、以上までの説明では、平行光線束照射手段から照射された平行光線束が、非点収差調整レンズ１０１を通過し、反射板１０５において反射され、再び非点収差調整レンズ１０１を通過することにより受光面に至る、としてきたが、図２に示すように、反射板１０５の代わりに、受光面１２０が配置される構成であってもよい。その場合は、平行光線束照射手段から照射された平行光線束が、非点収差調整レンズ１０１の下方に配置された受光面１２０に焦線を形成するように受光面１２０が配置されればよい。その場合は、本発明の反射面により輝点１１５が受光面１２０に形成されるのではなく、レンズホルダ１０３と所定の位置関係にある、複数の本発明の基準マークにより本発明の基準線が提供されてもよい。
【００３７】
さらに、本発明の基準線が、本発明の本発明の基準マークにより提供されるのではなくても、本発明のレンズ保持手段の位置により決定される構成であってもよく、その場合も上記と同様の効果を得ることができる。
【００３８】
例えば、ホルダ取付台１０４が本発明の平行光線束に対して透明であり、本発明の基準マークの一例としては、例えば、本発明の平行光線束の一部を遮蔽する障害物であってもよい。その場合は、受光面１２０に輝点の代わりに複数の暗点が形成され、これらの暗転を結ぶことにより本発明の基準線を形成することができればよく、その場合も上記と同様の効果を得ることができる。
【００３９】
また、以上までの説明では、受光面に受光された情報をモニタ１０７に映すことにより、本発明の基準線と焦線の位置関係を視覚的に提供して、その視覚情報に基づいて、本発明のレンズ回転機構の一例であるレンズ保持部１０２を回転させることにより、非点収差調整レンズ１０１とレンズホルダ１０３の位置を調整する、としてきたが、本発明のレンズ回転機構は、下支え面１１４であってもよい。
【００４０】
また、本発明のレンズ回転機構は、モニタ１０７により提供された視覚情報に基づき、人手により、本発明のレンズ回転機構を回転させる、として説明してきたが、本発明のレンズ回転機構に駆動源があり、本発明の基準線と焦線の位置関係から、自動的に本発明の基準線と焦線が一致するように回転される構成であってもよい。その場合は、受光面で得られた情報が、例えばレーザー角度測定器１０６に内蔵された制御部（図示せず）に伝達され、制御部において、本発明の基準線と焦線の位置関係から、本発明の基準線と焦線から形成される角度を検出し、本発明のレンズ回転機構の回転量（角度）が決定され、決定された回転量に応じて、本発明のレンズ回転機構が非点収差調整レンズ１０１を回転させる構成であればよい。
【００４１】
なお、この場合、本発明のレンズ回転機構に駆動源があり、モニタ１０７により提供される情報に基づき、人手により本発明のレンズ回転機構の駆動源を発停させながら本発明の基準線と焦線を調整してもよい。
【００４２】
【発明の効果】
本発明によれば、ゲートを必要としない非点収差調整レンズを調整する方法、非点収差調整レンズ調整装置を提供することができる。
【図面の簡単な説明】
【図１】図１は、本発明の実施の形態による非点収差調整レンズ調整装置の構成を示す概略図である。
【図２】図２は、本発明の実施の形態の形態による非点収差調整レンズ調整装置の変形例の構成を示す概略図である。
【図３】図３は、従来の非点収差調整レンズの構成を示す概略図である。
【符号の説明】
１０１，２０１　非点収差調整レンズ
１０２，２０２　レンズ保持部
１０３，２０３　レンズホルダ
１０４，２０４　ホルダ取付台
１０５　反射板
１０６　レーザー角度測定器
１０７，２０７　モニタ
１０８　焦線
１０９　光軸
１１０　レーザー光
１１１　角度
１１２　斜面
１１３　基準線
１１４　下支え面
１１５　輝点
１２０　　受光面
１２１　　支持台
２０５　ゲート
２０６　カメラ[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for adjusting an astigmatism adjustment lens and an astigmatism adjustment lens adjustment device.
