发明名称 |
Zoom lens and optical apparatus |
摘要 |
A zoom lens and optical apparatus includes, in order from a magnification conjugate side, a first lens unit that has a positive refractive power and is fixed during magnification variations, and a magnification-variable unit configured to move for magnification variations. The first lens unit includes, in order from the magnification conjugate side, a first lens sub-unit that has a positive refractive power and is configured to move during focusing, and a second lens sub-unit that has a positive refractive power and moves during focusing. The first lens sub-unit and the second lens sub-unit move and reduce an interval between the first lens sub-unit and the second lens sub-unit for focusing from infinity to a close end. A surface of the second lens sub-unit closest to the magnification conjugate side has a concave shape on the magnification conjugate side. |
申请公布号 |
US8873156(B2) |
申请公布日期 |
2014.10.28 |
申请号 |
US201113295702 |
申请日期 |
2011.11.14 |
申请人 |
Canon Kabushiki Kaisha |
发明人 |
Ichimura Junya |
分类号 |
G02B15/17;G02B15/14 |
主分类号 |
G02B15/17 |
代理机构 |
Rossi, Kimms & McDowell LLP |
代理人 |
Rossi, Kimms & McDowell LLP |
主权项 |
1. A zoom lens comprising, in order from a magnification conjugate side, a first lens unit that has a positive refractive power and is fixed during magnification variations, and a magnification-variable unit configured to move for magnification variations,
wherein the first lens unit includes, in order from the magnification conjugate side, a first lens sub-unit that has a positive refractive power and is configured to move during focusing, and a second lens sub-unit that has a positive refractive power and is configured to move during focusing, wherein the first lens sub-unit and the second lens sub-unit are configured to move and reduce an interval between the first lens sub-unit and the second lens sub-unit for focusing from infinity to a close end, and wherein a surface of the second lens sub-unit closest to the magnification conjugate side has a concave shape on the magnification conjugate side. |
地址 |
JP |