JPWO2018216408A1 - X-ray fluoroscopic equipment - Google Patents

Abstract

The X-ray fluoroscopic apparatus (100) includes guide surfaces (31a, 32a, 231a, 232a) that contact a guide member (40) that guides the rotation of the top plate (1), and is provided below the top plate. And at least one holding member (20, 220) and a plurality of anti-sway members (50, 253, 254) that hold the holding member in the longitudinal direction of the top plate and suppress horizontal shake operations other than rotation of the top plate And comprising.

Description

  The present invention relates to an X-ray fluoroscopic apparatus.

  2. Description of the Related Art Conventionally, an X-ray fluoroscopic apparatus capable of rotating a top plate with respect to an operation axis along the longitudinal direction of the top plate is known. Such a fluoroscopic imaging apparatus is disclosed in, for example, Japanese Patent Application Laid-Open No. 2006-051403.

  Japanese Patent Laid-Open No. 2006-051403 discloses a rectangular top plate on which a subject is placed, and roll operation of the top plate (rotation of the top plate with respect to an operation axis along the longitudinal direction of the top plate). Thus, there is disclosed an X-ray fluoroscopic apparatus including a top plate mechanism that supports the top plate, and an X-ray device including an X-ray tube device and an X-ray image receiving device. The X-ray fluoroscopic apparatus disclosed in Japanese Patent Application Laid-Open No. 2006-051403 is configured such that the top plate can be rotated by a desired angle with respect to the operation axis along the longitudinal direction of the top plate by the top plate mechanism. Has been.

JP 2006-051403 A

  In an X-ray fluoroscopic apparatus such as Japanese Patent Application Laid-Open No. 2006-051403, the top plate mechanism is disposed in the vicinity of one end in the longitudinal direction of the top plate. For this reason, it is preferable that a guide mechanism for guiding the rotation of the top plate is provided in order to stably rotate the entire rectangular top plate. As such a guide mechanism, a mechanism in which a guide member in contact with only the surface for guiding the top plate is provided so as not to interfere with the guide of the top plate. However, such a guide mechanism allows a swinging operation other than rotation between the guide member and the top plate because the guide member is not in contact with a surface other than the surface that guides the top plate. Therefore, when the top plate is fixed at a predetermined rotation position by the top plate mechanism, rattling (shake) other than the rotation direction may occur. For this reason, it is considered that there is a problem that the positional accuracy of the subject placed on the top plate is lowered.

  The present invention has been made to solve the above-described problems, and one object of the present invention has a configuration for guiding the rotation of the top plate with respect to the operation axis along the longitudinal direction of the top plate. To provide an X-ray fluoroscopic apparatus capable of suppressing a decrease in positional accuracy of a subject placed on a top plate due to suppression of rattling in the case. It is.

  In order to achieve the above object, an X-ray fluoroscopic apparatus according to one aspect of the present invention provides a top plate on which a subject is placed, X-rays that irradiate the subject with X-rays and pass through the subject. An imaging unit that detects and performs X-ray fluoroscopy or X-ray imaging, a drive source, and a drive transmission member, and rotates the top plate with respect to an operation axis along the top plate longitudinal direction, which is the longitudinal direction of the top plate. A drive mechanism capable of moving the relative position between the top plate and the imaging unit, and a drive mechanism provided separately from the drive mechanism, including a guide member for guiding the rotation of the top plate, and a guide surface in contact with the guide member. At least one holding member provided below the plate is in contact with each of the one side surface and the other side surface in the top plate longitudinal direction of the single holding member with the holding member sandwiched in the top plate longitudinal direction. So that at least one piece is provided, other than the rotation of the top plate And a horizontal direction a plurality of shake operation to suppress the bracing member.

  As described above, an X-ray fluoroscopic apparatus according to one aspect of the present invention includes a guide surface that contacts a guide member that guides rotation of the top plate, and includes at least one holding member provided below the top plate; And at least one each of the one holding surface in the top plate longitudinal direction of the single holding member and the other side surface so as to sandwich and hold the holding member in the top plate longitudinal direction. And a plurality of anti-sway members that suppress horizontal movements other than rotation. As a result, the guide member guides the rotation of the top plate while being in contact with the guide surface of the holding member, and other than the rotation of the top plate while being in contact with the steadying member so that the holding member is sandwiched in the longitudinal direction of the top plate Can be suppressed. As a result, in the case of having a configuration for guiding the rotation of the top plate with respect to the operation axis along the longitudinal direction of the top plate, the top plate is placed on the top plate due to suppressing the backlash from occurring on the top plate. It can suppress that the positional accuracy of a subject falls. In addition, by providing a steady member on each of the one side surface and the other side surface in the longitudinal direction of the top plate of the single holding member, compared with the case where the steady member is provided on each of the plurality of holding members. Thus, the positioning of the plurality of steadying members can be performed on the basis of only a single holding member. As a result, even when the rotation position of the top plate is changed, the steadying member can easily maintain the state in which the holding member is sandwiched and contacted in the longitudinal direction of the top plate. Can be easily suppressed.

  In the X-ray fluoroscopic apparatus according to the above aspect, preferably, the guide member guides the rotation of the top plate by rotating in contact with the guide surface of the holding member when the top plate rotates. Includes rotating body. If comprised in this way, when a top plate rotates, the frictional resistance of the guide member and holding member in a guide surface can be reduced. As a result, it is possible to efficiently guide the rotation of the top plate with respect to the operation axis along the longitudinal direction of the top plate.

  In the X-ray fluoroscopic apparatus according to the above aspect, preferably, the holding member includes a first holding member and a second holding member that are spaced apart from each other in the longitudinal direction of the top plate, and the plurality of steadying members are the first Only one of the holding member and the second holding member is sandwiched and provided so as to contact. If comprised in this way, since rotation of a top plate can be guided in the several position distant in the top plate longitudinal direction, compared with the case where rotation of a top plate is guided only with one holding member. The rotation of the top plate can be stably guided. As a result, while the rotation of the top plate is stably guided, even when the rotation position of the top plate is changed, the steadying member easily holds the holding member in the longitudinal direction of the top plate and is in contact with it. be able to.

