| 摘要 |
PURPOSE:To prevent crosstalk by grinding and machining a shoulder part facing each core chip and its ranging inner surface by an abrasive grain coarser than a tape grinding abrasive grain after each core chip is formed. CONSTITUTION:The shoulder part 22 on the top end surface 5 of the core chip 21 and its ranging inner surface 23 are ground and machined by the abrasive grain coarser than a grinding tape. Thus the shoulder part 22 is chamfered, and simultaneously the inner surface 23 is formed in coarseness. Like the core chip 22, a shoulder part 22' and an inner surface 23' are ground and machined, and they are arranged in parallel on a head base 17 with the core chip 21 and a core chip 21' having a magnetic gap g' at the inverse azimuth angle of the magnetic gap (g) of the core chip 21 as one set. Wires 18 and 18' are wound on both cores 21 and 21' by the prescribed number of turns, and their both end parts are connected to a printed circuit board on the head base 17 to load on the rotating drum of a VTR device. Since both inner surfaces 23 and 23' are set in a nonparallel state, crosstalk at the time of recording and reproducing can be suppressed. |
