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公开(公告)号：US10520336B2
公开(公告)日：2019-12-31
申请号：US15869845
申请日：2018-01-12
Applicant: Mitutoyo Corporation
Inventor： Osamu Kawatoko , Masaki Matsushita
IPC: G01D5/241
Abstract: The displacement detector is configured to receive a transmission signal output from a transmission signal output unit by a reception electrode disposed in a detection head to detect a displacement between the detection head and a scale based on the received signal. The transmission signal is transmitted from a transmission electrode disposed in the detection head to the reception electrode through a coupling electrode disposed in the scale. Phase adjustment units generates a signal whose phase is adjusted from the transmission signal output from the transmission signal output unit. An amplitude adjustment unit adjusts an amplitude of the signal whose phase is adjusted by the phase adjustment unit to generate a crosstalk correction signal. A demodulation unit samples a signal generated by synthesizing the crosstalk correction signal and the received signal and to demodulate the sampled signal.
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公开(公告)号：US11340095B2
公开(公告)日：2022-05-24
申请号：US17077313
申请日：2020-10-22
Applicant: Mitutoyo Corporation
Inventor： Osamu Kawatoko , Toshihiro Hasegawa , Tomohiro Tahara , Akio Kawai
Abstract: An object is to respectively excite transmission coils with different voltages using a single power supply with low power consumption in an electromagnetic induction type encoder. A detection head of an encoder includes a voltage adjustment circuit and a plurality of excitation circuits. The excitation circuit includes a resonant circuit that includes a driving capacitor and a transmission coil connected in series and generates an alternate-current magnetic field inducing currents in scale coils disposed in a plurality of scale tracks on a scale by connecting both ends of the resonant circuit in a state in which the driving capacitor is charged. The voltage adjustment circuit includes a first transformer capacitor and controls a charging voltage of the driving capacitor in a single excitation circuit using the charged first transformer capacitor.
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公开(公告)号：US20210131831A1
公开(公告)日：2021-05-06
申请号：US17077313
申请日：2020-10-22
Applicant: Mitutoyo Corporation
Inventor： Osamu Kawatoko , Toshihiro Hasegawa , Tomohiro Tahara , Akio Kawai
Abstract: An object is to respectively excite transmission coils with different voltages using a single power supply with low power consumption in an electromagnetic induction type encoder.
A detection head of an encoder includes a voltage adjustment circuit and a plurality of excitation circuits. The excitation circuit includes a resonant circuit that includes a driving capacitor and a transmission coil connected in series and generates an alternate-current magnetic field inducing currents in scale coils disposed in a plurality of scale tracks on a scale by connecting both ends of the resonant circuit in a state in which the driving capacitor is charged. The voltage adjustment circuit includes a first transformer capacitor and controls a charging voltage of the driving capacitor in a single excitation circuit using the charged first transformer capacitor.-
公开(公告)号：US20180216971A1
公开(公告)日：2018-08-02
申请号：US15869845
申请日：2018-01-12
Applicant: Mitutoyo Corporation
Inventor： Osamu Kawatoko , Masaki Matsushita
IPC: G01D5/241
CPC classification number: G01D5/2415
Abstract: The displacement detector is configured to receive a transmission signal output from a transmission signal output unit by a reception electrode disposed in a detection head to detect a displacement between the detection head and a scale based on the received signal. The transmission signal is transmitted from a transmission electrode disposed in the detection head to the reception electrode through a coupling electrode disposed in the scale. Phase adjustment units generates a signal whose phase is adjusted from the transmission signal output from the transmission signal output unit. An amplitude adjustment unit adjusts an amplitude of the signal whose phase is adjusted by the phase adjustment unit to generate a crosstalk correction signal. A demodulation unit samples a signal generated by synthesizing the crosstalk correction signal and the received signal and to demodulate the sampled signal.
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5.发明授权公开(公告)号：US09121734B2
公开(公告)日：2015-09-01
申请号：US14093744
申请日：2013-12-02
Applicant: MITUTOYO CORPORATION
Inventor： Osamu Kawatoko , Hirokazu Kobayashi
CPC classification number: G01D5/34715 , G01D5/24485 , G01D5/34792
Abstract: In a photoelectric absolute encoder including a scale having a plurality of tracks with different pitch patterns, and a detector having a light source and light receiving elements including a plurality of light receiving element arrays corresponding to the plurality of tracks, a light receiving element array is additionally arranged at a position in the detector corresponding to a boundary between the track having a pattern with a wide pitch and the track having a pattern with a narrow pitch adjacent to each other in the scale, and displacement of the detector relative to the scale in a lateral direction is detected from a signal amplitude of the added light receiving element array. In this manner, displacement of the detector relative to the scale in the lateral direction can be detected.
Abstract translation: 在包括具有不同节距图案的多个轨道的刻度的光电绝对编码器和具有光源的检测器和包括与多个轨道相对应的多个光接收元件阵列的光接收元件中，光接收元件阵列是 另外布置在检测器中对应于具有宽间距的图案的轨道之间的边界处的检测器中的位置，并且轨道具有在刻度中彼此相邻的窄间距的图案，并且检测器相对于标尺的位移 从所添加的光接收元件阵列的信号幅度检测横向。 以这种方式，可以检测检测器相对于横向上的刻度的位移。
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Patent Agency Ranking
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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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：US10551224B2
公开(公告)日：2020-02-04
申请号：US15820525
申请日：2017-11-22
Applicant: MITUTOYO CORPORATION
Inventor： Hirokazu Kobayashi , Osamu Kawatoko
Abstract: An encoder includes a light source. A booster circuit boosts a power supply voltage output by a battery, and outputs the boosted voltage. The voltage is applied to one end of a light-emitting diode. A driver circuit is inserted between another end of the light-emitting diode and a ground, the driver circuit controlling current flowing through the light-emitting diode. A voltage detector circuit detects a voltage between the light-emitting diode and the driver circuit. A control circuit causes the booster circuit to boost the power supply voltage when the voltage is lower than the power supply voltage; stops the boosting performed by the booster circuit when the voltage is equal to the power supply voltage; and controls the driver circuit such that, after the voltage reaches a predetermined value, current flows to the light-emitting diode.
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公开(公告)号：US09739587B2
公开(公告)日：2017-08-22
申请号：US14743269
申请日：2015-06-18
Applicant: Mitutoyo Corporation
Inventor： Osamu Kawatoko , Akio Kawai
CPC classification number: G01B3/205 , G01D21/00 , G11C5/147 , H02J3/383 , Y02E10/563
Abstract: A semiconductor integrated circuit includes a regulator configured to stabilize a power supply voltage from a solar cell and to output the same, a voltage detection circuit configured to detect the power supply voltage from the solar cell or an output voltage from the regulator, a power-on-reset circuit configured to output a reset signal to an external digital circuit by a voltage detection signal output from the voltage detection circuit, a memory main body configured to write and read data by the power supply voltage from the solar cell or the output voltage from the regulator.
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