X-ray tube to power supply connector

• US 8,817,950 B2
• Filed: 06/11/2012
• Issued: 08/26/2014
• Est. Priority Date: 12/22/2011
• Status: Expired due to Fees

• Current Assignee: Moxtek Inc (Nippon Kayaku Company Limited)
• Original Assignee: Moxtek Inc (Nippon Kayaku Company Limited)
• Inventors: Hansen, William H., Taylor, Brian L., Reynolds, Dave, Wang, Dongbing
• Primary Examiner(s): Yun, Jurie
• Application Number:
  US13/493,695
• Publication Number:
  US 20130163725A1
• Time in Patent Office: 806 Days
• Field of Search: 378/101, 378/102
• US Class Current: 378/101
• CPC Class Codes: H01R 13/2421 using coil springs
• CPC Class Codes: H01R 13/53 Bases or cases for heavy duty; Bases or cases for high voltage with means for preventing corona or arcing
• CPC Class Codes: H01R 13/533 Bases, cases made for use in extreme conditions, e.g. high temperature, radiation, vibration, corrosive environment, pressure H01R13/52 takes precedence
• CPC Class Codes: H01R 2103/00 Two poles
• CPC Class Codes: H05G 1/10 Power supply arrangements for feeding the X-ray tube supply circuits with converters in general H02M; supply circuits for emitters and amplifiers H04B1/16 - H04B1/1623

Abstract

An x-ray source can include an x-ray tube and a power supply. The x-ray tube can be removably affixed to the power supply in a rigid manner with the x-ray tube movable and holdable along with the power supply when affixed thereto. A releasable coupling between the x-ray tube and the power supply can create an interface defining a potential arc path. A means, such as a non-linear plug and socket junction, a gasket, or an electrically conductive sleeve, can be used for resisting arcing along the potential arc path.

Claims

1. An x-ray source device, comprising:

a. a power supply and an x-ray tube electrically, physically and releasably coupled together at a coupling formed therebetween;

b. the coupling comprising;

i. a plug extending from one of the power supply or the x-ray tube and a socket extending in towards the other of the power supply or the x-ray tube;

ii. a plug annular surface surrounding the plug at a base thereof and a socket annular surface surrounding the socket at a leading edge thereof;

iii. the plug having a tapered surface and a continuously reduced diameter from the base towards an end of the plug;

iv. the socket having a tapered surface and a continuously reduced diameter from the leading edge towards a bottom of the socket;

v. mating electrical connectors associated with the plug and the socket defining plug connectors and socket connectors, respectively, connecting when the plug is disposed in the socket, the electrical connectors configured to allow electrical current to flow from the power supply to the tube when connected;

vi. the tapered surfaces, the annular surfaces, or both, having a non-linear cross-sectional profile;

vii. the tapered surfaces and the annular surfaces of the plug and the socket substantially mating, with the plug insertable and receivable in the socket; and

viii. the plug, and material forming the socket, comprising elastic, electrically insulative material; and

c. the tapered surfaces abutting one another when coupled.

2. The device of claim 1, wherein:

a. the plug comprises a core region immediately surrounding the plug connectors and an outer region surrounding the core region;

b. a Durometer Shore A hardness of the core region divided by a Durometer Shore A hardness of the outer region is between 1.5 and 2.4.

3. The device of claim 2, wherein a Durometer Shore A hardness of the material forming the socket divided by the Durometer Shore A hardness of the outer region is between 0.95 and 1.05.

4. The device of claim 2, wherein the Durometer Shore A hardness of the outer region is between 40 and 60.

5. The device of claim 1, wherein:

a. the plug connectors are disposed at the end of the plug and the socket connectors are disposed at the bottom of the socket;

b. the plug connectors or the socket connectors including a central spring loaded pin connector and a first ring connector surrounding the pin connector and electrically insulated from the pin connector;

c. electrical connectors associated with the other of the plug or the socket including a plate connector and a second ring connector, the plate connector electrically insulated from the second ring connector; and

d. the pin connector electrically contacting the plate connector and the first ring connector electrically contacting the second ring connector when the plug and the socket are coupled together.

6. The device of claim 1, wherein:

a. the non-linear cross-sectional profile includes a stepped profile on the tapered surface of the plug, comprising at least two steps, each step including an abrupt reduction in plug diameter;

b. the steps of the plug include longitudinal segments and radial segments;

c. the longitudinal segments having a smaller angle than the radial segments with respect to a centerline of the plug;

d. the non-linear cross-sectional profile includes a stepped profile on the tapered surface of the socket, comprising at least two steps, each including an abrupt reduction in socket diameter; and

e. the stepped profiles of the plug and the socket mating with one another.

