| 摘要 |
PROBLEM TO BE SOLVED: To provide a projection optical system that can display a sufficiently large enlarged video on a screen with a short projection distance, while achieving a reduction in size and cost.SOLUTION: A projection optical system projects an image displayed on an image display element D arranged on a reduction side conjugate surface as an enlarged image on an enlarged side conjugate surface, includes a dioptric system and reflection optical system R having a negative power in order from the reduction side, and satisfies the following conditional expression (1): (ZL+ZD)×Ymin/Ymax≤3.2. |
