| 发明名称 |
Zoom Lens and Image Pickup Apparatus Using the Same |
| 摘要 |
A zoom lens includes in order from an object side to an image side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power, and a fourth lens unit having a negative refractive power, and includes an aperture stop which is disposed between the second lens unit and the fourth lens unit, and the first lens unit includes a negative lens and a plurality of positive lenses, and at the time of zooming from a wide angle end to a telephoto end, a distance between the first lens unit and the second lens unit widens, a distance between the second lens unit and the third lens unit narrows, and a distance between the third lens unit and the fourth lens unit changes, and the zoom lens satisfies predetermined conditional expressions. |
| 申请公布号 |
US2014211074(A1) |
申请公布日期 |
2014.07.31 |
| 申请号 |
US201314054225 |
申请日期 |
2013.10.15 |
| 申请人 |
OLYMPUS IMAGING CORP. ;OLYMPUS CORPORATION |
发明人 |
Mimura Takayuki;Imamura Masahiro;Amanai Takahiro |
| 分类号 |
G02B15/16 |
主分类号 |
G02B15/16 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
1. A zoom lens comprising in order from an object side to an image side:
a first lens unit having a positive refractive power; a second lens unit having a negative refractive power; a third lens unit having a positive refractive power; and a fourth lens unit having a negative refractive power, wherein the zoom lens further includes an aperture stop which is disposed between the second lens unit and the fourth lens unit, and the first lens unit includes a negative lens and a plurality of positive lenses, and at the time of zooming from a wide angle end to a telephoto end, a distance between the first lens unit and the second lens unit widens, a distance between the second lens unit and the third lens unit narrows, and a distance between the third lens unit and the fourth lens unit changes, and the following conditional expressions (1) and (2) are satisfied
2.85<ft/DG1ASt<7.4 0 (1)0.2<DASIMt/ft<0.4 0 (2) where, ft denotes a focal length of the overall zoom lens system at the telephoto end, DG1ASt denotes a distance on an optical axis from an object-side surface of a lens nearest to the object side in the first lens unit up to the aperture stop, at the telephoto end, and DASIMt denotes a distance on the optical axis from the aperture stop up to an image, at the telephoto end. |
| 地址 |
Tokyo JP |
