JP2006085995A - Rotary anode type x-ray tube - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary anode type X-ray tube in which temperature rise can be suppressed and rocking at rotation can be prevented. <P>SOLUTION: A first rotation member 6 and a second rotation member 11 are combined at the far side from the rotary anode 2. The second rotation member 11 and a third rotation member 21 are combined at the near side to the rotary anode 2. The heat accumulated in the rotary anode 2 is conducted from the near side to the rotary anode 2 of the first rotation member 6 to the far side from the rotary anode 2 of the second rotation member 11, and then conducted to the near side to the rotary anode 2 of the third rotation member 21. Thereby, the conduction route from the rotary anode 2 to the third rotation member 21 becomes longer. Temperature rise at the radial bearing face 54 between the third rotation member 21 and a fixed body 51 can be suppressed and the area of the radial bearing face 54 can be made large. The centroid of the rotating mechanism 8 can be located at the near side to the rotary anode 2. Rocking of the rotary anode 2 at the time of rotation can be prevented. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a rotary anode type X-ray tube in which an anode target rotates.

  Conventionally, this type of rotating anode X-ray tube has a rotating body partially fixed with an anode target, and the rotating body is rotatably fitted and held by the fixed body. A liquid metal lubricated sliding bearing is provided between the rotating body and the fixed body. This rotating body is configured by coaxially fitting a second rotating member provided with a slide bearing on a first rotating member to which an anode target is coupled. And the folding structure where these 1st rotation members and 2nd rotation members are couple | bonded in the direction far from the anode target in the heat conduction path | route seeing to an axial direction is known (for example, refer patent document 1). ).

  The rotary anode X-ray tube has a simple structure, but the temperature suppression of the sliding bearing of the rotating body is not so good.

  Therefore, a rotary anode X-ray tube, which is an improved version of this rotary anode X-ray tube, is provided with a disk-shaped rotary anode having a coaxial double folded structure and a target layer for emitting X-rays. The first rotating member is fixed to the disk-shaped rotating anode. A cylindrical second rotating member is provided surrounding the first rotating member, and the second rotating member is coupled to the first rotating member on the side of the first rotating member far from the disc-shaped rotating anode. ing.

  Further, a cylindrical third rotating member in which the second rotating member is located on one inner side is coupled to the second rotating member on the side of the second rotating member close to the disc-shaped rotating anode. Furthermore, a cylindrical fourth rotating member located inside the other side of the third rotating member is partially coupled to the third rotating member. A fixed body is fitted inside the fourth rotating member, and a hydrodynamic slide bearing is provided between the fixed body and the fourth rotating member.

That is, this improved version of the rotary anode X-ray tube suppresses the temperature rise of the liquid metal lubricated sliding bearing by taking a longer heat conduction path from the anode target than the folded anode X-ray tube. In addition, a configuration is known in which the thermal expansion of the first rotating member is offset by the thermal expansion of the second rotating member, and the focal shift on the anode side is reduced (see, for example, Patent Document 2).
Japanese Unexamined Patent Publication No. 5-13030 (page 2-4, FIG. 1) JP 2001-357806 A (page 2-4, FIG. 1)

  However, in the rotary anode X-ray tube corresponding to the above-described improved version, the rotary anode X-ray tube before the improvement of the rotary anode X-ray tube is improved by the folded structure of the first rotary member and the second rotary member. The rotating body is positioned on the side far from the anode target.

  Further, since the contact area between the fourth rotating member and the fixed body is smaller than that of the rotating anode X-ray tube before the improvement, the area of the hydrodynamic slide bearing between the fourth rotating member and the fixed body is small. It will decrease. Therefore, there is a possibility that buoyancy to the rotating body that normally operates the dynamic pressure type sliding bearing between the fourth rotating member and the fixed body may not be obtained.

  For this reason, it is not easy to efficiently suppress the temperature rise in the dynamic pressure type sliding bearing, and the anode target may be shaken during rotation due to the small bearing area in the dynamic pressure type sliding bearing. have.

  The present invention has been made in view of these points, and an object of the present invention is to provide a rotary anode type X-ray tube capable of efficiently suppressing a temperature rise and preventing rotational shaking.

