Patent ID: 11934109
Assignee: ZHONGKE JINGYUAN ELECTRON LIMITED, BEIJING (CN)
Field: Optics (Instruments)
Classification: CPC G  H | IPC G  H

Claim 2:
3. The overlay alignment mark according to claim 2, wherein the upper-layer pattern of the wafer comprises a plurality of through-holes arranged in an array, and the two pairs of hollowed features comprise: a first pair of through-holes arranged in one of both a row direction and a column direction of the array, and a second pair of through-holes arranged in the other of both the row direction and the column direction of the array, in the plurality of through-holes; and
wherein respective two opposite side edges of the strip-shaped sections of the pair of solid features extending in one of the row direction and the column direction are at least partially exposed from a respective pair of the first pair of through-holes and the second pair of through-holes.