Patent attributes
An objective lens actuator includes an objective-lens-side main magnet and two stationary-holder-side main magnets mounted to a base body. The objective-lens-side main magnet is positioned to face the two stationary-holder-side main magnets across a gap. The magnets form a magnetic circuit producing magnetic flux extending from either the objective-lens-side main magnet or the two stationary-holder-side main magnets to the remaining magnet(s). The objective lens holder includes a focusing coil and a tilting coil. The focusing coil is located so that the objective-lens-side main magnet and the two stationary-holder-side main magnets are present outside and inside a winding of the focusing coil respectively. The tilting coil is located so that: the objective-lens-side main magnet is present outside a winding of the tilting coil; one of the stationary-holder-side main magnets is present inside the winding; and the remaining one of the stationary-holder-side main magnets is present outside the winding. The structure enables tilt correction and restrains undesirable tilting of the objective lens in a focusing action, for example.
