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公开(公告)号：US20240302150A1
公开(公告)日：2024-09-12
申请号：US18592909
申请日：2024-03-01
Applicant: MITUTOYO CORPORATION
Inventor： Shunsuke Tanaka , Hirokazu Kobayashi
CPC classification number: G01B3/004 , G01B5/24 , G01B7/30 , G01B2210/58
Abstract: A measuring device includes a rotary encoder having a rotary scale and a plurality of detection portions, and a control device. The rotary scale are arranged around a rotation axis and has a scale pattern in which a plurality of patterns are arranged along a circumferential direction. The plurality of detection portions are arranged around the rotation axis, and reads the plurality of patterns from the scale pattern. The control device causes one or some detection portions to perform a first reading of the plurality of patterns at a first timing, causes another or other detection portions different from the one or some detection portions to perform a second reading of the plurality of patterns at a second timing different from the first timing, and calculates a measurement result based on a first reading result of the first reading and a second reading result of the second reading.
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公开(公告)号：US20190219424A1
公开(公告)日：2019-07-18
申请号：US16240005
申请日：2019-01-04
Applicant: Mitutoyo Corporation
Inventor： Hirokazu Kobayashi , Akio Kawai
CPC classification number: G01D5/34715 , G01D5/24476
Abstract: A measurement apparatus includes: a light source that emits light; a scale that has a plurality of tracks whose patterns are different from each other, the tracks passing at least a part of lights emitted by the light source; a light receiving part that has a plurality of light receiving elements that each output an optical signal corresponding to strength of light received through the tracks; and a signal generation part that generates a serial signal in which a plurality of the optical signals are time-division multiplexed and sends the generated serial signal.
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3.发明授权公开(公告)号：US10907996B2
公开(公告)日：2021-02-02
申请号：US16240005
申请日：2019-01-04
Applicant: Mitutoyo Corporation
Inventor： Hirokazu Kobayashi , Akio Kawai
Abstract: A measurement apparatus includes: a light source that emits light; a scale that has a plurality of tracks whose patterns are different from each other, the tracks passing at least a part of lights emitted by the light source; a light receiving part that has a plurality of light receiving elements that each output an optical signal corresponding to strength of light received through the tracks; and a signal generation part that generates a serial signal in which a plurality of the optical signals are time-division multiplexed and sends the generated serial signal.
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公开(公告)号：US20240337474A1
公开(公告)日：2024-10-10
申请号：US18624666
申请日：2024-04-02
Applicant: MITUTOYO CORPORATION
Inventor： Shunsuke Tanaka , Hirokazu Kobayashi
Abstract: A measuring device includes a first scale provided on a rotary scale, arranged around an rotation axis of the rotary scale, and having first patterns arranged along a circumferential direction, a second scale provided on the rotary scale, arranged around the rotation axis, and having a plurality of second patterns arranged along the circumferential direction, first pattern detection sections arranged around the rotation axis, a second detection section that faces the second scale and reads at least a part of the plurality of second patterns, and a calculator configured to identify an absolute angle of the rotary scale, on a basis of a reading result of the first pattern detection sections and a reading result of the second pattern detection section. A number of the second pattern detection section is less than a number of the plurality of first pattern detection sections.
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公开(公告)号：US11137269B2
公开(公告)日：2021-10-05
申请号：US15804170
申请日：2017-11-06
Applicant: MITUTOYO CORPORATION
Inventor： Osamu Kawatoko , Tomohiro Tahara , Hirokazu Kobayashi
Abstract: A reference voltage generator circuit generates a reference voltage corresponding to a power supply voltage. A current/voltage converter circuit converts a photocurrent output by a photoreceiver into voltage, and outputs a voltage obtained by adding the converted voltage and the reference voltage. A sample and hold circuit holds a voltage of a capacitor in response to a sample and hold signal, the capacitor having the voltage input at one end and the reference voltage input at another end. An amplifier circuit outputs an output signal where a voltage held by the sample and hold circuit is amplified with the reference voltage as a reference.
