WO2015087432A1 - X線装置 - Google Patents
X線装置 Download PDFInfo
- Publication number
- WO2015087432A1 WO2015087432A1 PCT/JP2013/083371 JP2013083371W WO2015087432A1 WO 2015087432 A1 WO2015087432 A1 WO 2015087432A1 JP 2013083371 W JP2013083371 W JP 2013083371W WO 2015087432 A1 WO2015087432 A1 WO 2015087432A1
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- WIPO (PCT)
- Prior art keywords
- gantry
- ray
- ray apparatus
- vibration isolation
- moving mechanism
- Prior art date
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
- G01N23/04—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2223/00—Investigating materials by wave or particle radiation
- G01N2223/30—Accessories, mechanical or electrical features
- G01N2223/308—Accessories, mechanical or electrical features support of radiation source
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2223/00—Investigating materials by wave or particle radiation
- G01N2223/30—Accessories, mechanical or electrical features
- G01N2223/33—Accessories, mechanical or electrical features scanning, i.e. relative motion for measurement of successive object-parts
Definitions
- the present invention relates to an X-ray apparatus.
- an X-ray inspection apparatus having a frame (frame) to which at least an X-ray tube is attached is known (for example, Patent Document 1).
- the X-ray inspection apparatus disclosed in Patent Document 1 requires a mechanism for pulling out the X-ray source from the casing for maintenance of the X-ray source.
- the moving mechanism is provided between the frame and the vibration-proof mount, there is a problem that vibration cannot be sufficiently attenuated and an accurate X-ray measurement result cannot be obtained.
- an X-ray apparatus includes an X-ray source that irradiates an object to be measured with X-rays, a frame on which the X-ray source is mounted, and a vibration isolation mechanism that attenuates vibration applied to the frame. And a moving mechanism for moving the gantry and the vibration isolation mechanism together.
- the gantry detects the X-ray that has been irradiated from the X-ray source and transmitted through the measurement object. It is preferable to further mount an X-ray detector.
- the X-ray apparatus further includes a base that supports the moving mechanism, and the moving mechanism is configured to support the gantry via the vibration isolation mechanism.
- the moving mechanism includes a guide rail and a plurality of moving members that move relatively along the guide rail, and the vibration isolation mechanism. It is preferable that the moving member is located below the vertical direction.
- the moving mechanism has a structure in which a leg portion for supporting the gantry can be mounted below the moving member.
- the movement mechanism has a predetermined movement amount out of the total movable amount of the gantry when the legs are mounted, It is preferable to have a regulating member that temporarily regulates the movement of the gantry.
- the X-ray apparatus includes a casing in which the gantry is accommodated, and the base forms a part of the casing and is at a position where the predetermined movement amount is obtained. It is preferable that at least a part of the gantry is exposed from the casing.
- the vibration isolation mechanism is provided inside the lower surface of the gantry rather than the outer edge of the lower surface of the gantry.
- the X-ray is detected from a plurality of different directions while changing the relative position between the X-ray detector and the object to be measured. It is preferable to include a reconstruction unit that calculates the internal structure of the object to be measured based on the projection image of the object to be measured when is transmitted through the object to be measured.
- the moving mechanism can integrally move the gantry on which the X-ray source is mounted and the vibration isolation mechanism that attenuates the vibration applied to the gantry. It is possible to obtain an X-ray apparatus that attenuates the applied vibration well and is hardly affected by the vibration.
- the internal front view of the X-ray apparatus by embodiment of this invention The internal side view of the X-ray apparatus by embodiment of this invention
- the internal top view of the X-ray apparatus by embodiment of this invention Side view when a specified amount of movement is pulled out of the chassis from the chassis.
- Perspective view of the gantry from below The perspective view explaining the external appearance of a movement control mechanism
- An X-ray apparatus integrally moves a mounting table on which an object to be measured is mounted, an X-ray source and an X-ray detector, and a vibration isolation mechanism that attenuates vibration applied to the mounting frame.
- a moving mechanism is provided in the housing. That is, the X-ray apparatus is configured so that the gantry can be pulled out of the casing during maintenance and inspection of each part mounted on the gantry.
- the vibration generated from the outside of the housing and the vibration generated by the vibration from the outside of the housing acting on the moving mechanism mounted for pulling out the gantry is transmitted to the gantry.
- the X-ray apparatus irradiates the object to be measured with X-rays and detects transmitted X-rays that have passed through the object to be measured, thereby obtaining non-destructive X information (for example, internal structure) of the object to be measured.
- This is a line CT inspection apparatus.
- an object to be measured is an industrial part such as a machine part or an electronic part
- the X-ray apparatus is called an industrial X-ray CT inspection apparatus.
