| 发明名称 |
OBJECTIVE OPTICAL SYSTEM |
| 摘要 |
An objective optical system includes in order from an object side a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a third lens group having a positive refractive power, wherein focusing is carried out by moving the second lens group with respect to a change in an object-point distance, and the following conditional expressions (2) and (3) are satisfied:;3<|β| (2), and;60°<ω (3),where,β denotes a lateral magnification of the overall objective optical system at the time of focusing to an object point at a close distance, andω denotes the maximum half angle of view at the time of focusing to an object point at a long distance. |
| 申请公布号 |
US2017038570(A1) |
申请公布日期 |
2017.02.09 |
| 申请号 |
US201615332140 |
申请日期 |
2016.10.24 |
| 申请人 |
OLYMPUS CORPORATION |
发明人 |
TAKATO Hideyasu |
| 分类号 |
G02B15/22;G02B13/00;A61B1/00;G02B23/24 |
主分类号 |
G02B15/22 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
1. An objective optical system, comprising in order from an object side;
a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a third lens group having a positive refractive power, wherein focusing is carried out by moving the second lens group with respect to a change in an object-point distance, and the following conditional expressions (2) and (3) are satisfied:
3<|β| (2), and60°<ω (3), where, β denotes a lateral magnification of the overall objective optical system at the time of focusing to an object point at a close distance, and ω denotes the maximum half angle of view at the time of focusing to an object point at a long distance. |
| 地址 |
Tokyo JP |
