公开(公告)号：US11344276B2

公开(公告)日：2022-05-31

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 ,  A61B6/03 ,  A61B6/04

Abstract: A calibration method of an X-ray measuring device includes: mounting a calibration tool 102 on a rotating table 120; a moving position acquisition step of parallelly moving a position of an j-th sphere 106 with respect to a position of a first sphere 106, irradiating the calibration tool 102 with an X-ray 118, and acquiring, form an output of an X-ray image detector 124, a moving position Mj where the magnitude of a differential position Erjofa centroid position ImDisjh_Sphr_j of a projected image of the j(2£j£N)-th sphere 106 with respect to a centroid position ImDis1_Sphr_1 of a projected image of the first sphere 106 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：US11333619B2

公开(公告)日：2022-05-17

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: G01N23/00 ,  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：US11573190B2

公开(公告)日：2023-02-07

申请号：US17360304

申请日：2021-06-28

Applicant: MITUTOYO CORPORATION

Inventor： Masato Kon ,  Hiromu Maie ,  Seiji Sasaki ,  Jyota Miyakura

IPC: G01N23/083 ,  G01N23/18

Abstract: A calibration method for an X-ray measuring device includes mounting a calibration tool on a rotating table, identifying centroid positions from an output of an X-ray image detector, calculating projection transformation matrixes from the centroid positions and known relative positional intervals, repeating to identify the centroid positions from the output of the X-ray image detector and to calculate the projection transformation matrixes from the centroid positions and known relative positional intervals while the rotating table is rotated twice or more by a predetermined angle, and calculating a rotation center position of the rotating table on the basis of the projection transformation matrixes. The calibration method thereby allows easy calculation of the rotation center position of the rotating table on which an object to be measured is mounted in a rotatable manner, with the simple process.

公开(公告)号：US11262319B2

公开(公告)日：2022-03-01

申请号：US16291699

申请日：2019-03-04

Applicant: MITUTOYO CORPORATION

Inventor： Hidemitsu Asano ,  Masato Kon

IPC: G06K9/00 ,  G01N23/083 ,  G01N23/046 ,  G06T15/08 ,  G06T7/00

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：US10343334B2

公开(公告)日：2019-07-09

申请号：US15188339

申请日：2016-06-21

Applicant: MITUTOYO CORPORATION

Inventor： Gyokubu Cho ,  Hidemitsu Asano ,  Masato Kon

IPC: B29C67/00 ,  B29C64/386 ,  B29C64/106 ,  B33Y30/00 ,  B33Y50/02 ,  G06T7/13 ,  B29C64/393 ,  G06T7/62 ,  B29C64/20 ,  G06T7/00 ,  G05B19/418

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.