Patent ID: 7114818

Claim:
An optical system comprising: a stop, an object-side reflecting surface located on an object side of the optical system with respect to said stop, an image-side reflecting surface located on an image side of the optical system with respect to said stop, and an image pickup device, wherein: said object-side reflecting surface and said image-side reflecting surface are each located obliquely to an optical axis of the optical system, said object-side reflecting surface and said image-side reflecting surface are located such that a reference plane for said object-side reflecting surface and a reference plane for said image-side reflecting surface cross at any angle wherein when an axial chief ray is defined by a light ray propagating from a center of an object to a center of an image through a center of the stop, the reference plane for each reflecting surface is given by a plane defined by an entrance-side axial chief ray and a reflection-side axial chief ray regarding each reflecting surface, and said object-side reflecting surface and said image-side reflecting surface have a rotationally asymmetric aspheric shape.