Patent ID: 7939801

Claim:
An electron beam observation device comprising: a light source of an electron beam; an irradiation optical system for irradiating the electron beam emitted from the light source to a specimen; an objective lens which comprises an exciting coil, a magnetic yoke and a magnetic pole piece and forms an image of the specimen; a lens system for magnifying and observing the specimen image; a first port which is disposed at an upstream side in an electron beam traveling direction from the objective lens and for insertion of a first specimen holding device for mounting a specimen on an optical axis of the light source; and a second port for insertion of a second specimen holding device for mounting a specimen between the magnetic pole pieces, wherein the first specimen holding device and the second specimen holding device are disposed so that an image of a specimen mounted on the first specimen holding device can be formed within a specimen mounting surface of the second specimen holding device so that a magnification becomes 1/30 to ⅕, by a magnetic field which is at an upstream side in the electron traveling direction from the specimen mounting surface of the second specimen holding device, and is generated by the objective lens.