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    • 93. 发明授权
    • Lithographic apparatus and device manufacturing method involving a level sensor having a detection grating including three or more segments
    • 涉及具有包括三个或更多个段的检测光栅的液位传感器的平版印刷设备和设备制造方法
    • US08351024B2
    • 2013-01-08
    • US12722924
    • 2010-03-12
    • Arie Jeffrey Den Boef
    • Arie Jeffrey Den Boef
    • G03B27/58
    • G01B11/0608G03F9/7034
    • A level sensor configured to determine a height level of a substrate is disclosed. The level sensor includes a projection unit to project a measurement beam having a substantially periodic radiation intensity on the substrate; a detection unit to receive the measurement beam after reflection on the substrate, the detection unit having a detection grating arranged to receive the reflected measurement beam, the detection grating comprising at least one array of three or more segments together having a length substantially equal to a length of a period of the measurement beam projected on the detection grating, and configured to split the reflected measurement beam in three or more reflected measurement beam parts, and three or more detectors each arranged to receive one of the three or more measurement beam parts; and a processing unit to calculate a height level on the basis of the measurement beam parts.
    • 公开了一种配置成确定基板的高度水平的液位传感器。 液位传感器包括:投影单元,用于将具有基本上周期性辐射强度的测量光束投射到基板上; 检测单元,用于在所述基板上反射之后接收所述测量光束,所述检测单元具有布置成接收所述反射的测量光束的检测光栅,所述检测光栅包括三个或更多个段的至少一个阵列,所述三个或更多个段的长度基本上等于 投影在检测光栅上的测量光束的周期的长度,并且被配置为将反射的测量光束分成三个或更多个反射的测量光束部分,以及三个或更多个检测器,每个检测器被布置成接收三个或更多个测量光束部分中的一个; 以及处理单元,其基于测量光束部分来计算高度水平。