JP2009117083A - X-ray tube device - Google Patents

Abstract

To provide an X-ray tube apparatus capable of ensuring insulation of a high voltage connector over a long period of time by improving heat dissipation characteristics.
An X-ray tube 30 that accommodates an anode electrode 35 and a cathode electrode 36 in a vacuum envelope, a housing 20 that houses the X-ray tube 30 and is filled with a coolant, and a housing 20 External end surfaces 41 and 51 exposed to the outside of the housing 30 on one end side, internal end surfaces 42 and 52 located inside the vacuum envelope 31 on the other end side, and side surfaces 43 and 53 in contact with the coolant. Column-shaped high-voltage insulating members 40 and 50, and high-voltage metal terminals provided inside the high-voltage insulating members 40 and 50, connected to the anode electrode 35 and the cathode electrode 36, and led to the external end surfaces 41 and 51 44, 54.
[Selection] Figure 1

Description

  The present invention relates to an X-ray tube apparatus that generates X-rays, and more particularly to an improvement in insulation at a connection portion with a high voltage connector.

  An X-ray tube apparatus used for medical diagnostic equipment or the like operates by being supplied with a high voltage from a high voltage generator via a high voltage cable. A high-voltage connector is provided at the tip of the high-voltage cable. The high-voltage connector is detachably attached to the high-voltage connector connection portion on the X-ray tube device side, and supplies a high voltage to the cathode or anode of the X-ray tube device. Yes.

For example, a high voltage connector of a type that is attached by applying pressure to a high voltage connector connection part of an X-ray tube device is known (see, for example, Patent Documents 1 and 2). The pressure removes the air layer between the electrically insulating rubber of the high voltage connector and the electrically insulating member of the high voltage connector connecting portion of the X-ray tube apparatus, and the surfaces of each of them are firmly attached. As a result, it is possible to cut off the discharge path along the adhesion interface. The merit of using such a high voltage connector is that the X-ray tube device is more compact than when insulating oil is used for high voltage insulation.
Japanese Patent Laid-Open No. 2002-216682 US Pat. No. 6,556,654

  The X-ray tube apparatus described above has the following problems. That is, in the combination of the high voltage connector and the high voltage connector connecting portion of the X-ray tube device, when the heat generation of the X-ray tube increases, the heat dissipation function of heat transmitted from the cathode or anode is limited. Then, the electrically insulating rubber member of the high voltage connector is deformed beyond the allowable temperature, and the close contact with the electrically insulating member of the high voltage connector connecting portion of the X-ray tube is lowered. As a result, there is a problem that the discharge along the adhesion interface between the high voltage connector and the high voltage connector connection portion of the X-ray tube apparatus occurs relatively early.

  Then, this invention aims at providing the X-ray tube apparatus which can ensure the insulation of a high voltage connector over a long period of time by improving a thermal radiation characteristic.

  In order to solve the problems and achieve the object, the X-ray tube apparatus of the present invention is configured as follows.

  An X-ray tube that houses an anode target and a cathode that emits electrons that irradiate the anode target in a vacuum envelope, a housing that houses the X-ray tube and is filled with a coolant, and A column-shaped height provided on the housing, having an external end surface exposed to the outside of the housing on one end side, an internal end surface located inside the vacuum envelope on the other end side, and a side surface in contact with the cooling liquid. A voltage insulating member, and a high voltage metal terminal provided inside the high voltage insulating member, connected to the anode target or the cathode, and led out to the external end face are provided.

  According to the present invention, it is possible to ensure insulation of the high voltage connector over a long period of time by improving the heat dissipation characteristics.

  FIG. 1 is a longitudinal sectional view showing an X-ray tube apparatus 10 and high-voltage connectors 100 and 200 according to the first embodiment of the present invention. The X-ray tube apparatus 10 is a neutral anode type fixed anode type. The X-ray tube apparatus 10 is a bottomed cylindrical housing 20 that contains a coolant, an X-ray tube 30 that is housed in the housing 20, and a high height for supporting the X-ray tube 30 from the housing 20. Voltage insulating members 40 and 50 are provided.

