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US 7,116,901 B2Granted
Zoom finder drive mechanisms
AssigneesAsia Optical Co., Inc., OPTEK Corporation
InventorTakamasa Sakamoto
Life of this patent
Estimating the term…
Abstract
A zoom finder drive mechanism, driven only when taking a picture. When a lens barrel is in a collapsed position, the cam-follower pin of a rotary barrel does not abut at an end of a protrusion of a finder cam barrel such that a first and second movable finder lenses are idle. When taking a picture, the cam-follower of the rotary barrel is abutted at the end of the protrusion of the finder cam barrel such that the first and second movable finder lenses are driven.
Claims4
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.
5 more elements
Dependencies are inferred from the claim text.