| 摘要 |
PROBLEM TO BE SOLVED: To reduce a reaction force transmitted from a focus drive source to a pick up chassis, in a vibration control support device for a photo disc device. SOLUTION: A lens holder 1 is servo-controlled by a plurality of focus drive sources consisting of a coil 4 and a yoke 7 with a magnet 6. Coils 4a and 4b are fixed at a lens holder 1 and yokes 6a and 6b are fixed at pick up pusher 5 through elastic support members 11a and 11b, such as a leaf spring. When the lengths of the elastic support members 11a and 11b are selected to L1 and L2, respectively, and form an unequal length, in reaction force-frequency characteristics, the two resonance peaks of a reaction force arise but the maximum value of the peak is reduced. The maximum value of a reaction force at the resonance frequency of the elastic support member is reduced and an excellent focus correction action is practicable even in the vicinity of the resonance frequency of the elasticity-supporting member.
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