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Patent Agency Ranking
公开(公告)号：US11079258B2
公开(公告)日：2021-08-03
申请号：US16281223
申请日：2019-02-21
Applicant: MITUTOYO CORPORATION
Inventor： Hirokazu Kobayashi , Rie Arai
Abstract: A position detection encoder includes a scale that has a position detection pattern and a linear pattern that is formed in a direction parallel to a length direction of the position detection pattern; and a position detector generating a position detection signal with a different value due to a displacement of the position detection pattern in the length direction. In the position detector, a position confirmation pattern is formed that includes two markers arranged at an interval equal to or less than an offset tolerance value for a positional relationship of the position detector and the scale in a width direction of the position detection pattern.
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公开(公告)号：US10254137B2
公开(公告)日：2019-04-09
申请号：US15372578
申请日：2016-12-08
Applicant: Mitutoyo Corporation
Inventor： Hirokazu Kobayashi
IPC: G01D5/347
Abstract: A photoelectric encoder includes light receiving units configured to output a plurality of photocurrent signals obtained by receiving light emitted from a light emission unit, via a scale, a signal conversion unit configured to output a conversion signal by converting the plurality of photocurrent signals, a position calculation unit configured to calculate an absolute position based on the conversion signal, and a microcomputer configured to perform drive control of the light emission unit, the signal conversion unit, and the position calculation unit. The microcomputer intermittently drives at least either one of the light emission unit and the signal conversion unit, and causes the position calculation unit to execute calculation according to a timing of intermit driving.
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公开(公告)号：US11422009B2
公开(公告)日：2022-08-23
申请号：US17144496
申请日：2021-01-08
Applicant: Mitutoyo Corporation
Inventor： Osamu Kawatoko , Hirokazu Kobayashi
Abstract: A rotary encoder that is capable of securing a sufficient synthesis tolerance while achieving miniaturization is provided. The rotary encoder 1 includes a rotor 3, a stator 4, and a calculating unit 5 for calculating the rotation angle. The rotor 3 has a first rotor pattern 31 with a plurality of unit patterns 310 arranged along the measurement direction around the rotating shaft 2, and a second rotor pattern 32 with fewer unit patterns 320 than the plurality of unit patterns 310 in the first rotor pattern 310 arranged along the measurement direction. The number of the plurality of unit patterns 310 of the first rotor pattern 31 and the number of the plurality of unit patterns 320 of the second rotor pattern 32 are provided such that the maximum common divisor therebetween is two or more. The calculating unit calculates the rotation angle of the rotor 3 based on the detection signals from the first rotor pattern 31 and the second rotor pattern 32.
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公开(公告)号：US20210215511A1
公开(公告)日：2021-07-15
申请号：US17144496
申请日：2021-01-08
Applicant: Mitutoyo Corporation
Inventor： Osamu Kawatoko , Hirokazu Kobayashi
Abstract: A rotary encoder that is capable of securing a sufficient synthesis tolerance while achieving miniaturization is provided. The rotary encoder 1 includes a rotor 3, a stator 4, and a calculating unit 5 for calculating the rotation angle. The rotor 3 has a first rotor pattern 31 with a plurality of unit patterns 310 arranged along the measurement direction around the rotating shaft 2, and a second rotor pattern 32 with fewer unit patterns 320 than the plurality of unit patterns 310 in the first rotor pattern 310 arranged along the measurement direction. The number of the plurality of unit patterns 310 of the first rotor pattern 31 and the number of the plurality of unit patterns 320 of the second rotor pattern 32 are provided such that the maximum common divisor therebetween is two or more. The calculating unit calculates the rotation angle of the rotor 3 based on the detection signals from the first rotor pattern 31 and the second rotor pattern 32.
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公开(公告)号：US10830609B2
公开(公告)日：2020-11-10
申请号：US16138229
申请日：2018-09-21
Applicant: Mitutoyo Corporation
Inventor： Hirokazu Kobayashi , Shun Mugikura
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.
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