Patent ID: 7141450

Claim:
A method for aligning two chips to form a micro-electromechanical systems (MEMS) flip-chip comprising the step of: forming at least one fiducial mark in a first chip that is one of the set consisting of transparent and translucent to a wavelength of light shorter than infrared light, said first fiducial mark not being at the edge of said first chip; forming at least one fiducial mark in a second chip, said at least one fiducial mark in said second chip not being at the edge of said second chip and being one of the set consisting of transparent and translucent to said wavelength of light; and precisely aligning said at least one fiducial mark in said first chip with said at least one fiducial mark in said second chip using a video camera that sees light of said wavelength that has passed through said at least one fiducial mark in said first chip and said at least one fiducial mark in said second chip so as to precisely align said first and second chips to a precision of one micron or less when forming said MEMS flip-chip.