公开(公告)号：FR2669465A1

公开(公告)日：1992-05-22

申请号：FR9014287

申请日：1990-11-16

Applicant: THOMSON RECH

Inventor： DIDIER PRIBAT ,  BINH VU THIEN ,  PIERRE LEGAGNEUX

IPC: H01J3/18 ,  H01J1/304 ,  H01J3/02 ,  H01J9/02

Abstract: An electron source is provided, particularly as a point microcathode wherein a microcathode (MP) is located in a cavity (CA) of a dielectric (3). A first gate electrode (VG1) surrounds the cavity (CA) and a second gate electrode (VG2) surrounds the first gate electrode (VG1). The various electrodes have potentials such that the first gate electrode (VG1) acts as an extraction electrode while the second gate electrode acts as a focusing electrode. Applications: field effect microcathodes.