| 摘要 |
PURPOSE:To remove the defective control of gap depth at the spherical working of the sliding surface of a recording medium and to improve the yield by arranging a gap depth monitor between head tracks. CONSTITUTION:The gap depth monitor 9 having about 3-10mum width and consisting of Fe-Ni alloy, Fe-Al-Si alloy, etc. is formed between the head tracks 8. The monitor 9 is formed like a triangle or sector obtained by extending lines expanded from the intersecting point E of the center line between the head tracks and a line setting up the gap depth values G, D to zero in the gap depth G, D direction so that angles theta, theta' become equal up to the inside lines of respective head tracks and connecting the intersecting points F, G of said extended line and the inside lines of respective head tracks by straight lines or curved lines. An approximately rectangular recording medium sliding surface 14 is formed on the opposite surfaces of a pair of a lower magnetic thin film 2 and an upper magnetic thin film 6 by machine working such as lapping, the change of the width of the monitor 9 is read out by a microscope or the like and the gap depth values G, D are calculated to finish the recording medium sliding surface like a spherical surface. |
