公开(公告)号：US11054287B2

公开(公告)日：2021-07-06

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：US10907995B2

公开(公告)日：2021-02-02

申请号：US16405107

申请日：2019-05-07

Applicant: Mitutoyo Corporation

Inventor： Yoshiaki Kato

IPC: G01D5/249 ,  G01D5/20

Abstract: There is provided an electromagnetic inductive encoder that allows reduction in the number of tracks on a scale for reduction in the size of the scale. The electromagnetic inductive encoder includes a scale having a scale pattern, a head, and computation unit. The head includes transmission unit, which includes transmission coils, and reception unit, which includes reception coils. The scale pattern has a first pattern, which causes the reception coils to receive positive current, and a second pattern, which causes the reception coils to receive negative current. The computation unit includes a determination unit, which, when the positive current is detected, determines that the current is associated with the first pattern, and, when the negative current is detected, determines that the current is associated with the second pattern, a signal generation unit, which generates a signal formed of “1” representing the first pattern and “0” representing the second pattern based on the result of the determination, and a position calculation unit, which calculates the position of the head based on the signal generated by the signal generation unit.

公开(公告)号：US10816330B1

公开(公告)日：2020-10-27

申请号：US16818400

申请日：2020-03-13

Applicant: MITUTOYO CORPORATION

Inventor： Yoshiaki Kato

IPC: G01B11/24 ,  G01B11/00 ,  G01B11/25 ,  G01B11/30

Abstract: A head provided to a shape measuring apparatus includes a translucent stylus head that displaces integrally with a light source and a photoreceiver, and is arranged between the light source and the photoreceiver. The stylus head includes an incident portion that causes the light from the light source to be incident on an interior of the stylus head, a reflection portion that totally reflects the incident light, and a light emission portion that emits the light that is totally reflected toward the photoreceiver. Evanescent light is generated at the measurement surface by the light that is totally reflected by the total reflection surface. The stylus head brings the measurement surface and a surface of a measurable object to face each other, separates the measurement surface from the surface of the measurable object, and is arranged such that the evanescent light reaches the surface of the measurable object.

公开(公告)号：US10317253B2

公开(公告)日：2019-06-11

申请号：US15177499

申请日：2016-06-09

Applicant: Mitutoyo Corporation

Inventor： Yoshiaki Kato

IPC: G01D5/34 ,  G01D5/347 ,  G01D5/38

Abstract: A scale includes a scale grating formed with a period P. A light source grating includes a grating formed with a period 2P, the light source grating being disposed between a light source and the scale. Interference fringe detection means is configured to be able to detect a bright part of an interference fringe with the period P, the interference fringe being generated by the light source grating and the scale. The interference fringe detection means detects a first interference fringe formed by light coming from the scale and a second interference fringe formed by light coming from the scale, a position of a bright part of the second interference fringe being shifted from a position of a bright part of the first interference fringe by a half of the period P (i.e., P/2).

公开(公告)号：US20160363464A1

公开(公告)日：2016-12-15

申请号：US15177499

申请日：2016-06-09

Applicant: Mitutoyo Corporation

Inventor： Yoshiaki Kato

IPC: G01D5/347

CPC classification number: G01D5/34715 ,  G01D5/34746 ,  G01D5/38

Abstract: A scale includes a scale grating formed with a period P. A light source grating includes a grating formed with a period 2P, the light source grating being disposed between a light source and the scale. Interference fringe detection means is configured to be able to detect a bright part of an interference fringe with the period P, the interference fringe being generated by the light source grating and the scale. The interference fringe detection means detects a first interference fringe formed by light coming from the scale and a second interference fringe formed by light coming from the scale, a position of a bright part of the second interference fringe being shifted from a position of a bright part of the first interference fringe by a half of the period P (i.e., P/2).

Abstract translation: 标尺包括形成有周期P的刻度光栅。光源光栅包括形成有周期2P的光栅，光源光栅设置在光源和刻度之间。 干涉条纹检测装置被配置为能够利用周期P检测干涉条纹的明亮部分，干涉条纹由光源光栅和刻度产生。 干涉条纹检测装置检测由来自标尺的光形成的第一干涉条纹和由标尺形成的第二干涉条纹，第二干涉条纹的明亮部分的位置从明亮部分的位置偏移 的第一个干涉条纹是期间P的一半（即P / 2）。

公开(公告)号：US09036285B2

公开(公告)日：2015-05-19

申请号：US14284694

申请日：2014-05-22

Applicant: MITUTOYO CORPORATION

Inventor： Yoshiaki Kato

IPC: G11B5/09 ,  G11B20/10 ,  G01D5/244 ,  G01D5/245 ,  G11B5/008 ,  G01D5/347

CPC classification number: G11B20/10259 ,  G01D5/24428 ,  G01D5/24476 ,  G01D5/2454 ,  G01D5/34746 ,  G11B5/00813

Abstract: A position detection encoder includes a scale and a detection head and has position detection circuits which are capable of outputting respective pieces of position information on Xf, Xs two tracks. The displacement detection encoder includes: a speed detection circuit which is provided in the detection head and detects a relative speed Xf, Xs relative to the scale; and a delay generation circuit which provides a time difference between two output request signals, the time difference being provided on the basis of a fine adjustment time tadj based on the relative speed Xf, Xs and the respective pieces of position information Xf, Xs on the two tracks, the output request signals St1, St2 urging the first and second position detection circuits to output the pieces of position information on Xf, Xs the two tracks.

Abstract translation: 位置检测编码器包括标尺和检测头，并且具有位置检测电路，其能够输出关于Xf，Xs两个轨道的各个位置信息。 位移检测编码器包括：速度检测电路，其设置在检测头中，并检测相对于标尺的相对速度Xf，Xs; 以及延迟生成电路，其在两个输出请求信号之间提供时间差，基于相对速度Xf，Xs和相应的位置信息Xf，Xs，基于微调时间tadj提供的时间差 两个轨道，输出请求信号St1，St2推动第一和第二位置检测电路输出关于Xf的位置信息，Xs是两个轨道。