  In the configuration in which the holding member includes the first holding member and the second holding member, the steadying member preferably sandwiches the holding member closer to the drive mechanism of the first holding member or the second holding member. Is provided. With this configuration, the steadying member is disposed at a position close to the position where the drive source and the drive transmission member are disposed as the center of the moment that causes horizontal rattling. In the member, the moment generated in the holding member can be reduced. As a result, it is possible to suppress an increase in the load generated on the holding member and the steadying member that sandwiches the holding member.

  In the X-ray fluoroscopic apparatus according to the above aspect, the steadying member is preferably provided so as to contact the holding member over the entire rotation range of the top plate. If comprised in this way, it can suppress that the top plate will rattle over the whole rotation range of the top plate.

  In the X-ray fluoroscopic apparatus according to the above aspect, preferably, the steadying member is provided on each of the one side surface and the other side surface in the longitudinal direction of the top plate of the holding member. Two are provided so as to be lined up in the short direction of the plate. If comprised in this way, compared with the case where one each of the steadying member is provided in each of the one side surface and the other side surface in the longitudinal direction of the top plate, it is effective that the back plate is rattled. Can be suppressed.

  In the configuration in which the two anti-rest members are provided so as to be arranged in the shorter direction of the top plate, preferably, the two anti-rest members provided so as to be arranged in the shorter direction of the top plate are respectively held. It is provided so that it may be located in the vicinity of one end and the other end of the member in the top plate short direction. If comprised in this way, a steadying member can be arrange | positioned in the position apart as much as possible in the transversal direction of a top plate in a holding member. As a result, it is possible to further improve the effect of suppressing rattling of the top plate by providing two each in the lateral direction of the top plate. The vicinity of one end and the vicinity of the other end of the holding member in the short direction of the top plate means the positions of the one end and the other end of the holding member in the short direction of the top plate and the short direction of the top plate of the holding member. It includes both the meaning of the vicinity of the position of one end and the vicinity of the position of the other end.

  In the X-ray fluoroscopic apparatus according to the one aspect described above, preferably, the steadying member includes a steadying rotator that is rotatable in a plane substantially orthogonal to a plane on which the top plate rotates, and the steadying rotator is The outer peripheral surface of the steady-state rotating body is configured to rotate with the rotation of the top plate in a state where the outer peripheral surface is in contact with one surface or the other surface in the longitudinal direction of the top plate of the holding member. If comprised in this way, when the top plate rotates, the frictional resistance between the steady-state rotating body and the holding member on the surface of the holding member on which the steady-state rotating body abuts can be reduced. As a result, it is possible to easily maintain the state in which the steadying member comes into contact with the holding member so as not to hinder the rotation of the top plate relative to the operation axis along the longitudinal direction of the top plate.

  In the configuration in which the steady-rest member includes a steady-rest rotating body, the steady-state member is preferably a bearing having an inner ring disposed on the rotation shaft side of the steady-rest rotating body and an outer ring disposed outside the inner ring. The steady rest rotating body is constituted by an outer ring of a steady rest member. If comprised in this way, the frictional resistance of a steady-rest rotary body and a holding member can be reduced further using the bearing which can carry out relative rotation of an inner ring | wheel and an outer ring | wheel smoothly smoothly.

  According to the present invention, as described above, in the case of having a configuration for guiding the rotation of the top plate with respect to the operation axis along the longitudinal direction of the top plate, it is caused by suppressing occurrence of rattling on the top plate. Thus, it is possible to provide an X-ray fluoroscopic apparatus capable of suppressing a decrease in the positional accuracy of the subject placed on the top board.

(A) is a side view which shows the whole structure of the X-ray fluoroscopic imaging apparatus by one Embodiment of this invention. (B) is a front view showing an overall configuration of an X-ray fluoroscopic apparatus according to an embodiment of the present invention. It is sectional drawing along the 91-91 line | wire of Fig.1 (a). FIG. 3 is a cross-sectional view taken along line 92-92 in FIG. 2. It is sectional drawing along line 93-93 of Fig.1 (a). (A) is the figure which showed the state which fixed the top plate in the horizontal position. (B) is the figure which showed the state fixed in the position which rotated the top plate to the one end of the rotation range. (C) is the figure which showed the state fixed to the position which rotated the top plate to the other end of the rotation range. (A) is a cross-sectional top view of the X-ray fluoroscopic imaging apparatus by the modification of one Embodiment of this invention. (B) is a cross-sectional side view of an X-ray fluoroscopic apparatus according to a modification of one embodiment of the present invention.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will be described below with reference to the drawings.

  With reference to FIGS. 1-4, the structure of the X-ray fluoroscopic imaging apparatus 100 by one Embodiment of this invention is demonstrated.

(Configuration of X-ray fluoroscopic apparatus)
As shown in FIG. 1, the X-ray fluoroscopic apparatus 100 of the present embodiment includes a top plate 1 for placing a subject P, a top plate support unit 2 for supporting the top plate 1, and a top plate. 1 and a pedestal 3 provided below the top support 2 (Z2 side), an imaging unit 4 for X-ray fluoroscopic or X-ray imaging of the subject P, and the longitudinal direction (X-axis direction) ), And a drive mechanism 10 for moving the relative position of the top plate 1 and the photographing unit 4 by the rotation of the top plate 1 with respect to the operation axis A (see FIG. 4 and the like).

  The top plate 1 is formed in a rectangular flat plate shape in plan view. The subject P has a direction in which the head and foot direction of the subject P is along the long side of the rectangle (longitudinal direction of the top plate 1), and a direction in which the left and right direction of the subject P is along the short side of the rectangle (on the top plate 1). It is placed on the top board 1 so as to be in the short direction. In this specification, the top plate longitudinal direction which is the longitudinal direction of the top plate 1 is the X-axis direction, the top plate short direction which is the short direction of the top plate 1 is the Y-axis direction, and the X-axis direction and Y The vertical direction perpendicular to the axial direction is taken as the Z-axis direction.

