Abstract: A stator core (11) is mounted to a stationary member (22) and electric wiring on the stator side is carried out, to thereby assemble a first sub-module (20), and a rotor core (12) is mounted to a rotary member (21) and electric wiring on the rotor side is carried out, to thereby assemble a second sub-module (30). Thereafter, the first and second sub-modules are assembled together, with the stator core and the rotor core opposed to each other, whereby a separable transformer is assembled. A guide member (27), having first and second reference faces defining reference positions in diametrical and axial directions of the rotation shaft (21), respectively, is provided in the rotation shaft (21) rotatably supported by the stationary member and mounted with the rotor core. Mounting positions of the cores are determined with use of the guide member, thereby precisely setting a center position between the cores and a gap length g.

Abstract: A rotary magnetic head unit has a non-contact type transmission device capable of reliably performing non-contact transmission both in signal and power supply systems and designed so as to be smaller in size. The non-contact type transmission device is formed of a rotating member and a fixed member each having a power supply wiring section for transmitting a power supply, a signal wiring section for transmitting a signal, and a crosstalk prevention section positioned between the power supply wiring section and the signal wiring section to prevent crosstalk between these sections. If a reproducing head formed of a magnetoresistive element is used by being supplied with a bias current from the power supply transmitted by the power supply wiring sections of the rotary and fixed members, the rotary magnetic head unit uses bias current control means to change the bias current supplied to the reproducing head according to the amount of wear of the recording head during reproduction from signals from magnetic tapes.

Abstract: A magnetic recording/reproducing apparatus, comprising a video circuit including a cylinder with a magnetic head and a power circuit provided with a transformer having a core with a gap formed in it. The transformer is positioned so that a direction for connecting a S pole with a N pole created by a leakage magnetic flux from the gap of the core and a direction for connecting a central portion of the cylinder, where the magnetic head is provided, with the central portion of the gap of the transformer together defining a substantially horizontal plane, and the cylinder and the transformer are positioned at a distance so that a reading signal read by the magnetic head is hardly influenced by the leakage magnetic flux.