Tiltable or deflectable anode x-ray tube

• US 9,184,020 B2
• Filed: 01/24/2014
• Issued: 11/10/2015
• Est. Priority Date: 03/04/2013
• Status: Active Grant

• Current Assignee: Moxtek (Polatechno Co.,Ltd.)
• Original Assignee: Moxtek (Polatechno Co.,Ltd.)
• Inventors: Parker, Todd S.
• Primary Examiner(s): Maskell, Michael
• Application Number:
  US14/163,441
• Publication Number:
  US 20140247921A1
• Time in Patent Office: 655 Days
• Field of Search: 378/124, 378/125, 378/126, 378/143
• US Class Current: 1/1
• CPC Class Codes: H01J 2235/081 Target material
• CPC Class Codes: H01J 2235/086 Target geometry
• CPC Class Codes: H01J 35/10 Rotary anodes; Arrangements for rotating anodes; Cooling rotary anodes
• CPC Class Codes: H01J 35/116 Transmissive anodes acting as a window H01J35/186
• CPC Class Codes: H01J 35/14 Arrangements for concentrating, focusing, or directing the cathode ray
• CPC Class Codes: H01J 35/16 Vessels; Containers; Shields associated therewith
• CPC Class Codes: H01J 35/186 used as targets or X-ray converters
• CPC Class Codes: H01J 35/24 Tubes wherein the point of impact of the cathode ray on the anode or anticathode is movable relative to the surface thereof
• CPC Class Codes: H01J 35/28 by vibration, oscillation, reciprocation, or swash-plate motion of the anode or anticathode

Abstract

A x-ray tube comprising an anode sealed to a flexible coupling. The flexible coupling can allow the anode to deflect or tilt in various directions to allow an electron beam to impinge upon various selected regions of an anode target.

A method of utilizing different regions of an x-ray tube target by tilting or deflecting an x-ray tube anode to cause an electron beam to impinge on a selected region of the target.

Claims

1. An x-ray tube comprising:

a. an electron emitter, a flexible coupling with a coupling axis, and a window hermetically sealed to an enclosure;

b. an anode attached to the flexible coupling;

c. the electron emitter configured to emit electrons from the electron emitter to the anode;

d. the anode including a target configured to produce x-rays in response to impinging electrons from the electron emitter;

e. the anode spaced-apart from the window by a gap through which the x-rays emitted from the target travel to the window;

f. the anode being selectively tiltable in all directions from the coupling axis outward to a circle around the coupling axis to selectively position a region of the target material in the electron beam.

2. The x-ray tube of claim 1, wherein the anode extends through a core of the flexible coupling.

3. The x-ray tube of claim 1, wherein a first end of the flexible coupling is hermetically sealed to the enclosure and a second end of the flexible coupling is attached to the anode.

4. The x-ray tube of claim 1, wherein the target material faces the electron emitter and the window in all directions in which the anode is tilted.

5. The x-ray tube of claim 1, wherein the electron emitter is disposed at one end of the enclosure, the anode is disposed at an opposite end of the enclosure, and the window is a side-window disposed along a side of the enclosure between the electron emitter and the anode.

6. The x-ray tube of claim 1, wherein the electron emitter is disposed at one end of the enclosure, the window is disposed at an opposite end of the enclosure, and the anode is disposed along a side of the enclosure between the electron emitter and the window.

7. The x-ray tube of claim 1, wherein the target is disposed on a target face portion of the anode, the target face is tilted at an acute angle with respect to an electron beam axis defined by electrons traveling from the electron emitter to the anode, and the target face is tilted towards the window.

8. The x-ray tube of claim 1, wherein:

a. the target includes at least two different regions;

b. at least one of the regions is a target well region including a cavity; and

c. the target well region is configured to block x-rays from being emitted through the window.

9. The x-ray tube of claim 1, wherein the target includes at least two different regions, each region having a different target material than at least one other region, the different target materials configured to change a characteristic of the x-rays emitted therefrom.

10. The x-ray tube of claim 1, wherein:

a. an electron beam axis extends, at an approximate center of the electron beam, between the electron emitter and the anode;

b. the anode is positioned with the electron beam axis impinging on a non-central region of the target; and

c. tilting the anode in another direction causes the electron beam axis to impinge on a different non-central region of the target.

11. The x-ray tube of claim 1, wherein:

a. a longitudinal anode axis forms an acute angle with respect to the coupling axis as the coupling is flexed to a side; and

b. the acute angle orbits around the coupling axis by flexing the coupling in different directions.

12. The x-ray tube of claim 1, further comprising:

a. a ring rotatably coupled around the flexible coupling;

b. the ring including a cavity;

c. the anode extends from an interior of the enclosure, through a core of the flexible coupling, and into the cavity;

d. the cavity sized and shaped to receive and engage the anode;

e. the cavity being offset with respect to a center of the ring;

f. the cavity causing the anode to tilt at an acute angle with respect to the coupling axis; and

g. rotation of the ring causing the anode to tilt in different directions to allow the acute angle of the anode to orbit around the coupling axis.

13. An x-ray tube comprising:

a. an electron emitter, a flexible coupling with a coupling axis, and a window hermetically sealed to an enclosure;

b. an anode attached to, and extending through a core of, the flexible coupling;

c. the electron emitter configured to emit electrons from the electron emitter to the anode;

d. the anode including a target configured to produce x-rays in response to impinging electrons from the electron emitter;

e. the anode spaced-apart from the window by a gap through which the x-rays emitted from the target travel to the window;

f. the anode being selectively deflectable in all directions from the coupling axis outward to a circle around the coupling axis to selectively position a region of the target material in the electron beam.

14. The x-ray tube of claim 13,

a. a ring rotatably coupled around the flexible coupling;

b. the ring including a cavity;

c. the anode extends from an interior of the enclosure, through a core of the flexible coupling, and into the cavity;

d. the cavity sized and shaped to receive and engage the anode;

e. the cavity causing the anode to deflect with respect to the coupling axis; and

f. rotation of the ring causing the anode to deflect in different directions to allow an anode axis to orbit around the coupling axis.

15. The x-ray tube of claim 13, wherein the electron emitter is disposed at one end of the enclosure, the anode is disposed at an opposite end of the enclosure, and the window is a side-window disposed along a side of the enclosure between the electron emitter and the anode.

16. The x-ray tube of claim 13, wherein the electron emitter is disposed at one end of the enclosure, the window is disposed at an opposite end of the enclosure, and the anode is disposed along a side of the enclosure between the electron emitter and the anode.

17. The x-ray tube of claim 13, wherein:

a. the target includes at least two different regions;

b. at least one of the regions is a target well region including a cavity substantially lower than an adjacent target region; and

c. the target well region configured to block x-rays from being emitted through the window.

18. The x-ray tube of claim 13, wherein the target includes at least two different regions, each region having a different target material than at least one other region, the different target materials configured to change a characteristic of the x-rays emitted therefrom.

19. The x-ray tube of claim 13, wherein:

a. an electron beam axis extends between the electron emitter and the anode at an approximate center of the electron beam;

b. the anode is positioned with the electron beam axis impinging on a non-central region of the target; and

c. deflecting the anode in another direction causes the electron beam axis to impinge on a different non-central region of the target.

20. A method of utilizing different regions of an x-ray tube target, the method comprising:

a. disposing a target in an electron beam, the target being disposed at an end of an anode and configured to produce x-rays in response to impinging electrons;

b. emitting x-rays from the target to an x-ray tube window through a gap between the target and the window;

c. deflecting or tilting the anode in all directions in a 360 degree circle to selectively position a region of the target in the electron beam.