- the present embodiment is for concrete description for understanding the gist of the invention, and does not limit the present invention unless otherwise specified by X-ray.
- FIG. 1 to 5 are views showing an example of the internal structure of the X-ray apparatus 100 according to this embodiment.
- FIG. 1 is an internal front view of the X-ray apparatus 100
- FIG. 2 is an internal side view of the X-ray apparatus 100.
- 3 is an internal plan view of the X-ray apparatus 100
- FIG. 4 is a side view when a predetermined amount of movement of the pedestal housed inside the housing is pulled out of the housing
- FIG. 5 is housed inside the housing. It is a side view at the time of pulling out a mount frame outside a housing
- a coordinate system including the X axis, the Y axis, and the Z axis along the vertical direction is set as illustrated.
- the X-ray apparatus 100 includes a housing 1, a gantry 2, an X-ray source control device 3, and a stage control device 4.
- the casing 1 is disposed on a floor surface of a factory or the like so as to be substantially parallel (horizontal) to the XY plane, and a frame 2, an X-ray source control device 3, and a stage control device 4 are accommodated therein.
- the housing 1 includes outer wall surfaces 11 and 12 that are substantially parallel to the XZ plane, an outer wall surface 13 (see FIG. 2) that is substantially parallel to the YZ plane, an upper wall surface 14, and a first bottom surface 15.
- the door 18 (see FIG. 2) has a hollow box-like structure.
- the door 18 is attached to any of the X-axis-side end portions of the outer wall surfaces 11 to 12, the upper wall surface 14, and the first bottom surface 15, and is provided so as to be openable and closable.
- second bottom surfaces 16 a and 16 b (generally denoted by reference numeral 16, respectively) substantially parallel to the XY plane, and the first bottom surface 15 has a second bottom surface.
- Inner wall surfaces 17a and 17b that support 16a and 16b, respectively reference numeral 17 is given when collectively referred to
- the gantry 2 is movably mounted on the outside of the housing 1 along the X-axis direction from the space SP1 shown in the drawing.
- the gantry 2 is mounted so as to be movable on the second bottom surface 16.
- the stage controller 4 is accommodated in the space SP2 below the second bottom surface 16a, and the X-ray source controller 3 is accommodated in the space SP3 below the second bottom surface 16b.
- the X-ray source control device 3 and the stage control device 4 are electrically connected to an X-ray source 5 and a placement unit 6 described later by cables.
- Each part constituting the housing 1 contains lead as a material so that X-rays do not leak outside the housing 1.
- the gantry 2 is equipped with an X-ray source 5, a placement unit 6, an X-ray detector 7, and an X-ray detector drive unit 8.
- the gantry 2 is provided at each of the rectangular base bottom plate 22, the four corners on the base bottom plate 22, four columns 23 extending along the Z-axis direction, auxiliary columns 231 extending from the top of the column 23, and auxiliary It is provided with the attachment member 24 for attaching the X-ray detector drive unit 8 provided in the upper part of the column 231.
- 4 to 6 show a state in which strength is ensured by providing a reinforcing member 232 for connecting adjacent struts 23. Details of the structure of the gantry 2 will be described later.
- the X-ray source 5 is attached to the foundation bottom plate 22 of the gantry 2 and hangs from the vicinity of the center of the foundation bottom plate 22.
- the X-ray source 5 is controlled by the X-ray source control device 3 to irradiate wide-angle X-rays that expand in a conical shape in the range of the visual field VV with the point P shown in FIG. This emission point coincides with the focal spot of the X-ray source 5.
- a portion of the X-ray source 5 that hangs down from the base bottom plate 22 is accommodated in a space between the inner wall surfaces 17a and 17b facing each other.
- an axis parallel to the Z-axis direction passing through the point P is referred to as a reference axis L.
- the X-ray source 5 is provided so that the reference axis L passes through the center of the gantry 2.
- the X-ray source 5 generates at least one kind of X-ray, for example, an ultra-soft X-ray of about 50 eV, a soft X-ray of about 0.1 to 2 keV, an X-ray of about 2 to 20 keV, and a hard X-ray of about 20 to 100 keV. Irradiate.
- the X-ray source 5 may be constituted by a transmission type X-ray source or a reflection type X-ray source.
- the placement unit 6 is provided on the Z axis + side from the emission point P of the X-ray source 5, and a placement table 61 for placing the measurement object S and an X-axis movement for moving the placement table 61.
- a mechanism 62, a Y-axis moving mechanism 63, and a Z-axis moving mechanism 64 are provided (see FIG. 3).
- the X-axis moving mechanism 62 and the Y-axis moving mechanism 63 are each configured by a motor, a rail, a slider, and the like, and move the mounting table 61 along the X-axis direction and the Y-axis direction according to control by the stage control device 4.
