Patents Assigned to Mitutoyo Corporation
  • Patent number: 10830609
    Abstract: There is provided a measuring device that suppresses flickering of display values displayed on a display and, at the same time, improves response of the measuring device. A measuring device includes a storage that stores information about the measuring device, control circuitry that calculates measurement results, and a display that displays the measurement results calculated by the control circuitry. The control circuitry determines whether or not filtering for suppression of a variation in display values Pn displayed on the display is to be executed and executes the filtering in response to the determination that the filtering is to be executed.
    Type: Grant
    Filed: September 21, 2018
    Date of Patent: November 10, 2020
    Assignee: Mitutoyo Corporation
    Inventors: Hirokazu Kobayashi, Shun Mugikura
  • Patent number: 10831035
    Abstract: An optical encoder 10 comprising: a light source 11; a splitter 12 splits a light from the light source 11, a light receiving unit 16; a scale 13 is arranged on a light path and movable in a measurement direction, a grating being arranged on a main surface of the scale; and an offset diffraction grating 14 includes a plurality of diffraction gratings arranged in the optical path from the splitter 12 to the light receiving unit 16, the plurality of diffraction gratings diffracting the split lights with different phases, wherein, the plurality of diffraction gratings 13 in the offset diffraction grating 14 are arranged in one plane parallel to the main surface of the scale and are offset each other in an offset direction orthogonal to the measurement direction, the light receiving unit 16 includes a plurality of light-receiving elements 16-11 to 16-23 arranged in the offset direction.
    Type: Grant
    Filed: October 21, 2015
    Date of Patent: November 10, 2020
    Assignee: MITUTOYO CORPORATION
    Inventor: Akihide Kimura
  • Patent number: 10830568
    Abstract: An object of the present invention is to provide a measurement device and a measurement system which make it possible to obtain various pieces of driving information and realize accurate analysis of an operation state. A measurement device according to an embodiment comprises: a main body which comprises a probe having a gauge head which can be moved, in a relative manner, relative to an object to be measured, and a move mechanism for moving the gauge head; and a control section which controls driving of the move mechanism, and comprises a generation section for generating driving information of the main body, in association with identification information of the probe, in response to driving of the move mechanism, and a recording section for recording the driving information.
    Type: Grant
    Filed: October 1, 2018
    Date of Patent: November 10, 2020
    Assignee: MITUTOYO CORPORATION
    Inventors: Yuuto Karasawa, Mitsuru Fukuda, Kazumi Mizukami
  • Patent number: 10830585
    Abstract: A non-contact type displacement sensor includes a light source that emits measurement light; a liquid lens apparatus in which a refractive index periodically changes in response to an input drive signal; an objective lens emitting, at a measurable object, the measurement light that is emitted from the light source and has passed through the liquid lens apparatus; a photodetector receiving the measurement light that is reflected by the measurable object and outputs a photodetection signal; and a signal processor (controller) that calculates focus timing with which the measurement light is in focus on a surface of the measurable object based on the photodetection signal output from the photodetector, and that obtains a position of the measurable object based on a phase of the focus timing with respect to a cycle of the drive signal.
    Type: Grant
    Filed: July 23, 2019
    Date of Patent: November 10, 2020
    Assignee: MITUTOYO CORPORATION
    Inventors: Koji Kubo, Yuko Shishido
  • Patent number: 10825216
    Abstract: An apparatus reads a value measured with an analog measuring tool. The apparatus includes an imaging unit for obtaining a captured image of the analog measuring tool that is indicating a measured value, a retaining unit for retaining a 3D model of the analog measuring tool, a matching unit for specifying a 3D model matching the captured image, a guidance unit for outputting guidance information for correcting orientation of the analog measuring tool based on the matched 3D model, a reading unit for reading the measured value from the captured image to generate a measurement result, and an output unit for outputting the measurement result.
