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公开(公告)号：US11193757B2
公开(公告)日：2021-12-07
申请号：US16717320
申请日：2019-12-17
Applicant: MITUTOYO CORPORATION
Inventor： Satoru Yoshida , Tatsuya Nagahama , Masafumi Yamanaka , Hitoshi Isobe , Naoto Oita , Koji Kubo , Yuko Shishido , Nobuo Ohba , Takahisa Ootake , Hiroki Matsui , Masanori Arai , Shiro Igasaki , Yuki Kurahashi , Hiroshi Sakai , Yutaka Watanabe
Abstract: An image measurement apparatus, which functions as a non-contact profile-measuring device, includes: an image sensor as an image pick-up device; a variable focal length lens (liquid lens unit) disposed on an optical axis extending from a workpiece to the image sensor; and a controller (image-pickup lens controller and image measurement processor) configured to control the variable focal length lens and process a detected image by the image sensor. The image measurement apparatus, which also functions as a non-contact displacement-detecting device, includes: an image sensor; a variable focal length lens (liquid lens unit) disposed on an optical axis extending from the workpiece to the image sensor; and a controller (displacement-detection lens controller and profile measurement processor) configured to control the variable focal length lens and a detected image by the image sensor.
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公开(公告)号：US10986263B2
公开(公告)日：2021-04-20
申请号：US16414148
申请日：2019-05-16
Applicant: MITUTOYO CORPORATION
Inventor： Hiroshi Sakai , Yutaka Watanabe
Abstract: A calibration method of a variable-focal-length lens including a liquid lens unit whose focal-length is periodically varied in response to a periodic drive-signal includes: using a calibration tool having a plurality of height-different parts on a surface; preparing a calibration table by repeating outputting a drive-signal having a predetermined voltage to the variable-focal-length lens, detecting a surface image of the calibration tool using an image detector, detecting two points having maximum image contrast in the surface image, calculating a focal-depth from a difference in a focal-length between the two points; and recording the focal-depth and the voltage of the drive-signal in a corresponding combination, and retrieving a value of the voltage corresponding to a desired focal-depth from the calibration table to set the variable-focal-length lens at the desired focal-depth, and adjusting the voltage of the drive-signal outputted to the variable-focal-length lens based on the retrieved value.
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Patent Agency Ranking
公开(公告)号：US10274313B2
公开(公告)日：2019-04-30
申请号：US15440118
申请日：2017-02-23
Applicant: MITUTOYO CORPORATION
Inventor： Hiroshi Sakai , Yutaka Watanabe , Yasuhiro Takahama , Harumasa Ito , Yuji Kudo
Abstract: According to an embodiment of the present invention, a method of measuring a surface of an object having a curved shape by measuring a distance from a measurement head to the object, includes: setting a measuring region of the object and a threshold value of concave and convex; acquiring shape reference data including the curved shape of the object; acquiring three-dimensional data of the surface of the object by measuring the distance between the object in the measuring region and the measurement head; acquiring curve removed data by removing the shape reference data from the three-dimensional data; calculating second reference data by calculating first reference data based on the curve removed data, by removing data exceeding the threshold value with respect to the first reference data, from the curve removed data, and by averaging the curve removed data; and calculating shape data of the concave and convex.
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公开(公告)号：US20170330340A1
公开(公告)日：2017-11-16
申请号：US15498577
申请日：2017-04-27
Applicant: MITUTOYO CORPORATION
Inventor： Yutaka Watanabe , Hiraku Ishiyama
CPC classification number: G06T7/571 , G06T3/4007 , G06T7/30 , G06T7/521 , G06T7/536 , G06T7/557 , G06T2207/10004 , G06T2207/10028 , G06T2207/10056 , G06T2207/20221
Abstract: A non-contact 3D measuring system is configured to provide a combined three-dimensional shape of an object to be imaged based on a frame image, which has been captured by a camera while a measuring head is being scanned in an optical axis (Z-axis) direction, and the information on the position at which the image has been acquired. The system includes: a position detector for detecting a scanning position of the measuring head while a plurality of raw images are captured; and a computer for generating an interpolation image by linear interpolation for the captured raw image using the information of the scanning position as well as generating a combined frame image using the interpolation image.
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公开(公告)号：US11215788B2
公开(公告)日：2022-01-04
申请号：US16415190
申请日：2019-05-17
Applicant: MITUTOYO CORPORATION
Inventor： Hiroshi Sakai , Yutaka Watanabe , Gyokubu Cho
Abstract: A variable focal length lens device includes: a lens system whose refractive index changes in accordance with a drive signal to be inputted; an objective lens disposed on the same optical axis as the lens system; an image detector configured to detect an image of a measurement target through the lens system and the objective lens: a resonance-lock controller configured to tune the drive signal to a resonance frequency of the lens system; and a resonance-lock delay controller configured to divide a change in a frequency of the drive signal by a change amount set by the resonance-lock controller to step-by-step changes for n times by a preset reference value to delay the change in the frequency of the drive signal.
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公开(公告)号：US10816755B2
公开(公告)日：2020-10-27
申请号：US15951599
申请日：2018-04-12
Applicant: MITUTOYO CORPORATION
Inventor： Hiroshi Sakai , Yutaka Watanabe
Abstract: A variable focal length lens device includes: a lens system whose refractive index is variable in response to an inputted drive signal; an image detector for detecting an image of a target object through the lens system; a lens controller for outputting the drive signal and an illumination signal; and a lens operation unit for adjusting a frequency and amplitude of the drive signal outputted by the lens controller and an image-detection timing for the image detector. The lens controller includes a resonance-lock controller for tuning the drive signal to a resonance frequency of the lens system. The lens operation unit includes a resonance-lock operation unit for switchably enabling and suspending the resonance-lock controller.
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公开(公告)号：US10445894B2
公开(公告)日：2019-10-15
申请号：US15498577
申请日：2017-04-27
Applicant: MITUTOYO CORPORATION
Inventor： Yutaka Watanabe , Hiraku Ishiyama
Abstract: A non-contact 3D measuring system is configured to provide a combined three-dimensional shape of an object to be imaged based on a frame image, which has been captured by a camera while a measuring head is being scanned in an optical axis (Z-axis) direction, and the information on the position at which the image has been acquired. The system includes: a position detector for detecting a scanning position of the measuring head while a plurality of raw images are captured; and a computer for generating an interpolation image by linear interpolation for the captured raw image using the information of the scanning position as well as generating a combined frame image using the interpolation image.
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