公开(公告)号：US20210140799A1

公开(公告)日：2021-05-13

申请号：US17082563

申请日：2020-10-28

Applicant: Mitutoyo Corporation

Inventor： Yoshiaki Kato

IPC: G01D5/20

Abstract: A scale capable of maintaining measurement accuracy even if the pattern of the scale pattern is scratched is provided. The scale 2 comprises a scale pattern 4 having a plurality of unit patterns provided at a predetermined pitch along the measurement direction on a surface thereof. At least one of the plurality of unit patterns comprises a plurality of loop portions 8 formed with conductors in a loop shape. The plurality of loop portions 8 included in the unit pattern are arranged so as to be spaced from each other such that the centers of gravity of the loop portions 8 are at the same position in the measurement direction on the surface of the scale 2. Thereby, the plurality of loop portions 8 included in the unit pattern can prevent deviation of the center of gravity of the magnetic flux distribution in the measurement direction, even if any of the plurality of the loop portions 8 is scratched. Therefore, the scale 2 can maintain the measurement accuracy.

公开(公告)号：US09752901B2

公开(公告)日：2017-09-05

申请号：US14721455

申请日：2015-05-26

Applicant: Mitutoyo Corporation

Inventor： Yoshiaki Kato

IPC: G01D5/347 ,  G01D5/244

CPC classification number: G01D5/34715 ,  G01D5/24438 ,  G01D5/347

Abstract: A scale and an optical encoder capable of maintaining an accuracy of a reference position irrespective of an error in attaching a detection head are provided. The scale according to the present invention is a scale including main-signal scale gratings having grating patterns of a predetermined pitch, and a reference-signal pattern, in which the main-signal scale gratings are arranged in parallel in a direction perpendicular to a length measurement axis of the main-signal scale gratings and are different from each other in phase by ½, and the reference-signal pattern is formed on the length measurement axis of the main-signal scale gratings. The optical encoder according to the present invention includes a light source, main-signal light source gratings, reference-signal light source gratings, main-signal receiver gratings, and a reference-signal receiver element.

公开(公告)号：US09329056B2

公开(公告)日：2016-05-03

申请号：US13944162

申请日：2013-07-17

Applicant: MITUTOYO CORPORATION

Inventor： Yoshiaki Kato

IPC: G01D5/34 ,  G01D5/244 ,  G01D5/347 ,  G01D5/36

CPC classification number: G01D5/24476 ,  G01D5/24438 ,  G01D5/34707 ,  G01D5/36

Abstract: An encoder includes a light receiving part and a computing part. The light receiving part receives reflected light from a scale and outputs N-phase sinusoidal signals in which respective phases of fundamental waves differ by 2π/N (N is an integer more than or equal to 5). The computing part outputs a two-phase sinusoidal signal including an A phase and a B phase according to each of the N-phase sinusoidal signals. The A phase is expressed by a real part of sum of multiplier of N-phase sinusoidal waves and a member including the N. The B phase is expressed by an imaginary part of the sum of the multiplier of the N-phase sinusoidal waves and a member including the N.

Abstract translation: 编码器包括光接收部分和计算部分。 光接收部分接收来自标尺的反射光，并输出其中各相的相位相差2＆pgr / N（N为大于等于5的整数）的N相正弦信号。 计算部分根据N相正弦信号中的每一个输出包括A相和B相的两相正弦信号。 A相由N相正弦波的乘数和包括N的成员之和的实数部分表示.B相由N相正弦波乘法器之和和的虚部表示， 成员包括N.

公开(公告)号：US09175986B2

公开(公告)日：2015-11-03

申请号：US14173227

申请日：2014-02-05

Applicant: MITUTOYO CORPORATION

Inventor： Yoshiaki Kato

IPC: G01B21/22 ,  G01D5/347 ,  G01D5/244 ,  G01D18/00

CPC classification number: G01D5/34746 ,  G01D5/24452 ,  G01D5/24485 ,  G01D5/2458 ,  G01D18/00

Abstract: In a separate linear encoder, a scale is further provided with an ABS track that is arranged in parallel with an INC track and a detection head includes an ABS detection portion that reads the ABS track. The separate linear encoder includes a calculation portion that obtains a yaw angle of the detection head with respect to a scale based on a gap between an INC detection portion and an ABS detection portion and a difference amount between a position value of the INC track, which is detected by the INC detection portion, and a position of the ABS track, which is detected by the ABS detection portion. The calculation portion also obtains a signal strength based on two-phase sine wave signals that are output from the INC detection portion. The separate linear encoder further includes a display device that displays a plurality of yaw angles and the signal strengths corresponding to the respective yaw angles.

Abstract translation: 在单独的线性编码器中，刻度尺还设置有与INC轨道并联布置的ABS轨道，并且检测头包括读取ABS轨道的ABS检测部分。 单独的线性编码器包括基于INC检测部和ABS检测部之间的间隙和INC轨迹的位置值之间的差量来获得检测头相对于刻度的偏航角的计算部，其中 由INC检测部分检测到，并且由ABS检测部分检测到的ABS轨迹的位置。 计算部分还获得基于从INC检测部分输出的两相正弦波信号的信号强度。 单独的线性编码器还包括显示装置，其显示多个偏航角和对应于各个偏航角的信号强度。

公开(公告)号：US20230082750A1

公开(公告)日：2023-03-16

申请号：US17895267

申请日：2022-08-25

Applicant: MITUTOYO CORPORATION

Inventor： Shunsuke Tanaka ,  Yoshiaki Kato ,  Miyako Mizutani

IPC: G01B7/30 ,  G01B11/26 ,  G01D5/20

Abstract: An angle detector includes a rotary scale having a scale pattern in which a plurality of patterns are arrayed along a circumference direction of the rotary scale, and a plurality of detection heads, each of which detects the plurality of patterns from the scale pattern. The plurality of detection heads are shifted from each other in the circumference direction of the rotary scale and are shifted from each other in a radial direction of the rotary scale.