7. The device of claim 6, wherein the at least two steps comprises at least three steps.

8. The device of claim 6, wherein the angle between the radial segments and the centerline of the plug minus the angle between the longitudinal segments and the centerline of the plug is between 55 degrees and 75 degrees.

9. The device of claim 6, wherein the diameter of the plug is oversized to allow contact between longitudinal segments of the plug and the socket before contact between radial segments of the plug and socket, when coupling the power supply and the x-ray tube together.

10. The device of claim 6, wherein the longitudinal segments are at least three times longer than the radial segments.

11. A device in accordance with claim 1, wherein the socket is press fit with the plug having a lateral width greater than a corresponding lateral width of the socket at corresponding locations along a longitudinal length thereof.

12. The device of claim 1, wherein:

a. a plane of the plug annular surface is substantially perpendicular to a centerline of the plug;

b. a plane of the socket annular surface is substantially perpendicular to a centerline of the socket.

13. The device of claim 1, wherein:

a. the power supply is configured to provide, and the tube is configured to be operated at, a voltage of at least 39 kilovolts between a cathode and an anode of the x-ray tube;

b. an electron flight distance, from an electron emitter to a target of the x-ray tube, is less than 1 inch; and

c. a distance from a plane of the plug annular surface along a centerline of the plug to the end of the plug is less than 30 millimeters.

14. The device of claim 1, wherein:

a. the annular surfaces comprise elastic, electrically insulative material;

b. the non-linear cross-sectional profile includes annular grooves on one of the plug annular surface or the socket annular surface and mating annular ridges on the other of the plug annular surface or the socket annular surface;

c. the annular surfaces abutting one another when coupled.

15. The device of claim 1, wherein:

a. the annular surfaces comprise elastic, electrically insulative material;

b. the non-linear cross-sectional profile includes annular grooves on the plug annular surface and mating annular ridges on the socket annular surface;

c. the non-linear cross-sectional profile includes annular grooves on the socket annular surface and mating annular ridges on the plug annular surface;

d. the annular surfaces abutting one another when coupled.

16. The device of claim 1, wherein:

a. the power supply includes a housing and the x-ray tube includes a shield, with both the housing and the shield being solid, non-flexible structures that are capable of being fastened together to form a single solid, non-flexible structure, and that are configured to be separated and rejoined without damage to the housing, the shield, or internal components in the housing or the shield;

b. the housing and the shield are maintained at ground voltage; and

c. the power supply is configured to provide a voltage differential of at least 9 kilovolts between a cathode in the x-ray tube and the housing and shield.

17. The device of claim 1, wherein the plug connectors are disposed at the end of the plug and the socket connectors are disposed at the bottom of the socket.

18. A coupling device on a power supply or an x-ray tube, the device comprising:

a. a plug extending from, or a socket extending in towards, the power supply or the x-ray tube;

b. the plug or the socket having a tapered surface and a continuously reduced diameter;

c. the tapered surface having a non-linear profile and configured to mate with a non-linear profile of a tapered surface of a socket or plug;

d. the plug, or material forming the socket, comprising elastic, electrically insulative material;

e. electrical connectors associated with the plug or the socket; and

f. the electrical connectors configured to allow electrical current to flow from the power supply to the tube when connected.

19. The device of claim 18, wherein:

a. the tapered surface has a stepped profile, comprising at least two steps, each step including an abrupt reduction in diameter;

b. the steps include longitudinal segments and radial segments;

c. the longitudinal segments having a smaller angle than the radial segments with respect to a centerline of the plug or socket; and

d. an angle between the radial segments and the centerline of the plug or socket minus an angle between the longitudinal segments and the centerline of the plug or socket is greater than 30 degrees.

20. A coupling device on a power supply or an x-ray tube, the device comprising:

a. a plug extending from, or a socket extending in towards, the power supply or the x-ray tube;

b. the plug or the socket having a tapered surface and a continuously reduced diameter;

c. an annular surface surrounding the plug at a base or the socket at a leading edge thereof;

d. the tapered surface, the annular surface, or both, having a non-linear cross-sectional profile and configured to mate with a non-linear cross-sectional profile of a socket or plug;

e. the plug, or material forming the socket, comprising elastic, electrically insulative material; and

f. electrical connectors associated with the plug or the socket, the electrical connectors configured to allow electrical current to flow from the power supply to the tube when connected.