- the Z-axis moving mechanism 64 includes a motor, rails, sliders, and the like, and moves the mounting table 61 in the Z-axis direction according to control by the stage control device 4.
- the X-ray detector 7 includes a scintillator unit including a known scintillation substance, a photomultiplier tube, a light receiving unit, and the like.
- the X-ray detector 7 emits an object to be measured S emitted from the X-ray source 5 and mounted on the mounting table 61. X-rays including the transmitted X-rays are received.
- the X-ray detector 7 converts the received X-rays into light energy, converts the light energy into electric energy, and outputs it as an electric signal. Note that the X-ray detector 7 may convert an incident X-ray into an electric signal without converting it into light energy and output the electric signal.
- the X-ray detector 7 has a plurality of pixels, and these pixels are two-dimensionally arranged. Thereby, the intensity distribution of the X-rays radiated from the X-ray source 5 and passed through the device under test S in the entire device under test S can be acquired at once. Therefore, it is possible to acquire the entire projected image of the object S to be measured with one shooting.
- the X-ray detector drive unit 8 moves the X-ray detector 7 on the rotation trajectory M around the reference axis L.
- the X-ray detector drive unit 8 includes a rotation mechanism 81 attached to the attachment member 24 of the gantry 2 and an arcuate stage 82 rotated by the rotation mechanism 81.
- the rotation mechanism 81 includes an attachment plate 811, a motor 812 attached to the attachment plate 811, a first gear 813 that is rotated by the motor 812, a second gear 814 that meshes with the first gear 813, and a hollow rotation shaft 815. have.
- the rotation shaft 815 rotates around the reference axis L by the second gear 814, the arc-shaped stage 82 fixed to the lower portion of the rotation shaft 815 rotates, and the X is provided so as to be movable on the arc-shaped stage 82.
- the line detector 7 rotates along the rotation trajectory MM around the reference axis L. Since the rotation shaft 815 has a hollow structure, cables (not shown) of the X-ray detector 7 can pass through the inside of the rotation shaft 815.
- Alignment mechanism 816 is configured by a screw or the like, and during adjustment work, a linear rod-shaped member, which is an adjustment jig, is passed through rotation shaft 815 and the lower end of the jig is made to coincide with point P. Thereby, the tilt, shift, and height of the attachment member 24 are finely adjusted so that the rotation axis of the rotation shaft 815 and the reference axis L coincide with each other.
- this alignment mechanism 816 the measurement accuracy of the measurement object S can be managed with a simple configuration in which the distance between the emission point P of the X-ray source 5 and the X-ray detector 7 can be maintained at a predetermined design value. .
- the arc-shaped stage 82 is a plate formed with a predetermined length in an arc shape centered on a point P that is an X-ray emission point.
- the arcuate stage 82 is provided with a guide rail, a slider, and the like, and the X-ray detector 7 described above is attached to be movable along the arcuate shape of the arcuate stage 82 by a motor or the like.
- the X-ray detector 7 can move along an arc-shaped trajectory M centered on the X-ray emission point P.
- the desired height (Z axis + side) is set so that the trajectory of the X-ray detector 7 is along the outline of the bottom surface of the cone having the point P as the apex. Can be adjusted so as to make a circular motion on the same plane.
- the X-ray detector 7 is configured to be movable between a plate formed in an arc shape concentric with the arc-shaped stage parallel to the arc-shaped stage 82 and the arc-shaped stage 82. Included in embodiments.
- the X-ray emission point P of the X-ray detector 7 is centered by the rotational trajectory MM centered on the reference axis L and the arc-shaped trajectory M centered on the X-ray emission point P. Therefore, the user can photograph the object S to be measured at a desired photographing position and photographing angle. In addition, by moving the mounting table 61 in the Z-axis direction, the measurement object S can be photographed at a desired magnification.
- FIG. 6 is a perspective view of the gantry 2 as seen from the bottom side
- FIG. 7 is a perspective view for explaining a mechanism for temporarily restricting movement when the gantry 2 is moved. 6 and 7, the coordinate system including the X axis, the Y axis, and the Z axis is set as shown in the same manner as in FIGS. In FIG. 6, for convenience of illustration, the X-ray detector 7 and the X-ray detector driving unit 8 are omitted.
- the X-ray detector 7 and the X-ray detector supported on the upper portion (Z axis + side) of the gantry 2 via the mounting portion 6, the column 23, and the mounting member 24.
- a drive unit 8 (not shown in FIG. 6 as described above) is provided.
- the X-ray source 5 is attached so as to hang down from an opening in the vicinity of the center of the foundation bottom board 22.
