| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a zoom lens barrel capable of securing a prescribed movement amount of a lens group even when subjected to dimension limit on the side of an image face based on a design limit and capable of responding to various requests of a customer.SOLUTION: A small-diameter cam unit 22 is connected to a third lens group 3G located on the side of an image face among the lens group stored inside a first straight advance barrel 6. When a first cam barrel 8 is rotated, a second lens group 2G and a third lens group 3G move to the optical axis direction. A connecting ring 34 is rotated in synchronization with a rotation of the first cam barrel 8, and in association with this rotation, the second cam barrel 26 is rotated. Thereby, a fourth lens group 4G, a fifth lens group 5G, and a sixth lens group 6G move inside a second straight advance barrel 24. A movement amount of the lens group inside the second straight advance barrel 24 is added with the movement amount of the third lens group G3.</p> |
