Patent ID: 8368874
Filing Date: 2013-02-05
Classification: G01J,G01S

Abstract:
1. A beam irradiation device comprising: a laser light source for emitting laser light; an actuator for scanning a targeted area with the laser light; a servo optical system which emits servo light, and changing a propagating direction of the servo light in response to driving of the actuator; a photodetector for receiving the servo light to output a signal depending on a light receiving position of the servo light; an actuator controlling section for controlling the actuator based on the signal to be outputted from the photodetector; and a laser controlling section for controlling the laser light source based on the signal to be outputted from the photodetector, wherein the laser controlling section controls the laser light source to emit the laser light in a pulse manner at a timing when the light receiving position of the servo light coincides with a predetermined targeted position.