- An anti-vibration mount 25 is attached to the lower part (Z-axis-side) of the base bottom panel 22 in order to attenuate vibration applied to the gantry 2 from the outside of the housing 1 through the second bottom surface 16.
- the anti-vibration mount 25 is configured by, for example, a known air spring or coil spring alone or in combination.
- vibration isolation mounts 25a, 25b, 25c, and 25d are attached.
- Each vibration isolation mount 25 is disposed on the inner side of the outer peripheral end of the foundation bottom plate 22 of the gantry 2.
- the X-ray source 5 is positioned within a rectangular range surrounded by a straight line connecting the attachment centers of the four vibration isolation mounts 25a, 25b, 25c, and 25d to the foundation bottom plate 22.
- an example in which four vibration isolation mounts 25 are attached is shown, but the number of vibration isolation mounts 25 is not limited to four, and the size, weight, etc. of the gantry 2 are not limited. Accordingly, it is preferable that an optimum number is provided.
- the vibration isolation mount 25 includes a movable mechanism that can be displaced in all directions and a damper that attenuates the motion generated in the movable mechanism so that vibrations that are displaced in all directions can be attenuated.
- the vibration isolation mount 25 is directly or indirectly fixed to the upper mounting plate 261 constituting the moving mechanism 26 arranged on the lower side (Z axis-side), that is, the moving side.
- the lower guide rail 263 constituting the moving mechanism 26 is attached to the second bottom surface 16 of the housing 1, that is, the fixed side, and the moving mechanism 26 has the base 2 and the vibration isolation mount 25 as a base with respect to the second bottom surface 16. Move together.
- two moving mechanisms 26 are provided, one moving mechanism 26 is attached to the lower part of the vibration isolation units 25a and 25c, and the other moving mechanism 26 is attached to the lower part of the vibration isolation units 25b and 25d. It is done.
- One moving mechanism 26 is disposed on the second bottom surface 16a, and the other moving mechanism 26 is disposed on the second bottom surface 16b.
- the moving mechanism 26 includes an upper mounting plate 261, a roller unit 262 (see FIGS. 4 and 5), a lower guide rail 263, and a movement restricting mechanism 264.
- the upper mounting plate 261 of one moving mechanism 26 is attached to the lower surface of the vibration isolation mounts 25a and 25c, and the upper mounting plate 261 of the other moving mechanism 26 is attached to the lower surface of the vibration isolation mounts 25b and 25d.
- Each of the plates 261 extends along the X-axis direction.
- the plurality of roller units 262 are attached to the lower surface of the upper mounting plate 261. In this embodiment, an example in which three roller units 262a, 262b, and 262c are attached is shown.
- the roller units 262a and 262c are provided such that the central axes in the vertical direction (Z-axis direction) of the vibration isolation mounts 25a and 25c pass through the centers of the roller units 262a and 262c, respectively. That is, it is preferable that the vibration isolation units 25a and 25c are respectively disposed directly above the roller units 262a and 262c. In addition, it is not limited to what is provided so that the center axis
- the number of roller units 262 included in the moving mechanism 26 is not limited to three, and it is preferable that an optimum number is provided according to the size and weight of the gantry 2.
- the lower guide rail 263 is attached to the second bottom surface 16 of the housing 1 along the X-axis direction, and a cross section in a plane parallel to the YZ plane has a U shape with a recessed central portion. That is, the two lower guide rails 263 constituting the two moving mechanisms 26 are attached in parallel to the X axis.
- the roller unit 262 can move along the X-axis direction with respect to the gantry 2 to which the vibration isolation mount 25 is fixed by moving on the recess formed in the lower guide rail 263.
- the lower guide rail 263 is attached to a position close to the inner wall surface 17 in the second bottom surface 16 in order to suppress the bending of the second bottom surface 16 to be small. That is, the distance between the two lower guide rails 263 in the direction (Y-axis direction) perpendicular to the moving direction (X-axis direction) of the gantry 2 is shorter than the length in the width direction of the gantry 2 along the Y-axis direction. As described above, the center of the roller unit 262 that moves on the lower guide rail 263 and the center of the vibration isolation unit 25 are provided to coincide with each other.
- the distance between the mounting centers in the Y-axis direction of the vibration isolation unit 25 that supports the gantry 2 is shorter than the length of the gantry 2 in the Y-axis direction. Can be kept small.
- three movement restricting mechanisms 264a, 264b, and 264c are attached to the upper attachment plate 261 in order from the X-axis side.
- the movement restricting mechanism 264a is detachably attached to the upper mounting plate 261.
- the movement restriction mechanism 264a is provided at a position corresponding to a predetermined movement amount out of the total movement amount when the gantry 2 is pulled out of the housing 1.
