| 发明名称 | Imaging lens and imaging apparatus equipped with the imaging lens | ||
| 摘要 | An imaging lens is constituted of five lenses, including, in order from the object side to the image side: a first lens having a positive refractive power, which is of a meniscus shape having a convex surface toward the object side; a second lens having a negative refractive power and a concave surface toward the image side; a third lens having a positive refractive power, which is of a meniscus shape having a convex surface toward the object side; a fourth lens having a negative refractive power; and a fifth lens having a negative refractive power and at least one inflection point on the surface thereof toward the image side. Predetermined conditional formulae are satisfied. | ||
| 申请公布号 | US9575290(B2) | 申请公布日期 | 2017.02.21 |
| 申请号 | US201514856585 | 申请日期 | 2015.09.17 |
| 申请人 | FUJIFILM Corporation | 发明人 | Kondo Masato;Noda Takayuki;Ogino Tatsuyuki;Cho Michio |
| 分类号 | G02B13/18;G02B9/60;G02B13/00;G02B5/00;G02B27/00 | 主分类号 | G02B13/18 |
| 代理机构 | Jianq Chyun IP Office | 代理人 | Jianq Chyun IP Office |
| 主权项 | 1. An imaging lens consisting of five lenses, including, in order from the object side to the image side: a first lens having a positive refractive power, which is of a meniscus shape having a convex surface toward the object side; a second lens having a negative refractive power and a concave surface toward the image side; a third lens having a positive refractive power, which is of a meniscus shape having a convex surface toward the object side; a fourth lens having a negative refractive power; and a fifth lens having a negative refractive power and at least one inflection point on the surface thereof toward the image side; in which the conditional formulae below are satisfied: −3<f1/f23<−0.38 (1)−1<f/f2<−0.82 (2-2)−0.18<(R3f−R3r)/(R3f+R3r)<0.5 (3) wherein f1 is the focal length of the first lens, f23 is the combined focal length of the second lens and the third lens, f is the focal length of the entire lens system, f2 is the focal length of the second lens, R3f is the paraxial radius of curvature of the surface of the third lens toward the object side, and R3r is the paraxial radius of curvature of the surface of the third lens toward the image side. | ||
| 地址 | Tokyo JP | ||