JP6783543B2 - Rotating anode type X-ray tube device - Google Patents

Description

An embodiment of the present invention relates to a rotating anode type X-ray tube device.

Conventionally, an X-ray tube device has been used as an X-ray source in medical equipment and industrial equipment that image a subject with X-rays. Further, as an X-ray tube device, a rotating anode type X-ray tube device is known.

The rotating anode type X-ray tube device includes an X-ray tube that emits X-rays, a stator coil, and a housing that houses the X-ray tube and the stator coil. The X-ray tube includes a fixed shaft, a cathode that generates electrons, a rotating body, an anode target provided on the rotating body, and a vacuum enclosure. The rotating body is rotatably supported by a bearing with respect to a fixed shaft, and rotates by receiving a magnetic field generated from a stator coil. X-rays are emitted when the electrons emitted from the cathode collide with the rotating anode target.

Both ends of the fixed shaft are usually supported by support portions provided on two opposing surfaces of the vacuum enclosure. In such a structure, the vacuum enclosure needs to be strong so that it will not be damaged by the load from the fixed shaft.

By making the vacuum enclosure made of metal, the strength of the vacuum enclosure can be increased. However, in this case, the electromagnetic field of the stator coil causes a loss due to the induced current in the vacuum enclosure, which causes unnecessary heat generation and reduces the rotational efficiency of the rotating body. In particular, when the rotating body is to be rotated at high speed, the loss becomes extremely large, and it becomes difficult to maintain the performance of the X-ray tube device.

Japanese Unexamined Patent Publication No. 2005-78918 Japanese Unexamined Patent Publication No. 2004-171868 Japanese Unexamined Patent Publication No. 2011-60517

An object of one aspect of the present disclosure is to suitably support a fixed shaft in a rotating anode type X-ray tube device.

The rotating anode type X-ray tube device according to one embodiment includes a vacuum enclosure, a fixed shaft, a rotating body, an anode target, and a support. The fixed shaft includes a first end portion supported by the vacuum enclosure, a second end portion opposite to the first end portion, a first portion housed in the vacuum enclosure, and the above. It extends out of the vacuum enclosure and has a second portion that includes the second end. The rotating body is housed in the vacuum enclosure and is rotatably supported by the first portion of the fixed shaft. The anode target is provided on the rotating body. The support is provided outside the vacuum enclosure and supports the second portion so that the fixed shaft can move in the axial direction. Further, the thickness of the portion supporting the first end portion of the vacuum enclosure is larger than the thickness of the portion supporting the boundary between the first portion and the second portion of the vacuum enclosure.

FIG. 1 is a cross-sectional view schematically showing an X-ray tube device according to the first embodiment. FIG. 2 is a schematic perspective view of the support according to the first embodiment. FIG. 3 is a schematic cross-sectional view of the support and the fixed shaft according to the first embodiment. FIG. 4 is a schematic cross-sectional view of the X-ray tube device according to the second embodiment. FIG. 5 is a schematic perspective view of the support according to the second embodiment. FIG. 6 is a schematic cross-sectional view of the support according to the second embodiment. FIG. 7 is an exploded perspective view of the support according to the third embodiment. FIG. 8 is an exploded perspective view of the support according to the third embodiment as viewed from another direction. FIG. 9 is a perspective view showing an example of mounting the support according to the third embodiment. FIG. 10 is a schematic cross-sectional view of the support according to the third embodiment.

Some embodiments will be described with reference to the drawings. In each embodiment, a rotating anode type X-ray tube device in which the anode rotates and an anode grounded type X-ray tube device in which the anode is grounded are disclosed. However, the structure disclosed in each embodiment may be appropriately applied to other types of X-ray tube devices such as the neutral point grounding type.

(First Embodiment)
FIG. 1 is a cross-sectional view schematically showing an X-ray tube device TD according to the first embodiment.
As shown in this figure, the X-ray tube device TD includes an X-ray tube 1, a stator 2 (stator coil), and a housing 3. The housing 3 houses the X-ray tube 1 and the stator 2.

