公开(公告)号：US06434331B1

公开(公告)日：2002-08-13

申请号：US09507182

申请日：2000-02-18

申请人： Nobuharu Araoka ,  Takeshi Ito ,  Shigeo Hayashi

发明人： Nobuharu Araoka ,  Takeshi Ito ,  Shigeo Hayashi

IPC分类号： G03B1700

CPC分类号： G03B17/00

摘要： A lens barrel in accordance with the present invention has a stationary frame, a cam frame, a first lens frame, and a second lens frame. The cam frame has an external cam formed on the external surface thereof and an internal cam formed on the internal surface thereof. The first lens frame is freely movable in directions along an optical axis relative to the stationary frame when driven by the external cam of the cam frame. The second lens frame can freely slide in the optical-axis directions with its rotation restrained by the internal surface of the first lens frame when driven by the internal cam of the cam frame.

摘要翻译： 根据本发明的镜筒具有固定框架，凸轮框架，第一透镜框架和第二透镜框架。 凸轮框架具有形成在其外表面上的外部凸轮和形成在其内表面上的内部凸轮。 当由凸轮框架的外部凸轮驱动时，第一透镜框架可相对于静止框架沿着光轴方向自由移动。 当由凸轮框架的内部凸轮驱动时，第二透镜框架可以在光轴方向上自由地滑动，其旋转被第一透镜框架的内表面限制。