Patent ID: 11938562
Assignee: YANGTZE MEMORY TECHNOLOGIES CO., LTD.
Field: Machine tools (Mechanical engineering)
Classification: CPC B  H | IPC B

Claim 4:
5. The method of claim 4, wherein moving the laser beam in the bonded structure according to the scan pattern to form the series of ablation structures in the bonded structure comprises:
converging, at a first horizontal location, the laser beam respectively on the first focal plane and on the second focal plane, to form the first ablation spot in the first wafer at the first cutting level and the second ablation spot in the second wafer at the second cutting level, the first and the second ablation spots being aligned vertically; and
converging, at a second horizontal location, the laser beam respectively on the first focal plane and on the second focal plane, to form another first ablation spot in the first wafer at the first cutting level and another second ablation spot in the second wafer at the second cutting level, the first and the other first ablation spots being aligned horizontally, the second and the other second ablation spots being aligned horizontally, and the other first and the other second ablation spots being aligned vertically.