The X-ray tube 1 includes a fixed shaft 10, a rotating body 20, an anode target 30, and a vacuum enclosure 40. A part of the fixed shaft 10, the rotating body 20, and the anode target 30 are housed in the vacuum enclosure 40. The vacuum enclosure 40 is sealed and the inside is maintained in a vacuum state.

In the following description, the direction along the axis A1 of the fixed shaft 10 (horizontal direction in the figure) is referred to as the first direction X, and the direction perpendicular to the first direction X (vertical direction in the figure) is the second direction. Call it Y. Further, the direction perpendicularly intersecting both the first direction X and the second direction Y is referred to as the third direction Z. That is, FIG. 1 corresponds to an XY cross-sectional view of the X-ray tube device TD.

The fixed shaft 10 has a first end portion E1 and a second end portion E2 in the first direction X. Further, the fixed shaft 10 has a first portion 11 housed in the vacuum enclosure 40 and a second portion 12 extending to the outside of the vacuum enclosure 40. In the example of FIG. 1, the fixed shaft 10 has a hollow structure that is open to both the first end portion E1 and the second end portion E2. A cooling liquid is flowed inside the fixed shaft 10, whereby the X-ray tube 1 is cooled.

The rotating body 20 is rotatably supported by bearings around the first portion 11 of the fixed shaft 10. The rotating body 20 includes a first cylinder 21, a second cylinder 22, and a third cylinder 23. The first cylinder 21, the second cylinder 22, and the third cylinder 23 are provided coaxially with the axis A1 (rotational axis) of the fixed shaft 10. For example, the fixed shaft 10, the first cylinder 21, the second cylinder 22, the third cylinder 23, and the anode target 5 all have a shape in which the cross sections in all directions along the axis A1 are point-symmetrical with respect to the axis A1.

The small gap formed between the first portion 11 of the fixed shaft 10 and the first cylinder 21 is filled with the lubricant LM. That is, the rotating body 20 includes a first radial bearing surface corresponding to the outer peripheral surface of the first portion 11, a second radial bearing surface corresponding to the inner peripheral surface of the first cylinder 21, and a lubricant LM. It is rotatably supported with respect to the first portion 11 by a pressure bearing. As the lubricant LM, for example, a liquid metal can be used.

The second cylinder 22 is connected to the first cylinder 21 and extends in the direction of the first end portion E1 with a gap between the second cylinder 22 and the outer peripheral surface of the first cylinder 21. The anode target 30 is formed in an annular shape and is connected to the second cylinder 22. The anode target 30 is provided coaxially with the fixed shaft 10 and the like, and rotates integrally with the rotating body 20. The anode target 30 may be formed integrally with the second cylinder 22. Further, the anode target 30 may be formed integrally with the first cylinder 21 without passing through the second cylinder 22.

The anode target 30 is made of a metal material such as a heavy metal. As an example, a molybdenum alloy can be used as the metal material of the anode target 30. Further, the anode target 30 has an annular X-ray radiation layer 31 on the surface (the surface on the right side in the drawing) on the side of the first end portion E1. The X-ray radiation zone 31 needs to be made of a metal material having a high melting point in order to withstand high temperatures. As the metal material of the X-ray radiation zone 31, for example, a tungsten alloy can be used.

The third cylinder 23 is connected to the first cylinder 21 at a position closer to the second portion 12 of the fixed shaft 10 than the anode target 30, and extends in the direction of the second end E2. The third cylinder 23 plays the role of a rotor constituting the motor M together with the stator 2, and copper can be used as the material thereof, for example. The third cylinder 23 faces the stator 2 via the vacuum enclosure 40. The stator 2 is provided so as to surround the outside of the vacuum enclosure 40 in an annular shape.

