| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a lens unit capable of easily adjusting image point displacement during zooming by a simple and compact configuration. <P>SOLUTION: A correction cylinder 4, an anti-rotation pin 6, etc. are provided as a focus correction mechanism C1. The cylindrical correction cylinder 4 can be operated from the outside of first and second rotating cylinders 1 and 2 and is disposed between the first and second rotating cylinders 1 and 2 on the same axis as an optical axis AX, and the anti-rotation pin 6 is disposed between the first and second rotating cylinders 1 and 2 so as not to allow relative rotation of the first and second rotating cylinders 1 and 2. The correction cylinder 4 has screw parts 4a and 4b on both sides in the direction of the optical axis AX, and one screw part 4b out of them is constituted as a reverse screw. The first rotating cylinder 1 is provided with a screw part 1a to be engaged with one screw part 4a of the correction cylinder 4, and the second rotating cylinder 2 is provided with a screw part 2a to be engaged with the other screw part 4b of the correction cylinder 4. <P>COPYRIGHT: (C)2013,JPO&INPIT |
