公开(公告)号：US20150346000A1

公开(公告)日：2015-12-03

申请号：US14721455

申请日：2015-05-26

Applicant: Mitutoyo Corporation

Inventor： Yoshiaki Kato

IPC: G01D5/347

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.

Abstract translation: 提供了能够保持基准位置的精度而不考虑附着检测头的误差的刻度尺和光学编码器。 根据本发明的标尺是包括具有预定间距的光栅图案的主信号标度光栅和参考信号图案的标尺，其中主信号标尺光栅在垂直于长度的方向上平行布置 主信号刻度光栅的测量轴，并相位相差1/2，参考信号图案形成在主信号刻度光栅的长度测量轴上。 根据本发明的光学编码器包括光源，主信号光源光栅，参考信号光源光栅，主信号接收器光栅和参考信号接收器元件。

公开(公告)号：US20140217271A1

公开(公告)日：2014-08-07

申请号：US14173227

申请日：2014-02-05

Applicant: MITUTOYO CORPORATION

Inventor： Yoshiaki Kato

IPC: G01D5/347

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：US20140021342A1

公开(公告)日：2014-01-23

申请号：US13944162

申请日：2013-07-17

Applicant: MITUTOYO CORPORATION

Inventor： Yoshiaki Kato

IPC: G01D5/347

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刻度的反射光并输出其中各相的相位相差2pi / N（N为大于或等于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相正弦波的乘数和a的相乘的虚部表示 成员包括N.

公开(公告)号：US20200011711A1

公开(公告)日：2020-01-09

申请号：US16454437

申请日：2019-06-27

Applicant: MITUTOYO CORPORATION

Inventor： Yoshiaki Kato

IPC: G01D5/347

Abstract: There is provided a signal processing method, for a photoelectric encoder, capable of correctly determining a bright part and a dark part of a bright/dark pattern having distorted light intensity distribution by setting an appropriate threshold.A detector unit includes a light source, a light-receiving detector that receives transmitted light from a scale to acquire a bright/dark image, and a lens arranged between the light source and the light-receiving detector. The detector unit classifies the bright/dark image acquired by the light-receiving detector into an image-forming region corresponding to a center region of the lens and a non-image-forming region corresponding to a region except for the center region of the lens, calculates a representative value reflecting a light intensity of the image-forming region, and obtains a pre-processed bright/dark image in which the light intensity of the non-image-forming region is replaced with the representative value.

公开(公告)号：US10466078B2

公开(公告)日：2019-11-05

申请号：US15699413

申请日：2017-09-08

Applicant: Mitutoyo Corporation

Inventor： Yoshiaki Kato

IPC: G01D5/34 ,  G01D5/347

Abstract: An encoder includes a scale having graduations arranged in a measurement direction, a head including a light receiving unit configured to receive, via the scale, light emitted from a light source, and being configured to detect a relative movement amount with respect to the scale by relatively moving in the measurement direction of the scale, and a control unit configured to control the head. The control unit includes a light amount control unit configured to perform control so as to keep a predetermined light receiving amount by increasing or decreasing a light amount of the light source, an error determination unit configured to determine an error based on light received by the light receiving unit, and a light amount suppression unit configured to suppress a light amount of the light source by stopping control performed by the light amount control unit, when the error determination unit determines as an error.

公开(公告)号：US20170227384A1

公开(公告)日：2017-08-10

申请号：US15417675

申请日：2017-01-27

Applicant: Mitutoyo Corporation

Inventor： Yoshiaki Kato

IPC: G01D5/347

CPC classification number: G01D5/34784 ,  G01D5/34715

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：US09557193B2

公开(公告)日：2017-01-31

申请号：US14575027

申请日：2014-12-18

Applicant: Mitutoyo Corporation

Inventor： Yoshiaki Kato

IPC: G01D5/34 ,  G01D5/347

CPC classification number: G01D5/34707 ,  G01D5/34715 ,  G01D5/34746

Abstract: An optical encoder according to the present invention includes a light source that emits light; a scale including scale gratings each having a predetermined pitch; a light source grating disposed between the light source and the scale and having a predetermined pitch; and an interference fringe detector that detects an interference fringe generated by the light source grating and the scale. The scale gratings are disposed side by side, and the adjacent scale gratings are displaced from each other by a ½ period.

Abstract translation: 根据本发明的光学编码器包括发光的光源; 尺度包括每个具有预定间距的刻度光栅; 光源光栅，设置在所述光源和所述标尺之间并具有预定的间距; 以及干涉条纹检测器，其检测由光源光栅和刻度产生的干涉条纹。 刻度光栅并排布置，并且相邻的刻度光栅彼此相移一个半周期。

公开(公告)号：US08981282B2

公开(公告)日：2015-03-17

申请号：US13660436

申请日：2012-10-25

Applicant: Mitutoyo Corporation

Inventor： Yoshiaki Kato

IPC: G01D5/34 ,  G01D5/38

CPC classification number: G01D5/38

Abstract: A photoelectric encoder includes a light-emitting element, a scale, a lens, a PDA, and a signal processing circuit. The signal processing circuit includes a distortion table, a distortion compensation circuit, and a position analyzing circuit. The distortion table is calculated in advance on the basis of pieces of distortion information that were obtained by a distortion simulation using design values of the optical system such as the lens. The distortion compensation circuit corrects a light/dark signal of the PDA by eliminating distortion caused by the optical system by changing the positions of the respective PDs of the PDA virtually on the basis of the distortion table and the pieces of position information of the respective PDs. The position analyzing circuit analyzes a position of the scale on the basis of the corrected light/dark signal.

Abstract translation: 光电编码器包括发光元件，刻度尺，透镜，PDA和信号处理电路。 信号处理电路包括失真表，失真补偿电路和位置分析电路。 基于通过使用诸如透镜的光学系统的设计值进行的失真模拟获得的失真信息，预先计算失真表。 失真补偿电路通过基于失真表和各个PD的位置信息来改变PDA的各个PD的位置，消除由光学系统引起的失真来校正PDA的亮/暗信号 。 位置分析电路基于校正的亮/暗信号分析刻度的位置。

公开(公告)号：US20150060653A1

公开(公告)日：2015-03-05

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，以及包括对所述绝对刻度的绝对图案发光的光源的检测头;以及从所述绝对值接收光的光接收单元 图案，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，其与光栅部分一起生成干涉图案;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。

公开(公告)号：US20230324168A1

公开(公告)日：2023-10-12

申请号：US18120696

申请日：2023-03-13

Applicant: MITUTOYO CORPORATION

Inventor： Yumiko MORI ,  Yoshiaki Kato

IPC: G01B11/24 ,  G01B11/06 ,  G06T7/55 ,  G06T7/60 ,  G06T7/73

CPC classification number: G01B11/0608 ,  G01B11/2441 ,  G06T7/55 ,  G06T7/60 ,  G06T7/73 ,  G06T2207/20048

Abstract: A measurement method of a surface shape and a surface shape measurement device uses an interferometer optical head that acquires an interference fringe image generated by a light path difference between the reference light and the measurement light, acquires N interference fringe images by scanning from a start point to an end point in the Z-axis direction, and measures the surface shape of the measurement target surface based on the interference fringe images. For a common position in the N interference fringe images, regarding an interference signal including values of N points that indicates a change in the interference light intensity along the Z-axis direction, a phase of an interference fringe produced by the light of a predetermined analysis wavelength is determined, and the relative position in the Z-axis direction of the measurement target surface within the range of the analysis wavelength is determined based on the phase.---