Patent ID: 7116901

Claim:
A zoom finder drive mechanism, driven by movement of a zoom lens barrel of an optical photography system, comprising: a fixing barrel, comprising: at least one first cam groove, formed on an inner circumference thereof and having a bottom surface defined thereon; and a hole, formed on an outer circumference thereof and connecting to a part of the first cam groove via the bottom surface of the first cam groove; a rotary barrel, comprising at least one first cam-follower formed on an outer circumference thereof and engaged with the first cam groove of the fixing barrel, rotating about a central axis parallel to an optical axis of the optical photography system; a finder cam barrel, disposed on the outer circumference of the fixing barrel, comprising a second cam groove formed on an outer circumference thereof, and rotating by contacting the first cam-follower of the rotary barrel via the hole of the fixing barrel; and a finder lens drive member, comprising a second cam-follower engaged with the second cam groove so as to drive at least a portion of a finder lens group.