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公开(公告)号：US10571306B2
公开(公告)日：2020-02-25
申请号：US16178012
申请日：2018-11-01
申请人： Mitutoyo Corporation
发明人： Tomohiro Tahara
IPC分类号： G01D5/20
摘要： The electromagnetic induction type position detector includes a scale having a plurality of gradation coils, a head having a transmission unit and a reception unit, and a control unit. Each of the plurality of graduation coils includes a transmission graduation arranged with a pitch L1, a reception graduation arranged with a pitch L0 different from the pitch L1, and a connection unit. The transmission unit includes three transmission coil groups that are constituted by pluralities of transmission coils, each being arranged with a pitch L1, and that are arranged such that adjacent transmission coil groups have a phase difference. The reception unit includes three reception coil groups that are constituted by pluralities of reception coils, each being arranged with a pitch L0, and that are arranged such that adjacent reception coil groups have a phase difference identical to the phase difference of the three transmission coil groups.
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公开(公告)号：US20220307866A1
公开(公告)日：2022-09-29
申请号：US17698406
申请日：2022-03-18
申请人： Mitutoyo Corporation
发明人： Shu Hirata , Tomohiro Tahara , Akio Kawai , Shun Mugikura
摘要： A preamplifier amplifies signals input to first and second input terminals. A first switching circuit receives first and second input signals and respectively outputs those signals to the first and second input terminals. A switched capacitor circuit samples two signals amplified by the preamplifier. An integration circuit includes a fully differential operational amplifier outputting amplifying differential signals input between third and fourth input terminals between second and first output terminals, and first and second integration capacitors. A second switching circuit switches a connection relationship between the switched capacitor circuit, and the first and second integration capacitors. A third switching circuit switches a connection relationship between the first and second integration capacitors, and third and fourth output terminals. A cycle including sampling and signal integration is performed twice, and the first to third switching circuits switch the connection relationships each time the cycle changes.
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公开(公告)号：US20130206970A1
公开(公告)日：2013-08-15
申请号：US13766077
申请日：2013-02-13
申请人： MITUTOYO CORPORATION
发明人： Tomohiro Tahara
IPC分类号： G01D5/347
CPC分类号： G01D5/34746 , G01D5/35383
摘要： A photoelectric encoder according to the present invention comprises a light-receiving unit including: a first and second light-receiving element column; and a light-blocking layer configured from a light-blocking portion and a light-transmitting portion, the first and second light-receiving element columns being disposed staggered in a second direction such that an arrangement pattern of light-receiving elements in the first and second light-receiving element columns has a pitch which is the same in a first direction and a phase which differs in the first direction, and the light-transmitting portion on the light-receiving surface of the light-receiving element in the first light-receiving element column and the light-transmitting portion on the light-receiving surface of the light-receiving element in the second light-receiving element column being formed so as not to overlap each other when staggered in the second direction.
摘要翻译： 根据本发明的光电编码器包括：光接收单元，包括：第一和第二光接收元件列; 以及由遮光部分和透光部分构成的遮光层，所述第一和第二光接收元件列沿第二方向交错布置，使得第一和第二光接收元件列的光接收元件的布置图案 第二光接收元件列具有在第一方向上相同的间距和在第一方向上不同的相位，并且第一光接收元件列中的受光元件的受光面上的透光部分， 第二光接收元件列中的光接收元件的受光面上的透光部形成为在第二方向交错时不会彼此重叠。
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公开(公告)号：US20220311399A1
公开(公告)日：2022-09-29
申请号：US17698417
申请日：2022-03-18
申请人： Mitutoyo Corporation
发明人： Shu Hirata , Tomohiro Tahara , Akio Kawai , Shun Mugikura
IPC分类号： H03F3/45
摘要： A preamplifier amplifies signals input to first and second input terminals. A first switching circuit receives first and second input signals and outputs those to the first and second input terminals. A switched capacitor circuit samples two signals amplified by the preamplifier. Differential signals sampled by the switched capacitor circuit are respectively input to third and fourth input terminals of an integration circuit, and the integration circuit outputs differential signals obtained by those input signals to first and second output terminals. A second switching circuit switches a connection relationship between the switched capacitor circuit and the integration circuit. Each time the cycle changes, the first and second switching circuits switch the connection relationships to cause the signals amplified by the preamplifier to be sampled by double correlation sampling.
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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
申请人： MITUTOYO CORPORATION
摘要： 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：US20190170538A1
公开(公告)日：2019-06-06
申请号：US16178012
申请日：2018-11-01
申请人： Mitutoyo Corporation
发明人： Tomohiro Tahara
IPC分类号： G01D5/20
CPC分类号： G01D5/2086 , G01D5/206
摘要： The electromagnetic induction type position detector includes a scale having a plurality of gradation coils, a head having a transmission unit and a reception unit, and a control unit. Each of the plurality of graduation coils includes a transmission graduation arranged with a pitch L1, a reception graduation arranged with a pitch L0 different from the pitch L1, and a connection unit. The transmission unit includes three transmission coil groups that are constituted by pluralities of transmission coils, each being arranged with a pitch L1, and that are arranged such that adjacent transmission coil groups have a phase difference. The reception unit includes three reception coil groups that are constituted by pluralities of reception coils, each being arranged with a pitch L0, and that are arranged such that adjacent reception coil groups have a phase difference identical to the phase difference of the three transmission coil groups.
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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
申请人： Mitutoyo Corporation
摘要： 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
申请人： Mitutoyo Corporation
摘要： 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：US09719811B2
公开(公告)日：2017-08-01
申请号：US13766077
申请日：2013-02-13
申请人： MITUTOYO CORPORATION
发明人： Tomohiro Tahara
CPC分类号： G01D5/34746 , G01D5/35383
摘要： A photoelectric encoder according to the present invention comprises a light-receiving unit including: a first and second light-receiving element column; and a light-blocking layer configured from a light-blocking portion and a light-transmitting portion, the first and second light-receiving element columns being disposed staggered in a second direction such that an arrangement pattern of light-receiving elements in the first and second light-receiving element columns has a pitch which is the same in a first direction and a phase which differs in the first direction, and the light-transmitting portion on the light-receiving surface of the light-receiving element in the first light-receiving element column and the light-transmitting portion on the light-receiving surface of the light-receiving element in the second light-receiving element column being formed so as not to overlap each other when staggered in the second direction.
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