| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a lens device with no necessity to carry out alignment again between the optical axis of a lens retained by a lens barrel and the optical axis of a mount ring when exchanging the mounting ring on the lens barrel. <P>SOLUTION: The lens device attached to a camera includes: the lens barrel retaining a lens system; a cylindrical fitting section connecting with the camera; and a flange section provided around the fitting section. In addition the lens device is provided with: the mounting ring attached to the lens barrel; a plurality of pins provided on the lens barrel for aligning the central axis of the mounting ring to the optical axis of the lens system; a plurality of through-holes formed on the flange section; a positioning ring having a smaller external diameter than the hole diameter of the through-holes with an aperture for fitting in the pins; and a fixing member for fixing the positioning ring inside the though holes. In this case, positioning of the lens barrel and the mounting ring is carried out by restricting the pins by the aperture in the positioning ring which is fixed by the fixing member in a state with the mounting ring aligned. <P>COPYRIGHT: (C)2012,JPO&INPIT |
