| 摘要 |
PURPOSE:To enable the marking by the letter of a different combination by selecting the mask hole of the peripheral edge part of a discoid mask closest to a laser light source and arranging in order the mask hole of the other discoid mask inside the transmission window adjacent the mask hole thereof. CONSTITUTION:The 1st mark hole 14 of the mask plate 13a closest to a laser light is located at the left end part of the inside of the marking area 20 by a laser light. The 2nd mark hole 14 of the mark plate 13b of the next step is then located at the left end part located inside the transmission window 18 of the right-hand neighbor of the mark hole 14 of this mask plate 13a. The mark hole 14 corresponding to the next step mask plate 13 is arranged in order at the left end part inside the transmission window 18 of the right-hand neighbor of the mark hole 14 located similarly thereafter. The laser light is projected inside the marking area 20 and the laser light passing through the mark hole 14 is reduced by a reduction lens, projected on the surface of a marking body and the marking is performed. |
