| 摘要 |
PURPOSE:To obtain a thin film magnetic head which has controlled a gap depth with high accuracy, by providing a polishing depth detecting pattern consisting of a coil layer insulation layer, and having an oblique line part whose shape is not parallel nor vertical to a gap depth zero level line, on a gap forming part of a head. CONSTITUTION:A thin film magnetic head is formed from a lower part core 7, a layer insulation layer 11, a coil 1 for an electromagnetic conversion, and an upper part core 2. The upper part core 2 and the lower part core 7 are connected by a core connecting part 8, and form a magnetic circuit by providing a gap 9. x1 and x2 denote a position of a gap depth '0', and a position of a prescribed gap depth, respectively, and the gap 9 becomes an effective gap for an electromagnetic conversion extending from x2 and x1. A prescribed gap depth can be obtained by observing a through-hole shape of a gap forming part from a tape sliding surface side by a microscope, and executing a polishing work until a position denoted by x2, namely, right and left patterns of the insulation layer 11 become equal. |
