Patents by Inventor Mikio Shimada
Mikio Shimada 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: 11647677Abstract: Provided is a piezoelectric ceramics including crystal grains each including: a first region that is formed of a perovskite-type metal oxide having a crystal structure in which a central element of a unit cell is located at an asymmetrical position; and a second region that is formed of a perovskite-type metal oxide having a crystal structure in which a central element of a unit cell is located at a symmetrical position, and that is present inside the first region, wherein a ratio of a cross-sectional area of the second region to a cross-sectional area of the piezoelectric ceramics is 0.1% or less.Type: GrantFiled: May 29, 2019Date of Patent: May 9, 2023Assignee: CANON KABUSHIKI KAISHAInventors: Akira Uebayashi, Kanako Oshima, Makoto Kubota, Tatsuo Furuta, Yasushi Shimizu, Mikio Shimada, Chiaki Arii
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Publication number: 20190378970Abstract: Provided is a piezoelectric ceramics including crystal grains each including: a first region that is formed of a perovskite-type metal oxide having a crystal structure in which a central element of a unit cell is located at an asymmetrical position; and a second region that is formed of a perovskite-type metal oxide having a crystal structure in which a central element of a unit cell is located at a symmetrical position, and that is present inside the first region, wherein a ratio of a cross-sectional area of the second region to a cross-sectional area of the piezoelectric ceramics is 0.1% or less.Type: ApplicationFiled: May 29, 2019Publication date: December 12, 2019Inventors: Akira Uebayashi, Kanako Oshima, Makoto Kubota, Tatsuo Furuta, Yasushi Shimizu, Mikio Shimada, Chiaki Arii
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Patent number: 9842985Abstract: Provided are a barium titanate-based piezoelectric ceramics having satisfactory piezoelectric performance and a satisfactory mechanical quality factor (Qm), and a piezoelectric element using the same. Specifically provided are a piezoelectric ceramics, including: crystal particles; and a grain boundary between the crystal particles, in which the crystal particles each include barium titanate having a perovskite-type structure and manganese at 0.04% by mass or more and 0.20% by mass or less in terms of a metal with respect to the barium titanate, and the grain boundary includes at least one compound selected from the group consisting of Ba4Ti12O27 and Ba6Ti17O40, and a piezoelectric element using the same.Type: GrantFiled: December 7, 2015Date of Patent: December 12, 2017Assignee: CANON KABUSHIKI KAISHAInventors: Tatsuya Suzuki, Masami Tsukamoto, Mikio Shimada, Toshihiro Ifuku, Takanori Matsuda, Makoto Kubota, Jumpei Hayashi
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Patent number: 9825213Abstract: A piezoelectric element having an improved piezoelectric constant is provided, and a liquid discharge head, an ultrasonic motor, and a dust removing device, each of which uses the above piezoelectric element, are also provided. A piezoelectric element at least includes a pair of electrodes and a piezoelectric material provided in contact with the pair of electrodes, the piezoelectric material is formed of an aggregate of crystal grains containing barium titanate as a primary component, and among the crystal grains of the aggregate, crystal grains at least in contact with the electrodes have dislocation layers in the grains. A liquid discharge head, an ultrasonic motor, and a dust removing device each use the above piezoelectric element.Type: GrantFiled: December 22, 2011Date of Patent: November 21, 2017Assignee: Canon Kabushiki KaishaInventors: Mikio Shimada, Toshiaki Aiba, Toshihiro Ifuku, Takanori Matsuda, Takayuki Watanabe
