| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a structure facilitating attachment and detachment of a lens adaptor installed with an accessory lens to and from an imaging apparatus body, matching the optical axis of the accessory lens installed to the lens adaptor to that of a lens group of an imaging optical system as much as possible, and preventing breakage of the imaging apparatus even if external force is applied to the lens adaptor by preventing the force from being transmitted to a lens barrel unit having a photographic optical system. <P>SOLUTION: The accessory lens unit to be detachably attached to an imaging apparatus including a lens barrel unit including an imaging optical system and an imaging device, and a facing member formed to expose the lens barrel unit, includes: an engagement part for determining positions in an optical axial direction and in a direction orthogonal to the optical axis by being directly engaged with the lens barrel unit; and a contact part which does not contact with the facing member when no external force is applied to the accessory lens unit, and contacts with the facing member when external force is applied to the accessory lens unit. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