  The present invention includes an anode target, a first rotating member to which the anode target is attached, and the first rotating member in contact with the first rotating member on a side opposite to the side where the anode target is located. A substantially cylindrical second rotating member that is attached and covers the first rotating member with a gap between the second rotating member and the second rotating member on the side where the anode target is located. A substantially cylindrical third rotating member mounted in contact with the member and covering the second rotating member with a gap between the third rotating member and the second rotating member; A substantially cylindrical fixed body that is rotatably fitted between the third rotating member and provided with a bearing surface between the third rotating member and the third rotating member.

  Then, the second rotating member having a substantially cylindrical shape comes into contact with and is attached to the opposite side of the first rotating member on which the anode target is attached to the side where the anode target is located. The rotating member is covered with a gap. Further, a substantially cylindrical third rotating member is attached in contact with the second rotating member on the side where the anode target is located, and the second rotating member is interposed through the gap by the third rotating member. Covered. As a result, due to the temperature rise accompanying the rotation of the anode target, the heat stored in the anode target is conducted from the opposite side of the first rotating member to the side where the anode target is located to the second rotating member. Further, the heat conducted to the second rotating member is conducted from the side of the second rotating member where the anode target is located to the third rotating member. Therefore, since the heat conduction path from the anode target becomes long, the temperature rise of the anode target is efficiently suppressed. A substantially cylindrical fixed body is rotatably fitted between the third rotating member and the second rotating member, and a bearing surface is provided between the fixed body and the third rotating member. Therefore, the area of the bearing surface can be further increased, so that the swing of the anode target during the rotation of the third rotating member relative to the fixed body can be prevented.

  According to the present invention, heat stored in the anode target is conducted from the opposite side of the first rotating member to the side where the anode target is located to the second rotating member, and is conducted to the second rotating member. The conducted heat is conducted from the side where the anode target of the second rotating member is located to the third rotating member, so that the heat conduction path from the anode target becomes longer, and therefore the temperature rise of the anode target is reduced. Since the area of the bearing surface provided between the fixed body and the third rotating member can be increased more efficiently, the swing of the anode target during rotation of the third rotating member relative to the fixed body can be increased. Can be prevented.

  Hereinafter, the configuration of an embodiment of a rotary anode X-ray tube of the present invention will be described with reference to the drawings.

  1 to 3, reference numeral 1 denotes a rotary anode X-ray tube. The rotary anode X-ray tube 1 is an X-ray tube having a coaxial double folded structure. The rotary anode X-ray tube 1 includes a disc-shaped rotary anode 2 that is an anode target as a rotary anode structure. A part of the rotating anode 2 is provided with a target layer 4 that emits X-rays when irradiated with an electron beam from an electron gun 3 as a cathode structure. The rotary anode 2 is coaxially fixed to and attached to one end in the longitudinal direction of the elongated cylindrical first rotary member 6 by a fixing nut 5.

  The first rotating member 6 is formed in a bottomed cylindrical shape that opens toward the other end along the longitudinal direction, which is the opposite side to the side where the rotating anode 2 is located. The first rotating member 6 is a fixed cylindrical shaft as a support shaft made of molybdenum. A circle extending outward in the radial direction is provided on the other end of the first rotating member 6 on the side far from the rotating anode 2 in the axial direction, that is, on the side opposite to the side where the rotating anode 2 is located. An annular flange 7 is mechanically connected by joining or the like and attached. The flange portion 7 is integrally connected to a rotation mechanism 8 as a bearing that rotatably supports the rotary anode 2. The rotating mechanism 8 is a sliding bearing structure using liquid metal lubrication that supports the rotating anode 2 rotatably in the circumferential direction via the first rotating member 6.

  Specifically, the rotation mechanism 8 includes a second rotating member 11 having a substantially cylindrical shape. The second rotary member 11 is mechanically connected and coupled to the flange 7 at the other end of the second rotary member 11 that is far from the rotary anode 2 in the axial direction, that is, the other side opposite to the side where the rotary anode 2 is located. The rotating member 6 is fixed and attached coaxially. Therefore, the second rotating member 11 and the second rotating member 11 are arranged in order to make the heat conduction path from the first rotating member 6 to the second rotating member 11 longer. Are mechanically connected to the outer peripheral surface of the first rotating member 6 via a flange portion 7 having a width dimension smaller than the length dimension of a predetermined gap A formed therebetween. At this time, the flange portion 7 and the second rotating member 11 are integrally configured, and an inner portion of the flange portion 7 is connected to the first rotating member 6 by brazing. Further, the outer peripheral surface of the first rotating member 6 and the inner peripheral surface of the second rotating member 11 are concentrically connected via a gap A.

