Patent ID: 7791022
Filing Date: 2010-09-07
Classification: G01B,H01J

Abstract:
1. A scanning electron microscope with a length measurement function, comprising: an electron gun emitting an electron beam; a measurement target region setting unit for setting a measurement region where the measurement region is a pair of regions having the same areas each surrounding a corresponding edge of a pattern formed on a sample to measure a length of a pattern or one or more pairs of regions each of pair having the same areas each surrounding a corresponding edge of a plurality of patterns formed on the sample to measure a length between different patterns; a storing unit for storing position information on the designated measurement region; a beam blanker unit for controlling an irradiation of the electron beam depending on the measurement region; and a control unit, wherein the control unit extracts the position information of the designated measurement region from the storing unit, in a region other than the measurement region, the control unit interrupts the electron beam with the beam blanker unit, and in the measurement region, the control unit irradiates the electron beam passed through the beam blanker unit only onto the pair of regions with the same areas, captures an image of the measurement region, and thereby measures the length of the pattern.