Patent ID: 6704052
Filing Date: 2004-03-09
Classification: G02B,H04N

Abstract:
An image pickup optical system, comprising:an image formation optical system configured to form an object image, and an image pickup member adapted to receive said object image formed by said image formation optical system, wherein: said image formation optical system comprises at least one first prism member, said first prism member comprises, as optical acting surfaces, at least an entrance surface on which a ray bundle strikes, a reflection surface to reflect said ray bundle within said first prism member, and an exit surface through which said ray bundle leaves said first prism member, and at least said reflection surface and one of said entrance surface and said exit surface comprise a combined transmission and reflection surface constructed of the same surface, said reflection surface is constructed in a curved surface form that gives power to said ray bundle, said curved surface being constructed of a rotationally asymmetric curved surface having an action on correction of decentration aberration, and a fixing member configured to fix a position relation between at least said first prism member and said image pickup member, said fixing member being provided so as to prevent a deterioration in a capability of said rotationally asymmetric curved reflection surface of said first prism member of correcting decentration aberration due to a misalignment upon setting.