Patent ID: 7719778

Claim:
An optical axis tilting device of a laser optical system, comprising: a lens barrel in which a laser optical system is disposed; a tilt frame which is tiltably supported on the lens barrel in at least one of an XZ plane which contains an X-axis and a Z-axis and a YZ plane which contains a Y-axis and the Z-axis, an optical axis of the laser optical system being the Z-axis, one of axes perpendicular to each other in a plane which is perpendicular to the Z-axis being the X-axis and an other being the Y-axis; a tilt sensor which is provided at the tilt frame and is configured to detect a preset reference position of the tilt frame; a fixed frame fixed to the lens barrel and provided with a tilting mechanism which tilts the tilt frame relative to a horizontal plane; a leveling mechanism which supports the lens barrel tiltably, and tilts the lens barrel so as to detect the reference position by the tilt sensor and then levels the tilt frame; a feed screw included in the tilting mechanism which is rotatably driven by a driving motor; a feed piece included in the tilting mechanism, which is reciprocated by the feed screw and engages with the tilt frame and tilts the tilt frame relative to the reference position; a piece position detection device included in the tilting mechanism which is configured to detect a position of the feed piece; and a computing device which is configured to calculate a tilting angle based on the position of the feed piece detected by the piece position detection device.