| 发明名称 |
IMAGING LENS AND IMAGING APPARATUS |
| 摘要 |
An imaging lens includes a first lens group having positive refractive power, a second lens group having negative refractive power, and a third lens group having positive refractive power. The first to third lens groups are arranged in order from an object side toward an image side. A focusing operation is performed through allowing the second lens group to travel along an optical axis. The following conditional expressions are satisfied,;0.40<Da/TL<0.65 (1);0.90<f3/f<3.50 (2);where Da is an on-axial distance from an object-sided surface of the second lens group to an image-sided surface of the third lens group in an infinite focus state, TL is an on-axial total length of the imaging lens, f3 is a focal length of the third lens group, and f is a total focal length of the imaging lens in the infinite focus state. |
| 申请公布号 |
US2015092100(A1) |
申请公布日期 |
2015.04.02 |
| 申请号 |
US201414465123 |
申请日期 |
2014.08.21 |
| 申请人 |
Sony Corporation |
发明人 |
Chen Yonghua;Miyagawa Naoki |
| 分类号 |
G02B15/14;H04N5/232 |
主分类号 |
G02B15/14 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
1. An imaging lens comprising:
a first lens group having positive refractive power; a second lens group having negative refractive power; and a third lens group having positive refractive power, the first to third lens groups being arranged in order from an object side toward an image side, wherein a focusing operation is performed through allowing the second lens group to travel along an optical axis, and the following conditional expressions are satisfied,
0.40<Da/TL<0.65 (1)0.90<f3/f<3.50 (2) where Da is an on-axial distance from an object-sided surface of the second lens group to an image-sided surface of the third lens group in an infinite focus state, TL is an on-axial total length of the imaging lens, f3 is a focal length of the third lens group, and f is a total focal length of the imaging lens in the infinite focus state. |
| 地址 |
Tokyo JP |