公开(公告)号：US11326902B2

公开(公告)日：2022-05-10

申请号：US17082563

申请日：2020-10-28

Applicant: Mitutoyo Corporation

Inventor： Yoshiaki Kato

IPC: G01D5/347 ,  G01D5/20

Abstract: A scale capable of maintaining measurement accuracy even if the pattern of the scale pattern is scratched is provided. The scale 2 comprises a scale pattern 4 having a plurality of unit patterns provided at a predetermined pitch along the measurement direction on a surface thereof. At least one of the plurality of unit patterns comprises a plurality of loop portions 8 formed with conductors in a loop shape. The plurality of loop portions 8 included in the unit pattern are arranged so as to be spaced from each other such that the centers of gravity of the loop portions 8 are at the same position in the measurement direction on the surface of the scale 2. Thereby, the plurality of loop portions 8 included in the unit pattern can prevent deviation of the center of gravity of the magnetic flux distribution in the measurement direction, even if any of the plurality of the loop portions 8 is scratched. Therefore, the scale 2 can maintain the measurement accuracy.

公开(公告)号：US11105656B2

公开(公告)日：2021-08-31

申请号：US16811420

申请日：2020-03-06

Applicant: MITUTOYO CORPORATION

Inventor： Yoshiaki Kato

IPC: G01D5/347

Abstract: Scale pattern in a scale of an optical encoder includes a first scale mark that blocks a first light from being guided to an image capturer and guides a second light to the image capturer, and a second scale mark that guides the first light and the second light to the image capturer. Second scale mark is arranged in an ABS pattern and the first scale mark is arranged in an INC pattern by incorporating the second scale mark. Image capturer includes a first image capturing section that captures an image of the ABS pattern from the first light that arrives via the second scale mark, and a second image capturing section that captures an image of the INC pattern from the second light that arrives via the first scale mark and the second scale mark. Calculator calculates a position of a head relative to the scale.

公开(公告)号：US10088341B2

公开(公告)日：2018-10-02

申请号：US15417675

申请日：2017-01-27

Applicant: Mitutoyo Corporation

Inventor： Yoshiaki Kato

IPC: G01D5/347

Abstract: The photoelectric encoder 1 includes a scale 2, and a detection head 3 including a light emitting unit 4, an index 5, and a detection unit 6. The index 5 includes a first index portion 50 consisting of diffraction portions and non-diffraction portions alternately juxtaposed at a predetermined pitch along the longitudinal direction of the scale 2, and a second index portion 51 consisting of diffraction portions and non-diffraction portions alternately juxtaposed at twice the pitch of the first index portion 50. The scale 2 is configured to include a first pattern portion 20 consisting of diffraction portions and non-diffraction portions alternately juxtaposed at a predetermined pitch along the longitudinal direction of the scale 2, and a second pattern portion 21 consisting of diffraction portions and non-diffraction portions arranged in a checkered pattern.

公开(公告)号：US10024695B2

公开(公告)日：2018-07-17

申请号：US14943309

申请日：2015-11-17

Applicant: MITUTOYO CORPORATION

Inventor： Yoshiaki Kato

IPC: G01D5/347 ,  G01D5/36

Abstract: An optical encoder includes an origin point detection scale having an origin point detection pattern and an inverse origin point detection pattern that is the inverse of the origin point detection pattern; a light source emitting light at the origin point detection scale; a light source grid that is inserted on the light source side of the origin point detection scale, the light source grid having two first light source grid patterns corresponding to the origin point detection pattern and the inverse origin point detection pattern, respectively; a photoreceiver detecting a signal from light that has passed through the origin point detection scale; and a photoreceiver grid inserted on the photoreceiver side of the origin point detection scale, the photoreceiver grid having two first photoreceiver grid patterns that are a pattern either identical to or the inverse of the first light source grid pattern.

公开(公告)号：US09383231B2

公开(公告)日：2016-07-05

申请号：US14474594

申请日：2014-09-02

Applicant: Mitutoyo Corporation

Inventor： Toru Yaku ,  Yoshiaki Kato

IPC: G01D5/347

CPC classification number: G01D5/34784 ,  G01D5/34715 ,  G01D5/34723 ,  G01D5/34746

Abstract: A photoelectric encoder includes an absolute scale provided with an absolute pattern based on pseudo-random data, and a detection head including a light source that emits light to the absolute pattern of the absolute scale, and a light receiving unit that receives light from the absolute pattern, and it detects an absolute position of the detection head with respect to the absolute scale. In the photoelectric encoder, the absolute pattern is composed of a grating part and a dark part arranged in a repetitive manner. The photoelectric encoder further includes an interference pattern generation means that generates an interference pattern in combination with the grating part, and an interference pattern signal processing unit that detects the pseudo-random data of the absolute pattern based on the interference pattern received by the light receiving unit.

Abstract translation: 光电编码器包括：具有基于伪随机数据的绝对图案的绝对刻度，以及包括发光到绝对刻度的绝对图案的光源的检测头，以及从绝对像素接收光的光接收单元 模式，并且它相对于绝对刻度检测检测头的绝对位置。 在光电编码器中，绝对图案由重复布置的光栅部分和暗部组成。 光电编码器还包括干涉图案生成装置，其与光栅部分组合产生干涉图案;以及干涉图案信号处理单元，其基于由光接收接收到的干涉图案来检测绝对图案的伪随机数据 单元。