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    • 1. 发明授权
    • Method and apparatus for inspecting defects of a specimen
    • 用于检查样本缺陷的方法和装置
    • US06721047B2
    • 2004-04-13
    • US09944858
    • 2001-08-31
    • Atsushi ShimodaSachio UtoMinoru YoshidaShunji MaedaToshihiko Nakata
    • Atsushi ShimodaSachio UtoMinoru YoshidaShunji MaedaToshihiko Nakata
    • G01N2100
    • G01N21/95684
    • The object of the invention is to provide high-sensitivity detection of fine patterns on a transparent inter-layer insulative film and defects on the same layer. Detection is performed with lower-layer patterns and defects on the same layer defocused, thus allowing detection of just the defects from the process that is intended for inspection. An inspection apparatus for a specimen on which a plurality of patterns intended to have identical shapes are arranged in a uniform manner includes: an imaging optical system with a relationship between illumination wavelength and objective lens numerical aperture that provides a resolution of no more than 0.18 microns, or preferably no more than 0.13 microns; an opto-electric converter disposed at an imaging position of the imaging optical system; an auto-focus optical system formed with an optical path disposed separate from the imaging optical system, with illumination applied at an incident angle of at least 85 degrees, preferably at least 88 degrees; means for adjusting a focal position of the imaging optical system based on a detection signal from the auto-focus optical system; and means for processing electronic signals from the opto-electrical converter.
    • 本发明的目的是提供在透明层间绝缘膜上的精细图案的高灵敏度检测和同一层上的缺陷。 以相同层上的较低层图案和缺陷进行检测,散焦,从而允许仅检测来自用于检查的过程的缺陷。 用于其上具有相同形状的多个图案的样本的检查装置以均匀的方式布置包括:具有提供不超过0.18微米的分辨率的照明波长和物镜数值孔径之间的关系的成像光学系统 ,或优选不超过0.13微米; 设置在成像光学系统的成像位置处的光电转换器; 形成有与成像光学系统分开设置的光路的自动聚焦光学系统,其入射角至少为85度,优选为至少88度; 用于基于来自所述自动聚焦光学系统的检测信号调整所述成像光学系统的焦点位置的装置; 以及用于处理来自光电转换器的电子信号的装置。