Compensation of reticle flatness on focus deviation in...

Photocopying – Projection printing and copying cameras – Focus or magnification control

Reexamination Certificate

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C355S077000

Reexamination Certificate

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07924405

ABSTRACT:
A method for lithography patterning includes providing a mask for photolithography patterning; measuring a mask flatness of the mask; calculating focal deviation of imaging the mask to a substrate in a lithography apparatus; adjusting the lithography apparatus to have a compensated focal plane of the mask based on the focal deviation; and exposing the semiconductor substrate utilizing the mask and the lithography apparatus with adjusted focal plane.

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