  The housing 20 is provided with a rubber bellows 21 to adjust the pressure of the coolant. A coolant circulation pump 22 that creates a coolant flow is provided outside the housing 20. Further, a heat exchanger 23 for releasing the heat of the cooling liquid to the outside is provided outside the housing 20. In FIG. 1, reference numeral 24 denotes an output window, and 25 and 26 denote annular support members that support the high voltage insulating members 40 and 50 in a liquid-tight manner with respect to the housing 20, respectively.

  The X-ray tube 30 is entirely composed of a vacuum envelope 31 made of a metal material. The vacuum envelope 31 includes a tubular portion 32, an upper flange portion 33 that forms the upper bottom of the tubular portion 32, and a lower flange portion 34 that forms the lower bottom. The upper flange portion 33 is provided with an anode electrode (anode target) 35, and the lower flange portion 34 is provided with a cathode electrode (cathode) 36. A recoil electron trap 37 having the same potential as the anode electrode 35 is disposed at the center of the vacuum envelope 31.

  The cylindrical portion 32 is provided with an output window 32a, and the recoil electron trap 37 is provided with an output window 37a. When a high voltage is applied between the anode electrode 35 and the cathode electrode 36, the electron beam emitted from the cathode electrode 36 collides with the X-ray emission layer 350 of the anode electrode 35. The X-ray emitting layer 350 emits X-rays by the collision of the electron beam, and X-rays are output from the output windows 32a and 37a. A part of the electron beam colliding with the X-ray emission layer 350 is reflected with almost no energy loss. Since the reflected electrons (recoil electrons) are captured by the recoil electron trap 37, they do not collide with the surfaces of the X-ray emission layer 350, the high voltage insulating members 40 and 50, and the vacuum envelope 31. Thereby, it is possible to prevent the focus of the X-ray tube 30 from being blurred and to charge up the high voltage insulating members 40 and 50.

  The high voltage insulating member 40 is formed in a columnar shape, and has an outer end face 41 exposed to the outside of the housing 20 on the upper end side, an inner end face 42 located inside the vacuum envelope 31 on the lower end side, and a coolant. It has a side surface 43 in contact therewith. Inside the high voltage insulating member 40, a high voltage metal terminal 44 connected to the anode electrode 35 and led out to the external end face 41 side is provided. The high voltage metal terminal 44 is supported by the KOV member 45 which is a low expansion alloy with respect to the high voltage insulating member 40.

  The high voltage insulating member 50 is formed in a columnar shape, and has an outer end surface 51 exposed to the outside of the housing 20 on the lower end side, an inner end surface 52 located inside the vacuum envelope 31 on the upper end side, and a coolant. It has a side surface 53 in contact therewith. Inside the high voltage insulating member 50 is provided with a high voltage metal terminal 54 connected to the cathode electrode 36 and led out to the external end face 51 side. The high voltage metal terminal 54 is supported by a KOV member 55 which is a low expansion alloy with respect to the high voltage insulating member 50.

  The high voltage insulating members 40 and 50 are preferably made of ceramics such as aluminum nitride or beryllia because of their high thermal conductivity. Further, alumina, silicon nitride, or the like may be used as ceramics.

  The high voltage connector 100 includes a bottomed cylindrical housing 101, an anode high voltage cable 102 having a tip inserted into the housing 101, and a terminal 102a at the tip of the anode high voltage cable 102 filled in the housing 101. Made of an epoxy resin material, which is fixed toward the opening side of the housing 101, and a silicone resin material inserted between the fixing portion 103 and the external end face 41 of the high-voltage insulating member 40 described above. And a silicone plate 104.

  The high voltage connector 200 includes a bottomed cylindrical housing 201, a cathode high voltage cable 202 having a tip inserted into the housing 201, and a terminal 202a at the tip of the cathode high voltage cable 202 filled in the housing 201. The fixing portion 203 made of an epoxy resin material that fixes the housing 201 toward the opening side of the housing 201, and the silicone resin material inserted between the fixing portion 203 and the external end face 51 of the high-voltage insulating member 50 described above. And a rubber part 204.

  The X-ray tube apparatus 10 and the high voltage connectors 100 and 200 configured as described above are used as follows. When the high voltage connectors 100 and 200 are attached to the housing 20, the silicone plates 104 and 204 are pressed so as to be in close contact with the fixing portions 103 and 203 and the external end surfaces 41 and 51 of the high voltage insulating members 40 and 50, respectively.

