Patent ID: 7239461

Claim:
An object lens driving device, comprising: an object lens for collecting light on an information recording medium; a lens holder that holds said object lens; a base having a support shaft that supports said lens holder so that said lens holder is movable in a direction in parallel to an optical axis of said object lens, and rotatable about an axis parallel to said optical axis; a magnet mounted on said lens holder and magnetized in a direction substantially perpendicular to said optical axis, said magnet having a magnetic pole; a focusing coil mounted on said base, said focusing coil having a side facing said magnetic pole of said magnet and substantially perpendicular to said support shaft; a tracking coil mounted on said base, said tracking coil having a side facing said magnetic pole of said magnet and substantially parallel to said support shaft; and a yoke including a facing portion having a facing surface that faces said magnetic pole of said magnet, and an extending portion that extends from said facing portion in a direction away from said magnetic pole, wherein said side of said focusing coil and said side of said tracking coil are disposed between said facing surface of said yoke and said magnetic pole of said magnet.