The stator 2 generates a magnetic field applied to the third cylinder 23. When the third cylinder 23 receives this magnetic field, the rotating body 20 rotates about the axis A1 together with the anode target 30. A relatively negative voltage is applied to the cathode (not shown) arranged to face the X-ray radiation layer 31, a relatively positive voltage is applied to the anode target 30, and a potential difference is generated between the cathode and the anode target 30. Occurs. Electrons are emitted from the filament provided by the cathode, and these electrons are accelerated toward the anode target 30 and collide with the X-ray radiation layer 31. As a result, the X-rays generated from the X-ray radiation layer 31 pass through the vacuum enclosure 40 and further pass through the X-ray radiation window provided in the housing 3 and are emitted to the outside of the X-ray tube device TD. To. The cathode is arranged inside, for example, the vacuum enclosure 40.

The housing 3 has a first housing 3a and a second housing 3b. The first housing 3a and the second housing 3b are connected to each other by appropriate means such as screwing. The first housing 3a and the second housing 3b are formed of, for example, an aluminum alloy casting. Further, an X-ray shielding layer containing lead or a lead alloy as a main component is formed inside the first housing 3a and the second housing 3b. When the above-mentioned coolant is water, a rust preventive layer that covers the X-ray shield layer may be further formed in order to prevent corrosion of the X-ray shield layer and the like.

In the vacuum enclosure 40, at least a portion located between the stator 2 and the third cylinder 23 is formed of an insulating member 41 such as glass or ceramic material, and the other portion is formed of a metal material. In the example of FIG. 1, the vacuum enclosure 40 is fixed to the housing 3 in a state where the protruding portion corresponding to the anode target 30 is in contact with the second housing 3b.

The fixed shaft 10 is airtightly connected to the vacuum enclosure 40 in the vicinity of the first end E1. Further, the fixed shaft 10 is also airtightly connected to the vacuum enclosure 40 at the boundary between the first portion 11 and the second portion 12. In such a configuration, the fixed shaft 10 is supported by the vacuum enclosure 40 near the first end E1 and at the boundary between the first portion 11 and the second portion 12.

In the vacuum enclosure 40, the portion that supports the vicinity of the first end portion E1 is formed of a metal material continuously from the portion that contacts the second housing 3b. Therefore, the fixed shaft 10 is stably supported in the vicinity of the first end portion E1. On the other hand, a non-metal insulating member 41 is interposed between the portion supporting the boundary between the first portion 11 and the second portion 12 and the portion in contact with the second housing 3b. Therefore, it is difficult to stably support the fixed shaft 10 on the side of the second end portion E2.

Therefore, in the present embodiment, the support 50 is provided inside the housing 3, and the support 50 supports the vicinity of the second end portion E2 of the fixed shaft 10. Hereinafter, the support 50 will be described with reference to FIGS. 2 and 3 in addition to FIG. FIG. 2 is a schematic perspective view of the support 50. FIG. 3 is a schematic cross-sectional view of a part of the support 50 and the fixed shaft 10 along the YZ plane.

As shown in FIGS. 1 and 2, the support 50 is a plate-shaped member elongated in the second direction Y. As the material of the support 50, a metal material having excellent rust prevention properties such as stainless steel can be used.

As shown in FIG. 1, the lower end of the support 50 is fixed to the second housing 3b. For this fixing, an appropriate method such as screwing can be used. A support surface 51 is formed at the upper end of the support 50.

In the present embodiment, the support surface 51 is a curved surface recessed in a semicircular shape. This curved surface has a radius of curvature equal to or greater than the radius of the outer peripheral surface of the second portion 12 of the fixed shaft 10. As shown in FIG. 3, a second portion 12 of the fixed shaft 10 is placed on the support surface 51. As a result, the support surface 51 and the fixed shaft 10 come into contact with each other, and the fixed shaft 10 is supported by the support 50.

The fixed shaft 10 is not fixed to the support 50. Therefore, the fixed shaft 10 can move in the direction of the shaft A1 (the direction parallel to the first direction X) while being supported by the support surface 51.

In the present embodiment described above, in the fixed shaft 10, the first end portion E1 is supported by the vacuum enclosure 40, and the second end portion E2 is supported by the support body 50. As a result, the fixed shaft 10 can be stably supported by the so-called double-sided structure.

