To avoid optical axial deviation in an objective lens due to high order bend vibration and improving reliability by constituting so that the optical axis of the objective lens is placed on the position becoming a node of vibration of a lens holder fixing the objective lens.
This actuator is constituted so that a length of two pairs of wires 16 is made 6.6mm, and a crossing angle of these two pairs of wires 16 is made 150°, and further, a distance between a crossing I and the optical axis O of the objective lens 6 is made 7.8mm. In such a manner, by setting three elements of the length of the wire 16, the crossing angle and the distance between the crossing I and the optical axis O of the objective lens 6, the node 24 of the vibration of the lens holder 9 is made to coincide with the position of the optical axis O of the objective lens 6. Thus, when the position of the objective lens 6 in the track direction is adjusted, the phenomenon that the lens optical axis causes positional deviation is avoided.
OTSUKA SHINICHI
SHIMOKAWA SATOSHI
Next Patent: RECORDING/REPRODUCING DEVICE AND METHOD THEREOF