Patent ID: 8407730

Claim:
An objective lens actuator, for driving an objective lens for focusing lights upon a recoding surface of an optical disc, comprising: a moving part, which comprises said objective lens and a coil; a magnet, which is fixed on a yoke and drives said moving part; a plural number of tilt wires, being extendable in axial directions thereof, each of which supports said moving part at an end thereof; an upper section for fixing an end of one of said plural number of tilt wires close to said objective lens in a focusing direction; a lower section for fixing the other end of said one of said plural number of tilt wire far from said objective lens in the focusing direction, and being disposed opposing to said upper section in the focusing direction; support wires for supporting said moving part from a side opposite to said one of the plural number of tilt wires; said upper section and said lower section, which fix other ends of said plural number of tilt wires being extendable in axial directions thereof, and are disposed opposite to each other in a focus direction; and a moving mechanism, which connects said upper section and said lower section and is provided on said upper and lower sections, so that said upper and lower sections can move in the focus direction, relatively, wherein said moving mechanism further comprising screws that connect said upper and lower sections and coil springs that are inserted into a gap between said upper and lower sections, with each spring having a spring constant in the focus direction.