  In addition, the second rotating member 11 surrounds the outer peripheral surface of the first rotating member 6 through the gap A from the coupling portion with the flange portion 7, toward the side where the rotating anode 2 is located. It is growing. That is, the second rotating member 11 concentrically covers the outer peripheral surface of the first rotating member 6 over the rotation axis direction of the first rotating member 6. Further, the second rotating member 11 covers from the one end edge of the first rotating member 6 to the position on the other end side. Further, the second rotating member 11 is formed with an interval A between the outer peripheral surface of the first rotating member 6 except for a portion of the flange portion 7 that is coupled to the first rotating member 6. The heat insulation layer is formed.

  Furthermore, an annular mounting piece 12 that protrudes outward in the radial direction along the circumferential direction is integrally provided at one end edge of the second rotating member 11. And between the other end surface of this attachment piece part 12 and the outer peripheral surface of the 2nd rotation member 11, the step-shaped latching step part 13 as a 1st small diameter part is provided along the circumferential direction. ing. Further, on the other end side of the outer peripheral edge of the mounting piece portion 12, a step shape as a second small diameter portion cut out along the circumferential direction on the outer peripheral surface side and the other end side of the second rotating member 11. Mounting step 14 is provided. The mounting step 14 is provided outside the outer peripheral surface of the locking step 13 and at one end side along the circumferential direction.

  A cylindrical third rotating member 21 is concentrically attached to the outside of the second rotating member 11. The second rotating member 11 and the third rotating member 21 are the sides of the second rotating member 11 and the third rotating member 21 that are close to the rotating anode 2 in the axial direction, that is, the side where the rotating anode 2 is located. The one end of each of the second rotating member 11 and the third rotating member 21 is mechanically connected by joining or the like and attached. Specifically, the third rotating member 21 is joined in a state where one end edge of the third rotating member 21 is engaged with the mounting step 14 of the second rotating member 11.

  At this time, one end side of the third rotating member 21 has a thickness dimension substantially equal to the height dimension along the radial direction of the mounting step portion 14 of the second rotating member 11. That is, one end portion of the third rotating member 21 is attached to the mounting step portion 14 of the second rotating member 11 and mechanically connected, and the mounting step portion 14 of the second rotating member 11 is connected. It is comprised so that it may become flush | level with the outer peripheral surface. Therefore, the third rotating member 21 and the second rotating member 11 are arranged in order to make the heat conduction path from the second rotating member 11 to the third rotating member 21 longer. And is mechanically connected to the mounting step 14 of the mounting piece 12 of the second rotating member 11 having a width smaller than the length of the predetermined gap B therebetween.

  The third rotating member 21 surrounds the outer peripheral surface of the second rotating member 11 through the gap B from the coupling portion with the second rotating member 11 so that the rotating anode 2 is positioned. It extends in the direction opposite to the side to be used. Therefore, the second rotating member 11 is coaxially positioned inside the third rotating member 21. Further, in the third rotating member 21, the other end side of the third rotating member 21 protrudes toward the other end side from the other end edge of the second rotating member 11.

  A narrow gap B is formed between the second rotating member 11 and the third rotating member 21 except for the connecting portion between the second rotating member 11 and the third rotating member 21. Thus, a bearing space is formed. Here, each of the flange portion 7, the second rotating member 11, and the third rotating member 21 is formed of an alloy having a low thermal conductivity, for example, an alloy of 50% by mass of iron and 50% by mass of nickel. ing.

  Further, locking protrusions 22 projecting outward along the radial direction are integrally provided along the circumferential direction at the opening outer edges of the one end side and the other end side of the third rotating member 21. ing. Here, these locking projections 22 have a thickness dimension substantially equal to the height dimension along the radial direction of the mounting step 14 of the second rotating member 11. Further, these locking projections 22 are formed in an annular shape along the circumferential direction of the third rotating member 21, and are formed flush with the one end surface and the other end surface of the third rotating member 21. Has been. A small diameter cylindrical portion 23 having a smaller diameter, which is a part lower than the locking projections 22, is formed on the outer peripheral surface of the third rotating member 21 positioned between the locking projections 22. Yes. Further, an opening 24 that is coaxially opened toward the central axis of the third rotating member 21 is provided inside the locking projection 22 located on the other end side of the third rotating member 21. It has been.

