| 摘要 |
PROBLEM TO BE SOLVED: To attain the simplification of a photographic lens barrel and a zoom lens mechanism, the miniaturization of equipment, the increase of assembling efficiency and the reduction of cost, in response to the requirement of demand for maintaining performance and moreover making the equipment smaller in size and easier to use than an advanced specification, depending on use conditions in optical equipment on which a zoom lens is mounted. SOLUTION: The simplified zoom lens mechanism adopts such a method that a main driving shaft 5 and a receiving shaft 6 are disposed in parallel to an optical axis L, respectively, a main driving body 8 integrated to the lens frame 4 of a moving lens group for focusing is slidably inserted into the main driving shaft 5, a receiving body 9 integrated to the lens frame of a moving lens group for zooming 3 is slidably inserted into the receiving shaft 6, and in two moving lens groups, the main driving body 8 holding the moving lens group for focusing has a main driving function and the receiving body 9 holding the moving lens group for zooming 3 is driven by the main driving body 8 by receiving the moving force of the moving lens group for focusing. A driving source for the moving lens group for zooming 3 is eliminated and a piezoelectric linear actuator is adapted to the driving source of the main driving body 8. COPYRIGHT: (C)2009,JPO&INPIT
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