Further, in the vacuum enclosure 40, a portion located between the stator 2 and the second cylinder 22 (rotor) is formed by an insulating member 41 made of a non-metal material. This prevents the generation of an induced current due to the magnetic field generated by the stator 2. As a result, unnecessary heat generation when driving the motor M can be suppressed, and the rotation efficiency of the rotating body 20 can be improved. Further, in the present embodiment, since the fixed shaft 10 is supported by the support 50, a large load is not applied to the insulating member 41. Therefore, it is possible to prevent the vacuum enclosure 40 from being damaged.

The fixed shaft 10 thermally expands due to heat generated when the X-ray tube device TD is used, and contracts as the temperature drops when it is not used thereafter. In such expansion and contraction, the fixed shaft 10 is largely deformed mainly in the direction of the shaft A1. In the present embodiment, the support 50 movably supports the fixed shaft 10 in the direction of the shaft A1. Therefore, the fixed shaft 10 can be deformed by sliding the support surface 51. As a result, the generation of stress due to the expansion and contraction of the fixed shaft 10 is suppressed, and the reliability of the X-ray tube device TD is improved.

In the example of FIG. 1, the thickness of the vacuum enclosure 40 that supports the vicinity of the first end E1 of the fixed shaft 10 is the vacuum enclosure that supports the boundary between the first portion 11 and the second portion 12. Greater than 40 thickness. Therefore, the vacuum enclosure 40 firmly supports the fixed shaft 10 in the vicinity of the first end portion E1 with almost no deformation even when subjected to stress due to expansion and contraction of the fixed shaft 10, but the first portion 11 At the boundary between the second portion 12 and the second portion 12, the fixed shaft 10 is easily deformed with expansion and contraction. As a result, the stress generated in the fixed shaft 10 and the vacuum enclosure 40 can be relaxed.

The X-ray tube device TD according to the present embodiment can be used as an X-ray source of, for example, an X-ray CT (Computed Tomography) device. In this case, the X-ray tube device TD is attached to the gantry of the X-ray CT device so as to rotate in the YZ plane. The center of rotation of the gantry is located above the X-ray tube device TD in FIG. When the gantry is driven, a centrifugal force is generated toward the bottom surface of the second housing 3b to which the vacuum enclosure 40 and the support 50 are attached as the X-ray tube device TD rotates. According to the configuration of the present embodiment, the centrifugal force applied to the X-ray tube 1 at this time can be stably received by the vacuum enclosure 40 and the support 50.
In addition to the above, various suitable effects can be obtained from the present embodiment.

(Second Embodiment)
The second embodiment will be described. This embodiment is different from the first embodiment in the configuration of the support 50. The same elements as those in the first embodiment are designated by the same reference numerals, and duplicate description will be omitted.

FIG. 4 is a schematic cross-sectional view of the X-ray tube device TD according to the second embodiment along the XY plane. Further, FIG. 5 is a schematic perspective view of the support 50, and FIG. 6 is a schematic cross-sectional view of a part of the support 50 and the fixed shaft 10 along the YZ plane.

As shown in each figure, the support 50 in the present embodiment includes a first member 52, a second member 53, and a pair of male screws 54. As the material of the first member 52, the second member 53, and each male screw 54, a metal material having excellent rust prevention properties such as stainless steel can be used.

As shown in FIGS. 5 and 6, the first member 52 has a pair of legs 52a and 52b and a bridge 52c connecting the upper ends of the legs 52a and 52b. Further, the first member 52 has a pair of through holes 52d provided in the bridge 52c. For example, each through hole 52d is a through hole without a female screw and extends in the second direction Y. The legs 52a, 52b and the bridge 52c may be integrally formed or may be separately formed and connected to each other. As shown in FIG. 4, the lower ends of the legs 52a and 52b are fixed to the second housing 3b. For this fixing, an appropriate method such as screwing can be used.

