| 摘要 |
PURPOSE:To simplify structure, to move a main lens holder smoothly and securely, and to facilitate focus varying operation by moving forth and back the main lens holder through a crank mechanism. CONSTITUTION:The rotation of a gear T1 fixed on the rotating shaft 36a of the changeover motor for a gear mechanism 38A is reduced in speed through gears T2 and T3, and T4 and T5 coupled together in one body and transmitted to a T6. The rotation of the T6 is reduced in speed through gears T7 and T8A, and T9A and T10A coupled together in one body and transmitted to a sector gear T11A. The T11A operates as a rotating member and is coupled pivotally with the holder for a main lens ML by a lens driving link 78A together with a movable light shield tube 32 which moves forth and back in one body to constitute a mechanism which include the T11A as a crank, so that the main lens holder is moved forth and back by this crank mechanism. Further, the rotation of the motor 36 is transmitted to the T11A while reduced in speed.
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