  Next, when a predetermined high voltage is applied to the high voltage connectors 100 and 200, an electron beam is emitted from the cathode electrode 36 to the X-ray emission layer 350 on the surface of the anode electrode 35, and an X-ray is output from the X-ray emission layer 350. Irradiated to the outside from the windows 32a and 37a.

  As the X-ray irradiation continues, the temperature of the anode electrode 35 and the cathode electrode 36 increases. The heat of the anode electrode 35 and the cathode electrode 36 is transmitted to the high voltage insulating members 40 and 50 through the high voltage metal terminals 44 and 54. Since the side surfaces 43 and 53 of the high voltage insulating members 40 and 50 are in contact with the coolant, they are cooled. That is, the heat of the anode electrode 35 and the cathode electrode 36 is dissipated into the cooling liquid, the temperature of the high voltage connectors 100 and 200 can be lowered, and insulation can be ensured over a long period. The coolant is circulated by the coolant circulation pump 22, and heat is released to the outside by the heat exchanger 23. In the case where an aqueous coolant is used as the coolant, the high voltage insulating members 40 and 50 can be efficiently cooled because the heat transfer coefficient is the highest. Since the heat transfer rate is high, the entire cooling liquid has a more uniform temperature.

  In addition, since the water-based coolant has a large specific heat (about twice that of the insulation oil) compared to the case where the insulation oil is used, the temperature rise of the coolant due to the heat radiation of the X-ray tube 30 can be kept low. A temperature sensor is generally attached to the outer surface of the housing 20, and the X-ray apparatus on which the X-ray tube apparatus 10 is mounted is for the safety of the operator when the measured value of the temperature sensor exceeds 75 ° C. An interlock that prohibits X-ray exposure is performed so that the temperature of the X-ray tube apparatus 10 does not rise any further. The temperature sensor is mounted on the outer surface of the housing 20 where the temperature is highest. If this interlock works frequently during use, it will interfere with diagnosis and is not preferable. Therefore, when the coolant is an aqueous coolant, the interlock does not work unless the X-ray tube device is used for a longer time than when the coolant is an insulating oil, which is preferable for diagnosis.

  As described above, according to the X-ray tube device 10 of the present invention, it is possible to ensure the insulation of the high-voltage connector over a long period of time by improving the heat dissipation characteristics.

  FIG. 2 is a longitudinal sectional view showing an X-ray tube apparatus 300 and a high voltage connector 200 according to the second embodiment of the present invention. 2, the same functional parts as those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the X-ray tube apparatus 300, the high voltage insulating member 50 is used only for the cathode electrode 36. Further, the anode electrode 35 is connected to the outside by a cable 38, and its periphery is waterproofed by a rubber material 39.

In the case of the grounded anode type X-ray tube apparatus, the same effects as those of the X-ray tube apparatus 10 described above can be obtained even with such a configuration.

  FIG. 3 is a longitudinal sectional view showing an X-ray tube apparatus 300A and a high voltage connector 200 according to the third embodiment of the present invention. 3, the same functional parts as those in FIG. 2 are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the X-ray tube apparatus 300 </ b> A, the high voltage insulating member 50 is used only for the anode electrode 35. In the case of a cathode-grounded X-ray tube apparatus, the same effects as those of the X-ray tube apparatus 300 described above can be obtained even with such a configuration.

  FIG. 4 is a longitudinal sectional view showing an X-ray tube apparatus 400 and a high voltage connector 200 according to the fourth embodiment of the present invention. 4, the same functional parts as those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the X-ray tube device 400, a high voltage insulating member 450 is provided instead of the high voltage insulating member 50. The high voltage insulating member 450 is separated into an inner piece 451 and an outer piece 452. A concave portion 451a is provided on the upper surface of the inner piece 451 in the figure, and only the outer edge portion 451b is brazed to the outer piece 452. With such a configuration, the heat generated at the cathode electrode 36 passes through the outer peripheral side of the high-voltage insulating member 450, so that the cooling effect by the coolant can be further increased. Therefore, even with such a configuration, the same effect as that of the X-ray tube apparatus 10 described above can be obtained.

