公开(公告)号：US20230197395A1

公开(公告)日：2023-06-22

申请号：US18008016

申请日：2021-05-26

Applicant: MEIDENSHA CORPORATION

Inventor： Takumi HAYASHI ,  Rena TAKAHASHI ,  Hayato OCHI

IPC: H01J35/06

CPC classification number: H01J35/064 ,  H01J35/065 ,  H01J2235/064

Abstract: opening edge surface (45a) of an emitter supporting unit female screw bore (45) provided at an emitter supporting unit (4) extends along radial direction of the emitter supporting unit female screw bore (45). An emitter supporting unit operation hole (32) provided at a flange portion (30a) of a vacuum enclosure (11) has shape into which one selected from a position adjustment shaft (6) and a pressing shaft (9) can be inserted from their shaft tip sides. The position adjustment shaft is provided, on an outer circumferential surface of its tip (61), with a tip side male screw portion (61a) that can be screwed into the emitter supporting unit female screw bore (45). The pressing shaft has, at its tip (91), a tip surface (91a) having a larger diameter than an opening diameter of the emitter supporting unit female screw bore (45) and extending along radial direction of the pressing shaft.

公开(公告)号：US20230298844A1

公开(公告)日：2023-09-21

申请号：US18028174

申请日：2021-08-02

Applicant: MEIDENSHA CORPORATION

Inventor： Takumi HAYASHI ,  Rena TAKAHASHI ,  Hayato OCHI

IPC: H01J35/14 ,  H01J35/06

CPC classification number: H01J35/14 ,  H01J35/065

Abstract: In a cylindrical guard electrode (5) provided on the outer peripheral side of an electron generation part (31) of an emitter (3), a distal end section (5A) 5 positioned in the emission direction of an electron beam (L1) from the electron generation part (31) includes: a distal end inner-peripheral-side part (A1) having an inner-peripheral-side curved surface portion (a1) convex in the emission direction; a distal end outer-peripheral-side part (A2) having an outer-peripheral-side curved portion (a2) convex in the emission direction; and a 10 distal end middle part (A3) positioned between the distal end inner-peripheral-side (A1) and the distal end outer-peripheral-side part (A2). The distal end middle part (A3) has a flat surface portion (a3) between the inner-peripheral-surface portion (a1) and the outer-peripheral-side curved surface portion (a2) so as to extend in the direction therebetween.

公开(公告)号：US20230199934A1

公开(公告)日：2023-06-22

申请号：US17927087

申请日：2021-05-12

Applicant: MEIDENSHA CORPORATION

Inventor： Takumi HAYASHI

IPC: H05G1/32 ,  H01J35/02

CPC classification number: H05G1/32 ,  H01J35/025

Abstract: A high voltage generator including a Cockcroft-Walton circuit structured to receive alternating-current power supplied from an alternating-current power source and apply a potential difference to a load includes: three or more circuit boards arranged at intervals in a thickness direction thereof; capacitors, each of which is shaped flat and mounted to a corresponding one of the circuit boards; and diodes, each of which is connected to corresponding ones of the circuit boards. Out of the three or more circuit boards, each circuit board other than two circuit boards disposed at both ends of the arrangement of the three or more circuit boards includes indentations. Each of the diodes is disposed in a corresponding one of the indentations.