| 摘要 |
PROBLEM TO BE SOLVED: To obtain a catadioptric optical system that has various aberrations excellently corrected over an entire visible light region, has a high resolving power over a broad imaging region and is excellent in telecentricity.SOLUTION: An imaging device having a catadioptric optical system and an image pickup element comprises: a catadioptric part in which the catadioptric optical system condenses a ray flux from an object to form an intermediate image of the object; a refraction part that forms the intermediate image on an imaging plane; an intermediate field lens that is arranged between the catadioptric part and the refraction part, and guides the ray flux from the catadioptric part to the refraction part; and an image side field lens that is arranged between the refraction part and the imaging plane, and guides the ray flux from the refraction part to an image side. The intermediate lens and the image side filed lens have positive and negative lenses, and an axial ray flux and an outermost off-axis ray flux pass through a mutually different region in a lens surface facing the adjacent positive lens and negative lens of the intermediate field lens and in a lens surface facing the adjacent positive lens and negative lens of the image side field lens, respectively. |