[0002]
[Prior art]
FIG. 3 shows a method of adjusting a conventional astigmatism adjusting lens. According to the conventional method of adjusting the astigmatism adjustment lens, first, the astigmatism adjustment lens 201 is held by the holding unit 202 and then attached to the lens holder 203 fixed to the lens mount 204. Next, a monitor 207 is used with two position detection cameras 206 arranged at positions perpendicular to the plane of the drawing on the gates 205 at both ends of the astigmatism adjusting lens 201 and the range surrounded by the broken line in FIG. And monitor. On the monitor 207, the images of the two position detection cameras 206 are displayed side by side. A method of rotating and adjusting the astigmatism adjusting lens 201 so that the position of the gate 205 on the monitor 207 with respect to the lens holder 203 on the left and right screens is the same has been adopted.
[0003]
When the astigmatism adjusting lens 201 is used as an optical pickup, as described above, the direction of the astigmatism that can be adjusted by the design of the astigmatism adjusting lens 201 itself matches the direction of the astigmatism to be adjusted in the optical pickup. By doing so, both astigmatisms can be offset, and the amount of astigmatism in the entire optical path can be adjusted.
[0004]
[Problems to be solved by the invention]
However, if the directions of the astigmatism of the astigmatism adjusting lens do not match, not only the astigmatism cannot be canceled out, but also the amount of astigmatism in the entire optical path of the optical pickup increases, and the performance itself of the optical pickup deteriorates. I will.
[0005]
Therefore, it is necessary to adjust the direction of astigmatism of the astigmatism adjusting lens 201 with high accuracy.
[0006]
However, the above-described adjustment method requires the gate 205 adjusted with high precision with respect to the astigmatism adjustment lens 201. Therefore, the manufacturing process of the astigmatism adjusting lens 201 is complicated, and the manufacturing cost is high.
[0007]
The present invention has been made in consideration of the above problems, and has as its object to provide a method of adjusting an astigmatism adjustment lens that does not require a gate, and an astigmatism adjustment lens adjustment apparatus.
[0008]
[Means for Solving the Problems]
A first aspect of the present invention for solving the above-mentioned problems includes a step of transmitting a parallel light beam to an astigmatism adjusting lens rotatably held by lens holding means to obtain a focal line on a light receiving surface; Rotating the astigmatism adjustment lens such that the reference line determined by the position of the holding unit and the focal line coincide with each other.
[0009]
According to a second aspect of the present invention, there is provided a lens holding means for rotatably holding an astigmatism adjustment lens, a parallel light beam irradiation means for irradiating the astigmatism adjustment lens with a parallel light beam, and the parallel light beam. A light-receiving surface for receiving a focal line obtained by transmitting the bundle through the astigmatism adjustment lens, so that the focal line and a reference line determined by the position of the lens holding unit coincide with each other. An astigmatism adjustment lens adjustment device, wherein the astigmatism adjustment lens is rotatable.
[0010]
A third aspect of the present invention is the astigmatism adjusting lens according to the second aspect of the present invention, wherein a plurality of reference marks corresponding to the reference lines are formed on a portion of the lens holding unit where the parallel light beam is irradiated. An adjusting device.
[0011]
In a fourth aspect of the present invention, the lens holding means rotatably holds the astigmatism adjustment lens, a lens rotation mechanism for rotating the astigmatism adjustment lens with respect to the lens holder, and A third astigmatic adjustment lens adjusting device according to the present invention, further comprising a holder mounting base for holding the lens holder at a predetermined position, wherein the astigmatism adjusting lens is rotated by the lens rotating mechanism.
