Title:
【発明の名称】入射粒子からエミッタを保護する手段を有する光電装置
Document Type and Number:
Japanese Patent JPH10508982
Kind Code:
A
Abstract:
An electron has an electron-emitting region, a longitudinal axis and an arrangement of apertured electron grids along the axis. A first grid has an aperture for passing electrons, which aperture is located further outwards with respect to the longitudinal axis than the emitting region. One of the other grids is provided with a shield so as to shield the edge wall of the aperture, if it is located within direct view of the electron-emitting region, from incidence of positive ions.
Inventors:
Haring Frederik Christiaan
Saegusa Koji
Saegusa Koji
Application Number:
JP51101797A
Publication Date:
September 02, 1998
Filing Date:
August 26, 1996
Export Citation:
Assignee:
Philips Electronics Nemrose Fennaught Shap
International Classes:
H01J3/02; H01J1/30; H01J1/308; H01J1/46; H01J3/40; H01J29/04; H01J29/48; H01J29/50; H01J29/84; (IPC1-7): H01J3/02; H01J1/30; H01J29/04; H01J29/48; H01J29/50
Attorney, Agent or Firm:
Akihide Sugimura (6 others)