  The top plate support 2 is attached to one side (X2 side) in the longitudinal direction of the top plate 1 and below the top plate 1 (Z2 side). The top plate support unit 2 is configured to move the top plate 1 linearly in the top plate longitudinal direction and the top plate short direction, to move the top plate 1 up and down in the vertical direction, and to the operation axis along the top plate short direction. Each moving mechanism or the like that can move the relative position between the top board 1 and the photographing unit 4 by rotation is housed. It should be noted that one end of the top plate 1 in the longitudinal direction of the top plate 1 moves up and down relative to the other part of the top plate 1 by the rotation of the top plate 1 with respect to the operation axis along the short direction of the top plate The top plate 1 is inclined as shown.

  The pedestal 3 is disposed below the top plate support 2 (on the Z2 side), and is configured such that the position does not change with respect to the operation axis A when the top plate 1 rotates. The pedestal 3 is connected to the top plate 1 via a drive mechanism 10 for rotating the top plate 1.

  The imaging unit 4 has an X-ray source, and an X-ray tube device 4 a disposed on one side of the top plate 1, an X-ray receiver 4 b disposed on the other side of the top plate 1, and an X-ray tube device 4a and a C-shaped arm portion 4c for supporting the X-ray receiver 4b.

  The X-ray tube apparatus 4a has an X-ray source, and can be irradiated with X-rays when a voltage is applied by an X-ray tube driving unit (not shown). The X-ray receiver 4b includes an FPD (Flat Panel Detector) and is configured to detect X-rays. As a result, the X-ray fluoroscopic apparatus 100 irradiates X-rays by the X-ray tube apparatus 4a with the subject P placed on the top 1 and receives the X-rays transmitted through the subject P as an X-ray image. By detecting with the instrument 4b, X-ray fluoroscopy or X-ray imaging of the subject P can be performed.

  As shown in FIGS. 2 and 3, the drive mechanism 10 includes a motor 11 attached to the lower surface (the surface on the Z2 side) of the top plate support portion 2 and a sector gear attached to the upper surface (the Z1 side) of the base 3. 12. The drive mechanism 10 is configured to be able to move the relative position between the top plate 1 and the imaging unit 4 by rotating the top plate 1 with respect to the operation axis A along the top plate longitudinal direction. The motor 11 is an example of the “drive source” in the claims. The sector gear 12 is an example of the “drive transmission member” in the claims.

  The motor 11 is attached to an end portion on one side (X2 side) of the top plate 1 in the longitudinal direction. The motor 11 has a motor main body 11a and a substantially disk-shaped gear 11b attached to the tip of a rotating shaft protruding from the motor main body 11a in the X1 direction. When the motor body 11a is driven, the gear 11b is configured to rotate in the YZ plane as the rotation shaft rotates.

  The sector gear 12 has a sector-shaped recess when viewed from the X-axis direction, and is configured such that gear teeth formed in the recess mesh with the gear 11b. The sector gear 12 is fixed to the upper surface (Z1 side) of the base 3. Thereby, the top plate 1 can be rotated in the YZ plane with the rotation of the gear 11b by driving the motor body 11a.

  As shown in FIGS. 1 to 4, the X-ray fluoroscopic apparatus 100 of the present embodiment includes a plurality (two) of arc-shaped holding members 20 (21) provided below the top plate 1 (Z2 side). 22), a plurality of (four) guide bearings 40 for guiding the rotation (rolling operation) of the top plate 1 with respect to the operation axis A, and horizontal directions other than the rotation of the top plate 1 with respect to the operation axis A And a plurality of (four) steady-state bearings 50 (51, 52, 53, 54) for suppressing the shaking motion in the top plate longitudinal direction and the top plate short direction. The arc-shaped holding member 20 is an example of the “holding member” in the claims. The guide bearing 40 is an example of the “guide member” in the claims. The steady-rest bearing 50 is an example of a “stabilization member” in the claims.

  As shown in FIGS. 2 and 3, the arc-shaped holding member 20 includes an arc-shaped holding member 21 and an arc-shaped holding member 22 that are separated from each other in the top plate longitudinal direction (X-axis direction). The arc-shaped holding member 21 is provided on the X1 side with respect to the drive mechanism 10 and on the X2 side with respect to the arc-shaped holding member 22. That is, of the two arc-shaped holding members 20 (the arc-shaped holding member 21 and the arc-shaped holding member 22), the arc-shaped holding member 21 is provided on the side close to the drive mechanism 10. Further, as shown in FIG. 4, the arc-shaped holding member 20 is formed so that the lower surface (Z2 side) as viewed from the X-axis direction is a part of a circle (arc) centering on the operation axis A. Has been. The arc-shaped holding member 21 and the arc-shaped holding member 22 are examples of the “first holding member” and the “second holding member” in the claims, respectively.

  The arc-shaped holding member 20 has a guide groove 30 (31, 32) formed on one side (X2 side) or the other side (X1 side) in the X-axis direction. As shown in FIG. 4, the guide groove 30 includes two surfaces (an upper surface and a lower surface) that are part of a circle (arc) centered on the operation axis A as viewed from the X-axis direction and are concentric with each other. ) And is formed so as to extend in the lateral direction of the top plate while curving so as to protrude downward (Z2 side). That is, the upper and lower surfaces of the guide groove 30 and the lower surface of the arc-shaped holding member 20 are formed so as to be concentric with the operation axis A as the center when viewed from the X-axis direction. Yes. The guide groove 31 and the guide groove 32 are formed on the X2 side of the arc-shaped holding member 21 and the X1 side of the arc-shaped holding member 22, respectively.

