Patent ID: 8448471

Claim:
A processing device configured to irradiate a laser beam onto a glass substrate for processing the glass substrate, comprising: a work table disposing a glass substrate as a processing target thereon; a laser beam output section configured to output a laser beam; a multi-spot focus section configured to receive the laser beam, the multi-spot focus section configured to split and to focus the laser beam inputted therein into a plurality of beam focus spots; a rotation drive mechanism configured to rotate the plurality of beam focus spots about a single center axis arranged in a center of the plurality of beam focus spots; an optical system configured to guide the laser beam outputted from the laser beam output section to the multi-spot focus section; a laser beam scan section configured to move all the plurality of beam focus spots rotating about the single center axis in a desired direction within a predetermined range of a plane arranged along a surface of the glass substrate; a diffractive optical element configured to split the laser beam inputted therein through the optical system into a plurality of laser beam fluxes; and a collective lens configured to concentrate the plurality of laser beam fluxes split by the diffractive optical element, the rotation drive mechanism configured to rotate the diffractive optical element.