As shown in FIGS. 5 and 6, the second member 53 is arranged in a space surrounded by the legs 52a and 52b and the bridge 52c. Both side surfaces of the second member 53 are in contact with the legs 52a and 52b, respectively. The second member 53 has a pair of female threads 53a provided at positions corresponding to the through holes 52d. In the example of FIG. 6, each female screw 53a extends in the second direction Y and penetrates from the upper surface to the lower surface of the second member 53. However, each female screw 53a does not have to penetrate the second member 53.

Further, the second member 53 has a support surface 51 on the upper surface facing the bridge 52c. For example, the support surface 51 is a curved surface recessed in a semicircular shape as in the first embodiment, and has a radius of curvature equal to or greater than the radius of the outer peripheral surface of the second portion 12 of the fixed shaft 10. As shown in FIG. 4, the support surface 51 is also rounded in cross-sectional shape along the XY plane with a predetermined curvature. That is, the support surface 51 has a shape corresponding to a part of the annular surface (torus surface).

Each male screw 54 is passed through each through hole 52d from the upper surface of the bridge 52c. Further, each male screw 54 is screwed into each female screw 53a. As a result, the first member 52 and the second member 53 are fixed to each other. An elastic body may be interposed between the head of each male screw 54 and the upper surface of the bridge 52c in order to prevent overtightening of each male screw 54 and each female screw 53a. As the elastic body, for example, a coil spring or a disc spring through which each male screw 54 is passed can be used.

As shown in FIG. 6, a second portion 12 of the fixed shaft 10 is placed on the support surface 51 of the second member 53. At this time, the support surface 51 faces the bridge 52c via the second portion 12. The support surface 51 comes into contact with the second portion 12, whereby the fixed shaft 10 is supported by the support 50. Further, the fixed shaft 10 can move in the direction of the shaft A1 (the direction parallel to the first direction X) while being supported by the support surface 51. Further, in the present embodiment, since the support surface 51 has a shape corresponding to a part of the torus surface, the fixed shaft 10 and the support surface 51 slide smoothly.

Since a waterproof layer and an X-ray shielding layer are formed on the inner surface of the second housing 3b, in the configuration of the first embodiment, the first end portion E1 supported by the vacuum enclosure 40 of the fixed shaft 10 It may be difficult to accurately match the height with the height of the support surface 51 that supports the second end E2. Further, in order to accurately match these heights, it is necessary to extremely improve the accuracy of the housing 3 and the vacuum enclosure 40. On the other hand, in the configuration of the present embodiment, the height of the support surface 51 can be adjusted by adjusting the amount of each male screw 54 screwed into each female screw 53a, so that the fixed shaft 10 can be easily and accurately supported. It becomes. Further, by adjusting the height of the support surface 51, the fixed shaft 10 can be appropriately pressurized.
In addition, the same effect as that of the first embodiment can be obtained from the present embodiment.

(Third Embodiment)
The third embodiment will be described. This embodiment is different from each of the above-described embodiments in the configuration of the support 50. Elements that are the same as or similar to each of the above embodiments are designated by the same reference numerals, and duplicate description will be omitted.

FIG. 7 is an exploded perspective view showing the support 50 according to the third embodiment, and FIG. 8 is an exploded perspective view of the support 50 viewed from an angle different from that of FIG. 7. The support 50 shown in each figure includes a first member 52, a second member 53, and a pair of male screws 54, similarly to the support 50 disclosed in the second embodiment. Further, the support 50 includes a pair of male screws 55.

The first member 52 has a pair of legs 52a and 52b and a bridge 52c connecting the legs 52a and 52b. The bridge 52c has a pair of through holes 52d as in the second embodiment. Further, the bridge 52c has a pair of through holes 52e extending in the first direction X. The through hole 52e is, for example, a through hole without a female screw and has a long shape in the second direction Y. The bridge 52c forms a space S in which the second member 53 is fitted between the through holes 52e. In the example of FIG. 7, an arcuate concave portion RS is provided on the lower surface of the bridge 52c facing the space S.

