Patents by Inventor Homare TOKIDA
Homare TOKIDA 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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Publication number: 20230089798Abstract: A magnetic sensor includes at least one sensor main body; a detection circuit provided on the at least one sensor main body, the detection circuit including a magnetic detection element; and a plurality of sensor terminals provided on the at least one sensor main body. The plurality of sensor terminals include a plurality of signal terminals and a plurality of power supply terminals. The plurality of signal terminals are all disposed on a side of one end of the at least one sensor main body. The plurality of power supply terminals include at least one first terminal disposed on the side of the one end of the at least one sensor main body, and a plurality of second terminals disposed on a side of another end of the at least one sensor main body.Type: ApplicationFiled: September 19, 2022Publication date: March 23, 2023Applicant: TDK CORPORATIONInventors: Kenkichi ANAGAWA, Shinichirou MOCHIZUKI, Homare TOKIDA
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Patent number: 10648787Abstract: A first, a second, and a third computing circuit respectively generate a first post-computation signal with a second harmonic component reduced as compared with first and second signals, a second post-computation signal with the second harmonic component reduced as compared with third and fourth signals, and a third post-computation signal with the second harmonic component reduced as compared with fifth and sixth signals. A fourth and a fifth computing circuit respectively generate a fourth post-computation signal with a third harmonic component reduced as compared with the first and second post-computation signals, and a fifth post-computation signal with the third harmonic component reduced as compared with the second and third post-computation signals. A sixth computing circuit determines a detected angle value based on the fourth and fifth post-computation signals.Type: GrantFiled: June 27, 2019Date of Patent: May 12, 2020Assignee: TDK CORPORATIONInventors: Yohei Hirota, Homare Tokida, Hiraku Hirabayashi
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Publication number: 20190316894Abstract: A first, a second, and a third computing circuit respectively generate a first post-computation signal with a second harmonic component reduced as compared with first and second signals, a second post-computation signal with the second harmonic component reduced as compared with third and fourth signals, and a third post-computation signal with the second harmonic component reduced as compared with fifth and sixth signals. A fourth and a fifth computing circuit respectively generate a fourth post-computation signal with a third harmonic component reduced as compared with the first and second post-computation signals, and a fifth post-computation signal with the third harmonic component reduced as compared with the second and third post-computation signals. A sixth computing circuit determines a detected angle value based on the fourth and fifth post-computation signals.Type: ApplicationFiled: June 27, 2019Publication date: October 17, 2019Applicant: TDK CORPORATIONInventors: Yohei HIROTA, Homare TOKIDA, Hiraku HIRABAYASHI
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Patent number: 10386169Abstract: A first, a second, and a third computing circuit respectively generate a first post-computation signal with a second harmonic component reduced as compared with first and second signals, a second post-computation signal with the second harmonic component reduced as compared with third and fourth signals, and a third post-computation signal with the second harmonic component reduced as compared with fifth and sixth signals. A fourth and a fifth computing circuit respectively generate a fourth post-computation signal with a third harmonic component reduced as compared with the first and second post-computation signals, and a fifth post-computation signal with the third harmonic component reduced as compared with the second and third post-computation signals. A sixth computing circuit determines a detected angle value based on the fourth and fifth post-computation signals.Type: GrantFiled: June 19, 2014Date of Patent: August 20, 2019Assignee: TDK CORPORATIONInventors: Yohei Hirota, Homare Tokida, Hiraku Hirabayashi
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Patent number: 9389286Abstract: A magnetic sensor includes an MR element and a bias field generation unit. The MR element includes a magnetization pinned layer having a magnetization pinned in a direction parallel to an X direction, a free layer having a magnetization that varies depending on an X-direction component of an external magnetic field, and a nonmagnetic layer interposed between the magnetization pinned layer and the free layer. The magnetization pinned layer, the nonmagnetic layer and the free layer are stacked to be adjacent in a Y direction. The free layer receives an interlayer coupling magnetic field in a direction parallel to the X direction resulting from the magnetization pinned layer. The bias field generation unit applies a bias magnetic field to the free layer. The bias magnetic field includes a first component in a direction opposite to that of the interlayer coupling magnetic field and a second component in a Z direction.Type: GrantFiled: February 25, 2014Date of Patent: July 12, 2016Assignee: TDK CORPORATIONInventors: Hiroshi Yamazaki, Yoshiyuki Mizoguchi, Satoshi Abe, Homare Tokida, Toshiyuki Ayukawa
