Abstract: A multiphase transformer is provided for converting an input signal having N phases into an output signal having M phases. The transformer includes a plurality of first windings connected together to provide a load for an N phase signal, with each of the first windings having a plurality of take-off points, including tap-off points interior to the ends of the first windings. A mechanism is provided for coupling the input signal to the first windings. A plurality of M output terminals is further provided as is a mechanism for coupling the M output terminals to at least some of the take-off points of the first windings. This mechanism includes a plurality of second windings, with the second windings each electrically coupled between one of the output terminals and one of the tap-off points of the first windings and with each of the second windings magnetically coupled to another of the first windings.

Abstract: A positioning device for optical disk storage having a laser light source for creating a light beam, a scanning arrangement including an arrangement to focus the light beam onto a selected information track of the optical storage, a control unit, an arrangement for coarse positioning of the beam and an arrangement for fine positioning of the beam, which include a regulating loop in cooperation with a detector arrangement to produce track error signals and focus error signals characterized by the storage disk being divided into a plurality of concentric track zones with each zone comprising an plurality of information tracks, the scanning arrangement being sub-divided into a plurality of scanning units with one scanning unit for each of the concentric track zones and the units being arranged next to each other on a line which is preferably a segment of an arc, an arrangement for displacing each of the units relative to the line with the coarse positioning arrangement comprising a rotatable reflector mounted in