Cold Field Emitters With Thick Focusing Grids.
Patent, Filed 25 Feb 94, Patented 21 Sep 99
DEPARTMENT OF THE NAVY WASHINGTON DC
Pagination or Media Count:
A field emitter for producing an electron beam includes at least one cold cathode unit. Each of the cold cathode units includes an emitter cone having an emitter tip and a gate spaced apart from the emitter tip for extracting electrons from the emitter tip in a propagation direction upon application of a positive dc voltage on the gate with respect to the emitter tip. The gate forms a gate cavity for propagation of the extracted electrons therethrough. Each of the cold cath- ode units further includes at least one lens electrode disposed further in the propagation direction from the emitter tip than the gate the at least one lens electrode forming at least one lens cavity for propagation of the extracted electrons therethrough. The at least one lens electrode is for focusing the extracted electrons in part of the gate cavity, part of the at least one lens cavity, and part of the region therebetween.
- Electrical and Electronic Equipment
- Electricity and Magnetism