X-ray tube with enhanced small spot cathode and methods for...

H - Electricity – 01 – J

Patent

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H01J 35/06 (2006.01)

Patent

CA 2697845

An x-ray source produces a well-defined electron beam, without an undesirable halo. The x-ray source includes a housing, a cathode disposed within the housing, an anode spaced apart from the cathode for accelerating electrons emitted from the cathode and an x-ray emitter target disposed within the housing and spaced apart from the cathode for impact by the accelerated electrons. The cathode includes a passivation layer (210) over only a portion of the area of the cathode, leaving an emission portion (215) of the cathode that is not passivated. The passivation layer reduces or prevents emissions from the passivated portion of the cathode, thereby preventing a halo, which would otherwise be produced by lower- level emissions from the portion of the cathode that surrounds the emission portion of the cathode.

L'invention concerne une source de rayons X qui produit un faisceau d'électrons bien défini, sans halo indésirable. La source de rayons X comprend un boîtier, une cathode disposée à l'intérieur du boîtier, une anode espacée de la cathode pour accélérer des électrons émis par la cathode et une cible émettrice de rayons X disposée à l'intérieur du boîtier et espacée de la cathode pour être frappée par les électrons accélérés. La cathode comprend une couche de passivation (210) sur une partie seulement de l'aire de la cathode, en laissant une partie d'émission (215) de la cathode qui n'est pas passivée. La couche de passivation réduit ou empêche des émissions à partir de la partie passivée de la cathode, empêchant ainsi un halo, qui serait autrement produit par des émissions à plus bas niveau par la partie de la cathode qui entoure la partie d'émission de la cathode.

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