Patent ID: 11955363
Assignee: ROCKLEY PHOTONICS LIMITED
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 16:
17. A fixture for holding a wafer, the fixture comprising:
a plate for supporting a central region of the wafer, the central region including 80% of an area of the wafer; and
a frame for supporting:
an edge of the wafer, and
an edge of the plate,

the frame having:
a first vacuum passage, for pulling the wafer against an upper surface of the frame, and
a second vacuum passage, for pulling the plate against the frame,

wherein the frame has a recess defined at least in part by a bottom shelf and by a sidewall, the sidewall being connected between the bottom shelf and the upper surface of the frame, and
wherein the fixture further comprises a third vacuum passage that is connected to a hole in the sidewall.