公开(公告)号：US09224572B2

公开(公告)日：2015-12-29

申请号：US13718672

申请日：2012-12-18

Applicant: General Electric Company

Inventor： Mark Alan Frontera ,  John Scott Price ,  Sergio Lemaitre ,  Yun Zou ,  Peter Andras Zavodszky

IPC: H01J35/14 ,  H01J35/04

CPC classification number: H01J35/14 ,  H01J35/045

Abstract: An X-ray tube assembly is provided including an emitter configured to emit an electron beam, an emitter focusing electrode, an extraction electrode, and a downstream focusing electrode. The emitter focusing electrode is disposed proximate to the emitter and outward of the emitter in an axial direction. The extraction electrode is disposed downstream of the emitter and the emitter focusing electrode. The extraction electrode has a negative bias voltage setting at which the extraction electrode has a negative bias voltage with respect to the emitter. The downstream focusing electrode is disposed downstream of the extraction electrode, and has a positive bias voltage with respect to the emitter. When the extraction electrode is at the negative bias voltage setting, the electron beam is emitted from an emission area that is smaller than a maximum emission area from which electrons may be emitted.

Abstract translation: 提供了包括发射电子束的发射极，发射极聚焦电极，引出电极和下游聚焦电极的X射线管组件。 发射极聚焦电极在轴向方向上靠近发射极和发射极的外侧设置。 引出电极设置在发射极和发射极聚焦电极的下游。 提取电极具有负偏置电压设置，在该设置下，引出电极相对于发射极具有负偏置电压。 下游聚焦电极设置在引出电极的下游，并且相对于发射极具有正偏置电压。 当提取电极处于负偏置电压设置时，电子束从小于可从其发射电子的最大发射区域的发射区域发射。