Patent ID: 11958129
Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Field: Optics (Instruments)
Classification: CPC B  G | IPC B  G

Claim 6:
7. A method of operating a laser processing device, the method comprising:
condensing, by a condensing lens of the laser processing device, laser light supplied from a light source onto a surface of a structure to irradiate the surface of the structure, wherein the laser processing device comprises a varifocal lens disposed on an optical path of the condensing lens;
measure the laser light at a position between the condensing lens and the structure;
measure, by the laser processing device, a condensation position where the laser light is condensed by the condensing lens based on the laser light measured at the position between the condensing lens and the structure; and
controlling, by the laser processing device, a focal position of the varifocal lens such that a difference between the condensation position and a prescribed condensation position falls within a first preset acceptable range.