| 摘要 |
<p>The apparatus has a magnetic head with a magnet coil and voltage source, and a switch (8) between the coil and the source. Another switch (16) maintains a current flow direction via the coil. A current measuring device (14) determines current intensity in the coil. The switch (8) is switched on and off cyclically such that the intensity does not exceed or undershoot a level required for writing a magnetic layer.</p> |
