To provide a method for generating a charged particle beam such as an electron beam, etc. for focusing the electron beam by suppressing the diffusion of the electron beam due to a space chargeeffect even when an electron density in the electron beam is increased and even when an exposure speed is accelerated, and to provide a charged particle beam device. 電子ビーム中の電子密度を増加させても露光速度を上げても、空間電荷効果による電子ビームの拡散を抑制して電子ビームを集束させる電子ビーム等の荷電粒子線の発生方法および荷電粒子線装置を提供する。 - 特許庁