    Type: Grant
    Filed: December 5, 2018
    Date of Patent: November 3, 2020
    Assignee: MITUTOYO CORPORATION
    Inventor: Shinsaku Abe
  • Patent number: 10816330
    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.
    Type: Grant
    Filed: March 13, 2020
    Date of Patent: October 27, 2020
    Assignee: MITUTOYO CORPORATION
    Inventor: Yoshiaki Kato
  • Patent number: 10816755
    Abstract: A variable focal length lens device includes: a lens system whose refractive index is variable in response to an inputted drive signal; an image detector for detecting an image of a target object through the lens system; a lens controller for outputting the drive signal and an illumination signal; and a lens operation unit for adjusting a frequency and amplitude of the drive signal outputted by the lens controller and an image-detection timing for the image detector. The lens controller includes a resonance-lock controller for tuning the drive signal to a resonance frequency of the lens system. The lens operation unit includes a resonance-lock operation unit for switchably enabling and suspending the resonance-lock controller.
    Type: Grant
    Filed: April 12, 2018
    Date of Patent: October 27, 2020
    Assignee: MITUTOYO CORPORATION
    Inventors: Hiroshi Sakai, Yutaka Watanabe
  • Patent number: 10807206
    Abstract: Measuring apparatus includes an upper support supporting a first end of a columnar work piece in an axis direction, a lower support supporting a second end of the work piece in the axis direction, a probe measuring the work piece supported by the upper support and lower support, a rotary table coupled to the lower support and capable of rotating centered in the axis direction, and a post provided to the rotary table and mounting a first position determiner and a second position determiner so as to be switchable, the first and second position determiner determining a position of the work piece with respect to the rotary table. When a first columnar work piece as the work piece is supported by the upper support and lower support, the first position determiner is mounted to the post to determine a position by contacting the first work piece.
    Type: Grant
    Filed: May 9, 2017
    Date of Patent: October 20, 2020
    Assignee: MITUTOYO CORPORATION
    Inventors: Mitsuru Fukuda, Noritsugu Ono, Hirotada Anzai
  • Patent number: 10809100
    Abstract: An electromagnetic induction type encoder, wherein a detection head has a drive coil generating magnetic flux, wherein a scale has a plurality of connection coils arrayed in a fundamental period ? in a measurement axis direction, are electromagnetically coupled with the magnetic flux generated by the drive coil and generates magnetic flux fluctuating in a predetermined spatial period in the measurement axis direction, wherein the detection head has a plurality of receiver coils arrayed in the fundamental period ? in the measurement axis direction and are electromagnetically coupled with the magnetic flux generated by the plurality of connection coils and detects a phase of the magnetic flux, wherein ?/2?2d<L<?/2 is satisfied when a distance between line width centers of the plurality of connection coils is ā€œLā€ and a line width of the plurality of connection coils is ā€œdā€.
    Type: Grant
    Filed: March 25, 2019
    Date of Patent: October 20, 2020
    Assignee: MITUTOYO CORPORATION
    Inventor: Hiroatsu Mori
  • Patent number: 10812701
    Abstract: A method is provided for operating a tunable acoustic gradient (TAG) lens imaging system. The method includes: (a) providing a smart lighting pulse control routine/circuit (SLPCRC) that provides a first mode of exposure control corresponding to a points from focus (PFF) mode of the TAG lens imaging system and a second mode of exposure control corresponding to an extended depth of focus (EDOF) mode of the TAG lens imaging system; (b) placing a workpiece in a field of view of the TAG lens imaging system; and (c) periodically modulating a focus position of the TAG lens imaging system without macroscopically adjusting the spacing between elements in the TAG lens imaging system, wherein the focus position is periodically modulated over a plurality of focus positions along a focus axis direction in a focus range including a surface height of the workpiece, at a modulation frequency of at least 30 kHz.
