Actuator for optical equipment capable of reducing the number of coils to necessary to move an objective lens in a tracking direction and a focusing direction

摘要

An actuator for an optical unit moves an objective lens in a tracking direction and/or in a focusing direction of a storage medium, such as a disk. A lens holder has recesses in two surfaces opposing each other and being parallel to a photo axis of the objective lens. Elastic rods are supported by a fixed support member and couple the lens holder to the support member. A plurality of fixed coils are fixedly wound about the surfaces of the lens holder parallel or substantially parallel to the photo axis of the objective lens, in such a manner that individual axes of the wound coils forms two acute angles with respect to the photo axis of the objective lens. A magnetic field generation member generates a magnetic field influencing a portion of the plurality of the fixed coils spaced from the lens holder by the recesses. The objective lens moves in a direction designated by the current or currents flowing through the plurality of fixed coils. Thus, the winding structures of the coils for tracking and focusing the objective lens or the optical pickup are improved.