[0012]
According to a fifth aspect of the present invention, the light beam passing through the astigmatism adjusting lens is re-positioned at a position on the opposite side of the astigmatism adjusting lens where the parallel light beam irradiation means is disposed. A reflection plate for reflecting the light so as to pass through the adjustment lens, wherein the reference mark is a reflection surface, and the reflection surface is attached to the holder mount so as to reflect a part of the parallel light beam; The light receiving surface is arranged so as to receive the light beam that has passed through the astigmatism adjusting lens again, and the parallel light beam reflected from the plurality of reflecting surfaces, and the reflector has the astigmatism adjusting lens. The light beam that has passed through again is arranged at a position where the light beam is collected as a focal line on the light receiving surface, and the parallel light beam reflected from the plurality of reflecting surfaces forms a plurality of bright spots on the light receiving surface, The reference line is the plurality of reference lines. Is formed by connecting the points, an astigmatism correction lens adjustment apparatus of any of the second to fourth invention.
[0013]
A sixth aspect of the present invention further includes a control unit connected to the light receiving surface, wherein the control unit detects an angle formed by the reference line and the focal line, based on the detected angle. A fourth or fifth astigmatism adjusting lens adjusting device according to the present invention, wherein the astigmatism adjusting lens is rotated by driving the lens rotating mechanism.
[0014]
A seventh aspect of the present invention further includes a monitor connected to the light receiving surface or the control unit, wherein the monitor visually provides a positional relationship between the reference line and the focal line. It is any one of the astigmatism adjustment lens adjustment devices of the present invention.
[0015]
An eighth aspect of the present invention is the astigmatism adjusting lens adjusting device according to any one of the fifth to seventh aspects of the present invention, wherein the reflecting surface is angled so as to diffuse the reflected parallel light beam. .
[0016]
A ninth aspect of the present invention is the astigmatism adjusting lens adjusting device according to any one of the second to eighth aspects of the present invention, wherein the parallel light beam is a laser beam.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 shows a configuration for performing a method of adjusting an astigmatism adjustment lens according to an embodiment of the present invention.
[0018]
The laser angle measuring device 106 is supported by a support arm connected to the support table 121, and has a laser light source (not shown), which is an example of the parallel beam irradiating means of the present invention, an illuminated reflector 105 and the like. And has a light receiving surface (not shown) for receiving the laser beam reflected by the laser beam. The output side of the laser angle measuring device 106 is connected to a monitor 107 so that an image received on the light receiving surface can be monitored.
[0019]
A lens holder 103 and a lens holder 103 for rotatably holding the astigmatism adjusting lens 101 in a measurement area of the laser angle measuring device 106 (that is, a range in which laser light reflected by the reflector 105 or the like can be received). On the other hand, a lens holder 102 as an example of a rotation mechanism of the present invention for rotating and adjusting the astigmatism adjusting lens 101, a holder mount 104 for holding a lens holder 103 at a predetermined position, and the laser angle measuring device. A reflector 105 for reflecting a laser beam 110 emitted from 106 for angle measurement is provided. The lens holder 103, the lens holder 102, and the holder mount 104 are examples of a lens holding unit of the present invention. Note that the detailed structure of the lens holder 103 is similar to the lens holder 203 in the case of the prior art in FIG. The lens holder 103 of the present embodiment is different from the lens holder 103 of the related art in that the lens holder 103 does not have a portion for holding the gate 205. The arrangement of the lens 101, the lens holder 102, and the lens holder 103 is similar to the arrangement of the lens 201, the lens holder 202, and the lens holder 203 in FIG. 3 when viewed from the laser beam 110 in FIG. The arrangement relationship is as follows.
[0020]
The direction in which the astigmatism adjustment lens 101 is attached to the lens holder 103 is a direction in which the optical axis of the astigmatism adjustment lens 101 is aligned with the optical axis 109 which is the angle detection direction of the laser angle detector 106. Direction. In the present adjusting device, a lens holding portion 102 and a holder mount 104 are provided at positions where the laser beam 110 is not blocked.
[0021]
The holder mounting base 104 is provided with a slope 112, which is an example of the reflection surface of the present invention, which serves as a reference for the adjustment direction of astigmatism. The slope 112 is arranged so as to form an angle 111 within the maximum angle that can be detected by the laser angle measuring device 106 with respect to the reference plane 130 in the rotation direction. Two slopes 112 are arranged on the upper part of the holder mount 104 so as to face each other, and the respective slope directions are angled in opposite directions so that the laser light reflected by the slope 112 is diffused with respect to the optical axis 109. Is attached.
