| 摘要 |
A lens holder ( 1 ) is so supported that the lens holder ( 1 ) is movable along a supporting shaft ( 6 ) in parallel to an optical axis of the object lens ( 3 ), and rotatable about the supporting shaft ( 6 ). Magnets ( 41, 42 ) are mounted on the lens holder ( 1 ). Focusing coils ( 71, 72 ) and tracking coils ( 81, 82 ) having sides facing the magnets ( 41, 42 ) are mounted on a base ( 5 ) on which the supporting shaft ( 6 ) is planted. Yokes ( 91, 92 ) are so provided that the yokes ( 91, 92 ) and the magnets ( 41, 42 ) respectively sandwich the focusing coils ( 71, 72 ) and the tracking coils ( 81, 82 ). The yokes ( 91, 92 ) have facing portions ( 91 a , 92 a) that face respective magnetic poles of the magnets ( 41, 42 ) and extending portions ( 91 b , 92 b) extending in the directions away from the magnets ( 41, 42 ).
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