| 摘要 |
Disclosed is a method for printing a mark on an inner peripheral surface of a ring by using a laser marking apparatus. The laser marking apparatus includes a jig for rotatably supporting the ring, a laser oscillator and a galvano scanner, in which the jig is installed below a laser irradiation port provided in the galvano scanner, grips an outer peripheral surface of the ring such that the ring is inclined at an angle of 5 to 20° with respect to a vertical line, and rotates the ring about a center of the ring as driving force is applied thereto from a stepping motor. The jig is driven such that the jig performs one revolution per 10000 steps of the stepping motor. A plurality of sub-marks having a size of 2 mm are formed by dividing the mark to be printed on the inner peripheral surface of the ring in a transverse direction thereof and the sub-marks are sequentially printed on the inner peripheral surface of the ring through laser irradiation. The jig performs the stepping movement corresponding to each sub-mark having the size of 2 mm.
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