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公开(公告)号：US10474516B2
公开(公告)日：2019-11-12
申请号：US15598929
申请日：2017-05-18
Applicant: Mitutoyo Corporation
Inventor： Naoki Kobayashi
Abstract: An encoder includes: a reading device that reads respective electric signals from two incremental patterns respectively having graduation array pitches different from each other; a control device that calculates a measurement value, based on the electric signals; and an output device that outputs the measurement value. The control device includes: an absolute position synthesis unit that synthesizes two electric signals to generate a synthesized absolute position; a detection unit that detects two relative positions from the two electric signals; a position calculation unit that performs an arithmetic operation between the relative positions and the synthesized absolute position to calculate a calculated absolute position; an absolute position comparison unit that compares the calculated absolute position with the synthesized absolute position; and a relative position comparison unit that compares the two relative positions with each other. The output device outputs error information, based on a comparison result output from the control device.
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公开(公告)号：US20170344417A1
公开(公告)日：2017-11-30
申请号：US15598929
申请日：2017-05-18
Applicant: Mitutoyo Corporation
Inventor： Naoki Kobayashi
CPC classification number: G06F11/0715 , G01D5/24495 , G01D5/2458 , G05B2219/37136 , G06F11/0751 , G06F11/0772
Abstract: An encoder includes: a reading device that reads respective electric signals from two incremental patterns respectively having graduation array pitches different from each other; a control device that calculates a measurement value, based on the electric signals; and an output device that outputs the measurement value. The control device includes: an absolute position synthesis unit that synthesizes two electric signals to generate a synthesized absolute position; a detection unit that detects two relative positions from the two electric signals; a position calculation unit that performs an arithmetic operation between the relative positions and the synthesized absolute position to calculate a calculated absolute position; an absolute position comparison unit that compares the calculated absolute position with the synthesized absolute position; and a relative position comparison unit that compares the two relative positions with each other. The output device outputs error information, based on a comparison result output from the control device.
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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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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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