| 摘要 |
PROBLEM TO BE SOLVED: To make deviation between an optical axis of a light pickup and an optical axis of an objective lens minute although feed resolution is coarse. SOLUTION: At least a housing 3 on which the objective lens 1 is mounted and which is supported freely movably in about straight line and a coarse feed mechanism 6 are buffering-joined via a viscoelastic transfer means 12. Since motion of a driving source is converted to a housing motion by the viscoelastic transfer means, the housing motion is smooth even when feed resolution of the driving source is coarse and thereby deviation between the housing and the objective lens driven by a fine adjustment means can be made to be minute.
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