| 发明名称 |
Telephoto Lens and Image Pickup Apparatus Using the Same |
| 摘要 |
A telephoto lens includes in order from an object side, a first unit having a positive refractive power, a second unit having a negative refractive power, and a third unit having a positive refractive power, and a focusing from an infinite object point to an object point at a short distance is carried out by moving the second unit toward an image side, and the following conditional expression (17) is satisfied:;0.2<Y2/Y1a<0.32 (17)where,Y2 denotes a maximum height of an axial light ray on a surface of incidence of the second lens unit, andY1a denotes a maximum height of an axial light ray on a surface of incidence of the first lens unit. |
| 申请公布号 |
US2016109690(A1) |
申请公布日期 |
2016.04.21 |
| 申请号 |
US201514842247 |
申请日期 |
2015.09.01 |
| 申请人 |
OLYMPUS CORPORATION |
发明人 |
Ogata Yasuji;Naito Akiko;Hara Kento |
| 分类号 |
G02B13/02;G03B17/56;H04N5/225;G02B27/64 |
主分类号 |
G02B13/02 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
1. A telephoto lens comprising in order from an object side:
a first unit having a positive refractive power; a second unit having a negative refractive power; and a third unit having a positive refractive power, wherein a focusing from an infinite object point to an object point at a short distance is carried out by moving the second unit toward an image side, and the following conditional expression (17) is satisfied:
0.2<Y2/Y1a<0.32 (17), where, Y2 denotes a maximum height of an axial light ray on a surface of incidence of the second unit, and Y1a denotes a maximum height of an axial light ray on a surface of incidence of the first unit. |
| 地址 |
Tokyo JP |
