公开(公告)号：US20210072168A1

公开(公告)日：2021-03-11

申请号：US17011411

申请日：2020-09-03

Applicant: MITUTOYO CORPORATION

Inventor： Seiji SASAKI ,  Nobuyuki NAKAZAWA ,  Hisayoshi SAKAI ,  Masato KON ,  Hidemitsu ASANO

IPC: G01N23/046 ,  G06T7/00

Abstract: A measurement X-ray CT apparatus calibrates a geometrical positional relationship between a focus of an X-ray source, an X-ray detector, and a rotation center of a rotating table in advance. The measurement X-ray CT apparatus then obtains projection images by irradiating the object to be measured with X-rays to perform a CT scan, and generates a three-dimensional image of the object to be measured by CT reconstruction of the projection images. The measurement X-ray CT apparatus further includes a reference frame that is made of a material and has a structure less susceptible to environmental changes, and sensors that are located on the reference frame and intended to successively obtain calibration values of the geometrical positional relationship between the focus of the X-ray source and the X-ray detector during the CT scan. The calibration values are used as parameters of the CT reconstruction.

公开(公告)号：US20210072022A1

公开(公告)日：2021-03-11

申请号：US17014308

申请日：2020-09-08

Applicant: MITUTOYO CORPORATION

Inventor： Masato KON ,  Hiromu MAIE ,  Seiji SASAKI ,  Jyota MIYAKURA

IPC: G01B15/04

Abstract: A calibration method of an X-ray measuring device includes: a front-stage feature position calculation step of parallelly moving spheres disposed in N places a plurality of times, and identifying centroid positions ImPos(1 to Q)_Dis(1 to M)_Sphr_(1 to N) of projected images of the spheres in the N places; an individual matrix calculation step of calculating an individual projection matrix PPj (j=1 to Q) for each of the spheres; an individual position calculation step of calculating moving positions Xb of the spheres on the basis of the individual projection matrix PPj (j=1 to Q); a coordinate integration step of calculating specific relative position intervals X(1 to N) of the spheres; a rear-stage feature position calculation step; a transformation matrix calculation step of calculating a projective transformation matrix Hk (k=1 to Q); a rotation detection step; a position calculation step; and a center position calculation step.

公开(公告)号：US20200011662A1

公开(公告)日：2020-01-09

申请号：US16455883

申请日：2019-06-28

Applicant: THE UNIVERSITY OF TOKYO ,  MITUTOYO CORPORATION

Inventor： Yutaka OHTAKE ,  Tasuku ITO ,  Tomonori GOTO ,  Masato KON

IPC: G01B15/02 ,  G01N23/046

Abstract: In measuring a dimension of an object to be measured W made of a single material, a plurality of transmission images of the object to be measured W are obtained by using an X-ray CT apparatus, and then respective projection images are generated. The projection images are registered with CAD data used in designing the object to be measured W. The dimension of the object to be measured W is calculated by using a relationship between the registered CAD data and projection images. In such a manner, high-precision dimension measurement is achieved by using several tens of projection images and design information without performing CT reconstruction.

公开(公告)号：US20190287274A1

公开(公告)日：2019-09-19

申请号：US16299513

申请日：2019-03-12

Applicant: MITUTOYO CORPORATION

Inventor： Kozo ARIGA ,  Gyokubu CHO ,  Hidemitsu ASANO ,  Masato KON

IPC: G06T11/00 ,  G01N23/046

Abstract: When generating a measurement plan for measuring X-ray CT that performs X-ray irradiation while rotating a test object, and in doing so acquires projection image data, reconstructs volume data from the projection image data, and measures a targeted measurement location in the volume data, the present invention calculates required measurement accuracy and a measurement field of view range based on tolerance information included in CAD data of the test object and a measurement location on the test object defined by a measurement operator ahead of time, and automatically generates, from this information, an optimized measurement plan that minimizes the number of measurements.

公开(公告)号：US20160375640A1

公开(公告)日：2016-12-29

申请号：US15188339

申请日：2016-06-21

Applicant: MITUTOYO CORPORATION

Inventor： Gyokubu CHO ,  Hidemitsu ASANO ,  Masato KON

IPC: B29C67/00 ,  B33Y50/02 ,  B33Y30/00

CPC classification number: B29C64/386 ,  B29C64/106 ,  B29C64/20 ,  B29C64/393 ,  B33Y30/00 ,  B33Y50/02 ,  G05B19/41875 ,  G06T7/0004 ,  G06T7/13 ,  G06T7/62

Abstract: A 3D printer includes: an object-forming unit for forming an object by laminating an object material at an object-forming point based on a design data; an image capturing unit for capturing an image of the object formed by the object-forming unit; and a shape measurement unit for measuring a cross section of the object based on the image captured by the image capturing unit while the object is under formation by the object-forming unit.

