Patent ID: 11862495
Assignee: CHANGXIN MEMORY TECHNOLOGIES, INC.
Field: Semiconductors (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 0:
1. A monitor wafer measuring method, comprising:
fixing a product wafer, the product wafer having alignment marks and product measuring sites corresponding respectively to the alignment marks;
determining the product measuring sites according to the alignment marks;
placing a monitor wafer, a projection of the monitor wafer in a vertical direction being aligned with and coinciding with the product wafer, wherein the monitor wafer has a plurality of measuring sites to be measured thereon, the product measuring sites are in one-to-one correspondence with the plurality of measuring sites to be measured;
selecting a measuring site to be measured as a target measuring site to be measured, and selecting a product measuring site corresponding to the target measuring site to be measured as a target product measuring site, to take an alignment mark corresponding to the target product measuring site as a target alignment mark;
judging, by a first measuring unit, whether the target alignment mark is aligned with a predetermined position, wherein the predetermined position is a detection position of the first measuring unit;
when the target alignment mark is aligned with the predetermined position, measuring the target measuring site to be measured; and
when the target alignment mark is not aligned with the predetermined position, moving the product wafer and the monitor wafer synchronously.