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公开(公告)号：US11486735B2
公开(公告)日：2022-11-01
申请号：US17496350
申请日：2021-10-07
Applicant: Mitutoyo Corporation
Inventor： Miyako Mizutani
IPC: G01D5/20
Abstract: An electromagnetic inductive encoder that can suppress the effect of changes in magnetic flux received by the receiver section and maintain the accuracy of measurement results is provided. The electromagnetic inductive encoder 1 includes a scale 2 and a head 3 that is provided to face the scale 2 and moves relative to the scale 2. The head 3 includes a transmitter section 4 and a receiver section 5 with a plurality of receiving coils 500. The receiver section 5 has a first receiver section 51 with at least one receiving coil 500, a second receiver section 52 that is provided apart from the first receiver section 51 and has at least one receiving coil 500 different from the first receiver section 51, and connection wiring 53 that connects the first receiver section 51 and second receiver section 52. The first receiver section 51 and the second receiver section 52 are arranged linearly symmetrically with the axis L1 of the Y-direction, which is orthogonal to the X-direction (measurement direction) in the plane 30 where the receiving coils 500 are arranged, and are arranged in the same number.
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公开(公告)号：US11307059B2
公开(公告)日：2022-04-19
申请号：US16746166
申请日：2020-01-17
Applicant: Mitutoyo Corporation
Inventor： Miyako Mizutani
Abstract: A life detection device of an encoder is used for the encoder including a scale and a head. The scale is housed in a scale frame. The head relatively moves along the scale to detect an amount of relative movement with the scale. The life detection device includes environmental condition detection means, life determination means, and informing means. The environmental condition detection means is configured to detect an environmental condition related to life detection in the encoder. The life determination means is configured to determine a life of a component constituting the encoder based on a detection result by the environmental condition detection means. The informing means is configured to inform the life based on a determination result by the life determination means.
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公开(公告)号：US20230082750A1
公开(公告)日：2023-03-16
申请号：US17895267
申请日：2022-08-25
Applicant: MITUTOYO CORPORATION
Inventor： Shunsuke Tanaka , Yoshiaki Kato , Miyako Mizutani
Abstract: An angle detector includes a rotary scale having a scale pattern in which a plurality of patterns are arrayed along a circumference direction of the rotary scale, and a plurality of detection heads, each of which detects the plurality of patterns from the scale pattern. The plurality of detection heads are shifted from each other in the circumference direction of the rotary scale and are shifted from each other in a radial direction of the rotary scale.
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公开(公告)号：US10648839B2
公开(公告)日：2020-05-12
申请号：US15978593
申请日：2018-05-14
Applicant: Mitutoyo Corporation
Inventor： Miyako Mizutani
Abstract: Provided is a photoelectric encoder that can achieve higher accuracy while maintaining reliability by reducing stray light. An encoder 1 is a photoelectric encoder including a light source device 2 that emits parallel light, a scale 3 having calibrations C provided along a measurement direction, and a light receiving unit 4 that receives light being emitted from the light source device 2, and transmitted through the scale 3. The encoder 1 includes an antireflection member 30 that prevents stray light generated by being reflected on the scale 3, from entering the light receiving unit 4. Because the encoder 1 includes the antireflection member 30, the encoder 1 can achieve higher accuracy while maintaining reliability by reducing stray light entering the light receiving unit 4.
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公开(公告)号：US10416002B2
公开(公告)日：2019-09-17
申请号：US15784803
申请日：2017-10-16
Applicant: Mitutoyo Corporation
Inventor： Miyako Mizutani , Kimitoshi Ono , Fujio Maeda
IPC: G01D5/347
Abstract: Provided are a light source device that can achieve higher accuracy while maintaining reliability by reducing stray light, and a photoelectric encoder including the same. A light source device 2 includes a translucent member 10 configured to accommodate a light emitting unit 5 thereinside, and to make light emitted from the light emitting unit 5, into parallel light. The translucent member 10 includes an optical axis plane 11, an orthogonal plane 12, a reflection portion configured to make light from the light emitting unit 5, into parallel light, and a connection portion 14 formed by the optical axis plane 11 and the orthogonal plane 12 connecting to each other, and having a curved surface. A central axis AX of the curved surface is in an outside region of the translucent member 10, and a region between the optical axis plane 11 and the orthogonal plane 12.
