| 发明名称 |
EYEPIECE OPTICAL SYSTEM, OPTICAL APPARATUS AND METHOD FOR MANUFACTURING THE EYEPIECE OPTICAL SYSTEM |
| 摘要 |
Provided is an eyepiece optical system including, in order from an observation object (Ob): a first lens (L11) having positive refractive power; a second lens (L12) which has negative refractive power and of which an observation object (Ob) side lens surface is concave; and a third lens (L13) which has positive refractive power and of which an eye point (EP) side lens surface is convex. The third lens (L13) is fixed on the optical axis with respect to the observation object (Ob) when adjusting the diopter, and the following conditional expressions are satisfied:;0.65<R31/fe<1.30 (1);−0.80<(R32+R31)/(R32−R31)<−0.10 (2);where fe denotes a focal length of the eyepiece optical system, R31 denotes a radius of curvature of the observation object (Ob) side lens surface of the third lens (L13), and R32 denotes a radius of curvature of the eye point (EP) side lens surface of the third lens (L13). |
| 申请公布号 |
US2015212289(A1) |
申请公布日期 |
2015.07.30 |
| 申请号 |
US201514675790 |
申请日期 |
2015.04.01 |
| 申请人 |
Nikon Corporation |
发明人 |
Matsuo Taku |
| 分类号 |
G02B9/16;H04N5/225;H04N5/232;G02B13/00 |
主分类号 |
G02B9/16 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
1. An eyepiece optical system comprising, in order from an observation object:
a first lens having positive refractive power; a second lens which has negative refractive power and of which an observation object side lens surface is concave; and a third lens which has positive refractive power and of which an eye point side lens surface is convex, the third lens being fixed on an optical axis with respect to the observation object when adjusting a diopter, and the following conditional expressions being satisfied:
0.65<R31/fe<1.30−0.80<(R32+R31)/(R32−R31)<−0.10where fe denotes a focal length of the eyepiece optical system, R31 denotes a radius of curvature of an observation object side lens surface of the third lens, and R32 denotes a radius of curvature of the eye point side lens surface of the third lens. |
| 地址 |
Tokyo JP |
