Patents by Inventor Masashi Miwa
Masashi Miwa 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: 11971540Abstract: An optical system (LS) includes lenses (L22,L23) satisfying the following conditional expressions, ndLZ+(0.01425×?dLZ)<2.12, and ?dLZ<35.0, where ndLZ: a refractive index of the lens with reference to d-line, and ?dLZ: Abbe number of the lens with reference to d-line.Type: GrantFiled: December 15, 2017Date of Patent: April 30, 2024Assignee: Nikon CorporationInventors: Masashi Yamashita, Tomoki Ito, Hiroshi Yabumoto, Hiroshi Yamamoto, Satoshi Miwa, Keisuke Tsubonoya, Ayumu Makida, Takeru Uehara
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Publication number: 20240025345Abstract: A vehicle step device includes: a step portion that is attached to a side of a vehicle and is deployed from a retracted position to a getting-on/off position when an occupant gets on and off the vehicle; and a drive unit configured to drive the step portion between the retracted position and the getting-on/off position. The drive unit deploys the step portion to a traveling position located outward of the retracted position in a vehicle width direction when a predetermined condition is satisfied in a vehicle traveling state.Type: ApplicationFiled: July 13, 2023Publication date: January 25, 2024Applicant: AISIN CORPORATIONInventors: Kimihiro SEKINE, Masashi MIWA, Ryota TACHI
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Publication number: 20230391263Abstract: A step apparatus for a vehicle includes: an arm rotatably provided on a base; and a step supported by the arm and movably provided, by rotation of the arm, between a deployed position and a stowed position located at an inner side of a vehicle width direction with respect to the deployed position. The step apparatus for a vehicle is in, by the rotation of the arm, a deployed state in which the step is disposed at the deployed position and the step is to be used or a stowed state in which the step is disposed at the stowed position and stowed under a vehicle body. At least one of the step and the base includes a contact portion to be brought into contact with the other one. The contact portion is provided to contact the other one of the step and the base when the step is disposed at the stowed position.Type: ApplicationFiled: November 9, 2021Publication date: December 7, 2023Applicant: AISIN CORPORATIONInventors: Masashi MIWA, Atsushi MURAMATSU, Natsuki ITO, Takahisa KOBAYASHI, Norio KATO, Kimihiro KINOSHITA
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Publication number: 20230391264Abstract: A step apparatus for a vehicle includes a base attached to an outer side of a vehicle body, an arm rotatably provided on the base, and a step supported by the arm and movable with respect to the base. The step apparatus for a vehicle is in, by rotation of the arm, a deployed state in which the step is to be used or a stowed state in which the step is stowed under the vehicle body. A first rotation axis of a base end of the arm and a second rotation axis of a tip end of the arm are inclined upward toward an outer side of a vehicle width direction in an attached state in which the step apparatus for a vehicle is attached to the vehicle body.Type: ApplicationFiled: November 9, 2021Publication date: December 7, 2023Applicant: AISIN CORPORATIONInventors: Masashi MIWA, Atsushi MURAMATSU, Natsuki ITO, Takahisa KOBAYASHI, Norio KATO, Kimihiro KINOSHITA
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Patent number: 11742119Abstract: Provided is a permanent magnet including a rare-earth element R (such as Nd), a transition metal element T (such as Fe), B, Zr, and Cu. The permanent magnet contains a plurality of main phase grains including Nd, T, and B, and grain boundary multiple junctions, the one grain boundary multiple junction is a grain boundary surrounded by three or more of the main phase grains, one of the grain boundary multiple junctions contains a ZrB2 crystal and an R—Cu-rich phase including R and Cu, Fe is contained in the ZrB2 crystal, a total concentration of Nd and Pr in the one grain boundary multiple junction containing both the ZrB2 crystal and the R—Cu-rich phase is higher than a total concentration of Nd and Pr in the main phase grain, a concentration of Cu in the one grain boundary multiple junction containing both the ZrB2 crystal and the R—Cu-rich phase is higher than a concentration of Cu in the main phase grain, and a unit of the concentration of each of Nd, Pr, and Cu is atomic %.Type: GrantFiled: March 16, 2021Date of Patent: August 29, 2023Assignee: TDK CorporationInventors: Masashi Miwa, Yoshitomo Tanaka, Koji Miura, Taeko Tsubokura