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Patent Agency Ranking
公开(公告)号：US20180335320A1
公开(公告)日：2018-11-22
申请号：US15978593
申请日：2018-05-14
Applicant: Mitutoyo Corporation
Inventor： Miyako Mizutani
IPC: G01D5/347
Abstract: Provided is a photoelectric encoder that can achieve higher accuracy while maintaining reliability by reducing stray light. An encoder 1 is a photoelectric encoder including a light source device 2 that emits parallel light, a scale 3 having calibrations C provided along a measurement direction, and a light receiving unit 4 that receives light being emitted from the light source device 2, and transmitted through the scale 3. The encoder 1 includes an antireflection member 30 that prevents stray light generated by being reflected on the scale 3, from entering the light receiving unit 4. Because the encoder 1 includes the antireflection member 30, the encoder 1 can achieve higher accuracy while maintaining reliability by reducing stray light entering the light receiving unit 4.
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公开(公告)号：US12188768B2
公开(公告)日：2025-01-07
申请号：US17895267
申请日：2022-08-25
Applicant: MITUTOYO CORPORATION
Inventor： Shunsuke Tanaka , Yoshiaki Kato , Miyako Mizutani
Abstract: An angle detector includes a rotary scale having a scale pattern in which a plurality of patterns are arrayed along a circumference direction of the rotary scale, and a plurality of detection heads, each of which detects the plurality of patterns from the scale pattern. The plurality of detection heads are shifted from each other in the circumference direction of the rotary scale and are shifted from each other in a radial direction of the rotary scale.
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公开(公告)号：US11506518B2
公开(公告)日：2022-11-22
申请号：US17529476
申请日：2021-11-18
Applicant: Mitutoyo Corporation
Inventor： Yoshiaki Kato , Miyako Mizutani
Abstract: The photoelectric rotary encoder includes: a generally disk-shaped scale with a grating-like pattern formed with a predetermined period along a measurement direction, the measurement direction being a direction of rotation of a measurement target that rotates on a predetermined axis, the scale being plate-like and centered on an axis of rotation; and a head that detect, from the scale, the amount of displacement caused by the rotation of the measurement target. The head includes a light source, a diffraction unit with grating parts, and a light-receiving unit with light-receiving elements. The grating parts of the diffraction unit are formed as deformed grating parts that spread cut wide, from the center on the axis of rotation, along the grating-like pattern of the scale. The light-receiving elements are formed as linear grating parts.
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公开(公告)号：US20220170764A1
公开(公告)日：2022-06-02
申请号：US17529476
申请日：2021-11-18
Applicant: Mitutoyo Corporation
Inventor： Yoshiaki Kato , Miyako Mizutani
IPC: G01D5/347
Abstract: The photoelectric rotary encoder includes: a generally disk-shaped scale with a grating-like pattern formed with a predetermined period along a measurement direction, the measurement direction being a direction of rotation of a measurement target that rotates on a predetermined axis, the scale being plate-like and centered on an axis of rotation; and a head that detect, from the scale, the amount of displacement caused by the rotation of the measurement target. The head includes a light source, a diffraction unit with grating parts, and a light-receiving unit with light-receiving elements. The grating parts of the diffraction unit are formed as deformed grating parts that spread cut wide, from the center on the axis of rotation, along the grating-like pattern of the scale. The light-receiving elements are formed as linear grating parts.
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公开(公告)号：US20200240816A1
公开(公告)日：2020-07-30
申请号：US16746166
申请日：2020-01-17
Applicant: Mitutoyo Corporation
Inventor： Miyako Mizutani
Abstract: A life detection device of an encoder is used for the encoder including a scale and a head. The scale is housed in a scale frame. The head relatively moves along the scale to detect an amount of relative movement with the scale. The life detection device includes environmental condition detection means, life determination means, and informing means. The environmental condition detection means is configured to detect an environmental condition related to life detection in the encoder. The life determination means is configured to determine a life of a component constituting the encoder based on a detection result by the environmental condition detection means. The informing means is configured to inform the life based on a determination result by the life determination means.
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