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Publication number: 20160169707Abstract: A first, a second, and a third computing circuit respectively generate a first post-computation signal with a second harmonic component reduced as compared with first and second signals, a second post-computation signal with the second harmonic component reduced as compared with third and fourth signals, and a third post-computation signal with the second harmonic component reduced as compared with fifth and sixth signals. A fourth and a fifth computing circuit respectively generate a fourth post-computation signal with a third harmonic component reduced as compared with the first and second post-computation signals, and a fifth post-computation signal with the third harmonic component reduced as compared with the second and third post-computation signals. A sixth computing circuit determines a detected angle value based on the fourth and fifth post-computation signals.Type: ApplicationFiled: February 23, 2016Publication date: June 16, 2016Applicant: TDK CORPORATIONInventors: Yohei HIROTA, Homare TOKIDA, Hiraku HIRABAYASHI, Kazuma YAMAWAKI
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Patent number: 9297635Abstract: A magnetic sensor system includes a scale and a magnetic sensor arranged in a relative positional relationship variable in a first direction, and a computing unit. The magnetic sensor includes a first detection circuit disposed at a first position and a second detection circuit disposed at a second position. Each of the first and second detection circuits includes a spin-valve magnetoresistive element. The difference between the first position and the second position in the first direction is smaller than or equal to 1.25% of a one-pitch amount of change in the relative positional relationship between the scale and the magnetic sensor. The computing unit generates an abnormal-event determination signal indicative of the presence of an abnormal event in the magnetic sensor by computation using detection signals from the first and second detection circuits.Type: GrantFiled: January 27, 2014Date of Patent: March 29, 2016Assignee: TDK CORPORATIONInventors: Homare Tokida, Satoshi Abe, Hiroshi Yamazaki, Takahiro Imai
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Patent number: 9244136Abstract: A magnetic sensor includes an MR element and a pair of magnets. The MR element includes a magnetization pinned layer having a magnetization pinned in a direction parallel to an X direction, a free layer having a magnetization that varies depending on an X-direction component of an external magnetic field, and a nonmagnetic layer interposed between the magnetization pinned layer and the free layer. The magnetization pinned layer, the nonmagnetic layer and the free layer are stacked to be adjacent in a Y direction. The free layer receives an interlayer coupling magnetic field in a direction parallel to the X direction resulting from the magnetization pinned layer. The pair of magnets applies a bias magnetic field to the free layer. The bias magnetic field includes a first component in a direction opposite to that of the interlayer coupling magnetic field and a second component in a Z direction.Type: GrantFiled: February 11, 2014Date of Patent: January 26, 2016Assignee: TDK CORPORATIONInventors: Hiroshi Yamazaki, Yoshiyuki Mizoguchi, Takahiro Imai, Satoshi Abe, Homare Tokida
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Patent number: 9200884Abstract: A magnetic sensor system includes a scale and a magnetic sensor arranged in a relative positional relationship variable in a first direction, and a computing unit. The magnetic sensor includes a first detection circuit, a second detection circuit and a third detection circuit that are disposed at a first position, a second position and a third position, respectively. Each of the first to third detection circuits includes a spin-valve MR element. A difference between two of the first to third positions that are the most distant from each other in a first direction falls within a one-pitch amount of change in the relative positional relationship between the scale and the magnetic sensor. The computing unit generates first and second post-computation signals having mutually different phases by computation using detection signals from the first to third detection circuits.Type: GrantFiled: January 27, 2014Date of Patent: December 1, 2015Assignee: TDK CORPORATIONInventors: Kunihiro Ueda, Hiraku Hirabayashi, Satoshi Abe, Homare Tokida