Each leg portion 52a and 52b has a through hole 52f, respectively. The through hole 52f is a through hole without a female screw and extends in the second direction Y.

The second member 53 has a support surface 51 and a pair of female threads 53a. The support surface 51 has a shape corresponding to a part of the torus surface as in the second embodiment. Further, the second member 53 has a pair of female threads 53b.

As shown in FIG. 8, the first member 52 has a pair of first planes F1. Each through hole 52e is provided in each of the first planes F1. Further, as shown in FIG. 7, the second member 53 has a pair of second planes F2. Each female screw 53b is provided on each of the second planes F2. The first plane F1 and the second plane F2 are planes that intersect perpendicularly with the first direction X (axial direction) and are parallel to the YZ plane. However, the first plane F1 and the second plane F2 may intersect the first direction X at an angle other than perpendicular.

FIG. 9 is a perspective view showing an example of mounting the support 50 to the second housing 3b and the fixed shaft 10. FIG. 10 is a cross-sectional view of the support 50, the second housing 3b, and the fixed shaft 10 shown in FIG. 9 along the YZ plane.

In the present embodiment, the second housing 3b has a pair of pedestals 60 protruding from the inner surface. Each pedestal 60 has a female screw 61 on the upper surface in the second direction Y. One male screw of the stud bolt 62 is screwed into each female screw 61. Further, the stud bolt 62 is passed through the through hole of the first plate 63, the through hole 52f of the legs 52a and 52b, the through hole of the second plate 64, and the washer 65 in this order. A nut 66 is tightened to the other male screw of the stud bolt 62. In this way, the first member 52 is fixed to the second housing 3b.

When attaching the second member 53 to the first member 52, each male screw 55 is screwed into the female screw 53b through the through hole 52e in a state where the first plane F1 and the second plane F2 are in contact with each other. Further, each male screw 54 is screwed into the female screw 53a through the through hole 52d. Since each through hole 52e is long in the second direction Y, even after each male screw 55 is screwed into each female screw 53b, the position of the second member 53 can be changed by changing the amount of each male screw 54 screwed into each female screw 53a. Can be fine-tuned in the second direction Y.

In the examples of FIGS. 9 and 10, the first member 52 is attached to the second housing 3b so that the first plane F1 faces the direction of the vacuum enclosure 40, and the second plane F2 faces the opposite direction. The second member 53 is attached to the first member 52 so as to face it.

In the second portion 12 of the fixed shaft 10, the lower outer peripheral surface in the second direction Y comes into contact with the support surface 51. Further, in the example of FIG. 10, the male screw 54 is fully screwed into the female screw 53a. In this state, the recess RS of the bridge 52c comes into contact with the upper outer peripheral surface of the second portion 12 in the second direction Y. However, when the amount of the male screw 54 screwed into the female screw 53a is reduced, a gap is formed between the outer peripheral surface of the second portion 12 and the recess RS. Since the load of the fixed shaft 10 (or the centrifugal force described above) is directed to the support surface 51, the fixed shaft 10 can be supported without any trouble even in a state where such a gap is generated.

Even with the configuration of the present embodiment described above, since the height of the support surface 51 can be adjusted as in the second embodiment, the fixed shaft 10 can be supported with high accuracy. Further, by adjusting the height of the support surface 51, the fixed shaft 10 can be appropriately pressurized.

Further, since the first plane F1 and the second plane F2 are in contact with each other and the male screw 55 and the female screw 53b are connected, the first member 52 and the second member 53 are less likely to be displaced in the first direction X. For example, when the first plane F1 faces the direction of the vacuum enclosure 40 as in the present embodiment, the load applied to the second member 53 in the direction away from the vacuum enclosure 40 is applied to the first plane. It can be more preferably received by F1. When the load in the opposite direction becomes a problem, the first plane F1 may be oriented in the opposite direction of the vacuum enclosure 40.

In addition, the same effects as those of the above-described embodiments can be obtained from this embodiment.

Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are also included in the scope of the invention described in the claims and the equivalent scope thereof.

