Patent ID: 6084715
Filing Date: 2000-07-04
Classification: A61B,G02B,H04N

Abstract:
An image-forming optical system for forming an image of an object, said image-forming optical system comprising:a stop;an object-side reflecting surface placed closer to an object side of said image-forming optical system than said stop, said object-side reflecting surface being a reflecting surface with an aspherical surface configuration that gives a power to a light beam when reflecting it;an image-side reflecting surface placed closer to an image side of said image-forming optical system than said stop, said image-side reflecting surface being a reflecting surface with an aspherical surface configuration that gives a power to a light beam when reflecting it; anda low-pass filter for cutting off a high-frequency component, said low-pass filter being provided between said object-side reflecting surface and said image-side reflecting surface.