Patent ID: 8717683
Filing Date: 2014-05-06
Classification: G02B,H04N

Abstract:
1. An image pickup apparatus comprising: a zoom lens; and an image pickup element; wherein the image pickup element comprises an image pickup surface which receives an image which has been formed by the zoom lens, and which converts the image received, to an electric signal, and the zoom lens comprises an object-side lens unit which comprises a prism having a reflecting surface which reflects an optical path, an object-side sub lens unit having a negative refractive power, which is disposed on an object side than the prism, an aperture stop which is disposed on an image side than the object-side lens unit, and which restricts an axial light beam, a first zoom lens unit having a positive refractive power, which is disposed on the image side than the aperture stop, and which is moved to carry out zooming, to come closer to the aperture stop, at the telephoto end than at the wide angle end, and a position of the object-side lens unit is fixed at the time of zooming from the wide angle end to the telephoto end, and the object-side lens unit is a lens unit which is disposed nearest to the object side, and when a surface which includes an incident-light axis of light incident on the reflecting surface and a reflected-light axis of light upon being reflected at the reflecting surface is defined as a reference surface, and a side of the incident-light axis with respect to the reflected-light axis is defined as a front-surface side, and a side opposite to the front-surface side with respect to an optical axis after the reflection is defined as a rear-surface side, the image pickup element has an effective image pickup area of a rectangular shape having a short side and a long side, and the short side of the effective image pickup area is parallel to the reference surface, and the first zoom lens unit has an object-side lens which is disposed nearest to the aperture stop in the first zoom lens unit, and the object-side lens in the first zoom lens unit has an outer shape which is a non-circular shape of which, the front-surface side and the rear-surface side are cut partly, and an outer size of the object-side lens, in a direction from an optical axis toward the front-surface side is smaller than an outer size of the object-side lens in a direction from the optical axis toward the rear-surface side, and when an object having a uniform brightness is captured, the zoom lens, at any state from the wide angle end to the telephoto end, satisfies the following conditional expression (A), and furthermore, the image pickup apparatus comprises a shading correction parameter storage section which stores a shading correction parameter which differs at the front-surface side and the rear-surface side with respect to a center of an image, which is for correcting asymmetric shading at the front-surface side and the rear-surface side of the zoom lens, and a shading correction section which carries out correction operation of an image which has been picked up by the image pickup element, based on the shading correction parameter stored in the shading correction parameter storage section, where, EV EV