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Patent number: 9698337Abstract: A piezoelectric ceramic includes: a metal oxide represented by General Formula (1); and 0.04 parts by weight or more and 0.36 parts by weight or less of Mn and 0.042 parts by weight or more and 0.850 parts by weight or less of Bi on a metal basis relative to 100 parts by weight of the metal oxide, wherein the piezoelectric ceramic includes a plurality of first crystal grains having a perovskite structure, and a plurality of second crystal grains provided at a grain boundary between the first crystal grains and having a crystal structure different from that of the first crystal grain, and the second crystal grain mainly contains at least one metal oxide selected from Ba4Ti12O27 and Ba6Ti17O40. (Ba1-xCax)a(Ti1-yZry)O3??(1) (where 0.09?x?0.30, 0.025?y?0.085, 0.986?a?1.Type: GrantFiled: January 6, 2016Date of Patent: July 4, 2017Assignee: Canon Kabushiki KaishaInventors: Kanako Oshima, Masatoshi Watanabe, Tatsuya Suzuki, Mikio Shimada, Shinya Koyama, Yasushi Shimizu, Tatsuo Furuta, Hidenori Tanaka, Makoto Kubota, Jumpei Hayashi
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Publication number: 20170101345Abstract: Provided is a lead-free piezoelectric ceramics having enhanced mechanical quality factor (Qm) and mechanical strength. The piezoelectric ceramics, includes at least a first crystal grain and a second crystal grain. The first crystal grain has an average equivalent circle diameter of 2 ?m or more and 30 ?m or less. The first crystal grain includes a perovskite-type metal oxide represented by the following general formula (1) as a main component, and the second crystal grain includes a perovskite-type metal oxide represented by the following general formula (2) as a main component: (1) xBaTiO3-yCaTiO3-zCaZrO3; and (2) x?BaTiO3-y?CaTiO3-z?CaZrO3, provided that x, y, z, x?, y?, and z? satisfy x+y+z=1, x?+y?+z?=1, 0?x??0.15, 0.85?y??1, 0?z??0.05, x>x?, 0<y<y?, and z>0.Type: ApplicationFiled: July 1, 2016Publication date: April 13, 2017Inventors: Mikio Shimada, Toshiaki Aiba, Toshihiro Ifuku, Takanori Matsuda, Makoto Kubota, Tatsuo Furuta, Jumpei Hayashi
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Patent number: 9541854Abstract: Provided is an electroconductive member configured to suppress a void image caused by abnormal discharge and a horizontal streak-like image caused by downstream discharge without depending on the thickness of a photosensitive layer of a photosensitive drum over a long period of time. The electroconductive member for electrophotography comprises at least an electroconductive support and a surface layer formed on an outer side of the electroconductive support. The surface layer includes a porous body and satisfies the predetermined (1), (2), and (3).Type: GrantFiled: March 23, 2015Date of Patent: January 10, 2017Assignee: CANON KABUSHIKI KAISHAInventors: Yuichi Kikuchi, Kazuhiro Yamauchi, Mikio Shimada, Tetsuo Hino, Masahiro Watanabe, Norifumi Muranaka, Satoru Nishioka
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Patent number: 9461238Abstract: Provided are a piezoelectric thin film having good piezoelectricity in which a rhombohedral structure and a tetragonal structure are mixed, and a piezoelectric element using the piezoelectric thin film. The piezoelectric thin film includes a perovskite type metal oxide, in which the perovskite type metal oxide is a mixed crystal system of at least a rhombohedral structure and a tetragonal structure, and a ratio between an a-axis lattice parameter and a c-axis lattice parameter of the tetragonal structure satisfies 1.15?c/a?1.30. The piezoelectric element includes on a substrate: the above-mentioned piezoelectric thin film; and a pair of electrodes provided in contact with the piezoelectric thin film.Type: GrantFiled: February 28, 2011Date of Patent: October 4, 2016Assignees: CANON KABUSHIKI KAISHA, KYOTO UNIVERSITYInventors: Makoto Kubota, Kenichi Takeda, Jumpei Hayashi, Mikio Shimada, Yuichi Shimakawa, Masaki Azuma, Yoshitaka Nakamura, Masanori Kawai
