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US08638438B2 Self-calibrated alignment and overlay target and measurement 失效
自校准对准和覆盖目标和测量

Self-calibrated alignment and overlay target and measurement
Abstract:
An alignment feature disposed on a substrate, the alignment feature including a first lithographic pattern having a first aggregate geometric center point defined by a first sub-pattern comprising alignment marks having a first sub-pattern geometric center point arranged a distance (d0) in a first direction from the first aggregate geometric center point, and a second sub-pattern comprising alignment marks having a second sub-pattern geometric center point arranged the distance d0 in a reciprocal direction of the first direction from the first aggregate geometric center point.
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