| 摘要 |
PROBLEM TO BE SOLVED: To provide a tape-wound core with low iron loss and low exciting power, which is preferably used for a transformer core and the like.SOLUTION: A tape-wound core includes a soft magnetic alloy thin band 1 manufactured by rapid solidification and recessions 2 formed by irradiating the soft magnetic alloy thin band 1 with a laser beam. In the longitudinal direction of the soft magnetic alloy thin band 1, columns of recessions 2 in the width direction are arranged in substantially prescribed intervals D. Doughnut-shaped protrusions are formed around the respective recessions, where each of the doughnut-shaped protrusions has smooth surface with substantially no scattering of molten alloy produced by the irradiation with the laser beam and has a height tof 2.0 μm or less. In addition, a ratio t/T, which is a ratio of a depth tof the recession to a thickness T of the thin band, lies within a range of 0.025 to 0.18. Further, the thin band is wound with a surface on which the recessions are formed facing the outside. |