    Type: Grant
    Filed: December 13, 2018
    Date of Patent: October 20, 2020
    Assignee: Mitutoyo Corporation
    Inventors: Vahan Senekerimyan, Joseph Andrew Summers, Scott Ellis Hemmings, Mark Lawrence Delaney, Paul Gerard Gladnick, Bjorn Erik Bertil Jansson
  • Patent number: 10809378
    Abstract: A triangulation sensing system includes a projection axis configuration and an imaging axis configuration. The projection axis configuration includes a triangulation light source (e.g. an incoherent source) and a variable focus lens (VFL) that is controlled to rapidly periodically modulate a triangulation light focus position (TLFP) along a Z axis over a focus position scan range, to provide a corresponding triangulation light extended focus range (TLEFR) that supports accurate measurement throughout. In some implementations, the triangulation system may be configured to provide the best measurement accuracy for a workpiece region of interest (WROI) by exposing its triangulation image only when the scanned TLFP temporarily coincides with the WROI Z height. In some implementations, the triangulation system may be configured to limit various measurement operations to using only an operational pixel subset of a detector that receives image light from the WROI, in order to shorten the measurement time.
    Type: Grant
    Filed: September 6, 2019
    Date of Patent: October 20, 2020
    Assignee: Mitutoyo Corporation
    Inventors: Paul Gerard Gladnick, Joseph Daniel Tobiason
  • Publication number: 20200326183
    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.
    Type: Application
    Filed: March 13, 2020
    Publication date: October 15, 2020
    Applicant: MITUTOYO CORPORATION
    Inventor: Yoshiaki KATO
  • Publication number: 20200318948
    Abstract: An optical measuring device includes: an emission device configured to emit a scanning light, of which an optical axis parallely moves, to an object; a light receiving element configured to perform photoelectric conversion with respect to the scanning light after passing over the object; a calculation device configured to calculate, from a voltage wave obtained from time change of an electrical signal that is output by the light receiving element, a distance corresponding to a time range from a first edge with respect to a voltage value where the scanning light is not interrupted by the object and a second edge with respect to a voltage value where the scanning light is interrupted by the object, when a part of the scanning light is interrupted by the object for the time range.
    Type: Application
    Filed: March 20, 2020
    Publication date: October 8, 2020
    Applicant: Mitutoyo Corporation
    Inventors: Ryoichi IMAIZUMI, Ichiro TANIGUCHI
  • Publication number: 20200319001
    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.
    Type: Application
    Filed: March 6, 2020
    Publication date: October 8, 2020
    Applicant: MITUTOYO CORPORATION
    Inventor: Yoshiaki KATO
  • Publication number: 20200321973
    Abstract: Errors in a cyclic analog to digital converter are reduced. An analog to digital converter is a cyclic analog to digital converter for converting an analog input signal into a digital output signal by performing a plurality of times of cycle processing on the analog input signal. A cycle processing unit performs the cycle processing and outputs a digital signal indicating a value of each bit of the digital output signal. An output circuit receives the digital signal output from the cycle processing unit and outputs, as an output signal, a signal obtained by inverting the digital signal every other cycle. A signal input to the cycle processing unit in second and subsequent cycles is generated in the cycle processing in a previous cycle. In the cycle processing, processing for inverting the signal input to the cycle processing is performed.
    Type: Application
    Filed: March 5, 2020
    Publication date: October 8, 2020
    Applicant: MITUTOYO CORPORATION
    Inventor: Shun MUGIKURA
  • Patent number: 10794688
    Abstract: An interferometric optical device that measures the curved wall shape of a cylindrical object and includes: an interferometric optical system that emits measurement light at the curved wall of the object, collects the light reflected by the object, and creates a composite wave that combines the reflected light and a reference light; a rotation drive assembly that is connected to the interferometric optical system and rotationally displaces the interferometric optical system centered about a rotation axis that coincides with a center axis of the cylindrical shape of the object; a sensor that acquires a two-dimensional distribution of the intensity of the composite wave using a plurality of photoreceptor elements arrayed two-dimensionally; and a computation device that computes the internal wall shape of the object based on the plurality of two-dimensional distributions acquired in a state where a rotation angle for the rotation drive mechanism varies.
