| 发明名称 | Imaging lens and imaging apparatus | ||
| 摘要 | An imaging lens consists of negative first lens, negative second lens of a biconcave shape, third lens of a plano-convex shape having a convex surface directed toward an object side or of a positive meniscus shape having a convex surface directed toward the object side, and a fourth lens of a plano-convex shape having a convex surface directed toward an image side or of a positive meniscus shape having a convex surface directed toward the image side, which are arranged in this order from the object side. Further, the following conditional formula (11) is satisfied: 3.1<R4/f (11), where R4: a curvature radius of an image-side surface of the second lens, andf: a focal length of an entire system. | ||
| 申请公布号 | US8896939(B2) | 申请公布日期 | 2014.11.25 |
| 申请号 | US201314055267 | 申请日期 | 2013.10.16 |
| 申请人 | FUJIFILM Corporation | 发明人 | Asami Taro |
| 分类号 | G02B13/04;G02B9/34;G02B13/00;G02B13/06 | 主分类号 | G02B13/04 |
| 代理机构 | Young & Thompson | 代理人 | Young & Thompson |
| 主权项 | 1. An imaging lens consisting of: a negative first lens; a negative second lens of a biconcave shape; a third lens of a plano-convex shape having a convex surface directed toward an object side or of a positive meniscus shape having a convex surface directed toward the object side; and a fourth lens of a plano-convex shape having a convex surface directed toward an image side or of a positive meniscus shape having a convex surface directed toward the image side, which are arranged in this order from the object side, wherein the following conditional formula (11) is satisfied: 3.1<R4/f (11),where R4: a curvature radius of an image-side surface of the second lens, and f: a focal length of an entire system. | ||
| 地址 | Tokyo JP | ||