| 摘要 |
PROBLEM TO BE SOLVED: To provide a reflection photographic lens in which a ring-shaped blur arising from a defocus is not generated.SOLUTION: A first reflection mirror (CM1), a second reflection mirror (CM2), a third reflection mirror (CM3) and a fourth reflection mirror (CM4) are arranged so that an object image is formed on a prescribed image plane (IM) after light from an object is sequentially reflected by the first reflection mirror (CM1), the second reflection mirror (CM2), the third reflection mirror (CM3) and the fourth reflection mirror (CM4). The first reflection mirror to the fourth reflection mirror have a rotationally asymmetry aspherical shape reflection surface and are configured to be symmetric with respect to a reference plane (a YZ plane) including a first reference axis (AXe) defined by a normal line passing a center of the image plane and orthogonal to the image plane. The first reflection mirror has a concave surface directed at an incident direction of light. The first reflection mirror and the second reflection mirror are tilted in the same direction with respect to an orthogonal plane (an XY plane) orthogonal to the first reference axis, and the third reflection mirror and the fourth reflection mirror are tilted in a direction reverse to the first reflection mirror with respect to the orthogonal plane. The second reflection mirror and the third reflection mirror are eccentrically arranged on the same side with respect to the first reflection mirror within the reference plane. |
