LASER BEAM MACHINE AND DAM BAR WORKING METHOD

摘要

PROBLEM TO BE SOLVED: To change the relative position of a detecting position to a working position, to prevent a detecting light from the loss of a reflecting light quantity to execute a high precision of detection and to work at a high speed with a high precision of positioning. SOLUTION: A detecting laser beam 228 is made to pass through a wedge substrate 225 to tilt the optical path, further transfered in parallel by a parallel flat plate glass 227, made to pass through the front side focusing position P of a condensing lens 221, and irradiates the work 1 via the condensing lens. Since a reflecting light reflected with the work 1 returns through the same optical path as at the time of incidence and makes incident to a photodetector 226, the reflecting light quantity is not reduced. And the oscillation of the machining laser beam is controlled based on the detecting signal from the photodetector 226.