Abstract
Directionally coupled vibration, referred to as "cross action" was analyzed to improve positioning accuracy in CD and CD-ROM optical pick-up systems having two-dimensional motion, i. e., autofocus and tracking directions. Cross action is defined as the secondary movement of the pick-up in the tracking direction when actuated to move in the autofocus direction. The main cause of cross action is found to be elastic resonance of the thin plate in the pick-up support. Assembly error is also found to amplify cross action. Optimum values for the support configuration were obtained by FEM and lumped mass vibration analyses.
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