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Patent number: 11661769Abstract: To provide an emergency release device of a lock system capable of opening a trunk lid using an emergency release lever, the emergency release lever is manipulatable between a first position for placing a pawl in an engagement position and a second position for placing the pawl in a non-engagement position from the inner side of the trunk and is biased toward the first position. An anti-return mechanism prevents the emergency release lever from returning from the second position to the first position when the emergency release lever is manipulated from the first position to the second position.Type: GrantFiled: January 28, 2019Date of Patent: May 30, 2023Assignee: AISIN CORPORATIONInventor: Masashi Miwa
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Patent number: 11657934Abstract: An R-T-B based permanent magnet, excellent in magnetic properties relatively reducing amount of heavy rare earth element used, wherein R represents rare earth element, T iron group element and B boron, includes main phase grains including R2T14B crystal phase and grain boundaries between main phase grains. Grain boundaries include R—O—C—N concentrated parts where concentrations of R, O, C and N are all higher than in main phase grains. O/R(S)>O/R(C) wherein O/R(S) represents O/R ratio (atomic ratio) in R—O—C—N concentrated parts in a surface of an R-T-B based permanent magnet and O/R(C) represents O/R ratio (atomic ratio) in R—O—C—N concentrated parts in a center of an R-T-B based permanent magnet. A heavy rare earth element RH is in a surface of an R-T-B based permanent magnet as R. R—O—C—N concentrated parts in a surface of an R-T-B based permanent magnet have RH/R ratio (atomic ratio) of 0.2 or less.Type: GrantFiled: March 28, 2019Date of Patent: May 23, 2023Assignee: TDK CORPORATIONInventors: Yuki Nagamine, Masashi Miwa, Yoshinori Fujikawa
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Patent number: 11636962Abstract: Provided is a permanent magnet including a rare-earth element R, a transition metal element T, B, Zr, and Cu. The permanent magnet contains main phase grains including Nd, T, and B, and grain boundary multiple junctions, the grain boundary multiple junction is a grain boundary surrounded by three or more of the main phase grains, one of the grain boundary multiple junctions contains a ZrB2 crystal and an R—Cu-rich phase, a concentration of B in the grain boundary multiple junction containing both the ZrB2 crystal and the R—Cu-rich phase is from 5 to 20 atomic %, a concentration of Cu in the grain boundary multiple junction containing both the ZrB2 crystal and the R—Cu-rich phase is from 5 to 25 atomic %, and a surface layer part of the main phase grain includes at least one kind of heavy rare-earth element among Tb and Dy.Type: GrantFiled: March 16, 2021Date of Patent: April 25, 2023Assignee: TDK CorporationInventors: Masashi Miwa, Koji Miura, Taeko Tsubokura
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Patent number: 11410804Abstract: A permanent magnet 2 includes Nd, Fe, and B, the permanent magnet 2 contains a plurality of main phase grains; and grain boundaries positioned between the main phase grains, the main phase grains include Nd, Fe, and B, at least a portion of the grain boundaries contains an R?—O—C phase, the R?—O—C phase includes a rare earth element R?, O, and C, the concentration of each of R?, O, and C in the R?—O—C phase is higher compared to the main phase grains, the permanent magnet 2 comprises a surface layer portion 21 and a central portion 22, the surface layer portion 21 is positioned on the surface side of the permanent magnet 2, the central portion 22 is positioned on the inner side of the permanent magnet 2, the proportion of the area of the R?—O—C phase occupying in a cross-section of the surface layer portion 21 is S1 %, the proportion of the area of the R?—O—C phase occupying in a cross-section of the central portion 22 is S2%, and S1 is higher than S2.Type: GrantFiled: March 14, 2020Date of Patent: August 9, 2022Assignee: TDK CorporationInventor: Masashi Miwa
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Publication number: 20210407714Abstract: To provide an R-T-B based permanent magnet having a high residual magnetic flux density Br at room temperature and a high coercivity HcJ at high temperature. In the R-T-B based permanent magnet, R is a rare earth element, T is an iron group element, and B is boron, and the R-T-B based permanent magnet includes a light rare earth element and a heavy rare earth element as R. The R-T-B based permanent magnet further includes Al, Ga, and Zr. With respect to 100 mass % of the R-T-B based permanent magnet, a total content of R is 28.50 mass % to 30.25 mass % (not including 28.50 mass %), B content is 0.93 mass % to 0.98 mass %, Al content is 0.03 mass % to 0.19 mass %, Ga content is 0.03 mass % to 0.15 mass %, and Zr content is 0.30 mass % to 0.50 mass %.Type: ApplicationFiled: June 23, 2021Publication date: December 30, 2021Applicant: TDK CORPORATIONInventors: Koji MIURA, Masashi MIWA
