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    • 4. 发明授权
    • Lithographic device and method for wafer alignment with reduced tilt sensitivity
    • 用于晶片对准的平版印刷设备和方法,具有降低的倾斜灵敏度
    • US06891598B2
    • 2005-05-10
    • US10776640
    • 2004-02-12
    • Gerbrand Van Der Zouw
    • Gerbrand Van Der Zouw
    • G03F9/00H01L21/027G03B27/54G03B27/42
    • G03F9/7088G03F9/7034G03F9/7046G03F9/7049
    • A wafer or substrate alignment system for a lithographic apparatus, capable of exhibiting reduced tilt sensitivity, is presented herein. In particular, the substrate alignment system detects a position of a substrate relative to a position of a patterning device and includes a source configured to generate an incoming optical beam, at least one grating, provided on the substrate, having a diffracting length, in which the at least one grating is configured to generate at least one diffraction order of constituent diffracted beams based on an interaction with the incoming optical beam over the diffracting length. The system further includes an optical device, configured to image the at least one diffracted order on a sensor device, and includes aperture at a predetermined location to allow the constituent diffracted beams to pass through. The optical device is arranged to broaden the constituent diffracted beams such that a beam diameter of the constituent diffracted beams is larger than a diameter of the aperture, in order to reduce the sensitivity to tilt.
    • 本文给出了能够显示降低的倾斜灵敏度的用于光刻设备的晶片或衬底对准系统。 特别地,衬底对准系统相对于图案形成装置的位置检测衬底的位置,并且包括被配置为产生入射光束的源,设置在衬底上的具有衍射长度的至少一个栅格,其中, 所述至少一个光栅被配置为基于与衍射长度上的入射光束的相互作用来产生构成衍射光束的至少一个衍射级。 该系统还包括光学装置,其配置成对传感器装置上的至少一个衍射级进行成像,并且在预定位置包括允许构成衍射光束通过的孔。 光学装置被布置成使构成的衍射光束变宽,使得构成衍射光束的光束直径大于光圈的直径,以便降低对倾斜的灵敏度。