Patent ID: 6168678
Filing Date: 2001-01-02
Classification: B32B,H01L,Y10T

Abstract:
A method of stacking a plurality of structured substrates to be aligned with one another corresponding to structuring thereof and connected undetachably to one another by bonding, with the substrates having approximately same surface area and with at least one substrate being non-transparent, said method comprising the steps of: providing a substrate handling device having spaced first and second working areas and substrate receiving means provided at each of the first and second working areas; aligning the substrates in the first working area of the handling device, said aligning step including directing a microscope upon substrates, arranged on the receiving means of the first working area, for generating two spatially separated alignment marks of a substrate on an image carrier, with the alignment marks being formed by one of active structures of the substrate itself and by independent markings, and changing an actual position of the substrate by rotating and displacing the receiving means until an image of the alignment marks coincides with a nominal position present upon the image carrier; thereafter, transporting the substrates to the second working area of the handling device and depositing the substrates one upon another in accordance with alignment thereof to form a substrate package; and transporting the substrate package to a heating device for uniform heating of all sides of the package to effect simultaneous bonding of the substrates in a single work step.