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Patent number: 11152142Abstract: An R-T-B based permanent magnet excellent in magnetic properties relatively reduces the amount of a heavy rare earth element used. An R-T-B based permanent magnet, wherein R represents a rare earth element, T an iron group element and B boron, includes main phase grains including an R2T14B crystal phase and grain boundaries formed between main phase grains. Grain boundaries include R—O—C—N concentrated parts where concentrations of R, O, C and N are all higher than those in main phase grains. C/R(S)>C/R(C) is satisfied in which C/R(S) represents a C/R ratio (atomic ratio) in R—O—C—N concentrated parts present in a surface of a R-T-B based permanent magnet and C/R(C) represents a C/R ratio (atomic ratio) in the R—O—C—N concentrated parts present in the center of a R-T-B based permanent magnet, and a heavy rare earth element RH is included in the R-T-B based permanent magnet.Type: GrantFiled: March 28, 2019Date of Patent: October 19, 2021Assignee: TDK CORPORATIONInventors: Yuki Nagamine, Masashi Miwa, Yoshinori Fujikawa
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Patent number: 11145444Abstract: An R-T-B-based sintered magnet 2 contains a rare earth element R, a transition metal element T, B, Ga, and O, the sintered magnet 2 includes a magnet body 4 and an oxidized layer 6 covering the magnet body 4, the magnet body 4 includes main phase grains 8 containing a crystal of R2T14B and a grain boundary phase 1 positioned between the main phase grains 8 and containing R, the oxidized layer 6 includes a plurality of oxide phases 3A containing R, T, Ga, and O, the oxide phase 3A satisfies the following Formulas (1) and (2) regarding the content (unit: atom %) of each element, and the oxide phase 3A in the oxidized layer 6 covers the grain boundary phase 1 in the magnet body 4. 0.3?[R]/[T]?0.5??(1) 0.2?[O]/([R]+[T]+[Ga]+[O])?0.Type: GrantFiled: March 26, 2019Date of Patent: October 12, 2021Assignee: TDK CorporationInventors: Mariko Fujiwara, Masashi Miwa
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Publication number: 20210313099Abstract: Provided is a permanent magnet including a rare-earth element R (such as Nd), a transition metal element T (such as Fe), B, Zr, and Cu. The permanent magnet contains a plurality of main phase grains including Nd, T, and B, and grain boundary multiple junctions, the one grain boundary multiple junction is a grain boundary surrounded by three or more of the main phase grains, one of the grain boundary multiple junctions contains a ZrB2 crystal and an R—Cu-rich phase including R and Cu, a concentration of B in the one grain boundary multiple junction containing both the ZrB2 crystal and the R—Cu-rich phase is from 5 to 20 atomic %, a concentration of Cu in the one grain boundary multiple junction containing both the ZrB2 crystal and the R—Cu-rich phase is from 5 to 25 atomic %, and a surface layer part of the main phase grain includes at least one kind of heavy rare-earth element among Tb and Dy.Type: ApplicationFiled: March 16, 2021Publication date: October 7, 2021Applicant: TDK CorporationInventors: Masashi MIWA, Koji MIURA, Taeko TSUBOKURA
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Publication number: 20210304929Abstract: Provided is a permanent magnet including a rare-earth element R (such as Nd), a transition metal element T (such as Fe), B, Zr, and Cu. The permanent magnet contains a plurality of main phase grains including Nd, T, and B, and grain boundary multiple junctions, the one grain boundary multiple junction is a grain boundary surrounded by three or more of the main phase grains, one of the grain boundary multiple junctions contains a ZrB2 crystal and an R—Cu-rich phase including R and Cu, Fe is contained in the ZrB2 crystal, a total concentration of Nd and Pr in the one grain boundary multiple junction containing both the ZrB2 crystal and the R—Cu-rich phase is higher than a total concentration of Nd and Pr in the main phase grain, a concentration of Cu in the one grain boundary multiple junction containing both the ZrB2 crystal and the R—Cu-rich phase is higher than a concentration of Cu in the main phase grain, and a unit of the concentration of each of Nd, Pr, and Cu is atomic %.Type: ApplicationFiled: March 16, 2021Publication date: September 30, 2021Applicant: TDK CorporationInventors: Masashi MIWA, Yoshitomo TANAKA, Koji MIURA, Taeko TSUBOKURA
