Objective lens driving device

An objective lens driver comprising:

• a movable portion with an objective lens;
• at least four elastic supporting members being fixedly attached at first ends thereof to said movable portion while being vertically and horizontally arranged with respect to said objective lens;
• a fixed portion to which second ends of said elastic supporting members are fixedly attached;
• and
• damper cases provided at said fixed portion, in which damping material is being filled,
• wherein a portion of each case of said damper cases, at which said elastic supporting member is to be placed, is configured such that an inner side of said portion narrows in a focus direction, and an outer side thereof expands in said focus direction.

An objective lens driver comprising:

• a movable portion with an objective lens;
• at least four elastic supporting members being fixedly attached at first ends thereof to said movable portion while being vertically and horizontally arranged with respect to said objective lens;
• a fixed portion to which second ends of said elastic supporting members are fixedly attached;
• and
• damper cases provided at said fixed portion, in which a damping material is being filled,
• wherein when said movable portion is shifted in a radial direction, a first distance between a wall of each case of said damper cases and said elastic supporting members in a focus direction on a first side of said objective lens is different from a second distance between a wall of each case of said damper cases and said elastic supporting members in a focus direction on a second side of said objective lens.