Patent ID: 10437027

Abstract:
The imaging optical system consists of first and second optical systems in order from a magnified side. The second optical system forms an image on an image display surface as an intermediate image. The first optical system forms the intermediate image on a magnified-side conjugate plane. A height H of a principal ray of light having a maximum angle of view becomes maximum on a lens surface of the whole system (having focal length f) on the most magnified side, among heights of principal rays of light having a maximum angle of view on respective lens surfaces, satisfying predetermined Conditional Expressions (1) and (2): 0.03<H×|f|/(L×I)<0.09  (1)0.35<I/dl  (2)Where L is an optical axis distance between lens surfaces on the most magnified and reduced sides, I is a reduced side maximum image height, and dl is a maximum air spacing on the optical axis within the system.