[0022]
The mounting position and the mounting angle of the reflecting plate 105 are adjusted with high precision so that the reflecting plate 105 reflects the laser beam 110 from the laser angle measuring device 106 to form a focal line on the light receiving surface. . Further, the lens holding means of the present invention has a lower support surface 114 for supporting a lower portion of the astigmatism adjusting lens in order to prevent the astigmatism adjusting lens 101 from falling down with respect to the optical axis.
[0023]
Next, the operation of the astigmatism adjusting lens adjusting device thus configured and a method of adjusting the astigmatic adjusting lens using the astigmatic adjusting lens adjusting device will be described.
[0024]
Laser light is emitted from the laser light source along the optical axis 109, and the emitted laser light 110 passes through the astigmatism adjusting lens 101 held by the lens holder 103 and reaches the reflector 105. The laser light reflected by the reflecting plate 105 passes through the astigmatism adjusting lens 101 again, reaches the light receiving surface in the laser angle measuring device 106, and forms a focal line on the light receiving surface.
[0025]
On the other hand, a part of the light 110 emitted from the laser light source is reflected by the two slopes 112, travels in a direction to diffuse with respect to the optical axis 109, and reaches the light receiving surface. The reflected light from the slope 112 is projected as two bright points 115 on the monitor 107 connected to the laser angle measuring device 106. Thus, the reference line of the present invention is formed by connecting the two luminescent spots 115 projected on the monitor 107. Here, as an example, the reference line of the present invention is formed by aligning a line connecting two bright points 115 with the horizontal line 113 among the crosshairs drawn on the monitor 107. Such preliminary adjustment is performed by rotating the laser angle measuring device 106 with respect to the holder mount 104.
[0026]
The monitor 107 also displays a focal line 108 formed on the light receiving surface. The shape of the focal line 108 changes depending on the distance between the astigmatism adjusting lens 101 and the reflecting plate 105, and the distance differs depending on the focal point design of the astigmatism adjusting lens 101. In the case of the present embodiment, the distance is adjusted in advance by the lens support surface 114 of the lens holding unit 102 and the reflector 105 so that a desired focal line shape can be detected.
[0027]
The direction of the focal line 108 projected on the monitor 107 connected to the laser angle measuring device 106 indicates the astigmatism direction of the astigmatism adjusting lens 101. Therefore, by rotating the astigmatism adjusting lens 101 by the lens holding unit 102 so that the focal line 108 is aligned with the reference line 113 drawn on the monitor 107, the direction between the astigmatism adjusting lens 101 and the lens holder 103 is adjusted. To adjust. After adjusting the directions of the astigmatism adjustment lens 101 and the lens holder 103 in this way, the astigmatism adjustment lens and the lens holder 103 are adhered and fixed and taken out from the adjustment apparatus.
[0028]
Although the lens holding unit 102 is mechanically chucked in the present embodiment, the same effect can be obtained by changing to a method of holding by suction by applying a negative pressure.
[0029]
Further, the same effect can be obtained even if the direction and location of the slope 112 provided on the holder mounting base 104 are not as shown in the figure.
[0030]
In the above description, the laser light is emitted from the laser light source. However, the laser light is not limited to the laser light, but may be a parallel light flux. In that case, a parallel light flux is used instead of the laser light source. An output light source is used.
[0031]
In the above description, the laser light source and the light receiving surface are arranged inside the laser angle measuring device 106. However, the laser angle measuring device 106, the laser light source, and the light receiving surface may have different configurations. In this case, any configuration may be used as long as the information obtained on the light receiving surface is sent to the monitor 107 via the laser angle measuring device 106 or directly. Further, the laser light source and the light receiving surface may be separately arranged, provided that the laser light emitted from the laser light source passes through the astigmatism adjusting lens 101 and forms a focal line on the light receiving surface. Thus, the same effect as described above can be obtained.