  The guide groove 31 includes a bearing rolling surface 31a which is an upper surface (Z1 side) of the arc shape when viewed from the X-axis direction, a lower surface (Z2 side) 31b of the arc shape when viewed from the X-axis direction, It includes a surface 31c on the bottom side (X1 side) of the groove, a surface 31d on one side (Y2 side) in the shorter side of the top plate, and a surface 31e on the other side (Y1 side) in the shorter side of the top plate. As shown in FIG. 4, the bearing rolling surface 31 a is configured to contact guide bearings 41 and 42. Further, the surfaces 31b, 31c, 31d, 31e are configured not to contact the guide bearings 41, 42. The bearing rolling surface 31a is an example of the “guide surface” in the claims.

  The guide groove 32 includes a bearing rolling surface 32a that is an upper surface (Z1 side) of the arc shape when viewed from the X axis direction, and a lower surface (Z2 side) 32b of the arc shape when viewed from the X axis direction. , A bottom surface (X2 side) surface 32c of the groove, a surface 32d on one side (Y2 side) in the short side direction of the top plate, and a surface 32e on the other side (Y1 side) in the short side direction of the top plate. As shown in FIG. 4, the bearing rolling surface 32 a is configured to contact guide bearings 43 and 44. Further, the surfaces 32b, 32c, 32d, and 32e are configured not to contact the guide bearings 43 and 44. The bearing rolling surface 32a is an example of the “guide surface” in the claims.

  Each of the guide bearings 41 and 42 is connected to the bearing rolling surface 31a via a substantially disk-shaped guide bearing outer ring 41a and 42a rotating around a rotation axis extending in the X-axis direction, a bearing inner ring (not shown), and the like. And bearing shaft rods 41b and 42b connected to the guide bearing outer rings 41a and 42a. The guide bearings 43 and 44 are substantially disc-shaped guide bearing outer rings 43a and 44a that rotate around a rotation axis that extends in the X-axis direction in contact with the bearing rolling surface 32a, a bearing inner ring (not shown), and the like. Bearing shafts 43b, 44b connected to the guide bearing outer rings 43a, 44a through the bearings. The ends of the guide bearings 40 (41, 42, 43, 44) opposite to the guide bearing outer rings 41a, 42a, 43a, 44a are fixed to the base 3. The guide bearing outer rings 41a, 42a, 43a, 44a are examples of the “guide rotating body” in the claims.

  The guide bearings 41 and 42 are arranged side by side in the top plate short direction so that the respective rotation shafts extending in the top plate long direction (X axis direction) are parallel to the top plate short direction (Y axis direction). Has been. As shown in FIG. 5, the outer peripheral surfaces of the guide bearing outer rings 41a and 42a come into contact with the bearing rolling surface 31a when the top plate 1 rotates with respect to the operation axis A along the top plate longitudinal direction. It is comprised so that the state which carried out may be maintained.

  The guide bearings 43 and 44 are the same as the guide bearings 41 and 42 so that the respective rotation axes extending in the top plate longitudinal direction (X axis direction) are parallel to the top plate short direction (Y axis direction). In addition, they are arranged side by side in the width direction of the top plate. As shown in FIG. 5, the guide bearing outer rings 43a and 44a are configured to rotate the top plate 1 with respect to the operation axis A along the top plate longitudinal direction while contacting the bearing rolling surface 32a. .

  As shown in FIGS. 2 and 3, the steady rest bearing 50 (51, 52, 53, 54) is a surface 21a on one side (X2 side) of the arc-shaped holding member 21 in the top plate longitudinal direction (X-axis direction). In addition, two pieces are arranged on the other side (X1 side) 21b so as to be arranged in the transversal direction of the top plate (Y-axis direction) in contact with the arc-shaped holding member 21 in the longitudinal direction of the top plate. It is provided one by one.

  Specifically, the steady bearings 51 and 52 are provided so as to contact the one surface 21 a of the arc-shaped holding member 21. The steady-rest bearings 51 and 52 are provided in the vicinity of one side (Y2 side) and the other side (Y1 side) in the top plate lateral direction, respectively.

  The steady rest bearings 53 and 54 are provided so as to contact the other surface 21 b of the arc-shaped holding member 21. The steady rest bearings 53 and 54 are provided so as to be positioned in the vicinity of one side (Y2 side) and in the vicinity of the other side (Y1 side) in the top plate lateral direction, respectively.

  The anti-slip bearings 51, 52, 53, 54 are respectively anti-sway bearing outer rings 51a, 52a, 53a, 54a that are rotatable in a plane substantially orthogonal to the plane (YZ plane) on which the top plate 1 rotates. An inner ring (not shown) arranged inside the stationary bearing outer rings 51a, 52a, 53a, 54a, and bearing shaft rods 51b, 52b connected to the inner ring and corresponding to the rotation shafts of the steady bearing outer rings 51a, 52a, 53a, 54a , 53b, 54b. That is, the steady bearing 50 (51, 52, 53, 54) is an inner ring arranged on the rotation shaft side of the steady bearing outer rings 51a, 52a, 53a, 54a and an outer ring arranged outside the inner ring. This is a bearing having anti-sway bearing outer rings 51a, 52a, 53a, 54a. The anti-slip bearing outer rings 51a, 52a, 53a, 54a are examples of the “anti-rotation rotating body” in the claims.

  As shown in FIG. 4, the steady bearing 50 (53, 54) has a steady bearing outer ring 53a, 54a below the guide groove 30 (31) formed in the arc-shaped holding member 20 (21) (on the Z2 side). ) In contact with the surface 21b on the other side (X1 side) in the X-axis direction of the arc-shaped holding member 20 (21). Specifically, the steady bearing outer rings 53a and 54a are formed between the arc-shaped holding member 20 between the lower surface 31b of the guide groove 30 (31) and the lower surface of the arc-shaped holding member 20 (21). It is comprised so that it may contact (21). For this reason, the outer peripheral surfaces of the steady bearing outer rings 53a and 54a are inclined so that the rotational axes of the steady bearing outer rings 53a and 54a are directed to the operation axis A when viewed from the X-axis direction.