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Patent number: 9412931Abstract: Provided is a lead-free piezoelectric ceramics having enhanced mechanical quality factor (Qm) and mechanical strength. The piezoelectric ceramics, includes at least a first crystal grain and a second crystal grain. The first crystal grain has an average equivalent circle diameter of 2 ?m or more and 30 ?m or less. The first crystal grain includes a perovskite-type metal oxide represented by the following general formula (1) as a main component, and the second crystal grain includes a perovskite-type metal oxide represented by the following general formula (2) as a main component: (1) xBaTiO3-yCaTiO3-zCaZrO3; and (2) x?BaTiO3-y?CaTiO3-z?CaZrO3, provided that x, y, z, x?, y?, and z? satisfy x+y+z=1, x?+y?+z?=1, 0?x??0.15, 0.85?y??1, 0?z?0.05, x>x?, 0<y<y?, and z>0.Type: GrantFiled: March 26, 2013Date of Patent: August 9, 2016Assignee: CANON KABUSHIKI KAISHAInventors: Mikio Shimada, Toshiaki Aiba, Toshihiro Ifuku, Takanori Matsuda, Makoto Kubota, Tatsuo Furuta, Jumpei Hayashi
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Publication number: 20160204335Abstract: A piezoelectric ceramic includes: a metal oxide represented by General Formula (1); and 0.04 parts by weight or more and 0.36 parts by weight or less of Mn and 0.042 parts by weight or more and 0.850 parts by weight or less of Bi on a metal basis relative to 100 parts by weight of the metal oxide, wherein the piezoelectric ceramic includes a plurality of first crystal grains having a perovskite structure, and a plurality of second crystal grains provided at a grain boundary between the first crystal grains and having a crystal structure different from that of the first crystal grain, and the second crystal grain mainly contains at least one metal oxide selected from Ba4Ti12O27 and Ba6Ti17O40. (Ba1-xCax)a(Ti1-yZry)O3??(1) (where 0.09?x?0.30, 0.025?y?0.085, 0.986?a?1.Type: ApplicationFiled: January 6, 2016Publication date: July 14, 2016Inventors: Kanako Oshima, Masatoshi Watanabe, Tatsuya Suzuki, Mikio Shimada, Shinya Koyama, Yasushi Shimizu, Tatsuo Furuta, Hidenori Tanaka, Makoto Kubota, Jumpei Hayashi
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Publication number: 20160104833Abstract: Provided are a barium titanate-based piezoelectric ceramics having satisfactory piezoelectric performance and a satisfactory mechanical quality factor (Qm), and a piezoelectric element using the same. Specifically provided are a piezoelectric ceramics, including: crystal particles; and a grain boundary between the crystal particles, in which the crystal particles each include barium titanate having a perovskite-type structure and manganese at 0.04% by mass or more and 0.20% by mass or less in terms of a metal with respect to the barium titanate, and the grain boundary includes at least one compound selected from the group consisting of Ba4Ti12O27 and Ba6Ti17O40, and a piezoelectric element using the same.Type: ApplicationFiled: December 7, 2015Publication date: April 14, 2016Inventors: Tatsuya Suzuki, Masami Tsukamoto, Mikio Shimada, Toshihiro Ifuku, Takanori Matsuda, Makoto Kubota, Jumpei Hayashi
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Patent number: 9306149Abstract: Provided is a piezoelectric material that achieves both high piezoelectric performance and high Curie temperature. In addition, provided are a piezoelectric element, a liquid discharge head, an ultrasonic motor, and a dust removing device, which use the piezoelectric material. The piezoelectric material includes a perovskite-type metal oxide that is expressed by the following general formula (1): xBaTiO3-yBiFeO3-zBi(M0.5Ti0.5)O3 (1), where M represents at least one type of element selected from the group consisting of Mg and Ni, x satisfies 0.25?x?0.75, y satisfies 0.15?y?0.70, z satisfies 0.05?z?0.60, and x+y+z=1 is satisfied.Type: GrantFiled: December 22, 2011Date of Patent: April 5, 2016Assignees: Canon Kabushiki Kaisha, University of YamanashiInventors: Jumpei Hayashi, Hisato Yabuta, Makoto Kubota, Mikio Shimada, Satoshi Wada, Ichiro Fujii, Ryuta Mitsui, Nobuhiro Kumada