- the predetermined movement amount corresponds to, for example, about 25% of the length of the gantry 2 in the X-axis direction. That is, when the gantry 2 starts moving to the X-axis side, moves a distance corresponding to 25% of the length of the gantry 2 in the X-axis direction, and a part of the gantry 2 is exposed outside the housing 1.
- the movement restriction mechanism 264a restricts the movement of the gantry 2 (see FIG. 4). At this position, a leg 9 described later is attached to the lower part of the roller unit 262a, and the weight of the gantry 2 is held by the leg 9 when the leg 9 is further moved in the X-axis direction.
- the movement restriction mechanism 264b stops the movement of the gantry 2 along the X-axis direction when the gantry 2 moves to the outside of the housing 1 along the X-axis direction, that is, the movement limit. Function as a stopper for.
- the total amount of movement of the gantry 2 corresponding to the position where the above-described movement restriction mechanism 264b is provided corresponds to, for example, 75% of the length of the gantry 2 in the X-axis direction (see FIG. 5).
- the predetermined movement amount in which the movement of the gantry 2 is regulated by the movement regulating mechanism 264a is not limited to 25% of the length of the gantry 2 in the X-axis direction.
- the predetermined movement amount may be an exposure amount that allows the leg 9 to be safely attached in a state in which the gantry 2 is partially exposed from the housing 1, and is 1 ⁇ 2 of the length of the gantry 2 in the X-axis direction. Tolerable to the extent.
- the total amount of movement is not limited to, for example, 75% of the length of the gantry 2 in the X-axis direction, and is such that there is no inconvenience when performing maintenance, inspection, maintenance, etc. of each part mounted on the gantry 2.
- the movement amount of the gantry 2 exposed from the housing 1 may be used.
- FIG. 7 is a perspective view of the moving mechanism 26 in an enlarged view of the region R surrounded by the one-dot chain line in FIG.
- the movement restricting mechanism 264a is detachably provided on the upper mounting plate 261 with screws 93 and 94.
- a limiting member 80 is attached by screws 81 and 82 to the X-axis-side end portion of the lower guide rail 263 of the moving mechanism 26.
- the movement restricting mechanism 264a also moves in the X-axis direction together with the upper mounting plate 261 of the moving mechanism 26 provided integrally with the gantry 2.
- the movement amount of the gantry 2 becomes the above-described predetermined movement amount
- the X-axis-side surface 264as of the movement restricting mechanism 264a contacts the X-axis + side surface 80s of the limiting member 80.
- the movement of the gantry 2 to the X axis-side is restricted.
- the movement restricting mechanism 264a is removed from the upper mounting plate 261 by removing the screws 93 and 94, and the upper restricting plate 261 is moved by the movement restricting mechanism 264b. It can move until it comes into contact with the limiting member 80.
- the movement restricting mechanism 264a also has a restriction in the Z-axis direction, and has a mechanism for preventing an unexpected inclination of the gantry 2 and separation from the second bottom surface 16.
- a braking member such as rubber may be attached to the movement restricting mechanism 264a for the purpose of promptly inclining and separating.
- the leg portion 9 for holding the gantry 2 when the gantry 2 is pulled out of the housing 1 will be described with reference to FIG.
- the leg portion 9 is configured in the vicinity of the roller unit 262a and attachable to the lower surface (Z-axis-side) of the upper mounting plate 261.
- a mounting base 92 provided with a screw hole for screwing to the upper mounting plate 261 is provided at the end of the leg 9 on the Z axis + side.
- wheels 91 are attached to the Z-axis-side end of the leg 9 so that the arrangement surface on which the housing 1 is arranged can be moved.
- the leg portion 9 is formed such that the length in the Z-axis direction is substantially equal to the height from the arrangement surface of the housing 1 to the lower surface of the upper mounting plate 261 so that the gantry 2 can be held. Yes. As a result, the leg portion 9 can move along the X-axis direction on the arrangement surface on which the housing 1 is arranged together with the gantry 2 while holding the gantry 2.
- the moving mechanism 26 integrally moves the gantry 2 on which the X-ray source 5 is mounted and the vibration isolation unit 25 that attenuates vibration applied to the gantry 2.
- the second bottom surface 16 is configured to support the moving mechanism 26, and the moving mechanism 26 is configured to support the gantry 2 via the vibration isolation unit 25. Accordingly, vibration from the outside of the housing 1 and vibration generated by the vibration from the outside of the housing 1 acting on the moving mechanism 26 of the gantry 2 are suppressed from being transmitted to the gantry 2 to be measured by X-rays. Since the adverse effect on the measurement result of S can be reduced, the accuracy of X-ray measurement can be improved.
