Laser processing apparatus, irradiated facet specifying method, and laser beam applying method

Abstract

A laser processing apparatus includes a laser oscillator for emitting a laser beam, a polygon mirror having a plurality of reflective facets and rotatable for scanning the laser beam, a beam condenser for focusing the laser beam scanned by the polygon mirror, a detectable mark rotatable together with the polygon mirror, and a sensor for detecting the detectable mark, the sensor being not rotatable together with the polygon mirror. An irradiated facet that is irradiated with the laser beam is specified among the reflective facets on the basis of the detection of the detectable mark by the sensor.

Dependencies are inferred from the claim text.