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Publication number: 20150066426Abstract: A first, a second, and a third computing circuit respectively generate a first post-computation signal with a second harmonic component reduced as compared with first and second signals, a second post-computation signal with the second harmonic component reduced as compared with third and fourth signals, and a third post-computation signal with the second harmonic component reduced as compared with fifth and sixth signals. A fourth and a fifth computing circuit respectively generate a fourth post-computation signal with a third harmonic component reduced as compared with the first and second post-computation signals, and a fifth post-computation signal with the third harmonic component reduced as compared with the second and third post-computation signals. A sixth computing circuit determines a detected angle value based on the fourth and fifth post-computation signals.Type: ApplicationFiled: June 19, 2014Publication date: March 5, 2015Inventors: Yohei HIROTA, Homare TOKIDA, Hiraku HIRABAYASHI
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Publication number: 20140292322Abstract: A magnetic sensor includes an MR element and a bias field generation unit. The MR element includes a magnetization pinned layer having a magnetization pinned in a direction parallel to an X direction, a free layer having a magnetization that varies depending on an X-direction component of an external magnetic field, and a nonmagnetic layer interposed between the magnetization pinned layer and the free layer. The magnetization pinned layer, the nonmagnetic layer and the free layer are stacked to be adjacent in a Y direction. The free layer receives an interlayer coupling magnetic field in a direction parallel to the X direction resulting from the magnetization pinned layer. The bias field generation unit applies a bias magnetic field to the free layer. The bias magnetic field includes a first component in a direction opposite to that of the interlayer coupling magnetic field and a second component in a Z direction.Type: ApplicationFiled: February 25, 2014Publication date: October 2, 2014Applicant: TDK CORPORATIONInventors: Hiroshi YAMAZAKI, Yoshiyuki MIZOGUCHI, Satoshi ABE, Homare TOKIDA, Toshiyuki AYUKAWA
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Publication number: 20140292321Abstract: A magnetic sensor includes an MR element and a pair of magnets. The MR element includes a magnetization pinned layer having a magnetization pinned in a direction parallel to an X direction, a free layer having a magnetization that varies depending on an X-direction component of an external magnetic field, and a nonmagnetic layer interposed between the magnetization pinned layer and the free layer. The magnetization pinned layer, the nonmagnetic layer and the free layer are stacked to be adjacent in a Y direction. The free layer receives an interlayer coupling magnetic field in a direction parallel to the X direction resulting from the magnetization pinned layer. The pair of magnets applies a bias magnetic field to the free layer. The bias magnetic field includes a first component in a direction opposite to that of the interlayer coupling magnetic field and a second component in a Z direction.Type: ApplicationFiled: February 11, 2014Publication date: October 2, 2014Applicant: TDK CORPORATIONInventors: Hiroshi YAMAZAKI, Yoshiyuki MIZOGUCHI, Takahiro IMAI, Satoshi ABE, Homare TOKIDA
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Publication number: 20140292314Abstract: A magnetic sensor system includes a scale and a magnetic sensor arranged in a relative positional relationship variable in a first direction, and a computing unit. The magnetic sensor includes a first detection circuit disposed at a first position and a second detection circuit disposed at a second position. Each of the first and second detection circuits includes a spin-valve magnetoresistive element. The difference between the first position and the second position in the first direction is smaller than or equal to 1.25% of a one-pitch amount of change in the relative positional relationship between the scale and the magnetic sensor. The computing unit generates an abnormal-event determination signal indicative of the presence of an abnormal event in the magnetic sensor by computation using detection signals from the first and second detection circuits.Type: ApplicationFiled: January 27, 2014Publication date: October 2, 2014Applicant: TDK CORPORATIONInventors: Homare TOKIDA, Satoshi ABE, Hiroshi YAMAZAKI, Takahiro IMAI
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Publication number: 20140292313Abstract: A magnetic sensor system includes a scale and a magnetic sensor arranged in a relative positional relationship variable in a first direction, and a computing unit. The magnetic sensor includes a first detection circuit, a second detection circuit and a third detection circuit that are disposed at a first position, a second position and a third position, respectively. Each of the first to third detection circuits includes a spin-valve MR element. A difference between two of the first to third positions that are the most distant from each other in a first direction falls within a one-pitch amount of change in the relative positional relationship between the scale and the magnetic sensor. The computing unit generates first and second post-computation signals having mutually different phases by computation using detection signals from the first to third detection circuits.Type: ApplicationFiled: January 27, 2014Publication date: October 2, 2014Applicant: TDK CORPORATIONInventors: Kunihiro UEDA, Hiraku HIRABAYASHI, Satoshi ABE, Homare TOKIDA