| 摘要 |
PROBLEM TO BE SOLVED: To provide a variable power lens barrel, equipped with a lens group driving mechanism for power variation and focusing having a structure such that is less likely to be restricted by the internal space of the lens barrel. SOLUTION: The variable power lens barrel includes: a linear guide ring which guides support frames of at least two lens groups constituting an imaging optical system, to linearly move in the optical axis direction; first and second lens group drive rings which rotate to move the first and second lens group support frames in predetermined locus, in the optical axis direction relative to the linear guide ring; and a drive ring coupling means which couples the first and second lens group drive rings with each other, to prevent relative rotation therebetween while allowing relative movement therebetween in the optical axis direction. The first and second lens group drive rings are rotated integrally, without changing the relative position in the optical axis direction, when a power-variation operating means is operated, and only one lens group drive ring is moved in the optical axis direction without accompanying rotation, when a focus operating means is operated. COPYRIGHT: (C)2010,JPO&INPIT |
