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公开(公告)号：US20240175729A1
公开(公告)日：2024-05-30
申请号：US18500545
申请日：2023-11-02
申请人： MITUTOYO CORPORATION
发明人： Akihide Kimura , Kimitoshi Ono , Keitaro Koyatsu
CPC分类号： G01D5/38 , G01D5/3473
摘要： An optical encoder includes: a scale having a scale grating; a light source that emits light; and a light-receiving device that receives light that has passed through the scale. The optical encoder also has a shielding plate that shapes the beam shape, which is the shape of the light emitted from the light source. The shielding plate is disposed between the light source and the scale and defines the beam shape such that the shape of a long-length contour portion and the shape of a long-length side section have no correlation with each other. The long-length contour portion is a portion extending in the measurement direction at the contour of the beam shape of the light emitted to the light-receiving device via the scale, and the long-length side section is a section extending in the measurement direction at the contour of the light-receiving device.
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2.发明授权公开(公告)号：US09157769B2
公开(公告)日：2015-10-13
申请号：US14270721
申请日：2014-05-06
申请人： MITUTOYO CORPORATION
发明人： Akihide Kimura
CPC分类号： G01D5/347 , G01D5/24438 , G01D5/366 , G01D5/38
摘要： A reference point detection light-receiving unit receives light from a reference point detection pattern by first to fifth light-receiving elements. The first to fifth light-receiving elements are arranged in a first direction and outputs first to fifth signals, respectively. A reference signal generation circuit outputs a reference signal that starts at a period where a level of a signal, which is obtained by adding first and second signals, and a level of a signal, which is obtained by adding third and fourth signals, will become equal, and ends at a period where a level of a signal, which is obtained by adding the second and third signals, and a level of a signal, which is obtained by adding fourth and fifth signals, become equal.
摘要翻译： 参考点检测光接收单元通过第一至第五光接收元件从参考点检测图案接收光。 第一至第五光接收元件分别布置在第一方向上并输出第一至第五信号。 参考信号发生电路输出参考信号，该参考信号在通过添加第一和第二信号获得的信号的电平和通过添加第三和第四信号而获得的信号电平将变为 相等，并且在通过将第二和第三信号相加获得的信号的电平和通过增加第四和第五信号获得的信号电平变得相等的时段结束。
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公开(公告)号：US20240110816A1
公开(公告)日：2024-04-04
申请号：US18474331
申请日：2023-09-26
申请人： Mitutoyo Corporation
发明人： Akihide Kimura
IPC分类号： G01D5/347
CPC分类号： G01D5/34746
摘要： An optical encoder is provided that can reduce the effects of unwanted diffracted light in a stable manner. The optical encoder 1 comprises a scale 2 and a detection head 3. The detection head 3 includes a light source 4 and light-receiving means 6 with a light-receiving surface 60. The light-receiving surface 60 has an element row 7 with multiple light-receiving elements 70 arranged along the measurement direction with the same period as that of the interference fringes. Here, an error included in detection signals generated from the interference fringes, with such error being caused by the fact that the number of light-receiving elements 70 is an odd number, will be referred to as a number-of-elements-induced error, and a predetermined allowable error will be referred to as an allowable error. The number of light-receiving elements 70 in the element row 7 is set to be a number where the number-of-elements-induced error is smaller than the allowable error. Such number-of-elements-induced error is caused when there is an odd total number of light-receiving elements 70 and such odd total number of light-receiving elements 70 are functional, or when there is an even total number of light-receiving elements 70 but one less than such even total number of light-receiving elements are functional.
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公开(公告)号：US11774270B2
公开(公告)日：2023-10-03
申请号：US17407761
申请日：2021-08-20
申请人： Mitutoyo Corporation
CPC分类号： G01D5/3473 , G01D5/34715 , G01D5/2415 , G01D5/24414 , G01D5/34794 , G01D2205/85 , G01D2205/90
摘要： An encoder includes scale and detection head. The detection head includes light source (transmitting unit) and light-receiving unit (receiving unit). The light-receiving unit includes light-receiving surface (receiving surface) and converts light received at the light-receiving surface 50 into differential detection signals with two phases and outputs the same. The light-receiving surface includes element array group including four element arrays provided in a parallel manner along an orthogonal direction, with each element array including a plurality of light-receiving elements (receiving elements). The plurality of element arrays in the element array group are disposed at positions where the sum of: (i) a distance in the orthogonal direction from a reference position to a positive phase signal element array; and (ii) a distance in the orthogonal direction from the reference position to the negative phase signal element array, is the same for all the phases of the at least two phases.
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公开(公告)号：US10190893B2
公开(公告)日：2019-01-29
申请号：US15384628
申请日：2016-12-20
申请人： MITUTOYO CORPORATION
发明人： Akihide Kimura
IPC分类号： G01D5/347
摘要： A scale has a first pattern area and a second pattern areas disposed with an offset from the first pattern area in a measurement direction by 1/(2×s) of pitch. A detection head detects interference fringes caused by positive s-th-order diffracted beams and negative s-th-order diffracted beams diffracted by the scale, and output a detection result. A signal processing unit detects a reference position based on a position where light intensity is lower than a predetermined value which appears in a light intensity distribution of the interference fringes, and detects incremental positions based on the interference fringes which appear at other positions. The detection head includes a light source, a detecting unit configured to output the detection result of the beams radiated onto light receiving devices to the signal processing unit, and an optical system configured to image positive s-th-order diffracted beams and negative s-th-order diffracted beams on the detecting unit.