    Type: Grant
    Filed: March 5, 2019
    Date of Patent: October 6, 2020
    Assignee: MITUTOYO CORPORATION
    Inventors: Ken Motohashi, Johannes Anna Quaedackers, Adriaan Tiemen Zuiderweg
  • Publication number: 20200309572
    Abstract: An optical encoder includes a scale; a head that includes a light source, an image capturer, and a lens array having a first lens and a second lens; and a calculator. The calculator includes a signal generator that generates a sine wave signal; an analysis region extractor that extracts a first analysis region and a second analysis region; a signal combiner that, based on an inter-regional distance, uses a sine wave signal of the second analysis region to generate a sine wave signal that extends to a first end of the first analysis region such that the generated sine wave signal overlaps with a sine wave signal of the first analysis region, and combines the sine wave signal of the first analysis region with the generated sine wave signal; and a displacement amount calculator that calculates an amount of relative displacement based on the sine wave signal that is combined by the signal combiner.
    Type: Application
    Filed: March 19, 2020
    Publication date: October 1, 2020
    Applicant: MITUTOYO CORPORATION
    Inventor: Yoshiaki KATO
  • Patent number: 10788312
    Abstract: A coordinate measuring unit includes a measuring probe and a processing device configured to compute the shape coordinates of an object to be measured on the basis of an output of the measuring probe. The measuring probe has a first identification code. The processing device includes a first determination portion configured to determine whether the first identification code outputted from the measuring probe is matched with a matching code, and a downstream determination portion configured to identify a second identification code outputted from the measuring probe to thereby recognize the measuring probe when the first identification code is matched with the matching code in the first determination portion and the measuring probe further has the second identification code. The coordinate measuring unit with the aforementioned configuration can efficiently recognize a number of measuring probes.
    Type: Grant
    Filed: June 20, 2018
    Date of Patent: September 29, 2020
    Assignee: MITUTOYO CORPORATION
    Inventors: Kazuhiko Hidaka, Satoshi Yoshitani
  • Patent number: 10781856
    Abstract: The present invention relates to improving precision in a gate-type moving device. The gate-type moving device includes: a base, a gate-type moving body that is placed on the base via an air layer and moves on the base in a non-contact state, and an air bearing that forms the air layer, wherein the gate-type moving body is comprised of two leg parts that stand on an upper surface of the base, a beam portion that connects the leg parts, and a beam-direction moving body that moves along the beam portion, the air bearing is provided at a rear surface of at least one of the leg parts, and comprises an air blowout port that opens toward an upper surface of the base and an air suction port that opens toward the upper surface of the base, and the air suction port sucks air around the air suction port.
    Type: Grant
    Filed: July 6, 2018
    Date of Patent: September 22, 2020
    Assignee: MITUTOYO CORPORATION
    Inventors: Seiichi Otsubo, Kenji Ueda
  • Patent number: 10775199
    Abstract: A pitch compensated inductive position encoder includes a scale comprising first and second tracks including periodic patterns having a wavelength W, a detector, and signal processing. The second track pattern may be shifted along the measuring direction by a pattern offset STO relative to the first track pattern. In the detector, first-track and second-track field generating coil portions generate fields in first and second interior areas aligned with the first and second pattern tracks, respectively. First and second sensing coil configurations that are aligned with the first and second tracks, respectively, are offset relative to one another by STO+/?0.5*W along the measuring direction. In various embodiments, the first and second sensing coil configurations may have the same sequence of individual coil polarities if the generated field polarities are different, and may have inverted or opposite sequences if the generated field polarities are the same.
    Type: Grant
    Filed: March 2, 2018
    Date of Patent: September 15, 2020
    Assignee: Mitutoyo Corporation
    Inventor: Ted Staton Cook