公开(公告)号：US10068741B2

公开(公告)日：2018-09-04

申请号：US15535722

申请日：2015-12-22

Applicant: MEIDENSHA CORPORATION

Inventor： Daizo Takahashi ,  Toshimasa Fukai ,  Toru Tanimizu

IPC: H01J35/04 ,  H01J35/06 ,  H01J35/12 ,  H01J35/16 ,  H01J1/304

Abstract: In a vacuum chamber (1), an emitter (3) and a target (7) are opposed to each other. A guard electrode (5) is disposed around an outer circumference of an electron generating portion (31) of the emitter (3). A supporting part (4) supports the emitter (3) movably in an end-to-end direction of the vacuum chamber (1). Reforming treatment is performed on the guard electrode (5) by operating the supporting part (4), moving the emitter (3) to an open end (21) side (non-discharge position) and applying a voltage to repeatedly effect discharge on the guard electrode (5) in a state where field emission from the electron generation portion (31) is suppressed. After the reforming treatment, the supporting part (4) is again operated. The emitter (3) is moved to an open end (22) side (discharge position) and placed in a state where field emission from the electron generation portion (31) is allowed.

公开(公告)号：US11342127B2

公开(公告)日：2022-05-24

申请号：US16960397

申请日：2018-10-16

Applicant: MEIDENSHA CORPORATION

Inventor： Osamu Takeya ,  Yoshiyuki Tanimizu ,  Toshimasa Fukai ,  Toshinori Tatsumi ,  Toru Tanimizu

IPC: H01G4/38 ,  H01G2/10 ,  H01G4/02 ,  H01G2/22

Abstract: A vacuum-capacitor-type instrument voltage transformer (1) is equipped with a main capacitor (2) and an insulating tube (3) that accommodates the main capacitor (2). A voltage dividing capacitor (4) is connected to the main capacitor (2) in series. The main capacitor (2) is equipped with a plurality of vacuum capacitors (2a) to (2c) that are connected in series. A high-voltage-side electrode (6) is provided on a high-voltage side of the insulating tube (3), and a ground-side electrode (7) is provided on its low-voltage side. The high-voltage-side electrode (6) is equipped with a high-voltage shield (8). Electrostatic capacity of the vacuum capacitor (for example, the vacuum capacitor (2a)) disposed on the high-voltage side is set to be greater than electrostatic capacity of the vacuum capacitor (for example, the vacuum capacitor (2b)) disposed on the low-voltage side.