| 发明名称 | Optical system and optical apparatus | ||
| 摘要 | An optical system consists essentially of, in order from the magnification side, a first lens having a positive refractive power with a convex surface on the magnification side, a second lens having a negative refractive power, a third lens having a negative refractive power, a fourth lens having a positive refractive power, a fifth lens having a positive refractive power, and a sixth lens having a positive refractive power, wherein the following conditional expressions (1) and (2) are satisfied: 0.17<D2/f<0.80 (1)−60<νd1−νd2<−15 (2) where D2: distance on the optical axis between the first lens and the second lensf: focal length of the entire systemνd1: Abbe number of the first lens with reference to d-lineνd2: Abbe number of the second lens with reference to d-line. | ||
| 申请公布号 | US9563042(B2) | 申请公布日期 | 2017.02.07 |
| 申请号 | US201514834747 | 申请日期 | 2015.08.25 |
| 申请人 | FUJIFILM Corporation | 发明人 | Baba Tomoyuki;Cho Michio |
| 分类号 | G02B9/62;G02B13/16;G02B27/14 | 主分类号 | G02B9/62 |
| 代理机构 | Birch, Stewart, Kolasch & Birch, LLP | 代理人 | Birch, Stewart, Kolasch & Birch, LLP |
| 主权项 | 1. An optical system, consisting of, in order from the magnification side, a first lens having a positive refractive power with a convex surface on the magnification side, a second lens having a negative refractive power, a third lens having a negative refractive power, a fourth lens having a positive refractive power, a fifth lens having a positive refractive power, and a sixth lens having a positive refractive power, wherein the following conditional expressions (1) and (2) are satisfied: 0.17<D2/f<0.80 (1) −60<νd1−νd2<−15 (2)where D2: distance on the optical axis between the first lens and the second lens f: focal length of the entire system νd1: Abbe number of the first lens with reference to d-line νd2: Abbe number of the second lens with reference to d-line. | ||
| 地址 | Tokyo JP | ||