  A substantially cylindrical outer rotating member 31 as a heat radiation rotating member is provided concentrically with a predetermined gap C outside the third rotating member 21. The outer rotating member 31 is attached between the locking projections 22 on the outer peripheral surface of the third rotating member 21. In other words, the outer rotating member 31 is attached to the outer peripheral surface of the small diameter portion 23 located between the locking projections 22 of the third rotating member 21. Therefore, the outer rotating member 31 is formed in a cylindrical shape having a length dimension smaller than the distance between the locking projections 22 of the third rotating member 21, that is, the length dimension of the small diameter portion 23.

  The outer rotating member 31 has a heat radiation function for releasing the heat conducted from the third rotating member 21 and the like to the outside. That is, the outer rotating member 31 is made of a material such as copper having an excellent heat radiation function. Further, the outer rotating member 31 and the third rotating member 21 are mechanically connected and connected by joining or the like on one end side that is close to the rotating anode 2. Specifically, an annular coupling protrusion 32 as a connecting portion is integrally provided along the circumferential direction inside one end edge of the outer rotating member 31. The coupling protrusion 32 protrudes inward from the inner peripheral surface of the outer rotating member 31, and is equal to the width dimension of the gap C formed between the third rotating member 21 and the outer rotating member 31. Has a height dimension.

  Therefore, the outer rotating member 31 has a gap C between the third rotating member 21 and the outer rotating member 31 in order to make the heat conduction path from the third rotating member 21 to the outer rotating member 31 longer. It is mechanically connected to the third rotating member 21 by a coupling protrusion 32 having a width dimension smaller than the length dimension. The coupling protrusion 32 is coupled and mechanically connected to a position on the other end side through a predetermined gap D from the other end surface of the locking projection 22 on one end side of the third rotating member 21. It is attached. At this time, the other end side of the outer rotating member 31 is also accommodated on one end side through a predetermined gap E from one end face of the locking projection 22 on the other end side of the third rotating member 21.

  That is, a narrow gap C is formed between the third rotating member 21 and the outer rotating member 31 except for the connecting portion between the second rotating member 11 and the third rotating member 21. A heat insulating layer is formed. At this time, the outer rotating member 31 has the third rotating member 31 so that the outer peripheral surface of the outer rotating member 31 is flush with the outer peripheral surface of the locking projection 22 of the third rotating member 21. It is attached to the outside of 21. Further, the locking protrusion 22 at the other end of the third rotating member 21 has an outer diameter larger than the outer diameter of the outer peripheral surface of the third rotating member 21 other than the locking protrusion 22, that is, the small diameter portion 23. The dimensions are large.

  The opening 24 inside the locking projection 22 on the other end side is sealed with a substantially annular thrust ring 41. The thrust ring 41 covers and closes the opening 24 on the other end side while covering the other end surface of the locking projection 22 on the other end side of the third rotating member 21. Further, an opening 42 is provided at the center of the thrust ring 41. A fixed body that is a hollow stator with a narrow bearing gap F maintained in a gap B that is an internal space between the inner surface of the third rotating member 21 and the outer surface of the second rotating member 11. 51 is rotatably fitted and attached. Here, the bearing gap F is a space formed between the inner surface of the fixed body 51 and the outer peripheral surface of the second fixing member 11.

  The fixed body 51 includes a hollow cylindrical portion 52 having a bottomed cylindrical shape, which is a large-diameter portion whose other end is closed. The hollow cylinder portion 52 is rotatably and slidably fitted between the second rotating member 11 and the third rotating member 21, and is fitted to the locking step portion 13 of the second rotating member 11. It is rotatably and slidably locked. Further, a spiral groove 53 is provided on the outer peripheral surface of the hollow cylindrical portion 52 to form a radial bearing surface 54, thereby forming a dynamic pressure type slide bearing in the radial direction. Therefore, a hydrodynamic slide bearing is formed between the outer peripheral surface of the hollow cylindrical portion 52 and the inner peripheral surface of the third rotating member 21.

