公开(公告)号：US10475618B2

公开(公告)日：2019-11-12

申请号：US16041957

申请日：2018-07-23

Applicant: NEC Network and Sensor Systems, Ltd.

Inventor： Akira Chiba

IPC: H01J29/48 ,  H01J37/075

Abstract: To suppress both influence of electron emission from a cathode side surface and consumption of energy to be supplied to a heater, while being provided with a grid, an electron gun of the present invention includes: a cathode capable of emitting electrons by heating; a grid capable of controlling the electron emission; and a cathode shield which is an conductor including a material portion located in the vicinity of a side surface of the cathode and facing at least a portion of the side surface via a gap or a heat insulating material, and not being made in direct physical coupling nor in direct physical contact with the cathode.

公开(公告)号：US20190027335A1

公开(公告)日：2019-01-24

申请号：US16041957

申请日：2018-07-23

Applicant: NEC Network and Sensor Systems, Ltd.

Inventor： Akira Chiba

IPC: H01J29/48 ,  H01J37/075

Abstract: To suppress both influence of electron emission from a cathode side surface and consumption of energy to be supplied to a heater, while being provided with a grid, an electron gun of the present invention includes: a cathode capable of emitting electrons by heating; a grid capable of controlling the electron emission; and a cathode shield which is an conductor including a material portion located in the vicinity of a side surface of the cathode and facing at least a portion of the side surface via a gap or a heat insulating material, and not being made in direct physical coupling nor in direct physical contact with the cathode.