[0032]
Further, in the above description, two slopes 112, which are examples of the reflection surface of the present invention, are described as being installed on the holder mount 104, but two or more slopes 112 are arranged on the holder mount 104. In this case, the same effects as described above can be obtained if the reference line of the present invention is formed by the bright spots reflected from the slopes 112.
[0033]
In the above description, the slope direction of the slope 112, which is an example of the reflection surface of the present invention, is angled in opposite directions so that the laser light reflected by the slope 112 is diffused with respect to the optical axis 109. However, the reflecting surface of the present invention does not necessarily have to be angled. That is, the reflecting surface of the present invention may have a configuration in which the reflected laser beam travels in parallel with the optical axis 109. In this case, the reflecting surface forms the reference line based on the bright spot 115 projected on the monitor 107. If it can do, the same effect as the above can be obtained.
[0034]
Further, the reflecting surface of the present invention does not necessarily need to be formed of a flat surface, and may be formed of, for example, a concave surface, and may have any shape as long as the luminescent spot 115 can be formed on the light receiving surface. Is also good.
[0035]
In the above description, the reference line of the present invention is formed so as to coincide with the horizontal line 113 on the monitor 107. However, the line formed by connecting the plurality of luminescent spots 115 is formed on the monitor 107. The adjustment may be made so as not to coincide with the horizontal line 113 but to coincide with the focal line 108. In such a case, the same effect as described above can be obtained.
[0036]
Also, in the above description, the parallel light beam emitted from the parallel light beam irradiation means passes through the astigmatism adjusting lens 101, is reflected by the reflection plate 105, and passes through the astigmatism adjusting lens 101 again. However, as shown in FIG. 2, a light receiving surface 120 may be provided instead of the reflection plate 105 as shown in FIG. In that case, the light receiving surface 120 may be arranged so that the parallel light beam emitted from the parallel light beam irradiating means forms a focal line on the light receiving surface 120 arranged below the astigmatism adjusting lens 101. . In that case, the luminescent spot 115 is not formed on the light receiving surface 120 by the reflective surface of the present invention, but the reference line of the present invention is formed by a plurality of fiducial marks of the present invention in a predetermined positional relationship with the lens holder 103. May be provided.
[0037]
Further, the reference line of the present invention may not be provided by the reference mark of the present invention but may be determined by the position of the lens holding means of the present invention. The same effect as described above can be obtained.
[0038]
For example, the holder mount 104 is transparent to the parallel light beam of the present invention, and an example of the reference mark of the present invention is, for example, an obstacle that blocks a part of the parallel light beam of the present invention. Good. In that case, a plurality of dark spots are formed on the light receiving surface 120 instead of the bright spots, and it is sufficient if the reference line of the present invention can be formed by connecting these dark turns. In that case, the same effect as described above can be obtained. Obtainable.
[0039]
In the above description, the information received on the light receiving surface is displayed on the monitor 107 to visually provide the positional relationship between the reference line and the focal line according to the present invention. The position of the astigmatism adjusting lens 101 and the lens holder 103 has been adjusted by rotating the lens holding unit 102, which is an example of the lens rotating mechanism of the present invention. It may be.
[0040]
In addition, the lens rotation mechanism of the present invention has been described as rotating the lens rotation mechanism of the present invention manually based on visual information provided by the monitor 107. In addition, the configuration may be such that the reference line and the focal line according to the present invention are automatically rotated from the positional relationship between the reference line and the focal line according to the present invention so as to coincide with each other. In that case, information obtained on the light receiving surface is transmitted to, for example, a control unit (not shown) built in the laser angle measuring device 106, and the control unit determines the positional relationship between the reference line and the focal line of the present invention. The angle formed by the reference line and the focal line of the present invention is detected, the amount of rotation (angle) of the lens rotating mechanism of the present invention is determined, and the lens rotating mechanism of the present invention is adjusted according to the determined amount of rotation. Any configuration that rotates the astigmatism adjustment lens 101 may be used.
[0041]
In this case, the lens rotating mechanism of the present invention has a driving source, and the driving source of the lens rotating mechanism of the present invention is manually turned on and off based on the information provided by the monitor 107 to focus on the reference line of the present invention. The line may be adjusted.