  FIG. 5 is a longitudinal sectional view showing an X-ray tube apparatus 400A and a high voltage connector 200 according to the fifth embodiment of the present invention. 5, the same functional parts as those in FIG. 4 are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the X-ray tube apparatus 400 </ b> A, a high voltage insulating member 440 is provided instead of the high voltage insulating member 40. The high voltage insulating member 440 is separated into an inner piece 441 and an outer piece 442. A concave portion 441 a is provided on the upper surface of the inner piece 441 in the figure, and only the outer edge portion 441 b is brazed to the outer piece 442. With this configuration, the heat generated in the anode electrode 35 passes through the outer peripheral side of the high-voltage insulating member 440, so that the cooling effect by the coolant can be further increased. Therefore, even with such a configuration, the same effect as that of the X-ray tube apparatus 400 described above can be obtained.

  FIG. 6 is a longitudinal sectional view showing an X-ray tube apparatus 500 and a high voltage connector 200A according to a sixth embodiment of the present invention. 6, the same functional parts as those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the X-ray tube apparatus 500, a high voltage insulating member 550 is provided instead of the high voltage insulating member 50. The high-voltage insulating member 550 has an outer end surface 551 formed in a convex shape and an inner end surface 552 formed in a concave shape. The high voltage connector 200 </ b> A includes a fixing portion 203 </ b> A in which a lower surface in the drawing is formed in a concave shape and the outer end surface 551 is fitted instead of the fixing portion 203. The fixing portion 203A is made of a soft material such as a silicone rubber material or ethylene propylene rubber (EP rubber), and is in close contact with the high voltage insulating member 550.

  If formed in this way, the same effects as those of the X-ray tube apparatus 10 described above can be obtained, and the number of parts can be reduced because it is not necessary to use the silicone plate 204.

  FIG. 7 is a longitudinal sectional view showing an X-ray tube apparatus 500A and a high voltage connector 100A according to a seventh embodiment of the present invention. 7, the same functional parts as those in FIG. 5 are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the X-ray tube apparatus 500 </ b> A, a high voltage insulating member 540 is provided instead of the high voltage insulating member 40. The high-voltage insulating member 540 has an outer end surface 541 formed in a convex shape and an inner end surface 542 formed in a concave shape. The high voltage connector 100 </ b> A includes a fixing portion 103 </ b> A in which a lower surface in the drawing is formed in a concave shape and the outer end surface 551 is fitted instead of the fixing portion 103. The fixing portion 103A is made of a soft material such as a silicone rubber material or ethylene propylene rubber (EP rubber), and is in close contact with the high voltage insulating member 540. If formed in this way, the same effect as the X-ray tube apparatus 500 described above can be obtained.

  FIG. 8 is a longitudinal sectional view showing an X-ray tube apparatus 600 and a high voltage connector 200B according to an eighth embodiment of the present invention. 8, the same functional parts as those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the X-ray tube apparatus 600, a high voltage insulating member 650 is provided instead of the high voltage insulating member 50. The high-voltage insulating member 650 has an outer end surface 651 formed in a concave shape and an inner end surface 652 formed in a convex shape. The high voltage connector 200 </ b> B includes a fixing portion 203 </ b> B in which a lower surface in the drawing is formed in a convex shape and the outer end surface 651 is fitted instead of the fixing portion 203. The fixing portion 203B is made of a soft material such as a silicone rubber material or ethylene propylene rubber (EP rubber), and is in close contact with the high voltage insulating member 650.

  If formed in this way, the same effects as those of the X-ray tube apparatus 10 described above can be obtained, and the number of parts can be reduced because it is not necessary to use the silicone plate 204.

  FIG. 9 is a longitudinal sectional view showing an X-ray tube apparatus 600A and a high voltage connector 100B according to a ninth embodiment of the present invention. 9, the same functional parts as those in FIG. 7 are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the X-ray tube apparatus 600 </ b> A, a high voltage insulating member 640 is provided instead of the high voltage insulating member 40. The high voltage insulating member 640 has an outer end surface 641 formed in a concave shape and an inner end surface 642 formed in a convex shape. The high voltage connector 100 </ b> B includes a fixing portion 103 </ b> B in which a lower surface in the drawing is formed in a convex shape and the outer end surface 651 is fitted instead of the fixing portion 103. The fixing portion 103B is made of a soft material such as a silicone rubber material or ethylene propylene rubber (EP rubber), and is in close contact with the high voltage insulating member 640. If formed in this way, the same effect as the X-ray tube apparatus 600 described above can be obtained.

