Abstract: A magnetic signal reproducing apparatus which can lessen fluctuation of reproduced outputs in reproducing magnetic signals recorded in a magnetic tape by a magneto-resistance effect type magnetic head even if a magnetic tape sliding face of the magneto-resistance effect type magnetic head is abraded. A current value of a sense current when a voltage fluctuation level of the sense current caused when a magnetic field in the normal direction is applied to a magneto-resistance effect element of the magneto-resistance effect type magnetic head is equal with a voltage fluctuation level of the sense current caused when a magnetic field in the opposite direction is applied thereto is set to a predetermined value I0. Then, the current value of the sense current supplied to the magneto-resistance effect element of the magneto-resistance effect type magnetic head is set to be greater than I0 in reproducing the magnetic signals recorded in the magnetic tape.

Abstract: A rotary magnetic head apparatus which can be formed into a smaller size is provided in a case in which signals of a plurality of recording tracks which are recorded on a tape-like information recording medium are reproduced by using a plurality of reproduction heads without depending on the arrangement of the recording tracks in the information recording medium.

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 of the helical scan system employing a MR head as a reproducing magnetic head. The magnetic recording/reproducing apparatus includes a MR head 6 and a rotary drum carrying the MR head 6. In reproducing signals from the magnetic tape 7 in accordance with the helical scan system, a magnetic tape 7, having a large number of projections 7c on the tape surface and containing an electrically conductive material in its magnetic layer, is used as a recording medium.