| 发明名称 |
IMAGING OPTICAL SYSTEM |
| 摘要 |
An imaging optical system includes a positive first lens element having a convex surface on the object side, a negative second lens element having a concave surface on the image side, a third lens element, a positive fourth lens element, a fifth lens element, and a negative sixth lens element provided with at least one aspherical surface that has inflection points other than at an optical axis thereof. The following conditions (1) and (2) are satisfied:;0.86<f/f12<1.20 (1), and;−0.71<(r11−r12)/(r11+r12)<−0.20 (2),;wherein f designates the focal length of the imaging optical system, f12 designates the combined focal length of the first and second lens elements, and r11 and r12 designate the radius of curvatures of surfaces on the object side and image side of the first lens element, respectively. |
| 申请公布号 |
US2016124192(A1) |
申请公布日期 |
2016.05.05 |
| 申请号 |
US201514879624 |
申请日期 |
2015.10.09 |
| 申请人 |
HOYA CORPORATION |
发明人 |
KOREEDA Daisuke |
| 分类号 |
G02B13/00;G02B27/00;G02B9/62 |
主分类号 |
G02B13/00 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
1. An imaging optical system comprising a positive first lens element having a convex surface on the object side, a negative second lens element having a concave surface on the image side, a third lens element, a positive fourth lens element, a fifth lens element, and a negative sixth lens element provided with at least one aspherical surface that has inflection points other than at an optical axis thereof, in that order from the object side, and
wherein the following conditions (1) and (2) are satisfied:
0.86<f/f12<1.20 (1), and−0.71<(r11−r12)/(r11+r12)<−0.20 (2),wherein
f designates the focal length of said imaging optical system, f12 designates the combined focal length of said first lens element and said second lens element, r11 designates the radius of curvature of a surface on the object side of said first lens element, and r12 designates the radius of curvature of a surface on the image side of said first lens element. |
| 地址 |
Tokyo JP |
