| 摘要 |
PURPOSE:To make a hole in the work perpendicularly to the surface thereof with high accuracy, by bringing plate-like objects into tight contact with one or both sides irradiated with a laser beam and rear side of the work. CONSTITUTION:Backing plates 11, 12 are brought into tight contact with the side to be irradiated with a laser beam or rear side or both sides of the work 10 by using a fixing jig 13, etc. A light condenser 8 is adjusted to focus the converged laser beam on the inside of the plate 11. When the laser beam is irradiated to the plate 11, a hole of a tapered opening shape is first opened in the plate 11 then a fine hole is penetrated through the work 10, whereafter the penetration of the hole is stopped in the mid-way of the plate 12. When the plates 11, 12 are removed after the working, there are no burrs in the work 10, and the fine hole having a small difference in diameter between the inlet and outlet is allowed to remain. |
