公开(公告)号：US12188768B2

公开(公告)日：2025-01-07

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：US11506518B2

公开(公告)日：2022-11-22

申请号：US17529476

申请日：2021-11-18

Applicant: Mitutoyo Corporation

Inventor： Yoshiaki Kato ,  Miyako Mizutani

IPC: G01D5/34 ,  G01D5/347

Abstract: The photoelectric rotary encoder includes: a generally disk-shaped scale with a grating-like pattern formed with a predetermined period along a measurement direction, the measurement direction being a direction of rotation of a measurement target that rotates on a predetermined axis, the scale being plate-like and centered on an axis of rotation; and a head that detect, from the scale, the amount of displacement caused by the rotation of the measurement target. The head includes a light source, a diffraction unit with grating parts, and a light-receiving unit with light-receiving elements. The grating parts of the diffraction unit are formed as deformed grating parts that spread cut wide, from the center on the axis of rotation, along the grating-like pattern of the scale. The light-receiving elements are formed as linear grating parts.

公开(公告)号：US20220170764A1

公开(公告)日：2022-06-02

申请号：US17529476

申请日：2021-11-18

Applicant: Mitutoyo Corporation

Inventor： Yoshiaki Kato ,  Miyako Mizutani

IPC: G01D5/347

Abstract: The photoelectric rotary encoder includes: a generally disk-shaped scale with a grating-like pattern formed with a predetermined period along a measurement direction, the measurement direction being a direction of rotation of a measurement target that rotates on a predetermined axis, the scale being plate-like and centered on an axis of rotation; and a head that detect, from the scale, the amount of displacement caused by the rotation of the measurement target. The head includes a light source, a diffraction unit with grating parts, and a light-receiving unit with light-receiving elements. The grating parts of the diffraction unit are formed as deformed grating parts that spread cut wide, from the center on the axis of rotation, along the grating-like pattern of the scale. The light-receiving elements are formed as linear grating parts.

公开(公告)号：US11320289B2

公开(公告)日：2022-05-03

申请号：US16823953

申请日：2020-03-19

Applicant: MITUTOYO CORPORATION

Inventor： Yoshiaki Kato

IPC: G01D5/347 ,  G01D5/30 ,  G01D5/244 ,  G01D5/245

Abstract: An optical encoder includes a scale, a calculator, and a head having a light source, an image capturer, and a lens array having first and second lenses. The calculator includes a signal generator, an extractor, a signal combiner, and a displacement calculator. The signal generator generates a sine wave signal. The extractor extracts first and second regions. The signal combiner, based on an inter-regional distance, uses a sine wave signal of the second region to generate a sine wave signal that extends to a first end of the first region such that the generated sine wave signal overlaps with a sine wave signal of the first region. The signal combiner also combines the sine wave signal of the first region with the generated sine wave signal. The displacement calculator calculates an amount of relative displacement based on the sine wave signal that is combined by the signal combiner.

公开(公告)号：US20200003581A1

公开(公告)日：2020-01-02

申请号：US16021528

申请日：2018-06-28

Applicant: Mitutoyo Corporation

Inventor： Ted Staton Cook ,  James Allen Hitchman ,  Yoshiaki Kato

IPC: G01D5/20

Abstract: An inductive type position encoder includes a scale, a detector portion and a signal processor. The scale includes a periodic pattern of signal modulating elements (SME) arranged along a measuring axis, with a spatial wavelength W1. One type of SME in the pattern comprises similar conductive plates or loops. The detector portion comprises sensing elements and a field generating coil that generates a changing magnetic flux. The sensing elements may comprise conductive loop portions arranged along the measuring axis and configured to provide detector signals which respond to a local effect on the changing magnetic flux provided by adjacent SME's. In various implementations, the first type of SMEs have an average dimension DSME along the measuring axis direction that is greater than DSEN and at least .55*W1 and at most 0.8*W1, which provides advantageous detector signal characteristics.

公开(公告)号：US20180073898A1

公开(公告)日：2018-03-15

申请号：US15699413

申请日：2017-09-08

Applicant: Mitutoyo Corporation

Inventor： Yoshiaki Kato

IPC: G01D5/347

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

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：US09759584B2

公开(公告)日：2017-09-12

申请号：US14978419

申请日：2015-12-22

Applicant: MITUTOYO CORPORATION

Inventor： Yoshiaki Kato

IPC: G01D5/347 ,  G01D5/244

CPC classification number: G01D5/34746 ,  G01D5/24438

Abstract: In a scale, a reference detection pattern and a displacement detection pattern are formed. A detection head outputs a reference detection signal, a phase compensation signal, and a displacement detection signal. A signal processing unit generates a reference signal by amplifying one or both of the phase compensation signal and the reference detection signal and adding up them, and detects a position of the detection head relative to the scale. A combined light receiving grating includes a reference detection light receiving grating and a phase compensation light receiving grating disposed so as to be shifted from the reference detection light receiving grating in the measurement direction. A combined light receiving element includes a reference detection light receiving element configured to output the reference detection signal and a phase compensation light receiving element configured to output the phase compensation signal.

公开(公告)号：US20150177027A1

公开(公告)日：2015-06-25

申请号：US14575027

申请日：2014-12-18

Applicant: Mitutoyo Corporation

Inventor： Yoshiaki Kato

IPC: 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：US20130105675A1

公开(公告)日：2013-05-02

申请号：US13660436

申请日：2012-10-25

Applicant: MITUTOYO CORPORATION

Inventor： Yoshiaki Kato

IPC: G01D5/347

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：US20240230378A1

公开(公告)日：2024-07-11

申请号：US18617719

申请日：2024-03-27

Applicant: MITUTOYO CORPORATION

Inventor： Yoshiaki Kato ,  Kimitoshi Ono ,  Shunsuke Tanaka

IPC: G01D5/20 ,  G01B7/14

CPC classification number: G01D5/2086 ,  G01B7/14

Abstract: A multi-degree-of-freedom displacement measuring device includes a rotary scale that has a scale pattern including a plurality of patterns that are arranged around a first rotation axis and arrayed along a circumference direction of the rotary scale, a detection head group including a plurality of detection heads, each of which is provided around the first rotation axis, is arranged on an installation face facing the rotary scale, and is configured to detect each of the plurality of patterns from the scale pattern, and a calculator configured to, based on detection values acquired by the plurality of detection heads, calculate a relative rotation angle around the first rotation axis, and calculate at least one of a relative movement amount in a direction along the first rotation axis and a relative movement amount in a direction along a second rotation axis orthogonal to the first rotation axis.