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    • 5. 发明申请
    • Electron Beam Inspection System and an Image Generation Method for an Electron Beam Inspection System
    • 电子束检测系统和电子束检测系统的图像生成方法
    • US20090026369A1
    • 2009-01-29
    • US12179272
    • 2008-07-24
    • Hiroshi MIYAIYusuke OminamiYasuhiro Gunji
    • Hiroshi MIYAIYusuke OminamiYasuhiro Gunji
    • G21K1/00G01N23/00
    • G01N23/225H01J37/222H01J37/28H01J2237/24495H01J2237/2487H01J2237/2817
    • An object of the present invention is to provide an inspection system using a scanning electron microscope that detects a high-precision electron beam image and at the same time, removes restrictions for a low sampling rate, which presents a problem at this point, of an AD converter element and an inspection method.To achieve the object, an embodiment of the present invention is constructed so that a sampled signal is obtained by sampling an analog brightness signal generated by a secondary electron detector at a predetermined sampling rate, contiguous digital values contained in the sampled signal are added on a N by N digital value basis to generate a digital brightness signal whose frequency is equal to 1/N of the sampling frequency, and each digital value contained in the digital brightness signal is divided by N to generate a digital signal made of digital values having a number of bits equal to that of the sampled signal and to generate an image signal in which each digital value of the digital signal forms one pixel data.
    • 本发明的目的是提供一种使用扫描电子显微镜检测高精度电子束图像的检查系统,并且同时消除了在这一点上出现问题的低采样率的限制 AD转换器元件和检查方法。 为了实现该目的,本发明的一个实施例被构造成使得通过以预定采样率对由二次电子检测器产生的模拟亮度信号进行采样来获得采样信号,将包含在采样信号中的连续数字值加到 以N数字值为基础产生频率等于采样频率的1 / N的数字亮度信号,并且将包含在数字亮度信号中的每个数字值除以N,以产生由具有 位数等于采样信号的位数,并产生其中数字信号的每个数字值形成一个像素数据的图像信号。