MAGNETIC RECORDING SYSTEM

摘要

PURPOSE:To eliminate the magnetic interference between an erasion core and a read/write core in a signal recording mode and to decrease the reading errors in a reproducing mode, by applying a magnetic flux having the opposite direction to and the same quantity as the magnetic flux which leaks out to the read/write core from the erasion core. CONSTITUTION:In a signal recording mode a switching transistor 28 is turned on to make an erasion coil 13 conduct. Then an erasing DC magnetic flux is energized to an erasion core 10. At the same time, a read/write coil 11 also conducts by the transistor 28. Then a DC magnetic flux is energized to a read/write core 5. In this case, the magnetic flux energized by the coil 11 makes a round of loop of a read/write L type core 2 read/write gap 1 a read/write I type core 3 a read/write back bar core 4 the core 2. This magnetic flux is set opposite to the direction of the magnetic flux leaked out of the core 10 at the gap 1. Therefore a resistance 32 is controlled to a proper level of resistance. Thus it is possible to eliminate the effect of the magnetic flux leaked out of the core 10 in a recording magnetic field.