REFLECTION TYPE PROJECTION DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a reflection type projection device that is entirely made small and compact and is reduced in weight by simplification of a basic structure, improves the storage property, installation property, handleability, and low cost performance, improves the wide angle performance while securing a sufficient image quality, and can flexibly handle various applications.SOLUTION: An optical processing system S includes a refracting optical system 3 disposed on the rear side in the optical axis direction (optical travel direction) Fs and a reflecting optical system 4 disposed on the front side in the optical axis direction Fs. The refracting optical system 3 and reflecting optical system 4 are formed of a coaxial system. The reflecting optical system 4 includes one or more refractive surface units La and Lb through which the light coming from the refracting optical system 3 passes, and one reflective surface unit Lr on which the light coming from the refractive surface units La and Lb is reflected. As the optical condition of the reflecting optical system 4, -0.5