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Patent number: 10943717Abstract: An R-T-B based permanent magnet includes main phase grains composed of R2T14B type compound. R is a rare earth element. T is iron group element(s) essentially including Fe or Fe and Co. B is boron. An average grain size of the main phase grains is 0.8 ?m or more and 2.8 ?m or less. The R-T-B based permanent magnet contains at least C and Zr in addition to R, T, and B. B is contained at 0.75 mass % or more and 0.88 mass % or less. Zr is contained at 0.65 mass % or more and 5.00 mass % or less. A formula (1) of 5.0?[B]+[C]?[Zr]?5.6 is satisfied, where [B] is a B content represented by atom %, [C] is a C content represented by atom %, and [Zr] is a Zr content represented by atom %.Type: GrantFiled: February 23, 2017Date of Patent: March 9, 2021Assignee: TDK CORPORATIONInventors: Masashi Miwa, Takurou Iwasa
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Publication number: 20200303102Abstract: A permanent magnet 2 includes Nd, Fe, and B, the permanent magnet 2 contains a plurality of main phase grains; and grain boundaries positioned between the main phase grains, the main phase grains include Nd, Fe, and B, at least a portion of the grain boundaries contains an R?—O—C phase, the R?—O—C phase includes a rare earth element R?, O, and C, the concentration of each of R?, O, and C in the R?—O—C phase is higher compared to the main phase grains, the permanent magnet 2 comprises a surface layer portion 21 and a central portion 22, the surface layer portion 21 is positioned on the surface side of the permanent magnet 2, the central portion 22 is positioned on the inner side of the permanent magnet 2, the proportion of the area of the R?—O—C phase occupying in a cross-section of the surface layer portion 21 is S1 %, the proportion of the area of the R?—O—C phase occupying in a cross-section of the central portion 22 is S2%, and S1 is higher than S2.Type: ApplicationFiled: March 14, 2020Publication date: September 24, 2020Applicant: TDK CorporationInventor: Masashi MIWA
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Patent number: 10784028Abstract: An R-T-B based permanent magnet includes main phase grains composed of R2T14B type compound. R is a rare earth element. T is iron group element(s) essentially including Fe or Fe and Co. B is boron. An average grain size of the main phase grains is 0.8 ?m to 2.8 ?m. The R-T-B based permanent magnet contains at least C and Ga in addition to R, T, and B. B is contained at 0.71 mass % to 0.86 mass %. C is contained at 0.13 mass % to 0.34 mass %. Ga is contained at 0.40 mass % to 1.80 mass %. A formula (1) of 0.14?[C]/([B]+[C])?0.30 is satisfied, where [B] is a B content represented by atom %, and [C] is a C content represented by atom %.Type: GrantFiled: February 23, 2017Date of Patent: September 22, 2020Assignee: TDK CORPORATIONInventors: Tamotsu Ishiyama, Masashi Miwa, Takashi Watanabe
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Patent number: 10748686Abstract: An R-T-B based sintered magnet including a plural number of main phase particles having an R2T14B type crystal structure. R is at least one rare earth element essentially including heavy rare earth elements RH, T is at least one transition metal element essentially including Fe or Fe and Co, and B is boron. At least one of the main phase particles is a reverse core-shell main phase particle including a core part and a shell part, in which CRC/CRS>1.0 is satisfied when a total RH concentration (at %) in the core part is defined as CRC and a total RH concentration (at %) in the shell part is defined as CRS. An existence ratio of the reverse core-shell main phase particles is larger in a surface layer part of the magnet than in a central part of the magnet.Type: GrantFiled: March 29, 2018Date of Patent: August 18, 2020Assignee: TDK CORPORATIONInventors: Yoshinori Fujikawa, Masashi Miwa
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Patent number: 10748685Abstract: An R-T-B based sintered magnet including main phase particles having an R2T14B type crystal structure. R is at least one rare earth element essentially including a heavy rare-earth element RH. T is at least one transition metal element essentially including Fe or Fe and Co. B is boron. At least one of the main phase particles includes low RH crystal phases inside the main phase particle. The low RH crystal phases include the R2T14B type crystal structure, wherein an RH concentration in the low RH crystal phases is relatively lower than the RH concentration in the whole main phase particles. The R-T-B based sintered magnet may satisfy rs?rc?20% when an existence ratio of the main phase particles including the low RH crystal phases in a magnet surface layer part is rs (%) and the same in a magnet central part is rc (%).Type: GrantFiled: March 29, 2018Date of Patent: August 18, 2020Assignee: TDK CORPORATIONInventors: Yoshinori Fujikawa, Masashi Miwa
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Patent number: D983716Type: GrantFiled: May 7, 2021Date of Patent: April 18, 2023Assignee: AISIN CORPORATIONInventors: Masashi Miwa, Takahisa Kobayashi, Norio Kato, Kimihiro Kinoshita