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    • 53. 发明授权
    • Method of and apparatus for inspecting reticle for defects
    • 用于检查掩模版的缺陷的方法和装置
    • US06064477A
    • 2000-05-16
    • US644740
    • 1996-05-10
    • Shunichi MatsumotoHiroaki Shishido
    • Shunichi MatsumotoHiroaki Shishido
    • G01N21/88G01N21/93G01N21/94G01N21/956G03F1/32G03F1/84H01L21/027H01L21/30H01L21/66
    • G01N21/94G01N21/956G01N21/95607G01N21/95623G03F1/84
    • A reticle inspecting apparatus for inspecting a reticle for defects has a transparent of translucent substrate, a circuit pattern formed on the front surface of the substrate, and a phase shifter formed of a light-transmissive film on the front surface of the substrate. In the apparatus, a detection optical system is disposed so as not to gather directly reflected light and directly transmitted light and so as to gather scattered light and diffracted light which has been scattered and diffracted, respectively, by the reticle. This detection optical system enables separation of the gathered light by direction of illumination using detectors and spatial filters disposed respectively on Fourier transform planes to intercept light diffracted by straight edges of the circuit pattern, so as to form images of gathered light on the detectors. A signal processing system having a signal processing unit calculates defects on the basis of the output signals of the detectors and displays the calculated data on a display.
    • 用于检查掩模版用于缺陷的掩模版检查装置具有透光性的基板,形成在基板的前表面的电路图案,以及在基板的前表面上由透光膜形成的移相器。 在该装置中,检测光学系统被设置成不会直接聚集反射光并直接透射光,以分散散射光和被散射和衍射的衍射光。 该检测光学系统能够使用分别设置在傅立叶变换平面上的检测器和空间滤光器的照明方向来分离收集的光以截取由电路图案的直边衍射的光,从而在检测器上形成聚光的图像。 具有信号处理单元的信号处理系统基于检测器的输出信号计算缺陷,并将计算出的数据显示在显示器上。
    • 54. 发明授权
    • Foreign particle inspection apparatus
    • 国外颗粒检测仪器
    • US5410400A
    • 1995-04-25
    • US902819
    • 1992-06-23
    • Hiroaki ShishidoMinori Noguchi
    • Hiroaki ShishidoMinori Noguchi
    • G01N21/94G01N21/956G01N21/88
    • G01N21/94G01N21/95623
    • A foreign particle inspection apparatus includes a detection optical system (4) for condensing scattered light generated by slant illumination (2) by an optical system (41) with a NA of more than 0.4 from the rear side of a sample using a transparent or semitransparent substrate having an opaque circuit pattern. The circuit pattern, such as a reticle, etc., has a phase shift film for improving the patterning resolution, for shielding diffracted light from the circuit pattern by a spatial filter (44) mounted on the Fourier transform plane, and for forming images on a detector (51). A circuit (113) is also provided for correcting detected values of the detector according to uneven illumination, and a circuit for obtaining the added value of detected values of 2 by 2 pixels. A circuit (114) is provided for obtaining the maximum value of four added values which are shifted pixel by pixel in the four directions around each detector pixel. A circuit (112) is provided for storing the detected result in a memory where the substrate sample is divided into blocks every several hundreds pixels. By this arrangement small foreign particles of the order of submicrons adhered on the substrate can be separated and detected easily and stably from the circuit pattern principally using a simple optical structure.
    • 外来粒子检查装置包括检测光学系统(4),用于通过光学系统(41)将由倾斜照明(2)产生的散射光从样品的后侧以大于0.4的NA聚集,所述检测光学系统使用透明或半透明 衬底具有不透明的电路图案。 诸如掩模版等的电路图案具有用于改善图形分辨率的相移膜,用于通过安装在傅里叶变换平面上的空间滤光器(44)屏蔽来自电路图案的衍射光,并且用于在 检测器(51)。 还提供一种用于根据不均匀照明校正检测器的检测值的电路(113),以及用于获得2×2像素的检测值的相加值的电路。 提供电路(114),用于获得围绕每个检测器像素的四个方向逐个像素移位的四个相加值的最大值。 提供了一种电路(112),用于将检测结果存储在存储器中,其中衬底样品被分成几百个像素的块。 通过这种布置,主要使用简单的光学结构,可以从电路图案容易且稳定地分离和稳定地分离和检测附着在基板上的亚微米级的小的外来颗粒。