JP6829710B2 - ビジョンシステムカメラのための定倍率レンズ - Google Patents
ビジョンシステムカメラのための定倍率レンズ Download PDFInfo
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Description
本出願は、2012年12月26日に出願された「ビジョンシステムカメラのための定倍率レンズ」という名称の米国特許仮出願番号第61/745,927号の利益を主張するものであり、その全開示内容は参照により本明細書に組み込まれる。
本発明はマシンビジョンシステム、より具体的には手持ち式のシンボロジーリーダで使用される光学系、およびそのような光学系を使用するための方法に関する。
(a)L1とL2の焦点が描画された面で一致している(d1=f1+f2)。
(b)アセンブリの開口絞り(AS)がL1の裏面とL1の焦点との間にある。
(c)アセンブリの倍率は一定でf2/f1に等しい。
(d)アセンブリの焦点位置の変位は(f1/f2)2*(アセンブリの光軸に沿った移動)である。
S_2=Sobj/(A1*Sobj−1) (式1)
A_LL=1/(S_2−d1)+1/d2 (式2)
m1=1/(A1*S_obj−1) (式3)
第2の レンズ (グループ)の倍率 m2 は次に等しい。
m2=1/(A_LL*(S_2−d1)−1) (式4)
ここで液体レンズ L2Lがレンズ L1Lの後焦点に置かれたら、この 表現もd1=1/A1と書くことができる。
M=m1*m2=d2/d1 (式5)
ここに、Mはシステム倍率、m1は固定されたレンズグループ/アセンブリの倍率、m2は液体レンズグループ/アセンブリの倍率、d1はレンズL1LとレンズL2Lのそれぞれの光学面の間の距離、およびd2は液体レンズL2Lの光学面とイメージセンサ840の間の距離である。
以下の表に、膜型液体レンズを採用した定倍率レンズアセンブリの作動例に対する幾つかの一般化されたパラメータを示して説明する。
レンズ1の焦点距離 f1=100mm
最も近い対象物距離 S_near=−200mm
最も遠い対象物距離 S_far=−400mm
中間の近い画像S2 S2_near=200mm
中間の遠い*画像S2 S2_far=133.333mm
レンズ間の距離 d1=f1mm
L2Lとセンサの距離 d2=20mm
近い対象物に対するL2Lの焦点距離 f_ll_near=16.667mm
近い場合のL2Lの屈折力(ジオプタ) A_ll_near=60ジオプタ
遠い対象物に対するL2Lの焦点距離 f_ll_far=12.5mm
遠い場合のL2Lの屈折力(ジオプタ) A_ll_far=80ジオプタ
L2Lに要求される屈折力範囲(ジオプタ) R=20ジオプタ
近い距離における倍率 m1_near=−1
m2_near=0.2
M_near=m1*m2=−0.2
遠い距離における倍率 m1_far=−0.333
m2_far=0.6
M_far=m1*m2=−0.2
Claims (11)
- 視野内の焦点距離の範囲にわたって対象物の画像を取得するためのビジョンシステムであって、
当該システムはビジョンプロセッサに作動的に結合されたイメージセンサを有し、
当該システムはさらに、シーンから光を受け取ってイメージセンサに送る、光軸に沿って向けられている定倍率レンズアセンブリを有し、該定倍率レンズアセンブリはイメージセンサと前部レンズアセンブリとの間に向けられている液体レンズアセンブリを含み、
当該システムはさらに、前記前部レンズアセンブリの裏面と前記前部レンズアセンブリの焦点との間に、前記定倍率レンズアセンブリの開口絞りを有し、かつ
当該システムはさらに、焦点距離の範囲にわたる各焦点距離で対象物上の焦点を一定のシステム倍率Mに維持するために液体レンズアセンブリの倍率m2を選択的に調整するコントローラを有している、
上記ビジョンシステム。 - 当該システムはさらに後部レンズアセンブリを有し、前部レンズアセンブリと後部レンズアセンブリは両者間の固定した空間的関係に配置されている請求項1記載のビジョンシステム。
- 前部レンズアセンブリと後部レンズアセンブリは、前部レンズアセンブリの焦点と液体レンズアセンブリの前部主面が一致するように構成および配置されている、請求項2記載のビジョンシステム。
- 前部レンズアセンブリと後部レンズアセンブリは、定倍率レンズアセンブリの倍率が一定であり液体レンズアセンブリからイメージセンサまでの距離(d2)と前部レンズアセンブリと液体レンズアセンブリ間の距離(d1)の比に等しくなるように構成および配置されている、請求項1記載のビジョンシステム。
- 視野内の焦点距離の範囲にわたって対象物の画像を取得するための方法であって、
前記方法は、視野内の前記対象物を定倍率レンズアセンブリの前部レンズアセンブリから少なくとも350mmの距離に配置するステップを含み、
さらに前記方法は、対象物がイメージセンサで所望の焦点を達成するまで、0.2倍である定倍率レンズアセンブリを反復調整するステップを含み、前記イメージセンサはビジョンプロセッサと作動的に結合され、前記定倍率レンズアセンブリシーンは光軸に沿って向けられていてシーンから光を受け取って前記イメージセンサに前記光を送るものであり、
前記定倍率レンズアセンブリは前部レンズアセンブリ及び後部レンズアセンブリを有し、定倍率レンズアセンブリの開口絞りが前部レンズアセンブリの裏面と前部レンズアセンブリの焦点との間に設けられている、
上記方法。 - 前記方法はさらに前記前部レンズアセンブリとイメージセンサとの間に向けられている液体レンズアセンブリを設置するステップをさらに含む、請求項5記載の方法。
- 前記前部レンズアセンブリの焦点と前記後部レンズアセンブリの前部主面が一致するよう構成されてなる、請求項5記載の方法。
- 前記後部レンズアセンブリが可変屈折力を有する、請求項5記載の方法。
- 前記定倍率アセンブリの倍率は一定で後部レンズグループからセンサまでの距離d2と前記前部レンズアセンブリから後部レンズアセンブリまでの距離d1との比に等しい、請求項5記載の方法。
- 前記反復調整するステップは、前記液体レンズアセンブリの屈折力を調整することを含む、請求項6記載の方法。
- 前記前部レンズアセンブリは、撮像される対象物に関連する面積又は視野に関連する面積の少なくとも1つより小さい第1の領域をもつ前部レンズを備える、請求項1記載のビジョンシステム。
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US14/139,867 US9715612B2 (en) | 2012-12-26 | 2013-12-23 | Constant magnification lens for vision system camera |
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US9715612B2 (en) | 2012-12-26 | 2017-07-25 | Cognex Corporation | Constant magnification lens for vision system camera |
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