  FIG. 10 is a longitudinal sectional view showing an X-ray tube apparatus 700 and a high voltage connector 200 according to the tenth embodiment of the present invention. 10, the same functional parts as those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the X-ray tube apparatus 700, a high voltage insulating member 750 is provided instead of the high voltage insulating member 50. In the high-voltage insulating member 750, the distance between the outer end surface 751 and the inner end surface 752 is set to be larger on the outer diameter side and smaller on the inner diameter side. With this configuration, the heat generated at the cathode electrode 36 passes through the outer peripheral side of the high-voltage insulating member 750, so that the cooling effect by the coolant can be further increased. Therefore, even with such a configuration, the same effect as that of the X-ray tube apparatus 10 described above can be obtained.

  FIG. 11 is a longitudinal sectional view showing an X-ray tube apparatus 700A and a high voltage connector 200 according to an eleventh embodiment of the present invention. 11, the same reference numerals are given to the same functional portions as those in FIG. 10, and detailed description thereof will be omitted.

  In the X-ray tube apparatus 700 </ b> A, a high voltage insulating member 740 is provided instead of the high voltage insulating member 40. In the high-voltage insulating member 740, the distance between the outer end surface 741 and the inner end surface 742 is set to be large on the outer diameter side and small on the inner diameter side. With this configuration, the heat generated in the anode electrode 35 passes through the outer peripheral side of the high-voltage insulating member 740, so that the cooling effect by the coolant can be further increased. Therefore, even with such a configuration, the same effect as that of the X-ray tube apparatus 700 described above can be obtained.

  FIG. 12 is a longitudinal sectional view showing an X-ray tube apparatus 800 and a high voltage connector 200 according to a twelfth embodiment of the present invention. 12, the same functional parts as those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the X-ray tube device 800, a bottomed cylindrical high voltage insulating member 850 is provided instead of the high voltage insulating member 50. The high voltage insulating member 850 is configured such that the distance between the outer end surface 851 and the inner end surface 852 is set larger on the outer diameter side and smaller on the inner diameter side, and constitutes a part of the vacuum envelope. With this configuration, the heat generated by the cathode electrode 36 passes through the outer peripheral side of the high-voltage insulating member 850 having a wide cooling surface, so that the cooling effect by the coolant can be further increased. Further, the withstand voltage can be increased by increasing the thickness of the high voltage insulating member 850. Therefore, even with such a configuration, the same effect as that of the X-ray tube apparatus 10 described above can be obtained.

  FIG. 13 is a longitudinal sectional view showing an X-ray tube apparatus 800A and a high voltage connector 200 according to a thirteenth embodiment of the present invention. 13, the same functional parts as those in FIG. 12 are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the X-ray tube apparatus 800A, a high voltage insulating member 740 is provided instead of the high voltage insulating member 40. The high voltage insulating member 740 is configured such that the distance between the outer end surface 741 and the inner end surface 742 is set larger on the outer diameter side and smaller on the inner diameter side, and constitutes a part of the vacuum envelope. Even in such a configuration, the same effect as that of the X-ray tube apparatus 800 described above can be obtained.

  FIG. 14 is a longitudinal sectional view showing an X-ray tube apparatus 900 according to the fourteenth embodiment of the present invention. The X-ray tube apparatus 900 is a rotary anode type in which an anode target rotates in a vacuum inside a vacuum envelope. 14, the same functional parts as those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

  In FIG. 14, 910 indicates a stator coil, 920 indicates a rotor, 930 indicates a bearing, and 940 indicates an anode electrode.

  In the X-ray tube apparatus 900 configured as described above, by applying a predetermined current to the stator coil 910, the rotor 920 rotates and the anode electrode 940 rotates. Next, when a predetermined high voltage is applied to the high voltage connectors 100 and 200, an electron beam is emitted from the cathode electrode 36 to the X-ray emission layer 950 on the surface of the anode electrode 940, and X-rays are output from the X-ray emission layer 950. Irradiated to the outside from the windows 32a and 37a.

