Abstract: A carriage assembly for a disc operating apparatus comprising a frame, a carriage movably supported in the frame relative to the disc, an optical lens or magnetic head mounted on the carriage for recording and reproducing information on the disc, and a radial guide arrangement permitting movement of the carriage in a radial direction relative to the disc. The assembly also comprises a radial drive arrangement including an electromagnetic coil mounted to the carriage and a permanent magnet mounted to the frame. The permanent magnet is electromagnetically coupled with the electromagnetic coil for driving the carriage in the radial direction of the disc. The electromagnetic coil includes two sections which sandwich the carriage and are shaped to come into contact with each other at both sides thereof, whereby the cross section of the electromagnetic coil is hexagonal in a plane parallel to a surface of the disc. As a result, the dimensions in the radial direction of the carriage assembly are decreased.

Abstract: A carriage of a head positioning assembly is disposed along an edge of a magnetic disc so as not to come in contact with the magnetic disc, whereby the length of the winding bobbin of the voice coil can be elongated, so that a driving force generated in the elongated winding bobbin causes a magnetic read and write head to rapidly move to a position over an objective track on the magnetic disc.

Abstract: An improved carriage assembly for linearly reciprocating a data converter pickup or the like. Magnetic circuits are provided on each side of a carriage, and a driving coil wound on a transversely solid type coil bobbin which surrounds the carriage, is magnetically linked with the two magnetic circuits. Guide rails are provided between the carriage and the two magnetic circuits. The moving elements including the carriage, the driving coil, and the bobbin are supported on the guide rails for linear movement therealong by rollers.