| 摘要 |
PURPOSE:To suppress the vibration of a lens by dynamic balance and to obtain excellent tracking characteristics by arranging plural spring members so as to intersect them at right angles on their intermediate point and making the centroids of all movable parts coincide with the rectangularly intersecting point of the spring members. CONSTITUTION:Since the width direction of a leaf spring is fitted so as to be along a focus direction to suppress the movement of a tracking spring member 11a in the focus direction F and to easily bend the member 11a in a tracking direction T, the member 11a has strong structure against the vibration of the focus direction F. Even if a 1st movable part is oscillated in the focus direction F, a 2nd moving part 9 can be moved only in the tracking direction T without being oscillated. Since the centroids of all movable parts of the objective lens driving device coincide with the rectangularly intersecting point of plural tracking spring members 11a, 11b, all movable parts can be fixed and the movable parts which is ordinarily constituted of bearings or the like can be constituted of the leaf springs. Consequently, an excess resonance phenomenon can be suppressed and excellent tracking characteristics can be obtained.
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