公开(公告)号：US20190341218A1

公开(公告)日：2019-11-07

申请号：US16309238

申请日：2017-03-16

Applicant: MEIDENSHA CORPORATION

Inventor： Daizo TAKAHASHI ,  Toshinori TATSUMI ,  Michihiro HATANAKA

IPC: H01J35/06 ,  H01J35/16 ,  H05G1/02 ,  H01J35/12

Abstract: Emitter (3) and target (7) are arranged so as to face each other in vacuum chamber (1), and guard electrode (5) is provided at outer circumferential side of electron generating portion (31) of emitter (3). Guard electrode (5) is supported movably in directions of both ends of vacuum chamber (1) by guard electrode supporting unit (6). To perform regeneration process of guard electrode (5), guard electrode (5) is moved to opening (22) side (to separate position) by operating guard electrode supporting unit (6), and a state in which field emission of electron generating portion (31) is suppressed is set, then by applying voltage across guard electrode (5), discharge is repeated. After performing regeneration process, by operating guard electrode supporting unit (6) again, guard electrode (5) is moved to opening (21) side (to emitter position), and a state in which field emission of electron generating portion (31) is possible is set.