LASER MARKING METHOD AND ITS DEVICE

PROBLEM TO BE SOLVED: To provide a laser marking method and its device free of lowering in the manufacturing efficiency and capable of realizing beautiful and highly accurate marking. SOLUTION: In a laser marking method in which a split pattern comparable to one scanning line by a first deflecting system 4 is successively continuously indicated on a mask capable of indicating a marking pattern, in which a laser beam from a laser generator 1 is scanned across the split pattern through the first deflecting system 4, and in which each split pattern is synthetically marked by moving the marking position on a work 10 surface with a second deflecting system by the one scanning transmitted light of each split pattern in the direction orthogonally crossing the scanning direction; the laser beam from the laser generator 1 is passed through a prism 5 and the like, and thereby split into two or more in the direction crossing the optical axis of the laser beam, with a part of such split laser beam superimposed and transmitted in the direction crossing at least the scanning direction of the laser beam in the opening of a liquid crystal mask 3, thereby uniformizing the energy distribution of the laser beam transmitting the opening, and eliminating striped shade in the splitting direction of the marking pattern, so that a beautiful pattern is obtained.