Abstract translation: 3D打印机包括：物体形成单元，用于基于设计数据在物体形成点处层压物体材料来形成物体; 图像拍摄单元，用于捕获由对象形成单元形成的对象的图像; 以及形状测量单元，用于当物体形成单元在形成对象时，基于由图像捕获单元捕获的图像来测量物体的横截面。

公开(公告)号：US20210085279A1

公开(公告)日：2021-03-25

申请号：US17024061

申请日：2020-09-17

Applicant: MITUTOYO CORPORATION

Inventor： Hidemitsu ASANO ,  Masato KON

IPC: A61B6/00 ,  A61B6/04 ,  A61B6/03

Abstract: Volume data is generated by performing a CT scan with a spherical calibration jig having known dimensions in contact with an object. A profile of the surface shape of the object in the volume data is obtained, and a boundary surface of the spherical calibration jig is calculated from the center coordinates of the spherical calibration jig. A correction value for adjusting a boundary surface of the object determined from the gradient of the profile to the boundary surface of the spherical calibration jig is determined, and the boundary surface of the object is corrected by using the correction value. The shape of the object is determined by using the corrected boundary surface. The precision of measurement X-ray CT can thus be increased by accurately detecting the boundary surface of the object.

公开(公告)号：US20210068777A1

公开(公告)日：2021-03-11

申请号：US17015618

申请日：2020-09-09

Applicant: MITUTOYO CORPORATION

Inventor： Masato KON ,  Hiromu MAIE ,  Seiji SASAKI ,  Jyota MIYAKURA

IPC: A61B6/00 ,  A61B6/04 ,  A61B6/03

Abstract: A calibration method of an X-ray measuring device includes: mounting a calibration tool on a rotating table; a moving position acquisition step of parallelly moving a position of an j-th sphere with respect to a position of a first sphere, irradiating the calibration tool with an X-ray, and acquiring, form an output of an X-ray image detector, a moving position Mj where the magnitude of a differential position Erj of a centroid position ImDisjh_Sphr_j of a projected image of the j(2≤j≤N)-th sphere with respect to a centroid position ImDis1_Sphr_1 of a projected image of the first sphere becomes equal to or less than a specified value Vx; a relative position calculation step of performing the moving position acquisition step on the remaining spheres a feature position calculation step; a transformation matrix calculation step; a rotation detection step; a position calculation step; and a center position calculation step.

公开(公告)号：US20200175758A1

公开(公告)日：2020-06-04

申请号：US16676943

申请日：2019-11-07

Applicant: THE UNIVERSITY OF TOKYO ,  MITUTOYO CORPORATION

Inventor： Yutaka OHTAKE ,  Yukie NAGAI ,  Tomonori GOTO ,  Seiji SASAKI ,  Masato KON

IPC: G06T17/20

Abstract: An isosurface mesh M is generated by extracting voxels having a certain CT value from volume data obtained by X-ray CT. A gradient vector g of a CT value is calculated at each vertex p of the isosurface mesh M. A plurality of sample points S are generated in positive and negative directions of the calculated gradient vector g. Gradient norms N of CT values at the respective generated sample points S are calculated. The vertex p of the isosurface mesh is moved and corrected to a sample point Sm having the maximum norm Nm calculated.

公开(公告)号：US20190277780A1

公开(公告)日：2019-09-12

申请号：US16291699

申请日：2019-03-04

Applicant: MITUTOYO CORPORATION

Inventor： Hidemitsu ASANO ,  Masato KON

IPC: G01N23/083 ,  G01N23/046

Abstract: When measuring a mass-produced work piece using a measuring X-ray CT apparatus, which is configured to emit X-rays while rotating a work piece that is arranged on a rotary table and to reconstruct a projection image thereof to generate volume data of the work piece, the present invention assigns values to volume data for a predetermined work piece and stores the same as master data; obtains volume data for a mass-produced work piece under identical conditions to the predetermined work piece; measures the volume data and obtains an X-ray CT measured value for the mass-produced work piece; and corrects the X-ray CT measured value for the mass-produced work piece using the master data.

公开(公告)号：US20160305894A1

公开(公告)日：2016-10-20

申请号：US15093134

申请日：2016-04-07

Applicant: MITUTOYO CORPORATION

Inventor： Sadayuki MATSUMIYA ,  Hidemitsu ASANO ,  Masato KON

IPC: G01N23/04

CPC classification number: G01N23/046 ,  G01N2223/309 ,  G01N2223/3306 ,  G01N2223/3308

Abstract: An XY shift mechanism can shift a rotary table in a two-dimensional direction (XY direction) orthogonal to a rotation axis of the rotary table. By collaborative control of the shift position of the rotary table in the two-dimensional direction in synchronization with the rotation of the rotary table, rotation is made possible about a virtual rotation center that is set at an arbitrary position on the rotary table. The collaborative control of the shift position of the rotary table in the two-dimensional direction also corrects rotation eccentricity owing to the eccentricity of the rotary table. Thus, the virtual rotation center can be set at an arbitrary position on the rotary table, thus enabling obtainment of high resolution tomographic images of a plurality of regions of interest of an object, without the need for repositioning of the object.

Abstract translation: XY移动机构可以使与旋转台的旋转轴正交的二维方向（XY方向）的旋转台移动。 通过与旋转台的旋转同步地与二维方向的旋转台的换档位置协同控制，可以围绕设置在旋转台上的任意位置的虚拟旋转中心进行旋转。 旋转台在二维方向的换档位置的协同控制也由于旋转台的偏心而校正旋转偏心。 因此，可以将虚拟旋转中心设置在旋转台上的任意位置，从而能够获得对象的多个感兴趣区域的高分辨率断层图像，而不需要重新定位对象。