Lightguide device and laser processing device

A light guide device, comprising:

• a first light guide part reflecting and guiding light emitted from a light source;
• a polygon mirror configured to be rotatable and including a plurality of reflective parts, the reflective parts being arranged to form a regular polygonal reflective surface when viewed in a rotation axis direction, the polygon minor reflecting the light guided by the first light guide part by the regular part while rotating;
• and
• a second light guide part reflecting the light reflected by the reflective part of the polygon mirror and guiding the light so that the light is irradiated to an irradiation target at each of the reflective parts,
• wherein the reflective part of the polygon mirror is configured to reflect the incident light so that the optical axis of the incident light offsets in the rotation axis direction and wherein at least two reflective parts differ from each other in position in the rotation axis direction.

A laser processing device, comprising:

• a light source generating a laser light;
• and
• a light guide device of includes:
• a first light guide part reflecting and guiding the light emitted from the light source;
• a polygon mirror configured to be rotatable and including a plurality of reflective parts, the reflective parts being arranged to form a regular polygonal reflective surface when viewed in a rotation axis direction, the polygon mirror reflecting the light guided by the first light guide part by the regular part while rotating;
• and
• a second light guide part reflecting the light reflected by the reflective part of the polygon mirror and guiding the light so that the light is irradiated to an irradiation target at each of the reflective parts,
• wherein the reflective part of the polygon mirror is configured to reflect the incident light so that the optical axis of the incident light offsets in the rotation axis direction and wherein at least two reflective parts differ from each other in position in the rotation axis direction.