| 发明名称 | Retrofocus-type wide angle lens and imaging apparatus | ||
| 摘要 | A retrofocus-type wide-angle lens consists of a negative first lens-group, a positive second lens-group, and a positive third lens-group in this order from an object-side. The first lens-group consists of a positive meniscus-lens with its convex surface facing the object-side and three negative meniscus-lenses with their convex surfaces facing the object-side in this order from the object-side. The second lens-group includes two cemented lenses, and a lens closest to an image-side in the second lens-group is one of the at least two cemented lenses. The third lens-group consists of a 3a-th lens-group, which consists of a positive meniscus-lens with its convex surface facing the object-side and a negative meniscus-lens with its convex surface facing the object-side, and a 3b-th lens-group, which includes at least two cemented lenses and has positive refractive power as a whole, in this order from the object-side. | ||
| 申请公布号 | US9423596(B2) | 申请公布日期 | 2016.08.23 |
| 申请号 | US201514735376 | 申请日期 | 2015.06.10 |
| 申请人 | FUJIFILM Corporation | 发明人 | Shimada Yasutaka |
| 分类号 | G02B13/04;G02B9/12 | 主分类号 | G02B13/04 |
| 代理机构 | Young & Thompson | 代理人 | Young & Thompson |
| 主权项 | 1. A retrofocus-type wide angle lens consisting of: a first lens group having negative refractive power as a whole; a second lens group having positive refractive power as a whole; and a third lens group having positive refractive power as a whole in this order from an object side, wherein the first lens group consists of a positive meniscus lens with its convex surface facing the object side and three negative meniscus lenses with their convex surfaces facing the object side in this order from the object side, wherein the second lens group includes at least two cemented lenses, and a lens closest to an image side in the second lens group is one of the at least two cemented lenses, and wherein the third lens group consists of a 3a-th lens group, which consists of a positive meniscus lens with its convex surface facing the object side and a negative meniscus lens with its convex surface facing the object side, and a 3b-th lens group, which includes at least two cemented lenses and has positive refractive power as a whole, in this order from the object side. | ||
| 地址 | Tokyo JP | ||