Patent ID: 8933374
Filing Date: 2015-01-13
Classification: B23K,G02B

Abstract:
1. A pulse laser machining apparatus comprising: a reference clock oscillating circuit for generating a clock signal; a laser oscillator for emitting a pulse laser beam in synchronization with the clock signal; a laser beam scanner for scanning the pulse laser beam in synchronization with the clock signal only in a one-dimensional direction, the laser beam scanner including a rotary encoder and a laser beam scanner control unit, the rotary encoder transmitting a scan angle detected signal to the laser beam scanner control unit, the laser beam scanner control unit configured to output a scan angle signal based on the scan angle detected signal; a stage capable of holding an object to be machined thereon and moving in a direction perpendicular to the one-dimensional direction, the stage configured to be in a stationary state while the laser beam scanner scans the pulse laser beam; a pulse picker provided in an optical path between the laser oscillator and the laser beam scanner to pass/cutoff the pulse laser beam in synchronization with the clock signal; a pulse picker control unit for controlling the pulse picker on the basis of the number of light pulses of the pulse laser beam; a machining control unit configured to determine a timing of movement of the stage based on the scan angle signal, the machining control unit directing start of a movement of the stage when receiving the scan angle signal indicating an end of a scan of the pulse laser beam by the laser beam scanner; and a correction mechanism for correcting a machining origin point position for each scan on the basis of the scan angle detected signal, wherein the correction mechanism controls pass/cutoff of the pulse laser beam in the pulse picker on the basis of the scan angle detected signal.