| 摘要 |
PURPOSE:To improve remarkably the reproduced output of a head, lap writing characteristic, etc. in a high recording density region by improving the efficiency of the head and adapting the vertical orientation of a medium. CONSTITUTION:The decreased efficiency of the head as a result of a decreased gap is made up by miniaturizing the head to adapt the ratio Br (rt. angle)/ Br (//) between the coercive force Hc and residual magnetic flux of the medium to the head. More specifically, the coercive force Hc is adjusted to 500-1600Oe and Br (rt. angle)/ Br(//) to 0.4-3.0. the device is so constituted that the average magnetic path length/gap length ratio l/gl does not exceed 3X10<4> with respect to the head having the gap length gl in a 0.3-0.6 mum range. The head output, lap writing characteristic, etc. in the high recording density region are thus improved. |
