| 摘要 |
PURPOSE:To provide a pulse transformer which satisfies the height requirement and the requested characteristics and which can be manufactured easily by locating parallelly two pipe-like magnetic cores which are made by winding an Fe-base ultrafine crystalline soft magnetic allay in the specific thickness or below and by applying a bifilar winding which passes through two through holes around the facing side faces of the magnetic cores. CONSTITUTION:Using an Fe-base ultrafine crystalline ribbon (thinner than 15mum), magnetic cores 1 are manufactured. Then, the magnetic cores 1 are heat-treated in a nitrogen atmosphere. Six parallel wires are wound (2) nine turns using a wire rod 3 and a pulse transformer of 18 turns at the primary side and 36 turns at the secondary side is manufactured. Out of the six parallel wires, two wires are connected in series to make an 18-turn winding and four wires are connected in series to make a 36-turn winding. A pulse transformer for ISDN is manufactured by installing the pipe-like magnetic cores 1 in through holes 12 of a case 11. For preliminary preparations, the wire rod 3 which constitutes the primary coil is colored. By this method, a pulse transformer which satisfies the characteristics of a pulse transformer for ISDN and which can be made thin and can be manufactured easily can be provided. |
