| 摘要 |
<p>The invention concerns a panoramic catadioptric optical system which is taking full-360° angle-of-view images from the surrounding scene or projecting images on the full-360° angles of view, and which has a compact size, reduced flare light and high resolving power. The optical system comprises a catoptric front unit (10) having two reflective surfaces (11,12) rotationally symmetric about a center axis (1), and a dioptric rear unit (20) that is rotationally symmetric about said center axis (1) and has positive power. The front unit (10) comprises a first reflective surface (11) located facing away from the entrance pupil (6Y) and a second reflective surface (12) located facing away from the first reflective surface (11). The entrance pupil (6Y) in a section including the center axis (1) is disposed between the outer periphery of the first reflective surface (11) and the outer periphery of the second reflective surface (12). A light beam (2) incident from afar travels through the front unit (10) and the rear unit (20) in order, and is imaged at an of-axis position of an image plane (30). In the section including the center axis (1), the entrance pupil (6Y) is positioned off the center axis (1), and in a section that is orthogonal to a plane including the center axis (1) and includes a center ray of that light beam, a entrance pupil (6X) is positioned on the center axis. The dioptric rear unit (20) comprises two lens groups.</p> |
