Patent ID: 11965731
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 0:
1. A measurement method, comprising:
providing a base, a device disposed on the base, and a lid disposed over the base and the device, wherein the lid includes an opening disposed above and tapered toward the device, and the opening includes a lower end proximal to the device;
irradiating a top surface of the device through the opening to obtain a first focal plane associated with the top surface of the device;
irradiating the lid at the lower end of the opening to obtain a second focal plane associated with the lid at the lower end of the opening; and
deriving a distance between the top surface of the device and an interior surface of the lid facing the top surface of the device based on a difference between a level of the first focal plane and a level of the second focal plane.