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公开(公告)号：US11536590B2
公开(公告)日：2022-12-27
申请号：US16911865
申请日：2020-06-25
Applicant: MITUTOYO CORPORATION
Inventor： Kenichi Hayashi , Naoki Kobayashi , Hiroatsu Mori
IPC: G01D5/244
Abstract: An offset correction device includes: an amplitude adjuster that adjusts an amplitude of a detection signal output from an encoder by adjusting a gain of the detection signal so that the amplitude is within a predetermined range; an offset corrector that corrects an offset of an amplitude center of the detection signal; and a storage that stores a relationship between the gain and an offset amount in advance, wherein the offset corrector refers to the relationship stored in the storage when the amplitude adjuster changes the gain, obtains the offset amount corresponding to the changed gain, and corrects the offset based on the obtained offset amount.
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公开(公告)号：US09329059B2
公开(公告)日：2016-05-03
申请号：US13767101
申请日：2013-02-14
Applicant: MITUTOYO CORPORATION
Inventor： Kenichi Hayashi , Hiroaki Kawada
CPC classification number: G01D5/34746 , G01D5/345
Abstract: A photoelectric encoder includes an irradiation unit configured to apply first and second irradiation light beams having a first linear polarization direction, a scale configured to produce first and second diffraction light beams having the first linear polarization direction by diffracting the first and second irradiation light beams, respectively, the scale having a glass plate whose front surface has a grating shape, a polarizing unit configured to convert the first diffraction light beam into a third diffraction light beam having a second linear polarization direction which is perpendicular to the first linear polarization direction, to produce first and second composite light beams by combining the second diffraction light beam and the third diffraction light beam, and to convert the first composite light beam into a circularly polarized third composite light beam, and a light receiver configured to receive the second composite light beam and the third composite light beam.
Abstract translation: 一种光电编码器包括：照射单元，被配置为施加具有第一线性偏振方向的第一和第二照射光束，刻度被配置为通过衍射第一和第二照射光束来产生具有第一线偏振方向的第一和第二衍射光束; 分别具有前表面具有光栅形状的玻璃板，将第一衍射光束转换为具有垂直于第一线偏振方向的第二线偏振方向的第三衍射光束的偏振部件， 通过组合第二衍射光束和第三衍射光束来产生第一和第二复合光束，并将第一复合光束转换成圆偏振的第三复合光束;以及光接收器，被配置为接收第二复合光束 和第三复合光束。
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公开(公告)号：US20130214137A1
公开(公告)日：2013-08-22
申请号：US13767101
申请日：2013-02-14
Applicant: Mitutoyo Corporation
Inventor： Kenichi Hayashi , Hiroaki Kawada
CPC classification number: G01D5/34746 , G01D5/345
Abstract: A photoelectric encoder includes an irradiation unit configured to apply first and second irradiation light beams having a first linear polarization direction, a scale configured to produce first and second diffraction light beams having the first linear polarization direction by diffracting the first and second irradiation light beams, respectively, the scale having a glass plate whose front surface has a grating shape, a polarizing unit configured to convert the first diffraction light beam into a third diffraction light beam having a second linear polarization direction which is perpendicular to the first linear polarization direction, to produce first and second composite light beams by combining the second diffraction light beam and the third diffraction light beam, and to convert the first composite light beam into a circularly polarized third composite light beam, and a light receiver configured to receive the second composite light beam and the third composite light beam.
Abstract translation: 一种光电编码器包括：照射单元，被配置为施加具有第一线性偏振方向的第一和第二照射光束，刻度被配置为通过衍射第一和第二照射光束来产生具有第一线偏振方向的第一和第二衍射光束; 分别具有前表面具有光栅形状的玻璃板，将第一衍射光束转换为具有垂直于第一线偏振方向的第二线偏振方向的第三衍射光束的偏振部件， 通过组合第二衍射光束和第三衍射光束来产生第一和第二复合光束，并将第一复合光束转换成圆偏振的第三复合光束;以及光接收器，被配置为接收第二复合光束 和第三复合光束。
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公开(公告)号：US11320287B2
公开(公告)日：2022-05-03
申请号：US16896842
申请日：2020-06-09
Applicant: MITUTOYO CORPORATION
Inventor： Hiroatsu Mori , Kenichi Hayashi , Naoki Kobayashi
Abstract: An electromagnetic induction type encoder, wherein at least one of widths of a first transceiver coil, a first plurality of conductors and a first receiver coil of a first track in a direction vertical to facing direction between a detection head and a scale and a measurement direction is different from corresponding width of a second transceiver coil, a second plurality of conductors and a second receiver coil in the direction vertical to the facing direction and the measurement direction.
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