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US06963391B2 Lithographic apparatus and device manufacturing method 有权
平版印刷设备和器件制造方法

Lithographic apparatus and device manufacturing method
摘要:
A reflector alignment system uses an alignment beam propagating through a projection system that includes a mirror group to measure the apparent relative positions of two reference marks fixed to a reference frame on opposite sides of the projection system. Any movement of mirrors in the projection system will be detected as a shift in the apparent position of the reference marks.
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