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Patent number: 9231188Abstract: Provided are a barium titanate-based piezoelectric ceramics having satisfactory piezoelectric performance and a satisfactory mechanical quality factor (Qm), and a piezoelectric element using the same. Specifically provided are a piezoelectric ceramics, including: crystal particles; and a grain boundary between the crystal particles, in which the crystal particles each include barium titanate having a perovskite-type structure and manganese at 0.04% by mass or more and 0.20% by mass or less in terms of a metal with respect to the barium titanate, and the grain boundary includes at least one compound selected from the group consisting of Ba4Ti12O27 and Ba6Ti17O40, and a piezoelectric element using the same.Type: GrantFiled: December 15, 2011Date of Patent: January 5, 2016Assignee: Canon Kabushiki KaishaInventors: Tatsuya Suzuki, Masami Tsukamoto, Mikio Shimada, Toshihiro Ifuku, Takanori Matsuda, Makoto Kubota, Jumpei Hayashi
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Patent number: 9146482Abstract: It is an object of the present invention to provide an electroconductive member for electrophotography capable of suppressing image density unevenness caused by the adhesion of foreign matter. Provided is an electroconductive member for electrophotography, including at least: an electroconductive support, and a surface layer formed on an outer side of the electroconductive support, in which the surface layer includes a porous body, and in which the porous body satisfies the following conditions (1) to (3): (1) the porous body has a co-continuous structure including at least a skeleton that is three-dimensionally continuous and a pore that is three-dimensionally continuous; (2) the porous body has electroconductivity; and (3) an average diameter of a maximum inscribed circle of an opening of the pore on a surface of the porous body is 3 ?m or more and 8 ?m or less.Type: GrantFiled: January 21, 2015Date of Patent: September 29, 2015Assignee: CANON KABUSHIKI KAISHAInventors: Masahiro Watanabe, Yuichi Kikuchi, Kazuhiro Yamauchi, Satoru Nishioka, Norifumi Muranaka, Mikio Shimada, Tetsuo Hino
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Publication number: 20150198905Abstract: Provided is an electroconductive member configured to suppress a void image caused by abnormal discharge and a horizontal streak-like image caused by downstream discharge without depending on the thickness of a photosensitive layer of a photosensitive drum over a long period of time. The electroconductive member for electrophotography comprises at least an electroconductive support and a surface layer formed on an outer side of the electroconductive support. The surface layer includes a porous body and satisfies the predetermined (1), (2), and (3).Type: ApplicationFiled: March 23, 2015Publication date: July 16, 2015Inventors: Yuichi Kikuchi, Kazuhiro Yamauchi, Mikio Shimada, Tetsuo Hino, Masahiro Watanabe, Norifumi Muranaka, Satoru Nishioka
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Patent number: 9051191Abstract: Provided is a lead-free dielectric ceramics having a low leakage current value, and a bismuth iron oxide powder as a raw material thereof. The bismuth iron oxide powder includes at least: (A) grains including a bismuth iron oxide having a perovskite-type crystal structure; (B) grains including a bismuth iron oxide having a crystal structure classified to a space group Pbam; and (C) grains including a bismuth iron oxide or a bismuth oxide having a crystal structure that is classified to a space group I23. The dielectric ceramics are made of bismuth iron oxide in which the bismuth iron oxide crystals having the crystal structure classified to the space group Pbam are distributed at a grain boundary of crystal grains of the bismuth iron oxide crystals having the perovskite-type crystal structure.Type: GrantFiled: February 27, 2014Date of Patent: June 9, 2015Assignees: Canon Kabushiki Kaisha, Fuji Chemical Co., Ltd.Inventors: Hisato Yabuta, Makoto Kubota, Mikio Shimada, Kenji Takashima, Fumio Uchida, Kenji Maeda, Chiemi Shimizu
