| 发明名称 |
OPTICAL SYSTEM AND IMAGE PICKUP APPARATUS INCLUDING THE SAME |
| 摘要 |
At least one embodiment of an optical system includes, in order from an object side to an image side, a front unit including a plurality of lenses, an aperture stop, and a rear unit having a positive refractive power. In at least one embodiment, four negative lenses are consecutively arranged from a side of the front unit closest to the object side, and a focal length of the front unit and a focal length of the rear unit are appropriately set. |
| 申请公布号 |
US2017108679(A1) |
申请公布日期 |
2017.04.20 |
| 申请号 |
US201615280665 |
申请日期 |
2016.09.29 |
| 申请人 |
CANON KABUSHIKI KAISHA |
发明人 |
Eguchi Yosuke |
| 分类号 |
G02B15/177;H04N5/369;H04N5/341 |
主分类号 |
G02B15/177 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
1. An optical system comprising in order from an object side to an image side:
a front unit including a plurality of lenses; an aperture stop; and a rear unit having a positive refractive power, wherein the front unit includes four negative lenses consecutively arranged from a side closest to the object side, and the following conditional expression is satisfied
−0.90<fr/ff<0.75, where ff represents a focal length of the front unit, and fr represents a focal length of the rear unit. |
| 地址 |
Tokyo JP |
