| 发明名称 |
Zoom Lens and Image Pickup Apparatus Equipped with Same |
| 摘要 |
A zoom lens includes, in order from the object side, a first lens unit having a negative refractive power, a second lens unit having a positive refractive power, and a third lens unit having a positive refractive power. The first lens unit includes a negative lens and a positive lens. The zoom lens satisfies the following conditional expression (1):;Σd13/ft<0.4 (1);where Σd13 is the total sum of the thickness of the lenses included in the first to third lens units of the zoom lens on the optical axis, and ft is the focal length of the entire zoom lens system at the telephoto end. |
| 申请公布号 |
US2015009577(A1) |
申请公布日期 |
2015.01.08 |
| 申请号 |
US201414495231 |
申请日期 |
2014.09.24 |
| 申请人 |
OLYMPUS IMAGING CORP. |
发明人 |
Ueda Minoru;Watanabe Masahito;Imamura Masahiro;Miki Mayu |
| 分类号 |
G02B15/177;G02B13/04 |
主分类号 |
G02B15/177 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
1. A zoom lens comprising, in order from the object side:
a first lens unit having a negative refractive power; a second lens unit having a positive refractive power; and a third lens unit having a positive refractive power, wherein the first lens unit comprises a negative lens and a positive lens, a total number of moving lens units in the zoom lens is 3, a total number of lenses in the first lens unit is 2, and the zoom lens satisfies the following conditional expression (1):
Σd13/ft<0.4 (1)where Σd13 is the total sum of the thickness of the lenses included in the first to third lens units of the zoom lens on the optical axis, and ft is the focal length of the entire zoom lens system at the telephoto end. |
| 地址 |
Tokyo JP |
