Rotating-anode X-ray tube assembly and rotating-anode X-ray tube apparatus

1. A rotating-anode X-ray tube assembly comprising:

an X-ray tube comprising an anode target including a target layer which emits X-rays, an anode target rotating mechanism configured to rotatably support the anode target, a cathode disposed opposite to the target layer in a direction along an axis of the anode target and configured to emit electrons, and an envelope accommodating the anode target, the anode target rotating mechanism and the cathode;

a stator coil configured to generate a driving force for rotating the anode target rotating mechanism;

a housing comprising an X-ray radiation port opening in a direction perpendicular to the axis, and storing and holding the X-ray tube and the stator coil;

an X-ray radiation window configured to close the X-ray radiation port and to take out the X-rays to an outside of the housing; and

a coolant filled in a space between the X-ray tube and the housing and absorbing at least part of heat produced by the X-ray tube,

wherein the housing includes a first divisional part which includes the X-ray radiation port and to which the X-ray tube is directly or indirectly fixed, and a second divisional part located on a side opposite to the anode target with respect to the anode target rotating mechanism and coupled to the first divisional part, and

a coupling surface between the first divisional part and the second divisional part is located on one plane, and is inclined to the axis, with exclusion of a direction perpendicular to the axis.

2. The rotating-anode X-ray tube assembly of claim 1 , further comprising an X-ray shielding member disposed along at least a part of an inner surface of the first divisional part.

3. The rotating-anode X-ray tube assembly of claim 2 , wherein the X-ray shielding member is stuck to at least a part of the inner surface of the first divisional part.

4. The rotating-anode X-ray tube assembly of claim 2 , wherein the X-ray shielding member is formed of a material containing lead or a lead alloy as a main component.

5. The rotating-anode X-ray tube assembly of claim 2 , wherein the first divisional part and the X-ray shielding member extend in the direction along the axis toward the second divisional part side beyond an extension line of a surface of the target layer.

6. The rotating-anode X-ray tube assembly of claim 1 , wherein the coupling surface is inclined in an upper-right direction, in an attitude in which the axis is parallel to a horizontal line, the X-ray radiation window is located on an upper side of the anode target and the cathode is located on a right side of the anode target.

7. The rotating-anode X-ray tube assembly of claim 1 , wherein the stator coil is directly or indirectly fixed to the first divisional part.

8. The rotating-anode X-ray tube assembly of claim 1 , wherein the anode target is grounded, and a negative high voltage is applied to the cathode.

9. The rotating-anode X-ray tube assembly of claim 1 , wherein the first divisional part includes a through-hole extending in the direction along the axis, and

the X-ray tube includes a high-voltage connection part which extends in the direction along the axis, passes through the through-hole, and is exposed to an outside of the housing.

10. A rotating-anode X-ray tube apparatus comprising:

an X-ray tube comprising an anode target including a target layer which emits X-rays, an anode target rotating mechanism configured to rotatably support the anode target, a cathode disposed opposite to the target layer in a direction along an axis of the anode target and configured to emit electrons, and an envelope accommodating the anode target, the anode target rotating mechanism and the cathode;

a stator coil configured to generate a driving force for rotating the anode target rotating mechanism;

a housing comprising an X-ray radiation port opening in a direction perpendicular to the axis, and storing and holding the X-ray tube and the stator coil;

an X-ray radiation window configured to close the X-ray radiation port and to take out the X-rays to an outside of the housing;

a coolant filled in a space between the X-ray tube and the housing and absorbing at least part of heat produced by the X-ray tube;

a conduit communicating with the housing and forming, together with the housing, a passage of the coolant; and

a cooler unit attached to the conduit and comprising a circulating pump configured to circulate the coolant and a radiator configured to radiate heat of the coolant,

wherein the housing includes a first divisional part which includes the X-ray radiation port and to which the X-ray tube is directly or indirectly fixed, and a second divisional part located on a side opposite to the anode target with respect to the anode target rotating mechanism and coupled to the first divisional part, and

a coupling surface between the first divisional part and the second divisional part is located on one plane, and is inclined to the axis, with exclusion of a direction perpendicular to the axis.

11. The rotating-anode X-ray tube apparatus of claim 10 , wherein the cooler unit further comprises a fan unit configured to produce a flow of air in a vicinity of the radiator.

12. A rotating-anode X-ray tube apparatus comprising:

an X-ray tube comprising an anode target including a target layer which emits X-rays, an anode target rotating mechanism configured to rotatably support the anode target, a cathode disposed opposite to the target layer in a direction along an axis of the anode target and configured to emit electrons, and an envelope accommodating the anode target, the anode target rotating mechanism and the cathode;

a stator coil configured to generate a driving force for rotating the anode target rotating mechanism;

a housing including an X-ray radiation port opening in a direction perpendicular to the axis, and storing and holding the X-ray tube and the stator coil;

an X-ray radiation window configured to close the X-ray radiation port and to take out the X-rays to an outside of the housing;

a coolant filled in a space between the X-ray tube and the housing and absorbing at least part of heat produced by the X-ray tube;

a conduit;

another coolant; and

a cooler unit,

wherein the housing includes a first divisional part which includes the X-ray radiation port and to which the X-ray tube is directly or indirectly fixed, and a second divisional part located on a side opposite to the anode target with respect to the anode target rotating mechanism and coupled to the first divisional part,

a coupling surface between the first divisional part and the second divisional part is located on one plane, and is inclined to the axis, with exclusion of a direction perpendicular to the axis,

the X-ray tube comprises a cooling passage configured to radiate at least part of heat produced,

the conduit communicates with the cooling passage of the X-ray tube through the housing,

the another coolant is filled in the cooling passage and the conduit, and absorbs at least part of heat produced by the X-ray tube, and

the cooler unit is attached to the conduit and comprises a circulating pump configured to circulate the another coolant and a radiator configured to radiate heat of the another coolant.

13. The rotating-anode X-ray tube apparatus of claim 12 , wherein the cooler unit further comprises a fan unit configured to produce a flow of air in a vicinity of the radiator.