Supporting mechanism for allowing an object to make a pseudo-translational motion

An objective-lens driving device comprising:

• a lens holder to which a focusing-direction driving coil for driving the objective lens in a focusing direction is fixed, the lens holder supporting the objective lens;
• a magnetic circuit for generating a driving force that drives the lens holder by interaction with an electromagnetic force that is generated by the focusing-direction driving coil;
• a base member for forming a base that supports the lens holder and the magnetic circuit;
• a magnetic-circuit supporting section for supporting the magnetic circuit so that the magnetic circuit is allowed to freely make a pseudo-translational motion in the focusing direction, the magnetic-circuit support section being constituted of two plate members that are placed in such directions as to make a right angle with each other, each plate member having a first end and a second end, the two plate members being fixed onto the same plane of the base member at the respective first ends that are farther from each other, the magnetic circuit being fixed to the respective second ends that are closer to each other;
• and
• a lens-holder supporting mechanism for supporting the lens holder above the base member so that one part of the magnetic circuit is placed inside the focusing-direction driving coil and the lens holder is allowed to freely move in the focusing direction.

An objective-lens driving device comprising:

• a lens holder to which a focusing-direction driving coil for driving the objective lens in a focusing direction is fixed, the lens holder supporting the objective lens;
• a base member for forming a base that supports the lens holder;
• a magnetic circuit for generating a driving force that drives the lens holder by interaction with an electromagnetic force that is generated by a focusing-direction driving coil, the magnetic circuit being fixed to the base member;
• a lens-holder supporting section for supporting the lens holder above the base member so that one part of the magnetic circuit is placed inside the focusing-direction driving coil and the lens holder is allowed to freely make a translational motion in the focusing direction, the lens-holder supporting section being constituted of two plate members that are placed in such directions as to make a right angle with each other, each plate member having a first end and a second end, the two plate members being fixed onto the same plane of the base member at the respective first ends that are farther from each other, the lens holder being fixed to the respective second ends that are closer to each other.