  As the X-ray irradiation continues, the temperature of the anode electrode 940 and the cathode electrode 36 increases. The heat of the anode electrode 940 and the cathode electrode 36 is transferred to the high voltage insulating members 40 and 50 through the high voltage metal terminals 44 and 54. Since the side surfaces 43 and 53 of the high-voltage insulating members 40 and 50 are in contact with the coolant, they are cooled. That is, the heat of the anode electrode 940 and the cathode electrode 36 is dissipated into the cooling liquid, the temperature of the high voltage connectors 100 and 200 can be lowered, and insulation can be ensured over a long period of time.

1 is a longitudinal sectional view showing an electron tube device and a high voltage connector according to a first embodiment of the present invention. The longitudinal cross-sectional view which shows the electron tube apparatus and high voltage connector which concern on the 2nd Embodiment of this invention. The longitudinal cross-sectional view which shows the electron tube apparatus and high voltage connector which concern on the 3rd Embodiment of this invention. The longitudinal cross-sectional view which shows the electron tube apparatus and high voltage connector which concern on the 4th Embodiment of this invention. The longitudinal cross-sectional view which shows the electron tube apparatus and high voltage connector which concern on the 5th Embodiment of this invention. The longitudinal cross-sectional view which shows the electron tube apparatus and high voltage connector which concern on the 6th Embodiment of this invention. The longitudinal cross-sectional view which shows the electron tube apparatus and high voltage connector which concern on the 7th Embodiment of this invention. The longitudinal cross-sectional view which shows the electron tube apparatus and high voltage connector which concern on the 8th Embodiment of this invention. The longitudinal cross-sectional view which shows the electron tube apparatus and high voltage connector which concern on the 9th Embodiment of this invention. The longitudinal cross-sectional view which shows the electron tube apparatus and high voltage connector which concern on the 10th Embodiment of this invention. The longitudinal cross-sectional view which shows the electron tube apparatus and high voltage connector which concern on the 11th Embodiment of this invention. The longitudinal cross-sectional view which shows the electron tube apparatus and high voltage connector which concern on the 12th Embodiment of this invention. The longitudinal cross-sectional view which shows the electron tube apparatus and high voltage connector which concern on the 13th Embodiment of this invention. The longitudinal cross-sectional view which shows the electron tube apparatus and high voltage connector which concern on the 14th Embodiment of this invention.

Explanation of symbols

  10, 300, 300A, 400, 400A, 500, 500A, 600, 600A, 700, 700A, 800, 800A, 900 ... electron tube device, 20 ... housing, 30 ... X-ray tube, 35 ... anode electrode, 36 ... cathode electrode , 40, 50, 440, 450, 540, 550, 640, 650, 740, 750, 840, 850... High voltage insulating member, 44, 54.

Claims (8)

An X-ray tube that houses an anode target and a cathode that emits electrons that irradiate the anode target in a vacuum envelope;
A housing that houses the X-ray tube and is filled with a coolant;
A columnar shape having an outer end surface exposed to the outside of the housing on one end side, an inner end surface located inside the vacuum envelope on the other end side, and a side surface in contact with the cooling liquid. A high voltage insulating member;
An X-ray tube apparatus comprising: a high voltage metal terminal provided inside the high voltage insulating member, connected to the anode target or the cathode, and led out to the external end face.   The X-ray tube apparatus according to claim 1, wherein the coolant is an aqueous coolant.   3. The X of claim 1, wherein an external end surface of the high voltage insulating member is formed in a flat shape, and a rubber portion of a high voltage connector used for connection with the high voltage metal terminal is closely attached. Tube device.   The external end face of the high voltage insulating member is formed in a convex shape with respect to the outside, and a rubber part of a high voltage connector used for connection with the high voltage metal terminal is closely attached. 2. The X-ray tube apparatus according to 2.   3. The outer end face of the high voltage insulating member is formed in a concave shape with respect to the outside, and a rubber portion of a high voltage connector used for connection with the high voltage metal terminal is closely attached. The X-ray tube apparatus described.   6. The X-ray tube apparatus according to claim 1, wherein the high voltage insulating member is formed integrally with the vacuum envelope.   The X-ray tube apparatus according to claim 1, further comprising a coolant circulation pump that creates a flow of the coolant in the housing.   The X-ray tube apparatus according to claim 7, further comprising a heat exchanger that releases the heat of the cooling liquid to the outside.

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