Patent ID: 8559599
Filing Date: 2013-10-15
Classification: H01J

Abstract:
1. An x-ray generation device, comprising: a cathode having a base and a side wall forming a trench shaped container, a plurality of metal bars mounted on said base in said trench and each of said metal bars having a diameter between about 0.1 mm to 3 mm, wherein each of said metal bars have a carbon layer grown thereupon including an interlayer and an emission layer; an anode target; a glass chamber for housing said cathode, a focusing device, and said anode target in sequence; wherein said x-ray generation device can be operated with a starting electric field 0.3 V/μm for generating an electron current density over 1 mA/cm 2 without using a gate voltage between said anode target and said cathode as its accelerating field.