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

Claim 16:
17. A measurement method, comprising:
providing a device having a top surface;
forming a first opening and a second opening extending through a lid;
disposing the lid above the device to at least partially expose the top surface of the device through the first opening and the second opening;
irradiating the top surface of the device through the first opening or the second opening to obtain a first focal plane associated with the top surface of the device;
irradiating a first lower end of the first opening proximal to the top surface of the device to obtain a second focal plane associated with the first lower end of the first opening;
irradiating a second lower end of the second opening proximal to the top surface of the device to obtain a third focal plane associated with the second lower end of the second opening; and
deriving a first vertical distance between the first focal plane and the second focal plane, and a second vertical distance between the first focal plane and the third focal plane.