  As shown in FIG. 5, the anti-rest bearing outer rings 53a and 54a are provided on the lower surface of the guide groove 30 (31) when the top plate 1 rotates with respect to the operation axis A along the top plate longitudinal direction. A state in which the surface 21b is in contact with the lower surface of the arc-shaped holding member 20 (21) is maintained. That is, the steady bearing 50 is provided so as to contact the arc-shaped holding member 20 over the entire rotation range of the top plate 1.

  Although not shown in FIG. 4, the steady bearings 50 (51, 52) are similar to the steady bearings 50 (53, 54), and the steady bearing outer rings 51 a, 52 a are arc-shaped holding members 20. Under the guide groove 30 (31) formed in (21) (Z2 side), the arc-shaped holding member 20 (21) is configured to contact one side (X2 side) surface 21a in the X-axis direction. .

(Guide and steady rest for top plate rotation)
Next, the guide by the guide bearing 40 and the steadying by the steadying bearing 50 in the rotation of the top plate 1 with respect to the operation axis A along the longitudinal direction of the top plate will be described in detail with reference to FIG.

  When the top plate 1 is rotated by a desired angle with respect to the operation axis A by the drive mechanism 10, from the state of FIG. 5 (a) to the state of FIG. 5 (b) or FIG. 5 (c), The top plate 1, the top plate support 2 and the arc-shaped holding member 20 rotate counterclockwise or clockwise in the YZ plane.

  When the top plate 1 rotates in the YZ plane, the guide bearings 41 and 42 rotate while the guide bearing outer rings 41a and 42a abut against the bearing rolling surface 31a. That is, the guide bearings 41 and 42 guide the rotation of the top plate 1 while in contact with the arc-shaped holding member 21 provided separately from the drive mechanism 10. Further, since the guide bearing outer rings 41a and 42a rotate while abutting against the bearing rolling surface 31a, the guide bearings 41 and 42 and the arc-shaped holding member are compared with the case where the guide bearing outer rings 41a and 42a do not rotate. Friction resistance with 21 is reduced.

  Further, the guide bearings 43 and 44 rotate while the guide bearing outer rings 43a and 44a abut against the bearing rolling surface 32a when the top plate 1 rotates in the YZ plane. That is, the guide bearings 43 and 44 guide the rotation of the top plate 1 while in contact with the arc-shaped holding member 22 provided separately from the drive mechanism 10. Further, since the guide bearing outer rings 43a and 44a rotate while contacting the bearing rolling surface 32a, the guide bearings 43 and 44 and the arc-shaped holding member are compared with the case where the guide bearing outer rings 43a and 44a do not rotate. Friction resistance with 22 is reduced.

  As described above, the guide bearings 41 and 42 are configured such that the guide groove 31 does not contact the bottom surface 31c of the guide groove 31 (that is, there is a gap in the horizontal direction). As a result, the arc-shaped holding member 21 (and thus the top plate 1) is likely to be rattled in the horizontal direction. Further, since the guide bearings 43 and 44 are configured so as not to contact the bottom surface 32c of the guide groove 32 (that is, there is a gap in the horizontal direction) in the guide groove 32, the arc-shaped holding is maintained. The member 22 (and thus the top plate 1) is likely to be swayed in the horizontal direction.

  However, in the X-ray fluoroscopic apparatus 100 of the present embodiment, the plurality of steady bearings 50 (51, 52, 53, 54) are provided on one side 21a and the other side in the longitudinal direction of the top plate of the arc-shaped holding member 21. Two of each surface 21b are provided in contact with each other so as to sandwich the arc-shaped holding member 21 in the longitudinal direction of the top plate. Therefore, the horizontal shake operation other than the rotation of the top plate 1 is suppressed.

  As shown in FIG. 5B, the top plate 1 is rotated counterclockwise until the guide bearing 40 on the other side (Y1 side) in the lateral direction of the top plate contacts the surface 31e on the Y1 side of the guide groove 30. Can be rotated. In this state, the Y1 side steady rest bearing 50 is located in the vicinity of the end portion on the Y1 side on the one side (X2 side) or the other side (X1 side) of the arc-shaped holding member 20.

  Further, as shown in FIG. 5C, the top plate 1 is watched until the guide bearing 40 on one side (Y2 side) in the short side direction of the top plate is in contact with the surface 31d on the Y2 side of the guide groove 30. Can rotate around. In this state, the Y2 side steady rest bearing 50 is located in the vicinity of the end portion on the Y2 side on the surface on one side (X2 side) or the other side (X1 side) of the arc-shaped holding member 20.

  In other words, the two steady rest bearings 50 provided so as to be arranged in the top plate short direction (Y-axis direction) are arranged in the arc-shaped holding member 20 as far as possible in the top plate short direction. ing. Therefore, compared with the case where the two steady rest bearings 50 are not relatively separated from each other, it is possible to suppress the operation of the top plate 1 turning in the horizontal direction. Therefore, the effect of suppressing the occurrence of horizontal play in the top plate 1 is further improved.

(Effect of this embodiment)
In the present embodiment, the following effects can be obtained.

  In the present embodiment, as described above, the X-ray fluoroscopic apparatus 100 includes the bearing rolling surfaces 31 a and 32 a that are in contact with the guide bearings 40 (41, 42, 43, and 44) that guide the rotation of the top plate 1. And two arc-shaped holding members 21 and 22 provided below the top plate 1 (Z2 side), and one side (X2 side) surface of the arc-shaped holding member 21 in the top plate longitudinal direction (X-axis direction) At least one arc-shaped holding member 21 is sandwiched and abutted on each of the surface 21b and the other side (X1 side) 21b in the longitudinal direction of the top plate, and the horizontal direction other than the rotation of the top plate 1 A plurality of steady bearings 50 (51, 52, 53, 54) that suppress the swinging motion of Thus, the guide bearing 40 guides the rotation of the top plate 1 while being in contact with the bearing rolling surfaces 31a, 32a of the arc-shaped holding member 20 (21, 22), and the arc-shaped holding member 20 is in the longitudinal direction of the top plate. It is possible to suppress a horizontal shake operation other than the rotation of the top plate 1 while being in contact with the steady bearing 50 so as to be sandwiched between the two. As a result, in the case of having a configuration for guiding the rotation of the top plate 1 with respect to the operation axis A along the longitudinal direction of the top plate 1, the top plate 1 is caused by suppressing occurrence of rattling in the top plate 1. It is possible to suppress a decrease in the positional accuracy of the subject P placed on the. Further, by providing a steady bearing 50 on each of one surface 21a and the other surface 21b in the longitudinal direction of the top plate of the single arc-shaped holding member 21, a plurality of arc-shaped holding members 20 (21, 21) are provided. Compared with the case where each of the anti-rest bearings 50 is provided in 22), the positioning of the plurality of anti-rest bearings 50 can be performed with reference to only the single arc-shaped holding member 20 (21). As a result, even when the rotation position of the top plate 1 is changed, the steady-state bearing 50 can be easily maintained in a state where the arc-shaped holding member 20 is held in contact with the top plate in the longitudinal direction. It is possible to easily suppress the horizontal deflection operation other than the rotation of the plate 1.

