Patents by Inventor Shirou Yoshidomi
Shirou Yoshidomi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 9843241Abstract: A motor according to an embodiment includes a motor body, a rotating body, and a magnetic field sensor. The motor body rotates a shaft about the axis line thereof. The rotating body includes a permanent magnet and rotates along with the rotation of the shaft. The magnetic field sensor includes a magnet body having a large Barkhausen effect with the long direction thereof serving as the easy magnetization direction and is positioned to face the permanent magnet when the rotational position of the rotating body is at a given rotational position. The easy magnetization direction of the magnetic body is in a direction along a plane orthogonal to the rotation center line of the rotating body.Type: GrantFiled: June 18, 2014Date of Patent: December 12, 2017Assignee: KABUSHIKI KAISHA YASKAWA DENKIInventors: Shirou Yoshidomi, Ikuma Murokita
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Patent number: 9252644Abstract: This disclosure discloses a servomotor production method of a servomotor including a motor and an encoder. The encoder includes a rotating disk and an optical module. The rotating disk is mounted on a shaft of the motor and includes at least one concentric slit formed around a disk center. The optical module is provided with a light receiving element configured to receive light emitted from a light source and subjected to an action of the concentric slit on a substrate. The servomotor production method includes adjusting a position of the optical module with respect to the rotating disk by using the concentric slit by means of an output of the light receiving element when the optical module is fixed and arranged facing the rotating disk.Type: GrantFiled: January 21, 2014Date of Patent: February 2, 2016Assignee: KABUSHIKI KAISHA YASKAWA DENKIInventors: Yasushi Yoshida, Yuji Arinaga, Shirou Yoshidomi, Yasuhiro Matsutani
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Patent number: 9080898Abstract: This disclosure discloses an encoder. The encoder includes a slit array and an optical module. The optical module includes a point light source and a light receiving array comprising a plurality of light receiving elements arranged side by side along the measurement axis and arranged around the point light source in a plane parallel to the slit array, the light receiving elements being respectively receiving light irradiated from the point light source and reflected from the reflection slit. The light receiving array includes a first light receiving array and a second light receiving array. The point light source, the first light receiving array and the second light receiving array are arranged in the manner that a shortest distance between the point light source and the first light receiving array is smaller than a shortest distance between the point light source and the second light receiving array.Type: GrantFiled: July 26, 2013Date of Patent: July 14, 2015Assignee: KABUSHIKI KAISHA YASKAWA DENKIInventors: Yasushi Yoshida, Shirou Yoshidomi, Yasuhiro Matsutani, Jiro Muraoka
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Patent number: 8896256Abstract: Reflected light can be effectively utilized by increasing a light receiving area. Incremental light receiving element groups are separated and arranged in the circumferential direction of a rotating unit while placing a light source therebetween. First and second absolute light receiving element groups are arranged at both sides of the outside and inside of the light source in the radial direction of the rotating unit. As a result, first and second absolute light receiving elements are continuously arranged, and also the incremental light receiving element groups and the absolute light receiving element groups can be arranged to surround the periphery of the light source from four directions.Type: GrantFiled: April 22, 2013Date of Patent: November 25, 2014Assignee: Kabushiki Kaisha Yaskawa DenkiInventors: Yasushi Yoshida, Yuji Arinaga, Shirou Yoshidomi, Yasuhiro Matsutani
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Publication number: 20140300254Abstract: A motor according to an embodiment includes a motor body, a rotating body, and a magnetic field sensor. The motor body rotates a shaft about the axis line thereof. The rotating body includes a permanent magnet and rotates along with the rotation of the shaft. The magnetic field sensor includes a magnet body having a large Barkhausen effect with the long direction thereof serving as the easy magnetization direction and is positioned to face the permanent magnet when the rotational position of the rotating body is at a given rotational position. The easy magnetization direction of the magnetic body is in a direction along a plane orthogonal to the rotation center line of the rotating body.Type: ApplicationFiled: June 18, 2014Publication date: October 9, 2014Applicant: Kabushiki Kaisha Yaskawa DenkiInventors: Shirou YOSHIDOMI, Ikuma MUROKITA
