| 发明名称 |
IMAGING OPTICAL SYSTEM, CAMERA DEVICE, AND PORTABLE INFORMATION TERMINAL APPARATUS |
| 摘要 |
An imaging optical system includes, in order from the object side, a first lens group, an aperture stop, and a second lens group. The first lens group includes, in order from the object side, a negative lens of a biconcave shape and a positive meniscus lens with a convex surface facing the object side. The second lens group includes, in order from the object side, a second-front lens group and a second-rear lens group, the second-rear lens group having a positive refractive power as a whole. The second-front lens group includes a cemented lens formed by combing a negative lens with a concave surface facing the object side and a positive lens. |
| 申请公布号 |
US2017023777(A1) |
申请公布日期 |
2017.01.26 |
| 申请号 |
US201615195051 |
申请日期 |
2016.06.28 |
| 申请人 |
NAKAYAMA Takahiro |
发明人 |
NAKAYAMA Takahiro |
| 分类号 |
G02B13/04;G02B13/00;G02B9/60;G02B9/34 |
主分类号 |
G02B13/04 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
1. An imaging optical system comprising, in order from an object side:
a first lens group; an aperture stop; and a second lens group, the first lens group including, in order from the object side:
a negative lens of a biconcave shape; anda positive meniscus lens with a convex surface facing the object side, the second lens group including, in order from the object side:a second-front lens group; anda second-rear lens group having a positive refractive power as a whole, andwherein the second-front lens group includes a cemented lens formed by combining a negative lens with a concave surface facing the object side and a positive lens. |
| 地址 |
Kanagawa JP |
