| 发明名称 |
EYEPIECE OPTICAL SYSTEM AND ELECTRONIC APPARATUS |
| 摘要 |
An eyepiece optical system includes: a first lens having a biconvex shape in optical axis center and having positive refractive power; a second lens having negative refractive power; a third lens having positive refractive power; and a fourth lens having positive refractive power. The first to fourth lenses are arranged in order from an image to be observed. The following conditional expression is satisfied,;0.47<f3/f4<3.00 (1);where f3 is a focal length of the third lens, and f4 is a focal length of the fourth lens. |
| 申请公布号 |
US2015103411(A1) |
申请公布日期 |
2015.04.16 |
| 申请号 |
US201414465170 |
申请日期 |
2014.08.21 |
| 申请人 |
Sony Corporation |
发明人 |
Katagata Kenta |
| 分类号 |
G02B25/00 |
主分类号 |
G02B25/00 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
1. An eyepiece optical system comprising:
a first lens having a biconvex shape in optical axis center and having positive refractive power; a second lens having negative refractive power; a third lens having positive refractive power; and a fourth lens having positive refractive power, the first to fourth lenses being arranged in order from an image to be observed, wherein the following conditional expression is satisfied,
0.47<f3/f4<3.00 (1) where f3 is a focal length of the third lens, and f4 is a focal length of the fourth lens. |
| 地址 |
Tokyo JP |
