Patent ID: 11931827
Assignee: HAN'S LASER TECHNOLOGY INDUSTRY GROUP CO., LTD.
Field: Machine tools (Mechanical engineering)
Classification: CPC B  G | IPC B  G

Claim 3:
4. The laser cutting device according to claim 2, wherein a side of the beam expanding element close to the spectroscopic element is an image side, a side of the beam expanding element away from the spectroscopic element is an object side, the lens sets closest to the image side is a first lens set and a second lens set in sequence, the first lens set and the second lens set are the movable lens sets, the movable lens sets are capable of moving along the direction of the optical axis of the beam expanding element; the first lens set and the second lens set provide positive refractive power, a focal point on the object side of the first lens set coincides with a converging point of a light beam on the image side of the second lens set; or
the first lens set provides negative refractive power, and the second lens set provides positive refractive power, a virtual focus on the image side of the first lens set coincides with a converging point of a light beam on the image side of the second lens set.