公开(公告)号：US20020063500A1

公开(公告)日：2002-05-30

申请号：US09827918

申请日：2001-04-09

Applicant: Medirad I.R.T. Ltd.

Inventor： Hanan Keren

IPC: H01J007/26

CPC classification number: B82Y10/00 ,  A61N5/1001 ,  A61N5/1002 ,  H01J35/32 ,  H01J2201/30469 ,  H01J2235/1204 ,  H01J2235/1262 ,  H01J2235/164 ,  H01J2235/205

Abstract: An X-ray tube includes an evacuated envelope; a cold cathode mounted at one end of the envelope and capable of field emission of electrons when subjected to a high electrostatic field; and an anode mounted at the opposite end of the envelope coaxial with and axially spaced from the cathode, and capable of emitting X-rays when struck by electrons emitted by the cathode. The envelope includes an end wall made of thermally-conductive and electrically-insulating material in contact with the anode and formed with a fluid cooling channel to remove the heat generated at the anode. In one described embodiment, the cathode includes a body of a getter material which is both electron emissive and gas absorptive. In other described embodiments, the cathode includes a carbon nanotube field-emission electron source.

Abstract translation: X射线管包括抽真空的外壳; 安装在外壳一端的冷阴极，当经受高静电场时能够发射电子; 安装在与阴极同轴并且与阴极轴向间隔开的外壳的相对端处的阳极，并且能够在被阴极发射的电子撞击时发射X射线。 外壳包括由导热和电绝缘材料制成的端壁，其与阳极接触并形成有流体冷却通道以去除在阳极处产生的热量。 在一个所描述的实施例中，阴极包括吸气剂材料的主体，其既是电子发射的又是气体吸收的。 在其它描述的实施例中，阴极包括碳纳米管场致发射电子源。