- the vibration isolation unit 25 since a large moment of inertia is generated when vibration is generated in the gantry 2 on which the heavy X-ray source is mounted, it is difficult to attenuate the vibration once generated. Therefore, in the present embodiment, even when vibration that cannot be completely removed by the vibration isolation unit 25 is generated, the vibration is promoted by the moving mechanism 26 and transmitted to a heavy X-ray source. it can. Further, during maintenance such as filament replacement of the X-ray source 5, it is necessary to pull out the X-ray source 5 from the housing 1, but the moving mechanism 26 has a structure capable of pulling out the vibration isolation unit 25 together with the gantry 26. is doing.
- the vibration isolation unit 25 Since the vibration isolation unit 25 is always loaded with the same weight when the gantry 2 is pulled out of the housing 1, the vibration isolation unit 25 is caused by a load change to the vibration isolation unit 25 due to a load change to the vibration isolation unit 25. It is possible to prevent the 25 from being lifted and facilitate maintenance.
- the plurality of roller units 262 constituting the moving mechanism 26 are provided closer to the gantry 2 side than the lower guide rail 263, and the central axes in the vertical direction of the plurality of vibration isolation units 25 are the centers of the roller units 262. It was made to correspond substantially. Therefore, the vibration caused by the structure of the moving mechanism 26 and the like can be attenuated by the vibration isolation unit 25 provided immediately above the moving mechanism 26, so that the vibration isolation effect is improved and the measurement accuracy of the measurement object S is improved. Can be improved. Further, since the weight of the gantry 2 acts on the lower guide rail 263 and the second bottom surface 16 via the roller unit 262 provided directly below the vibration isolation unit 25, the roller unit 262 is provided directly below the vibration isolation unit 25. Compared with the case where it is not, the generation
- the X-ray source 5 is mounted within a range of the gantry 2 formed by connecting positions where a plurality of vibration isolation units 25 are attached to the gantry 2. It was made to be provided inside the lower edge of the lower surface of 22. As a result, since the X-ray source 5 having a high resonance frequency and a large weight is supported, vibrations in a wide area can be isolated by the vibration isolation unit 25, and the measurement result of the measurement object S by X-rays is adversely affected. Can be suppressed.
- Two lower guide rails 263 are arranged in parallel to the X-axis direction, which is the moving direction in which the gantry 2 moves, and the distance (interval) in the Y-axis direction between the two lower guide rails 263 is the moving direction. It was made to become shorter than the dimension of the mount frame 2 in the Y-axis direction which is a direction orthogonal to. As described above, the center of the roller unit 262 that moves on the lower guide rail 263 and the center of the vibration isolation unit 25 are provided to coincide with each other. For this reason, the distance between the mounting centers in the Y-axis direction of the vibration isolation unit 25 that supports the gantry 2 is shorter than the length of the gantry 2 in the Y-axis direction. Therefore, it is possible to reduce the bending and vibration generated in the base bottom plate 22 of the gantry 2.
- the leg 9 for supporting the gantry 2 can be mounted.
- the leg portion 9 can be mounted below the roller unit 262 installed below the vibration isolation unit 25. Accordingly, when the gantry 2 is pulled out from the housing 1, the weight of the gantry 2 can be supported by the legs 9 via the vibration isolation unit 25 and the roller unit 262. Even if it is the case where it exposes above, generation
- the movement mechanism 26 is a movement restriction mechanism 264 that temporarily restricts the movement of the gantry 2 at a position corresponding to a predetermined movement amount of the total movable amount of the gantry 2 when the leg portion 9 is mounted. It was made to have. Therefore, it is possible to prevent the gantry 2 from moving freely along the X-axis direction due to external vibration or the like during the mounting operation of the leg portion 9, thereby contributing to improvement in work safety.
- the X-ray source 5, the mounting portion 6, the X-ray detector 7, and the X-ray detector drive unit 8 are mounted on the gantry 2 along the Z-axis direction.
- the X-ray source 5 depends from the foundation bottom 22 of the gantry 2.
- spaces SP2 and SP3 are generated on the lower surface (Z-axis-side) of the gantry 2. Since the X-ray source control device 3 and the stage control device 4 that are conventionally arranged outside the casing can be arranged in the spaces SP2 and SP3, the installation surface of the casing 1 is compared with the conventional apparatus. The installation area can be reduced.
- an image processing device 41 connected to the X-ray detector 7, an image processing device 41, and a reconstruction processing device 42 connected to the stage control device 4 are installed. (Refer to FIGS. 2, 4, and 5), and even if a CT apparatus is used, it is not necessary to greatly increase the installation area.
- the guide rail may be attached to the vibration isolation unit 25 side
- the attachment plate may be attached to the second bottom surface 16
- the roller unit 262 may be attached to the attachment plate.
