Patent ID: 7839248
Filing Date: 2010-11-23
Classification: F02P,H01F,H02K,Y10T

Abstract:
1. A field emission system, comprising: a first field emission structure, said first field emission structure comprising a first plurality of field emission sources having positions and polarities in accordance with a spatial force function, said first plurality of field emission sources being arranged in a first circular ring, and a first additional field emission source located at the center of said first circular ring, said first additional field emission source being a first biasing field emission source; and a second field emission structure, said second field emission structure comprising a second plurality of field emission sources having positions and polarities in accordance with said spatial force function, said second plurality of field emission sources being arranged in a second circular ring, said spatial force function being in accordance with a code, said code corresponding to a code modulo of said first field emission structure and a code modulo of a second field emission structure, said code defining a peak spatial force corresponding to substantial alignment of said code modulo of said first field emission structure with said code modulo of said second field emission structure, said code also defining a plurality of off peak spatial forces corresponding to a plurality of different misalignments of said code modulo of said first field emission structure and said code modulo of said second field emission structure, said plurality of off peak spatial forces having a largest off peak spatial force, said largest off peak spatial force being less than half of said peak spatial force.