Patent ID: 6534913
Filing Date: 2003-03-18
Classification: H01J

Abstract:
Microtip electron source comprising:at least one electron emission zone composed of a plurality of microtips connected electrically to a cathode conductor, at least one gate electrode, positioned opposite said electron emission zone and pierced with apertures located opposite the microtips, to extract the electrons from the microtips, an emitted electron focusing gate, positioned opposite the gate electrode, and comprising aperture means located opposite the microtips, the aperture means of the focusing gate comprising at least one slit located opposite at least two successive microtips, wherein the focusing gate is separated from the extraction gate electrode positioned opposite it by a layer of electrically insulating material comprising a slit aligned with the slit of the focusing gate, or a succession of holes aligned with the focusing gate slit, of a width less than that of the focusing gate slit.