Patent ID: 9543053
Date: 2017-01-10
CPC Classifications: G21K,H01J

Claim:
1. An electron beam equipment comprising: an electron gun configured to emit primary electrons; an energy filter configured to pass electrons with predetermined energy; a stage configured to hold a sample; and an objective lens configured to irradiate the sample held on the stage with the primary electrons that have passed through the energy filter, wherein the energy filter includes a beam slit and a pair of a magnetic deflector and an electrostatic deflector that are superimposed with each other, wherein an electron lens is provided between the beam slit and the pair of the magnetic deflector and the electrostatic deflector, the electron lens being a round lens configured to converge primary electron beams onto the beam slit and to form an image of a virtual light source of the electron gun on the beam slit, and being arranged such that application of a voltage of negative 1 kV to each said electrostatic deflector causes a 50% reduction in an energy distribution of said primary electron beams, and wherein the pair of the magnetic deflector and the electrostatic deflector are configured for decelerating or moderating electrons.