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公开(公告)号：US20190003860A1
公开(公告)日：2019-01-03
申请号：US15637750
申请日：2017-06-29
申请人： Mitutoyo Corporation
IPC分类号： G01D5/347
摘要： An optical encoder configuration comprises an illumination portion, a scale, and a photodetector configuration. The illumination portion transmits source light to a scale which outputs a periodic scale light pattern to the photodetector configuration. The photodetector configuration comprises a set of N spatial phase detectors arranged in a spatial phase sequence along a direction transverse to the measuring axis comprising two outer spatial phase detectors at a start and end of the sequence along the direction transverse to the measuring axis. At least a majority of the respective spatial phase detectors are relatively elongated along the measuring axis direction and relatively narrow along the direction perpendicular to the measuring axis direction, and comprise periodic scale light receptor areas positioned corresponding to a respective spatial phase of that spatial phase detector relative to the periodic scale light pattern, and are configured to provide a respective spatial phase detector signal.
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7.发明申请公开(公告)号：US20190003859A1
公开(公告)日：2019-01-03
申请号：US15702520
申请日：2017-09-12
申请人： Mitutoyo Corporation
摘要： An optical encoder configuration comprises a scale, an illumination source, and a photodetector configuration. The illumination source is configured to output structured illumination to the scale. The scale extends along a measuring axis direction and is configured to output scale light that forms a detector fringe pattern comprising periodic high and low intensity bands that extend over a relatively longer dimension along the measuring axis direction and are relatively narrow and periodic along a detected fringe motion direction transverse to the measuring axis direction. The high and low intensity bands move along the detected fringe motion direction transverse to the measuring axis direction as the scale grating displaces along the measuring axis direction. The photodetector configuration is configured to detect a displacement of the high and low intensity bands along the detected fringe motion direction and provide respective spatial phase displacement signals that are indicative of the scale displacement.
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公开(公告)号：US20170030744A1
公开(公告)日：2017-02-02
申请号：US15220483
申请日：2016-07-27
申请人： MITUTOYO CORPORATION
发明人： Akihide Kimura
IPC分类号： G01D5/26
摘要： A displacement detecting device includes a scale diffraction grating and a detecting head unit. The detecting head unit includes a light source, a first retroreflecting unit that retroreflectes positive first-order diffracted light of light diffracted by the scale diffraction grating, such that the retroreflected light enters the scale diffraction grating again, a second retroreflecting unit that retroreflectes negative first-order diffracted light of the light diffracted by the scale diffraction grating, such that the retroreflected light enters the scale diffraction grating again, and a light receiving unit that receives an interference signal Each of the first retroreflecting unit and the second retroreflecting unit has a deflecting function of deflecting light incident on the corresponding retroreflecting unit by a predetermined angle and then emitting the light.
摘要翻译： 位移检测装置包括标尺衍射光栅和检测头单元。 检测头单元包括光源，第一回射单元，其回射由比例衍射光栅衍射的光的正一级衍射光，使得回射光再次进入刻度衍射光栅;第二回射单元，其向后反射第一反射单元 由折射衍射光栅衍射的光的衍射光，使得回射光再次进入刻度衍射光栅，以及接收干涉信号的光接收单元。第一回射单元和第二回射单元中的每一个具有偏转 将入射到相应回射单元上的光偏转预定角度然后发射光的功能。
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公开(公告)号：US11199400B2
公开(公告)日：2021-12-14
申请号：US16881578
申请日：2020-05-22
申请人： MITUTOYO CORPORATION
发明人： Akihide Kimura
摘要： The optical angle sensor comprises a diffraction unit, a light source, a light receiving unit, and a plurality of reflection units. The diffraction unit includes a first diffraction part for generating combined light and a second diffraction part for diffracting a first light and a second light a plurality of times. The plurality of reflection units includes a first reflection unit, a second reflection unit, a third reflection unit that reflects the first light and the second light through the second diffraction part toward the second diffraction part, fourth reflection unit, and fifth reflection unit. The calculating unit, with the rotation of the diffraction unit, calculates the amount of change in the angle based on the change in the interference signal caused by the combined light generated on the light receiving surface.
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公开(公告)号：US10859374B2
公开(公告)日：2020-12-08
申请号：US16502106
申请日：2019-07-03
申请人： Mitutoyo Corporation
发明人： Akihide Kimura
摘要： The present invention provides an optical angle sensor capable of detecting a wide range of angles with high resolution, having no scale, and specifying a reference angle. The optical angle sensor includes a light source for irradiating light, a reflection means for rotating around a predetermined axis as a measurement axis and reflecting the light irradiated from the light source, a light receiving means for receiving the light irradiated from the light source, and a calculation means for calculating the light received by the light receiving means as a signal. The light receiving means receives the light irradiated from the light source through the reflection means. The calculation means includes a specifying means for specifying the reference angle based on the light received by the light receiving means, and an angle calculating unit for calculating an absolute angle based on the light received by the light receiving means and the reference angle specified by the specifying means.
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