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    • 60. 发明授权
    • Collapsible lens barrel and optical instrument using the same
    • 可折叠镜筒和光学仪器使用相同
    • US07907842B2
    • 2011-03-15
    • US12683784
    • 2010-01-07
    • Naoto YumikiYutaka Takahashi
    • Naoto YumikiYutaka Takahashi
    • G03B17/00
    • G02B7/102
    • A collapsible lens barrel includes a first holding frame (2) for holding a first lens group (L1), a second holding frame (5) for holding a second lens group (L2) that is disposed on an image plane side with respect to the first lens group (L1), an actuator (6) for moving the second holding frame 5 in an optical axis direction, and a tubular cam frame (17) including a plurality of cam grooves that are formed at substantially equal intervals around a circumferential direction for moving the first holding frame (2) in the optical axis direction. The actuator (6) is attached to a portion in the cam frame (17) where the cam grooves are not formed. The first lens group (L1) is moved using the cam grooves, and the second lens group (L2) is moved using the actuator (6), so that a faster zooming speed and a lower zooming noise can be achieved.
    • 可折叠透镜镜筒包括用于保持第一透镜组(L1)的第一保持框架(2),用于保持第二透镜组(L2)的第二保持框架(5),所述第二透镜组(L2)相对于 第一透镜组(L1),用于沿光轴方向移动第二保持框架5的致动器(6)和包括多个凸轮槽的管状凸轮框架(17),所述多个凸轮槽围绕圆周方向以大致相等的间隔形成 用于沿光轴方向移动第一保持框架(2)。 致动器(6)附接到凸轮框架(17)中未形成凸轮槽的部分。 使用凸轮槽移动第一透镜组(L1),并且使用致动器(6)移动第二透镜组(L2),从而可以实现更快的变焦速度和更低的变焦噪声。