Anode and X-ray generating tube, X-ray generating apparatus, and radiography system that use the anode

Patent metadata

Field	Value
Publication number	US-10242837-B2
Application number	US-201514926666-A
Country	US
Kind code	B2
Filing date	Oct 29, 2015
Priority date	Nov 12, 2014
Publication date	Mar 26, 2019
Grant date	Mar 26, 2019

Abstract

Provided is an anode for an X-ray generating tube, which reduces a drop in the quality of an emitted X-ray due to the history of X-ray emitting operation. A target layer is formed on the inside of the edge of a support substrate. An end portion of an extended portion of a joining member, which protrudes over a support surface of the support substrate, is covered with a conductive member higher in melting point than the joining member. The conductive member is electrically connected to the target layer, thereby electrically connecting the joining member to the target layer.

First claim

What is claimed is:

1. An anode for an X-ray generating tube comprising:
a target layer configured to generate an X-ray;
a support substrate, which extends farther outwardly than an edge of the target layer, the support substrate comprising a support surface where the target layer is supported and a side surface connected to the support surface circumferentially;
a joining member including an extended portion which extends from the side surface to the support surface;
a tubular anode member, which is joined to the side surface via the joining member; and
a conductive layer having a melting point higher than a melting point of the joining member and which is configured to electrically connect the target layer and the joining member,
wherein the conductive layer is laid over the support surface and the extended portion of the joining member.

2. The anode according to claim 1 , wherein the conductive layer covers the edge of the target layer.

3. The anode according to claim 1 , wherein the conductive layer covers the joining member in a ring pattern.

4. The anode according to claim 1 , wherein the joining member is lower in melting point than any one of the support substrate, the target layer, and the tubular anode member.

5. The anode according to claim 4 , wherein the joining member is made of a brazing filler metal.

6. The anode according to claim 4 , wherein the support substrate is made of diamond.

7. The anode according to claim 1 , wherein the support substrate is joined to a tubular interior of the tubular anode member.

8. The anode according to claim 1 , wherein the side surface comprises a surface that is continuous in a ring pattern along an edge of the support surface.

9. The anode according to claim 1 ,
wherein the support substrate is configured to transmit the X-ray generated in the target layer and emit the X-ray from a surface opposite from the support surface, and
wherein the target layer and the support substrate form a transmissive target.

10. An X-ray generating tube comprising:
an anode according to claim 1 ;
a cathode comprising an electron emitting source configured to emit electrons toward the target layer; and
an insulating tube configured to insulate the anode and the cathode and to form a vacuum container together with the anode and the cathode.

11. An X-ray generating apparatus comprising:
an X-ray generating tube according to claim 10 ; and
a tube voltage circuit configured to apply a tube voltage to the cathode and the anode of the X-ray generating tube.

12. A radiography system comprising:
an X-ray generating apparatus according to claim 11 ;
an X-ray detecting apparatus configured to detect an X-ray that has been emitted from the X-ray generating apparatus and transmitted through a subject; and
a system control apparatus configured to control the X-ray generating apparatus and the X-ray detecting apparatus in a coordinated manner.

13. The anode according to claim 1 , wherein the conductive layer is coated on the support surface and the extended portion.

14. An anode for an X-ray generating tube comprising:
a target layer configured to generate an X-ray;
a support substrate, which extends farther outwardly than an edge of the target layer, the support substrate comprising a support surface where the target layer is supported;
a tubular anode member, which is joined to a side surface of the support substrate via a joining member, the joining member comprising an extended portion, which extends from the side surface to the support surface; and
a conductive layer that has a melting point higher than a melting point of the joining member,
wherein the joining member is electrically connected to the target layer by covering the extended portion with the conductive layer, and
wherein the conductive layer comprises the target layer.

15. The anode according to claim 14 , wherein the conductive layer covers the joining member in a ring pattern.

16. The anode according to claim 14 , wherein the joining member is lower in melting point than any one of the support substrate, the target layer, and the tubular anode member.

17. The anode according to claim 16 , wherein the joining member is made of a brazing filler metal.

18. The anode according to claim 16 , wherein the support substrate is made of diamond.

19. The anode according to claim 14 , wherein the support substrate is joined to a tubular interior of the tubular anode member.

20. The anode according to claim 14 , wherein the side surface comprises a surface that is continuous in a ring pattern along an edge of the support surface.

21. The anode according to claim 14 , wherein the support substrate is configured to transmit the X-ray generated in the target layer and emit the X-ray from a surface opposite from the support surface, and
wherein the target layer and the support substrate form a transmissive target.

22. An X-ray generating tube comprising:
an anode according to claim 14 ;
a cathode comprising an electron emitting source configured to emit electrons toward the target layer; and
an insulating tube configured to insulate the anode and the cathode and to form a vacuum container together with the anode and the cathode.

23. An X-ray generating apparatus comprising:
an X-ray generating tube according to claim 22 ; and
a tube voltage circuit configured to apply a tube voltage to the cathode and the anode of the X-ray generating tube.

24. A radiography system comprising:
an X-ray generating apparatus according to claim 23 ;
an X-ray detecting apparatus configured to detect an X-ray that has been emitted from the X-ray generating apparatus and transmitted through a subject; and
a system control apparatus configured to control the X-ray generating apparatus and the X-ray detecting apparatus in a coordinated manner.

Assignees

• Canon Kk

Inventors

• Yamada Shuji
• Ito Nobuhiro
• Ogura Takao

Classifications

• H01J2235/088

  Laminated targets, e.g. plurality of emitting layers of unique or differing materials · CPC title

• H01J35/08 Primary

  Anodes; Anti cathodes · CPC title

• H01J2235/186

  Electricity · mapped topic

• H05G1/30

  Controlling · CPC title

• H01J2235/086

  Target geometry · CPC title