Patent ID: 7067808

Claim:
An electron beam system, comprising: an electron beam source for emitting an electron beam; an electron optical system for irradiating the electron beam on a sample; a sample holder for holding the sample; a sample tilting section for tilting the sample holder and the irradiated electron beam relative to each other so that a stereo image can be acquired; an electron beam detecting section for detecting an electron beam outgoing from the sample; a first measuring section for finding a shape or coordinate values of the reference template held by the sample holder based on a stereo image of the reference template photographed by the electron beam detecting section while the reference template and the irradiated electron beam are tilted relative to each other by the sample tilting section; a calibration data preparing section adapted to compare measurement results of the reference template by the first measuring section with known reference data on the reference template, to prepare calibration data for a stereo image photographed by the electron beam detecting section; a calibration section for performing a calibration based on the calibration data so as to reduce aberration in an image of the sample detected by the electron beam detecting section; and a second measuring section for finding a shape or coordinate values of the sample based on a stereo image, photographed by the electron beam detecting section, of the sample placed in a tilt state made by the sample tilting section on the sample holder, the sample being calibrated by the calibration section.