TD ... X-ray tube device, A1 ... shaft, LM ... lubricant, M ... motor, 1 ... X-ray tube, 2 ... stator, 3 ... housing, 5 ... anode target, 10 ... fixed shaft, 11 ... fixed shaft 1st part, 12 ... 2nd part of fixed shaft, 20 ... rotating body, 21 ... 1st cylinder, 22 ... 2nd cylinder, 23 ... 3rd cylinder, 30 ... anode target, 31 ... X-ray radiation layer, 40 ... Vacuum enclosure, 41 ... insulating member, 50 ... support, 51 ... support surface, 52 ... first member, 53 ... second member.

Claims (7)

With a vacuum enclosure,
The first end supported by the vacuum enclosure, the second end opposite to the first end, the first portion housed in the vacuum enclosure, and the vacuum enclosure. A fixed shaft that extends outward and has a second portion that includes the second end.
A rotating body housed in the vacuum enclosure and rotatably supported by the first portion of the fixed shaft.
An anode target provided on the rotating body and
A support provided outside the vacuum enclosure and supporting the second portion so that the fixed shaft can move in the axial direction.
Equipped with a,
A rotary anode type in which the thickness of the portion supporting the first end portion of the vacuum enclosure is larger than the thickness of the portion supporting the boundary between the first portion and the second portion of the vacuum enclosure. X-ray tube device. A motor further comprising a rotor provided on the rotating body at a position closer to the second portion of the fixed shaft than the anode target, and a stator facing the rotor via the vacuum enclosure.
The rotary anode type X-ray tube device according to claim 1. The vacuum enclosure has at least a portion located between the rotor and the stator made of a non-metallic material and other portions made of a metallic material.
The rotary anode type X-ray tube apparatus according to claim 2. Further comprising a housing for accommodating the vacuum enclosure, the fixed shaft, the rotating body, the anode target, and the support.
The support is fixed to the housing and has a support surface that contacts the outer peripheral surface of the second portion of the fixed shaft.
The rotary anode type X-ray tube device according to any one of claims 1 to 3. With a vacuum enclosure,
The first end supported by the vacuum enclosure, the second end opposite to the first end, the first portion housed in the vacuum enclosure, and the vacuum enclosure. A fixed shaft that extends outward and has a second portion that includes the second end.
A rotating body housed in the vacuum enclosure and rotatably supported by the first portion of the fixed shaft.
An anode target provided on the rotating body and
A support provided outside the vacuum enclosure and supporting the second portion so that the fixed shaft can move in the axial direction.
Said vacuum envelope, said fixed shaft, said rotary body, said anode target, and provided with a housing for accommodating the said support,
The support
A first member that is fixed to the housing and has a through hole,
A support surface facing the first member via the second portion of the fixed shaft, and a second member having a female screw.
A male screw screwed into the female screw through the through hole,
With
The second portion of the fixed shaft is in contact with the support surface, rotating anode X-ray tube apparatus. The first member has a first plane that intersects the axial direction.
The second member has a second plane in contact with the first plane.
The rotary anode type X-ray tube apparatus according to claim 5. With a vacuum enclosure,
The first end supported by the vacuum enclosure, the second end opposite to the first end, the first portion housed in the vacuum enclosure, and the vacuum enclosure. A fixed shaft that extends outward and has a second portion that includes the second end.
A rotating body housed in the vacuum enclosure and rotatably supported by the first portion of the fixed shaft.
An anode target provided on the rotating body and
A support provided outside the vacuum enclosure and supporting the second portion so that the fixed shaft can move in the axial direction.
The vacuum enclosure, the fixed shaft, the rotating body, the anode target, and a housing for accommodating the support are provided.
The support is fixed to the housing and has a support surface that contacts the outer peripheral surface of the second portion of the fixed shaft.
The support surface is recessed in a semicircular arc with a radius or radii of curvature of the outer peripheral surface of the second portion of the fixed shaft, the rotating anode X-ray tube apparatus.

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