Miniature head disc drive system voice coil with single coil and dual stationary magnets

摘要

A disc drive system having at least one hard disc having concentric tracks is supported by a hub positioned in a centrally located aperture. The disc is rotated at a constant speed by a DC motor attached to the hub. A transducer head for communicating information with the hard disc is moved relative to the disc surface by a positioning apparatus. The positioning apparatus includes a voice coil motor for selectably and accurately positioning the transducer head over the tracks on the hard disc. The disc drive system is enclosed in a housing having a base portion and a roof portion. The positioning apparatus includes a shaft about which the transducer head rotates to move the transducer from track to track. In one configuration, permanent magnets are attached to the base and roof, and a moving coil is interposed between them, the housing completing a magnetic circuit in the VCM. In one aspect the disc drive system is designed to be permanently mounted in a portable, lap-top or notebook computer. Alternatively, it is adaptable for insertion and removal from a connector port in the computer.