Patent ID: 8278594
Filing Date: 2012-10-02
Classification: B23K,C23F,H01L,H05K,Y02B

Abstract:
1. A laser processing apparatus for irradiating a work with a laser beam so as to process the work with the laser beam, comprising: a laser oscillator for oscillating a laser beam; a polarizing beam splitter disposed downstream of the laser oscillator; a beam scan optical system disposed downstream of the polarizing beam splitter, wherein the beam scan optical system includes a scanner and a processing lens for positioning the laser beam emitted from the laser oscillator onto the work; a quarter wave plate disposed between the processing lens and the work and for polarizing light reflected by the work; and an optical sensor disposed downstream of the polarizing beam splitter when viewed from the work, wherein: the beam scan optical system is disposed between the polarizing beam splitter and the quarter wave plate, such that light emitted from the laser oscillator and reflected by the beam scan optical system toward the polarizing beam splitter without reaching the work is prevented from reaching the optical sensor.