Objective lens-driving apparatus

An objective lens driving apparatus comprising:

• an objective lens, having an optical axis and focusing light emitted from a light source on an information recording medium;
• a lens holder, holding said objective lens and having a bearing hole formed therein that extends in a direction substantially parallel to the optical axis;
• a shaft inserted into the bearing hole so that said lens holder is rotatably supported on the shaft;
• a pair of magnets supported on said lens holder, said pair of magnets being positioned in such a way that said shaft is between said pair of magnets;
• a pair of magnetic yokes;
• a base made of a non-magnetic material and holding said pair of magnetic yokes disposed such that each of said pair of magnets exerts an attraction force on a corresponding one of said pair of magnetic yokes to urge said lens holder both in a direction substantially parallel to the optical axis and in a direction substantially perpendicular to the optical axis;
• a first coil set of a first focusing coil and a first tracking coil and a second coil set of a second focusing coil and a second tracking coil, said first coil set and said second coil set being wound around corresponding ones of said pair of magnetic yokes.

An objective lens driving apparatus comprising:

• an objective lens, having an optical axis and focusing light emitted from a light source on an information recording medium;
• a lens holder, holding said objective lens and having a bearing hole that extends in a direction substantially parallel to the optical axis;
• a shaft inserted into the bearing hole so that said lens holder is rotatably supported on the shaft;
• a pair of magnets supported on said lens holder, said pair of magnets being positioned in such a way that said shaft is between said pair of magnets;
• a pair of magnetic yokes;
• a pair of yoke carrying members made of a non-magnetic material, and each of said pair of yoke carrying members holding a corresponding one of said pair of magnetic yokes thereon;
• a base made of a non-magnetic material, holding said shaft and holding said of pair of yoke carrying members disposed such that each of said pair of magnets exerts an attraction force on a corresponding one of said pair of magnetic yokes to urge said lens holder both in a direction of the optical axis and in a direction substantially perpendicular to the optical axis;
• a first coil set of a first focusing coil and a first tracking coil and a second coil set of a second focusing coil and a second tracking coil, said first coil set and second coil set being wound around corresponding ones of said pair of magnetic yokes.