Patent ID: 9042520
Filing Date: 2015-05-26
Classification: H01J

Abstract:
1. An electric field emission x-ray tube apparatus equipped with a built-in getter, comprising: a cathode configured to emit electrons through a field emitter; a gate configured to apply an electric field to the field emitter through a gate electrode with a gate hole; a focusing electrode configured to focus electrons emitted from the cathode; an anode generating x-rays when the focused electrons hits on an anode target; a getter; a getter housing unit configured to activate joule heat in the getter when external voltage is applied to both ends of the getter and maintaining the degree of vacuum by using the activated getter; and an exhausting unit configured to exhaust air between the anode and the getter housing unit through an exhausting pipe, wherein the exhausting unit, the getter housing unit, the cathode, the gate, the focusing electrode, and the anode are stacked in this order and are bonded together by a plurality of spacers such that electric insulation and predetermined gaps are maintained, wherein the getter is mounted in the getter housing unit that is placed under the cathode, and wherein the getter has a strip shape.