| 摘要 |
A voice coil type lens drive assembly for adjusting the focus of a lens is provided which does not require a higher lens position control accuracy than necessary and which is hard to cause an offset during lens movement and is applicable also to a downsized lens drive assembly. The voice coil type lens drive assembly comprises a lower base 1 , a pair of electrically conductive springs 2 disposed on the base 1 , a metallic yoke 6 disposed on the electrically conductive springs 2 , magnets 5 mounted within the yoke 6 , a movable unit M 1 inserted into the yoke 6 in opposition to the magnets 6 , a leaf spring 7 disposed on the yoke 6 , and an upper cover frame 8 coupled to the base 1 while being superimposed on the leaf spring 7 , the electrically conductive springs 2 each comprising an outer spring body 2 b, a thin semicircular spring piece 2 a formed inside the spring body 2 b, and a spring wire, the spring wire comprising a curvilinear portion connected at one end to the inner spring piece 2 a and repeating U-turn and another curvilinear portion connected at an opposite end to the outer spring body 2 b and repeating U-turn, the leaf spring 7 comprising a thin quadrangular spring frame 7 a located on an outer edge side, a thin circular spring ring 7 b located on an inner edge side, and a spring wire, the spring wire comprising a curvilinear portion connected at one end to the spring ring 7 b and repeating U-turn and another curvilinear portion connected at an opposite end to the spring frame 7 a and repeating U-turn.
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