Patent ID: 8742341

Claim:
An electron beam apparatus comprising: means for applying an electron beam to a sample; means for macro-projecting electrons, which obtained information of the surface of said sample with application of said electron beam to said sample, to form an image on a detector; and means for synthesizing as an image said electrons made to form an image on the detector, wherein the shape of the irradiation area in which said electron beam is applied to said sample is approximately symmetric with respect to two axes orthogonal to the optical axis of said electron beam, the illuminance of said electron beam in said irradiation area is uniform, said means for applying an electron beam and said means for forming an image are an optical system comprised of an electrostatic lens, said means for synthesizing comprises means for multiplying said electrons, means for converting said electrons multiplied by said multiplying means into light, and a TDI sensor for converting light from said means for converting electrons into light into electric signals for images, the voltage of said electrostatic lens is adjusted to determine a pixel size on the surface of said sample for obtaining a desired magnification of macro-projection based on the pixel size of said TDI sensor, said means for synthesizing is provided with a vacuum column having a feed-through flange, and said electrical signals for images are supplied through said feed-through flange to a TDI camera disposed outside of the vacuum column.