  Further, in the present embodiment, as described above, the guide bearings 40 (41, 42, 43, 44) are arranged so as to rotate the bearings of the arc-shaped holding members 20 (21, 22) when the top plate 1 rotates. It includes guide bearing outer rings 41a, 42a, 43a, 44a that guide the rotation of the top plate 1 by rotating in contact with the moving surfaces 31a, 32a. Thereby, when the top plate 1 rotates, the frictional resistance between the bearing 40 for guide and the arc-shaped holding member 20 on the bearing rolling surfaces 31a and 32a can be reduced. As a result, it is possible to efficiently guide the rotation of the top plate 1 with respect to the operation axis A along the top plate longitudinal direction (X-axis direction).

  In the present embodiment, as described above, the arc-shaped holding member 20 includes the arc-shaped holding member 21 and the arc-shaped holding member 22 that are separated from each other in the top plate longitudinal direction (X-axis direction). The steady rest bearings 50 (51, 52, 53, 54) are provided so as to sandwich and contact only the arc-shaped holding member 21. Thereby, since the rotation of the top plate 1 can be guided at a plurality of positions separated in the longitudinal direction of the top plate, the rotation of the top plate 1 is compared with the case where only one arc-shaped holding member 20 is guided. Thus, the rotation of the top plate 1 can be stably guided. As a result, while the rotation of the top plate 1 is stably guided, even when the rotation position of the top plate 1 changes, the steady-state bearing 50 can easily hold the holding member in the longitudinal direction of the top plate. Can be maintained.

  In the present embodiment, as described above, the steady rest bearing 50 (51, 52, 53, 54) is the arc type of the arc type holding member 21 or the arc type holding member 22 on the side close to the drive mechanism 10. It is provided so as to sandwich the holding member 21. As a result, the steady-state bearing 50 is disposed at a position close to the position where the motor 11 and the sector gear 12 are disposed as the center of the moment that causes horizontal rattling, so that the steady-state bearing 50 sandwiches the arc-shaped holding. In the member 21, the moment generated in the arc-shaped holding member 21 can be reduced. As a result, it is possible to suppress an increase in the load generated in the arc-shaped holding member 20 and the steady-rest bearing 50 that sandwiches the arc-shaped holding member 20.

  In the present embodiment, as described above, the steady bearing 50 is provided so as to contact the arc-shaped holding member 20 over the entire rotation range of the top plate 1. Thereby, it is possible to suppress the backlash of the top plate 1 from occurring over the entire rotation range of the top plate 1.

  Further, in the present embodiment, as described above, the steady bearing 50 includes the one side (X2 side) surface 21a and the other side (X1 side) of the arc-shaped holding member 20 in the top plate longitudinal direction (X-axis direction). Two are provided on each of the surfaces 21b so as to be aligned in the short side direction (Y-axis direction) which is the short side direction of the top plate 1. Thereby, compared with the case where one steadying bearing 50 is provided on each of the one side surface and the other side surface in the longitudinal direction of the top plate, it is possible to effectively prevent the top plate 1 from rattling. Can be suppressed.

  Further, in the present embodiment, as described above, the two steady rest bearings 50 provided so as to be arranged in the top plate short direction (Y-axis direction) are each the top plate short side in the arc-shaped holding member 20. It is provided so as to be located in the vicinity of one end (Y2 side) and the other end (Y1 side) in the direction. Thereby, in the arc-shaped holding member 20, the steady rest bearing 50 can be arrange | positioned in the position as far away as possible in the top plate short direction. As a result, it is possible to further improve the effect of suppressing the backlash of the top plate 1 by providing two each in the widthwise direction of the top plate.

  Further, in the present embodiment, as described above, the anti-spinning bearing 50 (51, 52, 53, 54) is the anti-spinning bearing outer ring 51a that can rotate in a plane substantially orthogonal to the plane on which the top plate 1 rotates. , 52a, 53a, 54a, and the anti-rest bearing outer rings 51a, 52a, 53a, 54a are arranged so that the outer peripheral surfaces of the anti-rest bearing outer rings 51a, 52a, 53a, 54a are in the longitudinal direction of the top plate of the arc-shaped holding member 21 (X-axis). In the state where the top plate 1 is in contact with the surface 21a on one side (X2 side) or the surface 21b on the other side (X1 side) in the direction), the top plate 1 is configured to rotate. As a result, when the top plate 1 rotates, the steady bearing outer rings 51a, 52a, 53a, 54a and the arc shape on the surface of the arc-shaped holding member 21 on which the steady bearing outer rings 51a, 52a, 53a, 54a abut. The frictional resistance with the holding member 21 can be reduced. As a result, the steady-state bearing 50 (51, 52, 53, 54) contacts the arc-shaped holding member 21 without interfering with the rotation of the top plate 1 with respect to the operation axis A along the top plate longitudinal direction. The maintained state can be easily maintained.

