Patent ID: 8772715
Filing Date: 2014-07-08
Classification: H01J

Abstract:
1. An electron beam device comprising: an electron source; an acceleration tube that brings an electron emitted from the electron source into an electron beam at a predetermined velocity; an irradiation lens system that irradiates a specimen with the electron beam; a specimen holder that holds the specimen; an objective lens system that includes at least one electron lens for forming an image of the specimen; an image forming lens system that forms the image of the specimen, which has been formed by the objective lens system; an observation plane for observation of the specimen image formed by the image forming lens system; an observation recording system for observing or recording the specimen image formed on the observation plane; a first electron biprism provided between the acceleration tube and the irradiation lens system for splitting the electron beam into a first electron beam and a second electron beam; and at least one electron biprism provided in the image forming lens system for superposing the first electron beam and the second electron beam on the observation plane, wherein: an optical action of the irradiation lens system controls each current density of the first electron beam and the second electron beam on an objective plane of the objective lens system where the specimen exists, and a distance on electron optics between the first electron biprism and the objective plane of the objective lens system where the specimen exists; a first region and a second region differently positioned on the objective plane of the objective lens system are irradiated with the first electron beam and the second electron beam, respectively; and a superposed region of the first electron beam and the second electron beam on the observation plane is observed or recorded by the observation recording system.