- the roller unit 262 is attached to the mounting plate so that the central axis in the vertical direction (Z-axis direction) of the vibration isolation unit 25 passes through the roller unit 262 in a state where the entire gantry 2 is accommodated in the housing 1. It only has to be done.
- the leg 9 instead of the leg 9 that can be mounted, the leg 9 may have a folding structure and can be accommodated on the lower surface of the foundation bottom board 22.
- the X-ray moving mechanism 62, the Y-axis moving mechanism 63, the Z-axis moving mechanism 64, the rotating mechanism 81 and the X-ray detector 7 for transferring the X-ray detector 7 on the arcuate stage 82 are encoders.
- the position information of the placement unit 6 and the X-ray detector 7 can be acquired.
- the cross-sectional structure of the measurement object S can be reconstructed by acquiring projection image data that is an X-ray transmission image captured by the X-ray detector 7 while acquiring each position information.
- the stage control device 4 controls the rotating shaft 815 and performs coordinated control of the X-ray detector 7 and the X-ray detector driving unit 8 by an image processing unit (not shown).
- the reconstruction processing apparatus 42 projects the measurement object S from a plurality of different directions captured by the X-ray detector 7 via the image processing apparatus 41. Get image data.
- the reconstruction processing device 42 also acquires outputs from the encoders via the stage control device 4. Then, the reconstruction processing device 42 may calculate the internal structure of the object S to be measured by a known Feldkamp backprojection method based on the projection image data and the output of each encoder.
- the present invention is not limited to the above-described embodiments, and other forms conceivable within the scope of the technical idea of the present invention are also included in the scope of the present invention. .
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Abstract
Description
本発明の第2の態様によると、第1の態様によるX線装置において、架台は、被測定物を搭載する載置台と、X線源から照射され被測定物を透過したX線を検出するX線検出器と、をさらに搭載することが好ましい。
本発明の第3の態様によると、第2の態様によるX線装置において、移動機構を支持する基盤をさらに有し、移動機構は除振機構を介して架台を支持するように構成されることが好ましい。
本発明の第4の態様によると、第3の態様によるX線装置において、移動機構は、案内レールと、案内レールに沿って相対的に移動する複数の移動部材とを有し、除振機構の鉛直方向の下方に移動部材が位置していることが好ましい。
本発明の第5の態様によると、第4の態様によるX線装置において、移動機構は、移動部材の下方に、架台を支持するための脚部を装着可能な構造を有することが好ましい。
本発明の第6の態様によると、第5の態様によるX線装置において、移動機構は、脚部を装着する際に、架台の全移動可能量のうちの所定の移動量となる位置で、架台の移動を一時的に規制する規制部材を有することが好ましい。
本発明の第7の態様によると、第4の態様によるX線装置において、架台が収納される筐体を備え、基盤は前記筐体の一部を構成し、所定の移動量となる位置において、架台の少なくとも一部が筐体から露出することが好ましい。
本発明の第8の態様によると、第1乃至第7の何れか一つの態様によるX線装置において、除振機構は、架台の下面外縁部よりも架台の下面内側に設けられることが好ましい。
