| 摘要 |
An image-erecting viewing optical system includes a first prism having an incident surface and at least two reflection surfaces, a front lens group of an objective optical system, a second prism having an incident surface and at least two reflection surfaces, a rear lens group of the objective optical system, a field stop, and an eyepiece optical system, in this order from the object. One reflection surface of the first or second prism includes a roof-mirror surface. The following conditions are satisfied:whereintheta designates an angle between the incident surface and the first reflection surface of the first prism;omega designates a real field-of-view omega (half amount);omega' designates an angle between a light ray of a real field-of-view omega (half amount) and the optical axis within the first prism; andn designates the refractive index of the first prism.
|
