公开(公告)号：EP4001230A1

公开(公告)日：2022-05-25

申请号：EP20841249.4

申请日：2020-02-19

申请人： Nitto Denko Corporation

发明人： KANNO, Toshihiro ,  SHINOZAKI, Takahiro ,  NAKAI, Kota ,  MATSUO, Naoyuki

IPC分类号： C03B33/033 ,  C03B33/07 ,  C03B33/09 ,  B28D5/00 ,  B23K26/364 ,  G02B5/30 ,  G02F1/1335

摘要： To provide a method that is capable of dividing a composite material in which a brittle material layer and a resin layer are laminated, without generating a crack in an end face of the brittle material layer.
This invention is a method for dividing a composite material 10 in which a brittle material layer 1 and a resin layer 2 are laminated, including: a resin removing step of irradiating the resin layer with a laser beam L1 oscillated from a CO 2 laser source 20 along scheduled dividing lines DL of the composite material to form a processing groove 25 along the scheduled dividing lines; and after the resin removing step, a brittle material removing step of irradiating the brittle material layer with a laser beam L2 oscillated from an ultrashort pulsed laser source 30 along the scheduled dividing lines to form a processing mark 11 along the scheduled dividing lines. In the resin removing step, in a region IS where the scheduled dividing lines intersect, the laser beam oscillated from the CO 2 laser source is not irradiated multiple times, or an irradiation amount of the laser beam is decreased relative to an irradiation amount in a region other than a region where the scheduled dividing lines intersect.