公开(公告)号：US10102631B2

公开(公告)日：2018-10-16

申请号：US15085027

申请日：2016-03-30

Applicant: MITUTOYO CORPORATION

Inventor： Hiroyuki Yoshida ,  Akira Takada ,  Makoto Kaieda ,  Gyokubu Cho ,  Koichi Komatsu ,  Hidemitsu Asano ,  Takashi Hanamura ,  Takuho Maeda ,  Isao Tokuhara

IPC: G06T1/00 ,  G06T7/00 ,  H04N5/14 ,  G01B11/02

Abstract: A distance in a scanning direction between a first set of edges which face each other and exhibit an opposite change between light and dark is measured by an image measuring machine, and a bias correction value is calculated based on a difference between a measured value and a true value. Using the bias correction value, detection point correction values, which are correction values in various directions of edge detection points detected by a scan of a measured object using the image measuring machine, are calculated; a correction amount used in correction of the edge detection points is specified based on the detection point correction value in each direction; and the edge detection points are corrected using the correction amount.

公开(公告)号：US11510643B2

公开(公告)日：2022-11-29

申请号：US17024061

申请日：2020-09-17

Applicant: MITUTOYO CORPORATION

Inventor： Hidemitsu Asano ,  Masato Kon

IPC: A61B6/00 ,  A61B6/03 ,  A61B6/04

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：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：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：US11041818B2

公开(公告)日：2021-06-22

申请号：US16661206

申请日：2019-10-23

Applicant: MITUTOYO CORPORATION

Inventor： Yusuke Goto ,  Hidemitsu Asano

IPC: G01N23/046

Abstract: A dimensional X-ray computed tomography system configured to obtain projection images by irradiating an object to be measured disposed between an X-ray source and an X-ray detector with X-rays for CT scan, and generate a three-dimensional image of the object to be measured by performing CT reconstruction on the projection images, includes a fixed table on which the object to be measured is placed, and a movable X-ray source and a movable X-ray detector that are capable of moving around the fixed table with the fixed table therebetween.

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.

公开(公告)号：US10753887B2

公开(公告)日：2020-08-25

申请号：US16250167

申请日：2019-01-17

Applicant: MITUTOYO CORPORATION

Inventor： Kozo Ariga ,  Gyokubu Cho ,  Hidemitsu Asano ,  Masato Kon

IPC: G01N23/046

Abstract: An X-ray CT measuring apparatus configured to emit an X-ray from an X-ray source while rotating a subject arranged on a rotary table, and obtain a tomographic image of the subject by reconstructing projection images, includes an imaging unit for imaging the subject on the rotary table from above or sideways, an obtaining unit for obtaining an image of the subject while rotating the subject, a calculating unit for calculating a maximum outer diameter of the subject during rotation by using the obtained image of the subject, and a setting unit for setting a movement limit of the rotary table on the basis of the maximum outer diameter.

公开(公告)号：US11234670B2

公开(公告)日：2022-02-01

申请号：US16291674

申请日：2019-03-04

Applicant: MITUTOYO CORPORATION

Inventor： Sadayuki Matsumiya ,  Hidemitsu Asano ,  Masato Kon

IPC: G06K9/00 ,  A61B6/00 ,  G01N23/046 ,  G06T11/00 ,  A61B6/03

Abstract: When generating a tomographic image using a measuring X-ray CT apparatus that is configured to emit X-rays while rotating a specimen that is arranged on a rotary table and reconstruct a projection image thereof to generate a tomographic image of the specimen, an amount of geometric error that is included in the projection image is obtained in advance and stored; the projection image is corrected using the stored amount of geometric error; and a tomographic image is reconstructed using the corrected projection image.

公开(公告)号：US11037337B2

公开(公告)日：2021-06-15

申请号：US16299513

申请日：2019-03-12

Applicant: MITUTOYO CORPORATION

Inventor： Kozo Ariga ,  Gyokubu Cho ,  Hidemitsu Asano ,  Masato Kon

IPC: A61B6/00 ,  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：US20190227004A1

公开(公告)日：2019-07-25

申请号：US16250167

申请日：2019-01-17

Applicant: Mitutoyo Corporation

Inventor： Kozo ARIGA ,  Gyokubu Cho ,  Hidemitsu Asano ,  Masato Kon

IPC: G01N23/046

Abstract: An X-ray CT measuring apparatus configured to emit an X-ray from an X-ray source while rotating a subject arranged on a rotary table, and obtain a tomographic image of the subject by reconstructing projection images, includes an imaging unit for imaging the subject on the rotary table from above or sideways, an obtaining unit for obtaining an image of the subject while rotating the subject, a calculating unit for calculating a maximum outer diameter of the subject during rotation by using the obtained image of the subject, and a setting unit for setting a movement limit of the rotary table on the basis of the maximum outer diameter.