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    • 82. 发明申请
    • Method and apparatus for detecting relative positional deviation between two objects
    • 用于检测两个物体之间的相对位置偏差的方法和装置
    • US20060007440A1
    • 2006-01-12
    • US11166106
    • 2005-06-27
    • Ryo KurodaYasuhisa Inao
    • Ryo KurodaYasuhisa Inao
    • G01B11/00
    • G03F9/7076B82Y10/00B82Y40/00G03F7/0002G03F9/7038G03F9/7042
    • Disclosed is a method and apparatus for detecting a relative positional deviation between first and second objects. In one preferred form of the invention, the detecting method includes the steps of (i) providing the first and second objects with diffraction gratings, respectively, each having a grating pitch larger than a wavelength of a light source used, (ii) placing the first and second objects so that a dielectric material layer having a thickness smaller than the wavelength of the light source used is interposed between the first and second objects, and so that the diffraction gratings of the first and second objects are opposed to each other, (iii) projecting light from the light source onto the diffraction gratings of the first and second objects, and (iv) detecting the relative positional deviation between the first and second objects on the basis of diffraction light projected from the diffraction gratings to a space.
    • 公开了一种用于检测第一和第二物体之间的相对位置偏差的方法和装置。 在本发明的一个优选形式中,检测方法包括以下步骤:(i)分别为第一和第二物体提供衍射光栅,每个衍射光栅具有大于所使用的光源的波长的光栅间距,(ii) 第一和第二物体,使得具有小于所使用的光源的波长的厚度的介电材料层插入在第一和第二物体之间,并且使得第一和第二物体的衍射光栅彼此相对(( iii)将来自光源的光投射到第一和第二物体的衍射光栅上,以及(iv)基于从衍射光栅投影到衍射光栅的衍射光来检测第一和第二物体之间的相对位置偏差。