  Further, an anode support portion 55 as a small diameter portion having a smaller outer diameter than the hollow cylinder portion 52 is coaxially connected and fixedly attached to the other end side of the hollow cylinder portion 52. The anode support portion 55 extends through the opening 42 of the thrust ring 41 and projects to the outside of the thrust ring 41. Further, a spiral groove (not shown) is provided on each of the opening edge on the one end side and the other end surface of the hollow cylindrical portion 52 to form a thrust bearing surface, thereby forming a dynamic pressure type slide bearing in the thrust direction.

  The helical groove 53 and the bearing gap D are configured so as to be filled with a metal lubricant (not shown) during operation. Here, as the metal lubricant, an active liquid metal such as a liquid gallium (Ga) alloy is used as the liquid metal lubricant. Therefore, each of the third rotating member 21 and the fixed body 51 is made of a material having a relatively high hardness and hardly corroded by the metal lubricant, for example, a material such as SKD11 (JIS standard) of iron alloy tool steel. Yes.

  Here, each of the rotating anode 2, the first rotating member 6, and the rotating mechanism 8 is housed in a vacuum envelope 61 as a vacuum container together with an electron gun or the like and held in vacuum. In the non-vacuum region outside the vacuum envelope 61, an induction motor 62 as magnetic field forming means as drive means is installed and attached. The induction motor 62 is a stator coil that forms an induction magnetic field by applying a voltage to the induction motor 62 and rotationally drives the outer rotating member 31 using the induction magnetic field as a rotating magnetic field. Then, the outer rotating member 31 rotates the rotating anode 2 through the third rotating member 21, the second rotating member 11, and the first rotating member 6 by the rotation of the outer rotating member 31.

  Next, the operation of the rotary anode X-ray tube of the above embodiment will be described.

  First, a rotating magnetic field is induced by the induction motor 62, and this rotating magnetic field is applied to the outer rotating member 31, so that the outer rotating member 31 is rotationally driven.

  At this time, each of the third rotating member 21, the second rotating member 11, and the first rotating member 6 rotates with the rotation of the outer rotating member 31, and is fixed to the first rotating member 6. The rotating anode 2 is rotated.

  In this state, the target layer 4 of the rotating rotary anode 2 is irradiated with an electron beam from the electron gun 3 to emit X-rays from the target layer 4.

  At this time, a part of the energy generated when the electron beam 3 is irradiated onto the target layer 4 from the electron gun 3 is converted into X-rays. Will rise.

  Here, the heat energy stored in the target layer 4 is conducted to the first rotating member 6, the second rotating member 11, the third rotating member 21, and the outer rotating member 31 through the rotating anode 2. Thus, the outer rotating member 31 is discharged to the outside.

  Furthermore, the torque on the radial bearing surface 54 between the fixed body 51 and the third rotating member 21 by the rotation of the rotating mechanism 8 with respect to the fixed body 51 by the third rotating member 21 accompanying the rotation of the rotating anode 2. Due to the loss, the rotation mechanism 8 itself generates heat.

  The heat generated by the rotating mechanism 8 itself is also conducted from the third rotating member 21 to the outer rotating member 31, and is released from the outer rotating member 31 to the outside.

  As described above, according to the embodiment, the first rotating member 6 and the second rotating member 11 are coupled on the side far from the rotating anode 2, and the second side is close to the rotating anode 2. The rotating member 11 and the third rotating member 21 are coupled. Therefore, the heat stored in the rotating anode 2 due to the temperature rise generated in the target layer 4 of the rotating anode 2 as the rotating anode 2 rotates is the side farther from the side closer to the rotating anode 2 of the first rotating member 6. Then, it is conducted from the side far from the rotating anode 2 of the first rotating member 6 to the side farther from the rotating anode 2 of the second rotating member 11 through the flange portion 7.

  Further, the heat conducted to the side of the second rotary member 11 far from the rotary anode 2 is conducted from the far side of the second rotary member 11 to the near side of the rotary anode 2, and then the second rotary member 11. Conduction is conducted from the side of the second rotating member 11 close to the rotating anode 2 to the side of the third rotating member 21 close to the rotating anode 2 through the attachment piece 12. In this case, the second rotating member 11 is folded back from the first rotating member 6 toward the rotating anode 2, and the third rotating member 21 is folded back from the second rotating member 11 to the opposite side of the rotating anode 2. Therefore, the structure is simple and the heat transfer path as the heat transfer path from the rotating anode 2 to the third rotating member 21 becomes longer.

