| 发明名称 |
EYEPIECE LENS, OBSERVATION APPARATUS, AND IMAGING APPARATUS INCLUDING THE SAME |
| 摘要 |
One or more eyepiece lenses, one or more observation apparatuses and one or more imaging apparatuses are discussed herein. In at least one embodiment, an eyepiece lens comprises, in order from an object side to an observation side, a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens having a positive refractive power, a fourth lens having a negative refractive power, and a fifth lens having a positive refractive power, wherein a focal length of the fifth lens is shorter than a focal length of the third lens, and the focal length of the third lens is shorter than a focal length of the first lens. |
| 申请公布号 |
US2016062105(A1) |
申请公布日期 |
2016.03.03 |
| 申请号 |
US201514832953 |
申请日期 |
2015.08.21 |
| 申请人 |
CANON KABUSHIKI KAISHA |
发明人 |
Kawamura Jun;Miyazawa Nobuyuki;Inomoto Yu |
| 分类号 |
G02B25/00;H04N5/225;G02B13/00 |
主分类号 |
G02B25/00 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
1. An eyepiece lens, in order from an object side to an observation side, comprising:
a first lens having a positive refractive power; a second lens having a negative refractive power; a third lens having a positive refractive power; a fourth lens having a negative refractive power; and a fifth lens having a positive refractive power, wherein a focal length of the fifth lens is shorter than a focal length of the third lens, and the focal length of the third lens is shorter than a focal length of the first lens. |
| 地址 |
Tokyo JP |
