公开(公告)号：US3921078A

公开(公告)日：1975-11-18

申请号：US40991873

申请日：1973-10-26

Applicant: JEOL LTD

Inventor： AIHARA RYUZO ,  OTA SUSUMU ,  KOBAYASHI NOBUYUKI

IPC: G01Q20/00 ,  H01J37/073 ,  H01J37/24 ,  H02H7/20 ,  H02H7/09 ,  H01J37/285

CPC classification number: H01J37/241 ,  H01J37/073 ,  H02H7/20

Abstract: This invention relates to a field emission type electron gun capable of protecting the emitter tip from damage when electrical breakdown occurs in the gun chamber. The preferred embodiments incorporate circuitry for decreasing the impedance between the emitter and its associated electrode when electrical breakdown occurs.

Abstract translation: 本发明涉及一种场致发射型电子枪，能够在枪室发生电击穿时保护发射极尖免受损坏。 优选的实施例结合电路，用于当发生电击穿时减小发射极及其相关电极之间的阻抗。

公开(公告)号：US3887839A

公开(公告)日：1975-06-03

申请号：US37793273

申请日：1973-07-10

Applicant: JEOL LTD

Inventor： OTA SUSUMU ,  AIHARA RYUZO

IPC: H01J1/304 ,  H01J3/02 ,  H01J37/073 ,  H01J29/52

CPC classification number: H01J3/021

Abstract: A pulsed field emission type electron gun in which the pulse voltage peak between the heated emitter and its associated electrode is maintained constant, and the pulse duty factor or emitter heating temperature of bias voltage is controlled to keep the field emitted electron beam constant, during the pulse rest time, thereby prolonging the life of the emitter regardless of any discrepancy between the radius of curvature of one emitter and another.

Abstract translation: 一种脉冲场发射型电子枪，其中加热的发射极及其相关电极之间的脉冲电压峰值保持恒定，并且控制偏置电压的脉冲占空比或发射极加热温度以保持场发射的电子束恒定， 脉冲休止时间，从而延长发射器的寿命，而不管一个发射器与另一个发射器的曲率半径之间有任何差异。