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Publication number: 20150132024Abstract: It is an object of the present invention to provide an electroconductive member for electrophotography capable of suppressing image density unevenness caused by the adhesion of foreign matter. Provided is an electroconductive member for electrophotography, including at least: an electroconductive support, and a surface layer formed on an outer side of the electroconductive support, in which the surface layer includes a porous body, and in which the porous body satisfies the following conditions (1) to (3): (1) the porous body has a co-continuous structure including at least a skeleton that is three-dimensionally continuous and a pore that is three-dimensionally continuous; (2) the porous body has electroconductivity; and (3) an average diameter of a maximum inscribed circle of an opening of the pore on a surface of the porous body is 3 ?m or more and 8 ?m or less.Type: ApplicationFiled: January 21, 2015Publication date: May 14, 2015Inventors: Masahiro Watanabe, Yuichi Kikuchi, Kazuhiro Yamauchi, Satoru Nishioka, Norifumi Muranaka, Mikio Shimada, Tetsuo Hino
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Publication number: 20150028249Abstract: Provided is a lead-free piezoelectric ceramics having enhanced mechanical quality factor (Qm) and mechanical strength. The piezoelectric ceramics, includes at least a first crystal grain and a second crystal grain. The first crystal grain has an average equivalent circle diameter of 2 ?m or more and 30 ?m or less. The first crystal grain includes a perovskite-type metal oxide represented by the following general formula (1) as a main component, and the second crystal grain includes a perovskite-type metal oxide represented by the following general formula (2) as a main component: (1) xBaTiO3-yCaTiO3-zCaZrO3; and (2) x?BaTiO3-y?CaTiO3-z?CaZrO3, provided that x, y, z, x?, y?, and z? satisfy x+y+z=1, x?+y?+z?=1, 0?x??0.15, 0.85?y??1, 0?z?0.05, x>x?, 0<y<y?, and z>0.Type: ApplicationFiled: March 26, 2013Publication date: January 29, 2015Applicant: CANON KABUSHIKI KAISHAInventors: Mikio Shimada, Toshiaki Aiba, Toshihiro Ifuku, Takanori Matsuda, Makoto Kubota, Tatsuo Furuta, Jumpei Hayashi
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Publication number: 20140178290Abstract: Provided is a lead-free dielectric ceramics having a low leakage current value, and a bismuth iron oxide powder as a raw material thereof. The bismuth iron oxide powder includes at least: (A) grains including a bismuth iron oxide having a perovskite-type crystal structure; (B) grains including a bismuth iron oxide having a crystal structure classified to a space group Pbam; and (C) grains including a bismuth iron oxide or a bismuth oxide having a crystal structure that is classified to a space group I23. The dielectric ceramics are made of bismuth iron oxide in which the bismuth iron oxide crystals having the crystal structure classified to the space group Pbam are distributed at a grain boundary of crystal grains of the bismuth iron oxide crystals having the perovskite-type crystal structure.Type: ApplicationFiled: February 27, 2014Publication date: June 26, 2014Applicants: FUJI CHEMICAL CO., LTD., CANON KABUSHIKI KAISHAInventors: Hisato Yabuta, Makoto Kubota, Mikio Shimada, Kenji Takashima, Fumio Uchida, Kenji Maeda, Chiemi Shimizu
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Patent number: 8715855Abstract: A method of producing a material capable of electrochemically storing and releasing a large amount of lithium ions is provided. The material is used as an electrode material for a negative electrode, and includes silicon or tin primary particles composed of crystal particles each having a specific diameter and an amorphous surface layer formed of at least a metal oxide, having a specific thickness. Gibbs free energy when the metal oxide is produced by oxidation of a metal is smaller than Gibbs free energy when silicon or tin is oxidized, and the metal oxide has higher thermodynamic stability than silicon oxide or tin oxide. The method of producing the electrode material includes reacting silicon or tin with a metal oxide, reacting a silicon oxide or a tin oxide with a metal, or reacting a silicon compound or a tin compound with a metal compound to react with each other.Type: GrantFiled: August 31, 2012Date of Patent: May 6, 2014Assignee: Canon Kabushiki KaishaInventors: Soichiro Kawakami, Norishige Kakegawa, Akio Kashiwazaki, Toshiaki Aiba, Rie Ueno, Mikio Shimada, Kaoru Ojima, Takashi Noma