Patent ID: 6067164
Filing Date: 2000-05-23
Classification: H01J

Abstract:
An electron optics system automatic adjustment apparatus for automatically adjusting an electron optics system of an electron optics device, comprising:a focal point adjustment unit for carrying out a focal point adjustment by changing a refractive index of an objective lens of the electron optics device;an image storage unit for storing a prescribed number of images sequentially obtained by the electron optics device at focal points adjusted by the focal point adjustment unit;a moving amount calculation unit for calculating a moving amount of a sample image in said prescribed number of images stored by the image storage unit;an adjustment processing control unit for judging whether an adjustment of the electron optics system of the electron optics device is necessary or not according to the moving amount of the sample image calculated by the moving amount calculation unit; andan optics system adjustment unit for adjusting the electron optics system of the electron optics device according to the moving amount of the sample image when the adjustment processing unit judges that the adjustment of the electron optics system of the electron optics device is necessary.