Patent ID: 7136455
Filing Date: 2006-11-14
Classification: A61B,H01J

Abstract:
1. An electron emitter assembly, comprising: a laser configured to emit a first light beam; a lens assembly configured to receive the first light beam, the lens assembly configured to adjust a size of the first light beam between a first predetermined size and a second predetermined size larger than the first predetermined size, the lens assembly emitting the first light beam toward a photo-cathode; the photo-cathode being configured to emit a first electron beam having a third predetermined size when the first light beam having the first predetermined size contacts the photo-cathode, the photo-cathode being further configured to emit a second electron beam having a fourth predetermined size when the first light beam having the second predetermined size contacts the photo-cathode; and an anode configured to receive the first and second electrons beams from the photo-cathode.