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Publication number: 20140132124Abstract: This disclosure discloses a servomotor production method of a servomotor including a motor and an encoder. The encoder includes a rotating disk and an optical module. The rotating disk is mounted on a shaft of the motor and includes at least one concentric slit formed around a disk center. The optical module is provided with a light receiving element configured to receive light emitted from a light source and subjected to an action of the concentric slit on a substrate. The servomotor production method includes adjusting a position of the optical module with respect to the rotating disk by using the concentric slit by means of an output of the light receiving element when the optical module is fixed and arranged facing the rotating disk.Type: ApplicationFiled: January 21, 2014Publication date: May 15, 2014Applicant: KABUSHIKI KAISHA YASKAWA DENKIInventors: Yasushi YOSHIDA, Yuji ARINAGA, Shirou YOSHIDOMI, Yasuhiro MATSUTANI
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Patent number: 8674287Abstract: An encoder includes a slit array along a first measurement axis, and an optical module capable of relatively moving with respect to the slit array. The optical module comprises a point light source that irradiates the part of the slit array, and a light receiving array comprising a plurality of light receiving elements along a second measurement axis and arranged in positions offset with respect to the point light source. The light receiving elements is receiving light irradiated from the point light source and reflected from the reflection slit. The plurality of light receiving elements comprises respective shapes such that the light receiving element nearer to the point light source comprises a shorter length in a width direction and end parts on an opposite side of the light receiving element with respect to the point light source are arranged side by side in positions along the second measurement axis.Type: GrantFiled: February 8, 2012Date of Patent: March 18, 2014Assignee: Kabushiki Kaisha Yaskawa DenkiInventors: Yasushi Yoshida, Shirou Yoshidomi, Yasuhiro Matsutani, Jiro Muraoka
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Patent number: 8624453Abstract: A motor with an encoder has a motor, and an encoder disposed on the anti-load side of this motor. The motor includes a motor electromagnetic part, and a motor shaft rotatably supported by a load side bearing and an anti-load side bearing, and the encoder includes a hub having a convex part formed in a load side end thereof, the hub being coaxially fixed to an anti-load side end of the motor shaft, and a rotating disc fixed to an anti-load side end of this hub. The convex part of the hub is fitted to a concave part formed in the anti-load side end of the motor shaft so that the hub is fixed to the motor shaft.Type: GrantFiled: February 1, 2013Date of Patent: January 7, 2014Assignee: Kabushiki Kaisha Yaskawa DenkiInventors: Shirou Yoshidomi, Yuji Arinaga, Hiroyuki Fujita, Yasuhiro Matsutani
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Publication number: 20130306849Abstract: This disclosure discloses an encoder. The encoder includes a slit array and an optical module. The optical module includes a point light source and a light receiving array comprising a plurality of light receiving elements arranged side by side along the measurement axis and arranged around the point light source in a plane parallel to the slit array, the light receiving elements being respectively receiving light irradiated from the point light source and reflected from the reflection slit. The light receiving array includes a first light receiving array and a second light receiving array. The point light source, the first light receiving array and the second light receiving array are arranged in the manner that a shortest distance between the point light source and the first light receiving array is smaller than a shortest distance between the point light source and the second light receiving array.Type: ApplicationFiled: July 26, 2013Publication date: November 21, 2013Applicant: KABUSHIKI KAISHA YASKAWA DENKIInventors: Yasushi YOSHIDA, Shirou YOSHIDOMI, Yasuhiro MATSUTANI, Jiro MURAOKA