  In the present embodiment, as described above, the steady bearing 50 (51, 52, 53, 54) includes the inner ring and the inner ring arranged on the rotation shaft side of the steady bearing outer rings 51a, 52a, 53a, 54a. The anti-rest bearing outer rings 51a, 52a, 53a, 54a are constituted by the outer ring of the anti-rest bearing 50 (51, 52, 53, 54). Thereby, the frictional resistance between the steady bearing outer rings 51a, 52a, 53a, 54a and the arc-shaped holding member 21 can be further reduced by using a bearing capable of smoothly rotating the inner ring and the outer ring relatively. .

[Modification]
The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiment but by the scope of claims for patent, and further includes all modifications (modifications) within the meaning and scope equivalent to the scope of claims for patent.

  For example, in the above embodiment, the steady bearing 50 is provided on each of the surface 21a on one side (X2 side) and the surface 21b on the other side (X1 side) in the top plate longitudinal direction (X-axis direction) of the arc-shaped holding member 20. In the above, an example in which two (the same number) are provided so as to be arranged in the lateral direction of the top plate (Y-axis direction) is shown, but the present invention is not limited thereto. In the present invention, three or more steady rest bearings 50 are provided on each of the one surface 21a and the other surface 21b in the longitudinal direction of the top plate of the arc-shaped holding member 20 so as to be arranged in the top plate short direction. Alternatively, it may be provided one by one in the top plate lateral direction (Y-axis direction).

  Further, in the above embodiment, the steady bearing 50 is provided on each of the surface 21a on one side (X2 side) and the surface 21b on the other side (X1 side) in the top plate longitudinal direction (X-axis direction) of the arc-shaped holding member 20. In the above, an example in which two pieces are provided so as to be arranged in the short side direction (Y-axis direction) is shown, but the present invention is not limited to this. In the present invention, the steady bearing 50 is different from the one surface 21a and the other surface 21b on the one surface 21a and the other surface 21b in the longitudinal direction of the top plate of the arc-shaped holding member 20, respectively. A number may be provided.

  In the above-described embodiment, the example in which the steady bearing 50 is provided so as to sandwich only the arc-shaped holding member 21 on the side close to the drive mechanism 10 among the plurality of arc-shaped holding members 21 and 22 is shown. The present invention is not limited to this. In the present invention, the steady bearing 50 may be provided so as to sandwich only the arc-shaped holding member 22 on the side far from the drive mechanism 10.

  Moreover, in the said embodiment, the example which provided the arc-shaped holding member 20 of the arc-shaped holding member 21 and the arc-shaped holding member 22 which were mutually separated in the longitudinal direction (X-axis direction) of the top plate 1 as the arc-shaped holding member 20 is shown. However, the present invention is not limited to this. In the present invention, three or more arc-shaped holding members 20 may be provided, or one arc-shaped holding member 20 may be provided. When one arc-shaped holding member 20 is provided, the arc-shaped holding members 21 and 22 in the X-ray fluoroscopic apparatus 100 (see FIG. 2) of the above-described embodiment are used, for example, as in a modification shown in FIG. An arc-shaped holding member 220 that is integrally formed may be provided. Here, the arc-shaped holding member 220 has a guide groove 231 including a bearing rolling surface 231a and a guide groove 232 including a bearing rolling surface 232a on one side (X2 side) and the other side (X1 side) in the longitudinal direction. Have In addition, the arc-shaped holding member 220 includes anti-spindle bearings 51 and 52 that come into contact with one surface 220a of the arc-shaped holding member 220, and an anti-shake bearing 253 that comes into contact with the other surface 220b of the arc-shaped holding member 220, 254. The arc-shaped holding member 220 is an example of the “holding member” in the claims. The bearing rolling surfaces 231a and 232a are examples of “guide surfaces” in the claims. Further, the anti-slip bearings 253 and 254 are examples of the “anti-sway member” in the claims.

  Moreover, in the said embodiment, the two steadying bearings 50 provided so that it may be located in a line with a top-plate short direction (Y-axis direction) are each one end ( Although the example provided to be located near the Y2 side) and near the other end (Y1 side) is shown, the present invention is not limited to this. In the present invention, the two steady rest bearings 50 provided so as to be arranged in the top-to-bottom direction may be provided in the center portion of the arc-shaped holding member 20 in the top-to-bottom direction. In addition, one of the two steady bearings 50 provided so as to be arranged in the shorter direction of the top plate is positioned near one end or the other end in the shorter direction of the top plate. The other steady rest bearing 50 may be provided in the central portion of the top plate in the lateral direction.

  Moreover, in the said embodiment, although the example comprised so that the top plate 1 might be rotated by the drive mechanism 10 which has the motor 11 and the sector gear 12, the present invention is not limited to this. In the present invention, a mechanism different from the drive mechanism 10 may be provided as long as the top plate 1 can be rotated with respect to the operation axis A along the top plate longitudinal direction.

  In the above-described embodiment, the guide member outer ring 41a, 42a, 43a, 44a having a substantially disk shape that rotates around the rotation axis extending in the X-axis direction in contact with the bearing rolling surfaces 31a, 32a as the guide member; Guide bearings 40 (41, 42, 43, 44), which are bearings including bearing shaft rods 41b, 42b, 43b, 44b connected to guide bearing outer rings 41a, 42a, 43a, 44a via bearing inner rings (not shown). Although the example provided with 44) is shown, the present invention is not limited to this. In the present invention, if the rotation of the top plate 1 is guided by rotating in contact with the guide surface of the arc-shaped holding member 20 when the top plate 1 rotates, for example, a guide member other than the bearing is provided. It may be.

  Further, in the above embodiment, the guide bearing outer rings 41a, 42a, 43a, 44a are rotated so as to be in contact with the bearing rolling surfaces 31a, 32a of the arc-shaped holding member 20 when the top plate 1 rotates. Although the example which comprised was shown, this invention is not limited to this. In the present invention, when the top plate 1 rotates, a guide member that does not rotate may be provided as long as it contacts the bearing rolling surfaces 31 a and 32 a of the arc-shaped holding member 20. In this case, it is desirable that the bearing rolling surfaces 31a and 32a and the guide member are surface-treated so as to reduce mutual frictional resistance.

