| 发明名称 | Optical system, and image pickup apparatus having the same | ||
| 摘要 | An optical system includes an aperture diaphragm having such a curved surface shape that an aperture part moves in an optical axis direction as an aperture diameter changes. The aperture diaphragm has a convex shape on an object side when an optical system on the object side of the aperture diaphragm has a negative refractive power, and the aperture diaphragm has a convex shape on an image side when the optical system on the object side of the aperture diaphragm has a positive refractive power. | ||
| 申请公布号 | US8891180(B2) | 申请公布日期 | 2014.11.18 |
| 申请号 | US201313875786 | 申请日期 | 2013.05.02 |
| 申请人 | Canon Kabushiki Kaisha | 发明人 | Sakai Hideki |
| 分类号 | G02B9/08;G02B13/18;G03B9/06;G03B9/02;G02B15/20 | 主分类号 | G02B9/08 |
| 代理机构 | Carter, DeLuca, Farrell & Schmidt, LLP | 代理人 | Carter, DeLuca, Farrell & Schmidt, LLP |
| 主权项 | 1. An optical system comprising an aperture diaphragm having such a curved surface shape that an aperture part moves in an optical axis direction as an aperture diameter changes, wherein the aperture diaphragm has a convex shape on an object side when an optical system on the object side of the aperture diaphragm has a negative refractive power, and the aperture diaphragm has a convex shape on an image side when the optical system on the object side of the aperture diaphragm has a positive refractive power. | ||
| 地址 | Tokyo JP | ||