  For this reason, the temperature rise at the rotating anode 2 is efficiently suppressed, and the temperature rise of the third rotating member 21 is reduced, and the radial bearing surface 54 between the third rotating member 21 and the fixed body 51 is reduced. The temperature rise at can be suppressed. As a result, the temperature rise of the metal lubricant for the bearing filled in the radial bearing surface 54 is suppressed, so that even if an active liquid metal is used as the metal lubricant, the third rotating member 21 or the fixed member is fixed. Since the reaction with the body 51 is suppressed, stable bearing performance can be maintained for a long time.

  Further, the thermal expansion of the first rotating member 6 can be more efficiently offset by the thermal expansion by the second rotating member 11 and the third rotating member 21. Therefore, the amount of movement of the focal point of the rotary anode 2 toward the electron gun 3 due to the thermal expansion of the third rotary member 21 can be reduced, and the radial bearing between the third rotary member 21 and the fixed body 51 can be reduced. The change in the gap on the surface 54 can be reduced.

  In addition, a cylindrical hollow tube portion 52 of the fixed body 51 is rotatably fitted in a bearing space between the second rotating member 11 and the third rotating member 21, and an outer peripheral surface of the hollow tube portion 52. A radial bearing surface 54 is formed between the first rotary member 21 and the inner peripheral surface of the third rotating member 21. As a result, the radial bearing surface between the third rotating member 21 and the hollow cylindrical portion 52 of the fixed body 51 extends over the entire bearing space between the second rotating member 11 and the third rotating member 21. The area of 54 can be increased.

  For this reason, by increasing the area of the radial bearing surface 54, the center of gravity of the rotating mechanism 8 can be positioned closer to the rotating anode 2, and a buoyancy to the rotating mechanism 8 that can be normally operated as a bearing is obtained. be able to. Therefore, the rotating anode 2 can be prevented from shaking during the rotation of the third rotating member 21 with respect to the fixed body 51, so that the rotation of the rotating anode 2 can be stabilized. That is, the stable rotation performance of the slide bearing can be maintained for a long time, and the amount of extension of the rotary anode 2 toward the electron gun 3 can be reduced, so that the amount of movement of the focal point can be reduced.

  In the above embodiment, the first rotating member 6 may be integrally formed with the rotating anode 2, and the rotating anode 2 and the first rotating member 6 may have any shape. Furthermore, in order to position the center of gravity of the rotating mechanism 8 closer to the rotating anode 2 side, the outer peripheral surface of the first rotating member 6 can be made as much as possible by the second rotating member 11 and the third rotating member 21 of the rotating mechanism 2. Although it is configured to cover widely, the area of the first rotating member 6 covered by the second rotating member 11 and the third rotating member 21 is changed as necessary, and the center of gravity position of the rotating mechanism 8 and the The length of the heat transfer path of the rotating mechanism 8 may be changed.

It is explanatory sectional drawing which shows one Embodiment of the rotating anode type | mold X-ray tube of this invention. It is explanatory sectional drawing which shows a part of rotary anode type X-ray tube same as the above. It is aa sectional drawing in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rotating anode type X-ray tube 2 Rotating anode as an anode target 6 1st rotating member
11 Second rotating member
21 Third rotating member
31 Outer rotating member
51 Fixed body
54 Radial bearing surface as bearing surface A, B clearance

Claims (4)

An anode target;
A first rotating member to which the anode target is attached;
A substantially cylindrical shape which is attached in contact with the first rotating member on the opposite side of the first rotating member to the side where the anode target is located, and which covers the first rotating member with a gap therebetween. A second rotating member of
The second rotating member is attached in contact with the second rotating member on the side where the anode target is located, and is provided in a substantially cylindrical third shape provided to cover the second rotating member with a gap. A rotating member of
A substantially cylindrical fixed body that is rotatably fitted between the third rotating member and the second rotating member and has a bearing surface provided between the third rotating member and the third rotating member; Rotating anode X-ray tube characterized by the above. The rotary anode type X-ray tube according to claim 1, wherein the first rotary member is formed in a substantially cylindrical shape opening toward a side opposite to a side where the anode target is located. The rotating anode according to claim 1 or 2, wherein the second rotating member and the third rotating member cover the first rotating member over the rotation axis direction of the first rotating member. Type X-ray tube. The rotary anode X-ray tube according to any one of claims 1 to 3, further comprising a substantially cylindrical outer rotary member provided outside the third rotary member and having a heat radiation function.

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