  Further, in the above embodiment, as the steadying member, the steadying bearing outer ring 51a, 52a, 53a, 54a is provided with the inner ring disposed on the rotating shaft side and the steadying bearing outer ring 51a which is the outer ring disposed outside the inner ring. , 52a, 53a, and 54a are provided as an example, but the present invention is not limited to this. In the present invention, as long as it has an anti-rotation rotating body that can rotate in a plane substantially orthogonal to the surface on which the top plate 1 rotates, an anti-vibration member other than a bearing may be provided, for example.

  Moreover, in the said embodiment, when the top plate 1 rotates the anti-slip bearing outer rings 51a, 52a, 53a, 54a, the outer peripheral surfaces of the anti-slip bearing outer rings 51a, 52a, 53a, 54a are the arc-shaped holding member 20. The top plate 1 is configured to rotate as the top plate 1 rotates in contact with the one side (X2 side) surface or the other side (X1 side) surface in the longitudinal direction (X-axis direction). Although an example is shown, the present invention is not limited to this. In the present invention, when the top plate 1 is rotated, it comes into contact with one side (X2 side) surface or the other side (X1 side) surface of the arc-shaped holding member 20 in the top plate longitudinal direction (X-axis direction). For example, a non-rotating member may be provided in place of the steady rest rotating body. In this case, the one side (X2 side) surface or the other side (X1 side) surface of the arc-shaped holding member 20 in the longitudinal direction (X-axis direction) or the other side (X1 side) and the anti-rest rotating body reduce the mutual frictional resistance. It is desirable that the surface be processed.

  Moreover, in the said embodiment, the linear movement of the top plate 1 to a top plate longitudinal direction and a top plate short direction, the raising / lowering of the top plate 1 up-down direction, and the top plate 1 with respect to the operation axis along a top plate short direction. Although the example which accommodated each moving mechanism which can move the relative position of the top plate 1 and the imaging | photography part 4 by rotation in the top-plate support part 2 was shown, this invention is not limited to this. In the present invention, the moving mechanism is arranged at a position other than the top plate support portion 2 attached to one side (X2 side) of the top plate 1 in the longitudinal direction of the top plate and below the top plate 1 (Z2 side). May be.

DESCRIPTION OF SYMBOLS 1 Top plate 4 Image pick-up part 10 Drive mechanism 11 Motor (drive source)
12 Fan gear (drive transmission member)
20, 220 Arc-shaped holding member (holding member)
21 Arc-shaped holding member (first holding member)
21a, 22a, 220a One side surface (in the longitudinal direction of the holding member) 21b, 22b, 220b The other side surface (in the longitudinal direction of the holding member) 22 Arc-shaped holding member (second holding member)
31a, 32a, 231a, 232a Bearing rolling surface (guide surface)
40 (41, 42, 43, 44) Guide bearing (guide member)
41a, 42a, 43a, 44a Guide bearing outer ring (rotating body for guide)
50 (51, 52, 53, 54), 253, 254 steady bearing (stable member)
51a, 52a, 53a, 54a Anti-slip bearing outer ring (anti-rotation body)
A Movement axis P Subject

Claims (9)

A top plate on which the subject is placed;
An imaging unit that irradiates the subject with X-rays and detects X-rays transmitted through the subject to perform X-ray fluoroscopy or X-ray imaging;
A relative position between the top plate and the imaging unit is obtained by rotating the top plate with respect to an operation axis along the top plate longitudinal direction which is a longitudinal direction of the top plate, including a drive source and a drive transmission member. A movable drive mechanism;
A guide member that is provided separately from the drive mechanism and guides the rotation of the top plate;
Including a guide surface in contact with the guide member, and at least one holding member provided below the top plate;
At least one piece is provided so as to sandwich and hold the holding member in the top plate longitudinal direction on each of the one side surface and the other side surface in the top plate longitudinal direction of the single holding member, An X-ray fluoroscopic apparatus comprising: a plurality of anti-sway members that suppress horizontal movement operations other than rotation of the top plate.   The guide member includes a guide rotating body that guides rotation of the top plate by rotating in contact with the guide surface of the holding member when the top plate rotates. The X-ray fluoroscopic apparatus described. The holding member has a first holding member and a second holding member which are spaced apart from each other in the top plate longitudinal direction,
The X-ray fluoroscopic apparatus according to claim 1, wherein the plurality of steadying members are provided so as to sandwich and contact only one of the first holding member and the second holding member.   The X-ray fluoroscopic apparatus according to claim 3, wherein the steadying member is provided so as to sandwich the holding member closer to the drive mechanism among the first holding member or the second holding member. .   The X-ray fluoroscopic apparatus according to claim 1, wherein the steadying member is provided so as to contact the holding member over the entire rotation range of the top plate.   Two pieces of the anti-sway member are arranged so as to be arranged in the short side direction of the top plate which is the short side direction of the top plate on each of the one side surface and the other side surface in the longitudinal direction of the top plate of the holding member. The X-ray fluoroscopic apparatus according to claim 1, which is provided.   The two anti-rest members provided so as to be arranged in the short direction of the top plate are provided so as to be positioned in the vicinity of one end and in the vicinity of the other end of the holding member in the short direction of the top plate, respectively. The X-ray fluoroscopic apparatus according to claim 6. The steadying member includes a steadying rotator that is rotatable in a plane substantially orthogonal to a plane on which the top plate rotates,
The anti-rotation body rotates as the top plate rotates in a state where the outer peripheral surface of the anti-rotation body is in contact with one surface or the other surface in the longitudinal direction of the holding member. The X-ray fluoroscopic imaging apparatus according to claim 1, wherein the X-ray fluoroscopic imaging apparatus is configured to. The steady-rest member is a bearing having an inner ring disposed on the rotation shaft side of the steady-rest rotating body and an outer ring disposed outside the inner ring,
The X-ray fluoroscopic apparatus according to claim 8, wherein the steady-state rotating body is configured by the outer ring of the steady-state member.

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