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Patent number: 8546744Abstract: An encoder includes a disc-shaped disk disposed so as to be rotatable about a rotation axis and having at least one ring-shaped track in which a rotating grating is formed and at least one fixed grating which is fixedly disposed opposed to the disk so that the fixed grating and the rotating grating construct a diffraction interference optical system. Each of a plurality of slits included in the at least one rotating grating is formed along a curved line obtained by making each of a plurality of radial lines using the rotation axis as a center curved in the circumferential direction at a predetermined curve degree so that a pitch of the slits can be set to a predetermined value.Type: GrantFiled: September 15, 2010Date of Patent: October 1, 2013Assignee: Kabushiki Kaisha Yaskawa DenkiInventors: Yasushi Yoshida, Yuji Arinaga, Shirou Yoshidomi, Yosuke Yamaguchi, Jiro Muraoka
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Publication number: 20130229138Abstract: Reflected light can be effectively utilized by increasing a light receiving area. Incremental light receiving element groups are separated and arranged in the circumferential direction of a rotating unit while placing a light source therebetween. First and second absolute light receiving element groups are arranged at both sides of the outside and inside of the light source in the radial direction of the rotating unit. As a result, first and second absolute light receiving elements are continuously arranged, and also the incremental light receiving element groups and the absolute light receiving element groups can be arranged to surround the periphery of the light source from four directions.Type: ApplicationFiled: April 22, 2013Publication date: September 5, 2013Applicant: KABUSHIKI KAISHA YASKAWA DENKIInventors: Yasushi YOSHIDA, Yuji ARINAGA, Shirou YOSHIDOMI, Yasuhiro MATSUTANI
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Patent number: 8461790Abstract: The encoder includes a disk in a disk shape that is arranged rotatably about a rotation axis and that includes one track in a ring shape on which a rotating grating is formed and one or more origin detection areas serving as partial areas on which a rotating grating is formed, and a mask that is fixed and arranged in a manner facing the disk and on which one or more fixed gratings are formed so as to constitute a diffraction interference optical system together with the rotating gratings. A plurality of slits and included in at least one rotating grating are formed along a curved line obtained by curving a plurality of radial lines about the rotation axis in the circumferential direction at predetermined curvature such that pitches and of the slits and can be set to a predetermined value.Type: GrantFiled: November 21, 2012Date of Patent: June 11, 2013Assignee: Kabushiki Kaisha Yaskawa DenkiInventors: Yosuke Yamaguchi, Yasushi Yoshida, Shirou Yoshidomi
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Patent number: 8445835Abstract: An encoder includes a disk including a first track and a second track each being ring-shaped and provided with a rotary grating, and a first detector and a second detector that are fixedly disposed so as to respectively face the first track and the second track each provided with a fixed grating that detects diffracted interfering light. A plurality of slits of the first track are formed as curved slits. The first detector facing the first track is disposed at a position where a tangent of each of the slits included in the diffraction grating of the first track becomes parallel to a tangent of each of the slits included in the diffraction grating of the second track at a position where the second detector faces the second track.Type: GrantFiled: January 19, 2011Date of Patent: May 21, 2013Assignee: Kabushiki Kaisha Yaskawa DenkiInventors: Yasushi Yoshida, Shirou Yoshidomi, Jiro Muraoka
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Patent number: 8354815Abstract: An encoder includes: a main scale having two or more band-shaped tracks in each of which an optical main grating is formed so that longitudinal direction of the main scale corresponds to a measurement axis direction; and an index scale opposed to the main scale so as to form a diffraction interference optical system in cooperation with the main grating, disposed so as to be movable relative to the main scale in the measurement axis direction, and in which two or more optical index gratings are formed. A plurality of slits included in the main grating in at least one track are formed so as to be inclined at a predetermined inclination angle from a direction perpendicular to the measurement axis direction so that pitch of the slits in the track becomes equal to the pitch of the slits in the at least one other track.Type: GrantFiled: September 17, 2010Date of Patent: January 15, 2013Assignee: Kabushiki Kaisha Yaskawa DenkiInventors: Yasushi Yoshida, Yuji Arinaga, Shirou Yoshidomi, Yosuke Yamaguchi, Jiro Muraoka
