Patent ID: 8363129
Filing Date: 2013-01-29
Classification: G02B

Abstract:
1. An imaging device comprising: an aberration control optical system comprising: an aperture stop controlling the amount of light passed through the aberration control optical system; an imaging element operable for imaging a object image passed through the aberration control optical system and the aperture stop, wherein a first angle formed by an optical axis and a light beam passed through the aberration control optical system is smaller than a second angle formed by the optical axis and a light beam from an outermost peripheral part of the lens defining an image side numerical aperture of the aberration control optical system without the aberration control unit, wherein a chief light ray does not intersect an Fno ray in a space between the aberration control unit and the aperture stop, where an Fno ray represents a light touching the aperture stop among lights which are focused to an optical axis; and wherein the following relationship is satisfied: where Um is a maximum of angles formed by the light beam, and K is an angle formed by a limit incident light beam at which the imaging element tolerates an influence of shading and the optical axis.