| 摘要 |
PURPOSE:To eliminate dummy gaps to improve the efficiency by stepping the apex part of the magnetic film part of a C type core, which should be provided with a winding, in parallel with a gap part and eliminating the curvature part of the apex part. CONSTITUTION:Metallic magnetic films 2 and 2' and an insulating layer 7 are laminated on an Mn-Zn ferrite 1 alternately. A nonmagnetic insulating material like Ti, an Al2O3, or an SiO2 is sputtered to form the insulating layer. The magnetic film 2 is stepped in parallel with the gap, and the curvature part of the apex part is sufficiently eliminated up to such area that the apex of a substrate is not parallel with the gap in the gap depth setting work. By eliminating the magnetic film part, the gap part, the substrate, and magnetic films cross obliquely practically even after the gap depth setting work. Since the magnetic flux leaked from the apex part for recording is reduced and a sharp magnetic field is easily generated in the head front end part by the stepping effect, dummy gaps disappear in the head. |
