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    • 32. 发明授权
    • Charged particle beam apparatus
    • 带电粒子束装置
    • US07714288B2
    • 2010-05-11
    • US12149218
    • 2008-04-29
    • Tasuku YanoZhaohui ChengTakashi FurukawaOsamu Nasu
    • Tasuku YanoZhaohui ChengTakashi FurukawaOsamu Nasu
    • G21K7/00G21G5/00G01N23/00H01J3/14
    • G01N23/225H01J37/026H01J37/248H01J37/265H01J37/28H01J2237/004H01J2237/28
    • Electrification affected on a surface of a sample which is caused by irradiation of a primary charged particle beam is prevented when plural frames are integrated to obtain an image of a predetermined area of the sample in a charged particle beam apparatus. The predetermined area of the sample is scanned with a primary electron beam from an electron gun, and plural frames are generated and integrated while detecting generated secondary electrons with a detector to obtain the image of the predetermined area. If it is determined by a detection signal of the detector that an electrification amount at the predetermined area becomes a specified value when generating plural frames, an electricity removal voltage is applied to a boosting electrode to remove or reduce the electrification, prior to generation of the next frame. Accordingly, the signal-to-noise ratio of the image obtained by integrating plural frames can be improved.
    • 当多个帧被一体化以防止在带电粒子束装置中的样品的预定区域的图像时,防止了由一次带电粒子束的照射引起的样品表面影响的电气化。 用来自电子枪的一次电子束扫描样品的预定区域,并且用检测器检测产生的二次电子并产生并整合多个帧以获得预定区域的图像。 如果通过检测器的检测信号确定当产生多个帧时,预定区域的通电量变为规定值,则在生成多个帧之前将电去除电压施加到升压电极以去除或减少通电, 下一帧。 因此,可以提高通过对多个帧进行积分而获得的图像的信噪比。