本発明の第9の態様によると、第2乃至第8の何れか一つの態様によるX線装置において、X線検出器と被測定物との相対位置を変えながら、複数の異なる方向からX線が被測定物を透過したときの被測定物の投影画像に基づいて、被測定物の内部構造を算出する再構成部を備えることが好ましい。
図面を参照しながら、本発明の一実施の形態によるX線装置について説明する。X線装置は、被測定物にX線を照射して、被測定物を透過した透過X線を検出することにより、被測定物の内部情報(たとえば内部構造)等を非破壊で取得するX線CT検査装置である。被測定物が、たとえば機械部品や電子部品等の産業用部品が対象である場合、X線装置は産業用X線CT検査装置と呼ばれる。
また、本実施の形態は、発明の趣旨の理解のために具体的に説明するためのものであり、特にX線指定の無い限り、本発明を限定するものではない。
上述した構成を備えることにより、基準軸Lを中心とした回転軌道MMとX線の出射点Pを中心とする円弧状軌道Mにより、X線検出器7のX線の出射点Pを中心とする球面上の任意の場所に移動させることができるので、ユーザは所望する撮影位置、撮影角度にて被測定物Sを撮影することができる。また、載置台61をZ軸方向に移動させることにより、所望の拡大率にて被測定物Sを撮影することができる。
また、移動規制機構264aはZ軸方向にも制限を持ち、架台2の予期せぬ傾きや第2底面16からの離間を防止する機構も有する。傾きや離間停止を速やかに行う目的で移動規制機構264aにゴム等の制動部材を取り付けてもよい。
(1)移動機構26は、X線源5が搭載された架台2と、架台2に加わる振動を減衰させる除振ユニット25とを一体に移動させるようにした。具体的には、第2底面16は移動機構26を支持するように構成され、移動機構26は除振ユニット25を介して架台2を支持するように構成した。したがって、筐体1の外部からの振動や、筐体1の外部からの振動が架台2の移動機構26に作用して生じる振動が架台2に伝達されることを抑制しX線による被測定物Sの測定結果に及ぼす悪影響を低減できるので、X線測定の精度を向上させることができる。特に、重量の重いX線源を搭載する架台2に振動が発生すると大きな慣性モーメントが生じるので、一度生じた振動を減衰させることには困難が伴う。そのため、本実施の形態では、除振ユニット25で除振しきれなかった振動が生じた場合であっても、移動機構26などで振動が助長されて、重いX線源に伝達することを防止できる。また、X線源5のフィラメント交換などのメンテナンス時には、X線源5を筐体1から引き出す必要が出てくるが、移動機構26は架台26とともに除振ユニット25も引き出すことができる構造を有している。除振ユニット25は、架台2を筐体1から引き出す際にも常に同じ重量が荷重されているので、除振ユニット25への荷重変化による除振ユニット25への荷重変化に起因した除振ユニット25の浮き上がりを防止し、保守整備を容易にすることが可能となる。
また、ステージ制御装置4を配置した空間SP2には、X線検出器7に接続された画像処理装置41や画像処理装置41およびステージ制御装置4に接続された再構成処理装置42を設置することも可能であり(図2、図4、図5参照)、さらにCT装置化しても設置面積を大幅に増やす必要がなくなる。
(1)ガイドレールを除振ユニット25側に取り付け、取付板を第2底面16に取り付け、ローラユニット262を取付板に取り付けてもよい。この場合、架台2の全体が筐体1に収容されている状態で除振ユニット25の鉛直方向(Z軸方向)の中心軸がローラユニット262を通過するようにローラユニット262が取付板に取り付けられていればよい。
(2)脚部9が装着可能なものに代えて、脚部9を折りたたみ構造とし、基礎底盤22の下面に収容可能な構成としてもよい。
9…脚部、16、16a、16b…第2底面、22…基礎底盤、
25…除振ユニット、26…移動機構、41…画像処理装置、
42…再構成処理装置、61…載置台、62…X軸移動機構、
63…Y軸移動機構、64…Z軸移動機構、261…上部取付板、
262…ローラユニット、263…下部ガイドレール、264…移動規制機構
Claims (9)
- 被測定物にX線を照射するX線源と、
前記X線源が搭載された架台と、
前記架台に加わる振動を減衰させる除振機構と、
前記架台と前記除振機構とを一体に移動させる移動機構と、を備えるX線装置。 - 請求項1に記載のX線装置において、
前記架台は、
前記被測定物を搭載する載置台と、
前記X線源から照射され前記被測定物を透過した前記X線を検出するX線検出器と、をさらに搭載するX線装置。 - 請求項2に記載のX線装置において、
前記移動機構を支持する基盤をさらに有し、
前記移動機構は前記除振機構を介して前記架台を支持するように構成されるX線装置。 - 請求項3に記載のX線装置において、
前記移動機構は、
案内レールと、
前記案内レールに沿って相対的に移動する複数の移動部材とを有し、
前記除振機構の鉛直方向の下方に前記移動部材が位置しているX線装置。 - 請求項4に記載のX線装置において、
前記移動機構は、前記移動部材の下方に、前記架台を支持するための脚部を装着可能な構造を有するX線装置。 - 請求項5に記載のX線装置において、
前記移動機構は、前記脚部を装着する際に、前記架台の全移動可能量のうちの所定の移動量となる位置で、前記架台の移動を一時的に規制する規制部材を有するX線装置。 - 請求項4に記載のX線装置において、
前記架台が収納される筐体を備え、
前記基盤は前記筐体の一部を構成し、
所定の移動量となる位置において、前記架台の少なくとも一部が前記筐体から露出するX線装置。 - 請求項1乃至7の何れか一項に記載のX線装置において、
前記除振機構は、前記架台の下面外縁部よりも前記架台の下面内側に設けられるX線装置。 - 請求項2乃至8の何れか一項に記載のX線装置において、
前記X線検出器と前記被測定物との相対位置を変えながら、複数の異なる方向から前記X線が前記被測定物を透過したときの前記被測定物の投影画像に基づいて、前記被測定物の内部構造を算出する再構成部を備えるX線装置。
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PCT/JP2013/083371 WO2015087432A1 (ja) | 2013-12-12 | 2013-12-12 | X線装置 |
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