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Publication number: 20120206024Abstract: This disclosure discloses a servo motor manufacturing method, includes a disk position adjusting that adjusts a position of a rotating disk with respect to a shaft, in a case where said rotating disk to which at least one concentric pattern is formed around a disk center is to be fixed to said shaft of a motor, wherein in said disk position adjusting, said concentric pattern is used as a scale of a linear encoder to adjust an eccentricity of said rotating disk.Type: ApplicationFiled: January 16, 2012Publication date: August 16, 2012Applicant: Kabushiki Kaisha Yaskawa DenkiInventors: Yasushi Yoshida, Shirou Yoshidomi, Yosuke Yamaguchi, Yasuhiro Matsutani
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Publication number: 20120205527Abstract: An encoder includes a slit array along a first measurement axis, and an optical module capable of relatively moving with respect to the slit array. The optical module comprises a point light source that irradiates the part of the slit array, and a light receiving array comprising a plurality of light receiving elements along a second measurement axis and arranged in positions offset with respect to the point light source. The light receiving elements is receiving light irradiated from the point light source and reflected from the reflection slit. The plurality of light receiving elements comprises respective shapes such that the light receiving element nearer to the point light source comprises a shorter length in a width direction and end parts on an opposite side of the light receiving element with respect to the point light source are arranged side by side in positions along the second measurement axis.Type: ApplicationFiled: February 8, 2012Publication date: August 16, 2012Applicant: KABUSHIKI KAISHA YASKAWA DENKIInventors: Yasushi YOSHIDA, Shirou YOSHIDOMI, Yasuhiro MATSUTANI, Jiro MURAOKA
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Publication number: 20110298411Abstract: An encoder includes a disk including a first track and a second track each being ring-shaped and provided with a rotary grating, and a first detector and a second detector that are fixedly disposed so as to respectively face the first track and the second track each provided with a fixed grating that detects diffracted interfering light. A plurality of slits of the first track are formed as curved slits. The first detector facing the first track is disposed at a position where a tangent of each of the slits included in the diffraction grating of the first track becomes parallel to a tangent of each of the slits included in the diffraction grating of the second track at a position where the second detector faces the second track.Type: ApplicationFiled: January 19, 2011Publication date: December 8, 2011Applicant: KABUSHIKI KAISHA YASKAWA DENKIInventors: Yasushi YOSHIDA, Shirou Yoshidomi, Jiro Muraoka
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Patent number: 7989998Abstract: With a motor with an encoder of the invention, a stopper gap formed between a stopper formed on an outer circumferential surface of a hub of the encoder and a bearing cover of an anti-load side bracket is set smaller than an encoder gap to prevent that a rotating disk is made contact with a fixed slit even when an excessive force is applied to an output shaft of the motor with the encoder.Type: GrantFiled: August 10, 2009Date of Patent: August 2, 2011Assignee: Kabushiki Kaisha Yaskawa DenkiInventors: Yoshiyuki Nagamatsu, Mitsuhiro Matsuzaki, Yukio Tsutsui, Shirou Yoshidomi
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Publication number: 20110069390Abstract: An encoder includes a disc-shaped disk disposed so as to be rotatable about a rotation axis and having at least one ring-shaped track in which a rotating grating is formed and at least one fixed grating which is fixedly disposed opposed to the disk so that the fixed grating and the rotating grating construct a diffraction interference optical system. Each of a plurality of slits included in the at least one rotating grating is formed along a curved line obtained by making each of a plurality of radial lines using the rotation axis as a center curved in the circumferential direction at a predetermined curve degree so that a pitch of the slits can be set to a predetermined value.Type: ApplicationFiled: September 15, 2010Publication date: March 24, 2011Applicant: KABUSHIKI KAISHA YASKAWA DENKIInventors: Yasushi Yoshida, Yuji Arinaga, Shirou Yoshidomi, Yosuke Yamaguchi, Jiro Muraoka
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Patent number: D690672Type: GrantFiled: April 4, 2012Date of Patent: October 1, 2013Assignee: Kabushiki Kaisha Yaskawa DenkiInventors: Yasushi Yoshida, Shirou Yoshidomi, Yasuhiro Matsutani, Jiro Muraoka