[0042]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, the method of adjusting the astigmatism adjustment lens which does not require a gate, and the astigmatism adjustment lens adjustment apparatus can be provided.
[Brief description of the drawings]
FIG. 1 is a schematic diagram illustrating a configuration of an astigmatism adjustment lens adjustment device according to an embodiment of the present invention.
FIG. 2 is a schematic diagram showing a configuration of a modification of the astigmatism adjustment lens adjustment device according to the embodiment of the present invention.
FIG. 3 is a schematic diagram showing a configuration of a conventional astigmatism adjustment lens.
[Explanation of symbols]
101, 201 Astigmatism adjusting lens 102, 202 Lens holding unit 103, 203 Lens holder 104, 204 Holder mount 105 Reflector 106 Laser angle measuring device 107, 207 Monitor 108 Focal line 109 Optical axis 110 Laser beam 111 Angle 112 Slope 113 Reference line 114 Lower support surface 115 Bright spot 120 Light receiving surface 121 Support base 205 Gate 206 Camera

Claims

A step of transmitting a parallel light beam to the astigmatism adjusting lens rotatably held by the lens holding means to obtain a focal line on the light receiving surface,
Rotating the astigmatism adjustment lens such that the reference line determined by the position of the lens holding unit and the focal line coincide with each other.

Lens holding means for rotatably holding the astigmatism adjustment lens,
Parallel light beam irradiation means for irradiating the astigmatism adjustment lens with a parallel light beam,
A light receiving surface for receiving a focal line obtained by transmitting the parallel ray bundle through the astigmatism adjustment lens,
An astigmatism adjustment lens adjustment device, wherein the astigmatism adjustment lens is rotatable such that the focal line coincides with a reference line determined by the position of the lens holding unit.

The astigmatism adjustment lens adjustment device according to claim 2, wherein a plurality of reference marks corresponding to the reference line are formed on a portion of the lens holding unit where the parallel light beam is irradiated.

A lens holder that rotatably holds the astigmatism adjustment lens, a lens rotation mechanism that rotates the astigmatism adjustment lens with respect to the lens holder, and a lens holder that moves the lens holder to a predetermined position. A holder mounting base for holding the
The astigmatism adjustment lens adjustment device according to claim 3, wherein the astigmatism adjustment lens is rotated by the lens rotation mechanism.

At a position on the opposite side of the astigmatism adjusting lens where the parallel light beam irradiating means is disposed, the light beam passing through the astigmatism adjusting lens is passed again through the astigmatism adjusting lens. A reflecting plate for reflecting, the reference mark is a reflecting surface, and the reflecting surface is attached to the holder mount so as to reflect a part of the parallel light beam;
The light receiving surface is disposed so as to receive the light beam that has passed through the astigmatism adjustment lens again, and the parallel light beam reflected from the plurality of reflecting surfaces,
The reflector is disposed at a position where the light beam that has passed through the astigmatism adjustment lens again is focused on the light receiving surface as a focal line,
The parallel light flux reflected from the plurality of reflection surfaces forms a plurality of bright spots on the light receiving surface,
The astigmatism adjustment lens adjustment device according to claim 2, wherein the reference line is formed by connecting the plurality of bright points.

A control unit connected to the light receiving surface;
The control unit detects an angle formed by the reference line and the focal line, and drives the lens rotation mechanism based on the detected angle to rotate the astigmatism adjustment lens. 6. The astigmatism adjusting lens adjusting device according to 4 or 5.

Further comprising a monitor connected to the light receiving surface or the control unit,
The astigmatism adjusting lens adjusting device according to claim 2, wherein the monitor visually provides a positional relationship between the reference line and the focal line.

The astigmatism adjusting lens adjusting device according to claim 5, wherein the reflecting surface is angled so as to diffuse the reflected parallel light beam.

The astigmatism adjusting lens adjusting device according to claim 2, wherein the parallel light beam is a laser beam.