Schottky emitter having extended life
Номер патента: EP1123558A1
Опубликовано: 16-08-2001
Автор(ы): David S. Jun, Gerald G. Magera, Gregory A. Schwind, James B. McGinn, Sander G. Den Hartog
Принадлежит: FEI Co
Опубликовано: 16-08-2001
Автор(ы): David S. Jun, Gerald G. Magera, Gregory A. Schwind, James B. McGinn, Sander G. Den Hartog
Принадлежит: FEI Co
Реферат: A electron emission cathode includes an emitter (102) having an apex (118) from which electrons are emitted. The emitter is attached to a heating filament (114) at a junction (116) and extends from the junction both forward toward the apex and rearward. A reservoir (130) of material that lowers the work function of the emitter is positioned on the rearward extending portion (128) of the emitter. By positioning the reservoir on the rearward extending portion, the reservoir can be positioned sufficiently far from the junction to reduce its temperature and thereby greatly increase the useful life of the emitter without adversely affecting the emission characteristics of the source.
Low input power schottky emitter
Номер патента: EP1256123A2. Автор: Gregory A. Schwind,James B. McGinn,Gerald G. Magera. Владелец: FEI Co. Дата публикации: 2002-11-13.