Patent ID: 11961649
Assignee: SEIKO EPSON CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  B  Y | IPC B  H

Claim 6:
7. A method for manufacturing an amorphous metal ribbon, comprising:
preparing a material ribbon having a main surface made of an amorphous metal; and
applying laser processing to the main surface of the material ribbon to obtain an amorphous metal ribbon having a plurality of laser irradiation mark rows each including a plurality of laser irradiation marks arranged in a row,
wherein when a distance between the laser irradiation mark rows that are adjacent to each other is set as d1, a distance between the laser irradiation marks in the laser irradiation mark row is set as d2, a diameter of the laser irradiation mark is set as d3, and a number density D of the laser irradiation marks is set as (1/d1)×(1/d2), the number density D of the laser irradiation marks is 0.05 pieces/mm2 or more and 0.50 pieces/mm2 or less,
when an area occupancy rate A of the laser irradiation marks is set as D×(d3/2)2×π×100, the area occupancy rate A of the laser irradiation marks is 0.0035% or more and 0.040% or less, and
the diameter d3 of the laser irradiation mark is 0.010 mm or more and 0.030 mm or less.