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公开(公告)号：US10189133B2
公开(公告)日：2019-01-29
申请号：US15388496
申请日：2016-12-22
Inventor： Yi-Yuh Hwang , Wei-Guo Chang , Li-Chung Liu
IPC: B23Q11/00 , B23Q17/24 , G01B11/00 , G05B19/402
Abstract: A measurement, calibration and compensation system for machine tool includes a first positioning base; two first speckle image sensors for sensing speckle positions of an object holding unit at a first XY plane and a first XZ plane of the first positioning base before and after the machine tool is started for machining; a second positioning base; two second speckle image sensors for sensing speckle positions of a cutter holding unit at a second XY plane and a second YZ plane of the second positioning base before and after the machine tool is started for machining. Thus, the thermal expansion at all axes of the machine tool can be measured in a simplified and low-cost way, and the absolute positioning coordinates of all axes of the machine tool can be calibrated in real time to avoid reduced positioning accuracy due to the thermal expansion of the multi-axis machine tool.
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公开(公告)号：US09671218B2
公开(公告)日：2017-06-06
申请号：US14578597
申请日：2014-12-22
Inventor： Yi-Yuh Hwang , Wei-Guo Chang , Chin-Der Hwang , Guang-Sheen Liu , Wen-Jen Lin , Ping-Ya Ko
CPC classification number: G01B11/002 , G01B9/02094
Abstract: A quick subpixel absolute positioning device and method are introduced. The method includes the steps of (A) capturing a real-time speckle pattern of a target surface; (B) providing a coarse-precision speckle coordinate pattern and a plurality of fine-precision speckle coordinate patterns, wherein the coarse-precision speckle coordinate pattern and the fine-precision speckle coordinate patterns include a coordinate value; (C) comparing the real-time speckle coordinate pattern with the coarse-precision speckle coordinate pattern by an algorithm and then comparing the real-time speckle coordinate pattern with the fine-precision speckle coordinate patterns to obtain a coordinate value, wherein each said coarse-precision speckle coordinate pattern corresponds to a set of fine-precision speckle coordinate patterns, and the fine-precision speckle coordinate patterns are obtained when the coarse-precision speckle coordinate pattern is captured again and then captured repeatedly according to a fixed fine-precision displacement distance. Accordingly, the subpixel positioning is attained by quick comparison and manifests high precision.
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公开(公告)号：US10670877B1
公开(公告)日：2020-06-02
申请号：US16224663
申请日：2018-12-18
Inventor： Yi-Yuh Hwang , Wei-Kuo Chang , Li-Chung Liu
Abstract: The present invention is to provide a method of precisely comparing and positioning speckle patterns, which calculates light intensities of the speckle patterns, is capable of enhancing positioning accuracy of the speckle patterns, and is applicable to various navigation input devices for various types of notebook computers, multi-function keyboard and TV remote control.
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Patent Agency Ranking
公开(公告)号：US09773190B2
公开(公告)日：2017-09-26
申请号：US14981815
申请日：2015-12-28
Inventor： Yi-Yuh Hwang , Guang-Sheen Liu , Chin-Der Hwang , Wei-Guo Chang , Chih-Ming Liao
IPC: G06K9/52 , G06T7/60 , G06K9/62 , G06T7/00 , G01D5/347 , G01D18/00 , G01B11/26 , G01D5/30 , G06K9/32 , G06K9/46 , G06K9/74 , G01B21/04 , G01B5/008 , G01B11/00
CPC classification number: G06K9/52 , G01B5/008 , G01B11/005 , G01B11/26 , G01B21/042 , G01D5/30 , G01D5/3473 , G01D18/00 , G06K9/32 , G06K9/4671 , G06K9/6201 , G06K9/74 , G06T7/60
Abstract: The present invention mainly provides a precision calibration method for being applied in a high-precise rotary encoder system, wherein the primary technology feature of the precision calibration method is that: using a laser speckle image capturing module to capture N frames of laser speckle image from an optical position surface of a rotary encoding body, and then using image comparison libraries and particularly-designed mathematical equations to calculate N number of image displacements, so as to eventually calculate N number of primary variation angles and sub variation angles corresponding to the N frames of laser speckle image. Therefore, after the rotary encoding body is rotated by an arbitrary angle, an immediate angle coordinate can be precisely positioned according to the primary variation angles, the secondary variation angles and the N number of image displacements.
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公开(公告)号：US11554506B2
公开(公告)日：2023-01-17
申请号：US17219851
申请日：2021-03-31
Inventor： Yi-Yuh Hwang , Li-Chung Liu
Abstract: A device for measuring repeated positioning precision of a robotic arm is introduced. Using an optical speckle three-dimensional displacement sensor developed by the inventor, and with collaboration of an optical speckle image three-dimensional positioning base built with an optical speckle coordinate database and having low thermal expansion, an optical speckle three-dimensional absolute positioning space is established. The optical speckle three-dimensional displacement sensor is installed on an end effector of a robotic arm, the robotic arm is moved to have the optical speckle three-dimensional displacement sensor enter an optical speckle three-dimensional absolute positioning space, an optical speckle image of a positioning point is captured and compared with a coordinate optical speckle image in the optical speckle coordinate database, and current three-dimensional absolute positioning coordinates of the end effector of the robotic arm can be obtained.
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公开(公告)号：US20210200180A1
公开(公告)日：2021-07-01
申请号：US16726915
申请日：2019-12-25
Inventor： Yi-Yuh Hwang , Li-Chung Liu
IPC: G05B19/404 , B23Q23/00
Abstract: The present invention provides a planar three-dimensional displacement sensor for a multiaxis machining device. With the measurement of the (planar) three-dimensional displacement sensor in the multiaxis machining device, the multiaxis machining device and a multiaxis machining compensation method are able to eliminate various deformation effects effectively.
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公开(公告)号：US20220314468A1
公开(公告)日：2022-10-06
申请号：US17219851
申请日：2021-03-31
Inventor： Yi-Yuh Hwang , Li-Chung Liu
Abstract: A device for measuring repeated positioning precision of a robotic arm is introduced. Using an optical speckle three-dimensional displacement sensor developed by the inventor, and with collaboration of an optical speckle image three-dimensional positioning base built with an optical speckle coordinate database and having low thermal expansion, an optical speckle three-dimensional absolute positioning space is established. The optical speckle three-dimensional displacement sensor is installed on an end effector of a robotic arm, the robotic arm is moved to have the optical speckle three-dimensional displacement sensor enter an optical speckle three-dimensional absolute positioning space, an optical speckle image of a positioning point is captured and compared with a coordinate optical speckle image in the optical speckle coordinate database, and current three-dimensional absolute positioning coordinates of the end effector of the robotic arm can be obtained.
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公开(公告)号：US11442427B2
公开(公告)日：2022-09-13
申请号：US16726915
申请日：2019-12-25
Inventor： Yi-Yuh Hwang , Li-Chung Liu
IPC: G05B19/404 , B23Q23/00 , G01B11/02 , G01B11/00 , G01B11/24 , G01B11/30 , B23Q17/24 , B23Q17/22 , B23Q11/00 , G05B19/402 , B23Q1/62
Abstract: The present invention provides a planar three-dimensional displacement sensor for a multiaxis machining device. With the measurement of the (planar) three-dimensional displacement sensor in the multiaxis machining device, the multiaxis machining device and a multiaxis machining compensation method are able to eliminate various deformation effects effectively.
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