Patent ID: 9346123
Filing Date: 2016-05-24
CPC Classification: B23K,C21D,C22C

Claim Text:
1. A device that improves iron loss properties of a grain oriented electrical steel sheet having been subjected to finish annealing by irradiating a surface of the grain oriented electrical steel sheet with a laser to reduce iron loss of the electrical steel sheet, comprising a laser irradiator having a laser beam emission port wherein, a distance between the laser beam emission port of the laser beam irradiator emitting laser and a laser beam irradiation point on the electrical steel sheet is L (mm); a laser beam irradiation angle formed by a line linking the laser beam emission port and the laser beam irradiation point with respect to a direction vertical to the electrical steel sheet is θ (°); and L≦50, the laser beam emission port is positioned such that L and θ satisfy: